1	// SPDX-License-Identifier: GPL-2.0-only
2
3	#include "util/cgroup.h"
4	#include "util/data.h"
5	#include "util/debug.h"
6	#include "util/dso.h"
7	#include "util/event.h"
8	#include "util/evlist.h"
9	#include "util/machine.h"
10	#include "util/map.h"
11	#include "util/map_symbol.h"
12	#include "util/branch.h"
13	#include "util/memswap.h"
14	#include "util/namespaces.h"
15	#include "util/session.h"
16	#include "util/stat.h"
17	#include "util/symbol.h"
18	#include "util/synthetic-events.h"
19	#include "util/target.h"
20	#include "util/time-utils.h"
21	#include <linux/bitops.h>
22	#include <linux/kernel.h>
23	#include <linux/string.h>
24	#include <linux/zalloc.h>
25	#include <linux/perf_event.h>
26	#include <asm/bug.h>
27	#include <perf/evsel.h>
28	#include <perf/cpumap.h>
29	#include <internal/lib.h> // page_size
30	#include <internal/threadmap.h>
31	#include <perf/threadmap.h>
32	#include <symbol/kallsyms.h>
33	#include <dirent.h>
34	#include <errno.h>
35	#include <inttypes.h>
36	#include <stdio.h>
37	#include <string.h>
38	#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
39	#include <api/fs/fs.h>
40	#include <api/io.h>
41	#include <sys/types.h>
42	#include <sys/stat.h>
43	#include <fcntl.h>
44	#include <unistd.h>
45
46	#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
47
48	unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
49
50	int perf_tool__process_synth_event(struct perf_tool *tool,
51	union perf_event *event,
52	struct machine *machine,
53	perf_event__handler_t process)
54	{
55	struct perf_sample synth_sample = {
56	.pid = -1,
57	.tid = -1,
58	.time = -1,
59	.stream_id = -1,
60	.cpu = -1,
61	.period = 1,
62	.cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
63	};
64
65	return process(tool, event, &synth_sample, machine);
66	};
67
68	/*
69	* Assumes that the first 4095 bytes of /proc/pid/stat contains
70	* the comm, tgid and ppid.
71	*/
72	static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len,
73	pid_t *tgid, pid_t *ppid, bool *kernel)
74	{
75	char bf[4096];
76	int fd;
77	size_t size = 0;
78	ssize_t n;
79	char *name, *tgids, *ppids, *vmpeak, *threads;
80
81	*tgid = -1;
82	*ppid = -1;
83
84	if (pid)
85	snprintf(buf: bf, size: sizeof(bf), fmt: "/proc/%d/task/%d/status", pid, tid);
86	else
87	snprintf(buf: bf, size: sizeof(bf), fmt: "/proc/%d/status", tid);
88
89	fd = open(bf, O_RDONLY);
90	if (fd < 0) {
91	pr_debug("couldn't open %s\n", bf);
92	return -1;
93	}
94
95	n = read(fd, bf, sizeof(bf) - 1);
96	close(fd);
97	if (n <= 0) {
98	pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
99	tid);
100	return -1;
101	}
102	bf[n] = '\0';
103
104	name = strstr(bf, "Name:");
105	tgids = strstr(name ?: bf, "Tgid:");
106	ppids = strstr(tgids ?: bf, "PPid:");
107	vmpeak = strstr(ppids ?: bf, "VmPeak:");
108
109	if (vmpeak)
110	threads = NULL;
111	else
112	threads = strstr(ppids ?: bf, "Threads:");
113
114	if (name) {
115	char *nl;
116
117	name = skip_spaces(name + 5); /* strlen("Name:") */
118	nl = strchr(name, '\n');
119	if (nl)
120	*nl = '\0';
121
122	size = strlen(name);
123	if (size >= len)
124	size = len - 1;
125	memcpy(comm, name, size);
126	comm[size] = '\0';
127	} else {
128	pr_debug("Name: string not found for pid %d\n", tid);
129	}
130
131	if (tgids) {
132	tgids += 5; /* strlen("Tgid:") */
133	*tgid = atoi(tgids);
134	} else {
135	pr_debug("Tgid: string not found for pid %d\n", tid);
136	}
137
138	if (ppids) {
139	ppids += 5; /* strlen("PPid:") */
140	*ppid = atoi(ppids);
141	} else {
142	pr_debug("PPid: string not found for pid %d\n", tid);
143	}
144
145	if (!vmpeak && threads)
146	*kernel = true;
147	else
148	*kernel = false;
149
150	return 0;
151	}
152
153	static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid,
154	struct machine *machine,
155	pid_t *tgid, pid_t *ppid, bool *kernel)
156	{
157	size_t size;
158
159	*ppid = -1;
160
161	memset(&event->comm, 0, sizeof(event->comm));
162
163	if (machine__is_host(machine)) {
164	if (perf_event__get_comm_ids(pid, tid, comm: event->comm.comm,
165	len: sizeof(event->comm.comm),
166	tgid, ppid, kernel) != 0) {
167	return -1;
168	}
169	} else {
170	*tgid = machine->pid;
171	}
172
173	if (*tgid < 0)
174	return -1;
175
176	event->comm.pid = *tgid;
177	event->comm.header.type = PERF_RECORD_COMM;
178
179	size = strlen(event->comm.comm) + 1;
180	size = PERF_ALIGN(size, sizeof(u64));
181	memset(event->comm.comm + size, 0, machine->id_hdr_size);
182	event->comm.header.size = (sizeof(event->comm) -
183	(sizeof(event->comm.comm) - size) +
184	machine->id_hdr_size);
185	event->comm.tid = tid;
186
187	return 0;
188	}
189
190	pid_t perf_event__synthesize_comm(struct perf_tool *tool,
191	union perf_event *event, pid_t pid,
192	perf_event__handler_t process,
193	struct machine *machine)
194	{
195	pid_t tgid, ppid;
196	bool kernel_thread;
197
198	if (perf_event__prepare_comm(event, pid: 0, tid: pid, machine, tgid: &tgid, ppid: &ppid,
199	kernel: &kernel_thread) != 0)
200	return -1;
201
202	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
203	return -1;
204
205	return tgid;
206	}
207
208	static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
209	struct perf_ns_link_info *ns_link_info)
210	{
211	struct stat64 st;
212	char proc_ns[128];
213
214	sprintf(buf: proc_ns, fmt: "/proc/%u/ns/%s", pid, ns);
215	if (stat64(proc_ns, &st) == 0) {
216	ns_link_info->dev = st.st_dev;
217	ns_link_info->ino = st.st_ino;
218	}
219	}
220
221	int perf_event__synthesize_namespaces(struct perf_tool *tool,
222	union perf_event *event,
223	pid_t pid, pid_t tgid,
224	perf_event__handler_t process,
225	struct machine *machine)
226	{
227	u32 idx;
228	struct perf_ns_link_info *ns_link_info;
229
230	if (!tool || !tool->namespace_events)
231	return 0;
232
233	memset(&event->namespaces, 0, (sizeof(event->namespaces) +
234	(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
235	machine->id_hdr_size));
236
237	event->namespaces.pid = tgid;
238	event->namespaces.tid = pid;
239
240	event->namespaces.nr_namespaces = NR_NAMESPACES;
241
242	ns_link_info = event->namespaces.link_info;
243
244	for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
245	perf_event__get_ns_link_info(pid, ns: perf_ns__name(idx),
246	ns_link_info: &ns_link_info[idx]);
247
248	event->namespaces.header.type = PERF_RECORD_NAMESPACES;
249
250	event->namespaces.header.size = (sizeof(event->namespaces) +
251	(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
252	machine->id_hdr_size);
253
254	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
255	return -1;
256
257	return 0;
258	}
259
260	static int perf_event__synthesize_fork(struct perf_tool *tool,
261	union perf_event *event,
262	pid_t pid, pid_t tgid, pid_t ppid,
263	perf_event__handler_t process,
264	struct machine *machine)
265	{
266	memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
267
268	/*
269	* for main thread set parent to ppid from status file. For other
270	* threads set parent pid to main thread. ie., assume main thread
271	* spawns all threads in a process
272	*/
273	if (tgid == pid) {
274	event->fork.ppid = ppid;
275	event->fork.ptid = ppid;
276	} else {
277	event->fork.ppid = tgid;
278	event->fork.ptid = tgid;
279	}
280	event->fork.pid = tgid;
281	event->fork.tid = pid;
282	event->fork.header.type = PERF_RECORD_FORK;
283	event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
284
285	event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
286
287	if (perf_tool__process_synth_event(tool, event, machine, process: process) != 0)
288	return -1;
289
290	return 0;
291	}
292
293	static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
294	u32 *prot, u32 *flags, __u64 *offset,
295	u32 *maj, u32 *min,
296	__u64 *inode,
297	ssize_t pathname_size, char *pathname)
298	{
299	__u64 temp;
300	int ch;
301	char *start_pathname = pathname;
302
303	if (io__get_hex(io, start) != '-')
304	return false;
305	if (io__get_hex(io, end) != ' ')
306	return false;
307
308	/* map protection and flags bits */
