brintos / linux-shallow public Read only

1// SPDX-License-Identifier: GPL-2.02#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_SUPPORT24#include <bpf/libbpf.h>25#endif26#include <perf/cpumap.h>27#include <tools/libc_compat.h> // reallocarray28 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 "asm/bug.h"48#include "tool.h"49#include "time-utils.h"50#include "units.h"51#include "util/util.h" // perf_exe()52#include "cputopo.h"53#include "bpf-event.h"54#include "bpf-utils.h"55#include "clockid.h"56 57#include <linux/ctype.h>58#include <internal/lib.h>59 60#ifdef HAVE_LIBTRACEEVENT61#include <traceevent/event-parse.h>62#endif63 64/*65 * magic2 = "PERFILE2"66 * must be a numerical value to let the endianness67 * determine the memory layout. That way we are able68 * to detect endianness when reading the perf.data file69 * back.70 *71 * we check for legacy (PERFFILE) format.72 */73static const char *__perf_magic1 = "PERFFILE";74static const u64 __perf_magic2    = 0x32454c4946524550ULL;75static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;76 77#define PERF_MAGIC	__perf_magic278 79const char perf_version_string[] = PERF_VERSION;80 81struct perf_file_attr {82	struct perf_event_attr	attr;83	struct perf_file_section	ids;84};85 86void perf_header__set_feat(struct perf_header *header, int feat)87{88	__set_bit(feat, header->adds_features);89}90 91void perf_header__clear_feat(struct perf_header *header, int feat)92{93	__clear_bit(feat, header->adds_features);94}95 96bool perf_header__has_feat(const struct perf_header *header, int feat)97{98	return test_bit(feat, header->adds_features);99}100 101static int __do_write_fd(struct feat_fd *ff, const void *buf, size_t size)102{103	ssize_t ret = writen(ff->fd, buf, size);104 105	if (ret != (ssize_t)size)106		return ret < 0 ? (int)ret : -1;107	return 0;108}109 110static int __do_write_buf(struct feat_fd *ff,  const void *buf, size_t size)111{112	/* struct perf_event_header::size is u16 */113	const size_t max_size = 0xffff - sizeof(struct perf_event_header);114	size_t new_size = ff->size;115	void *addr;116 117	if (size + ff->offset > max_size)118		return -E2BIG;119 120	while (size > (new_size - ff->offset))121		new_size <<= 1;122	new_size = min(max_size, new_size);123 124	if (ff->size < new_size) {125		addr = realloc(ff->buf, new_size);126		if (!addr)127			return -ENOMEM;128		ff->buf = addr;129		ff->size = new_size;130	}131 132	memcpy(ff->buf + ff->offset, buf, size);133	ff->offset += size;134 135	return 0;136}137 138/* Return: 0 if succeeded, -ERR if failed. */139int do_write(struct feat_fd *ff, const void *buf, size_t size)140{141	if (!ff->buf)142		return __do_write_fd(ff, buf, size);143	return __do_write_buf(ff, buf, size);144}145 146/* Return: 0 if succeeded, -ERR if failed. */147static int do_write_bitmap(struct feat_fd *ff, unsigned long *set, u64 size)148{149	u64 *p = (u64 *) set;150	int i, ret;151 152	ret = do_write(ff, &size, sizeof(size));153	if (ret < 0)154		return ret;155 156	for (i = 0; (u64) i < BITS_TO_U64(size); i++) {157		ret = do_write(ff, p + i, sizeof(*p));158		if (ret < 0)159			return ret;160	}161 162	return 0;163}164 165/* Return: 0 if succeeded, -ERR if failed. */166int write_padded(struct feat_fd *ff, const void *bf,167		 size_t count, size_t count_aligned)168{169	static const char zero_buf[NAME_ALIGN];170	int err = do_write(ff, bf, count);171 172	if (!err)173		err = do_write(ff, zero_buf, count_aligned - count);174 175	return err;176}177 178#define string_size(str)						\179	(PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))180 181/* Return: 0 if succeeded, -ERR if failed. */182static int do_write_string(struct feat_fd *ff, const char *str)183{184	u32 len, olen;185	int ret;186 187	olen = strlen(str) + 1;188	len = PERF_ALIGN(olen, NAME_ALIGN);189 190	/* write len, incl. \0 */191	ret = do_write(ff, &len, sizeof(len));192	if (ret < 0)193		return ret;194 195	return write_padded(ff, str, olen, len);196}197 198static int __do_read_fd(struct feat_fd *ff, void *addr, ssize_t size)199{200	ssize_t ret = readn(ff->fd, addr, size);201 202	if (ret != size)203		return ret < 0 ? (int)ret : -1;204	return 0;205}206 207static int __do_read_buf(struct feat_fd *ff, void *addr, ssize_t size)208{209	if (size > (ssize_t)ff->size - ff->offset)210		return -1;211 212	memcpy(addr, ff->buf + ff->offset, size);213	ff->offset += size;214 215	return 0;216 217}218 219static int __do_read(struct feat_fd *ff, void *addr, ssize_t size)220{221	if (!ff->buf)222		return __do_read_fd(ff, addr, size);223	return __do_read_buf(ff, addr, size);224}225 226static int do_read_u32(struct feat_fd *ff, u32 *addr)227{228	int ret;229 230	ret = __do_read(ff, addr, sizeof(*addr));231	if (ret)232		return ret;233 234	if (ff->ph->needs_swap)235		*addr = bswap_32(*addr);236	return 0;237}238 239static int do_read_u64(struct feat_fd *ff, u64 *addr)240{241	int ret;242 243	ret = __do_read(ff, addr, sizeof(*addr));244	if (ret)245		return ret;246 247	if (ff->ph->needs_swap)248		*addr = bswap_64(*addr);249	return 0;250}251 252static char *do_read_string(struct feat_fd *ff)253{254	u32 len;255	char *buf;256 257	if (do_read_u32(ff, &len))258		return NULL;259 260	buf = malloc(len);261	if (!buf)262		return NULL;263 264	if (!__do_read(ff, buf, len)) {265		/*266		 * strings are padded by zeroes267		 * thus the actual strlen of buf268		 * may be less than len269		 */270		return buf;271	}272 273	free(buf);274	return NULL;275}276 277/* Return: 0 if succeeded, -ERR if failed. */278static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)279{280	unsigned long *set;281	u64 size, *p;282	int i, ret;283 284	ret = do_read_u64(ff, &size);285	if (ret)286		return ret;287 288	set = bitmap_zalloc(size);289	if (!set)290		return -ENOMEM;291 292	p = (u64 *) set;293 294	for (i = 0; (u64) i < BITS_TO_U64(size); i++) {295		ret = do_read_u64(ff, p + i);296		if (ret < 0) {297			free(set);298			return ret;299		}300	}301 302	*pset  = set;303	*psize = size;304	return 0;305}306 307#ifdef HAVE_LIBTRACEEVENT308static int write_tracing_data(struct feat_fd *ff,309			      struct evlist *evlist)310{311	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))312		return -1;313 314	return read_tracing_data(ff->fd, &evlist->core.entries);315}316#endif317 318static int write_build_id(struct feat_fd *ff,319			  struct evlist *evlist __maybe_unused)320{321	struct perf_session *session;322	int err;323 324	session = container_of(ff->ph, struct perf_session, header);325 326	if (!perf_session__read_build_ids(session, true))327		return -1;328 329	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))330		return -1;331 332	err = perf_session__write_buildid_table(session, ff);333	if (err < 0) {334		pr_debug("failed to write buildid table\n");335		return err;336	}337	perf_session__cache_build_ids(session);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#else462#define CPUINFO_PROC	{ "model name", }463#endif464	const char *cpuinfo_procs[] = CPUINFO_PROC;465#undef CPUINFO_PROC466	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 events511	 */512	ret = do_write(ff, &nre, sizeof(nre));513	if (ret < 0)514		return ret;515 516	/*517	 * size of perf_event_attr struct518	 */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 event530		 * there is one id per instance of an event531		 *532		 * copy into an nri to be independent of the533		 * 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 cmdline542		 */543		ret = do_write_string(ff, evsel__name(evsel));544		if (ret < 0)545			return ret;546		/*547		 * write unique ids for this event548		 */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	char pbuf[MAXPATHLEN], *buf;560	int i, ret, n;561 562	/* actual path to perf binary */563	buf = perf_exe(pbuf, MAXPATHLEN);564 565	/* account for binary path */566	n = perf_env.nr_cmdline + 1;567 568	ret = do_write(ff, &n, sizeof(n));569	if (ret < 0)570		return ret;571 572	ret = do_write_string(ff, buf);573	if (ret < 0)574		return ret;575 576	for (i = 0 ; i < perf_env.nr_cmdline; i++) {577		ret = do_write_string(ff, perf_env.cmdline_argv[i]);578		if (ret < 0)579			return ret;580	}581	return 0;582}583 584 585static int write_cpu_topology(struct feat_fd *ff,586			      struct evlist *evlist __maybe_unused)587{588	struct cpu_topology *tp;589	u32 i;590	int ret, j;591 592	tp = cpu_topology__new();593	if (!tp)594		return -1;595 596	ret = do_write(ff, &tp->package_cpus_lists, sizeof(tp->package_cpus_lists));597	if (ret < 0)598		goto done;599 600	for (i = 0; i < tp->package_cpus_lists; i++) {601		ret = do_write_string(ff, tp->package_cpus_list[i]);602		if (ret < 0)603			goto done;604	}605	ret = do_write(ff, &tp->core_cpus_lists, sizeof(tp->core_cpus_lists));606	if (ret < 0)607		goto done;608 609	for (i = 0; i < tp->core_cpus_lists; i++) {610		ret = do_write_string(ff, tp->core_cpus_list[i]);611		if (ret < 0)612			break;613	}614 615	ret = perf_env__read_cpu_topology_map(&perf_env);616	if (ret < 0)617		goto done;618 619	for (j = 0; j < perf_env.nr_cpus_avail; j++) {620		ret = do_write(ff, &perf_env.cpu[j].core_id,621			       sizeof(perf_env.cpu[j].core_id));622		if (ret < 0)623			return ret;624		ret = do_write(ff, &perf_env.cpu[j].socket_id,625			       sizeof(perf_env.cpu[j].socket_id));626		if (ret < 0)627			return ret;628	}629 630	if (!tp->die_cpus_lists)631		goto done;632 633	ret = do_write(ff, &tp->die_cpus_lists, sizeof(tp->die_cpus_lists));634	if (ret < 0)635		goto done;636 637	for (i = 0; i < tp->die_cpus_lists; i++) {638		ret = do_write_string(ff, tp->die_cpus_list[i]);639		if (ret < 0)640			goto done;641	}642 643	for (j = 0; j < perf_env.nr_cpus_avail; j++) {644		ret = do_write(ff, &perf_env.cpu[j].die_id,645			       sizeof(perf_env.cpu[j].die_id));646		if (ret < 0)647			return ret;648	}649 650done:651	cpu_topology__delete(tp);652	return ret;653}654 655 656 657static int write_total_mem(struct feat_fd *ff,658			   struct evlist *evlist __maybe_unused)659{660	char *buf = NULL;661	FILE *fp;662	size_t len = 0;663	int ret = -1, n;664	uint64_t mem;665 666	fp = fopen("/proc/meminfo", "r");667	if (!fp)668		return -1;669 670	while (getline(&buf, &len, fp) > 0) {671		ret = strncmp(buf, "MemTotal:", 9);672		if (!ret)673			break;674	}675	if (!ret) {676		n = sscanf(buf, "%*s %"PRIu64, &mem);677		if (n == 1)678			ret = do_write(ff, &mem, sizeof(mem));679	} else680		ret = -1;681	free(buf);682	fclose(fp);683	return ret;684}685 686static int write_numa_topology(struct feat_fd *ff,687			       struct evlist *evlist __maybe_unused)688{689	struct numa_topology *tp;690	int ret = -1;691	u32 i;692 693	tp = numa_topology__new();694	if (!tp)695		return -ENOMEM;696 697	ret = do_write(ff, &tp->nr, sizeof(u32));698	if (ret < 0)699		goto err;700 701	for (i = 0; i < tp->nr; i++) {702		struct numa_topology_node *n = &tp->nodes[i];703 704		ret = do_write(ff, &n->node, sizeof(u32));705		if (ret < 0)706			goto err;707 708		ret = do_write(ff, &n->mem_total, sizeof(u64));709		if (ret)710			goto err;711 712		ret = do_write(ff, &n->mem_free, sizeof(u64));713		if (ret)714			goto err;715 716		ret = do_write_string(ff, n->cpus);717		if (ret < 0)718			goto err;719	}720 721	ret = 0;722 723err:724	numa_topology__delete(tp);725	return ret;726}727 728/*729 * File format:730 *731 * struct pmu_mappings {732 *	u32	pmu_num;733 *	struct pmu_map {734 *		u32	type;735 *		char	name[];736 *	}[pmu_num];737 * };738 */739 740static int write_pmu_mappings(struct feat_fd *ff,741			      struct evlist *evlist __maybe_unused)742{743	struct perf_pmu *pmu = NULL;744	u32 pmu_num = 0;745	int ret;746 747	/*748	 * Do a first pass to count number of pmu to avoid lseek so this749	 * works in pipe mode as well.750	 */751	while ((pmu = perf_pmus__scan(pmu)))752		pmu_num++;753 754	ret = do_write(ff, &pmu_num, sizeof(pmu_num));755	if (ret < 0)756		return ret;757 758	while ((pmu = perf_pmus__scan(pmu))) {759		ret = do_write(ff, &pmu->type, sizeof(pmu->type));760		if (ret < 0)761			return ret;762 763		ret = do_write_string(ff, pmu->name);764		if (ret < 0)765			return ret;766	}767 768	return 0;769}770 771/*772 * File format:773 *774 * struct group_descs {775 *	u32	nr_groups;776 *	struct group_desc {777 *		char	name[];778 *		u32	leader_idx;779 *		u32	nr_members;780 *	}[nr_groups];781 * };782 */783static int write_group_desc(struct feat_fd *ff,784			    struct evlist *evlist)785{786	u32 nr_groups = evlist__nr_groups(evlist);787	struct evsel *evsel;788	int ret;789 790	ret = do_write(ff, &nr_groups, sizeof(nr_groups));791	if (ret < 0)792		return ret;793 794	evlist__for_each_entry(evlist, evsel) {795		if (evsel__is_group_leader(evsel) && evsel->core.nr_members > 1) {796			const char *name = evsel->group_name ?: "{anon_group}";797			u32 leader_idx = evsel->core.idx;798			u32 nr_members = evsel->core.nr_members;799 800			ret = do_write_string(ff, name);801			if (ret < 0)802				return ret;803 804			ret = do_write(ff, &leader_idx, sizeof(leader_idx));805			if (ret < 0)806				return ret;807 808			ret = do_write(ff, &nr_members, sizeof(nr_members));809			if (ret < 0)810				return ret;811		}812	}813	return 0;814}815 816/*817 * Return the CPU id as a raw string.818 *819 * Each architecture should provide a more precise id string that820 * can be use to match the architecture's "mapfile".821 */822char * __weak get_cpuid_str(struct perf_pmu *pmu __maybe_unused)823{824	return NULL;825}826 827/* Return zero when the cpuid from the mapfile.csv matches the828 * cpuid string generated on this platform.829 * Otherwise return non-zero.830 */831int __weak strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)832{833	regex_t re;834	regmatch_t pmatch[1];835	int match;836 837	if (regcomp(&re, mapcpuid, REG_EXTENDED) != 0) {838		/* Warn unable to generate match particular string. */839		pr_info("Invalid regular expression %s\n", mapcpuid);840		return 1;841	}842 843	match = !regexec(&re, cpuid, 1, pmatch, 0);844	regfree(&re);845	if (match) {846		size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);847 848		/* Verify the entire string matched. */849		if (match_len == strlen(cpuid))850			return 0;851	}852	return 1;853}854 855/*856 * default get_cpuid(): nothing gets recorded857 * actual implementation must be in arch/$(SRCARCH)/util/header.c858 */859int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)860{861	return ENOSYS; /* Not implemented */862}863 864static int write_cpuid(struct feat_fd *ff,865		       struct evlist *evlist __maybe_unused)866{867	char buffer[64];868	int ret;869 870	ret = get_cpuid(buffer, sizeof(buffer));871	if (ret)872		return -1;873 874	return do_write_string(ff, buffer);875}876 877static int write_branch_stack(struct feat_fd *ff __maybe_unused,878			      struct evlist *evlist __maybe_unused)879{880	return 0;881}882 883static int write_auxtrace(struct feat_fd *ff,884			  struct evlist *evlist __maybe_unused)885{886	struct perf_session *session;887	int err;888 889	if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))890		return -1;891 892	session = container_of(ff->ph, struct perf_session, header);893 894	err = auxtrace_index__write(ff->fd, &session->auxtrace_index);895	if (err < 0)896		pr_err("Failed to write auxtrace index\n");897	return err;898}899 900static int write_clockid(struct feat_fd *ff,901			 struct evlist *evlist __maybe_unused)902{903	return do_write(ff, &ff->ph->env.clock.clockid_res_ns,904			sizeof(ff->ph->env.clock.clockid_res_ns));905}906 907static int write_clock_data(struct feat_fd *ff,908			    struct evlist *evlist __maybe_unused)909{910	u64 *data64;911	u32 data32;912	int ret;913 914	/* version */915	data32 = 1;916 917	ret = do_write(ff, &data32, sizeof(data32));918	if (ret < 0)919		return ret;920 921	/* clockid */922	data32 = ff->ph->env.clock.clockid;923 924	ret = do_write(ff, &data32, sizeof(data32));925	if (ret < 0)926		return ret;927 928	/* TOD ref time */929	data64 = &ff->ph->env.clock.tod_ns;930 931	ret = do_write(ff, data64, sizeof(*data64));932	if (ret < 0)933		return ret;934 935	/* clockid ref time */936	data64 = &ff->ph->env.clock.clockid_ns;937 938	return do_write(ff, data64, sizeof(*data64));939}940 941static int write_hybrid_topology(struct feat_fd *ff,942				 struct evlist *evlist __maybe_unused)943{944	struct hybrid_topology *tp;945	int ret;946	u32 i;947 948	tp = hybrid_topology__new();949	if (!tp)950		return -ENOENT;951 952	ret = do_write(ff, &tp->nr, sizeof(u32));953	if (ret < 0)954		goto err;955 956	for (i = 0; i < tp->nr; i++) {957		struct hybrid_topology_node *n = &tp->nodes[i];958 959		ret = do_write_string(ff, n->pmu_name);960		if (ret < 0)961			goto err;962 963		ret = do_write_string(ff, n->cpus);964		if (ret < 0)965			goto err;966	}967 968	ret = 0;969 970err:971	hybrid_topology__delete(tp);972	return ret;973}974 975static int write_dir_format(struct feat_fd *ff,976			    struct evlist *evlist __maybe_unused)977{978	struct perf_session *session;979	struct perf_data *data;980 981	session = container_of(ff->ph, struct perf_session, header);982	data = session->data;983 984	if (WARN_ON(!perf_data__is_dir(data)))985		return -1;986 987	return do_write(ff, &data->dir.version, sizeof(data->dir.version));988}989 990/*991 * Check whether a CPU is online992 *993 * Returns:994 *     1 -> if CPU is online995 *     0 -> if CPU is offline996 *    -1 -> error case997 */998int is_cpu_online(unsigned int cpu)999{1000	char *str;1001	size_t strlen;1002	char buf[256];1003	int status = -1;1004	struct stat statbuf;1005 1006	snprintf(buf, sizeof(buf),1007		"/sys/devices/system/cpu/cpu%d", cpu);1008	if (stat(buf, &statbuf) != 0)1009		return 0;1010 1011	/*1012	 * Check if /sys/devices/system/cpu/cpux/online file1013	 * exists. Some cases cpu0 won't have online file since1014	 * it is not expected to be turned off generally.1015	 * In kernels without CONFIG_HOTPLUG_CPU, this1016	 * file won't exist1017	 */1018	snprintf(buf, sizeof(buf),1019		"/sys/devices/system/cpu/cpu%d/online", cpu);1020	if (stat(buf, &statbuf) != 0)1021		return 1;1022 1023	/*1024	 * Read online file using sysfs__read_str.1025	 * If read or open fails, return -1.1026	 * If read succeeds, return value from file1027	 * which gets stored in "str"1028	 */1029	snprintf(buf, sizeof(buf),1030		"devices/system/cpu/cpu%d/online", cpu);1031 1032	if (sysfs__read_str(buf, &str, &strlen) < 0)1033		return status;1034 1035	status = atoi(str);1036 1037	free(str);1038	return status;1039}1040 1041#ifdef HAVE_LIBBPF_SUPPORT1042static int write_bpf_prog_info(struct feat_fd *ff,1043			       struct evlist *evlist __maybe_unused)1044{1045	struct perf_env *env = &ff->ph->env;1046	struct rb_root *root;1047	struct rb_node *next;1048	int ret;1049 1050	down_read(&env->bpf_progs.lock);1051 1052	ret = do_write(ff, &env->bpf_progs.infos_cnt,1053		       sizeof(env->bpf_progs.infos_cnt));1054	if (ret < 0)1055		goto out;1056 1057	root = &env->bpf_progs.infos;1058	next = rb_first(root);1059	while (next) {1060		struct bpf_prog_info_node *node;1061		size_t len;1062 1063		node = rb_entry(next, struct bpf_prog_info_node, rb_node);1064		next = rb_next(&node->rb_node);1065		len = sizeof(struct perf_bpil) +1066			node->info_linear->data_len;1067 1068		/* before writing to file, translate address to offset */1069		bpil_addr_to_offs(node->info_linear);1070		ret = do_write(ff, node->info_linear, len);1071		/*1072		 * translate back to address even when do_write() fails,1073		 * so that this function never changes the data.1074		 */1075		bpil_offs_to_addr(node->info_linear);1076		if (ret < 0)1077			goto out;1078	}1079out:1080	up_read(&env->bpf_progs.lock);1081	return ret;1082}1083 1084static int write_bpf_btf(struct feat_fd *ff,1085			 struct evlist *evlist __maybe_unused)1086{1087	struct perf_env *env = &ff->ph->env;1088	struct rb_root *root;1089	struct rb_node *next;1090	int ret;1091 1092	down_read(&env->bpf_progs.lock);1093 1094	ret = do_write(ff, &env->bpf_progs.btfs_cnt,1095		       sizeof(env->bpf_progs.btfs_cnt));1096 1097	if (ret < 0)1098		goto out;1099 1100	root = &env->bpf_progs.btfs;1101	next = rb_first(root);1102	while (next) {1103		struct btf_node *node;1104 1105		node = rb_entry(next, struct btf_node, rb_node);1106		next = rb_next(&node->rb_node);1107		ret = do_write(ff, &node->id,1108			       sizeof(u32) * 2 + node->data_size);1109		if (ret < 0)1110			goto out;1111	}1112out:1113	up_read(&env->bpf_progs.lock);1114	return ret;1115}1116#endif // HAVE_LIBBPF_SUPPORT1117 1118static int cpu_cache_level__sort(const void *a, const void *b)1119{1120	struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;1121	struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;1122 1123	return cache_a->level - cache_b->level;1124}1125 1126static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)1127{1128	if (a->level != b->level)1129		return false;1130 1131	if (a->line_size != b->line_size)1132		return false;1133 1134	if (a->sets != b->sets)1135		return false;1136 1137	if (a->ways != b->ways)1138		return false;1139 1140	if (strcmp(a->type, b->type))1141		return false;1142 1143	if (strcmp(a->size, b->size))1144		return false;1145 1146	if (strcmp(a->map, b->map))1147		return false;1148 1149	return true;1150}1151 1152static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)1153{1154	char path[PATH_MAX], file[PATH_MAX];1155	struct stat st;1156	size_t len;1157 1158	scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);1159	scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);1160 1161	if (stat(file, &st))1162		return 1;1163 1164	scnprintf(file, PATH_MAX, "%s/level", path);1165	if (sysfs__read_int(file, (int *) &cache->level))1166		return -1;1167 1168	scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);1169	if (sysfs__read_int(file, (int *) &cache->line_size))1170		return -1;1171 1172	scnprintf(file, PATH_MAX, "%s/number_of_sets", path);1173	if (sysfs__read_int(file, (int *) &cache->sets))1174		return -1;1175 1176	scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);1177	if (sysfs__read_int(file, (int *) &cache->ways))1178		return -1;1179 1180	scnprintf(file, PATH_MAX, "%s/type", path);1181	if (sysfs__read_str(file, &cache->type, &len))1182		return -1;1183 1184	cache->type[len] = 0;1185	cache->type = strim(cache->type);1186 1187	scnprintf(file, PATH_MAX, "%s/size", path);1188	if (sysfs__read_str(file, &cache->size, &len)) {1189		zfree(&cache->type);1190		return -1;1191	}1192 1193	cache->size[len] = 0;1194	cache->size = strim(cache->size);1195 1196	scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);1197	if (sysfs__read_str(file, &cache->map, &len)) {1198		zfree(&cache->size);1199		zfree(&cache->type);1200		return -1;1201	}1202 1203	cache->map[len] = 0;1204	cache->map = strim(cache->map);1205	return 0;1206}1207 1208static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)1209{1210	fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);1211}1212 1213/*1214 * Build caches levels for a particular CPU from the data in1215 * /sys/devices/system/cpu/cpu<cpu>/cache/1216 * The cache level data is stored in caches[] from index at1217 * *cntp.1218 */1219int build_caches_for_cpu(u32 cpu, struct cpu_cache_level caches[], u32 *cntp)1220{1221	u16 level;1222 1223	for (level = 0; level < MAX_CACHE_LVL; level++) {1224		struct cpu_cache_level c;1225		int err;1226		u32 i;1227 1228		err = cpu_cache_level__read(&c, cpu, level);1229		if (err < 0)1230			return err;1231 1232		if (err == 1)1233			break;1234 1235		for (i = 0; i < *cntp; i++) {1236			if (cpu_cache_level__cmp(&c, &caches[i]))1237				break;1238		}1239 1240		if (i == *cntp) {1241			caches[*cntp] = c;1242			*cntp = *cntp + 1;1243		} else1244			cpu_cache_level__free(&c);1245	}1246 1247	return 0;1248}1249 1250static int build_caches(struct cpu_cache_level caches[], u32 *cntp)1251{1252	u32 nr, cpu, cnt = 0;1253 1254	nr = cpu__max_cpu().cpu;1255 1256	for (cpu = 0; cpu < nr; cpu++) {1257		int ret = build_caches_for_cpu(cpu, caches, &cnt);1258 1259		if (ret)1260			return ret;1261	}1262	*cntp = cnt;1263	return 0;1264}1265 1266static int write_cache(struct feat_fd *ff,1267		       struct evlist *evlist __maybe_unused)1268{1269	u32 max_caches = cpu__max_cpu().cpu * MAX_CACHE_LVL;1270	struct cpu_cache_level caches[max_caches];1271	u32 cnt = 0, i, version = 1;1272	int ret;1273 1274	ret = build_caches(caches, &cnt);1275	if (ret)1276		goto out;1277 1278	qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);1279 1280	ret = do_write(ff, &version, sizeof(u32));1281	if (ret < 0)1282		goto out;1283 1284	ret = do_write(ff, &cnt, sizeof(u32));1285	if (ret < 0)1286		goto out;1287 1288	for (i = 0; i < cnt; i++) {1289		struct cpu_cache_level *c = &caches[i];1290 1291		#define _W(v)					\1292			ret = do_write(ff, &c->v, sizeof(u32));	\1293			if (ret < 0)				\1294				goto out;1295 1296		_W(level)1297		_W(line_size)1298		_W(sets)1299		_W(ways)1300		#undef _W1301 1302		#define _W(v)						\1303			ret = do_write_string(ff, (const char *) c->v);	\1304			if (ret < 0)					\1305				goto out;1306 1307		_W(type)1308		_W(size)1309		_W(map)1310		#undef _W1311	}1312 1313out:1314	for (i = 0; i < cnt; i++)1315		cpu_cache_level__free(&caches[i]);1316	return ret;1317}1318 1319static int write_stat(struct feat_fd *ff __maybe_unused,1320		      struct evlist *evlist __maybe_unused)1321{1322	return 0;1323}1324 1325static int write_sample_time(struct feat_fd *ff,1326			     struct evlist *evlist)1327{1328	int ret;1329 1330	ret = do_write(ff, &evlist->first_sample_time,1331		       sizeof(evlist->first_sample_time));1332	if (ret < 0)1333		return ret;1334 1335	return do_write(ff, &evlist->last_sample_time,1336			sizeof(evlist->last_sample_time));1337}1338 1339 1340static int memory_node__read(struct memory_node *n, unsigned long idx)1341{1342	unsigned int phys, size = 0;1343	char path[PATH_MAX];1344	struct dirent *ent;1345	DIR *dir;1346 1347#define for_each_memory(mem, dir)					\1348	while ((ent = readdir(dir)))					\1349		if (strcmp(ent->d_name, ".") &&				\1350		    strcmp(ent->d_name, "..") &&			\1351		    sscanf(ent->d_name, "memory%u", &mem) == 1)1352 1353	scnprintf(path, PATH_MAX,1354		  "%s/devices/system/node/node%lu",1355		  sysfs__mountpoint(), idx);1356 1357	dir = opendir(path);1358	if (!dir) {1359		pr_warning("failed: can't open memory sysfs data\n");1360		return -1;1361	}1362 1363	for_each_memory(phys, dir) {1364		size = max(phys, size);1365	}1366 1367	size++;1368 1369	n->set = bitmap_zalloc(size);1370	if (!n->set) {1371		closedir(dir);1372		return -ENOMEM;1373	}1374 1375	n->node = idx;1376	n->size = size;1377 1378	rewinddir(dir);1379 1380	for_each_memory(phys, dir) {1381		__set_bit(phys, n->set);1382	}1383 1384	closedir(dir);1385	return 0;1386}1387 1388static void memory_node__delete_nodes(struct memory_node *nodesp, u64 cnt)1389{1390	for (u64 i = 0; i < cnt; i++)1391		bitmap_free(nodesp[i].set);1392 1393	free(nodesp);1394}1395 1396static int memory_node__sort(const void *a, const void *b)1397{1398	const struct memory_node *na = a;1399	const struct memory_node *nb = b;1400 1401	return na->node - nb->node;1402}1403 1404static int build_mem_topology(struct memory_node **nodesp, u64 *cntp)1405{1406	char path[PATH_MAX];1407	struct dirent *ent;1408	DIR *dir;1409	int ret = 0;1410	size_t cnt = 0, size = 0;1411	struct memory_node *nodes = NULL;1412 1413	scnprintf(path, PATH_MAX, "%s/devices/system/node/",1414		  sysfs__mountpoint());1415 1416	dir = opendir(path);1417	if (!dir) {1418		pr_debug2("%s: couldn't read %s, does this arch have topology information?\n",1419			  __func__, path);1420		return -1;1421	}1422 1423	while (!ret && (ent = readdir(dir))) {1424		unsigned int idx;1425		int r;1426 1427		if (!strcmp(ent->d_name, ".") ||1428		    !strcmp(ent->d_name, ".."))1429			continue;1430 1431		r = sscanf(ent->d_name, "node%u", &idx);1432		if (r != 1)1433			continue;1434 1435		if (cnt >= size) {1436			struct memory_node *new_nodes =1437				reallocarray(nodes, cnt + 4, sizeof(*nodes));1438 1439			if (!new_nodes) {1440				pr_err("Failed to write MEM_TOPOLOGY, size %zd nodes\n", size);1441				ret = -ENOMEM;1442				goto out;1443			}1444			nodes = new_nodes;1445			size += 4;1446		}1447		ret = memory_node__read(&nodes[cnt], idx);1448		if (!ret)1449			cnt += 1;1450	}1451out:1452	closedir(dir);1453	if (!ret) {1454		*cntp = cnt;1455		*nodesp = nodes;1456		qsort(nodes, cnt, sizeof(nodes[0]), memory_node__sort);1457	} else1458		memory_node__delete_nodes(nodes, cnt);1459 1460	return ret;1461}1462 1463/*1464 * The MEM_TOPOLOGY holds physical memory map for every1465 * node in system. The format of data is as follows:1466 *1467 *  0 - version          | for future changes1468 *  8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes1469 * 16 - count            | number of nodes1470 *1471 * For each node we store map of physical indexes for1472 * each node:1473 *1474 * 32 - node id          | node index1475 * 40 - size             | size of bitmap1476 * 48 - bitmap           | bitmap of memory indexes that belongs to node1477 */1478static int write_mem_topology(struct feat_fd *ff __maybe_unused,1479			      struct evlist *evlist __maybe_unused)1480{1481	struct memory_node *nodes = NULL;1482	u64 bsize, version = 1, i, nr = 0;1483	int ret;1484 1485	ret = sysfs__read_xll("devices/system/memory/block_size_bytes",1486			      (unsigned long long *) &bsize);1487	if (ret)1488		return ret;1489 1490	ret = build_mem_topology(&nodes, &nr);1491	if (ret)1492		return ret;1493 1494	ret = do_write(ff, &version, sizeof(version));1495	if (ret < 0)1496		goto out;1497 1498	ret = do_write(ff, &bsize, sizeof(bsize));1499	if (ret < 0)1500		goto out;1501 1502	ret = do_write(ff, &nr, sizeof(nr));1503	if (ret < 0)1504		goto out;1505 1506	for (i = 0; i < nr; i++) {1507		struct memory_node *n = &nodes[i];1508 1509		#define _W(v)						\1510			ret = do_write(ff, &n->v, sizeof(n->v));	\1511			if (ret < 0)					\1512				goto out;1513 1514		_W(node)1515		_W(size)1516 1517		#undef _W1518 1519		ret = do_write_bitmap(ff, n->set, n->size);1520		if (ret < 0)1521			goto out;1522	}1523 1524out:1525	memory_node__delete_nodes(nodes, nr);1526	return ret;1527}1528 1529static int write_compressed(struct feat_fd *ff __maybe_unused,1530			    struct evlist *evlist __maybe_unused)1531{1532	int ret;1533 1534	ret = do_write(ff, &(ff->ph->env.comp_ver), sizeof(ff->ph->env.comp_ver));1535	if (ret)1536		return ret;1537 1538	ret = do_write(ff, &(ff->ph->env.comp_type), sizeof(ff->ph->env.comp_type));1539	if (ret)1540		return ret;1541 1542	ret = do_write(ff, &(ff->ph->env.comp_level), sizeof(ff->ph->env.comp_level));1543	if (ret)1544		return ret;1545 1546	ret = do_write(ff, &(ff->ph->env.comp_ratio), sizeof(ff->ph->env.comp_ratio));1547	if (ret)1548		return ret;1549 1550	return do_write(ff, &(ff->ph->env.comp_mmap_len), sizeof(ff->ph->env.comp_mmap_len));1551}1552 1553static int __write_pmu_caps(struct feat_fd *ff, struct perf_pmu *pmu,1554			    bool write_pmu)1555{1556	struct perf_pmu_caps *caps = NULL;1557	int ret;1558 1559	ret = do_write(ff, &pmu->nr_caps, sizeof(pmu->nr_caps));1560	if (ret < 0)1561		return ret;1562 1563	list_for_each_entry(caps, &pmu->caps, list) {1564		ret = do_write_string(ff, caps->name);1565		if (ret < 0)1566			return ret;1567 1568		ret = do_write_string(ff, caps->value);1569		if (ret < 0)1570			return ret;1571	}1572 1573	if (write_pmu) {1574		ret = do_write_string(ff, pmu->name);1575		if (ret < 0)1576			return ret;1577	}1578 1579	return ret;1580}1581 1582static int write_cpu_pmu_caps(struct feat_fd *ff,1583			      struct evlist *evlist __maybe_unused)1584{1585	struct perf_pmu *cpu_pmu = perf_pmus__find("cpu");1586	int ret;1587 1588	if (!cpu_pmu)1589		return -ENOENT;1590 1591	ret = perf_pmu__caps_parse(cpu_pmu);1592	if (ret < 0)1593		return ret;1594 1595	return __write_pmu_caps(ff, cpu_pmu, false);1596}1597 1598static int write_pmu_caps(struct feat_fd *ff,1599			  struct evlist *evlist __maybe_unused)1600{1601	struct perf_pmu *pmu = NULL;1602	int nr_pmu = 0;1603	int ret;1604 1605	while ((pmu = perf_pmus__scan(pmu))) {1606		if (!strcmp(pmu->name, "cpu")) {1607			/*1608			 * The "cpu" PMU is special and covered by1609			 * HEADER_CPU_PMU_CAPS. Note, core PMUs are1610			 * counted/written here for ARM, s390 and Intel hybrid.1611			 */1612			continue;1613		}1614		if (perf_pmu__caps_parse(pmu) <= 0)1615			continue;1616		nr_pmu++;1617	}1618 1619	ret = do_write(ff, &nr_pmu, sizeof(nr_pmu));1620	if (ret < 0)1621		return ret;1622 1623	if (!nr_pmu)1624		return 0;1625 1626	/*1627	 * Note older perf tools assume core PMUs come first, this is a property1628	 * of perf_pmus__scan.1629	 */1630	pmu = NULL;1631	while ((pmu = perf_pmus__scan(pmu))) {1632		if (!strcmp(pmu->name, "cpu")) {1633			/* Skip as above. */1634			continue;1635		}1636		if (perf_pmu__caps_parse(pmu) <= 0)1637			continue;1638		ret = __write_pmu_caps(ff, pmu, true);1639		if (ret < 0)1640			return ret;1641	}1642	return 0;1643}1644 1645static void print_hostname(struct feat_fd *ff, FILE *fp)1646{1647	fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);1648}1649 1650static void print_osrelease(struct feat_fd *ff, FILE *fp)1651{1652	fprintf(fp, "# os release : %s\n", ff->ph->env.os_release);1653}1654 1655static void print_arch(struct feat_fd *ff, FILE *fp)1656{1657	fprintf(fp, "# arch : %s\n", ff->ph->env.arch);1658}1659 1660static void print_cpudesc(struct feat_fd *ff, FILE *fp)1661{1662	fprintf(fp, "# cpudesc : %s\n", ff->ph->env.cpu_desc);1663}1664 1665static void print_nrcpus(struct feat_fd *ff, FILE *fp)1666{1667	fprintf(fp, "# nrcpus online : %u\n", ff->ph->env.nr_cpus_online);1668	fprintf(fp, "# nrcpus avail : %u\n", ff->ph->env.nr_cpus_avail);1669}1670 1671static void print_version(struct feat_fd *ff, FILE *fp)1672{1673	fprintf(fp, "# perf version : %s\n", ff->ph->env.version);1674}1675 1676static void print_cmdline(struct feat_fd *ff, FILE *fp)1677{1678	int nr, i;1679 1680	nr = ff->ph->env.nr_cmdline;1681 1682	fprintf(fp, "# cmdline : ");1683 1684	for (i = 0; i < nr; i++) {1685		char *argv_i = strdup(ff->ph->env.cmdline_argv[i]);1686		if (!argv_i) {1687			fprintf(fp, "%s ", ff->ph->env.cmdline_argv[i]);1688		} else {1689			char *mem = argv_i;1690			do {1691				char *quote = strchr(argv_i, '\'');1692				if (!quote)1693					break;1694				*quote++ = '\0';1695				fprintf(fp, "%s\\\'", argv_i);1696				argv_i = quote;1697			} while (1);1698			fprintf(fp, "%s ", argv_i);1699			free(mem);1700		}1701	}1702	fputc('\n', fp);1703}1704 1705static void print_cpu_topology(struct feat_fd *ff, FILE *fp)1706{1707	struct perf_header *ph = ff->ph;1708	int cpu_nr = ph->env.nr_cpus_avail;1709	int nr, i;1710	char *str;1711 1712	nr = ph->env.nr_sibling_cores;1713	str = ph->env.sibling_cores;1714 1715	for (i = 0; i < nr; i++) {1716		fprintf(fp, "# sibling sockets : %s\n", str);1717		str += strlen(str) + 1;1718	}1719 1720	if (ph->env.nr_sibling_dies) {1721		nr = ph->env.nr_sibling_dies;1722		str = ph->env.sibling_dies;1723 1724		for (i = 0; i < nr; i++) {1725			fprintf(fp, "# sibling dies    : %s\n", str);1726			str += strlen(str) + 1;1727		}1728	}1729 1730	nr = ph->env.nr_sibling_threads;1731	str = ph->env.sibling_threads;1732 1733	for (i = 0; i < nr; i++) {1734		fprintf(fp, "# sibling threads : %s\n", str);1735		str += strlen(str) + 1;1736	}1737 1738	if (ph->env.nr_sibling_dies) {1739		if (ph->env.cpu != NULL) {1740			for (i = 0; i < cpu_nr; i++)1741				fprintf(fp, "# CPU %d: Core ID %d, "1742					    "Die ID %d, Socket ID %d\n",1743					    i, ph->env.cpu[i].core_id,1744					    ph->env.cpu[i].die_id,1745					    ph->env.cpu[i].socket_id);1746		} else1747			fprintf(fp, "# Core ID, Die ID and Socket ID "1748				    "information is not available\n");1749	} else {1750		if (ph->env.cpu != NULL) {1751			for (i = 0; i < cpu_nr; i++)1752				fprintf(fp, "# CPU %d: Core ID %d, "1753					    "Socket ID %d\n",1754					    i, ph->env.cpu[i].core_id,1755					    ph->env.cpu[i].socket_id);1756		} else1757			fprintf(fp, "# Core ID and Socket ID "1758				    "information is not available\n");1759	}1760}1761 1762static void print_clockid(struct feat_fd *ff, FILE *fp)1763{1764	fprintf(fp, "# clockid frequency: %"PRIu64" MHz\n",1765		ff->ph->env.clock.clockid_res_ns * 1000);1766}1767 1768static void print_clock_data(struct feat_fd *ff, FILE *fp)1769{1770	struct timespec clockid_ns;1771	char tstr[64], date[64];1772	struct timeval tod_ns;1773	clockid_t clockid;1774	struct tm ltime;1775	u64 ref;1776 1777	if (!ff->ph->env.clock.enabled) {1778		fprintf(fp, "# reference time disabled\n");1779		return;1780	}1781 1782	/* Compute TOD time. */1783	ref = ff->ph->env.clock.tod_ns;1784	tod_ns.tv_sec = ref / NSEC_PER_SEC;1785	ref -= tod_ns.tv_sec * NSEC_PER_SEC;1786	tod_ns.tv_usec = ref / NSEC_PER_USEC;1787 1788	/* Compute clockid time. */1789	ref = ff->ph->env.clock.clockid_ns;1790	clockid_ns.tv_sec = ref / NSEC_PER_SEC;1791	ref -= clockid_ns.tv_sec * NSEC_PER_SEC;1792	clockid_ns.tv_nsec = ref;1793 1794	clockid = ff->ph->env.clock.clockid;1795 1796	if (localtime_r(&tod_ns.tv_sec, &ltime) == NULL)1797		snprintf(tstr, sizeof(tstr), "<error>");1798	else {1799		strftime(date, sizeof(date), "%F %T", &ltime);1800		scnprintf(tstr, sizeof(tstr), "%s.%06d",1801			  date, (int) tod_ns.tv_usec);1802	}1803 1804	fprintf(fp, "# clockid: %s (%u)\n", clockid_name(clockid), clockid);1805	fprintf(fp, "# reference time: %s = %ld.%06d (TOD) = %ld.%09ld (%s)\n",1806		    tstr, (long) tod_ns.tv_sec, (int) tod_ns.tv_usec,1807		    (long) clockid_ns.tv_sec, clockid_ns.tv_nsec,1808		    clockid_name(clockid));1809}1810 1811static void print_hybrid_topology(struct feat_fd *ff, FILE *fp)1812{1813	int i;1814	struct hybrid_node *n;1815 1816	fprintf(fp, "# hybrid cpu system:\n");1817	for (i = 0; i < ff->ph->env.nr_hybrid_nodes; i++) {1818		n = &ff->ph->env.hybrid_nodes[i];1819		fprintf(fp, "# %s cpu list : %s\n", n->pmu_name, n->cpus);1820	}1821}1822 1823static void print_dir_format(struct feat_fd *ff, FILE *fp)1824{1825	struct perf_session *session;1826	struct perf_data *data;1827 1828	session = container_of(ff->ph, struct perf_session, header);1829	data = session->data;1830 1831	fprintf(fp, "# directory data version : %"PRIu64"\n", data->dir.version);1832}1833 1834#ifdef HAVE_LIBBPF_SUPPORT1835static void print_bpf_prog_info(struct feat_fd *ff, FILE *fp)1836{1837	struct perf_env *env = &ff->ph->env;1838	struct rb_root *root;1839	struct rb_node *next;1840 1841	down_read(&env->bpf_progs.lock);1842 1843	root = &env->bpf_progs.infos;1844	next = rb_first(root);1845 1846	while (next) {1847		struct bpf_prog_info_node *node;1848 1849		node = rb_entry(next, struct bpf_prog_info_node, rb_node);1850		next = rb_next(&node->rb_node);1851 1852		__bpf_event__print_bpf_prog_info(&node->info_linear->info,1853						 env, fp);1854	}1855 1856	up_read(&env->bpf_progs.lock);1857}1858 1859static void print_bpf_btf(struct feat_fd *ff, FILE *fp)1860{1861	struct perf_env *env = &ff->ph->env;1862	struct rb_root *root;1863	struct rb_node *next;1864 1865	down_read(&env->bpf_progs.lock);1866 1867	root = &env->bpf_progs.btfs;1868	next = rb_first(root);1869 1870	while (next) {1871		struct btf_node *node;1872 1873		node = rb_entry(next, struct btf_node, rb_node);1874		next = rb_next(&node->rb_node);1875		fprintf(fp, "# btf info of id %u\n", node->id);1876	}1877 1878	up_read(&env->bpf_progs.lock);1879}1880#endif // HAVE_LIBBPF_SUPPORT1881 1882static void free_event_desc(struct evsel *events)1883{1884	struct evsel *evsel;1885 1886	if (!events)1887		return;1888 1889	for (evsel = events; evsel->core.attr.size; evsel++) {1890		zfree(&evsel->name);1891		zfree(&evsel->core.id);1892	}1893 1894	free(events);1895}1896 1897static bool perf_attr_check(struct perf_event_attr *attr)1898{1899	if (attr->__reserved_1 || attr->__reserved_2 || attr->__reserved_3) {1900		pr_warning("Reserved bits are set unexpectedly. "1901			   "Please update perf tool.\n");1902		return false;1903	}1904 1905	if (attr->sample_type & ~(PERF_SAMPLE_MAX-1)) {1906		pr_warning("Unknown sample type (0x%llx) is detected. "1907			   "Please update perf tool.\n",1908			   attr->sample_type);1909		return false;1910	}1911 1912	if (attr->read_format & ~(PERF_FORMAT_MAX-1)) {1913		pr_warning("Unknown read format (0x%llx) is detected. "1914			   "Please update perf tool.\n",1915			   attr->read_format);1916		return false;1917	}1918 1919	if ((attr->sample_type & PERF_SAMPLE_BRANCH_STACK) &&1920	    (attr->branch_sample_type & ~(PERF_SAMPLE_BRANCH_MAX-1))) {1921		pr_warning("Unknown branch sample type (0x%llx) is detected. "1922			   "Please update perf tool.