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-rw-r--r--tools/power/cpupower/lib/acpi_cppc.c59
-rw-r--r--tools/power/cpupower/lib/acpi_cppc.h21
-rw-r--r--tools/power/cpupower/lib/cpufreq.c785
-rw-r--r--tools/power/cpupower/lib/cpufreq.h222
-rw-r--r--tools/power/cpupower/lib/cpuidle.c379
-rw-r--r--tools/power/cpupower/lib/cpuidle.h24
-rw-r--r--tools/power/cpupower/lib/cpupower.c219
-rw-r--r--tools/power/cpupower/lib/cpupower.h36
-rw-r--r--tools/power/cpupower/lib/cpupower_intern.h12
-rw-r--r--tools/power/cpupower/lib/powercap.c299
-rw-r--r--tools/power/cpupower/lib/powercap.h54
11 files changed, 2110 insertions, 0 deletions
diff --git a/tools/power/cpupower/lib/acpi_cppc.c b/tools/power/cpupower/lib/acpi_cppc.c
new file mode 100644
index 0000000000..c401ac331e
--- /dev/null
+++ b/tools/power/cpupower/lib/acpi_cppc.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "cpupower_intern.h"
+#include "acpi_cppc.h"
+
+/* ACPI CPPC sysfs access ***********************************************/
+
+static int acpi_cppc_read_file(unsigned int cpu, const char *fname,
+ char *buf, size_t buflen)
+{
+ char path[SYSFS_PATH_MAX];
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/acpi_cppc/%s",
+ cpu, fname);
+ return cpupower_read_sysfs(path, buf, buflen);
+}
+
+static const char * const acpi_cppc_value_files[] = {
+ [HIGHEST_PERF] = "highest_perf",
+ [LOWEST_PERF] = "lowest_perf",
+ [NOMINAL_PERF] = "nominal_perf",
+ [LOWEST_NONLINEAR_PERF] = "lowest_nonlinear_perf",
+ [LOWEST_FREQ] = "lowest_freq",
+ [NOMINAL_FREQ] = "nominal_freq",
+ [REFERENCE_PERF] = "reference_perf",
+ [WRAPAROUND_TIME] = "wraparound_time"
+};
+
+unsigned long acpi_cppc_get_data(unsigned int cpu, enum acpi_cppc_value which)
+{
+ unsigned long long value;
+ unsigned int len;
+ char linebuf[MAX_LINE_LEN];
+ char *endp;
+
+ if (which >= MAX_CPPC_VALUE_FILES)
+ return 0;
+
+ len = acpi_cppc_read_file(cpu, acpi_cppc_value_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return 0;
+
+ value = strtoull(linebuf, &endp, 0);
+
+ if (endp == linebuf || errno == ERANGE)
+ return 0;
+
+ return value;
+}
diff --git a/tools/power/cpupower/lib/acpi_cppc.h b/tools/power/cpupower/lib/acpi_cppc.h
new file mode 100644
index 0000000000..85ca830803
--- /dev/null
+++ b/tools/power/cpupower/lib/acpi_cppc.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __ACPI_CPPC_H__
+#define __ACPI_CPPC_H__
+
+enum acpi_cppc_value {
+ HIGHEST_PERF,
+ LOWEST_PERF,
+ NOMINAL_PERF,
+ LOWEST_NONLINEAR_PERF,
+ LOWEST_FREQ,
+ NOMINAL_FREQ,
+ REFERENCE_PERF,
+ WRAPAROUND_TIME,
+ MAX_CPPC_VALUE_FILES
+};
+
+unsigned long acpi_cppc_get_data(unsigned int cpu,
+ enum acpi_cppc_value which);
+
+#endif /* _ACPI_CPPC_H */
diff --git a/tools/power/cpupower/lib/cpufreq.c b/tools/power/cpupower/lib/cpufreq.c
new file mode 100644
index 0000000000..1516d23c17
--- /dev/null
+++ b/tools/power/cpupower/lib/cpufreq.c
@@ -0,0 +1,785 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
+ */
+
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "cpufreq.h"
+#include "cpupower_intern.h"
+
+/* CPUFREQ sysfs access **************************************************/
+
+/* helper function to read file from /sys into given buffer */
+/* fname is a relative path under "cpuX/cpufreq" dir */
+static unsigned int sysfs_cpufreq_read_file(unsigned int cpu, const char *fname,
+ char *buf, size_t buflen)
+{
+ char path[SYSFS_PATH_MAX];
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s",
+ cpu, fname);
+ return cpupower_read_sysfs(path, buf, buflen);
+}
+
+/* helper function to write a new value to a /sys file */
+/* fname is a relative path under "cpuX/cpufreq" dir */
+static unsigned int sysfs_cpufreq_write_file(unsigned int cpu,
+ const char *fname,
+ const char *value, size_t len)
+{
+ char path[SYSFS_PATH_MAX];
+ int fd;
+ ssize_t numwrite;
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpufreq/%s",
+ cpu, fname);
+
+ fd = open(path, O_WRONLY);
+ if (fd == -1)
+ return 0;
+
+ numwrite = write(fd, value, len);
+ if (numwrite < 1) {
+ close(fd);
+ return 0;
+ }
+
+ close(fd);
+
+ return (unsigned int) numwrite;
+}
+
+/* read access to files which contain one numeric value */
+
+enum cpufreq_value {
+ CPUINFO_CUR_FREQ,
+ CPUINFO_MIN_FREQ,
+ CPUINFO_MAX_FREQ,
+ CPUINFO_LATENCY,
+ SCALING_CUR_FREQ,
+ SCALING_MIN_FREQ,
+ SCALING_MAX_FREQ,
+ STATS_NUM_TRANSITIONS,
+ MAX_CPUFREQ_VALUE_READ_FILES
+};
+
+static const char *cpufreq_value_files[MAX_CPUFREQ_VALUE_READ_FILES] = {
+ [CPUINFO_CUR_FREQ] = "cpuinfo_cur_freq",
+ [CPUINFO_MIN_FREQ] = "cpuinfo_min_freq",
+ [CPUINFO_MAX_FREQ] = "cpuinfo_max_freq",
+ [CPUINFO_LATENCY] = "cpuinfo_transition_latency",
+ [SCALING_CUR_FREQ] = "scaling_cur_freq",
+ [SCALING_MIN_FREQ] = "scaling_min_freq",
+ [SCALING_MAX_FREQ] = "scaling_max_freq",
+ [STATS_NUM_TRANSITIONS] = "stats/total_trans"
+};
+
+unsigned long cpufreq_get_sysfs_value_from_table(unsigned int cpu,
+ const char **table,
+ unsigned int index,
+ unsigned int size)
+{
+ unsigned long value;
+ unsigned int len;
+ char linebuf[MAX_LINE_LEN];
+ char *endp;
+
+ if (!table || index >= size || !table[index])
+ return 0;
+
+ len = sysfs_cpufreq_read_file(cpu, table[index], linebuf,
+ sizeof(linebuf));
+
+ if (len == 0)
+ return 0;
+
+ value = strtoul(linebuf, &endp, 0);
+
+ if (endp == linebuf || errno == ERANGE)
+ return 0;
+
+ return value;
+}
+
+static unsigned long sysfs_cpufreq_get_one_value(unsigned int cpu,
+ enum cpufreq_value which)
+{
+ return cpufreq_get_sysfs_value_from_table(cpu, cpufreq_value_files,
+ which,
+ MAX_CPUFREQ_VALUE_READ_FILES);
+}
+
+/* read access to files which contain one string */
+
+enum cpufreq_string {
+ SCALING_DRIVER,
+ SCALING_GOVERNOR,
+ MAX_CPUFREQ_STRING_FILES
+};
+
+static const char *cpufreq_string_files[MAX_CPUFREQ_STRING_FILES] = {
+ [SCALING_DRIVER] = "scaling_driver",
+ [SCALING_GOVERNOR] = "scaling_governor",
+};
+
+
+static char *sysfs_cpufreq_get_one_string(unsigned int cpu,
+ enum cpufreq_string which)
+{
+ char linebuf[MAX_LINE_LEN];
+ char *result;
+ unsigned int len;
+
+ if (which >= MAX_CPUFREQ_STRING_FILES)
+ return NULL;
+
+ len = sysfs_cpufreq_read_file(cpu, cpufreq_string_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ result = strdup(linebuf);
+ if (result == NULL)
