[PATCH] drm/ttm: do not try to preserve caching state

[Thomas Hellstrom]

On 11/28/2012 09:09 PM, Jerome Glisse wrote:
> On Wed, Nov 28, 2012 at 10:05 AM,  <j.glisse at gmail.com> wrote:
>> From: Jerome Glisse <jglisse at redhat.com>
>>
>> It make no sense to preserve caching state especialy when
>> moving from vram to system. It burden the page allocator to
>> match the vram caching (often WC) which just burn CPU cycle
>> for no good reasons.

Nack.
This is a driver problem.

What happens with this patch if you evict write-combined TT memory to 
system?
That's why we want to preserve caching state in the first place.

If you need a different behavior, you can fine-tune in 
driver::evict_flags, or in the
radeon-case in radeon_move_ram_vram / radeon_move_vram_ram.

/Thomas