header.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <errno.h>
   3#include <inttypes.h>
   4#include "string2.h"
   5#include <sys/param.h>
   6#include <sys/types.h>
   7#include <byteswap.h>
   8#include <unistd.h>
   9#include <regex.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/string.h>
  17#include <linux/stringify.h>
  18#include <linux/zalloc.h>
  19#include <sys/stat.h>
  20#include <sys/utsname.h>
  21#include <linux/time64.h>
  22#include <dirent.h>
  23#ifdef HAVE_LIBBPF_SUPPORT
  24#include <bpf/libbpf.h>
  25#endif
  26#include <perf/cpumap.h>
  27#include <tools/libc_compat.h> // reallocarray
  28
  29#include "dso.h"
  30#include "evlist.h"
  31#include "evsel.h"
  32#include "util/evsel_fprintf.h"
  33#include "header.h"
  34#include "memswap.h"
  35#include "trace-event.h"
  36#include "session.h"
  37#include "symbol.h"
  38#include "debug.h"
  39#include "cpumap.h"
  40#include "pmu.h"
  41#include "pmus.h"
  42#include "vdso.h"
  43#include "strbuf.h"
  44#include "build-id.h"
  45#include "data.h"
  46#include <api/fs/fs.h>
  47#include <api/io_dir.h>
  48#include "asm/bug.h"
  49#include "tool.h"
  50#include "time-utils.h"
  51#include "units.h"
  52#include "util/util.h" // perf_exe()
  53#include "cputopo.h"
  54#include "bpf-event.h"
  55#include "bpf-utils.h"
  56#include "clockid.h"
  57
  58#include <linux/ctype.h>
  59#include <internal/lib.h>
  60
  61#ifdef HAVE_LIBTRACEEVENT
  62#include <event-parse.h>
  63#endif
  64
  65/*
  66 * magic2 = "PERFILE2"
  67 * must be a numerical value to let the endianness
  68 * determine the memory layout. That way we are able
  69 * to detect endianness when reading the perf.data file
  70 * back.
  71 *
  72 * we check for legacy (PERFFILE) format.
  73 */
  74static const char *__perf_magic1 = "PERFFILE";
  75static const u64 __perf_magic2    = 0x32454c4946524550ULL;
  76static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
  77
  78#define PERF_MAGIC	__perf_magic2
  79
  80const char perf_version_string[] = PERF_VERSION;
  81
  82struct perf_file_attr {
  83	struct perf_event_attr	attr;
  84	struct perf_file_section	ids;
  85};
  86
  87void perf_header__set_feat(struct perf_header *header, int feat)
  88{
  89	__set_bit(feat, header->adds_features);
  90}
  91
  92void perf_header__clear_feat(struct perf_header *header, int feat)
  93{
  94	__clear_bit(feat, header->adds_features);
  95}
  96
  97bool perf_header__has_feat(const struct perf_header *header, int feat)
  98{
  99	return test_bit(feat, header->adds_features);
 100}
 101
 102static int __do_write_fd(struct feat_fd *ff, const void *buf, size_t size)
 103{
 104	ssize_t ret = writen(ff->fd, buf, size);
 105
 106	if (ret != (ssize_t)size)
 107		return ret < 0 ? (int)ret : -1;
 108	return 0;
 109}
 110
 111static int __do_write_buf(struct feat_fd *ff,  const void *buf, size_t size)
 112{
 113	/* struct perf_event_header::size is u16 */
 114	const size_t max_size = 0xffff - sizeof(struct perf_event_header);
 115	size_t new_size = ff->size;
 116	void *addr;
 117
 118	if (size + ff->offset > max_size)
 119		return -E2BIG;
 120
 121	while (size > (new_size - ff->offset))
 122		new_size <<= 1;
 123	new_size = min(max_size, new_size);
 124
 125	if (ff->size < new_size) {
 126		addr = realloc(ff->buf, new_size);
 127		if (!addr)
 128			return -ENOMEM;
 129		ff->buf = addr;
 130		ff->size = new_size;
 131	}
 132
 133	memcpy(ff->buf + ff->offset, buf, size);
 134	ff->offset += size;
 135
 136	return 0;
 137}
 138
 139/* Return: 0 if succeeded, -ERR if failed. */
 140int do_write(struct feat_fd *ff, const void *buf, size_t size)
 141{
 142	if (!ff->buf)
 143		return __do_write_fd(ff, buf, size);
 144	return __do_write_buf(ff, buf, size);
 145}
 146
 147/* Return: 0 if succeeded, -ERR if failed. */
 148static int do_write_bitmap(struct feat_fd *ff, unsigned long *set, u64 size)
 149{
 150	u64 *p = (u64 *) set;
 151	int i, ret;
 152
 153	ret = do_write(ff, &size, sizeof(size));
 154	if (ret < 0)
 155		return ret;
 156
 157	for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
 158		ret = do_write(ff, p + i, sizeof(*p));
 159		if (ret < 0)
 160			return ret;
 161	}
 162
 163	return 0;
 164}
 165
 166/* Return: 0 if succeeded, -ERR if failed. */
 167int write_padded(struct feat_fd *ff, const void *bf,
 168		 size_t count, size_t count_aligned)
 169{
 170	static const char zero_buf[NAME_ALIGN];
 171	int err = do_write(ff, bf, count);
 172
 173	if (!err)
 174		err = do_write(ff, zero_buf, count_aligned - count);
 175
 176	return err;
 177}
 178
 179#define string_size(str)						\
 180	(PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
 181
 182/* Return: 0 if succeeded, -ERR if failed. */
 183static int do_write_string(struct feat_fd *ff, const char *str)
 184{
 185	u32 len, olen;
 186	int ret;
 187
 188	olen = strlen(str) + 1;
 189	len = PERF_ALIGN(olen, NAME_ALIGN);
 190
 191	/* write len, incl. \0 */
 192	ret = do_write(ff, &len, sizeof(len));
 193	if (ret < 0)
 194		return ret;
 195
 196	return write_padded(ff, str, olen, len);
 197}
 198
 199static int __do_read_fd(struct feat_fd *ff, void *addr, ssize_t size)
 200{
 201	ssize_t ret = readn(ff->fd, addr, size);
 202
 203	if (ret != size)
 204		return ret < 0 ? (int)ret : -1;
 205	return 0;
 206}
 207
 208static int __do_read_buf(struct feat_fd *ff, void *addr, ssize_t size)
 209{
 210	if (size > (ssize_t)ff->size - ff->offset)
 211		return -1;
 212
 213	memcpy(addr, ff->buf + ff->offset, size);
 214	ff->offset += size;
 215
 216	return 0;
 217
 218}
 219
 220static int __do_read(struct feat_fd *ff, void *addr, ssize_t size)
 221{
 222	if (!ff->buf)
 223		return __do_read_fd(ff, addr, size);
 224	return __do_read_buf(ff, addr, size);
 225}
 226
 227static int do_read_u32(struct feat_fd *ff, u32 *addr)
 228{
 229	int ret;
 230
 231	ret = __do_read(ff, addr, sizeof(*addr));
 232	if (ret)
 233		return ret;
 234
 235	if (ff->ph->needs_swap)
 236		*addr = bswap_32(*addr);
 237	return 0;
 238}
 239
 240static int do_read_u64(struct feat_fd *ff, u64 *addr)
 241{
 242	int ret;
 243
 244	ret = __do_read(ff, addr, sizeof(*addr));
 245	if (ret)
 246		return ret;
 247
 248	if (ff->ph->needs_swap)
 249		*addr = bswap_64(*addr);
 250	return 0;
 251}
 252
 253static char *do_read_string(struct feat_fd *ff)
 254{
 255	u32 len;
 256	char *buf;
 257
 258	if (do_read_u32(ff, &len))
 259		return NULL;
 260
 261	buf = malloc(len);
 262	if (!buf)
 263		return NULL;
 264
 265	if (!__do_read(ff, buf, len)) {
 266		/*
 267		 * strings are padded by zeroes
 268		 * thus the actual strlen of buf
 269		 * may be less than len
 270		 */
 271		return buf;
 272	}
 273
 274	free(buf);
 275	return NULL;
 276}
 277
 278/* Return: 0 if succeeded, -ERR if failed. */
 279static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
 280{
 281	unsigned long *set;
 282	u64 size, *p;
 283	int i, ret;
 284
 285	ret = do_read_u64(ff, &size);
 286	if (ret)
 287		return ret;
 288
 289	set = bitmap_zalloc(size);
 290	if (!set)
 291		return -ENOMEM;
 292
 293	p = (u64 *) set;
 294
 295	for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
 296		ret = do_read_u64(ff, p + i);
 297		if (ret < 0) {
 298			free(set);
 299			return ret;
 300		}
 301	}
 302
 303	*pset  = set;
 304	*psize = size;
 305	return 0;
 306}
 307
 308#ifdef HAVE_LIBTRACEEVENT
 309static int write_tracing_data(struct feat_fd *ff,
 310			      struct evlist *evlist)
 311{
 312	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
 313		return -1;
 314
 315	return read_tracing_data(ff->fd, &evlist->core.entries);
 316}
 317#endif
 318
 319static int write_build_id(struct feat_fd *ff,
 320			  struct evlist *evlist __maybe_unused)
 321{
 322	struct perf_session *session;
 323	int err;
 324
 325	session = container_of(ff->ph, struct perf_session, header);
 326
 327	if (!perf_session__read_build_ids(session, true))
 328		return -1;
 329
 330	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
 331		return -1;
 332
 333	err = perf_session__write_buildid_table(session, ff);
 334	if (err < 0) {
 335		pr_debug("failed to write buildid table\n");
 336		return err;
 337	}
 338
 339	return 0;
 340}
 341
 342static int write_hostname(struct feat_fd *ff,
 343			  struct evlist *evlist __maybe_unused)
 344{
 345	struct utsname uts;
 346	int ret;
 347
 348	ret = uname(&uts);
 349	if (ret < 0)
 350		return -1;
 351
 352	return do_write_string(ff, uts.nodename);
 353}
 354
 355static int write_osrelease(struct feat_fd *ff,
 356			   struct evlist *evlist __maybe_unused)
 357{
 358	struct utsname uts;
 359	int ret;
 360
 361	ret = uname(&uts);
 362	if (ret < 0)
 363		return -1;
 364
 365	return do_write_string(ff, uts.release);
 366}
 367
 368static int write_arch(struct feat_fd *ff,
 369		      struct evlist *evlist __maybe_unused)
 370{
 371	struct utsname uts;
 372	int ret;
 373
 374	ret = uname(&uts);
 375	if (ret < 0)
 376		return -1;
 377
 378	return do_write_string(ff, uts.machine);
 379}
 380
 381static int write_version(struct feat_fd *ff,
 382			 struct evlist *evlist __maybe_unused)
 383{
 384	return do_write_string(ff, perf_version_string);
 385}
 386
 387static int __write_cpudesc(struct feat_fd *ff, const char *cpuinfo_proc)
 388{
 389	FILE *file;
 390	char *buf = NULL;
 391	char *s, *p;
 392	const char *search = cpuinfo_proc;
 393	size_t len = 0;
 394	int ret = -1;
 395
 396	if (!search)
 397		return -1;
 398
 399	file = fopen("/proc/cpuinfo", "r");
 400	if (!file)
 401		return -1;
 402
 403	while (getline(&buf, &len, file) > 0) {
 404		ret = strncmp(buf, search, strlen(search));
 405		if (!ret)
 406			break;
 407	}
 408
 409	if (ret) {
 410		ret = -1;
 411		goto done;
 412	}
 413
 414	s = buf;
 415
 416	p = strchr(buf, ':');
 417	if (p && *(p+1) == ' ' && *(p+2))
 418		s = p + 2;
 419	p = strchr(s, '\n');
 420	if (p)
 421		*p = '\0';
 422
 423	/* squash extra space characters (branding string) */
 424	p = s;
 425	while (*p) {
 426		if (isspace(*p)) {
 427			char *r = p + 1;
 428			char *q = skip_spaces(r);
 429			*p = ' ';
 430			if (q != (p+1))
 431				while ((*r++ = *q++));
 432		}
 433		p++;
 434	}
 435	ret = do_write_string(ff, s);
 436done:
 437	free(buf);
 438	fclose(file);
 439	return ret;
 440}
 441
 442static int write_cpudesc(struct feat_fd *ff,
 443		       struct evlist *evlist __maybe_unused)
 444{
 445#if defined(__powerpc__) || defined(__hppa__) || defined(__sparc__)
 446#define CPUINFO_PROC	{ "cpu", }
 447#elif defined(__s390__)
 448#define CPUINFO_PROC	{ "vendor_id", }
 449#elif defined(__sh__)
 450#define CPUINFO_PROC	{ "cpu type", }
 451#elif defined(__alpha__) || defined(__mips__)
 452#define CPUINFO_PROC	{ "cpu model", }
 453#elif defined(__arm__)
 454#define CPUINFO_PROC	{ "model name", "Processor", }
 455#elif defined(__arc__)
 456#define CPUINFO_PROC	{ "Processor", }
 457#elif defined(__xtensa__)
 458#define CPUINFO_PROC	{ "core ID", }
 459#elif defined(__loongarch__)
 460#define CPUINFO_PROC	{ "Model Name", }
 461#else
 462#define CPUINFO_PROC	{ "model name", }
 463#endif
 464	const char *cpuinfo_procs[] = CPUINFO_PROC;
 465#undef CPUINFO_PROC
 466	unsigned int i;
 467
 468	for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
 469		int ret;
 470		ret = __write_cpudesc(ff, cpuinfo_procs[i]);
 471		if (ret >= 0)
 472			return ret;
 473	}
 474	return -1;
 475}
 476
 477
 478static int write_nrcpus(struct feat_fd *ff,
 479			struct evlist *evlist __maybe_unused)
 480{
 481	long nr;
 482	u32 nrc, nra;
 483	int ret;
 484
 485	nrc = cpu__max_present_cpu().cpu;
 486
 487	nr = sysconf(_SC_NPROCESSORS_ONLN);
 488	if (nr < 0)
 489		return -1;
 490
 491	nra = (u32)(nr & UINT_MAX);
 492
 493	ret = do_write(ff, &nrc, sizeof(nrc));
 494	if (ret < 0)
 495		return ret;
 496
 497	return do_write(ff, &nra, sizeof(nra));
 498}
 499
 500static int write_event_desc(struct feat_fd *ff,
 501			    struct evlist *evlist)
 502{
 503	struct evsel *evsel;
 504	u32 nre, nri, sz;
 505	int ret;
 506
 507	nre = evlist->core.nr_entries;
 508
 509	/*
 510	 * write number of events
 511	 */
 512	ret = do_write(ff, &nre, sizeof(nre));
 513	if (ret < 0)
 514		return ret;
 515
 516	/*
 517	 * size of perf_event_attr struct
 518	 */
 519	sz = (u32)sizeof(evsel->core.attr);
 520	ret = do_write(ff, &sz, sizeof(sz));
 521	if (ret < 0)
 522		return ret;
 523
 524	evlist__for_each_entry(evlist, evsel) {
 525		ret = do_write(ff, &evsel->core.attr, sz);
 526		if (ret < 0)
 527			return ret;
 528		/*
 529		 * write number of unique id per event
 530		 * there is one id per instance of an event
 531		 *
 532		 * copy into an nri to be independent of the
 533		 * type of ids,
 534		 */
 535		nri = evsel->core.ids;
 536		ret = do_write(ff, &nri, sizeof(nri));
 537		if (ret < 0)
 538			return ret;
 539
 540		/*
 541		 * write event string as passed on cmdline
 542		 */
 543		ret = do_write_string(ff, evsel__name(evsel));
 544		if (ret < 0)
 545			return ret;
 546		/*
 547		 * write unique ids for this event
 548		 */
 549		ret = do_write(ff, evsel->core.id, evsel->core.ids * sizeof(u64));
 550		if (ret < 0)
 551			return ret;
 552	}
 553	return 0;
 554}
 555
 556static int write_cmdline(struct feat_fd *ff,
 557			 struct evlist *evlist __maybe_unused)
 558{
 559	struct perf_env *env = &ff->ph->env;
 560	char pbuf[MAXPATHLEN], *buf;
 561	int i, ret, n;
 562
 563	/* actual path to perf binary */
 564	buf = perf_exe(pbuf, MAXPATHLEN);
 565
 566	/* account for binary path */
 567	n = env->nr_cmdline + 1;
 568
 569	ret = do_write(ff, &n, sizeof(n));
 570	if (ret < 0)
 571		return ret;
 572
 573	ret = do_write_string(ff, buf);
 574	if (ret < 0)
 575		return ret;
 576
 577	for (i = 0 ; i < env->nr_cmdline; i++) {
 578		ret = do_write_string(ff, env->cmdline_argv[i]);
 579		if (ret < 0)
 580			return ret;
 581	}
 582	return 0;
 583}
 584
 585
 586static int write_cpu_topology(struct feat_fd *ff,
 587			      struct evlist *evlist __maybe_unused)
 588{
 589	struct perf_env *env = &ff->ph->env;
 590	struct cpu_topology *tp;
 591	u32 i;
 592	int ret, j;
 593
 594	tp = cpu_topology__new();
 595	if (!tp)
 596		return -1;
 597
 598	ret = do_write(ff, &tp->package_cpus_lists, sizeof(tp->package_cpus_lists));
 599	if (ret < 0)
 600		goto done;
 601
 602	for (i = 0; i < tp->package_cpus_lists; i++) {
 603		ret = do_write_string(ff, tp->package_cpus_list[i]);
 604		if (ret < 0)
 605			goto done;
 606	}
 607	ret = do_write(ff, &tp->core_cpus_lists, sizeof(tp->core_cpus_lists));
 608	if (ret < 0)
 609		goto done;
 610
 611	for (i = 0; i < tp->core_cpus_lists; i++) {
 612		ret = do_write_string(ff, tp->core_cpus_list[i]);
 613		if (ret < 0)
 614			break;
 615	}
 616
 617	ret = perf_env__read_cpu_topology_map(env);
 618	if (ret < 0)
 619		goto done;
 620
 621	for (j = 0; j < env->nr_cpus_avail; j++) {
 622		ret = do_write(ff, &env->cpu[j].core_id,
 623			       sizeof(env->cpu[j].core_id));
 624		if (ret < 0)
 625			return ret;
 626		ret = do_write(ff, &env->cpu[j].socket_id,
 627			       sizeof(env->cpu[j].socket_id));
 628		if (ret < 0)
 629			return ret;
 630	}
 631
 632	if (!tp->die_cpus_lists)
 633		goto done;
 634
 635	ret = do_write(ff, &tp->die_cpus_lists, sizeof(tp->die_cpus_lists));
 636	if (ret < 0)
 637		goto done;
 638
 639	for (i = 0; i < tp->die_cpus_lists; i++) {
 640		ret = do_write_string(ff, tp->die_cpus_list[i]);
 641		if (ret < 0)
 642			goto done;
 643	}
 644
 645	for (j = 0; j < env->nr_cpus_avail; j++) {
 646		ret = do_write(ff, &env->cpu[j].die_id,
 647			       sizeof(env->cpu[j].die_id));
 648		if (ret < 0)
 649			return ret;
 650	}
 651
 652done:
 653	cpu_topology__delete(tp);
 654	return ret;
 655}
 656
 657
 658
 659static int write_total_mem(struct feat_fd *ff,
 660			   struct evlist *evlist __maybe_unused)
 661{
 662	char *buf = NULL;
 663	FILE *fp;
 664	size_t len = 0;
 665	int ret = -1, n;
 666	uint64_t mem;
 667
 668	fp = fopen("/proc/meminfo", "r");
 669	if (!fp)
 670		return -1;
 671
 672	while (getline(&buf, &len, fp) > 0) {
 673		ret = strncmp(buf, "MemTotal:", 9);
 674		if (!ret)
 675			break;
 676	}
 677	if (!ret) {
 678		n = sscanf(buf, "%*s %"PRIu64, &mem);
 679		if (n == 1)
 680			ret = do_write(ff, &mem, sizeof(mem));
 681	} else
 682		ret = -1;
 683	free(buf);
 684	fclose(fp);
 685	return ret;
 686}
 687
 688static int write_numa_topology(struct feat_fd *ff,
 689			       struct evlist *evlist __maybe_unused)
 690{
 691	struct numa_topology *tp;
 692	int ret = -1;
 693	u32 i;
 694
 695	tp = numa_topology__new();
 696	if (!tp)
 697		return -ENOMEM;
 698
 699	ret = do_write(ff, &tp->nr, sizeof(u32));
 700	if (ret < 0)
 701		goto err;
 702
 703	for (i = 0; i < tp->nr; i++) {
 704		struct numa_topology_node *n = &tp->nodes[i];
 705
 706		ret = do_write(ff, &n->node, sizeof(u32));
 707		if (ret < 0)
 708			goto err;
 709
 710		ret = do_write(ff, &n->mem_total, sizeof(u64));
 711		if (ret)
 712			goto err;
 713
 714		ret = do_write(ff, &n->mem_free, sizeof(u64));
 715		if (ret)
 716			goto err;
 717
 718		ret = do_write_string(ff, n->cpus);
 719		if (ret < 0)
 720			goto err;
 721	}
 722
 723	ret = 0;
 724
 725err:
 726	numa_topology__delete(tp);
 727	return ret;
 728}
 729
 730/*
 731 * File format:
 732 *
 733 * struct pmu_mappings {
 734 *	u32	pmu_num;
 735 *	struct pmu_map {
 736 *		u32	type;
 737 *		char	name[];
 738 *	}[pmu_num];
 739 * };
 740 */
 741
 742static int write_pmu_mappings(struct feat_fd *ff,
 743			      struct evlist *evlist __maybe_unused)
 744{
 745	struct perf_pmu *pmu = NULL;
 746	u32 pmu_num = 0;
 747	int ret;
 748
 749	/*
 750	 * Do a first pass to count number of pmu to avoid lseek so this
 751	 * works in pipe mode as well.
