PCI: Enable ARI if dev and upstream bridge support it; disable otherwise

Currently, we enable ARI in a device's upstream bridge if the bridge and
the device support it.  But we never disable ARI, even if the device is
removed and replaced with a device that doesn't support ARI.

This means that if we hot-remove an ARI device and replace it with a
non-ARI multi-function device, we find only function 0 of the new device
because the upstream bridge still has ARI enabled, and next_ari_fn()
only returns function 0 for the new non-ARI device.

This patch disables ARI in the upstream bridge if the device doesn't
support ARI.  See the PCIe spec, r3.0, sec 6.13.

[bhelgaas: changelog, function comment]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 5cb5820fae40147a29c79913cd1ebadcbfba1348..8b47f70b7d8fbe9b453f958eccb94c94075e7f24 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2069,6 +2069,9 @@ void pci_free_cap_save_buffers(struct pci_dev *dev)
 /**
  * pci_enable_ari - enable ARI forwarding if hardware support it
  * @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)
 {
@@ -2078,9 +2081,6 @@ 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;
@@ -2089,8 +2089,15 @@ 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;
+       }
 }
 
 /**