+ return NULL;
+
+ if (result[strlen(result) - 1] == '\n')
+ result[strlen(result) - 1] = '\0';
+
+ return result;
+}
+
+/* write access */
+
+enum cpufreq_write {
+ WRITE_SCALING_MIN_FREQ,
+ WRITE_SCALING_MAX_FREQ,
+ WRITE_SCALING_GOVERNOR,
+ WRITE_SCALING_SET_SPEED,
+ MAX_CPUFREQ_WRITE_FILES
+};
+
+static const char *cpufreq_write_files[MAX_CPUFREQ_WRITE_FILES] = {
+ [WRITE_SCALING_MIN_FREQ] = "scaling_min_freq",
+ [WRITE_SCALING_MAX_FREQ] = "scaling_max_freq",
+ [WRITE_SCALING_GOVERNOR] = "scaling_governor",
+ [WRITE_SCALING_SET_SPEED] = "scaling_setspeed",
+};
+
+static int sysfs_cpufreq_write_one_value(unsigned int cpu,
+ enum cpufreq_write which,
+ const char *new_value, size_t len)
+{
+ if (which >= MAX_CPUFREQ_WRITE_FILES)
+ return 0;
+
+ if (sysfs_cpufreq_write_file(cpu, cpufreq_write_files[which],
+ new_value, len) != len)
+ return -ENODEV;
+
+ return 0;
+};
+
+unsigned long cpufreq_get_freq_kernel(unsigned int cpu)
+{
+ return sysfs_cpufreq_get_one_value(cpu, SCALING_CUR_FREQ);
+}
+
+unsigned long cpufreq_get_freq_hardware(unsigned int cpu)
+{
+ return sysfs_cpufreq_get_one_value(cpu, CPUINFO_CUR_FREQ);
+}
+
+unsigned long cpufreq_get_transition_latency(unsigned int cpu)
+{
+ return sysfs_cpufreq_get_one_value(cpu, CPUINFO_LATENCY);
+}
+
+int cpufreq_get_hardware_limits(unsigned int cpu,
+ unsigned long *min,
+ unsigned long *max)
+{
+ if ((!min) || (!max))
+ return -EINVAL;
+
+ *min = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MIN_FREQ);
+ if (!*min)
+ return -ENODEV;
+
+ *max = sysfs_cpufreq_get_one_value(cpu, CPUINFO_MAX_FREQ);
+ if (!*max)
+ return -ENODEV;
+
+ return 0;
+}
+
+char *cpufreq_get_driver(unsigned int cpu)
+{
+ return sysfs_cpufreq_get_one_string(cpu, SCALING_DRIVER);
+}
+
+void cpufreq_put_driver(char *ptr)
+{
+ if (!ptr)
+ return;
+ free(ptr);
+}
+
+struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu)
+{
+ struct cpufreq_policy *policy;
+
+ policy = malloc(sizeof(struct cpufreq_policy));
+ if (!policy)
+ return NULL;
+
+ policy->governor = sysfs_cpufreq_get_one_string(cpu, SCALING_GOVERNOR);
+ if (!policy->governor) {
+ free(policy);
+ return NULL;
+ }
+ policy->min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ);
+ policy->max = sysfs_cpufreq_get_one_value(cpu, SCALING_MAX_FREQ);
+ if ((!policy->min) || (!policy->max)) {
+ free(policy->governor);
+ free(policy);
+ return NULL;
+ }
+
+ return policy;
+}
+
+void cpufreq_put_policy(struct cpufreq_policy *policy)
+{
+ if ((!policy) || (!policy->governor))
+ return;
+
+ free(policy->governor);
+ policy->governor = NULL;
+ free(policy);
+}
+
+struct cpufreq_available_governors *cpufreq_get_available_governors(unsigned
+ int cpu)
+{
+ struct cpufreq_available_governors *first = NULL;
+ struct cpufreq_available_governors *current = NULL;
+ char linebuf[MAX_LINE_LEN];
+ unsigned int pos, i;
+ unsigned int len;
+
+ len = sysfs_cpufreq_read_file(cpu, "scaling_available_governors",
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ pos = 0;
+ for (i = 0; i < len; i++) {
+ if (linebuf[i] == ' ' || linebuf[i] == '\n') {
+ if (i - pos < 2)
+ continue;
+ if (current) {
+ current->next = malloc(sizeof(*current));
+ if (!current->next)
+ goto error_out;
+ current = current->next;
+ } else {
+ first = malloc(sizeof(*first));
+ if (!first)
+ return NULL;
+ current = first;
+ }
+ current->first = first;
+ current->next = NULL;
+
+ current->governor = malloc(i - pos + 1);
+ if (!current->governor)
+ goto error_out;
+
+ memcpy(current->governor, linebuf + pos, i - pos);
+ current->governor[i - pos] = '\0';
+ pos = i + 1;
+ }
+ }
+
+ return first;
+
+ error_out:
+ while (first) {
+ current = first->next;
+ if (first->governor)
+ free(first->governor);
+ free(first);
+ first = current;
+ }
+ return NULL;
+}
+
+void cpufreq_put_available_governors(struct cpufreq_available_governors *any)
+{
+ struct cpufreq_available_governors *tmp, *next;
+
+ if (!any)
+ return;
+
+ tmp = any->first;
+ while (tmp) {
+ next = tmp->next;
+ if (tmp->governor)
+ free(tmp->governor);
+ free(tmp);
+ tmp = next;
+ }
+}
+
+
+struct cpufreq_available_frequencies
+*cpufreq_get_available_frequencies(unsigned int cpu)
+{
+ struct cpufreq_available_frequencies *first = NULL;
+ struct cpufreq_available_frequencies *current = NULL;
+ char one_value[SYSFS_PATH_MAX];
+ char linebuf[MAX_LINE_LEN];
+ unsigned int pos, i;
+ unsigned int len;
+
+ len = sysfs_cpufreq_read_file(cpu, "scaling_available_frequencies",
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ pos = 0;
+ for (i = 0; i < len; i++) {
+ if (linebuf[i] == ' ' || linebuf[i] == '\n') {
+ if (i - pos < 2)
+ continue;
+ if (i - pos >= SYSFS_PATH_MAX)
+ goto error_out;
+ if (current) {
+ current->next = malloc(sizeof(*current));
+ if (!current->next)
+ goto error_out;
+ current = current->next;
+ } else {
+ first = malloc(sizeof(*first));
+ if (!first)
+ return NULL;
+ current = first;
+ }
+ current->first = first;
+ current->next = NULL;
+
+ memcpy(one_value, linebuf + pos, i - pos);
+ one_value[i - pos] = '\0';
+ if (sscanf(one_value, "%lu", &current->frequency) != 1)
+ goto error_out;
+
+ pos = i + 1;
+ }
+ }
+
+ return first;
+
+ error_out:
+ while (first) {
+ current = first->next;
+ free(first);
+ first = current;
+ }
+ return NULL;
+}
+
+struct cpufreq_available_frequencies
+*cpufreq_get_boost_frequencies(unsigned int cpu)
+{
+ struct cpufreq_available_frequencies *first = NULL;
+ struct cpufreq_available_frequencies *current = NULL;
+ char one_value[SYSFS_PATH_MAX];
+ char linebuf[MAX_LINE_LEN];
+ unsigned int pos, i;
+ unsigned int len;
+
+ len = sysfs_cpufreq_read_file(cpu, "scaling_boost_frequencies",
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ pos = 0;
+ for (i = 0; i < len; i++) {
+ if (linebuf[i] == ' ' || linebuf[i] == '\n') {
+ if (i - pos < 2)
+ continue;
+ if (i - pos >= SYSFS_PATH_MAX)
+ goto error_out;
+ if (current) {
+ current->next = malloc(sizeof(*current));
+ if (!current->next)
+ goto error_out;
+ current = current->next;
+ } else {
+ first = malloc(sizeof(*first));
+ if (!first)
+ return NULL;
+ current = first;
+ }
+ current->first = first;
+ current->next = NULL;
+
+ memcpy(one_value, linebuf + pos, i - pos);
+ one_value[i - pos] = '\0';
