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__add_id(struct perf_header_attr *self, u64 id)
  37 {
  38         int pos = self->ids;
  39
  40         self->ids++;
  41         if (self->ids > self->size) {
  42                 self->size *= 2;
  43                 self->id = realloc(self->id, self->size * sizeof(u64));
  44                 if (!self->id)
  45                         die("nomem");
  46         }
  47         self->id[pos] = id;
  48 }
  49
  50 /*
  51  * Create new perf.data header:
  52  */
  53 struct perf_header *perf_header__new(void)
  54 {
  55         struct perf_header *self = calloc(sizeof(*self), 1);
  56
  57         if (!self)
  58                 die("nomem");
  59
  60         self->size = 1;
  61         self->attr = malloc(sizeof(void *));
  62
  63         if (!self->attr)
  64                 die("nomem");
  65
  66         return self;
  67 }
  68
  69 void perf_header__add_attr(struct perf_header *self,
  70                            struct perf_header_attr *attr)
  71 {
  72         int pos = self->attrs;
  73
  74         if (self->frozen)
  75                 die("frozen");
  76
  77         self->attrs++;
  78         if (self->attrs > self->size) {
  79                 self->size *= 2;
  80                 self->attr = realloc(self->attr, self->size * sizeof(void *));
  81                 if (!self->attr)
  82                         die("nomem");
  83         }
  84         self->attr[pos] = attr;
  85 }
  86
  87 #define MAX_EVENT_NAME 64
  88
  89 struct perf_trace_event_type {
  90         u64     event_id;
  91         char    name[MAX_EVENT_NAME];
  92 };
  93
  94 static int event_count;
  95 static struct perf_trace_event_type *events;
  96
  97 void perf_header__push_event(u64 id, const char *name)
  98 {
  99         if (strlen(name) > MAX_EVENT_NAME)
 100                 pr_warning("Event %s will be truncated\n", name);
 101
 102         if (!events) {
 103                 events = malloc(sizeof(struct perf_trace_event_type));
 104                 if (!events)
 105                         die("nomem");
 106         } else {
 107                 events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
 108                 if (!events)
 109                         die("nomem");
 110         }
 111         memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
 112         events[event_count].event_id = id;
 113         strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
 114         event_count++;
 115 }
 116
 117 char *perf_header__find_event(u64 id)
 118 {
 119         int i;
 120         for (i = 0 ; i < event_count; i++) {
 121                 if (events[i].event_id == id)
 122                         return events[i].name;
 123         }
 124         return NULL;
 125 }
 126
 127 static const char *__perf_magic = "PERFFILE";
 128
 129 #define PERF_MAGIC      (*(u64 *)__perf_magic)
 130
 131 struct perf_file_attr {
 132         struct perf_event_attr  attr;
 133         struct perf_file_section        ids;
 134 };
 135
 136 void perf_header__set_feat(struct perf_header *self, int feat)
 137 {
 138         set_bit(feat, self->adds_features);
 139 }
 140
 141 bool perf_header__has_feat(const struct perf_header *self, int feat)
 142 {
 143         return test_bit(feat, self->adds_features);
 144 }
 145
 146 static void do_write(int fd, void *buf, size_t size)
 147 {
 148         while (size) {
 149                 int ret = write(fd, buf, size);
 150
 151                 if (ret < 0)
 152                         die("failed to write");
 153
 154                 size -= ret;
 155                 buf += ret;
 156         }
 157 }
 158
 159 static void write_buildid_table(int fd, struct list_head *id_head)
 160 {
 161         struct build_id_list *iter, *next;
 162
 163         list_for_each_entry_safe(iter, next, id_head, list) {
 164                 struct build_id_event *b = &iter->event;
 165
 166                 do_write(fd, b, sizeof(*b));
 167                 do_write(fd, (void *)iter->dso_name, iter->len);
 168                 list_del(&iter->list);
 169                 free(iter);
 170         }
 171 }
 172
 173 static void
 174 perf_header__adds_write(struct perf_header *self, int fd)
 175 {
 176         LIST_HEAD(id_list);
 177         int nr_sections;
 178         struct perf_file_section *feat_sec;
 179         int sec_size;
 180         u64 sec_start;
 181         int idx = 0;
 182
 183         if (fetch_build_id_table(&id_list))
 184                 perf_header__set_feat(self, HEADER_BUILD_ID);
 185
 186         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 187         if (!nr_sections)
 188                 return;
 189
 190         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 191         if (!feat_sec)
 192                 die("No memory");
 193
 194         sec_size = sizeof(*feat_sec) * nr_sections;
 195
 196         sec_start = self->data_offset + self->data_size;
 197         lseek(fd, sec_start + sec_size, SEEK_SET);
 198
 199         if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
 200                 struct perf_file_section *trace_sec;
 201
 202                 trace_sec = &feat_sec[idx++];
