drtracing.org Git - deliverable/linux.git/blob

1 #define _FILE_OFFSET_BITS 64

3 #include <sys/types.h>

4 #include <byteswap.h>

5 #include <unistd.h>

6 #include <stdio.h>

7 #include <stdlib.h>

8 #include <linux/list.h>

9 #include <linux/kernel.h>

11 #include "util.h"

12 #include "header.h"

13 #include "../perf.h"

14 #include "trace-event.h"

15 #include "session.h"

16 #include "symbol.h"

17 #include "debug.h"

19 /*

20 * Create new perf.data header attribute:

21 */

22 struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)

23 {

24 struct perf_header_attr *self = malloc(sizeof(*self));

26 if (self != NULL) {

27 self->attr = *attr;

28 self->ids = 0;

29 self->size = 1;

30 self->id = malloc(sizeof(u64));

31 if (self->id == NULL) {

32 free(self);

33 self = NULL;

34 }

35 }

37 return self;

38 }

40 void perf_header_attr__delete(struct perf_header_attr *self)

41 {

42 free(self->id);

43 free(self);

44 }

46 int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)

47 {

48 int pos = self->ids;

50 self->ids++;

51 if (self->ids > self->size) {

52 int nsize = self->size * 2;

53 u64 *nid = realloc(self->id, nsize * sizeof(u64));

55 if (nid == NULL)

56 return -1;

58 self->size = nsize;

59 self->id = nid;

60 }

61 self->id[pos] = id;

62 return 0;

63 }

65 int perf_header__init(struct perf_header *self)

66 {

67 self->size = 1;

68 self->attr = malloc(sizeof(void *));

69 return self->attr == NULL ? -ENOMEM : 0;

70 }

72 void perf_header__exit(struct perf_header *self)

73 {

74 int i;

75 for (i = 0; i < self->attrs; ++i)

76 perf_header_attr__delete(self->attr[i]);

77 free(self->attr);

78 }

80 int perf_header__add_attr(struct perf_header *self,

81 struct perf_header_attr *attr)

82 {

83 if (self->frozen)

84 return -1;

86 if (self->attrs == self->size) {

87 int nsize = self->size * 2;

88 struct perf_header_attr **nattr;

90 nattr = realloc(self->attr, nsize * sizeof(void *));

91 if (nattr == NULL)

92 return -1;

94 self->size = nsize;

95 self->attr = nattr;

96 }

98 self->attr[self->attrs++] = attr;

99 return 0;

100 }

101

102 static int event_count;

103 static struct perf_trace_event_type *events;

104

105 int perf_header__push_event(u64 id, const char *name)

106 {

107 if (strlen(name) > MAX_EVENT_NAME)

108 pr_warning("Event %s will be truncated\n", name);

109

110 if (!events) {

111 events = malloc(sizeof(struct perf_trace_event_type));

112 if (events == NULL)

113 return -ENOMEM;

114 } else {

115 struct perf_trace_event_type *nevents;

116

117 nevents = realloc(events, (event_count + 1) * sizeof(*events));

118 if (nevents == NULL)

119 return -ENOMEM;

120 events = nevents;

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 return 0;

127 }

128

129 char *perf_header__find_event(u64 id)

130 {

131 int i;

132 for (i = 0 ; i < event_count; i++) {

133 if (events[i].event_id == id)

134 return events[i].name;

135 }

136 return NULL;

137 }

138

139 static const char *__perf_magic = "PERFFILE";

140

141 #define PERF_MAGIC (*(u64 *)__perf_magic)

142

143 struct perf_file_attr {

144 struct perf_event_attr attr;

145 struct perf_file_section ids;

146 };

147

148 void perf_header__set_feat(struct perf_header *self, int feat)

149 {

150 set_bit(feat, self->adds_features);

151 }

152

153 bool perf_header__has_feat(const struct perf_header *self, int feat)

154 {

155 return test_bit(feat, self->adds_features);

156 }

157

158 static int do_write(int fd, const void *buf, size_t size)

159 {

160 while (size) {

161 int ret = write(fd, buf, size);

162

163 if (ret < 0)

164 return -errno;

165

166 size -= ret;

167 buf += ret;

168 }

169

170 return 0;

171 }

172

173 #define NAME_ALIGN 64

174

175 static int write_padded(int fd, const void *bf, size_t count,

176 size_t count_aligned)

177 {

178 static const char zero_buf[NAME_ALIGN];

