Re: [Intel-gfx] [PATCH v6 6/7] drm/i915/gt: Create per-tile RPS sysfs interfaces

[Andrzej Hajda <andrzej.hajda@intel.com>]

On 18.03.2022 03:10, Andi Shyti wrote:
> Now tiles have their own sysfs interfaces under the gt/
> directory. Because RPS is a property that can be configured on a
> tile basis, then each tile should have its own interface
> 
> The new sysfs structure will have a similar layout for the 4 tile
> case:
> 
> /sys/.../card0
>           ├── gt
>           │   ├── gt0
>           │   │   ├── id
>           │   │   ├── rc6_enable
>           │   │   ├── rc6_residency_ms
>           │   │   ├── rps_act_freq_mhz
>           │   │   ├── rps_boost_freq_mhz
>           │   │   ├── rps_cur_freq_mhz
>           │   │   ├── rps_max_freq_mhz
>           │   │   ├── rps_min_freq_mhz
>           │   │   ├── rps_RP0_freq_mhz
>           │   │   ├── rps_RP1_freq_mhz
>           │   │   └── rps_RPn_freq_mhz
>           .   .
>           .   .
>           .   .
>           │   └── gtN
>           │       ├── id
>           │       ├── rc6_enable
>           │       ├── rc6_residency_ms
>           │       ├── rps_act_freq_mhz
>           │       ├── rps_boost_freq_mhz
>           │       ├── rps_cur_freq_mhz
>           │       ├── rps_max_freq_mhz
>           │       ├── rps_min_freq_mhz
>           │       ├── rps_RP0_freq_mhz
>           │       ├── rps_RP1_freq_mhz
>           │       └── rps_RPn_freq_mhz
>           ├── gt_act_freq_mhz   -+
>           ├── gt_boost_freq_mhz  |
>           ├── gt_cur_freq_mhz    |    Original interface
>           ├── gt_max_freq_mhz    +─-> kept as existing ABI;
>           ├── gt_min_freq_mhz    |    it points to gt0/
>           ├── gt_RP0_freq_mhz    |
>           ├── gt_RP1_freq_mhz    |
>           └── gt_RPn_freq_mhz   -+
> 
> The existing interfaces have been kept in their original location
> to preserve the existing ABI. They act on all the GTs: when
> writing they loop through all the GTs and write the information
> on each interface. When reading they provide the average value
> from all the GTs.
> 
> This patch is not really adding exposing new interfaces (new
> ABI) other than adapting the existing one to more tiles. In any
> case this new set of interfaces will be a basic tool for system
> managers and administrators when using i915.
> 
> Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
> Cc: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> ---

Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>

Regards
Andrzej