From: Ben Widawsky <ben@bwidawsk.net>
Date: Thu, 1 Aug 2013 00:00:08 +0000 (-0700)
Subject: drm/i915: Improve VMA comments
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0b02e798ffec99b51f2fe931ceb61ca0d22d2a70;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

drm/i915: Improve VMA comments

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 290c12dd6e6b..4f93467fdfdd 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/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 {