1// SPDX-License-Identifier: GPL-2.0
   2#include <errno.h>
   3#include <inttypes.h>
   4#include "util.h"
   5#include "string2.h"
   6#include <sys/param.h>
   7#include <sys/types.h>
   8#include <byteswap.h>
   9#include <unistd.h>
  10#include <stdio.h>
  11#include <stdlib.h>
  12#include <linux/compiler.h>
  13#include <linux/list.h>
  14#include <linux/kernel.h>
  15#include <linux/bitops.h>
  16#include <linux/stringify.h>
  17#include <sys/stat.h>
  18#include <sys/utsname.h>
  19#include <linux/time64.h>
  20#include <dirent.h>
  21
  22#include "evlist.h"
  23#include "evsel.h"
  24#include "header.h"
  25#include "memswap.h"
  26#include "../perf.h"
  27#include "trace-event.h"
  28#include "session.h"
  29#include "symbol.h"
  30#include "debug.h"
  31#include "cpumap.h"
  32#include "pmu.h"
  33#include "vdso.h"
  34#include "strbuf.h"
  35#include "build-id.h"
  36#include "data.h"
  37#include <api/fs/fs.h>
  38#include "asm/bug.h"
  39#include "tool.h"
  40#include "time-utils.h"
  41#include "units.h"
  42
  43#include "sane_ctype.h"
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  44
  45/*
  46 * magic2 = "PERFILE2"
  47 * must be a numerical value to let the endianness
  48 * determine the memory layout. That way we are able
  49 * to detect endianness when reading the perf.data file
  50 * back.
  51 *
  52 * we check for legacy (PERFFILE) format.
  53 */
  54static const char *__perf_magic1 = "PERFFILE";
  55static const u64 __perf_magic2    = 0x32454c4946524550ULL;
  56static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
  57
  58#define PERF_MAGIC	__perf_magic2
  59
  60const char perf_version_string[] = PERF_VERSION;
  61
  62struct perf_file_attr {
  63	struct perf_event_attr	attr;
  64	struct perf_file_section	ids;
  65};
  66
  67struct feat_fd {
  68	struct perf_header	*ph;
  69	int			fd;
  70	void			*buf;	/* Either buf != NULL or fd >= 0 */
  71	ssize_t			offset;
  72	size_t			size;
  73	struct perf_evsel	*events;
  74};
  75
  76void perf_header__set_feat(struct perf_header *header, int feat)
  77{
  78	set_bit(feat, header->adds_features);
  79}
  80
  81void perf_header__clear_feat(struct perf_header *header, int feat)
  82{
  83	clear_bit(feat, header->adds_features);
  84}
  85
  86bool perf_header__has_feat(const struct perf_header *header, int feat)
  87{
  88	return test_bit(feat, header->adds_features);
  89}
  90
  91static int __do_write_fd(struct feat_fd *ff, const void *buf, size_t size)
  92{
  93	ssize_t ret = writen(ff->fd, buf, size);
  94
  95	if (ret != (ssize_t)size)
  96		return ret < 0 ? (int)ret : -1;
  97	return 0;
  98}
  99
 100static int __do_write_buf(struct feat_fd *ff,  const void *buf, size_t size)
 101{
 102	/* struct perf_event_header::size is u16 */
 103	const size_t max_size = 0xffff - sizeof(struct perf_event_header);
 104	size_t new_size = ff->size;
 105	void *addr;
 106
 107	if (size + ff->offset > max_size)
 108		return -E2BIG;
 109
 110	while (size > (new_size - ff->offset))
 111		new_size <<= 1;
 112	new_size = min(max_size, new_size);
 113
 114	if (ff->size < new_size) {
 115		addr = realloc(ff->buf, new_size);
 116		if (!addr)
 117			return -ENOMEM;
 118		ff->buf = addr;
 119		ff->size = new_size;
 120	}
 121
 122	memcpy(ff->buf + ff->offset, buf, size);
 123	ff->offset += size;
 124
 125	return 0;
 126}
 127
 128/* Return: 0 if succeded, -ERR if failed. */
 129int do_write(struct feat_fd *ff, const void *buf, size_t size)
 130{
 131	if (!ff->buf)
 132		return __do_write_fd(ff, buf, size);
 133	return __do_write_buf(ff, buf, size);
 134}
 135
 136/* Return: 0 if succeded, -ERR if failed. */
 137static int do_write_bitmap(struct feat_fd *ff, unsigned long *set, u64 size)
 138{
 139	u64 *p = (u64 *) set;
 140	int i, ret;
 141
 142	ret = do_write(ff, &size, sizeof(size));
 143	if (ret < 0)
 144		return ret;
 145
 146	for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
 147		ret = do_write(ff, p + i, sizeof(*p));
 148		if (ret < 0)
 149			return ret;
 150	}
 151
 152	return 0;
 153}
 154
 155/* Return: 0 if succeded, -ERR if failed. */
 156int write_padded(struct feat_fd *ff, const void *bf,
 157		 size_t count, size_t count_aligned)
 158{
 159	static const char zero_buf[NAME_ALIGN];
 160	int err = do_write(ff, bf, count);
 161
 162	if (!err)
 163		err = do_write(ff, zero_buf, count_aligned - count);
 164
 165	return err;
 166}
 167
 168#define string_size(str)						\
 169	(PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
 170
 171/* Return: 0 if succeded, -ERR if failed. */
 172static int do_write_string(struct feat_fd *ff, const char *str)
 173{
 174	u32 len, olen;
 175	int ret;
 176
 177	olen = strlen(str) + 1;
 178	len = PERF_ALIGN(olen, NAME_ALIGN);
 179
 180	/* write len, incl. \0 */
 181	ret = do_write(ff, &len, sizeof(len));
 182	if (ret < 0)
 183		return ret;
 184
 185	return write_padded(ff, str, olen, len);
 186}
 187
 188static int __do_read_fd(struct feat_fd *ff, void *addr, ssize_t size)
 189{
 190	ssize_t ret = readn(ff->fd, addr, size);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 191
 192	if (ret != size)
 193		return ret < 0 ? (int)ret : -1;
 194	return 0;
 195}
 196
 197static int __do_read_buf(struct feat_fd *ff, void *addr, ssize_t size)
 
 
 
 
 
 
 
 198{
 199	if (size > (ssize_t)ff->size - ff->offset)
 200		return -1;
 
 
 
 
 201
 202	memcpy(addr, ff->buf + ff->offset, size);
 203	ff->offset += size;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 204
 205	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 206
 
 
 
 
 
 
 207}
 208
 209static int __do_read(struct feat_fd *ff, void *addr, ssize_t size)
 210{
 211	if (!ff->buf)
 212		return __do_read_fd(ff, addr, size);
 213	return __do_read_buf(ff, addr, size);
 
 
 
 
 
 
 
 
 
 
 
 
 214}
 215
 216static int do_read_u32(struct feat_fd *ff, u32 *addr)
 
 217{
 218	int ret;
 
 
 
 
 
 
 
 
 
 
 
 
 219
 220	ret = __do_read(ff, addr, sizeof(*addr));
 221	if (ret)
 222		return ret;
 223
 224	if (ff->ph->needs_swap)
 225		*addr = bswap_32(*addr);
 226	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 227}
 228
 229static int do_read_u64(struct feat_fd *ff, u64 *addr)
 
 
 230{
 231	int ret;
 232
 233	ret = __do_read(ff, addr, sizeof(*addr));
 234	if (ret)
 235		return ret;
 236
 237	if (ff->ph->needs_swap)
 238		*addr = bswap_64(*addr);
 239	return 0;
 240}
 241
 242static char *do_read_string(struct feat_fd *ff)
 243{
 244	u32 len;
 245	char *buf;
 
 
 246
 247	if (do_read_u32(ff, &len))
 248		return NULL;
 249
 250	buf = malloc(len);
 251	if (!buf)
 252		return NULL;
 253
 254	if (!__do_read(ff, buf, len)) {
 255		/*
 256		 * strings are padded by zeroes
 257		 * thus the actual strlen of buf
 258		 * may be less than len
 259		 */
 260		return buf;
 261	}
 262
 263	free(buf);
 264	return NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 265}
 266
 267/* Return: 0 if succeded, -ERR if failed. */
 268static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
 269{
 270	unsigned long *set;
 271	u64 size, *p;
 272	int i, ret;
 273
 274	ret = do_read_u64(ff, &size);
 275	if (ret)
 276		return ret;
 277
 278	set = bitmap_alloc(size);
 279	if (!set)
 280		return -ENOMEM;
 
 
 
 
 
 281
 282	bitmap_zero(set, size);
 
 283
 284	p = (u64 *) set;
 
 
 
 
 
 285
 286	for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
 287		ret = do_read_u64(ff, p + i);
 288		if (ret < 0) {
 289			free(set);
 290			return ret;
 291		}
 
 
 
 
 
 
 
 
 
 
 292	}
 
 
 293
 294	*pset  = set;
 295	*psize = size;
 296	return 0;
 
 
 297}
 298
 299static int write_tracing_data(struct feat_fd *ff,
 300			      struct perf_evlist *evlist)
 301{
 302	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
 303		return -1;
 
 
 
 
 
 304
 305	return read_tracing_data(ff->fd, &evlist->entries);
 306}
 307
 308static int write_build_id(struct feat_fd *ff,
 309			  struct perf_evlist *evlist __maybe_unused)
 
 
 
 
 
 
 
 310{
 311	struct perf_session *session;
 312	int err;
 313
 314	session = container_of(ff->ph, struct perf_session, header);
 315
 316	if (!perf_session__read_build_ids(session, true))
 317		return -1;
 318
 319	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
 320		return -1;
 321
 322	err = perf_session__write_buildid_table(session, ff);
 323	if (err < 0) {
 324		pr_debug("failed to write buildid table\n");
 325		return err;
 326	}
 327	perf_session__cache_build_ids(session);
 
 328
 329	return 0;
 330}
 331
 332static int write_hostname(struct feat_fd *ff,
 333			  struct perf_evlist *evlist __maybe_unused)
 334{
 335	struct utsname uts;
 336	int ret;
 337
 338	ret = uname(&uts);
 339	if (ret < 0)
 340		return -1;
 341
 342	return do_write_string(ff, uts.nodename);
 343}
 344
 345static int write_osrelease(struct feat_fd *ff,
 346			   struct perf_evlist *evlist __maybe_unused)
 347{
 348	struct utsname uts;
 349	int ret;
 350
 351	ret = uname(&uts);
 352	if (ret < 0)
 353		return -1;
 354
 355	return do_write_string(ff, uts.release);
 356}
 357
 358static int write_arch(struct feat_fd *ff,
 359		      struct perf_evlist *evlist __maybe_unused)
 360{
 361	struct utsname uts;
 362	int ret;
 363
 364	ret = uname(&uts);
 365	if (ret < 0)
 366		return -1;
 367
 368	return do_write_string(ff, uts.machine);
 369}
 370
 371static int write_version(struct feat_fd *ff,
 372			 struct perf_evlist *evlist __maybe_unused)
 373{
 374	return do_write_string(ff, perf_version_string);
 375}
 376
 377static int __write_cpudesc(struct feat_fd *ff, const char *cpuinfo_proc)
 
 378{
 
 
 
 379	FILE *file;
 380	char *buf = NULL;
 381	char *s, *p;
 382	const char *search = cpuinfo_proc;
 383	size_t len = 0;
 384	int ret = -1;
 385
 386	if (!search)
 387		return -1;
 388
 389	file = fopen("/proc/cpuinfo", "r");
 390	if (!file)
 391		return -1;
 392
 393	while (getline(&buf, &len, file) > 0) {
 394		ret = strncmp(buf, search, strlen(search));
 395		if (!ret)
 396			break;
 397	}
 398
 399	if (ret) {
 400		ret = -1;
 401		goto done;
 402	}
 403
 404	s = buf;
 405
 406	p = strchr(buf, ':');
 407	if (p && *(p+1) == ' ' && *(p+2))
 408		s = p + 2;
 409	p = strchr(s, '\n');
 410	if (p)
 411		*p = '\0';
 412
 413	/* squash extra space characters (branding string) */
 414	p = s;
 415	while (*p) {
 416		if (isspace(*p)) {
 417			char *r = p + 1;
 418			char *q = r;
 419			*p = ' ';
 420			while (*q && isspace(*q))
 421				q++;
 422			if (q != (p+1))
 423				while ((*r++ = *q++));
 424		}
 425		p++;
 426	}
 427	ret = do_write_string(ff, s);
 428done:
 429	free(buf);
 430	fclose(file);
 431	return ret;
 432}
 433
 434static int write_cpudesc(struct feat_fd *ff,
 435		       struct perf_evlist *evlist __maybe_unused)
 436{
 437	const char *cpuinfo_procs[] = CPUINFO_PROC;
 438	unsigned int i;
 439
 440	for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
 441		int ret;
 442		ret = __write_cpudesc(ff, cpuinfo_procs[i]);
 443		if (ret >= 0)
 444			return ret;
 445	}
 446	return -1;
 447}
 448
 449
 450static int write_nrcpus(struct feat_fd *ff,
 451			struct perf_evlist *evlist __maybe_unused)
 452{
 453	long nr;
 454	u32 nrc, nra;
 455	int ret;
 456
 457	nrc = cpu__max_present_cpu();
 
 
 
 
 458
 459	nr = sysconf(_SC_NPROCESSORS_ONLN);
 460	if (nr < 0)
 461		return -1;
 462
 463	nra = (u32)(nr & UINT_MAX);
 464
 465	ret = do_write(ff, &nrc, sizeof(nrc));
 466	if (ret < 0)
 467		return ret;
 468
 469	return do_write(ff, &nra, sizeof(nra));
 470}
 471
 472static int write_event_desc(struct feat_fd *ff,
 473			    struct perf_evlist *evlist)
 474{
 475	struct perf_evsel *evsel;
 476	u32 nre, nri, sz;
 477	int ret;
 478
 479	nre = evlist->nr_entries;
 
 480
 481	/*
 482	 * write number of events
 483	 */
 484	ret = do_write(ff, &nre, sizeof(nre));
 485	if (ret < 0)
 486		return ret;
 487
 488	/*
 489	 * size of perf_event_attr struct
 490	 */
 491	sz = (u32)sizeof(evsel->attr);
 492	ret = do_write(ff, &sz, sizeof(sz));
 493	if (ret < 0)
 494		return ret;
 495
 496	evlist__for_each_entry(evlist, evsel) {
 497		ret = do_write(ff, &evsel->attr, sz);
 