309	*prot = 0;
310	ch = io__get_char(io);
311	if (ch == 'r')
312	*prot |= PROT_READ;
313	else if (ch != '-')
314	return false;
315	ch = io__get_char(io);
316	if (ch == 'w')
317	*prot |= PROT_WRITE;
318	else if (ch != '-')
319	return false;
320	ch = io__get_char(io);
321	if (ch == 'x')
322	*prot |= PROT_EXEC;
323	else if (ch != '-')
324	return false;
325	ch = io__get_char(io);
326	if (ch == 's')
327	*flags = MAP_SHARED;
328	else if (ch == 'p')
329	*flags = MAP_PRIVATE;
330	else
331	return false;
332	if (io__get_char(io) != ' ')
333	return false;
334
335	if (io__get_hex(io, offset) != ' ')
336	return false;
337
338	if (io__get_hex(io, &temp) != ':')
339	return false;
340	*maj = temp;
341	if (io__get_hex(io, &temp) != ' ')
342	return false;
343	*min = temp;
344
345	ch = io__get_dec(io, inode);
346	if (ch != ' ') {
347	*pathname = '\0';
348	return ch == '\n';
349	}
350	do {
351	ch = io__get_char(io);
352	} while (ch == ' ');
353	while (true) {
354	if (ch < 0)
355	return false;
356	if (ch == '\0' || ch == '\n' ||
357	(pathname + 1 - start_pathname) >= pathname_size) {
358	*pathname = '\0';
359	return true;
360	}
361	*pathname++ = ch;
362	ch = io__get_char(io);
363	}
364	}
365
366	static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
367	struct machine *machine,
368	bool is_kernel)
369	{
370	struct build_id bid;
371	struct nsinfo *nsi;
372	struct nscookie nc;
373	struct dso *dso = NULL;
374	struct dso_id id;
375	int rc;
376
377	if (is_kernel) {
378	rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
379	goto out;
380	}
381
382	id.maj = event->maj;
383	id.min = event->min;
384	id.ino = event->ino;
385	id.ino_generation = event->ino_generation;
386
387	dso = dsos__findnew_id(&machine->dsos, event->filename, &id);
388	if (dso && dso->has_build_id) {
389	bid = dso->bid;
390	rc = 0;
391	goto out;
392	}
393
394	nsi = nsinfo__new(event->pid);
395	nsinfo__mountns_enter(nsi, &nc);
396
397	rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
398
399	nsinfo__mountns_exit(&nc);
400	nsinfo__put(nsi);
401
402	out:
403	if (rc == 0) {
404	memcpy(event->build_id, bid.data, sizeof(bid.data));
405	event->build_id_size = (u8) bid.size;
406	event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
407	event->__reserved_1 = 0;
408	event->__reserved_2 = 0;
409
410	if (dso && !dso->has_build_id)
411	dso__set_build_id(dso, &bid);
412	} else {
413	if (event->filename[0] == '/') {
414	pr_debug2("Failed to read build ID for %s\n",
415	event->filename);
416	}
417	}
418	dso__put(dso);
419	}
420
421	int perf_event__synthesize_mmap_events(struct perf_tool *tool,
422	union perf_event *event,
423	pid_t pid, pid_t tgid,
424	perf_event__handler_t process,
425	struct machine *machine,
426	bool mmap_data)
427	{
428	unsigned long long t;
429	char bf[BUFSIZ];
430	struct io io;
431	bool truncation = false;
432	unsigned long long timeout = proc_map_timeout * 1000000ULL;
433	int rc = 0;
434	const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
435	int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
436
437	if (machine__is_default_guest(machine))
438	return 0;
439
440	snprintf(buf: bf, size: sizeof(bf), fmt: "%s/proc/%d/task/%d/maps",
441	machine->root_dir, pid, pid);
442
443	io.fd = open(bf, O_RDONLY, 0);
444	if (io.fd < 0) {
445	/*
446	* We raced with a task exiting - just return:
447	*/
448	pr_debug("couldn't open %s\n", bf);
449	return -1;
450	}
451	io__init(&io, io.fd, bf, sizeof(bf));
452
453	event->header.type = PERF_RECORD_MMAP2;
454	t = rdclock();
455
456	while (!io.eof) {
457	static const char anonstr[] = "//anon";
458	size_t size, aligned_size;
459
460	/* ensure null termination since stack will be reused. */
461	event->mmap2.filename[0] = '\0';
462
463	/* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
464	if (!read_proc_maps_line(io: &io,
465	start: &event->mmap2.start,
466	end: &event->mmap2.len,
467	prot: &event->mmap2.prot,
468	flags: &event->mmap2.flags,
469	offset: &event->mmap2.pgoff,
470	maj: &event->mmap2.maj,
471	min: &event->mmap2.min,
472	inode: &event->mmap2.ino,
473	pathname_size: sizeof(event->mmap2.filename),
474	pathname: event->mmap2.filename))
475	continue;
476
477	if ((rdclock() - t) > timeout) {
478	pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
479	"You may want to increase "
480	"the time limit by --proc-map-timeout\n",
481	machine->root_dir, pid, pid);
482	truncation = true;
483	goto out;
484	}
485
486	event->mmap2.ino_generation = 0;
487
488	/*
489	* Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
490	*/
491	if (machine__is_host(machine))
492	event->header.misc = PERF_RECORD_MISC_USER;
493	else
494	event->header.misc = PERF_RECORD_MISC_GUEST_USER;
495
496	if ((event->mmap2.prot & PROT_EXEC) == 0) {
497	if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
498	continue;
499
500	event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
501	}
502
503	out:
504	if (truncation)
505	event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
506
507	if (!strcmp(event->mmap2.filename, ""))
508	strcpy(event->mmap2.filename, anonstr);
509
510	if (hugetlbfs_mnt_len &&
511	!strncmp(event->mmap2.filename, hugetlbfs_mnt,
512	hugetlbfs_mnt_len)) {
513	strcpy(event->mmap2.filename, anonstr);
514	event->mmap2.flags |= MAP_HUGETLB;
515	}
516
517	size = strlen(event->mmap2.filename) + 1;
518	aligned_size = PERF_ALIGN(size, sizeof(u64));
519	event->mmap2.len -= event->mmap.start;
520	event->mmap2.header.size = (sizeof(event->mmap2) -
521	(sizeof(event->mmap2.filename) - aligned_size));
522	memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
523	(aligned_size - size));
524	event->mmap2.header.size += machine->id_hdr_size;
525	event->mmap2.pid = tgid;
526	event->mmap2.tid = pid;
527
528	if (symbol_conf.buildid_mmap2)
529	perf_record_mmap2__read_build_id(event: &event->mmap2, machine, is_kernel: false);
530
531	if (perf_tool__process_synth_event(tool, event, machine, process: process) != 0) {
532	rc = -1;
533	break;
534	}
535
536	if (truncation)
537	break;
538	}
539
540	close(io.fd);
541	return rc;
542	}
543
544	#ifdef HAVE_FILE_HANDLE
545	static int perf_event__synthesize_cgroup(struct perf_tool *tool,
546	union perf_event *event,
547	char *path, size_t mount_len,
548	perf_event__handler_t process,
549	struct machine *machine)
550	{
551	size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
552	size_t path_len = strlen(path) - mount_len + 1;
553	struct {
554	struct file_handle fh;
555	uint64_t cgroup_id;
556	} handle;
557	int mount_id;
558
559	while (path_len % sizeof(u64))
560	path[mount_len + path_len++] = '\0';
561
562	memset(&event->cgroup, 0, event_size);
563
564	event->cgroup.header.type = PERF_RECORD_CGROUP;
565	event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
566
567	handle.fh.handle_bytes = sizeof(handle.cgroup_id);
568	if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
569	pr_debug("stat failed: %s\n", path);
570	return -1;
571	}
572
573	event->cgroup.id = handle.cgroup_id;
574	strncpy(event->cgroup.path, path + mount_len, path_len);
575	memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
576
577	if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
578	pr_debug("process synth event failed\n");
579	return -1;
580	}
581
582	return 0;
583	}
584
585	static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
586	union perf_event *event,
587	char *path, size_t mount_len,
588	perf_event__handler_t process,
589	struct machine *machine)
590	{
591	size_t pos = strlen(path);
592	DIR *d;
593	struct dirent *dent;
594	int ret = 0;
595
596	if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
597	process, machine) < 0)
598	return -1;
599
600	d = opendir(path);
601	if (d == NULL) {
602	pr_debug("failed to open directory: %s\n", path);
603	return -1;
604	}
605
606	while ((dent = readdir(d)) != NULL) {
607	if (dent->d_type != DT_DIR)
608	continue;
609	if (!strcmp(dent->d_name, ".") ||
610	!strcmp(dent->d_name, ".."))
