[PATCH 09/19] cpufreq: amd: add amd-pstate checking support check attribute

Huang Rui
2021-09-08T15:01:45Z

The amd-pstate hardware support check will be needed by cpupower to know
whether amd-pstate is enabled and supported.

Signed-off-by: Huang Rui <ray.huang@amd.com>
---
drivers/cpufreq/amd-pstate.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 67a9a117f524..48dedd5af101 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -577,6 +577,19 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
return 0;
}

+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);
+
+static struct freq_attr *amd_pstate_attr[] = {
+ &is_amd_pstate_enabled,
+ NULL,
+};
+
static struct cpufreq_driver amd_pstate_driver = {
.flags = CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
.verify = amd_pstate_verify,
@@ -586,6 +599,7 @@ 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)
--
2.25.1