[patchset 0/33] scsi_data_buffer for after the last driver is converted

[patchset 0/33] scsi_data_buffer for after the last driver is converted

[Boaz Harrosh]

This is a resend of all the remaining drivers rebased
to latest code. And once the entire tree is converted,
move to scsi_data_buffer in scsi_cmnd.

The work is on top of Jens's for-linus branch which
is effectively sglist-arch (+ last minute fixes)
This is because sglist-arch was already rebased to
latest scsi-misc through linus tree, merged with 
the extra work done there on scsi-ml (and the drivers)
(Thanks Jens)

summery of patches:

left over from scsi_eh last change
  [PATCH 01/32] arm: fas216 Use scsi_eh API for REQUEST_SENSE invocation

lots and lots of drivers left:
  [PATCH 02/32] isd200.c: use one-element sg list in issuing commands
  [PATCH 03/32] usb: transport - convert to accessors and !use_sg code path removal
  [PATCH 04/32] usb: protocol.c - convert to accessors and !use_sg code path removal
  [PATCH 05/32] usb: shuttle_usbat.c - convert to accessors and !use_sg code path removal
  [PATCH 06/32] usb: freecom.c & sddr09.c - convert to accessors and !use_sg cleanup
  [PATCH 07/32] NCR5380 familly convert to accessors & !use_sg cleanup
  [PATCH 08/32] arm: scsi convert to accessors and !use_sg cleanup
  [PATCH 09/32] nsp_cs.c convert to data accessors and !use_sg cleanup
  [PATCH 10/32] eata_pio.c: convert to accessors and !use_sg cleanup
  [PATCH 11/32] a2091.c: convert to accessors and !use_sg cleanup
  [PATCH 12/32] a3000.c: convert to accessors and !use_sg cleanup
  [PATCH 13/32] aha1542.c: convert to accessors and !use_sg cleanup
  [PATCH 14/32] atp870u.c: convert to accessors and !use_sg cleanup
  [PATCH 15/32] fd_mcs.c: convert to accessors and !use_sg cleanup
  [PATCH 16/32] imm.c: convert to accessors and !use_sg cleanup
  [PATCH 17/32] ppa.c: convert to accessors and !use_sg cleanup
  [PATCH 18/32] wd32c93.c: convert to accessors and !use_sg cleanup
  [PATCH 19/32] qlogicpti.c: convert to accessors and !use_sg cleanup
  [PATCH 20/32] in2000.c: convert to accessors and !use_sg cleanup
  [PATCH 21/32] scsi_debug: convert to use the data buffer accessors

Tomo's patch cleaned up:
   [PATCH 22/32] qla1280: convert to use the data buffer accessors
   [PATCH 23/32] qla1280: Indentation fix

 I separated the indentation from the real change make
 the patch humanly readable.

A small fix:
  [PATCH 24/32] wd7000.c - proper fix for boards without sg support
  
Remove broken drivers:
  [PATCH 25/32] Remove psi240i driver from kernel
  [PATCH 26/32] Remove of seagate.c driver
  (pluto/fc was removed by Matthew.)

Move to scsi_data_buffer:

  [PATCH 27/32] scsi_data_buffer
  [PATCH 28/32] scsi_data_buffer - scsi_error.c
  [PATCH 29/32] scsi_data_buffer - sd.c and sr.c
  [PATCH 30/32] tgt: convert to use scsi_data_buffer
  [PATCH 31/32] tgt: convert ibmvstgt and libsrp to use scsi_data_buffer
  [PATCH 32/32] isd200.c - use of scsi_data_buffer

 It used to be that the tgt was broken between scsi_data_buffer patch
 and the patch to tgt, because of the API change to scsi_alloc/free_sgtable().
 I have added a shim in scsi_tgt_lib.c so it can compile and run. The shim is 
 later removed in the tgt patch.

 Did I miss any maintainers in the To: fields?

Boaz

[PATCH 1/32] arm: fas216 Use scsi_eh API for REQUEST_SENSE invocation

[Boaz Harrosh]

  - Use new scsi_eh_prep/restor_cmnd() for synchronous
    REQUEST_SENSE invocation.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/arm/fas216.c |   16 +++-------------
 drivers/scsi/arm/fas216.h |    3 +++
 2 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
index fb5f202..a715632 100644
--- a/drivers/scsi/arm/fas216.c
+++ b/drivers/scsi/arm/fas216.c
@@ -2018,6 +2018,7 @@ static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
 	 * the upper layers to process.  This would have been set
 	 * correctly by fas216_std_done.
 	 */
+	scsi_eh_restore_cmnd(SCpnt, &info->ses);
 	SCpnt->scsi_done(SCpnt);
 }
 
@@ -2103,23 +2104,12 @@ request_sense:
 	if (SCpnt->cmnd[0] == REQUEST_SENSE)
 		goto done;
 
+	scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
 	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
 			  "requesting sense");
-	memset(SCpnt->cmnd, 0, sizeof (SCpnt->cmnd));
-	SCpnt->cmnd[0] = REQUEST_SENSE;
-	SCpnt->cmnd[1] = SCpnt->device->lun << 5;
-	SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
-	SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
-	SCpnt->SCp.buffer = NULL;
-	SCpnt->SCp.buffers_residual = 0;
-	SCpnt->SCp.ptr = (char *)SCpnt->sense_buffer;
-	SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer);
-	SCpnt->SCp.phase = sizeof(SCpnt->sense_buffer);
+	init_SCp(SCpnt);
 	SCpnt->SCp.Message = 0;
 	SCpnt->SCp.Status = 0;
-	SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer);
-	SCpnt->sc_data_direction = DMA_FROM_DEVICE;
-	SCpnt->use_sg = 0;
 	SCpnt->tag = 0;
 	SCpnt->host_scribble = (void *)fas216_rq_sns_done;
 
diff --git a/drivers/scsi/arm/fas216.h b/drivers/scsi/arm/fas216.h
index 00e5f05..3e73e26 100644
--- a/drivers/scsi/arm/fas216.h
+++ b/drivers/scsi/arm/fas216.h
@@ -16,6 +16,8 @@
 #define NO_IRQ 255
 #endif
 
+#include <scsi/scsi_eh.h>
+
 #include "queue.h"
 #include "msgqueue.h"
 
@@ -311,6 +313,7 @@ typedef struct {
 
 	/* miscellaneous */
 	int			internal_done;		/* flag to indicate request done */
+	struct scsi_eh_save	*ses;		/* holds request sense restore info */
 	unsigned long		magic_end;
 } FAS216_Info;
 
-- 
1.5.3.1

[PATCH 2/32] isd200.c: use one-element sg list in issuing commands

[Boaz Harrosh]

  - This patch should be commited before:
    usb: transport - convert to accessors and !use_sg code path removal

  - isd200_action() was still using direct liniar pointers in issuing
    commands to the USB transport level. This is no longer supported,
    use one-element scatterlist instead.
  - Adjustment of command's length in the case of scsi-to-ata translation
    is now restored before return to queuecommand, since other wise it can
    leak BIOs.
  - isd200_action() return Error on unknown requests. Used to print an error
    but still try to send garbage cdb.
  - convert few places to scsi data accessors.
  - Todo: This file will need to be changed when scsi_cmnd changes to
    scsi_data_buffer or any other solution.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/usb/storage/isd200.c |   66 +++++++++++++++++++++++++++++------------
 1 files changed, 46 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c
index 6831dca..a624b4e 100644
--- a/drivers/usb/storage/isd200.c
+++ b/drivers/usb/storage/isd200.c
@@ -49,6 +49,7 @@
 #include <linux/slab.h>
 #include <linux/hdreg.h>
 #include <linux/ide.h>
+#include <linux/scatterlist.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -287,6 +288,7 @@ struct isd200_info {
 	/* maximum number of LUNs supported */
 	unsigned char MaxLUNs;
 	struct scsi_cmnd srb;
+	struct scatterlist sg;
 };
 
 
@@ -398,6 +400,31 @@ static void isd200_build_sense(struct us_data *us, struct scsi_cmnd *srb)
  * Transport routines
  ***********************************************************************/
 
+/**************************************************************************
+ *  isd200_set_srb(), isd200_srb_set_bufflen()
+ *
+ * Two helpers to facilitate in initialization of scsi_cmnd structure
+ * Will need to change when struct scsi_cmnd changes
+ */
+static void isd200_set_srb(struct isd200_info *info,
+	enum dma_data_direction dir, void* buff, unsigned bufflen)
+{
+	struct scsi_cmnd *srb = &info->srb;
+
+	if (buff)
+		sg_init_one(&info->sg, buff, bufflen);
+
+	srb->sc_data_direction = dir;
+	srb->request_buffer = buff ? &info->sg : NULL;
+	srb->request_bufflen = bufflen;
+	srb->use_sg = buff ? 1 : 0;
+}
+
+static void isd200_srb_set_bufflen(struct scsi_cmnd *srb, unsigned bufflen)
+{
+	srb->request_bufflen = bufflen;
+}
+
 
 /**************************************************************************
  *  isd200_action
@@ -432,9 +459,7 @@ static int isd200_action( struct us_data *us, int action,
 		ata.generic.RegisterSelect =
 		  REG_CYLINDER_LOW | REG_CYLINDER_HIGH |
 		  REG_STATUS | REG_ERROR;
-		srb->sc_data_direction = DMA_FROM_DEVICE;
-		srb->request_buffer = pointer;
-		srb->request_bufflen = value;
+		isd200_set_srb(info, DMA_FROM_DEVICE, pointer, value);
 		break;
 
 	case ACTION_ENUM:
@@ -444,7 +469,7 @@ static int isd200_action( struct us_data *us, int action,
 					   ACTION_SELECT_5;
 		ata.generic.RegisterSelect = REG_DEVICE_HEAD;
 		ata.write.DeviceHeadByte = value;
-		srb->sc_data_direction = DMA_NONE;
+		isd200_set_srb(info, DMA_NONE, NULL, 0);
 		break;
 
 	case ACTION_RESET:
@@ -453,7 +478,7 @@ static int isd200_action( struct us_data *us, int action,
 					   ACTION_SELECT_3|ACTION_SELECT_4;
 		ata.generic.RegisterSelect = REG_DEVICE_CONTROL;
 		ata.write.DeviceControlByte = ATA_DC_RESET_CONTROLLER;
-		srb->sc_data_direction = DMA_NONE;
+		isd200_set_srb(info, DMA_NONE, NULL, 0);
 		break;
 
 	case ACTION_REENABLE:
@@ -462,7 +487,7 @@ static int isd200_action( struct us_data *us, int action,
 					   ACTION_SELECT_3|ACTION_SELECT_4;
 		ata.generic.RegisterSelect = REG_DEVICE_CONTROL;
 		ata.write.DeviceControlByte = ATA_DC_REENABLE_CONTROLLER;
-		srb->sc_data_direction = DMA_NONE;
+		isd200_set_srb(info, DMA_NONE, NULL, 0);
 		break;
 
 	case ACTION_SOFT_RESET:
@@ -471,21 +496,20 @@ static int isd200_action( struct us_data *us, int action,
 		ata.generic.RegisterSelect = REG_DEVICE_HEAD | REG_COMMAND;
 		ata.write.DeviceHeadByte = info->DeviceHead;
 		ata.write.CommandByte = WIN_SRST;
-		srb->sc_data_direction = DMA_NONE;
+		isd200_set_srb(info, DMA_NONE, NULL, 0);
 		break;
 
 	case ACTION_IDENTIFY:
 		US_DEBUGP("   isd200_action(IDENTIFY)\n");
 		ata.generic.RegisterSelect = REG_COMMAND;
 		ata.write.CommandByte = WIN_IDENTIFY;
-		srb->sc_data_direction = DMA_FROM_DEVICE;
-		srb->request_buffer = (void *) info->id;
-		srb->request_bufflen = sizeof(struct hd_driveid);
+		isd200_set_srb(info, DMA_FROM_DEVICE, info->id,
+		                                sizeof(struct hd_driveid));
 		break;
 
 	default:
 		US_DEBUGP("Error: Undefined action %d\n",action);
-		break;
+		return ISD200_ERROR;
 	}
 
 	memcpy(srb->cmnd, &ata, sizeof(ata.generic));
@@ -590,7 +614,7 @@ static void isd200_invoke_transport( struct us_data *us,
 		return;
 	}
 
-	if ((srb->resid > 0) &&
+	if ((scsi_get_resid(srb) > 0) &&
 	    !((srb->cmnd[0] == REQUEST_SENSE) ||
 	      (srb->cmnd[0] == INQUIRY) ||
 	      (srb->cmnd[0] == MODE_SENSE) ||
@@ -1114,7 +1138,6 @@ static int isd200_get_inquiry_data( struct us_data *us )
 	return(retStatus);
 }
 
-
 /**************************************************************************
  * isd200_scsi_to_ata
  *									 
@@ -1163,7 +1186,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us,
 			ataCdb->generic.TransferBlockSize = 1;
 			ataCdb->generic.RegisterSelect = REG_COMMAND;
 			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
-			srb->request_bufflen = 0;
+			isd200_srb_set_bufflen(srb, 0);
 		} else {
 			US_DEBUGP("   Media Status not supported, just report okay\n");
 			srb->result = SAM_STAT_GOOD;
@@ -1181,7 +1204,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us,
 			ataCdb->generic.TransferBlockSize = 1;
 			ataCdb->generic.RegisterSelect = REG_COMMAND;
 			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
-			srb->request_bufflen = 0;
+			isd200_srb_set_bufflen(srb, 0);
 		} else {
 			US_DEBUGP("   Media Status not supported, just report okay\n");
 			srb->result = SAM_STAT_GOOD;
@@ -1287,7 +1310,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us,
 			ataCdb->generic.RegisterSelect = REG_COMMAND;
 			ataCdb->write.CommandByte = (srb->cmnd[4] & 0x1) ?
 				WIN_DOORLOCK : WIN_DOORUNLOCK;
-			srb->request_bufflen = 0;
+			isd200_srb_set_bufflen(srb, 0);
 		} else {
 			US_DEBUGP("   Not removeable media, just report okay\n");
 			srb->result = SAM_STAT_GOOD;
@@ -1313,7 +1336,7 @@ static int isd200_scsi_to_ata(struct scsi_cmnd *srb, struct us_data *us,
 			ataCdb->generic.TransferBlockSize = 1;
 			ataCdb->generic.RegisterSelect = REG_COMMAND;
 			ataCdb->write.CommandByte = ATA_COMMAND_GET_MEDIA_STATUS;
-			srb->request_bufflen = 0;
+			isd200_srb_set_bufflen(srb, 0);
 		} else {
 			US_DEBUGP("   Nothing to do, just report okay\n");
 			srb->result = SAM_STAT_GOOD;
@@ -1422,7 +1445,7 @@ int isd200_Initialization(struct us_data *us)
 
 void isd200_ata_command(struct scsi_cmnd *srb, struct us_data *us)
 {
-	int sendToTransport = 1;
+	int sendToTransport = 1, orig_bufflen;
 	union ata_cdb ataCdb;
 
 	/* Make sure driver was initialized */
@@ -1430,11 +1453,14 @@ void isd200_ata_command(struct scsi_cmnd *srb, struct us_data *us)
 	if (us->extra == NULL)
 		US_DEBUGP("ERROR Driver not initialized\n");
 
-	/* Convert command */
-	srb->resid = 0;
+	scsi_set_resid(srb, 0);
+	/* scsi_bufflen might change in protocol translation to ata */
+	orig_bufflen = scsi_bufflen(srb);
 	sendToTransport = isd200_scsi_to_ata(srb, us, &ataCdb);
 
 	/* send the command to the transport layer */
 	if (sendToTransport)
 		isd200_invoke_transport(us, srb, &ataCdb);
+
+	isd200_srb_set_bufflen(srb, orig_bufflen);
 }
-- 
1.5.3.1

[PATCH 3/32] usb: transport - convert to accessors and !use_sg code path removal

[Boaz Harrosh]

  - Use scsi data accessors and remove of !use_sg code path.
  - New usb_stor_bulk_srb() for use by drivers

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/usb/storage/transport.c |   44 +++++++++++++++++++++++---------------
 drivers/usb/storage/transport.h |    2 +
 2 files changed, 29 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c
index c646750..d3a84a2 100644
--- a/drivers/usb/storage/transport.c
+++ b/drivers/usb/storage/transport.c
@@ -459,6 +459,21 @@ static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe,
 }
 
 /*
+ * Common used function. Transfer a complete command
+ * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid
+ */
+int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
+		      struct scsi_cmnd* srb)
+{
+	int resid = scsi_get_resid(srb);
+	int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb),
+				      scsi_sg_count(srb), scsi_bufflen(srb),
+				      &resid);
+	scsi_set_resid(srb, resid);
+	return result;
+}
+
+/*
  * Transfer an entire SCSI command's worth of data payload over the bulk
  * pipe.
  *
@@ -508,7 +523,7 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
 	int result;
 
 	/* send the command to the transport layer */
-	srb->resid = 0;
+	scsi_set_resid(srb, 0);
 	result = us->transport(srb, us);
 
 	/* if the command gets aborted by the higher layers, we need to
@@ -568,7 +583,7 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
 	 * A short transfer on a command where we don't expect it
 	 * is unusual, but it doesn't mean we need to auto-sense.
 	 */
-	if ((srb->resid > 0) &&
+	if ((scsi_get_resid(srb) > 0) &&
 	    !((srb->cmnd[0] == REQUEST_SENSE) ||
 	      (srb->cmnd[0] == INQUIRY) ||
 	      (srb->cmnd[0] == MODE_SENSE) ||
@@ -593,7 +608,7 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
 			srb->cmd_len = 12;
 
 		/* issue the auto-sense command */
-		srb->resid = 0;
+		scsi_set_resid(srb, 0);
 		temp_result = us->transport(us->srb, us);
 
 		/* let's clean up right away */
@@ -649,7 +664,7 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
 
 	/* Did we transfer less than the minimum amount required? */
 	if (srb->result == SAM_STAT_GOOD &&
-			srb->request_bufflen - srb->resid < srb->underflow)
+			scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
 		srb->result = (DID_ERROR << 16) | (SUGGEST_RETRY << 24);
 
 	return;
@@ -708,7 +723,7 @@ void usb_stor_stop_transport(struct us_data *us)
 
 int usb_stor_CBI_transport(struct scsi_cmnd *srb, struct us_data *us)
 {
-	unsigned int transfer_length = srb->request_bufflen;
+	unsigned int transfer_length = scsi_bufflen(srb);
 	unsigned int pipe = 0;
 	int result;
 
@@ -737,9 +752,7 @@ int usb_stor_CBI_transport(struct scsi_cmnd *srb, struct us_data *us)
 	if (transfer_length) {
 		pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
 				us->recv_bulk_pipe : us->send_bulk_pipe;
-		result = usb_stor_bulk_transfer_sg(us, pipe,
-					srb->request_buffer, transfer_length,
-					srb->use_sg, &srb->resid);
+		result = usb_stor_bulk_srb(us, pipe, srb);
 		US_DEBUGP("CBI data stage result is 0x%x\n", result);
 
 		/* if we stalled the data transfer it means command failed */
@@ -808,7 +821,7 @@ int usb_stor_CBI_transport(struct scsi_cmnd *srb, struct us_data *us)
  */
 int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us)
 {
-	unsigned int transfer_length = srb->request_bufflen;
+	unsigned int transfer_length = scsi_bufflen(srb);
 	int result;
 
 	/* COMMAND STAGE */
@@ -836,9 +849,7 @@ int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us)
 	if (transfer_length) {
 		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
 				us->recv_bulk_pipe : us->send_bulk_pipe;
-		result = usb_stor_bulk_transfer_sg(us, pipe,
-					srb->request_buffer, transfer_length,
-					srb->use_sg, &srb->resid);
+		result = usb_stor_bulk_srb(us, pipe, srb);
 		US_DEBUGP("CB data stage result is 0x%x\n", result);
 
 		/* if we stalled the data transfer it means command failed */
@@ -904,7 +915,7 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
 {
 	struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
 	struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
-	unsigned int transfer_length = srb->request_bufflen;
+	unsigned int transfer_length = scsi_bufflen(srb);
 	unsigned int residue;
 	int result;
 	int fake_sense = 0;
@@ -955,9 +966,7 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
 	if (transfer_length) {
 		unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 
 				us->recv_bulk_pipe : us->send_bulk_pipe;
-		result = usb_stor_bulk_transfer_sg(us, pipe,
-					srb->request_buffer, transfer_length,
-					srb->use_sg, &srb->resid);
+		result = usb_stor_bulk_srb(us, pipe, srb);
 		US_DEBUGP("Bulk data transfer result 0x%x\n", result);
 		if (result == USB_STOR_XFER_ERROR)
 			return USB_STOR_TRANSPORT_ERROR;
@@ -1036,7 +1045,8 @@ int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
 	if (residue) {
 		if (!(us->flags & US_FL_IGNORE_RESIDUE)) {
 			residue = min(residue, transfer_length);
-			srb->resid = max(srb->resid, (int) residue);
+			scsi_set_resid(srb, max(scsi_get_resid(srb),
+			                                       (int) residue));
 		}
 	}
 
diff --git a/drivers/usb/storage/transport.h b/drivers/usb/storage/transport.h
index 633a715..ada7c2f 100644
--- a/drivers/usb/storage/transport.h
+++ b/drivers/usb/storage/transport.h
@@ -139,6 +139,8 @@ extern int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
 		void *buf, unsigned int length, unsigned int *act_len);
 extern int usb_stor_bulk_transfer_sg(struct us_data *us, unsigned int pipe,
 		void *buf, unsigned int length, int use_sg, int *residual);
+extern int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
+		struct scsi_cmnd* srb);
 
 extern int usb_stor_port_reset(struct us_data *us);
 #endif
-- 
1.5.3.1

[PATCH 4/32] usb: protocol.c - convert to accessors and !use_sg code path removal

[Boaz Harrosh]

 - Use scsi data accessors and remove of !use_sg code path

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/usb/storage/protocol.c |  126 +++++++++++++++++-----------------------
 1 files changed, 53 insertions(+), 73 deletions(-)

diff --git a/drivers/usb/storage/protocol.c b/drivers/usb/storage/protocol.c
index cc8f7c5..6a11caf 100644
--- a/drivers/usb/storage/protocol.c
+++ b/drivers/usb/storage/protocol.c
@@ -149,11 +149,7 @@ void usb_stor_transparent_scsi_command(struct scsi_cmnd *srb,
  ***********************************************************************/
 
 /* Copy a buffer of length buflen to/from the srb's transfer buffer.
- * (Note: for scatter-gather transfers (srb->use_sg > 0), srb->request_buffer
- * points to a list of s-g entries and we ignore srb->request_bufflen.
- * For non-scatter-gather transfers, srb->request_buffer points to the
- * transfer buffer itself and srb->request_bufflen is the buffer's length.)
- * Update the *index and *offset variables so that the next copy will
+ * Update the **sgptr and *offset variables so that the next copy will
  * pick up from where this one left off. */
 
 unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
@@ -162,80 +158,64 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
 {
 	unsigned int cnt;
 
-	/* If not using scatter-gather, just transfer the data directly.
-	 * Make certain it will fit in the available buffer space. */
-	if (srb->use_sg == 0) {
-		if (*offset >= srb->request_bufflen)
-			return 0;
-		cnt = min(buflen, srb->request_bufflen - *offset);
-		if (dir == TO_XFER_BUF)
-			memcpy((unsigned char *) srb->request_buffer + *offset,
-					buffer, cnt);
-		else
-			memcpy(buffer, (unsigned char *) srb->request_buffer +
-					*offset, cnt);
-		*offset += cnt;
-
-	/* Using scatter-gather.  We have to go through the list one entry
+	/* We have to go through the list one entry
 	 * at a time.  Each s-g entry contains some number of pages, and
 	 * each page has to be kmap()'ed separately.  If the page is already
 	 * in kernel-addressable memory then kmap() will return its address.
 	 * If the page is not directly accessible -- such as a user buffer
 	 * located in high memory -- then kmap() will map it to a temporary
 	 * position in the kernel's virtual address space. */
-	} else {
-		struct scatterlist *sg = *sgptr;
-
-		if (!sg)
-			sg = (struct scatterlist *) srb->request_buffer;
-
-		/* This loop handles a single s-g list entry, which may
-		 * include multiple pages.  Find the initial page structure
-		 * and the starting offset within the page, and update
-		 * the *offset and *index values for the next loop. */
-		cnt = 0;
-		while (cnt < buflen) {
-			struct page *page = sg->page +
-					((sg->offset + *offset) >> PAGE_SHIFT);
-			unsigned int poff =
-					(sg->offset + *offset) & (PAGE_SIZE-1);
-			unsigned int sglen = sg->length - *offset;
-
-			if (sglen > buflen - cnt) {
-
-				/* Transfer ends within this s-g entry */
-				sglen = buflen - cnt;
-				*offset += sglen;
-			} else {
-
-				/* Transfer continues to next s-g entry */
-				*offset = 0;
-				sg = sg_next(sg);
-			}
-
-			/* Transfer the data for all the pages in this
-			 * s-g entry.  For each page: call kmap(), do the
-			 * transfer, and call kunmap() immediately after. */
-			while (sglen > 0) {
-				unsigned int plen = min(sglen, (unsigned int)
-						PAGE_SIZE - poff);
-				unsigned char *ptr = kmap(page);
-
-				if (dir == TO_XFER_BUF)
-					memcpy(ptr + poff, buffer + cnt, plen);
-				else
-					memcpy(buffer + cnt, ptr + poff, plen);
-				kunmap(page);
-
-				/* Start at the beginning of the next page */
-				poff = 0;
-				++page;
-				cnt += plen;
-				sglen -= plen;
-			}
+	struct scatterlist *sg = *sgptr;
+
+	if (!sg)
+		sg = scsi_sglist(srb);
+
+	/* This loop handles a single s-g list entry, which may
+		* include multiple pages.  Find the initial page structure
+		* and the starting offset within the page, and update
+		* the *offset and **sgptr values for the next loop. */
+	cnt = 0;
+	while (cnt < buflen) {
+		struct page *page = sg->page +
+				((sg->offset + *offset) >> PAGE_SHIFT);
+		unsigned int poff =
+				(sg->offset + *offset) & (PAGE_SIZE-1);
+		unsigned int sglen = sg->length - *offset;
+
+		if (sglen > buflen - cnt) {
+
+			/* Transfer ends within this s-g entry */
+			sglen = buflen - cnt;
+			*offset += sglen;
+		} else {
+
+			/* Transfer continues to next s-g entry */
+			*offset = 0;
+			sg = sg_next(sg);
+		}
+
+		/* Transfer the data for all the pages in this
+			* s-g entry.  For each page: call kmap(), do the
+			* transfer, and call kunmap() immediately after. */
+		while (sglen > 0) {
+			unsigned int plen = min(sglen, (unsigned int)
+					PAGE_SIZE - poff);
+			unsigned char *ptr = kmap(page);
+
+			if (dir == TO_XFER_BUF)
+				memcpy(ptr + poff, buffer + cnt, plen);
+			else
+				memcpy(buffer + cnt, ptr + poff, plen);
+			kunmap(page);
+
+			/* Start at the beginning of the next page */
+			poff = 0;
+			++page;
+			cnt += plen;
+			sglen -= plen;
 		}
-		*sgptr = sg;
 	}
+	*sgptr = sg;
 
 	/* Return the amount actually transferred */
 	return cnt;
@@ -251,6 +231,6 @@ void usb_stor_set_xfer_buf(unsigned char *buffer,
 
 	usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
 			TO_XFER_BUF);
-	if (buflen < srb->request_bufflen)
-		srb->resid = srb->request_bufflen - buflen;
+	if (buflen < scsi_bufflen(srb))
+		scsi_set_resid(srb, scsi_bufflen(srb) - buflen);
 }
-- 
1.5.3.1

[PATCH 5/32] usb: shuttle_usbat.c - convert to accessors and !use_sg code path removal

[Boaz Harrosh]

 - functions that received char* but where passed scatterlist* mostly
   were changed to receive void*
 - Use scsi data accessors and remove of !use_sg code path

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/usb/storage/shuttle_usbat.c |   68 +++++++++++++---------------------
 1 files changed, 26 insertions(+), 42 deletions(-)

diff --git a/drivers/usb/storage/shuttle_usbat.c b/drivers/usb/storage/shuttle_usbat.c
index cb22a9a..570c125 100644
--- a/drivers/usb/storage/shuttle_usbat.c
+++ b/drivers/usb/storage/shuttle_usbat.c
@@ -130,7 +130,7 @@ static int usbat_write(struct us_data *us,
  * Convenience function to perform a bulk read
  */
 static int usbat_bulk_read(struct us_data *us,
-			   unsigned char *data,
+			   void* buf,
 			   unsigned int len,
 			   int use_sg)
 {
@@ -138,14 +138,14 @@ static int usbat_bulk_read(struct us_data *us,
 		return USB_STOR_XFER_GOOD;
 
 	US_DEBUGP("usbat_bulk_read: len = %d\n", len);
-	return usb_stor_bulk_transfer_sg(us, us->recv_bulk_pipe, data, len, use_sg, NULL);
+	return usb_stor_bulk_transfer_sg(us, us->recv_bulk_pipe, buf, len, use_sg, NULL);
 }
 
 /*
  * Convenience function to perform a bulk write
  */
 static int usbat_bulk_write(struct us_data *us,
-			    unsigned char *data,
+			    void* buf,
 			    unsigned int len,
 			    int use_sg)
 {
@@ -153,7 +153,7 @@ static int usbat_bulk_write(struct us_data *us,
 		return USB_STOR_XFER_GOOD;
 
 	US_DEBUGP("usbat_bulk_write:  len = %d\n", len);
-	return usb_stor_bulk_transfer_sg(us, us->send_bulk_pipe, data, len, use_sg, NULL);
+	return usb_stor_bulk_transfer_sg(us, us->send_bulk_pipe, buf, len, use_sg, NULL);
 }
 
 /*
@@ -314,7 +314,7 @@ static int usbat_wait_not_busy(struct us_data *us, int minutes)
  * Read block data from the data register
  */
 static int usbat_read_block(struct us_data *us,
-			    unsigned char *content,
+			    void* buf,
 			    unsigned short len,
 			    int use_sg)
 {
@@ -337,7 +337,7 @@ static int usbat_read_block(struct us_data *us,
 	if (result != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;
 
-	result = usbat_bulk_read(us, content, len, use_sg);
+	result = usbat_bulk_read(us, buf, len, use_sg);
 	return (result == USB_STOR_XFER_GOOD ?
 			USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
 }
@@ -347,7 +347,7 @@ static int usbat_read_block(struct us_data *us,
  */
 static int usbat_write_block(struct us_data *us,
 			     unsigned char access,
-			     unsigned char *content,
+			     void* buf,
 			     unsigned short len,
 			     int minutes,
 			     int use_sg)
@@ -372,7 +372,7 @@ static int usbat_write_block(struct us_data *us,
 	if (result != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;
 
-	result = usbat_bulk_write(us, content, len, use_sg);
+	result = usbat_bulk_write(us, buf, len, use_sg);
 	if (result != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_ERROR;
 
@@ -392,7 +392,7 @@ static int usbat_hp8200e_rw_block_test(struct us_data *us,
 				       unsigned char timeout,
 				       unsigned char qualifier,
 				       int direction,
-				       unsigned char *content,
+				       void *buf,
 				       unsigned short len,
 				       int use_sg,
 				       int minutes)
@@ -472,7 +472,7 @@ static int usbat_hp8200e_rw_block_test(struct us_data *us,
 		}
 
 		result = usb_stor_bulk_transfer_sg(us,
-			pipe, content, len, use_sg, NULL);
+			pipe, buf, len, use_sg, NULL);
 
 		/*
 		 * If we get a stall on the bulk download, we'll retry
@@ -606,7 +606,7 @@ static int usbat_multiple_write(struct us_data *us,
  * other related details) are defined beforehand with _set_shuttle_features().
  */
 static int usbat_read_blocks(struct us_data *us,
-			     unsigned char *buffer,
+			     void* buffer,
 			     int len,
 			     int use_sg)
 {
@@ -648,7 +648,7 @@ static int usbat_read_blocks(struct us_data *us,
  * other related details) are defined beforehand with _set_shuttle_features().
  */
 static int usbat_write_blocks(struct us_data *us,
-							  unsigned char *buffer,
+			      void* buffer,
 			      int len,
 			      int use_sg)
 {
@@ -1170,15 +1170,15 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
 	US_DEBUGP("handle_read10: transfersize %d\n",
 		srb->transfersize);
 
-	if (srb->request_bufflen < 0x10000) {
+	if (scsi_bufflen(srb) < 0x10000) {
 
 		result = usbat_hp8200e_rw_block_test(us, USBAT_ATA, 
 			registers, data, 19,
 			USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
 			(USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
 			DMA_FROM_DEVICE,
-			srb->request_buffer, 
-			srb->request_bufflen, srb->use_sg, 1);
+			scsi_sglist(srb),
+			scsi_bufflen(srb), scsi_sg_count(srb), 1);
 
 		return result;
 	}
@@ -1196,7 +1196,7 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
 		len <<= 16;
 		len |= data[7+7];
 		US_DEBUGP("handle_read10: GPCMD_READ_CD: len %d\n", len);
-		srb->transfersize = srb->request_bufflen/len;
+		srb->transfersize = scsi_bufflen(srb)/len;
 	}
 
 	if (!srb->transfersize)  {
@@ -1213,7 +1213,7 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
 
 	len = (65535/srb->transfersize) * srb->transfersize;
 	US_DEBUGP("Max read is %d bytes\n", len);
-	len = min(len, srb->request_bufflen);
+	len = min(len, scsi_bufflen(srb));
 	buffer = kmalloc(len, GFP_NOIO);
 	if (buffer == NULL) /* bloody hell! */
 		return USB_STOR_TRANSPORT_FAILED;
@@ -1222,10 +1222,10 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
 	sector |= short_pack(data[7+5], data[7+4]);
 	transferred = 0;
 
-	while (transferred != srb->request_bufflen) {
+	while (transferred != scsi_bufflen(srb)) {
 
-		if (len > srb->request_bufflen - transferred)
-			len = srb->request_bufflen - transferred;
+		if (len > scsi_bufflen(srb) - transferred)
+			len = scsi_bufflen(srb) - transferred;
 
 		data[3] = len&0xFF; 	  /* (cylL) = expected length (L) */
 		data[4] = (len>>8)&0xFF;  /* (cylH) = expected length (H) */
@@ -1261,7 +1261,7 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
 		transferred += len;
 		sector += len / srb->transfersize;
 
-	} /* while transferred != srb->request_bufflen */
+	} /* while transferred != scsi_bufflen(srb) */
 
 	kfree(buffer);
 	return result;
@@ -1429,9 +1429,8 @@ static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us)
 	unsigned char data[32];
 	unsigned int len;
 	int i;
-	char string[64];
 
-	len = srb->request_bufflen;
+	len = scsi_bufflen(srb);
 
 	/* Send A0 (ATA PACKET COMMAND).
 	   Note: I guess we're never going to get any of the ATA
@@ -1472,8 +1471,8 @@ static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us)
 			USBAT_ATA_DATA, USBAT_ATA_STATUS, 0xFD,
 			(USBAT_QUAL_FCQ | USBAT_QUAL_ALQ),
 			DMA_TO_DEVICE,
-			srb->request_buffer, 
-			len, srb->use_sg, 10);
+			scsi_sglist(srb),
+			len, scsi_sg_count(srb), 10);
 
 		if (result == USB_STOR_TRANSPORT_GOOD) {
 			transferred += len;
@@ -1540,23 +1539,8 @@ static int usbat_hp8200e_transport(struct scsi_cmnd *srb, struct us_data *us)
 			len = *status;
 
 
-		result = usbat_read_block(us, srb->request_buffer, len, srb->use_sg);
-
-		/* Debug-print the first 32 bytes of the transfer */
-
-		if (!srb->use_sg) {
-			string[0] = 0;
-			for (i=0; i<len && i<32; i++) {
-				sprintf(string+strlen(string), "%02X ",
-				  ((unsigned char *)srb->request_buffer)[i]);
-				if ((i%16)==15) {
-					US_DEBUGP("%s\n", string);
-					string[0] = 0;
-				}
-			}
-			if (string[0]!=0)
-				US_DEBUGP("%s\n", string);
-		}
+		result = usbat_read_block(us, scsi_sglist(srb), len,
+			                                   scsi_sg_count(srb));
 	}
 
 	return result;
-- 
1.5.3.1

[PATCH 6/32] usb: freecom.c & sddr09.c - convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - Use scsi data accessors and remove of !use_sg code path
 - This patch is dependent on cleanup patch to usb transport.c/h

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/usb/storage/freecom.c |   14 ++++++--------
 drivers/usb/storage/sddr09.c  |    9 +++------
 2 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/storage/freecom.c b/drivers/usb/storage/freecom.c
index 88aa59a..f5a4e8d 100644
--- a/drivers/usb/storage/freecom.c
+++ b/drivers/usb/storage/freecom.c
@@ -132,8 +132,7 @@ freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
 
 	/* Now transfer all of our blocks. */
 	US_DEBUGP("Start of read\n");
-	result = usb_stor_bulk_transfer_sg(us, ipipe, srb->request_buffer,
-			count, srb->use_sg, &srb->resid);
+	result = usb_stor_bulk_srb(us, ipipe, srb);
 	US_DEBUGP("freecom_readdata done!\n");
 
 	if (result > USB_STOR_XFER_SHORT)
@@ -166,8 +165,7 @@ freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
 
 	/* Now transfer all of our blocks. */
 	US_DEBUGP("Start of write\n");
-	result = usb_stor_bulk_transfer_sg(us, opipe, srb->request_buffer,
-			count, srb->use_sg, &srb->resid);
+	result = usb_stor_bulk_srb(us, opipe, srb);
 
 	US_DEBUGP("freecom_writedata done!\n");
 	if (result > USB_STOR_XFER_SHORT)
@@ -281,7 +279,7 @@ int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
 	 * and such will hang. */
 	US_DEBUGP("Device indicates that it has %d bytes available\n",
 			le16_to_cpu (fst->Count));
-	US_DEBUGP("SCSI requested %d\n", srb->request_bufflen);
+	US_DEBUGP("SCSI requested %d\n", scsi_bufflen(srb));
 
 	/* Find the length we desire to read. */
 	switch (srb->cmnd[0]) {
@@ -292,12 +290,12 @@ int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
 			length = le16_to_cpu(fst->Count);
 			break;
 		default:
- 			length = srb->request_bufflen;
+			length = scsi_bufflen(srb);
 	}
 
 	/* verify that this amount is legal */
-	if (length > srb->request_bufflen) {
-		length = srb->request_bufflen;
+	if (length > scsi_bufflen(srb)) {
+		length = scsi_bufflen(srb);
 		US_DEBUGP("Truncating request to match buffer length: %d\n", length);
 	}
 
diff --git a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c
index b12202c..8972b17 100644
--- a/drivers/usb/storage/sddr09.c
+++ b/drivers/usb/storage/sddr09.c
@@ -1623,7 +1623,7 @@ int sddr09_transport(struct scsi_cmnd *srb, struct us_data *us)
 		return USB_STOR_TRANSPORT_ERROR;
 	}
 
-	if (srb->request_bufflen == 0)
+	if (scsi_bufflen(srb) == 0)
 		return USB_STOR_TRANSPORT_GOOD;
 
 	if (srb->sc_data_direction == DMA_TO_DEVICE ||
@@ -1634,12 +1634,9 @@ int sddr09_transport(struct scsi_cmnd *srb, struct us_data *us)
 		US_DEBUGP("SDDR09: %s %d bytes\n",
 			  (srb->sc_data_direction == DMA_TO_DEVICE) ?
 			  "sending" : "receiving",
-			  srb->request_bufflen);
+			  scsi_bufflen(srb));
 
