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drm/i915: GEM operations need to be done under the big lock 

VMA creation and GEM list management need the big lock.

v2:

Mutex unlock ended on the wrong path somehow. (0-day, Julia Lawall)

Not to mention drm_gem_object_unreference was there in existing
code with no mutex held.

v3:

Some callers of i915_gem_object_create_stolen_for_preallocated
already hold the lock so move the mutex into the other caller
as well.

v4:

Changed to lockdep_assert_held. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Tvrtko Ursulin 2016-02-11 10:27:29 +00:00
parent 3f441b825d
commit 12c83d9943
2 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/i915_gem_stolen.c
View File

@ -638,6 +638,8 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
if (!drm_mm_initialized(&dev_priv->mm.stolen))
return NULL;
lockdep_assert_held(&dev->struct_mutex);
DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x, gtt_offset=%x, size=%x\n",
stolen_offset, gtt_offset, size);

8
drivers/gpu/drm/i915/intel_display.c
View File

@ -2551,12 +2551,16 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
if (size_aligned * 2 > dev_priv->gtt.stolen_usable_size)
return false;
mutex_lock(&dev->struct_mutex);
obj = i915_gem_object_create_stolen_for_preallocated(dev,
base_aligned,
base_aligned,
size_aligned);
if (!obj)
if (!obj) {
mutex_unlock(&dev->struct_mutex);
return false;
}
obj->tiling_mode = plane_config->tiling;
if (obj->tiling_mode == I915_TILING_X)
@ -2569,12 +2573,12 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
mode_cmd.modifier[0] = fb->modifier[0];
mode_cmd.flags = DRM_MODE_FB_MODIFIERS;
mutex_lock(&dev->struct_mutex);
if (intel_framebuffer_init(dev, to_intel_framebuffer(fb),
&mode_cmd, obj)) {
DRM_DEBUG_KMS("intel fb init failed\n");
goto out_unref_obj;
}
mutex_unlock(&dev->struct_mutex);
DRM_DEBUG_KMS("initial plane fb obj %p\n", obj);