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