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 					     bool is_kernel)
368 {
369 	struct build_id bid;
370 	int rc;
371 
372 	if (is_kernel)
373 		rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
374 	else
375 		rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
376 
377 	if (rc == 0) {
378 		memcpy(event->build_id, bid.data, sizeof(bid.data));
379 		event->build_id_size = (u8) bid.size;
380 		event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
381 		event->__reserved_1 = 0;
382 		event->__reserved_2 = 0;
383 	} else {
384 		if (event->filename[0] == '/') {
385 			pr_debug2("Failed to read build ID for %s\n",
386 				  event->filename);
387 		}
388 	}
389 }
390 
391 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
392 				       union perf_event *event,
393 				       pid_t pid, pid_t tgid,
394 				       perf_event__handler_t process,
395 				       struct machine *machine,
396 				       bool mmap_data)
397 {
398 	unsigned long long t;
399 	char bf[BUFSIZ];
400 	struct io io;
401 	bool truncation = false;
402 	unsigned long long timeout = proc_map_timeout * 1000000ULL;
403 	int rc = 0;
404 	const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
405 	int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
406 
407 	if (machine__is_default_guest(machine))
408 		return 0;
409 
410 	snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
411 		machine->root_dir, pid, pid);
412 
413 	io.fd = open(bf, O_RDONLY, 0);
414 	if (io.fd < 0) {
415 		/*
416 		 * We raced with a task exiting - just return:
417 		 */
418 		pr_debug("couldn't open %s\n", bf);
419 		return -1;
420 	}
421 	io__init(&io, io.fd, bf, sizeof(bf));
422 
423 	event->header.type = PERF_RECORD_MMAP2;
424 	t = rdclock();
425 
426 	while (!io.eof) {
427 		static const char anonstr[] = "//anon";
428 		size_t size, aligned_size;
429 
430 		/* ensure null termination since stack will be reused. */
431 		event->mmap2.filename[0] = '\0';
432 
433 		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
434 		if (!read_proc_maps_line(&io,
435 					&event->mmap2.start,
436 					&event->mmap2.len,
437 					&event->mmap2.prot,
438 					&event->mmap2.flags,
439 					&event->mmap2.pgoff,
440 					&event->mmap2.maj,
441 					&event->mmap2.min,
442 					&event->mmap2.ino,
443 					sizeof(event->mmap2.filename),
444 					event->mmap2.filename))
445 			continue;
446 
447 		if ((rdclock() - t) > timeout) {
448 			pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
449 				   "You may want to increase "
450 				   "the time limit by --proc-map-timeout\n",
451 				   machine->root_dir, pid, pid);
452 			truncation = true;
453 			goto out;
454 		}
455 
456 		event->mmap2.ino_generation = 0;
457 
458 		/*
459 		 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
460 		 */
461 		if (machine__is_host(machine))
462 			event->header.misc = PERF_RECORD_MISC_USER;
463 		else
464 			event->header.misc = PERF_RECORD_MISC_GUEST_USER;
465 
466 		if ((event->mmap2.prot & PROT_EXEC) == 0) {
467 			if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
468 				continue;
469 
470 			event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
471 		}
472 
473 out:
474 		if (truncation)
475 			event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
476 
477 		if (!strcmp(event->mmap2.filename, ""))
478 			strcpy(event->mmap2.filename, anonstr);
479 
480 		if (hugetlbfs_mnt_len &&
481 		    !strncmp(event->mmap2.filename, hugetlbfs_mnt,
482 			     hugetlbfs_mnt_len)) {
483 			strcpy(event->mmap2.filename, anonstr);
484 			event->mmap2.flags |= MAP_HUGETLB;
485 		}
486 
487 		size = strlen(event->mmap2.filename) + 1;
488 		aligned_size = PERF_ALIGN(size, sizeof(u64));
489 		event->mmap2.len -= event->mmap.start;
490 		event->mmap2.header.size = (sizeof(event->mmap2) -
491 					(sizeof(event->mmap2.filename) - aligned_size));
492 		memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
493 			(aligned_size - size));
494 		event->mmap2.header.size += machine->id_hdr_size;
495 		event->mmap2.pid = tgid;
496 		event->mmap2.tid = pid;
497 
498 		if (symbol_conf.buildid_mmap2)
499 			perf_record_mmap2__read_build_id(&event->mmap2, false);
500 
501 		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
502 			rc = -1;
503 			break;
504 		}
505 
506 		if (truncation)
507 			break;
508 	}
509 
510 	close(io.fd);
511 	return rc;
512 }
513 
514 #ifdef HAVE_FILE_HANDLE
515 static int perf_event__synthesize_cgroup(struct perf_tool *tool,
516 					 union perf_event *event,
517 					 char *path, size_t mount_len,
518 					 perf_event__handler_t process,
519 					 struct machine *machine)
520 {
521 	size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
522 	size_t path_len = strlen(path) - mount_len + 1;
523 	struct {
524 		struct file_handle fh;
525 		uint64_t cgroup_id;
526 	} handle;
527 	int mount_id;
528 
529 	while (path_len % sizeof(u64))
530 		path[mount_len + path_len++] = '\0';
531 
532 	memset(&event->cgroup, 0, event_size);
533 
534 	event->cgroup.header.type = PERF_RECORD_CGROUP;
535 	event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
536 
537 	handle.fh.handle_bytes = sizeof(handle.cgroup_id);
538 	if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
539 		pr_debug("stat failed: %s\n", path);
540 		return -1;
541 	}
542 
543 	event->cgroup.id = handle.cgroup_id;
544 	strncpy(event->cgroup.path, path + mount_len, path_len);
545 	memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
546 
547 	if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
548 		pr_debug("process synth event failed\n");
549 		return -1;
550 	}
551 
552 	return 0;
553 }
554 
555 static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
556 					union perf_event *event,
557 					char *path, size_t mount_len,
558 					perf_event__handler_t process,
559 					struct machine *machine)
560 {
561 	size_t pos = strlen(path);
562 	DIR *d;
563 	struct dirent *dent;
564 	int ret = 0;
565 
566 	if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
567 					  process, machine) < 0)
568 		return -1;
569 
570 	d = opendir(path);
571 	if (d == NULL) {
572 		pr_debug("failed to open directory: %s\n", path);
573 		return -1;
574 	}
575 
576 	while ((dent = readdir(d)) != NULL) {
577 		if (dent->d_type != DT_DIR)
578 			continue;
579 		if (!strcmp(dent->d_name, ".") ||
580 		    !strcmp(dent->d_name, ".."))
