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(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid);
86 	else
87 		snprintf(bf, sizeof(bf), "/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, event->comm.comm,
165 					     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, 0, pid, machine, &tgid, &ppid,
199 				     &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(proc_ns, "/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, perf_ns__name(idx),
246 					     &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) != 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(bf, sizeof(bf), "%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,
465 					&event->mmap2.start,
466 					&event->mmap2.len,
467 					&event->mmap2.prot,
468 					&event->mmap2.flags,
469 					&event->mmap2.pgoff,
470 					&event->mmap2.maj,
471 					&event->mmap2.min,
472 					&event->mmap2.ino,
473 					sizeof(event->mmap2.filename),
474 					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->mmap2, machine, false);
530 
531 		if (perf_tool__process_synth_event(tool, event, machine, 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 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
669 				   struct machine *machine)
670 {
671 	int rc = 0;
672 	struct map_rb_node *pos;
673 	struct maps *maps = machine__kernel_maps(machine);
674 	union perf_event *event;
675 	size_t size = symbol_conf.buildid_mmap2 ?
676 			sizeof(event->mmap2) : sizeof(event->mmap);
677 
678 	event = zalloc(size + machine->id_hdr_size);
679 	if (event == NULL) {
680 		pr_debug("Not enough memory synthesizing mmap event "
681 			 "for kernel modules\n");
682 		return -1;
683 	}
684 
685 	/*
686 	 * kernel uses 0 for user space maps, see kernel/perf_event.c
687 	 * __perf_event_mmap
688 	 */
689 	if (machine__is_host(machine))
690 		event->header.misc = PERF_RECORD_MISC_KERNEL;
691 	else
692 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
693 
694 	maps__for_each_entry(maps, pos) {
695 		struct map *map = pos->map;
696 		struct dso *dso;
697 
698 		if (!__map__is_kmodule(map))
699 			continue;
700 
701 		dso = map__dso(map);
702 		if (symbol_conf.buildid_mmap2) {
703 			size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64));
704 			event->mmap2.header.type = PERF_RECORD_MMAP2;
705 			event->mmap2.header.size = (sizeof(event->mmap2) -
706 						(sizeof(event->mmap2.filename) - size));
707 			memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
708 			event->mmap2.header.size += machine->id_hdr_size;
709 			event->mmap2.start = map__start(map);
710 			event->mmap2.len   = map__size(map);
711 			event->mmap2.pid   = machine->pid;
712 
713 			memcpy(event->mmap2.filename, dso->long_name, dso->long_name_len + 1);
714 
715 			perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
716 		} else {
717 			size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64));
718 			event->mmap.header.type = PERF_RECORD_MMAP;
719 			event->mmap.header.size = (sizeof(event->mmap) -
720 						(sizeof(event->mmap.filename) - size));
721 			memset(event->mmap.filename + size, 0, machine->id_hdr_size);
722 			event->mmap.header.size += machine->id_hdr_size;
723 			event->mmap.start = map__start(map);
724 			event->mmap.len   = map__size(map);
725 			event->mmap.pid   = machine->pid;
726 
727 			memcpy(event->mmap.filename, dso->long_name, dso->long_name_len + 1);
728 		}
729 
730 		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
731 			rc = -1;
732 			break;
733 		}
734 	}
735 
736 	free(event);
737 	return rc;
738 }
739 
740 static int filter_task(const struct dirent *dirent)
741 {
742 	return isdigit(dirent->d_name[0]);
743 }
744 
745 static int __event__synthesize_thread(union perf_event *comm_event,
746 				      union perf_event *mmap_event,
747 				      union perf_event *fork_event,
748 				      union perf_event *namespaces_event,
749 				      pid_t pid, int full, perf_event__handler_t process,
750 				      struct perf_tool *tool, struct machine *machine,
751 				      bool needs_mmap, bool mmap_data)
752 {
753 	char filename[PATH_MAX];
754 	struct dirent **dirent;
755 	pid_t tgid, ppid;
756 	int rc = 0;
757 	int i, n;
758 
759 	/* special case: only send one comm event using passed in pid */
760 	if (!full) {
761 		tgid = perf_event__synthesize_comm(tool, comm_event, pid,
762 						   process, machine);
763 
764 		if (tgid == -1)
765 			return -1;
766 
767 		if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
768 						      tgid, process, machine) < 0)
769 			return -1;
770 
771 		/*
772 		 * send mmap only for thread group leader
773 		 * see thread__init_maps()
774 		 */
775 		if (pid == tgid && needs_mmap &&
776 		    perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
777 						       process, machine, mmap_data))
778 			return -1;
779 
780 		return 0;
781 	}
782 
783 	if (machine__is_default_guest(machine))
784 		return 0;
785 
786 	snprintf(filename, sizeof(filename), "%s/proc/%d/task",
787 		 machine->root_dir, pid);
788 
789 	n = scandir(filename, &dirent, filter_task, NULL);
790 	if (n < 0)
791 		return n;
792 
793 	for (i = 0; i < n; i++) {
794 		char *end;
795 		pid_t _pid;
796 		bool kernel_thread = false;
797 
798 		_pid = strtol(dirent[i]->d_name, &end, 10);
799 		if (*end)
800 			continue;
801 
802 		/* some threads may exit just after scan, ignore it */
803 		if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
804 					     &tgid, &ppid, &kernel_thread) != 0)
805 			continue;
806 
807 		rc = -1;
808 		if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
809 						ppid, process, machine) < 0)
810 			break;
811 
812 		if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
813 						      tgid, process, machine) < 0)
814 			break;
815 
816 		/*
817 		 * Send the prepared comm event
818 		 */
819 		if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
820 			break;
821 
822 		rc = 0;
823 		if (_pid == pid && !kernel_thread && needs_mmap) {
824 			/* process the parent's maps too */
825 			rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
826 						process, machine, mmap_data);
827 			if (rc)
828 				break;
829 		}
830 	}
831 
832 	for (i = 0; i < n; i++)
833 		zfree(&dirent[i]);
834 	free(dirent);
835 
836 	return rc;
837 }
838 
839 int perf_event__synthesize_thread_map(struct perf_tool *tool,
840 				      struct perf_thread_map *threads,
841 				      perf_event__handler_t process,
842 				      struct machine *machine,
843 				      bool needs_mmap, bool mmap_data)
844 {
845 	union perf_event *comm_event, *mmap_event, *fork_event;
846 	union perf_event *namespaces_event;
847 	int err = -1, thread, j;
848 
849 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
850 	if (comm_event == NULL)
851 		goto out;
852 
853 	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
854 	if (mmap_event == NULL)
855 		goto out_free_comm;
856 
857 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
858 	if (fork_event == NULL)
859 		goto out_free_mmap;
860 
861 	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
862 				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
863 				  machine->id_hdr_size);
864 	if (namespaces_event == NULL)
865 		goto out_free_fork;
866 
867 	err = 0;
868 	for (thread = 0; thread < threads->nr; ++thread) {
869 		if (__event__synthesize_thread(comm_event, mmap_event,
870 					       fork_event, namespaces_event,
871 					       perf_thread_map__pid(threads, thread), 0,
872 					       process, tool, machine,
873 					       needs_mmap, mmap_data)) {
874 			err = -1;
875 			break;
876 		}
877 
878 		/*
879 		 * comm.pid is set to thread group id by
880 		 * perf_event__synthesize_comm
881 		 */
882 		if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
883 			bool need_leader = true;
884 
885 			/* is thread group leader in thread_map? */
886 			for (j = 0; j < threads->nr; ++j) {
887 				if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
888 					need_leader = false;
889 					break;
890 				}
891 			}
892 
893 			/* if not, generate events for it */
894 			if (need_leader &&
895 			    __event__synthesize_thread(comm_event, mmap_event,
896 						       fork_event, namespaces_event,
897 						       comm_event->comm.pid, 0,
898 						       process, tool, machine,
899 						       needs_mmap, mmap_data)) {
900 				err = -1;
901 				break;
902 			}
903 		}
904 	}
905 	free(namespaces_event);
906 out_free_fork:
907 	free(fork_event);
908 out_free_mmap:
909 	free(mmap_event);
910 out_free_comm:
911 	free(comm_event);
912 out:
913 	return err;
914 }
915 
916 static int __perf_event__synthesize_threads(struct perf_tool *tool,
917 					    perf_event__handler_t process,
918 					    struct machine *machine,
919 					    bool needs_mmap,
920 					    bool mmap_data,
921 					    struct dirent **dirent,
922 					    int start,
923 					    int num)
924 {
925 	union perf_event *comm_event, *mmap_event, *fork_event;
926 	union perf_event *namespaces_event;
927 	int err = -1;
928 	char *end;
929 	pid_t pid;
930 	int i;
931 
932 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
933 	if (comm_event == NULL)
934 		goto out;
935 
936 	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
937 	if (mmap_event == NULL)
938 		goto out_free_comm;
939 
940 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
941 	if (fork_event == NULL)
942 		goto out_free_mmap;
943 
944 	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
945 				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
946 				  machine->id_hdr_size);
947 	if (namespaces_event == NULL)
948 		goto out_free_fork;
949 
950 	for (i = start; i < start + num; i++) {
951 		if (!isdigit(dirent[i]->d_name[0]))
952 			continue;
953 
954 		pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
955 		/* only interested in proper numerical dirents */
956 		if (*end)
957 			continue;
958 		/*
959 		 * We may race with exiting thread, so don't stop just because
960 		 * one thread couldn't be synthesized.
961 		 */
962 		__event__synthesize_thread(comm_event, mmap_event, fork_event,
963 					   namespaces_event, pid, 1, process,
964 					   tool, machine, needs_mmap, mmap_data);
965 	}
966 	err = 0;
967 
968 	free(namespaces_event);
969 out_free_fork:
970 	free(fork_event);
971 out_free_mmap:
972 	free(mmap_event);
973 out_free_comm:
974 	free(comm_event);
975 out:
976 	return err;
977 }
978 
979 struct synthesize_threads_arg {
980 	struct perf_tool *tool;
981 	perf_event__handler_t process;
982 	struct machine *machine;
983 	bool needs_mmap;
984 	bool mmap_data;
985 	struct dirent **dirent;
986 	int num;
987 	int start;
988 };
989 
990 static void *synthesize_threads_worker(void *arg)
991 {
992 	struct synthesize_threads_arg *args = arg;
993 
994 	__perf_event__synthesize_threads(args->tool, args->process,
995 					 args->machine,
996 					 args->needs_mmap, args->mmap_data,
997 					 args->dirent,
998 					 args->start, args->num);
999 	return NULL;
1000 }
1001 
1002 int perf_event__synthesize_threads(struct perf_tool *tool,
1003 				   perf_event__handler_t process,
1004 				   struct machine *machine,
1005 				   bool needs_mmap, bool mmap_data,
1006 				   unsigned int nr_threads_synthesize)
1007 {
1008 	struct synthesize_threads_arg *args = NULL;
1009 	pthread_t *synthesize_threads = NULL;
1010 	char proc_path[PATH_MAX];
1011 	struct dirent **dirent;
1012 	int num_per_thread;
1013 	int m, n, i, j;
1014 	int thread_nr;
1015 	int base = 0;
1016 	int err = -1;
1017 
1018 
1019 	if (machine__is_default_guest(machine))
1020 		return 0;
1021 
1022 	snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
1023 	n = scandir(proc_path, &dirent, filter_task, NULL);
1024 	if (n < 0)
1025 		return err;
1026 
1027 	if (nr_threads_synthesize == UINT_MAX)
1028 		thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1029 	else
1030 		thread_nr = nr_threads_synthesize;
1031 
1032 	if (thread_nr <= 1) {
1033 		err = __perf_event__synthesize_threads(tool, process,
1034 						       machine,
1035 						       needs_mmap, mmap_data,
1036 						       dirent, base, n);
1037 		goto free_dirent;
1038 	}
1039 	if (thread_nr > n)
1040 		thread_nr = n;
1041 
1042 	synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
1043 	if (synthesize_threads == NULL)
1044 		goto free_dirent;
1045 
1046 	args = calloc(sizeof(*args), thread_nr);
1047 	if (args == NULL)
1048 		goto free_threads;
1049 
1050 	num_per_thread = n / thread_nr;
1051 	m = n % thread_nr;
1052 	for (i = 0; i < thread_nr; i++) {
1053 		args[i].tool = tool;
1054 		args[i].process = process;
1055 		args[i].machine = machine;
1056 		args[i].needs_mmap = needs_mmap;
1057 		args[i].mmap_data = mmap_data;
1058 		args[i].dirent = dirent;
1059 	}
1060 	for (i = 0; i < m; i++) {
1061 		args[i].num = num_per_thread + 1;
1062 		args[i].start = i * args[i].num;
1063 	}
1064 	if (i != 0)
1065 		base = args[i-1].start + args[i-1].num;
1066 	for (j = i; j < thread_nr; j++) {
1067 		args[j].num = num_per_thread;
1068 		args[j].start = base + (j - i) * args[i].num;
1069 	}
1070 
1071 	for (i = 0; i < thread_nr; i++) {
1072 		if (pthread_create(&synthesize_threads[i], NULL,
1073 				   synthesize_threads_worker, &args[i]))
1074 			goto out_join;
1075 	}
1076 	err = 0;
1077 out_join:
1078 	for (i = 0; i < thread_nr; i++)
1079 		pthread_join(synthesize_threads[i], NULL);
1080 	free(args);
1081 free_threads:
1082 	free(synthesize_threads);
1083 free_dirent:
1084 	for (i = 0; i < n; i++)
1085 		zfree(&dirent[i]);
1086 	free(dirent);
1087 
1088 	return err;
1089 }
1090 
1091 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1092 					      perf_event__handler_t process __maybe_unused,
1093 					      struct machine *machine __maybe_unused)
1094 {
1095 	return 0;
1096 }
1097 
1098 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1099 						perf_event__handler_t process,
1100 						struct machine *machine)
1101 {
1102 	union perf_event *event;
1103 	size_t size = symbol_conf.buildid_mmap2 ?
1104 			sizeof(event->mmap2) : sizeof(event->mmap);
1105 	struct map *map = machine__kernel_map(machine);
1106 	struct kmap *kmap;
1107 	int err;
1108 
1109 	if (map == NULL)
1110 		return -1;
1111 
1112 	kmap = map__kmap(map);
1113 	if (!kmap->ref_reloc_sym)
1114 		return -1;
1115 
1116 	/*
1117 	 * We should get this from /sys/kernel/sections/.text, but till that is
1118 	 * available use this, and after it is use this as a fallback for older
1119 	 * kernels.
1120 	 */
1121 	event = zalloc(size + machine->id_hdr_size);
1122 	if (event == NULL) {
1123 		pr_debug("Not enough memory synthesizing mmap event "
1124 			 "for kernel modules\n");
1125 		return -1;
1126 	}
1127 
1128 	if (machine__is_host(machine)) {
1129 		/*
1130 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
1131 		 * see kernel/perf_event.c __perf_event_mmap
1132 		 */
1133 		event->header.misc = PERF_RECORD_MISC_KERNEL;
1134 	} else {
1135 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1136 	}
1137 
1138 	if (symbol_conf.buildid_mmap2) {
1139 		size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1140 				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1141 		size = PERF_ALIGN(size, sizeof(u64));
1142 		event->mmap2.header.type = PERF_RECORD_MMAP2;
1143 		event->mmap2.header.size = (sizeof(event->mmap2) -
1144 				(sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1145 		event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1146 		event->mmap2.start = map__start(map);
1147 		event->mmap2.len   = map__end(map) - event->mmap.start;
1148 		event->mmap2.pid   = machine->pid;
1149 
1150 		perf_record_mmap2__read_build_id(&event->mmap2, machine, true);
1151 	} else {
1152 		size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1153 				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1154 		size = PERF_ALIGN(size, sizeof(u64));
1155 		event->mmap.header.type = PERF_RECORD_MMAP;
1156 		event->mmap.header.size = (sizeof(event->mmap) -
1157 				(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1158 		event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1159 		event->mmap.start = map__start(map);
1160 		event->mmap.len   = map__end(map) - event->mmap.start;
1161 		event->mmap.pid   = machine->pid;
1162 	}
1163 
1164 	err = perf_tool__process_synth_event(tool, event, machine, process);
1165 	free(event);
1166 
1167 	return err;
1168 }
1169 
1170 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1171 				       perf_event__handler_t process,
1172 				       struct machine *machine)
1173 {
1174 	int err;
1175 
1176 	err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1177 	if (err < 0)
1178 		return err;
1179 
1180 	return perf_event__synthesize_extra_kmaps(tool, process, machine);
1181 }
1182 
1183 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1184 				      struct perf_thread_map *threads,
1185 				      perf_event__handler_t process,
1186 				      struct machine *machine)
1187 {
1188 	union perf_event *event;
1189 	int i, err, size;
1190 
1191 	size  = sizeof(event->thread_map);
1192 	size +=	threads->nr * sizeof(event->thread_map.entries[0]);
1193 
1194 	event = zalloc(size);
1195 	if (!event)
1196 		return -ENOMEM;
1197 
1198 	event->header.type = PERF_RECORD_THREAD_MAP;
1199 	event->header.size = size;
1200 	event->thread_map.nr = threads->nr;
1201 
1202 	for (i = 0; i < threads->nr; i++) {
1203 		struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1204 		char *comm = perf_thread_map__comm(threads, i);
1205 
1206 		if (!comm)
1207 			comm = (char *) "";
1208 
1209 		entry->pid = perf_thread_map__pid(threads, i);
1210 		strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1211 	}
1212 
1213 	err = process(tool, event, NULL, machine);
1214 
1215 	free(event);
1216 	return err;
1217 }
1218 
1219 struct synthesize_cpu_map_data {
1220 	const struct perf_cpu_map *map;
1221 	int nr;
1222 	int min_cpu;
1223 	int max_cpu;
1224 	int has_any_cpu;
1225 	int type;
1226 	size_t size;
1227 	struct perf_record_cpu_map_data *data;
1228 };
1229 
1230 static void synthesize_cpus(struct synthesize_cpu_map_data *data)
1231 {
1232 	data->data->type = PERF_CPU_MAP__CPUS;
1233 	data->data->cpus_data.nr = data->nr;
1234 	for (int i = 0; i < data->nr; i++)
1235 		data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
1236 }
1237 
1238 static void synthesize_mask(struct synthesize_cpu_map_data *data)
1239 {
1240 	int idx;
1241 	struct perf_cpu cpu;
1242 
1243 	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1244 	data->data->type = PERF_CPU_MAP__MASK;
1245 	data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
1246 	data->data->mask32_data.long_size = 4;
1247 
1248 	perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
1249 		int bit_word = cpu.cpu / 32;
1250 		u32 bit_mask = 1U << (cpu.cpu & 31);
1251 
1252 		data->data->mask32_data.mask[bit_word] |= bit_mask;
1253 	}
1254 }
1255 
1256 static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
1257 {
1258 	data->data->type = PERF_CPU_MAP__RANGE_CPUS;
1259 	data->data->range_cpu_data.any_cpu = data->has_any_cpu;
1260 	data->data->range_cpu_data.start_cpu = data->min_cpu;
1261 	data->data->range_cpu_data.end_cpu = data->max_cpu;
1262 }
1263 
1264 static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
1265 				 size_t header_size)
1266 {
1267 	size_t size_cpus, size_mask;
1268 
1269 	syn_data->nr = perf_cpu_map__nr(syn_data->map);
1270 	syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
1271 
1272 	syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
1273 	syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
1274 	if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
1275 		/* A consecutive range of CPUs can be encoded using a range. */
1276 		assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
1277 		syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
1278 		syn_data->size = header_size + sizeof(u64);
1279 		return zalloc(syn_data->size);
1280 	}
1281 
1282 	size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
1283 	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1284 	size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
1285 		BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
1286 	if (syn_data->has_any_cpu || size_cpus < size_mask) {
1287 		/* Follow the CPU map encoding. */
1288 		syn_data->type = PERF_CPU_MAP__CPUS;
1289 		syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
1290 		return zalloc(syn_data->size);
1291 	}
1292 	/* Encode using a bitmask. */
1293 	syn_data->type = PERF_CPU_MAP__MASK;
1294 	syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
1295 	return zalloc(syn_data->size);
1296 }
1297 
1298 static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
1299 {
1300 	switch (data->type) {
1301 	case PERF_CPU_MAP__CPUS:
1302 		synthesize_cpus(data);
1303 		break;
1304 	case PERF_CPU_MAP__MASK:
1305 		synthesize_mask(data);
1306 		break;
1307 	case PERF_CPU_MAP__RANGE_CPUS:
1308 		synthesize_range_cpus(data);
1309 		break;
1310 	default:
1311 		break;
1312 	}
1313 }
1314 
1315 static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1316 {
1317 	struct synthesize_cpu_map_data syn_data = { .map = map };
1318 	struct perf_record_cpu_map *event;
1319 
1320 
1321 	event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header));
1322 	if (!event)
1323 		return NULL;
1324 
1325 	syn_data.data = &event->data;
1326 	event->header.type = PERF_RECORD_CPU_MAP;
1327 	event->header.size = syn_data.size;
1328 	cpu_map_data__synthesize(&syn_data);
1329 	return event;
1330 }
1331 
1332 
1333 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1334 				   const struct perf_cpu_map *map,
1335 				   perf_event__handler_t process,
1336 				   struct machine *machine)
1337 {
1338 	struct perf_record_cpu_map *event;
1339 	int err;
1340 
1341 	event = cpu_map_event__new(map);
1342 	if (!event)
1343 		return -ENOMEM;
1344 
1345 	err = process(tool, (union perf_event *) event, NULL, machine);
1346 
1347 	free(event);
1348 	return err;
1349 }
1350 
1351 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1352 				       struct perf_stat_config *config,
1353 				       perf_event__handler_t process,
1354 				       struct machine *machine)
1355 {
1356 	struct perf_record_stat_config *event;
1357 	int size, i = 0, err;
1358 
1359 	size  = sizeof(*event);
1360 	size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1361 
1362 	event = zalloc(size);
1363 	if (!event)
1364 		return -ENOMEM;
1365 
1366 	event->header.type = PERF_RECORD_STAT_CONFIG;
1367 	event->header.size = size;
1368 	event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1369 
1370 #define ADD(__term, __val)					\
1371 	event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;	\
1372 	event->data[i].val = __val;				\
1373 	i++;
1374 
1375 	ADD(AGGR_MODE,	config->aggr_mode)
1376 	ADD(INTERVAL,	config->interval)
1377 	ADD(SCALE,	config->scale)
1378 	ADD(AGGR_LEVEL,	config->aggr_level)
1379 
1380 	WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1381 		  "stat config terms unbalanced\n");
1382 #undef ADD
1383 
1384 	err = process(tool, (union perf_event *) event, NULL, machine);
1385 
1386 	free(event);
1387 	return err;
1388 }
1389 
1390 int perf_event__synthesize_stat(struct perf_tool *tool,
1391 				struct perf_cpu cpu, u32 thread, u64 id,
1392 				struct perf_counts_values *count,
1393 				perf_event__handler_t process,
1394 				struct machine *machine)
1395 {
1396 	struct perf_record_stat event;
1397 
1398 	event.header.type = PERF_RECORD_STAT;
1399 	event.header.size = sizeof(event);
1400 	event.header.misc = 0;
1401 
1402 	event.id        = id;
1403 	event.cpu       = cpu.cpu;
1404 	event.thread    = thread;
1405 	event.val       = count->val;
1406 	event.ena       = count->ena;
1407 	event.run       = count->run;
1408 
1409 	return process(tool, (union perf_event *) &event, NULL, machine);
1410 }
1411 
1412 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1413 				      u64 evtime, u64 type,
1414 				      perf_event__handler_t process,
1415 				      struct machine *machine)
1416 {
1417 	struct perf_record_stat_round event;
1418 
1419 	event.header.type = PERF_RECORD_STAT_ROUND;
1420 	event.header.size = sizeof(event);
1421 	event.header.misc = 0;
1422 
1423 	event.time = evtime;
1424 	event.type = type;
1425 
1426 	return process(tool, (union perf_event *) &event, NULL, machine);
1427 }
1428 
1429 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1430 {
1431 	size_t sz, result = sizeof(struct perf_record_sample);
1432 
1433 	if (type & PERF_SAMPLE_IDENTIFIER)
1434 		result += sizeof(u64);
1435 
1436 	if (type & PERF_SAMPLE_IP)
1437 		result += sizeof(u64);
1438 
1439 	if (type & PERF_SAMPLE_TID)
1440 		result += sizeof(u64);
1441 
1442 	if (type & PERF_SAMPLE_TIME)
1443 		result += sizeof(u64);
1444 
1445 	if (type & PERF_SAMPLE_ADDR)
1446 		result += sizeof(u64);
1447 
1448 	if (type & PERF_SAMPLE_ID)
1449 		result += sizeof(u64);
1450 
1451 	if (type & PERF_SAMPLE_STREAM_ID)
1452 		result += sizeof(u64);
1453 
1454 	if (type & PERF_SAMPLE_CPU)
1455 		result += sizeof(u64);
1456 
1457 	if (type & PERF_SAMPLE_PERIOD)
1458 		result += sizeof(u64);
1459 
1460 	if (type & PERF_SAMPLE_READ) {
1461 		result += sizeof(u64);
1462 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1463 			result += sizeof(u64);
1464 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1465 			result += sizeof(u64);
1466 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1467 		if (read_format & PERF_FORMAT_GROUP) {
1468 			sz = sample_read_value_size(read_format);
1469 			result += sz * sample->read.group.nr;
1470 		} else {
1471 			result += sizeof(u64);
1472 			if (read_format & PERF_FORMAT_LOST)
1473 				result += sizeof(u64);
1474 		}
1475 	}
1476 
1477 	if (type & PERF_SAMPLE_CALLCHAIN) {
1478 		sz = (sample->callchain->nr + 1) * sizeof(u64);
1479 		result += sz;
1480 	}
1481 
1482 	if (type & PERF_SAMPLE_RAW) {
1483 		result += sizeof(u32);
1484 		result += sample->raw_size;
1485 	}
1486 
1487 	if (type & PERF_SAMPLE_BRANCH_STACK) {
1488 		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1489 		/* nr, hw_idx */
1490 		sz += 2 * sizeof(u64);
1491 		result += sz;
1492 	}
1493 
1494 	if (type & PERF_SAMPLE_REGS_USER) {
1495 		if (sample->user_regs.abi) {
1496 			result += sizeof(u64);
1497 			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1498 			result += sz;
1499 		} else {
1500 			result += sizeof(u64);
1501 		}
1502 	}
1503 
1504 	if (type & PERF_SAMPLE_STACK_USER) {
1505 		sz = sample->user_stack.size;
1506 		result += sizeof(u64);
1507 		if (sz) {
1508 			result += sz;
1509 			result += sizeof(u64);
1510 		}
1511 	}
1512 
1513 	if (type & PERF_SAMPLE_WEIGHT_TYPE)
1514 		result += sizeof(u64);
1515 
1516 	if (type & PERF_SAMPLE_DATA_SRC)
1517 		result += sizeof(u64);
1518 
1519 	if (type & PERF_SAMPLE_TRANSACTION)
1520 		result += sizeof(u64);
1521 
1522 	if (type & PERF_SAMPLE_REGS_INTR) {
1523 		if (sample->intr_regs.abi) {
1524 			result += sizeof(u64);
1525 			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1526 			result += sz;
1527 		} else {
1528 			result += sizeof(u64);
1529 		}
1530 	}
1531 
1532 	if (type & PERF_SAMPLE_PHYS_ADDR)
1533 		result += sizeof(u64);
1534 
1535 	if (type & PERF_SAMPLE_CGROUP)
1536 		result += sizeof(u64);
1537 
1538 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1539 		result += sizeof(u64);
1540 
1541 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1542 		result += sizeof(u64);
1543 
1544 	if (type & PERF_SAMPLE_AUX) {
1545 		result += sizeof(u64);
1546 		result += sample->aux_sample.size;
1547 	}
1548 
1549 	return result;
1550 }
1551 
1552 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1553 					       __u64 *array, u64 type __maybe_unused)
1554 {
1555 	*array = data->weight;
1556 }
1557 
1558 static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1559 				     const struct perf_sample *sample)
1560 {
1561 	size_t sz = sample_read_value_size(read_format);
1562 	struct sample_read_value *v = sample->read.group.values;
1563 
1564 	sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1565 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1566 		memcpy(array, v, sz);
1567 		array = (void *)array + sz;
1568 	}
1569 	return array;
1570 }
1571 
1572 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1573 				  const struct perf_sample *sample)
1574 {
1575 	__u64 *array;
1576 	size_t sz;
1577 	/*
1578 	 * used for cross-endian analysis. See git commit 65014ab3
1579 	 * for why this goofiness is needed.
