[PATCH 1/2] drm/i915: Bump wait-times for the final CS interrupt before parking

Chris Wilson
2017-10-20T10:00:05Z

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.

Signed-off-by: Chris 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>
---
drivers/gpu/drm/i915/i915_gem.c | 31 ++++++++++++++++++++-----------
1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 026cb52ece0b..d3a638613857 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3281,8 +3281,8 @@ 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 +3291,22 @@ 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))
- return;
+ end = ktime_add_ms(ktime_get(), 200);
+ do {
+ if (READ_ONCE(dev_priv->gt.active_requests) ||
+ work_pending(work))
+ 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 +3318,14 @@ 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))
+ if (dev_priv->gt.active_requests || work_pending(work))
goto out_unlock;

- if (dev_priv->gt.active_requests)
- 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 +3339,7 @@ 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) {
--
2.15.0.rc1