581 			continue;
582 
583 		/* any sane path should be less than PATH_MAX */
584 		if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
585 			continue;
586 
587 		if (path[pos - 1] != '/')
588 			strcat(path, "/");
589 		strcat(path, dent->d_name);
590 
591 		ret = perf_event__walk_cgroup_tree(tool, event, path,
592 						   mount_len, process, machine);
593 		if (ret < 0)
594 			break;
595 
596 		path[pos] = '\0';
597 	}
598 
599 	closedir(d);
600 	return ret;
601 }
602 
603 int perf_event__synthesize_cgroups(struct perf_tool *tool,
604 				   perf_event__handler_t process,
605 				   struct machine *machine)
606 {
607 	union perf_event event;
608 	char cgrp_root[PATH_MAX];
609 	size_t mount_len;  /* length of mount point in the path */
610 
611 	if (!tool || !tool->cgroup_events)
612 		return 0;
613 
614 	if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
615 		pr_debug("cannot find cgroup mount point\n");
616 		return -1;
617 	}
618 
619 	mount_len = strlen(cgrp_root);
620 	/* make sure the path starts with a slash (after mount point) */
621 	strcat(cgrp_root, "/");
622 
623 	if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
624 					 process, machine) < 0)
625 		return -1;
626 
627 	return 0;
628 }
629 #else
630 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
631 				   perf_event__handler_t process __maybe_unused,
632 				   struct machine *machine __maybe_unused)
633 {
634 	return -1;
635 }
636 #endif
637 
638 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
639 				   struct machine *machine)
640 {
641 	int rc = 0;
642 	struct map *pos;
643 	struct maps *maps = machine__kernel_maps(machine);
644 	union perf_event *event;
645 	size_t size = symbol_conf.buildid_mmap2 ?
646 			sizeof(event->mmap2) : sizeof(event->mmap);
647 
648 	event = zalloc(size + machine->id_hdr_size);
649 	if (event == NULL) {
650 		pr_debug("Not enough memory synthesizing mmap event "
651 			 "for kernel modules\n");
652 		return -1;
653 	}
654 
655 	/*
656 	 * kernel uses 0 for user space maps, see kernel/perf_event.c
657 	 * __perf_event_mmap
658 	 */
659 	if (machine__is_host(machine))
660 		event->header.misc = PERF_RECORD_MISC_KERNEL;
661 	else
662 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
663 
664 	maps__for_each_entry(maps, pos) {
665 		if (!__map__is_kmodule(pos))
666 			continue;
667 
668 		if (symbol_conf.buildid_mmap2) {
669 			size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
670 			event->mmap2.header.type = PERF_RECORD_MMAP2;
671 			event->mmap2.header.size = (sizeof(event->mmap2) -
672 						(sizeof(event->mmap2.filename) - size));
673 			memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
674 			event->mmap2.header.size += machine->id_hdr_size;
675 			event->mmap2.start = pos->start;
676 			event->mmap2.len   = pos->end - pos->start;
677 			event->mmap2.pid   = machine->pid;
678 
679 			memcpy(event->mmap2.filename, pos->dso->long_name,
680 			       pos->dso->long_name_len + 1);
681 
682 			perf_record_mmap2__read_build_id(&event->mmap2, false);
683 		} else {
684 			size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
685 			event->mmap.header.type = PERF_RECORD_MMAP;
686 			event->mmap.header.size = (sizeof(event->mmap) -
687 						(sizeof(event->mmap.filename) - size));
688 			memset(event->mmap.filename + size, 0, machine->id_hdr_size);
689 			event->mmap.header.size += machine->id_hdr_size;
690 			event->mmap.start = pos->start;
691 			event->mmap.len   = pos->end - pos->start;
692 			event->mmap.pid   = machine->pid;
693 
694 			memcpy(event->mmap.filename, pos->dso->long_name,
695 			       pos->dso->long_name_len + 1);
696 		}
697 
698 		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
699 			rc = -1;
700 			break;
701 		}
702 	}
703 
704 	free(event);
705 	return rc;
706 }
707 
708 static int filter_task(const struct dirent *dirent)
709 {
710 	return isdigit(dirent->d_name[0]);
711 }
712 
713 static int __event__synthesize_thread(union perf_event *comm_event,
714 				      union perf_event *mmap_event,
715 				      union perf_event *fork_event,
716 				      union perf_event *namespaces_event,
717 				      pid_t pid, int full, perf_event__handler_t process,
718 				      struct perf_tool *tool, struct machine *machine,
719 				      bool needs_mmap, bool mmap_data)
720 {
721 	char filename[PATH_MAX];
722 	struct dirent **dirent;
723 	pid_t tgid, ppid;
724 	int rc = 0;
725 	int i, n;
726 
727 	/* special case: only send one comm event using passed in pid */
728 	if (!full) {
729 		tgid = perf_event__synthesize_comm(tool, comm_event, pid,
730 						   process, machine);
731 
732 		if (tgid == -1)
733 			return -1;
734 
735 		if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
736 						      tgid, process, machine) < 0)
737 			return -1;
738 
739 		/*
740 		 * send mmap only for thread group leader
741 		 * see thread__init_maps()
742 		 */
743 		if (pid == tgid && needs_mmap &&
744 		    perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
745 						       process, machine, mmap_data))
746 			return -1;
747 
748 		return 0;
749 	}
750 
751 	if (machine__is_default_guest(machine))
752 		return 0;
753 
754 	snprintf(filename, sizeof(filename), "%s/proc/%d/task",
755 		 machine->root_dir, pid);
756 
757 	n = scandir(filename, &dirent, filter_task, alphasort);
758 	if (n < 0)
759 		return n;
760 
761 	for (i = 0; i < n; i++) {
762 		char *end;
763 		pid_t _pid;
764 		bool kernel_thread = false;
765 
766 		_pid = strtol(dirent[i]->d_name, &end, 10);
767 		if (*end)
768 			continue;
769 
770 		rc = -1;
771 		if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
772 					     &tgid, &ppid, &kernel_thread) != 0)
773 			break;
774 
775 		if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
776 						ppid, process, machine) < 0)
777 			break;
778 
779 		if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
780 						      tgid, process, machine) < 0)
781 			break;
782 
783 		/*
784 		 * Send the prepared comm event
785 		 */
786 		if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
787 			break;
788 
789 		rc = 0;
790 		if (_pid == pid && !kernel_thread && needs_mmap) {
791 			/* process the parent's maps too */
792 			rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
793 						process, machine, mmap_data);
794 			if (rc)
795 				break;
796 		}
797 	}
798 
799 	for (i = 0; i < n; i++)
800 		zfree(&dirent[i]);
801 	free(dirent);
802 
803 	return rc;
804 }
805 
806 int perf_event__synthesize_thread_map(struct perf_tool *tool,
807 				      struct perf_thread_map *threads,
808 				      perf_event__handler_t process,
809 				      struct machine *machine,
810 				      bool needs_mmap, bool mmap_data)
811 {
812 	union perf_event *comm_event, *mmap_event, *fork_event;
813 	union perf_event *namespaces_event;
814 	int err = -1, thread, j;
815 
816 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
817 	if (comm_event == NULL)
818 		goto out;
819 
820 	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
821 	if (mmap_event == NULL)
822 		goto out_free_comm;
823 
824 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
825 	if (fork_event == NULL)
826 		goto out_free_mmap;
827 
828 	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
829 				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
830 				  machine->id_hdr_size);
831 	if (namespaces_event == NULL)
832 		goto out_free_fork;
833 
834 	err = 0;
835 	for (thread = 0; thread < threads->nr; ++thread) {
836 		if (__event__synthesize_thread(comm_event, mmap_event,
837 					       fork_event, namespaces_event,
838 					       perf_thread_map__pid(threads, thread), 0,
839 					       process, tool, machine,
840 					       needs_mmap, mmap_data)) {
841 			err = -1;
842 			break;
843 		}
844 
845 		/*
846 		 * comm.pid is set to thread group id by
847 		 * perf_event__synthesize_comm
848 		 */
849 		if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
850 			bool need_leader = true;
851 
852 			/* is thread group leader in thread_map? */
853 			for (j = 0; j < threads->nr; ++j) {
854 				if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
855 					need_leader = false;
856 					break;
857 				}
858 			}
859 
860 			/* if not, generate events for it */
861 			if (need_leader &&
862 			    __event__synthesize_thread(comm_event, mmap_event,
863 						       fork_event, namespaces_event,
864 						       comm_event->comm.pid, 0,
865 						       process, tool, machine,
866 						       needs_mmap, mmap_data)) {
867 				err = -1;
868 				break;
869 			}
870 		}
871 	}
872 	free(namespaces_event);
873 out_free_fork:
874 	free(fork_event);
875 out_free_mmap:
876 	free(mmap_event);
877 out_free_comm:
878 	free(comm_event);
879 out:
880 	return err;
881 }
882 
883 static int __perf_event__synthesize_threads(struct perf_tool *tool,
884 					    perf_event__handler_t process,
885 					    struct machine *machine,
886 					    bool needs_mmap,
887 					    bool mmap_data,
888 					    struct dirent **dirent,
889 					    int start,
890 					    int num)
891 {
892 	union perf_event *comm_event, *mmap_event, *fork_event;
893 	union perf_event *namespaces_event;
894 	int err = -1;
895 	char *end;
896 	pid_t pid;
897 	int i;
898 
899 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
900 	if (comm_event == NULL)
901 		goto out;
902 
903 	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
904 	if (mmap_event == NULL)
905 		goto out_free_comm;
906 
907 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
908 	if (fork_event == NULL)
909 		goto out_free_mmap;
910 
911 	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
912 				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
913 				  machine->id_hdr_size);
914 	if (namespaces_event == NULL)
915 		goto out_free_fork;
916 
917 	for (i = start; i < start + num; i++) {
918 		if (!isdigit(dirent[i]->d_name[0]))
919 			continue;
920 
921 		pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
922 		/* only interested in proper numerical dirents */
923 		if (*end)
924 			continue;
925 		/*
926 		 * We may race with exiting thread, so don't stop just because
927 		 * one thread couldn't be synthesized.
