drm/i915: fix module unload after context merge
commit 8e96d9c4d9843f00ebeb4a9b33596d96602ea101
Author: Ben Widawsky <ben@bwidawsk.net>
Date: Mon Jun 4 14:42:56 2012 -0700
drm/i915: reset the GPU on context fini
broke module unload because it reset the gpu before we've stopped
touching it. Later on in the unload sequence the ringbuffer code
complained that the gpu would idle properly (because intel_gpu_reset
only resets the hw and not our sw state).
v2: Reorder things so that we reset the gpu _before_ we release the
backing storage of the default context.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=51183
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index ba75af1..9913a77 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1669,7 +1669,6 @@
if (ret)
DRM_ERROR("failed to idle hardware: %d\n", ret);
i915_gem_retire_requests(dev);
- i915_gem_context_fini(dev);
mutex_unlock(&dev->struct_mutex);
/* Cancel the retire work handler, which should be idle now. */
@@ -1720,6 +1719,7 @@
mutex_lock(&dev->struct_mutex);
i915_gem_free_all_phys_object(dev);
i915_gem_cleanup_ringbuffer(dev);
+ i915_gem_context_fini(dev);
mutex_unlock(&dev->struct_mutex);
i915_gem_cleanup_aliasing_ppgtt(dev);
i915_gem_cleanup_stolen(dev);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 8fb8cd8..48e41df 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -277,11 +277,14 @@
if (dev_priv->hw_contexts_disabled)
return;
+ /* 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);
+
i915_gem_object_unpin(dev_priv->ring[RCS].default_context->obj);
do_destroy(dev_priv->ring[RCS].default_context);
-
- intel_gpu_reset(dev);
}
void i915_gem_context_open(struct drm_device *dev, struct drm_file *file)