[Intel-gfx] [PATCH 8/8] drm/i915: Allow user to set cache at BO creation

[Tvrtko Ursulin]

On 20/04/2023 12:39, Andi Shyti wrote:
> Hi Fei,
> 
>> To comply with the design that buffer objects shall have immutable
>> cache setting through out their life cycle, {set, get}_caching ioctl's
>> are no longer supported from MTL onward. With that change caching
>> policy can only be set at object creation time. The current code
>> applies a default (platform dependent) cache setting for all objects.
>> However this is not optimal for performance tuning. The patch extends
>> the existing gem_create uAPI to let user set PAT index for the object
>> at creation time.
>> The new extension is platform independent, so UMD's can switch to using
>> this extension for older platforms as well, while {set, get}_caching are
>> still supported on these legacy paltforms for compatibility reason.
>>
>> Cc: Chris Wilson <chris.p.wilson at linux.intel.com>
>> Cc: Matt Roper <matthew.d.roper at intel.com>
>> Cc: Andi Shyti <andi.shyti at linux.intel.com>
>> Signed-off-by: Fei Yang <fei.yang at intel.com>
>> Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>
> 
> because this is an API change, we need some more information
> here.
> 
> First of all you need to CC the userspace guys that have been
> working on top of your series and get their ack's.

Yes, and a link to a Mesa merge request which uses the uapi should be 
included.

IGTs should be ready to before we can merge. I glanced over igt-dev but 
did not spot anything.

Regards,

Tvrtko

> 
> I also believe that this series has also been tested on a
> separate repository, would you link it in the commit message?
> 
> Thanks,
> Andi