179 int err = do_write(fd, bf, count);

180

181 if (!err)

182 err = do_write(fd, zero_buf, count_aligned - count);

183

184 return err;

185 }

186

187 #define dsos__for_each_with_build_id(pos, head) \

188 list_for_each_entry(pos, head, node) \

189 if (!pos->has_build_id) \

190 continue; \

191 else

192

193 static int __dsos__write_buildid_table(struct list_head *head, u16 misc, int fd)

194 {

195 struct dso *pos;

196

197 dsos__for_each_with_build_id(pos, head) {

198 int err;

199 struct build_id_event b;

200 size_t len;

201

202 if (!pos->hit)

203 continue;

204 len = pos->long_name_len + 1;

205 len = ALIGN(len, NAME_ALIGN);

206 memset(&b, 0, sizeof(b));

207 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));

208 b.header.misc = misc;

209 b.header.size = sizeof(b) + len;

210 err = do_write(fd, &b, sizeof(b));

211 if (err < 0)

212 return err;

213 err = write_padded(fd, pos->long_name,

214 pos->long_name_len + 1, len);

215 if (err < 0)

216 return err;

217 }

218

219 return 0;

220 }

221

222 static int dsos__write_buildid_table(int fd)

223 {

224 int err = __dsos__write_buildid_table(&dsos__kernel,

225 PERF_RECORD_MISC_KERNEL, fd);

226 if (err == 0)

227 err = __dsos__write_buildid_table(&dsos__user,

228 PERF_RECORD_MISC_USER, fd);

229 return err;

230 }

231

232 int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,

233 const char *name, bool is_kallsyms)

234 {

235 const size_t size = PATH_MAX;

236 char *filename = malloc(size),

237 *linkname = malloc(size), *targetname;

238 int len, err = -1;

239

240 if (filename == NULL || linkname == NULL)

241 goto out_free;

242

243 len = snprintf(filename, size, "%s%s%s",

244 debugdir, is_kallsyms ? "/" : "", name);

245 if (mkdir_p(filename, 0755))

246 goto out_free;

247

248 snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);

249

250 if (access(filename, F_OK)) {

251 if (is_kallsyms) {

252 if (copyfile("/proc/kallsyms", filename))

253 goto out_free;

254 } else if (link(name, filename) && copyfile(name, filename))

255 goto out_free;

256 }

257

258 len = snprintf(linkname, size, "%s/.build-id/%.2s",

259 debugdir, sbuild_id);

260

261 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))

262 goto out_free;

263

264 snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);

265 targetname = filename + strlen(debugdir) - 5;

266 memcpy(targetname, "../..", 5);

267

268 if (symlink(targetname, linkname) == 0)

269 err = 0;

270 out_free:

271 free(filename);

272 free(linkname);

273 return err;

274 }

275

276 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,

277 const char *name, const char *debugdir,

278 bool is_kallsyms)

279 {

280 char sbuild_id[BUILD_ID_SIZE * 2 + 1];

281

282 build_id__sprintf(build_id, build_id_size, sbuild_id);

283

284 return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);

285 }

286

287 int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)

288 {

289 const size_t size = PATH_MAX;

290 char *filename = malloc(size),

291 *linkname = malloc(size);

292 int err = -1;

293

294 if (filename == NULL || linkname == NULL)

295 goto out_free;

296

297 snprintf(linkname, size, "%s/.build-id/%.2s/%s",

298 debugdir, sbuild_id, sbuild_id + 2);

299

300 if (access(linkname, F_OK))

301 goto out_free;

302

303 if (readlink(linkname, filename, size) < 0)

304 goto out_free;

305

306 if (unlink(linkname))

307 goto out_free;

308

309 /*

310 * Since the link is relative, we must make it absolute:

311 */

312 snprintf(linkname, size, "%s/.build-id/%.2s/%s",

313 debugdir, sbuild_id, filename);

314

315 if (unlink(linkname))

316 goto out_free;

317

318 err = 0;

319 out_free:

320 free(filename);

321 free(linkname);

322 return err;

323 }

324

325 static int dso__cache_build_id(struct dso *self, const char *debugdir)

326 {

327 bool is_kallsyms = self->kernel && self->long_name[0] != '/';

328

329 return build_id_cache__add_b(self->build_id, sizeof(self->build_id),

330 self->long_name, debugdir, is_kallsyms);

331 }

332

333 static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)

