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drm/i915: Postpone fake breadcrumb interrupt until real interrupts cease

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When the timer expires for checking on interrupt processing, check to
see if any interrupts arrived within the last time period. If real
interrupts are still being delivered, we can be reassured that we
haven't missed the final interrupt as the waiter will still be woken.
Only once all activity ceases, do we have to worry about the waiter
never being woken and so need to install a timer to kick the waiter for
a slow arrival of a seqno.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170217151304.16665-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2017-02-17 15:13:00 +00:00
parent 3bb56da781
commit 2246bea6cf
3 changed files with 12 additions and 14 deletions
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1
drivers/gpu/drm/i915/i915_irq.c
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@@ -1033,6 +1033,7 @@ static void ironlake_rps_change_irq_handler(struct drm_i915_private *dev_priv)
static void notify_ring(struct intel_engine_cs *engine)
{
atomic_inc(&engine->irq_count);
set_bit(ENGINE_IRQ_BREADCRUMB, &engine->irq_posted);
if (intel_engine_wakeup(engine))
trace_i915_gem_request_notify(engine);