[Intel-gfx] [RFCv2 2/3] drm/i915: Introduce private PAT management

[Chris Wilson]

Quoting Zhi Wang (2017-08-23 02:44:12)
> The private PAT management is to support both static and dynamic PPAT
> entry manipulation. During the initialization, the PPAT indexes with
> specific PPAT values could be reserved and set by intel_ppat_reserve.
> The unused PPAT entries can be allocated/freed later at runtime. Two
> APIs are introduced for dynamically managing PPAT entries: intel_ppat_get
> and intel_ppat_set.

What's the use case for reserved? Once assigned, a new allocation
doesn't evict, so reservation is just another form of assignment.
-Chris