Commit 5427f207 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Bump wait-times for the final CS interrupt before parking 



In the idle worker we drop the prolonged GT wakeref used to cover such
essentials as interrupt delivery. (When a CS interrupt arrives, we also
assert that the GT is awake.) However, it turns out that 10ms is not
long enough to be assured that the last CS interrupt has been delivered,
so bump that to 200ms, and move the entirety of that wait to before we
take the struct_mutex to avoid blocking. As this is now a potentially
long wait, restore the earlier behaviour of bailing out early when a new
request arrives.

v2: Break out the repeated check for new requests into its own little
helper to try and improve the self-commentary.

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171023213237.26536-1-chris@chris-wilson.co.uk
parent cdc1cdca

drivers/gpu/drm/i915/i915_gem.c

+26 −11
Original line number Diff line number Diff line
@@ -3276,13 +3276,20 @@ i915_gem_retire_work_handler(struct work_struct *work) 
	}

}



static inline bool

new_requests_since_last_retire(const struct drm_i915_private *i915)

{

	return (READ_ONCE(i915->gt.active_requests) ||

		work_pending(&i915->gt.idle_work.work));

}



static void

i915_gem_idle_work_handler(struct work_struct *work)

{

	struct drm_i915_private *dev_priv =

		container_of(work, typeof(*dev_priv), gt.idle_work.work);

	struct drm_device *dev = &dev_priv->drm;

	bool rearm_hangcheck;

	ktime_t end;



	if (!READ_ONCE(dev_priv->gt.awake))

		return;
@@ -3291,14 +3298,21 @@ i915_gem_idle_work_handler(struct work_struct *work) 
	 * Wait for last execlists context complete, but bail out in case a

	 * new request is submitted.

	 */

	wait_for(intel_engines_are_idle(dev_priv), 10);

	if (READ_ONCE(dev_priv->gt.active_requests))

	end = ktime_add_ms(ktime_get(), 200);

	do {

		if (new_requests_since_last_retire(dev_priv))

			return;



		if (intel_engines_are_idle(dev_priv))

			break;



		usleep_range(100, 500);

	} while (ktime_before(ktime_get(), end));



	rearm_hangcheck =

		cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);



	if (!mutex_trylock(&dev->struct_mutex)) {

	if (!mutex_trylock(&dev_priv->drm.struct_mutex)) {

		/* Currently busy, come back later */

		mod_delayed_work(dev_priv->wq,

				 &dev_priv->gt.idle_work,
@@ -3310,13 +3324,14 @@ i915_gem_idle_work_handler(struct work_struct *work) 
	 * New request retired after this work handler started, extend active

	 * period until next instance of the work.

	 */

	if (work_pending(work))

		goto out_unlock;



	if (dev_priv->gt.active_requests)

	if (new_requests_since_last_retire(dev_priv))

		goto out_unlock;



	if (wait_for(intel_engines_are_idle(dev_priv), 10))

	/*

	 * We are committed now to parking the engines, make sure there

	 * will be no more interrupts arriving later.

	 */

	if (!intel_engines_are_idle(dev_priv))

		DRM_ERROR("Timeout waiting for engines to idle\n");



	intel_engines_mark_idle(dev_priv);
@@ -3330,7 +3345,7 @@ i915_gem_idle_work_handler(struct work_struct *work) 
		gen6_rps_idle(dev_priv);

	intel_runtime_pm_put(dev_priv);

out_unlock:

	mutex_unlock(&dev->struct_mutex);

	mutex_unlock(&dev_priv->drm.struct_mutex);



out_rearm:

	if (rearm_hangcheck) {

CRA Git | Maintained and supported by SUSTech CRA and CCSE