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drm/i915/execlists: Clear semaphore immediately upon ELSP promotion

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There is no significance to our delay before clearing the semaphore the
engine is waiting on, so release it as soon as we acknowledge the CS
update following our preemption request. This should allow the GPU to
resume work earlier, if it was stuck on the semaphore at the end of a
request.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191015093204.25693-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-10-15 10:32:04 +01:00
parent 454a325a97
commit 8b390c1581
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/gt/intel_lrc.c
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@@ -1910,6 +1910,9 @@ static void process_csb(struct intel_engine_cs *engine)
else
promote = gen8_csb_parse(execlists, buf + 2 * head);
if (promote) {
if (!inject_preempt_hang(execlists))
ring_set_paused(engine, 0);
/* cancel old inflight, prepare for switch */
trace_ports(execlists, "preempted", execlists->active);
while (*execlists->active)
@@ -1926,9 +1929,6 @@ static void process_csb(struct intel_engine_cs *engine)
if (enable_timeslice(execlists))
mod_timer(&execlists->timer, jiffies + 1);
if (!inject_preempt_hang(execlists))
ring_set_paused(engine, 0);
WRITE_ONCE(execlists->pending[0], NULL);
} else {
GEM_BUG_ON(!*execlists->active);