1580 	 */
1581 	union u64_swap u;
1582 
1583 	array = event->sample.array;
1584 
1585 	if (type & PERF_SAMPLE_IDENTIFIER) {
1586 		*array = sample->id;
1587 		array++;
1588 	}
1589 
1590 	if (type & PERF_SAMPLE_IP) {
1591 		*array = sample->ip;
1592 		array++;
1593 	}
1594 
1595 	if (type & PERF_SAMPLE_TID) {
1596 		u.val32[0] = sample->pid;
1597 		u.val32[1] = sample->tid;
1598 		*array = u.val64;
1599 		array++;
1600 	}
1601 
1602 	if (type & PERF_SAMPLE_TIME) {
1603 		*array = sample->time;
1604 		array++;
1605 	}
1606 
1607 	if (type & PERF_SAMPLE_ADDR) {
1608 		*array = sample->addr;
1609 		array++;
1610 	}
1611 
1612 	if (type & PERF_SAMPLE_ID) {
1613 		*array = sample->id;
1614 		array++;
1615 	}
1616 
1617 	if (type & PERF_SAMPLE_STREAM_ID) {
1618 		*array = sample->stream_id;
1619 		array++;
1620 	}
1621 
1622 	if (type & PERF_SAMPLE_CPU) {
1623 		u.val32[0] = sample->cpu;
1624 		u.val32[1] = 0;
1625 		*array = u.val64;
1626 		array++;
1627 	}
1628 
1629 	if (type & PERF_SAMPLE_PERIOD) {
1630 		*array = sample->period;
1631 		array++;
1632 	}
1633 
1634 	if (type & PERF_SAMPLE_READ) {
1635 		if (read_format & PERF_FORMAT_GROUP)
1636 			*array = sample->read.group.nr;
1637 		else
1638 			*array = sample->read.one.value;
1639 		array++;
1640 
1641 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1642 			*array = sample->read.time_enabled;
1643 			array++;
1644 		}
1645 
1646 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1647 			*array = sample->read.time_running;
1648 			array++;
1649 		}
1650 
1651 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1652 		if (read_format & PERF_FORMAT_GROUP) {
1653 			array = copy_read_group_values(array, read_format,
1654 						       sample);
1655 		} else {
1656 			*array = sample->read.one.id;
1657 			array++;
1658 
1659 			if (read_format & PERF_FORMAT_LOST) {
1660 				*array = sample->read.one.lost;
1661 				array++;
1662 			}
1663 		}
1664 	}
1665 
1666 	if (type & PERF_SAMPLE_CALLCHAIN) {
1667 		sz = (sample->callchain->nr + 1) * sizeof(u64);
1668 		memcpy(array, sample->callchain, sz);
1669 		array = (void *)array + sz;
1670 	}
1671 
1672 	if (type & PERF_SAMPLE_RAW) {
1673 		u.val32[0] = sample->raw_size;
1674 		*array = u.val64;
1675 		array = (void *)array + sizeof(u32);
1676 
1677 		memcpy(array, sample->raw_data, sample->raw_size);
1678 		array = (void *)array + sample->raw_size;
1679 	}
1680 
1681 	if (type & PERF_SAMPLE_BRANCH_STACK) {
1682 		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1683 		/* nr, hw_idx */
1684 		sz += 2 * sizeof(u64);
1685 		memcpy(array, sample->branch_stack, sz);
1686 		array = (void *)array + sz;
1687 	}
1688 
1689 	if (type & PERF_SAMPLE_REGS_USER) {
1690 		if (sample->user_regs.abi) {
1691 			*array++ = sample->user_regs.abi;
1692 			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1693 			memcpy(array, sample->user_regs.regs, sz);
1694 			array = (void *)array + sz;
1695 		} else {
1696 			*array++ = 0;
1697 		}
1698 	}
1699 
1700 	if (type & PERF_SAMPLE_STACK_USER) {
1701 		sz = sample->user_stack.size;
1702 		*array++ = sz;
1703 		if (sz) {
1704 			memcpy(array, sample->user_stack.data, sz);
1705 			array = (void *)array + sz;
1706 			*array++ = sz;
1707 		}
1708 	}
1709 
1710 	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1711 		arch_perf_synthesize_sample_weight(sample, array, type);
1712 		array++;
1713 	}
1714 
1715 	if (type & PERF_SAMPLE_DATA_SRC) {
1716 		*array = sample->data_src;
1717 		array++;
1718 	}
1719 
1720 	if (type & PERF_SAMPLE_TRANSACTION) {
1721 		*array = sample->transaction;
1722 		array++;
1723 	}
1724 
1725 	if (type & PERF_SAMPLE_REGS_INTR) {
1726 		if (sample->intr_regs.abi) {
1727 			*array++ = sample->intr_regs.abi;
1728 			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1729 			memcpy(array, sample->intr_regs.regs, sz);
1730 			array = (void *)array + sz;
1731 		} else {
1732 			*array++ = 0;
1733 		}
1734 	}
1735 
1736 	if (type & PERF_SAMPLE_PHYS_ADDR) {
1737 		*array = sample->phys_addr;
1738 		array++;
1739 	}
1740 
1741 	if (type & PERF_SAMPLE_CGROUP) {
1742 		*array = sample->cgroup;
1743 		array++;
1744 	}
1745 
1746 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1747 		*array = sample->data_page_size;
1748 		array++;
1749 	}
1750 
1751 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1752 		*array = sample->code_page_size;
1753 		array++;
1754 	}
1755 
1756 	if (type & PERF_SAMPLE_AUX) {
1757 		sz = sample->aux_sample.size;
1758 		*array++ = sz;
1759 		memcpy(array, sample->aux_sample.data, sz);
1760 		array = (void *)array + sz;
1761 	}
1762 
1763 	return 0;
1764 }
1765 
1766 int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1767 {
1768 	__u64 *start = array;
1769 
1770 	/*
1771 	 * used for cross-endian analysis. See git commit 65014ab3
1772 	 * for why this goofiness is needed.
