linux-kernel - Re: [PATCH v5 7/7] cpufreq: amd-pstate: add ACPI disabled check in acpi_cpc

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Date:   Thu, 25 Aug 2022 13:56:52 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Perry Yuan <Perry.Yuan@....com>
Cc:     Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Huang Rui <ray.huang@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Deepak Sharma <Deepak.Sharma@....com>,
        Mario Limonciello <Mario.Limonciello@....com>,
        Nathan Fontenot <Nathan.Fontenot@....com>,
        Alex Deucher <Alexander.Deucher@....com>,
        "Su, Jinzhou (Joe)" <Jinzhou.Su@....com>, Shimmer.Huang@....com,
        "Du, Xiaojian" <Xiaojian.Du@....com>,
        "Meng, Li (Jassmine)" <Li.Meng@....com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 7/7] cpufreq: amd-pstate: add ACPI disabled check in acpi_cpc_valid()

On Sun, Aug 14, 2022 at 6:53 PM Perry Yuan <Perry.Yuan@....com> wrote:
>
> Add acpi function check in case ACPI is not enabled, that will cause
> pstate driver failed to call cppc acpi to change perf or update epp
> value for shared memory solution processors.
>
> When CPPC or ACPI is invalid, warning log will be needed to tell
> user that AMD pstate driver failed to load and what is wrong.
>
> Signed-off-by: Perry Yuan <Perry.Yuan@....com>
> ---
>  drivers/acpi/cppc_acpi.c       | 3 +++
>  drivers/base/arch_topology.c   | 2 +-
>  drivers/cpufreq/amd-pstate.c   | 2 +-
>  drivers/cpufreq/cppc_cpufreq.c | 2 +-
>  4 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
> index 1e15a9f25ae9..c2309429146f 100644
> --- a/drivers/acpi/cppc_acpi.c
> +++ b/drivers/acpi/cppc_acpi.c
> @@ -424,6 +424,9 @@ bool acpi_cpc_valid(void)
>         struct cpc_desc *cpc_ptr;
>         int cpu;
>
> +       if (acpi_disabled)
> +               return false;
> +
>         for_each_present_cpu(cpu) {
>                 cpc_ptr = per_cpu(cpc_desc_ptr, cpu);
>                 if (!cpc_ptr)
> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
> index 579c851a2bd7..73a8cb31529d 100644
> --- a/drivers/base/arch_topology.c
> +++ b/drivers/base/arch_topology.c
> @@ -352,7 +352,7 @@ void topology_init_cpu_capacity_cppc(void)
>         struct cppc_perf_caps perf_caps;
>         int cpu;
>
> -       if (likely(acpi_disabled || !acpi_cpc_valid()))
> +       if (likely(!acpi_cpc_valid()))
>                 return;
>
>         raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity),
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 9cb051d61422..96e4ecddf3f6 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -661,7 +661,7 @@ static int __init amd_pstate_init(void)
>                 return -ENODEV;
>
>         if (!acpi_cpc_valid()) {
> -               pr_debug("the _CPC object is not present in SBIOS\n");
> +               pr_warn_once("the _CPC object is not present in SBIOS or ACPI disabled\n");
>                 return -ENODEV;
>         }
>
> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
> index 24eaf0ec344d..9adb7612993e 100644
> --- a/drivers/cpufreq/cppc_cpufreq.c
> +++ b/drivers/cpufreq/cppc_cpufreq.c
> @@ -947,7 +947,7 @@ static int __init cppc_cpufreq_init(void)
>  {
>         int ret;
>
> -       if ((acpi_disabled) || !acpi_cpc_valid())
> +       if (!acpi_cpc_valid())
>                 return -ENODEV;
>
>         cppc_check_hisi_workaround();
> --

Applied as 6.1 material with modified subject and changelog, thanks!