\n",1923			   attr->branch_sample_type);1924 1925		return false;1926	}1927 1928	return true;1929}1930 1931static struct evsel *read_event_desc(struct feat_fd *ff)1932{1933	struct evsel *evsel, *events = NULL;1934	u64 *id;1935	void *buf = NULL;1936	u32 nre, sz, nr, i, j;1937	size_t msz;1938 1939	/* number of events */1940	if (do_read_u32(ff, &nre))1941		goto error;1942 1943	if (do_read_u32(ff, &sz))1944		goto error;1945 1946	/* buffer to hold on file attr struct */1947	buf = malloc(sz);1948	if (!buf)1949		goto error;1950 1951	/* the last event terminates with evsel->core.attr.size == 0: */1952	events = calloc(nre + 1, sizeof(*events));1953	if (!events)1954		goto error;1955 1956	msz = sizeof(evsel->core.attr);1957	if (sz < msz)1958		msz = sz;1959 1960	for (i = 0, evsel = events; i < nre; evsel++, i++) {1961		evsel->core.idx = i;1962 1963		/*1964		 * must read entire on-file attr struct to1965		 * sync up with layout.1966		 */1967		if (__do_read(ff, buf, sz))1968			goto error;1969 1970		if (ff->ph->needs_swap)1971			perf_event__attr_swap(buf);1972 1973		memcpy(&evsel->core.attr, buf, msz);1974 1975		if (!perf_attr_check(&evsel->core.attr))1976			goto error;1977 1978		if (do_read_u32(ff, &nr))1979			goto error;1980 1981		if (ff->ph->needs_swap)1982			evsel->needs_swap = true;1983 1984		evsel->name = do_read_string(ff);1985		if (!evsel->name)1986			goto error;1987 1988		if (!nr)1989			continue;1990 1991		id = calloc(nr, sizeof(*id));1992		if (!id)1993			goto error;1994		evsel->core.ids = nr;1995		evsel->core.id = id;1996 1997		for (j = 0 ; j < nr; j++) {1998			if (do_read_u64(ff, id))1999				goto error;2000			id++;2001		}2002	}2003out:2004	free(buf);2005	return events;2006error:2007	free_event_desc(events);2008	events = NULL;2009	goto out;2010}2011 2012static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,2013				void *priv __maybe_unused)2014{2015	return fprintf(fp, ", %s = %s", name, val);2016}2017 2018static void print_event_desc(struct feat_fd *ff, FILE *fp)2019{2020	struct evsel *evsel, *events;2021	u32 j;2022	u64 *id;2023 2024	if (ff->events)2025		events = ff->events;2026	else2027		events = read_event_desc(ff);2028 2029	if (!events) {2030		fprintf(fp, "# event desc: not available or unable to read\n");2031		return;2032	}2033 2034	for (evsel = events; evsel->core.attr.size; evsel++) {2035		fprintf(fp, "# event : name = %s, ", evsel->name);2036 2037		if (evsel->core.ids) {2038			fprintf(fp, ", id = {");2039			for (j = 0, id = evsel->core.id; j < evsel->core.ids; j++, id++) {2040				if (j)2041					fputc(',', fp);2042				fprintf(fp, " %"PRIu64, *id);2043			}2044			fprintf(fp, " }");2045		}2046 2047		perf_event_attr__fprintf(fp, &evsel->core.attr, __desc_attr__fprintf, NULL);2048 2049		fputc('\n', fp);2050	}2051 2052	free_event_desc(events);2053	ff->events = NULL;2054}2055 2056static void print_total_mem(struct feat_fd *ff, FILE *fp)2057{2058	fprintf(fp, "# total memory : %llu kB\n", ff->ph->env.total_mem);2059}2060 2061static void print_numa_topology(struct feat_fd *ff, FILE *fp)2062{2063	int i;2064	struct numa_node *n;2065 2066	for (i = 0; i < ff->ph->env.nr_numa_nodes; i++) {2067		n = &ff->ph->env.numa_nodes[i];2068 2069		fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"2070			    " free = %"PRIu64" kB\n",2071			n->node, n->mem_total, n->mem_free);2072 2073		fprintf(fp, "# node%u cpu list : ", n->node);2074		cpu_map__fprintf(n->map, fp);2075	}2076}2077 2078static void print_cpuid(struct feat_fd *ff, FILE *fp)2079{2080	fprintf(fp, "# cpuid : %s\n", ff->ph->env.cpuid);2081}2082 2083static void print_branch_stack(struct feat_fd *ff __maybe_unused, FILE *fp)2084{2085	fprintf(fp, "# contains samples with branch stack\n");2086}2087 2088static void print_auxtrace(struct feat_fd *ff __maybe_unused, FILE *fp)2089{2090	fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");2091}2092 2093static void print_stat(struct feat_fd *ff __maybe_unused, FILE *fp)2094{2095	fprintf(fp, "# contains stat data\n");2096}2097 2098static void print_cache(struct feat_fd *ff, FILE *fp __maybe_unused)2099{2100	int i;2101 2102	fprintf(fp, "# CPU cache info:\n");2103	for (i = 0; i < ff->ph->env.caches_cnt; i++) {2104		fprintf(fp, "#  ");2105		cpu_cache_level__fprintf(fp, &ff->ph->env.caches[i]);2106	}2107}2108 2109static void print_compressed(struct feat_fd *ff, FILE *fp)2110{2111	fprintf(fp, "# compressed : %s, level = %d, ratio = %d\n",2112		ff->ph->env.comp_type == PERF_COMP_ZSTD ? "Zstd" : "Unknown",2113		ff->ph->env.comp_level, ff->ph->env.comp_ratio);2114}2115 2116static void __print_pmu_caps(FILE *fp, int nr_caps, char **caps, char *pmu_name)2117{2118	const char *delimiter = "";2119	int i;2120 2121	if (!nr_caps) {2122		fprintf(fp, "# %s pmu capabilities: not available\n", pmu_name);2123		return;2124	}2125 2126	fprintf(fp, "# %s pmu capabilities: ", pmu_name);2127	for (i = 0; i < nr_caps; i++) {2128		fprintf(fp, "%s%s", delimiter, caps[i]);2129		delimiter = ", ";2130	}2131 2132	fprintf(fp, "\n");2133}2134 2135static void print_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)2136{2137	__print_pmu_caps(fp, ff->ph->env.nr_cpu_pmu_caps,2138			 ff->ph->env.cpu_pmu_caps, (char *)"cpu");2139}2140 2141static void print_pmu_caps(struct feat_fd *ff, FILE *fp)2142{2143	struct pmu_caps *pmu_caps;2144 2145	for (int i = 0; i < ff->ph->env.nr_pmus_with_caps; i++) {2146		pmu_caps = &ff->ph->env.pmu_caps[i];2147		__print_pmu_caps(fp, pmu_caps->nr_caps, pmu_caps->caps,2148				 pmu_caps->pmu_name);2149	}2150 2151	if (strcmp(perf_env__arch(&ff->ph->env), "x86") == 0 &&2152	    perf_env__has_pmu_mapping(&ff->ph->env, "ibs_op")) {2153		char *max_precise = perf_env__find_pmu_cap(&ff->ph->env, "cpu", "max_precise");2154 2155		if (max_precise != NULL && atoi(max_precise) == 0)2156			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");2157	}2158}2159 2160static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)2161{2162	const char *delimiter = "# pmu mappings: ";2163	char *str, *tmp;2164	u32 pmu_num;2165	u32 type;2166 2167	pmu_num = ff->ph->env.nr_pmu_mappings;2168	if (!pmu_num) {2169		fprintf(fp, "# pmu mappings: not available\n");2170		return;2171	}2172 2173	str = ff->ph->env.pmu_mappings;2174 2175	while (pmu_num) {2176		type = strtoul(str, &tmp, 0);2177		if (*tmp != ':')2178			goto error;2179 2180		str = tmp + 1;2181		fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);2182 2183		delimiter = ", ";2184		str += strlen(str) + 1;2185		pmu_num--;2186	}2187 2188	fprintf(fp, "\n");2189 2190	if (!pmu_num)2191		return;2192error:2193	fprintf(fp, "# pmu mappings: unable to read\n");2194}2195 2196static void print_group_desc(struct feat_fd *ff, FILE *fp)2197{2198	struct perf_session *session;2199	struct evsel *evsel;2200	u32 nr = 0;2201 2202	session = container_of(ff->ph, struct perf_session, header);2203 2204	evlist__for_each_entry(session->evlist, evsel) {2205		if (evsel__is_group_leader(evsel) && evsel->core.nr_members > 1) {2206			fprintf(fp, "# group: %s{%s", evsel->group_name ?: "", evsel__name(evsel));2207 2208			nr = evsel->core.nr_members - 1;2209		} else if (nr) {2210			fprintf(fp, ",%s", evsel__name(evsel));2211 2212			if (--nr == 0)2213				fprintf(fp, "}\n");2214		}2215	}2216}2217 2218static void print_sample_time(struct feat_fd *ff, FILE *fp)2219{2220	struct perf_session *session;2221	char time_buf[32];2222	double d;2223 2224	session = container_of(ff->ph, struct perf_session, header);2225 2226	timestamp__scnprintf_usec(session->evlist->first_sample_time,2227				  time_buf, sizeof(time_buf));2228	fprintf(fp, "# time of first sample : %s\n", time_buf);2229 2230	timestamp__scnprintf_usec(session->evlist->last_sample_time,2231				  time_buf, sizeof(time_buf));2232	fprintf(fp, "# time of last sample : %s\n", time_buf);2233 2234	d = (double)(session->evlist->last_sample_time -2235		session->evlist->first_sample_time) / NSEC_PER_MSEC;2236 2237	fprintf(fp, "# sample duration : %10.3f ms\n", d);2238}2239 2240static void memory_node__fprintf(struct memory_node *n,2241				 unsigned long long bsize, FILE *fp)2242{2243	char buf_map[100], buf_size[50];2244	unsigned long long size;2245 2246	size = bsize * bitmap_weight(n->set, n->size);2247	unit_number__scnprintf(buf_size, 50, size);2248 2249	bitmap_scnprintf(n->set, n->size, buf_map, 100);2250	fprintf(fp, "#  %3" PRIu64 " [%s]: %s\n", n->node, buf_size, buf_map);2251}2252 2253static void print_mem_topology(struct feat_fd *ff, FILE *fp)2254{2255	struct memory_node *nodes;2256	int i, nr;2257 2258	nodes = ff->ph->env.memory_nodes;2259	nr    = ff->ph->env.nr_memory_nodes;2260 2261	fprintf(fp, "# memory nodes (nr %d, block size 0x%llx):\n",2262		nr, ff->ph->env.memory_bsize);2263 2264	for (i = 0; i < nr; i++) {2265		memory_node__fprintf(&nodes[i], ff->ph->env.memory_bsize, fp);2266	}2267}2268 2269static int __event_process_build_id(struct perf_record_header_build_id *bev,2270				    char *filename,2271				    struct perf_session *session)2272{2273	int err = -1;2274	struct machine *machine;2275	u16 cpumode;2276	struct dso *dso;2277	enum dso_space_type dso_space;2278 2279	machine = perf_session__findnew_machine(session, bev->pid);2280	if (!machine)2281		goto out;2282 2283	cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;2284 2285	switch (cpumode) {2286	case PERF_RECORD_MISC_KERNEL:2287		dso_space = DSO_SPACE__KERNEL;2288		break;2289	case PERF_RECORD_MISC_GUEST_KERNEL:2290		dso_space = DSO_SPACE__KERNEL_GUEST;2291		break;2292	case PERF_RECORD_MISC_USER:2293	case PERF_RECORD_MISC_GUEST_USER:2294		dso_space = DSO_SPACE__USER;2295		break;2296	default:2297		goto out;2298	}2299 2300	dso = machine__findnew_dso(machine, filename);2301	if (dso != NULL) {2302		char sbuild_id[SBUILD_ID_SIZE];2303		struct build_id bid;2304		size_t size = BUILD_ID_SIZE;2305 2306		if (bev->header.misc & PERF_RECORD_MISC_BUILD_ID_SIZE)2307			size = bev->size;2308 2309		build_id__init(&bid, bev->data, size);2310		dso__set_build_id(dso, &bid);2311		dso__set_header_build_id(dso, true);2312 2313		if (dso_space != DSO_SPACE__USER) {2314			struct kmod_path m = { .name = NULL, };2315 2316			if (!kmod_path__parse_name(&m, filename) && m.kmod)2317				dso__set_module_info(dso, &m, machine);2318 2319			dso__set_kernel(dso, dso_space);2320			free(m.name);2321		}2322 2323		build_id__sprintf(dso__bid(dso), sbuild_id);2324		pr_debug("build id event received for %s: %s [%zu]\n",2325			 dso__long_name(dso), sbuild_id, size);2326		dso__put(dso);2327	}2328 2329	err = 0;2330out:2331	return err;2332}2333 2334static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,2335						 int input, u64 offset, u64 size)2336{2337	struct perf_session *session = container_of(header, struct perf_session, header);2338	struct {2339		struct perf_event_header   header;2340		u8			   build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];2341		char			   filename[0];2342	} old_bev;2343	struct perf_record_header_build_id bev;2344	char filename[PATH_MAX];2345	u64 limit = offset + size;2346 2347	while (offset < limit) {2348		ssize_t len;2349 2350		if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))2351			return -1;2352 2353		if (header->needs_swap)2354			perf_event_header__bswap(&old_bev.header);2355 2356		len = old_bev.header.size - sizeof(old_bev);2357		if (readn(input, filename, len) != len)2358			return -1;2359 2360		bev.header = old_bev.header;2361 2362		/*2363		 * As the pid is the missing value, we need to fill2364		 * it properly. The header.misc value give us nice hint.2365		 */2366		bev.pid	= HOST_KERNEL_ID;2367		if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||2368		    bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)2369			bev.pid	= DEFAULT_GUEST_KERNEL_ID;2370 2371		memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));2372		__event_process_build_id(&bev, filename, session);2373 2374		offset += bev.header.size;2375	}2376 2377	return 0;2378}2379 2380static int perf_header__read_build_ids(struct perf_header *header,2381				       int input, u64 offset, u64 size)2382{2383	struct perf_session *session = container_of(header, struct perf_session, header);2384	struct perf_record_header_build_id bev;2385	char filename[PATH_MAX];2386	u64 limit = offset + size, orig_offset = offset;2387	int err = -1;2388 2389	while (offset < limit) {2390		ssize_t len;2391 2392		if (readn(input, &bev, sizeof(bev)) != sizeof(bev))2393			goto out;2394 2395		if (header->needs_swap)2396			perf_event_header__bswap(&bev.header);2397 2398		len = bev.header.size - sizeof(bev);2399		if (readn(input, filename, len) != len)2400			goto out;2401		/*2402		 * The a1645ce1 changeset:2403		 *2404		 * "perf: 'perf kvm' tool for monitoring guest performance from host"2405		 *2406		 * Added a field to struct perf_record_header_build_id that broke the file2407		 * format.2408		 *2409		 * Since the kernel build-id is the first entry, process the2410		 * table using the old format if the well known2411		 * '[kernel.kallsyms]' string for the kernel build-id has the2412		 * first 4 characters chopped off (where the pid_t sits).2413		 */2414		if (memcmp(filename, "nel.kallsyms]", 13) == 0) {2415			if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)2416				return -1;2417			return perf_header__read_build_ids_abi_quirk(header, input, offset, size);2418		}2419 2420		__event_process_build_id(&bev, filename, session);2421 2422		offset += bev.header.size;2423	}2424	err = 0;2425out:2426	return err;2427}2428 2429/* Macro for features that simply need to read and store a string. */2430#define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \2431static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \2432{\2433	free(ff->ph->env.__feat_env);		     \2434	ff->ph->env.__feat_env = do_read_string(ff); \2435	return ff->ph->env.__feat_env ? 0 : -ENOMEM; \2436}2437 2438FEAT_PROCESS_STR_FUN(hostname, hostname);2439FEAT_PROCESS_STR_FUN(osrelease, os_release);2440FEAT_PROCESS_STR_FUN(version, version);2441FEAT_PROCESS_STR_FUN(arch, arch);2442FEAT_PROCESS_STR_FUN(cpudesc, cpu_desc);2443FEAT_PROCESS_STR_FUN(cpuid, cpuid);2444 2445#ifdef HAVE_LIBTRACEEVENT2446static int process_tracing_data(struct feat_fd *ff, void *data)2447{2448	ssize_t ret = trace_report(ff->fd, data, false);2449 2450	return ret < 0 ? -1 : 0;2451}2452#endif2453 2454static int process_build_id(struct feat_fd *ff, void *data __maybe_unused)2455{2456	if (perf_header__read_build_ids(ff->ph, ff->fd, ff->offset, ff->size))2457		pr_debug("Failed to read buildids, continuing...