On Thu, Oct 24, 2024 at 12:10:26AM +0000, Igor Pylypiv wrote:
> Increasing the per-request size maximum (max_sectors_kb) to 4096 KiB
> 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).
>
> This change increases 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@xxxxxxxxxx>
> ---
> drivers/scsi/pm8001/pm8001_defs.h | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/pm8001/pm8001_defs.h b/drivers/scsi/pm8001/pm8001_defs.h
> index 501b574239e8..f6e6fe3f4cd6 100644
> --- a/drivers/scsi/pm8001/pm8001_defs.h
> +++ b/drivers/scsi/pm8001/pm8001_defs.h
> @@ -92,8 +92,7 @@ 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_MAX_DMA_SG 1024
Just realized that I forgot to include setting .max_sectors to 8192
in pm8001_sht. I'll fix that in v2.
Thanks,
Igor
>
> enum memory_region_num {
> AAP1 = 0x0, /* application acceleration processor */
> --
> 2.47.0.105.g07ac214952-goog
>
