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virtio_pci: free up vq->priv 

We don't need to go from vq to vq info on
data path, so using direct vq->priv pointer for that
seems like a waste.

Let's build an array of vq infos, then we can use vq->index
for that lookup.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2014-12-03 17:50:50 +02:00
parent f913dd4536
commit 3ec7a77bb3
1 changed files with 31 additions and 25 deletions
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56
drivers/virtio/virtio_pci.c
View File

@ -31,6 +31,23 @@ MODULE_DESCRIPTION("virtio-pci");
MODULE_LICENSE("GPL");
MODULE_VERSION("1");
struct virtio_pci_vq_info {
/* the actual virtqueue */
struct virtqueue *vq;
/* the number of entries in the queue */
int num;
/* the virtual address of the ring queue */
void *queue;
/* the list node for the virtqueues list */
struct list_head node;
/* MSI-X vector (or none) */
unsigned msix_vector;
};
/* Our device structure */
struct virtio_pci_device {
struct virtio_device vdev;
@ -46,6 +63,9 @@ struct virtio_pci_device {
spinlock_t lock;
struct list_head virtqueues;
/* array of all queues for house-keeping */
struct virtio_pci_vq_info **vqs;
/* MSI-X support */
int msix_enabled;
int intx_enabled;
@ -71,23 +91,6 @@ enum {
VP_MSIX_VQ_VECTOR = 1,
};
struct virtio_pci_vq_info {
/* the actual virtqueue */
struct virtqueue *vq;
/* the number of entries in the queue */
int num;
/* the virtual address of the ring queue */
void *queue;
/* the list node for the virtqueues list */
struct list_head node;
/* MSI-X vector (or none) */
unsigned msix_vector;
};
/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
static const struct pci_device_id virtio_pci_id_table[] = {
{ PCI_DEVICE(0x1af4, PCI_ANY_ID) },
@ -434,7 +437,6 @@ static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
goto out_activate_queue;
}
vq->priv = info;
info->vq = vq;
if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
@ -454,6 +456,7 @@ static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
INIT_LIST_HEAD(&info->node);
}
vp_dev->vqs[index] = info;
return vq;
out_assign:
@ -469,7 +472,7 @@ static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
static void vp_del_vq(struct virtqueue *vq)
{
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
struct virtio_pci_vq_info *info = vq->priv;
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
unsigned long flags, size;
spin_lock_irqsave(&vp_dev->lock, flags);
@ -503,7 +506,7 @@ static void vp_del_vqs(struct virtio_device *vdev)
struct virtio_pci_vq_info *info;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
info = vq->priv;
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,
@ -513,6 +516,7 @@ static void vp_del_vqs(struct virtio_device *vdev)
vp_dev->per_vq_vectors = false;
vp_free_vectors(vdev);
kfree(vp_dev->vqs);
}
static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
@ -526,11 +530,15 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
u16 msix_vec;
int i, err, nvectors, allocated_vectors;
vp_dev->vqs = kmalloc(nvqs * sizeof *vp_dev->vqs, GFP_KERNEL);
if (!vp_dev->vqs)
return -ENOMEM;
if (!use_msix) {
/* Old style: one normal interrupt for change and all vqs. */
err = vp_request_intx(vdev);
if (err)
goto error_request;
goto error_find;
} else {
if (per_vq_vectors) {
/* Best option: one for change interrupt, one per vq. */
@ -545,7 +553,7 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
if (err)
goto error_request;
goto error_find;
}
vp_dev->per_vq_vectors = per_vq_vectors;
@ -587,8 +595,6 @@ static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
error_find:
vp_del_vqs(vdev);
error_request:
return err;
}
@ -630,7 +636,7 @@ static int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
{
struct virtio_device *vdev = vq->vdev;
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info = vq->priv;
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
struct cpumask *mask;
unsigned int irq;