From c2294c1496b7169d5b14c2fa27526ba35da9f5ac Mon Sep 17 00:00:00 2001 From: Thomas Renninger Date: Wed, 23 Nov 2022 12:18:09 +0100 Subject: cpupower: Introduce powercap intel-rapl library and powercap-info command Read out powercap zone information via: cpupower powercap-info and show the zone hierarchy to the user: ./cpupower powercap-info Driver: intel-rapl Powercap domain hierarchy: Zone: package-0 (enabled) Power consumption can be monitored in micro Watts Zone: core (disabled) Power consumption can be monitored in micro Watts Zone: uncore (disabled) Power consumption can be monitored in micro Watts Zone: dram (disabled) Power consumption can be monitored in micro Watts There is a dummy -a option for powercap-info which can/should be used to show more detailed info later. Like that other args can be added easily later as well. A enable/disable option via powercap-set subcommand is also an enhancement for later. Also not all RAPL domains are shown. The func walking through RAPL subdomains is restricted and hardcoded to: "intel-rapl/intel-rapl:0" On my system above powercap domains map to: intel-rapl/intel-rapl:0 -> pack (age-0) intel-rapl/intel-rapl:0/intel-rapl:0:0 -> core intel-rapl/intel-rapl:0/intel-rapl:0:1 -> uncore Missing ones on my system are: intel-rapl-mmio/intel-rapl-mmio:0 -> pack (age-0) intel-rapl/intel-rapl:1 -> psys This could get enhanced in: struct powercap_zone *powercap_init_zones() and adopted to walk through all intel-rapl zones, but also to other powercap drivers like dtpm (Dynamic Thermal Power Management framework), cmp with: drivers/powercap/dtpm_* Signed-off-by: Thomas Renninger CC: Shuah Khan Signed-off-by: Shuah Khan --- tools/power/cpupower/lib/powercap.c | 290 ++++++++++++++++++++++++++++++++++++ 1 file changed, 290 insertions(+) create mode 100644 tools/power/cpupower/lib/powercap.c (limited to 'tools/power/cpupower/lib/powercap.c') diff --git a/tools/power/cpupower/lib/powercap.c b/tools/power/cpupower/lib/powercap.c new file mode 100644 index 000000000000..0ce29ee4c2e4 --- /dev/null +++ b/tools/power/cpupower/lib/powercap.c @@ -0,0 +1,290 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * (C) 2016 SUSE Software Solutions GmbH + * Thomas Renninger + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#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; + + *mode = 0; + + fd = open(path, O_RDONLY); + if (fd == -1) + return -1; + + if (read(fd, &yes_no, 1) != 1) { + close(fd); + return -1; + } + + if (yes_no == '1') { + *mode = 1; + return 0; + } else if (yes_no == '0') { + return 0; + } + return -1; +} + +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; +} -- cgit v1.2.3