[RFC 24/44] drm/i915: Added scheduler interrupt handler hook

[John.C.Harrison@Intel.com]

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

The scheduler needs to be informed of each batch buffer completion. This is done
via the user interrupt mechanism. The epilogue of each batch buffer submission
updates a sequence number value (seqno) and triggers a user interrupt.

This change hooks the scheduler in to the processing of that interrupt via the
notify_ring() function. The scheduler also has clean up code that needs to be
done outside of the interrupt context, thus notify_ring() now also pokes the
scheduler's work queue.
---
 drivers/gpu/drm/i915/i915_irq.c       |    3 +++
 drivers/gpu/drm/i915/i915_scheduler.c |   16 ++++++++++++++++
 drivers/gpu/drm/i915/i915_scheduler.h |    1 +
 3 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index eff08a3e..7089242 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -36,6 +36,7 @@
 #include "i915_drv.h"
 #include "i915_trace.h"
 #include "intel_drv.h"
+#include "i915_scheduler.h"
 
 static const u32 hpd_ibx[] = {
 	[HPD_CRT] = SDE_CRT_HOTPLUG,
@@ -1218,6 +1219,8 @@ static void notify_ring(struct drm_device *dev,
 
 	trace_i915_gem_request_complete(ring);
 
+	i915_scheduler_handle_IRQ(ring);
+
 	wake_up_all(&ring->irq_queue);
 	i915_queue_hangcheck(dev);
 }
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index fc165c2..1e4d7c313 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -92,6 +92,17 @@ int i915_scheduler_queue_execbuffer(struct i915_scheduler_queue_entry *qe)
 	return ret;
 }
 
+int i915_scheduler_handle_IRQ(struct intel_engine_cs *ring)
+{
+	struct drm_i915_private *dev_priv = ring->dev->dev_private;
+
+	/* Do stuff... */
+
+	queue_work(dev_priv->wq, &dev_priv->mm.scheduler_work);
+
+	return 0;
+}
+
 int i915_scheduler_remove(struct intel_engine_cs *ring)
 {
 	/* Do stuff... */
@@ -149,4 +160,9 @@ int i915_scheduler_queue_execbuffer(struct i915_scheduler_queue_entry *qe)
 	return i915_gem_do_execbuffer_final(&qe->params);
 }
 
+int i915_scheduler_handle_IRQ(struct intel_engine_cs *ring)
+{
+	return 0;
+}
+
 #endif  /* CONFIG_DRM_I915_SCHEDULER */
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index e62254a..dd7d699 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -62,6 +62,7 @@ int         i915_scheduler_init(struct drm_device *dev);
 int         i915_scheduler_closefile(struct drm_device *dev,
 				     struct drm_file *file);
 int         i915_scheduler_queue_execbuffer(struct i915_scheduler_queue_entry *qe);
+int         i915_scheduler_handle_IRQ(struct intel_engine_cs *ring);
 
 #ifdef CONFIG_DRM_I915_SCHEDULER
 
-- 
1.7.9.5