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drm/i915/gt: Adapt engine_park synchronisation rules for engine_retire
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In the next patch, we will introduce a new asynchronous retirement
worker, fed by execlists CS events. Here we may queue a retirement as
soon as a request is submitted to HW (and completes instantly), and we
also want to process that retirement as early as possible and cannot
afford to postpone (as there may not be another opportunity to retire it
for a few seconds). To allow the new async retirer to run in parallel
with our submission, pull the __i915_request_queue (that passes the
request to HW) inside the timelines spinlock so that the retirement
cannot release the timeline before we have completed the submission.

v2: Actually to play nicely with engine_retire, we have to raise the
timeline.active_lock before releasing the HW. intel_gt_retire_requsts()
is still serialised by the outer lock so they cannot see this
intermediate state, and engine_retire is serialised by HW submission.

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/20191125105858.1718307-2-chris@chris-wilson.co.uk
(cherry picked from commit 88a4655)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
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Chris Wilson authored and Joonas Lahtinen committed Nov 25, 2019
1 parent 4ec5cc7 commit a09c286
Showing 1 changed file with 21 additions and 6 deletions.
27 changes: 21 additions & 6 deletions drivers/gpu/drm/i915/gt/intel_engine_pm.c
Original file line number Diff line number Diff line change
Expand Up @@ -74,16 +74,33 @@ static inline void __timeline_mark_unlock(struct intel_context *ce,
#endif /* !IS_ENABLED(CONFIG_LOCKDEP) */

static void
__intel_timeline_enter_and_release_pm(struct intel_timeline *tl,
struct intel_engine_cs *engine)
__queue_and_release_pm(struct i915_request *rq,
struct intel_timeline *tl,
struct intel_engine_cs *engine)
{
struct intel_gt_timelines *timelines = &engine->gt->timelines;

GEM_TRACE("%s\n", engine->name);

/*
* We have to serialise all potential retirement paths with our
* submission, as we don't want to underflow either the
* engine->wakeref.counter or our timeline->active_count.
*
* Equally, we cannot allow a new submission to start until
* after we finish queueing, nor could we allow that submitter
* to retire us before we are ready!
*/
spin_lock(&timelines->lock);

/* Let intel_gt_retire_requests() retire us (acquired under lock) */
if (!atomic_fetch_inc(&tl->active_count))
list_add_tail(&tl->link, &timelines->active_list);

/* Hand the request over to HW and so engine_retire() */
__i915_request_queue(rq, NULL);

/* Let new submissions commence (and maybe retire this timeline) */
__intel_wakeref_defer_park(&engine->wakeref);

spin_unlock(&timelines->lock);
Expand Down Expand Up @@ -148,10 +165,8 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine)
rq->sched.attr.priority = I915_PRIORITY_BARRIER;
__i915_request_commit(rq);

__i915_request_queue(rq, NULL);

/* Expose ourselves to intel_gt_retire_requests() and new submission */
__intel_timeline_enter_and_release_pm(ce->timeline, engine);
/* Expose ourselves to the world */
__queue_and_release_pm(rq, ce->timeline, engine);

result = false;
out_unlock:
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