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drm/i915: Improve VMA comments

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Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-07-31 17:00:08 -07:00 • committed by Daniel Vetter
commit 0b02e798ff
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/i915/i915_drv.h
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@ -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 {