928 		 */
929 		__event__synthesize_thread(comm_event, mmap_event, fork_event,
930 					   namespaces_event, pid, 1, process,
931 					   tool, machine, needs_mmap, mmap_data);
932 	}
933 	err = 0;
934 
935 	free(namespaces_event);
936 out_free_fork:
937 	free(fork_event);
938 out_free_mmap:
939 	free(mmap_event);
940 out_free_comm:
941 	free(comm_event);
942 out:
943 	return err;
944 }
945 
946 struct synthesize_threads_arg {
947 	struct perf_tool *tool;
948 	perf_event__handler_t process;
949 	struct machine *machine;
950 	bool needs_mmap;
951 	bool mmap_data;
952 	struct dirent **dirent;
953 	int num;
954 	int start;
955 };
956 
957 static void *synthesize_threads_worker(void *arg)
958 {
959 	struct synthesize_threads_arg *args = arg;
960 
961 	__perf_event__synthesize_threads(args->tool, args->process,
962 					 args->machine,
963 					 args->needs_mmap, args->mmap_data,
964 					 args->dirent,
965 					 args->start, args->num);
966 	return NULL;
967 }
968 
969 int perf_event__synthesize_threads(struct perf_tool *tool,
970 				   perf_event__handler_t process,
971 				   struct machine *machine,
972 				   bool needs_mmap, bool mmap_data,
973 				   unsigned int nr_threads_synthesize)
974 {
975 	struct synthesize_threads_arg *args = NULL;
976 	pthread_t *synthesize_threads = NULL;
977 	char proc_path[PATH_MAX];
978 	struct dirent **dirent;
979 	int num_per_thread;
980 	int m, n, i, j;
981 	int thread_nr;
982 	int base = 0;
983 	int err = -1;
984 
985 
986 	if (machine__is_default_guest(machine))
987 		return 0;
988 
989 	snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
990 	n = scandir(proc_path, &dirent, filter_task, alphasort);
991 	if (n < 0)
992 		return err;
993 
994 	if (nr_threads_synthesize == UINT_MAX)
995 		thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
996 	else
997 		thread_nr = nr_threads_synthesize;
998 
999 	if (thread_nr <= 1) {
1000 		err = __perf_event__synthesize_threads(tool, process,
1001 						       machine,
1002 						       needs_mmap, mmap_data,
1003 						       dirent, base, n);
1004 		goto free_dirent;
1005 	}
1006 	if (thread_nr > n)
1007 		thread_nr = n;
1008 
1009 	synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
1010 	if (synthesize_threads == NULL)
1011 		goto free_dirent;
1012 
1013 	args = calloc(sizeof(*args), thread_nr);
1014 	if (args == NULL)
1015 		goto free_threads;
1016 
1017 	num_per_thread = n / thread_nr;
1018 	m = n % thread_nr;
1019 	for (i = 0; i < thread_nr; i++) {
1020 		args[i].tool = tool;
1021 		args[i].process = process;
1022 		args[i].machine = machine;
1023 		args[i].needs_mmap = needs_mmap;
1024 		args[i].mmap_data = mmap_data;
1025 		args[i].dirent = dirent;
1026 	}
1027 	for (i = 0; i < m; i++) {
1028 		args[i].num = num_per_thread + 1;
1029 		args[i].start = i * args[i].num;
1030 	}
1031 	if (i != 0)
1032 		base = args[i-1].start + args[i-1].num;
1033 	for (j = i; j < thread_nr; j++) {
1034 		args[j].num = num_per_thread;
1035 		args[j].start = base + (j - i) * args[i].num;
1036 	}
1037 
1038 	for (i = 0; i < thread_nr; i++) {
1039 		if (pthread_create(&synthesize_threads[i], NULL,
1040 				   synthesize_threads_worker, &args[i]))
1041 			goto out_join;
1042 	}
1043 	err = 0;
1044 out_join:
1045 	for (i = 0; i < thread_nr; i++)
1046 		pthread_join(synthesize_threads[i], NULL);
1047 	free(args);
1048 free_threads:
1049 	free(synthesize_threads);
1050 free_dirent:
1051 	for (i = 0; i < n; i++)
1052 		zfree(&dirent[i]);
1053 	free(dirent);
1054 
1055 	return err;
1056 }
1057 
1058 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1059 					      perf_event__handler_t process __maybe_unused,
1060 					      struct machine *machine __maybe_unused)
1061 {
1062 	return 0;
1063 }
1064 
1065 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1066 						perf_event__handler_t process,
1067 						struct machine *machine)
1068 {
1069 	union perf_event *event;
1070 	size_t size = symbol_conf.buildid_mmap2 ?
1071 			sizeof(event->mmap2) : sizeof(event->mmap);
1072 	struct map *map = machine__kernel_map(machine);
1073 	struct kmap *kmap;
1074 	int err;
1075 
1076 	if (map == NULL)
1077 		return -1;
1078 
1079 	kmap = map__kmap(map);
1080 	if (!kmap->ref_reloc_sym)
1081 		return -1;
1082 
1083 	/*
1084 	 * We should get this from /sys/kernel/sections/.text, but till that is
1085 	 * available use this, and after it is use this as a fallback for older
1086 	 * kernels.
1087 	 */
1088 	event = zalloc(size + machine->id_hdr_size);
1089 	if (event == NULL) {
1090 		pr_debug("Not enough memory synthesizing mmap event "
1091 			 "for kernel modules\n");
1092 		return -1;
1093 	}
1094 
1095 	if (machine__is_host(machine)) {
1096 		/*
1097 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
1098 		 * see kernel/perf_event.c __perf_event_mmap
1099 		 */
1100 		event->header.misc = PERF_RECORD_MISC_KERNEL;
1101 	} else {
1102 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1103 	}
1104 
1105 	if (symbol_conf.buildid_mmap2) {
1106 		size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1107 				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1108 		size = PERF_ALIGN(size, sizeof(u64));
1109 		event->mmap2.header.type = PERF_RECORD_MMAP2;
1110 		event->mmap2.header.size = (sizeof(event->mmap2) -
1111 				(sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1112 		event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1113 		event->mmap2.start = map->start;
1114 		event->mmap2.len   = map->end - event->mmap.start;
1115 		event->mmap2.pid   = machine->pid;
1116 
1117 		perf_record_mmap2__read_build_id(&event->mmap2, true);
1118 	} else {
1119 		size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1120 				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1121 		size = PERF_ALIGN(size, sizeof(u64));
1122 		event->mmap.header.type = PERF_RECORD_MMAP;
1123 		event->mmap.header.size = (sizeof(event->mmap) -
1124 				(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1125 		event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1126 		event->mmap.start = map->start;
1127 		event->mmap.len   = map->end - event->mmap.start;
1128 		event->mmap.pid   = machine->pid;
1129 	}
1130 
1131 	err = perf_tool__process_synth_event(tool, event, machine, process);
1132 	free(event);
1133 
1134 	return err;
1135 }
1136 
1137 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1138 				       perf_event__handler_t process,
1139 				       struct machine *machine)
1140 {
1141 	int err;
1142 
1143 	err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1144 	if (err < 0)
1145 		return err;
1146 
1147 	return perf_event__synthesize_extra_kmaps(tool, process, machine);
1148 }
1149 
1150 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1151 				      struct perf_thread_map *threads,
1152 				      perf_event__handler_t process,
1153 				      struct machine *machine)
1154 {
1155 	union perf_event *event;
1156 	int i, err, size;
1157 
1158 	size  = sizeof(event->thread_map);
1159 	size +=	threads->nr * sizeof(event->thread_map.entries[0]);
1160 
1161 	event = zalloc(size);
1162 	if (!event)
1163 		return -ENOMEM;
1164 
1165 	event->header.type = PERF_RECORD_THREAD_MAP;
1166 	event->header.size = size;
1167 	event->thread_map.nr = threads->nr;
1168 
1169 	for (i = 0; i < threads->nr; i++) {
1170 		struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1171 		char *comm = perf_thread_map__comm(threads, i);
1172 
1173 		if (!comm)
1174 			comm = (char *) "";
1175 
1176 		entry->pid = perf_thread_map__pid(threads, i);
1177 		strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1178 	}
1179 
1180 	err = process(tool, event, NULL, machine);
1181 
1182 	free(event);
1183 	return err;
1184 }
1185 
1186 static void synthesize_cpus(struct cpu_map_entries *cpus,
1187 			    struct perf_cpu_map *map)
1188 {
1189 	int i, map_nr = perf_cpu_map__nr(map);
1190 
1191 	cpus->nr = map_nr;
1192 
1193 	for (i = 0; i < map_nr; i++)
1194 		cpus->cpu[i] = perf_cpu_map__cpu(map, i).cpu;
1195 }
1196 
1197 static void synthesize_mask(struct perf_record_record_cpu_map *mask,
1198 			    struct perf_cpu_map *map, int max)
1199 {
1200 	int i;
1201 
1202 	mask->nr = BITS_TO_LONGS(max);
1203 	mask->long_size = sizeof(long);
1204 
1205 	for (i = 0; i < perf_cpu_map__nr(map); i++)
1206 		set_bit(perf_cpu_map__cpu(map, i).cpu, mask->mask);
1207 }
1208 
1209 static size_t cpus_size(struct perf_cpu_map *map)
1210 {
1211 	return sizeof(struct cpu_map_entries) + perf_cpu_map__nr(map) * sizeof(u16);
1212 }
1213 
1214 static size_t mask_size(struct perf_cpu_map *map, int *max)
1215 {
1216 	int i;
1217 
1218 	*max = 0;
1219 
1220 	for (i = 0; i < perf_cpu_map__nr(map); i++) {
1221 		/* bit position of the cpu is + 1 */
1222 		int bit = perf_cpu_map__cpu(map, i).cpu + 1;
1223 
1224 		if (bit > *max)
1225 			*max = bit;
1226 	}
1227 
1228 	return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long);
1229 }
1230 
1231 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max)
1232 {
1233 	size_t size_cpus, size_mask;
1234 	bool is_dummy = perf_cpu_map__empty(map);
1235 
1236 	/*
1237 	 * Both array and mask data have variable size based
1238 	 * on the number of cpus and their actual values.
1239 	 * The size of the 'struct perf_record_cpu_map_data' is:
1240 	 *
1241 	 *   array = size of 'struct cpu_map_entries' +
1242 	 *           number of cpus * sizeof(u64)
1243 	 *
1244 	 *   mask  = size of 'struct perf_record_record_cpu_map' +
1245 	 *           maximum cpu bit converted to size of longs
1246 	 *
1247 	 * and finally + the size of 'struct perf_record_cpu_map_data'.
1248 	 */
1249 	size_cpus = cpus_size(map);
1250 	size_mask = mask_size(map, max);
1251 
1252 	if (is_dummy || (size_cpus < size_mask)) {
1253 		*size += size_cpus;
1254 		*type  = PERF_CPU_MAP__CPUS;
1255 	} else {
1256 		*size += size_mask;
1257 		*type  = PERF_CPU_MAP__MASK;
1258 	}
1259 
1260 	*size += sizeof(struct perf_record_cpu_map_data);
1261 	*size = PERF_ALIGN(*size, sizeof(u64));
1262 	return zalloc(*size);
1263 }
1264 
1265 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map,
1266 			      u16 type, int max)
1267 {
1268 	data->type = type;
1269 
1270 	switch (type) {
1271 	case PERF_CPU_MAP__CPUS:
1272 		synthesize_cpus((struct cpu_map_entries *) data->data, map);
1273 		break;
1274 	case PERF_CPU_MAP__MASK:
1275 		synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max);
1276 	default:
1277 		break;
1278 	}
1279 }
1280 
1281 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map)
1282 {
1283 	size_t size = sizeof(struct perf_record_cpu_map);
1284 	struct perf_record_cpu_map *event;
1285 	int max;
1286 	u16 type;
1287 
1288 	event = cpu_map_data__alloc(map, &size, &type, &max);
1289 	if (!event)
1290 		return NULL;
1291 
1292 	event->header.type = PERF_RECORD_CPU_MAP;
1293 	event->header.size = size;
1294 	event->data.type   = type;
1295 
1296 	cpu_map_data__synthesize(&event->data, map, type, max);
1297 	return event;
1298 }
1299 
1300 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1301 				   struct perf_cpu_map *map,
1302 				   perf_event__handler_t process,
1303 				   struct machine *machine)
1304 {
1305 	struct perf_record_cpu_map *event;
1306 	int err;
1307 
1308 	event = cpu_map_event__new(map);
1309 	if (!event)
1310 		return -ENOMEM;
1311 
1312 	err = process(tool, (union perf_event *) event, NULL, machine);
1313 
1314 	free(event);
1315 	return err;
1316 }
1317 
1318 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1319 				       struct perf_stat_config *config,
1320 				       perf_event__handler_t process,
