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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
With the movement of lots of stuff out of perf.h to other headers we ended up not needing it in lots of places, remove it from those places. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-c718m0sxxwp73lp9d8vpihb4@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
570 lines
11 KiB
C
570 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <api/fs/fs.h>
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#include "cpumap.h"
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#include "debug.h"
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#include "event.h"
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#include <assert.h>
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#include <dirent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <linux/bitmap.h>
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#include "asm/bug.h"
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#include <linux/ctype.h>
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#include <linux/zalloc.h>
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static int max_cpu_num;
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static int max_present_cpu_num;
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static int max_node_num;
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static int *cpunode_map;
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static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
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{
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struct perf_cpu_map *map;
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map = perf_cpu_map__empty_new(cpus->nr);
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if (map) {
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unsigned i;
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for (i = 0; i < cpus->nr; i++) {
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/*
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* Special treatment for -1, which is not real cpu number,
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* and we need to use (int) -1 to initialize map[i],
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* otherwise it would become 65535.
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*/
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if (cpus->cpu[i] == (u16) -1)
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map->map[i] = -1;
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else
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map->map[i] = (int) cpus->cpu[i];
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}
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}
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return map;
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}
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static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask)
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{
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struct perf_cpu_map *map;
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int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
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nr = bitmap_weight(mask->mask, nbits);
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map = perf_cpu_map__empty_new(nr);
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if (map) {
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int cpu, i = 0;
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for_each_set_bit(cpu, mask->mask, nbits)
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map->map[i++] = cpu;
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}
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return map;
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}
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struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data)
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{
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if (data->type == PERF_CPU_MAP__CPUS)
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return cpu_map__from_entries((struct cpu_map_entries *)data->data);
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else
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return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data);
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}
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size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
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{
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#define BUFSIZE 1024
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char buf[BUFSIZE];
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cpu_map__snprint(map, buf, sizeof(buf));
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return fprintf(fp, "%s\n", buf);
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#undef BUFSIZE
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}
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struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
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{
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struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
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if (cpus != NULL) {
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int i;
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cpus->nr = nr;
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for (i = 0; i < nr; i++)
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cpus->map[i] = -1;
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refcount_set(&cpus->refcnt, 1);
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}
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return cpus;
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}
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static int cpu__get_topology_int(int cpu, const char *name, int *value)
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{
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char path[PATH_MAX];
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snprintf(path, PATH_MAX,
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"devices/system/cpu/cpu%d/topology/%s", cpu, name);
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return sysfs__read_int(path, value);
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}
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int cpu_map__get_socket_id(int cpu)
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{
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int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
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return ret ?: value;
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}
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int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
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{
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int cpu;
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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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return cpu_map__get_socket_id(cpu);
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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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int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res,
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int (*f)(struct perf_cpu_map *map, int cpu, void *data),
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void *data)
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{
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struct perf_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, data);
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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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refcount_set(&c->refcnt, 1);
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*res = c;
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return 0;
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}
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int cpu_map__get_die_id(int cpu)
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{
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int value, ret = cpu__get_topology_int(cpu, "die_id", &value);
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return ret ?: value;
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}
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int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data)
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{
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int cpu, die_id, 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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die_id = cpu_map__get_die_id(cpu);
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/* There is no die_id on legacy system. */
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if (die_id == -1)
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die_id = 0;
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s = cpu_map__get_socket(map, idx, data);
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if (s == -1)
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return -1;
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/*
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* Encode socket in bit range 15:8
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* die_id is relative to socket, and
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* we need a global id. So we combine
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* socket + die id
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*/
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if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n"))
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return -1;
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if (WARN_ONCE(s >> 8, "The socket id number is too big.\n"))
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return -1;
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return (s << 8) | (die_id & 0xff);
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}
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int cpu_map__get_core_id(int cpu)
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{
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int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
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return ret ?: value;
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}
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int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
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{
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int cpu, s_die;
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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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cpu = cpu_map__get_core_id(cpu);
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/* s_die is the combination of socket + die id */
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s_die = cpu_map__get_die(map, idx, data);
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if (s_die == -1)
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return -1;
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/*
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* encode socket in bit range 31:24
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* encode die id in bit range 23:16
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* core_id is relative to socket and die,
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* we need a global id. So we combine
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* socket + die id + core id
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*/
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if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
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return -1;
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return (s_die << 16) | (cpu & 0xffff);
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}
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int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
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{
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return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
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}
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int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
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{
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return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
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}
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int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
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{
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return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
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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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max_present_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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if (ret)
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goto out;
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/* get the highest present cpu number for a sparse allocation */
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ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", 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_present_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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int cpu__max_node(void)
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{
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if (unlikely(!max_node_num))
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set_max_node_num();
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return max_node_num;
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}
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int cpu__max_cpu(void)
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{
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if (unlikely(!max_cpu_num))
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set_max_cpu_num();
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return max_cpu_num;
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}
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int cpu__max_present_cpu(void)
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{
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if (unlikely(!max_present_cpu_num))
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set_max_cpu_num();
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return max_present_cpu_num;
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}
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int cpu__get_node(int cpu)
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{
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if (unlikely(cpunode_map == NULL)) {
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pr_debug("cpu_map not initialized\n");
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return -1;
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}
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return cpunode_map[cpu];
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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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bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
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{
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return perf_cpu_map__idx(cpus, cpu) != -1;
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}
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int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
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{
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return cpus->map[idx];
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}
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size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
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{
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int i, cpu, start = -1;
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bool first = true;
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size_t ret = 0;
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#define COMMA first ? "" : ","
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for (i = 0; i < map->nr + 1; i++) {
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bool last = i == map->nr;
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cpu = last ? INT_MAX : map->map[i];
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if (start == -1) {
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start = i;
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if (last) {
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ret += snprintf(buf + ret, size - ret,
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"%s%d", COMMA,
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map->map[i]);
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}
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} else if (((i - start) != (cpu - map->map[start])) || last) {
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int end = i - 1;
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if (start == end) {
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ret += snprintf(buf + ret, size - ret,
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"%s%d", COMMA,
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map->map[start]);
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} else {
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ret += snprintf(buf + ret, size - ret,
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"%s%d-%d", COMMA,
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map->map[start], map->map[end]);
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}
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first = false;
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start = i;
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}
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}
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#undef COMMA
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pr_debug2("cpumask list: %s\n", buf);
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return ret;
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}
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static char hex_char(unsigned char val)
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{
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if (val < 10)
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return val + '0';
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if (val < 16)
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return val - 10 + 'a';
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return '?';
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}
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size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
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{
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int i, cpu;
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char *ptr = buf;
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unsigned char *bitmap;
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int last_cpu = cpu_map__cpu(map, map->nr - 1);
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if (buf == NULL)
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return 0;
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bitmap = zalloc(last_cpu / 8 + 1);
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if (bitmap == NULL) {
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buf[0] = '\0';
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return 0;
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}
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for (i = 0; i < map->nr; i++) {
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cpu = cpu_map__cpu(map, i);
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bitmap[cpu / 8] |= 1 << (cpu % 8);
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}
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for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
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unsigned char bits = bitmap[cpu / 8];
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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;
|
|
}
|