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

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Date: Wed, 26 Jun 2024 13:32:34 +0530
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
To: Mario Limonciello <mario.limonciello@....com>, rafael@...nel.org,
 viresh.kumar@...aro.org, gautham.shenoy@....com, perry.yuan@....com,
 skhan@...uxfoundation.org, li.meng@....com, 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

Hello Mario,

On 6/25/2024 8:35 PM, Mario Limonciello wrote:
> On 6/25/2024 08:41, 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>
> 
> The code change below looks fine to me, but I think the tag is wrong. It should go with the "fix" that caused the inconsistency.  Here is what
> I think the correct tag should be:
> 
> Fixes: e4731baaf294 ("cpufreq: amd-pstate: Fix the inconsistency in max frequency units")

Makes sense, will update the tag.

Thanks for reviewing!

Regards,
Dhananjay

> 
> Reviewed-by: Mario Limonciello <mario.limonciello@....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 {
>