virtio: find_vqs/del_vqs virtio operations
This replaces find_vq/del_vq with find_vqs/del_vqs virtio operations, and updates all drivers. This is needed for MSI support, because MSI needs to know the total number of vectors upfront. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (+ lguest/9p compile fixes)
This commit is contained in:
parent
9499f5e7ed
commit
d2a7ddda9f
@ -288,7 +288,7 @@ static int virtblk_probe(struct virtio_device *vdev)
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sg_init_table(vblk->sg, vblk->sg_elems);
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/* We expect one virtqueue, for output. */
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vblk->vq = vdev->config->find_vq(vdev, 0, blk_done, "requests");
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vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests");
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if (IS_ERR(vblk->vq)) {
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err = PTR_ERR(vblk->vq);
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goto out_free_vblk;
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@ -388,7 +388,7 @@ out_put_disk:
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out_mempool:
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mempool_destroy(vblk->pool);
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out_free_vq:
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vdev->config->del_vq(vblk->vq);
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vdev->config->del_vqs(vdev);
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out_free_vblk:
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kfree(vblk);
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out:
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@ -409,7 +409,7 @@ static void virtblk_remove(struct virtio_device *vdev)
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blk_cleanup_queue(vblk->disk->queue);
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put_disk(vblk->disk);
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mempool_destroy(vblk->pool);
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vdev->config->del_vq(vblk->vq);
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vdev->config->del_vqs(vdev);
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kfree(vblk);
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}
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@ -94,13 +94,13 @@ static int virtrng_probe(struct virtio_device *vdev)
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int err;
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/* We expect a single virtqueue. */
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vq = vdev->config->find_vq(vdev, 0, random_recv_done, "input");
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vq = virtio_find_single_vq(vdev, random_recv_done, "input");
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if (IS_ERR(vq))
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return PTR_ERR(vq);
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err = hwrng_register(&virtio_hwrng);
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if (err) {
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vdev->config->del_vq(vq);
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vdev->config->del_vqs(vdev);
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return err;
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}
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@ -112,7 +112,7 @@ static void virtrng_remove(struct virtio_device *vdev)
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{
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vdev->config->reset(vdev);
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hwrng_unregister(&virtio_hwrng);
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vdev->config->del_vq(vq);
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vdev->config->del_vqs(vdev);
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}
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static struct virtio_device_id id_table[] = {
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@ -188,6 +188,9 @@ static void hvc_handle_input(struct virtqueue *vq)
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* Finally we put our input buffer in the input queue, ready to receive. */
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static int __devinit virtcons_probe(struct virtio_device *dev)
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{
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vq_callback_t *callbacks[] = { hvc_handle_input, NULL};
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const char *names[] = { "input", "output" };
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struct virtqueue *vqs[2];
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int err;
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vdev = dev;
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@ -199,20 +202,15 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
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goto fail;
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}
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/* Find the input queue. */
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/* Find the queues. */
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/* FIXME: This is why we want to wean off hvc: we do nothing
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* when input comes in. */
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in_vq = vdev->config->find_vq(vdev, 0, hvc_handle_input, "input");
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if (IS_ERR(in_vq)) {
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err = PTR_ERR(in_vq);
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err = vdev->config->find_vqs(vdev, 2, vqs, callbacks, names);
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if (err)
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goto free;
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}
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out_vq = vdev->config->find_vq(vdev, 1, NULL, "output");
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if (IS_ERR(out_vq)) {
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err = PTR_ERR(out_vq);
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goto free_in_vq;
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}
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in_vq = vqs[0];
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out_vq = vqs[1];
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/* Start using the new console output. */
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virtio_cons.get_chars = get_chars;
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@ -233,17 +231,15 @@ static int __devinit virtcons_probe(struct virtio_device *dev)
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hvc = hvc_alloc(0, 0, &virtio_cons, PAGE_SIZE);
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if (IS_ERR(hvc)) {
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err = PTR_ERR(hvc);
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goto free_out_vq;
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goto free_vqs;
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}
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/* Register the input buffer the first time. */
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add_inbuf();
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return 0;
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free_out_vq:
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vdev->config->del_vq(out_vq);
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free_in_vq:
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vdev->config->del_vq(in_vq);
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free_vqs:
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vdev->config->del_vqs(vdev);
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free:
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kfree(inbuf);
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fail:
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@ -313,6 +313,38 @@ static void lg_del_vq(struct virtqueue *vq)
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kfree(lvq);
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}
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static void lg_del_vqs(struct virtio_device *vdev)
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{
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struct virtqueue *vq, *n;
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list_for_each_entry_safe(vq, n, &vdev->vqs, list)
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lg_del_vq(vq);
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}
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static int lg_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[],
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vq_callback_t *callbacks[],
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const char *names[])
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{
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struct lguest_device *ldev = to_lgdev(vdev);
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int i;
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/* We must have this many virtqueues. */
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if (nvqs > ldev->desc->num_vq)
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return -ENOENT;
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for (i = 0; i < nvqs; ++i) {
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vqs[i] = lg_find_vq(vdev, i, callbacks[i], names[i]);
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if (IS_ERR(vqs[i]))
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goto error;
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}
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return 0;
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error:
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lg_del_vqs(vdev);
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return PTR_ERR(vqs[i]);
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}
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/* The ops structure which hooks everything together. */
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static struct virtio_config_ops lguest_config_ops = {
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.get_features = lg_get_features,
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@ -322,8 +354,8 @@ static struct virtio_config_ops lguest_config_ops = {
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.get_status = lg_get_status,
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.set_status = lg_set_status,
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.reset = lg_reset,
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.find_vq = lg_find_vq,
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.del_vq = lg_del_vq,
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.find_vqs = lg_find_vqs,
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.del_vqs = lg_del_vqs,
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};
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/* The root device for the lguest virtio devices. This makes them appear as
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@ -845,6 +845,10 @@ static int virtnet_probe(struct virtio_device *vdev)
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int err;
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struct net_device *dev;
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struct virtnet_info *vi;
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struct virtqueue *vqs[3];
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vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
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const char *names[] = { "input", "output", "control" };
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int nvqs;
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/* Allocate ourselves a network device with room for our info */
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dev = alloc_etherdev(sizeof(struct virtnet_info));
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@ -905,25 +909,19 @@ static int virtnet_probe(struct virtio_device *vdev)
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if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
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vi->mergeable_rx_bufs = true;
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/* We expect two virtqueues, receive then send. */
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vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done, "input");
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if (IS_ERR(vi->rvq)) {
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err = PTR_ERR(vi->rvq);
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goto free;
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}
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/* We expect two virtqueues, receive then send,
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* and optionally control. */
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nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
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vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done, "output");
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if (IS_ERR(vi->svq)) {
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err = PTR_ERR(vi->svq);
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goto free_recv;
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}
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err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
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if (err)
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goto free;
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vi->rvq = vqs[0];
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vi->svq = vqs[1];
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if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
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vi->cvq = vdev->config->find_vq(vdev, 2, NULL, "control");
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if (IS_ERR(vi->cvq)) {
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err = PTR_ERR(vi->svq);
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goto free_send;
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}
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vi->cvq = vqs[2];
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if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
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dev->features |= NETIF_F_HW_VLAN_FILTER;
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@ -941,7 +939,7 @@ static int virtnet_probe(struct virtio_device *vdev)
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err = register_netdev(dev);
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if (err) {
