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Subject[PATCH 1/1] Fix ARI enabling for a NVME devices
Date
From: Andrei Leonchikov <andreil499@gmail.com>

Signed-off-by: Andrei Leonchikov <andreil499@gmail.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
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