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PCI/ATS: Handle sharing of PF PASID Capability with all VFs

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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.  Since VFs don't have a PASID Capability,
pci_enable_pasid() always failed, which caused IOMMU setup to fail.

Update the PASID interfaces so for VFs they reflect the state of the PF
PASID.

[bhelgaas: rebase without pasid_cap caching, commit log]
Suggested-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lore.kernel.org/r/8ba1ac192e4ac737508b6ac15002158e176bab91.1567029860.git.sathyanarayanan.kuppuswamy@linux.intel.com
Link: https://lore.kernel.org/r/20190905193146.90250-3-helgaas@kernel.org
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
This commit is contained in:
Kuppuswamy Sathyanarayanan 2019-09-05 14:31:43 -05:00 committed by Bjorn Helgaas
parent 9bf49e36d7
commit 2b0ae7cc3b
1 changed files with 23 additions and 0 deletions
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23
drivers/pci/ats.c
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@ -346,6 +346,16 @@ int pci_enable_pasid(struct pci_dev *pdev, int features)
u16 control, supported;
int pos;
/*
* VFs must not implement the PASID Capability, but if a PF
* supports PASID, its VFs share the PF PASID configuration.
*/
if (pdev->is_virtfn) {
if (pci_physfn(pdev)->pasid_enabled)
return 0;
return -EINVAL;
}
if (WARN_ON(pdev->pasid_enabled))
return -EBUSY;
@ -383,6 +393,10 @@ void pci_disable_pasid(struct pci_dev *pdev)
u16 control = 0;
int pos;
/* VFs share the PF PASID configuration */
if (pdev->is_virtfn)
return;
if (WARN_ON(!pdev->pasid_enabled))
return;
@ -405,6 +419,9 @@ void pci_restore_pasid_state(struct pci_dev *pdev)
u16 control;
int pos;
if (pdev->is_virtfn)
return;
if (!pdev->pasid_enabled)
return;
@ -432,6 +449,9 @@ int pci_pasid_features(struct pci_dev *pdev)
u16 supported;
int pos;
if (pdev->is_virtfn)
pdev = pci_physfn(pdev);
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
if (!pos)
return -EINVAL;
@ -458,6 +478,9 @@ int pci_max_pasids(struct pci_dev *pdev)
u16 supported;
int pos;
if (pdev->is_virtfn)
pdev = pci_physfn(pdev);
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
if (!pos)
return -EINVAL;