+ if (sscanf(one_value, "%lu", &current->frequency) != 1)
+ goto error_out;
+
+ pos = i + 1;
+ }
+ }
+
+ return first;
+
+ error_out:
+ while (first) {
+ current = first->next;
+ free(first);
+ first = current;
+ }
+ return NULL;
+}
+
+void cpufreq_put_available_frequencies(struct cpufreq_available_frequencies *any)
+{
+ struct cpufreq_available_frequencies *tmp, *next;
+
+ if (!any)
+ return;
+
+ tmp = any->first;
+ while (tmp) {
+ next = tmp->next;
+ free(tmp);
+ tmp = next;
+ }
+}
+
+void cpufreq_put_boost_frequencies(struct cpufreq_available_frequencies *any)
+{
+ cpufreq_put_available_frequencies(any);
+}
+
+static struct cpufreq_affected_cpus *sysfs_get_cpu_list(unsigned int cpu,
+ const char *file)
+{
+ struct cpufreq_affected_cpus *first = NULL;
+ struct cpufreq_affected_cpus *current = NULL;
+ char one_value[SYSFS_PATH_MAX];
+ char linebuf[MAX_LINE_LEN];
+ unsigned int pos, i;
+ unsigned int len;
+
+ len = sysfs_cpufreq_read_file(cpu, file, linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ pos = 0;
+ for (i = 0; i < len; i++) {
+ if (i == len || linebuf[i] == ' ' || linebuf[i] == '\n') {
+ if (i - pos < 1)
+ continue;
+ if (i - pos >= SYSFS_PATH_MAX)
+ goto error_out;
+ if (current) {
+ current->next = malloc(sizeof(*current));
+ if (!current->next)
+ goto error_out;
+ current = current->next;
+ } else {
+ first = malloc(sizeof(*first));
+ if (!first)
+ return NULL;
+ current = first;
+ }
+ current->first = first;
+ current->next = NULL;
+
+ memcpy(one_value, linebuf + pos, i - pos);
+ one_value[i - pos] = '\0';
+
+ if (sscanf(one_value, "%u", &current->cpu) != 1)
+ goto error_out;
+
+ pos = i + 1;
+ }
+ }
+
+ return first;
+
+ error_out:
+ while (first) {
+ current = first->next;
+ free(first);
+ first = current;
+ }
+ return NULL;
+}
+
+struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned int cpu)
+{
+ return sysfs_get_cpu_list(cpu, "affected_cpus");
+}
+
+void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *any)
+{
+ struct cpufreq_affected_cpus *tmp, *next;
+
+ if (!any)
+ return;
+
+ tmp = any->first;
+ while (tmp) {
+ next = tmp->next;
+ free(tmp);
+ tmp = next;
+ }
+}
+
+
+struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned int cpu)
+{
+ return sysfs_get_cpu_list(cpu, "related_cpus");
+}
+
+void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *any)
+{
+ cpufreq_put_affected_cpus(any);
+}
+
+static int verify_gov(char *new_gov, char *passed_gov)
+{
+ unsigned int i, j = 0;
+
+ if (!passed_gov || (strlen(passed_gov) > 19))
+ return -EINVAL;
+
+ strncpy(new_gov, passed_gov, 20);
+ for (i = 0; i < 20; i++) {
+ if (j) {
+ new_gov[i] = '\0';
+ continue;
+ }
+ if ((new_gov[i] >= 'a') && (new_gov[i] <= 'z'))
+ continue;
+
+ if ((new_gov[i] >= 'A') && (new_gov[i] <= 'Z'))
+ continue;
+
+ if (new_gov[i] == '-')
+ continue;
+
+ if (new_gov[i] == '_')
+ continue;
+
+ if (new_gov[i] == '\0') {
+ j = 1;
+ continue;
+ }
+ return -EINVAL;
+ }
+ new_gov[19] = '\0';
+ return 0;
+}
+
+int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy)
+{
+ char min[SYSFS_PATH_MAX];
+ char max[SYSFS_PATH_MAX];
+ char gov[SYSFS_PATH_MAX];
+ int ret;
+ unsigned long old_min;
+ int write_max_first;
+
+ if (!policy || !(policy->governor))
+ return -EINVAL;
+
+ if (policy->max < policy->min)
+ return -EINVAL;
+
+ if (verify_gov(gov, policy->governor))
+ return -EINVAL;
+
+ snprintf(min, SYSFS_PATH_MAX, "%lu", policy->min);
+ snprintf(max, SYSFS_PATH_MAX, "%lu", policy->max);
+
+ old_min = sysfs_cpufreq_get_one_value(cpu, SCALING_MIN_FREQ);
+ write_max_first = (old_min && (policy->max < old_min) ? 0 : 1);
+
+ if (write_max_first) {
+ ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
+ max, strlen(max));
+ if (ret)
+ return ret;
+ }
+
+ ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ, min,
+ strlen(min));
+ if (ret)
+ return ret;
+
+ if (!write_max_first) {
+ ret = sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
+ max, strlen(max));
+ if (ret)
+ return ret;
+ }
+
+ return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR,
+ gov, strlen(gov));
+}
+
+
+int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq)
+{
+ char value[SYSFS_PATH_MAX];
+
+ snprintf(value, SYSFS_PATH_MAX, "%lu", min_freq);
+
+ return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MIN_FREQ,
+ value, strlen(value));
+}
+
+
+int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq)
+{
+ char value[SYSFS_PATH_MAX];
+
+ snprintf(value, SYSFS_PATH_MAX, "%lu", max_freq);
+
+ return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_MAX_FREQ,
+ value, strlen(value));
+}
+
+int cpufreq_modify_policy_governor(unsigned int cpu, char *governor)
+{
+ char new_gov[SYSFS_PATH_MAX];
+
+ if ((!governor) || (strlen(governor) > 19))
+ return -EINVAL;
+
+ if (verify_gov(new_gov, governor))
+ return -EINVAL;
+
+ return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_GOVERNOR,
+ new_gov, strlen(new_gov));
+}
+
+int cpufreq_set_frequency(unsigned int cpu, unsigned long target_frequency)
+{
+ struct cpufreq_policy *pol = cpufreq_get_policy(cpu);
+ char userspace_gov[] = "userspace";
+ char freq[SYSFS_PATH_MAX];
+ int ret;
+
+ if (!pol)
+ return -ENODEV;
+
+ if (strncmp(pol->governor, userspace_gov, 9) != 0) {
+ ret = cpufreq_modify_policy_governor(cpu, userspace_gov);
+ if (ret) {
+ cpufreq_put_policy(pol);
+ return ret;
+ }
+ }
+
+ cpufreq_put_policy(pol);
+
+ snprintf(freq, SYSFS_PATH_MAX, "%lu", target_frequency);
+
+ return sysfs_cpufreq_write_one_value(cpu, WRITE_SCALING_SET_SPEED,
+ freq, strlen(freq));
+}
+
+struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
+ unsigned long long *total_time)
+{
+ struct cpufreq_stats *first = NULL;
+ struct cpufreq_stats *current = NULL;
+ char one_value[SYSFS_PATH_MAX];
+ char linebuf[MAX_LINE_LEN];
+ unsigned int pos, i;
+ unsigned int len;
+
+ len = sysfs_cpufreq_read_file(cpu, "stats/time_in_state",
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ *total_time = 0;
+ pos = 0;
+ for (i = 0; i < len; i++) {
+ if (i == strlen(linebuf) || linebuf[i] == '\n') {
+ if (i - pos < 2)
+ continue;
+ if ((i - pos) >= SYSFS_PATH_MAX)
+ goto error_out;
+ if (current) {
+ current->next = malloc(sizeof(*current));
+ if (!current->next)
+ goto error_out;
+ current = current->next;
+ } else {
+ first = malloc(sizeof(*first));
