SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 = zalloc(sizeof(*self));
  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(struct list_head *head, int fd)
 189 {
 190 #define NAME_ALIGN      64
 191         struct dso *pos;
 192         static const char zero_buf[NAME_ALIGN];
 193
 194         list_for_each_entry(pos, head, node) {
 195                 int err;
 196                 struct build_id_event b;
 197                 size_t len;
 198
 199                 if (!pos->has_build_id)
 200                         continue;
 201                 len = pos->long_name_len + 1;
 202                 len = ALIGN(len, NAME_ALIGN);
 203                 memset(&b, 0, sizeof(b));
 204                 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
 205                 b.header.size = sizeof(b) + len;
 206                 err = do_write(fd, &b, sizeof(b));
 207                 if (err < 0)
 208                         return err;
 209                 err = do_write(fd, pos->long_name, pos->long_name_len + 1);
 210                 if (err < 0)
 211                         return err;
 212                 err = do_write(fd, zero_buf, len - pos->long_name_len - 1);
 213                 if (err < 0)
 214                         return err;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int dsos__write_buildid_table(int fd)
 221 {
 222         int err = __dsos__write_buildid_table(&dsos__kernel, fd);
 223         if (err == 0)
 224                 err = __dsos__write_buildid_table(&dsos__user, fd);
 225         return err;
 226 }
 227
 228 static int perf_header__adds_write(struct perf_header *self, int fd)
 229 {
 230         int nr_sections;
 231         struct perf_file_section *feat_sec;
 232         int sec_size;
 233         u64 sec_start;
 234         int idx = 0, err;
 235
 236         if (dsos__read_build_ids())
 237                 perf_header__set_feat(self, HEADER_BUILD_ID);
 238
 239         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 240         if (!nr_sections)
 241                 return 0;
 242
 243         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 244         if (feat_sec == NULL)
 245                 return -ENOMEM;
 246
 247         sec_size = sizeof(*feat_sec) * nr_sections;
 248
 249         sec_start = self->data_offset + self->data_size;
 250         lseek(fd, sec_start + sec_size, SEEK_SET);
 251
 252         if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
 253                 struct perf_file_section *trace_sec;
 254
 255                 trace_sec = &feat_sec[idx++];
 256
 257                 /* Write trace info */
 258                 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
 259                 read_tracing_data(fd, attrs, nr_counters);
 260                 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
 261         }
 262
 263
 264         if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
 265                 struct perf_file_section *buildid_sec;
 266
 267                 buildid_sec = &feat_sec[idx++];
 268
 269                 /* Write build-ids */
 270                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
 271                 err = dsos__write_buildid_table(fd);
 272                 if (err < 0) {
 273                         pr_debug("failed to write buildid table\n");
 274                         goto out_free;
 275                 }
 276                 buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
 277         }
 278
 279         lseek(fd, sec_start, SEEK_SET);
 280         err = do_write(fd, feat_sec, sec_size);
 281         if (err < 0)
 282                 pr_debug("failed to write feature section\n");
 283 out_free:
 284         free(feat_sec);
 285         return err;
 286 }
 287
 288 int perf_header__write(struct perf_header *self, int fd, bool at_exit)
 289 {
 290         struct perf_file_header f_header;
 291         struct perf_file_attr   f_attr;
 292         struct perf_header_attr *attr;
 293         int i, err;
 294
 295         lseek(fd, sizeof(f_header), SEEK_SET);
 296
 297
 298         for (i = 0; i < self->attrs; i++) {
 299                 attr = self->attr[i];
 300
 301                 attr->id_offset = lseek(fd, 0, SEEK_CUR);
 302                 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
 303                 if (err < 0) {
 304                         pr_debug("failed to write perf header\n");
 305                         return err;
 306                 }
 307         }
 308
 309
 310         self->attr_offset = lseek(fd, 0, SEEK_CUR);
 311
 312         for (i = 0; i < self->attrs; i++) {
 313                 attr = self->attr[i];
 314
 315                 f_attr = (struct perf_file_attr){
 316                         .attr = attr->attr,
