From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
When run as a timer, i915_hangcheck_elapsed() must adhere to all the
rules of running in a softirq context. This is advantageous to us as we
want to minimise the risk that a driver bug will prevent us from
detecting a hung GPU. However, that is irrelevant if the driver bug
prevents us from resetting and recovering. Still it is prudent not to
rely on mutexes inside the checker, but given the coarseness of
dev->struct_mutex doing so is extremely hard.
Give in and run from a work queue, i.e. outside of softirq.
v2: Use own workqueue to avoid deadlocks (Daniel)
Cleanup commit msg and add comment to i915_queue_hangcheck() (Chris)
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Daniel Vetter <dnaiel.vetter@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> (v1)
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_dma.c | 13 ++++++++++++-
drivers/gpu/drm/i915/i915_drv.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 3 ++-
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/i915_irq.c | 28 +++++++++++++++-------------
5 files changed, 31 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 51e8fe5..6eaf795 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -790,6 +790,14 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
goto out_freewq;
}
+ dev_priv->gpu_error.hangcheck_wq =
+ alloc_ordered_workqueue("i915-hangcheck", 0);
+ if (dev_priv->gpu_error.hangcheck_wq == NULL) {
+ DRM_ERROR("Failed to create our hangcheck workqueue.\n");
+ ret = -ENOMEM;
+ goto out_freedpwq;
+ }
+
intel_irq_init(dev_priv);
intel_uncore_sanitize(dev);
@@ -864,6 +872,8 @@ out_gem_unload:
intel_teardown_gmbus(dev);
intel_teardown_mchbar(dev);
pm_qos_remove_request(&dev_priv->pm_qos);
+ destroy_workqueue(dev_priv->gpu_error.hangcheck_wq);
+out_freedpwq:
destroy_workqueue(dev_priv->dp_wq);
out_freewq:
destroy_workqueue(dev_priv->wq);
@@ -934,7 +944,7 @@ int i915_driver_unload(struct drm_device *dev)
}
/* Free error state after interrupts are fully disabled. */
- del_timer_sync(&dev_priv->gpu_error.hangcheck_timer);
+ cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
cancel_work_sync(&dev_priv->gpu_error.work);
i915_destroy_error_state(dev);
@@ -960,6 +970,7 @@ int i915_driver_unload(struct drm_device *dev)
destroy_workqueue(dev_priv->dp_wq);
destroy_workqueue(dev_priv->wq);
+ destroy_workqueue(dev_priv->gpu_error.hangcheck_wq);
pm_qos_remove_request(&dev_priv->pm_qos);
i915_global_gtt_cleanup(dev);
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 66c72bd..cb1468d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1396,7 +1396,7 @@ static int intel_runtime_suspend(struct device *device)
return ret;
}
- del_timer_sync(&dev_priv->gpu_error.hangcheck_timer);
+ cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
intel_uncore_forcewake_reset(dev, false);
dev_priv->pm.suspended = true;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0d67b17..a4eb023 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1345,7 +1345,8 @@ struct i915_gpu_error {
/* Hang gpu twice in this window and your context gets banned */
#define DRM_I915_CTX_BAN_PERIOD DIV_ROUND_UP(8*DRM_I915_HANGCHECK_PERIOD, 1000)
- struct timer_list hangcheck_timer;
+ struct workqueue_struct *hangcheck_wq;
+ struct delayed_work hangcheck_work;
/* For reset and error_state handling. */
spinlock_t lock;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index fc81889..8a178cd 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4615,7 +4615,7 @@ i915_gem_suspend(struct drm_device *dev)
i915_gem_stop_ringbuffers(dev);
mutex_unlock(&dev->struct_mutex);
- del_timer_sync(&dev_priv->gpu_error.hangcheck_timer);
+ cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
cancel_delayed_work_sync(&dev_priv->mm.retire_work);
flush_delayed_work(&dev_priv->mm.idle_work);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 2399eae..234b1f7 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2982,10 +2982,12 @@ ring_stuck(struct intel_engine_cs *ring, u64 acthd)
* we kick the ring. If we see no progress on three subsequent calls
* we assume chip is wedged and try to fix it by resetting the chip.
*/
-static void i915_hangcheck_elapsed(unsigned long data)
+static void i915_hangcheck_elapsed(struct work_struct *work)
{
- struct drm_device *dev = (struct drm_device *)data;
- struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_i915_private *dev_priv =
+ container_of(work, typeof(*dev_priv),
+ gpu_error.hangcheck_work.work);
+ struct drm_device *dev = dev_priv->dev;
struct intel_engine_cs *ring;
int i;
int busy_count = 0, rings_hung = 0;
@@ -3099,17 +3101,18 @@ static void i915_hangcheck_elapsed(unsigned long data)
void i915_queue_hangcheck(struct drm_device *dev)
{
- struct drm_i915_private *dev_priv = dev->dev_private;
- struct timer_list *timer = &dev_priv->gpu_error.hangcheck_timer;
+ struct i915_gpu_error *e = &to_i915(dev)->gpu_error;
if (!i915.enable_hangcheck)
return;
- /* Don't continually defer the hangcheck, but make sure it is active */
- if (timer_pending(timer))
- return;
- mod_timer(timer,
- round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES));
+ /* Don't continually defer the hangcheck so that it is always run at
+ * least once after work has been scheduled on any ring. Otherwise,
+ * we will ignore a hung ring if a second ring is kept busy.
+ */
+
+ queue_delayed_work(e->hangcheck_wq, &e->hangcheck_work,
+ round_jiffies_up_relative(DRM_I915_HANGCHECK_JIFFIES));
}
static void ibx_irq_reset(struct drm_device *dev)
@@ -4353,9 +4356,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
else
dev_priv->pm_rps_events = GEN6_PM_RPS_EVENTS;
- setup_timer(&dev_priv->gpu_error.hangcheck_timer,
- i915_hangcheck_elapsed,
- (unsigned long) dev);
+ INIT_DELAYED_WORK(&dev_priv->gpu_error.hangcheck_work,
+ i915_hangcheck_elapsed);
INIT_DELAYED_WORK(&dev_priv->hotplug_reenable_work,
intel_hpd_irq_reenable_work);
--
1.9.1
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