[PATCH v2 10/21] cpufreq: amd: add amd-pstate checking support check attribute
From: Huang Rui <ray.huang@amd.com>
Date: 2021-09-26 09:07:14
Also in:
lkml
Subsystem:
amd pstate driver, cpu frequency scaling framework, the rest · Maintainers:
Huang Rui, Mario Limonciello, "Rafael J. Wysocki", Viresh Kumar, Linus Torvalds
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 847ba00e3351..74f896232d5a 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c@@ -517,6 +517,19 @@ 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,
@@ -525,6 +538,7 @@ 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)
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2.25.1