PCI: hookup irq_get_affinity callback

struct bus_type has a new callback for retrieving the IRQ affinity for a
device. Hook this callback up for PCI based devices.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
Link: https://lore.kernel.org/r/20241202-refactor-blk-affinity-helpers-v6-2-27211e9c2cd5@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/pci/pci-driver.c

@@ -1670,13 +1670,27 @@ static void pci_dma_cleanup(struct device *dev)
 		iommu_device_unuse_default_domain(dev);
 }
 
+/*
+ * pci_device_irq_get_affinity - get IRQ affinity mask for device
+ * @dev: ptr to dev structure
+ * @irq_vec: interrupt vector number
+ *
+ * Return the CPU affinity mask for @dev and @irq_vec.
+ */
+static const struct cpumask *pci_device_irq_get_affinity(struct device *dev,
+					unsigned int irq_vec)
+{
+	return pci_irq_get_affinity(to_pci_dev(dev), irq_vec);
+}
+
 const struct bus_type pci_bus_type = {
 	.name		= "pci",
 	.match		= pci_bus_match,
 	.uevent		= pci_uevent,
 	.probe		= pci_device_probe,
 	.remove		= pci_device_remove,
 	.shutdown	= pci_device_shutdown,
+	.irq_get_affinity = pci_device_irq_get_affinity,
 	.dev_groups	= pci_dev_groups,
 	.bus_groups	= pci_bus_groups,
 	.drv_groups	= pci_drv_groups,