1 files changed, 179 insertions, 0 deletions
diff --git a/tools/power/cpupower/bench/system.c b/tools/power/cpupower/bench/system.c
new file mode 100644
index 000000000..40f3679e7
--- /dev/null
+++ b/tools/power/cpupower/bench/system.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*  cpufreq-bench CPUFreq microbenchmark
+ *
+ *  Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <sched.h>
+
+#include <cpufreq.h>
+#include <cpupower.h>
+
+#include "config.h"
+#include "system.h"
+
+/**
+ * returns time since epoch in µs
+ *
+ * @retval time
+ **/
+
+long long int get_time()
+{
+	struct timeval now;
+
+	gettimeofday(&now, NULL);
+
+	return (long long int)(now.tv_sec * 1000000LL + now.tv_usec);
+}
+
+/**
+ * sets the cpufreq governor
+ *
+ * @param governor cpufreq governor name
+ * @param cpu cpu for which the governor should be set
+ *
+ * @retval 0 on success
+ * @retval -1 when failed
+ **/
+
+int set_cpufreq_governor(char *governor, unsigned int cpu)
+{
+
+	dprintf("set %s as cpufreq governor\n", governor);
+
+	if (cpupower_is_cpu_online(cpu) != 1) {
+		perror("cpufreq_cpu_exists");
+		fprintf(stderr, "error: cpu %u does not exist\n", cpu);
+		return -1;
+	}
+
+	if (cpufreq_modify_policy_governor(cpu, governor) != 0) {
+		perror("cpufreq_modify_policy_governor");
+		fprintf(stderr, "error: unable to set %s governor\n", governor);
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * sets cpu affinity for the process
+ *
+ * @param cpu cpu# to which the affinity should be set
+ *
+ * @retval 0 on success
+ * @retval -1 when setting the affinity failed
+ **/
+
+int set_cpu_affinity(unsigned int cpu)
+{
+	cpu_set_t cpuset;
+
+	CPU_ZERO(&cpuset);
+	CPU_SET(cpu, &cpuset);
+
+	dprintf("set affinity to cpu #%u\n", cpu);
+
+	if (sched_setaffinity(getpid(), sizeof(cpu_set_t), &cpuset) < 0) {
+		perror("sched_setaffinity");
+		fprintf(stderr, "warning: unable to set cpu affinity\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * sets the process priority parameter
+ *
+ * @param priority priority value
+ *
+ * @retval 0 on success
+ * @retval -1 when setting the priority failed
+ **/
+
+int set_process_priority(int priority)
+{
+	struct sched_param param;
+
+	dprintf("set scheduler priority to %i\n", priority);
+
+	param.sched_priority = priority;
+
+	if (sched_setscheduler(0, SCHEDULER, &param) < 0) {
+		perror("sched_setscheduler");
+		fprintf(stderr, "warning: unable to set scheduler priority\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+/**
+ * notifies the user that the benchmark may run some time
+ *
+ * @param config benchmark config values
+ *
+ **/
+
+void prepare_user(const struct config *config)
+{
+	unsigned long sleep_time = 0;
+	unsigned long load_time = 0;
+	unsigned int round;
+
+	for (round = 0; round < config->rounds; round++) {
+		sleep_time +=  2 * config->cycles *
+			(config->sleep + config->sleep_step * round);
+		load_time += 2 * config->cycles *
+			(config->load + config->load_step * round) +
+			(config->load + config->load_step * round * 4);
+	}
+
+	if (config->verbose || config->output != stdout)
+		printf("approx. test duration: %im\n",
+		       (int)((sleep_time + load_time) / 60000000));
+}
+
+/**
+ * sets up the cpu affinity and scheduler priority
+ *
+ * @param config benchmark config values
+ *
+ **/
+
+void prepare_system(const struct config *config)
+{
+	if (config->verbose)
+		printf("set cpu affinity to cpu #%u\n", config->cpu);
+
+	set_cpu_affinity(config->cpu);
+
+	switch (config->prio) {
+	case SCHED_HIGH:
+		if (config->verbose)
+			printf("high priority condition requested\n");
+
+		set_process_priority(PRIORITY_HIGH);
+		break;
+	case SCHED_LOW:
+		if (config->verbose)
+			printf("low priority condition requested\n");
+
+		set_process_priority(PRIORITY_LOW);
+		break;
+	default:
+		if (config->verbose)
+			printf("default priority condition requested\n");
+
+		set_process_priority(PRIORITY_DEFAULT);
+	}
+}
+