334 {

335 struct dso *pos;

336 int err = 0;

337

338 dsos__for_each_with_build_id(pos, head)

339 if (dso__cache_build_id(pos, debugdir))

340 err = -1;

341

342 return err;

343 }

344

345 static int dsos__cache_build_ids(void)

346 {

347 int err_kernel, err_user;

348 char debugdir[PATH_MAX];

349

350 snprintf(debugdir, sizeof(debugdir), "%s/%s", getenv("HOME"),

351 DEBUG_CACHE_DIR);

352

353 if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)

354 return -1;

355

356 err_kernel = __dsos__cache_build_ids(&dsos__kernel, debugdir);

357 err_user = __dsos__cache_build_ids(&dsos__user, debugdir);

358 return err_kernel || err_user ? -1 : 0;

359 }

360

361 static int perf_header__adds_write(struct perf_header *self, int fd)

362 {

363 int nr_sections;

364 struct perf_file_section *feat_sec;

365 int sec_size;

366 u64 sec_start;

367 int idx = 0, err;

368

369 if (dsos__read_build_ids(true))

370 perf_header__set_feat(self, HEADER_BUILD_ID);

371

372 nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);

373 if (!nr_sections)

374 return 0;

375

376 feat_sec = calloc(sizeof(*feat_sec), nr_sections);

377 if (feat_sec == NULL)

378 return -ENOMEM;

379

380 sec_size = sizeof(*feat_sec) * nr_sections;

381

382 sec_start = self->data_offset + self->data_size;

383 lseek(fd, sec_start + sec_size, SEEK_SET);

384

385 if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {

386 struct perf_file_section *trace_sec;

387

388 trace_sec = &feat_sec[idx++];

389

390 /* Write trace info */

391 trace_sec->offset = lseek(fd, 0, SEEK_CUR);

392 read_tracing_data(fd, attrs, nr_counters);

393 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;

394 }

395

396

397 if (perf_header__has_feat(self, HEADER_BUILD_ID)) {

398 struct perf_file_section *buildid_sec;

399

400 buildid_sec = &feat_sec[idx++];

401

402 /* Write build-ids */

403 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);

404 err = dsos__write_buildid_table(fd);

405 if (err < 0) {

406 pr_debug("failed to write buildid table\n");

407 goto out_free;

408 }

409 buildid_sec->size = lseek(fd, 0, SEEK_CUR) -

410 buildid_sec->offset;

411 dsos__cache_build_ids();

412 }

413

414 lseek(fd, sec_start, SEEK_SET);

415 err = do_write(fd, feat_sec, sec_size);

416 if (err < 0)

417 pr_debug("failed to write feature section\n");

418 out_free:

419 free(feat_sec);

420 return err;

421 }

422

423 int perf_header__write_pipe(int fd)

424 {

425 struct perf_pipe_file_header f_header;

426 int err;

427

428 f_header = (struct perf_pipe_file_header){

429 .magic = PERF_MAGIC,

430 .size = sizeof(f_header),

431 };

432

433 err = do_write(fd, &f_header, sizeof(f_header));

434 if (err < 0) {

435 pr_debug("failed to write perf pipe header\n");

436 return err;

437 }

438

439 return 0;

440 }

441

442 int perf_header__write(struct perf_header *self, int fd, bool at_exit)

443 {

444 struct perf_file_header f_header;

445 struct perf_file_attr f_attr;

446 struct perf_header_attr *attr;

447 int i, err;

448

449 lseek(fd, sizeof(f_header), SEEK_SET);

450

451

452 for (i = 0; i < self->attrs; i++) {

453 attr = self->attr[i];

454

455 attr->id_offset = lseek(fd, 0, SEEK_CUR);

456 err = do_write(fd, attr->id, attr->ids * sizeof(u64));

457 if (err < 0) {

458 pr_debug("failed to write perf header\n");

459 return err;

460 }

461 }

462

463

464 self->attr_offset = lseek(fd, 0, SEEK_CUR);

465

466 for (i = 0; i < self->attrs; i++) {

467 attr = self->attr[i];

468

469 f_attr = (struct perf_file_attr){

470 .attr = attr->attr,

471 .ids = {

472 .offset = attr->id_offset,

473 .size = attr->ids * sizeof(u64),

474 }

475 };

476 err = do_write(fd, &f_attr, sizeof(f_attr));

477 if (err < 0) {

478 pr_debug("failed to write perf header attribute\n");

