From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
Per PCIe r5.0, sec 9.3.7.14, if a PF implements the PASID Capability,
the PF PASID configuration is shared by its VFs. VFs must not implement
their own PASID Capability. But, commit 751035b8dc06 ("PCI/ATS: Cache
PASID Capability offset") when adding support for PASID Capability
offset caching, modified the pci_max_pasids() and pci_pasid_features()
APIs to use PASID Capability offset of VF device instead of using
PASID Capability offset of associated PF device. This change leads to
IOMMU bind failures when pci_max_pasids() and pci_pasid_features()
functions are invoked by PCIe VF devices.
So modify pci_max_pasids() and pci_pasid_features() functions to use
correct PASID Capability offset.
Fixes: 751035b8dc06 ("PCI/ATS: Cache PASID Capability offset")
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
drivers/pci/ats.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index 982b46f0a54d..b6f064c885c3 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -424,11 +424,12 @@ void pci_restore_pasid_state(struct pci_dev *pdev)
int pci_pasid_features(struct pci_dev *pdev)
{
u16 supported;
- int pasid = pdev->pasid_cap;
+ int pasid;
if (pdev->is_virtfn)
pdev = pci_physfn(pdev);
+ pasid = pdev->pasid_cap;
if (!pasid)
return -EINVAL;
@@ -451,11 +452,12 @@ int pci_pasid_features(struct pci_dev *pdev)
int pci_max_pasids(struct pci_dev *pdev)
{
u16 supported;
- int pasid = pdev->pasid_cap;
+ int pasid;
if (pdev->is_virtfn)
pdev = pci_physfn(pdev);
+ pasid = pdev->pasid_cap;
if (!pasid)
return -EINVAL;
--
2.21.0
