[PATCH 01/12] pm80xx : Increase request sg length.

[Deepak Ukey <deepak.ukey@microchip.com>]

From: Peter Chang <dpf@google.com>

Increasing the per-request size maximum (max_sectors_kb) runs into
the per-device dma scatter gather list limit (max_segments) for
users of the io vector system calls (eg, readv and writev). This is
because the kernel combines io vectors into dma segments when
possible, but it doesn't work for our user because the vectors in the
buffer cache get scrambled.
This change bumps the advertised max scatter gather length to 528 to
cover 2M w/ x86's 4k pages and some extra for the user checksum.
It trims the size of some of the tables we don't care about and
exposes all of the command slots upstream to the scsi layer.

Signed-off-by: Peter Chang <dpf@google.com>
Signed-off-by: Deepak Ukey <deepak.ukey@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
Signed-off-by: Vishakha Channapattan <vishakhavc@google.com>
Signed-off-by: Bhavesh Jashnani <bjashnani@google.com>
Signed-off-by: Radha Ramachandran <radha@google.com>
Signed-off-by: Akshat Jain <akshatzen@google.com>
Signed-off-by: Yu Zheng <yuuzheng@google.com>
---
 drivers/scsi/Kconfig              | 7 +++++++
 drivers/scsi/pm8001/pm8001_defs.h | 5 +++--
 drivers/scsi/pm8001/pm8001_init.c | 2 +-
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 90cf4691b8c3..da2073a67b24 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1504,6 +1504,13 @@ config SCSI_PM8001
 	  This driver supports PMC-Sierra PCIE SAS/SATA 8x6G SPC 8001 chip
 	  based host adapters.
 
+config SCSI_PM8001_MAX_DMA_SG
+	int "max segments per request"
+	depends on SCSI_PM8001
+	default 128
+	help
+	  Allow for larger requests bound by MAX_ORDER of the ccb table.
+
 config SCSI_BFA_FC
 	tristate "Brocade BFA Fibre Channel Support"
 	depends on PCI && SCSI
diff --git a/drivers/scsi/pm8001/pm8001_defs.h b/drivers/scsi/pm8001/pm8001_defs.h
index 48e0624ecc68..1c7f15fd69ce 100644
--- a/drivers/scsi/pm8001/pm8001_defs.h
+++ b/drivers/scsi/pm8001/pm8001_defs.h
@@ -75,7 +75,7 @@ enum port_type {
 };
 
 /* driver compile-time configuration */
-#define	PM8001_MAX_CCB		 512	/* max ccbs supported */
+#define	PM8001_MAX_CCB		 256	/* max ccbs supported */
 #define PM8001_MPI_QUEUE         1024   /* maximum mpi queue entries */
 #define	PM8001_MAX_INB_NUM	 1
 #define	PM8001_MAX_OUTB_NUM	 1
@@ -99,7 +99,8 @@ enum port_type {
 #define OB			(CI + PM8001_MAX_SPCV_INB_NUM)
 #define PI			(OB + PM8001_MAX_SPCV_OUTB_NUM)
 #define USI_MAX_MEMCNT		(PI + PM8001_MAX_SPCV_OUTB_NUM)
-#define PM8001_MAX_DMA_SG	SG_ALL
+#define	CONFIG_SCSI_PM8001_MAX_DMA_SG	528
+#define PM8001_MAX_DMA_SG	CONFIG_SCSI_PM8001_MAX_DMA_SG
 enum memory_region_num {
 	AAP1 = 0x0, /* application acceleration processor */
 	IOP,	    /* IO processor */
diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index ff618ad80ebd..3f1e755c52c6 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -95,7 +95,7 @@ static struct scsi_host_template pm8001_sht = {
 	.bios_param		= sas_bios_param,
 	.can_queue		= 1,
 	.this_id		= -1,
-	.sg_tablesize		= SG_ALL,
+	.sg_tablesize		= PM8001_MAX_DMA_SG,
 	.max_sectors		= SCSI_DEFAULT_MAX_SECTORS,
 	.eh_device_reset_handler = sas_eh_device_reset_handler,
 	.eh_target_reset_handler = sas_eh_target_reset_handler,
-- 
2.16.3