linux-kernel - RE: [PATCH 1/2] cpufreq/amd-pstate-ut: Handle the inconsistency

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Date: Wed, 26 Jun 2024 01:49:58 +0000
From: "Meng, Li (Jassmine)" <Li.Meng@....com>
To: "Ugwekar, Dhananjay" <Dhananjay.Ugwekar@....com>, "rafael@...nel.org"
	<rafael@...nel.org>, "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
	"Shenoy, Gautham Ranjal" <gautham.shenoy@....com>, "Limonciello, Mario"
	<Mario.Limonciello@....com>, "Yuan, Perry" <Perry.Yuan@....com>,
	"skhan@...uxfoundation.org" <skhan@...uxfoundation.org>, "Huang, Ray"
	<Ray.Huang@....com>
CC: "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] cpufreq/amd-pstate-ut: Handle the inconsistency

[AMD Official Use Only - AMD Internal Distribution Only]

Hi Dhananjay:
Sorry for the delay.

I think the correction to this issue should be in function amd_pstae_init_freq() of file amd-pstate.c.
The value of norminal_freq should be consistent with other values(max_freq,min_freq etc.).

> -----Original Message-----
> From: Ugwekar, Dhananjay <Dhananjay.Ugwekar@....com>
> Sent: Tuesday, June 25, 2024 9:52 PM
> To: rafael@...nel.org; viresh.kumar@...aro.org; Shenoy, Gautham Ranjal
> <gautham.shenoy@....com>; Limonciello, Mario
> <Mario.Limonciello@....com>; Yuan, Perry <Perry.Yuan@....com>;
> skhan@...uxfoundation.org; Meng, Li (Jassmine) <Li.Meng@....com>;
> Huang, Ray <Ray.Huang@....com>
> Cc: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 1/2] cpufreq/amd-pstate-ut: Handle the inconsistency
>
> Minor modification, the commit subject is supposed to be
> "cpufreq/amd-pstate-ut: Handle the inconsistency between nominal_freq
> and other *_freq units"
>
> The second half disappeared due to the word wrapping I guess.
>
> Regards,
> Dhananjay
>
> On 6/25/2024 7:11 PM, Dhananjay Ugwekar wrote:
> > cpudata->nominal_freq being in MHz whereas other frequencies being in
> > KHz breaks the amd-pstate-ut frequency sanity check. This fixes it.
> >
> > Fixes: 14eb1c96e3a3 ("cpufreq: amd-pstate: Add test module for
> > amd-pstate driver")
> > Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
> > ---
> >  drivers/cpufreq/amd-pstate-ut.c | 12 +++++++-----
> >  1 file changed, 7 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/cpufreq/amd-pstate-ut.c
> > b/drivers/cpufreq/amd-pstate-ut.c index fc275d41d51e..66b73c308ce6
> > 100644
> > --- a/drivers/cpufreq/amd-pstate-ut.c
> > +++ b/drivers/cpufreq/amd-pstate-ut.c
> > @@ -202,6 +202,7 @@ static void amd_pstate_ut_check_freq(u32 index)
> >     int cpu = 0;
> >     struct cpufreq_policy *policy = NULL;
> >     struct amd_cpudata *cpudata = NULL;
> > +   u32 nominal_freq_khz;
> >
> >     for_each_possible_cpu(cpu) {
> >             policy = cpufreq_cpu_get(cpu);
> > @@ -209,13 +210,14 @@ static void amd_pstate_ut_check_freq(u32 index)
> >                     break;
> >             cpudata = policy->driver_data;
> >
> > -           if (!((cpudata->max_freq >= cpudata->nominal_freq) &&
> > -                   (cpudata->nominal_freq > cpudata-
> >lowest_nonlinear_freq) &&
> > +           nominal_freq_khz = cpudata->nominal_freq*1000;
> > +           if (!((cpudata->max_freq >= nominal_freq_khz) &&
> > +                   (nominal_freq_khz > cpudata-
> >lowest_nonlinear_freq) &&
> >                     (cpudata->lowest_nonlinear_freq > cpudata-
> >min_freq) &&
> >                     (cpudata->min_freq > 0))) {
> >                     amd_pstate_ut_cases[index].result =
> AMD_PSTATE_UT_RESULT_FAIL;
> >                     pr_err("%s cpu%d max=%d >= nominal=%d >
> lowest_nonlinear=%d > min=%d > 0, the formula is incorrect!\n",
> > -                           __func__, cpu, cpudata->max_freq, cpudata-
> >nominal_freq,
> > +                           __func__, cpu, cpudata->max_freq,
> nominal_freq_khz,
> >                             cpudata->lowest_nonlinear_freq, cpudata-
> >min_freq);
> >                     goto skip_test;
> >             }
> > @@ -229,13 +231,13 @@ static void amd_pstate_ut_check_freq(u32 index)
> >
> >             if (cpudata->boost_supported) {
> >                     if ((policy->max == cpudata->max_freq) ||
> > -                                   (policy->max == cpudata-
> >nominal_freq))
> > +                                   (policy->max == nominal_freq_khz))
> >                             amd_pstate_ut_cases[index].result =
> AMD_PSTATE_UT_RESULT_PASS;
> >                     else {
> >                             amd_pstate_ut_cases[index].result =
> AMD_PSTATE_UT_RESULT_FAIL;
> >                             pr_err("%s cpu%d policy_max=%d should be
> equal cpu_max=%d or cpu_nominal=%d !\n",
> >                                     __func__, cpu, policy->max, cpudata-
> >max_freq,
> > -                                   cpudata->nominal_freq);
> > +                                   nominal_freq_khz);
> >                             goto skip_test;
> >                     }
> >             } else {