linux-kernel - [PATCH v2 15/15] scsi: hisi_sas: Set max optimal DMA size for v3 hw

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Date:   Mon, 10 May 2021 22:17:29 +0800
From:   John Garry <john.garry@...wei.com>
To:     <joro@...tes.org>, <will@...nel.org>, <robin.murphy@....com>,
        <hch@....de>, <m.szyprowski@...sung.com>
CC:     <iommu@...ts.linux-foundation.org>, <baolu.lu@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <linuxarm@...wei.com>, <sai.praneeth.prakhya@...el.com>,
        John Garry <john.garry@...wei.com>
Subject: [PATCH v2 15/15] scsi: hisi_sas: Set max optimal DMA size for v3 hw

For IOMMU strict mode, gives a big performance boost in some scenarios.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 499c770d405c..365fc9de4be2 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -4675,6 +4675,11 @@ hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	struct sas_ha_struct *sha;
 	int rc, phy_nr, port_nr, i;
 
+	rc = dma_set_max_opt_size(dev, PAGE_SIZE * HISI_SAS_SGE_PAGE_CNT);
+	/* We can live with other errors */
+	if (rc == -EPROBE_DEFER)
+		return rc;
+
 	rc = pci_enable_device(pdev);
 	if (rc)
 		goto err_out;
-- 
2.26.2