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-rw-r--r--drivers/virtio/virtio_pci_common.c32
1 files changed, 15 insertions, 17 deletions
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index df548a6fb844..4608fd9aaa6c 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -143,13 +143,13 @@ void vp_del_vqs(struct virtio_device *vdev)
static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[], vq_callback_t *callbacks[],
- const char * const names[], struct irq_affinity *desc)
+ const char * const names[], bool per_vq_vectors,
+ struct irq_affinity *desc)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
const char *name = dev_name(&vp_dev->vdev.dev);
int i, err = -ENOMEM, allocated_vectors, nvectors;
unsigned flags = PCI_IRQ_MSIX;
- bool shared = false;
u16 msix_vec;
if (desc) {
@@ -162,16 +162,12 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
if (callbacks[i])
nvectors++;
- /* Try one vector per queue first. */
- err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors,
- nvectors, flags, desc);
- if (err < 0) {
- /* Fallback to one vector for config, one shared for queues. */
- shared = true;
+ if (per_vq_vectors) {
+ err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors,
+ nvectors, flags, desc);
+ } else {
err = pci_alloc_irq_vectors(vp_dev->pci_dev, 2, 2,
PCI_IRQ_MSIX);
- if (err < 0)
- return err;
}
if (err < 0)
return err;
@@ -199,7 +195,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
err = request_irq(pci_irq_vector(vp_dev->pci_dev, 0), vp_config_changed,
0, vp_dev->msix_names[0], vp_dev);
if (err)
- goto out_free_msix_affinity_masks;
+ goto out_free_irq_vectors;
/* Verify we had enough resources to assign the vector */
if (vp_dev->config_vector(vp_dev, 0) == VIRTIO_MSI_NO_VECTOR) {
@@ -249,11 +245,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
}
vp_dev->msix_vector_map[i] = msix_vec;
- /*
- * Use a different vector for each queue if they are available,
- * else share the same vector for all VQs.
- */
- if (!shared)
+ if (per_vq_vectors)
allocated_vectors++;
}
@@ -319,9 +311,15 @@ int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
{
int err;
- err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, desc);
+ /* Try MSI-X with one vector per queue. */
+ err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, desc);
+ if (!err)
+ return 0;
+ /* Fallback: MSI-X with one vector for config, one shared for queues. */
+ err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, desc);
if (!err)
return 0;
+ /* Finally fall back to regular interrupts. */
return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names);
}