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virtio_pci: use pci_alloc_irq_vectors 

This avoids the separate allocation for the msix_entries structures, and
instead allows us to use pci_irq_vector to find a given IRQ vector.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Christoph Hellwig 2016-11-17 11:43:13 +01:00 committed by Michael S. Tsirkin
parent d41795978c
commit fa3a327935
2 changed files with 17 additions and 26 deletions
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42
drivers/virtio/virtio_pci_common.c
View File

@ -37,7 +37,7 @@ void vp_synchronize_vectors(struct virtio_device *vdev)
synchronize_irq(vp_dev->pci_dev->irq);
for (i = 0; i < vp_dev->msix_vectors; ++i)
synchronize_irq(vp_dev->msix_entries[i].vector);
synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i));
}
/* the notify function used when creating a virt queue */
@ -113,7 +113,7 @@ static void vp_free_vectors(struct virtio_device *vdev)
}
for (i = 0; i < vp_dev->msix_used_vectors; ++i)
free_irq(vp_dev->msix_entries[i].vector, vp_dev);
free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev);
for (i = 0; i < vp_dev->msix_vectors; i++)
if (vp_dev->msix_affinity_masks[i])
@ -123,7 +123,7 @@ static void vp_free_vectors(struct virtio_device *vdev)
/* Disable the vector used for configuration */
vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
pci_disable_msix(vp_dev->pci_dev);
pci_free_irq_vectors(vp_dev->pci_dev);
vp_dev->msix_enabled = 0;
}
@ -131,8 +131,6 @@ static void vp_free_vectors(struct virtio_device *vdev)
vp_dev->msix_used_vectors = 0;
kfree(vp_dev->msix_names);
vp_dev->msix_names = NULL;
kfree(vp_dev->msix_entries);
vp_dev->msix_entries = NULL;
kfree(vp_dev->msix_affinity_masks);
vp_dev->msix_affinity_masks = NULL;
}
@ -147,10 +145,6 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
vp_dev->msix_vectors = nvectors;
vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
GFP_KERNEL);
if (!vp_dev->msix_entries)
goto error;
vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
GFP_KERNEL);
if (!vp_dev->msix_names)
@ -165,12 +159,9 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
GFP_KERNEL))
goto error;
for (i = 0; i < nvectors; ++i)
vp_dev->msix_entries[i].entry = i;
err = pci_enable_msix_exact(vp_dev->pci_dev,
vp_dev->msix_entries, nvectors);
if (err)
err = pci_alloc_irq_vectors(vp_dev->pci_dev, nvectors, nvectors,
PCI_IRQ_MSIX);
if (err < 0)
goto error;
vp_dev->msix_enabled = 1;
@ -178,7 +169,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-config", name);
err = request_irq(vp_dev->msix_entries[v].vector,
err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
vp_config_changed, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
@ -197,7 +188,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-virtqueues", name);
err = request_irq(vp_dev->msix_entries[v].vector,
err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
vp_vring_interrupt, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
@ -276,14 +267,15 @@ void vp_del_vqs(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtqueue *vq, *n;
struct virtio_pci_vq_info *info;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
info = vp_dev->vqs[vq->index];
if (vp_dev->per_vq_vectors &&
info->msix_vector != VIRTIO_MSI_NO_VECTOR)
free_irq(vp_dev->msix_entries[info->msix_vector].vector,
vq);
if (vp_dev->per_vq_vectors) {
int v = vp_dev->vqs[vq->index]->msix_vector;
if (v != VIRTIO_MSI_NO_VECTOR)
free_irq(pci_irq_vector(vp_dev->pci_dev, v),
vq);
}
vp_del_vq(vq);
}
vp_dev->per_vq_vectors = false;
@ -356,7 +348,7 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
sizeof *vp_dev->msix_names,
"%s-%s",
dev_name(&vp_dev->vdev.dev), names[i]);
err = request_irq(vp_dev->msix_entries[msix_vec].vector,
err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
vring_interrupt, 0,
vp_dev->msix_names[msix_vec],
vqs[i]);
@ -417,7 +409,7 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
if (vp_dev->msix_enabled) {
mask = vp_dev->msix_affinity_masks[info->msix_vector];
irq = vp_dev->msix_entries[info->msix_vector].vector;
irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
if (cpu == -1)
irq_set_affinity_hint(irq, NULL);
else {

1
drivers/virtio/virtio_pci_common.h
View File

@ -85,7 +85,6 @@ struct virtio_pci_device {
/* MSI-X support */
int msix_enabled;
int intx_enabled;
struct msix_entry *msix_entries;
cpumask_var_t *msix_affinity_masks;
/* Name strings for interrupts. This size should be enough,
* and I'm too lazy to allocate each name separately. */