611	continue;
612
613	/* any sane path should be less than PATH_MAX */
614	if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
615	continue;
616
617	if (path[pos - 1] != '/')
618	strcat(path, "/");
619	strcat(path, dent->d_name);
620
621	ret = perf_event__walk_cgroup_tree(tool, event, path,
622	mount_len, process, machine);
623	if (ret < 0)
624	break;
625
626	path[pos] = '\0';
627	}
628
629	closedir(d);
630	return ret;
631	}
632
633	int perf_event__synthesize_cgroups(struct perf_tool *tool,
634	perf_event__handler_t process,
635	struct machine *machine)
636	{
637	union perf_event event;
638	char cgrp_root[PATH_MAX];
639	size_t mount_len; /* length of mount point in the path */
640
641	if (!tool || !tool->cgroup_events)
642	return 0;
643
644	if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
645	pr_debug("cannot find cgroup mount point\n");
646	return -1;
647	}
648
649	mount_len = strlen(cgrp_root);
650	/* make sure the path starts with a slash (after mount point) */
651	strcat(cgrp_root, "/");
652
653	if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
654	process, machine) < 0)
655	return -1;
656
657	return 0;
658	}
659	#else
660	int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
661	perf_event__handler_t process __maybe_unused,
662	struct machine *machine __maybe_unused)
663	{
664	return -1;
665	}
666	#endif
667
668	struct perf_event__synthesize_modules_maps_cb_args {
669	struct perf_tool *tool;
670	perf_event__handler_t process;
671	struct machine *machine;
672	union perf_event *event;
673	};
674
675	static int perf_event__synthesize_modules_maps_cb(struct map *map, void *data)
676	{
677	struct perf_event__synthesize_modules_maps_cb_args *args = data;
678	union perf_event *event = args->event;
679	struct dso *dso;
680	size_t size;
681
682	if (!__map__is_kmodule(map))
683	return 0;
684
685	dso = map__dso(map);
686	if (symbol_conf.buildid_mmap2) {
687	size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64));
688	event->mmap2.header.type = PERF_RECORD_MMAP2;
689	event->mmap2.header.size = (sizeof(event->mmap2) -
690	(sizeof(event->mmap2.filename) - size));
691	memset(event->mmap2.filename + size, 0, args->machine->id_hdr_size);
692	event->mmap2.header.size += args->machine->id_hdr_size;
693	event->mmap2.start = map__start(map);
694	event->mmap2.len = map__size(map);
695	event->mmap2.pid = args->machine->pid;
696
697	memcpy(event->mmap2.filename, dso->long_name, dso->long_name_len + 1);
698
699	perf_record_mmap2__read_build_id(event: &event->mmap2, machine: args->machine, is_kernel: false);
700	} else {
701	size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64));
702	event->mmap.header.type = PERF_RECORD_MMAP;
703	event->mmap.header.size = (sizeof(event->mmap) -
704	(sizeof(event->mmap.filename) - size));
705	memset(event->mmap.filename + size, 0, args->machine->id_hdr_size);
706	event->mmap.header.size += args->machine->id_hdr_size;
707	event->mmap.start = map__start(map);
708	event->mmap.len = map__size(map);
709	event->mmap.pid = args->machine->pid;
710
711	memcpy(event->mmap.filename, dso->long_name, dso->long_name_len + 1);
712	}
713
714	if (perf_tool__process_synth_event(tool: args->tool, event, machine: args->machine, process: args->process) != 0)
715	return -1;
716
717	return 0;
718	}
719
720	int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
721	struct machine *machine)
722	{
723	int rc;
724	struct maps *maps = machine__kernel_maps(machine);
725	struct perf_event__synthesize_modules_maps_cb_args args = {
726	.tool = tool,
727	.process = process,
728	.machine = machine,
729	};
730	size_t size = symbol_conf.buildid_mmap2
731	? sizeof(args.event->mmap2)
732	: sizeof(args.event->mmap);
733
734	args.event = zalloc(size + machine->id_hdr_size);
735	if (args.event == NULL) {
736	pr_debug("Not enough memory synthesizing mmap event "
737	"for kernel modules\n");
738	return -1;
739	}
740
741	/*
742	* kernel uses 0 for user space maps, see kernel/perf_event.c
743	* __perf_event_mmap
744	*/
745	if (machine__is_host(machine))
746	args.event->header.misc = PERF_RECORD_MISC_KERNEL;
747	else
748	args.event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
749
750	rc = maps__for_each_map(maps, perf_event__synthesize_modules_maps_cb, &args);
751
752	free(args.event);
753	return rc;
754	}
755
756	static int filter_task(const struct dirent *dirent)
757	{
758	return isdigit(c: dirent->d_name[0]);
759	}
760
761	static int __event__synthesize_thread(union perf_event *comm_event,
762	union perf_event *mmap_event,
763	union perf_event *fork_event,
764	union perf_event *namespaces_event,
765	pid_t pid, int full, perf_event__handler_t process,
766	struct perf_tool *tool, struct machine *machine,
767	bool needs_mmap, bool mmap_data)
768	{
769	char filename[PATH_MAX];
770	struct dirent **dirent;
771	pid_t tgid, ppid;
772	int rc = 0;
773	int i, n;
774
775	/* special case: only send one comm event using passed in pid */
776	if (!full) {
777	tgid = perf_event__synthesize_comm(tool, event: comm_event, pid,
778	process: process, machine);
779
780	if (tgid == -1)
781	return -1;
782
783	if (perf_event__synthesize_namespaces(tool, event: namespaces_event, pid,
784	tgid, process: process, machine) < 0)
785	return -1;
786
787	/*
788	* send mmap only for thread group leader
789	* see thread__init_maps()
790	*/
791	if (pid == tgid && needs_mmap &&
792	perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
793	process, machine, mmap_data))
794	return -1;
795
796	return 0;
797	}
798
799	if (machine__is_default_guest(machine))
800	return 0;
801
802	snprintf(buf: filename, size: sizeof(filename), fmt: "%s/proc/%d/task",
803	machine->root_dir, pid);
804
805	n = scandir(filename, &dirent, filter_task, NULL);
806	if (n < 0)
807	return n;
808
809	for (i = 0; i < n; i++) {
810	char *end;
811	pid_t _pid;
812	bool kernel_thread = false;
813
814	_pid = strtol(dirent[i]->d_name, &end, 10);
815	if (*end)
816	continue;
817
818	/* some threads may exit just after scan, ignore it */
819	if (perf_event__prepare_comm(event: comm_event, pid, tid: _pid, machine,
820	tgid: &tgid, ppid: &ppid, kernel: &kernel_thread) != 0)
821	continue;
822
823	rc = -1;
824	if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
825	ppid, process, machine) < 0)
826	break;
827
828	if (perf_event__synthesize_namespaces(tool, event: namespaces_event, pid: _pid,
829	tgid, process: process, machine) < 0)
830	break;
831
832	/*
833	* Send the prepared comm event
834	*/
835	if (perf_tool__process_synth_event(tool, event: comm_event, machine, process: process) != 0)
836	break;
837
838	rc = 0;
839	if (_pid == pid && !kernel_thread && needs_mmap) {
840	/* process the parent's maps too */
841	rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
842	process, machine, mmap_data);
843	if (rc)
844	break;
845	}
846	}
847
848	for (i = 0; i < n; i++)
849	zfree(&dirent[i]);
850	free(dirent);
851
852	return rc;
853	}
854
855	int perf_event__synthesize_thread_map(struct perf_tool *tool,
856	struct perf_thread_map *threads,
857	perf_event__handler_t process,
858	struct machine *machine,
859	bool needs_mmap, bool mmap_data)
860	{
861	union perf_event *comm_event, *mmap_event, *fork_event;
862	union perf_event *namespaces_event;
863	int err = -1, thread, j;
864
865	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
866	if (comm_event == NULL)
867	goto out;
868
869	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
870	if (mmap_event == NULL)
871	goto out_free_comm;
872
873	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
874	if (fork_event == NULL)
875	goto out_free_mmap;
876
877	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
878	(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
879	machine->id_hdr_size);
880	if (namespaces_event == NULL)
881	goto out_free_fork;
882
883	err = 0;
884	for (thread = 0; thread < threads->nr; ++thread) {
885	if (__event__synthesize_thread(comm_event, mmap_event,
886	fork_event, namespaces_event,
887	perf_thread_map__pid(threads, thread), 0,
888	process, tool, machine,
889	needs_mmap, mmap_data)) {
890	err = -1;
891	break;
892	}
893
894	/*
895	* comm.pid is set to thread group id by
896	* perf_event__synthesize_comm
897	*/
898	if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
899	bool need_leader = true;
900
901	/* is thread group leader in thread_map? */
902	for (j = 0; j < threads->nr; ++j) {
903	if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
904	need_leader = false;
905	break;
906	}
907	}
908
909	/* if not, generate events for it */
910	if (need_leader &&
911	__event__synthesize_thread(comm_event, mmap_event,
912	fork_event, namespaces_event,
913	comm_event->comm.pid, 0,
914	process, tool, machine,
915	needs_mmap, mmap_data)) {
916	err = -1;
917	break;
918	}
919	}
920	}
921	free(namespaces_event);
922	out_free_fork:
923	free(fork_event);
924	out_free_mmap:
925	free(mmap_event);
926	out_free_comm:
927	free(comm_event);
928	out:
929	return err;
930	}
931
932	static int __perf_event__synthesize_threads(struct perf_tool *tool,
933	perf_event__handler_t process,
934	struct machine *machine,
935	bool needs_mmap,
936	bool mmap_data,
937	struct dirent **dirent,
938	int start,
939	int num)
940	{
941	union perf_event *comm_event, *mmap_event, *fork_event;
942	union perf_event *namespaces_event;
943	int err = -1;
944	char *end;
945	pid_t pid;
946	int i;
947
948	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
949	if (comm_event == NULL)
950	goto out;
951
952	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
953	if (mmap_event == NULL)
954	goto out_free_comm;
955
956	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
957	if (fork_event == NULL)
958	goto out_free_mmap;
959
960	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
961	(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
962	machine->id_hdr_size);
963	if (namespaces_event == NULL)
964	goto out_free_fork;
965
966	for (i = start; i < start + num; i++) {
967	if (!isdigit(c: dirent[i]->d_name[0]))
968	continue;
969
970	pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
971	/* only interested in proper numerical dirents */
972	if (*end)
973	continue;
974	/*
975	* We may race with exiting thread, so don't stop just because
976	* one thread couldn't be synthesized.
