[Intel-gfx] [PATCH 4/7] drm/i915: Cache LRC state page in the context

[Chris Wilson]

On Mon, Jan 11, 2016 at 02:08:38PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> LRC lifetime is well defined so we can cache the page pointing
> to the object backing store in the context in order to avoid
> walking over the object SG page list from the interrupt context
> without the big lock held.

You can keep kmap around for the pinned lifetime of the context.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre