PCI: vmd: Reserve IRQ pre-vector for better affinity

The driver has a special purpose for the VMD device's first IRQ, so this
one shouldn't be considered for IRQ affinity.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/host/vmd.c b/drivers/pci/host/vmd.c
index 6088c30..539da10 100644 (file)
--- a/drivers/pci/host/vmd.c
+++ b/drivers/pci/host/vmd.c
@@ -671,6 +671,14 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
        struct vmd_dev *vmd;
        int i, err;
 
+       /*
+        * The first vector is reserved for special use, so start affinity at
+        * the second vector
+        */
+       struct irq_affinity affd = {
+               .pre_vectors = 1,
+       };
+
        if (resource_size(&dev->resource[VMD_CFGBAR]) < (1 << 20))
                return -ENOMEM;
 
@@ -696,8 +704,8 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
        if (vmd->msix_count < 0)
                return -ENODEV;
 
-       vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count,
-                                       PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
+       vmd->msix_count = pci_alloc_irq_vectors_affinity(dev, 1, vmd->msix_count,
+                                       PCI_IRQ_MSIX | PCI_IRQ_AFFINITY, &affd);
        if (vmd->msix_count < 0)
                return vmd->msix_count;