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drm/i915: Improve VMA comments

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Ben Widawsky 12 years ago
parent
commit
0b02e798ff
1 changed files with 6 additions and 1 deletions
  1. 6 1
      drivers/gpu/drm/i915/i915_drv.h

+ 6 - 1
drivers/gpu/drm/i915/i915_drv.h

@@ -545,7 +545,12 @@ struct i915_hw_ppgtt {
 	int (*enable)(struct drm_device *dev);
 };
 
-/* To make things as simple as possible (ie. no refcounting), a VMA's lifetime
+/**
+ * A VMA represents a GEM BO that is bound into an address space. Therefore, a
+ * VMA's presence cannot be guaranteed before binding, or after unbinding the
+ * object into/from the address space.
+ *
+ * To make things as simple as possible (ie. no refcounting), a VMA's lifetime
  * will always be <= an objects lifetime. So object refcounting should cover us.
  */
 struct i915_vma {