1321 				       struct machine *machine)
1322 {
1323 	struct perf_record_stat_config *event;
1324 	int size, i = 0, err;
1325 
1326 	size  = sizeof(*event);
1327 	size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1328 
1329 	event = zalloc(size);
1330 	if (!event)
1331 		return -ENOMEM;
1332 
1333 	event->header.type = PERF_RECORD_STAT_CONFIG;
1334 	event->header.size = size;
1335 	event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1336 
1337 #define ADD(__term, __val)					\
1338 	event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;	\
1339 	event->data[i].val = __val;				\
1340 	i++;
1341 
1342 	ADD(AGGR_MODE,	config->aggr_mode)
1343 	ADD(INTERVAL,	config->interval)
1344 	ADD(SCALE,	config->scale)
1345 
1346 	WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1347 		  "stat config terms unbalanced\n");
1348 #undef ADD
1349 
1350 	err = process(tool, (union perf_event *) event, NULL, machine);
1351 
1352 	free(event);
1353 	return err;
1354 }
1355 
1356 int perf_event__synthesize_stat(struct perf_tool *tool,
1357 				struct perf_cpu cpu, u32 thread, u64 id,
1358 				struct perf_counts_values *count,
1359 				perf_event__handler_t process,
1360 				struct machine *machine)
1361 {
1362 	struct perf_record_stat event;
1363 
1364 	event.header.type = PERF_RECORD_STAT;
1365 	event.header.size = sizeof(event);
1366 	event.header.misc = 0;
1367 
1368 	event.id        = id;
1369 	event.cpu       = cpu.cpu;
1370 	event.thread    = thread;
1371 	event.val       = count->val;
1372 	event.ena       = count->ena;
1373 	event.run       = count->run;
1374 
1375 	return process(tool, (union perf_event *) &event, NULL, machine);
1376 }
1377 
1378 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1379 				      u64 evtime, u64 type,
1380 				      perf_event__handler_t process,
1381 				      struct machine *machine)
1382 {
1383 	struct perf_record_stat_round event;
1384 
1385 	event.header.type = PERF_RECORD_STAT_ROUND;
1386 	event.header.size = sizeof(event);
1387 	event.header.misc = 0;
1388 
1389 	event.time = evtime;
1390 	event.type = type;
1391 
1392 	return process(tool, (union perf_event *) &event, NULL, machine);
1393 }
1394 
1395 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1396 {
1397 	size_t sz, result = sizeof(struct perf_record_sample);
1398 
1399 	if (type & PERF_SAMPLE_IDENTIFIER)
1400 		result += sizeof(u64);
1401 
1402 	if (type & PERF_SAMPLE_IP)
1403 		result += sizeof(u64);
1404 
1405 	if (type & PERF_SAMPLE_TID)
1406 		result += sizeof(u64);
1407 
1408 	if (type & PERF_SAMPLE_TIME)
1409 		result += sizeof(u64);
1410 
1411 	if (type & PERF_SAMPLE_ADDR)
1412 		result += sizeof(u64);
1413 
1414 	if (type & PERF_SAMPLE_ID)
1415 		result += sizeof(u64);
1416 
1417 	if (type & PERF_SAMPLE_STREAM_ID)
1418 		result += sizeof(u64);
1419 
1420 	if (type & PERF_SAMPLE_CPU)
1421 		result += sizeof(u64);
1422 
1423 	if (type & PERF_SAMPLE_PERIOD)
1424 		result += sizeof(u64);
1425 
1426 	if (type & PERF_SAMPLE_READ) {
1427 		result += sizeof(u64);
1428 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1429 			result += sizeof(u64);
1430 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1431 			result += sizeof(u64);
1432 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1433 		if (read_format & PERF_FORMAT_GROUP) {
1434 			sz = sample->read.group.nr *
1435 			     sizeof(struct sample_read_value);
1436 			result += sz;
1437 		} else {
1438 			result += sizeof(u64);
1439 		}
1440 	}
1441 
1442 	if (type & PERF_SAMPLE_CALLCHAIN) {
1443 		sz = (sample->callchain->nr + 1) * sizeof(u64);
1444 		result += sz;
1445 	}
1446 
1447 	if (type & PERF_SAMPLE_RAW) {
1448 		result += sizeof(u32);
1449 		result += sample->raw_size;
1450 	}
1451 
1452 	if (type & PERF_SAMPLE_BRANCH_STACK) {
1453 		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1454 		/* nr, hw_idx */
1455 		sz += 2 * sizeof(u64);
1456 		result += sz;
1457 	}
1458 
1459 	if (type & PERF_SAMPLE_REGS_USER) {
1460 		if (sample->user_regs.abi) {
1461 			result += sizeof(u64);
1462 			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1463 			result += sz;
1464 		} else {
1465 			result += sizeof(u64);
1466 		}
1467 	}
1468 
1469 	if (type & PERF_SAMPLE_STACK_USER) {
1470 		sz = sample->user_stack.size;
1471 		result += sizeof(u64);
1472 		if (sz) {
1473 			result += sz;
1474 			result += sizeof(u64);
1475 		}
1476 	}
1477 
1478 	if (type & PERF_SAMPLE_WEIGHT_TYPE)
1479 		result += sizeof(u64);
1480 
1481 	if (type & PERF_SAMPLE_DATA_SRC)
1482 		result += sizeof(u64);
1483 
1484 	if (type & PERF_SAMPLE_TRANSACTION)
1485 		result += sizeof(u64);
1486 
1487 	if (type & PERF_SAMPLE_REGS_INTR) {
1488 		if (sample->intr_regs.abi) {
1489 			result += sizeof(u64);
1490 			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1491 			result += sz;
1492 		} else {
1493 			result += sizeof(u64);
1494 		}
1495 	}
1496 
1497 	if (type & PERF_SAMPLE_PHYS_ADDR)
1498 		result += sizeof(u64);
1499 
1500 	if (type & PERF_SAMPLE_CGROUP)
1501 		result += sizeof(u64);
1502 
1503 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1504 		result += sizeof(u64);
1505 
1506 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1507 		result += sizeof(u64);
1508 
1509 	if (type & PERF_SAMPLE_AUX) {
1510 		result += sizeof(u64);
1511 		result += sample->aux_sample.size;
1512 	}
1513 
1514 	return result;
1515 }
1516 
1517 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1518 					       __u64 *array, u64 type __maybe_unused)
1519 {
1520 	*array = data->weight;
1521 }
1522 
1523 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1524 				  const struct perf_sample *sample)
1525 {
1526 	__u64 *array;
1527 	size_t sz;
1528 	/*
1529 	 * used for cross-endian analysis. See git commit 65014ab3
1530 	 * for why this goofiness is needed.
