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

[John Garry <john.garry@xxxxxxxxxx>]

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

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