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* [PATCH] drm/virtio: fix vq wait_event condition
@ 2018-04-03 9:59 Gerd Hoffmann
2018-04-20 7:22 ` Gerd Hoffmann
0 siblings, 1 reply; 3+ messages in thread
From: Gerd Hoffmann @ 2018-04-03 9:59 UTC (permalink / raw)
To: dri-devel
Cc: amagloire, Gerd Hoffmann, stable, David Airlie,
open list:VIRTIO GPU DRIVER, open list
Wait until we have enough space in the virt queue to actually queue up
our request. Avoids the guest spinning in case we have a non-zero
amount of free entries but not enough for the request.
Cc: stable@vger.kernel.org
Reported-by: Alain Magloire <amagloire@blackberry.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
drivers/gpu/drm/virtio/virtgpu_vq.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 48e4f1df6e..020070d483 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -293,7 +293,7 @@ static int virtio_gpu_queue_ctrl_buffer_locked(struct virtio_gpu_device *vgdev,
ret = virtqueue_add_sgs(vq, sgs, outcnt, incnt, vbuf, GFP_ATOMIC);
if (ret == -ENOSPC) {
spin_unlock(&vgdev->ctrlq.qlock);
- wait_event(vgdev->ctrlq.ack_queue, vq->num_free);
+ wait_event(vgdev->ctrlq.ack_queue, vq->num_free >= outcnt + incnt);
spin_lock(&vgdev->ctrlq.qlock);
goto retry;
} else {
@@ -368,7 +368,7 @@ static int virtio_gpu_queue_cursor(struct virtio_gpu_device *vgdev,
ret = virtqueue_add_sgs(vq, sgs, outcnt, 0, vbuf, GFP_ATOMIC);
if (ret == -ENOSPC) {
spin_unlock(&vgdev->cursorq.qlock);
- wait_event(vgdev->cursorq.ack_queue, vq->num_free);
+ wait_event(vgdev->cursorq.ack_queue, vq->num_free >= outcnt);
spin_lock(&vgdev->cursorq.qlock);
goto retry;
} else {
--
2.9.3
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/virtio: fix vq wait_event condition
2018-04-03 9:59 [PATCH] drm/virtio: fix vq wait_event condition Gerd Hoffmann
@ 2018-04-20 7:22 ` Gerd Hoffmann
2018-04-23 1:24 ` Dave Airlie
0 siblings, 1 reply; 3+ messages in thread
From: Gerd Hoffmann @ 2018-04-20 7:22 UTC (permalink / raw)
To: dri-devel
Cc: amagloire, stable, David Airlie, open list:VIRTIO GPU DRIVER, open list
On Tue, Apr 03, 2018 at 11:59:04AM +0200, Gerd Hoffmann wrote:
> Wait until we have enough space in the virt queue to actually queue up
> our request. Avoids the guest spinning in case we have a non-zero
> amount of free entries but not enough for the request.
Ping airlied, can you please either pick it up or review so I can commit
myself?
thanks,
Gerd
> Cc: stable@vger.kernel.org
> Reported-by: Alain Magloire <amagloire@blackberry.com>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
> drivers/gpu/drm/virtio/virtgpu_vq.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index 48e4f1df6e..020070d483 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -293,7 +293,7 @@ static int virtio_gpu_queue_ctrl_buffer_locked(struct virtio_gpu_device *vgdev,
> ret = virtqueue_add_sgs(vq, sgs, outcnt, incnt, vbuf, GFP_ATOMIC);
> if (ret == -ENOSPC) {
> spin_unlock(&vgdev->ctrlq.qlock);
> - wait_event(vgdev->ctrlq.ack_queue, vq->num_free);
> + wait_event(vgdev->ctrlq.ack_queue, vq->num_free >= outcnt + incnt);
> spin_lock(&vgdev->ctrlq.qlock);
> goto retry;
> } else {
> @@ -368,7 +368,7 @@ static int virtio_gpu_queue_cursor(struct virtio_gpu_device *vgdev,
> ret = virtqueue_add_sgs(vq, sgs, outcnt, 0, vbuf, GFP_ATOMIC);
> if (ret == -ENOSPC) {
> spin_unlock(&vgdev->cursorq.qlock);
> - wait_event(vgdev->cursorq.ack_queue, vq->num_free);
> + wait_event(vgdev->cursorq.ack_queue, vq->num_free >= outcnt);
> spin_lock(&vgdev->cursorq.qlock);
> goto retry;
> } else {
> --
> 2.9.3
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/virtio: fix vq wait_event condition
2018-04-20 7:22 ` Gerd Hoffmann
@ 2018-04-23 1:24 ` Dave Airlie
0 siblings, 0 replies; 3+ messages in thread
From: Dave Airlie @ 2018-04-23 1:24 UTC (permalink / raw)
To: Gerd Hoffmann
Cc: dri-devel, David Airlie, open list, amagloire, stable,
open list:VIRTIO GPU DRIVER
On 20 April 2018 at 17:22, Gerd Hoffmann <kraxel@redhat.com> wrote:
> On Tue, Apr 03, 2018 at 11:59:04AM +0200, Gerd Hoffmann wrote:
>> Wait until we have enough space in the virt queue to actually queue up
>> our request. Avoids the guest spinning in case we have a non-zero
>> amount of free entries but not enough for the request.
>
> Ping airlied, can you please either pick it up or review so I can commit
> myself?
Just in case it got lost from my phone,
Reviewed-by: Dave Airlie <airlied@redhat.com>
>
> thanks,
> Gerd
>
>> Cc: stable@vger.kernel.org
>> Reported-by: Alain Magloire <amagloire@blackberry.com>
>> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>> ---
>> drivers/gpu/drm/virtio/virtgpu_vq.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
>> index 48e4f1df6e..020070d483 100644
>> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
>> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
>> @@ -293,7 +293,7 @@ static int virtio_gpu_queue_ctrl_buffer_locked(struct virtio_gpu_device *vgdev,
>> ret = virtqueue_add_sgs(vq, sgs, outcnt, incnt, vbuf, GFP_ATOMIC);
>> if (ret == -ENOSPC) {
>> spin_unlock(&vgdev->ctrlq.qlock);
>> - wait_event(vgdev->ctrlq.ack_queue, vq->num_free);
>> + wait_event(vgdev->ctrlq.ack_queue, vq->num_free >= outcnt + incnt);
>> spin_lock(&vgdev->ctrlq.qlock);
>> goto retry;
>> } else {
>> @@ -368,7 +368,7 @@ static int virtio_gpu_queue_cursor(struct virtio_gpu_device *vgdev,
>> ret = virtqueue_add_sgs(vq, sgs, outcnt, 0, vbuf, GFP_ATOMIC);
>> if (ret == -ENOSPC) {
>> spin_unlock(&vgdev->cursorq.qlock);
>> - wait_event(vgdev->cursorq.ack_queue, vq->num_free);
>> + wait_event(vgdev->cursorq.ack_queue, vq->num_free >= outcnt);
>> spin_lock(&vgdev->cursorq.qlock);
>> goto retry;
>> } else {
>> --
>> 2.9.3
>>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-04-23 1:24 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2018-04-03 9:59 [PATCH] drm/virtio: fix vq wait_event condition Gerd Hoffmann
2018-04-20 7:22 ` Gerd Hoffmann
2018-04-23 1:24 ` Dave Airlie
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