tools/perf/util/header.c

   1 #include <sys/types.h>
   2 #include <unistd.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <linux/list.h>
   6
   7 #include "util.h"
   8 #include "header.h"
   9 #include "../perf.h"
  10 #include "trace-event.h"
  11 #include "symbol.h"
  12 #include "data_map.h"
  13 #include "debug.h"
  14
  15 /*
  16  * Create new perf.data header attribute:
  17  */
  18 struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
  19 {
  20         struct perf_header_attr *self = malloc(sizeof(*self));
  21
  22         if (self != NULL) {
  23                 self->attr = *attr;
  24                 self->ids  = 0;
  25                 self->size = 1;
  26                 self->id   = malloc(sizeof(u64));
  27                 if (self->id == NULL) {
  28                         free(self);
  29                         self = NULL;
  30                 }
  31         }
  32
  33         return self;
  34 }
  35
  36 void perf_header_attr__delete(struct perf_header_attr *self)
  37 {
  38         free(self->id);
  39         free(self);
  40 }
  41
  42 int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
  43 {
  44         int pos = self->ids;
  45
  46         self->ids++;
  47         if (self->ids > self->size) {
  48                 int nsize = self->size * 2;
  49                 u64 *nid = realloc(self->id, nsize * sizeof(u64));
  50
  51                 if (nid == NULL)
  52                         return -1;
  53
  54                 self->size = nsize;
  55                 self->id = nid;
  56         }
  57         self->id[pos] = id;
  58         return 0;
  59 }
  60
  61 /*
  62  * Create new perf.data header:
  63  */
  64 struct perf_header *perf_header__new(void)
  65 {
  66         struct perf_header *self = calloc(sizeof(*self), 1);
  67
  68         if (self != NULL) {
  69                 self->size = 1;
  70                 self->attr = malloc(sizeof(void *));
  71
  72                 if (self->attr == NULL) {
  73                         free(self);
  74                         self = NULL;
  75                 }
  76         }
  77
  78         return self;
  79 }
  80
  81 void perf_header__delete(struct perf_header *self)
  82 {
  83         int i;
  84
  85         for (i = 0; i < self->attrs; ++i)
  86                 perf_header_attr__delete(self->attr[i]);
  87
  88         free(self->attr);
  89         free(self);
  90 }
  91
  92 int perf_header__add_attr(struct perf_header *self,
  93                           struct perf_header_attr *attr)
  94 {
  95         if (self->frozen)
  96                 return -1;
  97
  98         if (self->attrs == self->size) {
  99                 int nsize = self->size * 2;
 100                 struct perf_header_attr **nattr;
 101
 102                 nattr = realloc(self->attr, nsize * sizeof(void *));
 103                 if (nattr == NULL)
 104                         return -1;
 105
 106                 self->size = nsize;
 107                 self->attr = nattr;
 108         }
 109
 110         self->attr[self->attrs++] = attr;
 111         return 0;
 112 }
 113
 114 #define MAX_EVENT_NAME 64
 115
 116 struct perf_trace_event_type {
 117         u64     event_id;
 118         char    name[MAX_EVENT_NAME];
 119 };
 120
 121 static int event_count;
 122 static struct perf_trace_event_type *events;
 123
 124 void perf_header__push_event(u64 id, const char *name)
 125 {
 126         if (strlen(name) > MAX_EVENT_NAME)
 127                 pr_warning("Event %s will be truncated\n", name);
 128
 129         if (!events) {
 130                 events = malloc(sizeof(struct perf_trace_event_type));
 131                 if (!events)
 132                         die("nomem");
 133         } else {
 134                 events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
 135                 if (!events)
 136                         die("nomem");
 137         }
 138         memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
 139         events[event_count].event_id = id;
 140         strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
 141         event_count++;
 142 }
 143
 144 char *perf_header__find_event(u64 id)
 145 {
 146         int i;
 147         for (i = 0 ; i < event_count; i++) {
 148                 if (events[i].event_id == id)
 149                         return events[i].name;
 150         }
 151         return NULL;
 152 }
 153
 154 static const char *__perf_magic = "PERFFILE";
 155
 156 #define PERF_MAGIC      (*(u64 *)__perf_magic)
 157
 158 struct perf_file_attr {
 159         struct perf_event_attr  attr;
 160         struct perf_file_section        ids;
 161 };
 162
 163 void perf_header__set_feat(struct perf_header *self, int feat)
 164 {
 165         set_bit(feat, self->adds_features);
 166 }
 167
