Hello,

Please note that, this specific commit causes a regression in kernels older than 6.9.y, it is only needed after "cpufreq: amd-pstate: Unify computation of {max,min,nominal,lowest_nonlinear}_freq" got merged, so please do not port it back to kernels older than that.

Thanks, Dhananjay

On 7/27/2024 8:08 PM, Sasha Levin wrote:

This is a note to let you know that I've just added the patch titled

cpufreq/amd-pstate-ut: Convert nominal_freq to khz during comparisons

to the 6.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: cpufreq-amd-pstate-ut-convert-nominal_freq-to-khz-du.patch and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

commit ac333983a0338e3009be4d5a59af25fb2da7130c Author: Dhananjay Ugwekar Dhananjay.Ugwekar@amd.com Date: Tue Jul 2 08:14:13 2024 +0000

cpufreq/amd-pstate-ut: Convert nominal_freq to khz during comparisons

[ Upstream commit f21ab5ed4e8758b06230900f44b9dcbcfdc0c3ae ] cpudata->nominal_freq being in MHz whereas other frequencies being in KHz breaks the amd-pstate-ut frequency sanity check. This fixes it. Fixes: e4731baaf294 ("cpufreq: amd-pstate: Fix the inconsistency in max frequency units") Reported-by: David Arcari darcari@redhat.com Signed-off-by: Dhananjay Ugwekar Dhananjay.Ugwekar@amd.com Reviewed-by: Mario Limonciello mario.limonciello@amd.com Reviewed-by: Gautham R. Shenoy gautham.shenoy@amd.com Link: https://lore.kernel.org/r/20240702081413.5688-2-Dhananjay.Ugwekar@amd.com Signed-off-by: Mario Limonciello mario.limonciello@amd.com Signed-off-by: Sasha Levin sashal@kernel.org

diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-ut.c index f04ae67dda372..f5e0151f50083 100644 --- a/drivers/cpufreq/amd-pstate-ut.c +++ b/drivers/cpufreq/amd-pstate-ut.c @@ -201,6 +201,7 @@ 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); @@ -208,13 +209,14 @@ 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;
  

  }

@@ -228,13 +230,13 @@ 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 {