\n");2458	return 0;2459}2460 2461static int process_nrcpus(struct feat_fd *ff, void *data __maybe_unused)2462{2463	int ret;2464	u32 nr_cpus_avail, nr_cpus_online;2465 2466	ret = do_read_u32(ff, &nr_cpus_avail);2467	if (ret)2468		return ret;2469 2470	ret = do_read_u32(ff, &nr_cpus_online);2471	if (ret)2472		return ret;2473	ff->ph->env.nr_cpus_avail = (int)nr_cpus_avail;2474	ff->ph->env.nr_cpus_online = (int)nr_cpus_online;2475	return 0;2476}2477 2478static int process_total_mem(struct feat_fd *ff, void *data __maybe_unused)2479{2480	u64 total_mem;2481	int ret;2482 2483	ret = do_read_u64(ff, &total_mem);2484	if (ret)2485		return -1;2486	ff->ph->env.total_mem = (unsigned long long)total_mem;2487	return 0;2488}2489 2490static struct evsel *evlist__find_by_index(struct evlist *evlist, int idx)2491{2492	struct evsel *evsel;2493 2494	evlist__for_each_entry(evlist, evsel) {2495		if (evsel->core.idx == idx)2496			return evsel;2497	}2498 2499	return NULL;2500}2501 2502static void evlist__set_event_name(struct evlist *evlist, struct evsel *event)2503{2504	struct evsel *evsel;2505 2506	if (!event->name)2507		return;2508 2509	evsel = evlist__find_by_index(evlist, event->core.idx);2510	if (!evsel)2511		return;2512 2513	if (evsel->name)2514		return;2515 2516	evsel->name = strdup(event->name);2517}2518 2519static int2520process_event_desc(struct feat_fd *ff, void *data __maybe_unused)2521{2522	struct perf_session *session;2523	struct evsel *evsel, *events = read_event_desc(ff);2524 2525	if (!events)2526		return 0;2527 2528	session = container_of(ff->ph, struct perf_session, header);2529 2530	if (session->data->is_pipe) {2531		/* Save events for reading later by print_event_desc,2532		 * since they can't be read again in pipe mode. */2533		ff->events = events;2534	}2535 2536	for (evsel = events; evsel->core.attr.size; evsel++)2537		evlist__set_event_name(session->evlist, evsel);2538 2539	if (!session->data->is_pipe)2540		free_event_desc(events);2541 2542	return 0;2543}2544 2545static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)2546{2547	char *str, *cmdline = NULL, **argv = NULL;2548	u32 nr, i, len = 0;2549 2550	if (do_read_u32(ff, &nr))2551		return -1;2552 2553	ff->ph->env.nr_cmdline = nr;2554 2555	cmdline = zalloc(ff->size + nr + 1);2556	if (!cmdline)2557		return -1;2558 2559	argv = zalloc(sizeof(char *) * (nr + 1));2560	if (!argv)2561		goto error;2562 2563	for (i = 0; i < nr; i++) {2564		str = do_read_string(ff);2565		if (!str)2566			goto error;2567 2568		argv[i] = cmdline + len;2569		memcpy(argv[i], str, strlen(str) + 1);2570		len += strlen(str) + 1;2571		free(str);2572	}2573	ff->ph->env.cmdline = cmdline;2574	ff->ph->env.cmdline_argv = (const char **) argv;2575	return 0;2576 2577error:2578	free(argv);2579	free(cmdline);2580	return -1;2581}2582 2583static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)2584{2585	u32 nr, i;2586	char *str = NULL;2587	struct strbuf sb;2588	int cpu_nr = ff->ph->env.nr_cpus_avail;2589	u64 size = 0;2590	struct perf_header *ph = ff->ph;2591	bool do_core_id_test = true;2592 2593	ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));2594	if (!ph->env.cpu)2595		return -1;2596 2597	if (do_read_u32(ff, &nr))2598		goto free_cpu;2599 2600	ph->env.nr_sibling_cores = nr;2601	size += sizeof(u32);2602	if (strbuf_init(&sb, 128) < 0)2603		goto free_cpu;2604 2605	for (i = 0; i < nr; i++) {2606		str = do_read_string(ff);2607		if (!str)2608			goto error;2609 2610		/* include a NULL character at the end */2611		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)2612			goto error;2613		size += string_size(str);2614		zfree(&str);2615	}2616	ph->env.sibling_cores = strbuf_detach(&sb, NULL);2617 2618	if (do_read_u32(ff, &nr))2619		return -1;2620 2621	ph->env.nr_sibling_threads = nr;2622	size += sizeof(u32);2623 2624	for (i = 0; i < nr; i++) {2625		str = do_read_string(ff);2626		if (!str)2627			goto error;2628 2629		/* include a NULL character at the end */2630		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)2631			goto error;2632		size += string_size(str);2633		zfree(&str);2634	}2635	ph->env.sibling_threads = strbuf_detach(&sb, NULL);2636 2637	/*2638	 * The header may be from old perf,2639	 * which doesn't include core id and socket id information.2640	 */2641	if (ff->size <= size) {2642		zfree(&ph->env.cpu);2643		return 0;2644	}2645 2646	/* On s390 the socket_id number is not related to the numbers of cpus.2647	 * The socket_id number might be higher than the numbers of cpus.2648	 * This depends on the configuration.2649	 * AArch64 is the same.2650	 */2651	if (ph->env.arch && (!strncmp(ph->env.arch, "s390", 4)2652			  || !strncmp(ph->env.arch, "aarch64", 7)))2653		do_core_id_test = false;2654 2655	for (i = 0; i < (u32)cpu_nr; i++) {2656		if (do_read_u32(ff, &nr))2657			goto free_cpu;2658 2659		ph->env.cpu[i].core_id = nr;2660		size += sizeof(u32);2661 2662		if (do_read_u32(ff, &nr))2663			goto free_cpu;2664 2665		if (do_core_id_test && nr != (u32)-1 && nr > (u32)cpu_nr) {2666			pr_debug("socket_id number is too big."2667				 "You may need to upgrade the perf tool.\n");2668			goto free_cpu;2669		}2670 2671		ph->env.cpu[i].socket_id = nr;2672		size += sizeof(u32);2673	}2674 2675	/*2676	 * The header may be from old perf,2677	 * which doesn't include die information.2678	 */2679	if (ff->size <= size)2680		return 0;2681 2682	if (do_read_u32(ff, &nr))2683		return -1;2684 2685	ph->env.nr_sibling_dies = nr;2686	size += sizeof(u32);2687 2688	for (i = 0; i < nr; i++) {2689		str = do_read_string(ff);2690		if (!str)2691			goto error;2692 2693		/* include a NULL character at the end */2694		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)2695			goto error;2696		size += string_size(str);2697		zfree(&str);2698	}2699	ph->env.sibling_dies = strbuf_detach(&sb, NULL);2700 2701	for (i = 0; i < (u32)cpu_nr; i++) {2702		if (do_read_u32(ff, &nr))2703			goto free_cpu;2704 2705		ph->env.cpu[i].die_id = nr;2706	}2707 2708	return 0;2709 2710error:2711	strbuf_release(&sb);2712	zfree(&str);2713free_cpu:2714	zfree(&ph->env.cpu);2715	return -1;2716}2717 2718static int process_numa_topology(struct feat_fd *ff, void *data __maybe_unused)2719{2720	struct numa_node *nodes, *n;2721	u32 nr, i;2722	char *str;2723 2724	/* nr nodes */2725	if (do_read_u32(ff, &nr))2726		return -1;2727 2728	nodes = zalloc(sizeof(*nodes) * nr);2729	if (!nodes)2730		return -ENOMEM;2731 2732	for (i = 0; i < nr; i++) {2733		n = &nodes[i];2734 2735		/* node number */2736		if (do_read_u32(ff, &n->node))2737			goto error;2738 2739		if (do_read_u64(ff, &n->mem_total))2740			goto error;2741 2742		if (do_read_u64(ff, &n->mem_free))2743			goto error;2744 2745		str = do_read_string(ff);2746		if (!str)2747			goto error;2748 2749		n->map = perf_cpu_map__new(str);2750		free(str);2751		if (!n->map)2752			goto error;2753	}2754	ff->ph->env.nr_numa_nodes = nr;2755	ff->ph->env.numa_nodes = nodes;2756	return 0;2757 2758error:2759	free(nodes);2760	return -1;2761}2762 2763static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)2764{2765	char *name;2766	u32 pmu_num;2767	u32 type;2768	struct strbuf sb;2769 2770	if (do_read_u32(ff, &pmu_num))2771		return -1;2772 2773	if (!pmu_num) {2774		pr_debug("pmu mappings not available\n");2775		return 0;2776	}2777 2778	ff->ph->env.nr_pmu_mappings = pmu_num;2779	if (strbuf_init(&sb, 128) < 0)2780		return -1;2781 2782	while (pmu_num) {2783		if (do_read_u32(ff, &type))2784			goto error;2785 2786		name = do_read_string(ff);2787		if (!name)2788			goto error;2789 2790		if (strbuf_addf(&sb, "%u:%s", type, name) < 0)2791			goto error;2792		/* include a NULL character at the end */2793		if (strbuf_add(&sb, "", 1) < 0)2794			goto error;2795 2796		if (!strcmp(name, "msr"))2797			ff->ph->env.msr_pmu_type = type;2798 2799		free(name);2800		pmu_num--;2801	}2802	ff->ph->env.pmu_mappings = strbuf_detach(&sb, NULL);2803	return 0;2804 2805error:2806	strbuf_release(&sb);2807	return -1;2808}2809 2810static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)2811{2812	size_t ret = -1;2813	u32 i, nr, nr_groups;2814	struct perf_session *session;2815	struct evsel *evsel, *leader = NULL;2816	struct group_desc {2817		char *name;2818		u32 leader_idx;2819		u32 nr_members;2820	} *desc;2821 2822	if (do_read_u32(ff, &nr_groups))2823		return -1;2824 2825	ff->ph->env.nr_groups = nr_groups;2826	if (!nr_groups) {2827		pr_debug("group desc not available\n");2828		return 0;2829	}2830 2831	desc = calloc(nr_groups, sizeof(*desc));2832	if (!desc)2833		return -1;2834 2835	for (i = 0; i < nr_groups; i++) {2836		desc[i].name = do_read_string(ff);2837		if (!desc[i].name)2838			goto out_free;2839 2840		if (do_read_u32(ff, &desc[i].leader_idx))2841			goto out_free;2842 2843		if (do_read_u32(ff, &desc[i].nr_members))2844			goto out_free;2845	}2846 2847	/*2848	 * Rebuild group relationship based on the group_desc2849	 */2850	session = container_of(ff->ph, struct perf_session, header);2851 2852	i = nr = 0;2853	evlist__for_each_entry(session->evlist, evsel) {2854		if (i < nr_groups && evsel->core.idx == (int) desc[i].leader_idx) {2855			evsel__set_leader(evsel, evsel);2856			/* {anon_group} is a dummy name */2857			if (strcmp(desc[i].name, "{anon_group}")) {2858				evsel->group_name = desc[i].name;2859				desc[i].name = NULL;2860			}2861			evsel->core.nr_members = desc[i].nr_members;2862 2863			if (i >= nr_groups || nr > 0) {2864				pr_debug("invalid group desc\n");2865				goto out_free;2866			}2867 2868			leader = evsel;2869			nr = evsel->core.nr_members - 1;2870			i++;2871		} else if (nr) {2872			/* This is a group member */2873			evsel__set_leader(evsel, leader);2874 2875			nr--;2876		}2877	}2878 2879	if (i != nr_groups || nr != 0) {2880		pr_debug("invalid group desc\n");2881		goto out_free;2882	}2883 2884	ret = 0;2885out_free:2886	for (i = 0; i < nr_groups; i++)2887		zfree(&desc[i].name);2888	free(desc);2889 2890	return ret;2891}2892 2893static int process_auxtrace(struct feat_fd *ff, void *data __maybe_unused)2894{2895	struct perf_session *session;2896	int err;2897 2898	session = container_of(ff->ph, struct perf_session, header);2899 2900	err = auxtrace_index__process(ff->fd, ff->size, session,2901				      ff->ph->needs_swap);2902	if (err < 0)2903		pr_err("Failed to process auxtrace index\n");2904	return err;2905}2906 2907static int process_cache(struct feat_fd *ff, void *data __maybe_unused)2908{2909	struct cpu_cache_level *caches;2910	u32 cnt, i, version;2911 2912	if (do_read_u32(ff, &version))2913		return -1;2914 2915	if (version != 1)2916		return -1;2917 2918	if (do_read_u32(ff, &cnt))2919		return -1;2920 2921	caches = zalloc(sizeof(*caches) * cnt);2922	if (!caches)2923		return -1;2924 2925	for (i = 0; i < cnt; i++) {2926		struct cpu_cache_level *c = &caches[i];2927 2928		#define _R(v)						\2929			if (do_read_u32(ff, &c->v))			\2930				goto out_free_caches;			\2931 2932		_R(level)2933		_R(line_size)2934		_R(sets)2935		_R(ways)2936		#undef _R2937 2938		#define _R(v)					\2939			c->v = do_read_string(ff);		\2940			if (!c->v)				\2941				goto out_free_caches;		\2942 2943		_R(type)2944		_R(size)2945		_R(map)2946		#undef _R2947	}2948 2949	ff->ph->env.caches = caches;2950	ff->ph->env.caches_cnt = cnt;2951	return 0;2952out_free_caches:2953	for (i = 0; i < cnt; i++) {2954		free(caches[i].type);2955		free(caches[i].size);2956		free(caches[i].map);2957	}2958	free(caches);2959	return -1;2960}2961 2962static int process_sample_time(struct feat_fd *ff, void *data __maybe_unused)2963{2964	struct perf_session *session;2965	u64 first_sample_time, last_sample_time;2966	int ret;2967 2968	session = container_of(ff->ph, struct perf_session, header);2969 2970	ret = do_read_u64(ff, &first_sample_time);2971	if (ret)2972		return -1;2973 2974	ret = do_read_u64(ff, &last_sample_time);2975	if (ret)2976		return -1;2977 2978	session->evlist->first_sample_time = first_sample_time;2979	session->evlist->last_sample_time = last_sample_time;2980	return 0;2981}2982 2983static int process_mem_topology(struct feat_fd *ff,2984				void *data __maybe_unused)2985{2986	struct memory_node *nodes;2987	u64 version, i, nr, bsize;2988	int ret = -1;2989 2990	if (do_read_u64(ff, &version))2991		return -1;2992 2993	if (version != 1)2994		return -1;2995 2996	if (do_read_u64(ff, &bsize))2997		return -1;2998 2999	if (do_read_u64(ff, &nr))3000		return -1;3001 3002	nodes = zalloc(sizeof(*nodes) * nr);3003	if (!nodes)3004		return -1;3005 3006	for (i = 0; i < nr; i++) {3007		struct memory_node n;3008 3009		#define _R(v)				\3010			if (do_read_u64(ff, &n.v))	\3011				goto out;		\3012 3013		_R(node)3014		_R(size)3015 3016		#undef _R3017 3018		if (do_read_bitmap(ff, &n.set, &n.size))3019			goto out;3020 3021		nodes[i] = n;3022	}3023 3024	ff->ph->env.memory_bsize    = bsize;3025	ff->ph->env.memory_nodes    = nodes;3026	ff->ph->env.nr_memory_nodes = nr;3027	ret = 0;3028 3029out:3030	if (ret)3031		free(nodes);3032	return ret;3033}3034 3035static int process_clockid(struct feat_fd *ff,3036			   void *data __maybe_unused)3037{3038	if (do_read_u64(ff, &ff->ph->env.clock.clockid_res_ns))3039		return -1;3040 3041	return 0;3042}3043 3044static int process_clock_data(struct feat_fd *ff,3045			      void *_data __maybe_unused)3046{3047	u32 data32;3048	u64 data64;3049 3050	/* version */3051	if (do_read_u32(ff, &data32))3052		return -1;3053 3054	if (data32 != 1)3055		return -1;3056 3057	/* clockid */3058	if (do_read_u32(ff, &data32))3059		return -1;3060 3061	ff->ph->env.clock.clockid = data32;3062 3063	/* TOD ref time */3064	if (do_read_u64(ff, &data64))3065		return -1;3066 3067	ff->ph->env.clock.tod_ns = data64;3068 3069	/* clockid ref time */3070	if (do_read_u64(ff, &data64))3071		return -1;3072 3073	ff->ph->env.clock.clockid_ns = data64;3074	ff->ph->env.clock.enabled = true;3075	return 0;3076}3077 3078static int process_hybrid_topology(struct feat_fd *ff,3079				   void *data __maybe_unused)3080{3081	struct hybrid_node *nodes, *n;3082	u32 nr, i;3083 3084	/* nr nodes */3085	if (do_read_u32(ff, &nr))3086		return -1;3087 3088	nodes = zalloc(sizeof(*nodes) * nr);3089	if (!nodes)3090		return -ENOMEM;3091 3092	for (i = 0; i < nr; i++) {3093		n = &nodes[i];3094 3095		n->pmu_name = do_read_string(ff);3096		if (!n->pmu_name)3097			goto error;3098 3099		n->cpus = do_read_string(ff);3100		if (!n->cpus)3101			goto error;3102	}3103 3104	ff->ph->env.nr_hybrid_nodes = nr;3105	ff->ph->env.hybrid_nodes = nodes;3106	return 0;3107 3108error:3109	for (i = 0; i < nr; i++) {3110		free(nodes[i].pmu_name);3111		free(nodes[i].cpus);3112	}3113 3114	free(nodes);3115	return -1;3116}3117 3118static int process_dir_format(struct feat_fd *ff,3119			      void *_data __maybe_unused)3120{3121	struct perf_session *session;3122	struct perf_data *data;3123 3124	session = container_of(ff->ph, struct perf_session, header);3125	data = session->data;3126 3127	if (WARN_ON(!perf_data__is_dir(data)))3128		return -1;3129 3130	return do_read_u64(ff, &data->dir.version);3131}3132 3133#ifdef HAVE_LIBBPF_SUPPORT3134static int process_bpf_prog_info(struct feat_fd *ff, void *data __maybe_unused)3135{3136	struct bpf_prog_info_node *info_node;3137	struct perf_env *env = &ff->ph->env;3138	struct perf_bpil *info_linear;3139	u32 count, i;3140	int err = -1;3141 3142	if (ff->ph->needs_swap) {3143		pr_warning("interpreting bpf_prog_info from systems with endianness is not yet supported\n");3144		return 0;3145	}3146 3147	if (do_read_u32(ff, &count))3148		return -1;3149 3150	down_write(&env->bpf_progs.lock);3151 3152	for (i = 0; i < count; ++i) {3153		u32 info_len, data_len;3154 3155		info_linear = NULL;3156		info_node = NULL;3157		if (do_read_u32(ff, &info_len))3158			goto out;3159		if (do_read_u32(ff, &data_len))3160			goto out;3161 3162		if (info_len > sizeof(struct bpf_prog_info)) {3163			pr_warning("detected invalid bpf_prog_info\n");3164			goto out;3165		}3166 3167		info_linear = malloc(sizeof(struct perf_bpil) +3168				     data_len);3169		if (!info_linear)3170			goto out;3171		info_linear->info_len = sizeof(struct bpf_prog_info);3172		info_linear->data_len = data_len;3173		if (do_read_u64(ff, (u64 *)(&info_linear->arrays)))3174			goto out;3175		if (__do_read(ff, &info_linear->info, info_len))3176			goto out;3177		if (info_len < sizeof(struct bpf_prog_info))3178			memset(((void *)(&info_linear->info)) + info_len, 0,3179			       sizeof(struct bpf_prog_info) - info_len);3180 3181		if (__do_read(ff, info_linear->data, data_len))3182			goto out;3183 3184		info_node = malloc(sizeof(struct bpf_prog_info_node));3185		if (!info_node)3186			goto out;3187 3188		/* after reading from file, translate offset to address */3189		bpil_offs_to_addr(info_linear);3190		info_node->info_linear = info_linear;3191		__perf_env__insert_bpf_prog_info(env, info_node);3192	}3193 3194	up_write(&env->bpf_progs.lock);3195	return 0;3196out:3197	free(info_linear);3198	free(info_node);3199	up_write(&env->bpf_progs.lock);3200	return err;3201}3202 3203static int process_bpf_btf(struct feat_fd *ff, void *data __maybe_unused)3204{3205	struct perf_env *env = &ff->ph->env;3206	struct btf_node *node = NULL;3207	u32 count, i;3208	int err = -1;3209 3210	if (ff->ph->needs_swap) {3211		pr_warning("interpreting btf from systems with endianness is not yet supported\n");3212		return 0;3213	}3214 3215	if (do_read_u32(ff, &count))3216		return -1;3217 3218	down_write(&env->bpf_progs.lock);3219 3220	for (i = 0; i < count; ++i) {3221		u32 id, data_size;3222 3223		if (do_read_u32(ff, &id))3224			goto out;3225		if (do_read_u32(ff, &data_size))3226			goto out;3227 3228		node = malloc(sizeof(struct btf_node) + data_size);3229		if (!node)3230			goto out;3231 3232		node->id = id;3233		node->data_size = data_size;3234 3235		if (__do_read(ff, node->data, data_size))3236			goto out;3237 3238		__perf_env__insert_btf(env, node);3239		node = NULL;3240	}3241 3242	err = 0;3243out:3244	up_write(&env->bpf_progs.lock);3245	free(node);3246	return err;3247}3248#endif // HAVE_LIBBPF_SUPPORT3249 3250static int process_compressed(struct feat_fd *ff,3251			      void *data __maybe_unused)3252{3253	if (do_read_u32(ff, &(ff->ph->env.comp_ver)))3254		return -1;3255 3256	if (do_read_u32(ff, &(ff->ph->env.comp_type)))3257		return -1;3258 3259	if (do_read_u32(ff, &(ff->ph->env.comp_level)))3260		return -1;3261 3262	if (do_read_u32(ff, &(ff->ph->env.comp_ratio)))3263		return -1;3264 3265	if (do_read_u32(ff, &(ff->ph->env.comp_mmap_len)))3266		return -1;3267 3268	return 0;3269}3270 3271static int __process_pmu_caps(struct feat_fd *ff, int *nr_caps,3272			      char ***caps, unsigned int *max_branches,3273			      unsigned int *br_cntr_nr,3274			      unsigned int *br_cntr_width)3275{3276	char *name, *value, *ptr;3277	u32 nr_pmu_caps, i;3278 3279	*nr_caps = 0;3280	*caps = NULL;3281 3282	if (do_read_u32(ff, &nr_pmu_caps))3283		return -1;3284 3285	if (!nr_pmu_caps)3286		return 0;3287 3288	*caps = zalloc(sizeof(char *) * nr_pmu_caps);3289	if (!*caps)3290		return -1;3291 3292	for (i = 0; i < nr_pmu_caps; i++) {3293		name = do_read_string(ff);3294		if (!name)3295			goto error;3296 3297		value = do_read_string(ff);3298		if (!value)3299			goto free_name;3300 3301		if (asprintf(&ptr, "%s=%s", name, value) < 0)3302			goto free_value;3303 3304		(*caps)[i] = ptr;3305 3306		if (!strcmp(name, "branches"))3307			*max_branches = atoi(value);3308 3309		if (!strcmp(name, "branch_counter_nr"))3310			*br_cntr_nr = atoi(value);3311 3312		if (!strcmp(name, "branch_counter_width"))3313			*br_cntr_width = atoi(value);3314 3315		free(value);3316		free(name);3317	}3318	*nr_caps = nr_pmu_caps;3319	return 0;3320 3321free_value:3322	free(value);3323free_name:3324	free(name);3325error:3326	for (; i > 0; i--)3327		free((*caps)[i - 1]);3328	free(*caps);3329	*caps = NULL;3330	*nr_caps = 0;3331	return -1;3332}3333 3334static int process_cpu_pmu_caps(struct feat_fd *ff,3335				void *data __maybe_unused)3336{3337	int ret = __process_pmu_caps(ff, &ff->ph->env.nr_cpu_pmu_caps,3338				     &ff->ph->env.cpu_pmu_caps,3339				     &ff->ph->env.max_branches,3340				     &ff->ph->env.br_cntr_nr,3341				     &ff->ph->env.br_cntr_width);3342 3343	if (!ret && !ff->ph->env.cpu_pmu_caps)3344		pr_debug("cpu pmu capabilities not available\n");3345	return ret;3346}3347 3348static int process_pmu_caps(struct feat_fd *ff, void *data __maybe_unused)3349{3350	struct pmu_caps *pmu_caps;3351	u32 nr_pmu, i;3352	int ret;3353	int j;3354 3355	if (do_read_u32(ff, &nr_pmu))3356		return -1;3357 3358	if (!nr_pmu) {3359		pr_debug("pmu capabilities not available\n");3360		return 0;3361	}3362 3363	pmu_caps = zalloc(sizeof(*pmu_caps) * nr_pmu);3364	if (!pmu_caps)3365		return -ENOMEM;3366 3367	for (i = 0; i < nr_pmu; i++) {3368		ret = __process_pmu_caps(ff, &pmu_caps[i].nr_caps,3369					 &pmu_caps[i].caps,3370					 &pmu_caps[i].max_branches,3371					 &pmu_caps[i].br_cntr_nr,3372					 &pmu_caps[i].br_cntr_width);3373		if (ret)3374			goto err;3375 3376		pmu_caps[i].pmu_name = do_read_string(ff);3377		if (!pmu_caps[i].pmu_name) {3378			ret = -1;3379			goto err;3380		}3381		if (!pmu_caps[i].nr_caps) {3382			pr_debug("%s pmu capabilities not available\n",3383				 pmu_caps[i].pmu_name);3384		}3385	}3386 3387	ff->ph->env.nr_pmus_with_caps = nr_pmu;3388	ff->ph->env.pmu_caps = pmu_caps;3389	return 0;3390 3391err:3392	for (i = 0; i < nr_pmu; i++) {3393		for (j = 0; j < pmu_caps[i].nr_caps; j++)3394			free(pmu_caps[i].caps[j]);3395		free(pmu_caps[i].caps);3396		free(pmu_caps[i].pmu_name);3397	}3398 3399	free(pmu_caps);3400	return ret;3401}3402 3403#define FEAT_OPR(n, func, __full_only) \3404	[HEADER_##n] = {					\3405		.name	    = __stringify(n),			\3406		.write	    = write_##func,			\3407		.print	    = print_##func,			\3408		.full_only  = __full_only,			\3409		.process    = process_##func,			\3410		.synthesize = true				\3411	}3412 3413#define FEAT_OPN(n, func, __full_only) \3414	[HEADER_##n] = {					\3415		.name	    = __stringify(n),			\3416		.write	    = write_##func,			\3417		.print	    = print_##func,			\3418		.full_only  = __full_only,			\3419		.process    = process_##func			\3420	}3421 3422/* feature_ops not implemented: */3423#define print_tracing_data	NULL3424#define print_build_id		NULL3425 3426#define process_branch_stack	NULL3427#define process_stat		NULL3428 3429// Only used in util/synthetic-events.c3430const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];3431 3432const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = {3433#ifdef HAVE_LIBTRACEEVENT3434	FEAT_OPN(TRACING_DATA,	tracing_data,	false),3435#endif3436	FEAT_OPN(BUILD_ID,	build_id,	false),3437	FEAT_OPR(HOSTNAME,	hostname,	false),3438	FEAT_OPR(OSRELEASE,	osrelease,	false),3439	FEAT_OPR(VERSION,	version,	false),3440	FEAT_OPR(ARCH,		arch,		false),3441	FEAT_OPR(NRCPUS,	nrcpus,		false),3442	FEAT_OPR(CPUDESC,	cpudesc,	false),3443	FEAT_OPR(CPUID,		cpuid,		false),3444	FEAT_OPR(TOTAL_MEM,	total_mem,	false),3445	FEAT_OPR(EVENT_DESC,	event_desc,	false),3446	FEAT_OPR(CMDLINE,	cmdline,	false),3447	FEAT_OPR(CPU_TOPOLOGY,	cpu_topology,	true),3448	FEAT_OPR(NUMA_TOPOLOGY,	numa_topology,	true),3449	FEAT_OPN(BRANCH_STACK,	branch_stack,	false),3450	FEAT_OPR(PMU_MAPPINGS,	pmu_mappings,	false),3451	FEAT_OPR(GROUP_DESC,	group_desc,	false),3452	FEAT_OPN(AUXTRACE,	auxtrace,	false),3453	FEAT_OPN(STAT,		stat,		false),3454	FEAT_OPN(CACHE,		cache,		true),3455	FEAT_OPR(SAMPLE_TIME,	sample_time,	false),3456	FEAT_OPR(MEM_TOPOLOGY,	mem_topology,	true),3457	FEAT_OPR(CLOCKID,	clockid,	false),3458	FEAT_OPN(DIR_FORMAT,	dir_format,	false),3459#ifdef HAVE_LIBBPF_SUPPORT3460	FEAT_OPR(BPF_PROG_INFO, bpf_prog_info,  false),3461	FEAT_OPR(BPF_BTF,       bpf_btf,        false),3462#endif3463	FEAT_OPR(COMPRESSED,	compressed,	false),3464	FEAT_OPR(CPU_PMU_CAPS,	cpu_pmu_caps,	false),3465	FEAT_OPR(CLOCK_DATA,	clock_data,	false),3466	FEAT_OPN(HYBRID_TOPOLOGY,	hybrid_topology,	true),3467	FEAT_OPR(PMU_CAPS,	pmu_caps,	false),3468};3469 3470struct header_print_data {3471	FILE *fp;3472	bool full; /* extended list of headers */3473};3474 3475static int perf_file_section__fprintf_info(struct perf_file_section *section,3476					   struct perf_header *ph,3477					   int feat, int fd, void *data)3478{3479	struct header_print_data *hd = data;3480	struct feat_fd ff;3481 3482	if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {3483		pr_debug("Failed to lseek to %" PRIu64 " offset for feature "3484				"%d, continuing...\n", section->offset, feat);3485		return 0;3486	}3487	if (feat >= HEADER_LAST_FEATURE) {3488		pr_warning("unknown feature %d\n", feat);3489		return 0;3490	}3491	if (!feat_ops[feat].print)3492		return 0;3493 3494	ff = (struct  feat_fd) {3495		.fd = fd,3496		.ph = ph,3497	};3498 3499	if (!feat_ops[feat].full_only || hd->full)3500		feat_ops[feat].print(&ff, hd->fp);3501	else3502		fprintf(hd->fp, "# %s info available, use -I to display\n",3503			feat_ops[feat].name);3504 3505	return 0;3506}3507 3508int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)3509{3510	struct header_print_data hd;3511	struct perf_header *header = &session->header;3512	int fd = perf_data__fd(session->data);3513	struct stat st;3514	time_t stctime;3515	int ret, bit;3516 3517	hd.fp = fp;3518	hd.full = full;3519 3520	ret = fstat(fd, &st);3521	if (ret == -1)3522		return -1;3523 3524	stctime = st.st_mtime;3525	fprintf(fp, "# captured on    : %s", ctime(&stctime));3526 3527	fprintf(fp, "# header version : %u\n", header->version);3528	fprintf(fp, "# data offset    : %" PRIu64 "\n", header->data_offset);3529	fprintf(fp, "# data size      : %" PRIu64 "\n", header->data_size);3530	fprintf(fp, "# feat offset    : %" PRIu64 "\n", header->feat_offset);3531 3532	perf_header__process_sections(header, fd, &hd,3533				      perf_file_section__fprintf_info);3534 3535	if (session->data->is_pipe)3536		return 0;3537 3538	fprintf(fp, "# missing features: ");3539	for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {3540		if (bit)3541			fprintf(fp, "%s ", feat_ops[bit].name);3542	}3543 3544	fprintf(fp, "\n");3545	return 0;3546}3547 3548struct header_fw {3549	struct feat_writer	fw;3550	struct feat_fd		*ff;3551};3552 3553static int feat_writer_cb(struct feat_writer *fw, void *buf, size_t sz)3554{3555	struct header_fw *h = container_of(fw, struct header_fw, fw);3556 3557	return do_write(h->ff, buf, sz);3558}3559 3560static int do_write_feat(struct feat_fd *ff, int type,3561			 struct perf_file_section **p,3562			 struct evlist *evlist,3563			 struct feat_copier *fc)3564{3565	int err;3566	int ret = 0;3567 3568	if (perf_header__has_feat(ff->ph, type)) {3569		if (!feat_ops[type].write)3570			return -1;3571 3572		if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))3573			return -1;3574 3575		(*p)->offset = lseek(ff->fd, 0, SEEK_CUR);3576 3577		/*3578		 * Hook to let perf inject copy features sections from the input3579		 * file.3580		 */3581		if (fc && fc->copy) {3582			struct header_fw h = {3583				.fw.write = feat_writer_cb,3584				.ff = ff,3585			};3586 3587			/* ->copy() returns 0 if the feature was not copied */3588			err = fc->copy(fc, type, &h.fw);3589		} else {3590			err = 0;3591		}3592		if (!err)3593			err = feat_ops[type].write(ff, evlist);3594		if (err < 0) {3595			pr_debug("failed to write feature %s\n", feat_ops[type].name);3596 3597			/* undo anything written */3598			lseek(ff->fd, (*p)->offset, SEEK_SET);3599 3600			return -1;3601		}3602		(*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;3603		(*p)++;3604	}3605	return ret;3606}3607 3608static int perf_header__adds_write(struct perf_header *header,3609				   struct evlist *evlist, int fd,3610				   struct feat_copier *fc)3611{3612	int nr_sections;3613	struct feat_fd ff = {3614		.fd  = fd,3615		.ph = header,3616	};3617	struct perf_file_section *feat_sec, *p;3618	int sec_size;3619	u64 sec_start;3620	int feat;3621	int err;3622 3623	nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);3624	