[Intel-gfx] [PATCH 5/7] drm/i915/vlv: Increase the utilization of stolen memory on VLV.

[Chris Wilson]

On Thu, Jan 09, 2014 at 11:01:02AM +0530, akash.goel at intel.com wrote:
> From: Akash Goel <akash.goel at intel.com>
> 
> On VLV, 64MB of system memory was being reserved for stolen
> area, but ~8MB of it was being utilized.
> Increased the utilization of Stolen area by allocating
> User created Frame buffers(only X Tiled) from it.
> User Frame buffers are suitable for allocation from stolen area,
> as its very unlikely that they are not accessed from CPU side.
> And its even more unlikely that the Tiled(X) buffers will be
> accessed directly from the CPU side. And any allocation
> from stolen area is not directly CPU accessible, but
> accessible only through the aperture space.
> With 1080p sized frame buffers (32 bpp), the allocation of 6-7
> frame buffers itself gives almost the full utilization of
> stolen area.

This completely breaks the ABI. Nak.

See the create2 ioctl.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre