linux-kernel - [PATCH 16/19] cpupower: enable boost state support for amd-pstate module

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Date:   Wed, 8 Sep 2021 22:59:58 +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 16/19] cpupower: enable boost state support for amd-pstate module

The AMD P-state boost API is different from ACPI hardware P-states, so
implement the support for amd-pstate kernel module.

Signed-off-by: Huang Rui <ray.huang@....com>
---
 tools/power/cpupower/lib/cpufreq.c        | 20 ++++++++++++++++++++
 tools/power/cpupower/lib/cpufreq.h        |  3 +++
 tools/power/cpupower/utils/helpers/misc.c |  7 +++++++
 3 files changed, 30 insertions(+)

diff --git a/tools/power/cpupower/lib/cpufreq.c b/tools/power/cpupower/lib/cpufreq.c
index 3f92ddadaad2..37da87bdcfb1 100644
--- a/tools/power/cpupower/lib/cpufreq.c
+++ b/tools/power/cpupower/lib/cpufreq.c
@@ -790,3 +790,23 @@ unsigned long cpufreq_get_transitions(unsigned int cpu)
 {
 	return sysfs_cpufreq_get_one_value(cpu, STATS_NUM_TRANSITIONS);
 }
+
+int amd_pstate_boost_support(unsigned int cpu)
+{
+	unsigned int highest_perf, nominal_perf;
+
+	highest_perf = sysfs_cpufreq_get_one_value(cpu, AMD_PSTATE_HIGHEST_PERF);
+	nominal_perf = sysfs_cpufreq_get_one_value(cpu, AMD_PSTATE_NOMINAL_PERF);
+
+	return highest_perf > nominal_perf ? 1 : 0;
+}
+
+int amd_pstate_boost_enabled(unsigned int cpu)
+{
+	unsigned int cpuinfo_max, amd_pstate_max;
+
+	cpuinfo_max = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MAX_FREQ);
+	amd_pstate_max = sysfs_cpufreq_get_one_value(cpu, AMD_PSTATE_MAX_FREQ);
+
+	return cpuinfo_max == amd_pstate_max ? 1 : 0;
+}
diff --git a/tools/power/cpupower/lib/cpufreq.h b/tools/power/cpupower/lib/cpufreq.h
index 95f4fd9e2656..d54d02a7a4f4 100644
--- a/tools/power/cpupower/lib/cpufreq.h
+++ b/tools/power/cpupower/lib/cpufreq.h
@@ -203,6 +203,9 @@ int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
 int cpufreq_set_frequency(unsigned int cpu,
 				unsigned long target_frequency);
 
+int amd_pstate_boost_support(unsigned int cpu);
+int amd_pstate_boost_enabled(unsigned int cpu);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index 07d80775fb68..aba979320760 100644
--- a/tools/power/cpupower/utils/helpers/misc.c
+++ b/tools/power/cpupower/utils/helpers/misc.c
@@ -10,6 +10,7 @@
 #if defined(__i386__) || defined(__x86_64__)
 
 #include "cpupower_intern.h"
+#include "cpufreq.h"
 
 #define MSR_AMD_HWCR	0xc0010015
 
@@ -39,6 +40,12 @@ int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
 			if (ret)
 				return ret;
 		}
+	} if ((cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATE) &&
+	      amd_pstate_boost_support(cpu)) {
+		*support = 1;
+
+		if (amd_pstate_boost_enabled(cpu))
+			*active = 1;
 	} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
 		*support = *active = 1;
 	return 0;
-- 
2.25.1