 168 bool perf_header__has_feat(const struct perf_header *self, int feat)
 169 {
 170         return test_bit(feat, self->adds_features);
 171 }
 172
 173 static int do_write(int fd, const void *buf, size_t size)
 174 {
 175         while (size) {
 176                 int ret = write(fd, buf, size);
 177
 178                 if (ret < 0)
 179                         return -errno;
 180
 181                 size -= ret;
 182                 buf += ret;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int dsos__write_buildid_table(int fd)
 189 {
 190         struct dso *pos;
 191
 192         list_for_each_entry(pos, &dsos, node) {
 193                 int err;
 194                 struct build_id_event b;
 195                 size_t len;
 196
 197                 if (!pos->has_build_id)
 198                         continue;
 199                 len = pos->long_name_len + 1;
 200                 len = ALIGN(len, 64);
 201                 memset(&b, 0, sizeof(b));
 202                 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
 203                 b.header.size = sizeof(b) + len;
 204                 err = do_write(fd, &b, sizeof(b));
 205                 if (err < 0)
 206                         return err;
 207                 err = do_write(fd, pos->long_name, len);
 208                 if (err < 0)
 209                         return err;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int perf_header__adds_write(struct perf_header *self, int fd)
 216 {
 217         int nr_sections;
 218         struct perf_file_section *feat_sec;
 219         int sec_size;
 220         u64 sec_start;
 221         int idx = 0, err;
 222
 223         if (dsos__read_build_ids())
 224                 perf_header__set_feat(self, HEADER_BUILD_ID);
 225
 226         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 227         if (!nr_sections)
 228                 return 0;
 229
 230         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 231         if (feat_sec == NULL)
 232                 return -ENOMEM;
 233
 234         sec_size = sizeof(*feat_sec) * nr_sections;
 235
 236         sec_start = self->data_offset + self->data_size;
 237         lseek(fd, sec_start + sec_size, SEEK_SET);
 238
 239         if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
 240                 struct perf_file_section *trace_sec;
 241
 242                 trace_sec = &feat_sec[idx++];
 243
 244                 /* Write trace info */
 245                 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
 246                 read_tracing_data(fd, attrs, nr_counters);
 247                 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
 248         }
 249
 250
 251         if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
 252                 struct perf_file_section *buildid_sec;
 253
 254                 buildid_sec = &feat_sec[idx++];
 255
 256                 dsos__load_kernel();
 257                 /*
 258                  * Read the list of loaded modules with its build_ids
 259                  */
 260                 dsos__load_modules();
 261
 262                 /* Write build-ids */
 263                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
 264                 err = dsos__write_buildid_table(fd);
 265                 if (err < 0) {
 266                         pr_debug("failed to write buildid table\n");
 267                         goto out_free;
 268                 }
 269                 buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
 270         }
 271
 272         lseek(fd, sec_start, SEEK_SET);
 273         err = do_write(fd, feat_sec, sec_size);
 274         if (err < 0)
 275                 pr_debug("failed to write feature section\n");
 276 out_free:
 277         free(feat_sec);
 278         return err;
 279 }
 280
 281 int perf_header__write(struct perf_header *self, int fd, bool at_exit)
 282 {
 283         struct perf_file_header f_header;
 284         struct perf_file_attr   f_attr;
 285         struct perf_header_attr *attr;
 286         int i, err;
 287
 288         lseek(fd, sizeof(f_header), SEEK_SET);
 289
 290
 291         for (i = 0; i < self->attrs; i++) {
 292                 attr = self->attr[i];
 293
 294                 attr->id_offset = lseek(fd, 0, SEEK_CUR);
 295                 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
 296                 if (err < 0) {
 297                         pr_debug("failed to write perf header\n");
 298                         return err;
 299                 }
 300         }
 301
 302
 303         self->attr_offset = lseek(fd, 0, SEEK_CUR);
 304
 305         for (i = 0; i < self->attrs; i++) {
 306                 attr = self->attr[i];
 307
 308                 f_attr = (struct perf_file_attr){
 309                         .attr = attr->attr,