1773 	 */
1774 	union u64_swap u;
1775 
1776 	if (type & PERF_SAMPLE_TID) {
1777 		u.val32[0] = sample->pid;
1778 		u.val32[1] = sample->tid;
1779 		*array = u.val64;
1780 		array++;
1781 	}
1782 
1783 	if (type & PERF_SAMPLE_TIME) {
1784 		*array = sample->time;
1785 		array++;
1786 	}
1787 
1788 	if (type & PERF_SAMPLE_ID) {
1789 		*array = sample->id;
1790 		array++;
1791 	}
1792 
1793 	if (type & PERF_SAMPLE_STREAM_ID) {
1794 		*array = sample->stream_id;
1795 		array++;
1796 	}
1797 
1798 	if (type & PERF_SAMPLE_CPU) {
1799 		u.val32[0] = sample->cpu;
1800 		u.val32[1] = 0;
1801 		*array = u.val64;
1802 		array++;
1803 	}
1804 
1805 	if (type & PERF_SAMPLE_IDENTIFIER) {
1806 		*array = sample->id;
1807 		array++;
1808 	}
1809 
1810 	return (void *)array - (void *)start;
1811 }
1812 
1813 int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1814 				      struct evlist *evlist, struct machine *machine, size_t from)
1815 {
1816 	union perf_event *ev;
1817 	struct evsel *evsel;
1818 	size_t nr = 0, i = 0, sz, max_nr, n, pos;
1819 	size_t e1_sz = sizeof(struct id_index_entry);
1820 	size_t e2_sz = sizeof(struct id_index_entry_2);
1821 	size_t etot_sz = e1_sz + e2_sz;
1822 	bool e2_needed = false;
1823 	int err;
1824 
1825 	max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1826 
1827 	pos = 0;
1828 	evlist__for_each_entry(evlist, evsel) {
1829 		if (pos++ < from)
1830 			continue;
1831 		nr += evsel->core.ids;
1832 	}
1833 
1834 	if (!nr)
1835 		return 0;
1836 
1837 	pr_debug2("Synthesizing id index\n");
1838 
1839 	n = nr > max_nr ? max_nr : nr;
1840 	sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1841 	ev = zalloc(sz);
1842 	if (!ev)
1843 		return -ENOMEM;
1844 
1845 	sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1846 
1847 	ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1848 	ev->id_index.nr = n;
1849 
1850 	pos = 0;
1851 	evlist__for_each_entry(evlist, evsel) {
1852 		u32 j;
1853 
1854 		if (pos++ < from)
1855 			continue;
1856 		for (j = 0; j < evsel->core.ids; j++, i++) {
1857 			struct id_index_entry *e;
1858 			struct id_index_entry_2 *e2;
1859 			struct perf_sample_id *sid;
1860 
1861 			if (i >= n) {
1862 				ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1863 				err = process(tool, ev, NULL, machine);
1864 				if (err)
1865 					goto out_err;
1866 				nr -= n;
1867 				i = 0;
1868 				e2_needed = false;
1869 			}
1870 
1871 			e = &ev->id_index.entries[i];
1872 
1873 			e->id = evsel->core.id[j];
1874 
1875 			sid = evlist__id2sid(evlist, e->id);
1876 			if (!sid) {
1877 				free(ev);
1878 				return -ENOENT;
1879 			}
1880 
1881 			e->idx = sid->idx;
1882 			e->cpu = sid->cpu.cpu;
1883 			e->tid = sid->tid;
1884 
1885 			if (sid->machine_pid)
1886 				e2_needed = true;
1887 
1888 			e2 = (void *)ev + sz;
1889 			e2[i].machine_pid = sid->machine_pid;
1890 			e2[i].vcpu        = sid->vcpu.cpu;
1891 		}
1892 	}
1893 
1894 	sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1895 	ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1896 	ev->id_index.nr = nr;
1897 
1898 	err = process(tool, ev, NULL, machine);
1899 out_err:
1900 	free(ev);
1901 
1902 	return err;
1903 }
1904 
1905 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1906 				    struct evlist *evlist, struct machine *machine)
1907 {
1908 	return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1909 }
1910 
1911 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1912 				  struct target *target, struct perf_thread_map *threads,
1913 				  perf_event__handler_t process, bool needs_mmap,
1914 				  bool data_mmap, unsigned int nr_threads_synthesize)
1915 {
1916 	/*
1917 	 * When perf runs in non-root PID namespace, and the namespace's proc FS
1918 	 * is not mounted, nsinfo__is_in_root_namespace() returns false.
1919 	 * In this case, the proc FS is coming for the parent namespace, thus
1920 	 * perf tool will wrongly gather process info from its parent PID
1921 	 * namespace.
1922 	 *
1923 	 * To avoid the confusion that the perf tool runs in a child PID
1924 	 * namespace but it synthesizes thread info from its parent PID
1925 	 * namespace, returns failure with warning.
