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drm/i915: Flush the tasklet when checking for idle 

In order to reduce latency when checking for idle we kick the tasklet
directly. Sometimes this is not enough as it is queued on another cpu
and so to improve the accuracy of this idle-check (and so to reduce
latency overall by avoiding another pass, or worse declaring a timeout!)
wait for the tasklet to complete.

References: https://bugs.freedesktop.org/show_bug.cgi?id=107916
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180914080017.30308-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-09-14 09:00:16 +01:00
parent 11abf0c5a0
commit 22495b68f9
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_engine_cs.c
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@ -990,6 +990,9 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
}
local_bh_enable();
/* Otherwise flush the tasklet if it was on another cpu */
tasklet_unlock_wait(t);
if (READ_ONCE(engine->execlists.active))
return false;
}