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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /tools/perf/util/cpumap.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
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 | 717 |
1 files changed, 717 insertions, 0 deletions
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c new file mode 100644 index 0000000000..0e090e8bc3 --- /dev/null +++ b/tools/perf/util/cpumap.c @@ -0,0 +1,717 @@ +// 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> +#include <internal/cpumap.h> + +static struct perf_cpu max_cpu_num; +static struct perf_cpu max_present_cpu_num; +static int max_node_num; +/** + * The numa node X as read from /sys/devices/system/node/nodeX indexed by the + * CPU number. + */ +static int *cpunode_map; + +bool perf_record_cpu_map_data__test_bit(int i, + const struct perf_record_cpu_map_data *data) +{ + int bit_word32 = i / 32; + __u32 bit_mask32 = 1U << (i & 31); + int bit_word64 = i / 64; + __u64 bit_mask64 = ((__u64)1) << (i & 63); + + return (data->mask32_data.long_size == 4) + ? (bit_word32 < data->mask32_data.nr) && + (data->mask32_data.mask[bit_word32] & bit_mask32) != 0 + : (bit_word64 < data->mask64_data.nr) && + (data->mask64_data.mask[bit_word64] & bit_mask64) != 0; +} + +/* Read ith mask value from data into the given 64-bit sized bitmap */ +static void perf_record_cpu_map_data__read_one_mask(const struct perf_record_cpu_map_data *data, + int i, unsigned long *bitmap) +{ +#if __SIZEOF_LONG__ == 8 + if (data->mask32_data.long_size == 4) + bitmap[0] = data->mask32_data.mask[i]; + else + bitmap[0] = data->mask64_data.mask[i]; +#else + if (data->mask32_data.long_size == 4) { + bitmap[0] = data->mask32_data.mask[i]; + bitmap[1] = 0; + } else { +#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ + bitmap[0] = (unsigned long)(data->mask64_data.mask[i] >> 32); + bitmap[1] = (unsigned long)data->mask64_data.mask[i]; +#else + bitmap[0] = (unsigned long)data->mask64_data.mask[i]; + bitmap[1] = (unsigned long)(data->mask64_data.mask[i] >> 32); +#endif + } +#endif +} +static struct perf_cpu_map *cpu_map__from_entries(const struct perf_record_cpu_map_data *data) +{ + struct perf_cpu_map *map; + + map = perf_cpu_map__empty_new(data->cpus_data.nr); + if (map) { + unsigned i; + + for (i = 0; i < data->cpus_data.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 (data->cpus_data.cpu[i] == (u16) -1) + RC_CHK_ACCESS(map)->map[i].cpu = -1; + else + RC_CHK_ACCESS(map)->map[i].cpu = (int) data->cpus_data.cpu[i]; + } + } + + return map; +} + +static struct perf_cpu_map *cpu_map__from_mask(const struct perf_record_cpu_map_data *data) +{ + DECLARE_BITMAP(local_copy, 64); + int weight = 0, mask_nr = data->mask32_data.nr; + struct perf_cpu_map *map; + + for (int i = 0; i < mask_nr; i++) { + perf_record_cpu_map_data__read_one_mask(data, i, local_copy); + weight += bitmap_weight(local_copy, 64); + } + + map = perf_cpu_map__empty_new(weight); + if (!map) + return NULL; + + for (int i = 0, j = 0; i < mask_nr; i++) { + int cpus_per_i = (i * data->mask32_data.long_size * BITS_PER_BYTE); + int cpu; + + perf_record_cpu_map_data__read_one_mask(data, i, local_copy); + for_each_set_bit(cpu, local_copy, 64) + RC_CHK_ACCESS(map)->map[j++].cpu = cpu + cpus_per_i; + } + return map; + +} + +static struct perf_cpu_map *cpu_map__from_range(const struct perf_record_cpu_map_data *data) +{ + struct perf_cpu_map *map; + unsigned int i = 0; + + map = perf_cpu_map__empty_new(data->range_cpu_data.end_cpu - + data->range_cpu_data.start_cpu + 1 + data->range_cpu_data.any_cpu); + if (!map) + return NULL; + + if (data->range_cpu_data.any_cpu) + RC_CHK_ACCESS(map)->map[i++].cpu = -1; + + for (int cpu = data->range_cpu_data.start_cpu; cpu <= data->range_cpu_data.end_cpu; + i++, cpu++) + RC_CHK_ACCESS(map)->map[i].cpu = cpu; + + return map; +} + +struct perf_cpu_map *cpu_map__new_data(const struct perf_record_cpu_map_data *data) +{ + switch (data->type) { + case PERF_CPU_MAP__CPUS: + return cpu_map__from_entries(data); + case PERF_CPU_MAP__MASK: + return cpu_map__from_mask(data); + case PERF_CPU_MAP__RANGE_CPUS: + return cpu_map__from_range(data); + default: + pr_err("cpu_map__new_data unknown type %d\n", data->type); + return NULL; + } +} + +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 = perf_cpu_map__alloc(nr); + + if (cpus != NULL) { + for (int i = 0; i < nr; i++) + RC_CHK_ACCESS(cpus)->map[i].cpu = -1; + } + + return cpus; +} + +struct cpu_aggr_map *cpu_aggr_map__empty_new(int nr) +{ + struct cpu_aggr_map *cpus = malloc(sizeof(*cpus) + sizeof(struct aggr_cpu_id) * nr); + + if (cpus != NULL) { + int i; + + cpus->nr = nr; + for (i = 0; i < nr; i++) + cpus->map[i] = aggr_cpu_id__empty(); + + 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__get_socket_id(struct perf_cpu cpu) +{ + int value, ret = cpu__get_topology_int(cpu.cpu, "physical_package_id", &value); + return ret ?: value; +} + +struct aggr_cpu_id aggr_cpu_id__socket(struct perf_cpu cpu, void *data __maybe_unused) +{ + struct aggr_cpu_id id = aggr_cpu_id__empty(); + + id.socket = cpu__get_socket_id(cpu); + return id; +} + +static int aggr_cpu_id__cmp(const void *a_pointer, const void *b_pointer) +{ + struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer; + struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer; + + if (a->node != b->node) + return a->node - b->node; + else if (a->socket != b->socket) + return a->socket - b->socket; + else if (a->die != b->die) + return a->die - b->die; + else if (a->cache_lvl != b->cache_lvl) + return a->cache_lvl - b->cache_lvl; + else if (a->cache != b->cache) + return a->cache - b->cache; + else if (a->core != b->core) + return a->core - b->core; + else + return a->thread_idx - b->thread_idx; +} + +struct cpu_aggr_map *cpu_aggr_map__new(const struct perf_cpu_map *cpus, + aggr_cpu_id_get_t get_id, + void *data, bool needs_sort) +{ + int idx; + struct perf_cpu cpu; + struct cpu_aggr_map *c = cpu_aggr_map__empty_new(perf_cpu_map__nr(cpus)); + + if (!c) + return NULL; + + /* Reset size as it may only be partially filled */ + c->nr = 0; + + perf_cpu_map__for_each_cpu(cpu, idx, cpus) { + bool duplicate = false; + struct aggr_cpu_id cpu_id = get_id(cpu, data); + + for (int j = 0; j < c->nr; j++) { + if (aggr_cpu_id__equal(&cpu_id, &c->map[j])) { + duplicate = true; + break; + } + } + if (!duplicate) { + c->map[c->nr] = cpu_id; + c->nr++; + } + } + /* Trim. */ + if (c->nr != perf_cpu_map__nr(cpus)) { + struct cpu_aggr_map *trimmed_c = + realloc(c, + sizeof(struct cpu_aggr_map) + sizeof(struct aggr_cpu_id) * c->nr); + + if (trimmed_c) + c = trimmed_c; + } + + /* ensure we process id in increasing order */ + if (needs_sort) + qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), aggr_cpu_id__cmp); + + return c; + +} + +int cpu__get_die_id(struct perf_cpu cpu) +{ + int value, ret = cpu__get_topology_int(cpu.cpu, "die_id", &value); + + return ret ?: value; +} + +struct aggr_cpu_id aggr_cpu_id__die(struct perf_cpu cpu, void *data) +{ + struct aggr_cpu_id id; + int die; + + die = cpu__get_die_id(cpu); + /* There is no die_id on legacy system. */ + if (die == -1) + die = 0; + + /* + * die_id is relative to socket, so start + * with the socket ID and then add die to + * make a unique ID. + */ + id = aggr_cpu_id__socket(cpu, data); + if (aggr_cpu_id__is_empty(&id)) + return id; + + id.die = die; + return id; +} + +int cpu__get_core_id(struct perf_cpu cpu) +{ + int value, ret = cpu__get_topology_int(cpu.cpu, "core_id", &value); + return ret ?: value; +} + +struct aggr_cpu_id aggr_cpu_id__core(struct perf_cpu cpu, void *data) +{ + struct aggr_cpu_id id; + int core = cpu__get_core_id(cpu); + + /* aggr_cpu_id__die returns a struct with socket and die set. */ + id = aggr_cpu_id__die(cpu, data); + if (aggr_cpu_id__is_empty(&id)) + return id; + + /* + * core_id is relative to socket and die, we need a global id. + * So we combine the result from cpu_map__get_die with the core id + */ + id.core = core; + return id; + +} + +struct aggr_cpu_id aggr_cpu_id__cpu(struct perf_cpu cpu, void *data) +{ + struct aggr_cpu_id id; + + /* aggr_cpu_id__core returns a struct with socket, die