diff options
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 89dc8ac096b..177a50ff645 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2042,10 +2042,13 @@ void pci_free_cap_save_buffers(struct pci_dev *dev) } /** - * pci_enable_ari - enable ARI forwarding if hardware support it + * pci_configure_ari - enable or disable ARI forwarding * @dev: the PCI device + * + * If @dev and its upstream bridge both support ARI, enable ARI in the + * bridge. Otherwise, disable ARI in the bridge. */ -void pci_enable_ari(struct pci_dev *dev) +void pci_configure_ari(struct pci_dev *dev) { u32 cap; struct pci_dev *bridge; @@ -2053,9 +2056,6 @@ void pci_enable_ari(struct pci_dev *dev) if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn) return; - if (!pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) - return; - bridge = dev->bus->self; if (!bridge) return; @@ -2064,8 +2064,15 @@ void pci_enable_ari(struct pci_dev *dev) if (!(cap & PCI_EXP_DEVCAP2_ARI)) return; - pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2, PCI_EXP_DEVCTL2_ARI); - bridge->ari_enabled = 1; + if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) { + pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2, + PCI_EXP_DEVCTL2_ARI); + bridge->ari_enabled = 1; + } else { + pcie_capability_clear_word(bridge, PCI_EXP_DEVCTL2, + PCI_EXP_DEVCTL2_ARI); + bridge->ari_enabled = 0; + } } /** |