-		result = usb_stor_bulk_transfer_sg(us, pipe,
-					srb->request_buffer,
-					srb->request_bufflen,
-					srb->use_sg, &srb->resid);
+		result = usb_stor_bulk_srb(us, pipe, srb);
 
 		return (result == USB_STOR_XFER_GOOD ?
 			USB_STOR_TRANSPORT_GOOD : USB_STOR_TRANSPORT_ERROR);
-- 
1.5.3.1

[PATCH 7/32] NCR5380 familly convert to accessors & !use_sg cleanup

[Boaz Harrosh]

  - convert to accessors and !use_sg cleanup
  - FIXME: Not sg-chain ready look for ++cmd->SCp.buffer

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/NCR5380.c       |   14 +++++++-------
 drivers/scsi/atari_NCR5380.c |   22 +++++++++++-----------
 drivers/scsi/sun3_NCR5380.c  |   22 +++++++++++-----------
 3 files changed, 29 insertions(+), 29 deletions(-)

diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 988f0bc..47ee320 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -295,17 +295,17 @@ static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
 	 * various queues are valid.
 	 */
 
-	if (cmd->use_sg) {
-		cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
-		cmd->SCp.buffers_residual = cmd->use_sg - 1;
+	if (scsi_bufflen(cmd)) {
+		cmd->SCp.buffer = scsi_sglist(cmd);
+		cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 		cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
 			       cmd->SCp.buffer->offset;
 		cmd->SCp.this_residual = cmd->SCp.buffer->length;
 	} else {
 		cmd->SCp.buffer = NULL;
 		cmd->SCp.buffers_residual = 0;
-		cmd->SCp.ptr = (char *) cmd->request_buffer;
-		cmd->SCp.this_residual = cmd->request_bufflen;
+		cmd->SCp.ptr = NULL;
+		cmd->SCp.this_residual = 0;
 	}
 }
 
@@ -976,14 +976,14 @@ static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
 		case WRITE_6:
 		case WRITE_10:
 			hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
-			hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
+			hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
 			hostdata->pendingw++;
 			break;
 		case READ:
 		case READ_6:
 		case READ_10:
 			hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
-			hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
+			hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
 			hostdata->pendingr++;
 			break;
 	}
diff --git a/drivers/scsi/atari_NCR5380.c b/drivers/scsi/atari_NCR5380.c
index 52d0b87..062d8aa 100644
--- a/drivers/scsi/atari_NCR5380.c
+++ b/drivers/scsi/atari_NCR5380.c
@@ -512,9 +512,9 @@ static inline void initialize_SCp(Scsi_Cmnd *cmd)
 	 * various queues are valid.
 	 */
 
-	if (cmd->use_sg) {
-		cmd->SCp.buffer = (struct scatterlist *)cmd->request_buffer;
-		cmd->SCp.buffers_residual = cmd->use_sg - 1;
+	if (scsi_bufflen(cmd)) {
+		cmd->SCp.buffer = scsi_sglist(cmd);
+		cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 		cmd->SCp.ptr = (char *)page_address(cmd->SCp.buffer->page) +
 			       cmd->SCp.buffer->offset;
 		cmd->SCp.this_residual = cmd->SCp.buffer->length;
@@ -525,8 +525,8 @@ static inline void initialize_SCp(Scsi_Cmnd *cmd)
 	} else {
 		cmd->SCp.buffer = NULL;
 		cmd->SCp.buffers_residual = 0;
-		cmd->SCp.ptr = (char *)cmd->request_buffer;
-		cmd->SCp.this_residual = cmd->request_bufflen;
+		cmd->SCp.ptr = NULL;
+		cmd->SCp.this_residual = 0;
 	}
 }
 
@@ -938,21 +938,21 @@ static int NCR5380_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
 	}
 # endif
 # ifdef NCR5380_STAT_LIMIT
-	if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+	if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
 # endif
 		switch (cmd->cmnd[0]) {
 		case WRITE:
 		case WRITE_6:
 		case WRITE_10:
 			hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
-			hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
+			hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
 			hostdata->pendingw++;
 			break;
 		case READ:
 		case READ_6:
 		case READ_10:
 			hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
-			hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
+			hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
 			hostdata->pendingr++;
 			break;
 		}
@@ -1354,21 +1354,21 @@ static irqreturn_t NCR5380_intr(int irq, void *dev_id)
 static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
 {
 # ifdef NCR5380_STAT_LIMIT
-	if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+	if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
 # endif
 		switch (cmd->cmnd[0]) {
 		case WRITE:
 		case WRITE_6:
 		case WRITE_10:
 			hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
-			/*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
+			/*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
 			hostdata->pendingw--;
 			break;
 		case READ:
 		case READ_6:
 		case READ_10:
 			hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
-			/*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
+			/*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
 			hostdata->pendingr--;
 			break;
 		}
diff --git a/drivers/scsi/sun3_NCR5380.c b/drivers/scsi/sun3_NCR5380.c
index dc15a22..75cd3b0 100644
--- a/drivers/scsi/sun3_NCR5380.c
+++ b/drivers/scsi/sun3_NCR5380.c
@@ -516,9 +516,9 @@ static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
      * various queues are valid.
      */
 
-    if (cmd->use_sg) {
-	cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
-	cmd->SCp.buffers_residual = cmd->use_sg - 1;
+    if (scsi_bufflen(cmd)) {
+	cmd->SCp.buffer = scsi_sglist(cmd);
+	cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 	cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
 	cmd->SCp.this_residual = cmd->SCp.buffer->length;
 
@@ -529,8 +529,8 @@ static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
     } else {
 	cmd->SCp.buffer = NULL;
 	cmd->SCp.buffers_residual = 0;
-	cmd->SCp.ptr = (char *) cmd->request_buffer;
-	cmd->SCp.this_residual = cmd->request_bufflen;
+	cmd->SCp.ptr = NULL;
+	cmd->SCp.this_residual = 0;
     }
     
 }
@@ -936,7 +936,7 @@ static int NCR5380_queue_command(struct scsi_cmnd *cmd,
     }
 # endif
 # ifdef NCR5380_STAT_LIMIT
-    if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+    if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
 # endif
 	switch (cmd->cmnd[0])
 	{
@@ -944,14 +944,14 @@ static int NCR5380_queue_command(struct scsi_cmnd *cmd,
 	    case WRITE_6:
 	    case WRITE_10:
 		hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
-		hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
+		hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
 		hostdata->pendingw++;
 		break;
 	    case READ:
 	    case READ_6:
 	    case READ_10:
 		hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
-		hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
+		hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
 		hostdata->pendingr++;
 		break;
 	}
@@ -1346,7 +1346,7 @@ static void collect_stats(struct NCR5380_hostdata *hostdata,
 			  struct scsi_cmnd *cmd)
 {
 # ifdef NCR5380_STAT_LIMIT
-    if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+    if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
 # endif
 	switch (cmd->cmnd[0])
 	{
@@ -1354,14 +1354,14 @@ static void collect_stats(struct NCR5380_hostdata *hostdata,
 	    case WRITE_6:
 	    case WRITE_10:
 		hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
-		/*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
+		/*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
 		hostdata->pendingw--;
 		break;
 	    case READ:
 	    case READ_6:
 	    case READ_10:
 		hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
-		/*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
+		/*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
 		hostdata->pendingr--;
 		break;
 	}
-- 
1.5.3.1

[PATCH 8/32] arm: scsi convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/arm/acornscsi.c |   14 +++++++-------
 drivers/scsi/arm/scsi.h      |   34 +++++++++++-----------------------
 2 files changed, 18 insertions(+), 30 deletions(-)

diff --git a/drivers/scsi/arm/acornscsi.c b/drivers/scsi/arm/acornscsi.c
index eceacf6..3bedf24 100644
--- a/drivers/scsi/arm/acornscsi.c
+++ b/drivers/scsi/arm/acornscsi.c
@@ -1790,7 +1790,7 @@ int acornscsi_starttransfer(AS_Host *host)
 	return 0;
     }
 
-    residual = host->SCpnt->request_bufflen - host->scsi.SCp.scsi_xferred;
+    residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred;
 
     sbic_arm_write(host->scsi.io_port, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
     sbic_arm_writenext(host->scsi.io_port, residual >> 16);
@@ -2270,7 +2270,7 @@ intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
 	case 0x4b:			/* -> PHASE_STATUSIN				*/
 	case 0x8b:			/* -> PHASE_STATUSIN				*/
 	    /* DATA IN -> STATUS */
-	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
 					  acornscsi_sbic_xfcount(host);
 	    acornscsi_dma_stop(host);
 	    acornscsi_readstatusbyte(host);
@@ -2281,7 +2281,7 @@ intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
 	case 0x4e:			/* -> PHASE_MSGOUT				*/
 	case 0x8e:			/* -> PHASE_MSGOUT				*/
 	    /* DATA IN -> MESSAGE OUT */
-	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
 					  acornscsi_sbic_xfcount(host);
 	    acornscsi_dma_stop(host);
 	    acornscsi_sendmessage(host);
@@ -2291,7 +2291,7 @@ intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
 	case 0x4f:			/* message in					*/
 	case 0x8f:			/* message in					*/
 	    /* DATA IN -> MESSAGE IN */
-	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
 					  acornscsi_sbic_xfcount(host);
 	    acornscsi_dma_stop(host);
 	    acornscsi_message(host);	/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
@@ -2319,7 +2319,7 @@ intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
 	case 0x4b:			/* -> PHASE_STATUSIN				*/
 	case 0x8b:			/* -> PHASE_STATUSIN				*/
 	    /* DATA OUT -> STATUS */
-	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
 					  acornscsi_sbic_xfcount(host);
 	    acornscsi_dma_stop(host);
 	    acornscsi_dma_adjust(host);
@@ -2331,7 +2331,7 @@ intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
 	case 0x4e:			/* -> PHASE_MSGOUT				*/
 	case 0x8e:			/* -> PHASE_MSGOUT				*/
 	    /* DATA OUT -> MESSAGE OUT */
-	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
 					  acornscsi_sbic_xfcount(host);
 	    acornscsi_dma_stop(host);
 	    acornscsi_dma_adjust(host);
@@ -2342,7 +2342,7 @@ intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
 	case 0x4f:			/* message in					*/
 	case 0x8f:			/* message in					*/
 	    /* DATA OUT -> MESSAGE IN */
-	    host->scsi.SCp.scsi_xferred = host->SCpnt->request_bufflen -
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
 					  acornscsi_sbic_xfcount(host);
 	    acornscsi_dma_stop(host);
 	    acornscsi_dma_adjust(host);
diff --git a/drivers/scsi/arm/scsi.h b/drivers/scsi/arm/scsi.h
index 21ba571..95cfb21 100644
--- a/drivers/scsi/arm/scsi.h
+++ b/drivers/scsi/arm/scsi.h
@@ -70,48 +70,36 @@ static inline void init_SCp(struct scsi_cmnd *SCpnt)
 {
 	memset(&SCpnt->SCp, 0, sizeof(struct scsi_pointer));
 
-	if (SCpnt->use_sg) {
+	if (scsi_bufflen(SCpnt)) {
 		unsigned long len = 0;
 		int buf;
 
-		SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->request_buffer;
-		SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;
+		SCpnt->SCp.buffer = scsi_sglist(SCpnt);
+		SCpnt->SCp.buffers_residual = scsi_sg_count(SCpnt) - 1;
 		SCpnt->SCp.ptr = (char *)
 			 (page_address(SCpnt->SCp.buffer->page) +
 			  SCpnt->SCp.buffer->offset);
 		SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length;
-		SCpnt->SCp.phase = SCpnt->request_bufflen;
+		SCpnt->SCp.phase = scsi_bufflen(SCpnt);
 
 #ifdef BELT_AND_BRACES
 		/*
 		 * Calculate correct buffer length.  Some commands
-		 * come in with the wrong request_bufflen.
+		 * come in with the wrong scsi_bufflen.
 		 */
 		for (buf = 0; buf <= SCpnt->SCp.buffers_residual; buf++)
 			len += SCpnt->SCp.buffer[buf].length;
 
-		if (SCpnt->request_bufflen != len)
+		if (scsi_bufflen(SCpnt) != len) {
+			WARN_ON(1);
 			printk(KERN_WARNING "scsi%d.%c: bad request buffer "
 			       "length %d, should be %ld\n", SCpnt->device->host->host_no,
-			       '0' + SCpnt->device->id, SCpnt->request_bufflen, len);
-		SCpnt->request_bufflen = len;
+			       '0' + SCpnt->device->id, scsi_bufflen(SCpnt), len);
+		}
 #endif
 	} else {
-		SCpnt->SCp.ptr = (unsigned char *)SCpnt->request_buffer;
-		SCpnt->SCp.this_residual = SCpnt->request_bufflen;
-		SCpnt->SCp.phase = SCpnt->request_bufflen;
-	}
-
-	/*
-	 * If the upper SCSI layers pass a buffer, but zero length,
-	 * we aren't interested in the buffer pointer.
-	 */
-	if (SCpnt->SCp.this_residual == 0 && SCpnt->SCp.ptr) {
-#if 0 //def BELT_AND_BRACES
-		printk(KERN_WARNING "scsi%d.%c: zero length buffer passed for "
-		       "command ", SCpnt->host->host_no, '0' + SCpnt->target);
-		__scsi_print_command(SCpnt->cmnd);
-#endif
 		SCpnt->SCp.ptr = NULL;
+		SCpnt->SCp.this_residual = 0;
+		SCpnt->SCp.phase = 0;
 	}
 }
-- 
1.5.3.1

[PATCH 9/32] nsp_cs.c convert to data accessors and !use_sg cleanup

[Boaz Harrosh]

[PATCH 9/32] nsp_cs.c convert to data accessors and !use_sg cleanup

  - use scsi data accessors
  - cleanup !use_sg code paths
  - TODO: use next_sg() for Jens's sglist branch. Look for 2
    places with "SCp.buffer++"

 Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/pcmcia/nsp_cs.c |   54 ++++++++++++++++++++++++++---------------
 1 files changed, 34 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/pcmcia/nsp_cs.c b/drivers/scsi/pcmcia/nsp_cs.c
index a45d89b..5082ca3 100644
--- a/drivers/scsi/pcmcia/nsp_cs.c
+++ b/drivers/scsi/pcmcia/nsp_cs.c
@@ -135,6 +135,11 @@ static nsp_hw_data nsp_data_base; /* attach <-> detect glue */
 
 #define NSP_DEBUG_BUF_LEN		150
 
+static inline void nsp_inc_resid(struct scsi_cmnd *SCpnt, int residInc)
+{
+	scsi_set_resid(SCpnt, scsi_get_resid(SCpnt) + residInc);
+}
+
 static void nsp_cs_message(const char *func, int line, char *type, char *fmt, ...)
 {
 	va_list args;
@@ -192,8 +197,10 @@ static int nsp_queuecommand(struct scsi_cmnd *SCpnt,
 #endif
 	nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
 
-	nsp_dbg(NSP_DEBUG_QUEUECOMMAND, "SCpnt=0x%p target=%d lun=%d buff=0x%p bufflen=%d use_sg=%d",
-		   SCpnt, target, SCpnt->device->lun, SCpnt->request_buffer, SCpnt->request_bufflen, SCpnt->use_sg);
+	nsp_dbg(NSP_DEBUG_QUEUECOMMAND,
+		"SCpnt=0x%p target=%d lun=%d sglist=0x%p bufflen=%d sg_count=%d",
+		SCpnt, target, SCpnt->device->lun, scsi_sglist(SCpnt),
+		scsi_bufflen(SCpnt), scsi_sg_count(SCpnt));
 	//nsp_dbg(NSP_DEBUG_QUEUECOMMAND, "before CurrentSC=0x%p", data->CurrentSC);
 
 	SCpnt->scsi_done	= done;
@@ -225,7 +232,7 @@ static int nsp_queuecommand(struct scsi_cmnd *SCpnt,
 	SCpnt->SCp.have_data_in = IO_UNKNOWN;
 	SCpnt->SCp.sent_command = 0;
 	SCpnt->SCp.phase	= PH_UNDETERMINED;
-	SCpnt->resid	        = SCpnt->request_bufflen;
+	scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
 
 	/* setup scratch area
 	   SCp.ptr		: buffer pointer
@@ -233,14 +240,14 @@ static int nsp_queuecommand(struct scsi_cmnd *SCpnt,
 	   SCp.buffer		: next buffer
 	   SCp.buffers_residual : left buffers in list
 	   SCp.phase		: current state of the command */
-	if (SCpnt->use_sg) {
-		SCpnt->SCp.buffer	    = (struct scatterlist *) SCpnt->request_buffer;
+	if (scsi_bufflen(SCpnt)) {
+		SCpnt->SCp.buffer	    = scsi_sglist(SCpnt);
 		SCpnt->SCp.ptr		    = BUFFER_ADDR;
 		SCpnt->SCp.this_residual    = SCpnt->SCp.buffer->length;
-		SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1;
+		SCpnt->SCp.buffers_residual = scsi_sg_count(SCpnt) - 1;
 	} else {
-		SCpnt->SCp.ptr		    = (char *) SCpnt->request_buffer;
-		SCpnt->SCp.this_residual    = SCpnt->request_bufflen;
+		SCpnt->SCp.ptr		    = NULL;
+		SCpnt->SCp.this_residual    = 0;
 		SCpnt->SCp.buffer	    = NULL;
 		SCpnt->SCp.buffers_residual = 0;
 	}
@@ -721,7 +728,9 @@ static void nsp_pio_read(struct scsi_cmnd *SCpnt)
 	ocount = data->FifoCount;
 
 	nsp_dbg(NSP_DEBUG_DATA_IO, "in SCpnt=0x%p resid=%d ocount=%d ptr=0x%p this_residual=%d buffers=0x%p nbuf=%d",
-		SCpnt, SCpnt->resid, ocount, SCpnt->SCp.ptr, SCpnt->SCp.this_residual, SCpnt->SCp.buffer, SCpnt->SCp.buffers_residual);
+		SCpnt, scsi_get_resid(SCpnt), ocount, SCpnt->SCp.ptr,
+		SCpnt->SCp.this_residual, SCpnt->SCp.buffer,
+		SCpnt->SCp.buffers_residual);
 
 	time_out = 1000;
 
@@ -771,7 +780,7 @@ static void nsp_pio_read(struct scsi_cmnd *SCpnt)
 			return;
 		}
 
-		SCpnt->resid	       	 -= res;
+		nsp_inc_resid(SCpnt, -res);
 		SCpnt->SCp.ptr		 += res;
 		SCpnt->SCp.this_residual -= res;
 		ocount			 += res;
@@ -795,10 +804,12 @@ static void nsp_pio_read(struct scsi_cmnd *SCpnt)
 
 	if (time_out == 0) {
 		nsp_msg(KERN_DEBUG, "pio read timeout resid=%d this_residual=%d buffers_residual=%d",
-			SCpnt->resid, SCpnt->SCp.this_residual, SCpnt->SCp.buffers_residual);
+			scsi_get_resid(SCpnt), SCpnt->SCp.this_residual,
+			SCpnt->SCp.buffers_residual);
 	}
 	nsp_dbg(NSP_DEBUG_DATA_IO, "read ocount=0x%x", ocount);
-	nsp_dbg(NSP_DEBUG_DATA_IO, "r cmd=%d resid=0x%x\n", data->CmdId, SCpnt->resid);
+	nsp_dbg(NSP_DEBUG_DATA_IO, "r cmd=%d resid=0x%x\n", data->CmdId,
+	                                                scsi_get_resid(SCpnt));
 }
 
 /*
@@ -816,7 +827,9 @@ static void nsp_pio_write(struct scsi_cmnd *SCpnt)
 	ocount	 = data->FifoCount;
 
 	nsp_dbg(NSP_DEBUG_DATA_IO, "in fifocount=%d ptr=0x%p this_residual=%d buffers=0x%p nbuf=%d resid=0x%x",
-		data->FifoCount, SCpnt->SCp.ptr, SCpnt->SCp.this_residual, SCpnt->SCp.buffer, SCpnt->SCp.buffers_residual, SCpnt->resid);
+		data->FifoCount, SCpnt->SCp.ptr, SCpnt->SCp.this_residual,
+		SCpnt->SCp.buffer, SCpnt->SCp.buffers_residual,
+		scsi_get_resid(SCpnt));
 
 	time_out = 1000;
 
@@ -830,7 +843,7 @@ static void nsp_pio_write(struct scsi_cmnd *SCpnt)
 
 			nsp_dbg(NSP_DEBUG_DATA_IO, "phase changed stat=0x%x, res=%d\n", stat, res);
 			/* Put back pointer */
-			SCpnt->resid	       	 += res;
+			nsp_inc_resid(SCpnt, res);
 			SCpnt->SCp.ptr		 -= res;
 			SCpnt->SCp.this_residual += res;
 			ocount			 -= res;
@@ -866,7 +879,7 @@ static void nsp_pio_write(struct scsi_cmnd *SCpnt)
 			break;
 		}
 
-		SCpnt->resid	       	 -= res;
+		nsp_inc_resid(SCpnt, -res);
 		SCpnt->SCp.ptr		 += res;
 		SCpnt->SCp.this_residual -= res;
 		ocount			 += res;
@@ -886,10 +899,12 @@ static void nsp_pio_write(struct scsi_cmnd *SCpnt)
 	data->FifoCount = ocount;
 
 	if (time_out == 0) {
-		nsp_msg(KERN_DEBUG, "pio write timeout resid=0x%x", SCpnt->resid);
+		nsp_msg(KERN_DEBUG, "pio write timeout resid=0x%x",
+		                                        scsi_get_resid(SCpnt));
 	}
 	nsp_dbg(NSP_DEBUG_DATA_IO, "write ocount=0x%x", ocount);
-	nsp_dbg(NSP_DEBUG_DATA_IO, "w cmd=%d resid=0x%x\n", data->CmdId, SCpnt->resid);
+	nsp_dbg(NSP_DEBUG_DATA_IO, "w cmd=%d resid=0x%x\n", data->CmdId,
+	                                                scsi_get_resid(SCpnt));
 }
 #undef RFIFO_CRIT
 #undef WFIFO_CRIT
@@ -911,9 +926,8 @@ static int nsp_nexus(struct scsi_cmnd *SCpnt)
 	nsp_index_write(base, SYNCREG,	sync->SyncRegister);
 	nsp_index_write(base, ACKWIDTH, sync->AckWidth);
 
-	if (SCpnt->use_sg    == 0        ||
-	    SCpnt->resid % 4 != 0        ||
-	    SCpnt->resid     <= PAGE_SIZE ) {
+	if (scsi_get_resid(SCpnt) % 4 != 0 ||
+	    scsi_get_resid(SCpnt) <= PAGE_SIZE ) {
 		data->TransferMode = MODE_IO8;
 	} else if (nsp_burst_mode == BURST_MEM32) {
 		data->TransferMode = MODE_MEM32;
-- 
1.5.3.1

[PATCH 10/32] eata_pio.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/eata_pio.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/eata_pio.c b/drivers/scsi/eata_pio.c
index 96180bb..e6d5138 100644
--- a/drivers/scsi/eata_pio.c
+++ b/drivers/scsi/eata_pio.c
@@ -385,7 +385,7 @@ static int eata_pio_queue(struct scsi_cmnd *cmd,
 		cp->DataIn = 0;	/* Input mode  */
 
 	cp->Interpret = (cmd->device->id == hd->hostid);
-	cp->cp_datalen = cpu_to_be32(cmd->request_bufflen);
+	cp->cp_datalen = cpu_to_be32(scsi_bufflen(cmd));
 	cp->Auto_Req_Sen = 0;
 	cp->cp_reqDMA = 0;
 	cp->reqlen = 0;
@@ -402,14 +402,14 @@ static int eata_pio_queue(struct scsi_cmnd *cmd,
 	cp->cmd = cmd;
 	cmd->host_scribble = (char *) &hd->ccb[y];
 
-	if (cmd->use_sg == 0) {
+	if (!scsi_bufflen(cmd)) {
 		cmd->SCp.buffers_residual = 1;
-		cmd->SCp.ptr = cmd->request_buffer;
-		cmd->SCp.this_residual = cmd->request_bufflen;
+		cmd->SCp.ptr = NULL;
+		cmd->SCp.this_residual = 0;
 		cmd->SCp.buffer = NULL;
 	} else {
-		cmd->SCp.buffer = cmd->request_buffer;
-		cmd->SCp.buffers_residual = cmd->use_sg;
+		cmd->SCp.buffer = scsi_sglist(cmd);
+		cmd->SCp.buffers_residual = scsi_sg_count(cmd);
 		cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) + cmd->SCp.buffer->offset;
 		cmd->SCp.this_residual = cmd->SCp.buffer->length;
 	}
-- 
1.5.3.1

[PATCH 11/32] a2091.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/a2091.c |   36 +++++-------------------------------
 1 files changed, 5 insertions(+), 31 deletions(-)

diff --git a/drivers/scsi/a2091.c b/drivers/scsi/a2091.c
index b7c5385..23f27c9 100644
--- a/drivers/scsi/a2091.c
+++ b/drivers/scsi/a2091.c
@@ -73,18 +73,9 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 	}
 
 	if (!dir_in) {
-	    /* copy to bounce buffer for a write */
-	    if (cmd->use_sg)
-#if 0
-		panic ("scsi%ddma: incomplete s/g support",
-		       instance->host_no);
-#else
+		/* copy to bounce buffer for a write */
 		memcpy (HDATA(instance)->dma_bounce_buffer,
 			cmd->SCp.ptr, cmd->SCp.this_residual);
-#endif
-	    else
-		memcpy (HDATA(instance)->dma_bounce_buffer,
-			cmd->request_buffer, cmd->request_bufflen);
 	}
     }
 
@@ -144,30 +135,13 @@ static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 
     /* copy from a bounce buffer, if necessary */
     if (status && HDATA(instance)->dma_bounce_buffer) {
-	if (SCpnt && SCpnt->use_sg) {
-#if 0
-	    panic ("scsi%d: incomplete s/g support",
-		   instance->host_no);
-#else
-	    if( HDATA(instance)->dma_dir )
+	if( HDATA(instance)->dma_dir )
 		memcpy (SCpnt->SCp.ptr, 
 			HDATA(instance)->dma_bounce_buffer,
 			SCpnt->SCp.this_residual);
-	    kfree (HDATA(instance)->dma_bounce_buffer);
-	    HDATA(instance)->dma_bounce_buffer = NULL;
-	    HDATA(instance)->dma_bounce_len = 0;
-	    
-#endif
-	} else {
-	    if (HDATA(instance)->dma_dir && SCpnt)
-		memcpy (SCpnt->request_buffer,
-			HDATA(instance)->dma_bounce_buffer,
-			SCpnt->request_bufflen);
-
-	    kfree (HDATA(instance)->dma_bounce_buffer);
-	    HDATA(instance)->dma_bounce_buffer = NULL;
-	    HDATA(instance)->dma_bounce_len = 0;
-	}
+	kfree (HDATA(instance)->dma_bounce_buffer);
+	HDATA(instance)->dma_bounce_buffer = NULL;
+	HDATA(instance)->dma_bounce_len = 0;
     }
 }
 
-- 
1.5.3.1

[PATCH 12/32] a3000.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/a3000.c |   15 +++------------
 1 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/a3000.c b/drivers/scsi/a3000.c
index 796f1c4..d7255c8 100644
--- a/drivers/scsi/a3000.c
+++ b/drivers/scsi/a3000.c
@@ -70,12 +70,8 @@ static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 
 	if (!dir_in) {
 	    /* copy to bounce buffer for a write */
-	    if (cmd->use_sg) {
-		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
-			cmd->SCp.ptr, cmd->SCp.this_residual);
-	    } else
-		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
-			cmd->request_buffer, cmd->request_bufflen);
+	    memcpy (HDATA(a3000_host)->dma_bounce_buffer,
+		cmd->SCp.ptr, cmd->SCp.this_residual);
 	}
 
 	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
@@ -146,7 +142,7 @@ static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 
     /* copy from a bounce buffer, if necessary */
     if (status && HDATA(instance)->dma_bounce_buffer) {
-	if (SCpnt && SCpnt->use_sg) {
+	if (SCpnt) {
 	    if (HDATA(instance)->dma_dir && SCpnt)
 		memcpy (SCpnt->SCp.ptr,
 			HDATA(instance)->dma_bounce_buffer,
@@ -155,11 +151,6 @@ static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
 	    HDATA(instance)->dma_bounce_buffer = NULL;
 	    HDATA(instance)->dma_bounce_len = 0;
 	} else {
-	    if (HDATA(instance)->dma_dir && SCpnt)
-		memcpy (SCpnt->request_buffer,
-			HDATA(instance)->dma_bounce_buffer,
-			SCpnt->request_bufflen);
-
 	    kfree (HDATA(instance)->dma_bounce_buffer);
 	    HDATA(instance)->dma_bounce_buffer = NULL;
 	    HDATA(instance)->dma_bounce_len = 0;
-- 
1.5.3.1

[PATCH 13/32] aha1542.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/aha1542.c |   46 ++++++++++------------------------------------
 1 files changed, 10 insertions(+), 36 deletions(-)

diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c
index 961a188..3eab68f 100644
--- a/drivers/scsi/aha1542.c
+++ b/drivers/scsi/aha1542.c
@@ -51,15 +51,6 @@
 #define SCSI_BUF_PA(address)	isa_virt_to_bus(address)
 #define SCSI_SG_PA(sgent)	(isa_page_to_bus((sgent)->page) + (sgent)->offset)
 
-static void BAD_DMA(void *address, unsigned int length)
-{
-	printk(KERN_CRIT "buf vaddress %p paddress 0x%lx length %d\n",
-	       address,
-	       SCSI_BUF_PA(address),
-	       length);
-	panic("Buffer at physical address > 16Mb used for aha1542");
-}
-
 static void BAD_SG_DMA(Scsi_Cmnd * SCpnt,
 		       struct scatterlist *sgp,
 		       int nseg,
@@ -598,8 +589,7 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 	unchar target = SCpnt->device->id;
 	unchar lun = SCpnt->device->lun;
 	unsigned long flags;
-	void *buff = SCpnt->request_buffer;
-	int bufflen = SCpnt->request_bufflen;
+	int bufflen = scsi_bufflen(SCpnt);
 	int mbo;
 	struct mailbox *mb;
 	struct ccb *ccb;
@@ -690,43 +680,29 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 
 	memcpy(ccb[mbo].cdb, cmd, ccb[mbo].cdblen);
 
-	if (SCpnt->use_sg) {
+	if (bufflen) {
 		struct scatterlist *sg;
 		struct chain *cptr;
 #ifdef DEBUG
 		unsigned char *ptr;
 #endif
-		int i;
+		int i, sg_count = scsi_sg_count(SCpnt);
 		ccb[mbo].op = 2;	/* SCSI Initiator Command  w/scatter-gather */
-		SCpnt->host_scribble = kmalloc(512, GFP_KERNEL | GFP_DMA);
+		SCpnt->host_scribble = kmalloc(sizeof(*cptr)*sg_count,
+		                                         GFP_KERNEL | GFP_DMA);
 		cptr = (struct chain *) SCpnt->host_scribble;
 		if (cptr == NULL) {
 			/* free the claimed mailbox slot */
 			HOSTDATA(SCpnt->device->host)->SCint[mbo] = NULL;
 			return SCSI_MLQUEUE_HOST_BUSY;
 		}
-		scsi_for_each_sg(SCpnt, sg, SCpnt->use_sg, i) {
-			if (sg->length == 0 || SCpnt->use_sg > 16 ||
-			    (((int) sg->offset) & 1) || (sg->length & 1)) {
-				unsigned char *ptr;
-				printk(KERN_CRIT "Bad segment list supplied to aha1542.c (%d, %d)\n", SCpnt->use_sg, i);
-				scsi_for_each_sg(SCpnt, sg, SCpnt->use_sg, i) {
-					printk(KERN_CRIT "%d: %p %d\n", i,
-					       (page_address(sg->page) +
-						sg->offset), sg->length);
-				};
-				printk(KERN_CRIT "cptr %x: ", (unsigned int) cptr);
-				ptr = (unsigned char *) &cptr[i];
-				for (i = 0; i < 18; i++)
-					printk("%02x ", ptr[i]);
-				panic("Foooooooood fight!");
-			};
+		scsi_for_each_sg(SCpnt, sg, sg_count, i) {
 			any2scsi(cptr[i].dataptr, SCSI_SG_PA(sg));
 			if (SCSI_SG_PA(sg) + sg->length - 1 > ISA_DMA_THRESHOLD)
-				BAD_SG_DMA(SCpnt, sg, SCpnt->use_sg, i);
+				BAD_SG_DMA(SCpnt, scsi_sglist(SCpnt), sg_count, i);
 			any2scsi(cptr[i].datalen, sg->length);
 		};
-		any2scsi(ccb[mbo].datalen, SCpnt->use_sg * sizeof(struct chain));
+		any2scsi(ccb[mbo].datalen, sg_count * sizeof(struct chain));
 		any2scsi(ccb[mbo].dataptr, SCSI_BUF_PA(cptr));
 #ifdef DEBUG
 		printk("cptr %x: ", cptr);
@@ -737,10 +713,8 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 	} else {
 		ccb[mbo].op = 0;	/* SCSI Initiator Command */
 		SCpnt->host_scribble = NULL;
-		any2scsi(ccb[mbo].datalen, bufflen);
-		if (buff && SCSI_BUF_PA(buff + bufflen - 1) > ISA_DMA_THRESHOLD)
-			BAD_DMA(buff, bufflen);
-		any2scsi(ccb[mbo].dataptr, SCSI_BUF_PA(buff));
+		any2scsi(ccb[mbo].datalen, 0);
+		any2scsi(ccb[mbo].dataptr, 0);
 	};
 	ccb[mbo].idlun = (target & 7) << 5 | direction | (lun & 7);	/*SCSI Target Id */
 	ccb[mbo].rsalen = 16;
-- 
1.5.3.1

[PATCH 14/32] atp870u.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup
 - Probably not ready for sg-chaining

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/atp870u.c |  102 ++++++++----------------------------------------
 1 files changed, 17 insertions(+), 85 deletions(-)

diff --git a/drivers/scsi/atp870u.c b/drivers/scsi/atp870u.c
index fec58cc..db6de5e 100644
--- a/drivers/scsi/atp870u.c
+++ b/drivers/scsi/atp870u.c
@@ -471,18 +471,8 @@ go_42:
 			/*
 			 *	Complete the command
 			 */
-			if (workreq->use_sg) {
-				pci_unmap_sg(dev->pdev,
-					(struct scatterlist *)workreq->request_buffer,
-					workreq->use_sg,
-					workreq->sc_data_direction);
-			} else if (workreq->request_bufflen &&
-					workreq->sc_data_direction != DMA_NONE) {
-				pci_unmap_single(dev->pdev,
-					workreq->SCp.dma_handle,
-					workreq->request_bufflen,
-					workreq->sc_data_direction);
-			}			
+			scsi_dma_unmap(workreq);
+
 			spin_lock_irqsave(dev->host->host_lock, flags);
 			(*workreq->scsi_done) (workreq);
 #ifdef ED_DBGP
@@ -624,7 +614,7 @@ static int atp870u_queuecommand(struct scsi_cmnd * req_p,
 
 	c = scmd_channel(req_p);
 	req_p->sense_buffer[0]=0;
-	req_p->resid = 0;
+	scsi_set_resid(req_p, 0);
 	if (scmd_channel(req_p) > 1) {
 		req_p->result = 0x00040000;
 		done(req_p);
@@ -722,7 +712,6 @@ static void send_s870(struct atp_unit *dev,unsigned char c)
 	unsigned short int tmpcip, w;
 	unsigned long l, bttl = 0;
 	unsigned int workport;
-	struct scatterlist *sgpnt;
 	unsigned long  sg_count;
 
 	if (dev->in_snd[c] != 0) {
@@ -793,6 +782,8 @@ oktosend:
 	}
 	printk("\n");
 #endif	
+	l = scsi_bufflen(workreq);
+
 	if (dev->dev_id == ATP885_DEVID) {
 		j = inb(dev->baseport + 0x29) & 0xfe;
 		outb(j, dev->baseport + 0x29);
@@ -800,12 +791,11 @@ oktosend:
 	}
 	
 	if (workreq->cmnd[0] == READ_CAPACITY) {
-		if (workreq->request_bufflen > 8) {
-			workreq->request_bufflen = 0x08;
-		}
+		if (l > 8)
+			l = 8;
 	}
 	if (workreq->cmnd[0] == 0x00) {
-		workreq->request_bufflen = 0;
+		l = 0;
 	}
 
 	tmport = workport + 0x1b;
@@ -852,40 +842,8 @@ oktosend:
 #ifdef ED_DBGP	
 	printk("dev->id[%d][%d].devsp = %2x\n",c,target_id,dev->id[c][target_id].devsp);
 #endif
-	/*
-	 *	Figure out the transfer size
-	 */
-	if (workreq->use_sg) {
-#ifdef ED_DBGP
-		printk("Using SGL\n");
-#endif		
-		l = 0;
-		
-		sgpnt = (struct scatterlist *) workreq->request_buffer;
-		sg_count = pci_map_sg(dev->pdev, sgpnt, workreq->use_sg,
-	   			workreq->sc_data_direction);		
-		
-		for (i = 0; i < workreq->use_sg; i++) {
-			if (sgpnt[i].length == 0 || workreq->use_sg > ATP870U_SCATTER) {
-				panic("Foooooooood fight!");
-			}
-			l += sgpnt[i].length;
-		}
-#ifdef ED_DBGP		
-		printk( "send_s870: workreq->use_sg %d, sg_count %d l %8ld\n", workreq->use_sg, sg_count, l);
-#endif
-	} else if(workreq->request_bufflen && workreq->sc_data_direction != PCI_DMA_NONE) {
-#ifdef ED_DBGP
-		printk("Not using SGL\n");
-#endif					
-		workreq->SCp.dma_handle = pci_map_single(dev->pdev, workreq->request_buffer,
-				workreq->request_bufflen,
-				workreq->sc_data_direction);		
-		l = workreq->request_bufflen;
-#ifdef ED_DBGP		
-		printk( "send_s870: workreq->use_sg %d, l %8ld\n", workreq->use_sg, l);
-#endif
-	} else l = 0;
+
+	sg_count = scsi_dma_map(workreq);
 	/*
 	 *	Write transfer size
 	 */
@@ -938,16 +896,16 @@ oktosend:
 	 *	a linear chain.
 	 */
 
