linux-kernel - [PATCH 1/1] Fix ARI enabling for a NVME devices

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Date:   Tue,  3 Sep 2019 12:53:15 +0000
From:   Andrei Leonvikov <andreil499@...il.com>
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrei Leonchikov <andreil499@...il.com>
Subject: [PATCH 1/1] Fix ARI enabling for a NVME devices

From: Andrei Leonchikov <andreil499@...il.com>

Signed-off-by: Andrei Leonchikov <andreil499@...il.com>
---
 drivers/pci/pci.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1b27b5af3..ed5f0888c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3149,9 +3149,12 @@ void pci_configure_ari(struct pci_dev *dev)
 	if (!bridge)
 		return;
 
-	pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap);
-	if (!(cap & PCI_EXP_DEVCAP2_ARI))
-		return;
+	if ((dev->driver != NULL) && (strncmp(dev->driver->name, "nvme", 4) == 0)) {
+		// for NVME device this field always zero, but ARI can be enabled
+		pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap);
+		if (!(cap & PCI_EXP_DEVCAP2_ARI))
+			return;
+	}
 
 	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) {
 		pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2,
-- 
2.21.0