virtio_pci: remove struct virtio_pci_vq_info
We don't really need struct virtio_pci_vq_info, as most field in there are redundant: - the vq backpointer is not strictly neede to start with - the entry in the vqs list is not needed - the generic virtqueue already has list, we only need to check if it has a callback to get the same semantics - we can use a simple array to look up the MSI-X vec if needed. - That simple array now also duoble serves to replace the per_vq_vectors flag Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Christoph Hellwig
Michael S. Tsirkin
Родитель
e3b56cdd43
Коммит
5c34d002dc
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@ -62,16 +62,13 @@ static irqreturn_t vp_config_changed(int irq, void *opaque)
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static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
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{
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struct virtio_pci_device *vp_dev = opaque;
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struct virtio_pci_vq_info *info;
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irqreturn_t ret = IRQ_NONE;
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unsigned long flags;
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struct virtqueue *vq;
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_for_each_entry(info, &vp_dev->virtqueues, node) {
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if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
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list_for_each_entry(vq, &vp_dev->vdev.vqs, list) {
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if (vq->callback && vring_interrupt(irq, vq) == IRQ_HANDLED)
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ret = IRQ_HANDLED;
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}
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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return ret;
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}
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@ -167,55 +164,6 @@ error:
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return err;
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}
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static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
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void (*callback)(struct virtqueue *vq),
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const char *name,
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u16 msix_vec)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL);
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struct virtqueue *vq;
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unsigned long flags;
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/* fill out our structure that represents an active queue */
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if (!info)
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return ERR_PTR(-ENOMEM);
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vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, msix_vec);
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if (IS_ERR(vq))
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goto out_info;
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info->vq = vq;
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if (callback) {
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_add(&info->node, &vp_dev->virtqueues);
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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} else {
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INIT_LIST_HEAD(&info->node);
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}
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vp_dev->vqs[index] = info;
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return vq;
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out_info:
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kfree(info);
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return vq;
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}
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static void vp_del_vq(struct virtqueue *vq)
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{
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
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unsigned long flags;
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spin_lock_irqsave(&vp_dev->lock, flags);
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list_del(&info->node);
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spin_unlock_irqrestore(&vp_dev->lock, flags);
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vp_dev->del_vq(info);
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kfree(info);
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}
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/* the config->del_vqs() implementation */
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void vp_del_vqs(struct virtio_device *vdev)
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{
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@ -224,16 +172,15 @@ void vp_del_vqs(struct virtio_device *vdev)
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int i;
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list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
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if (vp_dev->per_vq_vectors) {
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int v = vp_dev->vqs[vq->index]->msix_vector;
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if (vp_dev->msix_vector_map) {
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int v = vp_dev->msix_vector_map[vq->index];
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if (v != VIRTIO_MSI_NO_VECTOR)
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free_irq(pci_irq_vector(vp_dev->pci_dev, v),
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vq);
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}
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vp_del_vq(vq);
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vp_dev->del_vq(vq);
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}
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vp_dev->per_vq_vectors = false;
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if (vp_dev->intx_enabled) {
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free_irq(vp_dev->pci_dev->irq, vp_dev);
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@ -261,8 +208,8 @@ void vp_del_vqs(struct virtio_device *vdev)
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vp_dev->msix_names = NULL;
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kfree(vp_dev->msix_affinity_masks);
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vp_dev->msix_affinity_masks = NULL;
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kfree(vp_dev->vqs);
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vp_dev->vqs = NULL;
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kfree(vp_dev->msix_vector_map);
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vp_dev->msix_vector_map = NULL;
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}
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static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
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@ -275,10 +222,6 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
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u16 msix_vec;
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int i, err, nvectors, allocated_vectors;
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vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
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if (!vp_dev->vqs)
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return -ENOMEM;
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if (per_vq_vectors) {
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/* Best option: one for change interrupt, one per vq. */
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nvectors = 1;
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@ -294,7 +237,13 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
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if (err)
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goto error_find;
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vp_dev->per_vq_vectors = per_vq_vectors;
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if (per_vq_vectors) {
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vp_dev->msix_vector_map = kmalloc_array(nvqs,
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sizeof(*vp_dev->msix_vector_map), GFP_KERNEL);
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if (!vp_dev->msix_vector_map)
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goto error_find;
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}
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allocated_vectors = vp_dev->msix_used_vectors;
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for (i = 0; i < nvqs; ++i) {
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if (!names[i]) {
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@ -304,19 +253,25 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
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if (!callbacks[i])
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msix_vec = VIRTIO_MSI_NO_VECTOR;
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else if (vp_dev->per_vq_vectors)
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else if (per_vq_vectors)
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msix_vec = allocated_vectors++;
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else
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msix_vec = VP_MSIX_VQ_VECTOR;
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vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
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vqs[i] = vp_dev->setup_vq(vp_dev, i, callbacks[i], names[i],
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msix_vec);
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if (IS_ERR(vqs[i])) {
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err = PTR_ERR(vqs[i]);
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goto error_find;
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}
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if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
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if (!per_vq_vectors)
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continue;
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if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
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vp_dev->msix_vector_map[i] = VIRTIO_MSI_NO_VECTOR;
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continue;
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}
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/* allocate per-vq irq if available and necessary */
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snprintf(vp_dev->msix_names[msix_vec],
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sizeof *vp_dev->msix_names,
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@ -326,8 +281,12 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
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vring_interrupt, 0,
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vp_dev->msix_names[msix_vec],
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vqs[i]);
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if (err)
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if (err) {
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/* don't free this irq on error */
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vp_dev->msix_vector_map[i] = VIRTIO_MSI_NO_VECTOR;
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goto error_find;
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}
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vp_dev->msix_vector_map[i] = msix_vec;
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}
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return 0;
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@ -343,23 +302,18 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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int i, err;
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vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
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if (!vp_dev->vqs)
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return -ENOMEM;
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err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED,
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dev_name(&vdev->dev), vp_dev);
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if (err)
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goto out_del_vqs;
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vp_dev->intx_enabled = 1;
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vp_dev->per_vq_vectors = false;
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for (i = 0; i < nvqs; ++i) {
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if (!names[i]) {
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vqs[i] = NULL;
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continue;
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}
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vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
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vqs[i] = vp_dev->setup_vq(vp_dev, i, callbacks[i], names[i],
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VIRTIO_MSI_NO_VECTOR);
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if (IS_ERR(vqs[i])) {
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err = PTR_ERR(vqs[i]);
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@ -409,16 +363,15 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
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{
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struct virtio_device *vdev = vq->vdev;
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struct virtio_pci_device *vp_dev = to_vp_device(vdev);
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struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
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struct cpumask *mask;
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unsigned int irq;
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if (!vq->callback)
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return -EINVAL;
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if (vp_dev->msix_enabled) {
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mask = vp_dev->msix_affinity_masks[info->msix_vector];
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irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
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int vec = vp_dev->msix_vector_map[vq->index];
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struct cpumask *mask = vp_dev->msix_affinity_masks[vec];
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unsigned int irq = pci_irq_vector(vp_dev->pci_dev, vec);
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if (cpu == -1)
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irq_set_affinity_hint(irq, NULL);
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else {
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@ -498,8 +451,6 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
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vp_dev->vdev.dev.parent = &pci_dev->dev;
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vp_dev->vdev.dev.release = virtio_pci_release_dev;
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vp_dev->pci_dev = pci_dev;
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INIT_LIST_HEAD(&vp_dev->virtqueues);
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spin_lock_init(&vp_dev->lock);
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/* enable the device */
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rc = pci_enable_device(pci_dev);
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@ -31,17 +31,6 @@
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#include <linux/highmem.h>
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#include <linux/spinlock.h>
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struct virtio_pci_vq_info {
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/* the actual virtqueue */
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struct virtqueue *vq;
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/* the list node for the virtqueues list */
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struct list_head node;
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/* MSI-X vector (or none) */
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unsigned msix_vector;
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};
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/* Our device structure */
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struct virtio_pci_device {
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struct virtio_device vdev;
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@ -75,13 +64,6 @@ struct virtio_pci_device {
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/* the IO mapping for the PCI config space */
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void __iomem *ioaddr;
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/* a list of queues so we can dispatch IRQs */
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spinlock_t lock;
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struct list_head virtqueues;
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/* array of all queues for house-keeping */
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struct virtio_pci_vq_info **vqs;
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/* MSI-X support */
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int msix_enabled;
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int intx_enabled;
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@ -94,16 +76,15 @@ struct virtio_pci_device {
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/* Vectors allocated, excluding per-vq vectors if any */
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unsigned msix_used_vectors;
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/* Whether we have vector per vq */
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bool per_vq_vectors;
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/* Map of per-VQ MSI-X vectors, may be NULL */
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unsigned *msix_vector_map;
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struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
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struct virtio_pci_vq_info *info,
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unsigned idx,
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void (*callback)(struct virtqueue *vq),
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const char *name,
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u16 msix_vec);
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void (*del_vq)(struct virtio_pci_vq_info *info);
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void (*del_vq)(struct virtqueue *vq);
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u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
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};
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@ -112,7 +112,6 @@ static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
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}
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static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
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struct virtio_pci_vq_info *info,
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unsigned index,
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void (*callback)(struct virtqueue *vq),
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const char *name,
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@ -130,8 +129,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
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if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
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return ERR_PTR(-ENOENT);
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info->msix_vector = msix_vec;
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/* create the vring */
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vq = vring_create_virtqueue(index, num,
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VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
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@ -162,9 +159,8 @@ out_deactivate:
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return ERR_PTR(err);
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}
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static void del_vq(struct virtio_pci_vq_info *info)
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static void del_vq(struct virtqueue *vq)
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{
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struct virtqueue *vq = info->vq;
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
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@ -293,7 +293,6 @@ static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
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}
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static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
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struct virtio_pci_vq_info *info,
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unsigned index,
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void (*callback)(struct virtqueue *vq),
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const char *name,
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@ -323,8 +322,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
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/* get offset of notification word for this vq */
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off = vp_ioread16(&cfg->queue_notify_off);
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info->msix_vector = msix_vec;
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/* create the vring */
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vq = vring_create_virtqueue(index, num,
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SMP_CACHE_BYTES, &vp_dev->vdev,
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@ -409,9 +406,8 @@ static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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return 0;
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}
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static void del_vq(struct virtio_pci_vq_info *info)
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static void del_vq(struct virtqueue *vq)
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{
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struct virtqueue *vq = info->vq;
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struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
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vp_iowrite16(vq->index, &vp_dev->common->queue_select);
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