-	if (workreq->use_sg) {
-		sgpnt = (struct scatterlist *) workreq->request_buffer;
+	if (l) {
+		struct scatterlist *sgpnt;
 		i = 0;
-		for (j = 0; j < workreq->use_sg; j++) {
-			bttl = sg_dma_address(&sgpnt[j]);
-			l=sg_dma_len(&sgpnt[j]);
+		scsi_for_each_sg(workreq, sgpnt, sg_count, j) {
+			bttl = sg_dma_address(sgpnt);
+			l=sg_dma_len(sgpnt);
 #ifdef ED_DBGP		
-		printk("1. bttl %x, l %x\n",bttl, l);
+			printk("1. bttl %x, l %x\n",bttl, l);
 #endif			
-		while (l > 0x10000) {
+			while (l > 0x10000) {
 				(((u16 *) (prd))[i + 3]) = 0x0000;
 				(((u16 *) (prd))[i + 2]) = 0x0000;
 				(((u32 *) (prd))[i >> 1]) = cpu_to_le32(bttl);
@@ -965,32 +923,6 @@ oktosend:
 		printk("prd %4x %4x %4x %4x\n",(((unsigned short int *)prd)[0]),(((unsigned short int *)prd)[1]),(((unsigned short int *)prd)[2]),(((unsigned short int *)prd)[3]));
 		printk("2. bttl %x, l %x\n",bttl, l);
 #endif			
-	} else {
-		/*
-		 *	For a linear request write a chain of blocks
-		 */        
-		bttl = workreq->SCp.dma_handle;
-		l = workreq->request_bufflen;
-		i = 0;
-#ifdef ED_DBGP		
-		printk("3. bttl %x, l %x\n",bttl, l);
-#endif			
-		while (l > 0x10000) {
-				(((u16 *) (prd))[i + 3]) = 0x0000;
-				(((u16 *) (prd))[i + 2]) = 0x0000;
-				(((u32 *) (prd))[i >> 1]) = cpu_to_le32(bttl);
-				l -= 0x10000;
-				bttl += 0x10000;
-				i += 0x04;
-			}
-			(((u16 *) (prd))[i + 3]) = cpu_to_le16(0x8000);
-			(((u16 *) (prd))[i + 2]) = cpu_to_le16(l);
-			(((u32 *) (prd))[i >> 1]) = cpu_to_le32(bttl);		
-#ifdef ED_DBGP		
-		printk("prd %4x %4x %4x %4x\n",(((unsigned short int *)prd)[0]),(((unsigned short int *)prd)[1]),(((unsigned short int *)prd)[2]),(((unsigned short int *)prd)[3]));
-		printk("4. bttl %x, l %x\n",bttl, l);
-#endif			
-		
 	}
 	tmpcip += 4;
 #ifdef ED_DBGP		
-- 
1.5.3.1

[PATCH 15/32] fd_mcs.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup
 - Not ready for sg-chaining

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/fd_mcs.c |   36 +++++++++++-------------------------
 1 files changed, 11 insertions(+), 25 deletions(-)

diff --git a/drivers/scsi/fd_mcs.c b/drivers/scsi/fd_mcs.c
index 668569e..3a5df96 100644
--- a/drivers/scsi/fd_mcs.c
+++ b/drivers/scsi/fd_mcs.c
@@ -1017,24 +1017,6 @@ static irqreturn_t fd_mcs_intr(int irq, void *dev_id)
 		printk(" ** IN DONE %d ** ", current_SC->SCp.have_data_in);
 #endif
 
-#if ERRORS_ONLY
-		if (current_SC->cmnd[0] == REQUEST_SENSE && !current_SC->SCp.Status) {
-			if ((unsigned char) (*((char *) current_SC->request_buffer + 2)) & 0x0f) {
-				unsigned char key;
-				unsigned char code;
-				unsigned char qualifier;
-
-				key = (unsigned char) (*((char *) current_SC->request_buffer + 2)) & 0x0f;
-				code = (unsigned char) (*((char *) current_SC->request_buffer + 12));
-				qualifier = (unsigned char) (*((char *) current_SC->request_buffer + 13));
-
-				if (key != UNIT_ATTENTION && !(key == NOT_READY && code == 0x04 && (!qualifier || qualifier == 0x02 || qualifier == 0x01))
-				    && !(key == ILLEGAL_REQUEST && (code == 0x25 || code == 0x24 || !code)))
-
-					printk("fd_mcs: REQUEST SENSE " "Key = %x, Code = %x, Qualifier = %x\n", key, code, qualifier);
-			}
-		}
-#endif
 #if EVERY_ACCESS
 		printk("BEFORE MY_DONE. . .");
 #endif
@@ -1097,7 +1079,9 @@ static int fd_mcs_queue(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 		panic("fd_mcs: fd_mcs_queue() NOT REENTRANT!\n");
 	}
 #if EVERY_ACCESS
-	printk("queue: target = %d cmnd = 0x%02x pieces = %d size = %u\n", SCpnt->target, *(unsigned char *) SCpnt->cmnd, SCpnt->use_sg, SCpnt->request_bufflen);
+	printk("queue: target = %d cmnd = 0x%02x pieces = %d size = %u\n",
+		SCpnt->target, *(unsigned char *) SCpnt->cmnd,
+		scsi_sg_count(SCpnt), scsi_bufflen(SCpnt));
 #endif
 
 	fd_mcs_make_bus_idle(shpnt);
@@ -1107,14 +1091,14 @@ static int fd_mcs_queue(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
 
 	/* Initialize static data */
 
-	if (current_SC->use_sg) {
-		current_SC->SCp.buffer = (struct scatterlist *) current_SC->request_buffer;
+	if (scsi_bufflen(current_SC)) {
+		current_SC->SCp.buffer = scsi_sglist(current_SC);
 		current_SC->SCp.ptr = page_address(current_SC->SCp.buffer->page) + current_SC->SCp.buffer->offset;
 		current_SC->SCp.this_residual = current_SC->SCp.buffer->length;
-		current_SC->SCp.buffers_residual = current_SC->use_sg - 1;
+		current_SC->SCp.buffers_residual = scsi_sg_count(current_SC) - 1;
 	} else {
-		current_SC->SCp.ptr = (char *) current_SC->request_buffer;
-		current_SC->SCp.this_residual = current_SC->request_bufflen;
+		current_SC->SCp.ptr = NULL;
+		current_SC->SCp.this_residual = 0;
 		current_SC->SCp.buffer = NULL;
 		current_SC->SCp.buffers_residual = 0;
 	}
@@ -1166,7 +1150,9 @@ static void fd_mcs_print_info(Scsi_Cmnd * SCpnt)
 		break;
 	}
 
-	printk("(%d), target = %d cmnd = 0x%02x pieces = %d size = %u\n", SCpnt->SCp.phase, SCpnt->device->id, *(unsigned char *) SCpnt->cmnd, SCpnt->use_sg, SCpnt->request_bufflen);
+	printk("(%d), target = %d cmnd = 0x%02x pieces = %d size = %u\n",
+		SCpnt->SCp.phase, SCpnt->device->id, *(unsigned char *) SCpnt->cmnd,
+		scsi_sg_count(SCpnt), scsi_bufflen(SCpnt));
 	printk("sent_command = %d, have_data_in = %d, timeout = %d\n", SCpnt->SCp.sent_command, SCpnt->SCp.have_data_in, SCpnt->timeout);
 #if DEBUG_RACE
 	printk("in_interrupt_flag = %d\n", in_interrupt_flag);
-- 
1.5.3.1

[PATCH 16/32] imm.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup
 - Not ready for sg-chaining

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/imm.c |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/imm.c b/drivers/scsi/imm.c
index 74cdc1f..84bcc1d 100644
--- a/drivers/scsi/imm.c
+++ b/drivers/scsi/imm.c
@@ -839,21 +839,18 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd)
 
 		/* Phase 4 - Setup scatter/gather buffers */
 	case 4:
-		if (cmd->use_sg) {
-			/* if many buffers are available, start filling the first */
-			cmd->SCp.buffer =
-			    (struct scatterlist *) cmd->request_buffer;
+		if (scsi_bufflen(cmd)) {
+			cmd->SCp.buffer = scsi_sglist(cmd);
 			cmd->SCp.this_residual = cmd->SCp.buffer->length;
 			cmd->SCp.ptr =
 			    page_address(cmd->SCp.buffer->page) +
 			    cmd->SCp.buffer->offset;
 		} else {
-			/* else fill the only available buffer */
 			cmd->SCp.buffer = NULL;
-			cmd->SCp.this_residual = cmd->request_bufflen;
-			cmd->SCp.ptr = cmd->request_buffer;
+			cmd->SCp.this_residual = 0;
+			cmd->SCp.ptr = NULL;
 		}
-		cmd->SCp.buffers_residual = cmd->use_sg - 1;
+		cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 		cmd->SCp.phase++;
 		if (cmd->SCp.this_residual & 0x01)
 			cmd->SCp.this_residual++;
-- 
1.5.3.1

[PATCH 17/32] ppa.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

[PATCH 17/32] ppa.c: convert to accessors and !use_sg cleanup

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/ppa.c |   12 +++++-------
 1 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ppa.c b/drivers/scsi/ppa.c
index 67b6d76..f9fdc8a 100644
--- a/drivers/scsi/ppa.c
+++ b/drivers/scsi/ppa.c
@@ -752,19 +752,17 @@ static int ppa_engine(ppa_struct *dev, struct scsi_cmnd *cmd)
 		cmd->SCp.phase++;
 
 	case 4:		/* Phase 4 - Setup scatter/gather buffers */
-		if (cmd->use_sg) {
-			/* if many buffers are available, start filling the first */
-			cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
+		if (scsi_bufflen(cmd)) {
+			cmd->SCp.buffer = scsi_sglist(cmd);
 			cmd->SCp.this_residual = cmd->SCp.buffer->length;
 			cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
 			    cmd->SCp.buffer->offset;
 		} else {
-			/* else fill the only available buffer */
 			cmd->SCp.buffer = NULL;
-			cmd->SCp.this_residual = cmd->request_bufflen;
-			cmd->SCp.ptr = cmd->request_buffer;
+			cmd->SCp.this_residual = 0;
+			cmd->SCp.ptr = NULL;
 		}
-		cmd->SCp.buffers_residual = cmd->use_sg - 1;
+		cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 		cmd->SCp.phase++;
 
 	case 5:		/* Phase 5 - Data transfer stage */
-- 
1.5.3.1

[PATCH 18/32] wd33c93.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/wd33c93.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c
index 0e8e642..1a772b8 100644
--- a/drivers/scsi/wd33c93.c
+++ b/drivers/scsi/wd33c93.c
@@ -407,17 +407,17 @@ wd33c93_queuecommand(struct scsi_cmnd *cmd,
  *  - SCp.phase records this command's SRCID_ER bit setting
  */
 
-	if (cmd->use_sg) {
-		cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
-		cmd->SCp.buffers_residual = cmd->use_sg - 1;
+	if (scsi_bufflen(cmd)) {
+		cmd->SCp.buffer = scsi_sglist(cmd);
+		cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 		cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
 		    cmd->SCp.buffer->offset;
 		cmd->SCp.this_residual = cmd->SCp.buffer->length;
 	} else {
 		cmd->SCp.buffer = NULL;
 		cmd->SCp.buffers_residual = 0;
-		cmd->SCp.ptr = (char *) cmd->request_buffer;
-		cmd->SCp.this_residual = cmd->request_bufflen;
+		cmd->SCp.ptr = NULL;
+		cmd->SCp.this_residual = 0;
 	}
 
 /* WD docs state that at the conclusion of a "LEVEL2" command, the
-- 
1.5.3.1

[PATCH 19/32] qlogicpti.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/qlogicpti.c |   29 +++++++----------------------
 1 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index 7a2e798..5bc8831 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -871,11 +871,12 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
 	struct scatterlist *sg, *s;
 	int i, n;
 
-	if (Cmnd->use_sg) {
+	if (scsi_bufflen(Cmnd)) {
 		int sg_count;
 
-		sg = (struct scatterlist *) Cmnd->request_buffer;
-		sg_count = sbus_map_sg(qpti->sdev, sg, Cmnd->use_sg, Cmnd->sc_data_direction);
+		sg = scsi_sglist(Cmnd);
+		sg_count = sbus_map_sg(qpti->sdev, sg, scsi_sg_count(Cmnd),
+		                                      Cmnd->sc_data_direction);
 
 		ds = cmd->dataseg;
 		cmd->segment_cnt = sg_count;
@@ -914,16 +915,6 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
 			}
 			sg_count -= n;
 		}
-	} else if (Cmnd->request_bufflen) {
-		Cmnd->SCp.ptr = (char *)(unsigned long)
-			sbus_map_single(qpti->sdev,
-					Cmnd->request_buffer,
-					Cmnd->request_bufflen,
-					Cmnd->sc_data_direction);
-
-		cmd->dataseg[0].d_base = (u32) ((unsigned long)Cmnd->SCp.ptr);
-		cmd->dataseg[0].d_count = Cmnd->request_bufflen;
-		cmd->segment_cnt = 1;
 	} else {
 		cmd->dataseg[0].d_base = 0;
 		cmd->dataseg[0].d_count = 0;
@@ -1159,17 +1150,11 @@ static struct scsi_cmnd *qlogicpti_intr_handler(struct qlogicpti *qpti)
 		else
 			Cmnd->result = DID_ERROR << 16;
 
-		if (Cmnd->use_sg) {
+		if (scsi_bufflen(Cmnd))
 			sbus_unmap_sg(qpti->sdev,
-				      (struct scatterlist *)Cmnd->request_buffer,
-				      Cmnd->use_sg,
+				      scsi_sglist(Cmnd), scsi_sg_count(Cmnd),
 				      Cmnd->sc_data_direction);
-		} else if (Cmnd->request_bufflen) {
-			sbus_unmap_single(qpti->sdev,
-					  (__u32)((unsigned long)Cmnd->SCp.ptr),
-					  Cmnd->request_bufflen,
-					  Cmnd->sc_data_direction);
-		}
+
 		qpti->cmd_count[Cmnd->device->id]--;
 		sbus_writew(out_ptr, qpti->qregs + MBOX5);
 		Cmnd->host_scribble = (unsigned char *) done_queue;
-- 
1.5.3.1

[PATCH 20/32] in2000.c: convert to accessors and !use_sg cleanup

[Boaz Harrosh]

 - convert to accessors and !use_sg cleanup

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/in2000.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/in2000.c b/drivers/scsi/in2000.c
index ab7cbf3..ced38de 100644
--- a/drivers/scsi/in2000.c
+++ b/drivers/scsi/in2000.c
@@ -369,16 +369,16 @@ static int in2000_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
  *  - SCp.phase records this command's SRCID_ER bit setting
  */
 
-	if (cmd->use_sg) {
-		cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer;
-		cmd->SCp.buffers_residual = cmd->use_sg - 1;
+	if (scsi_bufflen(cmd)) {
+		cmd->SCp.buffer = scsi_sglist(cmd);
+		cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 		cmd->SCp.ptr = (char *) page_address(cmd->SCp.buffer->page) + cmd->SCp.buffer->offset;
 		cmd->SCp.this_residual = cmd->SCp.buffer->length;
 	} else {
 		cmd->SCp.buffer = NULL;
 		cmd->SCp.buffers_residual = 0;
-		cmd->SCp.ptr = (char *) cmd->request_buffer;
-		cmd->SCp.this_residual = cmd->request_bufflen;
+		cmd->SCp.ptr = NULL;
+		cmd->SCp.this_residual = 0;
 	}
 	cmd->SCp.have_data_in = 0;
 
-- 
1.5.3.1

[PATCH 21/32] qla1280: convert to use the data buffer accessors

[Boaz Harrosh]

From: FUJITA Tomonori <tomof@acm.org>

  - remove the unnecessary map_single path.
  - convert to use the new accessors for the sg lists and the parameters.
  - NOTE: Indentation fix is in next patch. Otherwise this patch
    becomes totally impossible to read (and easily breakable)

Signed-off-by: FUJITA Tomonori <tomof@acm.org>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/qla1280.c |  101 +++++++++---------------------------------------
 1 files changed, 19 insertions(+), 82 deletions(-)

diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 76089cf..7a18b1a 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -1310,14 +1310,7 @@ qla1280_done(struct scsi_qla_host *ha)
 		}
 
 		/* Release memory used for this I/O */
-		if (cmd->use_sg) {
-			pci_unmap_sg(ha->pdev, cmd->request_buffer,
-					cmd->use_sg, cmd->sc_data_direction);
-		} else if (cmd->request_bufflen) {
-			pci_unmap_single(ha->pdev, sp->saved_dma_handle,
-					cmd->request_bufflen,
-					cmd->sc_data_direction);
-		}
+		scsi_dma_unmap(cmd);
 
 		/* Call the mid-level driver interrupt handler */
 		CMD_HANDLE(sp->cmd) = (unsigned char *)INVALID_HANDLE;
@@ -1406,14 +1399,14 @@ qla1280_return_status(struct response * sts, struct scsi_cmnd *cp)
 		break;
 
 	case CS_DATA_UNDERRUN:
-		if ((cp->request_bufflen - residual_length) <
+		if ((scsi_bufflen(cp) - residual_length) <
 		    cp->underflow) {
 			printk(KERN_WARNING
 			       "scsi: Underflow detected - retrying "
 			       "command.\n");
 			host_status = DID_ERROR;
 		} else {
-			cp->resid = residual_length;
+			scsi_set_resid(cp, residual_length);
 			host_status = DID_OK;
 		}
 		break;
@@ -2781,27 +2774,23 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 	int status = 0;
 	int cnt;
 	int req_cnt;
-	u16 seg_cnt;
+	int seg_cnt;
 	u8 dir;
 
 	ENTER("qla1280_64bit_start_scsi:");
 
 	/* Calculate number of entries and segments required. */
 	req_cnt = 1;
-	if (cmd->use_sg) {
-		sg = (struct scatterlist *) cmd->request_buffer;
-		seg_cnt = pci_map_sg(ha->pdev, sg, cmd->use_sg,
-				     cmd->sc_data_direction);
-
+	seg_cnt = scsi_dma_map(cmd);
+	if (seg_cnt > 0) {
 		if (seg_cnt > 2) {
 			req_cnt += (seg_cnt - 2) / 5;
 			if ((seg_cnt - 2) % 5)
 				req_cnt++;
 		}
-	} else if (cmd->request_bufflen) {	/* If data transfer. */
-		seg_cnt = 1;
-	} else {
-		seg_cnt = 0;
+	} else if (seg_cnt < 0) {
+		status = 1;
+		goto out;
 	}
 
 	if ((req_cnt + 2) >= ha->req_q_cnt) {
@@ -2893,7 +2882,7 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 		/* Setup packet address segment pointer. */
 		dword_ptr = (u32 *)&pkt->dseg_0_address;
 
-		if (cmd->use_sg) {	/* If scatter gather */
+		{	/* FIXME:Indentation in next patch */
 			/* Load command entry data segments. */
 			for_each_sg(sg, s, seg_cnt, cnt) {
 				if (cnt == 2)
@@ -2986,29 +2975,6 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 				qla1280_dump_buffer(5, (char *)pkt,
 						    REQUEST_ENTRY_SIZE);
 			}
-		} else {	/* No scatter gather data transfer */
-			dma_handle = pci_map_single(ha->pdev,
-					cmd->request_buffer,
-					cmd->request_bufflen,
-					cmd->sc_data_direction);
-
-			sp->saved_dma_handle = dma_handle;
-#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
-			if (ha->flags.use_pci_vchannel)
-				sn_pci_set_vchan(ha->pdev, 
-						(unsigned long *)&dma_handle,
-						 SCSI_BUS_32(cmd));
-#endif
-			*dword_ptr++ = cpu_to_le32(pci_dma_lo32(dma_handle));
-			*dword_ptr++ = cpu_to_le32(pci_dma_hi32(dma_handle));
-			*dword_ptr = cpu_to_le32(cmd->request_bufflen);
-
-			dprintk(5, "qla1280_64bit_start_scsi: No scatter/"
-				"gather command packet data - b %i, t %i, "
-				"l %i \n", SCSI_BUS_32(cmd), SCSI_TCN_32(cmd),
-				SCSI_LUN_32(cmd));
-			qla1280_dump_buffer(5, (char *)pkt,
-					    REQUEST_ENTRY_SIZE);
 		}
 	} else {	/* No data transfer */
 		dprintk(5, "qla1280_64bit_start_scsi: No data, command "
@@ -3073,7 +3039,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 	int status = 0;
 	int cnt;
 	int req_cnt;
-	uint16_t seg_cnt;
+	int seg_cnt;
 	dma_addr_t dma_handle;
 	u8 dir;
 
@@ -3084,17 +3050,8 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 
 	/* Calculate number of entries and segments required. */
 	req_cnt = 1;
-	if (cmd->use_sg) {
-		/*
-		 * We must build an SG list in adapter format, as the kernel's
-		 * SG list cannot be used directly because of data field size
-		 * (__alpha__) differences and the kernel SG list uses virtual
-		 * addresses where we need physical addresses.
-		 */
-		sg = (struct scatterlist *) cmd->request_buffer;
-		seg_cnt = pci_map_sg(ha->pdev, sg, cmd->use_sg,
-				     cmd->sc_data_direction);
-
+	seg_cnt = scsi_dma_map(cmd);
+	if (seg_cnt > 0) {
 		/*
 		 * if greater than four sg entries then we need to allocate
 		 * continuation entries
@@ -3106,14 +3063,9 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 		}
 		dprintk(3, "S/G Transfer cmd=%p seg_cnt=0x%x, req_cnt=%x\n",
 			cmd, seg_cnt, req_cnt);
-	} else if (cmd->request_bufflen) {	/* If data transfer. */
-		dprintk(3, "No S/G transfer t=%x cmd=%p len=%x CDB=%x\n",
-			SCSI_TCN_32(cmd), cmd, cmd->request_bufflen,
-			cmd->cmnd[0]);
-		seg_cnt = 1;
-	} else {
-		/* dprintk(1, "No data transfer \n"); */
-		seg_cnt = 0;
+	} else if (seg_cnt < 0) {
+		status = 1;
+		goto out;
 	}
 
 	if ((req_cnt + 2) >= ha->req_q_cnt) {
@@ -3198,7 +3150,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 		/* Setup packet address segment pointer. */
 		dword_ptr = &pkt->dseg_0_address;
 
-		if (cmd->use_sg) {	/* If scatter gather */
+		{	/* FIXME:Indentation in next patch */
 			dprintk(3, "Building S/G data segments..\n");
 			qla1280_dump_buffer(1, (char *)sg, 4 * 16);
 
@@ -3270,15 +3222,6 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 				qla1280_dump_buffer(5, (char *)pkt,
 						    REQUEST_ENTRY_SIZE);
 			}
-		} else {	/* No S/G data transfer */
-			dma_handle = pci_map_single(ha->pdev,
-					cmd->request_buffer,
-					cmd->request_bufflen,
-					cmd->sc_data_direction);
-			sp->saved_dma_handle = dma_handle;
-
-			*dword_ptr++ = cpu_to_le32(pci_dma_lo32(dma_handle));
-			*dword_ptr = cpu_to_le32(cmd->request_bufflen);
 		}
 	} else {	/* No data transfer at all */
 		dprintk(5, "qla1280_32bit_start_scsi: No data, command "
@@ -4086,15 +4029,9 @@ __qla1280_print_scsi_cmd(struct scsi_cmnd *cmd)
 	for (i = 0; i < cmd->cmd_len; i++) {
 		printk("0x%02x ", cmd->cmnd[i]);
 	}
-	printk("  seg_cnt =%d\n", cmd->use_sg);
+	printk("  seg_cnt =%d\n", scsi_sg_count(cmd));
 	printk("  request buffer=0x%p, request buffer len=0x%x\n",
-	       cmd->request_buffer, cmd->request_bufflen);
-	/* if (cmd->use_sg)
-	   {
-	   sg = (struct scatterlist *) cmd->request_buffer;
-	   printk("  SG buffer: \n");
-	   qla1280_dump_buffer(1, (char *)sg, (cmd->use_sg*sizeof(struct scatterlist)));
-	   } */
+	       scsi_sglist(cmd), scsi_bufflen(cmd));
 	printk("  tag=%d, transfersize=0x%x \n",
 	       cmd->tag, cmd->transfersize);
 	printk("  Pid=%li, SP=0x%p\n", cmd->serial_number, CMD_SP(cmd));
-- 
1.5.3.1

[PATCH 22/32] qla1280: Indentation fix

[Boaz Harrosh]

  - Indentation fix of last patch. Don't be fooled by diff,
    all I did was back-indent from open-bracket to close-bracket,
    and remove the brackets.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/qla1280.c |  290 ++++++++++++++++++++++++------------------------
 1 files changed, 143 insertions(+), 147 deletions(-)

diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 7a18b1a..bf07b17 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2882,99 +2882,97 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 		/* Setup packet address segment pointer. */
 		dword_ptr = (u32 *)&pkt->dseg_0_address;
 
-		{	/* FIXME:Indentation in next patch */
-			/* Load command entry data segments. */
-			for_each_sg(sg, s, seg_cnt, cnt) {
-				if (cnt == 2)
+		/* Load command entry data segments. */
+		for_each_sg(sg, s, seg_cnt, cnt) {
+			if (cnt == 2)
+				break;
+			dma_handle = sg_dma_address(s);
+#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
+			if (ha->flags.use_pci_vchannel)
+				sn_pci_set_vchan(ha->pdev,
+						(unsigned long *)&dma_handle,
+						 SCSI_BUS_32(cmd));
+#endif
+			*dword_ptr++ =
+				cpu_to_le32(pci_dma_lo32(dma_handle));
+			*dword_ptr++ =
+				cpu_to_le32(pci_dma_hi32(dma_handle));
+			*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
+			dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
+				cpu_to_le32(pci_dma_hi32(dma_handle)),
+				cpu_to_le32(pci_dma_lo32(dma_handle)),
+				cpu_to_le32(sg_dma_len(sg_next(s))));
+			remseg--;
+		}
+		dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
+			"command packet data - b %i, t %i, l %i \n",
+			SCSI_BUS_32(cmd), SCSI_TCN_32(cmd),
+			SCSI_LUN_32(cmd));
+		qla1280_dump_buffer(5, (char *)pkt,
+				    REQUEST_ENTRY_SIZE);
+
+		/*
+		 * Build continuation packets.
+		 */
+		dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
+			"remains\n", seg_cnt);
+
+		while (remseg > 0) {
+			/* Update sg start */
+			sg = s;
+			/* Adjust ring index. */
+			ha->req_ring_index++;
+			if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
+				ha->req_ring_index = 0;
+				ha->request_ring_ptr =
+					ha->request_ring;
+			} else
+					ha->request_ring_ptr++;
+
+			pkt = (cmd_a64_entry_t *)ha->request_ring_ptr;
+
+			/* Zero out packet. */
+			memset(pkt, 0, REQUEST_ENTRY_SIZE);
+
+			/* Load packet defaults. */
+			((struct cont_a64_entry *) pkt)->entry_type =
+				CONTINUE_A64_TYPE;
+			((struct cont_a64_entry *) pkt)->entry_count = 1;
+			((struct cont_a64_entry *) pkt)->sys_define =
+				(uint8_t)ha->req_ring_index;
+			/* Setup packet address segment pointer. */
+			dword_ptr =
+				(u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;
+
+			/* Load continuation entry data segments. */
+			for_each_sg(sg, s, remseg, cnt) {
+				if (cnt == 5)
 					break;
 				dma_handle = sg_dma_address(s);
 #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
-				if (ha->flags.use_pci_vchannel)
-					sn_pci_set_vchan(ha->pdev,
-							(unsigned long *)&dma_handle,
-							 SCSI_BUS_32(cmd));
+			if (ha->flags.use_pci_vchannel)
+				sn_pci_set_vchan(ha->pdev, 
+						(unsigned long *)&dma_handle,
+						 SCSI_BUS_32(cmd));
 #endif
 				*dword_ptr++ =
 					cpu_to_le32(pci_dma_lo32(dma_handle));
 				*dword_ptr++ =
 					cpu_to_le32(pci_dma_hi32(dma_handle));
-				*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
-				dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
+				*dword_ptr++ =
+					cpu_to_le32(sg_dma_len(s));
+				dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
 					cpu_to_le32(pci_dma_hi32(dma_handle)),
 					cpu_to_le32(pci_dma_lo32(dma_handle)),
-					cpu_to_le32(sg_dma_len(sg_next(s))));
-				remseg--;
+					cpu_to_le32(sg_dma_len(s)));
 			}
-			dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
-				"command packet data - b %i, t %i, l %i \n",
-				SCSI_BUS_32(cmd), SCSI_TCN_32(cmd),
-				SCSI_LUN_32(cmd));
+			remseg -= cnt;
+			dprintk(5, "qla1280_64bit_start_scsi: "
+				"continuation packet data - b %i, t "
+				"%i, l %i \n", SCSI_BUS_32(cmd),
+				SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
 			qla1280_dump_buffer(5, (char *)pkt,
 					    REQUEST_ENTRY_SIZE);
-
-			/*
-			 * Build continuation packets.
-			 */
-			dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
-				"remains\n", seg_cnt);
-
-			while (remseg > 0) {
-				/* Update sg start */
-				sg = s;
-				/* Adjust ring index. */
-				ha->req_ring_index++;
-				if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
-					ha->req_ring_index = 0;
-					ha->request_ring_ptr =
-						ha->request_ring;
-				} else
-						ha->request_ring_ptr++;
-
-				pkt = (cmd_a64_entry_t *)ha->request_ring_ptr;
-
-				/* Zero out packet. */
-				memset(pkt, 0, REQUEST_ENTRY_SIZE);
-
-				/* Load packet defaults. */
-				((struct cont_a64_entry *) pkt)->entry_type =
-					CONTINUE_A64_TYPE;
-				((struct cont_a64_entry *) pkt)->entry_count = 1;
-				((struct cont_a64_entry *) pkt)->sys_define =
-					(uint8_t)ha->req_ring_index;
-				/* Setup packet address segment pointer. */
-				dword_ptr =
-					(u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;
-
-				/* Load continuation entry data segments. */
-				for_each_sg(sg, s, remseg, cnt) {
-					if (cnt == 5)
-						break;
-					dma_handle = sg_dma_address(s);
-#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
-				if (ha->flags.use_pci_vchannel)
-					sn_pci_set_vchan(ha->pdev, 
-							(unsigned long *)&dma_handle,
-							 SCSI_BUS_32(cmd));
-#endif
-					*dword_ptr++ =
-						cpu_to_le32(pci_dma_lo32(dma_handle));
-					*dword_ptr++ =
-						cpu_to_le32(pci_dma_hi32(dma_handle));
-					*dword_ptr++ =
-						cpu_to_le32(sg_dma_len(s));
-					dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
-						cpu_to_le32(pci_dma_hi32(dma_handle)),
-						cpu_to_le32(pci_dma_lo32(dma_handle)),
-						cpu_to_le32(sg_dma_len(s)));
-				}
-				remseg -= cnt;
-				dprintk(5, "qla1280_64bit_start_scsi: "
-					"continuation packet data - b %i, t "
-					"%i, l %i \n", SCSI_BUS_32(cmd),
-					SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
-				qla1280_dump_buffer(5, (char *)pkt,
-						    REQUEST_ENTRY_SIZE);
-			}
 		}
 	} else {	/* No data transfer */
 		dprintk(5, "qla1280_64bit_start_scsi: No data, command "
@@ -3150,78 +3148,76 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 		/* Setup packet address segment pointer. */
 		dword_ptr = &pkt->dseg_0_address;
 
-		{	/* FIXME:Indentation in next patch */
-			dprintk(3, "Building S/G data segments..\n");
-			qla1280_dump_buffer(1, (char *)sg, 4 * 16);
+		dprintk(3, "Building S/G data segments..\n");
+		qla1280_dump_buffer(1, (char *)sg, 4 * 16);
 
-			/* Load command entry data segments. */
-			for_each_sg(sg, s, seg_cnt, cnt) {
-				if (cnt == 4)
+		/* Load command entry data segments. */
+		for_each_sg(sg, s, seg_cnt, cnt) {
+			if (cnt == 4)
+				break;
+			*dword_ptr++ =
+				cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
+			*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
+			dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
+				(pci_dma_lo32(sg_dma_address(s))),
+				(sg_dma_len(s)));
+			remseg--;
+		}
+		/*
+		 * Build continuation packets.
+		 */
+		dprintk(3, "S/G Building Continuation"
+			"...seg_cnt=0x%x remains\n", seg_cnt);
+		while (remseg > 0) {
+			/* Continue from end point */
+			sg = s;
+			/* Adjust ring index. */
+			ha->req_ring_index++;
+			if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
+				ha->req_ring_index = 0;
+				ha->request_ring_ptr =
+					ha->request_ring;
+			} else
+				ha->request_ring_ptr++;
+
+			pkt = (struct cmd_entry *)ha->request_ring_ptr;
+
+			/* Zero out packet. */
+			memset(pkt, 0, REQUEST_ENTRY_SIZE);
+
+			/* Load packet defaults. */
+			((struct cont_entry *) pkt)->
+				entry_type = CONTINUE_TYPE;
+			((struct cont_entry *) pkt)->entry_count = 1;
+
+			((struct cont_entry *) pkt)->sys_define =
+				(uint8_t) ha->req_ring_index;
+
+			/* Setup packet address segment pointer. */
+			dword_ptr =
+				&((struct cont_entry *) pkt)->dseg_0_address;
+
+			/* Load continuation entry data segments. */
+			for_each_sg(sg, s, remseg, cnt) {
+				if (cnt == 7)
 					break;
 				*dword_ptr++ =
 					cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
-				*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
-				dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
-					(pci_dma_lo32(sg_dma_address(s))),
-					(sg_dma_len(s)));
-				remseg--;
-			}
-			/*
-			 * Build continuation packets.
-			 */
-			dprintk(3, "S/G Building Continuation"
-				"...seg_cnt=0x%x remains\n", seg_cnt);
-			while (remseg > 0) {
-				/* Continue from end point */
-				sg = s;
-				/* Adjust ring index. */
-				ha->req_ring_index++;
-				if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
-					ha->req_ring_index = 0;
-					ha->request_ring_ptr =
-						ha->request_ring;
-				} else
-					ha->request_ring_ptr++;
-
-				pkt = (struct cmd_entry *)ha->request_ring_ptr;
-
-				/* Zero out packet. */
-				memset(pkt, 0, REQUEST_ENTRY_SIZE);
-
-				/* Load packet defaults. */
-				((struct cont_entry *) pkt)->
-					entry_type = CONTINUE_TYPE;
-				((struct cont_entry *) pkt)->entry_count = 1;
-
-				((struct cont_entry *) pkt)->sys_define =
-					(uint8_t) ha->req_ring_index;
-
-				/* Setup packet address segment pointer. */
-				dword_ptr =
-					&((struct cont_entry *) pkt)->dseg_0_address;
-
-				/* Load continuation entry data segments. */
-				for_each_sg(sg, s, remseg, cnt) {
-					if (cnt == 7)
-						break;
-					*dword_ptr++ =
-						cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
-					*dword_ptr++ =
-						cpu_to_le32(sg_dma_len(s));
-					dprintk(1,
-						"S/G Segment Cont. phys_addr=0x%x, "
-						"len=0x%x\n",
-						cpu_to_le32(pci_dma_lo32(sg_dma_address(s))),
-						cpu_to_le32(sg_dma_len(s)));
-				}
-				remseg -= cnt;
-				dprintk(5, "qla1280_32bit_start_scsi: "
-					"continuation packet data - "
-					"scsi(%i:%i:%i)\n", SCSI_BUS_32(cmd),
-					SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
-				qla1280_dump_buffer(5, (char *)pkt,
-						    REQUEST_ENTRY_SIZE);
+				*dword_ptr++ =
+					cpu_to_le32(sg_dma_len(s));
+				dprintk(1,
+					"S/G Segment Cont. phys_addr=0x%x, "
+					"len=0x%x\n",
+					cpu_to_le32(pci_dma_lo32(sg_dma_address(s))),
+					cpu_to_le32(sg_dma_len(s)));
 			}
+			remseg -= cnt;
+			dprintk(5, "qla1280_32bit_start_scsi: "
+				"continuation packet data - "
+				"scsi(%i:%i:%i)\n", SCSI_BUS_32(cmd),
+				SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
+			qla1280_dump_buffer(5, (char *)pkt,
+					    REQUEST_ENTRY_SIZE);
 		}
 	} else {	/* No data transfer at all */
 		dprintk(5, "qla1280_32bit_start_scsi: No data, command "
-- 
1.5.3.1

[PATCH 23/32] scsi_debug: convert to use the data buffer accessors

[Boaz Harrosh]

  - remove the unnecessary map_single path.
  - convert to use the new accessors for the sg lists and the
    parameters.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: FUJITA Tomonori <tomof@acm.org>
Signed-off-by: Douglas Gilbert <dougg@torque.net>
---
 drivers/scsi/scsi_debug.c |   36 ++++++++++--------------------------
 1 files changed, 10 insertions(+), 26 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 72ee4c9..c08ebf4 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -329,7 +329,7 @@ int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
 	if (done == NULL)
 		return 0;	/* assume mid level reprocessing command */
 
-	SCpnt->resid = 0;
+	scsi_set_resid(SCpnt, 0);
 	if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
 		printk(KERN_INFO "scsi_debug: cmd ");
 		for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
@@ -603,26 +603,16 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
 	void * kaddr_off;
 	struct scatterlist * sg;
 
-	if (0 == scp->request_bufflen)
+	if (0 == scsi_bufflen(scp))
 		return 0;
-	if (NULL == scp->request_buffer)
+	if (NULL == scsi_sglist(scp))
 		return (DID_ERROR << 16);
 	if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
 	      (scp->sc_data_direction == DMA_FROM_DEVICE)))
 		return (DID_ERROR << 16);
-	if (0 == scp->use_sg) {
-		req_len = scp->request_bufflen;
-		act_len = (req_len < arr_len) ? req_len : arr_len;
-		memcpy(scp->request_buffer, arr, act_len);
-		if (scp->resid)
-			scp->resid -= act_len;
-		else
-			scp->resid = req_len - act_len;
-		return 0;
-	}
 	active = 1;
 	req_len = act_len = 0;
-	scsi_for_each_sg(scp, sg, scp->use_sg, k) {
+	scsi_for_each_sg(scp, sg, scsi_sg_count(scp), k) {
 		if (active) {
 			kaddr = (unsigned char *)
 				kmap_atomic(sg->page, KM_USER0);
@@ -640,10 +630,10 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
 		}
 		req_len += sg->length;
 	}
-	if (scp->resid)
-		scp->resid -= act_len;
+	if (scsi_get_resid(scp))
+		scsi_set_resid(scp, scsi_get_resid(scp) - act_len);
 	else
-		scp->resid = req_len - act_len;
+		scsi_set_resid(scp, req_len - act_len);
 	return 0;
 }
 
@@ -656,22 +646,16 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
 	void * kaddr_off;
 	struct scatterlist * sg;
 
-	if (0 == scp->request_bufflen)
+	if (0 == scsi_bufflen(scp))
 		return 0;
-	if (NULL == scp->request_buffer)
+	if (NULL == scsi_sglist(scp))
 		return -1;
 	if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
 	      (scp->sc_data_direction == DMA_TO_DEVICE)))
 		return -1;
-	if (0 == scp->use_sg) {
-		req_len = scp->request_bufflen;
-		len = (req_len < max_arr_len) ? req_len : max_arr_len;
-		memcpy(arr, scp->request_buffer, len);
-		return len;
-	}
 	sg = scsi_sglist(scp);
 	req_len = fin = 0;
-	for (k = 0; k < scp->use_sg; ++k, sg = sg_next(sg)) {
+	for (k = 0; k < scsi_sg_count(scp); ++k, sg = sg_next(sg)) {
 		kaddr = (unsigned char *)kmap_atomic(sg->page, KM_USER0);
 		if (NULL == kaddr)
 			return -1;
-- 
1.5.3.1

[PATCH 24/32] wd7000.c - proper fix for boards without sg support

[Boaz Harrosh]

  - code used to set sg_tablesize to zero for board revision
    less than 6. This is no longer supported, therefore I
    use sg_tablesize=1 and open code the sg handling for that case.
  - Get rid of use of SG_NONE which will be removed soon.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/wd7000.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c
index 255c611..3887640 100644
--- a/drivers/scsi/wd7000.c
+++ b/drivers/scsi/wd7000.c
@@ -1108,13 +1108,10 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,
 	scb->host = host;
 
 	nseg = scsi_sg_count(SCpnt);
-	if (nseg) {
+	if (nseg > 1) {
 		struct scatterlist *sg;
 		unsigned i;
 
-		if (SCpnt->device->host->sg_tablesize == SG_NONE) {
-			panic("wd7000_queuecommand: scatter/gather not supported.\n");
-		}
 		dprintk("Using scatter/gather with %d elements.\n", nseg);
 
 		sgb = scb->sgb;
@@ -1128,7 +1125,10 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,
 		}
 	} else {
 		scb->op = 0;
-		any2scsi(scb->dataptr, isa_virt_to_bus(scsi_sglist(SCpnt)));
+		if (nseg) {
+			struct scatterlist *sg = scsi_sglist(SCpnt);
+			any2scsi(scb->dataptr, isa_page_to_bus(sg->page) + sg->offset);
+		}
 		any2scsi(scb->maxlen, scsi_bufflen(SCpnt));
 	}
 
@@ -1524,7 +1524,7 @@ static __init int wd7000_detect(struct scsi_host_template *tpnt)
 				 *  For boards before rev 6.0, scatter/gather isn't supported.
 				 */
 				if (host->rev1 < 6)
-					sh->sg_tablesize = SG_NONE;
+					sh->sg_tablesize = 1;
 
 				present++;	/* count it */
 
-- 
1.5.3.1

[PATCH 25/32] Remove psi240i driver from kernel

[Boaz Harrosh]

  The psi240i driver is still written for cmnd->request_buffer
  as a char pointer to actual data. There was never any attempt
  to use the scatterlist option.

