Re: [PATCH 01/33] cpufreq: Always create freq-table related sysfs file
From: Rafael J. Wysocki
Date: Thu Jan 23 2025 - 14:39:26 EST
On Thu, Jan 23, 2025 at 12:38 PM Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
>
> Currently it is left for the individual drivers to set the available and
> boost frequencies related attributes in the cpufreq_driver->attr field.
> Some drivers provide them, while others don't.
>
> A quick search revealed that only the drivers that set the
> policy->freq_table field, enable these attributes. Which makes sense as
> well, since the show_available_freqs() helper works only if the
> freq_table is present.
>
> In order to simplify drivers, create the relevant sysfs files forcefully
> from cpufreq core.
>
> For now, skip adding them twice. This can be removed once all the
> drivers are updated.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Acked-by: Rafael J. Wysocki <rafael@xxxxxxxxxx>
> ---
> drivers/cpufreq/cpufreq.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 1a4cae54a01b..973bd6e4bdd4 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -1058,9 +1058,31 @@ static int cpufreq_add_dev_interface(struct cpufreq_policy *policy)
> struct freq_attr **drv_attr;
> int ret = 0;
>
> + /* Attributes that need freq_table */
> + if (policy->freq_table) {
> + ret = sysfs_create_file(&policy->kobj,
> + &cpufreq_freq_attr_scaling_available_freqs.attr);
> + if (ret)
> + return ret;
> +
> + if (cpufreq_boost_supported()) {
> + ret = sysfs_create_file(&policy->kobj,
> + &cpufreq_freq_attr_scaling_boost_freqs.attr);
> + if (ret)
> + return ret;
> + }
> + }
> +
> /* set up files for this cpu device */
> drv_attr = cpufreq_driver->attr;
> while (drv_attr && *drv_attr) {
> + /* These are already added, skip them */
> + if (*drv_attr == &cpufreq_freq_attr_scaling_available_freqs ||
> + *drv_attr == &cpufreq_freq_attr_scaling_boost_freqs) {
> + drv_attr++;
> + continue;
> + }
> +
> ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
> if (ret)
> return ret;
> --
> 2.31.1.272.g89b43f80a514
>