 752	 */
 753	while ((pmu = perf_pmus__scan(pmu)))
 754		pmu_num++;
 755
 756	ret = do_write(ff, &pmu_num, sizeof(pmu_num));
 757	if (ret < 0)
 758		return ret;
 759
 760	while ((pmu = perf_pmus__scan(pmu))) {
 761		ret = do_write(ff, &pmu->type, sizeof(pmu->type));
 762		if (ret < 0)
 763			return ret;
 764
 765		ret = do_write_string(ff, pmu->name);
 766		if (ret < 0)
 767			return ret;
 768	}
 769
 770	return 0;
 771}
 772
 773/*
 774 * File format:
 775 *
 776 * struct group_descs {
 777 *	u32	nr_groups;
 778 *	struct group_desc {
 779 *		char	name[];
 780 *		u32	leader_idx;
 781 *		u32	nr_members;
 782 *	}[nr_groups];
 783 * };
 784 */
 785static int write_group_desc(struct feat_fd *ff,
 786			    struct evlist *evlist)
 787{
 788	u32 nr_groups = evlist__nr_groups(evlist);
 789	struct evsel *evsel;
 790	int ret;
 791
 792	ret = do_write(ff, &nr_groups, sizeof(nr_groups));
 793	if (ret < 0)
 794		return ret;
 795
 796	evlist__for_each_entry(evlist, evsel) {
 797		if (evsel__is_group_leader(evsel) && evsel->core.nr_members > 1) {
 798			const char *name = evsel->group_name ?: "{anon_group}";
 799			u32 leader_idx = evsel->core.idx;
 800			u32 nr_members = evsel->core.nr_members;
 801
 802			ret = do_write_string(ff, name);
 803			if (ret < 0)
 804				return ret;
 805
 806			ret = do_write(ff, &leader_idx, sizeof(leader_idx));
 807			if (ret < 0)
 808				return ret;
 809
 810			ret = do_write(ff, &nr_members, sizeof(nr_members));
 811			if (ret < 0)
 812				return ret;
 813		}
 814	}
 815	return 0;
 816}
 817
 818/*
 819 * Return the CPU id as a raw string.
 820 *
 821 * Each architecture should provide a more precise id string that
 822 * can be use to match the architecture's "mapfile".
 823 */
 824char * __weak get_cpuid_str(struct perf_cpu cpu __maybe_unused)
 825{
 826	return NULL;
 827}
 828
 829char *get_cpuid_allow_env_override(struct perf_cpu cpu)
 830{
 831	char *cpuid;
 832	static bool printed;
 833
 834	cpuid = getenv("PERF_CPUID");
 835	if (cpuid)
 836		cpuid = strdup(cpuid);
 837	if (!cpuid)
 838		cpuid = get_cpuid_str(cpu);
 839	if (!cpuid)
 840		return NULL;
 841
 842	if (!printed) {
 843		pr_debug("Using CPUID %s\n", cpuid);
 844		printed = true;
 845	}
 846	return cpuid;
 847}
 848
 849/* Return zero when the cpuid from the mapfile.csv matches the
 850 * cpuid string generated on this platform.
 851 * Otherwise return non-zero.
 852 */
 853int __weak strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)
 854{
 855	regex_t re;
 856	regmatch_t pmatch[1];
 857	int match;
 858
 859	if (regcomp(&re, mapcpuid, REG_EXTENDED) != 0) {
 860		/* Warn unable to generate match particular string. */
 861		pr_info("Invalid regular expression %s\n", mapcpuid);
 862		return 1;
 863	}
 864
 865	match = !regexec(&re, cpuid, 1, pmatch, 0);
 866	regfree(&re);
 867	if (match) {
 868		size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);
 869
 870		/* Verify the entire string matched. */
 871		if (match_len == strlen(cpuid))
 872			return 0;
 873	}
 874	return 1;
 875}
 876
 877/*
 878 * default get_cpuid(): nothing gets recorded
 879 * actual implementation must be in arch/$(SRCARCH)/util/header.c
 880 */
 881int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused,
 882		     struct perf_cpu cpu __maybe_unused)
 883{
 884	return ENOSYS; /* Not implemented */
 885}
 886
 887static int write_cpuid(struct feat_fd *ff, struct evlist *evlist)
 888{
 889	struct perf_cpu cpu = perf_cpu_map__min(evlist->core.all_cpus);
 890	char buffer[64];
 891	int ret;
 892
 893	ret = get_cpuid(buffer, sizeof(buffer), cpu);
 894	if (ret)
 895		return -1;
 896
 897	return do_write_string(ff, buffer);
 898}
 899
 900static int write_branch_stack(struct feat_fd *ff __maybe_unused,
 901			      struct evlist *evlist __maybe_unused)
 902{
 903	return 0;
 904}
 905
 906static int write_auxtrace(struct feat_fd *ff,
 907			  struct evlist *evlist __maybe_unused)
 908{
 909	struct perf_session *session;
 910	int err;
 911
 912	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
 913		return -1;
 914
 915	session = container_of(ff->ph, struct perf_session, header);
 916
 917	err = auxtrace_index__write(ff->fd, &session->auxtrace_index);
 918	if (err < 0)
 919		pr_err("Failed to write auxtrace index\n");
 920	return err;
 921}
 922
 923static int write_clockid(struct feat_fd *ff,
 924			 struct evlist *evlist __maybe_unused)
 925{
 926	return do_write(ff, &ff->ph->env.clock.clockid_res_ns,
 927			sizeof(ff->ph->env.clock.clockid_res_ns));
 928}
 929
 930static int write_clock_data(struct feat_fd *ff,
 931			    struct evlist *evlist __maybe_unused)
 932{
 933	u64 *data64;
 934	u32 data32;
 935	int ret;
 936
 937	/* version */
 938	data32 = 1;
 939
 940	ret = do_write(ff, &data32, sizeof(data32));
 941	if (ret < 0)
 942		return ret;
 943
 944	/* clockid */
 945	data32 = ff->ph->env.clock.clockid;
 946
 947	ret = do_write(ff, &data32, sizeof(data32));
 948	if (ret < 0)
 949		return ret;
 950
 951	/* TOD ref time */
 952	data64 = &ff->ph->env.clock.tod_ns;
 953
 954	ret = do_write(ff, data64, sizeof(*data64));
 955	if (ret < 0)
 956		return ret;
 957
 958	/* clockid ref time */
 959	data64 = &ff->ph->env.clock.clockid_ns;
 960
 961	return do_write(ff, data64, sizeof(*data64));
 962}
 963
 964static int write_hybrid_topology(struct feat_fd *ff,
 965				 struct evlist *evlist __maybe_unused)
 966{
 967	struct hybrid_topology *tp;
 968	int ret;
 969	u32 i;
 970
 971	tp = hybrid_topology__new();
 972	if (!tp)
 973		return -ENOENT;
 974
 975	ret = do_write(ff, &tp->nr, sizeof(u32));
 976	if (ret < 0)
 977		goto err;
 978
 979	for (i = 0; i < tp->nr; i++) {
 980		struct hybrid_topology_node *n = &tp->nodes[i];
 981
 982		ret = do_write_string(ff, n->pmu_name);
 983		if (ret < 0)
 984			goto err;
 985
 986		ret = do_write_string(ff, n->cpus);
 987		if (ret < 0)
 988			goto err;
 989	}
 990
 991	ret = 0;
 992
 993err:
 994	hybrid_topology__delete(tp);
 995	return ret;
 996}
 997
 998static int write_dir_format(struct feat_fd *ff,
 999			    struct evlist *evlist __maybe_unused)
1000{
1001	struct perf_session *session;
1002	struct perf_data *data;
1003
1004	session = container_of(ff->ph, struct perf_session, header);
1005	data = session->data;
1006
1007	if (WARN_ON(!perf_data__is_dir(data)))
1008		return -1;
1009
1010	return do_write(ff, &data->dir.version, sizeof(data->dir.version));
1011}
1012
1013#ifdef HAVE_LIBBPF_SUPPORT
1014static int write_bpf_prog_info(struct feat_fd *ff,
1015			       struct evlist *evlist __maybe_unused)
1016{
1017	struct perf_env *env = &ff->ph->env;
1018	struct rb_root *root;
1019	struct rb_node *next;
1020	int ret = 0;
1021
1022	down_read(&env->bpf_progs.lock);
1023
1024	ret = do_write(ff, &env->bpf_progs.infos_cnt,
1025		       sizeof(env->bpf_progs.infos_cnt));
1026	if (ret < 0 || env->bpf_progs.infos_cnt == 0)
1027		goto out;
1028
1029	root = &env->bpf_progs.infos;
1030	next = rb_first(root);
1031	while (next) {
1032		struct bpf_prog_info_node *node;
1033		size_t len;
1034
1035		node = rb_entry(next, struct bpf_prog_info_node, rb_node);
1036		next = rb_next(&node->rb_node);
1037		len = sizeof(struct perf_bpil) +
1038			node->info_linear->data_len;
1039
1040		/* before writing to file, translate address to offset */
1041		bpil_addr_to_offs(node->info_linear);
1042		ret = do_write(ff, node->info_linear, len);
1043		/*
1044		 * translate back to address even when do_write() fails,
1045		 * so that this function never changes the data.
1046		 */
1047		bpil_offs_to_addr(node->info_linear);
1048		if (ret < 0)
1049			goto out;
1050	}
1051out:
1052	up_read(&env->bpf_progs.lock);
1053	return ret;
1054}
1055
1056static int write_bpf_btf(struct feat_fd *ff,
1057			 struct evlist *evlist __maybe_unused)
1058{
1059	struct perf_env *env = &ff->ph->env;
1060	struct rb_root *root;
1061	struct rb_node *next;
1062	int ret = 0;
1063
1064	down_read(&env->bpf_progs.lock);
1065
1066	ret = do_write(ff, &env->bpf_progs.btfs_cnt,
1067		       sizeof(env->bpf_progs.btfs_cnt));
1068
1069	if (ret < 0 || env->bpf_progs.btfs_cnt == 0)
1070		goto out;
1071
1072	root = &env->bpf_progs.btfs;
1073	next = rb_first(root);
1074	while (next) {
1075		struct btf_node *node;
1076
1077		node = rb_entry(next, struct btf_node, rb_node);
1078		next = rb_next(&node->rb_node);
1079		ret = do_write(ff, &node->id,
1080			       sizeof(u32) * 2 + node->data_size);
1081		if (ret < 0)
1082			goto out;
1083	}
1084out:
1085	up_read(&env->bpf_progs.lock);
1086	return ret;
1087}
1088#endif // HAVE_LIBBPF_SUPPORT
1089
1090static int cpu_cache_level__sort(const void *a, const void *b)
1091{
1092	struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
1093	struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
1094
1095	return cache_a->level - cache_b->level;
1096}
1097
1098static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
1099{
1100	if (a->level != b->level)
1101		return false;
1102
1103	if (a->line_size != b->line_size)
1104		return false;
1105
1106	if (a->sets != b->sets)
1107		return false;
1108
1109	if (a->ways != b->ways)
1110		return false;
1111
1112	if (strcmp(a->type, b->type))
1113		return false;
1114
1115	if (strcmp(a->size, b->size))
1116		return false;
1117
1118	if (strcmp(a->map, b->map))
1119		return false;
1120
1121	return true;
1122}
1123
1124static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
1125{
1126	char path[PATH_MAX], file[PATH_MAX];
1127	struct stat st;
1128	size_t len;
1129
1130	scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
1131	scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
1132
1133	if (stat(file, &st))
1134		return 1;
1135
1136	scnprintf(file, PATH_MAX, "%s/level", path);
1137	if (sysfs__read_int(file, (int *) &cache->level))
1138		return -1;
1139
1140	scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
1141	if (sysfs__read_int(file, (int *) &cache->line_size))
1142		return -1;
1143
1144	scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
1145	if (sysfs__read_int(file, (int *) &cache->sets))
1146		return -1;
1147
1148	scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
1149	if (sysfs__read_int(file, (int *) &cache->ways))
1150		return -1;
1151
1152	scnprintf(file, PATH_MAX, "%s/type", path);
1153	if (sysfs__read_str(file, &cache->type, &len))
1154		return -1;
1155
1156	cache->type[len] = 0;
1157	cache->type = strim(cache->type);
1158
1159	scnprintf(file, PATH_MAX, "%s/size", path);
1160	if (sysfs__read_str(file, &cache->size, &len)) {
1161		zfree(&cache->type);
1162		return -1;
1163	}
1164
1165	cache->size[len] = 0;
1166	cache->size = strim(cache->size);
1167
1168	scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
1169	if (sysfs__read_str(file, &cache->map, &len)) {
1170		zfree(&cache->size);
1171		zfree(&cache->type);
1172		return -1;
1173	}
1174
1175	cache->map[len] = 0;
1176	cache->map = strim(cache->map);
1177	return 0;
1178}
1179
1180static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
1181{
1182	fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
1183}
1184
1185/*
1186 * Build caches levels for a particular CPU from the data in
1187 * /sys/devices/system/cpu/cpu<cpu>/cache/
1188 * The cache level data is stored in caches[] from index at
1189 * *cntp.
1190 */
1191int build_caches_for_cpu(u32 cpu, struct cpu_cache_level caches[], u32 *cntp)
1192{
1193	u16 level;
1194
1195	for (level = 0; level < MAX_CACHE_LVL; level++) {
1196		struct cpu_cache_level c;
1197		int err;
1198		u32 i;
1199
1200		err = cpu_cache_level__read(&c, cpu, level);
1201		if (err < 0)
1202			return err;
1203
1204		if (err == 1)
1205			break;
1206
1207		for (i = 0; i < *cntp; i++) {
1208			if (cpu_cache_level__cmp(&c, &caches[i]))
1209				break;
1210		}
1211
1212		if (i == *cntp) {
1213			caches[*cntp] = c;
1214			*cntp = *cntp + 1;
1215		} else
1216			cpu_cache_level__free(&c);
1217	}
1218
1219	return 0;
1220}
1221
1222static int build_caches(struct cpu_cache_level caches[], u32 *cntp)
1223{
1224	u32 nr, cpu, cnt = 0;
1225
1226	nr = cpu__max_cpu().cpu;
1227
1228	for (cpu = 0; cpu < nr; cpu++) {
1229		int ret = build_caches_for_cpu(cpu, caches, &cnt);
1230
1231		if (ret)
1232			return ret;
1233	}
1234	*cntp = cnt;
1235	return 0;
1236}
1237
1238static int write_cache(struct feat_fd *ff,
1239		       struct evlist *evlist __maybe_unused)
1240{
1241	u32 max_caches = cpu__max_cpu().cpu * MAX_CACHE_LVL;
1242	struct cpu_cache_level caches[max_caches];
1243	u32 cnt = 0, i, version = 1;
1244	int ret;
1245
1246	ret = build_caches(caches, &cnt);
1247	if (ret)
1248		goto out;
1249
1250	qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1251
1252	ret = do_write(ff, &version, sizeof(u32));
1253	if (ret < 0)
1254		goto out;
1255
1256	ret = do_write(ff, &cnt, sizeof(u32));
1257	if (ret < 0)
1258		goto out;
1259
1260	for (i = 0; i < cnt; i++) {
1261		struct cpu_cache_level *c = &caches[i];
1262
1263		#define _W(v)					\
1264			ret = do_write(ff, &c->v, sizeof(u32));	\
1265			if (ret < 0)				\
1266				goto out;
1267
1268		_W(level)
1269		_W(line_size)
1270		_W(sets)
1271		_W(ways)
1272		#undef _W
1273
1274		#define _W(v)						\
1275			ret = do_write_string(ff, (const char *) c->v);	\
1276			if (ret < 0)					\
1277				goto out;
1278
1279		_W(type)
1280		_W(size)
1281		_W(map)
1282		#undef _W
1283	}
1284
1285out:
1286	for (i = 0; i < cnt; i++)
1287		cpu_cache_level__free(&caches[i]);
1288	return ret;
1289}
1290
1291static int write_stat(struct feat_fd *ff __maybe_unused,
1292		      struct evlist *evlist __maybe_unused)
1293{
1294	return 0;
1295}
1296
1297static int write_sample_time(struct feat_fd *ff,
1298			     struct evlist *evlist)
1299{
1300	int ret;
1301
1302	ret = do_write(ff, &evlist->first_sample_time,
1303		       sizeof(evlist->first_sample_time));
1304	if (ret < 0)
1305		return ret;
1306
1307	return do_write(ff, &evlist->last_sample_time,
1308			sizeof(evlist->last_sample_time));
1309}
1310
1311
1312static int memory_node__read(struct memory_node *n, unsigned long idx)
1313{
1314	unsigned int phys, size = 0;
1315	char path[PATH_MAX];
1316	struct io_dirent64 *ent;
1317	struct io_dir dir;
1318
1319#define for_each_memory(mem, dir)					\
1320	while ((ent = io_dir__readdir(&dir)) != NULL)			\
1321		if (strcmp(ent->d_name, ".") &&				\
1322		    strcmp(ent->d_name, "..") &&			\
1323		    sscanf(ent->d_name, "memory%u", &mem) == 1)
1324
1325	scnprintf(path, PATH_MAX,
1326		  "%s/devices/system/node/node%lu",
1327		  sysfs__mountpoint(), idx);
1328
1329	io_dir__init(&dir, open(path, O_CLOEXEC | O_DIRECTORY | O_RDONLY));
1330	if (dir.dirfd < 0) {
1331		pr_warning("failed: can't open memory sysfs data '%s'\n", path);
1332		return -1;
1333	}
1334
1335	for_each_memory(phys, dir) {
1336		size = max(phys, size);
1337	}
1338
1339	size++;
1340
1341	n->set = bitmap_zalloc(size);
1342	if (!n->set) {
1343		close(dir.dirfd);
1344		return -ENOMEM;
1345	}
1346
1347	n->node = idx;
1348	n->size = size;
1349
1350	io_dir__rewinddir(&dir);
1351
1352	for_each_memory(phys, dir) {
1353		__set_bit(phys, n->set);
1354	}
1355
1356	close(dir.dirfd);
1357	return 0;
1358}
1359
1360static void memory_node__delete_nodes(struct memory_node *nodesp, u64 cnt)
1361{
1362	for (u64 i = 0; i < cnt; i++)
1363		bitmap_free(nodesp[i].set);
1364
1365	free(nodesp);
1366}
1367
1368static int memory_node__sort(const void *a, const void *b)
1369{
1370	const struct memory_node *na = a;
1371	const struct memory_node *nb = b;
1372
1373	return na->node - nb->node;
1374}
1375
1376static int build_mem_topology(struct memory_node **nodesp, u64 *cntp)
1377{
1378	char path[PATH_MAX];
1379	struct io_dirent64 *ent;
1380	struct io_dir dir;
1381	int ret = 0;
1382	size_t cnt = 0, size = 0;
1383	struct memory_node *nodes = NULL;
1384
1385	scnprintf(path, PATH_MAX, "%s/devices/system/node/",
1386		  sysfs__mountpoint());
1387
1388	io_dir__init(&dir, open(path, O_CLOEXEC | O_DIRECTORY | O_RDONLY));
1389	if (dir.dirfd < 0) {
1390		pr_debug2("%s: couldn't read %s, does this arch have topology information?\n",
1391			  __func__, path);
1392		return -1;
1393	}
1394
1395	while (!ret && (ent = io_dir__readdir(&dir))) {
1396		unsigned int idx;
1397		int r;
1398
1399		if (!strcmp(ent->d_name, ".") ||
1400		    !strcmp(ent->d_name, ".."))
1401			continue;
1402
1403		r = sscanf(ent->d_name, "node%u", &idx);
1404		if (r != 1)
1405			continue;
1406
1407		if (cnt >= size) {
1408			struct memory_node *new_nodes =
1409				reallocarray(nodes, cnt + 4, sizeof(*nodes));
1410
1411			if (!new_nodes) {
1412				pr_err("Failed to write MEM_TOPOLOGY, size %zd nodes\n", size);
1413				ret = -ENOMEM;
1414				goto out;
1415			}
1416			nodes = new_nodes;
1417			size += 4;
1418		}
1419		ret = memory_node__read(&nodes[cnt], idx);
1420		if (!ret)
1421			cnt += 1;
1422	}
1423out:
1424	close(dir.dirfd);
1425	if (!ret) {
1426		*cntp = cnt;
1427		*nodesp = nodes;
1428		qsort(nodes, cnt, sizeof(nodes[0]), memory_node__sort);
1429	} else
1430		memory_node__delete_nodes(nodes, cnt);
1431
1432	return ret;
1433}
1434
1435/*
1436 * The MEM_TOPOLOGY holds physical memory map for every
1437 * node in system. The format of data is as follows:
1438 *
1439 *  0 - version          | for future changes
1440 *  8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
1441 * 16 - count            | number of nodes
1442 *
1443 * For each node we store map of physical indexes for
1444 * each node:
1445 *
1446 * 32 - node id          | node index
1447 * 40 - size             | size of bitmap
1448 * 48 - bitmap           | bitmap of memory indexes that belongs to node
1449 */
1450static int write_mem_topology(struct feat_fd *ff __maybe_unused,
1451			      struct evlist *evlist __maybe_unused)
1452{
1453	struct memory_node *nodes = NULL;
1454	u64 bsize, version = 1, i, nr = 0;
1455	int ret;
1456
1457	ret = sysfs__read_xll("devices/system/memory/block_size_bytes",
1458			      (unsigned long long *) &bsize);
1459	if (ret)
1460		return ret;
1461
1462	ret = build_mem_topology(&nodes, &nr);
1463	if (ret)
1464		return ret;
1465
1466	ret = do_write(ff, &version, sizeof(version));
1467	if (ret < 0)
1468		goto out;
1469
1470	ret = do_write(ff, &bsize, sizeof(bsize));
1471	if (ret < 0)
1472		goto out;
1473
1474	ret = do_write(ff, &nr, sizeof(nr));
1475	if (ret < 0)
1476		goto out;
1477
1478	for (i = 0; i < nr; i++) {
1479		struct memory_node *n = &nodes[i];
1480
1481		#define _W(v)						\
1482			ret = do_write(ff, &n->v, sizeof(n->v));	\
1483			if (ret < 0)					\
1484				goto out;
1485
1486		_W(node)
1487		_W(size)
1488
1489		#undef _W
1490
1491		ret = do_write_bitmap(ff, n->set, n->size);
1492		if (ret < 0)
1493			goto out;
1494	}
1495
1496out:
1497	memory_node__delete_nodes(nodes, nr);
1498	return ret;
1499}
1500
1501static int write_compressed(struct feat_fd *ff __maybe_unused,
1502			    struct evlist *evlist __maybe_unused)
1503{
1504	int ret;
1505
1506	ret = do_write(ff, &(ff->ph->env.comp_ver), sizeof(ff->ph->env.comp_ver));
1507	if (ret)
1508		return ret;
1509
1510	ret = do_write(ff, &(ff->ph->env.comp_type), sizeof(ff->ph->env.comp_type));
1511	if (ret)
1512		return ret;
1513
1514	ret = do_write(ff, &(ff->ph->env.comp_level), sizeof(ff->ph->env.comp_level));
1515	if (ret)
1516		return ret;
1517
1518	ret = do_write(ff, &(ff->ph->env.comp_ratio), sizeof(ff->ph->env.comp_ratio));
1519	if (ret)
1520		return ret;
1521
1522	return do_write(ff, &(ff->ph->env.comp_mmap_len), sizeof(ff->ph->env.comp_mmap_len));
1523}
1524
1525static int __write_pmu_caps(struct feat_fd *ff, struct perf_pmu *pmu,
1526			    bool write_pmu)
1527{
1528	struct perf_pmu_caps *caps = NULL;
1529	int ret;
1530
1531	ret = do_write(ff, &pmu->nr_caps, sizeof(pmu->nr_caps));
1532	if (ret < 0)
1533		return ret;
1534
1535	list_for_each_entry(caps, &pmu->caps, list) {
1536		ret = do_write_string(ff, caps->name);
1537		if (ret < 0)
1538			return ret;
1539
1540		ret = do_write_string(ff, caps->value);
1541		if (ret < 0)
1542			return ret;
1543	}
1544
1545	if (write_pmu) {
1546		ret = do_write_string(ff, pmu->name);
1547		if (ret < 0)
1548			return ret;
1549	}
1550
1551	return ret;
1552}
1553
1554static int write_cpu_pmu_caps(struct feat_fd *ff,
1555			      struct evlist *evlist __maybe_unused)
1556{
1557	struct perf_pmu *cpu_pmu = perf_pmus__find_core_pmu();
1558	int ret;
1559
1560	if (!cpu_pmu)
1561		return -ENOENT;
1562
1563	ret = perf_pmu__caps_parse(cpu_pmu);
1564	if (ret < 0)
1565		return ret;
1566
1567	return __write_pmu_caps(ff, cpu_pmu, false);
1568}
1569
1570static int write_pmu_caps(struct feat_fd *ff,
1571			  struct evlist *evlist __maybe_unused)
1572{
1573	struct perf_pmu *pmu = NULL;
1574	int nr_pmu = 0;
1575	int ret;
1576
1577	while ((pmu = perf_pmus__scan(pmu))) {
1578		if (!strcmp(pmu->name, "cpu")) {
1579			/*
1580			 * The "cpu" PMU is special and covered by
1581			 * HEADER_CPU_PMU_CAPS. Note, core PMUs are
1582			 * counted/written here for ARM, s390 and Intel hybrid.
1583			 */
1584			continue;
1585		}
1586		if (perf_pmu__caps_parse(pmu) <= 0)
1587			continue;
1588		nr_pmu++;
1589	}
1590
1591	ret = do_write(ff, &nr_pmu, sizeof(nr_pmu));
1592	if (ret < 0)
1593		return ret;
1594
1595	if (!nr_pmu)
1596		return 0;
1597
1598	/*
1599	 * Note older perf tools assume core PMUs come first, this is a property
1600	 * of perf_pmus__scan.
1601	 */
1602	pmu = NULL;
1603	while ((pmu = perf_pmus__scan(pmu))) {
1604		if (!strcmp(pmu->name, "cpu")) {
1605			/* Skip as above. */
1606			continue;
1607		}
1608		if (perf_pmu__caps_parse(pmu) <= 0)
1609			continue;
1610		ret = __write_pmu_caps(ff, pmu, true);
1611		if (ret < 0)
1612			return ret;
1613	}
1614	return 0;
1615}
1616
1617static void print_hostname(struct feat_fd *ff, FILE *fp)
1618{
1619	fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
1620}
1621
1622static void print_osrelease(struct feat_fd *ff, FILE *fp)
1623{
1624	fprintf(fp, "# os release : %s\n", ff->ph->env.os_release);
1625}
1626
1627static void print_arch(struct feat_fd *ff, FILE *fp)
1628{
1629	fprintf(fp, "# arch : %s\n", ff->ph->env.arch);
1630}
1631
1632static void print_cpudesc(struct feat_fd *ff, FILE *fp)
1633{
1634	fprintf(fp, "# cpudesc : %s\n", ff->ph->env.cpu_desc);
1635}
1636
1637static void print_nrcpus(struct feat_fd *ff, FILE *fp)
1638{
1639	fprintf(fp, "# nrcpus online : %u\n", ff->ph->env.nr_cpus_online);
1640	fprintf(fp, "# nrcpus avail : %u\n", ff->ph->env.nr_cpus_avail);
1641}
1642
1643static void print_version(struct feat_fd *ff, FILE *fp)
1644{
1645	fprintf(fp, "# perf version : %s\n", ff->ph->env.version);
1646}
1647
1648static void print_cmdline(struct feat_fd *ff, FILE *fp)
1649{
1650	int nr, i;
1651
1652	nr = ff->ph->env.nr_cmdline;
1653
1654	fprintf(fp, "# cmdline : ");
1655
1656	for (i = 0; i < nr; i++) {
1657		char *argv_i = strdup(ff->ph->env.cmdline_argv[i]);
1658		if (!argv_i) {
1659			fprintf(fp, "%s ", ff->ph->env.cmdline_argv[i]);
1660		} else {
1661			char *mem = argv_i;
1662			do {
1663				char *quote = strchr(argv_i, '\'');
1664				if (!quote)
1665					break;
1666				*quote++ = '\0';
1667				fprintf(fp, "%s\\\'", argv_i);
1668				argv_i = quote;
1669			} while (1);
1670			fprintf(fp, "%s ", argv_i);
1671			free(mem);
1672		}
1673	}
1674	fputc('\n', fp);
1675}
1676
1677static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
1678{
1679	struct perf_header *ph = ff->ph;
1680	int cpu_nr = ph->env.nr_cpus_avail;
1681	int nr, i;
1682	char *str;
1683
1684	nr = ph->env.nr_sibling_cores;
1685	str = ph->env.sibling_cores;
1686
1687	for (i = 0; i < nr; i++) {
1688		fprintf(fp, "# sibling sockets : %s\n", str);
1689		str += strlen(str) + 1;
1690	}
1691
1692	if (ph->env.nr_sibling_dies) {
1693		nr = ph->env.nr_sibling_dies;
1694		str = ph->env.sibling_dies;
1695
1696		for (i = 0; i < nr; i++) {
1697			fprintf(fp, "# sibling dies    : %s\n", str);
1698			str += strlen(str) + 1;
1699		}
1700	}
1701
1702	nr = ph->env.nr_sibling_threads;
1703	str = ph->env.sibling_threads;
1704
1705	for (i = 0; i < nr; i++) {
1706		fprintf(fp, "# sibling threads : %s\n", str);
1707		str += strlen(str) + 1;
1708	}
1709
1710	if (ph->env.nr_sibling_dies) {
1711		if (ph->env.cpu != NULL) {
1712			for (i = 0; i < cpu_nr; i++)
1713				fprintf(fp, "# CPU %d: Core ID %d, "
1714					    "Die ID %d, Socket ID %d\n",
1715					    i, ph->env.cpu[i].core_id,
1716					    ph->env.cpu[i].die_id,
1717					    ph->env.cpu[i].socket_id);
1718		} else
1719			fprintf(fp, "# Core ID, Die ID and Socket ID "
1720				    "information is not available\n");
1721	} else {
1722		if (ph->env.cpu != NULL) {
1723			for (i = 0; i < cpu_nr; i++)
1724				fprintf(fp, "# CPU %d: Core ID %d, "
1725					    "Socket ID %d\n",
1726					    i, ph->env.cpu[i].core_id,
1727					    ph->env.cpu[i].socket_id);
1728		} else
1729			fprintf(fp, "# Core ID and Socket ID "
1730				    "information is not available\n");
1731	}
1732}
1733
1734static void print_clockid(struct feat_fd *ff, FILE *fp)
1735{
1736	fprintf(fp, "# clockid frequency: %"PRIu64" MHz\n",
1737		ff->ph->env.clock.clockid_res_ns * 1000);
1738}
1739
1740static void print_clock_data(struct feat_fd *ff, FILE *fp)
1741{
1742	struct timespec clockid_ns;
1743	char tstr[64], date[64];
1744	struct timeval tod_ns;
1745	clockid_t clockid;
1746	struct tm ltime;
1747	u64 ref;
1748
1749	if (!ff->ph->env.clock.enabled) {
1750		fprintf(fp, "# reference time disabled\n");
1751		return;
1752	}
1753
1754	/* Compute TOD time. */
1755	ref = ff->ph->env.clock.tod_ns;
1756	tod_ns.tv_sec = ref / NSEC_PER_SEC;
1757	ref -= tod_ns.tv_sec * NSEC_PER_SEC;
1758	tod_ns.tv_usec = ref / NSEC_PER_USEC;
1759
1760	/* Compute clockid time. */
1761	ref = ff->ph->env.clock.clockid_ns;
1762	clockid_ns.tv_sec = ref / NSEC_PER_SEC;
1763	ref -= clockid_ns.tv_sec * NSEC_PER_SEC;
1764	clockid_ns.tv_nsec = ref;
1765
1766	clockid = ff->ph->env.clock.clockid;
1767
1768	if (localtime_r(&tod_ns.tv_sec, &ltime) == NULL)
1769		snprintf(tstr, sizeof(tstr), "<error>");
1770	else {
1771		strftime(date, sizeof(date), "%F %T", &ltime);
1772		scnprintf(tstr, sizeof(tstr), "%s.%06d",
1773			  date, (int) tod_ns.tv_usec);
1774	}
1775
1776	fprintf(fp, "# clockid: %s (%u)\n", clockid_name(clockid), clockid);
1777	fprintf(fp, "# reference time: %s = %ld.%06d (TOD) = %ld.%09ld (%s)\n",
1778		    tstr, (long) tod_ns.tv_sec, (int) tod_ns.tv_usec,
1779		    (long) clockid_ns.tv_sec, clockid_ns.tv_nsec,
1780		    clockid_name(clockid));
1781}
1782
1783static void print_hybrid_topology(struct feat_fd *ff, FILE *fp)
1784{
1785	int i;
1786	struct hybrid_node *n;
1787
1788	fprintf(fp, "# hybrid cpu system:\n");
1789	for (i = 0; i < ff->ph->env.nr_hybrid_nodes; i++) {
1790		n = &ff->ph->env.hybrid_nodes[i];
1791		fprintf(fp, "# %s cpu list : %s\n", n->pmu_name, n->cpus);
1792	}
1793}
1794
1795static void print_dir_format(struct feat_fd *ff, FILE *fp)
1796{
1797	struct perf_session *session;
1798	struct perf_data *data;
1799
1800	session = container_of(ff->ph, struct perf_session, header);
1801	data = session->data;
1802
1803	fprintf(fp, "# directory data version : %"PRIu64"\n", data->dir.version);
1804}
1805
1806#ifdef HAVE_LIBBPF_SUPPORT
1807static void print_bpf_prog_info(struct feat_fd *ff, FILE *fp)
1808{
1809	struct perf_env *env = &ff->ph->env;
1810	struct rb_root *root;
1811	struct rb_node *next;
1812
1813	down_read(&env->bpf_progs.lock);
1814
1815	root = &env->bpf_progs.infos;
1816	next = rb_first(root);
1817
1818	if (!next)
1819		printf("# bpf_prog_info empty\n");
1820
1821	while (next) {
1822		struct bpf_prog_info_node *node;
1823
1824		node = rb_entry(next, struct bpf_prog_info_node, rb_node);
1825		next = rb_next(&node->rb_node);
1826
1827		__bpf_event__print_bpf_prog_info(&node->info_linear->info,
1828						 env, fp);
1829	}
1830
1831	up_read(&env->bpf_progs.lock);
1832}
1833
1834static void print_bpf_btf(struct feat_fd *ff, FILE *fp)
1835{
1836	struct perf_env *env = &ff->ph->env;
1837	struct rb_root *root;
1838	struct rb_node *next;
1839
1840	down_read(&env->bpf_progs.lock);
1841
1842	root = &env->bpf_progs.btfs;
1843	next = rb_first(root);
1844
1845	if (!next)
1846		printf("# btf info empty\n");
1847
1848	while (next) {
1849		struct btf_node *node;
1850
1851		node = rb_entry(next, struct btf_node, rb_node);
1852		next = rb_next(&node->rb_node);
1853		fprintf(fp, "# btf info of id %u\n", node->id);
1854	}
1855
1856	up_read(&env->bpf_progs.lock);
1857}
1858#endif // HAVE_LIBBPF_SUPPORT
1859
1860static void free_event_desc(struct evsel *events)
1861{
1862	struct evsel *evsel;
1863
1864	if (!events)
1865		return;
1866
1867	for (evsel = events; evsel->core.attr.size; evsel++) {
1868		zfree(&evsel->name);
1869		zfree(&evsel->core.id);
1870	}
1871
1872	free(events);
1873}
1874
1875static bool perf_attr_check(struct perf_event_attr *attr)
1876{
1877	if (attr->__reserved_1 || attr->__reserved_2 || attr->__reserved_3) {
1878		pr_warning("Reserved bits are set unexpectedly. "
1879			   "Please update perf tool.\n");
1880		return false;
1881	}
1882
1883	if (attr->sample_type & ~(PERF_SAMPLE_MAX-1)) {
1884		pr_warning("Unknown sample type (0x%llx) is detected. "
1885			   "Please update perf tool.\n",
1886			   attr->sample_type);
1887		return false;
1888	}
1889
1890	if (attr->read_format & ~(PERF_FORMAT_MAX-1)) {
1891		pr_warning("Unknown read format (0x%llx) is detected. "
1892			   "Please update perf tool.\n",
1893			   attr->read_format);
1894		return false;
1895	}
1896
1897	if ((attr->sample_type & PERF_SAMPLE_BRANCH_STACK) &&
1898	    (attr->branch_sample_type & ~(PERF_SAMPLE_BRANCH_MAX-1))) {
1899		pr_warning("Unknown branch sample type (0x%llx) is detected. "
1900			   "Please update perf tool.\n",
1901			   attr->branch_sample_type);
1902
1903		return false;
1904	}
1905
1906	return true;
1907}
1908
1909static struct evsel *read_event_desc(struct feat_fd *ff)
1910{
1911	struct evsel *evsel, *events = NULL;
1912	u64 *id;
1913	void *buf = NULL;
1914	u32 nre, sz, nr, i, j;
1915	size_t msz;
1916
1917	/* number of events */
1918	if (do_read_u32(ff, &nre))
1919		goto error;
1920
1921	if (do_read_u32(ff, &sz))
1922		goto error;
1923
1924	/* buffer to hold on file attr struct */
1925	buf = malloc(sz);
1926	if (!buf)
1927		goto error;
1928
1929	/* the last event terminates with evsel->core.attr.size == 0: */
1930	events = calloc(nre + 1, sizeof(*events));
1931	if (!events)
1932		goto error;
1933
1934	msz = sizeof(evsel->core.attr);
1935	if (sz < msz)
1936		msz = sz;
1937
1938	for (i = 0, evsel = events; i < nre; evsel++, i++) {
1939		evsel->core.idx = i;
1940
1941		/*
1942		 * must read entire on-file attr struct to
1943		 * sync up with layout.
1944		 */
1945		if (__do_read(ff, buf, sz))
1946			goto error;
1947
1948		if (ff->ph->needs_swap)
1949			perf_event__attr_swap(buf);
1950
1951		memcpy(&evsel->core.attr, buf, msz);
1952
1953		if (!perf_attr_check(&evsel->core.attr))
1954			goto error;
1955
1956		if (do_read_u32(ff, &nr))
1957			goto error;
1958
1959		if (ff->ph->needs_swap)
1960			evsel->needs_swap = true;
1961
1962		evsel->name = do_read_string(ff);
1963		if (!evsel->name)
1964			goto error;
1965
1966		if (!nr)
1967			continue;
1968
1969		id = calloc(nr, sizeof(*id));
1970		if (!id)
1971			goto error;
1972		evsel->core.ids = nr;
1973		evsel->core.id = id;
1974
1975		for (j = 0 ; j < nr; j++) {
1976			if (do_read_u64(ff, id))
1977				goto error;
1978			id++;
1979		}
1980	}
1981out:
1982	free(buf);
1983	return events;
1984error:
1985	free_event_desc(events);
1986	events = NULL;
1987	goto out;
1988}
1989
1990static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1991				void *priv __maybe_unused)
1992{
1993	return fprintf(fp, ", %s = %s", name, val);
1994}
1995
1996static void print_event_desc(struct feat_fd *ff, FILE *fp)
1997{
1998	struct evsel *evsel, *events;
1999	u32 j;
2000	u64 *id;
2001
2002	if (ff->events)
2003		events = ff->events;
2004	else
2005		events = read_event_desc(ff);
2006
2007	if (!events) {
2008		fprintf(fp, "# event desc: not available or unable to read\n");
2009		return;
2010	}
2011
2012	for (evsel = events; evsel->core.attr.size; evsel++) {
2013		fprintf(fp, "# event : name = %s, ", evsel->name);
2014
2015		if (evsel->core.ids) {
2016			fprintf(fp, ", id = {");
2017			for (j = 0, id = evsel->core.id; j < evsel->core.ids; j++, id++) {
2018				if (j)
2019					fputc(',', fp);
2020				fprintf(fp, " %"PRIu64, *id);
2021			}
2022			fprintf(fp, " }");
2023		}
2024
2025		perf_event_attr__fprintf(fp, &evsel->core.attr, __desc_attr__fprintf, NULL);
2026
2027		fputc('\n', fp);
2028	}
2029
2030	free_event_desc(events);
2031	ff->events = NULL;
2032}
2033
2034static void print_total_mem(struct feat_fd *ff, FILE *fp)
2035{
2036	fprintf(fp, "# total memory : %llu kB\n", ff->ph->env.total_mem);
2037}
2038
2039static void print_numa_topology(struct feat_fd *ff, FILE *fp)
2040{
2041	int i;
2042	struct numa_node *n;
2043
2044	for (i = 0; i < ff->ph->env.nr_numa_nodes; i++) {
2045		n = &ff->ph->env.numa_nodes[i];
2046
2047		fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
2048			    " free = %"PRIu64" kB\n",
2049			n->node, n->mem_total, n->mem_free);
2050
2051		fprintf(fp, "# node%u cpu list : ", n->node);
2052		cpu_map__fprintf(n->map, fp);
2053	}
2054}
2055
2056static void print_cpuid(struct feat_fd *ff, FILE *fp)
2057{
2058	fprintf(fp, "# cpuid : %s\n", ff->ph->env.cpuid);
2059}
2060
2061static void print_branch_stack(struct feat_fd *ff __maybe_unused, FILE *fp)
2062{
2063	fprintf(fp, "# contains samples with branch stack\n");
2064}
2065
2066static void print_auxtrace(struct feat_fd *ff __maybe_unused, FILE *fp)
2067{
2068	fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
2069}
2070
2071static void print_stat(struct feat_fd *ff __maybe_unused, FILE *fp)
2072{
2073	fprintf(fp, "# contains stat data\n");
2074}
2075
2076static void print_cache(struct feat_fd *ff, FILE *fp __maybe_unused)
2077{
2078	int i;
2079
2080	fprintf(fp, "# CPU cache info:\n");
2081	for (i = 0; i < ff->ph->env.caches_cnt; i++) {
2082		fprintf(fp, "#  ");
2083		cpu_cache_level__fprintf(fp, &ff->ph->env.caches[i]);
2084	}
2085}
2086
2087static void print_compressed(struct feat_fd *ff, FILE *fp)
2088{
2089	fprintf(fp, "# compressed : %s, level = %d, ratio = %d\n",
2090		ff->ph->env.comp_type == PERF_COMP_ZSTD ? "Zstd" : "Unknown",
2091		ff->ph->env.comp_level, ff->ph->env.comp_ratio);
2092}
2093
2094static void __print_pmu_caps(FILE *fp, int nr_caps, char **caps, char *pmu_name)
2095{
2096	const char *delimiter = "";
2097	int i;
2098
2099	if (!nr_caps) {
2100		fprintf(fp, "# %s pmu capabilities: not available\n", pmu_name);
2101		return;
2102	}
2103
2104	fprintf(fp, "# %s pmu capabilities: ", pmu_name);
2105	for (i = 0; i < nr_caps; i++) {
2106		fprintf(fp, "%s%s", delimiter, caps[i]);
2107		delimiter = ", ";
2108	}
2109
2110	fprintf(fp, "\n");
2111}
2112
2113static void print_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)
2114{
2115	__print_pmu_caps(fp, ff->ph->env.nr_cpu_pmu_caps,
2116			 ff->ph->env.cpu_pmu_caps, (char *)"cpu");
2117}
2118
2119static void print_pmu_caps(struct feat_fd *ff, FILE *fp)
2120{
2121	struct perf_env *env = &ff->ph->env;
2122	struct pmu_caps *pmu_caps;
2123
2124	for (int i = 0; i < env->nr_pmus_with_caps; i++) {
2125		pmu_caps = &env->pmu_caps[i];
2126		__print_pmu_caps(fp, pmu_caps->nr_caps, pmu_caps->caps,
2127				 pmu_caps->pmu_name);
2128	}
2129
2130	if (strcmp(perf_env__arch(env), "x86") == 0 &&
2131	    perf_env__has_pmu_mapping(env, "ibs_op")) {
2132		char *max_precise = perf_env__find_pmu_cap(env, "cpu", "max_precise");
2133
2134		if (max_precise != NULL && atoi(max_precise) == 0)
2135			fprintf(fp, "# AMD systems uses ibs_op// PMU for some precise events, e.g.: cycles:p, see the 'perf list' man page for further details.\n");
2136	}
2137}
2138
2139static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
2140{
2141	struct perf_env *env = &ff->ph->env;
2142	const char *delimiter = "# pmu mappings: ";
2143	char *str, *tmp;
2144	u32 pmu_num;
2145	u32 type;
2146
2147	pmu_num = env->nr_pmu_mappings;
2148	if (!pmu_num) {
2149		fprintf(fp, "# pmu mappings: not available\n");
2150		return;
2151	}
2152
2153	str = env->pmu_mappings;
2154
2155	while (pmu_num) {
2156		type = strtoul(str, &tmp, 0);
2157		if (*tmp != ':')
2158			goto error;
2159
2160		str = tmp + 1;
2161		fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
2162
2163		delimiter = ", ";
2164		str += strlen(str) + 1;
2165		pmu_num--;
2166	}
2167
2168	fprintf(fp, "\n");
2169
2170	if (!pmu_num)
2171		return;
2172error:
2173	fprintf(fp, "# pmu mappings: unable to read\n");
2174}
2175
2176static void print_group_desc(struct feat_fd *ff, FILE *fp)
2177{
2178	struct perf_session *session;
2179	struct evsel *evsel;
2180	u32 nr = 0;
2181
2182	session = container_of(ff->ph, struct perf_session, header);
2183
2184	evlist__for_each_entry(session->evlist, evsel) {
2185		if (evsel__is_group_leader(evsel) && evsel->core.nr_members > 1) {
2186			fprintf(fp, "# group: %s{%s", evsel->group_name ?: "", evsel__name(evsel));
2187
2188			nr = evsel->core.nr_members - 1;
2189		} else if (nr) {
2190			fprintf(fp, ",%s", evsel__name(evsel));
2191
2192			if (--nr == 0)
2193				fprintf(fp, "}\n");
2194		}
2195	}
2196}
2197
2198static void print_sample_time(struct feat_fd *ff, FILE *fp)
2199{
2200	struct perf_session *session;
2201	char time_buf[32];
2202	double d;
2203
2204	session = container_of(ff->ph, struct perf_session, header);
2205
2206	timestamp__scnprintf_usec(session->evlist->first_sample_time,
2207				  time_buf, sizeof(time_buf));
2208	fprintf(fp, "# time of first sample : %s\n", time_buf);
2209
2210	timestamp__scnprintf_usec(session->evlist->last_sample_time,
2211				  time_buf, sizeof(time_buf));
2212	fprintf(fp, "# time of last sample : %s\n", time_buf);
2213
2214	d = (double)(session->evlist->last_sample_time -
2215		session->evlist->first_sample_time) / NSEC_PER_MSEC;
2216
2217	fprintf(fp, "# sample duration : %10.3f ms\n", d);
2218}
2219
2220static void memory_node__fprintf(struct memory_node *n,
2221				 unsigned long long bsize, FILE *fp)
2222{
2223	char buf_map[100], buf_size[50];
2224	unsigned long long size;
2225
2226	size = bsize * bitmap_weight(n->set, n->size);
2227	unit_number__scnprintf(buf_size, 50, size);
2228
2229	bitmap_scnprintf(n->set, n->size, buf_map, 100);
2230	fprintf(fp, "#  %3" PRIu64 " [%s]: %s\n", n->node, buf_size, buf_map);
2231}
2232
2233static void print_mem_topology(struct feat_fd *ff, FILE *fp)
2234{
2235	struct perf_env *env = &ff->ph->env;
2236	struct memory_node *nodes;
2237	int i, nr;
2238
2239	nodes = env->memory_nodes;
2240	nr    = env->nr_memory_nodes;
2241
2242	fprintf(fp, "# memory nodes (nr %d, block size 0x%llx):\n",
2243		nr, env->memory_bsize);
2244
2245	for (i = 0; i < nr; i++) {
2246		memory_node__fprintf(&nodes[i], env->memory_bsize, fp);
2247	}
2248}
2249
2250static int __event_process_build_id(struct perf_record_header_build_id *bev,
2251				    char *filename,
2252				    struct perf_session *session)
2253{
2254	int err = -1;
2255	struct machine *machine;
2256	u16 cpumode;
2257	struct dso *dso;
2258	enum dso_space_type dso_space;
2259
2260	machine = perf_session__findnew_machine(session, bev->pid);
2261	if (!machine)
2262		goto out;
2263
2264	cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2265
2266	switch (cpumode) {
2267	case PERF_RECORD_MISC_KERNEL:
2268		dso_space = DSO_SPACE__KERNEL;
2269		break;
2270	case PERF_RECORD_MISC_GUEST_KERNEL:
2271		dso_space = DSO_SPACE__KERNEL_GUEST;
2272		break;
2273	case PERF_RECORD_MISC_USER:
2274	case PERF_RECORD_MISC_GUEST_USER:
2275		dso_space = DSO_SPACE__USER;
2276		break;
2277	default:
2278		goto out;
2279	}
2280
2281	dso = machine__findnew_dso(machine, filename);
2282	if (dso != NULL) {
2283		char sbuild_id[SBUILD_ID_SIZE];
2284		struct build_id bid;
2285		size_t size = BUILD_ID_SIZE;
2286
2287		if (bev->header.misc & PERF_RECORD_MISC_BUILD_ID_SIZE)
2288			size = bev->size;
2289
2290		build_id__init(&bid, bev->data, size);
2291		dso__set_build_id(dso, &bid);
2292		dso__set_header_build_id(dso, true);
2293
2294		if (dso_space != DSO_SPACE__USER) {
2295			struct kmod_path m = { .name = NULL, };
2296
2297			if (!kmod_path__parse_name(&m, filename) && m.kmod)
2298				dso__set_module_info(dso, &m, machine);
2299
2300			dso__set_kernel(dso, dso_space);
2301			free(m.name);
2302		}
2303
2304		build_id__snprintf(dso__bid(dso), sbuild_id, sizeof(sbuild_id));
2305		pr_debug("build id event received for %s: %s [%zu]\n",
2306			 dso__long_name(dso), sbuild_id, size);
2307		dso__put(dso);
2308	}
2309
2310	err = 0;
2311out:
2312	return err;
2313}
2314
2315static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
2316						 int input, u64 offset, u64 size)
2317{
2318	struct perf_session *session = container_of(header, struct perf_session, header);
2319	struct {
2320		struct perf_event_header   header;
2321		u8			   build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
2322		char			   filename[0];
2323	} old_bev;
2324	struct perf_record_header_build_id bev;
2325	char filename[PATH_MAX];
2326	u64 limit = offset + size;
2327
2328	while (offset < limit) {
2329		ssize_t len;
2330
2331		if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
2332			return -1;
2333
2334		if (header->needs_swap)
2335			perf_event_header__bswap(&old_bev.header);
2336
2337		len = old_bev.header.size - sizeof(old_bev);
2338		if (readn(input, filename, len) != len)
2339			return -1;
2340
2341		bev.header = old_bev.header;
2342
2343		/*
2344		 * As the pid is the missing value, we need to fill
2345		 * it properly. The header.misc value give us nice hint.
2346		 */
2347		bev.pid	= HOST_KERNEL_ID;
2348		if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
2349		    bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
2350			bev.pid	= DEFAULT_GUEST_KERNEL_ID;
2351
2352		memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
2353		__event_process_build_id(&bev, filename, session);
2354
2355		offset += bev.header.size;
2356	}
2357
2358	return 0;
2359}
2360
2361static int perf_header__read_build_ids(struct perf_header *header,
2362				       int input, u64 offset, u64 size)
2363{
2364	struct perf_session *session = container_of(header, struct perf_session, header);
2365	struct perf_record_header_build_id bev;
2366	char filename[PATH_MAX];
2367	u64 limit = offset + size, orig_offset = offset;
2368	int err = -1;
2369
2370	while (offset < limit) {
2371		ssize_t len;
2372
2373		if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
2374			goto out;
2375
2376		if (header->needs_swap)
2377			perf_event_header__bswap(&bev.header);
2378
2379		len = bev.header.size - sizeof(bev);
2380		if (readn(input, filename, len) != len)
2381			goto out;
2382		/*
2383		 * The a1645ce1 changeset:
2384		 *
2385		 * "perf: 'perf kvm' tool for monitoring guest performance from host"
2386		 *
2387		 * Added a field to struct perf_record_header_build_id that broke the file
2388		 * format.
2389		 *
2390		 * Since the kernel build-id is the first entry, process the
2391		 * table using the old format if the well known
2392		 * '[kernel.kallsyms]' string for the kernel build-id has the
2393		 * first 4 characters chopped off (where the pid_t sits).
2394		 */
2395		if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
2396			if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
2397				return -1;
2398			return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
2399		}
2400
2401		__event_process_build_id(&bev, filename, session);
2402
2403		offset += bev.header.size;
2404	}
2405	err = 0;
2406out:
2407	return err;
2408}
2409
2410/* Macro for features that simply need to read and store a string. */
2411#define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
2412static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
2413{\
2414	free(ff->ph->env.__feat_env);		     \
2415	ff->ph->env.__feat_env = do_read_string(ff); \
2416	return ff->ph->env.__feat_env ? 0 : -ENOMEM; \
2417}
2418
2419FEAT_PROCESS_STR_FUN(hostname, hostname);
2420FEAT_PROCESS_STR_FUN(osrelease, os_release);
2421FEAT_PROCESS_STR_FUN(version, version);
2422FEAT_PROCESS_STR_FUN(arch, arch);
2423FEAT_PROCESS_STR_FUN(cpudesc, cpu_desc);
2424FEAT_PROCESS_STR_FUN(cpuid, cpuid);
2425
2426#ifdef HAVE_LIBTRACEEVENT
2427static int process_tracing_data(struct feat_fd *ff, void *data)
2428{
2429	ssize_t ret = trace_report(ff->fd, data, false);
2430
2431	return ret < 0 ? -1 : 0;
2432}
2433#endif
2434
2435static int process_build_id(struct feat_fd *ff, void *data __maybe_unused)
2436{
2437	if (perf_header__read_build_ids(ff->ph, ff->fd, ff->offset, ff->size))
2438		pr_debug("Failed to read buildids, continuing...\n");
2439	return 0;
2440}
2441
2442static int process_nrcpus(struct feat_fd *ff, void *data __maybe_unused)
2443{
2444	struct perf_env *env = &ff->ph->env;
2445	int ret;
2446	u32 nr_cpus_avail, nr_cpus_online;
2447
2448	ret = do_read_u32(ff, &nr_cpus_avail);
2449	if (ret)
2450		return ret;
2451
2452	ret = do_read_u32(ff, &nr_cpus_online);
2453	if (ret)
2454		return ret;
2455	env->nr_cpus_avail = (int)nr_cpus_avail;
2456	env->nr_cpus_online = (int)nr_cpus_online;
2457	return 0;
2458}
2459
2460static int process_total_mem(struct feat_fd *ff, void *data __maybe_unused)
2461{
2462	struct perf_env *env = &ff->ph->env;
2463	u64 total_mem;
2464	int ret;
2465
2466	ret = do_read_u64(ff, &total_mem);
2467	if (ret)
2468		return -1;
2469	env->total_mem = (unsigned long long)total_mem;
2470	return 0;
2471}
2472
2473static struct evsel *evlist__find_by_index(struct evlist *evlist, int idx)
2474{
2475	struct evsel *evsel;
2476
2477	evlist__for_each_entry(evlist, evsel) {
2478		if (evsel->core.idx == idx)
2479			return evsel;
2480	}
2481
2482	return NULL;
2483}
2484
2485static void evlist__set_event_name(struct evlist *evlist, struct evsel *event)
2486{
2487	struct evsel *evsel;
2488
2489	if (!event->name)
2490		return;
2491
2492	evsel = evlist__find_by_index(evlist, event->core.idx);
2493	if (!evsel)
2494		return;
2495
2496	if (evsel->name)
2497		return;
2498
2499	evsel->name = strdup(event->name);
2500}
2501
2502static int
2503process_event_desc(struct feat_fd *ff, void *data __maybe_unused)
2504{
2505	struct perf_session *session;
2506	struct evsel *evsel, *events = read_event_desc(ff);
2507
2508	if (!events)
2509		return 0;
2510
2511	session = container_of(ff->ph, struct perf_session, header);
2512
2513	if (session->data->is_pipe) {
2514		/* Save events for reading later by print_event_desc,
2515		 * since they can't be read again in pipe mode. */
2516		ff->events = events;
2517	}
2518
2519	for (evsel = events; evsel->core.attr.size; evsel++)
2520		evlist__set_event_name(session->evlist, evsel);
2521
2522	if (!session->data->is_pipe)
2523		free_event_desc(events);
2524
2525	return 0;
2526}
2527
2528static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)
2529{
2530	struct perf_env *env = &ff->ph->env;
2531	char *str, *cmdline = NULL, **argv = NULL;
2532	u32 nr, i, len = 0;
2533
2534	if (do_read_u32(ff, &nr))
2535		return -1;
2536
2537	env->nr_cmdline = nr;
2538
2539	cmdline = zalloc(ff->size + nr + 1);
2540	if (!cmdline)
2541		return -1;
2542
2543	argv = zalloc(sizeof(char *) * (nr + 1));
2544	if (!argv)
2545		goto error;
2546
2547	for (i = 0; i < nr; i++) {
2548		str = do_read_string(ff);
2549		if (!str)
2550			goto error;
2551
2552		argv[i] = cmdline + len;
2553		memcpy(argv[i], str, strlen(str) + 1);
2554		len += strlen(str) + 1;
2555		free(str);
2556	}
2557	env->cmdline = cmdline;
2558	env->cmdline_argv = (const char **) argv;
2559	return 0;
2560
2561error:
2562	free(argv);
2563	free(cmdline);
2564	return -1;
2565}
2566
2567static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
2568{
2569	u32 nr, i;
2570	char *str = NULL;
2571	struct strbuf sb;
2572	struct perf_env *env = &ff->ph->env;
2573	int cpu_nr = env->nr_cpus_avail;
2574	u64 size = 0;
2575
2576	env->cpu = calloc(cpu_nr, sizeof(*env->cpu));
2577	if (!env->cpu)
2578		return -1;
2579
2580	if (do_read_u32(ff, &nr))
2581		goto free_cpu;
2582
2583	env->nr_sibling_cores = nr;
2584	size += sizeof(u32);
2585	if (strbuf_init(&sb, 128) < 0)
2586		goto free_cpu;
2587
2588	for (i = 0; i < nr; i++) {
2589		str = do_read_string(ff);
2590		if (!str)
2591			goto error;
2592
2593		/* include a NULL character at the end */
2594		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2595			goto error;
2596		size += string_size(str);
2597		zfree(&str);
2598	}
2599	env->sibling_cores = strbuf_detach(&sb, NULL);
2600
2601	if (do_read_u32(ff, &nr))
2602		return -1;
2603
2604	env->nr_sibling_threads = nr;
2605	size += sizeof(u32);
2606
2607	for (i = 0; i < nr; i++) {
2608		str = do_read_string(ff);
2609		if (!str)
2610			goto error;
2611
2612		/* include a NULL character at the end */
2613		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2614			goto error;
2615		size += string_size(str);
2616		zfree(&str);
2617	}
2618	env->sibling_threads = strbuf_detach(&sb, NULL);
2619
2620	/*
2621	 * The header may be from old perf,
2622	 * which doesn't include core id and socket id information.
2623	 */
2624	if (ff->size <= size) {
2625		zfree(&env->cpu);
2626		return 0;
2627	}
2628
2629	for (i = 0; i < (u32)cpu_nr; i++) {
2630		if (do_read_u32(ff, &nr))
2631			goto free_cpu;
2632
2633		env->cpu[i].core_id = nr;
2634		size += sizeof(u32);
2635
2636		if (do_read_u32(ff, &nr))
2637			goto free_cpu;
2638
2639		env->cpu[i].socket_id = nr;
2640		size += sizeof(u32);
2641	}
2642
2643	/*
2644	 * The header may be from old perf,
2645	 * which doesn't include die information.
2646	 */
2647	if (ff->size <= size)
2648		return 0;
2649
2650	if (do_read_u32(ff, &nr))
2651		return -1;
2652
2653	env->nr_sibling_dies = nr;
2654	size += sizeof(u32);
2655
2656	for (i = 0; i < nr; i++) {
2657		str = do_read_string(ff);
2658		if (!str)
2659			goto error;
2660
2661		/* include a NULL character at the end */
2662		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
2663			goto error;
2664		size += string_size(str);
2665		zfree(&str);
2666	}
2667	env->sibling_dies = strbuf_detach(&sb, NULL);
2668
2669	for (i = 0; i < (u32)cpu_nr; i++) {
2670		if (do_read_u32(ff, &nr))
2671			goto free_cpu;
2672
2673		env->cpu[i].die_id = nr;
2674	}
2675
2676	return 0;
2677
2678error:
2679	strbuf_release(&sb);
2680	zfree(&str);
2681free_cpu:
2682	zfree(&env->cpu);
2683	return -1;
2684}
2685
2686static int process_numa_topology(struct feat_fd *ff, void *data __maybe_unused)
2687{
2688	struct perf_env *env = &ff->ph->env;
2689	struct numa_node *nodes, *n;
2690	u32 nr, i;
2691	char *str;
2692
2693	/* nr nodes */
2694	if (do_read_u32(ff, &nr))
2695		return -1;
2696
2697	nodes = zalloc(sizeof(*nodes) * nr);
2698	if (!nodes)
2699		return -ENOMEM;
2700
2701	for (i = 0; i < nr; i++) {
2702		n = &nodes[i];
2703
2704		/* node number */
2705		if (do_read_u32(ff, &n->node))
2706			goto error;
2707
2708		if (do_read_u64(ff, &n->mem_total))
2709			goto error;
2710
2711		if (do_read_u64(ff, &n->mem_free))
2712			goto error;
2713
2714		str = do_read_string(ff);
2715		if (!str)
2716			goto error;
2717
2718		n->map = perf_cpu_map__new(str);
2719		free(str);
2720		if (!n->map)
2721			goto error;
2722	}
2723	env->nr_numa_nodes = nr;
2724	env->numa_nodes = nodes;
2725	return 0;
2726
2727error:
2728	free(nodes);
2729	return -1;
2730}
2731
2732static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)
2733{
2734	struct perf_env *env = &ff->ph->env;
2735	char *name;
2736	u32 pmu_num;
2737	u32 type;
2738	struct strbuf sb;
2739
2740	if (do_read_u32(ff, &pmu_num))
2741		return -1;
2742
2743	if (!pmu_num) {
2744		pr_debug("pmu mappings not available\n");
2745		return 0;
2746	}
2747
2748	env->nr_pmu_mappings = pmu_num;
2749	if (strbuf_init(&sb, 128) < 0)
2750		return -1;
2751
2752	while (pmu_num) {
2753		if (do_read_u32(ff, &type))
2754			goto error;
2755
2756		name = do_read_string(ff);
2757		if (!name)
2758			goto error;
2759
2760		if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
2761			goto error;
2762		/* include a NULL character at the end */
2763		if (strbuf_add(&sb, "", 1) < 0)
2764			goto error;
2765
2766		if (!strcmp(name, "msr"))
2767			env->msr_pmu_type = type;
2768
2769		free(name);
2770		pmu_num--;
2771	}
2772	/* AMD may set it by evlist__has_amd_ibs() from perf_session__new() */
2773	free(env->pmu_mappings);
2774	env->pmu_mappings = strbuf_detach(&sb, NULL);
2775	return 0;
2776
2777error:
2778	strbuf_release(&sb);
2779	return -1;
2780}
2781
2782static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)
2783{
2784	struct perf_env *env = &ff->ph->env;
2785	size_t ret = -1;
2786	u32 i, nr, nr_groups;
2787	struct perf_session *session;
2788	struct evsel *evsel, *leader = NULL;
2789	struct group_desc {
2790		char *name;
2791		u32 leader_idx;
2792		u32 nr_members;
2793	} *desc;
2794
2795	if (do_read_u32(ff, &nr_groups))
2796		return -1;
2797
2798	env->nr_groups = nr_groups;
2799	if (!nr_groups) {
2800		pr_debug("group desc not available\n");
2801		return 0;
2802	}
2803
2804	desc = calloc(nr_groups, sizeof(*desc));
2805	if (!desc)
2806		return -1;
2807
2808	for (i = 0; i < nr_groups; i++) {
2809		desc[i].name = do_read_string(ff);
2810		if (!desc[i].name)
2811			goto out_free;
2812
2813		if (do_read_u32(ff, &desc[i].leader_idx))
2814			goto out_free;
2815
2816		if (do_read_u32(ff, &desc[i].nr_members))
2817			goto out_free;
2818	}
2819
2820	/*
2821	 * Rebuild group relationship based on the group_desc
2822	 */
2823	session = container_of(ff->ph, struct perf_session, header);
2824
2825	i = nr = 0;
2826	evlist__for_each_entry(session->evlist, evsel) {
2827		if (i < nr_groups && evsel->core.idx == (int) desc[i].leader_idx) {
2828			evsel__set_leader(evsel, evsel);
2829			/* {anon_group} is a dummy name */
2830			if (strcmp(desc[i].name, "{anon_group}")) {
2831				evsel->group_name = desc[i].name;
2832				desc[i].name = NULL;
2833			}
2834			evsel->core.nr_members = desc[i].nr_members;
2835
2836			if (i >= nr_groups || nr > 0) {
2837				pr_debug("invalid group desc\n");
2838				goto out_free;
2839			}
2840
2841			leader = evsel;
2842			nr = evsel->core.nr_members - 1;
2843			i++;
2844		} else if (nr) {
2845			/* This is a group member */
2846			evsel__set_leader(evsel, leader);
2847
2848			nr--;
2849		}
2850	}
2851
2852	if (i != nr_groups || nr != 0) {
2853		pr_debug("invalid group desc\n");
2854		goto out_free;
2855	}
2856
2857	ret = 0;
2858out_free:
2859	for (i = 0; i < nr_groups; i++)
2860		zfree(&desc[i].name);
2861	free(desc);
2862
2863	return ret;
2864}
2865
2866static int process_auxtrace(struct feat_fd *ff, void *data __maybe_unused)
2867{
2868	struct perf_session *session;
2869	int err;
2870
2871	session = container_of(ff->ph, struct perf_session, header);
2872
2873	err = auxtrace_index__process(ff->fd, ff->size, session,
2874				      ff->ph->needs_swap);
2875	if (err < 0)
2876		pr_err("Failed to process auxtrace index\n");
2877	return err;
2878}
2879
2880static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
2881{
2882	struct perf_env *env = &ff->ph->env;
2883	struct cpu_cache_level *caches;
2884	u32 cnt, i, version;
2885
2886	if (do_read_u32(ff, &version))
2887		return -1;
2888
2889	if (version != 1)
2890		return -1;
2891
2892	if (do_read_u32(ff, &cnt))
2893		return -1;
2894
2895	caches = zalloc(sizeof(*caches) * cnt);
2896	if (!caches)
2897		return -1;
2898
2899	for (i = 0; i < cnt; i++) {
2900		struct cpu_cache_level *c = &caches[i];
2901
2902		#define _R(v)						\
2903			if (do_read_u32(ff, &c->v))			\
2904				goto out_free_caches;			\
2905
2906		_R(level)
2907		_R(line_size)
2908		_R(sets)
2909		_R(ways)
2910		#undef _R
2911
2912		#define _R(v)					\
2913			c->v = do_read_string(ff);		\
2914			if (!c->v)				\
2915				goto out_free_caches;		\
2916
2917		_R(type)
2918		_R(size)
2919		_R(map)
2920		#undef _R
2921	}
2922
2923	env->caches = caches;
2924	env->caches_cnt = cnt;
2925	return 0;
2926out_free_caches:
2927	for (i = 0; i < cnt; i++) {
2928		free(caches[i].type);
2929		free(caches[i].size);
2930		free(caches[i].map);
2931	}
2932	free(caches);
2933	return -1;
2934}
2935
2936static int process_sample_time(struct feat_fd *ff, void *data __maybe_unused)
2937{
2938	struct perf_session *session;
2939	u64 first_sample_time, last_sample_time;
2940	int ret;
2941
2942	session = container_of(ff->ph, struct perf_session, header);
2943
2944	ret = do_read_u64(ff, &first_sample_time);
2945	if (ret)
2946		return -1;
2947
2948	ret = do_read_u64(ff, &last_sample_time);
2949	if (ret)
2950		return -1;
2951
2952	session->evlist->first_sample_time = first_sample_time;
2953	session->evlist->last_sample_time = last_sample_time;
2954	return 0;
2955}
2956
2957static int process_mem_topology(struct feat_fd *ff,
2958				void *data __maybe_unused)
2959{
2960	struct perf_env *env = &ff->ph->env;
2961	struct memory_node *nodes;
2962	u64 version, i, nr, bsize;
2963	int ret = -1;
2964
2965	if (do_read_u64(ff, &version))
2966		return -1;
2967
2968	if (version != 1)
2969		return -1;
2970
2971	if (do_read_u64(ff, &bsize))
2972		return -1;
2973
2974	if (do_read_u64(ff, &nr))
2975		return -1;
2976
2977	nodes = zalloc(sizeof(*nodes) * nr);
2978	if (!nodes)
2979		return -1;
2980
2981	for (i = 0; i < nr; i++) {
2982		struct memory_node n;
2983
2984		#define _R(v)				\
2985			if (do_read_u64(ff, &n.v))	\
2986				goto out;		\
2987
2988		_R(node)
2989		_R(size)
2990
2991		#undef _R
2992
2993		if (do_read_bitmap(ff, &n.set, &n.size))
2994			goto out;
2995
2996		nodes[i] = n;
2997	}
2998
2999	env->memory_bsize    = bsize;
3000	env->memory_nodes    = nodes;
3001	env->nr_memory_nodes = nr;
3002	ret = 0;
3003
3004out:
3005	if (ret)
3006		free(nodes);
3007	return ret;
3008}
3009
3010static int process_clockid(struct feat_fd *ff,
3011			   void *data __maybe_unused)
3012{
3013	struct perf_env *env = &ff->ph->env;
3014
3015	if (do_read_u64(ff, &env->clock.clockid_res_ns))
3016		return -1;
3017
3018	return 0;
3019}
3020
3021static int process_clock_data(struct feat_fd *ff,
3022			      void *_data __maybe_unused)
3023{
3024	struct perf_env *env = &ff->ph->env;
3025	u32 data32;
3026	u64 data64;
3027
3028	/* version */
3029	if (do_read_u32(ff, &data32))
3030		return -1;
3031
3032	if (data32 != 1)
3033		return -1;
3034
3035	/* clockid */
3036	if (do_read_u32(ff, &data32))
3037		return -1;
3038
3039	env->clock.clockid = data32;
3040
3041	/* TOD ref time */
3042	if (do_read_u64(ff, &data64))
3043		return -1;
3044
3045	env->clock.tod_ns = data64;
3046
3047	/* clockid ref time */
3048	if (do_read_u64(ff, &data64))
3049		return -1;
3050
3051	env->clock.clockid_ns = data64;
3052	env->clock.enabled = true;
3053	return 0;
3054}
3055
3056static int process_hybrid_topology(struct feat_fd *ff,
3057				   void *data __maybe_unused)
3058{
3059	struct perf_env *env = &ff->ph->env;
3060	struct hybrid_node *nodes, *n;
3061	u32 nr, i;
3062
3063	/* nr nodes */
3064	if (do_read_u32(ff, &nr))
3065		return -1;
3066
3067	nodes = zalloc(sizeof(*nodes) * nr);
3068	if (!nodes)
3069		return -ENOMEM;
3070
3071	for (i = 0; i < nr; i++) {
3072		n = &nodes[i];
3073
3074		n->pmu_name = do_read_string(ff);
3075		if (!n->pmu_name)
3076			goto error;
3077
3078		n->cpus = do_read_string(ff);
3079		if (!n->cpus)
3080			goto error;
3081	}
3082
3083	env->nr_hybrid_nodes = nr;
3084	env->hybrid_nodes = nodes;
3085	return 0;
3086
3087error:
3088	for (i = 0; i < nr; i++) {
3089		free(nodes[i].pmu_name);
3090		free(nodes[i].cpus);
3091	}
3092
3093	free(nodes);
3094	return -1;
3095}
3096
3097static int process_dir_format(struct feat_fd *ff,
3098			      void *_data __maybe_unused)
3099{
3100	struct perf_session *session;
3101	struct perf_data *data;
3102
3103	session = container_of(ff->ph, struct perf_session, header);
3104	data = session->data;
3105
3106	if (WARN_ON(!perf_data__is_dir(data)))
3107		return -1;
3108
3109	return do_read_u64(ff, &data->dir.version);
3110}
3111
3112#ifdef HAVE_LIBBPF_SUPPORT
3113static int process_bpf_prog_info(struct feat_fd *ff, void *data __maybe_unused)
3114{
3115	struct bpf_prog_info_node *info_node;
3116	struct perf_env *env = &ff->ph->env;
3117	struct perf_bpil *info_linear;
3118	u32 count, i;
3119	int err = -1;
3120
3121	if (ff->ph->needs_swap) {
3122		pr_warning("interpreting bpf_prog_info from systems with endianness is not yet supported\n");
3123		return 0;
3124	}
3125
3126	if (do_read_u32(ff, &count))
3127		return -1;
3128
3129	down_write(&env->bpf_progs.lock);
3130
3131	for (i = 0; i < count; ++i) {
3132		u32 info_len, data_len;
3133
3134		info_linear = NULL;
3135		info_node = NULL;
3136		if (do_read_u32(ff, &info_len))
3137			goto out;
3138		if (do_read_u32(ff, &data_len))
3139			goto out;
3140
3141		if (info_len > sizeof(struct bpf_prog_info)) {
3142			pr_warning("detected invalid bpf_prog_info\n");
3143			goto out;
3144		}
3145
3146		info_linear = malloc(sizeof(struct perf_bpil) +
3147				     data_len);
3148		if (!info_linear)
3149			goto out;
3150		info_linear->info_len = sizeof(struct bpf_prog_info);
3151		info_linear->data_len = data_len;
3152		if (do_read_u64(ff, (u64 *)(&info_linear->arrays)))
3153			goto out;
3154		if (__do_read(ff, &info_linear->info, info_len))
3155			goto out;
3156		if (info_len < sizeof(struct bpf_prog_info))
3157			memset(((void *)(&info_linear->info)) + info_len, 0,
3158			       sizeof(struct bpf_prog_info) - info_len);
3159
3160		if (__do_read(ff, info_linear->data, data_len))
3161			goto out;
3162
3163		info_node = malloc(sizeof(struct bpf_prog_info_node));
3164		if (!info_node)
3165			goto out;
3166
3167		/* after reading from file, translate offset to address */
3168		bpil_offs_to_addr(info_linear);
3169		info_node->info_linear = info_linear;
3170		info_node->metadata = NULL;
3171		if (!__perf_env__insert_bpf_prog_info(env, info_node)) {
3172			free(info_linear);
3173			free(info_node);
3174		}
3175	}
3176
3177	up_write(&env->bpf_progs.lock);
3178	return 0;
3179out:
3180	free(info_linear);
3181	free(info_node);
3182	up_write(&env->bpf_progs.lock);
3183	return err;
3184}
3185
3186static int process_bpf_btf(struct feat_fd *ff, void *data __maybe_unused)
3187{
3188	struct perf_env *env = &ff->ph->env;
3189	struct btf_node *node = NULL;
3190	u32 count, i;
3191	int err = -1;
3192
3193	if (ff->ph->needs_swap) {
3194		pr_warning("interpreting btf from systems with endianness is not yet supported\n");
3195		return 0;
3196	}
3197
3198	if (do_read_u32(ff, &count))
3199		return -1;
3200
3201	down_write(&env->bpf_progs.lock);
3202
3203	for (i = 0; i < count; ++i) {
3204		u32 id, data_size;
3205
3206		if (do_read_u32(ff, &id))
3207			goto out;
3208		if (do_read_u32(ff, &data_size))
3209			goto out;
3210
3211		node = malloc(sizeof(struct btf_node) + data_size);
3212		if (!node)
3213			goto out;
3214
3215		node->id = id;
3216		node->data_size = data_size;
3217
3218		if (__do_read(ff, node->data, data_size))
3219			goto out;
3220
3221		if (!__perf_env__insert_btf(env, node))
3222			free(node);
3223		node = NULL;
3224	}
3225
3226	err = 0;
3227out:
3228	up_write(&env->bpf_progs.lock);
3229	free(node);
3230	return err;
3231}
3232#endif // HAVE_LIBBPF_SUPPORT
3233
3234static int process_compressed(struct feat_fd *ff,
3235			      void *data __maybe_unused)
3236{
3237	struct perf_env *env = &ff->ph->env;
3238
3239	if (do_read_u32(ff, &(env->comp_ver)))
3240		return -1;
3241
3242	if (do_read_u32(ff, &(env->comp_type)))
3243		return -1;
3244
3245	if (do_read_u32(ff, &(env->comp_level)))
3246		return -1;
3247
3248	if (do_read_u32(ff, &(env->comp_ratio)))
3249		return -1;
3250
3251	if (do_read_u32(ff, &(env->comp_mmap_len)))
3252		return -1;
3253
3254	return 0;
3255}
3256
3257static int __process_pmu_caps(struct feat_fd *ff, int *nr_caps,
3258			      char ***caps, unsigned int *max_branches,
3259			      unsigned int *br_cntr_nr,
3260			      unsigned int *br_cntr_width)
3261{
3262	char *name, *value, *ptr;
3263	u32 nr_pmu_caps, i;
3264
3265	*nr_caps = 0;
3266	*caps = NULL;
3267
3268	if (do_read_u32(ff, &nr_pmu_caps))
3269		return -1;
3270
3271	if (!nr_pmu_caps)
3272		return 0;
3273
3274	*caps = zalloc(sizeof(char *) * nr_pmu_caps);
3275	if (!*caps)
3276		return -1;
3277
3278	for (i = 0; i < nr_pmu_caps; i++) {
3279		name = do_read_string(ff);
3280		if (!name)
3281			goto error;
3282
3283		value = do_read_string(ff);
3284		if (!value)
3285			goto free_name;
3286
3287		if (asprintf(&ptr, "%s=%s", name, value) < 0)
3288			goto free_value;
3289
3290		(*caps)[i] = ptr;
3291
3292		if (!strcmp(name, "branches"))
3293			*max_branches = atoi(value);
3294
3295		if (!strcmp(name, "branch_counter_nr"))
3296			*br_cntr_nr = atoi(value);
3297
3298		if (!strcmp(name, "branch_counter_width"))
3299			*br_cntr_width = atoi(value);
3300
3301		free(value);
3302		free(name);
3303	}
3304	*nr_caps = nr_pmu_caps;
3305	return 0;
3306
3307free_value:
3308	free(value);
3309free_name:
3310	free(name);
3311error:
3312	for (; i > 0; i--)
3313		free((*caps)[i - 1]);
3314	free(*caps);
3315	*caps = NULL;
3316	*nr_caps = 0;
3317	return -1;
3318}
3319
3320static int process_cpu_pmu_caps(struct feat_fd *ff,
3321				void *data __maybe_unused)
3322{
3323	struct perf_env *env = &ff->ph->env;
3324	int ret = __process_pmu_caps(ff, &env->nr_cpu_pmu_caps,
3325				     &env->cpu_pmu_caps,
3326				     &env->max_branches,
3327				     &env->br_cntr_nr,
3328				     &env->br_cntr_width);
3329
3330	if (!ret && !env->cpu_pmu_caps)
3331		pr_debug("cpu pmu capabilities not available\n");
3332	return ret;
3333}
3334
3335static int process_pmu_caps(struct feat_fd *ff, void *data __maybe_unused)
3336{
3337	struct perf_env *env = &ff->ph->env;
3338	struct pmu_caps *pmu_caps;
3339	u32 nr_pmu, i;
3340	int ret;
3341	int j;
3342
3343	if (do_read_u32(ff, &nr_pmu))
3344		return -1;
3345
3346	if (!nr_pmu) {
3347		pr_debug("pmu capabilities not available\n");
3348		return 0;
3349	}
3350
3351	pmu_caps = zalloc(sizeof(*pmu_caps) * nr_pmu);
3352	if (!pmu_caps)
3353		return -ENOMEM;
3354
3355	for (i = 0; i < nr_pmu; i++) {
3356		ret = __process_pmu_caps(ff, &pmu_caps[i].nr_caps,
3357					 &pmu_caps[i].caps,
3358					 &pmu_caps[i].max_branches,
3359					 &pmu_caps[i].br_cntr_nr,
3360					 &pmu_caps[i].br_cntr_width);
3361		if (ret)
3362			goto err;
3363
3364		pmu_caps[i].pmu_name = do_read_string(ff);
3365		if (!pmu_caps[i].pmu_name) {
3366			ret = -1;
3367			goto err;
3368		}
3369		if (!pmu_caps[i].nr_caps) {
3370			pr_debug("%s pmu capabilities not available\n",
3371				 pmu_caps[i].pmu_name);
3372		}
3373	}
3374
3375	env->nr_pmus_with_caps = nr_pmu;
3376	env->pmu_caps = pmu_caps;
3377	return 0;
3378
3379err:
3380	for (i = 0; i < nr_pmu; i++) {
3381		for (j = 0; j < pmu_caps[i].nr_caps; j++)
3382			free(pmu_caps[i].caps[j]);
3383		free(pmu_caps[i].caps);
3384		free(pmu_caps[i].pmu_name);
3385	}
3386
3387	free(pmu_caps);
3388	return ret;
3389}
3390
3391#define FEAT_OPR(n, func, __full_only) \
3392	[HEADER_##n] = {					\
3393		.name	    = __stringify(n),			\
3394		.write	    = write_##func,			\
3395		.print	    = print_##func,			\
3396		.full_only  = __full_only,			\
3397		.process    = process_##func,			\
3398		.synthesize = true				\
3399	}
3400
3401#define FEAT_OPN(n, func, __full_only) \
3402	[HEADER_##n] = {					\
3403		.name	    = __stringify(n),			\
3404		.write	    = write_##func,			\
3405		.print	    = print_##func,			\
3406		.full_only  = __full_only,			\
3407		.process    = process_##func			\
3408	}
3409
3410/* feature_ops not implemented: */
3411#define print_tracing_data	NULL
3412#define print_build_id		NULL
3413
3414#define process_branch_stack	NULL
3415#define process_stat		NULL
3416
3417// Only used in util/synthetic-events.c
3418const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
3419
3420const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = {
3421#ifdef HAVE_LIBTRACEEVENT
3422	FEAT_OPN(TRACING_DATA,	tracing_data,	false),
3423#endif
3424	FEAT_OPN(BUILD_ID,	build_id,	false),
3425	FEAT_OPR(HOSTNAME,	hostname,	false),
3426	FEAT_OPR(OSRELEASE,	osrelease,	false),
3427	FEAT_OPR(VERSION,	version,	false),
3428	FEAT_OPR(ARCH,		arch,		false),
3429	FEAT_OPR(NRCPUS,	nrcpus,		false),
3430	FEAT_OPR(CPUDESC,	cpudesc,	false),
3431	FEAT_OPR(CPUID,		cpuid,		false),
3432	FEAT_OPR(TOTAL_MEM,	total_mem,	false),
3433	FEAT_OPR(EVENT_DESC,	event_desc,	false),
3434	FEAT_OPR(CMDLINE,	cmdline,	false),
3435	FEAT_OPR(CPU_TOPOLOGY,	cpu_topology,	true),
3436	FEAT_OPR(NUMA_TOPOLOGY,	numa_topology,	true),
3437	FEAT_OPN(BRANCH_STACK,	branch_stack,	false),
3438	FEAT_OPR(PMU_MAPPINGS,	pmu_mappings,	false),
3439	FEAT_OPR(GROUP_DESC,	group_desc,	false),
3440	FEAT_OPN(AUXTRACE,	auxtrace,	false),
3441	FEAT_OPN(STAT,		stat,		false),
3442	FEAT_OPN(CACHE,		cache,		true),
3443	FEAT_OPR(SAMPLE_TIME,	sample_time,	false),
3444	FEAT_OPR(MEM_TOPOLOGY,	mem_topology,	true),
3445	FEAT_OPR(CLOCKID,	clockid,	false),
3446	FEAT_OPN(DIR_FORMAT,	dir_format,	false),
3447#ifdef HAVE_LIBBPF_SUPPORT
3448	FEAT_OPR(BPF_PROG_INFO, bpf_prog_info,  false),
3449	FEAT_OPR(BPF_BTF,       bpf_btf,        false),
3450#endif
3451	FEAT_OPR(COMPRESSED,	compressed,	false),
3452	FEAT_OPR(CPU_PMU_CAPS,	cpu_pmu_caps,	false),
3453	FEAT_OPR(CLOCK_DATA,	clock_data,	false),
3454	FEAT_OPN(HYBRID_TOPOLOGY,	hybrid_topology,	true),
3455	FEAT_OPR(PMU_CAPS,	pmu_caps,	false),
3456};
3457
3458struct header_print_data {
3459	FILE *fp;
3460	bool full; /* extended list of headers */
3461};
3462
3463static int perf_file_section__fprintf_info(struct perf_file_section *section,
3464					   struct perf_header *ph,
3465					   int feat, int fd, void *data)
3466{
3467	struct header_print_data *hd = data;
3468	struct feat_fd ff;
3469
3470	if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
3471		pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
3472				"%d, continuing...\n", section->offset, feat);
3473		return 0;
3474	}
3475	if (feat >= HEADER_LAST_FEATURE) {
3476		pr_warning("unknown feature %d\n", feat);
3477		return 0;
3478	}
3479	if (!feat_ops[feat].print)
3480		return 0;
3481
3482	ff = (struct  feat_fd) {
3483		.fd = fd,
3484		.ph = ph,
3485	};
3486
3487	if (!feat_ops[feat].full_only || hd->full)
3488		feat_ops[feat].print(&ff, hd->fp);
3489	else
3490		fprintf(hd->fp, "# %s info available, use -I to display\n",
3491			feat_ops[feat].name);
3492
3493	return 0;
3494}
3495
3496int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
3497{
3498	struct header_print_data hd;
3499	struct perf_header *header = &session->header;
3500	int fd = perf_data__fd(session->data);
3501	struct stat st;
3502	time_t stctime;
3503	int ret, bit;
3504
3505	hd.fp = fp;
3506	hd.full = full;
3507
3508	ret = fstat(fd, &st);
3509	if (ret == -1)
3510		return -1;
3511
3512	stctime = st.st_mtime;
3513	fprintf(fp, "# captured on    : %s", ctime(&stctime));
3514
3515	fprintf(fp, "# header version : %u\n", header->version);
3516	fprintf(fp, "# data offset    : %" PRIu64 "\n", header->data_offset);
3517	fprintf(fp, "# data size      : %" PRIu64 "\n", header->data_size);
3518	fprintf(fp, "# feat offset    : %" PRIu64 "\n", header->feat_offset);
3519
3520	perf_header__process_sections(header, fd, &hd,
3521				      perf_file_section__fprintf_info);
3522
3523	if (session->data->is_pipe)
3524		return 0;
3525
3526	fprintf(fp, "# missing features: ");
3527	for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {
3528		if (bit)
3529			fprintf(fp, "%s ", feat_ops[bit].name);
3530	}
3531
3532	fprintf(fp, "\n");
3533	return 0;
3534}
3535
3536struct header_fw {
3537	struct feat_writer	fw;
3538	struct feat_fd		*ff;
3539};
3540
3541static int feat_writer_cb(struct feat_writer *fw, void *buf, size_t sz)
3542{
3543	struct header_fw *h = container_of(fw, struct header_fw, fw);
3544
3545	return do_write(h->ff, buf, sz);
3546}
3547
3548static int do_write_feat(struct feat_fd *ff, int type,
3549			 struct perf_file_section **p,
3550			 struct evlist *evlist,
3551			 struct feat_copier *fc)
3552{
3553	int err;
3554	int ret = 0;
3555
3556	if (perf_header__has_feat(ff->ph, type)) {
3557		if (!feat_ops[type].write)
3558			return -1;
3559
3560		if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
3561			return -1;
3562
3563		(*p)->offset = lseek(ff->fd, 0, SEEK_CUR);
3564
3565		/*
3566		 * Hook to let perf inject copy features sections from the input
3567		 * file.
