[Intel-gfx] [PATCH v6 19/34] drm/i915: Add scheduler hook to GPU reset

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

When the watchdog resets the GPU, all interrupts get disabled despite
the reference count remaining. As the scheduler probably had
interrupts enabled during the reset (it would have been waiting for
the bad batch to complete), it must be poked to tell it that the
interrupt has been disabled.

v5: New patch in series.

v6: Updated to newer nightly (lots of ring -> engine renaming).

Updated to use 'to_i915()' instead of dev_private. Converted all enum
labels to uppercase. [review feedback from Joonas Lahtinen]

For: VIZ-1587
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c       |  2 ++
 drivers/gpu/drm/i915/i915_scheduler.c | 11 +++++++++++
 drivers/gpu/drm/i915/i915_scheduler.h |  1 +
 3 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 3ee0283..ebc7f0a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3327,6 +3327,8 @@ static void i915_gem_reset_engine_cleanup(struct drm_i915_private *dev_priv,
 	}
 
 	intel_ring_init_seqno(engine, engine->last_submitted_seqno);
+
+	i915_scheduler_reset_cleanup(engine);
 }
 
 void i915_gem_reset(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index 580b9d2..9c3150a 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -821,6 +821,17 @@ void i915_scheduler_clean_node(struct i915_scheduler_queue_entry *node)
 	}
 }
 
+void i915_scheduler_reset_cleanup(struct intel_engine_cs *engine)
+{
+	struct drm_i915_private *dev_priv = to_i915(engine->dev);
+	struct i915_scheduler *scheduler = dev_priv->scheduler;
+
+	if (scheduler->flags[engine->id] & I915_SF_INTERRUPTS_ENABLED) {
+		engine->irq_put(engine);
+		scheduler->flags[engine->id] &= ~I915_SF_INTERRUPTS_ENABLED;
+	}
+}
+
 static bool i915_scheduler_remove(struct i915_scheduler *scheduler,
 				  struct intel_engine_cs *engine,
 				  struct list_head *remove)
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index 92dd5df..4e7c0a7 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -106,6 +106,7 @@ bool i915_scheduler_is_enabled(struct drm_device *dev);
 int i915_scheduler_init(struct drm_device *dev);
 void i915_scheduler_destroy(struct drm_i915_private *dev_priv);
 void i915_scheduler_closefile(struct drm_device *dev, struct drm_file *file);
+void i915_scheduler_reset_cleanup(struct intel_engine_cs *engine);
 void i915_scheduler_clean_node(struct i915_scheduler_queue_entry *node);
 int i915_scheduler_queue_execbuffer(struct i915_scheduler_queue_entry *qe);
 bool i915_scheduler_notify_request(struct drm_i915_gem_request *req);
-- 
1.9.1