On 03/05/2019 12:52, Chris Wilson wrote:
Do not treat reset as a normal preemption event and avoid giving the
guilty request a priority boost for simply being active at the time of
reset.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index afcdfc440bbd..6419bcaf1ecc 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -371,11 +371,11 @@ static void unwind_wa_tail(struct i915_request *rq)
}
static struct i915_request *
-__unwind_incomplete_requests(struct intel_engine_cs *engine)
+__unwind_incomplete_requests(struct intel_engine_cs *engine, int boost)
{
struct i915_request *rq, *rn, *active = NULL;
struct list_head *uninitialized_var(pl);
- int prio = I915_PRIORITY_INVALID | ACTIVE_PRIORITY;
+ int prio = I915_PRIORITY_INVALID | boost;
lockdep_assert_held(&engine->timeline.lock);
@@ -419,8 +419,9 @@ __unwind_incomplete_requests(struct intel_engine_cs *engine)
* in the priority queue, but they will not gain immediate access to
* the GPU.
*/
- if (~prio & ACTIVE_PRIORITY && __i915_request_has_started(active)) {
- prio |= ACTIVE_PRIORITY;
+ if (~prio & boost && __i915_request_has_started(active)) {
+ prio |= boost;
+ GEM_BUG_ON(active->sched.attr.priority >= prio);
active->sched.attr.priority = prio;
list_move_tail(&active->sched.link,
i915_sched_lookup_priolist(engine, prio));
@@ -435,7 +436,7 @@ execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists)
struct intel_engine_cs *engine =
container_of(execlists, typeof(*engine), execlists);
- return __unwind_incomplete_requests(engine);
+ return __unwind_incomplete_requests(engine, 0);
}
static inline void
@@ -656,7 +657,8 @@ static void complete_preempt_context(struct intel_engine_execlists *execlists)
execlists_cancel_port_requests(execlists);
__unwind_incomplete_requests(container_of(execlists,
struct intel_engine_cs,
- execlists));
+ execlists),
+ ACTIVE_PRIORITY);
}
static void execlists_dequeue(struct intel_engine_cs *engine)
@@ -1909,7 +1911,7 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled)
execlists_cancel_port_requests(execlists);
/* Push back any incomplete requests for replay after the reset. */
- rq = __unwind_incomplete_requests(engine);
+ rq = __unwind_incomplete_requests(engine, 0);
if (!rq)
goto out_replay;
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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