[PATCH 10/16][SRU][OEM-5.14/Jammy] cpufreq: amd-pstate: Add AMD P-State frequencies 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 processor
frequencies.

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 ec4e3326a95507ea96fbad21b9472f5ba25500a7)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/cpufreq/amd-pstate.c | 47 ++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 9e23efc7b9eb..dbb7eee11170 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -509,6 +509,52 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
 	return 0;
 }
 
+/* Sysfs attributes */
+
+/*
+ * This frequency is to indicate the maximum hardware frequency.
+ * If boost is not active but supported, the frequency will be larger than the
+ * one in cpuinfo.
+ */
+static ssize_t show_amd_pstate_max_freq(struct cpufreq_policy *policy,
+					char *buf)
+{
+	int max_freq;
+	struct amd_cpudata *cpudata;
+
+	cpudata = policy->driver_data;
+
+	max_freq = amd_get_max_freq(cpudata);
+	if (max_freq < 0)
+		return max_freq;
+
+	return sprintf(&buf[0], "%u\n", max_freq);
+}
+
+static ssize_t show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *policy,
+						     char *buf)
+{
+	int freq;
+	struct amd_cpudata *cpudata;
+
+	cpudata = policy->driver_data;
+
+	freq = amd_get_lowest_nonlinear_freq(cpudata);
+	if (freq < 0)
+		return freq;
+
+	return sprintf(&buf[0], "%u\n", freq);
+}
+
+cpufreq_freq_attr_ro(amd_pstate_max_freq);
+cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
+
+static struct freq_attr *amd_pstate_attr[] = {
+	&amd_pstate_max_freq,
+	&amd_pstate_lowest_nonlinear_freq,
+	NULL,
+};
+
 static struct cpufreq_driver amd_pstate_driver = {
 	.flags		= CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
 	.verify		= amd_pstate_verify,
@@ -517,6 +563,7 @@ static struct cpufreq_driver amd_pstate_driver = {
 	.exit		= amd_pstate_cpu_exit,
 	.set_boost	= amd_pstate_set_boost,
 	.name		= "amd-pstate",
+	.attr           = amd_pstate_attr,
 };
 
 static int __init amd_pstate_init(void)
-- 
2.34.1