 203
 204                 /* Write trace info */
 205                 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
 206                 read_tracing_data(fd, attrs, nr_counters);
 207                 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
 208         }
 209
 210
 211         if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
 212                 struct perf_file_section *buildid_sec;
 213
 214                 buildid_sec = &feat_sec[idx++];
 215
 216                 /* Write build-ids */
 217                 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
 218                 write_buildid_table(fd, &id_list);
 219                 buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
 220         }
 221
 222         lseek(fd, sec_start, SEEK_SET);
 223         do_write(fd, feat_sec, sec_size);
 224         free(feat_sec);
 225 }
 226
 227 void perf_header__write(struct perf_header *self, int fd, bool at_exit)
 228 {
 229         struct perf_file_header f_header;
 230         struct perf_file_attr   f_attr;
 231         struct perf_header_attr *attr;
 232         int i;
 233
 234         lseek(fd, sizeof(f_header), SEEK_SET);
 235
 236
 237         for (i = 0; i < self->attrs; i++) {
 238                 attr = self->attr[i];
 239
 240                 attr->id_offset = lseek(fd, 0, SEEK_CUR);
 241                 do_write(fd, attr->id, attr->ids * sizeof(u64));
 242         }
 243
 244
 245         self->attr_offset = lseek(fd, 0, SEEK_CUR);
 246
 247         for (i = 0; i < self->attrs; i++) {
 248                 attr = self->attr[i];
 249
 250                 f_attr = (struct perf_file_attr){
 251                         .attr = attr->attr,
 252                         .ids  = {
 253                                 .offset = attr->id_offset,
 254                                 .size   = attr->ids * sizeof(u64),
 255                         }
 256                 };
 257                 do_write(fd, &f_attr, sizeof(f_attr));
 258         }
 259
 260         self->event_offset = lseek(fd, 0, SEEK_CUR);
 261         self->event_size = event_count * sizeof(struct perf_trace_event_type);
 262         if (events)
 263                 do_write(fd, events, self->event_size);
 264
 265         self->data_offset = lseek(fd, 0, SEEK_CUR);
 266
 267         if (at_exit)
 268                 perf_header__adds_write(self, fd);
 269
 270         f_header = (struct perf_file_header){
 271                 .magic     = PERF_MAGIC,
 272                 .size      = sizeof(f_header),
 273                 .attr_size = sizeof(f_attr),
 274                 .attrs = {
 275                         .offset = self->attr_offset,
 276                         .size   = self->attrs * sizeof(f_attr),
 277                 },
 278                 .data = {
 279                         .offset = self->data_offset,
 280                         .size   = self->data_size,
 281                 },
 282                 .event_types = {
 283                         .offset = self->event_offset,
 284                         .size   = self->event_size,
 285                 },
 286         };
 287
 288         memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 289
 290         lseek(fd, 0, SEEK_SET);
 291         do_write(fd, &f_header, sizeof(f_header));
 292         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 293
 294         self->frozen = 1;
 295 }
 296
 297 static void do_read(int fd, void *buf, size_t size)
 298 {
 299         while (size) {
 300                 int ret = read(fd, buf, size);
 301
 302                 if (ret < 0)
 303                         die("failed to read");
 304                 if (ret == 0)
 305                         die("failed to read: missing data");
 306
 307                 size -= ret;
 308                 buf += ret;
 309         }
 310 }
 311
 312 int perf_header__process_sections(struct perf_header *self, int fd,
 313                                   int (*process)(struct perf_file_section *self,
 314                                                  int feat, int fd))
 315 {
 316         struct perf_file_section *feat_sec;
 317         int nr_sections;
 318         int sec_size;
 319         int idx = 0;
 320         int err = 0, feat = 1;
 321
 322         nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
 323         if (!nr_sections)
 324                 return 0;
 325
 326         feat_sec = calloc(sizeof(*feat_sec), nr_sections);
 327         if (!feat_sec)
 328                 return -1;
 329
 330         sec_size = sizeof(*feat_sec) * nr_sections;
 331
 332         lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 333
 334         do_read(fd, feat_sec, sec_size);
 335
 336         while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
 337                 if (perf_header__has_feat(self, feat)) {
 338                         struct perf_file_section *sec = &feat_sec[idx++];
 339
 340                         err = process(sec, feat, fd);
 341                         if (err < 0)
 342                                 break;
 343                 }
 344                 ++feat;
 345         }
 346
