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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/util/cpumap.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/cpumap.c')
-rw-r--r-- | tools/perf/util/cpumap.c | 588 |
1 files changed, 588 insertions, 0 deletions
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c new file mode 100644 index 000000000..dc5c5e6fc --- /dev/null +++ b/tools/perf/util/cpumap.c @@ -0,0 +1,588 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <api/fs/fs.h> +#include "cpumap.h" +#include "debug.h" +#include "event.h" +#include <assert.h> +#include <dirent.h> +#include <stdio.h> +#include <stdlib.h> +#include <linux/bitmap.h> +#include "asm/bug.h" + +#include <linux/ctype.h> +#include <linux/zalloc.h> + +static int max_cpu_num; +static int max_present_cpu_num; +static int max_node_num; +static int *cpunode_map; + +static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus) +{ + struct perf_cpu_map *map; + + map = perf_cpu_map__empty_new(cpus->nr); + if (map) { + unsigned i; + + for (i = 0; i < cpus->nr; i++) { + /* + * Special treatment for -1, which is not real cpu number, + * and we need to use (int) -1 to initialize map[i], + * otherwise it would become 65535. + */ + if (cpus->cpu[i] == (u16) -1) + map->map[i] = -1; + else + map->map[i] = (int) cpus->cpu[i]; + } + } + + return map; +} + +static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask) +{ + struct perf_cpu_map *map; + int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE; + + nr = bitmap_weight(mask->mask, nbits); + + map = perf_cpu_map__empty_new(nr); + if (map) { + int cpu, i = 0; + + for_each_set_bit(cpu, mask->mask, nbits) + map->map[i++] = cpu; + } + return map; + +} + +struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data) +{ + if (data->type == PERF_CPU_MAP__CPUS) + return cpu_map__from_entries((struct cpu_map_entries *)data->data); + else + return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data); +} + +size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp) +{ +#define BUFSIZE 1024 + char buf[BUFSIZE]; + + cpu_map__snprint(map, buf, sizeof(buf)); + return fprintf(fp, "%s\n", buf); +#undef BUFSIZE +} + +struct perf_cpu_map *perf_cpu_map__empty_new(int nr) +{ + struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr); + + if (cpus != NULL) { + int i; + + cpus->nr = nr; + for (i = 0; i < nr; i++) + cpus->map[i] = -1; + + refcount_set(&cpus->refcnt, 1); + } + + return cpus; +} + +static int cpu__get_topology_int(int cpu, const char *name, int *value) +{ + char path[PATH_MAX]; + + snprintf(path, PATH_MAX, + "devices/system/cpu/cpu%d/topology/%s", cpu, name); + + return sysfs__read_int(path, value); +} + +int cpu_map__get_socket_id(int cpu) +{ + int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value); + return ret ?: value; +} + +int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused) +{ + int cpu; + + if (idx > map->nr) + return -1; + + cpu = map->map[idx]; + + return cpu_map__get_socket_id(cpu); +} + +static int cmp_ids(const void *a, const void *b) +{ + return *(int *)a - *(int *)b; +} + +int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res, + int (*f)(struct perf_cpu_map *map, int cpu, void *data), + void *data) +{ + struct perf_cpu_map *c; + int nr = cpus->nr; + int cpu, s1, s2; + + /* allocate as much as possible */ + c = calloc(1, sizeof(*c) + nr * sizeof(int)); + if (!c) + return -1; + + for (cpu = 0; cpu < nr; cpu++) { + s1 = f(cpus, cpu, data); + for (s2 = 0; s2 < c->nr; s2++) { + if (s1 == c->map[s2]) + break; + } + if (s2 == c->nr) { + c->map[c->nr] = s1; + c->nr++; + } + } + /* ensure we process id in increasing order */ + qsort(c->map, c->nr, sizeof(int), cmp_ids); + + refcount_set(&c->refcnt, 1); + *res = c; + return 0; +} + +int cpu_map__get_die_id(int cpu) +{ + int value, ret = cpu__get_topology_int(cpu, "die_id", &value); + + return ret ?: value; +} + +int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data) +{ + int cpu, die_id, s; + + if (idx > map->nr) + return -1; + + cpu = map->map[idx]; + + die_id = cpu_map__get_die_id(cpu); + /* There is no die_id on legacy system. */ + if (die_id == -1) + die_id = 0; + + s = cpu_map__get_socket(map, idx, data); + if (s == -1) + return -1; + + /* + * Encode socket in bit range 15:8 + * die_id is relative to socket, and + * we need a global id. So we combine + * socket + die id + */ + if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n")) + return -1; + + if (WARN_ONCE(s >> 8, "The socket id number is too big.