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