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drm/i915: Only trigger missed-seqno checking next to boundary

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If we have more interrupts pending (because we know there are more
breadcrumb signals before the completion), then we do not need to
trigger an irq_seqno_barrier or even wakeup the task on this interrupt
as there will be another. To allow some margin of error (we are trying
to work around incoherent seqno after all), we wakeup the breadcrumb
before the target as well as on the target.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180627201304.15817-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-06-27 21:13:02 +01:00
parent 3f88325c2e
commit 69dc4d003e
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_irq.c
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@ -1191,7 +1191,8 @@ static void notify_ring(struct intel_engine_cs *engine)
tsk = wait->tsk;
} else {
if (engine->irq_seqno_barrier) {
if (engine->irq_seqno_barrier &&
i915_seqno_passed(seqno, wait->seqno - 1)) {
set_bit(ENGINE_IRQ_BREADCRUMB,
&engine->irq_posted);
tsk = wait->tsk;