[Intel-gfx] [PATCH 01/03] drm/i915: add a context parameter to {en, dis}able zero address mapping

[Chris Wilson]

On Wed, May 20, 2015 at 05:00:13PM +0300, David Weinehall wrote:
> Export a new context parameter that can be set/queried through the
> context_{get,set}param ioctls.  This parameter is passed as a context
> flag and decides whether or not a GPU address mapping is allowed to
> be made at address zero.  The default is to allow such mappings.

Please revert this piece of unreviewed API.

The most obvious objection is what value of bias the kernel should be
using.

Then given that what value does this hold over and above userspace
specifying the layout they want?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre