370 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2011-2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>4 *5 * Parts came from evlist.c builtin-{top,stat,record}.c, see those files for further6 * copyright notes.7 */8 9#include <sys/mman.h>10#include <inttypes.h>11#include <asm/bug.h>12#include <linux/zalloc.h>13#include <stdlib.h>14#include <string.h>15#include <unistd.h> // sysconf()16#include <perf/mmap.h>17#ifdef HAVE_LIBNUMA_SUPPORT18#include <numaif.h>19#endif20#include "cpumap.h"21#include "debug.h"22#include "event.h"23#include "mmap.h"24#include "../perf.h"25#include <internal/lib.h> /* page_size */26#include <linux/bitmap.h>27 28#define MASK_SIZE 102329void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag)30{31 char buf[MASK_SIZE + 1];32 size_t len;33 34 len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE);35 buf[len] = '\0';36 pr_debug("%p: %s mask[%zd]: %s\n", mask, tag, mask->nbits, buf);37}38 39size_t mmap__mmap_len(struct mmap *map)40{41 return perf_mmap__mmap_len(&map->core);42}43 44int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused,45 struct auxtrace_mmap_params *mp __maybe_unused,46 void *userpg __maybe_unused,47 int fd __maybe_unused)48{49 return 0;50}51 52void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused)53{54}55 56void __weak auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp __maybe_unused,57 off_t auxtrace_offset __maybe_unused,58 unsigned int auxtrace_pages __maybe_unused,59 bool auxtrace_overwrite __maybe_unused)60{61}62 63void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __maybe_unused,64 struct evlist *evlist __maybe_unused,65 struct evsel *evsel __maybe_unused,66 int idx __maybe_unused)67{68}69 70#ifdef HAVE_AIO_SUPPORT71static int perf_mmap__aio_enabled(struct mmap *map)72{73 return map->aio.nr_cblocks > 0;74}75 76#ifdef HAVE_LIBNUMA_SUPPORT77static int perf_mmap__aio_alloc(struct mmap *map, int idx)78{79 map->aio.data[idx] = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE,80 MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);81 if (map->aio.data[idx] == MAP_FAILED) {82 map->aio.data[idx] = NULL;83 return -1;84 }85 86 return 0;87}88 89static void perf_mmap__aio_free(struct mmap *map, int idx)90{91 if (map->aio.data[idx]) {92 munmap(map->aio.data[idx], mmap__mmap_len(map));93 map->aio.data[idx] = NULL;94 }95}96 97static int perf_mmap__aio_bind(struct mmap *map, int idx, struct perf_cpu cpu, int affinity)98{99 void *data;100 size_t mmap_len;101 unsigned long *node_mask;102 unsigned long node_index;103 int err = 0;104 105 if (affinity != PERF_AFFINITY_SYS && cpu__max_node() > 1) {106 data = map->aio.data[idx];107 mmap_len = mmap__mmap_len(map);108 node_index = cpu__get_node(cpu);109 node_mask = bitmap_zalloc(node_index + 1);110 if (!node_mask) {111 pr_err("Failed to allocate node mask for mbind: error %m\n");112 return -1;113 }114 __set_bit(node_index, node_mask);115 if (mbind(data, mmap_len, MPOL_BIND, node_mask, node_index + 1 + 1, 0)) {116 pr_err("Failed to bind [%p-%p] AIO buffer to node %lu: error %m\n",117 data, data + mmap_len, node_index);118 err = -1;119 }120 bitmap_free(node_mask);121 }122 123 return err;124}125#else /* !HAVE_LIBNUMA_SUPPORT */126static int perf_mmap__aio_alloc(struct mmap *map, int idx)127{128 map->aio.data[idx] = malloc(mmap__mmap_len(map));129 if (map->aio.data[idx] == NULL)130 return -1;131 132 return 0;133}134 135static void perf_mmap__aio_free(struct mmap *map, int idx)136{137 zfree(&(map->aio.data[idx]));138}139 140static int perf_mmap__aio_bind(struct mmap *map __maybe_unused, int idx __maybe_unused,141 struct perf_cpu cpu __maybe_unused, int affinity __maybe_unused)142{143 return 0;144}145#endif146 147static int perf_mmap__aio_mmap(struct mmap *map, struct mmap_params *mp)148{149 int delta_max, i, prio, ret;150 151 map->aio.nr_cblocks = mp->nr_cblocks;152 if (map->aio.nr_cblocks) {153 map->aio.aiocb = calloc(map->aio.nr_cblocks, sizeof(struct aiocb *));154 if (!map->aio.aiocb) {155 pr_debug2("failed to allocate aiocb for data buffer, error %m\n");156 return -1;157 }158 map->aio.cblocks = calloc(map->aio.nr_cblocks, sizeof(struct aiocb));159 if (!map->aio.cblocks) {160 pr_debug2("failed to allocate cblocks for data buffer, error %m\n");161 return -1;162 }163 map->aio.data = calloc(map->aio.nr_cblocks, sizeof(void *));164 if (!map->aio.data) {165 pr_debug2("failed to allocate data buffer, error %m\n");166 return -1;167 }168 delta_max = sysconf(_SC_AIO_PRIO_DELTA_MAX);169 for (i = 0; i < map->aio.nr_cblocks; ++i) {170 ret = perf_mmap__aio_alloc(map, i);171 if (ret == -1) {172 pr_debug2("failed to allocate data buffer area, error %m");173 return -1;174 }175 ret = perf_mmap__aio_bind(map, i, map->core.cpu, mp->affinity);176 if (ret == -1)177 return -1;178 /*179 * Use cblock.aio_fildes value different from -1180 * to denote started aio write operation on the181 * cblock so it requires explicit record__aio_sync()182 * call prior the cblock may be reused again.183 */184 map->aio.cblocks[i].aio_fildes = -1;185 /*186 * Allocate cblocks with priority delta to have187 * faster aio write system calls because queued requests188 * are kept in separate per-prio queues and adding189 * a new request will iterate thru shorter per-prio190 * list. Blocks with numbers higher than191 * _SC_AIO_PRIO_DELTA_MAX go with priority 0.192 */193 prio = delta_max - i;194 map->aio.cblocks[i].aio_reqprio = prio >= 0 ? prio : 0;195 }196 }197 198 return 0;199}200 201static void perf_mmap__aio_munmap(struct mmap *map)202{203 int i;204 205 for (i = 0; i < map->aio.nr_cblocks; ++i)206 perf_mmap__aio_free(map, i);207 if (map->aio.data)208 zfree(&map->aio.data);209 zfree(&map->aio.cblocks);210 zfree(&map->aio.aiocb);211}212#else /* !HAVE_AIO_SUPPORT */213static int perf_mmap__aio_enabled(struct mmap *map __maybe_unused)214{215 return 0;216}217 218static int perf_mmap__aio_mmap(struct mmap *map __maybe_unused,219 struct mmap_params *mp __maybe_unused)220{221 return 0;222}223 224static void perf_mmap__aio_munmap(struct mmap *map __maybe_unused)225{226}227#endif228 229void mmap__munmap(struct mmap *map)230{231 bitmap_free(map->affinity_mask.bits);232 233 zstd_fini(&map->zstd_data);234 235 perf_mmap__aio_munmap(map);236 if (map->data != NULL) {237 munmap(map->data, mmap__mmap_len(map));238 map->data = NULL;239 }240 auxtrace_mmap__munmap(&map->auxtrace_mmap);241}242 243static void build_node_mask(int node, struct mmap_cpu_mask *mask)244{245 int idx, nr_cpus;246 struct perf_cpu cpu;247 const struct perf_cpu_map *cpu_map = NULL;248 249 cpu_map = cpu_map__online();250 if (!cpu_map)251 return;252 253 nr_cpus = perf_cpu_map__nr(cpu_map);254 for (idx = 0; idx < nr_cpus; idx++) {255 cpu = perf_cpu_map__cpu(cpu_map, idx); /* map c index to online cpu index */256 if (cpu__get_node(cpu) == node)257 __set_bit(cpu.cpu, mask->bits);258 }259}260 261static int perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params *mp)262{263 map->affinity_mask.nbits = cpu__max_cpu().cpu;264 map->affinity_mask.bits = bitmap_zalloc(map->affinity_mask.nbits);265 if (!map->affinity_mask.bits)266 return -1;267 268 if (mp->affinity == PERF_AFFINITY_NODE && cpu__max_node() > 1)269 build_node_mask(cpu__get_node(map->core.cpu), &map->affinity_mask);270 else if (mp->affinity == PERF_AFFINITY_CPU)271 __set_bit(map->core.cpu.cpu, map->affinity_mask.bits);272 273 return 0;274}275 276int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, struct perf_cpu cpu)277{278 if (perf_mmap__mmap(&map->core, &mp->core, fd, cpu)) {279 pr_debug2("failed to mmap perf event ring buffer, error %d\n",280 errno);281 return -1;282 }283 284 if (mp->affinity != PERF_AFFINITY_SYS &&285 perf_mmap__setup_affinity_mask(map, mp)) {286 pr_debug2("failed to alloc mmap affinity mask, error %d\n",287 errno);288 return -1;289 }290 291 if (verbose == 2)292 mmap_cpu_mask__scnprintf(&map->affinity_mask, "mmap");293 294 map->core.flush = mp->flush;295 296 if (zstd_init(&map->zstd_data, mp->comp_level)) {297 pr_debug2("failed to init mmap compressor, error %d\n", errno);298 return -1;299 }300 301 if (mp->comp_level && !perf_mmap__aio_enabled(map)) {302 map->data = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE,303 MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);304 if (map->data == MAP_FAILED) {305 pr_debug2("failed to mmap data buffer, error %d\n",306 errno);307 map->data = NULL;308 return -1;309 }310 }311 312 if (auxtrace_mmap__mmap(&map->auxtrace_mmap,313 &mp->auxtrace_mp, map->core.base, fd))314 return -1;315 316 return perf_mmap__aio_mmap(map, mp);317}318 319int perf_mmap__push(struct mmap *md, void *to,320 int push(struct mmap *map, void *to, void *buf, size_t size))321{322 u64 head = perf_mmap__read_head(&md->core);323 unsigned char *data = md->core.base + page_size;324 unsigned long size;325 void *buf;326 int rc = 0;327 328 rc = perf_mmap__read_init(&md->core);329 if (rc < 0)330 return (rc == -EAGAIN) ? 1 : -1;331 332 size = md->core.end - md->core.start;333 334 if ((md->core.start & md->core.mask) + size != (md->core.end & md->core.mask)) {335 buf = &data[md->core.start & md->core.mask];336 size = md->core.mask + 1 - (md->core.start & md->core.mask);337 md->core.start += size;338 339 if (push(md, to, buf, size) < 0) {340 rc = -1;341 goto out;342 }343 }344 345 buf = &data[md->core.start & md->core.mask];346 size = md->core.end - md->core.start;347 md->core.start += size;348 349 if (push(md, to, buf, size) < 0) {350 rc = -1;351 goto out;352 }353 354 md->core.prev = head;355 perf_mmap__consume(&md->core);356out:357 return rc;358}359 360int mmap_cpu_mask__duplicate(struct mmap_cpu_mask *original, struct mmap_cpu_mask *clone)361{362 clone->nbits = original->nbits;363 clone->bits = bitmap_zalloc(original->nbits);364 if (!clone->bits)365 return -ENOMEM;366 367 memcpy(clone->bits, original->bits, MMAP_CPU_MASK_BYTES(original));368 return 0;369}370