 310                         .ids  = {
 311                                 .offset = attr->id_offset,
 312                                 .size   = attr->ids * sizeof(u64),
 313                         }
 314                 };
 315                 err = do_write(fd, &f_attr, sizeof(f_attr));
 316                 if (err < 0) {
 317                         pr_debug("failed to write perf header attribute\n");
 318                         return err;
 319                 }
 320         }
 321
 322         self->event_offset = lseek(fd, 0, SEEK_CUR);
 323         self->event_size = event_count * sizeof(struct perf_trace_event_type);
 324         if (events) {
 325                 err = do_write(fd, events, self->event_size);
 326                 if (err < 0) {
 327                         pr_debug("failed to write perf header events\n");
 328                         return err;
 329                 }
 330         }
 331
 332         self->data_offset = lseek(fd, 0, SEEK_CUR);
 333
 334         if (at_exit) {
 335                 err = perf_header__adds_write(self, fd);
 336                 if (err < 0)
 337                         return err;
 338         }
 339
 340         f_header = (struct perf_file_header){
 341                 .magic     = PERF_MAGIC,
 342                 .size      = sizeof(f_header),
 343                 .attr_size = sizeof(f_attr),
 344                 .attrs = {
 345                         .offset = self->attr_offset,
 346                         .size   = self->attrs * sizeof(f_attr),
 347                 },
 348                 .data = {
 349                         .offset = self->data_offset,
 350                         .size   = self->data_size,
 351                 },
 352                 .event_types = {
 353                         .offset = self->event_offset,
 354                         .size   = self->event_size,
 355                 },
 356         };
 357
 358         memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 359
 360         lseek(fd, 0, SEEK_SET);
 361         err = do_write(fd, &f_header, sizeof(f_header));
 362         if (err < 0) {
 363                 pr_debug("failed to write perf header\n");
 364                 return err;
 365         }
 366         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 367
 368         self->frozen = 1;
 369         return 0;
 370 }
 371
 372 static void do_read(int fd, void *buf, size_t size)
 373 {
 374         while (size) {
 375                 int ret = read(fd, buf, size);
 376
 377                 if (ret < 0)
 378                         die("failed to read");
 379                 if (ret == 0)
 380                         die("failed to read: missing data");
 381
 382                 size -= ret;
 383                 buf += ret;
 384         }
 385 }
 386
 387 int perf_header__process_sections(struct perf_header *self, int fd,
 388                                   int (*process)(struct perf_file_section *self,
 389                                                  int feat, int fd))
 390 {
 391         struct perf_file_section *feat_sec;
 392         int nr_sections;
 393         int sec_size;
 394         int idx = 0;
 395         int err = 0, feat = 1;
 396
 397         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 398         if (!nr_sections)
 399                 return 0;
 400
 401         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 402         if (!feat_sec)
 403                 return -1;
 404
 405         sec_size = sizeof(*feat_sec) * nr_sections;
 406
 407         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 408
 409         do_read(fd, feat_sec, sec_size);
 410
 411         while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
 412                 if (perf_header__has_feat(self, feat)) {
 413                         struct perf_file_section *sec = &feat_sec[idx++];
 414
 415                         err = process(sec, feat, fd);
 416                         if (err < 0)
 417                                 break;
 418                 }
 419                 ++feat;
 420         }
 421
 422         free(feat_sec);
 423         return err;
 424 };
 425
 426 int perf_file_header__read(struct perf_file_header *self,
 427                            struct perf_header *ph, int fd)
 428 {
 429         lseek(fd, 0, SEEK_SET);
 430         do_read(fd, self, sizeof(*self));
 431
 432         if (self->magic     != PERF_MAGIC ||
 433             self->attr_size != sizeof(struct perf_file_attr))
 434                 return -1;
 435
 436         if (self->size != sizeof(*self)) {
 437                 /* Support the previous format */
 438                 if (self->size == offsetof(typeof(*self), adds_features))
 439                         bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
