linux-kernel - [PATCH v2 10/21] cpufreq: amd: add amd-pstate checking support check attribute

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Message-ID: <20210926090605.3556134-11-ray.huang@amd.com>
Date:   Sun, 26 Sep 2021 17:05:54 +0800
From:   Huang Rui <ray.huang@....com>
To:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        "Borislav Petkov" <bp@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, <linux-pm@...r.kernel.org>
CC:     Deepak Sharma <deepak.sharma@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Mario Limonciello <mario.limonciello@....com>,
        Nathan Fontenot <nathan.fontenot@....com>,
        Jinzhou Su <Jinzhou.Su@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
        Huang Rui <ray.huang@....com>
Subject: [PATCH v2 10/21] cpufreq: amd: add amd-pstate checking support check attribute

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@....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)
-- 
2.25.1