cpufreq: amd-pstate: Add AMD P-State performance attributes

Introduce sysfs attributes to get the different level AMD P-State
performances.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index dbb7eee11170e7aa6c82a0afed032c548a465098..40ceb031abf5c886a29c63517c0bb2b70964361d 100644 (file)
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -546,12 +546,30 @@ static ssize_t show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *poli
        return sprintf(&buf[0], "%u\n", freq);
 }
 
+/*
+ * In some of ASICs, the highest_perf is not the one in the _CPC table, so we
+ * need to expose it to sysfs.
+ */
+static ssize_t show_amd_pstate_highest_perf(struct cpufreq_policy *policy,
+                                           char *buf)
+{
+       u32 perf;
+       struct amd_cpudata *cpudata = policy->driver_data;
+
+       perf = READ_ONCE(cpudata->highest_perf);
+
+       return sprintf(&buf[0], "%u\n", perf);
+}
+
 cpufreq_freq_attr_ro(amd_pstate_max_freq);
 cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
 
+cpufreq_freq_attr_ro(amd_pstate_highest_perf);
+
 static struct freq_attr *amd_pstate_attr[] = {
        &amd_pstate_max_freq,
        &amd_pstate_lowest_nonlinear_freq,
+       &amd_pstate_highest_perf,
        NULL,
 };