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>

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;