and core set. */ + id = aggr_cpu_id__core(cpu, data); + if (aggr_cpu_id__is_empty(&id)) + return id; + + id.cpu = cpu; + return id; + +} + +struct aggr_cpu_id aggr_cpu_id__node(struct perf_cpu cpu, void *data __maybe_unused) +{ + struct aggr_cpu_id id = aggr_cpu_id__empty(); + + id.node = cpu__get_node(cpu); + return id; +} + +struct aggr_cpu_id aggr_cpu_id__global(struct perf_cpu cpu, void *data __maybe_unused) +{ + struct aggr_cpu_id id = aggr_cpu_id__empty(); + + /* it always aggregates to the cpu 0 */ + cpu.cpu = 0; + id.cpu = cpu; + return id; +} + +/* 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.cpu = 4096; + max_present_cpu_num.cpu = 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.cpu); + 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.cpu); + +out: + if (ret) + pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num.cpu); +} + +/* 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; +} + +struct perf_cpu cpu__max_cpu(void) +{ + if (unlikely(!max_cpu_num.cpu)) + set_max_cpu_num(); + + return max_cpu_num; +} + +struct perf_cpu cpu__max_present_cpu(void) +{ + if (unlikely(!max_present_cpu_num.cpu)) + set_max_cpu_num(); + + return max_present_cpu_num; +} + + +int cpu__get_node(struct perf_cpu cpu) +{ + if (unlikely(cpunode_map == NULL)) { + pr_debug("cpu_map not initialized\n"); + return -1; + } + + return cpunode_map[cpu.cpu]; +} + +static int init_cpunode_map(void) +{ + int i; + + set_max_cpu_num(); + set_max_node_num(); + + cpunode_map = calloc(max_cpu_num.cpu, sizeof(int)); + if (!cpunode_map) { + pr_err("%s: calloc failed\n", __func__); + return -1; + } + + for (i = 0; i < max_cpu_num.cpu; 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; +} + +size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size) +{ + int i, start = -1; + bool first = true; + size_t ret = 0; + +#define COMMA first ? "" : "," + + for (i = 0; i < perf_cpu_map__nr(map) + 1; i++) { + struct perf_cpu cpu = { .cpu = INT_MAX }; + bool last = i == perf_cpu_map__nr(map); + + if (!last) + cpu = perf_cpu_map__cpu(map, i); + + if (start == -1) { + start = i; + if (last) { + ret += snprintf(buf + ret, size - ret, + "%s%d", COMMA, + perf_cpu_map__cpu(map, i).cpu); + } + } else if (((i - start) != (cpu.cpu - perf_cpu_map__cpu(map, start).cpu)) || last) { + int end = i - 1; + + if (start == end) { + ret += snprintf(buf + ret, size - ret, + "%s%d", COMMA, + perf_cpu_map__cpu(map, start).cpu); + } else { + ret += snprintf(buf + ret, size - ret, + "%s%d-%d", COMMA, + perf_cpu_map__cpu(map, start).cpu, perf_cpu_map__cpu(map, end).cpu); + } + 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; + struct perf_cpu last_cpu = perf_cpu_map__cpu(map, perf_cpu_map__nr(map) - 1); + + if (buf == NULL) + return 0; + + bitmap = zalloc(last_cpu.cpu / 8 + 1); + if (bitmap == NULL) { + buf[0] = '\0'; + return 0; + } + + for (i = 0; i < perf_cpu_map__nr(map); i++) { + cpu = perf_cpu_map__cpu(map, i).cpu; + bitmap[cpu / 8] |= 1 << (cpu % 8); + } + + for (cpu = last_cpu.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; +} + +struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ +{ + static struct perf_cpu_map *online; + + if (!online) + online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */ + + return online; +} + +bool aggr_cpu_id__equal(const struct aggr_cpu_id *a, const struct aggr_cpu_id *b) +{ + return a->thread_idx == b->thread_idx && + a->node == b->node && + a->socket == b->socket && + a->die == b->die && + a->cache_lvl == b->cache_lvl && + a->cache == b->cache && + a->core == b->core && + a->cpu.cpu == b->cpu.cpu; +} + +bool aggr_cpu_id__is_empty(const struct aggr_cpu_id *a) +{ + return a->thread_idx == -1 && + a->node == -1 && + a->socket == -1 && + a->die == -1 && + a->cache_lvl == -1 && + a->cache == -1 && + a->core == -1 && + a->cpu.cpu == -1; +} + +struct aggr_cpu_id aggr_cpu_id__empty(void) +{ + struct aggr_cpu_id ret = { + .thread_idx = -1, + .node = -1, + .socket = -1, + .die = -1, + .cache_lvl = -1, + .cache = -1, + .core = -1, + .cpu = (struct perf_cpu){ .cpu = -1 }, + }; + return ret; +} |