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pr_debug("virtio_net: registering device failed\n");
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goto free_ctrl;
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goto free_vqs;
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}
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/* Last of all, set up some receive buffers. */
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@ -962,13 +960,8 @@ static int virtnet_probe(struct virtio_device *vdev)
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unregister:
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unregister_netdev(dev);
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free_ctrl:
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if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ))
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vdev->config->del_vq(vi->cvq);
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free_send:
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vdev->config->del_vq(vi->svq);
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free_recv:
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vdev->config->del_vq(vi->rvq);
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free_vqs:
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vdev->config->del_vqs(vdev);
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free:
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free_netdev(dev);
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return err;
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@ -994,12 +987,10 @@ static void virtnet_remove(struct virtio_device *vdev)
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BUG_ON(vi->num != 0);
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vdev->config->del_vq(vi->svq);
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vdev->config->del_vq(vi->rvq);
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if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ))
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vdev->config->del_vq(vi->cvq);
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unregister_netdev(vi->dev);
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vdev->config->del_vqs(vi->vdev);
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while (vi->pages)
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__free_pages(get_a_page(vi, GFP_KERNEL), 0);
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@ -227,6 +227,38 @@ static void kvm_del_vq(struct virtqueue *vq)
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KVM_S390_VIRTIO_RING_ALIGN));
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}
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static void kvm_del_vqs(struct virtio_device *vdev)
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{
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struct virtqueue *vq, *n;
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list_for_each_entry_safe(vq, n, &vdev->vqs, list)
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kvm_del_vq(vq);
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}
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static int kvm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[],
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vq_callback_t *callbacks[],
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const char *names[])
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{
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struct kvm_device *kdev = to_kvmdev(vdev);
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int i;
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/* We must have this many virtqueues. */
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if (nvqs > kdev->desc->num_vq)
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return -ENOENT;
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for (i = 0; i < nvqs; ++i) {
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vqs[i] = kvm_find_vq(vdev, i, callbacks[i], names[i]);
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if (IS_ERR(vqs[i]))
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goto error;
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}
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return 0;
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error:
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kvm_del_vqs(vdev);
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return PTR_ERR(vqs[i]);
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}
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/*
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* The config ops structure as defined by virtio config
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*/
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@ -238,8 +270,8 @@ static struct virtio_config_ops kvm_vq_configspace_ops = {
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.get_status = kvm_get_status,
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.set_status = kvm_set_status,
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.reset = kvm_reset,
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.find_vq = kvm_find_vq,
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.del_vq = kvm_del_vq,
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.find_vqs = kvm_find_vqs,
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.del_vqs = kvm_del_vqs,
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};
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/*
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@ -204,6 +204,9 @@ static int balloon(void *_vballoon)
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static int virtballoon_probe(struct virtio_device *vdev)
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{
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struct virtio_balloon *vb;
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struct virtqueue *vqs[2];
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vq_callback_t *callbacks[] = { balloon_ack, balloon_ack };
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const char *names[] = { "inflate", "deflate" };
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int err;
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vdev->priv = vb = kmalloc(sizeof(*vb), GFP_KERNEL);
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@ -218,22 +221,17 @@ static int virtballoon_probe(struct virtio_device *vdev)
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vb->vdev = vdev;
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/* We expect two virtqueues. */
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vb->inflate_vq = vdev->config->find_vq(vdev, 0, balloon_ack, "inflate");
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if (IS_ERR(vb->inflate_vq)) {
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err = PTR_ERR(vb->inflate_vq);
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err = vdev->config->find_vqs(vdev, 2, vqs, callbacks, names);
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if (err)
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goto out_free_vb;
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}
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vb->deflate_vq = vdev->config->find_vq(vdev, 1, balloon_ack, "deflate");
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if (IS_ERR(vb->deflate_vq)) {
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err = PTR_ERR(vb->deflate_vq);
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goto out_del_inflate_vq;