977	*/
978	__event__synthesize_thread(comm_event, mmap_event, fork_event,
979	namespaces_event, pid, 1, process,
980	tool, machine, needs_mmap, mmap_data);
981	}
982	err = 0;
983
984	free(namespaces_event);
985	out_free_fork:
986	free(fork_event);
987	out_free_mmap:
988	free(mmap_event);
989	out_free_comm:
990	free(comm_event);
991	out:
992	return err;
993	}
994
995	struct synthesize_threads_arg {
996	struct perf_tool *tool;
997	perf_event__handler_t process;
998	struct machine *machine;
999	bool needs_mmap;
1000	bool mmap_data;
1001	struct dirent **dirent;
1002	int num;
1003	int start;
1004	};
1005
1006	static void *synthesize_threads_worker(void *arg)
1007	{
1008	struct synthesize_threads_arg *args = arg;
1009
1010	__perf_event__synthesize_threads(args->tool, args->process,
1011	args->machine,
1012	args->needs_mmap, args->mmap_data,
1013	args->dirent,
1014	args->start, args->num);
1015	return NULL;
1016	}
1017
1018	int perf_event__synthesize_threads(struct perf_tool *tool,
1019	perf_event__handler_t process,
1020	struct machine *machine,
1021	bool needs_mmap, bool mmap_data,
1022	unsigned int nr_threads_synthesize)
1023	{
1024	struct synthesize_threads_arg *args = NULL;
1025	pthread_t *synthesize_threads = NULL;
1026	char proc_path[PATH_MAX];
1027	struct dirent **dirent;
1028	int num_per_thread;
1029	int m, n, i, j;
1030	int thread_nr;
1031	int base = 0;
1032	int err = -1;
1033
1034
1035	if (machine__is_default_guest(machine))
1036	return 0;
1037
1038	snprintf(buf: proc_path, size: sizeof(proc_path), fmt: "%s/proc", machine->root_dir);
1039	n = scandir(proc_path, &dirent, filter_task, NULL);
1040	if (n < 0)
1041	return err;
1042
1043	if (nr_threads_synthesize == UINT_MAX)
1044	thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1045	else
1046	thread_nr = nr_threads_synthesize;
1047
1048	if (thread_nr <= 1) {
1049	err = __perf_event__synthesize_threads(tool, process,
1050	machine,
1051	needs_mmap, mmap_data,
1052	dirent, base, n);
1053	goto free_dirent;
1054	}
1055	if (thread_nr > n)
1056	thread_nr = n;
1057
1058	synthesize_threads = calloc(thread_nr, sizeof(pthread_t));
1059	if (synthesize_threads == NULL)
1060	goto free_dirent;
1061
1062	args = calloc(thread_nr, sizeof(*args));
1063	if (args == NULL)
1064	goto free_threads;
1065
1066	num_per_thread = n / thread_nr;
1067	m = n % thread_nr;
1068	for (i = 0; i < thread_nr; i++) {
1069	args[i].tool = tool;
1070	args[i].process = process;
1071	args[i].machine = machine;
1072	args[i].needs_mmap = needs_mmap;
1073	args[i].mmap_data = mmap_data;
1074	args[i].dirent = dirent;
1075	}
1076	for (i = 0; i < m; i++) {
1077	args[i].num = num_per_thread + 1;
1078	args[i].start = i * args[i].num;
1079	}
1080	if (i != 0)
1081	base = args[i-1].start + args[i-1].num;
1082	for (j = i; j < thread_nr; j++) {
1083	args[j].num = num_per_thread;
1084	args[j].start = base + (j - i) * args[i].num;
1085	}
1086
1087	for (i = 0; i < thread_nr; i++) {
1088	if (pthread_create(&synthesize_threads[i], NULL,
1089	synthesize_threads_worker, &args[i]))
1090	goto out_join;
1091	}
1092	err = 0;
1093	out_join:
1094	for (i = 0; i < thread_nr; i++)
1095	pthread_join(synthesize_threads[i], NULL);
1096	free(args);
1097	free_threads:
1098	free(synthesize_threads);
1099	free_dirent:
1100	for (i = 0; i < n; i++)
1101	zfree(&dirent[i]);
1102	free(dirent);
1103
1104	return err;
1105	}
1106
1107	int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1108	perf_event__handler_t process __maybe_unused,
1109	struct machine *machine __maybe_unused)
1110	{
1111	return 0;
1112	}
1113
1114	static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1115	perf_event__handler_t process,
1116	struct machine *machine)
1117	{
1118	union perf_event *event;
1119	size_t size = symbol_conf.buildid_mmap2 ?
1120	sizeof(event->mmap2) : sizeof(event->mmap);
1121	struct map *map = machine__kernel_map(machine);
1122	struct kmap *kmap;
1123	int err;
1124
1125	if (map == NULL)
1126	return -1;
1127
1128	kmap = map__kmap(map);
1129	if (!kmap->ref_reloc_sym)
1130	return -1;
1131
1132	/*
1133	* We should get this from /sys/kernel/sections/.text, but till that is
1134	* available use this, and after it is use this as a fallback for older
1135	* kernels.
1136	*/
1137	event = zalloc(size + machine->id_hdr_size);
1138	if (event == NULL) {
1139	pr_debug("Not enough memory synthesizing mmap event "
1140	"for kernel modules\n");
1141	return -1;
1142	}
1143
1144	if (machine__is_host(machine)) {
1145	/*
1146	* kernel uses PERF_RECORD_MISC_USER for user space maps,
1147	* see kernel/perf_event.c __perf_event_mmap
1148	*/
1149	event->header.misc = PERF_RECORD_MISC_KERNEL;
1150	} else {
1151	event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1152	}
1153
1154	if (symbol_conf.buildid_mmap2) {
1155	size = snprintf(buf: event->mmap2.filename, size: sizeof(event->mmap2.filename),
1156	fmt: "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1157	size = PERF_ALIGN(size, sizeof(u64));
1158	event->mmap2.header.type = PERF_RECORD_MMAP2;
1159	event->mmap2.header.size = (sizeof(event->mmap2) -
1160	(sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1161	event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1162	event->mmap2.start = map__start(map);
1163	event->mmap2.len = map__end(map) - event->mmap.start;
1164	event->mmap2.pid = machine->pid;
1165
1166	perf_record_mmap2__read_build_id(event: &event->mmap2, machine, is_kernel: true);
1167	} else {
1168	size = snprintf(buf: event->mmap.filename, size: sizeof(event->mmap.filename),
1169	fmt: "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1170	size = PERF_ALIGN(size, sizeof(u64));
1171	event->mmap.header.type = PERF_RECORD_MMAP;
1172	event->mmap.header.size = (sizeof(event->mmap) -
1173	(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1174	event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1175	event->mmap.start = map__start(map);
1176	event->mmap.len = map__end(map) - event->mmap.start;
1177	event->mmap.pid = machine->pid;
1178	}
1179
1180	err = perf_tool__process_synth_event(tool, event, machine, process: process);
1181	free(event);
1182
1183	return err;
1184	}
1185
1186	int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1187	perf_event__handler_t process,
1188	struct machine *machine)
1189	{
1190	int err;
1191
1192	err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1193	if (err < 0)
1194	return err;
1195
1196	return perf_event__synthesize_extra_kmaps(tool, process, machine);
1197	}
1198
1199	int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1200	struct perf_thread_map *threads,
1201	perf_event__handler_t process,
1202	struct machine *machine)
1203	{
1204	union perf_event *event;
1205	int i, err, size;
1206
1207	size = sizeof(event->thread_map);
1208	size += threads->nr * sizeof(event->thread_map.entries[0]);
1209
1210	event = zalloc(size);
1211	if (!event)
1212	return -ENOMEM;
1213
1214	event->header.type = PERF_RECORD_THREAD_MAP;
1215	event->header.size = size;
1216	event->thread_map.nr = threads->nr;
1217
1218	for (i = 0; i < threads->nr; i++) {
1219	struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1220	char *comm = perf_thread_map__comm(threads, i);
1221
1222	if (!comm)
1223	comm = (char *) "";
1224
1225	entry->pid = perf_thread_map__pid(threads, i);
1226	strncpy(p: (char *) &entry->comm, q: comm, size: sizeof(entry->comm));
1227	}
1228
1229	err = process(tool, event, NULL, machine);
1230
1231	free(event);
1232	return err;
1233	}
1234
1235	struct synthesize_cpu_map_data {
1236	const struct perf_cpu_map *map;
1237	int nr;
1238	int min_cpu;
1239	int max_cpu;
1240	int has_any_cpu;
1241	int type;
1242	size_t size;
1243	struct perf_record_cpu_map_data *data;
1244	};
1245
1246	static void synthesize_cpus(struct synthesize_cpu_map_data *data)
1247	{
1248	data->data->type = PERF_CPU_MAP__CPUS;
1249	data->data->cpus_data.nr = data->nr;
1250	for (int i = 0; i < data->nr; i++)
1251	data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
1252	}
1253
1254	static void synthesize_mask(struct synthesize_cpu_map_data *data)
1255	{
1256	int idx;
1257	struct perf_cpu cpu;
1258
1259	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1260	data->data->type = PERF_CPU_MAP__MASK;
1261	data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
1262	data->data->mask32_data.long_size = 4;
1263
1264	perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
1265	int bit_word = cpu.cpu / 32;
1266	u32 bit_mask = 1U << (cpu.cpu & 31);
1267
1268	data->data->mask32_data.mask[bit_word] |= bit_mask;
1269	}
1270	}
1271
1272	static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
1273	{
1274	data->data->type = PERF_CPU_MAP__RANGE_CPUS;
1275	data->data->range_cpu_data.any_cpu = data->has_any_cpu;
1276	data->data->range_cpu_data.start_cpu = data->min_cpu;
1277	data->data->range_cpu_data.end_cpu = data->max_cpu;
1278	}
1279
