linux-kernel - Re: [PATCH v3 02/18] cpufreq/amd-pstate: Show a warning when a CPU fails to setup

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Message-ID: <0729eed3-4034-4744-baf3-ddee54be1f7f@amd.com>
Date: Wed, 19 Feb 2025 11:44:36 +0530
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
To: Mario Limonciello <superm1@...nel.org>,
 "Gautham R . Shenoy" <gautham.shenoy@....com>,
 Perry Yuan <perry.yuan@....com>
Cc: "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
 <linux-kernel@...r.kernel.org>,
 "open list:CPU FREQUENCY SCALING FRAMEWORK" <linux-pm@...r.kernel.org>,
 Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH v3 02/18] cpufreq/amd-pstate: Show a warning when a CPU
 fails to setup

On 2/18/2025 3:36 AM, Mario Limonciello wrote:
> From: Mario Limonciello <mario.limonciello@....com>
> 
> I came across a system that MSR_AMD_CPPC_CAP1 for some CPUs isn't
> populated.  This is an unexpected behavior that is most likely a
> BIOS bug. In the event it happens I'd like users to report bugs
> to properly root cause and get this fixed.
> 
> Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>

Reviewed-by: Dhananjay Ugwekar <dhananjay.ugwekar@....com>

> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>  drivers/cpufreq/amd-pstate.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 12fb63169a24c..87c605348a3dc 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -1034,6 +1034,7 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
>  free_cpudata2:
>  	freq_qos_remove_request(&cpudata->req[0]);
>  free_cpudata1:
> +	pr_warn("Failed to initialize CPU %d: %d\n", policy->cpu, ret);
>  	kfree(cpudata);
>  	return ret;
>  }
> @@ -1527,6 +1528,7 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
>  	return 0;
>  
>  free_cpudata1:
> +	pr_warn("Failed to initialize CPU %d: %d\n", policy->cpu, ret);
>  	kfree(cpudata);
>  	return ret;
>  }