[Mesa-dev] [PATCH 2/2] i965/hsw: Set MOCS to L3_CACHEABLE for some packets

[Chad Versace]

On 07/17/2013 02:42 PM, Chris Wilson wrote:
> On Wed, Jul 17, 2013 at 02:28:55PM -0700, Chad Versace wrote:
>> Set MOCS to L3_CACHEABLE for the following packets, during the normal
>> draw upload path and during blorp:
>>      SURFACE_STATE
>>      3DSTATE_DEPTH_BUFFER
>>      3DSTATE_HIER_DEPTH_BUFFER
>>      3DSTATE_STENCIL_BUFFER
>>
>> It's not possible to set the MOCS of the MCS buffer, because the MCS
>> inherits MOCS from the parent surface.


> Do you not have to worry about scanout coherency (e.g. frontbuffer
> rendering)?

I forgot about that. We also may need to worry about the case where
the compositor un-redirects the fullscreen client.

I don't how to detect if the color buffer is the scanout buffer. And,
given that the compositor may un-redirect the client when fullscreen,
I wouldn't trust any half-baked ideas I have on how to do that detection.
Any advice?

I wish the hardware were magical and would ignore the MOCS for the
scanout buffer, but I haven't found that magic in the hw docs.