+ if (!first)
+ return NULL;
+ current = first;
+ }
+ current->first = first;
+ current->next = NULL;
+
+ memcpy(one_value, linebuf + pos, i - pos);
+ one_value[i - pos] = '\0';
+ if (sscanf(one_value, "%lu %llu",
+ &current->frequency,
+ &current->time_in_state) != 2)
+ goto error_out;
+
+ *total_time = *total_time + current->time_in_state;
+ pos = i + 1;
+ }
+ }
+
+ return first;
+
+ error_out:
+ while (first) {
+ current = first->next;
+ free(first);
+ first = current;
+ }
+ return NULL;
+}
+
+void cpufreq_put_stats(struct cpufreq_stats *any)
+{
+ struct cpufreq_stats *tmp, *next;
+
+ if (!any)
+ return;
+
+ tmp = any->first;
+ while (tmp) {
+ next = tmp->next;
+ free(tmp);
+ tmp = next;
+ }
+}
+
+unsigned long cpufreq_get_transitions(unsigned int cpu)
+{
+ return sysfs_cpufreq_get_one_value(cpu, STATS_NUM_TRANSITIONS);
+}
diff --git a/tools/power/cpupower/lib/cpufreq.h b/tools/power/cpupower/lib/cpufreq.h
new file mode 100644
index 0000000000..2f3c840358
--- /dev/null
+++ b/tools/power/cpupower/lib/cpufreq.h
@@ -0,0 +1,222 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * cpufreq.h - definitions for libcpufreq
+ *
+ * Copyright (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
+ */
+
+#ifndef __CPUPOWER_CPUFREQ_H__
+#define __CPUPOWER_CPUFREQ_H__
+
+struct cpufreq_policy {
+ unsigned long min;
+ unsigned long max;
+ char *governor;
+};
+
+struct cpufreq_available_governors {
+ char *governor;
+ struct cpufreq_available_governors *next;
+ struct cpufreq_available_governors *first;
+};
+
+struct cpufreq_available_frequencies {
+ unsigned long frequency;
+ struct cpufreq_available_frequencies *next;
+ struct cpufreq_available_frequencies *first;
+};
+
+
+struct cpufreq_affected_cpus {
+ unsigned int cpu;
+ struct cpufreq_affected_cpus *next;
+ struct cpufreq_affected_cpus *first;
+};
+
+struct cpufreq_stats {
+ unsigned long frequency;
+ unsigned long long time_in_state;
+ struct cpufreq_stats *next;
+ struct cpufreq_stats *first;
+};
+
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* determine current CPU frequency
+ * - _kernel variant means kernel's opinion of CPU frequency
+ * - _hardware variant means actual hardware CPU frequency,
+ * which is only available to root.
+ *
+ * returns 0 on failure, else frequency in kHz.
+ */
+
+unsigned long cpufreq_get_freq_kernel(unsigned int cpu);
+
+unsigned long cpufreq_get_freq_hardware(unsigned int cpu);
+
+#define cpufreq_get(cpu) cpufreq_get_freq_kernel(cpu);
+
+
+/* determine CPU transition latency
+ *
+ * returns 0 on failure, else transition latency in 10^(-9) s = nanoseconds
+ */
+unsigned long cpufreq_get_transition_latency(unsigned int cpu);
+
+
+/* determine hardware CPU frequency limits
+ *
+ * These may be limited further by thermal, energy or other
+ * considerations by cpufreq policy notifiers in the kernel.
+ */
+
+int cpufreq_get_hardware_limits(unsigned int cpu,
+ unsigned long *min,
+ unsigned long *max);
+
+
+/* determine CPUfreq driver used
+ *
+ * Remember to call cpufreq_put_driver when no longer needed
+ * to avoid memory leakage, please.
+ */
+
+char *cpufreq_get_driver(unsigned int cpu);
+
+void cpufreq_put_driver(char *ptr);
+
+
+/* determine CPUfreq policy currently used
+ *
+ * Remember to call cpufreq_put_policy when no longer needed
+ * to avoid memory leakage, please.
+ */
+
+
+struct cpufreq_policy *cpufreq_get_policy(unsigned int cpu);
+
+void cpufreq_put_policy(struct cpufreq_policy *policy);
+
+
+/* determine CPUfreq governors currently available
+ *
+ * may be modified by modprobe'ing or rmmod'ing other governors. Please
+ * free allocated memory by calling cpufreq_put_available_governors
+ * after use.
+ */
+
+
+struct cpufreq_available_governors
+*cpufreq_get_available_governors(unsigned int cpu);
+
+void cpufreq_put_available_governors(
+ struct cpufreq_available_governors *first);
+
+
+/* determine CPU frequency states available
+ *
+ * Only present on _some_ ->target() cpufreq drivers. For information purposes
+ * only. Please free allocated memory by calling
+ * cpufreq_put_frequencies after use.
+ */
+
+struct cpufreq_available_frequencies
+*cpufreq_get_available_frequencies(unsigned int cpu);
+
+void cpufreq_put_available_frequencies(
+ struct cpufreq_available_frequencies *first);
+
+struct cpufreq_available_frequencies
+*cpufreq_get_boost_frequencies(unsigned int cpu);
+
+void cpufreq_put_boost_frequencies(
+ struct cpufreq_available_frequencies *first);
+
+
+/* determine affected CPUs
+ *
+ * Remember to call cpufreq_put_affected_cpus when no longer needed
+ * to avoid memory leakage, please.
+ */
+
+struct cpufreq_affected_cpus *cpufreq_get_affected_cpus(unsigned
+ int cpu);
+
+void cpufreq_put_affected_cpus(struct cpufreq_affected_cpus *first);
+
+
+/* determine related CPUs
+ *
+ * Remember to call cpufreq_put_related_cpus when no longer needed
+ * to avoid memory leakage, please.
+ */
+
+struct cpufreq_affected_cpus *cpufreq_get_related_cpus(unsigned
+ int cpu);
+
+void cpufreq_put_related_cpus(struct cpufreq_affected_cpus *first);
+
+
+/* determine stats for cpufreq subsystem
+ *
+ * This is not available in all kernel versions or configurations.
+ */
+
+struct cpufreq_stats *cpufreq_get_stats(unsigned int cpu,
+ unsigned long long *total_time);
+
+void cpufreq_put_stats(struct cpufreq_stats *stats);
+
+unsigned long cpufreq_get_transitions(unsigned int cpu);
+
+
+/* set new cpufreq policy
+ *
+ * Tries to set the passed policy as new policy as close as possible,
+ * but results may differ depending e.g. on governors being available.
+ */
+
+int cpufreq_set_policy(unsigned int cpu, struct cpufreq_policy *policy);
+
+
+/* modify a policy by only changing min/max freq or governor
+ *
+ * Does not check whether result is what was intended.
+ */
+
+int cpufreq_modify_policy_min(unsigned int cpu, unsigned long min_freq);
+int cpufreq_modify_policy_max(unsigned int cpu, unsigned long max_freq);
+int cpufreq_modify_policy_governor(unsigned int cpu, char *governor);
+
+
+/* set a specific frequency
+ *
+ * Does only work if userspace governor can be used and no external
+ * interference (other calls to this function or to set/modify_policy)
+ * occurs. Also does not work on ->range() cpufreq drivers.
+ */
+
+int cpufreq_set_frequency(unsigned int cpu,
+ unsigned long target_frequency);
+
+/*
+ * get the sysfs value from specific table
+ *
+ * Read the value with the sysfs file name from specific table. Does
+ * only work if the cpufreq driver has the specific sysfs interfaces.
+ */
+
+unsigned long cpufreq_get_sysfs_value_from_table(unsigned int cpu,
+ const char **table,
+ unsigned int index,
+ unsigned int size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _CPUFREQ_H */
diff --git a/tools/power/cpupower/lib/cpuidle.c b/tools/power/cpupower/lib/cpuidle.c
new file mode 100644
index 0000000000..479c5971aa
--- /dev/null
+++ b/tools/power/cpupower/lib/cpuidle.c
@@ -0,0 +1,379 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
+ * (C) 2011 Thomas Renninger <trenn@novell.com> Novell Inc.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "cpuidle.h"
+#include "cpupower_intern.h"
+
+/*
+ * helper function to check whether a file under "../cpuX/cpuidle/stateX/" dir
+ * exists.
+ * For example the functionality to disable c-states was introduced in later
+ * kernel versions, this function can be used to explicitly check for this
+ * feature.
+ *
+ * returns 1 if the file exists, 0 otherwise.
+ */
+static
+unsigned int cpuidle_state_file_exists(unsigned int cpu,
+ unsigned int idlestate,
+ const char *fname)
+{
+ char path[SYSFS_PATH_MAX];
+ struct stat statbuf;
+
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
+ cpu, idlestate, fname);
+ if (stat(path, &statbuf) != 0)
+ return 0;
+ return 1;
+}
+
+/*
+ * helper function to read file from /sys into given buffer
+ * fname is a relative path under "cpuX/cpuidle/stateX/" dir
+ * cstates starting with 0, C0 is not counted as cstate.
+ * This means if you want C1 info, pass 0 as idlestate param
+ */
+static
+unsigned int cpuidle_state_read_file(unsigned int cpu,
+ unsigned int idlestate,
+ const char *fname, char *buf,
+ size_t buflen)
+{
+ char path[SYSFS_PATH_MAX];
+ int fd;
+ ssize_t numread;
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
+ cpu, idlestate, fname);
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ return 0;
+
+ numread = read(fd, buf, buflen - 1);
+ if (numread < 1) {
+ close(fd);
+ return 0;
+ }
+
+ buf[numread] = '\0';
+ close(fd);
+
+ return (unsigned int) numread;
+}
+
+/*
+ * helper function to write a new value to a /sys file
+ * fname is a relative path under "../cpuX/cpuidle/cstateY/" dir
+ *
+ * Returns the number of bytes written or 0 on error
+ */
+static
+unsigned int cpuidle_state_write_file(unsigned int cpu,
+ unsigned int idlestate,
+ const char *fname,
+ const char *value, size_t len)
+{
+ char path[SYSFS_PATH_MAX];
+ int fd;
+ ssize_t numwrite;
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
+ cpu, idlestate, fname);
+
+ fd = open(path, O_WRONLY);
+ if (fd == -1)
+ return 0;
+
+ numwrite = write(fd, value, len);
+ if (numwrite < 1) {
+ close(fd);
+ return 0;
+ }
+
+ close(fd);
+
+ return (unsigned int) numwrite;
+}
+
+/* read access to files which contain one numeric value */
+
+enum idlestate_value {
+ IDLESTATE_USAGE,
+ IDLESTATE_POWER,
+ IDLESTATE_LATENCY,
+ IDLESTATE_TIME,
+ IDLESTATE_DISABLE,
+ MAX_IDLESTATE_VALUE_FILES
+};
+
+static const char *idlestate_value_files[MAX_IDLESTATE_VALUE_FILES] = {
+ [IDLESTATE_USAGE] = "usage",
+ [IDLESTATE_POWER] = "power",
+ [IDLESTATE_LATENCY] = "latency",
+ [IDLESTATE_TIME] = "time",
+ [IDLESTATE_DISABLE] = "disable",
+};
+
+static
+unsigned long long cpuidle_state_get_one_value(unsigned int cpu,
+ unsigned int idlestate,
+ enum idlestate_value which)
+{
+ unsigned long long value;
+ unsigned int len;
+ char linebuf[MAX_LINE_LEN];
+ char *endp;
+
+ if (which >= MAX_IDLESTATE_VALUE_FILES)
+ return 0;
+
+ len = cpuidle_state_read_file(cpu, idlestate,
+ idlestate_value_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return 0;
+
+ value = strtoull(linebuf, &endp, 0);
+
+ if (endp == linebuf || errno == ERANGE)
+ return 0;
+
+ return value;
+}
+
+/* read access to files which contain one string */
+
+enum idlestate_string {
+ IDLESTATE_DESC,
+ IDLESTATE_NAME,
+ MAX_IDLESTATE_STRING_FILES
+};
+
+static const char *idlestate_string_files[MAX_IDLESTATE_STRING_FILES] = {
+ [IDLESTATE_DESC] = "desc",
+ [IDLESTATE_NAME] = "name",
+};
+
+
+static char *cpuidle_state_get_one_string(unsigned int cpu,
+ unsigned int idlestate,
+ enum idlestate_string which)
+{
+ char linebuf[MAX_LINE_LEN];
+ char *result;
+ unsigned int len;
+
+ if (which >= MAX_IDLESTATE_STRING_FILES)
+ return NULL;
+
+ len = cpuidle_state_read_file(cpu, idlestate,
+ idlestate_string_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ result = strdup(linebuf);
+ if (result == NULL)
+ return NULL;
+
+ if (result[strlen(result) - 1] == '\n')
+ result[strlen(result) - 1] = '\0';
+
+ return result;
+}
+
+/*
+ * Returns:
+ * 1 if disabled
+ * 0 if enabled
+ * -1 if idlestate is not available
+ * -2 if disabling is not supported by the kernel
+ */
+int cpuidle_is_state_disabled(unsigned int cpu,
+ unsigned int idlestate)
+{
+ if (cpuidle_state_count(cpu) <= idlestate)
+ return -1;
+
+ if (!cpuidle_state_file_exists(cpu, idlestate,
+ idlestate_value_files[IDLESTATE_DISABLE]))
+ return -2;
+ return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_DISABLE);
+}
+
+/*
+ * Pass 1 as last argument to disable or 0 to enable the state
+ * Returns:
+ * 0 on success
+ * negative values on error, for example:
+ * -1 if idlestate is not available
+ * -2 if disabling is not supported by the kernel
+ * -3 No write access to disable/enable C-states
+ */
+int cpuidle_state_disable(unsigned int cpu,
+ unsigned int idlestate,
+ unsigned int disable)
+{
+ char value[SYSFS_PATH_MAX];
+ int bytes_written;
+
+ if (cpuidle_state_count(cpu) <= idlestate)
+ return -1;
+
+ if (!cpuidle_state_file_exists(cpu, idlestate,
+ idlestate_value_files[IDLESTATE_DISABLE]))
+ return -2;
+
+ snprintf(value, SYSFS_PATH_MAX, "%u", disable);
+
+ bytes_written = cpuidle_state_write_file(cpu, idlestate, "disable",
+ value, sizeof(disable));
+ if (bytes_written)
+ return 0;
+ return -3;
+}
+
+unsigned long cpuidle_state_latency(unsigned int cpu,
+ unsigned int idlestate)
+{
+ return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_LATENCY);
+}
+
+unsigned long cpuidle_state_usage(unsigned int cpu,
+ unsigned int idlestate)
+{
+ return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_USAGE);
+}
+
+unsigned long long cpuidle_state_time(unsigned int cpu,
+ unsigned int idlestate)
+{
+ return cpuidle_state_get_one_value(cpu, idlestate, IDLESTATE_TIME);
+}
+
+char *cpuidle_state_name(unsigned int cpu, unsigned int idlestate)
+{
+ return cpuidle_state_get_one_string(cpu, idlestate, IDLESTATE_NAME);
+}
+
+char *cpuidle_state_desc(unsigned int cpu, unsigned int idlestate)
+{
+ return cpuidle_state_get_one_string(cpu, idlestate, IDLESTATE_DESC);
+}
+
+/*
+ * Returns number of supported C-states of CPU core cpu
+ * Negativ in error case
+ * Zero if cpuidle does not export any C-states
+ */
+unsigned int cpuidle_state_count(unsigned int cpu)
+{
+ char file[SYSFS_PATH_MAX];
+ struct stat statbuf;
+ int idlestates = 1;
+
+
+ snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpuidle");
+ if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+ return 0;
+
+ snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpu%u/cpuidle/state0", cpu);
+ if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+ return 0;
+
+ while (stat(file, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
+ snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU
+ "cpu%u/cpuidle/state%d", cpu, idlestates);
+ idlestates++;
+ }
+ idlestates--;
+ return idlestates;
+}
+
+/* CPUidle general /sys/devices/system/cpu/cpuidle/ sysfs access ********/
+
+/*
+ * helper function to read file from /sys into given buffer
+ * fname is a relative path under "cpu/cpuidle/" dir
+ */
+static unsigned int sysfs_cpuidle_read_file(const char *fname, char *buf,
+ size_t buflen)
+{
+ char path[SYSFS_PATH_MAX];
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpuidle/%s", fname);
+
+ return cpupower_read_sysfs(path, buf, buflen);
+}
+
+
+
+/* read access to files which contain one string */
+
+enum cpuidle_string {
+ CPUIDLE_GOVERNOR,
+ CPUIDLE_GOVERNOR_RO,
+ CPUIDLE_DRIVER,
+ MAX_CPUIDLE_STRING_FILES
+};
+
+static const char *cpuidle_string_files[MAX_CPUIDLE_STRING_FILES] = {
+ [CPUIDLE_GOVERNOR] = "current_governor",
+ [CPUIDLE_GOVERNOR_RO] = "current_governor_ro",
+ [CPUIDLE_DRIVER] = "current_driver",
+};
+
+
+static char *sysfs_cpuidle_get_one_string(enum cpuidle_string which)
+{
+ char linebuf[MAX_LINE_LEN];
+ char *result;
+ unsigned int len;
+
+ if (which >= MAX_CPUIDLE_STRING_FILES)
+ return NULL;
+
+ len = sysfs_cpuidle_read_file(cpuidle_string_files[which],
+ linebuf, sizeof(linebuf));
+ if (len == 0)
+ return NULL;
+
+ result = strdup(linebuf);
+ if (result == NULL)
+ return NULL;
+
+ if (result[strlen(result) - 1] == '\n')
+ result[strlen(result) - 1] = '\0';
+
+ return result;
+}
+
+char *cpuidle_get_governor(void)
+{
+ char *tmp = sysfs_cpuidle_get_one_string(CPUIDLE_GOVERNOR_RO);
+ if (!tmp)
+ return sysfs_cpuidle_get_one_string(CPUIDLE_GOVERNOR);
+ else
+ return tmp;
+}
+
+char *cpuidle_get_driver(void)
+{
+ return sysfs_cpuidle_get_one_string(CPUIDLE_DRIVER);
+}
+/* CPUidle idlestate specific /sys/devices/system/cpu/cpuX/cpuidle/ access */
diff --git a/tools/power/cpupower/lib/cpuidle.h b/tools/power/cpupower/lib/cpuidle.h
new file mode 100644
index 0000000000..2e10fead2e
--- /dev/null
+++ b/tools/power/cpupower/lib/cpuidle.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __CPUPOWER_CPUIDLE_H__
+#define __CPUPOWER_CPUIDLE_H__
+
+int cpuidle_is_state_disabled(unsigned int cpu,
+ unsigned int idlestate);
+int cpuidle_state_disable(unsigned int cpu, unsigned int idlestate,
+ unsigned int disable);
+unsigned long cpuidle_state_latency(unsigned int cpu,
+ unsigned int idlestate);
+unsigned long cpuidle_state_usage(unsigned int cpu,
+ unsigned int idlestate);
+unsigned long long cpuidle_state_time(unsigned int cpu,
+ unsigned int idlestate);
+char *cpuidle_state_name(unsigned int cpu,
+ unsigned int idlestate);
+char *cpuidle_state_desc(unsigned int cpu,
+ unsigned int idlestate);
+unsigned int cpuidle_state_count(unsigned int cpu);
+
+char *cpuidle_get_governor(void);
+char *cpuidle_get_driver(void);
+
+#endif /* __CPUPOWER_HELPERS_SYSFS_H__ */
diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c
new file mode 100644
index 0000000000..7a2ef691b2
--- /dev/null
+++ b/tools/power/cpupower/lib/cpupower.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de>
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include "cpupower.h"
+#include "cpupower_intern.h"
+
+int is_valid_path(const char *path)
+{
+ if (access(path, F_OK) == -1)
+ return 0;
+ return 1;
+}
+
+unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen)
+{
+ ssize_t numread;
+ int fd;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ return 0;
+
+ numread = read(fd, buf, buflen - 1);
+ if (numread < 1) {
+ close(fd);
+ return 0;
+ }
+
+ buf[numread] = '\0';
+ close(fd);
+
+ return (unsigned int) numread;
+}
+
+unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen)
+{
+ ssize_t numwritten;
+ int fd;
+
+ fd = open(path, O_WRONLY);
+ if (fd == -1)
+ return 0;
+
+ numwritten = write(fd, buf, buflen - 1);
+ if (numwritten < 1) {
+ perror(path);
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+
+ return (unsigned int) numwritten;
+}
+
+/*
+ * Detect whether a CPU is online
+ *
+ * Returns:
+ * 1 -> if CPU is online
+ * 0 -> if CPU is offline
+ * negative errno values in error case
+ */
+int cpupower_is_cpu_online(unsigned int cpu)
+{
+ char path[SYSFS_PATH_MAX];
+ int fd;
+ ssize_t numread;
+ unsigned long long value;
+ char linebuf[MAX_LINE_LEN];
+ char *endp;
+ struct stat statbuf;
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u", cpu);
+
+ if (stat(path, &statbuf) != 0)
+ return 0;
+
+ /*
+ * kernel without CONFIG_HOTPLUG_CPU
+ * -> cpuX directory exists, but not cpuX/online file
+ */
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/online", cpu);
+ if (stat(path, &statbuf) != 0)
+ return 1;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ return -errno;
+
+ numread = read(fd, linebuf, MAX_LINE_LEN - 1);
+ if (numread < 1) {
+ close(fd);
+ return -EIO;
+ }
+ linebuf[numread] = '\0';
+ close(fd);
+
+ value = strtoull(linebuf, &endp, 0);
+ if (value > 1)
+ return -EINVAL;
+
+ return value;
+}
+
+/* returns -1 on failure, 0 on success */
+static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *result)
+{
+ char linebuf[MAX_LINE_LEN];
+ char *endp;
+ char path[SYSFS_PATH_MAX];
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s",
+ cpu, fname);
+ if (cpupower_read_sysfs(path, linebuf, MAX_LINE_LEN) == 0)
+ return -1;
+ *result = strtol(linebuf, &endp, 0);
+ if (endp == linebuf || errno == ERANGE)
+ return -1;
+ return 0;
+}
+
+static int __compare(const void *t1, const void *t2)
+{
+ struct cpuid_core_info *top1 = (struct cpuid_core_info *)t1;
+ struct cpuid_core_info *top2 = (struct cpuid_core_info *)t2;
+ if (top1->pkg < top2->pkg)
+ return -1;
+ else if (top1->pkg > top2->pkg)
+ return 1;
+ else if (top1->core < top2->core)
+ return -1;
+ else if (top1->core > top2->core)
+ return 1;
+ else if (top1->cpu < top2->cpu)
+ return -1;
+ else if (top1->cpu > top2->cpu)
+ return 1;
+ else
+ return 0;
+}
+
+/*
+ * Returns amount of cpus, negative on error, cpu_top must be
+ * passed to cpu_topology_release to free resources
+ *
+ * Array is sorted after ->pkg, ->core, then ->cpu
+ */
+int get_cpu_topology(struct cpupower_topology *cpu_top)
+{
+ int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF);
+
+ cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus);
+ if (cpu_top->core_info == NULL)
+ return -ENOMEM;
+ cpu_top->pkgs = cpu_top->cores = 0;
+ for (cpu = 0; cpu < cpus; cpu++) {
+ cpu_top->core_info[cpu].cpu = cpu;
+ cpu_top->core_info[cpu].is_online = cpupower_is_cpu_online(cpu);
+ if(sysfs_topology_read_file(
+ cpu,
+ "physical_package_id",
+ &(cpu_top->core_info[cpu].pkg)) < 0) {
+ cpu_top->core_info[cpu].pkg = -1;
+ cpu_top->core_info[cpu].core = -1;
+ continue;
+ }
+ if(sysfs_topology_read_file(
+ cpu,
+ "core_id",
+ &(cpu_top->core_info[cpu].core)) < 0) {
+ cpu_top->core_info[cpu].pkg = -1;
+ cpu_top->core_info[cpu].core = -1;
+ continue;
+ }
+ }
+
+ qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info),
+ __compare);
+
+ /* Count the number of distinct pkgs values. This works
+ because the primary sort of the core_info struct was just
+ done by pkg value. */
+ last_pkg = cpu_top->core_info[0].pkg;
+ for(cpu = 1; cpu < cpus; cpu++) {
+ if (cpu_top->core_info[cpu].pkg != last_pkg &&
+ cpu_top->core_info[cpu].pkg != -1) {
+
+ last_pkg = cpu_top->core_info[cpu].pkg;
+ cpu_top->pkgs++;
+ }
+ }
+ if (!(cpu_top->core_info[0].pkg == -1))
+ cpu_top->pkgs++;
+
+ /* Intel's cores count is not consecutively numbered, there may
+ * be a core_id of 3, but none of 2. Assume there always is 0
+ * Get amount of cores by counting duplicates in a package
+ for (cpu = 0; cpu_top->core_info[cpu].pkg = 0 && cpu < cpus; cpu++) {
+ if (cpu_top->core_info[cpu].core == 0)
+ cpu_top->cores++;
+ */
+ return cpus;
+}
+
+void cpu_topology_release(struct cpupower_topology cpu_top)
+{
+ free(cpu_top.core_info);
+}
diff --git a/tools/power/cpupower/lib/cpupower.h b/tools/power/cpupower/lib/cpupower.h
new file mode 100644
index 0000000000..e4e4292eac
--- /dev/null
+++ b/tools/power/cpupower/lib/cpupower.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __CPUPOWER_CPUPOWER_H__
+#define __CPUPOWER_CPUPOWER_H__
+
+struct cpupower_topology {
+ /* Amount of CPU cores, packages and threads per core in the system */
+ unsigned int cores;
+ unsigned int pkgs;
+ unsigned int threads; /* per core */
+
+ /* Array gets mallocated with cores entries, holding per core info */
+ struct cpuid_core_info *core_info;
+};
+
+struct cpuid_core_info {
+ int pkg;
+ int core;
+ int cpu;
+
+ /* flags */
+ unsigned int is_online:1;
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int get_cpu_topology(struct cpupower_topology *cpu_top);
+void cpu_topology_release(struct cpupower_topology cpu_top);
+int cpupower_is_cpu_online(unsigned int cpu);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/tools/power/cpupower/lib/cpupower_intern.h b/tools/power/cpupower/lib/cpupower_intern.h
new file mode 100644
index 0000000000..5fdb8620d4
--- /dev/null
+++ b/tools/power/cpupower/lib/cpupower_intern.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#define PATH_TO_CPU "/sys/devices/system/cpu/"
+
+#ifndef MAX_LINE_LEN
+#define MAX_LINE_LEN 4096
+#endif
+
+#define SYSFS_PATH_MAX 255
+
+int is_valid_path(const char *path);
+unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen);
+unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen);
diff --git a/tools/power/cpupower/lib/powercap.c b/tools/power/cpupower/lib/powercap.c
new file mode 100644
index 0000000000..a7a59c6bac
--- /dev/null
+++ b/tools/power/cpupower/lib/powercap.c
@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * (C) 2016 SUSE Software Solutions GmbH
+ * Thomas Renninger <trenn@suse.de>
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <dirent.h>
+
+#include "powercap.h"
+
+static unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen)
+{
+ int fd;
+ ssize_t numread;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ return 0;
+
+ numread = read(fd, buf, buflen - 1);
+ if (numread < 1) {
+ close(fd);
+ return 0;
+ }
+
+ buf[numread] = '\0';
+ close(fd);
+
+ return (unsigned int) numread;
+}
+
+static int sysfs_get_enabled(char *path, int *mode)
+{
+ int fd;
+ char yes_no;
+ int ret = 0;
+
+ *mode = 0;
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1) {
+ ret = -1;
+ goto out;
+ }
+
+ if (read(fd, &yes_no, 1) != 1) {
+ ret = -1;
+ goto out_close;
+ }
+
+ if (yes_no == '1') {
+ *mode = 1;
+ goto out_close;
+ } else if (yes_no == '0') {
+ goto out_close;
+ } else {
+ ret = -1;
+ goto out_close;
+ }
+out_close:
+ close(fd);
+out:
+ return ret;
+}
+
+int powercap_get_enabled(int *mode)
+{
+ char path[SYSFS_PATH_MAX] = PATH_TO_POWERCAP "/intel-rapl/enabled";
+
+ return sysfs_get_enabled(path, mode);
+}
+
+/*
+ * Hardcoded, because rapl is the only powercap implementation
+- * this needs to get more generic if more powercap implementations
+ * should show up
+ */
+int powercap_get_driver(char *driver, int buflen)
+{
+ char file[SYSFS_PATH_MAX] = PATH_TO_RAPL;
+
+ struct stat statbuf;
+
+ if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) {
+ driver = "";
+ return -1;
+ } else if (buflen > 10) {
+ strcpy(driver, "intel-rapl");
+ return 0;
+ } else
+ return -1;
+}
+
+enum powercap_get64 {
+ GET_ENERGY_UJ,
+ GET_MAX_ENERGY_RANGE_UJ,
+ GET_POWER_UW,
+ GET_MAX_POWER_RANGE_UW,
+ MAX_GET_64_FILES
+};
+
+static const char *powercap_get64_files[MAX_GET_64_FILES] = {
+ [GET_POWER_UW] = "power_uw",
+ [GET_MAX_POWER_RANGE_UW] = "max_power_range_uw",
+ [GET_ENERGY_UJ] = "energy_uj",
+ [GET_MAX_ENERGY_RANGE_UJ] = "max_energy_range_uj",
+};
+
+static int sysfs_powercap_get64_val(struct powercap_zone *zone,
+ enum powercap_get64 which,
+ uint64_t *val)
+{
+ char file[SYSFS_PATH_MAX] = PATH_TO_POWERCAP "/";
+ int ret;
+ char buf[MAX_LINE_LEN];
+
+ strcat(file, zone->sys_name);
+ strcat(file, "/");
+ strcat(file, powercap_get64_files[which]);
+
+ ret = sysfs_read_file(file, buf, MAX_LINE_LEN);
+ if (ret < 0)
+ return ret;
+ if (ret == 0)
+ return -1;
+
+ *val = strtoll(buf, NULL, 10);
+ return 0;
+}
+
+int powercap_get_max_energy_range_uj(struct powercap_zone *zone, uint64_t *val)
+{
+ return sysfs_powercap_get64_val(zone, GET_MAX_ENERGY_RANGE_UJ, val);
+}
+
+int powercap_get_energy_uj(struct powercap_zone *zone, uint64_t *val)
+{
+ return sysfs_powercap_get64_val(zone, GET_ENERGY_UJ, val);
+}
+
+int powercap_get_max_power_range_uw(struct powercap_zone *zone, uint64_t *val)
+{
+ return sysfs_powercap_get64_val(zone, GET_MAX_POWER_RANGE_UW, val);
+}
+
+int powercap_get_power_uw(struct powercap_zone *zone, uint64_t *val)
+{
+ return sysfs_powercap_get64_val(zone, GET_POWER_UW, val);
+}
+
+int powercap_zone_get_enabled(struct powercap_zone *zone, int *mode)
+{
+ char path[SYSFS_PATH_MAX] = PATH_TO_POWERCAP;
+
+ if ((strlen(PATH_TO_POWERCAP) + strlen(zone->sys_name)) +
+ strlen("/enabled") + 1 >= SYSFS_PATH_MAX)
+ return -1;
+
+ strcat(path, "/");
+ strcat(path, zone->sys_name);
+ strcat(path, "/enabled");
+
+ return sysfs_get_enabled(path, mode);
+}
+
+int powercap_zone_set_enabled(struct powercap_zone *zone, int mode)
+{
+ /* To be done if needed */
+ return 0;
+}
+
+
+int powercap_read_zone(struct powercap_zone *zone)
+{
+ struct dirent *dent;
+ DIR *zone_dir;
+ char sysfs_dir[SYSFS_PATH_MAX] = PATH_TO_POWERCAP;
+ struct powercap_zone *child_zone;
+ char file[SYSFS_PATH_MAX] = PATH_TO_POWERCAP;
+ int i, ret = 0;
+ uint64_t val = 0;
+
+ strcat(sysfs_dir, "/");
+ strcat(sysfs_dir, zone->sys_name);
+
+ zone_dir = opendir(sysfs_dir);
+ if (zone_dir == NULL)
+ return -1;
+
+ strcat(file, "/");
+ strcat(file, zone->sys_name);
+ strcat(file, "/name");
+ sysfs_read_file(file, zone->name, MAX_LINE_LEN);
+ if (zone->parent)
+ zone->tree_depth = zone->parent->tree_depth + 1;
+ ret = powercap_get_energy_uj(zone, &val);
+ if (ret == 0)
+ zone->has_energy_uj = 1;
+ ret = powercap_get_power_uw(zone, &val);
+ if (ret == 0)
+ zone->has_power_uw = 1;
+
+ while ((dent = readdir(zone_dir)) != NULL) {
+ struct stat st;
+
+ if (strcmp(dent->d_name, ".") == 0 || strcmp(dent->d_name, "..") == 0)
+ continue;
+
+ if (stat(dent->d_name, &st) != 0 || !S_ISDIR(st.st_mode))
+ if (fstatat(dirfd(zone_dir), dent->d_name, &st, 0) < 0)
+ continue;
+
+ if (strncmp(dent->d_name, "intel-rapl:", 11) != 0)
+ continue;
+
+ child_zone = calloc(1, sizeof(struct powercap_zone));
+ if (child_zone == NULL)
+ return -1;
+ for (i = 0; i < POWERCAP_MAX_CHILD_ZONES; i++) {
+ if (zone->children[i] == NULL) {
+ zone->children[i] = child_zone;
+ break;
+ }
+ if (i == POWERCAP_MAX_CHILD_ZONES - 1) {
+ free(child_zone);
+ fprintf(stderr, "Reached POWERCAP_MAX_CHILD_ZONES %d\n",
+ POWERCAP_MAX_CHILD_ZONES);
+ return -1;
+ }
+ }
+ strcpy(child_zone->sys_name, zone->sys_name);
+ strcat(child_zone->sys_name, "/");
+ strcat(child_zone->sys_name, dent->d_name);
+ child_zone->parent = zone;
+ if (zone->tree_depth >= POWERCAP_MAX_TREE_DEPTH) {
+ fprintf(stderr, "Maximum zone hierarchy depth[%d] reached\n",
+ POWERCAP_MAX_TREE_DEPTH);
+ ret = -1;
+ break;
+ }
+ powercap_read_zone(child_zone);
+ }
+ closedir(zone_dir);
+ return ret;
+}
+
+struct powercap_zone *powercap_init_zones(void)
+{
+ int enabled;
+ struct powercap_zone *root_zone;
+ int ret;
+ char file[SYSFS_PATH_MAX] = PATH_TO_RAPL "/enabled";
+
+ ret = sysfs_get_enabled(file, &enabled);
+
+ if (ret)
+ return NULL;
+
+ if (!enabled)
+ return NULL;
+
+ root_zone = calloc(1, sizeof(struct powercap_zone));
+ if (!root_zone)
+ return NULL;
+
+ strcpy(root_zone->sys_name, "intel-rapl/intel-rapl:0");
+
+ powercap_read_zone(root_zone);
+
+ return root_zone;
+}
+
+/* Call function *f on the passed zone and all its children */
+
+int powercap_walk_zones(struct powercap_zone *zone,
+ int (*f)(struct powercap_zone *zone))
+{
+ int i, ret;
+
+ if (!zone)
+ return -1;
+
+ ret = f(zone);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < POWERCAP_MAX_CHILD_ZONES; i++) {
+ if (zone->children[i] != NULL)
+ powercap_walk_zones(zone->children[i], f);
+ }
+ return 0;
+}
diff --git a/tools/power/cpupower/lib/powercap.h b/tools/power/cpupower/lib/powercap.h
new file mode 100644
index 0000000000..c049c109f2
--- /dev/null
+++ b/tools/power/cpupower/lib/powercap.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * (C) 2016 SUSE Software Solutions GmbH
+ * Thomas Renninger <trenn@suse.de>
+ */
+
+#ifndef __CPUPOWER_RAPL_H__
+#define __CPUPOWER_RAPL_H__
+
+#define PATH_TO_POWERCAP "/sys/devices/virtual/powercap"
+#define PATH_TO_RAPL "/sys/devices/virtual/powercap/intel-rapl"
+#define PATH_TO_RAPL_CLASS "/sys/devices/virtual/powercap/intel-rapl"
+
+#define POWERCAP_MAX_CHILD_ZONES 10
+#define POWERCAP_MAX_TREE_DEPTH 10
+
+#define MAX_LINE_LEN 4096
+#define SYSFS_PATH_MAX 255
+
+#include <stdint.h>
+
+struct powercap_zone {
+ char name[MAX_LINE_LEN];
+ /*
+ * sys_name relative to PATH_TO_POWERCAP,
+ * do not forget the / in between
+ */
+ char sys_name[SYSFS_PATH_MAX];
+ int tree_depth;
+ struct powercap_zone *parent;
+ struct powercap_zone *children[POWERCAP_MAX_CHILD_ZONES];
+ /* More possible caps or attributes to be added? */
+ uint32_t has_power_uw:1,
+ has_energy_uj:1;
+
+};
+
+int powercap_walk_zones(struct powercap_zone *zone,
+ int (*f)(struct powercap_zone *zone));
+
+struct powercap_zone *powercap_init_zones(void);
+int powercap_get_enabled(int *mode);
+int powercap_set_enabled(int mode);
+int powercap_get_driver(char *driver, int buflen);
+
+int powercap_get_max_energy_range_uj(struct powercap_zone *zone, uint64_t *val);
+int powercap_get_energy_uj(struct powercap_zone *zone, uint64_t *val);
+int powercap_get_max_power_range_uw(struct powercap_zone *zone, uint64_t *val);
+int powercap_get_power_uw(struct powercap_zone *zone, uint64_t *val);
+int powercap_zone_get_enabled(struct powercap_zone *zone, int *mode);
+int powercap_zone_set_enabled(struct powercap_zone *zone, int mode);
+
+
+#endif /* __CPUPOWER_RAPL_H__ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 17:30:37 +0000