[PATCH 08/12] drm/i915: Update context_fini

[Ben Widawsky <ben@bwidawsk.net>]

Make resets optional for fini. fini is only ever called in
module_unload. It was therefore a good assumption that the GPU reset
(see the comment in the function) was what we wanted. With an upcoming
patch, we're going to add a few more callsites, one of which is GPU
reset, where doing the extra reset isn't usual.

On that same note, with more callers it makes sense to make the default
context state consistent with the actual state (via NULLing the
pointer).

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_dma.c         | 2 +-
 drivers/gpu/drm/i915/i915_drv.h         | 2 +-
 drivers/gpu/drm/i915/i915_gem_context.c | 7 +++++--
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 3b315ba..a141b8a 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1764,7 +1764,7 @@ int i915_driver_unload(struct drm_device *dev)
 		mutex_lock(&dev->struct_mutex);
 		i915_gem_free_all_phys_object(dev);
 		i915_gem_cleanup_ringbuffer(dev);
-		i915_gem_context_fini(dev);
+		i915_gem_context_fini(dev, true);
 		mutex_unlock(&dev->struct_mutex);
 		i915_gem_cleanup_aliasing_ppgtt(dev);
 		i915_gem_cleanup_stolen(dev);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 9717c69..618845e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1698,7 +1698,7 @@ struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
 
 /* i915_gem_context.c */
 void i915_gem_context_init(struct drm_device *dev);
-void i915_gem_context_fini(struct drm_device *dev);
+void i915_gem_context_fini(struct drm_device *dev, bool reset);
 void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
 int i915_switch_context(struct intel_ring_buffer *ring,
 			struct drm_file *file, int to_id);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 411ace0..6030d83 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -259,7 +259,7 @@ void i915_gem_context_init(struct drm_device *dev)
 	DRM_DEBUG_DRIVER("HW context support initialized\n");
 }
 
-void i915_gem_context_fini(struct drm_device *dev)
+void i915_gem_context_fini(struct drm_device *dev, bool reset)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
@@ -269,11 +269,14 @@ void i915_gem_context_fini(struct drm_device *dev)
 	/* The only known way to stop the gpu from accessing the hw context is
 	 * to reset it. Do this as the very last operation to avoid confusing
 	 * other code, leading to spurious errors. */
-	intel_gpu_reset(dev);
+	if (reset)
+		intel_gpu_reset(dev);
 
 	i915_gem_object_unpin(dev_priv->ring[RCS].default_context->obj);
 
 	do_destroy(dev_priv->ring[RCS].default_context);
+
+	dev_priv->ring[RCS].default_context = NULL;
 }
 
 static int context_idr_cleanup(int id, void *p, void *data)
-- 
1.8.2.1