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drm/i915: Update the breadcrumb interrupt counter before enabling

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In order to close a race with a long running hangcheck comparing a stale
interrupt counter with a just started waiter, we need to first bump the
counter as we start the fresh wait.

References: https://bugs.freedesktop.org/show_bug.cgi?id=96974
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469351421-13493-2-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-07-24 10:10:21 +01:00
parent 2529d57050
commit f527a38ee7
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/i915/intel_breadcrumbs.c
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@ -51,6 +51,13 @@ static void irq_enable(struct intel_engine_cs *engine)
*/
engine->breadcrumbs.irq_posted = true;
/* Make sure the current hangcheck doesn't falsely accuse a just
* started irq handler from missing an interrupt (because the
* interrupt count still matches the stale value from when
* the irq handler was disabled, many hangchecks ago).
*/
engine->breadcrumbs.irq_wakeups++;
spin_lock_irq(&engine->i915->irq_lock);
engine->irq_enable(engine);
spin_unlock_irq(&engine->i915->irq_lock);