There's a race between idling the engine and finishing off the last tasklet (as we may kick the tasklets after declaring an individual engine idle). However, since we do not need to access the device until we try to submit to the ELSP register (processing the CSB just requires normal CPU access to the HWSP, and when idle we should not need to submit!) we can defer the assertion unto that point. The assertion is still useful as it does verify that we do hold the longterm GT wakeref taken from request allocation until request completion. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107274 Fixes: 9512f985c32d ("drm/i915/execlists: Direct submission of new requests (avoid tasklet/ksoftirqd)") Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> --- drivers/gpu/drm/i915/intel_lrc.c | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index db5351e6a3a5..9d693e61536c 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -452,6 +452,16 @@ static void execlists_submit_ports(struct intel_engine_cs *engine) struct execlist_port *port = execlists->port; unsigned int n; + /* + * We can skip acquiring intel_runtime_pm_get() here as it was taken + * on our behalf by the request (see i915_gem_mark_busy()) and it will + * not be relinquished until the device is idle (see + * i915_gem_idle_work_handler()). As a precaution, we make sure + * that all ELSP are drained i.e. we have processed the CSB, + * before allowing ourselves to idle and calling intel_runtime_pm_put(). + */ + GEM_BUG_ON(!engine->i915->gt.awake); + /* * ELSQ note: the submit queue is not cleared after being submitted * to the HW so we need to make sure we always clean it up. This is @@ -1043,16 +1053,6 @@ static void __execlists_submission_tasklet(struct intel_engine_cs *const engine) { lockdep_assert_held(&engine->timeline.lock); - /* - * We can skip acquiring intel_runtime_pm_get() here as it was taken - * on our behalf by the request (see i915_gem_mark_busy()) and it will - * not be relinquished until the device is idle (see - * i915_gem_idle_work_handler()). As a precaution, we make sure - * that all ELSP are drained i.e. we have processed the CSB, - * before allowing ourselves to idle and calling intel_runtime_pm_put(). - */ - GEM_BUG_ON(!engine->i915->gt.awake); - process_csb(engine); if (!execlists_is_active(&engine->execlists, EXECLISTS_ACTIVE_PREEMPT)) execlists_dequeue(engine); @@ -1073,10 +1073,7 @@ static void execlists_submission_tasklet(unsigned long data) engine->execlists.active); spin_lock_irqsave(&engine->timeline.lock, flags); - - if (engine->i915->gt.awake) /* we may be delayed until after we idle! */ - __execlists_submission_tasklet(engine); - + __execlists_submission_tasklet(engine); spin_unlock_irqrestore(&engine->timeline.lock, flags); } -- 2.18.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
