diff options
Diffstat (limited to 'tools/power/cpupower/lib/cpupower.c')
| -rw-r--r-- | tools/power/cpupower/lib/cpupower.c | 85 |
1 files changed, 72 insertions, 13 deletions
diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c index 9c395ec924de..d7f7ec6f151c 100644 --- a/tools/power/cpupower/lib/cpupower.c +++ b/tools/power/cpupower/lib/cpupower.c @@ -1,7 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * (C) 2004-2009 Dominik Brodowski <linux@dominikbrodowski.de> - * - * Licensed under the terms of the GNU GPL License version 2. */ #include <sys/types.h> @@ -11,14 +10,22 @@ #include <stdio.h> #include <errno.h> #include <stdlib.h> +#include <string.h> #include "cpupower.h" #include "cpupower_intern.h" -unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen) +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) { - int fd; ssize_t numread; + int fd; fd = open(path, O_RDONLY); if (fd == -1) @@ -36,6 +43,27 @@ unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen) 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 0; + } + + close(fd); + + return (unsigned int) numwritten; +} + /* * Detect whether a CPU is online * @@ -95,7 +123,7 @@ static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *re snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s", cpu, fname); - if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0) + if (cpupower_read_sysfs(path, linebuf, MAX_LINE_LEN) == 0) return -1; *result = strtol(linebuf, &endp, 0); if (endp == linebuf || errno == ERANGE) @@ -123,15 +151,25 @@ static int __compare(const void *t1, const void *t2) return 0; } +static int __compare_core_cpu_list(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; + + return strcmp(top1->core_cpu_list, top2->core_cpu_list); +} + /* * 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 + * Array is sorted after ->cpu_smt_list ->pkg, ->core */ int get_cpu_topology(struct cpupower_topology *cpu_top) { int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF); + char path[SYSFS_PATH_MAX]; + char *last_cpu_list; cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus); if (cpu_top->core_info == NULL) @@ -156,6 +194,34 @@ int get_cpu_topology(struct cpupower_topology *cpu_top) cpu_top->core_info[cpu].core = -1; continue; } + if (cpu_top->core_info[cpu].core == -1) { + strncpy(cpu_top->core_info[cpu].core_cpu_list, "-1", CPULIST_BUFFER); + continue; + } + snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s", + cpu, "core_cpus_list"); + if (cpupower_read_sysfs( + path, + cpu_top->core_info[cpu].core_cpu_list, + CPULIST_BUFFER) < 1) { + printf("Warning CPU%u has a 0 size core_cpus_list string", cpu); + } + } + + /* Count the number of distinct cpu lists to get the physical core + * count. + */ + qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info), + __compare_core_cpu_list); + + last_cpu_list = cpu_top->core_info[0].core_cpu_list; + cpu_top->cores = 1; + for (cpu = 1; cpu < cpus; cpu++) { + if (strcmp(cpu_top->core_info[cpu].core_cpu_list, last_cpu_list) != 0 && + cpu_top->core_info[cpu].pkg != -1) { + last_cpu_list = cpu_top->core_info[cpu].core_cpu_list; + cpu_top->cores++; + } } qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info), @@ -176,13 +242,6 @@ int get_cpu_topology(struct cpupower_topology *cpu_top) 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; } |