1280	static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
1281	size_t header_size)
1282	{
1283	size_t size_cpus, size_mask;
1284
1285	syn_data->nr = perf_cpu_map__nr(syn_data->map);
1286	syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
1287
1288	syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
1289	syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
1290	if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
1291	/* A consecutive range of CPUs can be encoded using a range. */
1292	assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
1293	syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
1294	syn_data->size = header_size + sizeof(u64);
1295	return zalloc(syn_data->size);
1296	}
1297
1298	size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
1299	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1300	size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
1301	BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
1302	if (syn_data->has_any_cpu || size_cpus < size_mask) {
1303	/* Follow the CPU map encoding. */
1304	syn_data->type = PERF_CPU_MAP__CPUS;
1305	syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
1306	return zalloc(syn_data->size);
1307	}
1308	/* Encode using a bitmask. */
1309	syn_data->type = PERF_CPU_MAP__MASK;
1310	syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
1311	return zalloc(syn_data->size);
1312	}
1313
1314	static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
1315	{
1316	switch (data->type) {
1317	case PERF_CPU_MAP__CPUS:
1318	synthesize_cpus(data);
1319	break;
1320	case PERF_CPU_MAP__MASK:
1321	synthesize_mask(data);
1322	break;
1323	case PERF_CPU_MAP__RANGE_CPUS:
1324	synthesize_range_cpus(data);
1325	break;
1326	default:
1327	break;
1328	}
1329	}
1330
1331	static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1332	{
1333	struct synthesize_cpu_map_data syn_data = { .map = map };
1334	struct perf_record_cpu_map *event;
1335
1336
1337	event = cpu_map_data__alloc(syn_data: &syn_data, header_size: sizeof(struct perf_event_header));
1338	if (!event)
1339	return NULL;
1340
1341	syn_data.data = &event->data;
1342	event->header.type = PERF_RECORD_CPU_MAP;
1343	event->header.size = syn_data.size;
1344	cpu_map_data__synthesize(data: &syn_data);
1345	return event;
1346	}
1347
1348
1349	int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1350	const struct perf_cpu_map *map,
1351	perf_event__handler_t process,
1352	struct machine *machine)
1353	{
1354	struct perf_record_cpu_map *event;
1355	int err;
1356
1357	event = cpu_map_event__new(map);
1358	if (!event)
1359	return -ENOMEM;
1360
1361	err = process(tool, (union perf_event *) event, NULL, machine);
1362
1363	free(event);
1364	return err;
1365	}
1366
1367	int perf_event__synthesize_stat_config(struct perf_tool *tool,
1368	struct perf_stat_config *config,
1369	perf_event__handler_t process,
1370	struct machine *machine)
1371	{
1372	struct perf_record_stat_config *event;
1373	int size, i = 0, err;
1374
1375	size = sizeof(*event);
1376	size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1377
1378	event = zalloc(size);
1379	if (!event)
1380	return -ENOMEM;
1381
1382	event->header.type = PERF_RECORD_STAT_CONFIG;
1383	event->header.size = size;
1384	event->nr = PERF_STAT_CONFIG_TERM__MAX;
1385
1386	#define ADD(__term, __val) \
1387	event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \
1388	event->data[i].val = __val; \
1389	i++;
1390
1391	ADD(AGGR_MODE, config->aggr_mode)
1392	ADD(INTERVAL, config->interval)
1393	ADD(SCALE, config->scale)
1394	ADD(AGGR_LEVEL, config->aggr_level)
1395
1396	WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1397	"stat config terms unbalanced\n");
1398	#undef ADD
1399
1400	err = process(tool, (union perf_event *) event, NULL, machine);
1401
1402	free(event);
1403	return err;
1404	}
1405
1406	int perf_event__synthesize_stat(struct perf_tool *tool,
1407	struct perf_cpu cpu, u32 thread, u64 id,
1408	struct perf_counts_values *count,
1409	perf_event__handler_t process,
1410	struct machine *machine)
1411	{
1412	struct perf_record_stat event;
1413
1414	event.header.type = PERF_RECORD_STAT;
1415	event.header.size = sizeof(event);
1416	event.header.misc = 0;
1417
1418	event.id = id;
1419	event.cpu = cpu.cpu;
1420	event.thread = thread;
1421	event.val = count->val;
1422	event.ena = count->ena;
1423	event.run = count->run;
1424
1425	return process(tool, (union perf_event *) &event, NULL, machine);
1426	}
1427
1428	int perf_event__synthesize_stat_round(struct perf_tool *tool,
1429	u64 evtime, u64 type,
1430	perf_event__handler_t process,
1431	struct machine *machine)
1432	{
1433	struct perf_record_stat_round event;
1434
1435	event.header.type = PERF_RECORD_STAT_ROUND;
1436	event.header.size = sizeof(event);
1437	event.header.misc = 0;
1438
1439	event.time = evtime;
1440	event.type = type;
1441
1442	return process(tool, (union perf_event *) &event, NULL, machine);
1443	}
1444
1445	size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1446	{
1447	size_t sz, result = sizeof(struct perf_record_sample);
1448
1449	if (type & PERF_SAMPLE_IDENTIFIER)
1450	result += sizeof(u64);
1451
1452	if (type & PERF_SAMPLE_IP)
1453	result += sizeof(u64);
1454
1455	if (type & PERF_SAMPLE_TID)
1456	result += sizeof(u64);
1457
1458	if (type & PERF_SAMPLE_TIME)
1459	result += sizeof(u64);
1460
1461	if (type & PERF_SAMPLE_ADDR)
1462	result += sizeof(u64);
1463
1464	if (type & PERF_SAMPLE_ID)
1465	result += sizeof(u64);
1466
1467	if (type & PERF_SAMPLE_STREAM_ID)
1468	result += sizeof(u64);
1469
1470	if (type & PERF_SAMPLE_CPU)
1471	result += sizeof(u64);
1472
1473	if (type & PERF_SAMPLE_PERIOD)
1474	result += sizeof(u64);
1475
1476	if (type & PERF_SAMPLE_READ) {
1477	result += sizeof(u64);
1478	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1479	result += sizeof(u64);
1480	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1481	result += sizeof(u64);
1482	/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1483	if (read_format & PERF_FORMAT_GROUP) {
1484	sz = sample_read_value_size(read_format);
1485	result += sz * sample->read.group.nr;
1486	} else {
1487	result += sizeof(u64);
1488	if (read_format & PERF_FORMAT_LOST)
1489	result += sizeof(u64);
1490	}
1491	}
1492
1493	if (type & PERF_SAMPLE_CALLCHAIN) {
1494	sz = (sample->callchain->nr + 1) * sizeof(u64);
1495	result += sz;
1496	}
1497
1498	if (type & PERF_SAMPLE_RAW) {
1499	result += sizeof(u32);
1500	result += sample->raw_size;
1501	}
1502
1503	if (type & PERF_SAMPLE_BRANCH_STACK) {
1504	sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1505	/* nr, hw_idx */
1506	sz += 2 * sizeof(u64);
1507	result += sz;
1508	}
1509
1510	if (type & PERF_SAMPLE_REGS_USER) {
1511	if (sample->user_regs.abi) {
1512	result += sizeof(u64);
1513	sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1514	result += sz;
1515	} else {
1516	result += sizeof(u64);
1517	}
1518	}
1519
1520	if (type & PERF_SAMPLE_STACK_USER) {
1521	sz = sample->user_stack.size;
1522	result += sizeof(u64);
1523	if (sz) {
1524	result += sz;
1525	result += sizeof(u64);
1526	}
1527	}
1528
1529	if (type & PERF_SAMPLE_WEIGHT_TYPE)
1530	result += sizeof(u64);
1531
1532	if (type & PERF_SAMPLE_DATA_SRC)
1533	result += sizeof(u64);
1534
1535	if (type & PERF_SAMPLE_TRANSACTION)
1536	result += sizeof(u64);
1537
1538	if (type & PERF_SAMPLE_REGS_INTR) {
1539	if (sample->intr_regs.abi) {
1540	result += sizeof(u64);
1541	sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1542	result += sz;
1543	} else {
1544	result += sizeof(u64);
1545	}
1546	}
1547
1548	if (type & PERF_SAMPLE_PHYS_ADDR)
1549	result += sizeof(u64);
1550
1551	if (type & PERF_SAMPLE_CGROUP)
1552	result += sizeof(u64);
1553
1554	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1555	result += sizeof(u64);
1556
1557	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1558	result += sizeof(u64);
1559
1560	if (type & PERF_SAMPLE_AUX) {
1561	result += sizeof(u64);
1562	result += sample->aux_sample.size;
1563	}
1564
1565	return result;
1566	}
1567
1568	void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1569	__u64 *array, u64 type __maybe_unused)
1570	{
1571	*array = data->weight;
1572	}
1573
1574	static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1575	const struct perf_sample *sample)
1576	{
1577	size_t sz = sample_read_value_size(read_format);
1578	struct sample_read_value *v = sample->read.group.values;
1579
1580	sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1581	/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1582	memcpy(array, v, sz);
1583	array = (void *)array + sz;
1584	}
1585	return array;
1586	}
1587
1588	int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1589	const struct perf_sample *sample)
1590	{
1591	__u64 *array;
1592	size_t sz;
1593	/*
1594	* used for cross-endian analysis. See git commit 65014ab3
1595	* for why this goofiness is needed.