1531 	 */
1532 	union u64_swap u;
1533 
1534 	array = event->sample.array;
1535 
1536 	if (type & PERF_SAMPLE_IDENTIFIER) {
1537 		*array = sample->id;
1538 		array++;
1539 	}
1540 
1541 	if (type & PERF_SAMPLE_IP) {
1542 		*array = sample->ip;
1543 		array++;
1544 	}
1545 
1546 	if (type & PERF_SAMPLE_TID) {
1547 		u.val32[0] = sample->pid;
1548 		u.val32[1] = sample->tid;
1549 		*array = u.val64;
1550 		array++;
1551 	}
1552 
1553 	if (type & PERF_SAMPLE_TIME) {
1554 		*array = sample->time;
1555 		array++;
1556 	}
1557 
1558 	if (type & PERF_SAMPLE_ADDR) {
1559 		*array = sample->addr;
1560 		array++;
1561 	}
1562 
1563 	if (type & PERF_SAMPLE_ID) {
1564 		*array = sample->id;
1565 		array++;
1566 	}
1567 
1568 	if (type & PERF_SAMPLE_STREAM_ID) {
1569 		*array = sample->stream_id;
1570 		array++;
1571 	}
1572 
1573 	if (type & PERF_SAMPLE_CPU) {
1574 		u.val32[0] = sample->cpu;
1575 		u.val32[1] = 0;
1576 		*array = u.val64;
1577 		array++;
1578 	}
1579 
1580 	if (type & PERF_SAMPLE_PERIOD) {
1581 		*array = sample->period;
1582 		array++;
1583 	}
1584 
1585 	if (type & PERF_SAMPLE_READ) {
1586 		if (read_format & PERF_FORMAT_GROUP)
1587 			*array = sample->read.group.nr;
1588 		else
1589 			*array = sample->read.one.value;
1590 		array++;
1591 
1592 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1593 			*array = sample->read.time_enabled;
1594 			array++;
1595 		}
1596 
1597 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1598 			*array = sample->read.time_running;
1599 			array++;
1600 		}
1601 
1602 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1603 		if (read_format & PERF_FORMAT_GROUP) {
1604 			sz = sample->read.group.nr *
1605 			     sizeof(struct sample_read_value);
1606 			memcpy(array, sample->read.group.values, sz);
1607 			array = (void *)array + sz;
1608 		} else {
1609 			*array = sample->read.one.id;
1610 			array++;
1611 		}
1612 	}
1613 
1614 	if (type & PERF_SAMPLE_CALLCHAIN) {
1615 		sz = (sample->callchain->nr + 1) * sizeof(u64);
1616 		memcpy(array, sample->callchain, sz);
1617 		array = (void *)array + sz;
1618 	}
1619 
1620 	if (type & PERF_SAMPLE_RAW) {
1621 		u.val32[0] = sample->raw_size;
1622 		*array = u.val64;
1623 		array = (void *)array + sizeof(u32);
1624 
1625 		memcpy(array, sample->raw_data, sample->raw_size);
1626 		array = (void *)array + sample->raw_size;
1627 	}
1628 
1629 	if (type & PERF_SAMPLE_BRANCH_STACK) {
1630 		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1631 		/* nr, hw_idx */
1632 		sz += 2 * sizeof(u64);
1633 		memcpy(array, sample->branch_stack, sz);
1634 		array = (void *)array + sz;
1635 	}
1636 
1637 	if (type & PERF_SAMPLE_REGS_USER) {
1638 		if (sample->user_regs.abi) {
1639 			*array++ = sample->user_regs.abi;
1640 			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1641 			memcpy(array, sample->user_regs.regs, sz);
1642 			array = (void *)array + sz;
1643 		} else {
1644 			*array++ = 0;
1645 		}
1646 	}
1647 
1648 	if (type & PERF_SAMPLE_STACK_USER) {
1649 		sz = sample->user_stack.size;
1650 		*array++ = sz;
1651 		if (sz) {
1652 			memcpy(array, sample->user_stack.data, sz);
1653 			array = (void *)array + sz;
1654 			*array++ = sz;
1655 		}
1656 	}
1657 
1658 	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1659 		arch_perf_synthesize_sample_weight(sample, array, type);
1660 		array++;
1661 	}
1662 
1663 	if (type & PERF_SAMPLE_DATA_SRC) {
1664 		*array = sample->data_src;
1665 		array++;
1666 	}
1667 
1668 	if (type & PERF_SAMPLE_TRANSACTION) {
1669 		*array = sample->transaction;
1670 		array++;
1671 	}
1672 
1673 	if (type & PERF_SAMPLE_REGS_INTR) {
1674 		if (sample->intr_regs.abi) {
1675 			*array++ = sample->intr_regs.abi;
1676 			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1677 			memcpy(array, sample->intr_regs.regs, sz);
1678 			array = (void *)array + sz;
1679 		} else {
1680 			*array++ = 0;
1681 		}
1682 	}
1683 
1684 	if (type & PERF_SAMPLE_PHYS_ADDR) {
1685 		*array = sample->phys_addr;
1686 		array++;
1687 	}
1688 
1689 	if (type & PERF_SAMPLE_CGROUP) {
1690 		*array = sample->cgroup;
1691 		array++;
1692 	}
1693 
1694 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1695 		*array = sample->data_page_size;
1696 		array++;
1697 	}
1698 
1699 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1700 		*array = sample->code_page_size;
1701 		array++;
1702 	}
1703 
1704 	if (type & PERF_SAMPLE_AUX) {
1705 		sz = sample->aux_sample.size;
1706 		*array++ = sz;
1707 		memcpy(array, sample->aux_sample.data, sz);
1708 		array = (void *)array + sz;
1709 	}
1710 
1711 	return 0;
1712 }
1713 
1714 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1715 				    struct evlist *evlist, struct machine *machine)
1716 {
1717 	union perf_event *ev;
1718 	struct evsel *evsel;
1719 	size_t nr = 0, i = 0, sz, max_nr, n;
