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From:   Huang Rui <ray.huang@amd.com>
To:     "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
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CC:     Deepak Sharma <deepak.sharma@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
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        Jinzhou Su <Jinzhou.Su@amd.com>,
        Xiaojian Du <Xiaojian.Du@amd.com>,
        <linux-kernel@vger.kernel.org>, <x86@kernel.org>,
        Huang Rui <ray.huang@amd.com>
Subject: [PATCH 09/19] cpufreq: amd: add amd-pstate checking support check attribute
Date:   Wed, 8 Sep 2021 22:59:51 +0800
Message-ID: <20210908150001.3702552-10-ray.huang@amd.com>
In-Reply-To: <20210908150001.3702552-1-ray.huang@amd.com>
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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