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drm/i915/pmu: Always sample an active ringbuffer

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As we no longer have a precise indication of requests queued to an
engine, make no presumptions and just sample the ring registers to see
if the engine is busy.

v2: Report busy while the ring is idling on a semaphore/event.
v3: Give the struct a name!
v4: Always 0 outside the powerwell; trusting the powerwell is
accurate enough for our sampling pmu.
v5: Protect against gen7 mmio madness and try to improve grammar

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190223000102.14290-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-02-23 00:01:02 +00:00
parent 0a3317d43d
commit d0aa694b92
2 changed files with 29 additions and 38 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -392,7 +392,7 @@ struct intel_engine_cs {
bool irq_armed;
} breadcrumbs;
struct {
struct intel_engine_pmu {
/**
* @enable: Bitmask of enable sample events on this engine.
*