[Intel-gfx] [PATCH 2/2] drm/i915: Postpone fake breadcrumb interrupt if a real interrupt is pending
Chris Wilson
chris at chris-wilson.co.uk
Thu Feb 16 09:29:59 UTC 2017
If the timer expires for enabling the fake interrupt, check to see
if there is a real interrupt queued before making the decision to start
polling. This helps in situations where we have a very slow irq-seqno
barrier that may accrue more breadcrumb interrupts before it is able to
catch up. It still leaves a hole for the timer to expire as we are
processing the last irq-seqno barrier, but it appears to help reduce the
frequency of "missed-interrupts" on Ironlake, at least.
References: https://bugs.freedesktop.org/show_bug.cgi?id=99816
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/intel_breadcrumbs.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index ef3adfd37d7d..21269421bd2a 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -41,6 +41,11 @@ static void intel_breadcrumbs_hangcheck(unsigned long data)
return;
}
+ if (test_bit(ENGINE_IRQ_BREADCRUMB, &engine->irq_posted)) {
+ mod_timer(&b->hangcheck, jiffies + 1);
+ return;
+ }
+
DRM_DEBUG("Hangcheck timer elapsed... %s idle\n", engine->name);
set_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
mod_timer(&engine->breadcrumbs.fake_irq, jiffies + 1);
--
2.11.0
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