1926 	 */
1927 	if (!nsinfo__is_in_root_namespace()) {
1928 		pr_err("Perf runs in non-root PID namespace but it tries to ");
1929 		pr_err("gather process info from its parent PID namespace.\n");
1930 		pr_err("Please mount the proc file system properly, e.g. ");
1931 		pr_err("add the option '--mount-proc' for unshare command.\n");
1932 		return -EPERM;
1933 	}
1934 
1935 	if (target__has_task(target))
1936 		return perf_event__synthesize_thread_map(tool, threads, process, machine,
1937 							 needs_mmap, data_mmap);
1938 	else if (target__has_cpu(target))
1939 		return perf_event__synthesize_threads(tool, process, machine,
1940 						      needs_mmap, data_mmap,
1941 						      nr_threads_synthesize);
1942 	/* command specified */
1943 	return 0;
1944 }
1945 
1946 int machine__synthesize_threads(struct machine *machine, struct target *target,
1947 				struct perf_thread_map *threads, bool needs_mmap,
1948 				bool data_mmap, unsigned int nr_threads_synthesize)
1949 {
1950 	return __machine__synthesize_threads(machine, NULL, target, threads,
1951 					     perf_event__process, needs_mmap,
1952 					     data_mmap, nr_threads_synthesize);
1953 }
1954 
1955 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1956 {
1957 	struct perf_record_event_update *ev;
1958 
1959 	size += sizeof(*ev);
1960 	size  = PERF_ALIGN(size, sizeof(u64));
1961 
1962 	ev = zalloc(size);
1963 	if (ev) {
1964 		ev->header.type = PERF_RECORD_EVENT_UPDATE;
1965 		ev->header.size = (u16)size;
1966 		ev->type	= type;
1967 		ev->id		= id;
1968 	}
1969 	return ev;
1970 }
1971 
1972 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1973 					     perf_event__handler_t process)
1974 {
1975 	size_t size = strlen(evsel->unit);
1976 	struct perf_record_event_update *ev;
1977 	int err;
1978 
1979 	ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1980 	if (ev == NULL)
1981 		return -ENOMEM;
1982 
1983 	strlcpy(ev->unit, evsel->unit, size + 1);
1984 	err = process(tool, (union perf_event *)ev, NULL, NULL);
1985 	free(ev);
1986 	return err;
1987 }
1988 
1989 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1990 					      perf_event__handler_t process)
1991 {
1992 	struct perf_record_event_update *ev;
1993 	struct perf_record_event_update_scale *ev_data;
1994 	int err;
1995 
1996 	ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1997 	if (ev == NULL)
1998 		return -ENOMEM;
1999 
2000 	ev->scale.scale = evsel->scale;
2001 	err = process(tool, (union perf_event *)ev, NULL, NULL);
2002 	free(ev);
2003 	return err;
2004 }
2005 
2006 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
2007 					     perf_event__handler_t process)
2008 {
2009 	struct perf_record_event_update *ev;
2010 	size_t len = strlen(evsel__name(evsel));
2011 	int err;
2012 
2013 	ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
2014 	if (ev == NULL)
2015 		return -ENOMEM;
2016 
2017 	strlcpy(ev->name, evsel->name, len + 1);
2018 	err = process(tool, (union perf_event *)ev, NULL, NULL);
2019 	free(ev);
2020 	return err;
2021 }
2022 
2023 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
2024 					     perf_event__handler_t process)
2025 {
2026 	struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
2027 	struct perf_record_event_update *ev;
2028 	int err;
2029 
2030 	ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64));
2031 	if (!ev)
2032 		return -ENOMEM;
2033 
2034 	syn_data.data = &ev->cpus.cpus;
2035 	ev->header.type = PERF_RECORD_EVENT_UPDATE;
2036 	ev->header.size = (u16)syn_data.size;
2037 	ev->type	= PERF_EVENT_UPDATE__CPUS;
2038 	ev->id		= evsel->core.id[0];
2039 	cpu_map_data__synthesize(&syn_data);
2040 
2041 	err = process(tool, (union perf_event *)ev, NULL, NULL);
2042 	free(ev);
2043 	return err;
2044 }
2045 
2046 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
2047 				 perf_event__handler_t process)
2048 {
2049 	struct evsel *evsel;
2050 	int err = 0;
2051 
2052 	evlist__for_each_entry(evlist, evsel) {
2053 		err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2054 						  evsel->core.id, process);
2055 		if (err) {
2056 			pr_debug("failed to create perf header attribute\n");
2057 			return err;
2058 		}
2059 	}
2060 
2061 	return err;
2062 }
2063 
2064 static bool has_unit(struct evsel *evsel)
2065 {
2066 	return evsel->unit && *evsel->unit;
2067 }
2068 
2069 static bool has_scale(struct evsel *evsel)
2070 {
2071 	return evsel->scale != 1;
2072 }
2073 
2074 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
2075 				      perf_event__handler_t process, bool is_pipe)
2076 {
2077 	struct evsel *evsel;
2078 	int err;
2079 
2080 	/*
2081 	 * Synthesize other events stuff not carried within
2082 	 * attr event - unit, scale, name
2083 	 */
2084 	evlist__for_each_entry(evsel_list, evsel) {
2085 		if (!evsel->supported)
2086 			continue;
2087 
2088 		/*
2089 		 * Synthesize unit and scale only if it's defined.
2090 		 */
2091 		if (has_unit(evsel)) {
2092 			err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2093 			if (err < 0) {
2094 				pr_err("Couldn't synthesize evsel unit.\n");
2095 				return err;
2096 			}
2097 		}
2098 
2099 		if (has_scale(evsel)) {
2100 			err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2101 			if (err < 0) {
2102 				pr_err("Couldn't synthesize evsel evsel.\n");
2103 				return err;
2104 			}
2105 		}
2106 
2107 		if (evsel->core.own_cpus) {
2108 			err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2109 			if (err < 0) {
2110 				pr_err("Couldn't synthesize evsel cpus.\n");
2111 				return err;
2112 			}
2113 		}
2114 
2115 		/*
2116 		 * Name is needed only for pipe output,
2117 		 * perf.data carries event names.
2118 		 */
2119 		if (is_pipe) {
2120 			err = perf_event__synthesize_event_update_name(tool, evsel, process);
2121 			if (err < 0) {
2122 				pr_err("Couldn't synthesize evsel name.\n");
2123 				return err;
2124 			}
2125 		}
2126 	}
2127 	return 0;
2128 }
2129 
2130 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2131 				u32 ids, u64 *id, perf_event__handler_t process)
2132 {
2133 	union perf_event *ev;
2134 	size_t size;
2135 	int err;
2136 
2137 	size = sizeof(struct perf_event_attr);
2138 	size = PERF_ALIGN(size, sizeof(u64));
2139 	size += sizeof(struct perf_event_header);
2140 	size += ids * sizeof(u64);
2141 
2142 	ev = zalloc(size);
2143 
2144 	if (ev == NULL)
2145 		return -ENOMEM;
2146 
2147 	ev->attr.attr = *attr;
2148 	memcpy(ev->attr.id, id, ids * sizeof(u64));
2149 
2150 	ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2151 	ev->attr.header.size = (u16)size;
2152 
2153 	if (ev->attr.header.size == size)
2154 		err = process(tool, ev, NULL, NULL);
2155 	else
2156 		err = -E2BIG;
2157 
2158 	free(ev);
2159 
2160 	return err;
2161 }
2162 
2163 #ifdef HAVE_LIBTRACEEVENT
2164 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2165 					perf_event__handler_t process)
2166 {
2167 	union perf_event ev;
2168 	struct tracing_data *tdata;
2169 	ssize_t size = 0, aligned_size = 0, padding;
2170 	struct feat_fd ff;
2171 
2172 	/*
2173 	 * We are going to store the size of the data followed
2174 	 * by the data contents. Since the fd descriptor is a pipe,
2175 	 * we cannot seek back to store the size of the data once
2176 	 * we know it. Instead we:
2177 	 *
2178 	 * - write the tracing data to the temp file
2179 	 * - get/write the data size to pipe
2180 	 * - write the tracing data from the temp file
2181 	 *   to the pipe
2182 	 */
2183 	tdata = tracing_data_get(&evlist->core.entries, fd, true);
2184 	if (!tdata)
2185 		return -1;
2186 
2187 	memset(&ev, 0, sizeof(ev));
2188 
2189 	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2190 	size = tdata->size;
2191 	aligned_size = PERF_ALIGN(size, sizeof(u64));
2192 	padding = aligned_size - size;
2193 	ev.tracing_data.header.size = sizeof(ev.tracing_data);
2194 	ev.tracing_data.size = aligned_size;
2195 
2196 	process(tool, &ev, NULL, NULL);
2197 
2198 	/*
2199 	 * The put function will copy all the tracing data
2200 	 * stored in temp file to the pipe.