\n")) + return -1; + + return (s << 8) | (die_id & 0xff); +} + +int cpu_map__get_core_id(int cpu) +{ + int value, ret = cpu__get_topology_int(cpu, "core_id", &value); + return ret ?: value; +} + +int cpu_map__get_node_id(int cpu) +{ + return cpu__get_node(cpu); +} + +int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data) +{ + int cpu, s_die; + + if (idx > map->nr) + return -1; + + cpu = map->map[idx]; + + cpu = cpu_map__get_core_id(cpu); + + /* s_die is the combination of socket + die id */ + s_die = cpu_map__get_die(map, idx, data); + if (s_die == -1) + return -1; + + /* + * encode socket in bit range 31:24 + * encode die id in bit range 23:16 + * core_id is relative to socket and die, + * we need a global id. So we combine + * socket + die id + core id + */ + if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n")) + return -1; + + return (s_die << 16) | (cpu & 0xffff); +} + +int cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused) +{ + if (idx < 0 || idx >= map->nr) + return -1; + + return cpu_map__get_node_id(map->map[idx]); +} + +int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp) +{ + return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL); +} + +int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep) +{ + return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL); +} + +int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep) +{ + return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL); +} + +int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **numap) +{ + return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL); +} + +/* setup simple routines to easily access node numbers given a cpu number */ +static int get_max_num(char *path, int *max) +{ + size_t num; + char *buf; + int err = 0; + + if (filename__read_str(path, &buf, &num)) + return -1; + + buf[num] = '\0'; + + /* start on the right, to find highest node num */ + while (--num) { + if ((buf[num] == ',') || (buf[num] == '-')) { + num++; + break; + } + } + if (sscanf(&buf[num], "%d", max) < 1) { + err = -1; + goto out; + } + + /* convert from 0-based to 1-based */ + (*max)++; + +out: + free(buf); + return err; +} + +/* Determine highest possible cpu in the system for sparse allocation */ +static void set_max_cpu_num(void) +{ + const char *mnt; + char path[PATH_MAX]; + int ret = -1; + + /* set up default */ + max_cpu_num = 4096; + max_present_cpu_num = 4096; + + mnt = sysfs__mountpoint(); + if (!mnt) + goto out; + + /* get the highest possible cpu number for a sparse allocation */ + ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt); + if (ret >= PATH_MAX) { + pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); + goto out; + } + + ret = get_max_num(path, &max_cpu_num); + if (ret) + goto out; + + /* get the highest present cpu number for a sparse allocation */ + ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt); + if (ret >= PATH_MAX) { + pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); + goto out; + } + + ret = get_max_num(path, &max_present_cpu_num); + +out: + if (ret) + pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num); +} + +/* Determine highest possible node in the system for sparse allocation */ +static void set_max_node_num(void) +{ + const char *mnt; + char path[PATH_MAX]; + int ret = -1; + + /* set up default */ + max_node_num = 8; + + mnt = sysfs__mountpoint(); + if (!mnt) + goto out; + + /* get the highest possible cpu number for a sparse allocation */ + ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt); + if (ret >= PATH_MAX) { + pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); + goto out; + } + + ret = get_max_num(path, &max_node_num); + +out: + if (ret) + pr_err("Failed to read max nodes, using default of %d\n", max_node_num); +} + +int cpu__max_node(void) +{ + if (unlikely(!max_node_num)) + set_max_node_num(); + + return max_node_num; +} + +int cpu__max_cpu(void) +{ + if (unlikely(!max_cpu_num)) + set_max_cpu_num(); + + return max_cpu_num; +} + +int cpu__max_present_cpu(void) +{ + if (unlikely(!max_present_cpu_num)) + set_max_cpu_num(); + + return max_present_cpu_num; +} + + +int cpu__get_node(int cpu) +{ + if (unlikely(cpunode_map == NULL)) { + pr_debug("cpu_map not initialized\n"); + return -1; + } + + return cpunode_map[cpu]; +} + +static int init_cpunode_map(void) +{ + int i; + + set_max_cpu_num(); + set_max_node_num(); + + cpunode_map = calloc(max_cpu_num, sizeof(int)); + if (!cpunode_map) { + pr_err("%s: calloc failed\n", __func__); + return -1; + } + + for (i = 0; i < max_cpu_num; i++) + cpunode_map[i] = -1; + + return 0; +} + +int cpu__setup_cpunode_map(void) +{ + struct dirent *dent1, *dent2; + DIR *dir1, *dir2; + unsigned int cpu, mem; + char buf[PATH_MAX]; + char path[PATH_MAX]; + const char *mnt; + int n; + + /* initialize globals */ + if (init_cpunode_map()) + return -1; + + mnt = sysfs__mountpoint(); + if (!mnt) + return 0; + + n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt); + if (n >= PATH_MAX) { + pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); + return -1; + } + + dir1 = opendir(path); + if (!dir1) + return 0; + + /* walk tree and setup map */ + while ((dent1 = readdir(dir1)) != NULL) { + if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1) + continue; + + n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name); + if (n >= PATH_MAX) { + pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); + continue; + } + + dir2 = opendir(buf); + if (!dir2) + continue; + while ((dent2 = readdir(dir2)) != NULL) { + if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1) + continue; + cpunode_map[cpu] = mem; + } + closedir(dir2); + } + closedir(dir1); + return 0; +} + +bool cpu_map__has(struct perf_cpu_map *cpus, int cpu) +{ + return perf_cpu_map__idx(cpus, cpu) != -1; +} + +int cpu_map__cpu(struct perf_cpu_map *cpus, int idx) +{ + return cpus->map[idx]; +} + +size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size) +{ + int i, cpu, start = -1; + bool first = true; + size_t ret = 0; + +#define COMMA first ? "" : "," + + for (i = 0; i < map->nr + 1; i++) { + bool last = i == map->nr; + + cpu = last ? INT_MAX : map->map[i]; + + if (start == -1) { + start = i; + if (last) { + ret += snprintf(buf + ret, size - ret, + "%s%d", COMMA, + map->map[i]); + } + } else if (((i - start) != (cpu - map->map[start])) || last) { + int end = i - 1; + + if (start == end) { + ret += snprintf(buf + ret, size - ret, + "%s%d", COMMA, + map->map[start]); + } else { + ret += snprintf(buf + ret, size - ret, + "%s%d-%d", COMMA, + map->map[start], map->map[end]); + } + first = false; + start = i; + } + } + +#undef COMMA + + pr_debug2("cpumask list: %s\n", buf); + return ret; +} + +static char hex_char(unsigned char val) +{ + if (val < 10) + return val + '0'; + if (val < 16) + return val - 10 + 'a'; + return '?'; +} + +size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size) +{ + int i, cpu; + char *ptr = buf; + unsigned char *bitmap; + int last_cpu = cpu_map__cpu(map, map->nr - 1); + + if (buf == NULL) + return 0; + + bitmap = zalloc(last_cpu / 8 + 1); + if (bitmap == NULL) { + buf[0] = '\0'; + return 0; + } + + for (i = 0; i < map->nr; i++) { + cpu = cpu_map__cpu(map, i); + bitmap[cpu / 8] |= 1 << (cpu % 8); + } + + for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) { + unsigned char bits = bitmap[cpu / 8]; + + if (cpu % 8) + bits >>= 4; + else + bits &= 0xf; + + *ptr++ = hex_char(bits); + if ((cpu % 32) == 0 && cpu > 0) + *ptr++ = ','; + } + *ptr = '\0'; + free(bitmap); + + buf[size - 1] = '\0'; + return ptr - buf; +} + +const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ +{ + static const struct perf_cpu_map *online = NULL; + + if (!online) + online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */ + + return online; +} |