vfio-pci: Use cached MSI/MSI-X capabilities

We now cache the MSI/MSI-X capability offsets in the struct pci_dev,
so no need to find the capabilities again.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 10626e8..05afe88 100644 (file)
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -70,7 +70,7 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
                pci_write_config_word(pdev, PCI_COMMAND, cmd);
        }
 
-       msix_pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
+       msix_pos = pdev->msix_cap;
        if (msix_pos) {
                u16 flags;
                u32 table;
@@ -183,7 +183,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
                u8 pos;
                u16 flags;
 
-               pos = pci_find_capability(vdev->pdev, PCI_CAP_ID_MSI);
+               pos = vdev->pdev->msi_cap;
                if (pos) {
                        pci_read_config_word(vdev->pdev,
                                             pos + PCI_MSI_FLAGS, &flags);
@@ -194,7 +194,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
                u8 pos;
                u16 flags;
 
-               pos = pci_find_capability(vdev->pdev, PCI_CAP_ID_MSIX);
+               pos = vdev->pdev->msix_cap;
                if (pos) {
                        pci_read_config_word(vdev->pdev,
                                             pos + PCI_MSIX_FLAGS, &flags);