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

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Message-ID: <1616160348-29451-7-git-send-email-john.garry@huawei.com>
Date:   Fri, 19 Mar 2021 21:25:48 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <hch@....de>,
        <m.szyprowski@...sung.com>, <robin.murphy@....com>
CC:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>, <linuxarm@...wei.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH 6/6] scsi: hisi_sas: Set max optimal DMA size for v3 hw

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

Signed-off-by: John Garry <john.garry@...wei.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