drm/i915/guc: don't spinwait if the GuC's workqueue is full

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Rather than wait to see whether more space becomes available in the GuC
submission workqueue, we can just return -EAGAIN and let the caller try
again in a little while. This gets rid of an uninterruptable sleep in
the polling code :)

We'll also add a counter to the GuC client statistics, to see how often
we find the WQ full.

v2:
    Flag the likely() code path (Tvtrko Ursulin).

v4:
    Add/update comments about failure counters (Tvtrko Ursulin).

Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

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This commit is contained in:

Dave Gordon 2016-05-13 15:36:33 +01:00 • committed by Tvrtko Ursulin

parent 7c2c270d27

commit 551aaecd88

3 changed files with 24 additions and 17 deletions

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1

drivers/gpu/drm/i915/i915_debugfs.c

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18

drivers/gpu/drm/i915/i915_guc_submission.c

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22

drivers/gpu/drm/i915/intel_guc.h

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