 317                         .ids  = {
 318                                 .offset = attr->id_offset,
 319                                 .size   = attr->ids * sizeof(u64),
 320                         }
 321                 };
 322                 err = do_write(fd, &f_attr, sizeof(f_attr));
 323                 if (err < 0) {
 324                         pr_debug("failed to write perf header attribute\n");
 325                         return err;
 326                 }
 327         }
 328
 329         self->event_offset = lseek(fd, 0, SEEK_CUR);
 330         self->event_size = event_count * sizeof(struct perf_trace_event_type);
 331         if (events) {
 332                 err = do_write(fd, events, self->event_size);
 333                 if (err < 0) {
 334                         pr_debug("failed to write perf header events\n");
 335                         return err;
 336                 }
 337         }
 338
 339         self->data_offset = lseek(fd, 0, SEEK_CUR);
 340
 341         if (at_exit) {
 342                 err = perf_header__adds_write(self, fd);
 343                 if (err < 0)
 344                         return err;
 345         }
 346
 347         f_header = (struct perf_file_header){
 348                 .magic     = PERF_MAGIC,
 349                 .size      = sizeof(f_header),
 350                 .attr_size = sizeof(f_attr),
 351                 .attrs = {
 352                         .offset = self->attr_offset,
 353                         .size   = self->attrs * sizeof(f_attr),
 354                 },
 355                 .data = {
 356                         .offset = self->data_offset,
 357                         .size   = self->data_size,
 358                 },
 359                 .event_types = {
 360                         .offset = self->event_offset,
 361                         .size   = self->event_size,
 362                 },
 363         };
 364
 365         memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 366
 367         lseek(fd, 0, SEEK_SET);
 368         err = do_write(fd, &f_header, sizeof(f_header));
 369         if (err < 0) {
 370                 pr_debug("failed to write perf header\n");
 371                 return err;
 372         }
 373         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 374
 375         self->frozen = 1;
 376         return 0;
 377 }
 378
 379 static void do_read(int fd, void *buf, size_t size)
 380 {
 381         while (size) {
 382                 int ret = read(fd, buf, size);
 383
 384                 if (ret < 0)
 385                         die("failed to read");
 386                 if (ret == 0)
 387                         die("failed to read: missing data");
 388
 389                 size -= ret;
 390                 buf += ret;
 391         }
 392 }
 393
 394 int perf_header__process_sections(struct perf_header *self, int fd,
 395                                   int (*process)(struct perf_file_section *self,
 396                                                  int feat, int fd))
 397 {
 398         struct perf_file_section *feat_sec;
 399         int nr_sections;
 400         int sec_size;
 401         int idx = 0;
 402         int err = 0, feat = 1;
 403
 404         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 405         if (!nr_sections)
 406                 return 0;
 407
 408         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 409         if (!feat_sec)
 410                 return -1;
 411
 412         sec_size = sizeof(*feat_sec) * nr_sections;
 413
 414         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 415
 416         do_read(fd, feat_sec, sec_size);
 417
 418         while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
 419                 if (perf_header__has_feat(self, feat)) {
 420                         struct perf_file_section *sec = &feat_sec[idx++];
 421
 422                         err = process(sec, feat, fd);
 423                         if (err < 0)
 424                                 break;
 425                 }
 426                 ++feat;
 427         }
 428
 429         free(feat_sec);
 430         return err;
 431 };
 432
 433 int perf_file_header__read(struct perf_file_header *self,
 434                            struct perf_header *ph, int fd)
 435 {
 436         lseek(fd, 0, SEEK_SET);
 437         do_read(fd, self, sizeof(*self));
 438
 439         if (self->magic     != PERF_MAGIC ||
 440             self->attr_size != sizeof(struct perf_file_attr))
 441                 return -1;
 442
 443         if (self->size != sizeof(*self)) {
 444                 /* Support the previous format */
 445                 if (self->size == offsetof(typeof(*self), adds_features))
 446                         bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