 347         free(feat_sec);
 348         return err;
 349 };
 350
 351 int perf_file_header__read(struct perf_file_header *self,
 352                            struct perf_header *ph, int fd)
 353 {
 354         lseek(fd, 0, SEEK_SET);
 355         do_read(fd, self, sizeof(*self));
 356
 357         if (self->magic     != PERF_MAGIC ||
 358             self->attr_size != sizeof(struct perf_file_attr))
 359                 return -1;
 360
 361         if (self->size != sizeof(*self)) {
 362                 /* Support the previous format */
 363                 if (self->size == offsetof(typeof(*self), adds_features))
 364                         bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
 365                 else
 366                         return -1;
 367         }
 368
 369         memcpy(&ph->adds_features, &self->adds_features,
 370                sizeof(self->adds_features));
 371
 372         ph->event_offset = self->event_types.offset;
 373         ph->event_size   = self->event_types.size;
 374         ph->data_offset  = self->data.offset;
 375         ph->data_size    = self->data.size;
 376         return 0;
 377 }
 378
 379 static int perf_file_section__process(struct perf_file_section *self,
 380                                       int feat, int fd)
 381 {
 382         if (lseek(fd, self->offset, SEEK_SET) < 0) {
 383                 pr_debug("Failed to lseek to %Ld offset for feature %d, "
 384                          "continuing...\n", self->offset, feat);
 385                 return 0;
 386         }
 387
 388         switch (feat) {
 389         case HEADER_TRACE_INFO:
 390                 trace_report(fd);
 391                 break;
 392
 393         case HEADER_BUILD_ID:
 394                 if (perf_header__read_build_ids(fd, self->offset, self->size))
 395                         pr_debug("Failed to read buildids, continuing...\n");
 396                 break;
 397         default:
 398                 pr_debug("unknown feature %d, continuing...\n", feat);
 399         }
 400
 401         return 0;
 402 }
 403
 404 struct perf_header *perf_header__read(int fd)
 405 {
 406         struct perf_header      *self = perf_header__new();
 407         struct perf_file_header f_header;
 408         struct perf_file_attr   f_attr;
 409         u64                     f_id;
 410         int nr_attrs, nr_ids, i, j;
 411
 412         if (perf_file_header__read(&f_header, self, fd) < 0)
 413                 die("incompatible file format");
 414
 415         nr_attrs = f_header.attrs.size / sizeof(f_attr);
 416         lseek(fd, f_header.attrs.offset, SEEK_SET);
 417
 418         for (i = 0; i < nr_attrs; i++) {
 419                 struct perf_header_attr *attr;
 420                 off_t tmp;
 421
 422                 do_read(fd, &f_attr, sizeof(f_attr));
 423                 tmp = lseek(fd, 0, SEEK_CUR);
 424
 425                 attr = perf_header_attr__new(&f_attr.attr);
 426                 if (attr == NULL)
 427                          die("nomem");
 428
 429                 nr_ids = f_attr.ids.size / sizeof(u64);
 430                 lseek(fd, f_attr.ids.offset, SEEK_SET);
 431
 432                 for (j = 0; j < nr_ids; j++) {
 433                         do_read(fd, &f_id, sizeof(f_id));
 434
 435                         perf_header_attr__add_id(attr, f_id);
 436                 }
 437                 perf_header__add_attr(self, attr);
 438                 lseek(fd, tmp, SEEK_SET);
 439         }
 440
 441         if (f_header.event_types.size) {
 442                 lseek(fd, f_header.event_types.offset, SEEK_SET);
 443                 events = malloc(f_header.event_types.size);
 444                 if (!events)
 445                         die("nomem");
 446                 do_read(fd, events, f_header.event_types.size);
 447                 event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 448         }
 449
 450         perf_header__process_sections(self, fd, perf_file_section__process);
 451
 452         lseek(fd, self->data_offset, SEEK_SET);
 453
 454         self->frozen = 1;
 455
 456         return self;
 457 }
 458
 459 u64 perf_header__sample_type(struct perf_header *header)
 460 {
 461         u64 type = 0;
 462         int i;
 463
 464         for (i = 0; i < header->attrs; i++) {
 465                 struct perf_header_attr *attr = header->attr[i];
 466
 467                 if (!type)
 468                         type = attr->attr.sample_type;
 469                 else if (type != attr->attr.sample_type)
 470                         die("non matching sample_type");
 471         }
 472
 473         return type;
 474 }
 475
 476 struct perf_event_attr *
 477 perf_header__find_attr(u64 id, struct perf_header *header)
 478 {
 479         int i;
 480
 481         for (i = 0; i < header->attrs; i++) {
 482                 struct perf_header_attr *attr = header->attr[i];
 483                 int j;
 484
 485                 for (j = 0; j < attr->ids; j++) {
 486                         if (attr->id[j] == id)
 487                                 return &attr->attr;
 488                 }
 489         }
 490
 491         return NULL;
 492 }