1596	*/
1597	union u64_swap u;
1598
1599	array = event->sample.array;
1600
1601	if (type & PERF_SAMPLE_IDENTIFIER) {
1602	*array = sample->id;
1603	array++;
1604	}
1605
1606	if (type & PERF_SAMPLE_IP) {
1607	*array = sample->ip;
1608	array++;
1609	}
1610
1611	if (type & PERF_SAMPLE_TID) {
1612	u.val32[0] = sample->pid;
1613	u.val32[1] = sample->tid;
1614	*array = u.val64;
1615	array++;
1616	}
1617
1618	if (type & PERF_SAMPLE_TIME) {
1619	*array = sample->time;
1620	array++;
1621	}
1622
1623	if (type & PERF_SAMPLE_ADDR) {
1624	*array = sample->addr;
1625	array++;
1626	}
1627
1628	if (type & PERF_SAMPLE_ID) {
1629	*array = sample->id;
1630	array++;
1631	}
1632
1633	if (type & PERF_SAMPLE_STREAM_ID) {
1634	*array = sample->stream_id;
1635	array++;
1636	}
1637
1638	if (type & PERF_SAMPLE_CPU) {
1639	u.val32[0] = sample->cpu;
1640	u.val32[1] = 0;
1641	*array = u.val64;
1642	array++;
1643	}
1644
1645	if (type & PERF_SAMPLE_PERIOD) {
1646	*array = sample->period;
1647	array++;
1648	}
1649
1650	if (type & PERF_SAMPLE_READ) {
1651	if (read_format & PERF_FORMAT_GROUP)
1652	*array = sample->read.group.nr;
1653	else
1654	*array = sample->read.one.value;
1655	array++;
1656
1657	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1658	*array = sample->read.time_enabled;
1659	array++;
1660	}
1661
1662	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1663	*array = sample->read.time_running;
1664	array++;
1665	}
1666
1667	/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1668	if (read_format & PERF_FORMAT_GROUP) {
1669	array = copy_read_group_values(array, read_format,
1670	sample);
1671	} else {
1672	*array = sample->read.one.id;
1673	array++;
1674
1675	if (read_format & PERF_FORMAT_LOST) {
1676	*array = sample->read.one.lost;
1677	array++;
1678	}
1679	}
1680	}
1681
1682	if (type & PERF_SAMPLE_CALLCHAIN) {
1683	sz = (sample->callchain->nr + 1) * sizeof(u64);
1684	memcpy(array, sample->callchain, sz);
1685	array = (void *)array + sz;
1686	}
1687
1688	if (type & PERF_SAMPLE_RAW) {
1689	u.val32[0] = sample->raw_size;
1690	*array = u.val64;
1691	array = (void *)array + sizeof(u32);
1692
1693	memcpy(array, sample->raw_data, sample->raw_size);
1694	array = (void *)array + sample->raw_size;
1695	}
1696
1697	if (type & PERF_SAMPLE_BRANCH_STACK) {
1698	sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1699	/* nr, hw_idx */
1700	sz += 2 * sizeof(u64);
1701	memcpy(array, sample->branch_stack, sz);
1702	array = (void *)array + sz;
1703	}
1704
1705	if (type & PERF_SAMPLE_REGS_USER) {
1706	if (sample->user_regs.abi) {
1707	*array++ = sample->user_regs.abi;
1708	sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1709	memcpy(array, sample->user_regs.regs, sz);
1710	array = (void *)array + sz;
1711	} else {
1712	*array++ = 0;
1713	}
1714	}
1715
1716	if (type & PERF_SAMPLE_STACK_USER) {
1717	sz = sample->user_stack.size;
1718	*array++ = sz;
1719	if (sz) {
1720	memcpy(array, sample->user_stack.data, sz);
1721	array = (void *)array + sz;
1722	*array++ = sz;
1723	}
1724	}
1725
1726	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1727	arch_perf_synthesize_sample_weight(data: sample, array, type);
1728	array++;
1729	}
1730
1731	if (type & PERF_SAMPLE_DATA_SRC) {
1732	*array = sample->data_src;
1733	array++;
1734	}
1735
1736	if (type & PERF_SAMPLE_TRANSACTION) {
1737	*array = sample->transaction;
1738	array++;
1739	}
1740
1741	if (type & PERF_SAMPLE_REGS_INTR) {
1742	if (sample->intr_regs.abi) {
1743	*array++ = sample->intr_regs.abi;
1744	sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1745	memcpy(array, sample->intr_regs.regs, sz);
1746	array = (void *)array + sz;
1747	} else {
1748	*array++ = 0;
1749	}
1750	}
1751
1752	if (type & PERF_SAMPLE_PHYS_ADDR) {
1753	*array = sample->phys_addr;
1754	array++;
1755	}
1756
1757	if (type & PERF_SAMPLE_CGROUP) {
1758	*array = sample->cgroup;
1759	array++;
1760	}
1761
1762	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1763	*array = sample->data_page_size;
1764	array++;
1765	}
1766
1767	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1768	*array = sample->code_page_size;
1769	array++;
1770	}
1771
1772	if (type & PERF_SAMPLE_AUX) {
1773	sz = sample->aux_sample.size;
1774	*array++ = sz;
1775	memcpy(array, sample->aux_sample.data, sz);
1776	array = (void *)array + sz;
1777	}
1778
1779	return 0;
1780	}
1781
1782	int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1783	{
1784	__u64 *start = array;
1785
1786	/*
1787	* used for cross-endian analysis. See git commit 65014ab3
1788	* for why this goofiness is needed.
