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