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}
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vb->inflate_vq = vqs[0];
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vb->deflate_vq = vqs[1];
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vb->thread = kthread_run(balloon, vb, "vballoon");
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if (IS_ERR(vb->thread)) {
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err = PTR_ERR(vb->thread);
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goto out_del_deflate_vq;
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goto out_del_vqs;
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}
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vb->tell_host_first
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@ -241,10 +239,8 @@ static int virtballoon_probe(struct virtio_device *vdev)
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return 0;
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out_del_deflate_vq:
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vdev->config->del_vq(vb->deflate_vq);
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out_del_inflate_vq:
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vdev->config->del_vq(vb->inflate_vq);
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out_del_vqs:
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vdev->config->del_vqs(vdev);
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out_free_vb:
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kfree(vb);
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out:
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@ -264,8 +260,7 @@ static void virtballoon_remove(struct virtio_device *vdev)
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/* Now we reset the device so we can clean up the queues. */
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vdev->config->reset(vdev);
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vdev->config->del_vq(vb->deflate_vq);
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vdev->config->del_vq(vb->inflate_vq);
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vdev->config->del_vqs(vdev);
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kfree(vb);
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}
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@ -276,11 +276,7 @@ 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 = vq->priv;
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unsigned long flags, size;
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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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unsigned long size;
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vring_del_virtqueue(vq);
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@ -293,14 +289,41 @@ static void vp_del_vq(struct virtqueue *vq)
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kfree(info);
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}
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static void vp_del_vqs(struct virtio_device *vdev)
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{
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struct virtqueue *vq, *n;
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list_for_each_entry_safe(vq, n, &vdev->vqs, list)
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vp_del_vq(vq);
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}
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static int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
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struct virtqueue *vqs[],
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vq_callback_t *callbacks[],
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const char *names[])
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{
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int i;
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for (i = 0; i < nvqs; ++i) {
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vqs[i] = vp_find_vq(vdev, i, callbacks[i], names[i]);
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if (IS_ERR(vqs[i]))
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goto error;
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}
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return 0;
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error:
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vp_del_vqs(vdev);
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return PTR_ERR(vqs[i]);
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}
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static struct virtio_config_ops virtio_pci_config_ops = {
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.get = vp_get,
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.set = vp_set,
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.get_status = vp_get_status,
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.set_status = vp_set_status,
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.reset = vp_reset,
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.find_vq = vp_find_vq,
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.del_vq = vp_del_vq,
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.find_vqs = vp_find_vqs,
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.del_vqs = vp_del_vqs,
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.get_features = vp_get_features,
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.finalize_features = vp_finalize_features,
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};
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@ -29,6 +29,7 @@
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#define VIRTIO_F_NOTIFY_ON_EMPTY 24
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#ifdef __KERNEL__
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#include <linux/err.h>
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#include <linux/virtio.h>
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/**
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@ -49,16 +50,26 @@
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* @set_status: write the status byte
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* vdev: the virtio_device
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* status: the new status byte
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* @request_vqs: request the specified number of virtqueues
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* vdev: the virtio_device
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* max_vqs: the max number of virtqueues we want
|
||||
* If supplied, must call before any virtqueues are instantiated.
|
||||
* To modify the max number of virtqueues after request_vqs has been
|
||||
* called, call free_vqs and then request_vqs with a new value.
|
||||
* @free_vqs: cleanup resources allocated by request_vqs
|
||||
* vdev: the virtio_device
|
||||
* If supplied, must call after all virtqueues have been deleted.
|
||||
* @reset: reset the device
|
||||
* vdev: the virtio device
|
||||
* After this, status and feature negotiation must be done again
|
||||
* @find_vq: find a virtqueue and instantiate it.
|
||||
* @find_vqs: find virtqueues and instantiate them.
|
||||
* vdev: the virtio_device
|
||||
* index: the 0-based virtqueue number in case there's more than one.
|
||||
* callback: the virtqueue callback
|
||||
* name: the virtqueue name (mainly for debugging)
|
||||
* Returns the new virtqueue or ERR_PTR() (eg. -ENOENT).
|
||||
* @del_vq: free a virtqueue found by find_vq().
