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

[Wang, Zhi A]

Thanks for that. :) Have a nice day. :)

-----Original Message-----
From: Joonas Lahtinen [mailto:joonas.lahtinen at linux.intel.com] 
Sent: Thursday, September 14, 2017 4:48 PM
To: Wang, Zhi A <zhi.a.wang at intel.com>; intel-gfx at lists.freedesktop.org; intel-gvt-dev at lists.freedesktop.org
Cc: chris at chris-wilson.co.uk; zhenyuw at linux.intel.com; Widawsky, Benjamin <benjamin.widawsky at intel.com>; Vivi, Rodrigo <rodrigo.vivi at intel.com>
Subject: Re: [PATCH v17 1/4] drm/i915: Introduce private PAT management

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