[PATCH 10/19] cpufreq: amd: add amd-pstate frequencies attributes

Huang Rui
2021-09-08T15:01:43Z

Introduce sysfs attributes to get the different level processor
frequencies.

Signed-off-by: Huang Rui <ray.huang@amd.com>
---
drivers/cpufreq/amd-pstate.c | 80 +++++++++++++++++++++++++++++++++++-
1 file changed, 79 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 48dedd5af101..3c727a22cb69 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -577,16 +577,94 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
return 0;
}

-static ssize_t show_is_amd_pstate_enabled(struct cpufreq_policy *policy,
+/* Sysfs attributes */
+
+static ssize_t show_amd_pstate_max_freq(struct cpufreq_policy *policy,
char *buf)
+{
+ int ret = 0, max_freq;
+ struct amd_cpudata *cpudata;
+
+ cpudata = policy->driver_data;
+
+ max_freq = amd_get_max_freq(cpudata);
+ if (max_freq < 0)
+ return max_freq;
+
+ ret += sprintf(&buf[ret], "%u\n", max_freq);
+
+ return ret;
+}
+
+static ssize_t show_amd_pstate_nominal_freq(struct cpufreq_policy *policy,
+ char *buf)
+{
+ int ret = 0, nominal_freq;
+ struct amd_cpudata *cpudata;
+
+ cpudata = policy->driver_data;
+
+ nominal_freq = amd_get_nominal_freq(cpudata);
+ if (nominal_freq < 0)
+ return nominal_freq;
+
+ ret += sprintf(&buf[ret], "%u\n", nominal_freq);
+
+ return ret;
+}
+
+static ssize_t
+show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *policy, char *buf)
+{
+ int ret = 0, freq;
+ struct amd_cpudata *cpudata;
+
+ cpudata = policy->driver_data;
+
+ freq = amd_get_lowest_nonlinear_freq(cpudata);
+ if (freq < 0)
+ return freq;
+
+ ret += sprintf(&buf[ret], "%u\n", freq);
+
+ return ret;
+}
+
+static ssize_t show_amd_pstate_min_freq(struct cpufreq_policy *policy, char *buf)
+{
+ int ret = 0;
+ int freq;
+ struct amd_cpudata *cpudata;
+
+ cpudata = policy->driver_data;
+
+ freq = amd_get_min_freq(cpudata);
+ if (freq < 0)
+ return freq;
+
+ ret += sprintf(&buf[ret], "%u\n", freq);
+
+ return ret;
+}
+
+static ssize_t show_is_amd_pstate_enabled(struct cpufreq_policy *policy,
+ char *buf)
{
return sprintf(&buf[0], "%d\n", acpi_cpc_valid() ? 1 : 0);
}

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);

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,
NULL,
};

--
2.25.1