From: "Limonciello, Mario" <mario.limonciello@amd.com>
To: Perry Yuan <Perry.Yuan@amd.com>,
rafael.j.wysocki@intel.com, ray.huang@amd.com,
viresh.kumar@linaro.org
Cc: Deepak.Sharma@amd.com, Nathan.Fontenot@amd.com,
Alexander.Deucher@amd.com, Shimmer.Huang@amd.com,
Xiaojian.Du@amd.com, Li.Meng@amd.com, wyes.karny@amd.com,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode status sysfs entry
Date: Mon, 14 Nov 2022 16:30:11 -0600 [thread overview]
Message-ID: <873c17ad-0a7f-f3a3-0bad-952739d9b394@amd.com> (raw)
In-Reply-To: <20221110175847.3098728-9-Perry.Yuan@amd.com>
On 11/10/2022 11:58, Perry Yuan wrote:
> While amd-pstate driver was loaded with specific driver mode, it will
> need to check which mode is enabled for the pstate driver,add this sysfs
> entry to show the current status
>
> $ cat /sys/devices/system/cpu/amd-pstate/status
> active
>
> Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
> ---
> drivers/cpufreq/amd-pstate.c | 44 ++++++++++++++++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
>
> diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
> index b71bfbbb7639..6a3b610cb084 100644
> --- a/drivers/cpufreq/amd-pstate.c
> +++ b/drivers/cpufreq/amd-pstate.c
> @@ -65,6 +65,8 @@ static int cppc_load __initdata;
> static int epp_off __initdata;
>
> static struct cpufreq_driver *default_pstate_driver;
> +static struct cpufreq_driver amd_pstate_epp_driver;
> +static struct cpufreq_driver amd_pstate_driver;
> static struct amd_cpudata **all_cpu_data;
>
> static struct amd_pstate_params global_params;
> @@ -798,6 +800,46 @@ static ssize_t store_boost(struct kobject *a,
> return count;
> }
>
> +static ssize_t amd_pstate_show_status(char *buf)
> +{
> + if (!default_pstate_driver)
> + return sprintf(buf, "off\n");
> +
> + return sprintf(buf, "%s\n", default_pstate_driver == &amd_pstate_epp_driver ?
> + "active" : "passive");
> +}
For new code I believe you should use the new helper sysfs_emit() instead.
> +
> +static int amd_pstate_update_status(const char *buf, size_t size)
> +{
> + /* FIXME! */
> + return -EOPNOTSUPP;
> +}
> +
> +static ssize_t show_status(struct kobject *kobj,
> + struct kobj_attribute *attr, char *buf)
> +{
> + ssize_t ret;
> +
> + mutex_lock(&amd_pstate_driver_lock);
> + ret = amd_pstate_show_status(buf);
> + mutex_unlock(&amd_pstate_driver_lock);
> +
> + return ret;
> +}
> +
> +static ssize_t store_status(struct kobject *a, struct kobj_attribute *b,
> + const char *buf, size_t count)
> +{
> + char *p = memchr(buf, '\n', count);
> + int ret;
> +
> + mutex_lock(&amd_pstate_driver_lock);
> + ret = amd_pstate_update_status(buf, p ? p - buf : count);
> + mutex_unlock(&amd_pstate_driver_lock);
> +
> + return ret < 0 ? ret : count;
> +}
> +
> cpufreq_freq_attr_ro(amd_pstate_max_freq);
> cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
>
> @@ -805,6 +847,7 @@ cpufreq_freq_attr_ro(amd_pstate_highest_perf);
> cpufreq_freq_attr_rw(energy_performance_preference);
> cpufreq_freq_attr_ro(energy_performance_available_preferences);
> define_one_global_rw(boost);
> +define_one_global_rw(status);
>
> static struct freq_attr *amd_pstate_attr[] = {
> &amd_pstate_max_freq,
> @@ -824,6 +867,7 @@ static struct freq_attr *amd_pstate_epp_attr[] = {
>
> static struct attribute *pstate_global_attributes[] = {
> &boost.attr,
> + &status.attr,
> NULL
> };
>
next prev parent reply other threads:[~2022-11-14 22:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-10 17:58 [PATCH v4 0/9] Implement AMD Pstate EPP Driver Perry Yuan
2022-11-10 17:58 ` [PATCH v4 1/9] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2022-11-10 17:58 ` [PATCH v4 2/9] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2022-11-10 17:58 ` [PATCH v4 3/9] cpufreq: amd-pstate: change amd-pstate driver to be built-in type Perry Yuan
2022-11-14 22:46 ` Limonciello, Mario
2022-11-15 2:02 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 4/9] cpufreq: amd_pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2022-11-14 22:40 ` Limonciello, Mario
2022-11-30 17:12 ` Yuan, Perry
2022-12-02 8:18 ` Yuan, Perry
2022-11-17 14:02 ` Wyes Karny
2022-11-18 3:54 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 5/9] cpufreq: amd_pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-11-10 17:58 ` [PATCH v4 6/9] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-11-10 17:58 ` [PATCH v4 7/9] cpufreq: amd-pstate: add frequency dynamic boost sysfs control Perry Yuan
2022-11-14 22:30 ` Limonciello, Mario
2022-11-30 17:13 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 8/9] cpufreq: amd_pstate: add driver working mode status sysfs entry Perry Yuan
2022-11-14 22:30 ` Limonciello, Mario [this message]
2022-11-30 17:13 ` Yuan, Perry
2022-11-10 17:58 ` [PATCH v4 9/9] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-11-14 22:29 ` Limonciello, Mario
2022-12-02 8:20 ` Yuan, Perry
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