[PATCH 6/6] scsi: hisi_sas: Set max optimal DMA size for v3 hw

John Garry
2021-03-19T13:31:16Z

For IOMMU strict mode, more than doubles throughput in some scenarios.

Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 4580e081e489..2f77b418bbeb 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -4684,6 +4684,8 @@ hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto err_out_regions;
}

+ dma_set_max_opt_size(dev, PAGE_SIZE * HISI_SAS_SGE_PAGE_CNT);
+
shost = hisi_sas_shost_alloc_pci(pdev);
if (!shost) {
rc = -ENOMEM;
--
2.26.2