480 lines
9.1 KiB
C
480 lines
9.1 KiB
C
#include "util.h"
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#include <api/fs/fs.h>
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#include "../perf.h"
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#include "cpumap.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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static struct cpu_map *cpu_map__default_new(void)
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{
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struct cpu_map *cpus;
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int nr_cpus;
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nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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if (nr_cpus < 0)
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return NULL;
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cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
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if (cpus != NULL) {
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int i;
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for (i = 0; i < nr_cpus; ++i)
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cpus->map[i] = i;
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cpus->nr = nr_cpus;
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}
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return cpus;
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}
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static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
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{
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size_t payload_size = nr_cpus * sizeof(int);
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struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
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if (cpus != NULL) {
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cpus->nr = nr_cpus;
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memcpy(cpus->map, tmp_cpus, payload_size);
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}
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return cpus;
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}
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struct cpu_map *cpu_map__read(FILE *file)
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{
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struct cpu_map *cpus = NULL;
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int nr_cpus = 0;
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int *tmp_cpus = NULL, *tmp;
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int max_entries = 0;
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int n, cpu, prev;
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char sep;
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sep = 0;
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prev = -1;
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for (;;) {
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n = fscanf(file, "%u%c", &cpu, &sep);
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if (n <= 0)
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break;
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if (prev >= 0) {
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int new_max = nr_cpus + cpu - prev - 1;
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if (new_max >= max_entries) {
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max_entries = new_max + MAX_NR_CPUS / 2;
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tmp = realloc(tmp_cpus, max_entries * sizeof(int));
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if (tmp == NULL)
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goto out_free_tmp;
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tmp_cpus = tmp;
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}
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while (++prev < cpu)
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tmp_cpus[nr_cpus++] = prev;
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}
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if (nr_cpus == max_entries) {
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max_entries += MAX_NR_CPUS;
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tmp = realloc(tmp_cpus, max_entries * sizeof(int));
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if (tmp == NULL)
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goto out_free_tmp;
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tmp_cpus = tmp;
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}
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tmp_cpus[nr_cpus++] = cpu;
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if (n == 2 && sep == '-')
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prev = cpu;
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else
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prev = -1;
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if (n == 1 || sep == '\n')
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break;
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}
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if (nr_cpus > 0)
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cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
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else
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cpus = cpu_map__default_new();
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out_free_tmp:
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free(tmp_cpus);
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return cpus;
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}
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static struct cpu_map *cpu_map__read_all_cpu_map(void)
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{
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struct cpu_map *cpus = NULL;
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FILE *onlnf;
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onlnf = fopen("/sys/devices/system/cpu/online", "r");
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if (!onlnf)
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return cpu_map__default_new();
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cpus = cpu_map__read(onlnf);
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fclose(onlnf);
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return cpus;
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}
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struct cpu_map *cpu_map__new(const char *cpu_list)
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{
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struct cpu_map *cpus = NULL;
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unsigned long start_cpu, end_cpu = 0;
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char *p = NULL;
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int i, nr_cpus = 0;
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int *tmp_cpus = NULL, *tmp;
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int max_entries = 0;
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if (!cpu_list)
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return cpu_map__read_all_cpu_map();
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if (!isdigit(*cpu_list))
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goto out;
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while (isdigit(*cpu_list)) {
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p = NULL;
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start_cpu = strtoul(cpu_list, &p, 0);
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if (start_cpu >= INT_MAX
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|| (*p != '\0' && *p != ',' && *p != '-'))
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goto invalid;
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if (*p == '-') {
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cpu_list = ++p;
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p = NULL;
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end_cpu = strtoul(cpu_list, &p, 0);
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if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
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goto invalid;
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if (end_cpu < start_cpu)
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goto invalid;
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} else {
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end_cpu = start_cpu;
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}
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for (; start_cpu <= end_cpu; start_cpu++) {
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/* check for duplicates */
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for (i = 0; i < nr_cpus; i++)
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if (tmp_cpus[i] == (int)start_cpu)
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goto invalid;
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if (nr_cpus == max_entries) {
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max_entries += MAX_NR_CPUS;
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tmp = realloc(tmp_cpus, max_entries * sizeof(int));
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if (tmp == NULL)
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goto invalid;
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tmp_cpus = tmp;
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}
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tmp_cpus[nr_cpus++] = (int)start_cpu;
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}
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if (*p)
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++p;
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cpu_list = p;
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}
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if (nr_cpus > 0)
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cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
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else
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cpus = cpu_map__default_new();
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invalid:
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free(tmp_cpus);
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out:
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return cpus;
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}
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size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
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{
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int i;
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size_t printed = fprintf(fp, "%d cpu%s: ",
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map->nr, map->nr > 1 ? "s" : "");
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for (i = 0; i < map->nr; ++i)
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printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]);
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return printed + fprintf(fp, "\n");
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}
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struct cpu_map *cpu_map__dummy_new(void)
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{
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struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
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if (cpus != NULL) {
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cpus->nr = 1;
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cpus->map[0] = -1;
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}
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return cpus;
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}
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void cpu_map__delete(struct cpu_map *map)
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{
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free(map);
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}
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int cpu_map__get_socket(struct cpu_map *map, int idx)
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{
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FILE *fp;
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const char *mnt;
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char path[PATH_MAX];
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int cpu, ret;
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if (idx > map->nr)
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return -1;
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cpu = map->map[idx];
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mnt = sysfs__mountpoint();
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if (!mnt)
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return -1;
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snprintf(path, PATH_MAX,
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"%s/devices/system/cpu/cpu%d/topology/physical_package_id",
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mnt, cpu);
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fp = fopen(path, "r");
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if (!fp)
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return -1;
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ret = fscanf(fp, "%d", &cpu);
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fclose(fp);
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return ret == 1 ? cpu : -1;
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}
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static int cmp_ids(const void *a, const void *b)
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{
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return *(int *)a - *(int *)b;
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}
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static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
