[PATCH 11/16][SRU][OEM-5.14/Jammy] cpufreq: amd-pstate: Add AMD P-State performance attributes

[You-Sheng Yang]

From: Huang Rui <ray.huang at amd.com>

BugLink: https://bugs.launchpad.net/bugs/1956509

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

Signed-off-by: Huang Rui <ray.huang at amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
(cherry picked from commit 3ad7fde16a04aa70df8a59cba99e225ef9adf42f)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/cpufreq/amd-pstate.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index dbb7eee11170..40ceb031abf5 100644
--- 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,
 };
 
-- 
2.34.1