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| author | Michael S. Tsirkin <mst@redhat.com> | 2013-08-04 15:43:40 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-04 15:43:40 +0800 |
| commit | 8ff3d73133cb5a8a3514cc184152c553637e74a8 (patch) | |
| tree | 999ec2b6ee2bd5ccf151623b541395a94976b419 /include | |
| parent | 0b7b1cfac3b60be07d6b2ae8fe4db495de5883a6 (diff) | |
| download | kernel_samsung_smdk4412-8ff3d73133cb5a8a3514cc184152c553637e74a8.zip kernel_samsung_smdk4412-8ff3d73133cb5a8a3514cc184152c553637e74a8.tar.gz kernel_samsung_smdk4412-8ff3d73133cb5a8a3514cc184152c553637e74a8.tar.bz2 | |
virtio: support unlocked queue poll
commit cc229884d3f77ec3b1240e467e0236c3e0647c0c upstream.
This adds a way to check ring empty state after enable_cb outside any
locks. Will be used by virtio_net.
Note: there's room for more optimization: caller is likely to have a
memory barrier already, which means we might be able to get rid of a
barrier here. Deferring this optimization until we do some
benchmarking.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[wg: Backported to 3.2]
Signed-off-by: Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/virtio.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 7108857..a39e962 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -93,6 +93,10 @@ void virtqueue_disable_cb(struct virtqueue *vq); bool virtqueue_enable_cb(struct virtqueue *vq); +unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq); + +bool virtqueue_poll(struct virtqueue *vq, unsigned); + bool virtqueue_enable_cb_delayed(struct virtqueue *vq); void *virtqueue_detach_unused_buf(struct virtqueue *vq); |