Re: [PATCH 11/19] cpufreq: amd: add amd-pstate performance attributes

Fontenot, Nathan
2021-09-08T18:21:05Z

On 9/8/2021 9:59 AM, Huang Rui wrote:
> Introduce sysfs attributes to get the different level amd-pstate
> performances.
>
> Signed-off-by: Huang Rui <ray.huang@amd.com>
> ---
> drivers/cpufreq/amd-pstate.c | 66 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 66 insertions(+)
>
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index 3c727a22cb69..9c60388d45ed 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -647,6 +647,62 @@ static ssize_t show_amd_pstate_min_freq(struct cpufreq_policy *policy, char *buf
> return ret;
> }
>
> +static ssize_t
> +show_amd_pstate_highest_perf(struct cpufreq_policy *policy, char *buf)

Here (and in the other functions) the function return value and name should
be on the same line.

> +{
> + int ret = 0;
> + u32 perf;
> + struct amd_cpudata *cpudata = policy->driver_data;
> +
> + perf = READ_ONCE(cpudata->highest_perf);
> +
> + ret += sprintf(&buf[ret], "%u\n", perf);
> +
> + return ret;

Same comment as the previous patch here and in the functions below, just do

return sprintf(&buf[ret], "%u\n", perf);

and get rid of the intermediary 'ret' variable.

-Nathan

> +}
> +
> +static ssize_t
> +show_amd_pstate_nominal_perf(struct cpufreq_policy *policy, char *buf)
> +{
> + int ret = 0;
> + u32 perf;
> + struct amd_cpudata *cpudata = policy->driver_data;
> +
> + perf = READ_ONCE(cpudata->nominal_perf);
> +
> + ret += sprintf(&buf[ret], "%u\n", perf);
> +
> + return ret;
> +}
> +
> +static ssize_t
> +show_amd_pstate_lowest_nonlinear_perf(struct cpufreq_policy *policy, char *buf)
> +{
> + int ret = 0;
> + u32 perf;
> + struct amd_cpudata *cpudata = policy->driver_data;
> +
> + perf = READ_ONCE(cpudata->lowest_nonlinear_perf);
> +
> + ret += sprintf(&buf[ret], "%u\n", perf);
> +
> + return ret;
> +}
> +
> +static ssize_t
> +show_amd_pstate_lowest_perf(struct cpufreq_policy *policy, char *buf)
> +{
> + int ret = 0;
> + u32 perf;
> + struct amd_cpudata *cpudata = policy->driver_data;
> +
> + perf = READ_ONCE(cpudata->lowest_perf);
> +
> + ret += sprintf(&buf[ret], "%u\n", perf);
> +
> + return ret;
> +}
> +
> static ssize_t show_is_amd_pstate_enabled(struct cpufreq_policy *policy,
> char *buf)
> {
> @@ -654,17 +710,27 @@ static ssize_t show_is_amd_pstate_enabled(struct cpufreq_policy *policy,
> }
>
> cpufreq_freq_attr_ro(is_amd_pstate_enabled);
> +
> cpufreq_freq_attr_ro(amd_pstate_max_freq);
> cpufreq_freq_attr_ro(amd_pstate_nominal_freq);
> cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
> cpufreq_freq_attr_ro(amd_pstate_min_freq);
>
> +cpufreq_freq_attr_ro(amd_pstate_highest_perf);
> +cpufreq_freq_attr_ro(amd_pstate_nominal_perf);
> +cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_perf);
> +cpufreq_freq_attr_ro(amd_pstate_lowest_perf);
> +
> static struct freq_attr *amd_pstate_attr[] = {
> &is_amd_pstate_enabled,
> &amd_pstate_max_freq,
> &amd_pstate_nominal_freq,
> &amd_pstate_lowest_nonlinear_freq,
> &amd_pstate_min_freq,
> + &amd_pstate_highest_perf,
> + &amd_pstate_nominal_perf,
> + &amd_pstate_lowest_nonlinear_perf,
> + &amd_pstate_lowest_perf,
> NULL,
> };
>
> --
> 2.25.1
>