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virtio: provide a method to get the IRQ affinity mask for a virtqueue 

This basically passed up the pci_irq_get_affinity information through
virtio through an optional get_vq_affinity method.  It is only implemented
by the PCI backend for now, and only when we use per-virtqueue IRQs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Christoph Hellwig 2017-02-05 18:15:23 +01:00 committed by Michael S. Tsirkin
parent fb5e31d970
commit bbaba47956
5 changed files with 19 additions and 0 deletions
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11
drivers/virtio/virtio_pci_common.c
View File

@ -361,6 +361,17 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
return 0;
}
const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
unsigned int *map = vp_dev->msix_vector_map;
if (!map || map[index] == VIRTIO_MSI_NO_VECTOR)
return NULL;
return pci_irq_get_affinity(vp_dev->pci_dev, map[index]);
}
#ifdef CONFIG_PM_SLEEP
static int virtio_pci_freeze(struct device *dev)
{

2
drivers/virtio/virtio_pci_common.h
View File

@ -108,6 +108,8 @@ const char *vp_bus_name(struct virtio_device *vdev);
*/
int vp_set_vq_affinity(struct virtqueue *vq, int cpu);
const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index);
#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
int virtio_pci_legacy_probe(struct virtio_pci_device *);
void virtio_pci_legacy_remove(struct virtio_pci_device *);

1
drivers/virtio/virtio_pci_legacy.c
View File

@ -190,6 +190,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
.get_vq_affinity = vp_get_vq_affinity,
};
/* the PCI probing function */

2
drivers/virtio/virtio_pci_modern.c
View File

@ -437,6 +437,7 @@ static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
.get_vq_affinity = vp_get_vq_affinity,
};
static const struct virtio_config_ops virtio_pci_config_ops = {
@ -452,6 +453,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
.get_vq_affinity = vp_get_vq_affinity,
};
/**

3
include/linux/virtio_config.h
View File

@ -58,6 +58,7 @@ struct irq_affinity;
* This returns a pointer to the bus name a la pci_name from which
* the caller can then copy.
* @set_vq_affinity: set the affinity for a virtqueue.
* @get_vq_affinity: get the affinity for a virtqueue (optional).
*/
typedef void vq_callback_t(struct virtqueue *);
struct virtio_config_ops {
@ -77,6 +78,8 @@ struct virtio_config_ops {
int (*finalize_features)(struct virtio_device *vdev);
const char *(*bus_name)(struct virtio_device *vdev);
int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
int index);
};
/* If driver didn't advertise the feature, it will never appear. */