 447                 else
 448                         return -1;
 449         }
 450
 451         memcpy(&ph->adds_features, &self->adds_features,
 452                sizeof(self->adds_features));
 453
 454         ph->event_offset = self->event_types.offset;
 455         ph->event_size   = self->event_types.size;
 456         ph->data_offset  = self->data.offset;
 457         ph->data_size    = self->data.size;
 458         return 0;
 459 }
 460
 461 static int perf_file_section__process(struct perf_file_section *self,
 462                                       int feat, int fd)
 463 {
 464         if (lseek(fd, self->offset, SEEK_SET) < 0) {
 465                 pr_debug("Failed to lseek to %Ld offset for feature %d, "
 466                          "continuing...\n", self->offset, feat);
 467                 return 0;
 468         }
 469
 470         switch (feat) {
 471         case HEADER_TRACE_INFO:
 472                 trace_report(fd);
 473                 break;
 474
 475         case HEADER_BUILD_ID:
 476                 if (perf_header__read_build_ids(fd, self->offset, self->size))
 477                         pr_debug("Failed to read buildids, continuing...\n");
 478                 break;
 479         default:
 480                 pr_debug("unknown feature %d, continuing...\n", feat);
 481         }
 482
 483         return 0;
 484 }
 485
 486 int perf_header__read(struct perf_header *self, int fd)
 487 {
 488         struct perf_file_header f_header;
 489         struct perf_file_attr   f_attr;
 490         u64                     f_id;
 491         int nr_attrs, nr_ids, i, j;
 492
 493         if (perf_file_header__read(&f_header, self, fd) < 0) {
 494                 pr_debug("incompatible file format\n");
 495                 return -EINVAL;
 496         }
 497
 498         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 499         lseek(fd, f_header.attrs.offset, SEEK_SET);
 500
 501         for (i = 0; i < nr_attrs; i++) {
 502                 struct perf_header_attr *attr;
 503                 off_t tmp;
 504
 505                 do_read(fd, &f_attr, sizeof(f_attr));
 506                 tmp = lseek(fd, 0, SEEK_CUR);
 507
 508                 attr = perf_header_attr__new(&f_attr.attr);
 509                 if (attr == NULL)
 510                          return -ENOMEM;
 511
 512                 nr_ids = f_attr.ids.size / sizeof(u64);
 513                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 514
 515                 for (j = 0; j < nr_ids; j++) {
 516                         do_read(fd, &f_id, sizeof(f_id));
 517
 518                         if (perf_header_attr__add_id(attr, f_id) < 0) {
 519                                 perf_header_attr__delete(attr);
 520                                 return -ENOMEM;
 521                         }
 522                 }
 523                 if (perf_header__add_attr(self, attr) < 0) {
 524                         perf_header_attr__delete(attr);
 525                         return -ENOMEM;
 526                 }
 527
 528                 lseek(fd, tmp, SEEK_SET);
 529         }
 530
 531         if (f_header.event_types.size) {
 532                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 533                 events = malloc(f_header.event_types.size);
 534                 if (events == NULL)
 535                         return -ENOMEM;
 536                 do_read(fd, events, f_header.event_types.size);
 537                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 538         }
 539
 540         perf_header__process_sections(self, fd, perf_file_section__process);
 541
 542         lseek(fd, self->data_offset, SEEK_SET);
 543
 544         self->frozen = 1;
 545         return 0;
 546 }
 547
 548 u64 perf_header__sample_type(struct perf_header *header)
 549 {
 550         u64 type = 0;
 551         int i;
 552
 553         for (i = 0; i < header->attrs; i++) {
 554                 struct perf_header_attr *attr = header->attr[i];
 555
 556                 if (!type)
 557                         type = attr->attr.sample_type;
 558                 else if (type != attr->attr.sample_type)
 559                         die("non matching sample_type");
 560         }
 561
 562         return type;
 563 }
 564
 565 struct perf_event_attr *
 566 perf_header__find_attr(u64 id, struct perf_header *header)
 567 {
 568         int i;
 569
 570         for (i = 0; i < header->attrs; i++) {
 571                 struct perf_header_attr *attr = header->attr[i];
 572                 int j;
 573
 574                 for (j = 0; j < attr->ids; j++) {
 575                         if (attr->id[j] == id)
 576                                 return &attr->attr;
 577                 }
 578         }
 579
 580         return NULL;
 581 }