On Mon, Mar 06, 2017 at 01:10:48PM +0100, Pavel Machek wrote:
> On Mon 2017-03-06 11:15:28, Chris Wilson wrote:
> > On Mon, Mar 06, 2017 at 12:01:51AM +0100, Pavel Machek wrote:
> > > Hi!
> > >
> > > > > mplayer stopped working after a while. Dmesg says:
> > > > >
> > > > > [ 3000.266533] cdc_ether 2-1.2:1.0 usb0: register 'cdc_ether' at
> > >
> > > Now I'm pretty sure it is a regression in v4.11-rc0. Any ideas what to
> > > try? Bisect will be slow and nasty :-(.
> >
> > I came the conclusion that #99671 is the ring HEAD overtaking the TAIL,
> > and under the presumption that your bug matches (as the symptoms do):
> >
> > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> > index 4ffa35faff49..62e31a7438ac 100644
> > --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> > @@ -782,10 +782,10 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request)
> > {
> > struct drm_i915_private *dev_priv = request->i915;
> >
> > - i915_gem_request_submit(request);
> > -
> > GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
> > I915_WRITE_TAIL(request->engine, request->tail);
> > +
> > + i915_gem_request_submit(request);
> > }
> >
> > static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req, u32 *cs)
>
> I applied it as:
>
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 91bc4ab..9c49c7a 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -1338,9 +1338,9 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request)
> {
> struct drm_i915_private *dev_priv = request->i915;
>
> - i915_gem_request_submit(request);
> -
> I915_WRITE_TAIL(request->engine, request->tail);
> +
> + i915_gem_request_submit(request);
> }
>
> static void i9xx_emit_breadcrumb(struct drm_i915_gem_request *req,
>
> Hmm. But your next mail suggest that it may not be smart to try to
> boot it? :-).
Don't bother, it'll promptly hang.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