2201 	 */
2202 	tracing_data_put(tdata);
2203 
2204 	ff = (struct feat_fd){ .fd = fd };
2205 	if (write_padded(&ff, NULL, 0, padding))
2206 		return -1;
2207 
2208 	return aligned_size;
2209 }
2210 #endif
2211 
2212 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2213 				    perf_event__handler_t process, struct machine *machine)
2214 {
2215 	union perf_event ev;
2216 	size_t len;
2217 
2218 	if (!pos->hit)
2219 		return 0;
2220 
2221 	memset(&ev, 0, sizeof(ev));
2222 
2223 	len = pos->long_name_len + 1;
2224 	len = PERF_ALIGN(len, NAME_ALIGN);
2225 	ev.build_id.size = min(pos->bid.size, sizeof(pos->bid.data));
2226 	memcpy(&ev.build_id.build_id, pos->bid.data, ev.build_id.size);
2227 	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2228 	ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
2229 	ev.build_id.pid = machine->pid;
2230 	ev.build_id.header.size = sizeof(ev.build_id) + len;
2231 	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2232 
2233 	return process(tool, &ev, NULL, machine);
2234 }
2235 
2236 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2237 				       struct evlist *evlist, perf_event__handler_t process, bool attrs)
2238 {
2239 	int err;
2240 
2241 	if (attrs) {
2242 		err = perf_event__synthesize_attrs(tool, evlist, process);
2243 		if (err < 0) {
2244 			pr_err("Couldn't synthesize attrs.\n");
2245 			return err;
2246 		}
2247 	}
2248 
2249 	err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2250 	err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2251 	if (err < 0) {
2252 		pr_err("Couldn't synthesize thread map.\n");
2253 		return err;
2254 	}
2255 
2256 	err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2257 	if (err < 0) {
2258 		pr_err("Couldn't synthesize thread map.\n");
2259 		return err;
2260 	}
2261 
2262 	err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2263 	if (err < 0) {
2264 		pr_err("Couldn't synthesize config.\n");
2265 		return err;
2266 	}
2267 
2268 	return 0;
2269 }
2270 
2271 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2272 
2273 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2274 				    struct evlist *evlist, perf_event__handler_t process)
2275 {
2276 	struct perf_header *header = &session->header;
2277 	struct perf_record_header_feature *fe;
2278 	struct feat_fd ff;
2279 	size_t sz, sz_hdr;
2280 	int feat, ret;
2281 
2282 	sz_hdr = sizeof(fe->header);
2283 	sz = sizeof(union perf_event);
2284 	/* get a nice alignment */
2285 	sz = PERF_ALIGN(sz, page_size);
2286 
2287 	memset(&ff, 0, sizeof(ff));
2288 
2289 	ff.buf = malloc(sz);
2290 	if (!ff.buf)
2291 		return -ENOMEM;
2292 
2293 	ff.size = sz - sz_hdr;
2294 	ff.ph = &session->header;
2295 
2296 	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2297 		if (!feat_ops[feat].synthesize) {
2298 			pr_debug("No record header feature for header :%d\n", feat);
2299 			continue;
2300 		}
2301 
2302 		ff.offset = sizeof(*fe);
2303 
2304 		ret = feat_ops[feat].write(&ff, evlist);
2305 		if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2306 			pr_debug("Error writing feature\n");
2307 			continue;
2308 		}
2309 		/* ff.buf may have changed due to realloc in do_write() */
2310 		fe = ff.buf;
2311 		memset(fe, 0, sizeof(*fe));
2312 
2313 		fe->feat_id = feat;
2314 		fe->header.type = PERF_RECORD_HEADER_FEATURE;
2315 		fe->header.size = ff.offset;
2316 
2317 		ret = process(tool, ff.buf, NULL, NULL);
2318 		if (ret) {
2319 			free(ff.buf);
2320 			return ret;
2321 		}
2322 	}
2323 
2324 	/* Send HEADER_LAST_FEATURE mark. */
2325 	fe = ff.buf;
2326 	fe->feat_id     = HEADER_LAST_FEATURE;
2327 	fe->header.type = PERF_RECORD_HEADER_FEATURE;
2328 	fe->header.size = sizeof(*fe);
2329 
2330 	ret = process(tool, ff.buf, NULL, NULL);
2331 
2332 	free(ff.buf);
2333 	return ret;
2334 }
2335 
2336 int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2337 				    struct perf_session *session,
2338 				    struct perf_data *data,
2339 				    perf_event__handler_t process)
2340 {
2341 	int err;
2342 	int ret = 0;
2343 	struct evlist *evlist = session->evlist;
2344 
2345 	/*
2346 	 * We need to synthesize events first, because some
2347 	 * features works on top of them (on report side).
2348 	 */
2349 	err = perf_event__synthesize_attrs(tool, evlist, process);
2350 	if (err < 0) {
2351 		pr_err("Couldn't synthesize attrs.\n");
2352 		return err;
2353 	}
2354 	ret += err;
2355 
2356 	err = perf_event__synthesize_features(tool, session, evlist, process);
2357 	if (err < 0) {
2358 		pr_err("Couldn't synthesize features.\n");
2359 		return err;
2360 	}
2361 	ret += err;
2362 
2363 #ifdef HAVE_LIBTRACEEVENT
2364 	if (have_tracepoints(&evlist->core.entries)) {
2365 		int fd = perf_data__fd(data);
2366 
2367 		/*
2368 		 * FIXME err <= 0 here actually means that
2369 		 * there were no tracepoints so its not really
2370 		 * an error, just that we don't need to
2371 		 * synthesize anything.  We really have to
2372 		 * return this more properly and also
2373 		 * propagate errors that now are calling die()
2374 		 */
2375 		err = perf_event__synthesize_tracing_data(tool,	fd, evlist,
2376 							  process);
2377 		if (err <= 0) {
2378 			pr_err("Couldn't record tracing data.\n");
2379 			return err;
2380 		}
2381 		ret += err;
2382 	}
2383 #else
2384 	(void)data;
2385 #endif
2386 
2387 	return ret;
2388 }
2389 
2390 int parse_synth_opt(char *synth)
2391 {
2392 	char *p, *q;
2393 	int ret = 0;
2394 
2395 	if (synth == NULL)
2396 		return -1;
2397 
2398 	for (q = synth; (p = strsep(&q, ",")); p = q) {
2399 		if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2400 			return 0;
2401 
2402 		if (!strcasecmp(p, "all"))
2403 			return PERF_SYNTH_ALL;
2404 
2405 		if (!strcasecmp(p, "task"))
2406 			ret |= PERF_SYNTH_TASK;
2407 		else if (!strcasecmp(p, "mmap"))
2408 			ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2409 		else if (!strcasecmp(p, "cgroup"))
2410 			ret |= PERF_SYNTH_CGROUP;
2411 		else
2412 			return -1;
2413 	}
2414 
2415 	return ret;
2416 }
2417