1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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 further 6 * 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_SUPPORT 18 #include <numaif.h> 19 #endif 20 #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 1023 29 void 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 39 size_t mmap__mmap_len(struct mmap *map) 40 { 41 return perf_mmap__mmap_len(&map->core); 42 } 43 44 int __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 52 void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused) 53 { 54 } 55 56 void __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 63 void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __maybe_unused, 64 struct evlist *evlist __maybe_unused, 65 int idx __maybe_unused, 66 bool per_cpu __maybe_unused) 67 { 68 } 69 70 #ifdef HAVE_AIO_SUPPORT 71 static int perf_mmap__aio_enabled(struct mmap *map) 72 { 73 return map->aio.nr_cblocks > 0; 74 } 75 76 #ifdef HAVE_LIBNUMA_SUPPORT 77 static 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 89 static 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 97 static int perf_mmap__aio_bind(struct mmap *map, int idx, int 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 */ 126 static 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 } 134 135 static void perf_mmap__aio_free(struct mmap *map, int idx) 136 { 137 zfree(&(map->aio.data[idx])); 138 } 139 140 static int perf_mmap__aio_bind(struct mmap *map __maybe_unused, int idx __maybe_unused, 141 int cpu __maybe_unused, int affinity __maybe_unused) 142 { 143 return 0; 144 } 145 #endif 146 147 static 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 -1 180 * to denote started aio write operation on the 181 * 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 have 187 * faster aio write system calls because queued requests 188 * are kept in separate per-prio queues and adding 189 * a new request will iterate thru shorter per-prio 190 * list. Blocks with numbers higher than 191 * _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 } 200 201 static 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 */ 213 static int perf_mmap__aio_enabled(struct mmap *map __maybe_unused) 214 { 215 return 0; 216 } 217 218 static int perf_mmap__aio_mmap(struct mmap *map __maybe_unused, 219 struct mmap_params *mp __maybe_unused) 220 { 221 return 0; 222 } 223 224 static void perf_mmap__aio_munmap(struct mmap *map __maybe_unused) 225 { 226 } 227 #endif 228 229 void mmap__munmap(struct mmap *map) 230 { 231 bitmap_free(map->affinity_mask.bits); 232 233 perf_mmap__aio_munmap(map); 234 if (map->data != NULL) { 235 munmap(map->data, mmap__mmap_len(map)); 236 map->data = NULL; 237 } 238 auxtrace_mmap__munmap(&map->auxtrace_mmap); 239 } 240 241 static void build_node_mask(int node, struct mmap_cpu_mask *mask) 242 { 243 int c, cpu, nr_cpus; 244 const struct perf_cpu_map *cpu_map = NULL; 245 246 cpu_map = cpu_map__online(); 247 if (!cpu_map) 248 return; 249 250 nr_cpus = perf_cpu_map__nr(cpu_map); 251 for (c = 0; c < nr_cpus; c++) { 252 cpu = cpu_map->map[c]; /* map c index to online cpu index */ 253 if (cpu__get_node(cpu) == node) 254 set_bit(cpu, mask->bits); 255 } 256 } 257 258 static int perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params *mp) 259 { 260 map->affinity_mask.nbits = cpu__max_cpu(); 261 map->affinity_mask.bits = bitmap_zalloc(map->affinity_mask.nbits); 262 if (!map->affinity_mask.bits) 263 return -1; 264 265 if (mp->affinity == PERF_AFFINITY_NODE && cpu__max_node() > 1) 266 build_node_mask(cpu__get_node(map->core.cpu), &map->affinity_mask); 267 else if (mp->affinity == PERF_AFFINITY_CPU) 268 set_bit(map->core.cpu, map->affinity_mask.bits); 269 270 return 0; 271 } 272 273 int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu) 274 { 275 if (perf_mmap__mmap(&map->core, &mp->core, fd, cpu)) { 276 pr_debug2("failed to mmap perf event ring buffer, error %d\n", 277 errno); 278 return -1; 279 } 280 281 if (mp->affinity != PERF_AFFINITY_SYS && 282 perf_mmap__setup_affinity_mask(map, mp)) { 283 pr_debug2("failed to alloc mmap affinity mask, error %d\n", 284 errno); 285 return -1; 286 } 287 288 if (verbose == 2) 289 mmap_cpu_mask__scnprintf(&map->affinity_mask, "mmap"); 290 291 map->core.flush = mp->flush; 292 293 map->comp_level = mp->comp_level; 294 295 if (map->comp_level && !perf_mmap__aio_enabled(map)) { 296 map->data = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE, 297 MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); 298 if (map->data == MAP_FAILED) { 299 pr_debug2("failed to mmap data buffer, error %d\n", 300 errno); 301 map->data = NULL; 302 return -1; 303 } 304 } 305 306 if (auxtrace_mmap__mmap(&map->auxtrace_mmap, 307 &mp->auxtrace_mp, map->core.base, fd)) 308 return -1; 309 310 return perf_mmap__aio_mmap(map, mp); 311 } 312 313 int perf_mmap__push(struct mmap *md, void *to, 314 int push(struct mmap *map, void *to, void *buf, size_t size)) 315 { 316 u64 head = perf_mmap__read_head(&md->core); 317 unsigned char *data = md->core.base + page_size; 318 unsigned long size; 319 void *buf; 320 int rc = 0; 321 322 rc = perf_mmap__read_init(&md->core); 323 if (rc < 0) 324 return (rc == -EAGAIN) ? 1 : -1; 325 326 size = md->core.end - md->core.start; 327 328 if ((md->core.start & md->core.mask) + size != (md->core.end & md->core.mask)) { 329 buf = &data[md->core.start & md->core.mask]; 330 size = md->core.mask + 1 - (md->core.start & md->core.mask); 331 md->core.start += size; 332 333 if (push(md, to, buf, size) < 0) { 334 rc = -1; 335 goto out; 336 } 337 } 338 339 buf = &data[md->core.start & md->core.mask]; 340 size = md->core.end - md->core.start; 341 md->core.start += size; 342 343 if (push(md, to, buf, size) < 0) { 344 rc = -1; 345 goto out; 346 } 347 348 md->core.prev = head; 349 perf_mmap__consume(&md->core); 350 out: 351 return rc; 352 } 353