Hi! > Reported-by: Jens Axboe <axboe@xxxxxxxxx> > Link: https://lkml.org/lkml/2015/11/12/621 > Cc: Jens Axboe <axboe@xxxxxxxxx> > Cc; "Rogozhkin, Dmitry V" <dmitry.v.rogozhkin@xxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx> > Cc: Eero Tamminen <eero.t.tamminen@xxxxxxxxx> > Cc: "Rantala, Valtteri" <valtteri.rantala@xxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > --- > drivers/gpu/drm/i915/i915_gem.c | 28 +++++++++++++++++++++++++--- > 1 file changed, 25 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c > index 740530c571d1..2a88158bd1f7 100644 > --- a/drivers/gpu/drm/i915/i915_gem.c > +++ b/drivers/gpu/drm/i915/i915_gem.c > @@ -1146,14 +1146,36 @@ static bool missed_irq(struct drm_i915_private *dev_priv, > return test_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings); > } > > +static u64 local_clock_us(unsigned *cpu) > +{ > + u64 t; > + > + *cpu = get_cpu(); > + t = local_clock() >> 10; > + put_cpu(); > + > + return t; > +} > + > +static bool busywait_stop(u64 timeout, unsigned cpu) > +{ > + unsigned this_cpu; > + > + if (time_after64(local_clock_us(&this_cpu), timeout)) > + return true; > + > + return this_cpu != cpu; > +} Perhaps you want to ask the timekeeping people for the right primitive? I guess you are not the only one needing this.. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
