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drm/i915/gt: Restrict forced preemption to the active context 

When we submit a new pair of contexts to ELSP for execution, we start a
timer by which point we expect the HW to have switched execution to the
pending contexts. If the promotion to the new pair of contexts has not
occurred, we declare the executing context to have hung and force the
preemption to take place by resetting the engine and resubmitting the
new contexts.

This can lead to an unfair situation where almost all of the preemption
timeout is consumed by the first context which just switches into the
second context immediately prior to the timer firing and triggering the
preemption reset (assuming that the timer interrupts before we process
the CS events for the context switch). The second context hasn't yet had
a chance to yield to the incoming ELSP (and send the ACk for the
promotion) and so ends up being blamed for the reset.

If we see that a context switch has occurred since setting the
preemption timeout, but have not yet received the ACK for the ELSP
promotion, rearm the preemption timer and check again. This is
especially significant if the first context was not schedulable and so
we used the shortest timer possible, greatly increasing the chance of
accidentally blaming the second innocent context.

Fixes: 3a7a92aba8 ("drm/i915/execlists: Force preemption")
Fixes: d12acee84f ("drm/i915/execlists: Cancel banned contexts on schedule-out")
Reported-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Tested-by: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: <stable@vger.kernel.org> # v5.5+
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220921135258.1714873-1-andrzej.hajda@intel.com
(cherry picked from commit 107ba1a2c7)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Chris Wilson 2022-09-21 15:52:58 +02:00 committed by Rodrigo Vivi
parent f76349cf41
commit 6ef7d36212
2 changed files with 35 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpu/drm/i915/gt/intel_engine_types.h
View File

@ -165,6 +165,21 @@ struct intel_engine_execlists {
*/
struct timer_list preempt;
/**
* @preempt_target: active request at the time of the preemption request
*
* We force a preemption to occur if the pending contexts have not
* been promoted to active upon receipt of the CS ack event within
* the timeout. This timeout maybe chosen based on the target,
* using a very short timeout if the context is no longer schedulable.
* That short timeout may not be applicable to other contexts, so
* if a context switch should happen within before the preemption
* timeout, we may shoot early at an innocent context. To prevent this,
* we record which context was active at the time of the preemption
* request and only reset that context upon the timeout.
*/
const struct i915_request *preempt_target;
/**
* @ccid: identifier for contexts submitted to this engine
*/

21
drivers/gpu/drm/i915/gt/intel_execlists_submission.c
View File

@ -1241,6 +1241,9 @@ static unsigned long active_preempt_timeout(struct intel_engine_cs *engine,
if (!rq)
return 0;
/* Only allow ourselves to force reset the currently active context */
engine->execlists.preempt_target = rq;
/* Force a fast reset for terminated contexts (ignoring sysfs!) */
if (unlikely(intel_context_is_banned(rq->context) || bad_request(rq)))
return INTEL_CONTEXT_BANNED_PREEMPT_TIMEOUT_MS;
@ -2427,8 +2430,24 @@ static void execlists_submission_tasklet(struct tasklet_struct *t)
GEM_BUG_ON(inactive - post > ARRAY_SIZE(post));
if (unlikely(preempt_timeout(engine))) {
const struct i915_request *rq = *engine->execlists.active;
/*
* If after the preempt-timeout expired, we are still on the
* same active request/context as before we initiated the
* preemption, reset the engine.
*
* However, if we have processed a CS event to switch contexts,
* but not yet processed the CS event for the pending
* preemption, reset the timer allowing the new context to
* gracefully exit.
*/
cancel_timer(&engine->execlists.preempt);
engine->execlists.error_interrupt |= ERROR_PREEMPT;
if (rq == engine->execlists.preempt_target)
engine->execlists.error_interrupt |= ERROR_PREEMPT;
else
set_timer_ms(&engine->execlists.preempt,
active_preempt_timeout(engine, rq));
}
if (unlikely(READ_ONCE(engine->execlists.error_interrupt))) {