drm/i915: Allow user to set cache at BO creation

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.
However, since PAT index was not clearly defined for platforms prior to
GEN12 (TGL), so we are limiting this externsion to GEN12+ platforms
only. See ext_set_pat() in for the implementation details.

The documentation related to the PAT/MOCS tables is currently available
for Tiger Lake here:
https://www.intel.com/content/www/us/en/docs/graphics-for-linux/developer-reference/1-0/tiger-lake.html

The documentation for other platforms is currently being updated.

BSpec: 45101

Mesa support has been submitted in this merge request:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22878

The media driver supprt has bin submitted in this merge request:
https://github.com/intel/media-driver/pull/1680

The IGT test related to this change is
igt@gem_create@create-ext-set-pat

Signed-off-by: Fei Yang <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: Andi Shyti <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Acked-by: Jordan Justen <[email protected]>
Tested-by: Jordan Justen <[email protected]>
Acked-by: Carl Zhang <[email protected]>
Tested-by: Lihao Gu <[email protected]>
Signed-off-by: Andi Shyti <[email protected]>
Acked-by: Tvrtko Ursulin <[email protected]>
Acked-by: Slawomir Milczarek <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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