3568		 */
3569		if (fc && fc->copy) {
3570			struct header_fw h = {
3571				.fw.write = feat_writer_cb,
3572				.ff = ff,
3573			};
3574
3575			/* ->copy() returns 0 if the feature was not copied */
3576			err = fc->copy(fc, type, &h.fw);
3577		} else {
3578			err = 0;
3579		}
3580		if (!err)
3581			err = feat_ops[type].write(ff, evlist);
3582		if (err < 0) {
3583			pr_debug("failed to write feature %s\n", feat_ops[type].name);
3584
3585			/* undo anything written */
3586			lseek(ff->fd, (*p)->offset, SEEK_SET);
3587
3588			return -1;
3589		}
3590		(*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;
3591		(*p)++;
3592	}
3593	return ret;
3594}
3595
3596static int perf_header__adds_write(struct perf_header *header,
3597				   struct evlist *evlist, int fd,
3598				   struct feat_copier *fc)
3599{
3600	int nr_sections;
3601	struct feat_fd ff = {
3602		.fd  = fd,
3603		.ph = header,
3604	};
3605	struct perf_file_section *feat_sec, *p;
3606	int sec_size;
3607	u64 sec_start;
3608	int feat;
3609	int err;
3610
3611	nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
3612	if (!nr_sections)
3613		return 0;
3614
3615	feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
3616	if (feat_sec == NULL)
3617		return -ENOMEM;
3618
3619	sec_size = sizeof(*feat_sec) * nr_sections;
3620
3621	sec_start = header->feat_offset;
3622	lseek(fd, sec_start + sec_size, SEEK_SET);
3623
3624	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
3625		if (do_write_feat(&ff, feat, &p, evlist, fc))
3626			perf_header__clear_feat(header, feat);
3627	}
3628
3629	lseek(fd, sec_start, SEEK_SET);
3630	/*
3631	 * may write more than needed due to dropped feature, but
3632	 * this is okay, reader will skip the missing entries
3633	 */
3634	err = do_write(&ff, feat_sec, sec_size);
3635	if (err < 0)
3636		pr_debug("failed to write feature section\n");
3637	free(ff.buf); /* TODO: added to silence clang-tidy. */
3638	free(feat_sec);
3639	return err;
3640}
3641
3642int perf_header__write_pipe(int fd)
3643{
3644	struct perf_pipe_file_header f_header;
3645	struct feat_fd ff = {
3646		.fd = fd,
3647	};
3648	int err;
3649
3650	f_header = (struct perf_pipe_file_header){
3651		.magic	   = PERF_MAGIC,
3652		.size	   = sizeof(f_header),
3653	};
3654
3655	err = do_write(&ff, &f_header, sizeof(f_header));
3656	if (err < 0) {
3657		pr_debug("failed to write perf pipe header\n");
3658		return err;
3659	}
3660	free(ff.buf);
3661	return 0;
3662}
3663
3664static int perf_session__do_write_header(struct perf_session *session,
3665					 struct evlist *evlist,
3666					 int fd, bool at_exit,
3667					 struct feat_copier *fc,
3668					 bool write_attrs_after_data)
3669{
3670	struct perf_file_header f_header;
3671	struct perf_header *header = &session->header;
3672	struct evsel *evsel;
3673	struct feat_fd ff = {
3674		.ph = header,
3675		.fd = fd,
3676	};
3677	u64 attr_offset = sizeof(f_header), attr_size = 0;
3678	int err;
3679
3680	if (write_attrs_after_data && at_exit) {
3681		/*
3682		 * Write features at the end of the file first so that
3683		 * attributes may come after them.
3684		 */
3685		if (!header->data_offset && header->data_size) {
3686			pr_err("File contains data but offset unknown\n");
3687			err = -1;
3688			goto err_out;
3689		}
3690		header->feat_offset = header->data_offset + header->data_size;
3691		err = perf_header__adds_write(header, evlist, fd, fc);
3692		if (err < 0)
3693			goto err_out;
3694		attr_offset = lseek(fd, 0, SEEK_CUR);
3695	} else {
3696		lseek(fd, attr_offset, SEEK_SET);
3697	}
3698
3699	evlist__for_each_entry(session->evlist, evsel) {
3700		evsel->id_offset = attr_offset;
3701		/* Avoid writing at the end of the file until the session is exiting. */
3702		if (!write_attrs_after_data || at_exit) {
3703			err = do_write(&ff, evsel->core.id, evsel->core.ids * sizeof(u64));
3704			if (err < 0) {
3705				pr_debug("failed to write perf header\n");
3706				goto err_out;
3707			}
3708		}
3709		attr_offset += evsel->core.ids * sizeof(u64);
3710	}
3711
3712	evlist__for_each_entry(evlist, evsel) {
3713		if (evsel->core.attr.size < sizeof(evsel->core.attr)) {
3714			/*
3715			 * We are likely in "perf inject" and have read
3716			 * from an older file. Update attr size so that
3717			 * reader gets the right offset to the ids.
3718			 */
3719			evsel->core.attr.size = sizeof(evsel->core.attr);
3720		}
3721		/* Avoid writing at the end of the file until the session is exiting. */
3722		if (!write_attrs_after_data || at_exit) {
3723			struct perf_file_attr f_attr = {
3724				.attr = evsel->core.attr,
3725				.ids  = {
3726					.offset = evsel->id_offset,
3727					.size   = evsel->core.ids * sizeof(u64),
3728				}
3729			};
3730			err = do_write(&ff, &f_attr, sizeof(f_attr));
3731			if (err < 0) {
3732				pr_debug("failed to write perf header attribute\n");
3733				goto err_out;
3734			}
3735		}
3736		attr_size += sizeof(struct perf_file_attr);
3737	}
3738
3739	if (!header->data_offset) {
3740		if (write_attrs_after_data)
3741			header->data_offset = sizeof(f_header);
3742		else
3743			header->data_offset = attr_offset + attr_size;
3744	}
3745	header->feat_offset = header->data_offset + header->data_size;
3746
3747	if (!write_attrs_after_data && at_exit) {
3748		/* Write features now feat_offset is known. */
3749		err = perf_header__adds_write(header, evlist, fd, fc);
3750		if (err < 0)
3751			goto err_out;
3752	}
3753
3754	f_header = (struct perf_file_header){
3755		.magic	   = PERF_MAGIC,
3756		.size	   = sizeof(f_header),
3757		.attr_size = sizeof(struct perf_file_attr),
3758		.attrs = {
3759			.offset = attr_offset,
3760			.size   = attr_size,
3761		},
3762		.data = {
3763			.offset = header->data_offset,
3764			.size	= header->data_size,
3765		},
3766		/* event_types is ignored, store zeros */
3767	};
3768
3769	memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
3770
3771	lseek(fd, 0, SEEK_SET);
3772	err = do_write(&ff, &f_header, sizeof(f_header));
3773	if (err < 0) {
3774		pr_debug("failed to write perf header\n");
3775		goto err_out;
3776	} else {
3777		lseek(fd, 0, SEEK_END);
3778		err = 0;
3779	}
3780err_out:
3781	free(ff.buf);
3782	return err;
3783}
3784
3785int perf_session__write_header(struct perf_session *session,
3786			       struct evlist *evlist,
3787			       int fd, bool at_exit)
3788{
3789	return perf_session__do_write_header(session, evlist, fd, at_exit, /*fc=*/NULL,
3790					     /*write_attrs_after_data=*/false);
3791}
3792
3793size_t perf_session__data_offset(const struct evlist *evlist)
3794{
3795	struct evsel *evsel;
3796	size_t data_offset;
3797
3798	data_offset = sizeof(struct perf_file_header);
3799	evlist__for_each_entry(evlist, evsel) {
3800		data_offset += evsel->core.ids * sizeof(u64);
3801	}
3802	data_offset += evlist->core.nr_entries * sizeof(struct perf_file_attr);
3803
3804	return data_offset;
3805}
3806
3807int perf_session__inject_header(struct perf_session *session,
3808				struct evlist *evlist,
3809				int fd,
3810				struct feat_copier *fc,
3811				bool write_attrs_after_data)
3812{
3813	return perf_session__do_write_header(session, evlist, fd, true, fc,
3814					     write_attrs_after_data);
3815}
3816
3817static int perf_header__getbuffer64(struct perf_header *header,
3818				    int fd, void *buf, size_t size)
3819{
3820	if (readn(fd, buf, size) <= 0)
3821		return -1;
3822
3823	if (header->needs_swap)
3824		mem_bswap_64(buf, size);
3825
3826	return 0;
3827}
3828
3829int perf_header__process_sections(struct perf_header *header, int fd,
3830				  void *data,
3831				  int (*process)(struct perf_file_section *section,
3832						 struct perf_header *ph,
3833						 int feat, int fd, void *data))
3834{
3835	struct perf_file_section *feat_sec, *sec;
3836	int nr_sections;
3837	int sec_size;
3838	int feat;
3839	int err;
3840
3841	nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
3842	if (!nr_sections)
3843		return 0;
3844
3845	feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
3846	if (!feat_sec)
3847		return -1;
3848
3849	sec_size = sizeof(*feat_sec) * nr_sections;
3850
3851	lseek(fd, header->feat_offset, SEEK_SET);
3852
3853	err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
3854	if (err < 0)
3855		goto out_free;
3856
3857	for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
3858		err = process(sec++, header, feat, fd, data);
3859		if (err < 0)
3860			goto out_free;
3861	}
3862	err = 0;
3863out_free:
3864	free(feat_sec);
3865	return err;
3866}
3867
3868static const int attr_file_abi_sizes[] = {
3869	[0] = PERF_ATTR_SIZE_VER0,
3870	[1] = PERF_ATTR_SIZE_VER1,
3871	[2] = PERF_ATTR_SIZE_VER2,
3872	[3] = PERF_ATTR_SIZE_VER3,
3873	[4] = PERF_ATTR_SIZE_VER4,
3874	0,
3875};
3876
3877/*
3878 * In the legacy file format, the magic number is not used to encode endianness.
3879 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
3880 * on ABI revisions, we need to try all combinations for all endianness to
3881 * detect the endianness.
3882 */
3883static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
3884{
3885	uint64_t ref_size, attr_size;
3886	int i;
3887
3888	for (i = 0 ; attr_file_abi_sizes[i]; i++) {
3889		ref_size = attr_file_abi_sizes[i]
3890			 + sizeof(struct perf_file_section);
3891		if (hdr_sz != ref_size) {
3892			attr_size = bswap_64(hdr_sz);
3893			if (attr_size != ref_size)
3894				continue;
3895
3896			ph->needs_swap = true;
3897		}
3898		pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
3899			 i,
3900			 ph->needs_swap);
3901		return 0;
3902	}
3903	/* could not determine endianness */
3904	return -1;
3905}
3906
3907#define PERF_PIPE_HDR_VER0	16
3908
3909static const size_t attr_pipe_abi_sizes[] = {
3910	[0] = PERF_PIPE_HDR_VER0,
3911	0,
3912};
3913
3914/*
3915 * In the legacy pipe format, there is an implicit assumption that endianness
3916 * between host recording the samples, and host parsing the samples is the
3917 * same. This is not always the case given that the pipe output may always be
3918 * redirected into a file and analyzed on a different machine with possibly a
3919 * different endianness and perf_event ABI revisions in the perf tool itself.
3920 */
3921static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
3922{
3923	u64 attr_size;
3924	int i;
3925
3926	for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
3927		if (hdr_sz != attr_pipe_abi_sizes[i]) {
3928			attr_size = bswap_64(hdr_sz);
3929			if (attr_size != hdr_sz)
3930				continue;
3931
3932			ph->needs_swap = true;
3933		}
3934		pr_debug("Pipe ABI%d perf.data file detected\n", i);
3935		return 0;
3936	}
3937	return -1;
3938}
3939
3940bool is_perf_magic(u64 magic)
3941{
3942	if (!memcmp(&magic, __perf_magic1, sizeof(magic))
3943		|| magic == __perf_magic2
3944		|| magic == __perf_magic2_sw)
3945		return true;
3946
3947	return false;
3948}
3949
3950static int check_magic_endian(u64 magic, uint64_t hdr_sz,
3951			      bool is_pipe, struct perf_header *ph)
3952{
3953	int ret;
3954
3955	/* check for legacy format */
3956	ret = memcmp(&magic, __perf_magic1, sizeof(magic));
3957	if (ret == 0) {
3958		ph->version = PERF_HEADER_VERSION_1;
3959		pr_debug("legacy perf.data format\n");
3960		if (is_pipe)
3961			return try_all_pipe_abis(hdr_sz, ph);
3962
3963		return try_all_file_abis(hdr_sz, ph);
3964	}
3965	/*
3966	 * the new magic number serves two purposes:
3967	 * - unique number to identify actual perf.data files
3968	 * - encode endianness of file
3969	 */
3970	ph->version = PERF_HEADER_VERSION_2;
3971
3972	/* check magic number with one endianness */
3973	if (magic == __perf_magic2)
3974		return 0;
3975
3976	/* check magic number with opposite endianness */
3977	if (magic != __perf_magic2_sw)
3978		return -1;
3979
3980	ph->needs_swap = true;
3981
3982	return 0;
3983}
3984
3985int perf_file_header__read(struct perf_file_header *header,
3986			   struct perf_header *ph, int fd)
3987{
3988	ssize_t ret;
3989
3990	lseek(fd, 0, SEEK_SET);
3991
3992	ret = readn(fd, header, sizeof(*header));
3993	if (ret <= 0)
3994		return -1;
3995
3996	if (check_magic_endian(header->magic,
3997			       header->attr_size, false, ph) < 0) {
3998		pr_debug("magic/endian check failed\n");
3999		return -1;
4000	}
4001
4002	if (ph->needs_swap) {
4003		mem_bswap_64(header, offsetof(struct perf_file_header,
4004			     adds_features));
4005	}
4006
4007	if (header->size > header->attrs.offset) {
4008		pr_err("Perf file header corrupt: header overlaps attrs\n");
4009		return -1;
4010	}
4011
4012	if (header->size > header->data.offset) {
4013		pr_err("Perf file header corrupt: header overlaps data\n");
4014		return -1;
4015	}
4016
4017	if ((header->attrs.offset <= header->data.offset &&
4018	     header->attrs.offset + header->attrs.size > header->data.offset) ||
4019	    (header->attrs.offset > header->data.offset &&
4020	     header->data.offset + header->data.size > header->attrs.offset)) {
4021		pr_err("Perf file header corrupt: Attributes and data overlap\n");
4022		return -1;
4023	}
4024
4025	if (header->size != sizeof(*header)) {
4026		/* Support the previous format */
4027		if (header->size == offsetof(typeof(*header), adds_features))
4028			bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
4029		else
4030			return -1;
4031	} else if (ph->needs_swap) {
4032		/*
4033		 * feature bitmap is declared as an array of unsigned longs --
4034		 * not good since its size can differ between the host that
4035		 * generated the data file and the host analyzing the file.
4036		 *
4037		 * We need to handle endianness, but we don't know the size of
4038		 * the unsigned long where the file was generated. Take a best
4039		 * guess at determining it: try 64-bit swap first (ie., file
4040		 * created on a 64-bit host), and check if the hostname feature
4041		 * bit is set (this feature bit is forced on as of fbe96f2).
4042		 * If the bit is not, undo the 64-bit swap and try a 32-bit
4043		 * swap. If the hostname bit is still not set (e.g., older data
4044		 * file), punt and fallback to the original behavior --
4045		 * clearing all feature bits and setting buildid.
4046		 */
4047		mem_bswap_64(&header->adds_features,
4048			    BITS_TO_U64(HEADER_FEAT_BITS));
4049
4050		if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
4051			/* unswap as u64 */
4052			mem_bswap_64(&header->adds_features,
4053				    BITS_TO_U64(HEADER_FEAT_BITS));
4054
4055			/* unswap as u32 */
4056			mem_bswap_32(&header->adds_features,
4057				    BITS_TO_U32(HEADER_FEAT_BITS));
4058		}
4059
4060		if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
4061			bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
4062			__set_bit(HEADER_BUILD_ID, header->adds_features);
4063		}
4064	}
4065
4066	memcpy(&ph->adds_features, &header->adds_features,
4067	       sizeof(ph->adds_features));
4068
4069	ph->data_offset  = header->data.offset;
4070	ph->data_size	 = header->data.size;
4071	ph->feat_offset  = header->data.offset + header->data.size;
4072	return 0;
4073}
4074
4075static int perf_file_section__process(struct perf_file_section *section,
4076				      struct perf_header *ph,
4077				      int feat, int fd, void *data)
4078{
4079	struct feat_fd fdd = {
4080		.fd	= fd,
4081		.ph	= ph,
4082		.size	= section->size,
4083		.offset	= section->offset,
4084	};
4085
4086	if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
4087		pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
4088			  "%d, continuing...\n", section->offset, feat);
4089		return 0;
4090	}
4091
4092	if (feat >= HEADER_LAST_FEATURE) {
4093		pr_debug("unknown feature %d, continuing...\n", feat);
4094		return 0;
4095	}
4096
4097	if (!feat_ops[feat].process)
4098		return 0;
4099
4100	return feat_ops[feat].process(&fdd, data);
4101}
4102
4103static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
4104				       struct perf_header *ph,
4105				       struct perf_data *data)
4106{
4107	ssize_t ret;
4108
4109	ret = perf_data__read(data, header, sizeof(*header));
4110	if (ret <= 0)
4111		return -1;
4112
4113	if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
4114		pr_debug("endian/magic failed\n");
4115		return -1;
4116	}
4117
4118	if (ph->needs_swap)
4119		header->size = bswap_64(header->size);
4120
4121	return 0;
4122}
4123
4124static int perf_header__read_pipe(struct perf_session *session)
4125{
4126	struct perf_header *header = &session->header;
4127	struct perf_pipe_file_header f_header;
4128
4129	if (perf_file_header__read_pipe(&f_header, header, session->data) < 0) {
4130		pr_debug("incompatible file format\n");
4131		return -EINVAL;
4132	}
4133
4134	return f_header.size == sizeof(f_header) ? 0 : -1;
4135}
4136
4137static int read_attr(int fd, struct perf_header *ph,
4138		     struct perf_file_attr *f_attr)
4139{
4140	struct perf_event_attr *attr = &f_attr->attr;
4141	size_t sz, left;
4142	size_t our_sz = sizeof(f_attr->attr);
4143	ssize_t ret;
4144
4145	memset(f_attr, 0, sizeof(*f_attr));
4146
4147	/* read minimal guaranteed structure */
4148	ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
4149	if (ret <= 0) {
4150		pr_debug("cannot read %d bytes of header attr\n",
4151			 PERF_ATTR_SIZE_VER0);
4152		return -1;
4153	}
4154
4155	/* on file perf_event_attr size */
4156	sz = attr->size;
4157
4158	if (ph->needs_swap)
4159		sz = bswap_32(sz);
4160
4161	if (sz == 0) {
4162		/* assume ABI0 */
4163		sz =  PERF_ATTR_SIZE_VER0;
4164	} else if (sz > our_sz) {
4165		pr_debug("file uses a more recent and unsupported ABI"
4166			 " (%zu bytes extra)\n", sz - our_sz);
4167		return -1;
4168	}
4169	/* what we have not yet read and that we know about */
4170	left = sz - PERF_ATTR_SIZE_VER0;
4171	if (left) {
4172		void *ptr = attr;
4173		ptr += PERF_ATTR_SIZE_VER0;
4174
4175		ret = readn(fd, ptr, left);
4176	}
4177	/* read perf_file_section, ids are read in caller */
4178	ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
4179
4180	return ret <= 0 ? -1 : 0;
4181}
4182
4183#ifdef HAVE_LIBTRACEEVENT
4184static int evsel__prepare_tracepoint_event(struct evsel *evsel, struct tep_handle *pevent)
4185{
4186	struct tep_event *event;
4187	char bf[128];
4188
4189	/* already prepared */
4190	if (evsel->tp_format)
4191		return 0;
4192
4193	if (pevent == NULL) {
4194		pr_debug("broken or missing trace data\n");
4195		return -1;
4196	}
4197
4198	event = tep_find_event(pevent, evsel->core.attr.config);
4199	if (event == NULL) {
4200		pr_debug("cannot find event format for %d\n", (int)evsel->core.attr.config);
4201		return -1;
4202	}
4203
4204	if (!evsel->name) {
4205		snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
4206		evsel->name = strdup(bf);
4207		if (evsel->name == NULL)
4208			return -1;
4209	}
4210
4211	evsel->tp_format = event;
4212	return 0;
4213}
4214
4215static int evlist__prepare_tracepoint_events(struct evlist *evlist, struct tep_handle *pevent)
4216{
4217	struct evsel *pos;
4218
4219	evlist__for_each_entry(evlist, pos) {
4220		if (pos->core.attr.type == PERF_TYPE_TRACEPOINT &&
4221		    evsel__prepare_tracepoint_event(pos, pevent))
4222			return -1;
4223	}
4224
4225	return 0;
4226}
4227#endif
4228
4229int perf_session__read_header(struct perf_session *session)
4230{
4231	struct perf_data *data = session->data;
4232	struct perf_header *header = &session->header;
4233	struct perf_file_header	f_header;
4234	struct perf_file_attr	f_attr;
4235	u64			f_id;
4236	int nr_attrs, nr_ids, i, j, err;
4237	int fd = perf_data__fd(data);
4238
4239	session->evlist = evlist__new();
4240	if (session->evlist == NULL)
4241		return -ENOMEM;
4242
4243	session->evlist->session = session;
4244	session->machines.host.env = &header->env;
4245
4246	/*
4247	 * We can read 'pipe' data event from regular file,
4248	 * check for the pipe header regardless of source.
4249	 */
4250	err = perf_header__read_pipe(session);
4251	if (!err || perf_data__is_pipe(data)) {
4252		data->is_pipe = true;
4253		return err;
4254	}
4255
4256	if (perf_file_header__read(&f_header, header, fd) < 0)
4257		return -EINVAL;
4258
4259	if (header->needs_swap && data->in_place_update) {
4260		pr_err("In-place update not supported when byte-swapping is required\n");
4261		return -EINVAL;
4262	}
4263
4264	/*
4265	 * Sanity check that perf.data was written cleanly; data size is
4266	 * initialized to 0 and updated only if the on_exit function is run.
4267	 * If data size is still 0 then the file contains only partial
4268	 * information.  Just warn user and process it as much as it can.
4269	 */
4270	if (f_header.data.size == 0) {
4271		pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
4272			   "Was the 'perf record' command properly terminated?\n",
4273			   data->file.path);
4274	}
4275
4276	if (f_header.attr_size == 0) {
4277		pr_err("ERROR: The %s file's attr size field is 0 which is unexpected.\n"
4278		       "Was the 'perf record' command properly terminated?\n",
4279		       data->file.path);
4280		return -EINVAL;
4281	}
4282
4283	nr_attrs = f_header.attrs.size / f_header.attr_size;
4284	lseek(fd, f_header.attrs.offset, SEEK_SET);
4285
4286	for (i = 0; i < nr_attrs; i++) {
4287		struct evsel *evsel;
4288		off_t tmp;
4289
4290		if (read_attr(fd, header, &f_attr) < 0)
4291			goto out_errno;
4292
4293		if (header->needs_swap) {
4294			f_attr.ids.size   = bswap_64(f_attr.ids.size);
4295			f_attr.ids.offset = bswap_64(f_attr.ids.offset);
4296			perf_event__attr_swap(&f_attr.attr);
4297		}
4298
4299		tmp = lseek(fd, 0, SEEK_CUR);
4300		evsel = evsel__new(&f_attr.attr);
4301
4302		if (evsel == NULL)
4303			goto out_delete_evlist;
4304
4305		evsel->needs_swap = header->needs_swap;
4306		/*
4307		 * Do it before so that if perf_evsel__alloc_id fails, this
4308		 * entry gets purged too at evlist__delete().
4309		 */
4310		evlist__add(session->evlist, evsel);
4311
4312		nr_ids = f_attr.ids.size / sizeof(u64);
4313		/*
4314		 * We don't have the cpu and thread maps on the header, so
4315		 * for allocating the perf_sample_id table we fake 1 cpu and
4316		 * hattr->ids threads.
4317		 */
4318		if (perf_evsel__alloc_id(&evsel->core, 1, nr_ids))
4319			goto out_delete_evlist;
4320
4321		lseek(fd, f_attr.ids.offset, SEEK_SET);
4322
4323		for (j = 0; j < nr_ids; j++) {
4324			if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
4325				goto out_errno;
4326
4327			perf_evlist__id_add(&session->evlist->core, &evsel->core, 0, j, f_id);
4328		}
4329
4330		lseek(fd, tmp, SEEK_SET);
4331	}
4332
4333#ifdef HAVE_LIBTRACEEVENT
4334	perf_header__process_sections(header, fd, &session->tevent,
4335				      perf_file_section__process);
4336
4337	if (evlist__prepare_tracepoint_events(session->evlist, session->tevent.pevent))
4338		goto out_delete_evlist;
4339#else
4340	perf_header__process_sections(header, fd, NULL, perf_file_section__process);
4341#endif
4342
4343	return 0;
4344out_errno:
4345	return -errno;
4346
4347out_delete_evlist:
4348	evlist__delete(session->evlist);
4349	session->evlist = NULL;
4350	return -ENOMEM;
4351}
4352
4353int perf_event__process_feature(struct perf_session *session,
4354				union perf_event *event)
4355{
4356	struct feat_fd ff = { .fd = 0 };
4357	struct perf_record_header_feature *fe = (struct perf_record_header_feature *)event;
4358	int type = fe->header.type;
4359	u64 feat = fe->feat_id;
4360	int ret = 0;
4361	bool print = dump_trace;
4362
4363	if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {
4364		pr_warning("invalid record type %d in pipe-mode\n", type);
4365		return 0;
4366	}
4367	if (feat == HEADER_RESERVED || feat >= HEADER_LAST_FEATURE) {
4368		pr_warning("invalid record type %d in pipe-mode\n", type);
4369		return -1;
4370	}
4371
4372	ff.buf  = (void *)fe->data;
4373	ff.size = event->header.size - sizeof(*fe);
4374	ff.ph = &session->header;
4375
4376	if (feat_ops[feat].process && feat_ops[feat].process(&ff, NULL)) {
4377		ret = -1;
4378		goto out;
4379	}
4380
4381	if (session->tool->show_feat_hdr) {
4382		if (!feat_ops[feat].full_only ||
4383		    session->tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {
4384			print = true;
4385		} else {
4386			fprintf(stdout, "# %s info available, use -I to display\n",
4387				feat_ops[feat].name);
4388		}
4389	}
4390
4391	if (dump_trace)
4392		printf(", ");
4393
4394	if (print) {
4395		if (feat_ops[feat].print)
4396			feat_ops[feat].print(&ff, stdout);
4397		else
4398			printf("# %s", feat_ops[feat].name);
4399	}
4400
4401out:
4402	free_event_desc(ff.events);
4403	return ret;
4404}
4405
4406size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
4407{
4408	struct perf_record_event_update *ev = &event->event_update;
4409	struct perf_cpu_map *map;
4410	size_t ret;
4411
4412	ret = fprintf(fp, "\n... id:    %" PRI_lu64 "\n", ev->id);
4413
4414	switch (ev->type) {
4415	case PERF_EVENT_UPDATE__SCALE:
4416		ret += fprintf(fp, "... scale: %f\n", ev->scale.scale);
4417		break;
4418	case PERF_EVENT_UPDATE__UNIT:
4419		ret += fprintf(fp, "... unit:  %s\n", ev->unit);
4420		break;
4421	case PERF_EVENT_UPDATE__NAME:
4422		ret += fprintf(fp, "... name:  %s\n", ev->name);
4423		break;
4424	case PERF_EVENT_UPDATE__CPUS:
4425		ret += fprintf(fp, "... ");
4426
4427		map = cpu_map__new_data(&ev->cpus.cpus);
4428		if (map) {
4429			ret += cpu_map__fprintf(map, fp);
4430			perf_cpu_map__put(map);
4431		} else
4432			ret += fprintf(fp, "failed to get cpus\n");
4433		break;
4434	default:
4435		ret += fprintf(fp, "... unknown type\n");
4436		break;
4437	}
4438
4439	return ret;
4440}
4441
4442size_t perf_event__fprintf_attr(union perf_event *event, FILE *fp)
4443{
4444	return perf_event_attr__fprintf(fp, &event->attr.attr, __desc_attr__fprintf, NULL);
4445}
4446
4447int perf_event__process_attr(const struct perf_tool *tool __maybe_unused,
4448			     union perf_event *event,
4449			     struct evlist **pevlist)
4450{
4451	u32 i, n_ids;
4452	u64 *ids;
4453	struct evsel *evsel;
4454	struct evlist *evlist = *pevlist;
4455
4456	if (dump_trace)
4457		perf_event__fprintf_attr(event, stdout);
4458
4459	if (evlist == NULL) {
4460		*pevlist = evlist = evlist__new();
4461		if (evlist == NULL)
4462			return -ENOMEM;
4463	}
4464
4465	evsel = evsel__new(&event->attr.attr);
4466	if (evsel == NULL)
4467		return -ENOMEM;
4468
4469	evlist__add(evlist, evsel);
4470
4471	n_ids = event->header.size - sizeof(event->header) - event->attr.attr.size;
4472	n_ids = n_ids / sizeof(u64);
4473	/*
4474	 * We don't have the cpu and thread maps on the header, so
4475	 * for allocating the perf_sample_id table we fake 1 cpu and
4476	 * hattr->ids threads.
4477	 */
4478	if (perf_evsel__alloc_id(&evsel->core, 1, n_ids))
4479		return -ENOMEM;
4480
4481	ids = perf_record_header_attr_id(event);
4482	for (i = 0; i < n_ids; i++) {
4483		perf_evlist__id_add(&evlist->core, &evsel->core, 0, i, ids[i]);
4484	}
4485
4486	return 0;
4487}
4488
4489int perf_event__process_event_update(const struct perf_tool *tool __maybe_unused,
4490				     union perf_event *event,
4491				     struct evlist **pevlist)
4492{
4493	struct perf_record_event_update *ev = &event->event_update;
4494	struct evlist *evlist;
4495	struct evsel *evsel;
4496	struct perf_cpu_map *map;
4497
4498	if (dump_trace)
4499		perf_event__fprintf_event_update(event, stdout);
4500
4501	if (!pevlist || *pevlist == NULL)
4502		return -EINVAL;
4503
4504	evlist = *pevlist;
4505
4506	evsel = evlist__id2evsel(evlist, ev->id);
4507	if (evsel == NULL)
4508		return -EINVAL;
4509
4510	switch (ev->type) {
4511	case PERF_EVENT_UPDATE__UNIT:
4512		free((char *)evsel->unit);
4513		evsel->unit = strdup(ev->unit);
4514		break;
4515	case PERF_EVENT_UPDATE__NAME:
4516		free(evsel->name);
4517		evsel->name = strdup(ev->name);
4518		break;
4519	case PERF_EVENT_UPDATE__SCALE:
4520		evsel->scale = ev->scale.scale;
4521		break;
4522	case PERF_EVENT_UPDATE__CPUS:
4523		map = cpu_map__new_data(&ev->cpus.cpus);
4524		if (map) {
4525			perf_cpu_map__put(evsel->core.pmu_cpus);
4526			evsel->core.pmu_cpus = map;
4527		} else
4528			pr_err("failed to get event_update cpus\n");
4529	default:
4530		break;
4531	}
4532
4533	return 0;
4534}
4535
4536#ifdef HAVE_LIBTRACEEVENT
4537int perf_event__process_tracing_data(const struct perf_tool *tool __maybe_unused,
4538				     struct perf_session *session,
4539				     union perf_event *event)
4540{
4541	ssize_t size_read, padding, size = event->tracing_data.size;
4542	int fd = perf_data__fd(session->data);
4543	char buf[BUFSIZ];
4544
4545	/*
4546	 * The pipe fd is already in proper place and in any case
4547	 * we can't move it, and we'd screw the case where we read
4548	 * 'pipe' data from regular file. The trace_report reads
4549	 * data from 'fd' so we need to set it directly behind the
4550	 * event, where the tracing data starts.
4551	 */
4552	if (!perf_data__is_pipe(session->data)) {
4553		off_t offset = lseek(fd, 0, SEEK_CUR);
4554
4555		/* setup for reading amidst mmap */
4556		lseek(fd, offset + sizeof(struct perf_record_header_tracing_data),
4557		      SEEK_SET);
4558	}
4559
4560	size_read = trace_report(fd, &session->tevent, session->trace_event_repipe);
4561	padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
4562
4563	if (readn(fd, buf, padding) < 0) {
4564		pr_err("%s: reading input file", __func__);
4565		return -1;
4566	}
4567	if (session->trace_event_repipe) {
4568		int retw = write(STDOUT_FILENO, buf, padding);
4569		if (retw <= 0 || retw != padding) {
4570			pr_err("%s: repiping tracing data padding", __func__);
4571			return -1;
4572		}
4573	}
4574
4575	if (size_read + padding != size) {
4576		pr_err("%s: tracing data size mismatch", __func__);
4577		return -1;
4578	}
4579
4580	evlist__prepare_tracepoint_events(session->evlist, session->tevent.pevent);
4581
4582	return size_read + padding;
4583}
4584#endif
4585
4586int perf_event__process_build_id(const struct perf_tool *tool __maybe_unused,
4587				 struct perf_session *session,
4588				 union perf_event *event)
4589{
4590	__event_process_build_id(&event->build_id,
4591				 event->build_id.filename,
4592				 session);
4593	return 0;
4594}