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drm/i915/execlists: Mark up priority boost on preemption 

Record the priority boost we giving to the preempted client or else we
may end up in a situation where the priority queue no longer matches the
request priority order and so we can end up in an infinite loop of
preempting the same pair of requests.

Fixes: e9eaf82d97 ("drm/i915: Priority boost for waiting clients")
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: https://patchwork.freedesktop.org/patch/msgid/20190123135155.21562-1-chris@chris-wilson.co.uk
(cherry picked from commit 6e062b60b0)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2019-01-23 13:51:55 +00:00 committed by Jani Nikula
parent 49a57857ae
commit 2b24408158
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/intel_lrc.c
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@ -303,6 +303,7 @@ static void __unwind_incomplete_requests(struct intel_engine_cs *engine)
*/
if (!(prio & I915_PRIORITY_NEWCLIENT)) {
prio |= I915_PRIORITY_NEWCLIENT;
active->sched.attr.priority = prio;
list_move_tail(&active->sched.link,
i915_sched_lookup_priolist(engine, prio));
}
@ -645,6 +646,9 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
int i;
priolist_for_each_request_consume(rq, rn, p, i) {
GEM_BUG_ON(last &&
need_preempt(engine, last, rq_prio(rq)));
/*
* Can we combine this request with the current port?
* It has to be the same context/ringbuffer and not