 440                 else
 441                         return -1;
 442         }
 443
 444         memcpy(&ph->adds_features, &self->adds_features,
 445                sizeof(self->adds_features));
 446
 447         ph->event_offset = self->event_types.offset;
 448         ph->event_size   = self->event_types.size;
 449         ph->data_offset  = self->data.offset;
 450         ph->data_size    = self->data.size;
 451         return 0;
 452 }
 453
 454 static int perf_file_section__process(struct perf_file_section *self,
 455                                       int feat, int fd)
 456 {
 457         if (lseek(fd, self->offset, SEEK_SET) < 0) {
 458                 pr_debug("Failed to lseek to %Ld offset for feature %d, "
 459                          "continuing...\n", self->offset, feat);
 460                 return 0;
 461         }
 462
 463         switch (feat) {
 464         case HEADER_TRACE_INFO:
 465                 trace_report(fd);
 466                 break;
 467
 468         case HEADER_BUILD_ID:
 469                 if (perf_header__read_build_ids(fd, self->offset, self->size))
 470                         pr_debug("Failed to read buildids, continuing...\n");
 471                 break;
 472         default:
 473                 pr_debug("unknown feature %d, continuing...\n", feat);
 474         }
 475
 476         return 0;
 477 }
 478
 479 int perf_header__read(struct perf_header *self, int fd)
 480 {
 481         struct perf_file_header f_header;
 482         struct perf_file_attr   f_attr;
 483         u64                     f_id;
 484         int nr_attrs, nr_ids, i, j;
 485
 486         if (perf_file_header__read(&f_header, self, fd) < 0) {
 487                 pr_debug("incompatible file format\n");
 488                 return -EINVAL;
 489         }
 490
 491         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 492         lseek(fd, f_header.attrs.offset, SEEK_SET);
 493
 494         for (i = 0; i < nr_attrs; i++) {
 495                 struct perf_header_attr *attr;
 496                 off_t tmp;
 497
 498                 do_read(fd, &f_attr, sizeof(f_attr));
 499                 tmp = lseek(fd, 0, SEEK_CUR);
 500
 501                 attr = perf_header_attr__new(&f_attr.attr);
 502                 if (attr == NULL)
 503                          return -ENOMEM;
 504
 505                 nr_ids = f_attr.ids.size / sizeof(u64);
 506                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 507
 508                 for (j = 0; j < nr_ids; j++) {
 509                         do_read(fd, &f_id, sizeof(f_id));
 510
 511                         if (perf_header_attr__add_id(attr, f_id) < 0) {
 512                                 perf_header_attr__delete(attr);
 513                                 return -ENOMEM;
 514                         }
 515                 }
 516                 if (perf_header__add_attr(self, attr) < 0) {
 517                         perf_header_attr__delete(attr);
 518                         return -ENOMEM;
 519                 }
 520
 521                 lseek(fd, tmp, SEEK_SET);
 522         }
 523
 524         if (f_header.event_types.size) {
 525                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 526                 events = malloc(f_header.event_types.size);
 527                 if (events == NULL)
 528                         return -ENOMEM;
 529                 do_read(fd, events, f_header.event_types.size);
 530                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 531         }
 532
 533         perf_header__process_sections(self, fd, perf_file_section__process);
 534
 535         lseek(fd, self->data_offset, SEEK_SET);
 536
 537         self->frozen = 1;
 538         return 0;
 539 }
 540
 541 u64 perf_header__sample_type(struct perf_header *header)
 542 {
 543         u64 type = 0;
 544         int i;
 545
 546         for (i = 0; i < header->attrs; i++) {
 547                 struct perf_header_attr *attr = header->attr[i];
 548
 549                 if (!type)
 550                         type = attr->attr.sample_type;
 551                 else if (type != attr->attr.sample_type)
 552                         die("non matching sample_type");
 553         }
 554
 555         return type;
 556 }
 557
 558 struct perf_event_attr *
 559 perf_header__find_attr(u64 id, struct perf_header *header)
 560 {
 561         int i;
 562
 563         for (i = 0; i < header->attrs; i++) {
 564                 struct perf_header_attr *attr = header->attr[i];
 565                 int j;
 566
 567                 for (j = 0; j < attr->ids; j++) {
 568                         if (attr->id[j] == id)
 569                                 return &attr->attr;
 570                 }
 571         }
 572
 573         return NULL;
 574 }