lkml.org 
[lkml]   [2020]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3 3/3] [RFC] CPUFreq: Add support for cpu-perf-dependencies
On 02-11-20, 12:01, Nicola Mazzucato wrote:
> Hi All,
>
> This is a continuation of the previous v2, where we focused mostly on the
> dt binding.
>
> I am seeking some feedback/comments on the following two approaches.
>
> Intro:
> We have seen that in a system where performance control and hardware
> description do not match (i.e. per-cpu), we still need the information of
> how the v/f lines are shared among the cpus. We call this information
> "performance dependencies".
> We got this info through the opp-shared (the previous 2 patches aim for
> that).
>
> Problem:
> How do we share such info (retrieved from a cpufreq driver) to other
> consumers that rely on it? I have two proposals.

FWIW, we already have a case in kernel where something similar is
done.

commit f4fd3797848a ("acpi-cpufreq: Add new sysfs attribute freqdomain_cpus")

and the information is shared via:

/sys/devices/system/cpu/cpu#/cpufreq/freqdomain_cpus

--
viresh

\
 
 \ /
  Last update: 2020-11-06 10:25    [W:0.137 / U:4.592 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site