|
||||
* nvqs: the number of virtqueues to find
|
||||
* vqs: on success, includes new virtqueues
|
||||
* callbacks: array of callbacks, for each virtqueue
|
||||
* names: array of virtqueue names (mainly for debugging)
|
||||
* Returns 0 on success or error status
|
||||
* @del_vqs: free virtqueues found by find_vqs().
|
||||
* @get_features: get the array of feature bits for this device.
|
||||
* vdev: the virtio_device
|
||||
* Returns the first 32 feature bits (all we currently need).
|
||||
@ -67,6 +78,7 @@
|
||||
* This gives the final feature bits for the device: it can change
|
||||
* the dev->feature bits if it wants.
|
||||
*/
|
||||
typedef void vq_callback_t(struct virtqueue *);
|
||||
struct virtio_config_ops
|
||||
{
|
||||
void (*get)(struct virtio_device *vdev, unsigned offset,
|
||||
@ -76,11 +88,11 @@ struct virtio_config_ops
|
||||
u8 (*get_status)(struct virtio_device *vdev);
|
||||
void (*set_status)(struct virtio_device *vdev, u8 status);
|
||||
void (*reset)(struct virtio_device *vdev);
|
||||
struct virtqueue *(*find_vq)(struct virtio_device *vdev,
|
||||
unsigned index,
|
||||
void (*callback)(struct virtqueue *),
|
||||
const char *name);
|
||||
void (*del_vq)(struct virtqueue *vq);
|
||||
int (*find_vqs)(struct virtio_device *, unsigned nvqs,
|
||||
struct virtqueue *vqs[],
|
||||
vq_callback_t *callbacks[],
|
||||
const char *names[]);
|
||||
void (*del_vqs)(struct virtio_device *);
|
||||
u32 (*get_features)(struct virtio_device *vdev);
|
||||
void (*finalize_features)(struct virtio_device *vdev);
|
||||
};
|
||||
@ -128,5 +140,18 @@ static inline int virtio_config_buf(struct virtio_device *vdev,
|
||||
vdev->config->get(vdev, offset, buf, len);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline
|
||||
struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
|
||||
vq_callback_t *c, const char *n)
|
||||
{
|
||||
vq_callback_t *callbacks[] = { c };
|
||||
const char *names[] = { n };
|
||||
struct virtqueue *vq;
|
||||
int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names);
|
||||
if (err < 0)
|
||||
return ERR_PTR(err);
|
||||
return vq;
|
||||
}
|
||||
#endif /* __KERNEL__ */
|
||||
#endif /* _LINUX_VIRTIO_CONFIG_H */
|
||||
|
@ -246,7 +246,7 @@ static int p9_virtio_probe(struct virtio_device *vdev)
|
||||
chan->vdev = vdev;
|
||||
|
||||
/* We expect one virtqueue, for requests. */
|
||||
chan->vq = vdev->config->find_vq(vdev, 0, req_done, "requests");
|
||||
chan->vq = virtio_find_single_vq(vdev, req_done, "requests");
|
||||
if (IS_ERR(chan->vq)) {
|
||||
err = PTR_ERR(chan->vq);
|
||||
goto out_free_vq;
|
||||
@ -261,7 +261,7 @@ static int p9_virtio_probe(struct virtio_device *vdev)
|
||||
return 0;
|
||||
|
||||
out_free_vq:
|
||||
vdev->config->del_vq(chan->vq);
|
||||
vdev->config->del_vqs(vdev);
|
||||
fail:
|
||||
mutex_lock(&virtio_9p_lock);
|
||||
chan_index--;
|
||||
@ -332,7 +332,7 @@ static void p9_virtio_remove(struct virtio_device *vdev)
|
||||
BUG_ON(chan->inuse);
|
||||
|
||||
if (chan->initialized) {
|
||||
vdev->config->del_vq(chan->vq);
|
||||
vdev->config->del_vqs(vdev);
|
||||
chan->initialized = false;
|
||||
}
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user