if (!nr_sections)3625		return 0;3626 3627	feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));3628	if (feat_sec == NULL)3629		return -ENOMEM;3630 3631	sec_size = sizeof(*feat_sec) * nr_sections;3632 3633	sec_start = header->feat_offset;3634	lseek(fd, sec_start + sec_size, SEEK_SET);3635 3636	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {3637		if (do_write_feat(&ff, feat, &p, evlist, fc))3638			perf_header__clear_feat(header, feat);3639	}3640 3641	lseek(fd, sec_start, SEEK_SET);3642	/*3643	 * may write more than needed due to dropped feature, but3644	 * this is okay, reader will skip the missing entries3645	 */3646	err = do_write(&ff, feat_sec, sec_size);3647	if (err < 0)3648		pr_debug("failed to write feature section\n");3649	free(ff.buf); /* TODO: added to silence clang-tidy. */3650	free(feat_sec);3651	return err;3652}3653 3654int perf_header__write_pipe(int fd)3655{3656	struct perf_pipe_file_header f_header;3657	struct feat_fd ff = {3658		.fd = fd,3659	};3660	int err;3661 3662	f_header = (struct perf_pipe_file_header){3663		.magic	   = PERF_MAGIC,3664		.size	   = sizeof(f_header),3665	};3666 3667	err = do_write(&ff, &f_header, sizeof(f_header));3668	if (err < 0) {3669		pr_debug("failed to write perf pipe header\n");3670		return err;3671	}3672	free(ff.buf);3673	return 0;3674}3675 3676static int perf_session__do_write_header(struct perf_session *session,3677					 struct evlist *evlist,3678					 int fd, bool at_exit,3679					 struct feat_copier *fc,3680					 bool write_attrs_after_data)3681{3682	struct perf_file_header f_header;3683	struct perf_header *header = &session->header;3684	struct evsel *evsel;3685	struct feat_fd ff = {3686		.fd = fd,3687	};3688	u64 attr_offset = sizeof(f_header), attr_size = 0;3689	int err;3690 3691	if (write_attrs_after_data && at_exit) {3692		/*3693		 * Write features at the end of the file first so that3694		 * attributes may come after them.3695		 */3696		if (!header->data_offset && header->data_size) {3697			pr_err("File contains data but offset unknown\n");3698			err = -1;3699			goto err_out;3700		}3701		header->feat_offset = header->data_offset + header->data_size;3702		err = perf_header__adds_write(header, evlist, fd, fc);3703		if (err < 0)3704			goto err_out;3705		attr_offset = lseek(fd, 0, SEEK_CUR);3706	} else {3707		lseek(fd, attr_offset, SEEK_SET);3708	}3709 3710	evlist__for_each_entry(session->evlist, evsel) {3711		evsel->id_offset = attr_offset;3712		/* Avoid writing at the end of the file until the session is exiting. */3713		if (!write_attrs_after_data || at_exit) {3714			err = do_write(&ff, evsel->core.id, evsel->core.ids * sizeof(u64));3715			if (err < 0) {3716				pr_debug("failed to write perf header\n");3717				goto err_out;3718			}3719		}3720		attr_offset += evsel->core.ids * sizeof(u64);3721	}3722 3723	evlist__for_each_entry(evlist, evsel) {3724		if (evsel->core.attr.size < sizeof(evsel->core.attr)) {3725			/*3726			 * We are likely in "perf inject" and have read3727			 * from an older file. Update attr size so that3728			 * reader gets the right offset to the ids.3729			 */3730			evsel->core.attr.size = sizeof(evsel->core.attr);3731		}3732		/* Avoid writing at the end of the file until the session is exiting. */3733		if (!write_attrs_after_data || at_exit) {3734			struct perf_file_attr f_attr = {3735				.attr = evsel->core.attr,3736				.ids  = {3737					.offset = evsel->id_offset,3738					.size   = evsel->core.ids * sizeof(u64),3739				}3740			};3741			err = do_write(&ff, &f_attr, sizeof(f_attr));3742			if (err < 0) {3743				pr_debug("failed to write perf header attribute\n");3744				goto err_out;3745			}3746		}3747		attr_size += sizeof(struct perf_file_attr);3748	}3749 3750	if (!header->data_offset) {3751		if (write_attrs_after_data)3752			header->data_offset = sizeof(f_header);3753		else3754			header->data_offset = attr_offset + attr_size;3755	}3756	header->feat_offset = header->data_offset + header->data_size;3757 3758	if (!write_attrs_after_data && at_exit) {3759		/* Write features now feat_offset is known. */3760		err = perf_header__adds_write(header, evlist, fd, fc);3761		if (err < 0)3762			goto err_out;3763	}3764 3765	f_header = (struct perf_file_header){3766		.magic	   = PERF_MAGIC,3767		.size	   = sizeof(f_header),3768		.attr_size = sizeof(struct perf_file_attr),3769		.attrs = {3770			.offset = attr_offset,3771			.size   = attr_size,3772		},3773		.data = {3774			.offset = header->data_offset,3775			.size	= header->data_size,3776		},3777		/* event_types is ignored, store zeros */3778	};3779 3780	memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));3781 3782	lseek(fd, 0, SEEK_SET);3783	err = do_write(&ff, &f_header, sizeof(f_header));3784	if (err < 0) {3785		pr_debug("failed to write perf header\n");3786		goto err_out;3787	} else {3788		lseek(fd, 0, SEEK_END);3789		err = 0;3790	}3791err_out:3792	free(ff.buf);3793	return err;3794}3795 3796int perf_session__write_header(struct perf_session *session,3797			       struct evlist *evlist,3798			       int fd, bool at_exit)3799{3800	return perf_session__do_write_header(session, evlist, fd, at_exit, /*fc=*/NULL,3801					     /*write_attrs_after_data=*/false);3802}3803 3804size_t perf_session__data_offset(const struct evlist *evlist)3805{3806	struct evsel *evsel;3807	size_t data_offset;3808 3809	data_offset = sizeof(struct perf_file_header);3810	evlist__for_each_entry(evlist, evsel) {3811		data_offset += evsel->core.ids * sizeof(u64);3812	}3813	data_offset += evlist->core.nr_entries * sizeof(struct perf_file_attr);3814 3815	return data_offset;3816}3817 3818int perf_session__inject_header(struct perf_session *session,3819				struct evlist *evlist,3820				int fd,3821				struct feat_copier *fc,3822				bool write_attrs_after_data)3823{3824	return perf_session__do_write_header(session, evlist, fd, true, fc,3825					     write_attrs_after_data);3826}3827 3828static int perf_header__getbuffer64(struct perf_header *header,3829				    int fd, void *buf, size_t size)3830{3831	if (readn(fd, buf, size) <= 0)3832		return -1;3833 3834	if (header->needs_swap)3835		mem_bswap_64(buf, size);3836 3837	return 0;3838}3839 3840int perf_header__process_sections(struct perf_header *header, int fd,3841				  void *data,3842				  int (*process)(struct perf_file_section *section,3843						 struct perf_header *ph,3844						 int feat, int fd, void *data))3845{3846	struct perf_file_section *feat_sec, *sec;3847	int nr_sections;3848	int sec_size;3849	int feat;3850	int err;3851 3852	nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);3853	if (!nr_sections)3854		return 0;3855 3856	feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));3857	if (!feat_sec)3858		return -1;3859 3860	sec_size = sizeof(*feat_sec) * nr_sections;3861 3862	lseek(fd, header->feat_offset, SEEK_SET);3863 3864	err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);3865	if (err < 0)3866		goto out_free;3867 3868	for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {3869		err = process(sec++, header, feat, fd, data);3870		if (err < 0)3871			goto out_free;3872	}3873	err = 0;3874out_free:3875	free(feat_sec);3876	return err;3877}3878 3879static const int attr_file_abi_sizes[] = {3880	[0] = PERF_ATTR_SIZE_VER0,3881	[1] = PERF_ATTR_SIZE_VER1,3882	[2] = PERF_ATTR_SIZE_VER2,3883	[3] = PERF_ATTR_SIZE_VER3,3884	[4] = PERF_ATTR_SIZE_VER4,3885	0,3886};3887 3888/*3889 * In the legacy file format, the magic number is not used to encode endianness.3890 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based3891 * on ABI revisions, we need to try all combinations for all endianness to3892 * detect the endianness.3893 */3894static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)3895{3896	uint64_t ref_size, attr_size;3897	int i;3898 3899	for (i = 0 ; attr_file_abi_sizes[i]; i++) {3900		ref_size = attr_file_abi_sizes[i]3901			 + sizeof(struct perf_file_section);3902		if (hdr_sz != ref_size) {3903			attr_size = bswap_64(hdr_sz);3904			if (attr_size != ref_size)3905				continue;3906 3907			ph->needs_swap = true;3908		}3909		pr_debug("ABI%d perf.data file detected, need_swap=%d\n",3910			 i,3911			 ph->needs_swap);3912		return 0;3913	}3914	/* could not determine endianness */3915	return -1;3916}3917 3918#define PERF_PIPE_HDR_VER0	163919 3920static const size_t attr_pipe_abi_sizes[] = {3921	[0] = PERF_PIPE_HDR_VER0,3922	0,3923};3924 3925/*3926 * In the legacy pipe format, there is an implicit assumption that endianness3927 * between host recording the samples, and host parsing the samples is the3928 * same. This is not always the case given that the pipe output may always be3929 * redirected into a file and analyzed on a different machine with possibly a3930 * different endianness and perf_event ABI revisions in the perf tool itself.3931 */3932static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)3933{3934	u64 attr_size;3935	int i;3936 3937	for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {3938		if (hdr_sz != attr_pipe_abi_sizes[i]) {3939			attr_size = bswap_64(hdr_sz);3940			if (attr_size != hdr_sz)3941				continue;3942 3943			ph->needs_swap = true;3944		}3945		pr_debug("Pipe ABI%d perf.data file detected\n", i);3946		return 0;3947	}3948	return -1;3949}3950 3951bool is_perf_magic(u64 magic)3952{3953	if (!memcmp(&magic, __perf_magic1, sizeof(magic))3954		|| magic == __perf_magic23955		|| magic == __perf_magic2_sw)3956		return true;3957 3958	return false;3959}3960 3961static int check_magic_endian(u64 magic, uint64_t hdr_sz,3962			      bool is_pipe, struct perf_header *ph)3963{3964	int ret;3965 3966	/* check for legacy format */3967	ret = memcmp(&magic, __perf_magic1, sizeof(magic));3968	if (ret == 0) {3969		ph->version = PERF_HEADER_VERSION_1;3970		pr_debug("legacy perf.data format\n");3971		if (is_pipe)3972			return try_all_pipe_abis(hdr_sz, ph);3973 3974		return try_all_file_abis(hdr_sz, ph);3975	}3976	/*3977	 * the new magic number serves two purposes:3978	 * - unique number to identify actual perf.data files3979	 * - encode endianness of file3980	 */3981	ph->version = PERF_HEADER_VERSION_2;3982 3983	/* check magic number with one endianness */3984	if (magic == __perf_magic2)3985		return 0;3986 3987	/* check magic number with opposite endianness */3988	if (magic != __perf_magic2_sw)3989		return -1;3990 3991	ph->needs_swap = true;3992 3993	return 0;3994}3995 3996int perf_file_header__read(struct perf_file_header *header,3997			   struct perf_header *ph, int fd)3998{3999	ssize_t ret;4000 4001	lseek(fd, 0, SEEK_SET);4002 4003	ret = readn(fd, header, sizeof(*header));4004	if (ret <= 0)4005		return -1;4006 4007	if (check_magic_endian(header->magic,4008			       header->attr_size, false, ph) < 0) {4009		pr_debug("magic/endian check failed\n");4010		return -1;4011	}4012 4013	if (ph->needs_swap) {4014		mem_bswap_64(header, offsetof(struct perf_file_header,4015			     adds_features));4016	}4017 4018	if (header->size > header->attrs.offset) {4019		pr_err("Perf file header corrupt: header overlaps attrs\n");4020		return -1;4021	}4022 4023	if (header->size > header->data.offset) {4024		pr_err("Perf file header corrupt: header overlaps data\n");4025		return -1;4026	}4027 4028	if ((header->attrs.offset <= header->data.offset &&4029	     header->attrs.offset + header->attrs.size > header->data.offset) ||4030	    (header->attrs.offset > header->data.offset &&4031	     header->data.offset + header->data.size > header->attrs.offset)) {4032		pr_err("Perf file header corrupt: Attributes and data overlap\n");4033		return -1;4034	}4035 4036	if (header->size != sizeof(*header)) {4037		/* Support the previous format */4038		if (header->size == offsetof(typeof(*header), adds_features))4039			bitmap_zero(header->adds_features, HEADER_FEAT_BITS);4040		else4041			return -1;4042	} else if (ph->needs_swap) {4043		/*4044		 * feature bitmap is declared as an array of unsigned longs --4045		 * not good since its size can differ between the host that4046		 * generated the data file and the host analyzing the file.4047		 *4048		 * We need to handle endianness, but we don't know the size of4049		 * the unsigned long where the file was generated. Take a best4050		 * guess at determining it: try 64-bit swap first (ie., file4051		 * created on a 64-bit host), and check if the hostname feature4052		 * bit is set (this feature bit is forced on as of fbe96f2).4053		 * If the bit is not, undo the 64-bit swap and try a 32-bit4054		 * swap. If the hostname bit is still not set (e.g., older data4055		 * file), punt and fallback to the original behavior --4056		 * clearing all feature bits and setting buildid.4057		 */4058		mem_bswap_64(&header->adds_features,4059			    BITS_TO_U64(HEADER_FEAT_BITS));4060 4061		if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {4062			/* unswap as u64 */4063			mem_bswap_64(&header->adds_features,4064				    BITS_TO_U64(HEADER_FEAT_BITS));4065 4066			/* unswap as u32 */4067			mem_bswap_32(&header->adds_features,4068				    BITS_TO_U32(HEADER_FEAT_BITS));4069		}4070 4071		if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {4072			bitmap_zero(header->adds_features, HEADER_FEAT_BITS);4073			__set_bit(HEADER_BUILD_ID, header->adds_features);4074		}4075	}4076 4077	memcpy(&ph->adds_features, &header->adds_features,4078	       sizeof(ph->adds_features));4079 4080	ph->data_offset  = header->data.offset;4081	ph->data_size	 = header->data.size;4082	ph->feat_offset  = header->data.offset + header->data.size;4083	return 0;4084}4085 4086static int perf_file_section__process(struct perf_file_section *section,4087				      struct perf_header *ph,4088				      int feat, int fd, void *data)4089{4090	struct feat_fd fdd = {4091		.fd	= fd,4092		.ph	= ph,4093		.size	= section->size,4094		.offset	= section->offset,4095	};4096 4097	if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {4098		pr_debug("Failed to lseek to %" PRIu64 " offset for feature "4099			  "%d, continuing...