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drm/i915/gt: Report the currently active execlists request

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Since commit 22b7a426bb ("drm/i915/execlists: Preempt-to-busy"), we
prune the engine->active.requests list prior to preemption, thus
removing the trace of the currently executing request. If that request
hangs rather than be preempted, we conclude that no active request was
on the GPU. Fortunately, this only impacts our debugging, and not our
means of hang detection or recovery.

v2: Use from to check the current iterator before continuing, and report
active as NULL if the current request is already completed.

References: 22b7a426bb ("drm/i915/execlists: Preempt-to-busy")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200117113259.3023890-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2020-01-17 11:32:59 +00:00
parent 89c02493de
commit 9452302436
1 changed files with 17 additions and 0 deletions
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17
drivers/gpu/drm/i915/gt/intel_engine_cs.c
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@@ -1657,6 +1657,23 @@ intel_engine_find_active_request(struct intel_engine_cs *engine)
* we only care about the snapshot of this moment.
*/
lockdep_assert_held(&engine->active.lock);
rcu_read_lock();
request = execlists_active(&engine->execlists);
if (request) {
struct intel_timeline *tl = request->context->timeline;
list_for_each_entry_from_reverse(request, &tl->requests, link) {
if (i915_request_completed(request))
break;
active = request;
}
}
rcu_read_unlock();
if (active)
return active;
list_for_each_entry(request, &engine->active.requests, sched.link) {
if (i915_request_completed(request))
continue;