1789	*/
1790	union u64_swap u;
1791
1792	if (type & PERF_SAMPLE_TID) {
1793	u.val32[0] = sample->pid;
1794	u.val32[1] = sample->tid;
1795	*array = u.val64;
1796	array++;
1797	}
1798
1799	if (type & PERF_SAMPLE_TIME) {
1800	*array = sample->time;
1801	array++;
1802	}
1803
1804	if (type & PERF_SAMPLE_ID) {
1805	*array = sample->id;
1806	array++;
1807	}
1808
1809	if (type & PERF_SAMPLE_STREAM_ID) {
1810	*array = sample->stream_id;
1811	array++;
1812	}
1813
1814	if (type & PERF_SAMPLE_CPU) {
1815	u.val32[0] = sample->cpu;
1816	u.val32[1] = 0;
1817	*array = u.val64;
1818	array++;
1819	}
1820
1821	if (type & PERF_SAMPLE_IDENTIFIER) {
1822	*array = sample->id;
1823	array++;
1824	}
1825
1826	return (void *)array - (void *)start;
1827	}
1828
1829	int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1830	struct evlist *evlist, struct machine *machine, size_t from)
1831	{
1832	union perf_event *ev;
1833	struct evsel *evsel;
1834	size_t nr = 0, i = 0, sz, max_nr, n, pos;
1835	size_t e1_sz = sizeof(struct id_index_entry);
1836	size_t e2_sz = sizeof(struct id_index_entry_2);
1837	size_t etot_sz = e1_sz + e2_sz;
1838	bool e2_needed = false;
1839	int err;
1840
1841	max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1842
1843	pos = 0;
1844	evlist__for_each_entry(evlist, evsel) {
1845	if (pos++ < from)
1846	continue;
1847	nr += evsel->core.ids;
1848	}
1849
1850	if (!nr)
1851	return 0;
1852
1853	pr_debug2("Synthesizing id index\n");
1854
1855	n = nr > max_nr ? max_nr : nr;
1856	sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1857	ev = zalloc(sz);
1858	if (!ev)
1859	return -ENOMEM;
1860
1861	sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1862
1863	ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1864	ev->id_index.nr = n;
1865
1866	pos = 0;
1867	evlist__for_each_entry(evlist, evsel) {
1868	u32 j;
1869
1870	if (pos++ < from)
1871	continue;
1872	for (j = 0; j < evsel->core.ids; j++, i++) {
1873	struct id_index_entry *e;
1874	struct id_index_entry_2 *e2;
1875	struct perf_sample_id *sid;
1876
1877	if (i >= n) {
1878	ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1879	err = process(tool, ev, NULL, machine);
1880	if (err)
1881	goto out_err;
1882	nr -= n;
1883	i = 0;
1884	e2_needed = false;
1885	}
1886
1887	e = &ev->id_index.entries[i];
1888
1889	e->id = evsel->core.id[j];
1890
1891	sid = evlist__id2sid(evlist, e->id);
1892	if (!sid) {
1893	free(ev);
1894	return -ENOENT;
1895	}
1896
1897	e->idx = sid->idx;
1898	e->cpu = sid->cpu.cpu;
1899	e->tid = sid->tid;
1900
1901	if (sid->machine_pid)
1902	e2_needed = true;
1903
1904	e2 = (void *)ev + sz;
1905	e2[i].machine_pid = sid->machine_pid;
1906	e2[i].vcpu = sid->vcpu.cpu;
1907	}
1908	}
1909
1910	sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1911	ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1912	ev->id_index.nr = nr;
1913
1914	err = process(tool, ev, NULL, machine);
1915	out_err:
1916	free(ev);
1917
1918	return err;
1919	}
1920
1921	int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1922	struct evlist *evlist, struct machine *machine)
1923	{
1924	return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1925	}
1926
1927	int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1928	struct target *target, struct perf_thread_map *threads,
1929	perf_event__handler_t process, bool needs_mmap,
1930	bool data_mmap, unsigned int nr_threads_synthesize)
1931	{
1932	/*
1933	* When perf runs in non-root PID namespace, and the namespace's proc FS
1934	* is not mounted, nsinfo__is_in_root_namespace() returns false.
1935	* In this case, the proc FS is coming for the parent namespace, thus
1936	* perf tool will wrongly gather process info from its parent PID
1937	* namespace.
1938	*
1939	* To avoid the confusion that the perf tool runs in a child PID
1940	* namespace but it synthesizes thread info from its parent PID
1941	* namespace, returns failure with warning.
1942	*/
1943	if (!nsinfo__is_in_root_namespace()) {
1944	pr_err("Perf runs in non-root PID namespace but it tries to ");
1945	pr_err("gather process info from its parent PID namespace.\n");
1946	pr_err("Please mount the proc file system properly, e.g. ");
1947	pr_err("add the option '--mount-proc' for unshare command.\n");
1948	return -EPERM;
1949	}
1950
1951	if (target__has_task(target))
1952	return perf_event__synthesize_thread_map(tool, threads, process, machine,
1953	needs_mmap, data_mmap);
1954	else if (target__has_cpu(target))
1955	return perf_event__synthesize_threads(tool, process, machine,
1956	needs_mmap, data_mmap,
1957	nr_threads_synthesize);
1958	/* command specified */
1959	return 0;
1960	}
1961
1962	int machine__synthesize_threads(struct machine *machine, struct target *target,
1963	struct perf_thread_map *threads, bool needs_mmap,
1964	bool data_mmap, unsigned int nr_threads_synthesize)
1965	{
1966	return __machine__synthesize_threads(machine, NULL, target, threads,
1967	perf_event__process, needs_mmap,
1968	data_mmap, nr_threads_synthesize);
1969	}
1970
1971	static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1972	{
1973	struct perf_record_event_update *ev;
1974
1975	size += sizeof(*ev);
1976	size = PERF_ALIGN(size, sizeof(u64));
1977
1978	ev = zalloc(size);
1979	if (ev) {
1980	ev->header.type = PERF_RECORD_EVENT_UPDATE;
1981	ev->header.size = (u16)size;
1982	ev->type = type;
1983	ev->id = id;
1984	}
1985	return ev;
1986	}
1987
1988	int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1989	perf_event__handler_t process)
1990	{
1991	size_t size = strlen(evsel->unit);
1992	struct perf_record_event_update *ev;
1993	int err;
1994
1995	ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1996	if (ev == NULL)
1997	return -ENOMEM;
1998
1999	strlcpy(ev->unit, evsel->unit, size + 1);
2000	err = process(tool, (union perf_event *)ev, NULL, NULL);
2001	free(ev);
2002	return err;
2003	}
2004
2005	int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
2006	perf_event__handler_t process)
2007	{
2008	struct perf_record_event_update *ev;
2009	struct perf_record_event_update_scale *ev_data;
2010	int err;
2011
2012	ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
2013	if (ev == NULL)
2014	return -ENOMEM;
2015
2016	ev->scale.scale = evsel->scale;
2017	err = process(tool, (union perf_event *)ev, NULL, NULL);
2018	free(ev);
2019	return err;
2020	}
2021
2022	int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
2023	perf_event__handler_t process)
2024	{
2025	struct perf_record_event_update *ev;
2026	size_t len = strlen(evsel__name(evsel));
2027	int err;
2028
2029	ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
2030	if (ev == NULL)
2031	return -ENOMEM;
2032
2033	strlcpy(ev->name, evsel->name, len + 1);
2034	err = process(tool, (union perf_event *)ev, NULL, NULL);
2035	free(ev);
2036	return err;
2037	}
2038
2039	int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
2040	perf_event__handler_t process)
2041	{
2042	struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
2043	struct perf_record_event_update *ev;
2044	int err;
2045
2046	ev = cpu_map_data__alloc(syn_data: &syn_data, header_size: sizeof(struct perf_event_header) + 2 * sizeof(u64));
2047	if (!ev)
2048	return -ENOMEM;
2049
2050	syn_data.data = &ev->cpus.cpus;
2051	ev->header.type = PERF_RECORD_EVENT_UPDATE;
2052	ev->header.size = (u16)syn_data.size;
2053	ev->type = PERF_EVENT_UPDATE__CPUS;
2054	ev->id = evsel->core.id[0];
2055	cpu_map_data__synthesize(data: &syn_data);
2056
2057	err = process(tool, (union perf_event *)ev, NULL, NULL);
2058	free(ev);
2059	return err;
2060	}
2061
2062	int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
2063	perf_event__handler_t process)
2064	{
2065	struct evsel *evsel;
2066	int err = 0;
2067
2068	evlist__for_each_entry(evlist, evsel) {
2069	err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2070	evsel->core.id, process);
2071	if (err) {
2072	pr_debug("failed to create perf header attribute\n");
2073	return err;
2074	}
2075	}
2076
2077	return err;
2078	}
2079
2080	static bool has_unit(struct evsel *evsel)
2081	{
2082	return evsel->unit && *evsel->unit;
2083	}
2084
2085	static bool has_scale(struct evsel *evsel)
2086	{
2087	return evsel->scale != 1;
2088	}
2089
2090	int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
2091	perf_event__handler_t process, bool is_pipe)
2092	{
2093	struct evsel *evsel;
2094	int err;
2095
2096	/*
2097	* Synthesize other events stuff not carried within
2098	* attr event - unit, scale, name
2099	*/
2100	evlist__for_each_entry(evsel_list, evsel) {
2101	if (!evsel->supported)
2102	continue;
2103
2104	/*
2105	* Synthesize unit and scale only if it's defined.
2106	*/
2107	if (has_unit(evsel)) {
2108	err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2109	if (err < 0) {
2110	pr_err("Couldn't synthesize evsel unit.\n");
2111	return err;
2112	}
2113	}
2114
2115	if (has_scale(evsel)) {
2116	err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2117	if (err < 0) {
2118	pr_err("Couldn't synthesize evsel evsel.\n");
2119	return err;
2120	}
2121	}
2122
2123	if (evsel->core.own_cpus) {
2124	err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2125	if (err < 0) {
2126	pr_err("Couldn't synthesize evsel cpus.\n");
2127	return err;
2128	}
2129	}
2130
2131	/*
2132	* Name is needed only for pipe output,
2133	* perf.data carries event names.
