linux-kernel - [PATCH 10/19] cpufreq: amd: add amd-pstate frequencies attributes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210908150001.3702552-11-ray.huang@amd.com>
Date:   Wed, 8 Sep 2021 22:59:52 +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>, 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 10/19] cpufreq: amd: add amd-pstate frequencies attributes

Introduce sysfs attributes to get the different level processor
frequencies.

Signed-off-by: Huang Rui <ray.huang@....com>
---
 drivers/cpufreq/amd-pstate.c | 80 +++++++++++++++++++++++++++++++++++-
 1 file changed, 79 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 48dedd5af101..3c727a22cb69 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -577,16 +577,94 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
 	return 0;
 }
 
-static ssize_t show_is_amd_pstate_enabled(struct cpufreq_policy *policy,
+/* Sysfs attributes */
+
+static ssize_t show_amd_pstate_max_freq(struct cpufreq_policy *policy,
 					char *buf)
+{
+	int ret = 0, max_freq;
+	struct amd_cpudata *cpudata;
+
+	cpudata = policy->driver_data;
+
+	max_freq = amd_get_max_freq(cpudata);
+	if (max_freq < 0)
+		return max_freq;
+
+	ret += sprintf(&buf[ret], "%u\n", max_freq);
+
+	return ret;
+}
+
+static ssize_t show_amd_pstate_nominal_freq(struct cpufreq_policy *policy,
+					    char *buf)
+{
+	int ret = 0, nominal_freq;
+	struct amd_cpudata *cpudata;
+
+	cpudata = policy->driver_data;
+
+	nominal_freq = amd_get_nominal_freq(cpudata);
+	if (nominal_freq < 0)
+		return nominal_freq;
+
+	ret += sprintf(&buf[ret], "%u\n", nominal_freq);
+
+	return ret;
+}
+
+static ssize_t
+show_amd_pstate_lowest_nonlinear_freq(struct cpufreq_policy *policy, char *buf)
+{
+	int ret = 0, freq;
+	struct amd_cpudata *cpudata;
+
+	cpudata = policy->driver_data;
+
+	freq = amd_get_lowest_nonlinear_freq(cpudata);
+	if (freq < 0)
+		return freq;
+
+	ret += sprintf(&buf[ret], "%u\n", freq);
+
+	return ret;
+}
+
+static ssize_t show_amd_pstate_min_freq(struct cpufreq_policy *policy, char *buf)
+{
+	int ret = 0;
+	int freq;
+	struct amd_cpudata *cpudata;
+
+	cpudata = policy->driver_data;
+
+	freq = amd_get_min_freq(cpudata);
+	if (freq < 0)
+		return freq;
+
+	ret += sprintf(&buf[ret], "%u\n", freq);
+
+	return ret;
+}
+
+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);
+cpufreq_freq_attr_ro(amd_pstate_max_freq);
+cpufreq_freq_attr_ro(amd_pstate_nominal_freq);
+cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);
+cpufreq_freq_attr_ro(amd_pstate_min_freq);
 
 static struct freq_attr *amd_pstate_attr[] = {
 	&is_amd_pstate_enabled,
+	&amd_pstate_max_freq,
+	&amd_pstate_nominal_freq,
+	&amd_pstate_lowest_nonlinear_freq,
+	&amd_pstate_min_freq,
 	NULL,
 };
 
-- 
2.25.1