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

[Andi Shyti]

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.

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

Thanks,
Andi