  - remove all source files (3) from drivers/scsi
  - Remove from Makefile and Kconfig

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/Kconfig    |   11 -
 drivers/scsi/Makefile   |    1 -
 drivers/scsi/psi240i.c  |  689 -----------------------------------------------
 drivers/scsi/psi240i.h  |  315 ---------------------
 drivers/scsi/psi_chip.h |  195 -------------
 5 files changed, 0 insertions(+), 1211 deletions(-)
 delete mode 100644 drivers/scsi/psi240i.c
 delete mode 100644 drivers/scsi/psi240i.h
 delete mode 100644 drivers/scsi/psi_chip.h

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 30905ce..0480f6b 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1288,17 +1288,6 @@ config SCSI_PAS16
 	  To compile this driver as a module, choose M here: the
 	  module will be called pas16.
 
-config SCSI_PSI240I
-	tristate "PSI240i support"
-	depends on ISA && SCSI
-	help
-	  This is support for the PSI240i EIDE interface card which acts as a
-	  SCSI host adapter.  Please read the SCSI-HOWTO, available from
-	  <http://www.tldp.org/docs.html#howto>.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called psi240i.
-
 config SCSI_QLOGIC_FAS
 	tristate "Qlogic FAS SCSI support"
 	depends on ISA && SCSI
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 6141389..ffb800d 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -59,7 +59,6 @@ obj-$(CONFIG_MVME16x_SCSI)	+= 53c700.o	mvme16x_scsi.o
 obj-$(CONFIG_BVME6000_SCSI)	+= 53c700.o	bvme6000_scsi.o
 obj-$(CONFIG_SCSI_SIM710)	+= 53c700.o	sim710.o
 obj-$(CONFIG_SCSI_ADVANSYS)	+= advansys.o
-obj-$(CONFIG_SCSI_PSI240I)	+= psi240i.o
 obj-$(CONFIG_SCSI_BUSLOGIC)	+= BusLogic.o
 obj-$(CONFIG_SCSI_DPT_I2O)	+= dpt_i2o.o
 obj-$(CONFIG_SCSI_U14_34F)	+= u14-34f.o
diff --git a/drivers/scsi/psi240i.c b/drivers/scsi/psi240i.c
deleted file mode 100644
index 899e89d..0000000
--- a/drivers/scsi/psi240i.c
+++ /dev/null
@@ -1,689 +0,0 @@
-/*+M*************************************************************************
- * Perceptive Solutions, Inc. PSI-240I device driver proc support for Linux.
- *
- * Copyright (c) 1997 Perceptive Solutions, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING.  If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *
- *	File Name:		psi240i.c
- *
- *	Description:	SCSI driver for the PSI240I EIDE interface card.
- *
- *-M*************************************************************************/
-
-#include <linux/module.h>
-
-#include <linux/blkdev.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/ioport.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-#include <linux/proc_fs.h>
-#include <linux/spinlock.h>
-#include <linux/stat.h>
-
-#include <asm/dma.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include "scsi.h"
-#include <scsi/scsi_host.h>
-
-#include "psi240i.h"
-#include "psi_chip.h"
-
-//#define DEBUG 1
-
-#ifdef DEBUG
-#define DEB(x) x
-#else
-#define DEB(x)
-#endif
-
-#define MAXBOARDS 6	/* Increase this and the sizes of the arrays below, if you need more. */
-
-#define	PORT_DATA				0
-#define	PORT_ERROR				1
-#define	PORT_SECTOR_COUNT		2
-#define	PORT_LBA_0				3
-#define	PORT_LBA_8				4
-#define	PORT_LBA_16				5
-#define	PORT_LBA_24				6
-#define	PORT_STAT_CMD			7
-#define	PORT_SEL_FAIL			8
-#define	PORT_IRQ_STATUS			9
-#define	PORT_ADDRESS			10
-#define	PORT_FAIL				11
-#define	PORT_ALT_STAT		   	12
-
-typedef struct
-	{
-	UCHAR		   	device;				// device code
-	UCHAR			byte6;				// device select register image
-	UCHAR			spigot;				// spigot number
-	UCHAR			expectingIRQ;		// flag for expecting and interrupt
-	USHORT			sectors;			// number of sectors per track
-	USHORT			heads;				// number of heads
-	USHORT			cylinders;			// number of cylinders for this device
-	USHORT			spareword;			// placeholder
-	ULONG			blocks;				// number of blocks on device
-	}	OUR_DEVICE, *POUR_DEVICE;
-
-typedef struct
-	{
-	USHORT		 ports[13];
-	OUR_DEVICE	 device[8];
-	struct scsi_cmnd *pSCmnd;
-	IDE_STRUCT	 ide;
-	ULONG		 startSector;
-	USHORT		 sectorCount;
-	struct scsi_cmnd *SCpnt;
-	VOID		*buffer;
-	USHORT		 expectingIRQ;
-	}	ADAPTER240I, *PADAPTER240I;
-
-#define HOSTDATA(host) ((PADAPTER240I)&host->hostdata)
-
-static struct	Scsi_Host *PsiHost[6] = {NULL,};  /* One for each IRQ level (10-15) */
-static			IDENTIFY_DATA	identifyData;
-static			SETUP			ChipSetup;
-
-static	USHORT	portAddr[6] = {CHIP_ADRS_0, CHIP_ADRS_1, CHIP_ADRS_2, CHIP_ADRS_3, CHIP_ADRS_4, CHIP_ADRS_5};
-
-/****************************************************************
- *	Name:	WriteData	:LOCAL
- *
- *	Description:	Write data to device.
- *
- *	Parameters:		padapter - Pointer adapter data structure.
- *
- *	Returns:		TRUE if drive does not assert DRQ in time.
- *
- ****************************************************************/
-static int WriteData (PADAPTER240I padapter)
-	{
-	ULONG	timer;
-	USHORT *pports = padapter->ports;
-
-	timer = jiffies + TIMEOUT_DRQ;								// calculate the timeout value
-	do  {
-		if ( inb_p (pports[PORT_STAT_CMD]) & IDE_STATUS_DRQ )
-			{
-			outsw (pports[PORT_DATA], padapter->buffer, (USHORT)padapter->ide.ide.ide[2] * 256);
-			return 0;
-			}
-		}	while ( time_after(timer, jiffies) );									// test for timeout
-
-	padapter->ide.ide.ides.cmd = 0;									// null out the command byte
-	return 1;
-	}
-/****************************************************************
- *	Name:	IdeCmd	:LOCAL
- *
- *	Description:	Process a queued command from the SCSI manager.
- *
- *	Parameters:		padapter - Pointer adapter data structure.
- *
- *	Returns:		Zero if no error or status register contents on error.
- *
- ****************************************************************/
-static UCHAR IdeCmd (PADAPTER240I padapter)
-	{
-	ULONG	timer;
-	USHORT *pports = padapter->ports;
-	UCHAR	status;
-
-	outb_p (padapter->ide.ide.ides.spigot, pports[PORT_SEL_FAIL]);	// select the spigot
-	outb_p (padapter->ide.ide.ide[6], pports[PORT_LBA_24]);			// select the drive
-	timer = jiffies + TIMEOUT_READY;							// calculate the timeout value
-	do  {
-		status = inb_p (padapter->ports[PORT_STAT_CMD]);
-		if ( status & IDE_STATUS_DRDY )
-			{
-			outb_p (padapter->ide.ide.ide[2], pports[PORT_SECTOR_COUNT]);
-			outb_p (padapter->ide.ide.ide[3], pports[PORT_LBA_0]);
-			outb_p (padapter->ide.ide.ide[4], pports[PORT_LBA_8]);
-			outb_p (padapter->ide.ide.ide[5], pports[PORT_LBA_16]);
-			padapter->expectingIRQ = 1;
-			outb_p (padapter->ide.ide.ide[7], pports[PORT_STAT_CMD]);
-
-			if ( padapter->ide.ide.ides.cmd == IDE_CMD_WRITE_MULTIPLE )
-				return (WriteData (padapter));
-
-			return 0;
-			}
-		}	while ( time_after(timer, jiffies) );									// test for timeout
-
-	padapter->ide.ide.ides.cmd = 0;									// null out the command byte
-	return status;
-	}
-/****************************************************************
- *	Name:	SetupTransfer	:LOCAL
- *
- *	Description:	Setup a data transfer command.
- *
- *	Parameters:		padapter - Pointer adapter data structure.
- *					drive	 - Drive/head register upper nibble only.
- *
- *	Returns:		TRUE if no data to transfer.
- *
- ****************************************************************/
-static int SetupTransfer (PADAPTER240I padapter, UCHAR drive)
-	{
-	if ( padapter->sectorCount )
-		{
-		*(ULONG *)padapter->ide.ide.ides.lba = padapter->startSector;
-		padapter->ide.ide.ide[6] |= drive;
-		padapter->ide.ide.ides.sectors = ( padapter->sectorCount > SECTORSXFER ) ? SECTORSXFER : padapter->sectorCount;
-		padapter->sectorCount -= padapter->ide.ide.ides.sectors;	// bump the start and count for next xfer
-		padapter->startSector += padapter->ide.ide.ides.sectors;
-		return 0;
-		}
-	else
-		{
-		padapter->ide.ide.ides.cmd = 0;								// null out the command byte
-		padapter->SCpnt = NULL;
-		return 1;
-		}
-	}
-/****************************************************************
- *	Name:	DecodeError	:LOCAL
- *
- *	Description:	Decode and process device errors.
- *
- *	Parameters:		pshost - Pointer to host data block.
- *					status - Status register code.
- *
- *	Returns:		The driver status code.
- *
- ****************************************************************/
-static ULONG DecodeError (struct Scsi_Host *pshost, UCHAR status)
-	{
-	PADAPTER240I	padapter = HOSTDATA(pshost);
-	UCHAR			error;
-
-	padapter->expectingIRQ = 0;
-	padapter->SCpnt = NULL;
-	if ( status & IDE_STATUS_WRITE_FAULT )
-		{
-		return DID_PARITY << 16;
-		}
-	if ( status & IDE_STATUS_BUSY )
-		return DID_BUS_BUSY << 16;
-
-	error = inb_p (padapter->ports[PORT_ERROR]);
-	DEB(printk ("\npsi240i error register: %x", error));
-	switch ( error )
-		{
-		case IDE_ERROR_AMNF:
-		case IDE_ERROR_TKONF:
-		case IDE_ERROR_ABRT:
-		case IDE_ERROR_IDFN:
-		case IDE_ERROR_UNC:
-		case IDE_ERROR_BBK:
-		default:
-			return DID_ERROR << 16;
-		}
-	return DID_ERROR << 16;
-	}
-/****************************************************************
- *	Name:	Irq_Handler	:LOCAL
- *
- *	Description:	Interrupt handler.
- *
- *	Parameters:		irq		- Hardware IRQ number.
- *					dev_id	-
- *
- *	Returns:		TRUE if drive is not ready in time.
- *
- ****************************************************************/
-static void Irq_Handler (int irq, void *dev_id)
-	{
-	struct Scsi_Host *shost;	// Pointer to host data block
-	PADAPTER240I padapter;		// Pointer to adapter control structure
-	USHORT *pports;			// I/O port array
-	struct scsi_cmnd *SCpnt;
-	UCHAR status;
-	int z;
-
-	DEB(printk ("\npsi240i received interrupt\n"));
-
-	shost = PsiHost[irq - 10];
-	if ( !shost )
-		panic ("Splunge!");
-
-	padapter = HOSTDATA(shost);
-	pports = padapter->ports;
-	SCpnt = padapter->SCpnt;
-
-	if ( !padapter->expectingIRQ )
-		{
-		DEB(printk ("\npsi240i Unsolicited interrupt\n"));
-		return;
-		}
-	padapter->expectingIRQ = 0;
-
-	status = inb_p (padapter->ports[PORT_STAT_CMD]);			// read the device status
-	if ( status & (IDE_STATUS_ERROR | IDE_STATUS_WRITE_FAULT) )
-		goto irqerror;
-
-	DEB(printk ("\npsi240i processing interrupt"));
-	switch ( padapter->ide.ide.ides.cmd )							// decide how to handle the interrupt
-		{
-		case IDE_CMD_READ_MULTIPLE:
-			if ( status & IDE_STATUS_DRQ )
-				{
-				insw (pports[PORT_DATA], padapter->buffer, (USHORT)padapter->ide.ide.ides.sectors * 256);
-				padapter->buffer += padapter->ide.ide.ides.sectors * 512;
-				if ( SetupTransfer (padapter, padapter->ide.ide.ide[6] & 0xF0) )
-					{
-					SCpnt->result = DID_OK << 16;
-					padapter->SCpnt = NULL;
-					SCpnt->scsi_done (SCpnt);
-					return;
-					}
-				if ( !(status = IdeCmd (padapter)) )
-					return;
-				}
-			break;
-
-		case IDE_CMD_WRITE_MULTIPLE:
-			padapter->buffer += padapter->ide.ide.ides.sectors * 512;
-			if ( SetupTransfer (padapter, padapter->ide.ide.ide[6] & 0xF0) )
-				{
-				SCpnt->result = DID_OK << 16;
-				padapter->SCpnt = NULL;
-				SCpnt->scsi_done (SCpnt);
-				return;
-				}
-			if ( !(status = IdeCmd (padapter)) )
-				return;
-			break;
-
-		case IDE_COMMAND_IDENTIFY:
-			{
-			PINQUIRYDATA	pinquiryData  = SCpnt->request_buffer;
-
-			if ( status & IDE_STATUS_DRQ )
-				{
-				insw (pports[PORT_DATA], &identifyData, sizeof (identifyData) >> 1);
-
-				memset (pinquiryData, 0, SCpnt->request_bufflen);		// Zero INQUIRY data structure.
-				pinquiryData->DeviceType = 0;
-				pinquiryData->Versions = 2;
-				pinquiryData->AdditionalLength = 35 - 4;
-
-				// Fill in vendor identification fields.
-				for ( z = 0;  z < 8;  z += 2 )
-					{
-					pinquiryData->VendorId[z]	  = ((UCHAR *)identifyData.ModelNumber)[z + 1];
-					pinquiryData->VendorId[z + 1] = ((UCHAR *)identifyData.ModelNumber)[z];
-					}
-
-				// Initialize unused portion of product id.
-				for ( z = 0;  z < 4;  z++ )
-					pinquiryData->ProductId[12 + z] = ' ';
-
-				// Move firmware revision from IDENTIFY data to
-				// product revision in INQUIRY data.
-				for ( z = 0;  z < 4;  z += 2 )
-					{
-					pinquiryData->ProductRevisionLevel[z]	 = ((UCHAR *)identifyData.FirmwareRevision)[z + 1];
-					pinquiryData->ProductRevisionLevel[z + 1] = ((UCHAR *)identifyData.FirmwareRevision)[z];
-					}
-
-				SCpnt->result = DID_OK << 16;
-				padapter->SCpnt = NULL;
-				SCpnt->scsi_done (SCpnt);
-				return;
-				}
-			break;
-			}
-
-		default:
-			SCpnt->result = DID_OK << 16;
-			padapter->SCpnt = NULL;
-			SCpnt->scsi_done (SCpnt);
-			return;
-		}
-
-irqerror:;
-	DEB(printk ("\npsi240i error  Device Status: %X\n", status));
-	SCpnt->result = DecodeError (shost, status);
-	SCpnt->scsi_done (SCpnt);
-	}
-
-static irqreturn_t do_Irq_Handler (int irq, void *dev_id)
-{
-	unsigned long flags;
-	struct Scsi_Host *dev = dev_id;
-	
-	spin_lock_irqsave(dev->host_lock, flags);
-	Irq_Handler(irq, dev_id);
-	spin_unlock_irqrestore(dev->host_lock, flags);
-	return IRQ_HANDLED;
-}
-
-/****************************************************************
- *	Name:	Psi240i_QueueCommand
- *
- *	Description:	Process a queued command from the SCSI manager.
- *
- *	Parameters:		SCpnt - Pointer to SCSI command structure.
- *					done  - Pointer to done function to call.
- *
- *	Returns:		Status code.
- *
- ****************************************************************/
-static int Psi240i_QueueCommand(struct scsi_cmnd *SCpnt,
-				void (*done)(struct scsi_cmnd *))
-	{
-	UCHAR *cdb = (UCHAR *)SCpnt->cmnd;
-	// Pointer to SCSI CDB
-	PADAPTER240I padapter = HOSTDATA (SCpnt->device->host);
-	// Pointer to adapter control structure
-	POUR_DEVICE pdev = &padapter->device [SCpnt->device->id];
-	// Pointer to device information
-	UCHAR rc;
-	// command return code
-
-	SCpnt->scsi_done = done;
-	padapter->ide.ide.ides.spigot = pdev->spigot;
-	padapter->buffer = SCpnt->request_buffer;
-	if (done)
-		{
-		if ( !pdev->device )
-			{
-			SCpnt->result = DID_BAD_TARGET << 16;
-			done (SCpnt);
-			return 0;
-			}
-		}
-	else
-		{
-		printk("psi240i_queuecommand: %02X: done can't be NULL\n", *cdb);
-		return 0;
-		}
-
-	switch ( *cdb )
-		{
-		case SCSIOP_INQUIRY:   					// inquiry CDB
-			{
-			padapter->ide.ide.ide[6] = pdev->byte6;
-			padapter->ide.ide.ides.cmd = IDE_COMMAND_IDENTIFY;
-			break;
-			}
-
-		case SCSIOP_TEST_UNIT_READY:			// test unit ready CDB
-			SCpnt->result = DID_OK << 16;
-			done (SCpnt);
-			return 0;
-
-		case SCSIOP_READ_CAPACITY:			  	// read capctiy CDB
-			{
-			PREAD_CAPACITY_DATA	pdata = (PREAD_CAPACITY_DATA)SCpnt->request_buffer;
-
-			pdata->blksiz = 0x20000;
-			XANY2SCSI ((UCHAR *)&pdata->blks, pdev->blocks);
-			SCpnt->result = DID_OK << 16;
-			done (SCpnt);
-			return 0;
-			}
-
-		case SCSIOP_VERIFY:						// verify CDB
-			*(ULONG *)padapter->ide.ide.ides.lba = XSCSI2LONG (&cdb[2]);
-			padapter->ide.ide.ide[6] |= pdev->byte6;
-			padapter->ide.ide.ide[2] = (UCHAR)((USHORT)cdb[8] | ((USHORT)cdb[7] << 8));
-			padapter->ide.ide.ides.cmd = IDE_COMMAND_VERIFY;
-			break;
-
-		case SCSIOP_READ:						// read10 CDB
-			padapter->startSector = XSCSI2LONG (&cdb[2]);
-			padapter->sectorCount = (USHORT)cdb[8] | ((USHORT)cdb[7] << 8);
-			SetupTransfer (padapter, pdev->byte6);
-			padapter->ide.ide.ides.cmd = IDE_CMD_READ_MULTIPLE;
-			break;
-
-		case SCSIOP_READ6:						// read6  CDB
-			padapter->startSector = SCSI2LONG (&cdb[1]);
-			padapter->sectorCount = cdb[4];
-			SetupTransfer (padapter, pdev->byte6);
-			padapter->ide.ide.ides.cmd = IDE_CMD_READ_MULTIPLE;
-			break;
-
-		case SCSIOP_WRITE:						// write10 CDB
-			padapter->startSector = XSCSI2LONG (&cdb[2]);
-			padapter->sectorCount = (USHORT)cdb[8] | ((USHORT)cdb[7] << 8);
-			SetupTransfer (padapter, pdev->byte6);
-			padapter->ide.ide.ides.cmd = IDE_CMD_WRITE_MULTIPLE;
-			break;
-		case SCSIOP_WRITE6:						// write6  CDB
-			padapter->startSector = SCSI2LONG (&cdb[1]);
-			padapter->sectorCount = cdb[4];
-			SetupTransfer (padapter, pdev->byte6);
-			padapter->ide.ide.ides.cmd = IDE_CMD_WRITE_MULTIPLE;
-			break;
-
-		default:
-			DEB (printk ("psi240i_queuecommand: Unsupported command %02X\n", *cdb));
-			SCpnt->result = DID_ERROR << 16;
-			done (SCpnt);
-			return 0;
-		}
-
-	padapter->SCpnt = SCpnt;  									// Save this command data
-
-	rc = IdeCmd (padapter);
-	if ( rc )
-		{
-		padapter->expectingIRQ = 0;
-		DEB (printk ("psi240i_queuecommand: %02X, %02X: Device failed to respond for command\n", *cdb, padapter->ide.ide.ides.cmd));
-		SCpnt->result = DID_ERROR << 16;
-		done (SCpnt);
-		return 0;
-		}
-	DEB (printk("psi240i_queuecommand: %02X, %02X now waiting for interrupt ", *cdb, padapter->ide.ide.ides.cmd));
-	return 0;
-	}
-
-/***************************************************************************
- *	Name:			ReadChipMemory
- *
- *	Description:	Read information from controller memory.
- *
- *	Parameters:		psetup	- Pointer to memory image of setup information.
- *					base	- base address of memory.
- *					length	- lenght of data space in bytes.
- *					port	- I/O address of data port.
- *
- *	Returns:		Nothing.
- *
- **************************************************************************/
-static void ReadChipMemory (void *pdata, USHORT base, USHORT length, USHORT port)
-	{
-	USHORT	z, zz;
-	UCHAR	*pd = (UCHAR *)pdata;
-	outb_p (SEL_NONE, port + REG_SEL_FAIL);				// setup data port
-	zz = 0;
-	while ( zz < length )
-		{
-		outw_p (base, port + REG_ADDRESS);				// setup address
-
-		for ( z = 0;  z < 8;  z++ )
-			{
-			if ( (zz + z) < length )
-			*pd++ = inb_p (port + z);	// read data byte
-			}
-		zz += 8;
-		base += 8;
-		}
-	}
-/****************************************************************
- *	Name:	Psi240i_Detect
- *
- *	Description:	Detect and initialize our boards.
- *
- *	Parameters:		tpnt - Pointer to SCSI host template structure.
- *
- *	Returns:		Number of adapters found.
- *
- ****************************************************************/
-static int Psi240i_Detect (struct scsi_host_template *tpnt)
-	{
-	int					board;
-	int					count = 0;
-	int					unit;
-	int					z;
-	USHORT				port, port_range = 16;
-	CHIP_CONFIG_N		chipConfig;
-	CHIP_DEVICE_N		chipDevice[8];
-	struct Scsi_Host   *pshost;
-
-	for ( board = 0;  board < MAXBOARDS;  board++ )					// scan for I/O ports
-		{
-		pshost = NULL;
-		port = portAddr[board];								// get base address to test
-		if ( !request_region (port, port_range, "psi240i") )
-			continue;
-		if ( inb_p (port + REG_FAIL) != CHIP_ID )			// do the first test for likley hood that it is us
-			goto host_init_failure;
-		outb_p (SEL_NONE, port + REG_SEL_FAIL);				// setup EEPROM/RAM access
-		outw (0, port + REG_ADDRESS);						// setup EEPROM address zero
-		if ( inb_p (port) != 0x55 )							// test 1st byte
-			goto host_init_failure;									//   nope
-		if ( inb_p (port + 1) != 0xAA )						// test 2nd byte
-			goto host_init_failure;								//   nope
-
-		// at this point our board is found and can be accessed.  Now we need to initialize
-		// our informatation and register with the kernel.
-
-
-		ReadChipMemory (&chipConfig, CHIP_CONFIG, sizeof (chipConfig), port);
-		ReadChipMemory (&chipDevice, CHIP_DEVICE, sizeof (chipDevice), port);
-		ReadChipMemory (&ChipSetup, CHIP_EEPROM_DATA, sizeof (ChipSetup), port);
-
-		if ( !chipConfig.numDrives )						// if no devices on this board
-			goto host_init_failure;
-
-		pshost = scsi_register (tpnt, sizeof(ADAPTER240I));
-		if(pshost == NULL)
-			goto host_init_failure;	
-
-		PsiHost[chipConfig.irq - 10] = pshost;
-		pshost->unique_id = port;
-		pshost->io_port = port;
-		pshost->n_io_port = 16;  /* Number of bytes of I/O space used */
-		pshost->irq = chipConfig.irq;
-
-		for ( z = 0;  z < 11;  z++ )						// build regester address array
-			HOSTDATA(pshost)->ports[z] = port + z;
-		HOSTDATA(pshost)->ports[11] = port + REG_FAIL;
-		HOSTDATA(pshost)->ports[12] = port + REG_ALT_STAT;
-		DEB (printk ("\nPorts ="));
-		DEB (for (z=0;z<13;z++) printk(" %#04X",HOSTDATA(pshost)->ports[z]););
-
-		for ( z = 0;  z < chipConfig.numDrives;  ++z )
-			{
-			unit = chipDevice[z].channel & 0x0F;
-			HOSTDATA(pshost)->device[unit].device	 = ChipSetup.setupDevice[unit].device;
-			HOSTDATA(pshost)->device[unit].byte6	 = (UCHAR)(((unit & 1) << 4) | 0xE0);
-			HOSTDATA(pshost)->device[unit].spigot	 = (UCHAR)(1 << (unit >> 1));
-			HOSTDATA(pshost)->device[unit].sectors	 = ChipSetup.setupDevice[unit].sectors;
-			HOSTDATA(pshost)->device[unit].heads	 = ChipSetup.setupDevice[unit].heads;
-			HOSTDATA(pshost)->device[unit].cylinders = ChipSetup.setupDevice[unit].cylinders;
-			HOSTDATA(pshost)->device[unit].blocks	 = ChipSetup.setupDevice[unit].blocks;
-			DEB (printk ("\nHOSTDATA->device    = %X", HOSTDATA(pshost)->device[unit].device));
-			DEB (printk ("\n          byte6     = %X", HOSTDATA(pshost)->device[unit].byte6));
-			DEB (printk ("\n          spigot    = %X", HOSTDATA(pshost)->device[unit].spigot));
-			DEB (printk ("\n          sectors   = %X", HOSTDATA(pshost)->device[unit].sectors));
-			DEB (printk ("\n          heads     = %X", HOSTDATA(pshost)->device[unit].heads));
-			DEB (printk ("\n          cylinders = %X", HOSTDATA(pshost)->device[unit].cylinders));
-			DEB (printk ("\n          blocks    = %lX", HOSTDATA(pshost)->device[unit].blocks));
-			}
-
-		if ( request_irq (chipConfig.irq, do_Irq_Handler, 0, "psi240i", pshost) == 0 ) 
-			{
-			printk("\nPSI-240I EIDE CONTROLLER: at I/O = %x  IRQ = %d\n", port, chipConfig.irq);
-		        printk("(C) 1997 Perceptive Solutions, Inc. All rights reserved\n\n");
-		        count++;
-		        continue;
-			}
-
-		printk ("Unable to allocate IRQ for PSI-240I controller.\n");
-           
-host_init_failure:
-		
-		release_region (port, port_range);
-		if (pshost)
-			scsi_unregister (pshost);
-
-		}
-	return count;
-	}
-
-static int Psi240i_Release(struct Scsi_Host *shost)
-{
-	if (shost->irq)
-		free_irq(shost->irq, NULL);
-	if (shost->io_port && shost->n_io_port)
-		release_region(shost->io_port, shost->n_io_port);
-	scsi_unregister(shost);
-	return 0;
-}
-
-/****************************************************************
- *	Name:	Psi240i_BiosParam
- *
- *	Description:	Process the biosparam request from the SCSI manager to
- *					return C/H/S data.
- *
- *	Parameters:		disk - Pointer to SCSI disk structure.
- *					dev	 - Major/minor number from kernel.
- *					geom - Pointer to integer array to place geometry data.
- *
- *	Returns:		zero.
- *
- ****************************************************************/
-static int Psi240i_BiosParam (struct scsi_device *sdev, struct block_device *dev,
-		sector_t capacity, int geom[])
-	{
-	POUR_DEVICE	pdev;
-
-	pdev = &(HOSTDATA(sdev->host)->device[sdev_id(sdev)]);
-
-	geom[0] = pdev->heads;
-	geom[1] = pdev->sectors;
-	geom[2] = pdev->cylinders;
-	return 0;
-	}
-
-MODULE_LICENSE("GPL");
-
-static struct scsi_host_template driver_template = {
-	.proc_name		= "psi240i", 
-	.name			= "PSI-240I EIDE Disk Controller",
-	.detect			= Psi240i_Detect,
-	.release		= Psi240i_Release,
-	.queuecommand		= Psi240i_QueueCommand,
-	.bios_param	  	= Psi240i_BiosParam,
-	.can_queue	  	= 1,
-	.this_id	  	= -1,
-	.sg_tablesize	  	= SG_NONE,
-	.cmd_per_lun	  	= 1, 
-	.use_clustering		= DISABLE_CLUSTERING,
-};
-#include "scsi_module.c"
diff --git a/drivers/scsi/psi240i.h b/drivers/scsi/psi240i.h
deleted file mode 100644
index 21ebb92..0000000
--- a/drivers/scsi/psi240i.h
+++ /dev/null
@@ -1,315 +0,0 @@
-/*+M*************************************************************************
- * Perceptive Solutions, Inc. PSI-240I device driver proc support for Linux.
- *
- * Copyright (c) 1997 Perceptive Solutions, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING.  If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *
- *	File Name:		psi240i.h
- *
- *	Description:	Header file for the SCSI driver for the PSI240I
- *					EIDE interface card.
- *
- *-M*************************************************************************/
-#ifndef _PSI240I_H
-#define _PSI240I_H
-
-#include <linux/types.h>
-
-#ifndef	PSI_EIDE_SCSIOP
-#define	PSI_EIDE_SCSIOP	1
-
-/************************************************/
-/*		Some defines that we like 				*/
-/************************************************/
-#define	CHAR		char
-#define	UCHAR		unsigned char
-#define	SHORT		short
-#define	USHORT		unsigned short
-#define	BOOL		unsigned short
-#define	LONG		long
-#define	ULONG		unsigned long
-#define	VOID		void
-
-/************************************************/
-/*		Timeout konstants		 				*/
-/************************************************/
-#define	TIMEOUT_READY				10		// 100 mSec
-#define	TIMEOUT_DRQ					40		// 400 mSec
-
-/************************************************/
-/*		Misc. macros			 				*/
-/************************************************/
-#define ANY2SCSI(up, p)					\
-((UCHAR *)up)[0] = (((ULONG)(p)) >> 8);	\
-((UCHAR *)up)[1] = ((ULONG)(p));
-
-#define SCSI2LONG(up)					\
-( (((long)*(((UCHAR *)up))) << 16)		\
-+ (((long)(((UCHAR *)up)[1])) << 8)		\
-+ ((long)(((UCHAR *)up)[2])) )
-
-#define XANY2SCSI(up, p)				\
-((UCHAR *)up)[0] = ((long)(p)) >> 24;	\
-((UCHAR *)up)[1] = ((long)(p)) >> 16;	\
-((UCHAR *)up)[2] = ((long)(p)) >> 8;	\
-((UCHAR *)up)[3] = ((long)(p));
-
-#define XSCSI2LONG(up)					\
-( (((long)(((UCHAR *)up)[0])) << 24)	\
-+ (((long)(((UCHAR *)up)[1])) << 16)	\
-+ (((long)(((UCHAR *)up)[2])) <<  8)	\
-+ ((long)(((UCHAR *)up)[3])) )
-
-/************************************************/
-/*		SCSI CDB operation codes 				*/
-/************************************************/
-#define SCSIOP_TEST_UNIT_READY		0x00
-#define SCSIOP_REZERO_UNIT			0x01
-#define SCSIOP_REWIND				0x01
-#define SCSIOP_REQUEST_BLOCK_ADDR	0x02
-#define SCSIOP_REQUEST_SENSE		0x03
-#define SCSIOP_FORMAT_UNIT			0x04
-#define SCSIOP_READ_BLOCK_LIMITS	0x05
-#define SCSIOP_REASSIGN_BLOCKS		0x07
-#define SCSIOP_READ6				0x08
-#define SCSIOP_RECEIVE				0x08
-#define SCSIOP_WRITE6				0x0A
-#define SCSIOP_PRINT				0x0A
-#define SCSIOP_SEND					0x0A
-#define SCSIOP_SEEK6				0x0B
-#define SCSIOP_TRACK_SELECT			0x0B
-#define SCSIOP_SLEW_PRINT			0x0B
-#define SCSIOP_SEEK_BLOCK			0x0C
-#define SCSIOP_PARTITION			0x0D
-#define SCSIOP_READ_REVERSE			0x0F
-#define SCSIOP_WRITE_FILEMARKS		0x10
-#define SCSIOP_FLUSH_BUFFER			0x10
-#define SCSIOP_SPACE				0x11
-#define SCSIOP_INQUIRY				0x12
-#define SCSIOP_VERIFY6				0x13
-#define SCSIOP_RECOVER_BUF_DATA		0x14
-#define SCSIOP_MODE_SELECT			0x15
-#define SCSIOP_RESERVE_UNIT			0x16
-#define SCSIOP_RELEASE_UNIT			0x17
-#define SCSIOP_COPY					0x18
-#define SCSIOP_ERASE				0x19
-#define SCSIOP_MODE_SENSE			0x1A
-#define SCSIOP_START_STOP_UNIT		0x1B
-#define SCSIOP_STOP_PRINT			0x1B
-#define SCSIOP_LOAD_UNLOAD			0x1B
-#define SCSIOP_RECEIVE_DIAGNOSTIC	0x1C
-#define SCSIOP_SEND_DIAGNOSTIC		0x1D
-#define SCSIOP_MEDIUM_REMOVAL		0x1E
-#define SCSIOP_READ_CAPACITY		0x25
-#define SCSIOP_READ					0x28
-#define SCSIOP_WRITE				0x2A
-#define SCSIOP_SEEK					0x2B
-#define SCSIOP_LOCATE				0x2B
-#define SCSIOP_WRITE_VERIFY			0x2E
-#define SCSIOP_VERIFY				0x2F
-#define SCSIOP_SEARCH_DATA_HIGH		0x30
-#define SCSIOP_SEARCH_DATA_EQUAL	0x31
-#define SCSIOP_SEARCH_DATA_LOW		0x32
-#define SCSIOP_SET_LIMITS			0x33
-#define SCSIOP_READ_POSITION		0x34
-#define SCSIOP_SYNCHRONIZE_CACHE	0x35
-#define SCSIOP_COMPARE				0x39
-#define SCSIOP_COPY_COMPARE			0x3A
-#define SCSIOP_WRITE_DATA_BUFF		0x3B
-#define SCSIOP_READ_DATA_BUFF		0x3C
-#define SCSIOP_CHANGE_DEFINITION	0x40
-#define SCSIOP_READ_SUB_CHANNEL		0x42
-#define SCSIOP_READ_TOC				0x43
-#define SCSIOP_READ_HEADER			0x44
-#define SCSIOP_PLAY_AUDIO			0x45
-#define SCSIOP_PLAY_AUDIO_MSF		0x47
-#define SCSIOP_PLAY_TRACK_INDEX		0x48
-#define SCSIOP_PLAY_TRACK_RELATIVE	0x49
-#define SCSIOP_PAUSE_RESUME			0x4B
-#define SCSIOP_LOG_SELECT			0x4C
-#define SCSIOP_LOG_SENSE			0x4D
-#define SCSIOP_MODE_SELECT10		0x55
-#define SCSIOP_MODE_SENSE10			0x5A
-#define SCSIOP_LOAD_UNLOAD_SLOT		0xA6
-#define SCSIOP_MECHANISM_STATUS		0xBD
-#define SCSIOP_READ_CD				0xBE
-
-// IDE command definitions
-#define IDE_COMMAND_ATAPI_RESET		0x08
-#define IDE_COMMAND_READ			0x20
-#define IDE_COMMAND_WRITE			0x30
-#define IDE_COMMAND_RECALIBRATE		0x10
-#define IDE_COMMAND_SEEK			0x70
-#define IDE_COMMAND_SET_PARAMETERS	0x91
-#define IDE_COMMAND_VERIFY			0x40
-#define IDE_COMMAND_ATAPI_PACKET	0xA0
-#define IDE_COMMAND_ATAPI_IDENTIFY	0xA1
-#define	IDE_CMD_READ_MULTIPLE		0xC4
-#define	IDE_CMD_WRITE_MULTIPLE		0xC5
-#define	IDE_CMD_SET_MULTIPLE		0xC6
-#define IDE_COMMAND_WRITE_DMA		0xCA
-#define IDE_COMMAND_READ_DMA		0xC8
-#define IDE_COMMAND_IDENTIFY		0xEC
-
-// IDE status definitions
-#define IDE_STATUS_ERROR			0x01
-#define IDE_STATUS_INDEX			0x02
-#define IDE_STATUS_CORRECTED_ERROR	0x04
-#define IDE_STATUS_DRQ				0x08
-#define IDE_STATUS_DSC				0x10
-#define	IDE_STATUS_WRITE_FAULT		0x20
-#define IDE_STATUS_DRDY				0x40
-#define IDE_STATUS_BUSY				0x80
-
-// IDE error definitions
-#define	IDE_ERROR_AMNF				0x01
-#define	IDE_ERROR_TKONF				0x02
-#define	IDE_ERROR_ABRT				0x04
-#define	IDE_ERROR_MCR				0x08
-#define	IDE_ERROR_IDFN				0x10
-#define	IDE_ERROR_MC				0x20
-#define	IDE_ERROR_UNC				0x40
-#define	IDE_ERROR_BBK				0x80
-
-//	IDE interface structure
-typedef struct _IDE_STRUCT
-	{
-	union
-		{
-		UCHAR	ide[9];
-		struct
-			{
-			USHORT	data;
-			UCHAR	sectors;
-			UCHAR	lba[4];
-			UCHAR	cmd;
-			UCHAR	spigot;
-			}	ides;
-		} ide;
-	}	IDE_STRUCT;
-
-// SCSI read capacity structure
-typedef	struct _READ_CAPACITY_DATA
-	{
-	ULONG blks;				/* total blocks (converted to little endian) */
-	ULONG blksiz;			/* size of each (converted to little endian) */
-	}	READ_CAPACITY_DATA, *PREAD_CAPACITY_DATA;
-
-// SCSI inquiry data
-#ifndef HOSTS_C
-
-typedef struct _INQUIRYDATA
-	{
-	UCHAR DeviceType			:5;
-	UCHAR DeviceTypeQualifier	:3;
-	UCHAR DeviceTypeModifier	:7;
-	UCHAR RemovableMedia		:1;
-    UCHAR Versions;
-    UCHAR ResponseDataFormat;
-    UCHAR AdditionalLength;
-    UCHAR Reserved[2];
-	UCHAR SoftReset				:1;
-	UCHAR CommandQueue			:1;
-	UCHAR Reserved2				:1;
-	UCHAR LinkedCommands		:1;
-	UCHAR Synchronous			:1;
-	UCHAR Wide16Bit				:1;
-	UCHAR Wide32Bit				:1;
-	UCHAR RelativeAddressing	:1;
-    UCHAR VendorId[8];
-    UCHAR ProductId[16];
-    UCHAR ProductRevisionLevel[4];
-    UCHAR VendorSpecific[20];
-    UCHAR Reserved3[40];
-	}	INQUIRYDATA, *PINQUIRYDATA;
-#endif
-
-// IDE IDENTIFY data
-typedef struct _IDENTIFY_DATA
-	{
-    USHORT GeneralConfiguration;            // 00
-    USHORT NumberOfCylinders;               // 02
-    USHORT Reserved1;                       // 04
-    USHORT NumberOfHeads;                   // 06
-    USHORT UnformattedBytesPerTrack;        // 08
-    USHORT UnformattedBytesPerSector;       // 0A
-    USHORT SectorsPerTrack;                 // 0C
-    USHORT VendorUnique1[3];                // 0E
-    USHORT SerialNumber[10];                // 14
-    USHORT BufferType;                      // 28
-    USHORT BufferSectorSize;                // 2A
-    USHORT NumberOfEccBytes;                // 2C
-    USHORT FirmwareRevision[4];             // 2E
-    USHORT ModelNumber[20];                 // 36
-    UCHAR  MaximumBlockTransfer;            // 5E
-    UCHAR  VendorUnique2;                   // 5F
-    USHORT DoubleWordIo;                    // 60
-    USHORT Capabilities;                    // 62
-    USHORT Reserved2;                       // 64
-    UCHAR  VendorUnique3;                   // 66
-    UCHAR  PioCycleTimingMode;              // 67
-    UCHAR  VendorUnique4;                   // 68
-    UCHAR  DmaCycleTimingMode;              // 69
-    USHORT TranslationFieldsValid:1;        // 6A
-    USHORT Reserved3:15;
-    USHORT NumberOfCurrentCylinders;        // 6C
-    USHORT NumberOfCurrentHeads;            // 6E
-    USHORT CurrentSectorsPerTrack;          // 70
-    ULONG  CurrentSectorCapacity;           // 72
-    USHORT Reserved4[197];                  // 76
-	}	IDENTIFY_DATA, *PIDENTIFY_DATA;
-
-// Identify data without the Reserved4.
-typedef struct _IDENTIFY_DATA2 {
-    USHORT GeneralConfiguration;            // 00
-    USHORT NumberOfCylinders;               // 02
-    USHORT Reserved1;                       // 04
-    USHORT NumberOfHeads;                   // 06
-    USHORT UnformattedBytesPerTrack;        // 08
-    USHORT UnformattedBytesPerSector;       // 0A
-    USHORT SectorsPerTrack;                 // 0C
-    USHORT VendorUnique1[3];                // 0E
-    USHORT SerialNumber[10];                // 14
-    USHORT BufferType;                      // 28
-    USHORT BufferSectorSize;                // 2A
-    USHORT NumberOfEccBytes;                // 2C
-    USHORT FirmwareRevision[4];             // 2E
-    USHORT ModelNumber[20];                 // 36
-    UCHAR  MaximumBlockTransfer;            // 5E
-    UCHAR  VendorUnique2;                   // 5F
-    USHORT DoubleWordIo;                    // 60
-    USHORT Capabilities;                    // 62
-    USHORT Reserved2;                       // 64
-    UCHAR  VendorUnique3;                   // 66
-    UCHAR  PioCycleTimingMode;              // 67
-    UCHAR  VendorUnique4;                   // 68
-    UCHAR  DmaCycleTimingMode;              // 69
-	USHORT TranslationFieldsValid:1;     	// 6A
-    USHORT Reserved3:15;
-    USHORT NumberOfCurrentCylinders;        // 6C
-    USHORT NumberOfCurrentHeads;            // 6E
-    USHORT CurrentSectorsPerTrack;          // 70
-    ULONG  CurrentSectorCapacity;           // 72
-	}	IDENTIFY_DATA2, *PIDENTIFY_DATA2;
-
-#endif	// PSI_EIDE_SCSIOP
-
-// function prototypes
-int Psi240i_Command(struct scsi_cmnd *SCpnt);
-int Psi240i_Abort(struct scsi_cmnd *SCpnt);
-int Psi240i_Reset(struct scsi_cmnd *SCpnt, unsigned int flags);
-#endif
diff --git a/drivers/scsi/psi_chip.h b/drivers/scsi/psi_chip.h
deleted file mode 100644
index 224cf8f..0000000
--- a/drivers/scsi/psi_chip.h
+++ /dev/null
@@ -1,195 +0,0 @@
-/*+M*************************************************************************
- * Perceptive Solutions, Inc. PSI-240I device driver proc support for Linux.
- *
- * Copyright (c) 1997 Perceptive Solutions, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING.  If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- *
- *	File Name:	psi_chip.h
- *
- *	Description:	This file contains the interface defines and
- *					error codes.
- *
- *-M*************************************************************************/
-#ifndef PSI_CHIP
-#define PSI_CHIP
-
-/************************************************/
-/*		Misc konstants							*/
-/************************************************/
-#define	CHIP_MAXDRIVES			8
-
-/************************************************/
-/*		Chip I/O addresses						*/
-/************************************************/
-#define	CHIP_ADRS_0				0x0130
-#define	CHIP_ADRS_1				0x0150
-#define	CHIP_ADRS_2				0x0190
-#define	CHIP_ADRS_3				0x0210
-#define	CHIP_ADRS_4				0x0230
-#define	CHIP_ADRS_5				0x0250
-
-/************************************************/
-/*		EEPROM locations		*/
-/************************************************/
-#define	CHIP_EEPROM_BIOS		0x0000		// BIOS base address
-#define	CHIP_EEPROM_DATA		0x2000	   	// SETUP data base address
-#define	CHIP_EEPROM_FACTORY		0x2400	   	// FACTORY data base address
-#define	CHIP_EEPROM_SETUP		0x3000	   	// SETUP PROGRAM base address
-
-#define	CHIP_EEPROM_SIZE		32768U	   	// size of the entire EEPROM
-#define	CHIP_EEPROM_BIOS_SIZE	8192	   	// size of the BIOS in bytes
-#define	CHIP_EEPROM_DATA_SIZE	4096	   	// size of factory, setup, log data block in bytes
-#define	CHIP_EEPROM_SETUP_SIZE	20480U	   	// size of the setup program in bytes
-
-/************************************************/
-/*		Chip Interrupts							*/
-/************************************************/
-#define	CHIP_IRQ_10				0x72
-#define	CHIP_IRQ_11				0x73
-#define	CHIP_IRQ_12				0x74
-
-/************************************************/
-/*		Chip Setup addresses		*/
-/************************************************/
-#define	CHIP_SETUP_BASE			0x0000C000L
-
-/************************************************/
-/*		Chip Register address offsets	*/
-/************************************************/
-#define	REG_DATA				0x00
-#define	REG_ERROR				0x01
-#define	REG_SECTOR_COUNT		0x02
-#define	REG_LBA_0				0x03
-#define	REG_LBA_8				0x04
-#define	REG_LBA_16				0x05
-#define	REG_LBA_24				0x06
-#define	REG_STAT_CMD			0x07
-#define	REG_SEL_FAIL			0x08
-#define	REG_IRQ_STATUS			0x09
-#define	REG_ADDRESS				0x0A
-#define	REG_FAIL				0x0C
-#define	REG_ALT_STAT		   	0x0E
-#define	REG_DRIVE_ADRS			0x0F
-
-/************************************************/
-/*		Chip RAM locations		*/
-/************************************************/
-#define	CHIP_DEVICE				0x8000
-#define	CHIP_DEVICE_0			0x8000
-#define CHIP_DEVICE_1			0x8008
-#define	CHIP_DEVICE_2			0x8010
-#define	CHIP_DEVICE_3			0x8018
-#define	CHIP_DEVICE_4			0x8020
-#define	CHIP_DEVICE_5			0x8028
-#define	CHIP_DEVICE_6			0x8030
-#define	CHIP_DEVICE_7			0x8038
-typedef struct
-	{
-	UCHAR	channel;		// channel of this device (0-8).
-	UCHAR	spt;			// Sectors Per Track.
-	ULONG	spc;			// Sectors Per Cylinder.
-	}	CHIP_DEVICE_N;
-
-#define	CHIP_CONFIG				0x8100		// address of boards configuration.
-typedef struct
-	{
-	UCHAR		irq;			// interrupt request channel number
-	UCHAR		numDrives;		// Number of accessible drives
-	UCHAR		fastFormat;	 	// Boolean for fast format enable
-	}	CHIP_CONFIG_N;
-
-#define	CHIP_MAP				0x8108 		// eight byte device type map.
-
-
-#define	CHIP_RAID				0x8120 		// array of RAID signature structures and LBA
-#define	CHIP_RAID_1				0x8120
-#define CHIP_RAID_2				0x8130
-#define	CHIP_RAID_3				0x8140
-#define	CHIP_RAID_4				0x8150
-
-/************************************************/
-/*		Chip Register Masks		*/
-/************************************************/
-#define	CHIP_ID					0x7B
-#define	SEL_RAM					0x8000
-#define	MASK_FAIL				0x80
-
-/************************************************/
-/*		Chip cable select bits		*/
-/************************************************/
-#define	SECTORSXFER				8
-
-/************************************************/
-/*		Chip cable select bits		*/
-/************************************************/
-#define	SEL_NONE				0x00
-#define	SEL_1					0x01
-#define	SEL_2					0x02
-#define	SEL_3					0x04
-#define	SEL_4					0x08
-
-/************************************************/
-/*		Programmable Interrupt Controller*/
-/************************************************/
-#define	PIC1					0x20		// first 8259 base port address
-#define	PIC2					0xA0		// second 8259 base port address
-#define	INT_OCW1				1			// Operation Control Word 1: IRQ mask
-#define	EOI						0x20		// non-specific end-of-interrupt
-
-/************************************************/
-/*		Device/Geometry controls				*/
-/************************************************/
-#define GEOMETRY_NONE		 	0x0			// No device
-#define GEOMETRY_AUTO			0x1			// Geometry set automatically
-#define GEOMETRY_USER		 	0x2			// User supplied geometry
-
-#define	DEVICE_NONE				0x0			// No device present
-#define	DEVICE_INACTIVE			0x1			// device present but not registered active
-#define	DEVICE_ATAPI			0x2			// ATAPI device (CD_ROM, Tape, Etc...)
-#define	DEVICE_DASD_NONLBA		0x3			// Non LBA incompatible device
-#define	DEVICE_DASD_LBA			0x4			// LBA compatible device
-
-/************************************************/
-/*		Setup Structure Definitions	*/
-/************************************************/
-typedef struct							// device setup parameters
-	{
-	UCHAR			geometryControl;	// geometry control flags
-	UCHAR		   	device;				// device code
-	USHORT			sectors;			// number of sectors per track
-	USHORT			heads;				// number of heads
-	USHORT			cylinders;			// number of cylinders for this device
-	ULONG			blocks;				// number of blocks on device
-	USHORT			spare1;
-	USHORT			spare2;
-	} SETUP_DEVICE, *PSETUP_DEVICE;
-
-typedef struct		// master setup structure
-	{
-	USHORT 			startupDelay;
-	USHORT 			promptBIOS;
-	USHORT 			fastFormat;
-	USHORT			spare2;
-	USHORT			spare3;
-	USHORT			spare4;
-	USHORT			spare5;
-	USHORT			spare6;
-	SETUP_DEVICE	setupDevice[8];
-	}	SETUP, *PSETUP;
-
-#endif
-
-- 
1.5.3.1

[PATCH 26/32] Remove of seagate.c driver

[Boaz Harrosh]

  - Apparently no one wonts this driver, and no one
    is willing to fix it for future changes to SCSI.
    So remove it, and if someone wants it in the future
    He can revive it with the needed fixes.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/Kconfig   |   15 -
 drivers/scsi/Makefile  |    2 -
 drivers/scsi/seagate.c | 1667 ------------------------------------------------
 3 files changed, 0 insertions(+), 1684 deletions(-)
 delete mode 100644 drivers/scsi/seagate.c

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 0480f6b..4afb65b 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1348,21 +1348,6 @@ config SCSI_LPFC
           This lpfc driver supports the Emulex LightPulse
           Family of Fibre Channel PCI host adapters.
 
-config SCSI_SEAGATE
-	tristate "Seagate ST-02 and Future Domain TMC-8xx SCSI support"
-	depends on X86 && ISA && SCSI
-	select CHECK_SIGNATURE
-	---help---
-	  These are 8-bit SCSI controllers; the ST-01 is also supported by
-	  this driver.  It is explained in section 3.9 of the SCSI-HOWTO,
-	  available from <http://www.tldp.org/docs.html#howto>.  If it
-	  doesn't work out of the box, you may have to change some macros at
-	  compiletime, which are described in <file:drivers/scsi/seagate.c>.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called seagate.
-
-# definitely looks not 64bit safe:
 config SCSI_SIM710
 	tristate "Simple 53c710 SCSI support (Compaq, NCR machines)"
 	depends on (EISA || MCA) && SCSI
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index ffb800d..56db32a 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -16,7 +16,6 @@
 
 CFLAGS_aha152x.o =   -DAHA152X_STAT -DAUTOCONF
 CFLAGS_gdth.o    = # -DDEBUG_GDTH=2 -D__SERIAL__ -D__COM2__ -DGDTH_STATISTICS
-CFLAGS_seagate.o =   -DARBITRATE -DPARITY -DSEAGATE_USE_ASM
 
 subdir-$(CONFIG_PCMCIA)		+= pcmcia
 
@@ -89,7 +88,6 @@ obj-$(CONFIG_SCSI_QLA_FC)	+= qla2xxx/
 obj-$(CONFIG_SCSI_QLA_ISCSI)	+= qla4xxx/
 obj-$(CONFIG_SCSI_LPFC)		+= lpfc/
 obj-$(CONFIG_SCSI_PAS16)	+= pas16.o
-obj-$(CONFIG_SCSI_SEAGATE)	+= seagate.o
 obj-$(CONFIG_SCSI_T128)		+= t128.o
 obj-$(CONFIG_SCSI_DMX3191D)	+= dmx3191d.o
 obj-$(CONFIG_SCSI_DTC3280)	+= dtc.o
diff --git a/drivers/scsi/seagate.c b/drivers/scsi/seagate.c
deleted file mode 100644
index ce80fa9..0000000
--- a/drivers/scsi/seagate.c
+++ /dev/null
@@ -1,1667 +0,0 @@
-/*
- *    seagate.c Copyright (C) 1992, 1993 Drew Eckhardt
- *      low level scsi driver for ST01/ST02, Future Domain TMC-885,
- *      TMC-950 by Drew Eckhardt <drew@colorado.edu>
- *
- *      Note : TMC-880 boards don't work because they have two bits in
- *              the status register flipped, I'll fix this "RSN"
- *	[why do I have strong feeling that above message is from 1993? :-)
- *	        pavel@ucw.cz]
- *
- *      This card does all the I/O via memory mapped I/O, so there is no need
- *      to check or allocate a region of the I/O address space.
- */
-
-/* 1996 - to use new read{b,w,l}, write{b,w,l}, and phys_to_virt
- * macros, replaced assembler routines with C. There's probably a
- * performance hit, but I only have a cdrom and can't tell. Define
- * SEAGATE_USE_ASM if you want the old assembler code -- SJT
- *
- * 1998-jul-29 - created DPRINTK macros and made it work under 
- * linux 2.1.112, simplified some #defines etc. <pavel@ucw.cz>
- *
- * Aug 2000 - aeb - deleted seagate_st0x_biosparam(). It would try to
- * read the physical disk geometry, a bad mistake. Of course it doesn't
- * matter much what geometry one invents, but on large disks it
- * returned 256 (or more) heads, causing all kind of failures.
- * Of course this means that people might see a different geometry now,
- * so boot parameters may be necessary in some cases.
- */
-
-/*
- * Configuration :
- * To use without BIOS -DOVERRIDE=base_address -DCONTROLLER=FD or SEAGATE
- * -DIRQ will override the default of 5.
- * Note: You can now set these options from the kernel's "command line".
- * The syntax is:
- *
- *     st0x=ADDRESS,IRQ                (for a Seagate controller)
- * or:
- *     tmc8xx=ADDRESS,IRQ              (for a TMC-8xx or TMC-950 controller)
- * eg:
- *     tmc8xx=0xC8000,15
- *
- * will configure the driver for a TMC-8xx style controller using IRQ 15
- * with a base address of 0xC8000.
- *
- * -DARBITRATE 
- *      Will cause the host adapter to arbitrate for the
- *      bus for better SCSI-II compatibility, rather than just
- *      waiting for BUS FREE and then doing its thing.  Should
- *      let us do one command per Lun when I integrate my
- *      reorganization changes into the distribution sources.
- *
- * -DDEBUG=65535
- *      Will activate debug code.
- *
- * -DFAST or -DFAST32 
- *      Will use blind transfers where possible
- *
- * -DPARITY  
- *      This will enable parity.
- *
- * -DSEAGATE_USE_ASM
- *      Will use older seagate assembly code. should be (very small amount)
- *      Faster.
- *
- * -DSLOW_RATE=50
- *      Will allow compatibility with broken devices that don't
- *      handshake fast enough (ie, some CD ROM's) for the Seagate
- *      code.
- *
- *      50 is some number, It will let you specify a default
- *      transfer rate if handshaking isn't working correctly.
- *
- * -DOLDCNTDATASCEME  There is a new sceme to set the CONTROL
- *                    and DATA reigsters which complies more closely
- *                    with the SCSI2 standard. This hopefully eliminates
- *                    the need to swap the order these registers are
- *                    'messed' with. It makes the following two options
- *                    obsolete. To reenable the old sceme define this.
- *
- * The following to options are patches from the SCSI.HOWTO
- *
- * -DSWAPSTAT  This will swap the definitions for STAT_MSG and STAT_CD.
- *
- * -DSWAPCNTDATA  This will swap the order that seagate.c messes with
- *                the CONTROL an DATA registers.
- */
-
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/spinlock.h>
-#include <linux/signal.h>
-#include <linux/string.h>
-#include <linux/proc_fs.h>
-#include <linux/init.h>
-#include <linux/blkdev.h>
-#include <linux/stat.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-
-#include <asm/system.h>
-#include <asm/uaccess.h>
-
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi.h>
-
-#include <scsi/scsi_dbg.h>
-#include <scsi/scsi_host.h>
-
-
-#ifdef DEBUG
-#define DPRINTK( when, msg... ) do { if ( (DEBUG & (when)) == (when) ) printk( msg ); } while (0)
-#else
-#define DPRINTK( when, msg... ) do { } while (0)
-#define DEBUG 0
-#endif
-#define DANY( msg... ) DPRINTK( 0xffff, msg );
-
-#ifndef IRQ
-#define IRQ 5
-#endif
-
-#ifdef FAST32
-#define FAST
-#endif
-
-#undef LINKED			/* Linked commands are currently broken! */
-
-#if defined(OVERRIDE) && !defined(CONTROLLER)
-#error Please use -DCONTROLLER=SEAGATE or -DCONTROLLER=FD to override controller type
-#endif
-
-#ifndef __i386__
-#undef SEAGATE_USE_ASM
-#endif
-
-/*
-	Thanks to Brian Antoine for the example code in his Messy-Loss ST-01
-		driver, and Mitsugu Suzuki for information on the ST-01
-		SCSI host.
-*/
-
-/*
-	CONTROL defines
-*/
-
-#define CMD_RST 		0x01
-#define CMD_SEL 		0x02
-#define CMD_BSY 		0x04
-#define CMD_ATTN    		0x08
-#define CMD_START_ARB		0x10
-#define CMD_EN_PARITY		0x20
-#define CMD_INTR		0x40
-#define CMD_DRVR_ENABLE		0x80
-
-/*
-	STATUS
-*/
-#ifdef SWAPSTAT
-#define STAT_MSG		0x08
-#define STAT_CD			0x02
-#else
-#define STAT_MSG		0x02
-#define STAT_CD			0x08
-#endif
-
-#define STAT_BSY		0x01
-#define STAT_IO			0x04
-#define STAT_REQ		0x10
-#define STAT_SEL		0x20
-#define STAT_PARITY		0x40
-#define STAT_ARB_CMPL		0x80
-
-/* 
-	REQUESTS
-*/
-
-#define REQ_MASK (STAT_CD |  STAT_IO | STAT_MSG)
-#define REQ_DATAOUT 0
-#define REQ_DATAIN STAT_IO
-#define REQ_CMDOUT STAT_CD
-#define REQ_STATIN (STAT_CD | STAT_IO)
-#define REQ_MSGOUT (STAT_MSG | STAT_CD)
-#define REQ_MSGIN (STAT_MSG | STAT_CD | STAT_IO)
-
-extern volatile int seagate_st0x_timeout;
-
-#ifdef PARITY
-#define BASE_CMD CMD_EN_PARITY
-#else
-#define BASE_CMD  0
-#endif
-
-/*
-	Debugging code
-*/
-
-#define PHASE_BUS_FREE 1
-#define PHASE_ARBITRATION 2
-#define PHASE_SELECTION 4
-#define PHASE_DATAIN 8
-#define PHASE_DATAOUT 0x10
-#define PHASE_CMDOUT 0x20
-#define PHASE_MSGIN 0x40
-#define PHASE_MSGOUT 0x80
-#define PHASE_STATUSIN 0x100
-#define PHASE_ETC (PHASE_DATAIN | PHASE_DATAOUT | PHASE_CMDOUT | PHASE_MSGIN | PHASE_MSGOUT | PHASE_STATUSIN)
-#define PRINT_COMMAND 0x200
-#define PHASE_EXIT 0x400
-#define PHASE_RESELECT 0x800
-#define DEBUG_FAST 0x1000
-#define DEBUG_SG   0x2000
-#define DEBUG_LINKED	0x4000
-#define DEBUG_BORKEN	0x8000
-
-/* 
- *	Control options - these are timeouts specified in .01 seconds.
- */
-
-/* 30, 20 work */
-#define ST0X_BUS_FREE_DELAY 25
-#define ST0X_SELECTION_DELAY 25
-
-#define SEAGATE 1		/* these determine the type of the controller */
-#define FD	2
-
-#define ST0X_ID_STR	"Seagate ST-01/ST-02"
-#define FD_ID_STR	"TMC-8XX/TMC-950"
-
-static int internal_command (unsigned char target, unsigned char lun,
-			     const void *cmnd,
-			     void *buff, int bufflen, int reselect);
-
-static int incommand;		/* set if arbitration has finished
-				   and we are in some command phase. */
-
-static unsigned int base_address = 0;	/* Where the card ROM starts, used to 
-					   calculate memory mapped register
-					   location.  */
-
-static void __iomem *st0x_cr_sr;	/* control register write, status
-					   register read.  256 bytes in
-					   length.
-					   Read is status of SCSI BUS, as per 
-					   STAT masks.  */
-
-static void __iomem *st0x_dr;	/* data register, read write 256
-				   bytes in length.  */
-
-static volatile int st0x_aborted = 0;	/* set when we are aborted, ie by a
-					   time out, etc.  */
-
-static unsigned char controller_type = 0;	/* set to SEAGATE for ST0x
-						   boards or FD for TMC-8xx
-						   boards */
-static int irq = IRQ;
-
-module_param(base_address, uint, 0);
-module_param(controller_type, byte, 0);
-module_param(irq, int, 0);
-MODULE_LICENSE("GPL");
-
-
-#define retcode(result) (((result) << 16) | (message << 8) | status)
-#define STATUS ((u8) readb(st0x_cr_sr))
-#define DATA ((u8) readb(st0x_dr))
-#define WRITE_CONTROL(d) { writeb((d), st0x_cr_sr); }
-#define WRITE_DATA(d) { writeb((d), st0x_dr); }
-
-#ifndef OVERRIDE
-static unsigned int seagate_bases[] = {
-	0xc8000, 0xca000, 0xcc000,
-	0xce000, 0xdc000, 0xde000
-};
-
-typedef struct {
-	const unsigned char *signature;
-	unsigned offset;
-	unsigned length;
-	unsigned char type;
-} Signature;
-
-static Signature __initdata signatures[] = {
-	{"ST01 v1.7  (C) Copyright 1987 Seagate", 15, 37, SEAGATE},
-	{"SCSI BIOS 2.00  (C) Copyright 1987 Seagate", 15, 40, SEAGATE},
-
-/*
- * The following two lines are NOT mistakes.  One detects ROM revision
- * 3.0.0, the other 3.2.  Since seagate has only one type of SCSI adapter,
- * and this is not going to change, the "SEAGATE" and "SCSI" together
- * are probably "good enough"
- */
-
-	{"SEAGATE SCSI BIOS ", 16, 17, SEAGATE},
-	{"SEAGATE SCSI BIOS ", 17, 17, SEAGATE},
-
-/*
- * However, future domain makes several incompatible SCSI boards, so specific
- * signatures must be used.
- */
-
-	{"FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89", 5, 46, FD},
-	{"FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89", 5, 46, FD},
-	{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90", 5, 47, FD},
-	{"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90", 5, 47, FD},
-	{"FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90", 5, 46, FD},
-	{"FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92", 5, 44, FD},
-	{"IBM F1 BIOS V1.1004/30/92", 5, 25, FD},
-	{"FUTURE DOMAIN TMC-950", 5, 21, FD},
-	/* Added for 2.2.16 by Matthias_Heidbrink@b.maus.de */
-	{"IBM F1 V1.2009/22/93", 5, 25, FD},
-};
-
-#define NUM_SIGNATURES ARRAY_SIZE(signatures)
-#endif				/* n OVERRIDE */
-
-/*
- * hostno stores the hostnumber, as told to us by the init routine.
- */
-
-static int hostno = -1;
-static void seagate_reconnect_intr (int, void *);
-static irqreturn_t do_seagate_reconnect_intr (int, void *);
-static int seagate_st0x_bus_reset(struct scsi_cmnd *);
-
-#ifdef FAST
-static int fast = 1;
-#else
-#define fast 0
-#endif
-
-#ifdef SLOW_RATE
-/*
- * Support for broken devices :
- * The Seagate board has a handshaking problem.  Namely, a lack
- * thereof for slow devices.  You can blast 600K/second through
- * it if you are polling for each byte, more if you do a blind
- * transfer.  In the first case, with a fast device, REQ will
- * transition high-low or high-low-high before your loop restarts
- * and you'll have no problems.  In the second case, the board
- * will insert wait states for up to 13.2 usecs for REQ to
- * transition low->high, and everything will work.
- *
- * However, there's nothing in the state machine that says
- * you *HAVE* to see a high-low-high set of transitions before
- * sending the next byte, and slow things like the Trantor CD ROMS
- * will break because of this.
- *
- * So, we need to slow things down, which isn't as simple as it
- * seems.  We can't slow things down period, because then people
- * who don't recompile their kernels will shoot me for ruining
- * their performance.  We need to do it on a case per case basis.
- *
- * The best for performance will be to, only for borken devices
- * (this is stored on a per-target basis in the scsi_devices array)
- *
- * Wait for a low->high transition before continuing with that
- * transfer.  If we timeout, continue anyways.  We don't need
- * a long timeout, because REQ should only be asserted until the
- * corresponding ACK is received and processed.
- *
- * Note that we can't use the system timer for this, because of
- * resolution, and we *really* can't use the timer chip since
- * gettimeofday() and the beeper routines use that.  So,
- * the best thing for us to do will be to calibrate a timing
- * loop in the initialization code using the timer chip before
- * gettimeofday() can screw with it.
- *
- * FIXME: this is broken (not borken :-). Empty loop costs less than
- * loop with ISA access in it! -- pavel@ucw.cz
- */
-
-static int borken_calibration = 0;
-
-static void __init borken_init (void)
-{
-	register int count = 0, start = jiffies + 1, stop = start + 25;
-
-	/* FIXME: There may be a better approach, this is a straight port for
-	   now */
-	preempt_disable();
-	while (time_before (jiffies, start))
-		cpu_relax();
-	for (; time_before (jiffies, stop); ++count)
-		cpu_relax();
-	preempt_enable();
-
-/*
- * Ok, we now have a count for .25 seconds.  Convert to a
- * count per second and divide by transfer rate in K.  */
-
-	borken_calibration = (count * 4) / (SLOW_RATE * 1024);
-
-	if (borken_calibration < 1)
-		borken_calibration = 1;
-}
-
-static inline void borken_wait (void)
-{
-	register int count;
-
-	for (count = borken_calibration; count && (STATUS & STAT_REQ); --count)
-		cpu_relax();
-	     	
-#if (DEBUG & DEBUG_BORKEN)
-	if (count)
-		printk ("scsi%d : borken timeout\n", hostno);
-#endif
-}
-
-#endif				/* def SLOW_RATE */
-
-/* These beasts only live on ISA, and ISA means 8MHz. Each ULOOP()
- * contains at least one ISA access, which takes more than 0.125
- * usec. So if we loop 8 times time in usec, we are safe.
- */
-
-#define ULOOP( i ) for (clock = i*8;;)
-#define TIMEOUT (!(clock--))
-
-static int __init seagate_st0x_detect (struct scsi_host_template * tpnt)
-{
-	struct Scsi_Host *instance;
-	int i, j;
-	unsigned long cr, dr;
-
-	tpnt->proc_name = "seagate";
-/*
- *	First, we try for the manual override.
- */
-	DANY ("Autodetecting ST0x / TMC-8xx\n");
-
-	if (hostno != -1) {
-		printk (KERN_ERR "seagate_st0x_detect() called twice?!\n");
-		return 0;
-	}
-
-/* If the user specified the controller type from the command line,
-   controller_type will be non-zero, so don't try to detect one */
-
-	if (!controller_type) {
-#ifdef OVERRIDE
-		base_address = OVERRIDE;
-		controller_type = CONTROLLER;
-
-		DANY ("Base address overridden to %x, controller type is %s\n",
-		      base_address,
-		      controller_type == SEAGATE ? "SEAGATE" : "FD");
-#else				/* OVERRIDE */
-/*
- * 	To detect this card, we simply look for the signature
- *      from the BIOS version notice in all the possible locations
- *      of the ROM's.  This has a nice side effect of not trashing
- *      any register locations that might be used by something else.
- *
- * XXX - note that we probably should be probing the address
- * space for the on-board RAM instead.
- */
-
-		for (i = 0; i < ARRAY_SIZE(seagate_bases); ++i) {
-			void __iomem *p = ioremap(seagate_bases[i], 0x2000);
-			if (!p)
-				continue;
-			for (j = 0; j < NUM_SIGNATURES; ++j)
-				if (check_signature(p + signatures[j].offset, signatures[j].signature, signatures[j].length)) {
-					base_address = seagate_bases[i];
-					controller_type = signatures[j].type;
-					break;
-				}
-			iounmap(p);
-		}
-#endif				/* OVERRIDE */
-	}
-	/* (! controller_type) */
-	tpnt->this_id = (controller_type == SEAGATE) ? 7 : 6;
-	tpnt->name = (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR;
-
-	if (!base_address) {
-		printk(KERN_INFO "seagate: ST0x/TMC-8xx not detected.\n");
-		return 0;
-	}
-
-	cr = base_address + (controller_type == SEAGATE ? 0x1a00 : 0x1c00);
-	dr = cr + 0x200;
-	st0x_cr_sr = ioremap(cr, 0x100);
-	st0x_dr = ioremap(dr, 0x100);
-
-	DANY("%s detected. Base address = %x, cr = %x, dr = %x\n",
-	      tpnt->name, base_address, cr, dr);
-
-	/*
-	 *	At all times, we will use IRQ 5.  Should also check for IRQ3
-	 *	if we lose our first interrupt.
-	 */
-	instance = scsi_register (tpnt, 0);
-	if (instance == NULL)
-		return 0;
-
-	hostno = instance->host_no;
-	if (request_irq (irq, do_seagate_reconnect_intr, IRQF_DISABLED, (controller_type == SEAGATE) ? "seagate" : "tmc-8xx", instance)) {
-		printk(KERN_ERR "scsi%d : unable to allocate IRQ%d\n", hostno, irq);
-		return 0;
-	}
-	instance->irq = irq;
-	instance->io_port = base_address;
-#ifdef SLOW_RATE
-	printk(KERN_INFO "Calibrating borken timer... ");
-	borken_init();
-	printk(" %d cycles per transfer\n", borken_calibration);
-#endif
-	printk (KERN_INFO "This is one second... ");
-	{
-		int clock;
-		ULOOP (1 * 1000 * 1000) {
-			STATUS;
-			if (TIMEOUT)
-				break;
-		}
-	}
-
-	printk ("done, %s options:"
-#ifdef ARBITRATE
-		" ARBITRATE"
-#endif
-#if DEBUG
-		" DEBUG"
-#endif
-#ifdef FAST
-		" FAST"
-#ifdef FAST32
-		"32"
-#endif
-#endif
-#ifdef LINKED
-		" LINKED"
-#endif
-#ifdef PARITY
-		" PARITY"
-#endif
-#ifdef SEAGATE_USE_ASM
-		" SEAGATE_USE_ASM"
-#endif
-#ifdef SLOW_RATE
-		" SLOW_RATE"
-#endif
-#ifdef SWAPSTAT
-		" SWAPSTAT"
-#endif
-#ifdef SWAPCNTDATA
-		" SWAPCNTDATA"
-#endif
-		"\n", tpnt->name);
-	return 1;
-}
-
-static const char *seagate_st0x_info (struct Scsi_Host *shpnt)
-{
-	static char buffer[64];
-
-	snprintf(buffer, 64, "%s at irq %d, address 0x%05X",
-		 (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR,
-		 irq, base_address);
-	return buffer;
-}
-
-/*
- * These are our saved pointers for the outstanding command that is
- * waiting for a reconnect
- */
-
-static unsigned char current_target, current_lun;
-static unsigned char *current_cmnd, *current_data;
-static int current_nobuffs;
-static struct scatterlist *current_buffer;
-static int current_bufflen;
-
-#ifdef LINKED
-/*
- * linked_connected indicates whether or not we are currently connected to
- * linked_target, linked_lun and in an INFORMATION TRANSFER phase,
- * using linked commands.
- */
-
-static int linked_connected = 0;
-static unsigned char linked_target, linked_lun;
-#endif
-
-static void (*done_fn) (struct scsi_cmnd *) = NULL;
-static struct scsi_cmnd *SCint = NULL;
-
-/*
- * These control whether or not disconnect / reconnect will be attempted,
- * or are being attempted.
- */
-
-#define NO_RECONNECT    0
-#define RECONNECT_NOW   1
-#define CAN_RECONNECT   2
-
-/*
- * LINKED_RIGHT indicates that we are currently connected to the correct target
- * for this command, LINKED_WRONG indicates that we are connected to the wrong
- * target. Note that these imply CAN_RECONNECT and require defined(LINKED).
- */
-
-#define LINKED_RIGHT    3
-#define LINKED_WRONG    4
-
-/*
- * This determines if we are expecting to reconnect or not.
- */
-
-static int should_reconnect = 0;
-
-/*
- * The seagate_reconnect_intr routine is called when a target reselects the
- * host adapter.  This occurs on the interrupt triggered by the target
- * asserting SEL.
- */
-
-static irqreturn_t do_seagate_reconnect_intr(int irq, void *dev_id)
-{
-	unsigned long flags;
-	struct Scsi_Host *dev = dev_id;
-	
-	spin_lock_irqsave (dev->host_lock, flags);
-	seagate_reconnect_intr (irq, dev_id);
-	spin_unlock_irqrestore (dev->host_lock, flags);
-	return IRQ_HANDLED;
-}
-
-static void seagate_reconnect_intr (int irq, void *dev_id)
-{
-	int temp;
-	struct scsi_cmnd *SCtmp;
-
-	DPRINTK (PHASE_RESELECT, "scsi%d : seagate_reconnect_intr() called\n", hostno);
-
-	if (!should_reconnect)
-		printk(KERN_WARNING "scsi%d: unexpected interrupt.\n", hostno);
-	else {
-		should_reconnect = 0;
-
-		DPRINTK (PHASE_RESELECT, "scsi%d : internal_command(%d, %08x, %08x, RECONNECT_NOW\n", 
-			hostno, current_target, current_data, current_bufflen);
-
-		temp = internal_command (current_target, current_lun, current_cmnd, current_data, current_bufflen, RECONNECT_NOW);
-
-		if (msg_byte(temp) != DISCONNECT) {
-			if (done_fn) {
-				DPRINTK(PHASE_RESELECT, "scsi%d : done_fn(%d,%08x)", hostno, hostno, temp);
-				if (!SCint)
-					panic ("SCint == NULL in seagate");
-				SCtmp = SCint;
-				SCint = NULL;
-				SCtmp->result = temp;
-				done_fn(SCtmp);
-			} else
-				printk(KERN_ERR "done_fn() not defined.\n");
-		}
-	}
-}
-
-/*
- * The seagate_st0x_queue_command() function provides a queued interface
- * to the seagate SCSI driver.  Basically, it just passes control onto the
- * seagate_command() function, after fixing it so that the done_fn()
- * is set to the one passed to the function.  We have to be very careful,
- * because there are some commands on some devices that do not disconnect,
- * and if we simply call the done_fn when the command is done then another
- * command is started and queue_command is called again...  We end up
- * overflowing the kernel stack, and this tends not to be such a good idea.
- */
-
-static int recursion_depth = 0;
-
-static int seagate_st0x_queue_command(struct scsi_cmnd * SCpnt,
-				      void (*done) (struct scsi_cmnd *))
-{
-	int result, reconnect;
-	struct scsi_cmnd *SCtmp;
-
-	DANY ("seagate: que_command");
-	done_fn = done;
-	current_target = SCpnt->device->id;
-	current_lun = SCpnt->device->lun;
-	current_cmnd = SCpnt->cmnd;
-	current_data = (unsigned char *) SCpnt->request_buffer;
-	current_bufflen = SCpnt->request_bufflen;
-	SCint = SCpnt;
-	if (recursion_depth)
-		return 1;
-	recursion_depth++;
-	do {
-#ifdef LINKED
-		/*
-		 * Set linked command bit in control field of SCSI command.
-		 */
-
-		current_cmnd[SCpnt->cmd_len] |= 0x01;
-		if (linked_connected) {
-			DPRINTK (DEBUG_LINKED, "scsi%d : using linked commands, current I_T_L nexus is ", hostno);
-			if (linked_target == current_target && linked_lun == current_lun) 
-			{
-				DPRINTK(DEBUG_LINKED, "correct\n");
-				reconnect = LINKED_RIGHT;
-			} else {
-				DPRINTK(DEBUG_LINKED, "incorrect\n");
-				reconnect = LINKED_WRONG;
-			}
-		} else
-#endif				/* LINKED */
-			reconnect = CAN_RECONNECT;
-
-		result = internal_command(SCint->device->id, SCint->device->lun, SCint->cmnd,
-				      SCint->request_buffer, SCint->request_bufflen, reconnect);
-		if (msg_byte(result) == DISCONNECT)
-			break;
-		SCtmp = SCint;
-		SCint = NULL;
-		SCtmp->result = result;
-		done_fn(SCtmp);
-	}
-	while (SCint);
-	recursion_depth--;
-	return 0;
-}
-
-static int internal_command (unsigned char target, unsigned char lun,
-		  const void *cmnd, void *buff, int bufflen, int reselect)
-{
-	unsigned char *data = NULL;
-	struct scatterlist *buffer = NULL;
-	int clock, temp, nobuffs = 0, done = 0, len = 0;
-#if DEBUG
-	int transfered = 0, phase = 0, newphase;
-#endif
-	register unsigned char status_read;
-	unsigned char tmp_data, tmp_control, status = 0, message = 0;
-	unsigned transfersize = 0, underflow = 0;
-#ifdef SLOW_RATE
-	int borken = (int) SCint->device->borken;	/* Does the current target require
-							   Very Slow I/O ?  */
-#endif
-
-	incommand = 0;
-	st0x_aborted = 0;
-
-#if (DEBUG & PRINT_COMMAND)
-	printk("scsi%d : target = %d, command = ", hostno, target);
-	__scsi_print_command((unsigned char *) cmnd);
-#endif
-
-#if (DEBUG & PHASE_RESELECT)
-	switch (reselect) {
-	case RECONNECT_NOW:
-		printk("scsi%d : reconnecting\n", hostno);
-		break;
-#ifdef LINKED
-	case LINKED_RIGHT:
-		printk("scsi%d : connected, can reconnect\n", hostno);
-		break;
-	case LINKED_WRONG:
-		printk("scsi%d : connected to wrong target, can reconnect\n",
-			hostno);
-		break;
-#endif
-	case CAN_RECONNECT:
-		printk("scsi%d : allowed to reconnect\n", hostno);
-		break;
-	default:
-		printk("scsi%d : not allowed to reconnect\n", hostno);
-	}
-#endif
-
-	if (target == (controller_type == SEAGATE ? 7 : 6))
-		return DID_BAD_TARGET;
-
-	/*
-	 *	We work it differently depending on if this is is "the first time,"
-	 *      or a reconnect.  If this is a reselect phase, then SEL will
-	 *      be asserted, and we must skip selection / arbitration phases.
-	 */
-
-	switch (reselect) {
-	case RECONNECT_NOW:
-		DPRINTK (PHASE_RESELECT, "scsi%d : phase RESELECT \n", hostno);
-		/*
-		 *	At this point, we should find the logical or of our ID
-		 *	and the original target's ID on the BUS, with BSY, SEL,
-		 *	and I/O signals asserted.
-		 *
-		 *      After ARBITRATION phase is completed, only SEL, BSY,
-		 *	and the target ID are asserted.  A valid initiator ID
-		 *	is not on the bus until IO is asserted, so we must wait
-		 *	for that.
-		 */
-		ULOOP (100 * 1000) {
-			temp = STATUS;
-			if ((temp & STAT_IO) && !(temp & STAT_BSY))
-				break;
-			if (TIMEOUT) {
-				DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for IO .\n", hostno);
-				return (DID_BAD_INTR << 16);
-			}
-		}
-
-		/*
-		 *	After I/O is asserted by the target, we can read our ID
-		 *	and its ID off of the BUS.
-		 */
-
-		if (!((temp = DATA) & (controller_type == SEAGATE ? 0x80 : 0x40))) {
-			DPRINTK (PHASE_RESELECT, "scsi%d : detected reconnect request to different target.\n\tData bus = %d\n", hostno, temp);
-			return (DID_BAD_INTR << 16);
-		}
-
-		if (!(temp & (1 << current_target))) {
-			printk(KERN_WARNING "scsi%d : Unexpected reselect interrupt.  Data bus = %d\n", hostno, temp);
-			return (DID_BAD_INTR << 16);
-		}
-
-		buffer = current_buffer;
-		cmnd = current_cmnd;	/* WDE add */
-		data = current_data;	/* WDE add */
-		len = current_bufflen;	/* WDE add */
-		nobuffs = current_nobuffs;
-
-		/*
-		 *	We have determined that we have been selected.  At this
-		 *	point, we must respond to the reselection by asserting
-		 *	BSY ourselves
-		 */
-
-#if 1
-		WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | CMD_BSY);
-#else
-		WRITE_CONTROL (BASE_CMD | CMD_BSY);
-#endif
-
-		/*
-		 *	The target will drop SEL, and raise BSY, at which time
-		 *	we must drop BSY.
-		 */
-
-		ULOOP (100 * 1000) {
-			if (!(STATUS & STAT_SEL))
-				break;
-			if (TIMEOUT) {
-				WRITE_CONTROL (BASE_CMD | CMD_INTR);
-				DPRINTK (PHASE_RESELECT, "scsi%d : RESELECT timed out while waiting for SEL.\n", hostno);
-				return (DID_BAD_INTR << 16);
-			}
-		}
-		WRITE_CONTROL (BASE_CMD);
-		/*
-		 *	At this point, we have connected with the target
-		 *	and can get on with our lives.
-		 */
-		break;
-	case CAN_RECONNECT:
-#ifdef LINKED
-		/*
-		 * This is a bletcherous hack, just as bad as the Unix #!
-		 * interpreter stuff. If it turns out we are using the wrong
-		 * I_T_L nexus, the easiest way to deal with it is to go into
-		 *  our INFORMATION TRANSFER PHASE code, send a ABORT
-		 * message on MESSAGE OUT phase, and then loop back to here.
-		 */
-connect_loop:
-#endif
-		DPRINTK (PHASE_BUS_FREE, "scsi%d : phase = BUS FREE \n", hostno);
-
-		/*
-		 *    BUS FREE PHASE
-		 *
-		 *      On entry, we make sure that the BUS is in a BUS FREE
-		 *      phase, by insuring that both BSY and SEL are low for
-		 *      at least one bus settle delay.  Several reads help
-		 *      eliminate wire glitch.
-		 */
-
-#ifndef ARBITRATE
-#error FIXME: this is broken: we may not use jiffies here - we are under cli(). It will hardlock.
-		clock = jiffies + ST0X_BUS_FREE_DELAY;
-
-		while (((STATUS | STATUS | STATUS) & (STAT_BSY | STAT_SEL)) && (!st0x_aborted) && time_before (jiffies, clock))
-			cpu_relax();
-
-		if (time_after (jiffies, clock))
-			return retcode (DID_BUS_BUSY);
-		else if (st0x_aborted)
-			return retcode (st0x_aborted);
-#endif
-		DPRINTK (PHASE_SELECTION, "scsi%d : phase = SELECTION\n", hostno);
-
-		clock = jiffies + ST0X_SELECTION_DELAY;
-
-		/*
-		 * Arbitration/selection procedure :
-		 * 1.  Disable drivers
-		 * 2.  Write HOST adapter address bit
-		 * 3.  Set start arbitration.
-		 * 4.  We get either ARBITRATION COMPLETE or SELECT at this
-		 *     point.
-		 * 5.  OR our ID and targets on bus.
-		 * 6.  Enable SCSI drivers and asserted SEL and ATTN
-		 */
-
-#ifdef ARBITRATE
-		/* FIXME: verify host lock is always held here */
-		WRITE_CONTROL(0);
-		WRITE_DATA((controller_type == SEAGATE) ? 0x80 : 0x40);
-		WRITE_CONTROL(CMD_START_ARB);
-
-		ULOOP (ST0X_SELECTION_DELAY * 10000) {
-			status_read = STATUS;
-			if (status_read & STAT_ARB_CMPL)
-				break;
-			if (st0x_aborted)	/* FIXME: What? We are going to do something even after abort? */
-				break;
-			if (TIMEOUT || (status_read & STAT_SEL)) {
-				printk(KERN_WARNING "scsi%d : arbitration lost or timeout.\n", hostno);
-				WRITE_CONTROL (BASE_CMD);
-				return retcode (DID_NO_CONNECT);
-			}
-		}
-		DPRINTK (PHASE_SELECTION, "scsi%d : arbitration complete\n", hostno);
-#endif
-
-		/*
-		 *    When the SCSI device decides that we're gawking at it, 
-		 *    it will respond by asserting BUSY on the bus.
-		 *
-		 *    Note : the Seagate ST-01/02 product manual says that we
-		 *    should twiddle the DATA register before the control
-		 *    register. However, this does not work reliably so we do
-		 *    it the other way around.
-		 *
-		 *    Probably could be a problem with arbitration too, we
-		 *    really should try this with a SCSI protocol or logic 
-		 *    analyzer to see what is going on.
-		 */
-		tmp_data = (unsigned char) ((1 << target) | (controller_type == SEAGATE ? 0x80 : 0x40));
-		tmp_control = BASE_CMD | CMD_DRVR_ENABLE | CMD_SEL | (reselect ? CMD_ATTN : 0);
-
-		/* FIXME: verify host lock is always held here */
-#ifdef OLDCNTDATASCEME
-#ifdef SWAPCNTDATA
-		WRITE_CONTROL (tmp_control);
-		WRITE_DATA (tmp_data);
-#else
-		WRITE_DATA (tmp_data);
-		WRITE_CONTROL (tmp_control);
-#endif
-#else
-		tmp_control ^= CMD_BSY;	/* This is guesswork. What used to be in driver    */
-		WRITE_CONTROL (tmp_control);	/* could never work: it sent data into control     */
-		WRITE_DATA (tmp_data);	/* register and control info into data. Hopefully  */
-		tmp_control ^= CMD_BSY;	/* fixed, but order of first two may be wrong.     */
-		WRITE_CONTROL (tmp_control);	/* -- pavel@ucw.cz   */
-#endif
-
-		ULOOP (250 * 1000) {
-			if (st0x_aborted) {
-				/*
-				 *	If we have been aborted, and we have a
-				 *	command in progress, IE the target 
-				 *	still has BSY asserted, then we will
-				 *	reset the bus, and notify the midlevel
-				 *	driver to expect sense.
-				 */
-
-				WRITE_CONTROL (BASE_CMD);
-				if (STATUS & STAT_BSY) {
-					printk(KERN_WARNING "scsi%d : BST asserted after we've been aborted.\n", hostno);
-					seagate_st0x_bus_reset(NULL);
-					return retcode (DID_RESET);
-				}
-				return retcode (st0x_aborted);
-			}
-			if (STATUS & STAT_BSY)
-				break;
-			if (TIMEOUT) {
-				DPRINTK (PHASE_SELECTION, "scsi%d : NO CONNECT with target %d, stat = %x \n", hostno, target, STATUS);
-				return retcode (DID_NO_CONNECT);
-			}
-		}
-
-		/* Establish current pointers.  Take into account scatter / gather */
-
-		if ((nobuffs = SCint->use_sg)) {
-#if (DEBUG & DEBUG_SG)
-			{
-				int i;
-				printk("scsi%d : scatter gather requested, using %d buffers.\n", hostno, nobuffs);
-				for (i = 0; i < nobuffs; ++i)
-					printk("scsi%d : buffer %d address = %p length = %d\n",
-					     hostno, i,
-					     page_address(buffer[i].page) + buffer[i].offset,
-					     buffer[i].length);
-			}
-#endif
-
-			buffer = (struct scatterlist *) SCint->request_buffer;
-			len = buffer->length;
-			data = page_address(buffer->page) + buffer->offset;
-		} else {
-			DPRINTK (DEBUG_SG, "scsi%d : scatter gather not requested.\n", hostno);
-			buffer = NULL;
-			len = SCint->request_bufflen;
-			data = (unsigned char *) SCint->request_buffer;
-		}
-
-		DPRINTK (PHASE_DATAIN | PHASE_DATAOUT, "scsi%d : len = %d\n",
-			 hostno, len);
-
-		break;
-#ifdef LINKED
-	case LINKED_RIGHT:
-		break;
-	case LINKED_WRONG:
-		break;
-#endif
-	}			/* end of switch(reselect) */
-
-	/*
-	 *    There are several conditions under which we wish to send a message :
-	 *      1.  When we are allowing disconnect / reconnect, and need to
-	 *	establish the I_T_L nexus via an IDENTIFY with the DiscPriv bit
-	 *	set.
-	 *
-	 *      2.  When we are doing linked commands, are have the wrong I_T_L
-	 *	nexus established and want to send an ABORT message.
-	 */
-
-	/* GCC does not like an ifdef inside a macro, so do it the hard way. */
-#ifdef LINKED
-	WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT)|| (reselect == LINKED_WRONG))? CMD_ATTN : 0));
-#else
-	WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE | (((reselect == CAN_RECONNECT))? CMD_ATTN : 0));
-#endif
-
-	/*
-	 *    INFORMATION TRANSFER PHASE
-	 *
-	 *      The nasty looking read / write inline assembler loops we use for
-	 *      DATAIN and DATAOUT phases are approximately 4-5 times as fast as
-	 *      the 'C' versions - since we're moving 1024 bytes of data, this
-	 *      really adds up.
-	 *
-	 *      SJT: The nasty-looking assembler is gone, so it's slower.
-	 *
-	 */
-
-	DPRINTK (PHASE_ETC, "scsi%d : phase = INFORMATION TRANSFER\n", hostno);
-
-	incommand = 1;
-	transfersize = SCint->transfersize;
-	underflow = SCint->underflow;
-
-	/*
-	 *	Now, we poll the device for status information,
-	 *      and handle any requests it makes.  Note that since we are unsure
-	 *	of how much data will be flowing across the system, etc and
-	 *	cannot make reasonable timeouts, that we will instead have the
-	 *	midlevel driver handle any timeouts that occur in this phase.
-	 */
-
-	while (((status_read = STATUS) & STAT_BSY) && !st0x_aborted && !done) {
-#ifdef PARITY
-		if (status_read & STAT_PARITY) {
-			printk(KERN_ERR "scsi%d : got parity error\n", hostno);
-			st0x_aborted = DID_PARITY;
-		}
-#endif
-		if (status_read & STAT_REQ) {
-#if ((DEBUG & PHASE_ETC) == PHASE_ETC)
-			if ((newphase = (status_read & REQ_MASK)) != phase) {
-				phase = newphase;
-				switch (phase) {
-				case REQ_DATAOUT:
-					printk ("scsi%d : phase = DATA OUT\n", hostno);
-					break;
-				case REQ_DATAIN:
-					printk ("scsi%d : phase = DATA IN\n", hostno);
-					break;
-				case REQ_CMDOUT:
-					printk
-					    ("scsi%d : phase = COMMAND OUT\n", hostno);
-					break;
-				case REQ_STATIN:
-					printk ("scsi%d : phase = STATUS IN\n",	hostno);
-					break;
-				case REQ_MSGOUT:
-					printk
-					    ("scsi%d : phase = MESSAGE OUT\n", hostno);
-					break;
-				case REQ_MSGIN:
-					printk ("scsi%d : phase = MESSAGE IN\n", hostno);
-					break;
-				default:
-					printk ("scsi%d : phase = UNKNOWN\n", hostno);
-					st0x_aborted = DID_ERROR;
-				}
-			}
-#endif
-			switch (status_read & REQ_MASK) {
-			case REQ_DATAOUT:
-				/*
-				 * If we are in fast mode, then we simply splat
-				 * the data out in word-sized chunks as fast as
-				 * we can.
-				 */
-
-				if (!len) {
-#if 0
-					printk("scsi%d: underflow to target %d lun %d \n", hostno, target, lun);
-					st0x_aborted = DID_ERROR;
-					fast = 0;
-#endif
-					break;
-				}
-
-				if (fast && transfersize
-				    && !(len % transfersize)
-				    && (len >= transfersize)
-#ifdef FAST32
-				    && !(transfersize % 4)
-#endif
-				    ) {
-					DPRINTK (DEBUG_FAST,
-						 "scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
-						 "         len = %d, data = %08x\n",
-						 hostno, SCint->underflow,
-						 SCint->transfersize, len,
-						 data);
-
-			/* SJT: Start. Fast Write */
-#ifdef SEAGATE_USE_ASM
-					__asm__ ("cld\n\t"
-#ifdef FAST32
-						 "shr $2, %%ecx\n\t"
-						 "1:\t"
-						 "lodsl\n\t"
-						 "movl %%eax, (%%edi)\n\t"
-#else
-						 "1:\t"
-						 "lodsb\n\t"
-						 "movb %%al, (%%edi)\n\t"
-#endif
-						 "loop 1b;"
-				      /* output */ :
-				      /* input */ :"D" (st0x_dr),
-						 "S"
-						 (data),
-						 "c" (SCint->transfersize)
-/* clobbered */
-				      :	 "eax", "ecx",
-						 "esi");
-#else				/* SEAGATE_USE_ASM */
-					memcpy_toio(st0x_dr, data, transfersize);
-#endif				/* SEAGATE_USE_ASM */
-/* SJT: End */
-					len -= transfersize;
-					data += transfersize;
-					DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data);
-				} else {
-					/*
-					 *    We loop as long as we are in a 
-					 *    data out phase, there is data to
-					 *    send, and BSY is still active.
-					 */
-
-/* SJT: Start. Slow Write. */
-#ifdef SEAGATE_USE_ASM
-
-					int __dummy_1, __dummy_2;
-
-/*
- *      We loop as long as we are in a data out phase, there is data to send, 
- *      and BSY is still active.
- */
-/* Local variables : len = ecx , data = esi, 
-                     st0x_cr_sr = ebx, st0x_dr =  edi
-*/
-					__asm__ (
-							/* Test for any data here at all. */
-							"orl %%ecx, %%ecx\n\t"
-							"jz 2f\n\t" "cld\n\t"
-/*                    "movl st0x_cr_sr, %%ebx\n\t"  */
-/*                    "movl st0x_dr, %%edi\n\t"  */
-							"1:\t"
-							"movb (%%ebx), %%al\n\t"
-							/* Test for BSY */
-							"test $1, %%al\n\t"
-							"jz 2f\n\t"
-							/* Test for data out phase - STATUS & REQ_MASK should be 
-							   REQ_DATAOUT, which is 0. */
-							"test $0xe, %%al\n\t"
-							"jnz 2f\n\t"
-							/* Test for REQ */
-							"test $0x10, %%al\n\t"
-							"jz 1b\n\t"
-							"lodsb\n\t"
-							"movb %%al, (%%edi)\n\t"
-							"loop 1b\n\t" "2:\n"
-				      /* output */ :"=S" (data), "=c" (len),
-							"=b"
-							(__dummy_1),
-							"=D" (__dummy_2)
-/* input */
-				      :		"0" (data), "1" (len),
-							"2" (st0x_cr_sr),
-							"3" (st0x_dr)
-/* clobbered */
-				      :		"eax");
-#else				/* SEAGATE_USE_ASM */
-					while (len) {
-						unsigned char stat;
-
-						stat = STATUS;
-						if (!(stat & STAT_BSY)
-						    || ((stat & REQ_MASK) !=
-							REQ_DATAOUT))
-							break;
-						if (stat & STAT_REQ) {
-							WRITE_DATA (*data++);
-							--len;
-						}
-					}
-#endif				/* SEAGATE_USE_ASM */
-/* SJT: End. */
-				}
-
-				if (!len && nobuffs) {
-					--nobuffs;
-					++buffer;
-					len = buffer->length;
-					data = page_address(buffer->page) + buffer->offset;
-					DPRINTK (DEBUG_SG,
-						 "scsi%d : next scatter-gather buffer len = %d address = %08x\n",
-						 hostno, len, data);
-				}
-				break;
-
-			case REQ_DATAIN:
-#ifdef SLOW_RATE
-				if (borken) {
-#if (DEBUG & (PHASE_DATAIN))
-					transfered += len;
-#endif
-					for (; len && (STATUS & (REQ_MASK | STAT_REQ)) == (REQ_DATAIN | STAT_REQ); --len) {
-						*data++ = DATA;
-						borken_wait();
-					}
-#if (DEBUG & (PHASE_DATAIN))
-					transfered -= len;
-#endif
-				} else
-#endif
-
-					if (fast && transfersize
-					    && !(len % transfersize)
-					    && (len >= transfersize)
-#ifdef FAST32
-					    && !(transfersize % 4)
-#endif
-				    ) {
-					DPRINTK (DEBUG_FAST,
-						 "scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
-						 "         len = %d, data = %08x\n",
-						 hostno, SCint->underflow,
-						 SCint->transfersize, len,
-						 data);
-
-/* SJT: Start. Fast Read */
-#ifdef SEAGATE_USE_ASM
-					__asm__ ("cld\n\t"
-#ifdef FAST32
-						 "shr $2, %%ecx\n\t"
-						 "1:\t"
-						 "movl (%%esi), %%eax\n\t"
-						 "stosl\n\t"
-#else
-						 "1:\t"
-						 "movb (%%esi), %%al\n\t"
-						 "stosb\n\t"
-#endif
-						 "loop 1b\n\t"
-				      /* output */ :
-				      /* input */ :"S" (st0x_dr),
-						 "D"
-						 (data),
-						 "c" (SCint->transfersize)
-/* clobbered */
-				      :	 "eax", "ecx",
-						 "edi");
-#else				/* SEAGATE_USE_ASM */
-					memcpy_fromio(data, st0x_dr, len);
-#endif				/* SEAGATE_USE_ASM */
-/* SJT: End */
-					len -= transfersize;
-					data += transfersize;
-#if (DEBUG & PHASE_DATAIN)
-					printk ("scsi%d: transfered += %d\n", hostno, transfersize);
-					transfered += transfersize;
-#endif
-
-					DPRINTK (DEBUG_FAST, "scsi%d : FAST transfer complete len = %d data = %08x\n", hostno, len, data);
-				} else {
-
-#if (DEBUG & PHASE_DATAIN)
-					printk ("scsi%d: transfered += %d\n", hostno, len);
-					transfered += len;	/* Assume we'll transfer it all, then
-								   subtract what we *didn't* transfer */
-#endif
-
-/*
- *	We loop as long as we are in a data in phase, there is room to read,
- *      and BSY is still active
- */
-
-/* SJT: Start. */
-#ifdef SEAGATE_USE_ASM
-
-					int __dummy_3, __dummy_4;
-
-/* Dummy clobbering variables for the new gcc-2.95 */
-
-/*
- *      We loop as long as we are in a data in phase, there is room to read, 
- *      and BSY is still active
- */
-					/* Local variables : ecx = len, edi = data
-					   esi = st0x_cr_sr, ebx = st0x_dr */
-					__asm__ (
-							/* Test for room to read */
-							"orl %%ecx, %%ecx\n\t"
-							"jz 2f\n\t" "cld\n\t"
-/*                "movl st0x_cr_sr, %%esi\n\t"  */
-/*                "movl st0x_dr, %%ebx\n\t"  */
-							"1:\t"
-							"movb (%%esi), %%al\n\t"
-							/* Test for BSY */
-							"test $1, %%al\n\t"
-							"jz 2f\n\t"
-							/* Test for data in phase - STATUS & REQ_MASK should be REQ_DATAIN, 
-							   = STAT_IO, which is 4. */
-							"movb $0xe, %%ah\n\t"
-							"andb %%al, %%ah\n\t"
-							"cmpb $0x04, %%ah\n\t"
-							"jne 2f\n\t"
-							/* Test for REQ */
-							"test $0x10, %%al\n\t"
-							"jz 1b\n\t"
-							"movb (%%ebx), %%al\n\t"
-							"stosb\n\t"
-							"loop 1b\n\t" "2:\n"
-				      /* output */ :"=D" (data), "=c" (len),
-							"=S"
-							(__dummy_3),
-							"=b" (__dummy_4)
-/* input */
-				      :		"0" (data), "1" (len),
-							"2" (st0x_cr_sr),
-							"3" (st0x_dr)
-/* clobbered */
-				      :		"eax");
-#else				/* SEAGATE_USE_ASM */
-					while (len) {
-						unsigned char stat;
-
-						stat = STATUS;
-						if (!(stat & STAT_BSY)
-						    || ((stat & REQ_MASK) !=
-							REQ_DATAIN))
-							break;
-						if (stat & STAT_REQ) {
-							*data++ = DATA;
-							--len;
-						}
-					}
-#endif				/* SEAGATE_USE_ASM */
-/* SJT: End. */
-#if (DEBUG & PHASE_DATAIN)
-					printk ("scsi%d: transfered -= %d\n", hostno, len);
-					transfered -= len;	/* Since we assumed all of Len got  *
-								   transfered, correct our mistake */
-#endif
-				}
-
-				if (!len && nobuffs) {
-					--nobuffs;
-					++buffer;
-					len = buffer->length;
-					data = page_address(buffer->page) + buffer->offset;
-					DPRINTK (DEBUG_SG, "scsi%d : next scatter-gather buffer len = %d address = %08x\n", hostno, len, data);
-				}
-				break;
-
-			case REQ_CMDOUT:
-				while (((status_read = STATUS) & STAT_BSY) &&
-				       ((status_read & REQ_MASK) == REQ_CMDOUT))
-					if (status_read & STAT_REQ) {
-						WRITE_DATA (*(const unsigned char *) cmnd);
-						cmnd = 1 + (const unsigned char *)cmnd;
-#ifdef SLOW_RATE
-						if (borken)
-							borken_wait ();
-#endif
-					}
-				break;
-
-			case REQ_STATIN:
-				status = DATA;
-				break;
-
-			case REQ_MSGOUT:
-				/*
-				 *	We can only have sent a MSG OUT if we
-				 *	requested to do this by raising ATTN.
-				 *	So, we must drop ATTN.
-				 */
-				WRITE_CONTROL (BASE_CMD | CMD_DRVR_ENABLE);
-				/*
-				 *	If we are reconnecting, then we must 
-				 *	send an IDENTIFY message in response
-				 *	to MSGOUT.
-				 */
-				switch (reselect) {
-				case CAN_RECONNECT:
-					WRITE_DATA (IDENTIFY (1, lun));
-					DPRINTK (PHASE_RESELECT | PHASE_MSGOUT, "scsi%d : sent IDENTIFY message.\n", hostno);
-					break;
-#ifdef LINKED
-				case LINKED_WRONG:
-					WRITE_DATA (ABORT);
-					linked_connected = 0;
-					reselect = CAN_RECONNECT;
-					goto connect_loop;
-					DPRINTK (PHASE_MSGOUT | DEBUG_LINKED, "scsi%d : sent ABORT message to cancel incorrect I_T_L nexus.\n", hostno);
-#endif					/* LINKED */
-					DPRINTK (DEBUG_LINKED, "correct\n");
-				default:
-					WRITE_DATA (NOP);
-					printk("scsi%d : target %d requested MSGOUT, sent NOP message.\n", hostno, target);
-				}
-				break;
-
-			case REQ_MSGIN:
-				switch (message = DATA) {
-				case DISCONNECT:
-					DANY("seagate: deciding to disconnect\n");
-					should_reconnect = 1;
-					current_data = data;	/* WDE add */
-					current_buffer = buffer;
-					current_bufflen = len;	/* WDE add */
-					current_nobuffs = nobuffs;
-#ifdef LINKED
-					linked_connected = 0;
-#endif
-					done = 1;
-					DPRINTK ((PHASE_RESELECT | PHASE_MSGIN), "scsi%d : disconnected.\n", hostno);
-					break;
-
-#ifdef LINKED
-				case LINKED_CMD_COMPLETE:
-				case LINKED_FLG_CMD_COMPLETE:
-#endif
-				case COMMAND_COMPLETE:
-					/*
-					 * Note : we should check for underflow here.
-					 */
-					DPRINTK(PHASE_MSGIN, "scsi%d : command complete.\n", hostno);
-					done = 1;
-					break;
-				case ABORT:
-					DPRINTK(PHASE_MSGIN, "scsi%d : abort message.\n", hostno);
-					done = 1;
-					break;
-				case SAVE_POINTERS:
-					current_buffer = buffer;
-					current_bufflen = len;	/* WDE add */
-					current_data = data;	/* WDE mod */
-					current_nobuffs = nobuffs;
-					DPRINTK (PHASE_MSGIN, "scsi%d : pointers saved.\n", hostno);
-					break;
-				case RESTORE_POINTERS:
-					buffer = current_buffer;
-					cmnd = current_cmnd;
-					data = current_data;	/* WDE mod */
-					len = current_bufflen;
-					nobuffs = current_nobuffs;
-					DPRINTK(PHASE_MSGIN, "scsi%d : pointers restored.\n", hostno);
-					break;
-				default:
-
-					/*
-					 *	IDENTIFY distinguishes itself
-					 *	from the other messages by 
-					 *	setting the high bit.
-					 *
-					 *      Note : we need to handle at 
-					 *	least one outstanding command
-					 *	per LUN, and need to hash the 
-					 *	SCSI command for that I_T_L
-					 *	nexus based on the known ID 
-					 *	(at this point) and LUN.
-					 */
-
-					if (message & 0x80) {
-						DPRINTK (PHASE_MSGIN, "scsi%d : IDENTIFY message received from id %d, lun %d.\n", hostno, target, message & 7);
-					} else {
-						/*
-						 *      We should go into a
-						 *	MESSAGE OUT phase, and
-						 *	send  a MESSAGE_REJECT
-						 *      if we run into a message 
-						 *	that we don't like.  The
-						 *	seagate driver needs 
-						 *	some serious 
-						 *	restructuring first
-						 *	though.
-						 */
-						DPRINTK (PHASE_MSGIN, "scsi%d : unknown message %d from target %d.\n", hostno, message, target);
-					}
-				}
-				break;
-			default:
-				printk(KERN_ERR "scsi%d : unknown phase.\n", hostno);
-				st0x_aborted = DID_ERROR;
-			}	/* end of switch (status_read &  REQ_MASK) */
-#ifdef SLOW_RATE
-			/*
-			 * I really don't care to deal with borken devices in
-			 * each single byte transfer case (ie, message in,
-			 * message out, status), so I'll do the wait here if 
-			 * necessary.
-			 */
-			if(borken)
-				borken_wait();
-#endif
-
-		}		/* if(status_read & STAT_REQ) ends */
-	}			/* while(((status_read = STATUS)...) ends */
-
-	DPRINTK(PHASE_DATAIN | PHASE_DATAOUT | PHASE_EXIT, "scsi%d : Transfered %d bytes\n", hostno, transfered);
-
-#if (DEBUG & PHASE_EXIT)
-#if 0				/* Doesn't work for scatter/gather */
-	printk("Buffer : \n");
-	for(i = 0; i < 20; ++i)
-		printk("%02x  ", ((unsigned char *) data)[i]);	/* WDE mod */
-	printk("\n");
-#endif
-	printk("scsi%d : status = ", hostno);
-	scsi_print_status(status);
-	printk(" message = %02x\n", message);
-#endif
-
-	/* We shouldn't reach this until *after* BSY has been deasserted */
-
-#ifdef LINKED
-	else
-	{
-		/*
-		 * Fix the message byte so that unsuspecting high level drivers
-		 * don't puke when they see a LINKED COMMAND message in place of
-		 * the COMMAND COMPLETE they may be expecting.  Shouldn't be
-		 * necessary, but it's better to be on the safe side.
-		 *
-		 * A non LINKED* message byte will indicate that the command
-		 * completed, and we are now disconnected.
-		 */
-
-		switch (message) {
-		case LINKED_CMD_COMPLETE:
-		case LINKED_FLG_CMD_COMPLETE:
-			message = COMMAND_COMPLETE;
-			linked_target = current_target;
-			linked_lun = current_lun;
-			linked_connected = 1;
-			DPRINTK (DEBUG_LINKED, "scsi%d : keeping I_T_L nexus established for linked command.\n", hostno);
-			/* We also will need to adjust status to accommodate intermediate
-			   conditions. */
-			if ((status == INTERMEDIATE_GOOD) || (status == INTERMEDIATE_C_GOOD))
-				status = GOOD;
-			break;
-			/*
-			 * We should also handle what are "normal" termination
-			 * messages here (ABORT, BUS_DEVICE_RESET?, and
-			 * COMMAND_COMPLETE individually, and flake if things
-			 * aren't right.
-			 */
-		default:
-			DPRINTK (DEBUG_LINKED, "scsi%d : closing I_T_L nexus.\n", hostno);
-			linked_connected = 0;
-		}
-	}
-#endif	/* LINKED */
-
-	if (should_reconnect) {
-		DPRINTK (PHASE_RESELECT, "scsi%d : exiting seagate_st0x_queue_command() with reconnect enabled.\n", hostno);
-		WRITE_CONTROL (BASE_CMD | CMD_INTR);
-	} else
-		WRITE_CONTROL (BASE_CMD);
-
-	return retcode (st0x_aborted);
-}				/* end of internal_command */
-
-static int seagate_st0x_abort(struct scsi_cmnd * SCpnt)
-{
-	st0x_aborted = DID_ABORT;
-	return SUCCESS;
-}
-
-#undef ULOOP
-#undef TIMEOUT
-
-/*
- * the seagate_st0x_reset function resets the SCSI bus 
- *
- * May be called with SCpnt = NULL
- */
-
-static int seagate_st0x_bus_reset(struct scsi_cmnd * SCpnt)
-{
-	/* No timeouts - this command is going to fail because it was reset. */
-	DANY ("scsi%d: Reseting bus... ", hostno);
-
-	/* assert  RESET signal on SCSI bus.  */
-	WRITE_CONTROL (BASE_CMD | CMD_RST);
-
-	mdelay (20);
-
-	WRITE_CONTROL (BASE_CMD);
-	st0x_aborted = DID_RESET;
-
-	DANY ("done.\n");
-	return SUCCESS;
-}
-
-static int seagate_st0x_release(struct Scsi_Host *shost)
-{
-	if (shost->irq)
-		free_irq(shost->irq, shost);
-	release_region(shost->io_port, shost->n_io_port);
-	return 0;
-}
-
-static struct scsi_host_template driver_template = {
-	.detect         	= seagate_st0x_detect,
-	.release        	= seagate_st0x_release,
-	.info           	= seagate_st0x_info,
-	.queuecommand   	= seagate_st0x_queue_command,
-	.eh_abort_handler	= seagate_st0x_abort,
-	.eh_bus_reset_handler	= seagate_st0x_bus_reset,
-	.can_queue      	= 1,
-	.this_id        	= 7,
-	.sg_tablesize   	= SG_ALL,
-	.cmd_per_lun    	= 1,
-	.use_clustering		= DISABLE_CLUSTERING,
-};
-#include "scsi_module.c"
-- 
1.5.3.1

[PATCH 27/32] scsi_data_buffer

[Boaz Harrosh]

  In preparation for bidi we abstract all IO members of scsi_cmnd,
  that will need to duplicate, into a substructure.

  - Group all IO members of scsi_cmnd into a scsi_data_buffer
    structure.
  - Adjust accessors to new members.
  - scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
    scsi_cmnd. And work on it.
  - Adjust scsi_init_io() and  scsi_release_buffers() for above
    change.
  - Fix other parts of scsi_lib/scsi.c to members migration. Use
    accessors where appropriate.

  - Old I/O members are kept for backward compatibility, since
    not all of scsi-ml/ul is converted yet. Once done they will
    be removed in a closing patch. (Other wise the patchset will
    not be bisectable)

  - fix Documentation about scsi_cmnd in scsi_host.h
  - Small API shim in scsi_tgt_lib (to be removed in
    tgt patch)

 Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
 Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 drivers/scsi/scsi.c         |    2 +-
 drivers/scsi/scsi_lib.c     |   80 ++++++++++++++++---------------------------
 drivers/scsi/scsi_tgt_lib.c |   18 ++++++++++
 include/scsi/scsi_cmnd.h    |   57 ++++++++++++++++++++++--------
 include/scsi/scsi_host.h    |    4 +-
 5 files changed, 92 insertions(+), 69 deletions(-)

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 1929488..73d2216 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -698,7 +698,7 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
 				"Notifying upper driver of completion "
 				"(result %x)\n", cmd->result));
 
-	good_bytes = cmd->request_bufflen;
+	good_bytes = scsi_bufflen(cmd);
         if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) {
 		drv = scsi_cmd_to_driver(cmd);
 		if (drv->done)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index aac8a02..ce59cfe 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -438,7 +438,7 @@ EXPORT_SYMBOL_GPL(scsi_execute_async);
 static void scsi_init_cmd_errh(struct scsi_cmnd *cmd)
 {
 	cmd->serial_number = 0;
-	cmd->resid = 0;
+	scsi_set_resid(cmd, 0);
 	memset(cmd->sense_buffer, 0, sizeof cmd->sense_buffer);
 	if (cmd->cmd_len == 0)
 		cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
@@ -737,16 +737,15 @@ static inline unsigned int scsi_sgtable_index(unsigned short nents)
 	return index;
 }
 
-struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
+int scsi_alloc_sgtable(struct scsi_data_buffer * sdb, unsigned short sg_count,
+                       gfp_t gfp_mask)
 {
 	struct scsi_host_sg_pool *sgp;
 	struct scatterlist *sgl, *prev, *ret;
 	unsigned int index;
 	int this, left;
 
-	BUG_ON(!cmd->use_sg);
-
-	left = cmd->use_sg;
+	left = sg_count;
 	ret = prev = NULL;
 	do {
 		this = left;
@@ -793,8 +792,9 @@ struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 	 * ->use_sg may get modified after dma mapping has potentially
 	 * shrunk the number of segments, so keep a copy of it for free.
 	 */
-	cmd->__use_sg = cmd->use_sg;
-	return ret;
+	sdb->alloc_sg_count = sdb->sg_count = sg_count;
+	sdb->sglist = ret;
+	return 0;
 enomem:
 	if (ret) {
 		/*
@@ -813,26 +813,25 @@ enomem:
 
 		mempool_free(prev, sgp->pool);
 	}
-	return NULL;
+	return -1;
 }
-
 EXPORT_SYMBOL(scsi_alloc_sgtable);
 
-void scsi_free_sgtable(struct scsi_cmnd *cmd)
+void scsi_free_sgtable(struct scsi_data_buffer *sdb)
 {
-	struct scatterlist *sgl = cmd->request_buffer;
+	struct scatterlist *sgl = sdb->sglist;
 	struct scsi_host_sg_pool *sgp;
 
 	/*
 	 * if this is the biggest size sglist, check if we have
 	 * chained parts we need to free
 	 */
-	if (cmd->__use_sg > SCSI_MAX_SG_SEGMENTS) {
+	if (sdb->alloc_sg_count > SCSI_MAX_SG_SEGMENTS) {
 		unsigned short this, left;
 		struct scatterlist *next;
 		unsigned int index;
 
-		left = cmd->__use_sg - (SCSI_MAX_SG_SEGMENTS - 1);
+		left = sdb->alloc_sg_count - (SCSI_MAX_SG_SEGMENTS - 1);
 		next = sg_chain_ptr(&sgl[SCSI_MAX_SG_SEGMENTS - 1]);
 		while (left && next) {
 			sgl = next;
@@ -856,14 +855,13 @@ void scsi_free_sgtable(struct scsi_cmnd *cmd)
 		/*
 		 * Restore original, will be freed below
 		 */
-		sgl = cmd->request_buffer;
+		sgl = sdb->sglist;
 		sgp = scsi_sg_pools + SG_MEMPOOL_NR - 1;
 	} else
-		sgp = scsi_sg_pools + scsi_sgtable_index(cmd->__use_sg);
+		sgp = scsi_sg_pools + scsi_sgtable_index(sdb->sg_count);
 
 	mempool_free(sgl, sgp->pool);
 }
-
 EXPORT_SYMBOL(scsi_free_sgtable);
 
 /*
@@ -885,15 +883,10 @@ EXPORT_SYMBOL(scsi_free_sgtable);
  */
 static void scsi_release_buffers(struct scsi_cmnd *cmd)
 {
-	if (cmd->use_sg)
-		scsi_free_sgtable(cmd);
+	if (cmd->sdb.sglist)
+		scsi_free_sgtable(&cmd->sdb);
 
-	/*
-	 * Zero these out.  They now point to freed memory, and it is
-	 * dangerous to hang onto the pointers.
-	 */
-	cmd->request_buffer = NULL;
-	cmd->request_bufflen = 0;
+	memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 }
 
 /*
@@ -927,7 +920,7 @@ static void scsi_release_buffers(struct scsi_cmnd *cmd)
 void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 {
 	int result = cmd->result;
-	int this_count = cmd->request_bufflen;
+	int this_count = scsi_bufflen(cmd);
 	struct request_queue *q = cmd->device->request_queue;
 	struct request *req = cmd->request;
 	int clear_errors = 1;
@@ -935,8 +928,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 	int sense_valid = 0;
 	int sense_deferred = 0;
 
-	scsi_release_buffers(cmd);
-
 	if (result) {
 		sense_valid = scsi_command_normalize_sense(cmd, &sshdr);
 		if (sense_valid)
@@ -959,9 +950,11 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 				req->sense_len = len;
 			}
 		}
-		req->data_len = cmd->resid;
+		req->data_len = scsi_get_resid(cmd);
 	}
 
+	scsi_release_buffers(cmd);
+
 	/*
 	 * Next deal with any sectors which we were able to correctly
 	 * handle.
@@ -969,7 +962,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
 	SCSI_LOG_HLCOMPLETE(1, printk("%ld sectors total, "
 				      "%d bytes done.\n",
 				      req->nr_sectors, good_bytes));
-	SCSI_LOG_HLCOMPLETE(1, printk("use_sg is %d\n", cmd->use_sg));
 
 	if (clear_errors)
 		req->errors = 0;
@@ -1101,41 +1093,31 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
 {
 	struct request     *req = cmd->request;
 	int		   count;
+	struct scsi_data_buffer *sdb = &cmd->sdb;
 
-	/*
-	 * We used to not use scatter-gather for single segment request,
-	 * but now we do (it makes highmem I/O easier to support without
-	 * kmapping pages)
-	 */
-	cmd->use_sg = req->nr_phys_segments;
-
-	/*
-	 * If sg table allocation fails, requeue request later.
-	 */
-	cmd->request_buffer = scsi_alloc_sgtable(cmd, GFP_ATOMIC);
-	if (unlikely(!cmd->request_buffer)) {
+	if (scsi_alloc_sgtable(sdb, req->nr_phys_segments, GFP_ATOMIC)) {
 		scsi_unprep_request(req);
 		return BLKPREP_DEFER;
 	}
 
 	req->buffer = NULL;
 	if (blk_pc_request(req))
-		cmd->request_bufflen = req->data_len;
+		sdb->length = req->data_len;
 	else
-		cmd->request_bufflen = req->nr_sectors << 9;
+		sdb->length = req->nr_sectors << 9;
 
 	/* 
 	 * Next, walk the list, and fill in the addresses and sizes of
 	 * each segment.
 	 */
-	count = blk_rq_map_sg(req->q, req, cmd->request_buffer);
-	if (likely(count <= cmd->use_sg)) {
-		cmd->use_sg = count;
+	count = blk_rq_map_sg(req->q, req, sdb->sglist);
+	if (likely(count <= sdb->sg_count)) {
+		sdb->sg_count = count;
 		return BLKPREP_OK;
 	}
 
 	printk(KERN_ERR "Incorrect number of segments after building list\n");
-	printk(KERN_ERR "counted %d, received %d\n", count, cmd->use_sg);
+	printk(KERN_ERR "counted %d, received %d\n", count, sdb->sg_count);
 	printk(KERN_ERR "req nr_sec %lu, cur_nr_sec %u\n", req->nr_sectors,
 			req->current_nr_sectors);
 
@@ -1193,9 +1175,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
 		BUG_ON(req->data_len);
 		BUG_ON(req->data);
 
-		cmd->request_bufflen = 0;
-		cmd->request_buffer = NULL;
-		cmd->use_sg = 0;
+		memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 		req->buffer = NULL;
 	}
 
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index a91761c..b4b3af5 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -60,6 +60,24 @@ struct scsi_tgt_queuedata {
 	spinlock_t cmd_hash_lock;
 };
 
+/* FIXME Begin: Shim API until tgt is converted to use sdb */
+static struct scatterlist *tgt_scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t flags)
+{
+	if (scsi_alloc_sgtable(&cmd->sdb, cmd->use_sg, flags))
+		return NULL;
+	return cmd->sdb.sglist;
+}
+
+static void tgt_scsi_free_sgtable(struct scsi_cmnd *cmd)
+{
+	scsi_free_sgtable(&cmd->sdb);
+}
+#define scsi_alloc_sgtable tgt_scsi_alloc_sgtable
+#define scsi_free_sgtable tgt_scsi_free_sgtable
+
+/* FIXME End: Shim API until tgt is converted to use sdb */
+
+
 /*
  * Function:	scsi_host_get_command()
  *
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 3f47e52..047ffe6 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -12,6 +12,13 @@ struct scatterlist;
 struct Scsi_Host;
 struct scsi_device;
 
+struct scsi_data_buffer {
+	unsigned length;
+	int resid;
+	unsigned short sg_count;
+	unsigned short alloc_sg_count;
+	struct scatterlist* sglist;
+};
 
 /* embedded in scsi_cmnd */
 struct scsi_pointer {
@@ -62,15 +69,10 @@ struct scsi_cmnd {
 	/* These elements define the operation we are about to perform */
 #define MAX_COMMAND_SIZE	16
 	unsigned char cmnd[MAX_COMMAND_SIZE];
-	unsigned request_bufflen;	/* Actual request size */
 
 	struct timer_list eh_timeout;	/* Used to time out the command. */
-	void *request_buffer;		/* Actual requested buffer */
 
 	/* These elements define the operation we ultimately want to perform */
-	unsigned short use_sg;	/* Number of pieces of scatter-gather */
-	unsigned short __use_sg;
-
 	unsigned underflow;	/* Return error if less than
 				   this amount is transferred */
 
@@ -80,10 +82,6 @@ struct scsi_cmnd {
 				   reconnects.   Probably == sector
 				   size */
 
-	int resid;		/* Number of bytes requested to be
-				   transferred less actual number
-				   transferred (0 if not supported) */
-
 	struct request *request;	/* The command we are
 				   	   working on */
 
@@ -114,6 +112,22 @@ struct scsi_cmnd {
 	int result;		/* Status code from lower level driver */
 
 	unsigned char tag;	/* SCSI-II queued command tag */
+
+	union {
+		struct scsi_data_buffer sdb;
+		/*
+		 * FIXME: Here for compatibility with unconverted drivers.
+		 *        Must be kept in sync with exact type and order
+		 *        of struct scsi_data_buffer members.
+		 */
+		struct {
+			unsigned __deprecated request_bufflen;
+			int __deprecated resid;
+			unsigned short __deprecated use_sg;
+			unsigned short __deprecated place_holder_sg_alloc;
+			void __deprecated *request_buffer;
+		};
+	};
 };
 
 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
@@ -128,24 +142,35 @@ extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
 				 size_t *offset, size_t *len);
 extern void scsi_kunmap_atomic_sg(void *virt);
 
-extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t);
-extern void scsi_free_sgtable(struct scsi_cmnd *);
+extern int scsi_alloc_sgtable(struct scsi_data_buffer *, unsigned short, gfp_t);
+extern void scsi_free_sgtable(struct scsi_data_buffer *);
 
 extern int scsi_dma_map(struct scsi_cmnd *cmd);
 extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
 
-#define scsi_sg_count(cmd) ((cmd)->use_sg)
-#define scsi_sglist(cmd) ((struct scatterlist *)(cmd)->request_buffer)
-#define scsi_bufflen(cmd) ((cmd)->request_bufflen)
+static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
+{
+	return cmd->sdb.sg_count;
+}
+
+static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
+{
+	return cmd->sdb.sglist;
+}
+
+static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
+{
+	return cmd->sdb.length;
+}
 
 static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
 {
-	cmd->resid = resid;
+	cmd->sdb.resid = resid;
 }
 
 static inline int scsi_get_resid(struct scsi_cmnd *cmd)
 {
-	return cmd->resid;
+	return cmd->sdb.resid;
 }
 
 #define scsi_for_each_sg(cmd, sg, nseg, __i)			\
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 0fd4746..cb2bcab 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -136,9 +136,9 @@ struct scsi_host_template {
 	 * the done callback is invoked.
 	 *
 	 * This is called to inform the LLD to transfer
-	 * cmd->request_bufflen bytes. The cmd->use_sg speciefies the
+	 * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the
 	 * number of scatterlist entried in the command and
-	 * cmd->request_buffer contains the scatterlist.
+	 * scsi_sglist(cmd) returns the scatterlist.
 	 *
 	 * return values: see queuecommand
 	 *
-- 
1.5.3.1

[PATCH 28/32] scsi_data_buffer - scsi_error.c

[Boaz Harrosh]

 - Changed needed members of struct scsi_eh_save.
 - Careful considerations in scsi_eh_prep/restore_cmnd.

 Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/scsi_error.c |   28 ++++++++++------------------
 include/scsi/scsi_eh.h    |    6 +-----
 2 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index d29f846..c07b2a0 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -618,29 +618,25 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
 	ses->cmd_len = scmd->cmd_len;
 	memcpy(ses->cmnd, scmd->cmnd, sizeof(scmd->cmnd));
 	ses->data_direction = scmd->sc_data_direction;
-	ses->bufflen = scmd->request_bufflen;
-	ses->buffer = scmd->request_buffer;
-	ses->use_sg = scmd->use_sg;
-	ses->resid = scmd->resid;
+	ses->sdb = scmd->sdb;
 	ses->result = scmd->result;
 
+	memset(&scmd->sdb, 0, sizeof(scmd->sdb));
+
 	if (sense_bytes) {
-		scmd->request_bufflen = min_t(unsigned,
+		scmd->sdb.length = min_t(unsigned,
 		                       sizeof(scmd->sense_buffer), sense_bytes);
 		sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
-		                                       scmd->request_bufflen);
-		scmd->request_buffer = &ses->sense_sgl;
+		                                       scmd->sdb.length);
+		scmd->sdb.sglist = &ses->sense_sgl;
 		scmd->sc_data_direction = DMA_FROM_DEVICE;
-		scmd->use_sg = 1;
+		scmd->sdb.sg_count = 1;
 		memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
 		scmd->cmnd[0] = REQUEST_SENSE;
-		scmd->cmnd[4] = scmd->request_bufflen;
+		scmd->cmnd[4] = scmd->sdb.length;
 		scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
 	} else {
-		scmd->request_buffer = NULL;
-		scmd->request_bufflen = 0;
 		scmd->sc_data_direction = DMA_NONE;
-		scmd->use_sg = 0;
 		if (cmnd) {
 			memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
 			memcpy(scmd->cmnd, cmnd, cmnd_size);
@@ -677,10 +673,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
 	scmd->cmd_len = ses->cmd_len;
 	memcpy(scmd->cmnd, ses->cmnd, sizeof(scmd->cmnd));
 	scmd->sc_data_direction = ses->data_direction;
-	scmd->request_bufflen = ses->bufflen;
-	scmd->request_buffer = ses->buffer;
-	scmd->use_sg = ses->use_sg;
-	scmd->resid = ses->resid;
+	scmd->sdb = ses->sdb;
 	scmd->result = ses->result;
 }
 EXPORT_SYMBOL(scsi_eh_restore_cmnd);
@@ -1700,8 +1693,7 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
 	memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
     
 	scmd->scsi_done		= scsi_reset_provider_done_command;
-	scmd->request_buffer		= NULL;
-	scmd->request_bufflen		= 0;
+	memset(&scmd->sdb, 0, sizeof(scmd->sdb));
 
 	scmd->cmd_len			= 0;
 
diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 44224ba..17b4b19 100644
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -71,11 +71,7 @@ struct scsi_eh_save {
 	unsigned char cmd_len;
 	unsigned char cmnd[MAX_COMMAND_SIZE];
 
-	void *buffer;
-	unsigned bufflen;
-	unsigned short use_sg;
-	int resid;
-
+	struct scsi_data_buffer sdb;
 	struct scatterlist sense_sgl;
 };
 
-- 
1.5.3.1

[PATCH 29/32] scsi_data_buffer - sd.c and sr.c

[Boaz Harrosh]

  - sd and sr would adjust IO size to align on device's block
    size so code needs to change once we move to scsi_data_buff
    implementation.
  - Convert code to use scsi_for_each_sg
  - Use data accessors where appropriate.
  - Remove dead code (req_data_dir() != READ && != WRITE)

 Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/sd.c |    7 ++-----
 drivers/scsi/sr.c |   28 +++++++++++++---------------
 2 files changed, 15 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 69f542c..c241f7e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -448,9 +448,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
 	} else if (rq_data_dir(rq) == READ) {
 		SCpnt->cmnd[0] = READ_6;
 		SCpnt->sc_data_direction = DMA_FROM_DEVICE;
-	} else {
-		scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
-		goto out;
 	}
 
 	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
@@ -510,7 +507,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
 		SCpnt->cmnd[4] = (unsigned char) this_count;
 		SCpnt->cmnd[5] = 0;
 	}
-	SCpnt->request_bufflen = this_count * sdp->sector_size;
+	SCpnt->sdb.length = this_count * sdp->sector_size;
 
 	/*
 	 * We shouldn't disconnect in the middle of a sector, so with a dumb
@@ -904,7 +901,7 @@ static struct block_device_operations sd_fops = {
 static int sd_done(struct scsi_cmnd *SCpnt)
 {
 	int result = SCpnt->result;
- 	unsigned int xfer_size = SCpnt->request_bufflen;
+	unsigned int xfer_size = scsi_bufflen(SCpnt);
  	unsigned int good_bytes = result ? 0 : xfer_size;
  	u64 start_lba = SCpnt->request->sector;
  	u64 bad_lba;
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index c619990..0375ad2 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -218,7 +218,7 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot)
 static int sr_done(struct scsi_cmnd *SCpnt)
 {
 	int result = SCpnt->result;
-	int this_count = SCpnt->request_bufflen;
+	int this_count = scsi_bufflen(SCpnt);
 	int good_bytes = (result == 0 ? this_count : 0);
 	int block_sectors = 0;
 	long error_sector;
@@ -360,23 +360,21 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
 	} else if (rq_data_dir(rq) == READ) {
 		SCpnt->cmnd[0] = READ_10;
 		SCpnt->sc_data_direction = DMA_FROM_DEVICE;
-	} else {
-		blk_dump_rq_flags(rq, "Unknown sr command");
-		goto out;
 	}
 
 	{
-		struct scatterlist *sg = SCpnt->request_buffer;
-		int i, size = 0;
-		for (i = 0; i < SCpnt->use_sg; i++)
-			size += sg[i].length;
+		struct scatterlist *sg;
+		int i, size = 0, sg_count = scsi_sg_count(SCpnt);
+
+		scsi_for_each_sg (SCpnt, sg, sg_count, i)
+			size += sg->length;
 
-		if (size != SCpnt->request_bufflen && SCpnt->use_sg) {
+		if (size != scsi_bufflen(SCpnt)) {
 			scmd_printk(KERN_ERR, SCpnt,
 				"mismatch count %d, bytes %d\n",
-				size, SCpnt->request_bufflen);
-			if (SCpnt->request_bufflen > size)
-				SCpnt->request_bufflen = size;
+				size, scsi_bufflen(SCpnt));
+			if (scsi_bufflen(SCpnt) > size)
+				SCpnt->sdb.length = size;
 		}
 	}
 
@@ -384,12 +382,12 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
 	 * request doesn't start on hw block boundary, add scatter pads
 	 */
 	if (((unsigned int)rq->sector % (s_size >> 9)) ||
-	    (SCpnt->request_bufflen % s_size)) {
+	    (scsi_bufflen(SCpnt) % s_size)) {
 		scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n");
 		goto out;
 	}
 
-	this_count = (SCpnt->request_bufflen >> 9) / (s_size >> 9);
+	this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9);
 
 
 	SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%ld 512 byte blocks.\n",
@@ -403,7 +401,7 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
 
 	if (this_count > 0xffff) {
 		this_count = 0xffff;
-		SCpnt->request_bufflen = this_count * s_size;
+		SCpnt->sdb.length = this_count * s_size;
 	}
 
 	SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
-- 
1.5.3.1

[PATCH 30/32] tgt: convert to use scsi_data_buffer

[Boaz Harrosh]

From: FUJITA Tomonori <tomof@acm.org>

Signed-off-by: FUJITA Tomonori <tomof@acm.org>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/scsi_tgt_if.c  |    2 +-
 drivers/scsi/scsi_tgt_lib.c |   43 ++++++++++++-------------------------------
 2 files changed, 13 insertions(+), 32 deletions(-)

diff --git a/drivers/scsi/scsi_tgt_if.c b/drivers/scsi/scsi_tgt_if.c
index 9815a1a..d2557db 100644
--- a/drivers/scsi/scsi_tgt_if.c
+++ b/drivers/scsi/scsi_tgt_if.c
@@ -112,7 +112,7 @@ int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 itn_id,
 	memset(&ev, 0, sizeof(ev));
 	ev.p.cmd_req.host_no = shost->host_no;
 	ev.p.cmd_req.itn_id = itn_id;
-	ev.p.cmd_req.data_len = cmd->request_bufflen;
+	ev.p.cmd_req.data_len = scsi_bufflen(cmd);
 	memcpy(ev.p.cmd_req.scb, cmd->cmnd, sizeof(ev.p.cmd_req.scb));
 	memcpy(ev.p.cmd_req.lun, lun, sizeof(ev.p.cmd_req.lun));
 	ev.p.cmd_req.attribute = cmd->tag;
diff --git a/drivers/scsi/scsi_tgt_lib.c b/drivers/scsi/scsi_tgt_lib.c
index b4b3af5..c2e776d 100644
--- a/drivers/scsi/scsi_tgt_lib.c
+++ b/drivers/scsi/scsi_tgt_lib.c
@@ -60,24 +60,6 @@ struct scsi_tgt_queuedata {
 	spinlock_t cmd_hash_lock;
 };
 
-/* FIXME Begin: Shim API until tgt is converted to use sdb */
-static struct scatterlist *tgt_scsi_alloc_sgtable(struct scsi_cmnd *cmd, gfp_t flags)
-{
-	if (scsi_alloc_sgtable(&cmd->sdb, cmd->use_sg, flags))
-		return NULL;
-	return cmd->sdb.sglist;
-}
-
-static void tgt_scsi_free_sgtable(struct scsi_cmnd *cmd)
-{
-	scsi_free_sgtable(&cmd->sdb);
-}
-#define scsi_alloc_sgtable tgt_scsi_alloc_sgtable
-#define scsi_free_sgtable tgt_scsi_free_sgtable
-
-/* FIXME End: Shim API until tgt is converted to use sdb */
-
-
 /*
  * Function:	scsi_host_get_command()
  *
@@ -349,8 +331,8 @@ static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd)
 
 	scsi_tgt_uspace_send_status(cmd, tcmd->itn_id, tcmd->tag);
 
-	if (cmd->request_buffer)
-		scsi_free_sgtable(cmd);
+	if (cmd->sdb.sglist)
+		scsi_free_sgtable(&cmd->sdb);
 
 	queue_work(scsi_tgtd, &tcmd->work);
 }
@@ -374,24 +356,23 @@ static int scsi_tgt_transfer_response(struct scsi_cmnd *cmd)
 static int scsi_tgt_init_cmd(struct scsi_cmnd *cmd, gfp_t gfp_mask)
 {
 	struct request *rq = cmd->request;
+	struct scsi_data_buffer *sdb = &cmd->sdb;
 	int count;
 
-	cmd->use_sg = rq->nr_phys_segments;
-	cmd->request_buffer = scsi_alloc_sgtable(cmd, gfp_mask);
-	if (!cmd->request_buffer)
+	if (scsi_alloc_sgtable(sdb, rq->nr_phys_segments, gfp_mask))
 		return -ENOMEM;
 
-	cmd->request_bufflen = rq->data_len;
+	sdb->length = rq->data_len;
 
-	dprintk("cmd %p cnt %d %lu\n", cmd, cmd->use_sg, rq_data_dir(rq));
-	count = blk_rq_map_sg(rq->q, rq, cmd->request_buffer);
-	if (likely(count <= cmd->use_sg)) {
-		cmd->use_sg = count;
+	dprintk("cmd %p cnt %d %lu\n", cmd, scsi_sg_count(cmd), rq_data_dir(rq));
+	count = blk_rq_map_sg(rq->q, rq, sdb->sglist);
+	if (likely(count <= sdb->sg_count)) {
+		sdb->sg_count = count;
 		return 0;
 	}
 
-	eprintk("cmd %p cnt %d\n", cmd, cmd->use_sg);
-	scsi_free_sgtable(cmd);
+	eprintk("cmd %p cnt %d\n", cmd, scsi_sg_count(cmd));
+	scsi_free_sgtable(&cmd->sdb);
 	return -EINVAL;
 }
 
@@ -515,7 +496,7 @@ int scsi_tgt_kspace_exec(int host_no, u64 itn_id, int result, u64 tag,
 	cmd = rq->special;
 
 	dprintk("cmd %p scb %x result %d len %d bufflen %u %lu %x\n",
-		cmd, cmd->cmnd[0], result, len, cmd->request_bufflen,
+		cmd, cmd->cmnd[0], result, len, scsi_bufflen(cmd),
 		rq_data_dir(rq), cmd->cmnd[0]);
 
 	if (result == TASK_ABORTED) {
-- 
1.5.3.1

[PATCH 31/32] tgt: convert ibmvstgt and libsrp to use scsi_data_buffer

[Boaz Harrosh]

From: FUJITA Tomonori <tomof@acm.org>

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 drivers/scsi/ibmvscsi/ibmvstgt.c |    2 +-
 drivers/scsi/libsrp.c            |   27 ++++++++++++++-------------
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvstgt.c b/drivers/scsi/ibmvscsi/ibmvstgt.c
index 82bcab6..d63f11e 100644
--- a/drivers/scsi/ibmvscsi/ibmvstgt.c
+++ b/drivers/scsi/ibmvscsi/ibmvstgt.c
@@ -292,7 +292,7 @@ static int ibmvstgt_cmd_done(struct scsi_cmnd *sc,
 	dprintk("%p %p %x %u\n", iue, target, vio_iu(iue)->srp.cmd.cdb[0],
 		cmd->usg_sg);
 
-	if (sc->use_sg)
+	if (scsi_sg_count(sc))
 		err = srp_transfer_data(sc, &vio_iu(iue)->srp.cmd, ibmvstgt_rdma, 1, 1);
 
 	spin_lock_irqsave(&target->lock, flags);
diff --git a/drivers/scsi/libsrp.c b/drivers/scsi/libsrp.c
index 2ad0a27..8a8562a 100644
--- a/drivers/scsi/libsrp.c
+++ b/drivers/scsi/libsrp.c
@@ -192,18 +192,18 @@ static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md,
 
 	if (dma_map) {
 		iue = (struct iu_entry *) sc->SCp.ptr;
-		sg = sc->request_buffer;
+		sg = scsi_sglist(sc);
 
-		dprintk("%p %u %u %d\n", iue, sc->request_bufflen,
-			md->len, sc->use_sg);
+		dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc),
+			md->len, scsi_sg_count(sc));
 
-		nsg = dma_map_sg(iue->target->dev, sg, sc->use_sg,
+		nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
 				 DMA_BIDIRECTIONAL);
 		if (!nsg) {
-			printk("fail to map %p %d\n", iue, sc->use_sg);
+			printk("fail to map %p %d\n", iue, scsi_sg_count(sc));
 			return 0;
 		}
-		len = min(sc->request_bufflen, md->len);
+		len = min(scsi_bufflen(sc), md->len);
 	} else
 		len = md->len;
 
@@ -229,10 +229,10 @@ static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
 
 	if (dma_map || ext_desc) {
 		iue = (struct iu_entry *) sc->SCp.ptr;
-		sg = sc->request_buffer;
+		sg = scsi_sglist(sc);
 
 		dprintk("%p %u %u %d %d\n",
-			iue, sc->request_bufflen, id->len,
+			iue, scsi_bufflen(sc), id->len,
 			cmd->data_in_desc_cnt, cmd->data_out_desc_cnt);
 	}
 
@@ -268,13 +268,14 @@ static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
 
 rdma:
 	if (dma_map) {
-		nsg = dma_map_sg(iue->target->dev, sg, sc->use_sg, DMA_BIDIRECTIONAL);
+		nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
+				 DMA_BIDIRECTIONAL);
 		if (!nsg) {
-			eprintk("fail to map %p %d\n", iue, sc->use_sg);
+			eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc));
 			err = -EIO;
 			goto free_mem;
 		}
-		len = min(sc->request_bufflen, id->len);
+		len = min(scsi_bufflen(sc), id->len);
 	} else
 		len = id->len;
 
@@ -425,8 +426,8 @@ int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info,
 
 	sc->SCp.ptr = info;
 	memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE);
-	sc->request_bufflen = len;
-	sc->request_buffer = (void *) (unsigned long) addr;
+	sc->sdb.length = len;
+	sc->sdb.sglist = (void *) (unsigned long) addr;
 	sc->tag = tag;
 	err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun,
 				     cmd->tag);
-- 
1.5.3.1

[PATCH 32/32] isd200.c - use of scsi_data_buffer

[Boaz Harrosh]

  - This driver still bags on scsi_cmnd IO members, so need changing

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/usb/storage/isd200.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/storage/isd200.c b/drivers/usb/storage/isd200.c
index a624b4e..15e844d 100644
--- a/drivers/usb/storage/isd200.c
+++ b/drivers/usb/storage/isd200.c
@@ -415,14 +415,14 @@ static void isd200_set_srb(struct isd200_info *info,
 		sg_init_one(&info->sg, buff, bufflen);
 
 	srb->sc_data_direction = dir;
-	srb->request_buffer = buff ? &info->sg : NULL;
-	srb->request_bufflen = bufflen;
-	srb->use_sg = buff ? 1 : 0;
+	srb->sdb.sglist = buff ? &info->sg : NULL;
+	srb->sdb.length = bufflen;
+	srb->sdb.sg_count = buff ? 1 : 0;
 }
 
 static void isd200_srb_set_bufflen(struct scsi_cmnd *srb, unsigned bufflen)
 {
-	srb->request_bufflen = bufflen;
+	srb->sdb.length = bufflen;
 }
 
 
-- 
1.5.3.1

Re: [PATCH 22/32] qla1280: Indentation fix

[Matthew Wilcox]

On Wed, Oct 17, 2007 at 08:10:09PM +0200, Boaz Harrosh wrote:
> 
>   - Indentation fix of last patch. Don't be fooled by diff,
>     all I did was back-indent from open-bracket to close-bracket,
>     and remove the brackets.

Applying 'qla1280: Indentation fix'

Adds trailing whitespace.
.dotest/patch:90: sn_pci_set_vchan(ha->pdev, 
warning: 1 line adds trailing whitespaces.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."

Re: [patchset 0/33] scsi_data_buffer for after the last driver is converted

[FUJITA Tomonori]

On Wed, 17 Oct 2007 19:14:46 +0200
Boaz Harrosh <bharrosh@panasas.com> wrote:

> This is a resend of all the remaining drivers rebased
> to latest code. And once the entire tree is converted,
> move to scsi_data_buffer in scsi_cmnd.
> 
> The work is on top of Jens's for-linus branch which
> is effectively sglist-arch (+ last minute fixes)
> This is because sglist-arch was already rebased to
> latest scsi-misc through linus tree, merged with 
> the extra work done there on scsi-ml (and the drivers)
> (Thanks Jens)
> 
> summery of patches:
> 
> left over from scsi_eh last change
>   [PATCH 01/32] arm: fas216 Use scsi_eh API for REQUEST_SENSE invocation
> 
> lots and lots of drivers left:
>   [PATCH 02/32] isd200.c: use one-element sg list in issuing commands
>   [PATCH 03/32] usb: transport - convert to accessors and !use_sg code path removal
>   [PATCH 04/32] usb: protocol.c - convert to accessors and !use_sg code path removal
>   [PATCH 05/32] usb: shuttle_usbat.c - convert to accessors and !use_sg code path removal
>   [PATCH 06/32] usb: freecom.c & sddr09.c - convert to accessors and !use_sg cleanup
>   [PATCH 07/32] NCR5380 familly convert to accessors & !use_sg cleanup
>   [PATCH 08/32] arm: scsi convert to accessors and !use_sg cleanup
>   [PATCH 09/32] nsp_cs.c convert to data accessors and !use_sg cleanup
>   [PATCH 10/32] eata_pio.c: convert to accessors and !use_sg cleanup
>   [PATCH 11/32] a2091.c: convert to accessors and !use_sg cleanup
>   [PATCH 12/32] a3000.c: convert to accessors and !use_sg cleanup
>   [PATCH 13/32] aha1542.c: convert to accessors and !use_sg cleanup
>   [PATCH 14/32] atp870u.c: convert to accessors and !use_sg cleanup
>   [PATCH 15/32] fd_mcs.c: convert to accessors and !use_sg cleanup
>   [PATCH 16/32] imm.c: convert to accessors and !use_sg cleanup
>   [PATCH 17/32] ppa.c: convert to accessors and !use_sg cleanup
>   [PATCH 18/32] wd32c93.c: convert to accessors and !use_sg cleanup
>   [PATCH 19/32] qlogicpti.c: convert to accessors and !use_sg cleanup
>   [PATCH 20/32] in2000.c: convert to accessors and !use_sg cleanup
>   [PATCH 21/32] scsi_debug: convert to use the data buffer accessors
> 
> Tomo's patch cleaned up:
>    [PATCH 22/32] qla1280: convert to use the data buffer accessors
>    [PATCH 23/32] qla1280: Indentation fix
> 
>  I separated the indentation from the real change make
>  the patch humanly readable.

It doesn't hurt but I'm not sure how useful the separation is.

Re: [PATCH 27/32] scsi_data_buffer

[FUJITA Tomonori]

On Wed, 17 Oct 2007 20:21:15 +0200
Boaz Harrosh <bharrosh@panasas.com> wrote:

> 
>   In preparation for bidi we abstract all IO members of scsi_cmnd,
>   that will need to duplicate, into a substructure.
> 
>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
>     structure.
>   - Adjust accessors to new members.
>   - scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
>     scsi_cmnd. And work on it.
>   - Adjust scsi_init_io() and  scsi_release_buffers() for above
>     change.
>   - Fix other parts of scsi_lib/scsi.c to members migration. Use
>     accessors where appropriate.
> 
>   - Old I/O members are kept for backward compatibility, since
>     not all of scsi-ml/ul is converted yet. Once done they will
>     be removed in a closing patch. (Other wise the patchset will
>     not be bisectable)

(snip)

> @@ -114,6 +112,22 @@ struct scsi_cmnd {
>  	int result;		/* Status code from lower level driver */
>  
>  	unsigned char tag;	/* SCSI-II queued command tag */
> +
> +	union {
> +		struct scsi_data_buffer sdb;
> +		/*
> +		 * FIXME: Here for compatibility with unconverted drivers.
> +		 *        Must be kept in sync with exact type and order
> +		 *        of struct scsi_data_buffer members.
> +		 */
> +		struct {
> +			unsigned __deprecated request_bufflen;
> +			int __deprecated resid;
> +			unsigned short __deprecated use_sg;
> +			unsigned short __deprecated place_holder_sg_alloc;
> +			void __deprecated *request_buffer;
> +		};
> +	};
>  };

If we add something like this, why couldn't we merge the
scsi_data_buffer patchset when I submitted last month?

I thought that I wait you to fix all the old LLDs, then will send a
clean scsi_data_buffer patchset.

Re: [PATCH 27/32] scsi_data_buffer

[Matthew Wilcox]

On Wed, Oct 17, 2007 at 08:21:15PM +0200, Boaz Harrosh wrote:
>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
>     structure.

> +struct scsi_data_buffer {
> +	unsigned length;
> +	int resid;
> +	unsigned short sg_count;
> +	unsigned short alloc_sg_count;
> +	struct scatterlist* sglist;
> +};

This has exactly the problems I thought it would have.  Due to alignment
rules, it grows the scsi_cmnd from 368 to 376 bytes on x86-64.
It remains at 272 bytes on i386 though, which is some consolation.
By porting the patch I had for shrinking the scsi_cmnd, I can get it
down to 352 bytes, but not as far as the 344 bytes I had it at before.

The problem is the padding at the *end* of scsi_data_buffer (er, after I
rearrange it in the patch below).  There's nothing we can realistically
put in it, given that we don't want to expand scsi_data_buffer's size on
32-bit machines.  I have a fix ... but I don't think you'll like it.
I certainly don't.  But it does get us back down to 344 bytes.

Updated patch below.  I'm fully expecting the 'result' shenanigan to get
it NACKed, but I'd like to see if it inspires anyone else to a more
creative way of saving this space.

---

Thanks to acme's pahole utility, I found some places where we can save
a lot of bytes in scsi_cmnd, just by rearranging struct elements and
reducing the size of some elements.  We go from 272 to 260 bytes on x86
and from 368 to 344 bytes on x86-64.

 - eh_eflags had a 4-byte hole after it on 64-bit.  In fact, this has
   value 0 or 1, so reduce it to an unsigned char, and put it with the
   other chars in scsi_cmnd.  Saves 8 bytes on 64-bit.
 - sc_data_direction has a value from 0-3, so make it an unsigned char
   rather than an enum.  Saves at least 4 bytes.
 - Putting 'tag' with the other char elements saves another 4 bytes
 - Moving 'result' into the union with the deprecated members saves 8
   bytes on 64-bit.

diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 047ffe6..2b10779 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -13,22 +13,21 @@ struct Scsi_Host;
 struct scsi_device;
 
 struct scsi_data_buffer {
+	struct scatterlist* sglist;
 	unsigned length;
 	int resid;
 	unsigned short sg_count;
 	unsigned short alloc_sg_count;
-	struct scatterlist* sglist;
 };
 
 /* embedded in scsi_cmnd */
 struct scsi_pointer {
 	char *ptr;		/* data pointer */
-	int this_residual;	/* left in this buffer */
 	struct scatterlist *buffer;	/* which buffer */
+	dma_addr_t dma_handle;
+	int this_residual;	/* left in this buffer */
 	int buffers_residual;	/* how many buffers left */
 
-        dma_addr_t dma_handle;
-
 	volatile int Status;
 	volatile int Message;
 	volatile int have_data_in;
@@ -40,7 +39,6 @@ struct scsi_cmnd {
 	struct scsi_device *device;
 	struct list_head list;  /* scsi_cmnd participates in queue lists */
 	struct list_head eh_entry; /* entry for the host eh_cmd_q */
-	int eh_eflags;		/* Used by error handlr */
 
 	/*
 	 * A SCSI Command is assigned a nonzero serial_number before passed
@@ -64,7 +62,9 @@ struct scsi_cmnd {
 	int timeout_per_command;
 
 	unsigned char cmd_len;
-	enum dma_data_direction sc_data_direction;
+	unsigned char eh_eflags;		/* Used by error handler */
+	unsigned char sc_data_direction;	/* enum dma_data_direction */
+	unsigned char tag;	/* SCSI-II queued command tag */
 
 	/* These elements define the operation we are about to perform */
 #define MAX_COMMAND_SIZE	16
@@ -109,10 +109,6 @@ struct scsi_cmnd {
 					 * obtained by scsi_malloc is guaranteed
 					 * to be at an address < 16Mb). */
 
-	int result;		/* Status code from lower level driver */
-
-	unsigned char tag;	/* SCSI-II queued command tag */
-
 	union {
 		struct scsi_data_buffer sdb;
 		/*
@@ -121,11 +117,12 @@ struct scsi_cmnd {
 		 *        of struct scsi_data_buffer members.
 		 */
 		struct {
+			void __deprecated *request_buffer;
 			unsigned __deprecated request_bufflen;
 			int __deprecated resid;
 			unsigned short __deprecated use_sg;
 			unsigned short __deprecated place_holder_sg_alloc;
-			void __deprecated *request_buffer;
+			int result; /* Status code from lower level driver */
 		};
 	};
 };

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."

Re: [PATCH 27/32] scsi_data_buffer

[Benny Halevy]

On Oct. 18, 2007, 2:47 +0200, Matthew Wilcox <matthew@wil.cx> wrote:
> On Wed, Oct 17, 2007 at 08:21:15PM +0200, Boaz Harrosh wrote:
>>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
>>     structure.
> 
>> +struct scsi_data_buffer {
>> +	unsigned length;
>> +	int resid;
>> +	unsigned short sg_count;
>> +	unsigned short alloc_sg_count;
>> +	struct scatterlist* sglist;
>> +};
> 
> This has exactly the problems I thought it would have.  Due to alignment
> rules, it grows the scsi_cmnd from 368 to 376 bytes on x86-64.
> It remains at 272 bytes on i386 though, which is some consolation.
> By porting the patch I had for shrinking the scsi_cmnd, I can get it
> down to 352 bytes, but not as far as the 344 bytes I had it at before.
> 
> The problem is the padding at the *end* of scsi_data_buffer (er, after I
> rearrange it in the patch below).  There's nothing we can realistically
> put in it, given that we don't want to expand scsi_data_buffer's size on
> 32-bit machines.  I have a fix ... but I don't think you'll like it.
> I certainly don't.  But it does get us back down to 344 bytes.
> 
> Updated patch below.  I'm fully expecting the 'result' shenanigan to get
> it NACKed, but I'd like to see if it inspires anyone else to a more
> creative way of saving this space.


yeah. The sglist pointer shuffle makes sense and so are the field type
changes and coalescing, but the union holding the deprecated fields
of scsi_data_buff is going away.

#pragma pack(4) before struct scsi_cmnd
(followed by #pragma pack()) should do the trick 
by saving member padding bytes. As a general rule I don't like pragma's
but this one works, is easy to understand, and is pretty standard.