479 return err;

480 }

481 }

482

483 self->event_offset = lseek(fd, 0, SEEK_CUR);

484 self->event_size = event_count * sizeof(struct perf_trace_event_type);

485 if (events) {

486 err = do_write(fd, events, self->event_size);

487 if (err < 0) {

488 pr_debug("failed to write perf header events\n");

489 return err;

490 }

491 }

492

493 self->data_offset = lseek(fd, 0, SEEK_CUR);

494

495 if (at_exit) {

496 err = perf_header__adds_write(self, fd);

497 if (err < 0)

498 return err;

499 }

500

501 f_header = (struct perf_file_header){

502 .magic = PERF_MAGIC,

503 .size = sizeof(f_header),

504 .attr_size = sizeof(f_attr),

505 .attrs = {

506 .offset = self->attr_offset,

507 .size = self->attrs * sizeof(f_attr),

508 },

509 .data = {

510 .offset = self->data_offset,

511 .size = self->data_size,

512 },

513 .event_types = {

514 .offset = self->event_offset,

515 .size = self->event_size,

516 },

517 };

518

519 memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));

520

521 lseek(fd, 0, SEEK_SET);

522 err = do_write(fd, &f_header, sizeof(f_header));

523 if (err < 0) {

524 pr_debug("failed to write perf header\n");

525 return err;

526 }

527 lseek(fd, self->data_offset + self->data_size, SEEK_SET);

528

529 self->frozen = 1;

530 return 0;

531 }

532

533 static int perf_header__getbuffer64(struct perf_header *self,

534 int fd, void *buf, size_t size)

535 {

536 if (do_read(fd, buf, size) <= 0)

537 return -1;

538

539 if (self->needs_swap)

540 mem_bswap_64(buf, size);

541

542 return 0;

543 }

544

545 int perf_header__process_sections(struct perf_header *self, int fd,

546 int (*process)(struct perf_file_section *self,

547 struct perf_header *ph,

548 int feat, int fd))

549 {

550 struct perf_file_section *feat_sec;

551 int nr_sections;

552 int sec_size;

553 int idx = 0;

554 int err = -1, feat = 1;

555

556 nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);

557 if (!nr_sections)

558 return 0;

559

560 feat_sec = calloc(sizeof(*feat_sec), nr_sections);

561 if (!feat_sec)

562 return -1;

563

564 sec_size = sizeof(*feat_sec) * nr_sections;

565

566 lseek(fd, self->data_offset + self->data_size, SEEK_SET);

567

568 if (perf_header__getbuffer64(self, fd, feat_sec, sec_size))

569 goto out_free;

570

571 err = 0;

572 while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {

573 if (perf_header__has_feat(self, feat)) {

574 struct perf_file_section *sec = &feat_sec[idx++];

575

576 err = process(sec, self, feat, fd);

577 if (err < 0)

578 break;

579 }

580 ++feat;

581 }

582 out_free:

583 free(feat_sec);

584 return err;

585 }

586

587 int perf_file_header__read(struct perf_file_header *self,

588 struct perf_header *ph, int fd)

589 {

590 lseek(fd, 0, SEEK_SET);

591

592 if (do_read(fd, self, sizeof(*self)) <= 0 ||

593 memcmp(&self->magic, __perf_magic, sizeof(self->magic)))

594 return -1;

595

596 if (self->attr_size != sizeof(struct perf_file_attr)) {

597 u64 attr_size = bswap_64(self->attr_size);

598

599 if (attr_size != sizeof(struct perf_file_attr))

600 return -1;

601

602 mem_bswap_64(self, offsetof(struct perf_file_header,

603 adds_features));

604 ph->needs_swap = true;

605 }

606

607 if (self->size != sizeof(*self)) {

608 /* Support the previous format */

609 if (self->size == offsetof(typeof(*self), adds_features))

610 bitmap_zero(self->adds_features, HEADER_FEAT_BITS);

611 else

612 return -1;

613 }

614

615 memcpy(&ph->adds_features, &self->adds_features,

616 sizeof(ph->adds_features));

617 /*

618 * FIXME: hack that assumes that if we need swap the perf.data file

619 * may be coming from an arch with a different word-size, ergo different

620 * DEFINE_BITMAP format, investigate more later, but for now its mostly

621 * safe to assume that we have a build-id section. Trace files probably

622 * have several other issues in this realm anyway...