2134	*/
2135	if (is_pipe) {
2136	err = perf_event__synthesize_event_update_name(tool, evsel, process);
2137	if (err < 0) {
2138	pr_err("Couldn't synthesize evsel name.\n");
2139	return err;
2140	}
2141	}
2142	}
2143	return 0;
2144	}
2145
2146	int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2147	u32 ids, u64 *id, perf_event__handler_t process)
2148	{
2149	union perf_event *ev;
2150	size_t size;
2151	int err;
2152
2153	size = sizeof(struct perf_event_attr);
2154	size = PERF_ALIGN(size, sizeof(u64));
2155	size += sizeof(struct perf_event_header);
2156	size += ids * sizeof(u64);
2157
2158	ev = zalloc(size);
2159
2160	if (ev == NULL)
2161	return -ENOMEM;
2162
2163	ev->attr.attr = *attr;
2164	memcpy(perf_record_header_attr_id(ev), id, ids * sizeof(u64));
2165
2166	ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2167	ev->attr.header.size = (u16)size;
2168
2169	if (ev->attr.header.size == size)
2170	err = process(tool, ev, NULL, NULL);
2171	else
2172	err = -E2BIG;
2173
2174	free(ev);
2175
2176	return err;
2177	}
2178
2179	#ifdef HAVE_LIBTRACEEVENT
2180	int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2181	perf_event__handler_t process)
2182	{
2183	union perf_event ev;
2184	struct tracing_data *tdata;
2185	ssize_t size = 0, aligned_size = 0, padding;
2186	struct feat_fd ff;
2187
2188	/*
2189	* We are going to store the size of the data followed
2190	* by the data contents. Since the fd descriptor is a pipe,
2191	* we cannot seek back to store the size of the data once
2192	* we know it. Instead we:
2193	*
2194	* - write the tracing data to the temp file
2195	* - get/write the data size to pipe
2196	* - write the tracing data from the temp file
2197	* to the pipe
2198	*/
2199	tdata = tracing_data_get(&evlist->core.entries, fd, true);
2200	if (!tdata)
2201	return -1;
2202
2203	memset(&ev, 0, sizeof(ev));
2204
2205	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2206	size = tdata->size;
2207	aligned_size = PERF_ALIGN(size, sizeof(u64));
2208	padding = aligned_size - size;
2209	ev.tracing_data.header.size = sizeof(ev.tracing_data);
2210	ev.tracing_data.size = aligned_size;
2211
2212	process(tool, &ev, NULL, NULL);
2213
2214	/*
2215	* The put function will copy all the tracing data
2216	* stored in temp file to the pipe.
2217	*/
2218	tracing_data_put(tdata);
2219
2220	ff = (struct feat_fd){ .fd = fd };
2221	if (write_padded(&ff, NULL, 0, padding))
2222	return -1;
2223
2224	return aligned_size;
2225	}
2226	#endif
2227
2228	int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2229	perf_event__handler_t process, struct machine *machine)
2230	{
2231	union perf_event ev;
2232	size_t len;
2233
2234	if (!pos->hit)
2235	return 0;
2236
2237	memset(&ev, 0, sizeof(ev));
2238
2239	len = pos->long_name_len + 1;
2240	len = PERF_ALIGN(len, NAME_ALIGN);
2241	ev.build_id.size = min(pos->bid.size, sizeof(pos->bid.data));
2242	memcpy(&ev.build_id.build_id, pos->bid.data, ev.build_id.size);
2243	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2244	ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
2245	ev.build_id.pid = machine->pid;
2246	ev.build_id.header.size = sizeof(ev.build_id) + len;
2247	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2248
2249	return process(tool, &ev, NULL, machine);
2250	}
2251
2252	int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2253	struct evlist *evlist, perf_event__handler_t process, bool attrs)
2254	{
2255	int err;
2256
2257	if (attrs) {
2258	err = perf_event__synthesize_attrs(tool, evlist, process);
2259	if (err < 0) {
2260	pr_err("Couldn't synthesize attrs.\n");
2261	return err;
2262	}
2263	}
2264
2265	err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2266	err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2267	if (err < 0) {
2268	pr_err("Couldn't synthesize thread map.\n");
2269	return err;
2270	}
2271
2272	err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2273	if (err < 0) {
2274	pr_err("Couldn't synthesize thread map.\n");
2275	return err;
2276	}
2277
2278	err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2279	if (err < 0) {
2280	pr_err("Couldn't synthesize config.\n");
2281	return err;
2282	}
2283
2284	return 0;
2285	}
2286
2287	extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2288
2289	int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2290	struct evlist *evlist, perf_event__handler_t process)
2291	{
2292	struct perf_header *header = &session->header;
2293	struct perf_record_header_feature *fe;
2294	struct feat_fd ff;
2295	size_t sz, sz_hdr;
2296	int feat, ret;
2297
2298	sz_hdr = sizeof(fe->header);
2299	sz = sizeof(union perf_event);
2300	/* get a nice alignment */
2301	sz = PERF_ALIGN(sz, page_size);
2302
2303	memset(&ff, 0, sizeof(ff));
2304
2305	ff.buf = malloc(sz);
2306	if (!ff.buf)
2307	return -ENOMEM;
2308
2309	ff.size = sz - sz_hdr;
2310	ff.ph = &session->header;
2311
2312	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2313	if (!feat_ops[feat].synthesize) {
2314	pr_debug("No record header feature for header :%d\n", feat);
2315	continue;
2316	}
2317
2318	ff.offset = sizeof(*fe);
2319
2320	ret = feat_ops[feat].write(&ff, evlist);
2321	if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2322	pr_debug("Error writing feature\n");
2323	continue;
2324	}
2325	/* ff.buf may have changed due to realloc in do_write() */
2326	fe = ff.buf;
2327	memset(fe, 0, sizeof(*fe));
2328
2329	fe->feat_id = feat;
2330	fe->header.type = PERF_RECORD_HEADER_FEATURE;
2331	fe->header.size = ff.offset;
2332
2333	ret = process(tool, ff.buf, NULL, NULL);
2334	if (ret) {
2335	free(ff.buf);
2336	return ret;
2337	}
2338	}
2339
2340	/* Send HEADER_LAST_FEATURE mark. */
2341	fe = ff.buf;
2342	fe->feat_id = HEADER_LAST_FEATURE;
2343	fe->header.type = PERF_RECORD_HEADER_FEATURE;
2344	fe->header.size = sizeof(*fe);
2345
2346	ret = process(tool, ff.buf, NULL, NULL);
2347
2348	free(ff.buf);
2349	return ret;
2350	}
2351
2352	int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2353	struct perf_session *session,
2354	struct perf_data *data,
2355	perf_event__handler_t process)
2356	{
2357	int err;
2358	int ret = 0;
2359	struct evlist *evlist = session->evlist;
2360
2361	/*
2362	* We need to synthesize events first, because some
2363	* features works on top of them (on report side).
2364	*/
2365	err = perf_event__synthesize_attrs(tool, evlist, process);
2366	if (err < 0) {
2367	pr_err("Couldn't synthesize attrs.\n");
2368	return err;
2369	}
2370	ret += err;
2371
2372	err = perf_event__synthesize_features(tool, session, evlist, process);
2373	if (err < 0) {
2374	pr_err("Couldn't synthesize features.\n");
2375	return err;
2376	}
2377	ret += err;
2378
2379	#ifdef HAVE_LIBTRACEEVENT
2380	if (have_tracepoints(&evlist->core.entries)) {
2381	int fd = perf_data__fd(data);
2382
2383	/*
2384	* FIXME err <= 0 here actually means that
2385	* there were no tracepoints so its not really
2386	* an error, just that we don't need to
2387	* synthesize anything. We really have to
2388	* return this more properly and also
2389	* propagate errors that now are calling die()
2390	*/
2391	err = perf_event__synthesize_tracing_data(tool, fd, evlist,
2392	process);
2393	if (err <= 0) {
2394	pr_err("Couldn't record tracing data.\n");
2395	return err;
2396	}
2397	ret += err;
2398	}
2399	#else
2400	(void)data;
2401	#endif
2402
2403	return ret;
2404	}
2405
2406	int parse_synth_opt(char *synth)
2407	{
2408	char *p, *q;
2409	int ret = 0;
2410
2411	if (synth == NULL)
2412	return -1;
2413
2414	for (q = synth; (p = strsep(&q, ",")); p = q) {
2415	if (!strcasecmp(s1: p, s2: "no") || !strcasecmp(s1: p, s2: "none"))
2416	return 0;
2417
2418	if (!strcasecmp(p, "all"))
2419	return PERF_SYNTH_ALL;
2420
2421	if (!strcasecmp(s1: p, s2: "task"))
2422	ret |= PERF_SYNTH_TASK;
2423	else if (!strcasecmp(s1: p, s2: "mmap"))
2424	ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2425	else if (!strcasecmp(s1: p, s2: "cgroup"))
2426	ret |= PERF_SYNTH_CGROUP;
2427	else
2428	return -1;
2429	}
2430
2431	return ret;
2432	}
2433