 498		if (ret < 0)
 499			return ret;
 500		/*
 501		 * write number of unique id per event
 502		 * there is one id per instance of an event
 503		 *
 504		 * copy into an nri to be independent of the
 505		 * type of ids,
 506		 */
 507		nri = evsel->ids;
 508		ret = do_write(ff, &nri, sizeof(nri));
 509		if (ret < 0)
 510			return ret;
 511
 512		/*
 513		 * write event string as passed on cmdline
 514		 */
 515		ret = do_write_string(ff, perf_evsel__name(evsel));
 516		if (ret < 0)
 517			return ret;
 518		/*
 519		 * write unique ids for this event
 520		 */
 521		ret = do_write(ff, evsel->id, evsel->ids * sizeof(u64));
 522		if (ret < 0)
 523			return ret;
 524	}
 525	return 0;
 526}
 527
 528static int write_cmdline(struct feat_fd *ff,
 529			 struct perf_evlist *evlist __maybe_unused)
 530{
 531	char buf[MAXPATHLEN];
 532	u32 n;
 533	int i, ret;
 
 534
 535	/* actual path to perf binary */
 536	ret = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
 
 
 
 537	if (ret <= 0)
 538		return -1;
 539
 540	/* readlink() does not add null termination */
 541	buf[ret] = '\0';
 542
 543	/* account for binary path */
 544	n = perf_env.nr_cmdline + 1;
 545
 546	ret = do_write(ff, &n, sizeof(n));
 547	if (ret < 0)
 548		return ret;
 549
 550	ret = do_write_string(ff, buf);
 551	if (ret < 0)
 552		return ret;
 553
 554	for (i = 0 ; i < perf_env.nr_cmdline; i++) {
 555		ret = do_write_string(ff, perf_env.cmdline_argv[i]);
 556		if (ret < 0)
 557			return ret;
 558	}
 559	return 0;
 560}
 561
 562#define CORE_SIB_FMT \
 563	"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
 564#define THRD_SIB_FMT \
 565	"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
 566
 567struct cpu_topo {
 568	u32 cpu_nr;
 569	u32 core_sib;
 570	u32 thread_sib;
 571	char **core_siblings;
 572	char **thread_siblings;
 573};
 574
 575static int build_cpu_topo(struct cpu_topo *tp, int cpu)
 576{
 577	FILE *fp;
 578	char filename[MAXPATHLEN];
 579	char *buf = NULL, *p;
 580	size_t len = 0;
 581	ssize_t sret;
 582	u32 i = 0;
 583	int ret = -1;
 584
 585	sprintf(filename, CORE_SIB_FMT, cpu);
 586	fp = fopen(filename, "r");
 587	if (!fp)
 588		goto try_threads;
 
 
 
 589
 590	sret = getline(&buf, &len, fp);
 591	fclose(fp);
 592	if (sret <= 0)
 593		goto try_threads;
 594
 595	p = strchr(buf, '\n');
 596	if (p)
 597		*p = '\0';
 598
 599	for (i = 0; i < tp->core_sib; i++) {
 600		if (!strcmp(buf, tp->core_siblings[i]))
 601			break;
 602	}
 603	if (i == tp->core_sib) {
 604		tp->core_siblings[i] = buf;
 605		tp->core_sib++;
 606		buf = NULL;
 607		len = 0;
 608	}
 609	ret = 0;
 610
 611try_threads:
 612	sprintf(filename, THRD_SIB_FMT, cpu);
 613	fp = fopen(filename, "r");
 614	if (!fp)
 615		goto done;
 616
 617	if (getline(&buf, &len, fp) <= 0)
 618		goto done;
 619
 620	p = strchr(buf, '\n');
 621	if (p)
 622		*p = '\0';
 623
 624	for (i = 0; i < tp->thread_sib; i++) {
 625		if (!strcmp(buf, tp->thread_siblings[i]))
 626			break;
 627	}
 628	if (i == tp->thread_sib) {
 629		tp->thread_siblings[i] = buf;
 630		tp->thread_sib++;
 631		buf = NULL;
 632	}
 633	ret = 0;
 634done:
 635	if(fp)
 636		fclose(fp);
 637	free(buf);
 638	return ret;
 639}
 640
 641static void free_cpu_topo(struct cpu_topo *tp)
 642{
 643	u32 i;
 644
 645	if (!tp)
 646		return;
 647
 648	for (i = 0 ; i < tp->core_sib; i++)
 649		zfree(&tp->core_siblings[i]);
 650
 651	for (i = 0 ; i < tp->thread_sib; i++)
 652		zfree(&tp->thread_siblings[i]);
 653
 654	free(tp);
 655}
 656
 657static struct cpu_topo *build_cpu_topology(void)
 658{
 659	struct cpu_topo *tp = NULL;
 660	void *addr;
 661	u32 nr, i;
 662	size_t sz;
 663	long ncpus;
 664	int ret = -1;
 665	struct cpu_map *map;
 666
 667	ncpus = cpu__max_present_cpu();
 668
 669	/* build online CPU map */
 670	map = cpu_map__new(NULL);
 671	if (map == NULL) {
 672		pr_debug("failed to get system cpumap\n");
 673		return NULL;
 674	}
 675
 676	nr = (u32)(ncpus & UINT_MAX);
 677
 678	sz = nr * sizeof(char *);
 
 679	addr = calloc(1, sizeof(*tp) + 2 * sz);
 680	if (!addr)
 681		goto out_free;
 682
 683	tp = addr;
 684	tp->cpu_nr = nr;
 685	addr += sizeof(*tp);
 686	tp->core_siblings = addr;
 687	addr += sz;
 688	tp->thread_siblings = addr;
 689
 690	for (i = 0; i < nr; i++) {
 691		if (!cpu_map__has(map, i))
 692			continue;
 693
 694		ret = build_cpu_topo(tp, i);
 695		if (ret < 0)
 696			break;
 697	}
 698
 699out_free:
 700	cpu_map__put(map);
 701	if (ret) {
 702		free_cpu_topo(tp);
 703		tp = NULL;
 704	}
 705	return tp;
 706}
 707
 708static int write_cpu_topology(struct feat_fd *ff,
 709			      struct perf_evlist *evlist __maybe_unused)
 710{
 711	struct cpu_topo *tp;
 712	u32 i;
 713	int ret, j;
 714
 715	tp = build_cpu_topology();
 716	if (!tp)
 717		return -1;
 718
 719	ret = do_write(ff, &tp->core_sib, sizeof(tp->core_sib));
 720	if (ret < 0)
 721		goto done;
 722
 723	for (i = 0; i < tp->core_sib; i++) {
 724		ret = do_write_string(ff, tp->core_siblings[i]);
 725		if (ret < 0)
 726			goto done;
 727	}
 728	ret = do_write(ff, &tp->thread_sib, sizeof(tp->thread_sib));
 729	if (ret < 0)
 730		goto done;
 731
 732	for (i = 0; i < tp->thread_sib; i++) {
 733		ret = do_write_string(ff, tp->thread_siblings[i]);
 734		if (ret < 0)
 735			break;
 736	}
 737
 738	ret = perf_env__read_cpu_topology_map(&perf_env);
 739	if (ret < 0)
 740		goto done;
 741
 742	for (j = 0; j < perf_env.nr_cpus_avail; j++) {
 743		ret = do_write(ff, &perf_env.cpu[j].core_id,
 744			       sizeof(perf_env.cpu[j].core_id));
 745		if (ret < 0)
 746			return ret;
 747		ret = do_write(ff, &perf_env.cpu[j].socket_id,
 748			       sizeof(perf_env.cpu[j].socket_id));
 749		if (ret < 0)
 750			return ret;
 751	}
 752done:
 753	free_cpu_topo(tp);
 754	return ret;
 755}
 756
 757
 758
 759static int write_total_mem(struct feat_fd *ff,
 760			   struct perf_evlist *evlist __maybe_unused)
 761{
 762	char *buf = NULL;
 763	FILE *fp;
 764	size_t len = 0;
 765	int ret = -1, n;
 766	uint64_t mem;
 767
 768	fp = fopen("/proc/meminfo", "r");
 769	if (!fp)
 770		return -1;
 771
 772	while (getline(&buf, &len, fp) > 0) {
 773		ret = strncmp(buf, "MemTotal:", 9);
 774		if (!ret)
 775			break;
 776	}
 777	if (!ret) {
 778		n = sscanf(buf, "%*s %"PRIu64, &mem);
 779		if (n == 1)
 780			ret = do_write(ff, &mem, sizeof(mem));
 781	} else
 782		ret = -1;
 783	free(buf);
 784	fclose(fp);
 785	return ret;
 786}
 787
 788static int write_topo_node(struct feat_fd *ff, int node)
 789{
 790	char str[MAXPATHLEN];
 791	char field[32];
 792	char *buf = NULL, *p;
 793	size_t len = 0;
 794	FILE *fp;
 795	u64 mem_total, mem_free, mem;
 796	int ret = -1;
 797
 798	sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
 799	fp = fopen(str, "r");
 800	if (!fp)
 801		return -1;
 802
 803	while (getline(&buf, &len, fp) > 0) {
 804		/* skip over invalid lines */
 805		if (!strchr(buf, ':'))
 806			continue;
 807		if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
 808			goto done;
 809		if (!strcmp(field, "MemTotal:"))
 810			mem_total = mem;
 811		if (!strcmp(field, "MemFree:"))
 812			mem_free = mem;
 813	}
 814
 815	fclose(fp);
 816	fp = NULL;
 817
 818	ret = do_write(ff, &mem_total, sizeof(u64));
 819	if (ret)
 820		goto done;
 821
 822	ret = do_write(ff, &mem_free, sizeof(u64));
 823	if (ret)
 824		goto done;
 825
 826	ret = -1;
 827	sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
 828
 829	fp = fopen(str, "r");
 830	if (!fp)
 831		goto done;
 832
 833	if (getline(&buf, &len, fp) <= 0)
 834		goto done;
 835
 836	p = strchr(buf, '\n');
 837	if (p)
 838		*p = '\0';
 839
 840	ret = do_write_string(ff, buf);
 841done:
 842	free(buf);
 843	if (fp)
 844		fclose(fp);
 845	return ret;
 846}
 847
 848static int write_numa_topology(struct feat_fd *ff,
 849			       struct perf_evlist *evlist __maybe_unused)
 850{
 851	char *buf = NULL;
 852	size_t len = 0;
 853	FILE *fp;
 854	struct cpu_map *node_map = NULL;
 855	char *c;
 856	u32 nr, i, j;
 857	int ret = -1;
 858
 859	fp = fopen("/sys/devices/system/node/online", "r");
 860	if (!fp)
 861		return -1;
 862
 863	if (getline(&buf, &len, fp) <= 0)
 864		goto done;
 865
 866	c = strchr(buf, '\n');
 867	if (c)
 868		*c = '\0';
 869
 870	node_map = cpu_map__new(buf);
 871	if (!node_map)
 872		goto done;
 873
 874	nr = (u32)node_map->nr;
 875
 876	ret = do_write(ff, &nr, sizeof(nr));
 877	if (ret < 0)
 878		goto done;
 879
 880	for (i = 0; i < nr; i++) {
 881		j = (u32)node_map->map[i];
 882		ret = do_write(ff, &j, sizeof(j));
 883		if (ret < 0)
 884			break;
 885
 886		ret = write_topo_node(ff, i);
 887		if (ret < 0)
 888			break;
 889	}
 890done:
 891	free(buf);
 892	fclose(fp);
 893	cpu_map__put(node_map);
 894	return ret;
 895}
 896
 897/*
 898 * File format:
 899 *
 900 * struct pmu_mappings {
 901 *	u32	pmu_num;
 902 *	struct pmu_map {
 903 *		u32	type;
 904 *		char	name[];
 905 *	}[pmu_num];
 906 * };
 907 */
 908
 909static int write_pmu_mappings(struct feat_fd *ff,
 910			      struct perf_evlist *evlist __maybe_unused)
 911{
 912	struct perf_pmu *pmu = NULL;
 913	u32 pmu_num = 0;
 914	int ret;
 915
 916	/*
 917	 * Do a first pass to count number of pmu to avoid lseek so this
 918	 * works in pipe mode as well.
 919	 */
 920	while ((pmu = perf_pmu__scan(pmu))) {
 921		if (!pmu->name)
 922			continue;
 923		pmu_num++;
 924	}
 925
 926	ret = do_write(ff, &pmu_num, sizeof(pmu_num));
 927	if (ret < 0)
 928		return ret;
 929
 930	while ((pmu = perf_pmu__scan(pmu))) {
 931		if (!pmu->name)
 932			continue;
 933
 934		ret = do_write(ff, &pmu->type, sizeof(pmu->type));
 935		if (ret < 0)
 936			return ret;
 937
 938		ret = do_write_string(ff, pmu->name);
 939		if (ret < 0)
 940			return ret;
 941	}
 942
 943	return 0;
 944}
 945
 946/*
 947 * File format:
 948 *
 949 * struct group_descs {
 950 *	u32	nr_groups;
 951 *	struct group_desc {
 952 *		char	name[];
 953 *		u32	leader_idx;
 954 *		u32	nr_members;
 955 *	}[nr_groups];
 956 * };
 957 */
 958static int write_group_desc(struct feat_fd *ff,
 959			    struct perf_evlist *evlist)
 960{
 961	u32 nr_groups = evlist->nr_groups;
 962	struct perf_evsel *evsel;
 963	int ret;
 964
 965	ret = do_write(ff, &nr_groups, sizeof(nr_groups));
 966	if (ret < 0)
 967		return ret;
 968
 969	evlist__for_each_entry(evlist, evsel) {
 970		if (perf_evsel__is_group_leader(evsel) &&
 971		    evsel->nr_members > 1) {
 972			const char *name = evsel->group_name ?: "{anon_group}";
 973			u32 leader_idx = evsel->idx;
 974			u32 nr_members = evsel->nr_members;
 975
 976			ret = do_write_string(ff, name);
 977			if (ret < 0)
 978				return ret;
 979
 980			ret = do_write(ff, &leader_idx, sizeof(leader_idx));
 981			if (ret < 0)
 982				return ret;
 983
 984			ret = do_write(ff, &nr_members, sizeof(nr_members));
 985			if (ret < 0)
 986				return ret;
 987		}
 988	}
 989	return 0;
 990}
 991
 992/*
 993 * default get_cpuid(): nothing gets recorded
 994 * actual implementation must be in arch/$(SRCARCH)/util/header.c
 995 */
 996int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)
 997{
 998	return -1;
 999}
1000
1001static int write_cpuid(struct feat_fd *ff,
1002		       struct perf_evlist *evlist __maybe_unused)
1003{
1004	char buffer[64];
1005	int ret;
1006
1007	ret = get_cpuid(buffer, sizeof(buffer));
1008	if (!ret)
1009		goto write_it;
1010
1011	return -1;
1012write_it:
1013	return do_write_string(ff, buffer);
1014}
1015
1016static int write_branch_stack(struct feat_fd *ff __maybe_unused,
1017			      struct perf_evlist *evlist __maybe_unused)
1018{
1019	return 0;
1020}
1021
1022static int write_auxtrace(struct feat_fd *ff,
1023			  struct perf_evlist *evlist __maybe_unused)
1024{
1025	struct perf_session *session;
1026	int err;
1027
1028	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
1029		return -1;
1030
1031	session = container_of(ff->ph, struct perf_session, header);
1032
1033	err = auxtrace_index__write(ff->fd, &session->auxtrace_index);
1034	if (err < 0)
1035		pr_err("Failed to write auxtrace index\n");
1036	return err;
1037}
1038
1039static int cpu_cache_level__sort(const void *a, const void *b)
1040{
1041	struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
1042	struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
1043
1044	return cache_a->level - cache_b->level;
1045}
1046
1047static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
1048{
1049	if (a->level != b->level)
1050		return false;
1051
1052	if (a->line_size != b->line_size)
1053		return false;
1054
1055	if (a->sets != b->sets)
1056		return false;
1057
1058	if (a->ways != b->ways)
1059		return false;
1060
1061	if (strcmp(a->type, b->type))
1062		return false;
1063
1064	if (strcmp(a->size, b->size))
1065		return false;
1066
1067	if (strcmp(a->map, b->map))
1068		return false;
1069
1070	return true;
1071}
1072
1073static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
1074{
1075	char path[PATH_MAX], file[PATH_MAX];
1076	struct stat st;
1077	size_t len;
1078
1079	scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
1080	scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
1081
1082	if (stat(file, &st))
1083		return 1;
1084
1085	scnprintf(file, PATH_MAX, "%s/level", path);
1086	if (sysfs__read_int(file, (int *) &cache->level))
1087		return -1;
1088
1089	scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
1090	if (sysfs__read_int(file, (int *) &cache->line_size))
1091		return -1;
1092
1093	scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
1094	if (sysfs__read_int(file, (int *) &cache->sets))
1095		return -1;
1096
1097	scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
1098	if (sysfs__read_int(file, (int *) &cache->ways))
1099		return -1;
1100
1101	scnprintf(file, PATH_MAX, "%s/type", path);
1102	if (sysfs__read_str(file, &cache->type, &len))
1103		return -1;
1104
1105	cache->type[len] = 0;
1106	cache->type = rtrim(cache->type);
1107
1108	scnprintf(file, PATH_MAX, "%s/size", path);
1109	if (sysfs__read_str(file, &cache->size, &len)) {
1110		free(cache->type);
1111		return -1;
1112	}
1113
1114	cache->size[len] = 0;
1115	cache->size = rtrim(cache->size);
1116
1117	scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
1118	if (sysfs__read_str(file, &cache->map, &len)) {
1119		free(cache->map);
1120		free(cache->type);
1121		return -1;
1122	}
1123
1124	cache->map[len] = 0;
1125	cache->map = rtrim(cache->map);
1126	return 0;
1127}
1128
1129static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
1130{
1131	fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
1132}
1133
1134static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
1135{
1136	u32 i, cnt = 0;
1137	long ncpus;
1138	u32 nr, cpu;
1139	u16 level;
1140
1141	ncpus = sysconf(_SC_NPROCESSORS_CONF);
1142	if (ncpus < 0)
1143		return -1;
1144
1145	nr = (u32)(ncpus & UINT_MAX);
1146
1147	for (cpu = 0; cpu < nr; cpu++) {
1148		for (level = 0; level < 10; level++) {
1149			struct cpu_cache_level c;
1150			int err;
1151
1152			err = cpu_cache_level__read(&c, cpu, level);
1153			if (err < 0)
1154				return err;
1155
1156			if (err == 1)
1157				break;
1158
1159			for (i = 0; i < cnt; i++) {
1160				if (cpu_cache_level__cmp(&c, &caches[i]))
1161					break;
1162			}
1163
1164			if (i == cnt)
1165				caches[cnt++] = c;
1166			else
1167				cpu_cache_level__free(&c);
1168
1169			if (WARN_ONCE(cnt == size, "way too many cpu caches.."))
1170				goto out;
1171		}
1172	}
1173 out:
1174	*cntp = cnt;
1175	return 0;
1176}
1177
1178#define MAX_CACHES 2000
1179
1180static int write_cache(struct feat_fd *ff,
1181		       struct perf_evlist *evlist __maybe_unused)
1182{
1183	struct cpu_cache_level caches[MAX_CACHES];
1184	u32 cnt = 0, i, version = 1;
1185	int ret;
1186
1187	ret = build_caches(caches, MAX_CACHES, &cnt);
1188	if (ret)
1189		goto out;
1190
1191	qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1192
1193	ret = do_write(ff, &version, sizeof(u32));
1194	if (ret < 0)
1195		goto out;
1196
1197	ret = do_write(ff, &cnt, sizeof(u32));
1198	if (ret < 0)
1199		goto out;
1200
1201	for (i = 0; i < cnt; i++) {
1202		struct cpu_cache_level *c = &caches[i];
1203
1204		#define _W(v)					\
1205			ret = do_write(ff, &c->v, sizeof(u32));	\
1206			if (ret < 0)				\
1207				goto out;
1208
1209		_W(level)
1210		_W(line_size)
1211		_W(sets)
1212		_W(ways)
1213		#undef _W
1214
1215		#define _W(v)						\
1216			ret = do_write_string(ff, (const char *) c->v);	\
1217			if (ret < 0)					\
1218				goto out;
1219
1220		_W(type)
1221		_W(size)
1222		_W(map)
1223		#undef _W
1224	}
1225
1226out:
1227	for (i = 0; i < cnt; i++)
1228		cpu_cache_level__free(&caches[i]);
1229	return ret;
1230}
1231
1232static int write_stat(struct feat_fd *ff __maybe_unused,
1233		      struct perf_evlist *evlist __maybe_unused)
1234{
1235	return 0;
 
 
1236}
1237
1238static int write_sample_time(struct feat_fd *ff,
1239			     struct perf_evlist *evlist)
1240{
1241	int ret;
1242
1243	ret = do_write(ff, &evlist->first_sample_time,
1244		       sizeof(evlist->first_sample_time));
1245	if (ret < 0)
1246		return ret;
1247
1248	return do_write(ff, &evlist->last_sample_time,
1249			sizeof(evlist->last_sample_time));
1250}
1251
1252
1253static int memory_node__read(struct memory_node *n, unsigned long idx)
1254{
1255	unsigned int phys, size = 0;
1256	char path[PATH_MAX];
1257	struct dirent *ent;
1258	DIR *dir;
1259
1260#define for_each_memory(mem, dir)					\
1261	while ((ent = readdir(dir)))					\
1262		if (strcmp(ent->d_name, ".") &&				\
1263		    strcmp(ent->d_name, "..") &&			\
1264		    sscanf(ent->d_name, "memory%u", &mem) == 1)
1265
1266	scnprintf(path, PATH_MAX,
1267		  "%s/devices/system/node/node%lu",
1268		  sysfs__mountpoint(), idx);
1269
1270	dir = opendir(path);
1271	if (!dir) {
1272		pr_warning("failed: cant' open memory sysfs data\n");
1273		return -1;
1274	}
1275
1276	for_each_memory(phys, dir) {
1277		size = max(phys, size);
1278	}
1279
1280	size++;
1281
1282	n->set = bitmap_alloc(size);
1283	if (!n->set) {
1284		closedir(dir);
1285		return -ENOMEM;
1286	}
1287
1288	bitmap_zero(n->set, size);
1289	n->node = idx;
1290	n->size = size;
1291
1292	rewinddir(dir);
 
1293
1294	for_each_memory(phys, dir) {
1295		set_bit(phys, n->set);
1296	}
1297
1298	closedir(dir);
1299	return 0;
1300}
1301
1302static int memory_node__sort(const void *a, const void *b)
1303{
1304	const struct memory_node *na = a;
1305	const struct memory_node *nb = b;
1306
1307	return na->node - nb->node;
1308}
1309
1310static int build_mem_topology(struct memory_node *nodes, u64 size, u64 *cntp)
1311{
1312	char path[PATH_MAX];
1313	struct dirent *ent;
1314	DIR *dir;
1315	u64 cnt = 0;
1316	int ret = 0;
1317
1318	scnprintf(path, PATH_MAX, "%s/devices/system/node/",
1319		  sysfs__mountpoint());
1320
1321	dir = opendir(path);
1322	if (!dir) {
1323		pr_debug2("%s: could't read %s, does this arch have topology information?\n",
1324			  __func__, path);
1325		return -1;
1326	}
1327
1328	while (!ret && (ent = readdir(dir))) {
1329		unsigned int idx;
1330		int r;
1331
1332		if (!strcmp(ent->d_name, ".") ||
1333		    !strcmp(ent->d_name, ".."))
1334			continue;
1335
1336		r = sscanf(ent->d_name, "node%u", &idx);
1337		if (r != 1)
1338			continue;
1339
1340		if (WARN_ONCE(cnt >= size,
1341			      "failed to write MEM_TOPOLOGY, way too many nodes\n"))
1342			return -1;
1343
1344		ret = memory_node__read(&nodes[cnt++], idx);
1345	}
1346
1347	*cntp = cnt;
1348	closedir(dir);
1349
1350	if (!ret)
1351		qsort(nodes, cnt, sizeof(nodes[0]), memory_node__sort);
1352
1353	return ret;
1354}
1355
1356#define MAX_MEMORY_NODES 2000
1357
1358/*
1359 * The MEM_TOPOLOGY holds physical memory map for every
1360 * node in system. The format of data is as follows:
1361 *
1362 *  0 - version          | for future changes
1363 *  8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
1364 * 16 - count            | number of nodes
1365 *
1366 * For each node we store map of physical indexes for
1367 * each node:
1368 *
1369 * 32 - node id          | node index
1370 * 40 - size             | size of bitmap
1371 * 48 - bitmap           | bitmap of memory indexes that belongs to node
1372 */
1373static int write_mem_topology(struct feat_fd *ff __maybe_unused,
1374			      struct perf_evlist *evlist __maybe_unused)
1375{
1376	static struct memory_node nodes[MAX_MEMORY_NODES];
1377	u64 bsize, version = 1, i, nr;
1378	int ret;
1379
1380	ret = sysfs__read_xll("devices/system/memory/block_size_bytes",
1381			      (unsigned long long *) &bsize);
1382	if (ret)
1383		return ret;
1384
1385	ret = build_mem_topology(&nodes[0], MAX_MEMORY_NODES, &nr);
1386	if (ret)
1387		return ret;
1388
1389	ret = do_write(ff, &version, sizeof(version));
1390	if (ret < 0)
1391		goto out;
1392
1393	ret = do_write(ff, &bsize, sizeof(bsize));
1394	if (ret < 0)
1395		goto out;
1396
1397	ret = do_write(ff, &nr, sizeof(nr));
1398	if (ret < 0)
1399		goto out;
1400
1401	for (i = 0; i < nr; i++) {
1402		struct memory_node *n = &nodes[i];
1403
1404		#define _W(v)						\
1405			ret = do_write(ff, &n->v, sizeof(n->v));	\
1406			if (ret < 0)					\
1407				goto out;
1408
1409		_W(node)
1410		_W(size)
1411
1412		#undef _W
1413
1414		ret = do_write_bitmap(ff, n->set, n->size);
1415		if (ret < 0)
1416			goto out;
1417	}
1418
1419out:
1420	return ret;
1421}
1422
1423static void print_hostname(struct feat_fd *ff, FILE *fp)
1424{
1425	fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
1426}
1427
1428static void print_osrelease(struct feat_fd *ff, FILE *fp)
1429{
1430	fprintf(fp, "# os release : %s\n", ff->ph->env.os_release);
1431}
1432
1433static void print_arch(struct feat_fd *ff, FILE *fp)
1434{
1435	fprintf(fp, "# arch : %s\n", ff->ph->env.arch);
1436}
1437
1438static void print_cpudesc(struct feat_fd *ff, FILE *fp)
1439{
1440	fprintf(fp, "# cpudesc : %s\n", ff->ph->env.cpu_desc);
1441}
1442
1443static void print_nrcpus(struct feat_fd *ff, FILE *fp)
1444{
1445	fprintf(fp, "# nrcpus online : %u\n", ff->ph->env.nr_cpus_online);
1446	fprintf(fp, "# nrcpus avail : %u\n", ff->ph->env.nr_cpus_avail);
1447}
1448
1449static void print_version(struct feat_fd *ff, FILE *fp)
1450{
1451	fprintf(fp, "# perf version : %s\n", ff->ph->env.version);
1452}
1453
1454static void print_cmdline(struct feat_fd *ff, FILE *fp)
1455{
1456	int nr, i;
1457
1458	nr = ff->ph->env.nr_cmdline;
1459
1460	fprintf(fp, "# cmdline : ");
1461
1462	for (i = 0; i < nr; i++)
1463		fprintf(fp, "%s ", ff->ph->env.cmdline_argv[i]);
1464	fputc('\n', fp);
1465}
1466
1467static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
1468{
1469	struct perf_header *ph = ff->ph;
1470	int cpu_nr = ph->env.nr_cpus_avail;
1471	int nr, i;
1472	char *str;
1473
1474	nr = ph->env.nr_sibling_cores;
1475	str = ph->env.sibling_cores;
 
 
 
 
1476
1477	for (i = 0; i < nr; i++) {
 
1478		fprintf(fp, "# sibling cores   : %s\n", str);
1479		str += strlen(str) + 1;
1480	}
1481
1482	nr = ph->env.nr_sibling_threads;
1483	str = ph->env.sibling_threads;
 
 
 
 
1484
1485	for (i = 0; i < nr; i++) {
 
1486		fprintf(fp, "# sibling threads : %s\n", str);
1487		str += strlen(str) + 1;
1488	}
1489
1490	if (ph->env.cpu != NULL) {
1491		for (i = 0; i < cpu_nr; i++)
1492			fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
1493				ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
1494	} else
1495		fprintf(fp, "# Core ID and Socket ID information is not available\n");
1496}
1497
1498static void free_event_desc(struct perf_evsel *events)
1499{
1500	struct perf_evsel *evsel;
1501
1502	if (!events)
1503		return;
1504
1505	for (evsel = events; evsel->attr.size; evsel++) {
1506		zfree(&evsel->name);
1507		zfree(&evsel->id);
1508	}
1509
1510	free(events);
1511}
1512
1513static struct perf_evsel *read_event_desc(struct feat_fd *ff)
1514{
1515	struct perf_evsel *evsel, *events = NULL;
1516	u64 *id;
1517	void *buf = NULL;
 
1518	u32 nre, sz, nr, i, j;
 
1519	size_t msz;
1520
1521	/* number of events */
1522	if (do_read_u32(ff, &nre))
 
1523		goto error;
1524
1525	if (do_read_u32(ff, &sz))
 
 
 
 
1526		goto error;
1527
 
 
 
 
 
1528	/* buffer to hold on file attr struct */
1529	buf = malloc(sz);
1530	if (!buf)
1531		goto error;
1532
1533	/* the last event terminates with evsel->attr.size == 0: */
1534	events = calloc(nre + 1, sizeof(*events));
1535	if (!events)
1536		goto error;
1537
1538	msz = sizeof(evsel->attr);
1539	if (sz < msz)
1540		msz = sz;
1541
1542	for (i = 0, evsel = events; i < nre; evsel++, i++) {
1543		evsel->idx = i;
1544
1545		/*
1546		 * must read entire on-file attr struct to
1547		 * sync up with layout.
1548		 */
1549		if (__do_read(ff, buf, sz))
 
1550			goto error;
1551
1552		if (ff->ph->needs_swap)
1553			perf_event__attr_swap(buf);
1554
1555		memcpy(&evsel->attr, buf, msz);
1556
1557		if (do_read_u32(ff, &nr))
 
1558			goto error;
1559
1560		if (ff->ph->needs_swap)
1561			evsel->needs_swap = true;
1562
1563		evsel->name = do_read_string(ff);
1564		if (!evsel->name)
1565			goto error;
1566
1567		if (!nr)
1568			continue;
 
 
 
 
 
 
 
 
1569
1570		id = calloc(nr, sizeof(*id));
1571		if (!id)
1572			goto error;
1573		evsel->ids = nr;
1574		evsel->id = id;
1575
1576		for (j = 0 ; j < nr; j++) {
1577			if (do_read_u64(ff, id))
 
1578				goto error;
1579			id++;
1580		}
1581	}
1582out:
1583	free(buf);
1584	return events;
1585error:
1586	free_event_desc(events);
1587	events = NULL;
1588	goto out;
1589}
1590
1591static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1592				void *priv __maybe_unused)
1593{
1594	return fprintf(fp, ", %s = %s", name, val);
1595}
1596
1597static void print_event_desc(struct feat_fd *ff, FILE *fp)
1598{
1599	struct perf_evsel *evsel, *events;
1600	u32 j;
1601	u64 *id;
1602
1603	if (ff->events)
1604		events = ff->events;
1605	else
1606		events = read_event_desc(ff);
1607
1608	if (!events) {
1609		fprintf(fp, "# event desc: not available or unable to read\n");
1610		return;
1611	}
1612
1613	for (evsel = events; evsel->attr.size; evsel++) {
1614		fprintf(fp, "# event : name = %s, ", evsel->name);
1615
1616		if (evsel->ids) {
1617			fprintf(fp, ", id = {");
1618			for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1619				if (j)
1620					fputc(',', fp);
1621				fprintf(fp, " %"PRIu64, *id);
1622			}
1623			fprintf(fp, " }");
1624		}
1625
1626		perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1627
1628		fputc('\n', fp);
1629	}
1630
1631	free_event_desc(events);
1632	ff->events = NULL;
1633}
1634
1635static void print_total_mem(struct feat_fd *ff, FILE *fp)
1636{
1637	fprintf(fp, "# total memory : %llu kB\n", ff->ph->env.total_mem);
1638}
1639
1640static void print_numa_topology(struct feat_fd *ff, FILE *fp)
1641{
1642	int i;
1643	struct numa_node *n;
1644
1645	for (i = 0; i < ff->ph->env.nr_numa_nodes; i++) {
1646		n = &ff->ph->env.numa_nodes[i];
1647
1648		fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
1649			    " free = %"PRIu64" kB\n",
1650			n->node, n->mem_total, n->mem_free);
1651
1652		fprintf(fp, "# node%u cpu list : ", n->node);
1653		cpu_map__fprintf(n->map, fp);
1654	}
1655}
1656
1657static void print_cpuid(struct feat_fd *ff, FILE *fp)
1658{
1659	fprintf(fp, "# cpuid : %s\n", ff->ph->env.cpuid);
1660}
1661
1662static void print_branch_stack(struct feat_fd *ff __maybe_unused, FILE *fp)
1663{
1664	fprintf(fp, "# contains samples with branch stack\n");
1665}
1666
1667static void print_auxtrace(struct feat_fd *ff __maybe_unused, FILE *fp)
1668{
1669	fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1670}
1671
1672static void print_stat(struct feat_fd *ff __maybe_unused, FILE *fp)
1673{
1674	fprintf(fp, "# contains stat data\n");
 
1675}
1676
1677static void print_cache(struct feat_fd *ff, FILE *fp __maybe_unused)
1678{
1679	int i;
1680
1681	fprintf(fp, "# CPU cache info:\n");
1682	for (i = 0; i < ff->ph->env.caches_cnt; i++) {
1683		fprintf(fp, "#  ");
1684		cpu_cache_level__fprintf(fp, &ff->ph->env.caches[i]);
1685	}
1686}
1687
1688static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
1689{
1690	const char *delimiter = "# pmu mappings: ";
1691	char *str, *tmp;
1692	u32 pmu_num;
1693	u32 type;
1694
1695	pmu_num = ff->ph->env.nr_pmu_mappings;
1696	if (!pmu_num) {
1697		fprintf(fp, "# pmu mappings: not available\n");
1698		return;
1699	}
1700
1701	str = ff->ph->env.pmu_mappings;
1702
1703	while (pmu_num) {
1704		type = strtoul(str, &tmp, 0);
1705		if (*tmp != ':')
1706			goto error;
1707
1708		str = tmp + 1;
1709		fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1710
1711		delimiter = ", ";
1712		str += strlen(str) + 1;
1713		pmu_num--;
1714	}
1715
1716	fprintf(fp, "\n");
1717
1718	if (!pmu_num)
1719		return;
1720error:
1721	fprintf(fp, "# pmu mappings: unable to read\n");
1722}
1723
1724static void print_group_desc(struct feat_fd *ff, FILE *fp)
1725{
1726	struct perf_session *session;
1727	struct perf_evsel *evsel;
1728	u32 nr = 0;
1729
1730	session = container_of(ff->ph, struct perf_session, header);
 
 
1731
1732	evlist__for_each_entry(session->evlist, evsel) {
1733		if (perf_evsel__is_group_leader(evsel) &&
1734		    evsel->nr_members > 1) {
1735			fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1736				perf_evsel__name(evsel));
1737
1738			nr = evsel->nr_members - 1;
1739		} else if (nr) {
1740			fprintf(fp, ",%s", perf_evsel__name(evsel));
1741
1742			if (--nr == 0)
1743				fprintf(fp, "}\n");
 
1744		}
1745	}
1746}
1747
1748static void print_sample_time(struct feat_fd *ff, FILE *fp)
1749{
1750	struct perf_session *session;
1751	char time_buf[32];
1752	double d;
1753
1754	session = container_of(ff->ph, struct perf_session, header);
1755
1756	timestamp__scnprintf_usec(session->evlist->first_sample_time,
1757				  time_buf, sizeof(time_buf));
1758	fprintf(fp, "# time of first sample : %s\n", time_buf);
1759
1760	timestamp__scnprintf_usec(session->evlist->last_sample_time,
1761				  time_buf, sizeof(time_buf));
1762	fprintf(fp, "# time of last sample : %s\n", time_buf);
1763
1764	d = (double)(session->evlist->last_sample_time -
1765		session->evlist->first_sample_time) / NSEC_PER_MSEC;
1766
1767	fprintf(fp, "# sample duration : %10.3f ms\n", d);
 
 
 
 
 
 
1768}
1769
1770static void memory_node__fprintf(struct memory_node *n,
1771				 unsigned long long bsize, FILE *fp)
1772{
1773	char buf_map[100], buf_size[50];
1774	unsigned long long size;
1775
1776	size = bsize * bitmap_weight(n->set, n->size);
1777	unit_number__scnprintf(buf_size, 50, size);
1778
1779	bitmap_scnprintf(n->set, n->size, buf_map, 100);
1780	fprintf(fp, "#  %3" PRIu64 " [%s]: %s\n", n->node, buf_size, buf_map);
1781}
1782
1783static void print_mem_topology(struct feat_fd *ff, FILE *fp)
 
1784{
1785	struct memory_node *nodes;
1786	int i, nr;
1787
1788	nodes = ff->ph->env.memory_nodes;
1789	nr    = ff->ph->env.nr_memory_nodes;
1790
1791	fprintf(fp, "# memory nodes (nr %d, block size 0x%llx):\n",
1792		nr, ff->ph->env.memory_bsize);
1793
1794	for (i = 0; i < nr; i++) {
1795		memory_node__fprintf(&nodes[i], ff->ph->env.memory_bsize, fp);
1796	}
1797}
1798
1799static int __event_process_build_id(struct build_id_event *bev,
1800				    char *filename,
1801				    struct perf_session *session)
1802{
1803	int err = -1;
 
1804	struct machine *machine;
1805	u16 cpumode;
1806	struct dso *dso;
1807	enum dso_kernel_type dso_type;
1808
1809	machine = perf_session__findnew_machine(session, bev->pid);
1810	if (!machine)
1811		goto out;
1812
1813	cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1814
1815	switch (cpumode) {
1816	case PERF_RECORD_MISC_KERNEL:
1817		dso_type = DSO_TYPE_KERNEL;
 
1818		break;
1819	case PERF_RECORD_MISC_GUEST_KERNEL:
1820		dso_type = DSO_TYPE_GUEST_KERNEL;
 
1821		break;
1822	case PERF_RECORD_MISC_USER:
1823	case PERF_RECORD_MISC_GUEST_USER:
1824		dso_type = DSO_TYPE_USER;
 
1825		break;
1826	default:
1827		goto out;
1828	}
1829
1830	dso = machine__findnew_dso(machine, filename);
1831	if (dso != NULL) {
1832		char sbuild_id[SBUILD_ID_SIZE];
1833
1834		dso__set_build_id(dso, &bev->build_id);
1835
1836		if (dso_type != DSO_TYPE_USER) {
1837			struct kmod_path m = { .name = NULL, };
1838
1839			if (!kmod_path__parse_name(&m, filename) && m.kmod)
1840				dso__set_module_info(dso, &m, machine);
1841			else
1842				dso->kernel = dso_type;
1843
1844			free(m.name);
1845		}
1846
1847		build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1848				  sbuild_id);
1849		pr_debug("build id event received for %s: %s\n",
1850			 dso->long_name, sbuild_id);
1851		dso__put(dso);
1852	}
1853
1854	err = 0;
1855out:
1856	return err;
1857}
1858
1859static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1860						 int input, u64 offset, u64 size)
1861{
1862	struct perf_session *session = container_of(header, struct perf_session, header);
1863	struct {
1864		struct perf_event_header   header;
1865		u8			   build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1866		char			   filename[0];
1867	} old_bev;
1868	struct build_id_event bev;
1869	char filename[PATH_MAX];
1870	u64 limit = offset + size;
1871
1872	while (offset < limit) {
1873		ssize_t len;
1874
1875		if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1876			return -1;
1877
1878		if (header->needs_swap)
1879			perf_event_header__bswap(&old_bev.header);
1880
1881		len = old_bev.header.size - sizeof(old_bev);
1882		if (readn(input, filename, len) != len)
1883			return -1;
1884
1885		bev.header = old_bev.header;
1886
1887		/*
1888		 * As the pid is the missing value, we need to fill
1889		 * it properly. The header.misc value give us nice hint.
1890		 */
1891		bev.pid	= HOST_KERNEL_ID;
1892		if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1893		    bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1894			bev.pid	= DEFAULT_GUEST_KERNEL_ID;
1895
1896		memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1897		__event_process_build_id(&bev, filename, session);
1898
1899		offset += bev.header.size;
1900	}
1901
1902	return 0;
1903}
1904
1905static int perf_header__read_build_ids(struct perf_header *header,
1906				       int input, u64 offset, u64 size)
1907{
1908	struct perf_session *session = container_of(header, struct perf_session, header);
1909	struct build_id_event bev;
1910	char filename[PATH_MAX];
1911	u64 limit = offset + size, orig_offset = offset;
1912	int err = -1;
1913
1914	while (offset < limit) {
1915		ssize_t len;
1916
1917		if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1918			goto out;
1919
1920		if (header->needs_swap)
1921			perf_event_header__bswap(&bev.header);
1922
1923		len = bev.header.size - sizeof(bev);
1924		if (readn(input, filename, len) != len)
1925			goto out;
1926		/*
1927		 * The a1645ce1 changeset:
1928		 *
1929		 * "perf: 'perf kvm' tool for monitoring guest performance from host"
1930		 *
1931		 * Added a field to struct build_id_event that broke the file
1932		 * format.
1933		 *
1934		 * Since the kernel build-id is the first entry, process the
1935		 * table using the old format if the well known
1936		 * '[kernel.kallsyms]' string for the kernel build-id has the
1937		 * first 4 characters chopped off (where the pid_t sits).
1938		 */
1939		if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1940			if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1941				return -1;
1942			return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1943		}
1944
1945		__event_process_build_id(&bev, filename, session);
1946
1947		offset += bev.header.size;
1948	}
1949	err = 0;
1950out:
1951	return err;
1952}
1953
1954/* Macro for features that simply need to read and store a string. */
1955#define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
1956static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
1957{\
1958	ff->ph->env.__feat_env = do_read_string(ff); \
1959	return ff->ph->env.__feat_env ? 0 : -ENOMEM; \
1960}
1961
1962FEAT_PROCESS_STR_FUN(hostname, hostname);
1963FEAT_PROCESS_STR_FUN(osrelease, os_release);
1964FEAT_PROCESS_STR_FUN(version, version);
1965FEAT_PROCESS_STR_FUN(arch, arch);
1966FEAT_PROCESS_STR_FUN(cpudesc, cpu_desc);
1967FEAT_PROCESS_STR_FUN(cpuid, cpuid);
1968
1969static int process_tracing_data(struct feat_fd *ff, void *data)
1970{
1971	ssize_t ret = trace_report(ff->fd, data, false);
1972
1973	return ret < 0 ? -1 : 0;
1974}
1975
1976static int process_build_id(struct feat_fd *ff, void *data __maybe_unused)
1977{
1978	if (perf_header__read_build_ids(ff->ph, ff->fd, ff->offset, ff->size))
1979		pr_debug("Failed to read buildids, continuing...\n");
1980	return 0;
1981}
1982
1983static int process_nrcpus(struct feat_fd *ff, void *data __maybe_unused)
1984{
1985	int ret;
1986	u32 nr_cpus_avail, nr_cpus_online;
1987
1988	ret = do_read_u32(ff, &nr_cpus_avail);
1989	if (ret)
1990		return ret;
1991
1992	ret = do_read_u32(ff, &nr_cpus_online);
1993	if (ret)
1994		return ret;
1995	ff->ph->env.nr_cpus_avail = (int)nr_cpus_avail;
1996	ff->ph->env.nr_cpus_online = (int)nr_cpus_online;
1997	return 0;
1998}
1999
2000static int process_total_mem(struct feat_fd *ff, void *data __maybe_unused)
2001{
2002	u64 total_mem;
2003	int ret;
2004
2005	ret = do_read_u64(ff, &total_mem);
2006	if (ret)
2007		return -1;
2008	ff->ph->env.total_mem = (unsigned long long)total_mem;
2009	return 0;
2010}
2011
2012static struct perf_evsel *
2013perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
2014{
2015	struct perf_evsel *evsel;
2016
2017	evlist__for_each_entry(evlist, evsel) {
2018		if (evsel->idx == idx)
2019			return evsel;
2020	}
2021
2022	return NULL;
2023}
2024
2025static void
2026perf_evlist__set_event_name(struct perf_evlist *evlist,
2027			    struct perf_evsel *event)
2028{
2029	struct perf_evsel *evsel;
2030
2031	if (!event->name)
2032		return;
2033
2034	evsel = perf_evlist__find_by_index(evlist, event->idx);
2035	if (!evsel)
2036		return;
2037
2038	if (evsel->name)
2039		return;
2040
2041	evsel->name = strdup(event->name);
2042}
2043
2044static int
2045process_event_desc(struct feat_fd *ff, void *data __maybe_unused)
2046{
2047	struct perf_session *session;
2048	struct perf_evsel *evsel, *events = read_event_desc(ff);
2049
2050	if (!events)
2051		return 0;
2052
2053	session = container_of(ff->ph, struct perf_session, header);
2054
2055	if (session->data->is_pipe) {
2056		/* Save events for reading later by print_event_desc,
2057		 * since they can't be read again in pipe mode. */
2058		ff->events = events;
2059	}
2060
2061	for (evsel = events; evsel->attr.size; evsel++)
2062		perf_evlist__set_event_name(session->evlist, evsel);
2063
2064	if (!session->data->is_pipe)
2065		free_event_desc(events);
2066
2067	return 0;
2068}
2069
2070static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)
 
 
2071{
2072	char *str, *cmdline = NULL, **argv = NULL;
2073	u32 nr, i, len = 0;
2074
2075	if (do_read_u32(ff, &nr))
2076		return -1;
2077
2078	ff->ph->env.nr_cmdline = nr;
2079
2080	cmdline = zalloc(ff->size + nr + 1);
2081	if (!cmdline)
2082		return -1;
2083
2084	argv = zalloc(sizeof(char *) * (nr + 1));
2085	if (!argv)
2086		goto error;
2087
2088	for (i = 0; i < nr; i++) {
2089		str = do_read_string(ff);
2090		if (!str)
2091			goto error;
2092
2093		argv[i] = cmdline + len;
2094		memcpy(argv[i], str, strlen(str) + 1);
2095		len += strlen(str) + 1;
2096		free(str);
2097	}
2098	ff->ph->env.cmdline = cmdline;
2099	ff->ph->env.cmdline_argv = (const char **) argv;
2100	return 0;
2101
2102error:
2103	free(argv);
2104	free(cmdline);
2105	return -1;
2106}
2107
2108static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
2109{
2110	u32 nr, i;
2111	char *str;
2112	struct strbuf sb;
2113	int cpu_nr = ff->ph->env.nr_cpus_avail;
2114	u64 size = 0;
2115	struct perf_header *ph = ff->ph;
2116
2117	ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
2118	if (!ph->env.cpu)
2119		return -1;
2120
2121	if (do_read_u32(ff, &nr))
2122		goto free_cpu;
2123
2124	ph->env.nr_sibling_cores = nr;
2125	size += sizeof(u32);
2126	if (strbuf_init(&sb, 128) < 0)
2127		goto free_cpu;
2128
2129	for (i = 0; i < nr; i++) {
2130		str = do_read_string(ff);
2131		if (!str)
2132			goto error;
2133
2134		/* include a NULL character at the end */
2135		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2136			goto error;
2137		size += string_size(str);
2138		free(str);
2139	}
2140	ph->env.sibling_cores = strbuf_detach(&sb, NULL);
2141
2142	if (do_read_u32(ff, &nr))
2143		return -1;
2144
2145	ph->env.nr_sibling_threads = nr;
2146	size += sizeof(u32);
2147
2148	for (i = 0; i < nr; i++) {
2149		str = do_read_string(ff);
2150		if (!str)
2151			goto error;
2152
2153		/* include a NULL character at the end */
2154		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2155			goto error;
2156		size += string_size(str);
2157		free(str);
2158	}
2159	ph->env.sibling_threads = strbuf_detach(&sb, NULL);
2160
2161	/*
2162	 * The header may be from old perf,
2163	 * which doesn't include core id and socket id information.
2164	 */
2165	if (ff->size <= size) {
2166		zfree(&ph->env.cpu);
2167		return 0;
2168	}
2169
2170	for (i = 0; i < (u32)cpu_nr; i++) {
2171		if (do_read_u32(ff, &nr))
2172			goto free_cpu;
2173
2174		ph->env.cpu[i].core_id = nr;
2175
2176		if (do_read_u32(ff, &nr))
2177			goto free_cpu;
2178
2179		if (nr != (u32)-1 && nr > (u32)cpu_nr) {
2180			pr_debug("socket_id number is too big."
2181				 "You may need to upgrade the perf tool.\n");
2182			goto free_cpu;
2183		}
2184
2185		ph->env.cpu[i].socket_id = nr;
2186	}
2187
2188	return 0;
2189
2190error:
2191	strbuf_release(&sb);
2192free_cpu:
2193	zfree(&ph->env.cpu);
2194	return -1;
2195}
2196
2197static int process_numa_topology(struct feat_fd *ff, void *data __maybe_unused)
2198{
2199	struct numa_node *nodes, *n;
2200	u32 nr, i;
2201	char *str;
2202
2203	/* nr nodes */
2204	if (do_read_u32(ff, &nr))
2205		return -1;
2206
2207	nodes = zalloc(sizeof(*nodes) * nr);
2208	if (!nodes)
2209		return -ENOMEM;
2210
2211	for (i = 0; i < nr; i++) {
2212		n = &nodes[i];
2213
2214		/* node number */
2215		if (do_read_u32(ff, &n->node))
2216			goto error;
2217
2218		if (do_read_u64(ff, &n->mem_total))
2219			goto error;
2220
2221		if (do_read_u64(ff, &n->mem_free))
2222			goto error;
2223
2224		str = do_read_string(ff);
2225		if (!str)
2226			goto error;
2227
2228		n->map = cpu_map__new(str);
2229		if (!n->map)
2230			goto error;
2231
2232		free(str);
2233	}
2234	ff->ph->env.nr_numa_nodes = nr;
2235	ff->ph->env.numa_nodes = nodes;
2236	return 0;
2237
2238error:
2239	free(nodes);
2240	return -1;
2241}
2242
2243static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)
2244{
2245	char *name;
2246	u32 pmu_num;
2247	u32 type;
2248	struct strbuf sb;
2249
2250	if (do_read_u32(ff, &pmu_num))
2251		return -1;
2252
2253	if (!pmu_num) {
2254		pr_debug("pmu mappings not available\n");
2255		return 0;
2256	}
2257
2258	ff->ph->env.nr_pmu_mappings = pmu_num;
2259	if (strbuf_init(&sb, 128) < 0)
2260		return -1;
2261
2262	while (pmu_num) {
2263		if (do_read_u32(ff, &type))
2264			goto error;
2265
2266		name = do_read_string(ff);
2267		if (!name)
2268			goto error;
2269
2270		if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
2271			goto error;
2272		/* include a NULL character at the end */
2273		if (strbuf_add(&sb, "", 1) < 0)
2274			goto error;
2275
2276		if (!strcmp(name, "msr"))
2277			ff->ph->env.msr_pmu_type = type;
2278
2279		free(name);
2280		pmu_num--;
2281	}
2282	ff->ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
2283	return 0;
2284
2285error:
2286	strbuf_release(&sb);
2287	return -1;
2288}
2289
2290static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)
2291{
2292	size_t ret = -1;
2293	u32 i, nr, nr_groups;
2294	struct perf_session *session;
2295	struct perf_evsel *evsel, *leader = NULL;
2296	struct group_desc {
2297		char *name;
2298		u32 leader_idx;
2299		u32 nr_members;
2300	} *desc;
2301
2302	if (do_read_u32(ff, &nr_groups))
2303		return -1;
2304
2305	ff->ph->env.nr_groups = nr_groups;
2306	if (!nr_groups) {
2307		pr_debug("group desc not available\n");
2308		return 0;
2309	}
2310
2311	desc = calloc(nr_groups, sizeof(*desc));
2312	if (!desc)
2313		return -1;
2314
2315	for (i = 0; i < nr_groups; i++) {
2316		desc[i].name = do_read_string(ff);
2317		if (!desc[i].name)
2318			goto out_free;
2319
2320		if (do_read_u32(ff, &desc[i].leader_idx))
2321			goto out_free;
2322
2323		if (do_read_u32(ff, &desc[i].nr_members))
2324			goto out_free;
2325	}
2326
2327	/*
2328	 * Rebuild group relationship based on the group_desc
2329	 */
2330	session = container_of(ff->ph, struct perf_session, header);
2331	session->evlist->nr_groups = nr_groups;
2332
2333	i = nr = 0;
2334	evlist__for_each_entry(session->evlist, evsel) {
2335		if (evsel->idx == (int) desc[i].leader_idx) {
2336			evsel->leader = evsel;
2337			/* {anon_group} is a dummy name */
2338			if (strcmp(desc[i].name, "{anon_group}")) {
2339				evsel->group_name = desc[i].name;
2340				desc[i].name = NULL;
2341			}
2342			evsel->nr_members = desc[i].nr_members;
2343
2344			if (i >= nr_groups || nr > 0) {
2345				pr_debug("invalid group desc\n");
2346				goto out_free;
2347			}
2348
2349			leader = evsel;
2350			nr = evsel->nr_members - 1;
2351			i++;
2352		} else if (nr) {
2353			/* This is a group member */
2354			evsel->leader = leader;
2355
2356			nr--;
2357		}
2358	}
2359
2360	if (i != nr_groups || nr != 0) {
2361		pr_debug("invalid group desc\n");
2362		goto out_free;
2363	}
2364
2365	ret = 0;
2366out_free:
2367	for (i = 0; i < nr_groups; i++)
2368		zfree(&desc[i].name);
2369	free(desc);
2370
2371	return ret;
2372}
2373
2374static int process_auxtrace(struct feat_fd *ff, void *data __maybe_unused)
2375{
2376	struct perf_session *session;
2377	int err;
2378
2379	session = container_of(ff->ph, struct perf_session, header);
2380
2381	err = auxtrace_index__process(ff->fd, ff->size, session,
2382				      ff->ph->needs_swap);
2383	if (err < 0)
2384		pr_err("Failed to process auxtrace index\n");
2385	return err;
2386}
2387
2388static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
2389{
2390	struct cpu_cache_level *caches;
2391	u32 cnt, i, version;
2392
2393	if (do_read_u32(ff, &version))
2394		return -1;
2395
2396	if (version != 1)
2397		return -1;
2398
2399	if (do_read_u32(ff, &cnt))
2400		return -1;
2401
2402	caches = zalloc(sizeof(*caches) * cnt);
2403	if (!caches)
2404		return -1;
2405
2406	for (i = 0; i < cnt; i++) {
2407		struct cpu_cache_level c;
2408
2409		#define _R(v)						\
2410			if (do_read_u32(ff, &c.v))\
2411				goto out_free_caches;			\
2412
2413		_R(level)
2414		_R(line_size)
2415		_R(sets)
2416		_R(ways)
2417		#undef _R
2418
2419		#define _R(v)					\
2420			c.v = do_read_string(ff);		\
2421			if (!c.v)				\
2422				goto out_free_caches;
2423
2424		_R(type)
2425		_R(size)
2426		_R(map)
2427		#undef _R
2428
2429		caches[i] = c;
2430	}
2431
2432	ff->ph->env.caches = caches;
2433	ff->ph->env.caches_cnt = cnt;
2434	return 0;
2435out_free_caches:
2436	free(caches);
2437	return -1;
2438}
2439
2440static int process_sample_time(struct feat_fd *ff, void *data __maybe_unused)
2441{
2442	struct perf_session *session;
2443	u64 first_sample_time, last_sample_time;
2444	int ret;
2445
2446	session = container_of(ff->ph, struct perf_session, header);
2447
2448	ret = do_read_u64(ff, &first_sample_time);
2449	if (ret)
2450		return -1;
2451
2452	ret = do_read_u64(ff, &last_sample_time);
2453	if (ret)
2454		return -1;
2455
2456	session->evlist->first_sample_time = first_sample_time;
2457	session->evlist->last_sample_time = last_sample_time;
2458	return 0;
2459}
2460
2461static int process_mem_topology(struct feat_fd *ff,
2462				void *data __maybe_unused)
2463{
2464	struct memory_node *nodes;
2465	u64 version, i, nr, bsize;
2466	int ret = -1;
2467
2468	if (do_read_u64(ff, &version))
2469		return -1;
2470
2471	if (version != 1)
2472		return -1;
2473
2474	if (do_read_u64(ff, &bsize))
2475		return -1;
2476
2477	if (do_read_u64(ff, &nr))
2478		return -1;
2479
2480	nodes = zalloc(sizeof(*nodes) * nr);
2481	if (!nodes)
2482		return -1;
2483
2484	for (i = 0; i < nr; i++) {
2485		struct memory_node n;
2486
2487		#define _R(v)				\
2488			if (do_read_u64(ff, &n.v))	\
2489				goto out;		\
2490
2491		_R(node)
2492		_R(size)
2493
2494		#undef _R
2495
2496		if (do_read_bitmap(ff, &n.set, &n.size))
2497			goto out;
2498
2499		nodes[i] = n;
2500	}
2501
2502	ff->ph->env.memory_bsize    = bsize;
2503	ff->ph->env.memory_nodes    = nodes;
2504	ff->ph->env.nr_memory_nodes = nr;
2505	ret = 0;
2506
2507out:
2508	if (ret)
2509		free(nodes);
2510	return ret;
2511}
2512
2513struct feature_ops {
2514	int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
2515	void (*print)(struct feat_fd *ff, FILE *fp);
2516	int (*process)(struct feat_fd *ff, void *data);
 
2517	const char *name;
2518	bool full_only;
2519	bool synthesize;
2520};
2521
2522#define FEAT_OPR(n, func, __full_only) \
2523	[HEADER_##n] = {					\
2524		.name	    = __stringify(n),			\
2525		.write	    = write_##func,			\
2526		.print	    = print_##func,			\
2527		.full_only  = __full_only,			\
2528		.process    = process_##func,			\
2529		.synthesize = true				\
2530	}
2531
2532#define FEAT_OPN(n, func, __full_only) \
2533	[HEADER_##n] = {					\
2534		.name	    = __stringify(n),			\
2535		.write	    = write_##func,			\
2536		.print	    = print_##func,			\
2537		.full_only  = __full_only,			\
2538		.process    = process_##func			\
2539	}
2540
2541/* feature_ops not implemented: */
2542#define print_tracing_data	NULL
2543#define print_build_id		NULL
2544
2545#define process_branch_stack	NULL
2546#define process_stat		NULL
2547
2548
2549static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2550	FEAT_OPN(TRACING_DATA,	tracing_data,	false),
2551	FEAT_OPN(BUILD_ID,	build_id,	false),
2552	FEAT_OPR(HOSTNAME,	hostname,	false),
2553	FEAT_OPR(OSRELEASE,	osrelease,	false),
2554	FEAT_OPR(VERSION,	version,	false),
2555	FEAT_OPR(ARCH,		arch,		false),
2556	FEAT_OPR(NRCPUS,	nrcpus,		false),
2557	FEAT_OPR(CPUDESC,	cpudesc,	false),
2558	FEAT_OPR(CPUID,		cpuid,		false),
2559	FEAT_OPR(TOTAL_MEM,	total_mem,	false),
2560	FEAT_OPR(EVENT_DESC,	event_desc,	false),
2561	FEAT_OPR(CMDLINE,	cmdline,	false),
2562	FEAT_OPR(CPU_TOPOLOGY,	cpu_topology,	true),
2563	FEAT_OPR(NUMA_TOPOLOGY,	numa_topology,	true),
2564	FEAT_OPN(BRANCH_STACK,	branch_stack,	false),
2565	FEAT_OPR(PMU_MAPPINGS,	pmu_mappings,	false),
2566	FEAT_OPN(GROUP_DESC,	group_desc,	false),
2567	FEAT_OPN(AUXTRACE,	auxtrace,	false),
2568	FEAT_OPN(STAT,		stat,		false),
2569	FEAT_OPN(CACHE,		cache,		true),
2570	FEAT_OPR(SAMPLE_TIME,	sample_time,	false),
2571	FEAT_OPR(MEM_TOPOLOGY,	mem_topology,	true),
2572};
2573
2574struct header_print_data {
2575	FILE *fp;
2576	bool full; /* extended list of headers */
2577};
2578
2579static int perf_file_section__fprintf_info(struct perf_file_section *section,
2580					   struct perf_header *ph,
2581					   int feat, int fd, void *data)
2582{
2583	struct header_print_data *hd = data;
2584	struct feat_fd ff;
2585
2586	if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2587		pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2588				"%d, continuing...\n", section->offset, feat);
2589		return 0;
2590	}
2591	if (feat >= HEADER_LAST_FEATURE) {
2592		pr_warning("unknown feature %d\n", feat);
2593		return 0;
2594	}
2595	if (!feat_ops[feat].print)
2596		return 0;
2597
2598	ff = (struct  feat_fd) {
2599		.fd = fd,
2600		.ph = ph,
2601	};
2602
2603	if (!feat_ops[feat].full_only || hd->full)
2604		feat_ops[feat].print(&ff, hd->fp);
2605	else
2606		fprintf(hd->fp, "# %s info available, use -I to display\n",
2607			feat_ops[feat].name);
2608
2609	return 0;
2610}
2611
2612int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2613{
2614	struct header_print_data hd;
2615	struct perf_header *header = &session->header;
2616	int fd = perf_data__fd(session->data);
2617	struct stat st;
2618	int ret, bit;
2619
2620	hd.fp = fp;
2621	hd.full = full;
2622
2623	ret = fstat(fd, &st);
2624	if (ret == -1)
2625		return -1;
2626
2627	fprintf(fp, "# captured on    : %s", ctime(&st.st_ctime));
2628
2629	fprintf(fp, "# header version : %u\n", header->version);
2630	fprintf(fp, "# data offset    : %" PRIu64 "\n", header->data_offset);
2631	fprintf(fp, "# data size      : %" PRIu64 "\n", header->data_size);
2632	fprintf(fp, "# feat offset    : %" PRIu64 "\n", header->feat_offset);
2633
2634	perf_header__process_sections(header, fd, &hd,
2635				      perf_file_section__fprintf_info);
2636
2637	if (session->data->is_pipe)
2638		return 0;
2639
2640	fprintf(fp, "# missing features: ");
2641	for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {
2642		if (bit)
2643			fprintf(fp, "%s ", feat_ops[bit].name);
2644	}
2645
2646	fprintf(fp, "\n");
2647	return 0;
2648}
2649
2650static int do_write_feat(struct feat_fd *ff, int type,
2651			 struct perf_file_section **p,
2652			 struct perf_evlist *evlist)
2653{
2654	int err;
2655	int ret = 0;
2656
2657	if (perf_header__has_feat(ff->ph, type)) {
2658		if (!feat_ops[type].write)
2659			return -1;
2660
2661		if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
2662			return -1;
2663
2664		(*p)->offset = lseek(ff->fd, 0, SEEK_CUR);
2665
2666		err = feat_ops[type].write(ff, evlist);
2667		if (err < 0) {
2668			pr_debug("failed to write feature %s\n", feat_ops[type].name);
2669
2670			/* undo anything written */
2671			lseek(ff->fd, (*p)->offset, SEEK_SET);
2672
2673			return -1;
2674		}
2675		(*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;
2676		(*p)++;
2677	}
2678	return ret;
2679}
2680
2681static int perf_header__adds_write(struct perf_header *header,
2682				   struct perf_evlist *evlist, int fd)
2683{
2684	int nr_sections;
2685	struct feat_fd ff;
2686	struct perf_file_section *feat_sec, *p;
2687	int sec_size;
2688	u64 sec_start;
2689	int feat;
2690	int err;
2691
2692	ff = (struct feat_fd){
2693		.fd  = fd,
2694		.ph = header,
2695	};
2696
2697	nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2698	if (!nr_sections)
2699		return 0;
2700
2701	feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2702	if (feat_sec == NULL)
2703		return -ENOMEM;
2704
2705	sec_size = sizeof(*feat_sec) * nr_sections;
2706
2707	sec_start = header->feat_offset;
2708	lseek(fd, sec_start + sec_size, SEEK_SET);
2709
2710	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2711		if (do_write_feat(&ff, feat, &p, evlist))
2712			perf_header__clear_feat(header, feat);
2713	}
2714
2715	lseek(fd, sec_start, SEEK_SET);
2716	/*
2717	 * may write more than needed due to dropped feature, but
2718	 * this is okay, reader will skip the mising entries
2719	 */
2720	err = do_write(&ff, feat_sec, sec_size);
2721	if (err < 0)
2722		pr_debug("failed to write feature section\n");
2723	free(feat_sec);
2724	return err;
2725}
2726
2727int perf_header__write_pipe(int fd)
2728{
2729	struct perf_pipe_file_header f_header;
2730	struct feat_fd ff;
2731	int err;
2732
2733	ff = (struct feat_fd){ .fd = fd };
2734
2735	f_header = (struct perf_pipe_file_header){
2736		.magic	   = PERF_MAGIC,
2737		.size	   = sizeof(f_header),
2738	};
2739
2740	err = do_write(&ff, &f_header, sizeof(f_header));
2741	if (err < 0) {
2742		pr_debug("failed to write perf pipe header\n");
2743		return err;
2744	}
2745
2746	return 0;
2747}
2748
2749int perf_session__write_header(struct perf_session *session,
2750			       struct perf_evlist *evlist,
2751			       int fd, bool at_exit)
2752{
2753	struct perf_file_header f_header;
2754	struct perf_file_attr   f_attr;
2755	struct perf_header *header = &session->header;
2756	struct perf_evsel *evsel;
2757	struct feat_fd ff;
2758	u64 attr_offset;
2759	int err;
2760
2761	ff = (struct feat_fd){ .fd = fd};
2762	lseek(fd, sizeof(f_header), SEEK_SET);
2763
2764	evlist__for_each_entry(session->evlist, evsel) {
2765		evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2766		err = do_write(&ff, evsel->id, evsel->ids * sizeof(u64));
 
 
 
2767		if (err < 0) {
 
2768			pr_debug("failed to write perf header\n");
2769			return err;
2770		}
 
 
 
 
 
 
 
2771	}
2772
2773	attr_offset = lseek(ff.fd, 0, SEEK_CUR);
2774
2775	evlist__for_each_entry(evlist, evsel) {
2776		f_attr = (struct perf_file_attr){
2777			.attr = evsel->attr,
2778			.ids  = {
2779				.offset = evsel->id_offset,
2780				.size   = evsel->ids * sizeof(u64),
2781			}
2782		};
2783		err = do_write(&ff, &f_attr, sizeof(f_attr));
2784		if (err < 0) {
2785			pr_debug("failed to write perf header attribute\n");
2786			return err;
2787		}
2788	}
2789
2790	if (!header->data_offset)
2791		header->data_offset = lseek(fd, 0, SEEK_CUR);
2792	header->feat_offset = header->data_offset + header->data_size;
 
 
 
 
 
 
 
 
2793
2794	if (at_exit) {
2795		err = perf_header__adds_write(header, evlist, fd);
2796		if (err < 0)
2797			return err;
2798	}
2799
2800	f_header = (struct perf_file_header){
2801		.magic	   = PERF_MAGIC,
2802		.size	   = sizeof(f_header),
2803		.attr_size = sizeof(f_attr),
2804		.attrs = {
2805			.offset = attr_offset,
2806			.size   = evlist->nr_entries * sizeof(f_attr),
2807		},
2808		.data = {
2809			.offset = header->data_offset,
2810			.size	= header->data_size,
2811		},
2812		/* event_types is ignored, store zeros */
 
 
 
2813	};
2814
2815	memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2816
2817	lseek(fd, 0, SEEK_SET);
2818	err = do_write(&ff, &f_header, sizeof(f_header));
2819	if (err < 0) {
2820		pr_debug("failed to write perf header\n");
2821		return err;
2822	}
2823	lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2824
 
2825	return 0;
2826}
2827
2828static int perf_header__getbuffer64(struct perf_header *header,
2829				    int fd, void *buf, size_t size)
2830{
2831	if (readn(fd, buf, size) <= 0)
2832		return -1;
2833
2834	if (header->needs_swap)
2835		mem_bswap_64(buf, size);
2836
2837	return 0;
2838}
2839
2840int perf_header__process_sections(struct perf_header *header, int fd,
2841				  void *data,
2842				  int (*process)(struct perf_file_section *section,
2843						 struct perf_header *ph,
2844						 int feat, int fd, void *data))
2845{
2846	struct perf_file_section *feat_sec, *sec;
2847	int nr_sections;
2848	int sec_size;
2849	int feat;
2850	int err;
2851
2852	nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2853	if (!nr_sections)
2854		return 0;
2855
2856	feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2857	if (!feat_sec)
2858		return -1;
2859
2860	sec_size = sizeof(*feat_sec) * nr_sections;
2861
2862	lseek(fd, header->feat_offset, SEEK_SET);
2863
2864	err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2865	if (err < 0)
2866		goto out_free;
2867
2868	for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2869		err = process(sec++, header, feat, fd, data);
2870		if (err < 0)
2871			goto out_free;
2872	}
2873	err = 0;
2874out_free:
2875	free(feat_sec);
2876	return err;
2877}
2878
2879static const int attr_file_abi_sizes[] = {
2880	[0] = PERF_ATTR_SIZE_VER0,
2881	[1] = PERF_ATTR_SIZE_VER1,
2882	[2] = PERF_ATTR_SIZE_VER2,
2883	[3] = PERF_ATTR_SIZE_VER3,
2884	[4] = PERF_ATTR_SIZE_VER4,
2885	0,
2886};
2887
2888/*
2889 * In the legacy file format, the magic number is not used to encode endianness.
2890 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2891 * on ABI revisions, we need to try all combinations for all endianness to
2892 * detect the endianness.
2893 */
2894static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2895{
2896	uint64_t ref_size, attr_size;
2897	int i;
2898
2899	for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2900		ref_size = attr_file_abi_sizes[i]
2901			 + sizeof(struct perf_file_section);
2902		if (hdr_sz != ref_size) {
2903			attr_size = bswap_64(hdr_sz);
2904			if (attr_size != ref_size)
2905				continue;
2906
2907			ph->needs_swap = true;
2908		}
2909		pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2910			 i,
2911			 ph->needs_swap);
2912		return 0;
2913	}
2914	/* could not determine endianness */
2915	return -1;
2916}
2917
2918#define PERF_PIPE_HDR_VER0	16
2919
2920static const size_t attr_pipe_abi_sizes[] = {
2921	[0] = PERF_PIPE_HDR_VER0,
2922	0,
2923};
2924
2925/*
2926 * In the legacy pipe format, there is an implicit assumption that endiannesss
2927 * between host recording the samples, and host parsing the samples is the
2928 * same. This is not always the case given that the pipe output may always be
2929 * redirected into a file and analyzed on a different machine with possibly a
2930 * different endianness and perf_event ABI revsions in the perf tool itself.
2931 */
2932static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2933{
2934	u64 attr_size;
2935	int i;
2936
2937	for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2938		if (hdr_sz != attr_pipe_abi_sizes[i]) {
2939			attr_size = bswap_64(hdr_sz);
2940			if (attr_size != hdr_sz)
2941				continue;
2942
2943			ph->needs_swap = true;
2944		}
2945		pr_debug("Pipe ABI%d perf.data file detected\n", i);
2946		return 0;
2947	}
2948	return -1;
2949}
2950
2951bool is_perf_magic(u64 magic)
2952{
2953	if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2954		|| magic == __perf_magic2
2955		|| magic == __perf_magic2_sw)
2956		return true;
2957
2958	return false;
2959}
2960
2961static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2962			      bool is_pipe, struct perf_header *ph)
2963{
2964	int ret;
2965
2966	/* check for legacy format */
2967	ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2968	if (ret == 0) {
2969		ph->version = PERF_HEADER_VERSION_1;
2970		pr_debug("legacy perf.data format\n");
2971		if (is_pipe)
2972			return try_all_pipe_abis(hdr_sz, ph);
2973
2974		return try_all_file_abis(hdr_sz, ph);
2975	}
2976	/*
2977	 * the new magic number serves two purposes:
2978	 * - unique number to identify actual perf.data files
2979	 * - encode endianness of file
2980	 */
2981	ph->version = PERF_HEADER_VERSION_2;
2982
2983	/* check magic number with one endianness */
2984	if (magic == __perf_magic2)
2985		return 0;
2986
2987	/* check magic number with opposite endianness */
2988	if (magic != __perf_magic2_sw)
2989		return -1;
2990
2991	ph->needs_swap = true;
2992
2993	return 0;
2994}
2995
2996int perf_file_header__read(struct perf_file_header *header,
2997			   struct perf_header *ph, int fd)
2998{
2999	ssize_t ret;
3000
3001	lseek(fd, 0, SEEK_SET);
3002
3003	ret = readn(fd, header, sizeof(*header));
3004	if (ret <= 0)
3005		return -1;
3006
3007	if (check_magic_endian(header->magic,
3008			       header->attr_size, false, ph) < 0) {
3009		pr_debug("magic/endian check failed\n");
3010		return -1;
3011	}
3012
3013	if (ph->needs_swap) {
3014		mem_bswap_64(header, offsetof(struct perf_file_header,
3015			     adds_features));
3016	}
3017
3018	if (header->size != sizeof(*header)) {
3019		/* Support the previous format */
3020		if (header->size == offsetof(typeof(*header), adds_features))
3021			bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
3022		else
3023			return -1;
3024	} else if (ph->needs_swap) {
3025		/*
3026		 * feature bitmap is declared as an array of unsigned longs --
3027		 * not good since its size can differ between the host that
3028		 * generated the data file and the host analyzing the file.
3029		 *
3030		 * We need to handle endianness, but we don't know the size of
3031		 * the unsigned long where the file was generated. Take a best
3032		 * guess at determining it: try 64-bit swap first (ie., file
3033		 * created on a 64-bit host), and check if the hostname feature
3034		 * bit is set (this feature bit is forced on as of fbe96f2).
3035		 * If the bit is not, undo the 64-bit swap and try a 32-bit
3036		 * swap. If the hostname bit is still not set (e.g., older data
3037		 * file), punt and fallback to the original behavior --
3038		 * clearing all feature bits and setting buildid.
3039		 */
3040		mem_bswap_64(&header->adds_features,
3041			    BITS_TO_U64(HEADER_FEAT_BITS));
3042
3043		if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
3044			/* unswap as u64 */
3045			mem_bswap_64(&header->adds_features,
3046				    BITS_TO_U64(HEADER_FEAT_BITS));
3047
3048			/* unswap as u32 */
3049			mem_bswap_32(&header->adds_features,
3050				    BITS_TO_U32(HEADER_FEAT_BITS));
3051		}
3052
3053		if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
3054			bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
3055			set_bit(HEADER_BUILD_ID, header->adds_features);
3056		}
3057	}
3058
3059	memcpy(&ph->adds_features, &header->adds_features,
3060	       sizeof(ph->adds_features));
3061
 
 
3062	ph->data_offset  = header->data.offset;
3063	ph->data_size	 = header->data.size;
3064	ph->feat_offset  = header->data.offset + header->data.size;
3065	return 0;
3066}
3067
3068static int perf_file_section__process(struct perf_file_section *section,
3069				      struct perf_header *ph,
3070				      int feat, int fd, void *data)
3071{
3072	struct feat_fd fdd = {
3073		.fd	= fd,
3074		.ph	= ph,
3075		.size	= section->size,
3076		.offset	= section->offset,
3077	};
3078
3079	if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
3080		pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
3081			  "%d, continuing...\n", section->offset, feat);
3082		return 0;
3083	}
3084
3085	if (feat >= HEADER_LAST_FEATURE) {
3086		pr_debug("unknown feature %d, continuing...\n", feat);
3087		return 0;
3088	}
3089
3090	if (!feat_ops[feat].process)
3091		return 0;
3092
3093	return feat_ops[feat].process(&fdd, data);
3094}
3095
3096static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
3097				       struct perf_header *ph, int fd,
3098				       bool repipe)
3099{
3100	struct feat_fd ff = {
3101		.fd = STDOUT_FILENO,
3102		.ph = ph,
3103	};
3104	ssize_t ret;
3105
3106	ret = readn(fd, header, sizeof(*header));
3107	if (ret <= 0)
3108		return -1;
3109
3110	if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
3111		pr_debug("endian/magic failed\n");
3112		return -1;
3113	}
3114
3115	if (ph->needs_swap)
3116		header->size = bswap_64(header->size);
3117
3118	if (repipe && do_write(&ff, header, sizeof(*header)) < 0)
3119		return -1;
3120
3121	return 0;
3122}
3123
3124static int perf_header__read_pipe(struct perf_session *session)
3125{
3126	struct perf_header *header = &session->header;
3127	struct perf_pipe_file_header f_header;
3128
3129	if (perf_file_header__read_pipe(&f_header, header,
3130					perf_data__fd(session->data),
3131					session->repipe) < 0) {
3132		pr_debug("incompatible file format\n");
3133		return -EINVAL;
3134	}
3135
 
 
3136	return 0;
3137}
3138
3139static int read_attr(int fd, struct perf_header *ph,
3140		     struct perf_file_attr *f_attr)
3141{
3142	struct perf_event_attr *attr = &f_attr->attr;
3143	size_t sz, left;
3144	size_t our_sz = sizeof(f_attr->attr);
3145	ssize_t ret;
3146
3147	memset(f_attr, 0, sizeof(*f_attr));
3148
3149	/* read minimal guaranteed structure */
3150	ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
3151	if (ret <= 0) {
3152		pr_debug("cannot read %d bytes of header attr\n",
3153			 PERF_ATTR_SIZE_VER0);
3154		return -1;
3155	}
3156
3157	/* on file perf_event_attr size */
3158	sz = attr->size;
3159
3160	if (ph->needs_swap)
3161		sz = bswap_32(sz);
3162
3163	if (sz == 0) {
3164		/* assume ABI0 */
3165		sz =  PERF_ATTR_SIZE_VER0;
3166	} else if (sz > our_sz) {
3167		pr_debug("file uses a more recent and unsupported ABI"
3168			 " (%zu bytes extra)\n", sz - our_sz);
3169		return -1;
3170	}
3171	/* what we have not yet read and that we know about */
3172	left = sz - PERF_ATTR_SIZE_VER0;
3173	if (left) {
3174		void *ptr = attr;
3175		ptr += PERF_ATTR_SIZE_VER0;
3176
3177		ret = readn(fd, ptr, left);
3178	}
3179	/* read perf_file_section, ids are read in caller */
3180	ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
3181
3182	return ret <= 0 ? -1 : 0;
3183}
3184
3185static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
3186						struct pevent *pevent)
3187{
3188	struct event_format *event;
3189	char bf[128];
3190
3191	/* already prepared */
3192	if (evsel->tp_format)
3193		return 0;
3194
3195	if (pevent == NULL) {
3196		pr_debug("broken or missing trace data\n");
3197		return -1;
3198	}
3199
3200	event = pevent_find_event(pevent, evsel->attr.config);
3201	if (event == NULL) {
3202		pr_debug("cannot find event format for %d\n", (int)evsel->attr.config);
3203		return -1;
3204	}
3205
3206	if (!evsel->name) {
3207		snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
3208		evsel->name = strdup(bf);
3209		if (evsel->name == NULL)
3210			return -1;
3211	}
3212
3213	evsel->tp_format = event;
3214	return 0;
3215}
3216
3217static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
3218						  struct pevent *pevent)
3219{
3220	struct perf_evsel *pos;
3221
3222	evlist__for_each_entry(evlist, pos) {
3223		if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
3224		    perf_evsel__prepare_tracepoint_event(pos, pevent))
3225			return -1;
3226	}
3227
3228	return 0;
3229}
3230
3231int perf_session__read_header(struct perf_session *session)
3232{
3233	struct perf_data *data = session->data;
3234	struct perf_header *header = &session->header;
3235	struct perf_file_header	f_header;
3236	struct perf_file_attr	f_attr;
3237	u64			f_id;
3238	int nr_attrs, nr_ids, i, j;
3239	int fd = perf_data__fd(data);
3240
3241	session->evlist = perf_evlist__new();
3242	if (session->evlist == NULL)
3243		return -ENOMEM;
3244
3245	session->evlist->env = &header->env;
3246	session->machines.host.env = &header->env;
3247	if (perf_data__is_pipe(data))
3248		return perf_header__read_pipe(session);
3249
3250	if (perf_file_header__read(&f_header, header, fd) < 0)
3251		return -EINVAL;
3252
3253	/*
3254	 * Sanity check that perf.data was written cleanly; data size is
3255	 * initialized to 0 and updated only if the on_exit function is run.
3256	 * If data size is still 0 then the file contains only partial
3257	 * information.  Just warn user and process it as much as it can.
3258	 */
3259	if (f_header.data.size == 0) {
3260		pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
3261			   "Was the 'perf record' command properly terminated?\n",
3262			   data->file.path);
3263	}
3264
3265	nr_attrs = f_header.attrs.size / f_header.attr_size;
3266	lseek(fd, f_header.attrs.offset, SEEK_SET);
3267
3268	for (i = 0; i < nr_attrs; i++) {
3269		struct perf_evsel *evsel;
3270		off_t tmp;
3271
3272		if (read_attr(fd, header, &f_attr) < 0)
3273			goto out_errno;
3274
3275		if (header->needs_swap) {
3276			f_attr.ids.size   = bswap_64(f_attr.ids.size);
3277			f_attr.ids.offset = bswap_64(f_attr.ids.offset);
3278			perf_event__attr_swap(&f_attr.attr);
3279		}
3280
3281		tmp = lseek(fd, 0, SEEK_CUR);
3282		evsel = perf_evsel__new(&f_attr.attr);
3283
3284		if (evsel == NULL)
3285			goto out_delete_evlist;
3286
3287		evsel->needs_swap = header->needs_swap;
3288		/*
3289		 * Do it before so that if perf_evsel__alloc_id fails, this
3290		 * entry gets purged too at perf_evlist__delete().
3291		 */
3292		perf_evlist__add(session->evlist, evsel);
3293
3294		nr_ids = f_attr.ids.size / sizeof(u64);
3295		/*
3296		 * We don't have the cpu and thread maps on the header, so
3297		 * for allocating the perf_sample_id table we fake 1 cpu and
3298		 * hattr->ids threads.
3299		 */
3300		if (perf_evsel__alloc_id(evsel, 1, nr_ids))
3301			goto out_delete_evlist;
3302
3303		lseek(fd, f_attr.ids.offset, SEEK_SET);
3304
3305		for (j = 0; j < nr_ids; j++) {
3306			if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
3307				goto out_errno;
3308
3309			perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
3310		}
3311
3312		lseek(fd, tmp, SEEK_SET);
3313	}
3314
3315	symbol_conf.nr_events = nr_attrs;
3316
3317	perf_header__process_sections(header, fd, &session->tevent,
 
 
 
 
 
 
 
 
 
 
 
3318				      perf_file_section__process);
3319
3320	if (perf_evlist__prepare_tracepoint_events(session->evlist,
3321						   session->tevent.pevent))
 
3322		goto out_delete_evlist;
3323
 
3324	return 0;
3325out_errno:
3326	return -errno;
3327
3328out_delete_evlist:
3329	perf_evlist__delete(session->evlist);
3330	session->evlist = NULL;
3331	return -ENOMEM;
3332}
3333
3334int perf_event__synthesize_attr(struct perf_tool *tool,
3335				struct perf_event_attr *attr, u32 ids, u64 *id,
3336				perf_event__handler_t process)
3337{
3338	union perf_event *ev;
3339	size_t size;
3340	int err;
3341
3342	size = sizeof(struct perf_event_attr);
3343	size = PERF_ALIGN(size, sizeof(u64));
3344	size += sizeof(struct perf_event_header);
3345	size += ids * sizeof(u64);
3346
3347	ev = malloc(size);
3348
3349	if (ev == NULL)
3350		return -ENOMEM;
3351
3352	ev->attr.attr = *attr;
3353	memcpy(ev->attr.id, id, ids * sizeof(u64));
3354
3355	ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
3356	ev->attr.header.size = (u16)size;
3357
3358	if (ev->attr.header.size == size)
3359		err = process(tool, ev, NULL, NULL);
3360	else
3361		err = -E2BIG;
3362
3363	free(ev);
3364
3365	return err;
3366}
3367
3368int perf_event__synthesize_features(struct perf_tool *tool,
3369				    struct perf_session *session,
3370				    struct perf_evlist *evlist,
3371				    perf_event__handler_t process)
3372{
3373	struct perf_header *header = &session->header;
3374	struct feat_fd ff;
3375	struct feature_event *fe;
3376	size_t sz, sz_hdr;
3377	int feat, ret;
3378
3379	sz_hdr = sizeof(fe->header);
3380	sz = sizeof(union perf_event);
3381	/* get a nice alignment */
3382	sz = PERF_ALIGN(sz, page_size);
3383
3384	memset(&ff, 0, sizeof(ff));
3385
3386	ff.buf = malloc(sz);
3387	if (!ff.buf)
3388		return -ENOMEM;
3389
3390	ff.size = sz - sz_hdr;
3391
3392	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
3393		if (!feat_ops[feat].synthesize) {
3394			pr_debug("No record header feature for header :%d\n", feat);
3395			continue;
3396		}
3397
3398		ff.offset = sizeof(*fe);
3399
3400		ret = feat_ops[feat].write(&ff, evlist);
3401		if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
3402			pr_debug("Error writing feature\n");
3403			continue;
3404		}
3405		/* ff.buf may have changed due to realloc in do_write() */
3406		fe = ff.buf;
3407		memset(fe, 0, sizeof(*fe));
3408
3409		fe->feat_id = feat;
3410		fe->header.type = PERF_RECORD_HEADER_FEATURE;
3411		fe->header.size = ff.offset;
3412
3413		ret = process(tool, ff.buf, NULL, NULL);
3414		if (ret) {
3415			free(ff.buf);
3416			return ret;
3417		}
3418	}
3419
3420	/* Send HEADER_LAST_FEATURE mark. */
3421	fe = ff.buf;
3422	fe->feat_id     = HEADER_LAST_FEATURE;
3423	fe->header.type = PERF_RECORD_HEADER_FEATURE;
3424	fe->header.size = sizeof(*fe);
3425
3426	ret = process(tool, ff.buf, NULL, NULL);
3427
3428	free(ff.buf);
3429	return ret;
3430}
3431
3432int perf_event__process_feature(struct perf_tool *tool,
3433				union perf_event *event,
3434				struct perf_session *session __maybe_unused)
3435{
3436	struct feat_fd ff = { .fd = 0 };
3437	struct feature_event *fe = (struct feature_event *)event;
3438	int type = fe->header.type;
3439	u64 feat = fe->feat_id;
3440
3441	if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {
3442		pr_warning("invalid record type %d in pipe-mode\n", type);
3443		return 0;
3444	}
3445	if (feat == HEADER_RESERVED || feat > HEADER_LAST_FEATURE) {
3446		pr_warning("invalid record type %d in pipe-mode\n", type);
3447		return -1;
3448	}
3449
3450	if (!feat_ops[feat].process)
3451		return 0;
3452
3453	ff.buf  = (void *)fe->data;
3454	ff.size = event->header.size - sizeof(event->header);
3455	ff.ph = &session->header;
3456
3457	if (feat_ops[feat].process(&ff, NULL))
3458		return -1;
3459
3460	if (!feat_ops[feat].print || !tool->show_feat_hdr)
3461		return 0;
3462
3463	if (!feat_ops[feat].full_only ||
3464	    tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {
3465		feat_ops[feat].print(&ff, stdout);
3466	} else {
3467		fprintf(stdout, "# %s info available, use -I to display\n",
3468			feat_ops[feat].name);
3469	}
3470
3471	return 0;
3472}
3473
3474static struct event_update_event *
3475event_update_event__new(size_t size, u64 type, u64 id)
3476{
3477	struct event_update_event *ev;
3478
3479	size += sizeof(*ev);
3480	size  = PERF_ALIGN(size, sizeof(u64));
3481
3482	ev = zalloc(size);
3483	if (ev) {
3484		ev->header.type = PERF_RECORD_EVENT_UPDATE;
3485		ev->header.size = (u16)size;
3486		ev->type = type;
3487		ev->id = id;
3488	}
3489	return ev;
3490}
3491
3492int
3493perf_event__synthesize_event_update_unit(struct perf_tool *tool,
3494					 struct perf_evsel *evsel,
3495					 perf_event__handler_t process)
3496{
3497	struct event_update_event *ev;
3498	size_t size = strlen(evsel->unit);
3499	int err;
3500
3501	ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
3502	if (ev == NULL)
3503		return -ENOMEM;
3504
3505	strncpy(ev->data, evsel->unit, size);
3506	err = process(tool, (union perf_event *)ev, NULL, NULL);
3507	free(ev);
3508	return err;
3509}
3510
3511int
3512perf_event__synthesize_event_update_scale(struct perf_tool *tool,
3513					  struct perf_evsel *evsel,
3514					  perf_event__handler_t process)
3515{
3516	struct event_update_event *ev;
3517	struct event_update_event_scale *ev_data;
3518	int err;
3519
3520	ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->id[0]);
3521	if (ev == NULL)
3522		return -ENOMEM;
3523
3524	ev_data = (struct event_update_event_scale *) ev->data;
3525	ev_data->scale = evsel->scale;
3526	err = process(tool, (union perf_event*) ev, NULL, NULL);
3527	free(ev);
3528	return err;
3529}
3530
3531int
3532perf_event__synthesize_event_update_name(struct perf_tool *tool,
3533					 struct perf_evsel *evsel,
3534					 perf_event__handler_t process)
3535{
3536	struct event_update_event *ev;
3537	size_t len = strlen(evsel->name);
3538	int err;
3539
3540	ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->id[0]);
3541	if (ev == NULL)
3542		return -ENOMEM;
3543
3544	strncpy(ev->data, evsel->name, len);
3545	err = process(tool, (union perf_event*) ev, NULL, NULL);
3546	free(ev);
3547	return err;
3548}
3549
3550int
3551perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
3552					struct perf_evsel *evsel,
3553					perf_event__handler_t process)
3554{
3555	size_t size = sizeof(struct event_update_event);
3556	struct event_update_event *ev;
3557	int max, err;
3558	u16 type;
3559
3560	if (!evsel->own_cpus)
3561		return 0;
3562
3563	ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
3564	if (!ev)
3565		return -ENOMEM;
3566
3567	ev->header.type = PERF_RECORD_EVENT_UPDATE;
3568	ev->header.size = (u16)size;
3569	ev->type = PERF_EVENT_UPDATE__CPUS;
3570	ev->id   = evsel->id[0];
3571
3572	cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
3573				 evsel->own_cpus,
3574				 type, max);
3575
3576	err = process(tool, (union perf_event*) ev, NULL, NULL);
3577	free(ev);
3578	return err;
3579}
3580
3581size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
3582{
3583	struct event_update_event *ev = &event->event_update;
3584	struct event_update_event_scale *ev_scale;
3585	struct event_update_event_cpus *ev_cpus;
3586	struct cpu_map *map;
3587	size_t ret;
3588
3589	ret = fprintf(fp, "\n... id:    %" PRIu64 "\n", ev->id);
3590
3591	switch (ev->type) {
3592	case PERF_EVENT_UPDATE__SCALE:
3593		ev_scale = (struct event_update_event_scale *) ev->data;
3594		ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
3595		break;
3596	case PERF_EVENT_UPDATE__UNIT:
3597		ret += fprintf(fp, "... unit:  %s\n", ev->data);
3598		break;
3599	case PERF_EVENT_UPDATE__NAME:
3600		ret += fprintf(fp, "... name:  %s\n", ev->data);
3601		break;
3602	case PERF_EVENT_UPDATE__CPUS:
3603		ev_cpus = (struct event_update_event_cpus *) ev->data;
3604		ret += fprintf(fp, "... ");
3605
3606		map = cpu_map__new_data(&ev_cpus->cpus);
3607		if (map)
3608			ret += cpu_map__fprintf(map, fp);
3609		else
3610			ret += fprintf(fp, "failed to get cpus\n");
3611		break;
3612	default:
3613		ret += fprintf(fp, "... unknown type\n");
3614		break;
3615	}
3616
3617	return ret;
3618}
3619
3620int perf_event__synthesize_attrs(struct perf_tool *tool,
3621				   struct perf_session *session,
3622				   perf_event__handler_t process)
3623{
3624	struct perf_evsel *evsel;
3625	int err = 0;
3626
3627	evlist__for_each_entry(session->evlist, evsel) {
3628		err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
3629						  evsel->id, process);
3630		if (err) {
3631			pr_debug("failed to create perf header attribute\n");
3632			return err;
3633		}
3634	}
3635
3636	return err;
3637}
3638
3639static bool has_unit(struct perf_evsel *counter)
3640{
3641	return counter->unit && *counter->unit;
3642}
3643
3644static bool has_scale(struct perf_evsel *counter)
3645{
3646	return counter->scale != 1;
3647}
3648
3649int perf_event__synthesize_extra_attr(struct perf_tool *tool,
3650				      struct perf_evlist *evsel_list,
3651				      perf_event__handler_t process,
3652				      bool is_pipe)
3653{
3654	struct perf_evsel *counter;
3655	int err;
3656
3657	/*
3658	 * Synthesize other events stuff not carried within
3659	 * attr event - unit, scale, name
3660	 */
3661	evlist__for_each_entry(evsel_list, counter) {
3662		if (!counter->supported)
3663			continue;
3664
3665		/*
3666		 * Synthesize unit and scale only if it's defined.
3667		 */
3668		if (has_unit(counter)) {
3669			err = perf_event__synthesize_event_update_unit(tool, counter, process);
3670			if (err < 0) {
3671				pr_err("Couldn't synthesize evsel unit.\n");
3672				return err;
3673			}
3674		}
3675
3676		if (has_scale(counter)) {
3677			err = perf_event__synthesize_event_update_scale(tool, counter, process);
3678			if (err < 0) {
3679				pr_err("Couldn't synthesize evsel counter.\n");
3680				return err;
3681			}
3682		}
3683
3684		if (counter->own_cpus) {
3685			err = perf_event__synthesize_event_update_cpus(tool, counter, process);
3686			if (err < 0) {
3687				pr_err("Couldn't synthesize evsel cpus.\n");
3688				return err;
3689			}
3690		}
3691
3692		/*
3693		 * Name is needed only for pipe output,
3694		 * perf.data carries event names.
3695		 */
3696		if (is_pipe) {
3697			err = perf_event__synthesize_event_update_name(tool, counter, process);
3698			if (err < 0) {
3699				pr_err("Couldn't synthesize evsel name.\n");
3700				return err;
3701			}
3702		}
3703	}
3704	return 0;
3705}
3706
3707int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
3708			     union perf_event *event,
3709			     struct perf_evlist **pevlist)
3710{
3711	u32 i, ids, n_ids;
3712	struct perf_evsel *evsel;
3713	struct perf_evlist *evlist = *pevlist;
3714
3715	if (evlist == NULL) {
3716		*pevlist = evlist = perf_evlist__new();
3717		if (evlist == NULL)
3718			return -ENOMEM;
3719	}
3720
3721	evsel = perf_evsel__new(&event->attr.attr);
3722	if (evsel == NULL)
3723		return -ENOMEM;
3724
3725	perf_evlist__add(evlist, evsel);
3726
3727	ids = event->header.size;
3728	ids -= (void *)&event->attr.id - (void *)event;
3729	n_ids = ids / sizeof(u64);
3730	/*
3731	 * We don't have the cpu and thread maps on the header, so
3732	 * for allocating the perf_sample_id table we fake 1 cpu and
3733	 * hattr->ids threads.
3734	 */
3735	if (perf_evsel__alloc_id(evsel, 1, n_ids))
3736		return -ENOMEM;
3737
3738	for (i = 0; i < n_ids; i++) {
3739		perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3740	}
3741
3742	symbol_conf.nr_events = evlist->nr_entries;
3743
3744	return 0;
3745}
3746
3747int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
3748				     union perf_event *event,
3749				     struct perf_evlist **pevlist)
 
3750{
3751	struct event_update_event *ev = &event->event_update;
3752	struct event_update_event_scale *ev_scale;
3753	struct event_update_event_cpus *ev_cpus;
3754	struct perf_evlist *evlist;
3755	struct perf_evsel *evsel;
3756	struct cpu_map *map;
3757
3758	if (!pevlist || *pevlist == NULL)
3759		return -EINVAL;
3760
3761	evlist = *pevlist;
 
 
 
 
 
 
 
 
3762
3763	evsel = perf_evlist__id2evsel(evlist, ev->id);
3764	if (evsel == NULL)
3765		return -EINVAL;
3766
3767	switch (ev->type) {
3768	case PERF_EVENT_UPDATE__UNIT:
3769		evsel->unit = strdup(ev->data);
3770		break;
3771	case PERF_EVENT_UPDATE__NAME:
3772		evsel->name = strdup(ev->data);
3773		break;
3774	case PERF_EVENT_UPDATE__SCALE:
3775		ev_scale = (struct event_update_event_scale *) ev->data;
3776		evsel->scale = ev_scale->scale;
3777		break;
3778	case PERF_EVENT_UPDATE__CPUS:
3779		ev_cpus = (struct event_update_event_cpus *) ev->data;
3780
3781		map = cpu_map__new_data(&ev_cpus->cpus);
3782		if (map)
3783			evsel->own_cpus = map;
3784		else
3785			pr_err("failed to get event_update cpus\n");
3786	default:
3787		break;
 
 
 
 
 
 
 
 
 
 
3788	}
3789
 
 
 
 
 
 
 
 
 
 
3790	return 0;
3791}
3792
3793int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3794					struct perf_evlist *evlist,
3795					perf_event__handler_t process)
3796{
3797	union perf_event ev;
3798	struct tracing_data *tdata;
3799	ssize_t size = 0, aligned_size = 0, padding;
3800	struct feat_fd ff;
3801	int err __maybe_unused = 0;
3802
3803	/*
3804	 * We are going to store the size of the data followed
3805	 * by the data contents. Since the fd descriptor is a pipe,
3806	 * we cannot seek back to store the size of the data once
3807	 * we know it. Instead we:
3808	 *
3809	 * - write the tracing data to the temp file
3810	 * - get/write the data size to pipe
3811	 * - write the tracing data from the temp file
3812	 *   to the pipe
3813	 */
3814	tdata = tracing_data_get(&evlist->entries, fd, true);
3815	if (!tdata)
3816		return -1;
3817
3818	memset(&ev, 0, sizeof(ev));
3819
3820	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3821	size = tdata->size;
3822	aligned_size = PERF_ALIGN(size, sizeof(u64));
3823	padding = aligned_size - size;
3824	ev.tracing_data.header.size = sizeof(ev.tracing_data);
3825	ev.tracing_data.size = aligned_size;
3826
3827	process(tool, &ev, NULL, NULL);
3828
3829	/*
3830	 * The put function will copy all the tracing data
3831	 * stored in temp file to the pipe.
3832	 */
3833	tracing_data_put(tdata);
3834
3835	ff = (struct feat_fd){ .fd = fd };
3836	if (write_padded(&ff, NULL, 0, padding))
3837		return -1;
3838
3839	return aligned_size;
3840}
3841
3842int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
3843				     union perf_event *event,
3844				     struct perf_session *session)
3845{
3846	ssize_t size_read, padding, size = event->tracing_data.size;
3847	int fd = perf_data__fd(session->data);
3848	off_t offset = lseek(fd, 0, SEEK_CUR);
3849	char buf[BUFSIZ];
3850
3851	/* setup for reading amidst mmap */
3852	lseek(fd, offset + sizeof(struct tracing_data_event),
3853	      SEEK_SET);
3854
3855	size_read = trace_report(fd, &session->tevent,
3856				 session->repipe);
3857	padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3858
3859	if (readn(fd, buf, padding) < 0) {
3860		pr_err("%s: reading input file", __func__);
3861		return -1;
3862	}
3863	if (session->repipe) {
3864		int retw = write(STDOUT_FILENO, buf, padding);
3865		if (retw <= 0 || retw != padding) {
3866			pr_err("%s: repiping tracing data padding", __func__);
3867			return -1;
3868		}
3869	}
3870
3871	if (size_read + padding != size) {
3872		pr_err("%s: tracing data size mismatch", __func__);
3873		return -1;
3874	}
3875
3876	perf_evlist__prepare_tracepoint_events(session->evlist,
3877					       session->tevent.pevent);
3878
3879	return size_read + padding;
3880}
3881
3882int perf_event__synthesize_build_id(struct perf_tool *tool,
3883				    struct dso *pos, u16 misc,
3884				    perf_event__handler_t process,
3885				    struct machine *machine)
3886{
3887	union perf_event ev;
3888	size_t len;
3889	int err = 0;
3890
3891	if (!pos->hit)
3892		return err;
3893
3894	memset(&ev, 0, sizeof(ev));
3895
3896	len = pos->long_name_len + 1;
3897	len = PERF_ALIGN(len, NAME_ALIGN);
3898	memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3899	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3900	ev.build_id.header.misc = misc;
3901	ev.build_id.pid = machine->pid;
3902	ev.build_id.header.size = sizeof(ev.build_id) + len;
3903	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3904
3905	err = process(tool, &ev, NULL, machine);
3906
3907	return err;
3908}
3909
3910int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
3911				 union perf_event *event,
3912				 struct perf_session *session)
3913{
3914	__event_process_build_id(&event->build_id,
3915				 event->build_id.filename,
3916				 session);
3917	return 0;
 
 
 
 
 
3918}