linux-kernel - [PATCH 6/6] cpupower: Add turbo-boost support in cpupower

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Date:   Mon, 12 Jun 2023 11:36:15 +0000
From:   Wyes Karny <wyes.karny@....com>
To:     <rafael@...nel.org>, <ray.huang@....com>,
        <viresh.kumar@...aro.org>, <trenn@...e.com>, <shuah@...nel.org>
CC:     <gautham.shenoy@....com>, <Mario.Limonciello@....com>,
        <Perry.Yuan@....com>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Wyes Karny <wyes.karny@....com>
Subject: [PATCH 6/6] cpupower: Add turbo-boost support in cpupower

If boost sysfs (/sys/devices/system/cpu/cpufreq/boost) file is present
turbo-boost is feature is supported in the hardware. By default this
feature should be enabled. But to disable/enable it write to the sysfs
file. Use the same to control this feature via cpupower.

To enable:
cpupower set --turbo-boost 1

To disable:
cpupower set --turbo-boost 0

Reviewed-by: Gautham R. Shenoy <gautham.shenoy@....com>
Signed-off-by: Wyes Karny <wyes.karny@....com>
---
 tools/power/cpupower/utils/cpupower-set.c    | 22 +++++++++++++++++++-
 tools/power/cpupower/utils/helpers/helpers.h |  3 +++
 tools/power/cpupower/utils/helpers/misc.c    | 18 ++++++++++++++++
 3 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/tools/power/cpupower/utils/cpupower-set.c b/tools/power/cpupower/utils/cpupower-set.c
index c2ba69b7ea54..0677b58374ab 100644
--- a/tools/power/cpupower/utils/cpupower-set.c
+++ b/tools/power/cpupower/utils/cpupower-set.c
@@ -20,6 +20,7 @@ static struct option set_opts[] = {
 	{"perf-bias", required_argument, NULL, 'b'},
 	{"epp", required_argument, NULL, 'e'},
 	{"amd-pstate-mode", required_argument, NULL, 'm'},
+	{"turbo-boost", required_argument, NULL, 't'},
 	{ },
 };
 
@@ -41,10 +42,11 @@ int cmd_set(int argc, char **argv)
 			int perf_bias:1;
 			int epp:1;
 			int mode:1;
+			int turbo_boost:1;
 		};
 		int params;
 	} params;
-	int perf_bias = 0;
+	int perf_bias = 0, turbo_boost = 1;
 	int ret = 0;
 	char epp[30], mode[20];
 
@@ -94,6 +96,18 @@ int cmd_set(int argc, char **argv)
 			}
 			params.mode = 1;
 			break;
+		case 't':
+			if (params.turbo_boost)
+				print_wrong_arg_exit();
+			turbo_boost = atoi(optarg);
+			if (turbo_boost < 0 || turbo_boost > 1) {
+				printf("--turbo-boost param out of range [0-1]\n");
+				print_wrong_arg_exit();
+			}
+			params.turbo_boost = 1;
+			break;
+
+
 		default:
 			print_wrong_arg_exit();
 		}
@@ -108,6 +122,12 @@ int cmd_set(int argc, char **argv)
 			fprintf(stderr, "Error setting mode\n");
 	}
 
+	if (params.turbo_boost) {
+		ret = cpupower_set_turbo_boost(turbo_boost);
+		if (ret)
+			fprintf(stderr, "Error setting turbo-boost\n");
+	}
+
 	/* Default is: set all CPUs */
 	if (bitmask_isallclear(cpus_chosen))
 		bitmask_setall(cpus_chosen);
diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
index d35596631eef..95749b8ee475 100644
--- a/tools/power/cpupower/utils/helpers/helpers.h
+++ b/tools/power/cpupower/utils/helpers/helpers.h
@@ -118,6 +118,7 @@ extern unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu);
 
 extern int cpupower_set_epp(unsigned int cpu, char *epp);
 extern int cpupower_set_amd_pstate_mode(char *mode);
+extern int cpupower_set_turbo_boost(int turbo_boost);
 
 /* Read/Write msr ****************************/
 
@@ -180,6 +181,8 @@ static inline int cpupower_set_epp(unsigned int cpu, char *epp)
 { return -1; };
 static inline int cpupower_set_amd_pstate_mode(char *mode)
 { return -1; };
+static inline int cpupower_set_turbo_boost(int turbo_boost)
+{ return -1; };
 
 /* Read/Write msr ****************************/
 
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index 9df9af8a969e..fc822a0e6b7b 100644
--- a/tools/power/cpupower/utils/helpers/misc.c
+++ b/tools/power/cpupower/utils/helpers/misc.c
@@ -124,6 +124,24 @@ int cpupower_set_amd_pstate_mode(char *mode)
 	return 0;
 }
 
+int cpupower_set_turbo_boost(int turbo_boost)
+{
+	char path[SYSFS_PATH_MAX];
+	char linebuf[2] = {};
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpufreq/boost");
+
+	if (!is_valid_path(path))
+		return -1;
+
+	snprintf(linebuf, sizeof(linebuf), "%d", turbo_boost);
+
+	if (cpupower_write_sysfs(path, linebuf, 2) <= 0)
+		return -1;
+
+	return 0;
+}
+
 bool cpupower_amd_pstate_enabled(void)
 {
 	char *driver = cpufreq_get_driver(0);
-- 
2.34.1