[Intel-gfx] [CI 2/2] drm/i915: Introduce DRM_I915_GEM_MMAP_OFFSET

[Chris Wilson]

Quoting Chris Wilson (2019-11-28 14:52:11)
> From: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> 
> This is really just an alias of mmap_gtt. The 'mmap offset' nomenclature
> comes from the value returned by this ioctl which is the offset into the
> device fd which userpace uses with mmap(2).
> 
> mmap_gtt was our initial mmap_offset implementation, this extends
> our CPU mmap support to allow additional fault handlers that depends on
> the object's backing pages.
> 
> Note that we multiplex mmap_gtt and mmap_offset through the same ioctl,
> and use the zero extending behaviour of drm to differentiate between
> them, when we inspect the flags.
> 
> v2:
> - Drop the alias, just rename the struct (Chris)
> - Don't bail out on no PAT when doing WB mmaps
> - Prepare uAPI for further extensions
> v3:
> - drop MMAP_OFFSET_FLAGS
> v4:
> - Tweaks, header re-org
> 
> Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

Sigh, ignore this. This patch is not standalone.
-Chris