[PATCH v7 42/46] virtio_scsi: v1.0 support

Michael S. Tsirkin
2014-11-30T15:13:16Z

Note: for consistency, and to avoid sparse errors,
convert all fields, even those no longer in use
for virtio v1.0.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
---
include/linux/virtio_scsi.h | 32 +++++++++++++++-------------
drivers/scsi/virtio_scsi.c | 51 ++++++++++++++++++++++++++++-----------------
2 files changed, 49 insertions(+), 34 deletions(-)

diff --git a/include/linux/virtio_scsi.h b/include/linux/virtio_scsi.h
index de429d1..af44864 100644
--- a/include/linux/virtio_scsi.h
+++ b/include/linux/virtio_scsi.h
@@ -27,13 +27,15 @@
#ifndef _LINUX_VIRTIO_SCSI_H
#define _LINUX_VIRTIO_SCSI_H

+#include <linux/virtio_types.h>
+
#define VIRTIO_SCSI_CDB_SIZE 32
#define VIRTIO_SCSI_SENSE_SIZE 96

/* SCSI command request, followed by data-out */
struct virtio_scsi_cmd_req {
u8 lun[8]; /* Logical Unit Number */
- u64 tag; /* Command identifier */
+ __virtio64 tag; /* Command identifier */
u8 task_attr; /* Task attribute */
u8 prio; /* SAM command priority field */
u8 crn;
@@ -43,20 +45,20 @@ struct virtio_scsi_cmd_req {
/* SCSI command request, followed by protection information */
struct virtio_scsi_cmd_req_pi {
u8 lun[8]; /* Logical Unit Number */
- u64 tag; /* Command identifier */
+ __virtio64 tag; /* Command identifier */
u8 task_attr; /* Task attribute */
u8 prio; /* SAM command priority field */
u8 crn;
- u32 pi_bytesout; /* DataOUT PI Number of bytes */
- u32 pi_bytesin; /* DataIN PI Number of bytes */
+ __virtio32 pi_bytesout; /* DataOUT PI Number of bytes */
+ __virtio32 pi_bytesin; /* DataIN PI Number of bytes */
u8 cdb[VIRTIO_SCSI_CDB_SIZE];
} __packed;

/* Response, followed by sense data and data-in */
struct virtio_scsi_cmd_resp {
- u32 sense_len; /* Sense data length */
- u32 resid; /* Residual bytes in data buffer */
- u16 status_qualifier; /* Status qualifier */
+ __virtio32 sense_len; /* Sense data length */
+ __virtio32 resid; /* Residual bytes in data buffer */
+ __virtio16 status_qualifier; /* Status qualifier */
u8 status; /* Command completion status */
u8 response; /* Response values */
u8 sense[VIRTIO_SCSI_SENSE_SIZE];
@@ -64,10 +66,10 @@ struct virtio_scsi_cmd_resp {

/* Task Management Request */
struct virtio_scsi_ctrl_tmf_req {
- u32 type;
- u32 subtype;
+ __virtio32 type;
+ __virtio32 subtype;
u8 lun[8];
- u64 tag;
+ __virtio64 tag;
} __packed;

struct virtio_scsi_ctrl_tmf_resp {
@@ -76,20 +78,20 @@ struct virtio_scsi_ctrl_tmf_resp {

/* Asynchronous notification query/subscription */
struct virtio_scsi_ctrl_an_req {
- u32 type;
+ __virtio32 type;
u8 lun[8];
- u32 event_requested;
+ __virtio32 event_requested;
} __packed;

struct virtio_scsi_ctrl_an_resp {
- u32 event_actual;
+ __virtio32 event_actual;
u8 response;
} __packed;

struct virtio_scsi_event {
- u32 event;
+ __virtio32 event;
u8 lun[8];
- u32 reason;
+ __virtio32 reason;
} __packed;

struct virtio_scsi_config {
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index b83846f..d9ec806 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -158,7 +158,7 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
sc, resp->response, resp->status, resp->sense_len);

sc->result = resp->status;
- virtscsi_compute_resid(sc, resp->resid);
+ virtscsi_compute_resid(sc, virtio32_to_cpu(vscsi->vdev, resp->resid));
switch (resp->response) {
case VIRTIO_SCSI_S_OK:
set_host_byte(sc, DID_OK);
@@ -196,10 +196,13 @@ static void virtscsi_complete_cmd(struct virtio_scsi *vscsi, void *buf)
break;
}

- WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE);
+ WARN_ON(virtio32_to_cpu(vscsi->vdev, resp->sense_len) >
+ VIRTIO_SCSI_SENSE_SIZE);
if (sc->sense_buffer) {
memcpy(sc->sense_buffer, resp->sense,
- min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE));
+ min_t(u32,
+ virtio32_to_cpu(vscsi->vdev, resp->sense_len),
+ VIRTIO_SCSI_SENSE_SIZE));
if (resp->sense_len)
set_driver_byte(sc, DRIVER_SENSE);
}
@@ -323,7 +326,7 @@ static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
unsigned int target = event->lun[1];
unsigned int lun = (event->lun[2] << 8) | event->lun[3];

- switch (event->reason) {
+ switch (virtio32_to_cpu(vscsi->vdev, event->reason)) {
case VIRTIO_SCSI_EVT_RESET_RESCAN:
scsi_add_device(shost, 0, target, lun);
break;
@@ -349,8 +352,8 @@ static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
unsigned int target = event->lun[1];
unsigned int lun = (event->lun[2] << 8) | event->lun[3];
- u8 asc = event->reason & 255;
- u8 ascq = event->reason >> 8;
+ u8 asc = virtio32_to_cpu(vscsi->vdev, event->reason) & 255;
+ u8 ascq = virtio32_to_cpu(vscsi->vdev, event->reason) >> 8;

sdev = scsi_device_lookup(shost, 0, target, lun);
if (!sdev) {
@@ -374,12 +377,14 @@ static void virtscsi_handle_event(struct work_struct *work)
struct virtio_scsi *vscsi = event_node->vscsi;
struct virtio_scsi_event *event = &event_node->event;

- if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) {
- event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED;
+ if (event->event &
+ cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) {
+ event->event &= ~cpu_to_virtio32(vscsi->vdev,
+ VIRTIO_SCSI_T_EVENTS_MISSED);
scsi_scan_host(virtio_scsi_host(vscsi->vdev));
}

- switch (event->event) {
+ switch (virtio32_to_cpu(vscsi->vdev, event->event)) {
case VIRTIO_SCSI_T_NO_EVENT:
break;
case VIRTIO_SCSI_T_TRANSPORT_RESET:
@@ -482,26 +487,28 @@ static int virtscsi_kick_cmd(struct virtio_scsi_vq *vq,
return err;
}

-static void virtio_scsi_init_hdr(struct virtio_scsi_cmd_req *cmd,
+static void virtio_scsi_init_hdr(struct virtio_device *vdev,
+ struct virtio_scsi_cmd_req *cmd,
struct scsi_cmnd *sc)
{
cmd->lun[0] = 1;
cmd->lun[1] = sc->device->id;
cmd->lun[2] = (sc->device->lun >> 8) | 0x40;
cmd->lun[3] = sc->device->lun & 0xff;
- cmd->tag = (unsigned long)sc;
+ cmd->tag = cpu_to_virtio64(vdev, (unsigned long)sc);
cmd->task_attr = VIRTIO_SCSI_S_SIMPLE;
cmd->prio = 0;
cmd->crn = 0;
}

-static void virtio_scsi_init_hdr_pi(struct virtio_scsi_cmd_req_pi *cmd_pi,
+static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev,
+ struct virtio_scsi_cmd_req_pi *cmd_pi,
struct scsi_cmnd *sc)
{
struct request *rq = sc->request;
struct blk_integrity *bi;

- virtio_scsi_init_hdr((struct virtio_scsi_cmd_req *)cmd_pi, sc);
+ virtio_scsi_init_hdr(vdev, (struct virtio_scsi_cmd_req *)cmd_pi, sc);

if (!rq || !scsi_prot_sg_count(sc))
return;
@@ -509,9 +516,13 @@ static void virtio_scsi_init_hdr_pi(struct virtio_scsi_cmd_req_pi *cmd_pi,
bi = blk_get_integrity(rq->rq_disk);

if (sc->sc_data_direction == DMA_TO_DEVICE)
- cmd_pi->pi_bytesout = blk_rq_sectors(rq) * bi->tuple_size;
+ cmd_pi->pi_bytesout = cpu_to_virtio32(vdev,
+ blk_rq_sectors(rq) *
+ bi->tuple_size);
else if (sc->sc_data_direction == DMA_FROM_DEVICE)
- cmd_pi->pi_bytesin = blk_rq_sectors(rq) * bi->tuple_size;
+ cmd_pi->pi_bytesin = cpu_to_virtio32(vdev,
+ blk_rq_sectors(rq) *
+ bi->tuple_size);
}

static int virtscsi_queuecommand(struct virtio_scsi *vscsi,
@@ -536,11 +547,11 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi,
BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);

if (virtio_has_feature(vscsi->vdev, VIRTIO_SCSI_F_T10_PI)) {
- virtio_scsi_init_hdr_pi(&cmd->req.cmd_pi, sc);
+ virtio_scsi_init_hdr_pi(vscsi->vdev, &cmd->req.cmd_pi, sc);
memcpy(cmd->req.cmd_pi.cdb, sc->cmnd, sc->cmd_len);
req_size = sizeof(cmd->req.cmd_pi);
} else {
- virtio_scsi_init_hdr(&cmd->req.cmd, sc);
+ virtio_scsi_init_hdr(vscsi->vdev, &cmd->req.cmd, sc);
memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
req_size = sizeof(cmd->req.cmd);
}
@@ -655,7 +666,8 @@ static int virtscsi_device_reset(struct scsi_cmnd *sc)
cmd->sc = sc;
cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
.type = VIRTIO_SCSI_T_TMF,
- .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET,
+ .subtype = cpu_to_virtio32(vscsi->vdev,
+ VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET),
.lun[0] = 1,
.lun[1] = sc->device->id,
.lun[2] = (sc->device->lun >> 8) | 0x40,
@@ -713,7 +725,7 @@ static int virtscsi_abort(struct scsi_cmnd *sc)
.lun[1] = sc->device->id,
.lun[2] = (sc->device->lun >> 8) | 0x40,
.lun[3] = sc->device->lun & 0xff,
- .tag = (unsigned long)sc,
+ .tag = cpu_to_virtio64(vscsi->vdev, (unsigned long)sc),
};
return virtscsi_tmf(vscsi, cmd);
}
@@ -1073,6 +1085,7 @@ static unsigned int features[] = {
VIRTIO_SCSI_F_HOTPLUG,
VIRTIO_SCSI_F_CHANGE,
VIRTIO_SCSI_F_T10_PI,
+ VIRTIO_F_VERSION_1,
};

static struct virtio_driver virtio_scsi_driver = {
--
MST