> 
> ---
> 
> Thanks to acme's pahole utility, I found some places where we can save
> a lot of bytes in scsi_cmnd, just by rearranging struct elements and
> reducing the size of some elements.  We go from 272 to 260 bytes on x86
> and from 368 to 344 bytes on x86-64.
> 
>  - eh_eflags had a 4-byte hole after it on 64-bit.  In fact, this has
>    value 0 or 1, so reduce it to an unsigned char, and put it with the
>    other chars in scsi_cmnd.  Saves 8 bytes on 64-bit.
>  - sc_data_direction has a value from 0-3, so make it an unsigned char
>    rather than an enum.  Saves at least 4 bytes.
>  - Putting 'tag' with the other char elements saves another 4 bytes
>  - Moving 'result' into the union with the deprecated members saves 8
>    bytes on 64-bit.
> 
> diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
> index 047ffe6..2b10779 100644
> --- a/include/scsi/scsi_cmnd.h
> +++ b/include/scsi/scsi_cmnd.h
> @@ -13,22 +13,21 @@ struct Scsi_Host;
>  struct scsi_device;
>  
>  struct scsi_data_buffer {
> +	struct scatterlist* sglist;
>  	unsigned length;
>  	int resid;
>  	unsigned short sg_count;
>  	unsigned short alloc_sg_count;
> -	struct scatterlist* sglist;
>  };
>  
>  /* embedded in scsi_cmnd */
>  struct scsi_pointer {
>  	char *ptr;		/* data pointer */
> -	int this_residual;	/* left in this buffer */
>  	struct scatterlist *buffer;	/* which buffer */
> +	dma_addr_t dma_handle;
> +	int this_residual;	/* left in this buffer */
>  	int buffers_residual;	/* how many buffers left */
>  
> -        dma_addr_t dma_handle;
> -
>  	volatile int Status;
>  	volatile int Message;
>  	volatile int have_data_in;
> @@ -40,7 +39,6 @@ struct scsi_cmnd {
>  	struct scsi_device *device;
>  	struct list_head list;  /* scsi_cmnd participates in queue lists */
>  	struct list_head eh_entry; /* entry for the host eh_cmd_q */
> -	int eh_eflags;		/* Used by error handlr */
>  
>  	/*
>  	 * A SCSI Command is assigned a nonzero serial_number before passed
> @@ -64,7 +62,9 @@ struct scsi_cmnd {
>  	int timeout_per_command;
>  
>  	unsigned char cmd_len;
> -	enum dma_data_direction sc_data_direction;
> +	unsigned char eh_eflags;		/* Used by error handler */
> +	unsigned char sc_data_direction;	/* enum dma_data_direction */
> +	unsigned char tag;	/* SCSI-II queued command tag */
>  
>  	/* These elements define the operation we are about to perform */
>  #define MAX_COMMAND_SIZE	16
> @@ -109,10 +109,6 @@ struct scsi_cmnd {
>  					 * obtained by scsi_malloc is guaranteed
>  					 * to be at an address < 16Mb). */
>  
> -	int result;		/* Status code from lower level driver */
> -
> -	unsigned char tag;	/* SCSI-II queued command tag */
> -
>  	union {
>  		struct scsi_data_buffer sdb;
>  		/*
> @@ -121,11 +117,12 @@ struct scsi_cmnd {
>  		 *        of struct scsi_data_buffer members.
>  		 */
>  		struct {
> +			void __deprecated *request_buffer;
>  			unsigned __deprecated request_bufflen;
>  			int __deprecated resid;
>  			unsigned short __deprecated use_sg;
>  			unsigned short __deprecated place_holder_sg_alloc;
> -			void __deprecated *request_buffer;
> +			int result; /* Status code from lower level driver */
>  		};
>  	};
>  };
> 

[PATCH 33/33] Remove Compatibility mode hack from scsi_cmnd

[Boaz Harrosh]

  - So we can separate the move to scsi_data_buffer
    into several patches, we have introduced a compatibility
    hack in the very first patch, that let the patchset be
    completely bisectable. Now that the entire tree is converted
    We can finally remove OLD I/O members from scsi_cmnd.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 include/scsi/scsi_cmnd.h |   16 +---------------
 1 files changed, 1 insertions(+), 15 deletions(-)

diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 047ffe6..8b8759c 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -113,21 +113,7 @@ struct scsi_cmnd {
 
 	unsigned char tag;	/* SCSI-II queued command tag */
 
-	union {
-		struct scsi_data_buffer sdb;
-		/*
-		 * FIXME: Here for compatibility with unconverted drivers.
-		 *        Must be kept in sync with exact type and order
-		 *        of struct scsi_data_buffer members.
-		 */
-		struct {
-			unsigned __deprecated request_bufflen;
-			int __deprecated resid;
-			unsigned short __deprecated use_sg;
-			unsigned short __deprecated place_holder_sg_alloc;
-			void __deprecated *request_buffer;
-		};
-	};
+	struct scsi_data_buffer sdb;
 };
 
 extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
-- 
1.5.3.1

Re: [PATCH 27/32] scsi_data_buffer

[Boaz Harrosh]

On Thu, Oct 18 2007 at 1:40 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> On Wed, 17 Oct 2007 20:21:15 +0200
> Boaz Harrosh <bharrosh@panasas.com> wrote:
> 
>>   In preparation for bidi we abstract all IO members of scsi_cmnd,
>>   that will need to duplicate, into a substructure.
>>
>>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
>>     structure.
>>   - Adjust accessors to new members.
>>   - scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
>>     scsi_cmnd. And work on it.
>>   - Adjust scsi_init_io() and  scsi_release_buffers() for above
>>     change.
>>   - Fix other parts of scsi_lib/scsi.c to members migration. Use
>>     accessors where appropriate.
>>
>>   - Old I/O members are kept for backward compatibility, since
>>     not all of scsi-ml/ul is converted yet. Once done they will
>>     be removed in a closing patch. (Other wise the patchset will
>>     not be bisectable)
> 
> (snip)
> 
>> @@ -114,6 +112,22 @@ struct scsi_cmnd {
>>  	int result;		/* Status code from lower level driver */
>>  
>>  	unsigned char tag;	/* SCSI-II queued command tag */
>> +
>> +	union {
>> +		struct scsi_data_buffer sdb;
>> +		/*
>> +		 * FIXME: Here for compatibility with unconverted drivers.
>> +		 *        Must be kept in sync with exact type and order
>> +		 *        of struct scsi_data_buffer members.
>> +		 */
>> +		struct {
>> +			unsigned __deprecated request_bufflen;
>> +			int __deprecated resid;
>> +			unsigned short __deprecated use_sg;
>> +			unsigned short __deprecated place_holder_sg_alloc;
>> +			void __deprecated *request_buffer;
>> +		};
>> +	};
>>  };
> 
> If we add something like this, why couldn't we merge the
> scsi_data_buffer patchset when I submitted last month?
> 
> I thought that I wait you to fix all the old LLDs, then will send a
> clean scsi_data_buffer patchset.

We do have all the old LLDs fixed. After this patchset the entire tree
is clean. I have just forgot to send the last [33/33] patch that removes
this. I have just sent it now, sorry.
(The change log above explains exactly why this is done here)

Boaz

Re: [PATCH 27/32] scsi_data_buffer

[FUJITA Tomonori]

On Thu, 18 Oct 2007 09:51:10 +0200
Boaz Harrosh <bharrosh@panasas.com> wrote:

> On Thu, Oct 18 2007 at 1:40 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> > On Wed, 17 Oct 2007 20:21:15 +0200
> > Boaz Harrosh <bharrosh@panasas.com> wrote:
> > 
> >>   In preparation for bidi we abstract all IO members of scsi_cmnd,
> >>   that will need to duplicate, into a substructure.
> >>
> >>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
> >>     structure.
> >>   - Adjust accessors to new members.
> >>   - scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
> >>     scsi_cmnd. And work on it.
> >>   - Adjust scsi_init_io() and  scsi_release_buffers() for above
> >>     change.
> >>   - Fix other parts of scsi_lib/scsi.c to members migration. Use
> >>     accessors where appropriate.
> >>
> >>   - Old I/O members are kept for backward compatibility, since
> >>     not all of scsi-ml/ul is converted yet. Once done they will
> >>     be removed in a closing patch. (Other wise the patchset will
> >>     not be bisectable)
> > 
> > (snip)
> > 
> >> @@ -114,6 +112,22 @@ struct scsi_cmnd {
> >>  	int result;		/* Status code from lower level driver */
> >>  
> >>  	unsigned char tag;	/* SCSI-II queued command tag */
> >> +
> >> +	union {
> >> +		struct scsi_data_buffer sdb;
> >> +		/*
> >> +		 * FIXME: Here for compatibility with unconverted drivers.
> >> +		 *        Must be kept in sync with exact type and order
> >> +		 *        of struct scsi_data_buffer members.
> >> +		 */
> >> +		struct {
> >> +			unsigned __deprecated request_bufflen;
> >> +			int __deprecated resid;
> >> +			unsigned short __deprecated use_sg;
> >> +			unsigned short __deprecated place_holder_sg_alloc;
> >> +			void __deprecated *request_buffer;
> >> +		};
> >> +	};
> >>  };
> > 
> > If we add something like this, why couldn't we merge the
> > scsi_data_buffer patchset when I submitted last month?
> > 
> > I thought that I wait you to fix all the old LLDs, then will send a
> > clean scsi_data_buffer patchset.
> 
> We do have all the old LLDs fixed. After this patchset the entire tree
> is clean. I have just forgot to send the last [33/33] patch that removes
> this. I have just sent it now, sorry.
> (The change log above explains exactly why this is done here)

As I said, I can't see why we need this compatibility hack in the
first place.

We need to wait patches 1-26 to be merged. After that, we can merge
clean scsi_data_buffer patchset (without the compatibility hack).

Re: [PATCH 27/32] scsi_data_buffer

[Matthew Wilcox]

On Thu, Oct 18, 2007 at 08:59:58AM +0200, Benny Halevy wrote:
> yeah. The sglist pointer shuffle makes sense and so are the field type
> changes and coalescing, but the union holding the deprecated fields
> of scsi_data_buff is going away.

Indeed.  We could always do ...

	union {
		struct scsi_data_pointer;
		struct {
			char _padding_[sizeof(struct scsi_data_pointer)];
			int result;
		}
	}

But that might set a new record of depths of obfuscation.

> #pragma pack(4) before struct scsi_cmnd
> (followed by #pragma pack()) should do the trick 
> by saving member padding bytes. As a general rule I don't like pragma's
> but this one works, is easy to understand, and is pretty standard.

But it might well have the effect of pessimising accesses to the struct,
and accesses to scsi_cmnd are pretty hot.  I've seen gcc revert to byte
loads and stores to packed structs in the past.  Maybe it's got better
now.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."

Re: [PATCH 27/32] scsi_data_buffer

[Boaz Harrosh]

On Thu, Oct 18 2007 at 8:59 +0200, Benny Halevy <bhalevy@panasas.com> wrote:
>>
>> Updated patch below.  I'm fully expecting the 'result' shenanigan to get
>> it NACKed, but I'd like to see if it inspires anyone else to a more
>> creative way of saving this space.
> 
> 
> yeah. The sglist pointer shuffle makes sense and so are the field type
> changes and coalescing, but the union holding the deprecated fields
> of scsi_data_buff is going away.
> 
> #pragma pack(4) before struct scsi_cmnd
> (followed by #pragma pack()) should do the trick 
> by saving member padding bytes. As a general rule I don't like pragma's
> but this one works, is easy to understand, and is pretty standard.
> 
>> ---
>>

Sorry Matthew, my mistake I forgot to send the last [33/33] patch
this here should be done on top of that last one.

I will grab your tool and play with it. The sglist pointer shuffle
is good, and also I know that if you put the scsi_data_buffer
at the beginning of scsi_cmnd, than you can fill the holes with small types
following the sub-structure. I'll give it a try.

Boaz

Re: [PATCH 27/32] scsi_data_buffer

[Boaz Harrosh]

On Thu, Oct 18 2007 at 9:57 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> On Thu, 18 Oct 2007 09:51:10 +0200
> Boaz Harrosh <bharrosh@panasas.com> wrote:
> 
>> On Thu, Oct 18 2007 at 1:40 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
>>> On Wed, 17 Oct 2007 20:21:15 +0200
>>> Boaz Harrosh <bharrosh@panasas.com> wrote:
>>>
>>>>   In preparation for bidi we abstract all IO members of scsi_cmnd,
>>>>   that will need to duplicate, into a substructure.
>>>>
>>>>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
>>>>     structure.
>>>>   - Adjust accessors to new members.
>>>>   - scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
>>>>     scsi_cmnd. And work on it.
>>>>   - Adjust scsi_init_io() and  scsi_release_buffers() for above
>>>>     change.
>>>>   - Fix other parts of scsi_lib/scsi.c to members migration. Use
>>>>     accessors where appropriate.
>>>>
>>>>   - Old I/O members are kept for backward compatibility, since
>>>>     not all of scsi-ml/ul is converted yet. Once done they will
>>>>     be removed in a closing patch. (Other wise the patchset will
>>>>     not be bisectable)
>>> (snip)
>>>
>>>> @@ -114,6 +112,22 @@ struct scsi_cmnd {
>>>>  	int result;		/* Status code from lower level driver */
>>>>  
>>>>  	unsigned char tag;	/* SCSI-II queued command tag */
>>>> +
>>>> +	union {
>>>> +		struct scsi_data_buffer sdb;
>>>> +		/*
>>>> +		 * FIXME: Here for compatibility with unconverted drivers.
>>>> +		 *        Must be kept in sync with exact type and order
>>>> +		 *        of struct scsi_data_buffer members.
>>>> +		 */
>>>> +		struct {
>>>> +			unsigned __deprecated request_bufflen;
>>>> +			int __deprecated resid;
>>>> +			unsigned short __deprecated use_sg;
>>>> +			unsigned short __deprecated place_holder_sg_alloc;
>>>> +			void __deprecated *request_buffer;
>>>> +		};
>>>> +	};
>>>>  };
>>> If we add something like this, why couldn't we merge the
>>> scsi_data_buffer patchset when I submitted last month?
>>>
>>> I thought that I wait you to fix all the old LLDs, then will send a
>>> clean scsi_data_buffer patchset.
>> We do have all the old LLDs fixed. After this patchset the entire tree
>> is clean. I have just forgot to send the last [33/33] patch that removes
>> this. I have just sent it now, sorry.
>> (The change log above explains exactly why this is done here)
> 
> As I said, I can't see why we need this compatibility hack in the
> first place.
> 
> We need to wait patches 1-26 to be merged. After that, we can merge
> clean scsi_data_buffer patchset (without the compatibility hack).
> 
No.
It is here so we can separate the patches 27 to 32 and still be
bisect-able and running at each patch. Other wise all 27-32 patches
must be a single patch. This is the only reason why this is done.
At patch [33/33] this is removed and be done with.
James and Linus have stated lots of times that they want every stage
of the tree compiling running and complete. I took it to hart, and
I don't mind the extra effort.

Boaz

Re: [PATCH 27/32] scsi_data_buffer

[Benny Halevy]

On Oct. 18, 2007, 10:06 +0200, Matthew Wilcox <matthew@wil.cx> wrote:
> On Thu, Oct 18, 2007 at 08:59:58AM +0200, Benny Halevy wrote:
>> yeah. The sglist pointer shuffle makes sense and so are the field type
>> changes and coalescing, but the union holding the deprecated fields
>> of scsi_data_buff is going away.
> 
> Indeed.  We could always do ...
> 
> 	union {
> 		struct scsi_data_pointer;
> 		struct {
> 			char _padding_[sizeof(struct scsi_data_pointer)];
> 			int result;
> 		}
> 	}
> 
> But that might set a new record of depths of obfuscation.

agreed :)

> 
>> #pragma pack(4) before struct scsi_cmnd
>> (followed by #pragma pack()) should do the trick 
>> by saving member padding bytes. As a general rule I don't like pragma's
>> but this one works, is easy to understand, and is pretty standard.
> 
> But it might well have the effect of pessimising accesses to the struct,
> and accesses to scsi_cmnd are pretty hot.  I've seen gcc revert to byte
> loads and stores to packed structs in the past.  Maybe it's got better
> now.
> 

that's why I suggested pack(4) and not pack(1), assuming 4-byte alignment
is still as efficient as 8-byte alignment on most common 64 bit architectures.

Re: [PATCH 27/32] scsi_data_buffer

[FUJITA Tomonori]

On Thu, 18 Oct 2007 10:27:34 +0200
Boaz Harrosh <bharrosh@panasas.com> wrote:

> On Thu, Oct 18 2007 at 9:57 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> > On Thu, 18 Oct 2007 09:51:10 +0200
> > Boaz Harrosh <bharrosh@panasas.com> wrote:
> > 
> >> On Thu, Oct 18 2007 at 1:40 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> >>> On Wed, 17 Oct 2007 20:21:15 +0200
> >>> Boaz Harrosh <bharrosh@panasas.com> wrote:
> >>>
> >>>>   In preparation for bidi we abstract all IO members of scsi_cmnd,
> >>>>   that will need to duplicate, into a substructure.
> >>>>
> >>>>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
> >>>>     structure.
> >>>>   - Adjust accessors to new members.
> >>>>   - scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
> >>>>     scsi_cmnd. And work on it.
> >>>>   - Adjust scsi_init_io() and  scsi_release_buffers() for above
> >>>>     change.
> >>>>   - Fix other parts of scsi_lib/scsi.c to members migration. Use
> >>>>     accessors where appropriate.
> >>>>
> >>>>   - Old I/O members are kept for backward compatibility, since
> >>>>     not all of scsi-ml/ul is converted yet. Once done they will
> >>>>     be removed in a closing patch. (Other wise the patchset will
> >>>>     not be bisectable)
> >>> (snip)
> >>>
> >>>> @@ -114,6 +112,22 @@ struct scsi_cmnd {
> >>>>  	int result;		/* Status code from lower level driver */
> >>>>  
> >>>>  	unsigned char tag;	/* SCSI-II queued command tag */
> >>>> +
> >>>> +	union {
> >>>> +		struct scsi_data_buffer sdb;
> >>>> +		/*
> >>>> +		 * FIXME: Here for compatibility with unconverted drivers.
> >>>> +		 *        Must be kept in sync with exact type and order
> >>>> +		 *        of struct scsi_data_buffer members.
> >>>> +		 */
> >>>> +		struct {
> >>>> +			unsigned __deprecated request_bufflen;
> >>>> +			int __deprecated resid;
> >>>> +			unsigned short __deprecated use_sg;
> >>>> +			unsigned short __deprecated place_holder_sg_alloc;
> >>>> +			void __deprecated *request_buffer;
> >>>> +		};
> >>>> +	};
> >>>>  };
> >>> If we add something like this, why couldn't we merge the
> >>> scsi_data_buffer patchset when I submitted last month?
> >>>
> >>> I thought that I wait you to fix all the old LLDs, then will send a
> >>> clean scsi_data_buffer patchset.
> >> We do have all the old LLDs fixed. After this patchset the entire tree
> >> is clean. I have just forgot to send the last [33/33] patch that removes
> >> this. I have just sent it now, sorry.
> >> (The change log above explains exactly why this is done here)
> > 
> > As I said, I can't see why we need this compatibility hack in the
> > first place.
> > 
> > We need to wait patches 1-26 to be merged. After that, we can merge
> > clean scsi_data_buffer patchset (without the compatibility hack).
> > 
> No.
> It is here so we can separate the patches 27 to 32 and still be
> bisect-able and running at each patch. Other wise all 27-32 patches
> must be a single patch.

So why can they be a single patch?

Re: [PATCH 27/32] scsi_data_buffer

[Matthew Wilcox]

On Thu, Oct 18, 2007 at 10:16:38AM +0200, Boaz Harrosh wrote:
> Sorry Matthew, my mistake I forgot to send the last [33/33] patch
> this here should be done on top of that last one.

Yeah.  I'll rebase the series of 4 patches I just sent on top of it when
I wake up in the morning.

> I will grab your tool and play with it. The sglist pointer shuffle
> is good, and also I know that if you put the scsi_data_buffer
> at the beginning of scsi_cmnd, than you can fill the holes with small types
> following the sub-structure. I'll give it a try.

No, that doesn't work ;-(

I think a macro to hide the ugliness of my earlier suggestion might fly.
Something like ...

#define STRUCT_PACK(a, b, c, d) \
	union { a; struct { \
		char _packed_ ## __stringify(a) [sizeof(a) - sizeof(c) + sizeof(d)]; \
		b; \
	}; }

then we use it like:

struct scsi_cmnd {
	...
	STRUCT_PACK(struct scsi_data_buffer sdb, int result,
						sizeof(long), sizeof(int));
}

Even that's still pretty foul (and i have my grave doubts about using
stringify in that manner).  It's definitely past my bedtime now ... but
a hack like that could save us another 8 bytes on x86-64.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."

Re: [PATCH 27/32] scsi_data_buffer

[FUJITA Tomonori]

On Thu, 18 Oct 2007 17:45:21 +0900
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:

> On Thu, 18 Oct 2007 10:27:34 +0200
> Boaz Harrosh <bharrosh@panasas.com> wrote:
> 
> > On Thu, Oct 18 2007 at 9:57 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> > > On Thu, 18 Oct 2007 09:51:10 +0200
> > > Boaz Harrosh <bharrosh@panasas.com> wrote:
> > > 
> > >> On Thu, Oct 18 2007 at 1:40 +0200, FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> > >>> On Wed, 17 Oct 2007 20:21:15 +0200
> > >>> Boaz Harrosh <bharrosh@panasas.com> wrote:
> > >>>
> > >>>>   In preparation for bidi we abstract all IO members of scsi_cmnd,
> > >>>>   that will need to duplicate, into a substructure.
> > >>>>
> > >>>>   - Group all IO members of scsi_cmnd into a scsi_data_buffer
> > >>>>     structure.
> > >>>>   - Adjust accessors to new members.
> > >>>>   - scsi_{alloc,free}_sgtable receive a scsi_data_buffer instead of
> > >>>>     scsi_cmnd. And work on it.
> > >>>>   - Adjust scsi_init_io() and  scsi_release_buffers() for above
> > >>>>     change.
> > >>>>   - Fix other parts of scsi_lib/scsi.c to members migration. Use
> > >>>>     accessors where appropriate.
> > >>>>
> > >>>>   - Old I/O members are kept for backward compatibility, since
> > >>>>     not all of scsi-ml/ul is converted yet. Once done they will
> > >>>>     be removed in a closing patch. (Other wise the patchset will
> > >>>>     not be bisectable)
> > >>> (snip)
> > >>>
> > >>>> @@ -114,6 +112,22 @@ struct scsi_cmnd {
> > >>>>  	int result;		/* Status code from lower level driver */
> > >>>>  
> > >>>>  	unsigned char tag;	/* SCSI-II queued command tag */
> > >>>> +
> > >>>> +	union {
> > >>>> +		struct scsi_data_buffer sdb;
> > >>>> +		/*
> > >>>> +		 * FIXME: Here for compatibility with unconverted drivers.
> > >>>> +		 *        Must be kept in sync with exact type and order
> > >>>> +		 *        of struct scsi_data_buffer members.
> > >>>> +		 */
> > >>>> +		struct {
> > >>>> +			unsigned __deprecated request_bufflen;
> > >>>> +			int __deprecated resid;
> > >>>> +			unsigned short __deprecated use_sg;
> > >>>> +			unsigned short __deprecated place_holder_sg_alloc;
> > >>>> +			void __deprecated *request_buffer;
> > >>>> +		};
> > >>>> +	};
> > >>>>  };
> > >>> If we add something like this, why couldn't we merge the
> > >>> scsi_data_buffer patchset when I submitted last month?
> > >>>
> > >>> I thought that I wait you to fix all the old LLDs, then will send a
> > >>> clean scsi_data_buffer patchset.
> > >> We do have all the old LLDs fixed. After this patchset the entire tree
> > >> is clean. I have just forgot to send the last [33/33] patch that removes
> > >> this. I have just sent it now, sorry.
> > >> (The change log above explains exactly why this is done here)
> > > 
> > > As I said, I can't see why we need this compatibility hack in the
> > > first place.
> > > 
> > > We need to wait patches 1-26 to be merged. After that, we can merge
> > > clean scsi_data_buffer patchset (without the compatibility hack).
> > > 
> > No.
> > It is here so we can separate the patches 27 to 32 and still be
> > bisect-able and running at each patch. Other wise all 27-32 patches
> > must be a single patch.
> 
> So why can they be a single patch?

Oops, why can't they be a single patch?

They are logically one change. So I think that it would be better to
have one logical change (even though a bit large) rather than adding
the compatibility hack (and tgt's shim hack) and then removing them.

Re: [PATCH 27/32] scsi_data_buffer

[Boaz Harrosh]

On Thu, Oct 18 2007 at 10:54 +0200, Matthew Wilcox <matthew@wil.cx> wrote:
> On Thu, Oct 18, 2007 at 10:16:38AM +0200, Boaz Harrosh wrote:
>> Sorry Matthew, my mistake I forgot to send the last [33/33] patch
>> this here should be done on top of that last one.
> 
> Yeah.  I'll rebase the series of 4 patches I just sent on top of it when
> I wake up in the morning.
> 
>> I will grab your tool and play with it. The sglist pointer shuffle
>> is good, and also I know that if you put the scsi_data_buffer
>> at the beginning of scsi_cmnd, than you can fill the holes with small types
>> following the sub-structure. I'll give it a try.
> 
> No, that doesn't work ;-(
> 
> I think a macro to hide the ugliness of my earlier suggestion might fly.
> Something like ...
> 
> #define STRUCT_PACK(a, b, c, d) \
> 	union { a; struct { \
> 		char _packed_ ## __stringify(a) [sizeof(a) - sizeof(c) + sizeof(d)]; \
> 		b; \
> 	}; }
> 
> then we use it like:
> 
> struct scsi_cmnd {
> 	...
> 	STRUCT_PACK(struct scsi_data_buffer sdb, int result,
> 						sizeof(long), sizeof(int));
> }
> 
> Even that's still pretty foul (and i have my grave doubts about using
> stringify in that manner).  It's definitely past my bedtime now ... but
> a hack like that could save us another 8 bytes on x86-64.
> 

You lost me.
What union, please look at patch [33/33]

Boaz

Re: [PATCH 27/32] scsi_data_buffer

[Alan Stern]

On Thu, 18 Oct 2007, Matthew Wilcox wrote:

> > I will grab your tool and play with it. The sglist pointer shuffle
> > is good, and also I know that if you put the scsi_data_buffer
> > at the beginning of scsi_cmnd, than you can fill the holes with small types
> > following the sub-structure. I'll give it a try.
> 
> No, that doesn't work ;-(
> 
> I think a macro to hide the ugliness of my earlier suggestion might fly.
> Something like ...
> 
> #define STRUCT_PACK(a, b, c, d) \
> 	union { a; struct { \
> 		char _packed_ ## __stringify(a) [sizeof(a) - sizeof(c) + sizeof(d)]; \
> 		b; \
> 	}; }
> 
> then we use it like:
> 
> struct scsi_cmnd {
> 	...
> 	STRUCT_PACK(struct scsi_data_buffer sdb, int result,
> 						sizeof(long), sizeof(int));
> }
> 
> Even that's still pretty foul (and i have my grave doubts about using
> stringify in that manner).  It's definitely past my bedtime now ... but
> a hack like that could save us another 8 bytes on x86-64.

This may seem heretical, but I doubt there's much point to saving a few 
bytes if it's going to incur this much work and confusion.  Rearranging 
the order of structure members is fine, it's easy, it won't bother 
anybody.  But this sort of thing is just beyond the bounds of reason.

Alan Stern

Re: [PATCH 27/32] scsi_data_buffer

[Matthew Wilcox]

On Thu, Oct 18, 2007 at 10:26:58AM -0400, Alan Stern wrote:
> > Even that's still pretty foul (and i have my grave doubts about using
> > stringify in that manner).  It's definitely past my bedtime now ... but
> > a hack like that could save us another 8 bytes on x86-64.
> 
> This may seem heretical, but I doubt there's much point to saving a few 
> bytes if it's going to incur this much work and confusion.  Rearranging 
> the order of structure members is fine, it's easy, it won't bother 
> anybody.  But this sort of thing is just beyond the bounds of reason.

That's a valid point of view.  But we're just 24 bytes shy of going down
from 6 cachelines to 5.  I don't have performance numbers yet, but the
memory savings are significant; we switch from 10 cmds per 4k slab page to
12 cmds per 4k slab page.  By the way, after my patch 4/4 getting rid of
transfersize, we're down to 256 bytes on i386.  That's 16 cmds per 4k slab
page, so we alloc 25% fewer pages to scsi_cmnds.  That's a *huge* win.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."

Re: [PATCH 22/32 ver2] qla1280: Indentation fix

[Boaz Harrosh]

  - Indentation fix of last patch. Don't be fooled by diff,
    all I did was back-indent from open-bracket to close-bracket,
    and remove the brackets.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 drivers/scsi/qla1280.c |  290 ++++++++++++++++++++++++------------------------
 1 files changed, 143 insertions(+), 147 deletions(-)

diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 7a18b1a..bf07b17 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2882,99 +2882,97 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 		/* Setup packet address segment pointer. */
 		dword_ptr = (u32 *)&pkt->dseg_0_address;
 
-		{	/* FIXME:Indentation in next patch */
-			/* Load command entry data segments. */
-			for_each_sg(sg, s, seg_cnt, cnt) {
-				if (cnt == 2)
+		/* Load command entry data segments. */
+		for_each_sg(sg, s, seg_cnt, cnt) {
+			if (cnt == 2)
+				break;
+			dma_handle = sg_dma_address(s);
+#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
+			if (ha->flags.use_pci_vchannel)
+				sn_pci_set_vchan(ha->pdev,
+						(unsigned long *)&dma_handle,
+						 SCSI_BUS_32(cmd));
+#endif
+			*dword_ptr++ =
+				cpu_to_le32(pci_dma_lo32(dma_handle));
+			*dword_ptr++ =
+				cpu_to_le32(pci_dma_hi32(dma_handle));
+			*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
+			dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
+				cpu_to_le32(pci_dma_hi32(dma_handle)),
+				cpu_to_le32(pci_dma_lo32(dma_handle)),
+				cpu_to_le32(sg_dma_len(sg_next(s))));
+			remseg--;
+		}
+		dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
+			"command packet data - b %i, t %i, l %i \n",
+			SCSI_BUS_32(cmd), SCSI_TCN_32(cmd),
+			SCSI_LUN_32(cmd));
+		qla1280_dump_buffer(5, (char *)pkt,
+				    REQUEST_ENTRY_SIZE);
+
+		/*
+		 * Build continuation packets.
+		 */
+		dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
+			"remains\n", seg_cnt);
+
+		while (remseg > 0) {
+			/* Update sg start */
+			sg = s;
+			/* Adjust ring index. */
+			ha->req_ring_index++;
+			if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
+				ha->req_ring_index = 0;
+				ha->request_ring_ptr =
+					ha->request_ring;
+			} else
+					ha->request_ring_ptr++;
+
+			pkt = (cmd_a64_entry_t *)ha->request_ring_ptr;
+
+			/* Zero out packet. */
+			memset(pkt, 0, REQUEST_ENTRY_SIZE);
+
+			/* Load packet defaults. */
+			((struct cont_a64_entry *) pkt)->entry_type =
+				CONTINUE_A64_TYPE;
+			((struct cont_a64_entry *) pkt)->entry_count = 1;
+			((struct cont_a64_entry *) pkt)->sys_define =
+				(uint8_t)ha->req_ring_index;
+			/* Setup packet address segment pointer. */
+			dword_ptr =
+				(u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;
+
+			/* Load continuation entry data segments. */
+			for_each_sg(sg, s, remseg, cnt) {
+				if (cnt == 5)
 					break;
 				dma_handle = sg_dma_address(s);
 #if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
-				if (ha->flags.use_pci_vchannel)
-					sn_pci_set_vchan(ha->pdev,
-							(unsigned long *)&dma_handle,
-							 SCSI_BUS_32(cmd));
+			if (ha->flags.use_pci_vchannel)
+				sn_pci_set_vchan(ha->pdev,
+						(unsigned long *)&dma_handle,
+						 SCSI_BUS_32(cmd));
 #endif
 				*dword_ptr++ =
 					cpu_to_le32(pci_dma_lo32(dma_handle));
 				*dword_ptr++ =
 					cpu_to_le32(pci_dma_hi32(dma_handle));
-				*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
-				dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
+				*dword_ptr++ =
+					cpu_to_le32(sg_dma_len(s));
+				dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
 					cpu_to_le32(pci_dma_hi32(dma_handle)),
 					cpu_to_le32(pci_dma_lo32(dma_handle)),
-					cpu_to_le32(sg_dma_len(sg_next(s))));
-				remseg--;
+					cpu_to_le32(sg_dma_len(s)));
 			}
-			dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
-				"command packet data - b %i, t %i, l %i \n",
-				SCSI_BUS_32(cmd), SCSI_TCN_32(cmd),
-				SCSI_LUN_32(cmd));
+			remseg -= cnt;
+			dprintk(5, "qla1280_64bit_start_scsi: "
+				"continuation packet data - b %i, t "
+				"%i, l %i \n", SCSI_BUS_32(cmd),
+				SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
 			qla1280_dump_buffer(5, (char *)pkt,
 					    REQUEST_ENTRY_SIZE);
-
-			/*
-			 * Build continuation packets.
-			 */
-			dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
-				"remains\n", seg_cnt);
-
-			while (remseg > 0) {
-				/* Update sg start */
-				sg = s;
-				/* Adjust ring index. */
-				ha->req_ring_index++;
-				if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
-					ha->req_ring_index = 0;
-					ha->request_ring_ptr =
-						ha->request_ring;
-				} else
-						ha->request_ring_ptr++;
-
-				pkt = (cmd_a64_entry_t *)ha->request_ring_ptr;
-
-				/* Zero out packet. */
-				memset(pkt, 0, REQUEST_ENTRY_SIZE);
-
-				/* Load packet defaults. */
-				((struct cont_a64_entry *) pkt)->entry_type =
-					CONTINUE_A64_TYPE;
-				((struct cont_a64_entry *) pkt)->entry_count = 1;
-				((struct cont_a64_entry *) pkt)->sys_define =
-					(uint8_t)ha->req_ring_index;
-				/* Setup packet address segment pointer. */
-				dword_ptr =
-					(u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;
-
-				/* Load continuation entry data segments. */
-				for_each_sg(sg, s, remseg, cnt) {
-					if (cnt == 5)
-						break;
-					dma_handle = sg_dma_address(s);
-#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
-				if (ha->flags.use_pci_vchannel)
-					sn_pci_set_vchan(ha->pdev, 
-							(unsigned long *)&dma_handle,
-							 SCSI_BUS_32(cmd));
-#endif
-					*dword_ptr++ =
-						cpu_to_le32(pci_dma_lo32(dma_handle));
-					*dword_ptr++ =
-						cpu_to_le32(pci_dma_hi32(dma_handle));
-					*dword_ptr++ =
-						cpu_to_le32(sg_dma_len(s));
-					dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
-						cpu_to_le32(pci_dma_hi32(dma_handle)),
-						cpu_to_le32(pci_dma_lo32(dma_handle)),
-						cpu_to_le32(sg_dma_len(s)));
-				}
-				remseg -= cnt;
-				dprintk(5, "qla1280_64bit_start_scsi: "
-					"continuation packet data - b %i, t "
-					"%i, l %i \n", SCSI_BUS_32(cmd),
-					SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
-				qla1280_dump_buffer(5, (char *)pkt,
-						    REQUEST_ENTRY_SIZE);
-			}
 		}
 	} else {	/* No data transfer */
 		dprintk(5, "qla1280_64bit_start_scsi: No data, command "
@@ -3150,78 +3148,76 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
 		/* Setup packet address segment pointer. */
 		dword_ptr = &pkt->dseg_0_address;
 
-		{	/* FIXME:Indentation in next patch */
-			dprintk(3, "Building S/G data segments..\n");
-			qla1280_dump_buffer(1, (char *)sg, 4 * 16);
+		dprintk(3, "Building S/G data segments..\n");
+		qla1280_dump_buffer(1, (char *)sg, 4 * 16);
 
-			/* Load command entry data segments. */
-			for_each_sg(sg, s, seg_cnt, cnt) {
-				if (cnt == 4)
+		/* Load command entry data segments. */
+		for_each_sg(sg, s, seg_cnt, cnt) {
+			if (cnt == 4)
+				break;
+			*dword_ptr++ =
+				cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
+			*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
+			dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
+				(pci_dma_lo32(sg_dma_address(s))),
+				(sg_dma_len(s)));
+			remseg--;
+		}
+		/*
+		 * Build continuation packets.
+		 */
+		dprintk(3, "S/G Building Continuation"
+			"...seg_cnt=0x%x remains\n", seg_cnt);
+		while (remseg > 0) {
+			/* Continue from end point */
+			sg = s;
+			/* Adjust ring index. */
+			ha->req_ring_index++;
+			if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
+				ha->req_ring_index = 0;
+				ha->request_ring_ptr =
+					ha->request_ring;
+			} else
+				ha->request_ring_ptr++;
+
+			pkt = (struct cmd_entry *)ha->request_ring_ptr;
+
+			/* Zero out packet. */
+			memset(pkt, 0, REQUEST_ENTRY_SIZE);
+
+			/* Load packet defaults. */
+			((struct cont_entry *) pkt)->
+				entry_type = CONTINUE_TYPE;
+			((struct cont_entry *) pkt)->entry_count = 1;
+
+			((struct cont_entry *) pkt)->sys_define =
+				(uint8_t) ha->req_ring_index;
+
+			/* Setup packet address segment pointer. */
+			dword_ptr =
+				&((struct cont_entry *) pkt)->dseg_0_address;
+
+			/* Load continuation entry data segments. */
+			for_each_sg(sg, s, remseg, cnt) {
+				if (cnt == 7)
 					break;
 				*dword_ptr++ =
 					cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
-				*dword_ptr++ = cpu_to_le32(sg_dma_len(s));
-				dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
-					(pci_dma_lo32(sg_dma_address(s))),
-					(sg_dma_len(s)));
-				remseg--;
-			}
-			/*
-			 * Build continuation packets.
-			 */
-			dprintk(3, "S/G Building Continuation"
-				"...seg_cnt=0x%x remains\n", seg_cnt);
-			while (remseg > 0) {
-				/* Continue from end point */
-				sg = s;
-				/* Adjust ring index. */
-				ha->req_ring_index++;
-				if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
-					ha->req_ring_index = 0;
-					ha->request_ring_ptr =
-						ha->request_ring;
-				} else
-					ha->request_ring_ptr++;
-
-				pkt = (struct cmd_entry *)ha->request_ring_ptr;
-
-				/* Zero out packet. */
-				memset(pkt, 0, REQUEST_ENTRY_SIZE);
-
-				/* Load packet defaults. */
-				((struct cont_entry *) pkt)->
-					entry_type = CONTINUE_TYPE;
-				((struct cont_entry *) pkt)->entry_count = 1;
-
-				((struct cont_entry *) pkt)->sys_define =
-					(uint8_t) ha->req_ring_index;
-
-				/* Setup packet address segment pointer. */
-				dword_ptr =
-					&((struct cont_entry *) pkt)->dseg_0_address;
-
-				/* Load continuation entry data segments. */
-				for_each_sg(sg, s, remseg, cnt) {
-					if (cnt == 7)
-						break;
-					*dword_ptr++ =
-						cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
-					*dword_ptr++ =
-						cpu_to_le32(sg_dma_len(s));
-					dprintk(1,
-						"S/G Segment Cont. phys_addr=0x%x, "
-						"len=0x%x\n",
-						cpu_to_le32(pci_dma_lo32(sg_dma_address(s))),
-						cpu_to_le32(sg_dma_len(s)));
-				}
-				remseg -= cnt;
-				dprintk(5, "qla1280_32bit_start_scsi: "
-					"continuation packet data - "
-					"scsi(%i:%i:%i)\n", SCSI_BUS_32(cmd),
-					SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
-				qla1280_dump_buffer(5, (char *)pkt,
-						    REQUEST_ENTRY_SIZE);
+				*dword_ptr++ =
+					cpu_to_le32(sg_dma_len(s));
+				dprintk(1,
+					"S/G Segment Cont. phys_addr=0x%x, "
+					"len=0x%x\n",
+					cpu_to_le32(pci_dma_lo32(sg_dma_address(s))),
+					cpu_to_le32(sg_dma_len(s)));
 			}
+			remseg -= cnt;
+			dprintk(5, "qla1280_32bit_start_scsi: "
+				"continuation packet data - "
+				"scsi(%i:%i:%i)\n", SCSI_BUS_32(cmd),
+				SCSI_TCN_32(cmd), SCSI_LUN_32(cmd));
+			qla1280_dump_buffer(5, (char *)pkt,
+					    REQUEST_ENTRY_SIZE);
 		}
 	} else {	/* No data transfer at all */
 		dprintk(5, "qla1280_32bit_start_scsi: No data, command "
-- 
1.5.3.1

Re: [PATCH 13/32] aha1542.c: convert to accessors and !use_sg cleanup

[Randy Dunlap]

On Wed, 17 Oct 2007 19:53:11 +0200 Boaz Harrosh wrote:

> 
>  - convert to accessors and !use_sg cleanup
> 
> Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
> ---

Tested-by: Randy Dunlap <randy.dunlap@oracle.com> // aha152x_cs

>  drivers/scsi/aha1542.c |   46 ++++++++++------------------------------------
>  1 files changed, 10 insertions(+), 36 deletions(-)


---
~Randy

Re: [PATCH 13/32] aha1542.c: convert to accessors and !use_sg cleanup

[Randy Dunlap]

On Fri, 9 Nov 2007 18:30:48 -0800 Randy Dunlap wrote:

> On Wed, 17 Oct 2007 19:53:11 +0200 Boaz Harrosh wrote:
> 
> > 
> >  - convert to accessors and !use_sg cleanup
> > 
> > Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
> > ---
> 
> Tested-by: Randy Dunlap <randy.dunlap@oracle.com> // aha152x_cs

Negative.  Different driver.  Sorry about that.


> >  drivers/scsi/aha1542.c |   46 ++++++++++------------------------------------
> >  1 files changed, 10 insertions(+), 36 deletions(-)


---
~Randy