On 2019-10-10 21:30:35 [+0100], Chris Wilson wrote:
> > | spin_lock_irq(>engine->active.lock);
> > | list_del(>sched.link);
> > | spin_unlock_irq(>engine->active.lock);
> > |
> > | spin_lock_irq(>lock);
> > | i915_request_mark_complete(rq);
> > …
> > |
Quoting Sebastian Andrzej Siewior (2019-10-10 19:26:10)
> On 2019-10-10 19:11:27 [+0100], Chris Wilson wrote:
> > > --- a/drivers/gpu/drm/i915/i915_request.c
> > > +++ b/drivers/gpu/drm/i915/i915_request.c
> > > @@ -251,15 +251,13 @@ static bool i915_request_retire(struct i
> > >
On 2019-10-10 19:11:27 [+0100], Chris Wilson wrote:
> > --- a/drivers/gpu/drm/i915/i915_request.c
> > +++ b/drivers/gpu/drm/i915/i915_request.c
> > @@ -251,15 +251,13 @@ static bool i915_request_retire(struct i
> > active->retire(active, rq);
> > }
> >
> > -
Quoting Sebastian Andrzej Siewior (2019-10-10 17:06:40)
> The locks (active.lock and rq->lock) need to be taken with disabled
> interrupts. This is done in i915_request_retire() by disabling the
> interrupts independently of the locks itself.
> While local_irq_disable()+spin_lock() equals
The locks (active.lock and rq->lock) need to be taken with disabled
interrupts. This is done in i915_request_retire() by disabling the
interrupts independently of the locks itself.
While local_irq_disable()+spin_lock() equals spin_lock_irq() on vanilla
it does not on PREEMPT_RT. Also, it is not
The locks (timeline->lock and rq->lock) need to be taken with disabled
interrupts. This is done in __retire_engine_request() by disabling the
interrupts independently of the locks itself.
While local_irq_disable()+spin_lock() equals spin_lock_irq() on vanilla
it does not on RT. Also, it is not