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int (*f)(struct cpu_map *map, int cpu))
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{
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struct cpu_map *c;
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int nr = cpus->nr;
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int cpu, s1, s2;
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/* allocate as much as possible */
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c = calloc(1, sizeof(*c) + nr * sizeof(int));
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if (!c)
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return -1;
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for (cpu = 0; cpu < nr; cpu++) {
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s1 = f(cpus, cpu);
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for (s2 = 0; s2 < c->nr; s2++) {
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if (s1 == c->map[s2])
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break;
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}
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if (s2 == c->nr) {
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c->map[c->nr] = s1;
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c->nr++;
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}
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}
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/* ensure we process id in increasing order */
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qsort(c->map, c->nr, sizeof(int), cmp_ids);
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*res = c;
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return 0;
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}
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int cpu_map__get_core(struct cpu_map *map, int idx)
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{
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FILE *fp;
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const char *mnt;
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char path[PATH_MAX];
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int cpu, ret, s;
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if (idx > map->nr)
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return -1;
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cpu = map->map[idx];
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mnt = sysfs__mountpoint();
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if (!mnt)
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return -1;
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snprintf(path, PATH_MAX,
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"%s/devices/system/cpu/cpu%d/topology/core_id",
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mnt, cpu);
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fp = fopen(path, "r");
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if (!fp)
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return -1;
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ret = fscanf(fp, "%d", &cpu);
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fclose(fp);
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if (ret != 1)
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return -1;
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s = cpu_map__get_socket(map, idx);
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if (s == -1)
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return -1;
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/*
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* encode socket in upper 16 bits
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* core_id is relative to socket, and
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* we need a global id. So we combine
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* socket+ core id
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*/
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return (s << 16) | (cpu & 0xffff);
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}
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int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
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{
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return cpu_map__build_map(cpus, sockp, cpu_map__get_socket);
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}
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int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
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{
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return cpu_map__build_map(cpus, corep, cpu_map__get_core);
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}
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/* setup simple routines to easily access node numbers given a cpu number */
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static int get_max_num(char *path, int *max)
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{
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size_t num;
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char *buf;
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int err = 0;
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if (filename__read_str(path, &buf, &num))
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return -1;
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buf[num] = '\0';
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/* start on the right, to find highest node num */
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while (--num) {
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if ((buf[num] == ',') || (buf[num] == '-')) {
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num++;
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break;
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}
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}
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if (sscanf(&buf[num], "%d", max) < 1) {
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err = -1;
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goto out;
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}
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/* convert from 0-based to 1-based */
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(*max)++;
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out:
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free(buf);
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return err;
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}
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/* Determine highest possible cpu in the system for sparse allocation */
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static void set_max_cpu_num(void)
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{
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const char *mnt;
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char path[PATH_MAX];
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int ret = -1;
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/* set up default */
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max_cpu_num = 4096;
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mnt = sysfs__mountpoint();
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if (!mnt)
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goto out;
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/* get the highest possible cpu number for a sparse allocation */
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ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
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if (ret == PATH_MAX) {
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pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
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goto out;
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}
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ret = get_max_num(path, &max_cpu_num);
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out:
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if (ret)
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pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
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}
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/* Determine highest possible node in the system for sparse allocation */
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static void set_max_node_num(void)
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{
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const char *mnt;
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char path[PATH_MAX];
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int ret = -1;
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/* set up default */
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max_node_num = 8;
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mnt = sysfs__mountpoint();
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if (!mnt)
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goto out;
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/* get the highest possible cpu number for a sparse allocation */
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ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
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if (ret == PATH_MAX) {
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pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
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goto out;
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}
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ret = get_max_num(path, &max_node_num);
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out:
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if (ret)
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pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
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}
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static int init_cpunode_map(void)
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{
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int i;
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set_max_cpu_num();
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set_max_node_num();
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cpunode_map = calloc(max_cpu_num, sizeof(int));
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if (!cpunode_map) {
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pr_err("%s: calloc failed\n", __func__);
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return -1;
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}
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for (i = 0; i < max_cpu_num; i++)
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cpunode_map[i] = -1;
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return 0;
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}
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int cpu__setup_cpunode_map(void)
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{
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struct dirent *dent1, *dent2;
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DIR *dir1, *dir2;
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unsigned int cpu, mem;
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char buf[PATH_MAX];
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char path[PATH_MAX];
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const char *mnt;
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int n;
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/* initialize globals */
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if (init_cpunode_map())
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return -1;
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mnt = sysfs__mountpoint();
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if (!mnt)
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return 0;
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n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
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if (n == PATH_MAX) {
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pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
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return -1;
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}
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dir1 = opendir(path);
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if (!dir1)
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return 0;
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/* walk tree and setup map */
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while ((dent1 = readdir(dir1)) != NULL) {
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if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
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continue;
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n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
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if (n == PATH_MAX) {
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pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
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continue;
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}
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dir2 = opendir(buf);
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if (!dir2)
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continue;
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while ((dent2 = readdir(dir2)) != NULL) {
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if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
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continue;
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cpunode_map[cpu] = mem;
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}
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closedir(dir2);
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}
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closedir(dir1);
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return 0;
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}
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