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Diffstat (limited to 'lib/igt_pm.c')
| -rw-r--r-- | lib/igt_pm.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/lib/igt_pm.c b/lib/igt_pm.c new file mode 100644 index 00000000..b1b5503c --- /dev/null +++ b/lib/igt_pm.c @@ -0,0 +1,233 @@ +/* + * Copyright © 2013, 2015 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Paulo Zanoni <paulo.r.zanoni@intel.com> + * David Weinehall <david.weinehall@intel.com> + * + */ +#include <fcntl.h> +#include <stdio.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include "drmtest.h" +#include "igt_pm.h" + +enum { + POLICY_UNKNOWN = -1, + POLICY_MAX_PERFORMANCE = 0, + POLICY_MEDIUM_POWER = 1, + POLICY_MIN_POWER = 2 +}; + +#define MAX_PERFORMANCE_STR "max_performance\n" +#define MEDIUM_POWER_STR "medium_power\n" +#define MIN_POWER_STR "min_power\n" +/* Remember to fix this if adding longer strings */ +#define MAX_POLICY_STRLEN strlen(MAX_PERFORMANCE_STR) + +/** + * SECTION:igt_pm + * @short_description: Power Management related helpers + * @title: Power Management + * @include: igt.h + * + * This library provides various helpers to enable power management for, + * and in some cases subsequently allow restoring the old behaviour of, + * various external components that by default are set up in a way + * that interferes with the testing of our power management functionality. + */ +/** + * igt_pm_enable_audio_runtime_pm: + * + * We know that if we don't enable audio runtime PM, snd_hda_intel will never + * release its power well refcount, and we'll never reach the LPSP state. + * There's no guarantee that it will release the power well if we enable + * runtime PM, but at least we can try. + * + * We don't have any assertions on open since the user may not even have + * snd_hda_intel loaded, which is not a problem. + */ +void igt_pm_enable_audio_runtime_pm(void) +{ + int fd; + + fd = open("/sys/module/snd_hda_intel/parameters/power_save", O_WRONLY); + if (fd >= 0) { + igt_assert_eq(write(fd, "1\n", 2), 2); + close(fd); + } + fd = open("/sys/bus/pci/devices/0000:00:03.0/power/control", O_WRONLY); + if (fd >= 0) { + igt_assert_eq(write(fd, "auto\n", 5), 5); + close(fd); + } + /* Give some time for it to react. */ + sleep(1); +} + +/** + * igt_pm_enable_sata_link_power_management: + * + * Enable the min_power policy for SATA link power management. + * Without this we cannot reach deep runtime power states. + * + * We don't have any assertions on open since the system might not have + * a SATA host. + * + * Returns: + * An opaque pointer to the data needed to restore the default values + * after the test has terminated, or NULL if SATA link power management + * is not supported. This pointer should be freed when no longer used + * (typically after having called restore_sata_link_power_management()). + */ +int8_t *igt_pm_enable_sata_link_power_management(void) +{ + int fd, i; + ssize_t len; + char *buf; + char *file_name; + int8_t *link_pm_policies = NULL; + + file_name = malloc(PATH_MAX); + buf = malloc(MAX_POLICY_STRLEN + 1); + + for (i = 0; ; i++) { + int8_t policy; + + snprintf(file_name, PATH_MAX, + "/sys/class/scsi_host/host%d/link_power_management_policy", + i); + + fd = open(file_name, O_RDWR); + if (fd < 0) + break; + + len = read(fd, buf, MAX_POLICY_STRLEN); + buf[len] = '\0'; + + if (!strncmp(MAX_PERFORMANCE_STR, buf, + strlen(MAX_PERFORMANCE_STR))) + policy = POLICY_MAX_PERFORMANCE; + else if (!strncmp(MEDIUM_POWER_STR, buf, + strlen(MEDIUM_POWER_STR))) + policy = POLICY_MEDIUM_POWER; + else if (!strncmp(MIN_POWER_STR, buf, + strlen(MIN_POWER_STR))) + policy = POLICY_MIN_POWER; + else + policy = POLICY_UNKNOWN; + + if (!(i % 256)) + link_pm_policies = realloc(link_pm_policies, + (i / 256 + 1) * 256 + 1); + + link_pm_policies[i] = policy; + link_pm_policies[i + 1] = 0; + + /* If the policy is something we don't know about, + * don't touch it, since we might potentially break things. + * And we obviously don't need to touch anything if the + * setting is already correct... + */ + if (policy != POLICY_UNKNOWN && + policy != POLICY_MIN_POWER) { + lseek(fd, 0, SEEK_SET); + igt_assert_eq(write(fd, MIN_POWER_STR, + strlen(MIN_POWER_STR)), + strlen(MIN_POWER_STR)); + } + close(fd); + } + free(buf); + free(file_name); + + return link_pm_policies; +} + +/** + * igt_pm_restore_sata_link_power_management: + * @pm_data: An opaque pointer with saved link PM policies; + * If NULL is passed we force enable the "max_performance" policy. + * + * Restore the link power management policies to the values + * prior to enabling min_power. + * + * Caveat: If the system supports hotplugging and hotplugging takes + * place during our testing so that the hosts change numbers + * we might restore the settings to the wrong hosts. + */ +void igt_pm_restore_sata_link_power_management(int8_t *pm_data) +{ + int fd, i; + char *file_name; + + /* Disk runtime PM policies. */ + file_name = malloc(PATH_MAX); + for (i = 0; ; i++) { + int8_t policy; + + if (!pm_data) + policy = POLICY_MAX_PERFORMANCE; + else if (pm_data[i] == POLICY_UNKNOWN) + continue; + else + policy = pm_data[i]; + + snprintf(file_name, PATH_MAX, + "/sys/class/scsi_host/host%d/link_power_management_policy", + i); + + fd = open(file_name, O_WRONLY); + if (fd < 0) + break; + + switch (policy) { + default: + case POLICY_MAX_PERFORMANCE: + igt_assert_eq(write(fd, MAX_PERFORMANCE_STR, + strlen(MAX_PERFORMANCE_STR)), + strlen(MAX_PERFORMANCE_STR)); + break; + + case POLICY_MEDIUM_POWER: + igt_assert_eq(write(fd, MEDIUM_POWER_STR, + strlen(MEDIUM_POWER_STR)), + strlen(MEDIUM_POWER_STR)); + break; + + case POLICY_MIN_POWER: + igt_assert_eq(write(fd, MIN_POWER_STR, + strlen(MIN_POWER_STR)), + strlen(MIN_POWER_STR)); + break; + } + + close(fd); + } + free(file_name); +} |