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

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Per PCIe r5.0, sec 9.3.7.11, VFs must not implement the PRI Capability.  If
the PF implements PRI, it is shared by the VFs.  Since VFs don't have a PRI
Capability, pci_enable_pri() always failed, which caused IOMMU setup to
fail.

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

[bhelgaas: rebase without pri_cap caching, commit log]
Suggested-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lore.kernel.org/r/b971e31f8695980da8e4a7f93e3b6a3edba3edaa.1567029860.git.sathyanarayanan.kuppuswamy@linux.intel.com
Link: https://lore.kernel.org/r/20190905193146.90250-2-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 14:31:42 -05:00 committed by Bjorn Helgaas
parent 8cbb8a9374
commit 9bf49e36d7
1 changed files with 24 additions and 0 deletions
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24
drivers/pci/ats.c
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@ -182,6 +182,17 @@ int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
u32 max_requests;
int pos;
/*
* VFs must not implement the PRI Capability. If their PF
* implements PRI, it is shared by the VFs, so if the PF PRI is
* enabled, it is also enabled for the VF.
*/
if (pdev->is_virtfn) {
if (pci_physfn(pdev)->pri_enabled)
return 0;
return -EINVAL;
}
if (WARN_ON(pdev->pri_enabled))
return -EBUSY;
@ -218,6 +229,10 @@ void pci_disable_pri(struct pci_dev *pdev)
u16 control;
int pos;
/* VFs share the PF PRI */
if (pdev->is_virtfn)
return;
if (WARN_ON(!pdev->pri_enabled))
return;
@ -243,6 +258,9 @@ void pci_restore_pri_state(struct pci_dev *pdev)
u32 reqs = pdev->pri_reqs_alloc;
int pos;
if (pdev->is_virtfn)
return;
if (!pdev->pri_enabled)
return;
@ -267,6 +285,9 @@ int pci_reset_pri(struct pci_dev *pdev)
u16 control;
int pos;
if (pdev->is_virtfn)
return 0;
if (WARN_ON(pdev->pri_enabled))
return -EBUSY;
@ -293,6 +314,9 @@ int pci_prg_resp_pasid_required(struct pci_dev *pdev)
u16 status;
int pos;
if (pdev->is_virtfn)
pdev = pci_physfn(pdev);
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
if (!pos)
return 0;