[PATCH v5 3/8] virtio: hookup irq_get_affinity callback

Daniel Wagner
2024-11-15T16:38:06Z

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

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Daniel Wagner <wagi@kernel.org>
---
drivers/virtio/virtio.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index b9095751e43bb7db5fc991b0cc0979d2e86f7b9b..4ca6ec84cb092eac7ddf4b86b4eacac099b480cf 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -377,6 +377,24 @@ static void virtio_dev_remove(struct device *_d)
of_node_put(dev->dev.of_node);
}

+/**
+ * virtio_irq_get_affinity - get IRQ affinity mask for device
+ * @_d: ptr to dev structure
+ * @irq_vec: interrupt vector number
+ *
+ * Return the CPU affinity mask for @_d and @irq_vec.
+ */
+static const struct cpumask *virtio_irq_get_affinity(struct device *_d,
+ unsigned int irq_vec)
+{
+ struct virtio_device *dev = dev_to_virtio(_d);
+
+ if (!dev->config->get_vq_affinity)
+ return NULL;
+
+ return dev->config->get_vq_affinity(dev, irq_vec);
+}
+
static const struct bus_type virtio_bus = {
.name = "virtio",
.match = virtio_dev_match,
@@ -384,6 +402,7 @@ static const struct bus_type virtio_bus = {
.uevent = virtio_uevent,
.probe = virtio_dev_probe,
.remove = virtio_dev_remove,
+ .irq_get_affinity = virtio_irq_get_affinity,
};

int __register_virtio_driver(struct virtio_driver *driver, struct module *owner)

--
2.47.0