diff options
Diffstat (limited to 'drivers/pci/ats.c')
| -rw-r--r-- | drivers/pci/ats.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 0d06177252c7..b0f68c0ea91e 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -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; |