diff options
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_pci_common.c | 32 |
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); } |