[Intel-gfx] [RFC 13/44] drm/i915: Added scheduler hook when closing DRM file handles

[John.C.Harrison at Intel.com]

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

The scheduler decouples the submission of batch buffers to the driver with
submission of batch buffers to the hardware. Thus it is possible for an
application to submit work, then close the DRM handle and free up all the
resources that piece of work wishes to use before the work has even been
submitted to the hardware. To prevent this, the scheduler needs to be informed
of the DRM close event so that it can force through any outstanding work
attributed to that file handle.
---
 drivers/gpu/drm/i915/i915_dma.c       |    3 +++
 drivers/gpu/drm/i915/i915_scheduler.c |   18 ++++++++++++++++++
 drivers/gpu/drm/i915/i915_scheduler.h |    2 ++
 3 files changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 494b156..6c9ce82 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -42,6 +42,7 @@
 #include <linux/vga_switcheroo.h>
 #include <linux/slab.h>
 #include <acpi/video.h>
+#include "i915_scheduler.h"
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/oom.h>
@@ -1930,6 +1931,8 @@ void i915_driver_lastclose(struct drm_device * dev)
 
 void i915_driver_preclose(struct drm_device *dev, struct drm_file *file)
 {
+	i915_scheduler_closefile(dev, file);
+
 	mutex_lock(&dev->struct_mutex);
 	i915_gem_context_close(dev, file);
 	i915_gem_release(dev, file);
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index d9c1879..66a6568 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -78,6 +78,19 @@ bool i915_scheduler_is_seqno_in_flight(struct intel_engine_cs *ring,
 	return found;
 }
 
+int i915_scheduler_closefile(struct drm_device *dev, struct drm_file *file)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_scheduler   *scheduler = dev_priv->scheduler;
+
+	if (!scheduler)
+		return 0;
+
+	/* Do stuff... */
+
+	return 0;
+}
+
 #else   /* CONFIG_DRM_I915_SCHEDULER */
 
 int i915_scheduler_init(struct drm_device *dev)
@@ -85,4 +98,9 @@ int i915_scheduler_init(struct drm_device *dev)
 	return 0;
 }
 
+int i915_scheduler_closefile(struct drm_device *dev, struct drm_file *file)
+{
+	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 4044b6e..95641f6 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -27,6 +27,8 @@
 
 bool        i915_scheduler_is_enabled(struct drm_device *dev);
 int         i915_scheduler_init(struct drm_device *dev);
+int         i915_scheduler_closefile(struct drm_device *dev,
+				     struct drm_file *file);
 
 #ifdef CONFIG_DRM_I915_SCHEDULER
 
-- 
1.7.9.5