linux-kernel - Re: [PATCH v2 1/2] cpufreq: Allow drivers to advertise boost enabled

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Date: Mon, 1 Jul 2024 18:15:40 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Mario Limonciello <mario.limonciello@....com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Sibi Sankar <quic_sibis@...cinc.com>, 
	Dhruva Gole <d-gole@...com>, Viresh Kumar <viresh.kumar@...aro.org>, 
	"Gautham R . Shenoy" <gautham.shenoy@....com>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Yipeng Zou <zouyipeng@...wei.com>, "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v2 1/2] cpufreq: Allow drivers to advertise boost enabled

On Thu, Jun 27, 2024 at 9:12 PM Mario Limonciello
<mario.limonciello@....com> wrote:
>
> On 6/27/2024 04:59, Rafael J. Wysocki wrote:
> > On Wed, Jun 26, 2024 at 10:47 PM Mario Limonciello
> > <mario.limonciello@....com> wrote:
> >>
> >> The behavior introduced in commit f37a4d6b4a2c ("cpufreq: Fix per-policy
> >> boost behavior on SoCs using cpufreq_boost_set_sw()") sets up the boost
> >> policy incorrectly when boost has been enabled by the platform firmware
> >> initially even if a driver sets the policy up.
> >>
> >> This is because policy_has_boost_freq() assumes that there is a frequency
> >> table set up by the driver and that the boost frequencies are advertised
> >> in that table. This assumption doesn't work for acpi-cpufreq or
> >> amd-pstate. Only use this check to enable boost if it's not already
> >> enabled instead of also disabling it if alreayd enabled.
> >>
> >> Reviewed-by: Sibi Sankar <quic_sibis@...cinc.com>
> >> Reviewed-by: Dhruva Gole <d-gole@...com>
> >> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> >> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
> >> Fixes: f37a4d6b4a2c ("cpufreq: Fix per-policy boost behavior on SoCs using cpufreq_boost_set_sw()")
> >
> > CC: stable I suppose?
>
> Yes, I didn't realize f37a4d6b4a2c came in 6.9, I had assumed it was
> 6.10.  But since it's 6.9, yes if you can please add stable tag when
> committing.

Applied as 6.10-rc material along with the [2/2].

I've added a Fixes: tag to the second patch and "Cc: stable" tags to
both patches.

Thanks!

> >
> >> Suggested-by: Viresh Kumar <viresh.kumar@...aro.org>
> >> Suggested-by: Gautham R. Shenoy <gautham.shenoy@....com>
> >> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> >> ---
> >> Cc: Sibi Sankar <quic_sibis@...cinc.com>
> >> Cc: Dietmar Eggemann <dietmar.eggemann@....com>
> >> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> >> Cc: Dhruva Gole <d-gole@...com>
> >> Cc: Yipeng Zou <zouyipeng@...wei.com>
> >> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >> v1->v2
> >>   * Pick up tags
> >> ---
> >>   drivers/cpufreq/cpufreq.c | 3 ++-
> >>   1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> >> index 1fdabb660231..270ea04fb616 100644
> >> --- a/drivers/cpufreq/cpufreq.c
> >> +++ b/drivers/cpufreq/cpufreq.c
> >> @@ -1430,7 +1430,8 @@ static int cpufreq_online(unsigned int cpu)
> >>                  }
> >>
> >>                  /* Let the per-policy boost flag mirror the cpufreq_driver boost during init */
> >> -               policy->boost_enabled = cpufreq_boost_enabled() && policy_has_boost_freq(policy);
> >> +               if (cpufreq_boost_enabled() && policy_has_boost_freq(policy))
> >> +                       policy->boost_enabled = true;
> >>
> >>                  /*
> >>                   * The initialization has succeeded and the policy is online.
> >> --
>