[Intel-gfx] [PATCH v17 1/4] drm/i915: Introduce private PAT management

[Joonas Lahtinen]

On Thu, 2017-09-14 at 20:39 +0800, Zhi Wang wrote:
> The private PAT management is to support PPAT entry manipulation. Two
> APIs are introduced for dynamically managing PPAT entries: intel_ppat_get
> and intel_ppat_put.
> 
> intel_ppat_get will search for an existing PPAT entry which perfectly
> matches the required PPAT value. If not, it will try to allocate a new
> entry if there is any available PPAT indexs, or return a partially
> matched PPAT entry if there is no available PPAT indexes.
> 
> intel_ppat_put will put back the PPAT entry which comes from
> intel_ppat_get. If it's dynamically allocated, the reference count will
> be decreased. If the reference count turns into zero, the PPAT index is
> freed again.
> 
> Besides, another two callbacks are introduced to support the private PAT
> management framework. One is ppat->update_hw(), which writes the PPAT
> configurations in ppat->entries into HW. Another one is ppat->match, which
> will return a score to show how two PPAT values match with each other.
> 

I manually fixed the enum to use BIT() and merged the first two patches
of the series. The third should go in with the kselftests.

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation