diff options
Diffstat (limited to 'shared/hal/power/lib')
| -rw-r--r-- | shared/hal/power/lib/libpowperf/Android.bp | 68 | ||||
| -rw-r--r-- | shared/hal/power/lib/libpowperf/COPYING.txt | 456 | ||||
| -rw-r--r-- | shared/hal/power/lib/libpowperf/Makefile | 10 | ||||
| -rw-r--r-- | shared/hal/power/lib/libpowperf/include/libpowperf.h | 42 | ||||
| -rw-r--r-- | shared/hal/power/lib/libpowperf/src/Makefile | 20 | ||||
| -rw-r--r-- | shared/hal/power/lib/libpowperf/src/perf.c | 417 | ||||
| -rw-r--r-- | shared/hal/power/lib/libpowperf/tst/Makefile | 16 | ||||
| -rw-r--r-- | shared/hal/power/lib/libpowperf/tst/tst_powperf.c | 237 |
8 files changed, 1266 insertions, 0 deletions
diff --git a/shared/hal/power/lib/libpowperf/Android.bp b/shared/hal/power/lib/libpowperf/Android.bp new file mode 100644 index 0000000..ee5a945 --- /dev/null +++ b/shared/hal/power/lib/libpowperf/Android.bp @@ -0,0 +1,68 @@ +// Copyright 2021 The Android Open Source Project + +package { + default_applicable_licenses: ["external_libpowperf_license"], +} + +// Added automatically by a large-scale-change that took the approach of +// 'apply every license found to every target'. While this makes sure we respect +// every license restriction, it may not be entirely correct. +// +// e.g. GPL in an MIT project might only apply to the contrib/ directory. +// +// Please consider splitting the single license below into multiple licenses, +// taking care not to lose any license_kind information, and overriding the +// default license using the 'licenses: [...]' property on targets as needed. +// +// For unused files, consider creating a 'fileGroup' with "//visibility:private" +// to attach the license to, and including a comment whether the files may be +// used in the current project. +// See: http://go/android-license-faq +license { + name: "external_libpowperf_license", + visibility: [":__subpackages__"], + license_kinds: [ + "SPDX-license-identifier-LGPL", + "SPDX-license-identifier-LGPL-2.1", + "SPDX-license-identifier-LGPL-3.0", + ], + license_text: [ + "COPYING.txt", + ], +} + +cc_library_headers { + name: "libpowperf_headers", + export_include_dirs: ["include"], +} + +cc_library_shared { + host_supported: true, + vendor_available: true, + product_available: true, + + target: { + linux_bionic: { + enabled: true, + }, + }, + + name: "libpowperf", + srcs: [ + "src/perf.c", + ], + + local_include_dirs: [ + "include", + ], + + export_include_dirs: ["include"], + + cflags: [ + "-g", + "-Wall", + "-Werror", + "-Wno-sign-compare", + "-Wno-unused-parameter", + ], +} diff --git a/shared/hal/power/lib/libpowperf/COPYING.txt b/shared/hal/power/lib/libpowperf/COPYING.txt new file mode 100644 index 0000000..ca4f73b --- /dev/null +++ b/shared/hal/power/lib/libpowperf/COPYING.txt @@ -0,0 +1,456 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 2.1, February 1999 + + Copyright (C) 1991, 1999 Free Software Foundation, Inc. + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the Lesser GPL. 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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN +WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY +AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU +FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR +CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE +LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING +RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A +FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF +SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH +DAMAGES. diff --git a/shared/hal/power/lib/libpowperf/Makefile b/shared/hal/power/lib/libpowperf/Makefile new file mode 100644 index 0000000..30b7407 --- /dev/null +++ b/shared/hal/power/lib/libpowperf/Makefile @@ -0,0 +1,10 @@ +TOPTARGETS := all clean + +SUBDIRS := src tst + +$(TOPTARGETS): $(SUBDIRS) + +$(SUBDIRS): + $(MAKE) -C $@ $(MAKECMDGOALS) + +.PHONY: $(TOPTARGETS) $(SUBDIRS) diff --git a/shared/hal/power/lib/libpowperf/include/libpowperf.h b/shared/hal/power/lib/libpowperf/include/libpowperf.h new file mode 100644 index 0000000..97c00f4 --- /dev/null +++ b/shared/hal/power/lib/libpowperf/include/libpowperf.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ +/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */ +#ifndef __LIBPOWPERF_H +#define __LIBPOWPERF_H + +#ifndef LIBPOWPERF_API +#define LIBPOWPERF_API __attribute__((visibility("default"))) +#endif + +#ifdef __cplusplus +extern "C" { +#endif + int powperf_set_device_min_frequency(int id, int frequency); + int powperf_get_device_min_frequency(int id); + + int powperf_set_device_max_frequency(int id, int frequency); + int powperf_get_device_max_frequency(int id); + + int powperf_set_device_frequency(int id, int frequency); + int powperf_get_device_frequency(int id); + + int powperf_set_global_latency(int latency_us); + int powperf_get_global_latency(void); + + int powperf_set_device_latency(int id, int latency_us); + int powperf_get_device_latency(int id); + int powperf_device_latency_supported(int id); + + int powperf_get_device_id(const char *device); + + int powperf_for_each_frequency(int id, int (*cb)(int frequency, void *data), + void *data); + + int powperf_for_each_device(int (*cb)(const char *device, + void *data), void *data); + + int powperf_init(void); +#ifdef __cplusplus +} +#endif + +#endif /* __LIBPOWPERF_H */ diff --git a/shared/hal/power/lib/libpowperf/src/Makefile b/shared/hal/power/lib/libpowperf/src/Makefile new file mode 100644 index 0000000..135bf3d --- /dev/null +++ b/shared/hal/power/lib/libpowperf/src/Makefile @@ -0,0 +1,20 @@ +# SPDX-License-Identifier: LGPL-2.1+ +CC=gcc +CFLAGS+=-g -Wall -Wno-unused -I../include -fPIC -Wextra -O2 +LDFLAGS=-shared +DEPS = include/libpowperf.h +OBJS = perf.o +LIB=libpowperf.so + +BINS=$(C_BINS:.c=) + +default: libpowperf.so + +%.o: %.c $(DEPS) + $(CROSS_COMPILE)$(CC) -c -o $@ $< $(CFLAGS) + +$(LIB): $(OBJS) + $(CROSS_COMPILE)$(CC) $(CFLAGS) $(OBJS) -o $@ $(LDFLAGS) + +clean: + rm -f $(OBJS) $(LIB) *~ diff --git a/shared/hal/power/lib/libpowperf/src/perf.c b/shared/hal/power/lib/libpowperf/src/perf.c new file mode 100644 index 0000000..3acdf72 --- /dev/null +++ b/shared/hal/power/lib/libpowperf/src/perf.c @@ -0,0 +1,417 @@ +// SPDX-License-Identifier: LGPL-2.1+ +// Copyright (C) 2023, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> +#define _GNU_SOURCE +#include <dirent.h> +#include <unistd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/sysinfo.h> +#include <fcntl.h> +#include <limits.h> + +#include "libpowperf.h" + +#define SYS_CLASS_DEVFREQ "/sys/class/devfreq" +#define SYS_DEVICE_SYSTEM_CPU "/sys/devices/system/cpu" +#define SYS_DEVICE_POWER_LATENCY_US "power/pm_qos_resume_latency_us" + +#define CPU_MIN_FREQ "cpufreq/scaling_min_freq" +#define CPU_MAX_FREQ "cpufreq/scaling_max_freq" +#define CPU_CUR_FREQ "cpufreq/scaling_cur_freq" +#define CPU_SET_FREQ "cpufreq/scaling_setspeed" +#define CPU_FREQUENCIES "cpufreq/scaling_available_frequencies" + +#define DEV_MIN_FREQ "min_freq" +#define DEV_MAX_FREQ "max_freq" +#define DEV_CUR_FREQ "cur_freq" +#define DEV_SET_FREQ "target_freq" +#define DEV_FREQUENCIES "available_frequencies" + +#define MAX_FREQUENCIES 30 + +#define CPU_DMA_LATENCY_DEV "/dev/cpu_dma_latency" + +static int cpu_dma_latency_fd = -1; + +/* + * The opening of a file is the most costly operation with files. So + * instead of open / read / close, let's open the file descriptor and + * keep it opened during all the life time of the library. However, we + * don't want those fd to be leaked in child processes application, so + * we should the close-on-exec flag. + */ +typedef enum { + LATENCY, + MIN_FREQ, + MAX_FREQ, + CUR_FREQ, + SET_FREQ, + MAX_ATTRS, +} perf_type_t; + +#define HZ_UNIT 1 +#define KHZ_UNIT 1000 +#define MHZ_UNIT (KHZ_UNIT * 1000) +#define GHZ_UNIT (MHZ_UNIT * 1000) + +#define KHZ_TO_MHZ(__value) (__value / 1000) +#define MHZ_TO_KHZ(__value) (__value * 1000) +#define HZ_TO_MHZ(__value) (KHZ_TO_MHZ(__value) / 1000) + +struct dev_sysfs_perf { + char device[PATH_MAX]; + int fds[MAX_ATTRS]; + int frequencies[MAX_FREQUENCIES]; + int nr_frequency; +}; + +struct attrs { + const char *attr; + mode_t mode; +}; + +static struct dev_sysfs_perf *dev_sysfs_perfs; +static int count = 0; + +static int set_device_perf(int id, perf_type_t perf_type, int value) +{ + int len = 128; + char value_str[len]; + + len = snprintf(value_str, len - 1, "%d\n", value); + if (len < 0) + return -1; + + if (pwrite(dev_sysfs_perfs[id].fds[perf_type], value_str, len, 0) < 0) + return -1; + + return 0; +} + +static int get_device_perf(int id, perf_type_t perf_type) +{ + int len = 128; + char value_str[len]; + + if (pread(dev_sysfs_perfs[id].fds[perf_type], value_str, len, 0) < 0) + return -1; + + return atoi(value_str); +} + +static int is_device_perf_supported(int id, perf_type_t perf_type) +{ + return (dev_sysfs_perfs[id].fds[perf_type] != -1); +} + +int powperf_set_device_latency(int id, int latency_us) +{ + return set_device_perf(id, LATENCY, latency_us); +} + +int powperf_get_device_latency(int id) +{ + return get_device_perf(id, LATENCY); +} + +int powperf_device_latency_supported(int id) +{ + return is_device_perf_supported(id, LATENCY); +} + +int powperf_set_device_min_frequency(int id, int frequency) +{ + return set_device_perf(id, MIN_FREQ, frequency); +} + +int powperf_get_device_min_frequency(int id) +{ + return get_device_perf(id, MIN_FREQ); +} + +int powperf_set_device_max_frequency(int id, int frequency) +{ + return set_device_perf(id, MAX_FREQ, frequency); +} + +int powperf_get_device_max_frequency(int id) +{ + return get_device_perf(id, MAX_FREQ); +} + +int powperf_set_device_frequency(int id, int frequency) +{ + return set_device_perf(id, SET_FREQ, frequency); +} + +int powperf_get_device_frequency(int id) +{ + return get_device_perf(id, CUR_FREQ); +} + +int powperf_set_global_latency(int latency_us) +{ + int ret; + + if (latency_us == INT_MAX) { + close(cpu_dma_latency_fd); + cpu_dma_latency_fd = -1; + return 0; + } + + if (cpu_dma_latency_fd == -1) { + cpu_dma_latency_fd = open(CPU_DMA_LATENCY_DEV, O_CLOEXEC | O_RDWR); + if (cpu_dma_latency_fd < 0) + return -1; + } + + ret = pwrite(cpu_dma_latency_fd, &latency_us, sizeof(latency_us), 0); + if (ret < 0) { + close(cpu_dma_latency_fd); + cpu_dma_latency_fd = -1; + } + + return 0; +} + +int powperf_get_global_latency(void) +{ + int latency_us; + int ret; + + if (cpu_dma_latency_fd == -1) + return INT_MAX; + + ret = pread(cpu_dma_latency_fd, &latency_us, sizeof(latency_us), 0); + if (ret < 0) + return ret; + + return latency_us; +} + +int powperf_get_device_id(const char *device) +{ + int i; + + for (i = 0; i < count; i++) { + if (!strcmp(device, dev_sysfs_perfs[i].device)) + return i; + } + + return -1; +} + +int powperf_for_each_device(int (*cb)(const char *device, void *data), void *data) +{ + int i; + + for (i = 0; i < count; i++) { + if (cb(dev_sysfs_perfs[i].device, data) < 0) + return -1; + } + + return 0; +} + +int powperf_for_each_frequency(int id, int (*cb)(int frequency, void *data), void *data) +{ + int i; + + for (i = 0; i < dev_sysfs_perfs[id].nr_frequency; i++) + if (cb(dev_sysfs_perfs[id].frequencies[i], data) < 0) + return -1; + + return 0; +} + +static int __dev_sysfs_get_frequencies(int dirfd, struct dev_sysfs_perf *perf, + const char *frequencies) +{ + /* + * The maximum sysfs file size is a page size. Even if the + * content would be largely under this value, we stick to the + * sysfs standard. + */ + size_t size = getpagesize(); + char buffer[size]; + char *saveptr, *token; + FILE *f; + int fd, ret = -1; + + perf->nr_frequency = 0; + + /* + * Retrieve the list of the available frequencies + */ + fd = openat(dirfd, frequencies, O_RDONLY); + if (fd < 0) + return -1; + + f = fdopen(fd, "r"); + if (!f) + goto out; + + if (!fgets(buffer, size, f)) + goto out; + + token = strtok_r(buffer, " ", &saveptr); + while (token) { + perf->frequencies[perf->nr_frequency] = atoi(token); + perf->nr_frequency++; + token = strtok_r(NULL, " \n", &saveptr); + } + + ret = 0; +out: + fclose(f); + close(fd); + + return ret; +} + +static int __dev_sysfs_perf_init(int dirfd, + struct dev_sysfs_perf *perf, + struct attrs attrs[], + const char *frequencies) +{ + int i; + + for (i = 0; i < MAX_ATTRS; i++) { + + perf->fds[i] = -1; + + if (attrs[i].attr[0] == '\0') + continue; + + perf->fds[i] = openat(dirfd, attrs[i].attr, + attrs[i].mode | O_CLOEXEC); + + /* + * We don't check if the file was correctly opened or + * not. There may be some permissions preventing us to + * access those files. For instance on Android, + * setting the current frequency is a file belonging + * to 'root' for writing but the services are uid + * 'system'. + * + * The usage of the different API will fail giving us + * the indication the feature is not accessible. + */ + } + + return __dev_sysfs_get_frequencies(dirfd, perf, frequencies); +} + +static int devfreq_sysfs_perf_init(void) +{ + DIR *dir; + int dirfd; + struct dirent *dirent; + + struct attrs attrs[] = { + [LATENCY] = { "", 0 }, + [MIN_FREQ] = { DEV_MIN_FREQ, O_RDWR }, + [MAX_FREQ] = { DEV_MAX_FREQ, O_RDWR }, + [CUR_FREQ] = { DEV_CUR_FREQ, O_RDONLY }, + [SET_FREQ] = { "", 0 } + }; + + char path[PATH_MAX]; + + dir = opendir(SYS_CLASS_DEVFREQ); + if (!dir) + return -1; + + while ((dirent = readdir(dir))) { + + if (dirent->d_name[0] == '.') + continue; + + dev_sysfs_perfs = realloc(dev_sysfs_perfs, + sizeof(*dev_sysfs_perfs) * (count + 1)); + if (!dev_sysfs_perfs) + return -1; + + sprintf(dev_sysfs_perfs[count].device, "%s", dirent->d_name); + sprintf(path, "%s/%s", SYS_CLASS_DEVFREQ, dirent->d_name); + + dirfd = open(path, O_DIRECTORY | O_CLOEXEC); + if (dirfd < 0) + return -1; + + if (__dev_sysfs_perf_init(dirfd, &dev_sysfs_perfs[count], + attrs, DEV_FREQUENCIES)) + return -1; + + close(dirfd); + + count++; + } + + closedir(dir); + + return 0; +} + +static int cpu_sysfs_perf_init(void) +{ + struct attrs attrs[] = { + [LATENCY] = { SYS_DEVICE_POWER_LATENCY_US, O_RDWR }, + [MIN_FREQ] = { CPU_MIN_FREQ, O_RDWR }, + [MAX_FREQ] = { CPU_MAX_FREQ, O_RDWR }, + [CUR_FREQ] = { CPU_CUR_FREQ, O_RDONLY }, + [SET_FREQ] = { CPU_SET_FREQ, O_WRONLY } + }; + + char *path; + + int i, nr_cpus, dirfd; + + nr_cpus = get_nprocs_conf(); + if (nr_cpus < 0) + return -1; + + dev_sysfs_perfs = malloc(sizeof(*dev_sysfs_perfs) * nr_cpus); + if (!dev_sysfs_perfs) + return -1; + + for (i = 0; i < nr_cpus; i++) { + + sprintf(dev_sysfs_perfs[i].device, "cpu%d", i); + + if (asprintf(&path, "%s/%s", SYS_DEVICE_SYSTEM_CPU, + dev_sysfs_perfs[i].device) < 0) + return -1; + + dirfd = open(path, O_DIRECTORY | O_CLOEXEC); + + free(path); + + if (dirfd < 0) + return -1; + + if (__dev_sysfs_perf_init(dirfd, &dev_sysfs_perfs[i], + attrs, CPU_FREQUENCIES)) + return -1; + + close(dirfd); + } + + count = nr_cpus; + + return 0; +} + +int powperf_init(void) +{ + if (cpu_sysfs_perf_init()) + return -1; + + if (devfreq_sysfs_perf_init()) + return -1; + + return 0; +} diff --git a/shared/hal/power/lib/libpowperf/tst/Makefile b/shared/hal/power/lib/libpowperf/tst/Makefile new file mode 100644 index 0000000..8e29db7 --- /dev/null +++ b/shared/hal/power/lib/libpowperf/tst/Makefile @@ -0,0 +1,16 @@ +# SPDX-License-Identifier: LGPL-2.1+ +CC=gcc +DEPS = ../include/libpowperf.h +LIB=../src/libpowperf.so +C_BINS=tst_powperf.c +CFLAGS=-g -Wall -Wno-unused + +BINS=$(C_BINS:.c=) + +tests: $(LIB) $(BINS) + +$(BINS): $(C_BINS) + $(CROSS_COMPILE)$(CC) $(CFLAGS) $< -o $@ -lpowperf -L../src -Wl,-rpath=../src -I../include + +clean: + rm -f $(BINS) *~ diff --git a/shared/hal/power/lib/libpowperf/tst/tst_powperf.c b/shared/hal/power/lib/libpowperf/tst/tst_powperf.c new file mode 100644 index 0000000..760c764 --- /dev/null +++ b/shared/hal/power/lib/libpowperf/tst/tst_powperf.c @@ -0,0 +1,237 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ +#include <errno.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <sys/stat.h> +#include <sys/sysinfo.h> +#include <sys/types.h> + +#include "libpowperf.h" + +static int tst_global_latency(void) +{ + const int global_latency = 1000; + int value; + + if (powperf_set_global_latency(global_latency) < 0) { + fprintf(stderr, "Failed to set the global latency\n"); + return -1; + } + + value = powperf_get_global_latency(); + if (value != global_latency) { + fprintf(stderr, "global latency mismatch %d<>%d\n", value, global_latency); + return -1; + } + + if (powperf_set_global_latency(INT_MAX) < 0) { + fprintf(stderr, "Failed to reset the global latency\n"); + return -1; + } + + value = powperf_get_global_latency(); + if (value != INT_MAX) { + fprintf(stderr, "global latency mismatch %d<>%d\n", value, INT_MAX); + return -1; + } + + return 0; +} + +static int tst_device_latency_cb(const char *device, void *data) +{ + const int latency = 500; + int id, value, prev_value; + + id = powperf_get_device_id(device); + if (id < 0) { + fprintf(stderr, "Failed to get device '%s' id\n", device); + return -1; + } + + if (!powperf_device_latency_supported(id)) + return 0; + + prev_value = powperf_get_device_latency(id); + if (prev_value < 0) { + fprintf(stderr, "Failed to get previous latency value\n"); + return -1; + } + + if (powperf_set_device_latency(id, latency)) { + fprintf(stderr, "Failed to set latency\n"); + return -1; + } + + value = powperf_get_device_latency(id); + if (value < 0) { + fprintf(stderr, "Failed to get current latency value\n"); + return -1; + } + + if (value != latency) { + fprintf(stderr, "Current and set value mismatch\n"); + return -1; + } + + if (powperf_set_device_latency(id, prev_value)) { + fprintf(stderr, "Failed to set latency to previous value\n"); + return -1; + } + + value = powperf_get_device_latency(id); + if (value < 0) { + fprintf(stderr, "Failed to get current latency value\n"); + return -1; + } + + if (value != prev_value) { + fprintf(stderr, "Failed to restore previous value\n"); + return -1; + } + + return 0; +} + +static int tst_device_latency(void) +{ + return powperf_for_each_device(tst_device_latency_cb, NULL); +} + +struct freq_cb_data { + int nr_freq; + int *freq; +}; + +static int tst_device_frequency_fill_cb(int frequency, void *data) +{ + struct freq_cb_data *fcd = (typeof(fcd))data; + + fcd->freq[fcd->nr_freq] = frequency; + fcd->nr_freq++; + + return 0; +} + +static int tst_device_frequency_cb(const char *device, void *data) +{ + struct freq_cb_data fcd = { 0 }; + int freq[64]; + int id, i; + int value; + + fcd.freq = freq; + + id = powperf_get_device_id(device); + if (id < 0) { + fprintf(stderr, "Failed to get device '%s' id\n", device); + return -1; + } + + if (powperf_for_each_frequency(id, tst_device_frequency_fill_cb, (void *)&fcd)) { + fprintf(stderr, "Failed to read frequency for device=%s id=%d\n", device, id); + return -1; + } + + /* + * For testing the range, we must set the maximum frequency + * interval first. + */ + if (powperf_set_device_min_frequency(id, fcd.freq[0]) < 0) { + fprintf(stderr, "Failed to set initial minimum frequency for device=%s\n", device); + return -1; + } + + if (powperf_set_device_max_frequency(id, fcd.freq[fcd.nr_freq - 1]) < 0) { + fprintf(stderr, "Failed to set initial maximum frequency for device=%s\n", device); + return -1; + } + + for (i = 0; i < fcd.nr_freq; i++) { + if (powperf_set_device_min_frequency(id, fcd.freq[i])) { + fprintf(stderr, "Failed to set minimum frequency for device=%s\n", device); + return -1; + } + + /* + * When setting the minimum/maxiumu frequency, there + * can be delay before being taken into account and + * reflected in sysfs. + */ + usleep(1000); + + value = powperf_get_device_min_frequency(id); + if (value != fcd.freq[i]) { + fprintf(stderr, "Minimum frequency mismatch for device=%s %d <> %d\n", + device, value, fcd.freq[i]); + return -1; + } + } + + if (powperf_set_device_min_frequency(id, fcd.freq[0]) < 0) { + fprintf(stderr, "Failed to set back minimum frequency for device=%s\n", device); + return -1; + } + + usleep(1000); + + if (powperf_get_device_min_frequency(id) != fcd.freq[0]) { + fprintf(stderr, "Unexpected minimum frequency for device=%s\n", device); + return -1; + } + + for (i = fcd.nr_freq - 1; i >= 0; i--) { + if (powperf_set_device_max_frequency(id, fcd.freq[i])) { + fprintf(stderr, "Failed to set maximum frequency for device=%s\n", device); + return -1; + } + + /* + * When setting the minimum/maxiumu frequency, there + * can be delay before being taken into account and + * reflected in sysfs. + */ + usleep(1000); + + if (powperf_get_device_max_frequency(id) != fcd.freq[i]) { + fprintf(stderr, "Maximum frequency mismatch for device=%s\n", device); + return -1; + } + } + + if (powperf_set_device_max_frequency(id, fcd.freq[fcd.nr_freq - 1]) < 0) { + fprintf(stderr, "Failed to set back maximum frequency for device=%s\n", device); + return -1; + } + + usleep(1000); + + if (powperf_get_device_max_frequency(id) != fcd.freq[fcd.nr_freq - 1]) { + fprintf(stderr, "Unexpected maximum frequency for device=%s\n", device); + return -1; + } + + return 0; +} + +static int tst_device_frequency(void) +{ + return powperf_for_each_device(tst_device_frequency_cb, NULL); +} + +int main(void) +{ + if (powperf_init()) { + fprintf(stderr, "Failed to initialize the library\n"); + return -1; + } + + printf("Global latency test: %s\n", tst_global_latency() ? "[Failed]" : "[OK]"); + printf("Device latency test: %s\n", tst_device_latency() ? "[Failed]" : "[OK]"); + printf("Device frequency test: %s\n", tst_device_frequency() ? "[Failed]" : "[OK]"); + + return 0; +} |