623 */

624 if (ph->needs_swap) {

625 memset(&ph->adds_features, 0, sizeof(ph->adds_features));

626 perf_header__set_feat(ph, HEADER_BUILD_ID);

627 }

628

629 ph->event_offset = self->event_types.offset;

630 ph->event_size = self->event_types.size;

631 ph->data_offset = self->data.offset;

632 ph->data_size = self->data.size;

633 return 0;

634 }

635

636 static int perf_file_section__process(struct perf_file_section *self,

637 struct perf_header *ph,

638 int feat, int fd)

639 {

640 if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {

641 pr_debug("Failed to lseek to %Ld offset for feature %d, "

642 "continuing...\n", self->offset, feat);

643 return 0;

644 }

645

646 switch (feat) {

647 case HEADER_TRACE_INFO:

648 trace_report(fd);

649 break;

650

651 case HEADER_BUILD_ID:

652 if (perf_header__read_build_ids(ph, fd, self->offset, self->size))

653 pr_debug("Failed to read buildids, continuing...\n");

654 break;

655 default:

656 pr_debug("unknown feature %d, continuing...\n", feat);

657 }

658

659 return 0;

660 }

661

662 static int perf_file_header__read_pipe(struct perf_pipe_file_header *self,

663 struct perf_header *ph, int fd)

664 {

665 if (do_read(fd, self, sizeof(*self)) <= 0 ||

666 memcmp(&self->magic, __perf_magic, sizeof(self->magic)))

667 return -1;

668

669 if (self->size != sizeof(*self)) {

670 u64 size = bswap_64(self->size);

671

672 if (size != sizeof(*self))

673 return -1;

674

675 ph->needs_swap = true;

676 }

677

678 return 0;

679 }

680

681 static int perf_header__read_pipe(struct perf_session *session, int fd)

682 {

683 struct perf_header *self = &session->header;

684 struct perf_pipe_file_header f_header;

685

686 if (perf_file_header__read_pipe(&f_header, self, fd) < 0) {

687 pr_debug("incompatible file format\n");

688 return -EINVAL;

689 }

690

691 session->fd = fd;

692

693 return 0;

694 }

695

696 int perf_header__read(struct perf_session *session, int fd)

697 {

698 struct perf_header *self = &session->header;

699 struct perf_file_header f_header;

700 struct perf_file_attr f_attr;

701 u64 f_id;

702 int nr_attrs, nr_ids, i, j;

703

704 if (session->fd_pipe)

705 return perf_header__read_pipe(session, fd);

706

707 if (perf_file_header__read(&f_header, self, fd) < 0) {

708 pr_debug("incompatible file format\n");

709 return -EINVAL;

710 }

711

712 nr_attrs = f_header.attrs.size / sizeof(f_attr);

713 lseek(fd, f_header.attrs.offset, SEEK_SET);

714

715 for (i = 0; i < nr_attrs; i++) {

716 struct perf_header_attr *attr;

717 off_t tmp;

718

719 if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr)))

720 goto out_errno;

721

722 tmp = lseek(fd, 0, SEEK_CUR);

723

724 attr = perf_header_attr__new(&f_attr.attr);

725 if (attr == NULL)

726 return -ENOMEM;

727

728 nr_ids = f_attr.ids.size / sizeof(u64);

729 lseek(fd, f_attr.ids.offset, SEEK_SET);

730

731 for (j = 0; j < nr_ids; j++) {

732 if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id)))

733 goto out_errno;

734

735 if (perf_header_attr__add_id(attr, f_id) < 0) {

736 perf_header_attr__delete(attr);

737 return -ENOMEM;

738 }

739 }

740 if (perf_header__add_attr(self, attr) < 0) {

741 perf_header_attr__delete(attr);

742 return -ENOMEM;

743 }

744

745 lseek(fd, tmp, SEEK_SET);

746 }

747

748 if (f_header.event_types.size) {

749 lseek(fd, f_header.event_types.offset, SEEK_SET);

750 events = malloc(f_header.event_types.size);

751 if (events == NULL)

752 return -ENOMEM;

753 if (perf_header__getbuffer64(self, fd, events,

754 f_header.event_types.size))

755 goto out_errno;

756 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);

757 }

758

759 perf_header__process_sections(self, fd, perf_file_section__process);

760

761 lseek(fd, self->data_offset, SEEK_SET);

762

763 self->frozen = 1;

764 return 0;

765 out_errno:

766 return -errno;

