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scsi: pm8001: Increase request sg length to support 4MiB requests

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Increasing the per-request size maximum to 4MiB (8192 sectors x 512
bytes) runs into the per-device DMA scatter gather list limit
(max_segments) for users of the io vector system calls (e.g. readv and
writev).

Increase the max scatter gather list length to 1024 to enable kernel to
send 4MiB (1024 * 4KiB page size) requests.

Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Link: https://lore.kernel.org/r/20241025185009.3278297-1-ipylypiv@google.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Igor Pylypiv 2024-10-25 18:50:09 +00:00 committed by Martin K. Petersen
parent 4501ea5f0a
commit 53b550de46
2 changed files with 6 additions and 2 deletions
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7
drivers/scsi/pm8001/pm8001_defs.h
View File

@ -92,8 +92,11 @@ enum port_type {
#define PM8001_MAX_MSIX_VEC 64 /* max msi-x int for spcv/ve */
#define PM8001_RESERVE_SLOT 8
#define CONFIG_SCSI_PM8001_MAX_DMA_SG 528
#define PM8001_MAX_DMA_SG CONFIG_SCSI_PM8001_MAX_DMA_SG
#define PM8001_SECTOR_SIZE 512
#define PM8001_PAGE_SIZE_4K 4096
#define PM8001_MAX_IO_SIZE (4 * 1024 * 1024)
#define PM8001_MAX_DMA_SG (PM8001_MAX_IO_SIZE / PM8001_PAGE_SIZE_4K)
#define PM8001_MAX_SECTORS (PM8001_MAX_IO_SIZE / PM8001_SECTOR_SIZE)
enum memory_region_num {
AAP1 = 0x0, /* application acceleration processor */

1
drivers/scsi/pm8001/pm8001_init.c
View File

@ -121,6 +121,7 @@ static const struct scsi_host_template pm8001_sht = {
.scan_start = pm8001_scan_start,
.can_queue = 1,
.sg_tablesize = PM8001_MAX_DMA_SG,
.max_sectors = PM8001_MAX_SECTORS,
.shost_groups = pm8001_host_groups,
.sdev_groups = pm8001_sdev_groups,
.track_queue_depth = 1,