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| author |   John Garry <john.garry@huawei.com> | 2022-06-23 20:41:59 +0800 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2022-06-27 22:43:57 -0400 |
| commit | fce54ed027577517df1e74b7d54dc2b1bd536887 (patch) | |
| tree | 28c076de3f2e2d53019c72ed51f2a54994bd0e4c /drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | |
| parent | scsi: ibmvfc: Store vhost pointer during subcrq allocation (diff) | |
| download | linux-dev-fce54ed027577517df1e74b7d54dc2b1bd536887.tar.xz linux-dev-fce54ed027577517df1e74b7d54dc2b1bd536887.zip | |
scsi: hisi_sas: Limit max hw sectors for v3 HW
If the controller is behind an IOMMU then the IOMMU IOVA caching range can
affect performance, as discussed in [0].
Limit the max HW sectors to not exceed this limit. We need to hardcode the
value until a proper DMA mapping API is available.
[0] https://lore.kernel.org/linux-iommu/20210129092120.1482-1-thunder.leizhen@huawei.com/
Link: https://lore.kernel.org/r/1655988119-223714-1-git-send-email-john.garry@huawei.com
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/hisi_sas/hisi_sas_v3_hw.c')
| -rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index 7d819fc0395e..eb86afb21aab 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -2782,6 +2782,7 @@ static int slave_configure_v3_hw(struct scsi_device *sdev) struct hisi_hba *hisi_hba = shost_priv(shost); struct device *dev = hisi_hba->dev; int ret = sas_slave_configure(sdev); + unsigned int max_sectors; if (ret) return ret; @@ -2799,6 +2800,12 @@ static int slave_configure_v3_hw(struct scsi_device *sdev) } } + /* Set according to IOMMU IOVA caching limit */ + max_sectors = min_t(size_t, queue_max_hw_sectors(sdev->request_queue), + (PAGE_SIZE * 32) >> SECTOR_SHIFT); + + blk_queue_max_hw_sectors(sdev->request_queue, max_sectors); + return 0; } |