On Tue, Apr 14, 2015 at 08:22:20PM +0200, Mario Kleiner wrote:
> On 04/05/2015 05:40 PM, Chris Wilson wrote:
> >Avoid adding to the waitqueue and reprobing the current vblank if the
> >caller is only querying the current vblank sequence and timestamp and
> >so we would return immediately.
> >
> >Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> >Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >Cc: Daniel Vetter <daniel@xxxxxxxx>
> >Cc: Michel Dänzer <michel@xxxxxxxxxxx>
> >Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> >Cc: Dave Airlie <airlied@xxxxxxxxxx>,
> >Cc: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
> >---
> > drivers/gpu/drm/drm_irq.c | 18 ++++++++++--------
> > 1 file changed, 10 insertions(+), 8 deletions(-)
> >
> >diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> >index 6f5dc18779e2..ba80b51b4b00 100644
> >--- a/drivers/gpu/drm/drm_irq.c
> >+++ b/drivers/gpu/drm/drm_irq.c
> >@@ -1617,14 +1617,16 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
> > vblwait->request.sequence = seq + 1;
> > }
> >
> >- DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
> >- vblwait->request.sequence, crtc);
> >- vblank->last_wait = vblwait->request.sequence;
> >- DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
> >- (((drm_vblank_count(dev, crtc) -
> >- vblwait->request.sequence) <= (1 << 23)) ||
> >- !vblank->enabled ||
> >- !dev->irq_enabled));
> >+ if (vblwait->request.sequence != seq) {
> >+ DRM_DEBUG("waiting on vblank count %d, crtc %d\n",
> >+ vblwait->request.sequence, crtc);
> >+ vblank->last_wait = vblwait->request.sequence;
> >+ DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
> >+ (((drm_vblank_count(dev, crtc) -
> >+ vblwait->request.sequence) <= (1 << 23)) ||
> >+ !vblank->enabled ||
> >+ !dev->irq_enabled));
> >+ }
> >
> > if (ret != -EINTR) {
> > struct timeval now;
> >
>
> It would be good to have some DRM_DEBUG output for the skip-the-wait
> case as well, so one can still follow from dmesg output when a
> client does a drmWaitVblank call even if it is only a query.
We still have DRM_DEBUG("returning %d to client"), as well as the
drmIoctl:DRM_DEBUG(ioctl->name), is that not sufficient?
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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