\n", section->offset, feat);4100		return 0;4101	}4102 4103	if (feat >= HEADER_LAST_FEATURE) {4104		pr_debug("unknown feature %d, continuing...\n", feat);4105		return 0;4106	}4107 4108	if (!feat_ops[feat].process)4109		return 0;4110 4111	return feat_ops[feat].process(&fdd, data);4112}4113 4114static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,4115				       struct perf_header *ph,4116				       struct perf_data *data)4117{4118	ssize_t ret;4119 4120	ret = perf_data__read(data, header, sizeof(*header));4121	if (ret <= 0)4122		return -1;4123 4124	if (check_magic_endian(header->magic, header->size, true, ph) < 0) {4125		pr_debug("endian/magic failed\n");4126		return -1;4127	}4128 4129	if (ph->needs_swap)4130		header->size = bswap_64(header->size);4131 4132	return 0;4133}4134 4135static int perf_header__read_pipe(struct perf_session *session)4136{4137	struct perf_header *header = &session->header;4138	struct perf_pipe_file_header f_header;4139 4140	if (perf_file_header__read_pipe(&f_header, header, session->data) < 0) {4141		pr_debug("incompatible file format\n");4142		return -EINVAL;4143	}4144 4145	return f_header.size == sizeof(f_header) ? 0 : -1;4146}4147 4148static int read_attr(int fd, struct perf_header *ph,4149		     struct perf_file_attr *f_attr)4150{4151	struct perf_event_attr *attr = &f_attr->attr;4152	size_t sz, left;4153	size_t our_sz = sizeof(f_attr->attr);4154	ssize_t ret;4155 4156	memset(f_attr, 0, sizeof(*f_attr));4157 4158	/* read minimal guaranteed structure */4159	ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);4160	if (ret <= 0) {4161		pr_debug("cannot read %d bytes of header attr\n",4162			 PERF_ATTR_SIZE_VER0);4163		return -1;4164	}4165 4166	/* on file perf_event_attr size */4167	sz = attr->size;4168 4169	if (ph->needs_swap)4170		sz = bswap_32(sz);4171 4172	if (sz == 0) {4173		/* assume ABI0 */4174		sz =  PERF_ATTR_SIZE_VER0;4175	} else if (sz > our_sz) {4176		pr_debug("file uses a more recent and unsupported ABI"4177			 " (%zu bytes extra)\n", sz - our_sz);4178		return -1;4179	}4180	/* what we have not yet read and that we know about */4181	left = sz - PERF_ATTR_SIZE_VER0;4182	if (left) {4183		void *ptr = attr;4184		ptr += PERF_ATTR_SIZE_VER0;4185 4186		ret = readn(fd, ptr, left);4187	}4188	/* read perf_file_section, ids are read in caller */4189	ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));4190 4191	return ret <= 0 ? -1 : 0;4192}4193 4194#ifdef HAVE_LIBTRACEEVENT4195static int evsel__prepare_tracepoint_event(struct evsel *evsel, struct tep_handle *pevent)4196{4197	struct tep_event *event;4198	char bf[128];4199 4200	/* already prepared */4201	if (evsel->tp_format)4202		return 0;4203 4204	if (pevent == NULL) {4205		pr_debug("broken or missing trace data\n");4206		return -1;4207	}4208 4209	event = tep_find_event(pevent, evsel->core.attr.config);4210	if (event == NULL) {4211		pr_debug("cannot find event format for %d\n", (int)evsel->core.attr.config);4212		return -1;4213	}4214 4215	if (!evsel->name) {4216		snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);4217		evsel->name = strdup(bf);4218		if (evsel->name == NULL)4219			return -1;4220	}4221 4222	evsel->tp_format = event;4223	return 0;4224}4225 4226static int evlist__prepare_tracepoint_events(struct evlist *evlist, struct tep_handle *pevent)4227{4228	struct evsel *pos;4229 4230	evlist__for_each_entry(evlist, pos) {4231		if (pos->core.attr.type == PERF_TYPE_TRACEPOINT &&4232		    evsel__prepare_tracepoint_event(pos, pevent))4233			return -1;4234	}4235 4236	return 0;4237}4238#endif4239 4240int perf_session__read_header(struct perf_session *session)4241{4242	struct perf_data *data = session->data;4243	struct perf_header *header = &session->header;4244	struct perf_file_header	f_header;4245	struct perf_file_attr	f_attr;4246	u64			f_id;4247	int nr_attrs, nr_ids, i, j, err;4248	int fd = perf_data__fd(data);4249 4250	session->evlist = evlist__new();4251	if (session->evlist == NULL)4252		return -ENOMEM;4253 4254	session->evlist->env = &header->env;4255	session->machines.host.env = &header->env;4256 4257	/*4258	 * We can read 'pipe' data event from regular file,4259	 * check for the pipe header regardless of source.4260	 */4261	err = perf_header__read_pipe(session);4262	if (!err || perf_data__is_pipe(data)) {4263		data->is_pipe = true;4264		return err;4265	}4266 4267	if (perf_file_header__read(&f_header, header, fd) < 0)4268		return -EINVAL;4269 4270	if (header->needs_swap && data->in_place_update) {4271		pr_err("In-place update not supported when byte-swapping is required\n");4272		return -EINVAL;4273	}4274 4275	/*4276	 * Sanity check that perf.data was written cleanly; data size is4277	 * initialized to 0 and updated only if the on_exit function is run.4278	 * If data size is still 0 then the file contains only partial4279	 * information.  Just warn user and process it as much as it can.4280	 */4281	if (f_header.data.size == 0) {4282		pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"4283			   "Was the 'perf record' command properly terminated?\n",4284			   data->file.path);4285	}4286 4287	if (f_header.attr_size == 0) {4288		pr_err("ERROR: The %s file's attr size field is 0 which is unexpected.\n"4289		       "Was the 'perf record' command properly terminated?\n",4290		       data->file.path);4291		return -EINVAL;4292	}4293 4294	nr_attrs = f_header.attrs.size / f_header.attr_size;4295	lseek(fd, f_header.attrs.offset, SEEK_SET);4296 4297	for (i = 0; i < nr_attrs; i++) {4298		struct evsel *evsel;4299		off_t tmp;4300 4301		if (read_attr(fd, header, &f_attr) < 0)4302			goto out_errno;4303 4304		if (header->needs_swap) {4305			f_attr.ids.size   = bswap_64(f_attr.ids.size);4306			f_attr.ids.offset = bswap_64(f_attr.ids.offset);4307			perf_event__attr_swap(&f_attr.attr);4308		}4309 4310		tmp = lseek(fd, 0, SEEK_CUR);4311		evsel = evsel__new(&f_attr.attr);4312 4313		if (evsel == NULL)4314			goto out_delete_evlist;4315 4316		evsel->needs_swap = header->needs_swap;4317		/*4318		 * Do it before so that if perf_evsel__alloc_id fails, this4319		 * entry gets purged too at evlist__delete().4320		 */4321		evlist__add(session->evlist, evsel);4322 4323		nr_ids = f_attr.ids.size / sizeof(u64);4324		/*4325		 * We don't have the cpu and thread maps on the header, so4326		 * for allocating the perf_sample_id table we fake 1 cpu and4327		 * hattr->ids threads.4328		 */4329		if (perf_evsel__alloc_id(&evsel->core, 1, nr_ids))4330			goto out_delete_evlist;4331 4332		lseek(fd, f_attr.ids.offset, SEEK_SET);4333 4334		for (j = 0; j < nr_ids; j++) {4335			if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))4336				goto out_errno;4337 4338			perf_evlist__id_add(&session->evlist->core, &evsel->core, 0, j, f_id);4339		}4340 4341		lseek(fd, tmp, SEEK_SET);4342	}4343 4344#ifdef HAVE_LIBTRACEEVENT4345	perf_header__process_sections(header, fd, &session->tevent,4346				      perf_file_section__process);4347 4348	if (evlist__prepare_tracepoint_events(session->evlist, session->tevent.pevent))4349		goto out_delete_evlist;4350#else4351	perf_header__process_sections(header, fd, NULL, perf_file_section__process);4352#endif4353 4354	return 0;4355out_errno:4356	return -errno;4357 4358out_delete_evlist:4359	evlist__delete(session->evlist);4360	session->evlist = NULL;4361	return -ENOMEM;4362}4363 4364int perf_event__process_feature(struct perf_session *session,4365				union perf_event *event)4366{4367	const struct perf_tool *tool = session->tool;4368	struct feat_fd ff = { .fd = 0 };4369	struct perf_record_header_feature *fe = (struct perf_record_header_feature *)event;4370	int type = fe->header.type;4371	u64 feat = fe->feat_id;4372	int ret = 0;4373 4374	if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {4375		pr_warning("invalid record type %d in pipe-mode\n", type);4376		return 0;4377	}4378	if (feat == HEADER_RESERVED || feat >= HEADER_LAST_FEATURE) {4379		pr_warning("invalid record type %d in pipe-mode\n", type);4380		return -1;4381	}4382 4383	if (!feat_ops[feat].process)4384		return 0;4385 4386	ff.buf  = (void *)fe->data;4387	ff.size = event->header.size - sizeof(*fe);4388	ff.ph = &session->header;4389 4390	if (feat_ops[feat].process(&ff, NULL)) {4391		ret = -1;4392		goto out;4393	}4394 4395	if (!feat_ops[feat].print || !tool->show_feat_hdr)4396		goto out;4397 4398	if (!feat_ops[feat].full_only ||4399	    tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {4400		feat_ops[feat].print(&ff, stdout);4401	} else {4402		fprintf(stdout, "# %s info available, use -I to display\n",4403			feat_ops[feat].name);4404	}4405out:4406	free_event_desc(ff.events);4407	return ret;4408}4409 4410size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)4411{4412	struct perf_record_event_update *ev = &event->event_update;4413	struct perf_cpu_map *map;4414	size_t ret;4415 4416	ret = fprintf(fp, "\n... id:    %" PRI_lu64 "\n", ev->id);4417 4418	switch (ev->type) {4419	case PERF_EVENT_UPDATE__SCALE:4420		ret += fprintf(fp, "... scale: %f\n", ev->scale.scale);4421		break;4422	case PERF_EVENT_UPDATE__UNIT:4423		ret += fprintf(fp, "... unit:  %s\n", ev->unit);4424		break;4425	case PERF_EVENT_UPDATE__NAME:4426		ret += fprintf(fp, "... name:  %s\n", ev->name);4427		break;4428	case PERF_EVENT_UPDATE__CPUS:4429		ret += fprintf(fp, "... ");4430 4431		map = cpu_map__new_data(&ev->cpus.cpus);4432		if (map) {4433			ret += cpu_map__fprintf(map, fp);4434			perf_cpu_map__put(map);4435		} else4436			ret += fprintf(fp, "failed to get cpus\n");4437		break;4438	default:4439		ret += fprintf(fp, "... unknown type\n");4440		break;4441	}4442 4443	return ret;4444}4445 4446int perf_event__process_attr(const struct perf_tool *tool __maybe_unused,4447			     union perf_event *event,4448			     struct evlist **pevlist)4449{4450	u32 i, n_ids;4451	u64 *ids;4452	struct evsel *evsel;4453	struct evlist *evlist = *pevlist;4454 4455	if (evlist == NULL) {4456		*pevlist = evlist = evlist__new();4457		if (evlist == NULL)4458			return -ENOMEM;4459	}4460 4461	evsel = evsel__new(&event->attr.attr);4462	if (evsel == NULL)4463		return -ENOMEM;4464 4465	evlist__add(evlist, evsel);4466 4467	n_ids = event->header.size - sizeof(event->header) - event->attr.attr.size;4468	n_ids = n_ids / sizeof(u64);4469	/*4470	 * We don't have the cpu and thread maps on the header, so4471	 * for allocating the perf_sample_id table we fake 1 cpu and4472	 * hattr->ids threads.4473	 */4474	if (perf_evsel__alloc_id(&evsel->core, 1, n_ids))4475		return -ENOMEM;4476 4477	ids = perf_record_header_attr_id(event);4478	for (i = 0; i < n_ids; i++) {4479		perf_evlist__id_add(&evlist->core, &evsel->core, 0, i, ids[i]);4480	}4481 4482	return 0;4483}4484 4485int perf_event__process_event_update(const struct perf_tool *tool __maybe_unused,4486				     union perf_event *event,4487				     struct evlist **pevlist)4488{4489	struct perf_record_event_update *ev = &event->event_update;4490	struct evlist *evlist;4491	struct evsel *evsel;4492	struct perf_cpu_map *map;4493 4494	if (dump_trace)4495		perf_event__fprintf_event_update(event, stdout);4496 4497	if (!pevlist || *pevlist == NULL)4498		return -EINVAL;4499 4500	evlist = *pevlist;4501 4502	evsel = evlist__id2evsel(evlist, ev->id);4503	if (evsel == NULL)4504		return -EINVAL;4505 4506	switch (ev->type) {4507	case PERF_EVENT_UPDATE__UNIT:4508		free((char *)evsel->unit);4509		evsel->unit = strdup(ev->unit);4510		break;4511	case PERF_EVENT_UPDATE__NAME:4512		free(evsel->name);4513		evsel->name = strdup(ev->name);4514		break;4515	case PERF_EVENT_UPDATE__SCALE:4516		evsel->scale = ev->scale.scale;4517		break;4518	case PERF_EVENT_UPDATE__CPUS:4519		map = cpu_map__new_data(&ev->cpus.cpus);4520		if (map) {4521			perf_cpu_map__put(evsel->core.own_cpus);4522			evsel->core.own_cpus = map;4523		} else4524			pr_err("failed to get event_update cpus\n");4525	default:4526		break;4527	}4528 4529	return 0;4530}4531 4532#ifdef HAVE_LIBTRACEEVENT4533int perf_event__process_tracing_data(struct perf_session *session,4534				     union perf_event *event)4535{4536	ssize_t size_read, padding, size = event->tracing_data.size;4537	int fd = perf_data__fd(session->data);4538	char buf[BUFSIZ];4539 4540	/*4541	 * The pipe fd is already in proper place and in any case4542	 * we can't move it, and we'd screw the case where we read4543	 * 'pipe' data from regular file. The trace_report reads4544	 * data from 'fd' so we need to set it directly behind the4545	 * event, where the tracing data starts.4546	 */4547	if (!perf_data__is_pipe(session->data)) {4548		off_t offset = lseek(fd, 0, SEEK_CUR);4549 4550		/* setup for reading amidst mmap */4551		lseek(fd, offset + sizeof(struct perf_record_header_tracing_data),4552		      SEEK_SET);4553	}4554 4555	size_read = trace_report(fd, &session->tevent, session->trace_event_repipe);4556	padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;4557 4558	if (readn(fd, buf, padding) < 0) {4559		pr_err("%s: reading input file", __func__);4560		return -1;4561	}4562	if (session->trace_event_repipe) {4563		int retw = write(STDOUT_FILENO, buf, padding);4564		if (retw <= 0 || retw != padding) {4565			pr_err("%s: repiping tracing data padding", __func__);4566			return -1;4567		}4568	}4569 4570	if (size_read + padding != size) {4571		pr_err("%s: tracing data size mismatch", __func__);4572		return -1;4573	}4574 4575	evlist__prepare_tracepoint_events(session->evlist, session->tevent.pevent);4576 4577	return size_read + padding;4578}4579#endif4580 4581int perf_event__process_build_id(struct perf_session *session,4582				 union perf_event *event)4583{4584	__event_process_build_id(&event->build_id,4585				 event->build_id.filename,4586				 session);4587	return 0;4588}4589