On Thu, 18 Mar 2021 at 17:04, Tvrtko Ursulin
<tvrtko.ursulin@xxxxxxxxxxxxxxx> wrote:
>
> From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
>
> Currently, we cancel outstanding requests within a context when the
> context is closed. We may also want to cancel individual requests using
> the same graceful preemption mechanism.
>
> v2 (Tvrtko):
> * Cancel waiters carefully considering no timeline lock and RCU.
> * Fixed selftests.
>
> v3 (Tvrtko):
> * Remove error propagation to waiters for now.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> ---
> .../gpu/drm/i915/gt/intel_engine_heartbeat.c | 1 +
> .../drm/i915/gt/intel_execlists_submission.c | 9 +-
> drivers/gpu/drm/i915/i915_request.c | 52 ++++-
> drivers/gpu/drm/i915/i915_request.h | 4 +-
> drivers/gpu/drm/i915/selftests/i915_request.c | 201 ++++++++++++++++++
> 5 files changed, 261 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
> index 0b062fad1837..e2fb3ae2aaf3 100644
> --- a/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
> +++ b/drivers/gpu/drm/i915/gt/intel_engine_heartbeat.c
> @@ -314,6 +314,7 @@ int intel_engine_pulse(struct intel_engine_cs *engine)
> mutex_unlock(&ce->timeline->mutex);
> }
>
> + intel_engine_flush_scheduler(engine);
> intel_engine_pm_put(engine);
> return err;
> }
> diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> index 85ff5fe861b4..4c2acb5a6c0a 100644
> --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> @@ -421,6 +421,11 @@ static void reset_active(struct i915_request *rq,
> ce->lrc.lrca = lrc_update_regs(ce, engine, head);
> }
>
> +static bool bad_request(const struct i915_request *rq)
> +{
> + return rq->fence.error && i915_request_started(rq);
> +}
> +
> static struct intel_engine_cs *
> __execlists_schedule_in(struct i915_request *rq)
> {
> @@ -433,7 +438,7 @@ __execlists_schedule_in(struct i915_request *rq)
> !intel_engine_has_heartbeat(engine)))
> intel_context_set_banned(ce);
>
> - if (unlikely(intel_context_is_banned(ce)))
> + if (unlikely(intel_context_is_banned(ce) || bad_request(rq)))
> reset_active(rq, engine);
>
> if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
> @@ -1112,7 +1117,7 @@ static unsigned long active_preempt_timeout(struct intel_engine_cs *engine,
> return 0;
>
> /* Force a fast reset for terminated contexts (ignoring sysfs!) */
> - if (unlikely(intel_context_is_banned(rq->context)))
> + if (unlikely(intel_context_is_banned(rq->context) || bad_request(rq)))
> return 1;
>
> return READ_ONCE(engine->props.preempt_timeout_ms);
> diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
> index e7b4c4bc41a6..b4511ac05e9a 100644
> --- a/drivers/gpu/drm/i915/i915_request.c
> +++ b/drivers/gpu/drm/i915/i915_request.c
> @@ -33,7 +33,10 @@
> #include "gem/i915_gem_context.h"
> #include "gt/intel_breadcrumbs.h"
> #include "gt/intel_context.h"
> +#include "gt/intel_engine.h"
> +#include "gt/intel_engine_heartbeat.h"
> #include "gt/intel_gpu_commands.h"
> +#include "gt/intel_reset.h"
> #include "gt/intel_ring.h"
> #include "gt/intel_rps.h"
>
> @@ -429,20 +432,22 @@ void __i915_request_skip(struct i915_request *rq)
> rq->infix = rq->postfix;
> }
>
> -void i915_request_set_error_once(struct i915_request *rq, int error)
> +bool i915_request_set_error_once(struct i915_request *rq, int error)
> {
> int old;
>
> GEM_BUG_ON(!IS_ERR_VALUE((long)error));
>
> if (i915_request_signaled(rq))
> - return;
> + return false;
>
> old = READ_ONCE(rq->fence.error);
> do {
> if (fatal_error(old))
> - return;
> + return false;
> } while (!try_cmpxchg(&rq->fence.error, &old, error));
> +
> + return true;
> }
>
> struct i915_request *i915_request_mark_eio(struct i915_request *rq)
> @@ -609,6 +614,47 @@ void i915_request_unsubmit(struct i915_request *request)
> spin_unlock_irqrestore(&se->lock, flags);
> }
>
> +static struct intel_engine_cs *active_engine(struct i915_request *rq)
> +{
> + struct intel_engine_cs *engine, *locked;
> +
> + locked = READ_ONCE(rq->engine);
> + spin_lock_irq(&locked->sched.lock);
> + while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) {
> + spin_unlock(&locked->sched.lock);
> + locked = engine;
> + spin_lock(&locked->sched.lock);
> + }
> +
> + engine = NULL;
> + if (i915_request_is_active(rq) && !__i915_request_is_complete(rq))
> + engine = locked;
> +
> + spin_unlock_irq(&locked->sched.lock);
> +
> + return engine;
Bad idea to reuse __active_engine() somehow?
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
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