767 }

768

769 u64 perf_header__sample_type(struct perf_header *header)

770 {

771 u64 type = 0;

772 int i;

773

774 for (i = 0; i < header->attrs; i++) {

775 struct perf_header_attr *attr = header->attr[i];

776

777 if (!type)

778 type = attr->attr.sample_type;

779 else if (type != attr->attr.sample_type)

780 die("non matching sample_type");

781 }

782

783 return type;

784 }

785

786 struct perf_event_attr *

787 perf_header__find_attr(u64 id, struct perf_header *header)

788 {

789 int i;

790

791 for (i = 0; i < header->attrs; i++) {

792 struct perf_header_attr *attr = header->attr[i];

793 int j;

794

795 for (j = 0; j < attr->ids; j++) {

796 if (attr->id[j] == id)

797 return &attr->attr;

798 }

799 }

800

801 return NULL;

802 }

803

804 int event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,

805 event__handler_t process,

806 struct perf_session *session)

807 {

808 event_t *ev;

809 size_t size;

810 int err;

811

812 size = sizeof(struct perf_event_attr);

813 size = ALIGN(size, sizeof(u64));

814 size += sizeof(struct perf_event_header);

815 size += ids * sizeof(u64);

816

817 ev = malloc(size);

818

819 ev->attr.attr = *attr;

820 memcpy(ev->attr.id, id, ids * sizeof(u64));

821

822 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;

823 ev->attr.header.size = size;

824

825 err = process(ev, session);

826

827 free(ev);

828

829 return err;

830 }

831

832 int event__synthesize_attrs(struct perf_header *self,

833 event__handler_t process,

834 struct perf_session *session)

835 {

836 struct perf_header_attr *attr;

837 int i, err = 0;

838

839 for (i = 0; i < self->attrs; i++) {

840 attr = self->attr[i];

841

842 err = event__synthesize_attr(&attr->attr, attr->ids, attr->id,

843 process, session);

844 if (err) {

845 pr_debug("failed to create perf header attribute\n");

846 return err;

847 }

848 }

849

850 return err;

851 }

852

853 int event__process_attr(event_t *self, struct perf_session *session)

854 {

855 struct perf_header_attr *attr;

856 unsigned int i, ids, n_ids;

857

858 attr = perf_header_attr__new(&self->attr.attr);

859 if (attr == NULL)

860 return -ENOMEM;

861

862 ids = self->header.size;

863 ids -= (void *)&self->attr.id - (void *)self;

864 n_ids = ids / sizeof(u64);

865

866 for (i = 0; i < n_ids; i++) {

867 if (perf_header_attr__add_id(attr, self->attr.id[i]) < 0) {

868 perf_header_attr__delete(attr);

869 return -ENOMEM;

870 }

871 }

872

873 if (perf_header__add_attr(&session->header, attr) < 0) {

874 perf_header_attr__delete(attr);

875 return -ENOMEM;

876 }

877

878 perf_session__update_sample_type(session);

879

880 return 0;

881 }

882

883 int event__synthesize_event_type(u64 event_id, char *name,

884 event__handler_t process,

885 struct perf_session *session)

886 {

887 event_t ev;

888 size_t size = 0;

889 int err = 0;

890

891 memset(&ev, 0, sizeof(ev));

892

893 ev.event_type.event_type.event_id = event_id;

894 memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);

895 strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);

896

897 ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;

898 size = strlen(name);

899 size = ALIGN(size, sizeof(u64));

900 ev.event_type.header.size = sizeof(ev.event_type) -

901 (sizeof(ev.event_type.event_type.name) - size);

902

903 err = process(&ev, session);

904

905 return err;

906 }

907

908 int event__synthesize_event_types(event__handler_t process,

909 struct perf_session *session)

910 {

911 struct perf_trace_event_type *type;

912 int i, err = 0;

913

914 for (i = 0; i < event_count; i++) {

915 type = &events[i];

916

917 err = event__synthesize_event_type(type->event_id, type->name,

918 process, session);

919 if (err) {

920 pr_debug("failed to create perf header event type\n");

921 return err;

922 }

923 }

924

925 return err;

926 }

927

928 int event__process_event_type(event_t *self,

929 struct perf_session *session __unused)

930 {

931 if (perf_header__push_event(self->event_type.event_type.event_id,

932 self->event_type.event_type.name) < 0)

933 return -ENOMEM;

934

935 return 0;

936 }