1720 	int err;
1721 
1722 	pr_debug2("Synthesizing id index\n");
1723 
1724 	max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) /
1725 		 sizeof(struct id_index_entry);
1726 
1727 	evlist__for_each_entry(evlist, evsel)
1728 		nr += evsel->core.ids;
1729 
1730 	n = nr > max_nr ? max_nr : nr;
1731 	sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry);
1732 	ev = zalloc(sz);
1733 	if (!ev)
1734 		return -ENOMEM;
1735 
1736 	ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1737 	ev->id_index.header.size = sz;
1738 	ev->id_index.nr = n;
1739 
1740 	evlist__for_each_entry(evlist, evsel) {
1741 		u32 j;
1742 
1743 		for (j = 0; j < evsel->core.ids; j++) {
1744 			struct id_index_entry *e;
1745 			struct perf_sample_id *sid;
1746 
1747 			if (i >= n) {
1748 				err = process(tool, ev, NULL, machine);
1749 				if (err)
1750 					goto out_err;
1751 				nr -= n;
1752 				i = 0;
1753 			}
1754 
1755 			e = &ev->id_index.entries[i++];
1756 
1757 			e->id = evsel->core.id[j];
1758 
1759 			sid = evlist__id2sid(evlist, e->id);
1760 			if (!sid) {
1761 				free(ev);
1762 				return -ENOENT;
1763 			}
1764 
1765 			e->idx = sid->idx;
1766 			e->cpu = sid->cpu.cpu;
1767 			e->tid = sid->tid;
1768 		}
1769 	}
1770 
1771 	sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry);
1772 	ev->id_index.header.size = sz;
1773 	ev->id_index.nr = nr;
1774 
1775 	err = process(tool, ev, NULL, machine);
1776 out_err:
1777 	free(ev);
1778 
1779 	return err;
1780 }
1781 
1782 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1783 				  struct target *target, struct perf_thread_map *threads,
1784 				  perf_event__handler_t process, bool needs_mmap,
1785 				  bool data_mmap, unsigned int nr_threads_synthesize)
1786 {
1787 	/*
1788 	 * When perf runs in non-root PID namespace, and the namespace's proc FS
1789 	 * is not mounted, nsinfo__is_in_root_namespace() returns false.
1790 	 * In this case, the proc FS is coming for the parent namespace, thus
1791 	 * perf tool will wrongly gather process info from its parent PID
1792 	 * namespace.
1793 	 *
1794 	 * To avoid the confusion that the perf tool runs in a child PID
1795 	 * namespace but it synthesizes thread info from its parent PID
1796 	 * namespace, returns failure with warning.
1797 	 */
1798 	if (!nsinfo__is_in_root_namespace()) {
1799 		pr_err("Perf runs in non-root PID namespace but it tries to ");
1800 		pr_err("gather process info from its parent PID namespace.\n");
1801 		pr_err("Please mount the proc file system properly, e.g. ");
1802 		pr_err("add the option '--mount-proc' for unshare command.\n");
1803 		return -EPERM;
1804 	}
1805 
1806 	if (target__has_task(target))
1807 		return perf_event__synthesize_thread_map(tool, threads, process, machine,
1808 							 needs_mmap, data_mmap);
1809 	else if (target__has_cpu(target))
1810 		return perf_event__synthesize_threads(tool, process, machine,
1811 						      needs_mmap, data_mmap,
1812 						      nr_threads_synthesize);
1813 	/* command specified */
1814 	return 0;
1815 }
1816 
1817 int machine__synthesize_threads(struct machine *machine, struct target *target,
1818 				struct perf_thread_map *threads, bool needs_mmap,
1819 				bool data_mmap, unsigned int nr_threads_synthesize)
1820 {
1821 	return __machine__synthesize_threads(machine, NULL, target, threads,
1822 					     perf_event__process, needs_mmap,
1823 					     data_mmap, nr_threads_synthesize);
1824 }
1825 
1826 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1827 {
1828 	struct perf_record_event_update *ev;
1829 
1830 	size += sizeof(*ev);
1831 	size  = PERF_ALIGN(size, sizeof(u64));
1832 
1833 	ev = zalloc(size);
1834 	if (ev) {
1835 		ev->header.type = PERF_RECORD_EVENT_UPDATE;
1836 		ev->header.size = (u16)size;
1837 		ev->type	= type;
1838 		ev->id		= id;
1839 	}
1840 	return ev;
1841 }
1842 
1843 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1844 					     perf_event__handler_t process)
1845 {
1846 	size_t size = strlen(evsel->unit);
1847 	struct perf_record_event_update *ev;
1848 	int err;
1849 
1850 	ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1851 	if (ev == NULL)
1852 		return -ENOMEM;
1853 
1854 	strlcpy(ev->data, evsel->unit, size + 1);
1855 	err = process(tool, (union perf_event *)ev, NULL, NULL);
1856 	free(ev);
1857 	return err;
1858 }
1859 
1860 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1861 					      perf_event__handler_t process)
1862 {
1863 	struct perf_record_event_update *ev;
1864 	struct perf_record_event_update_scale *ev_data;
1865 	int err;
1866 
1867 	ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1868 	if (ev == NULL)
1869 		return -ENOMEM;
1870 
1871 	ev_data = (struct perf_record_event_update_scale *)ev->data;
1872 	ev_data->scale = evsel->scale;
1873 	err = process(tool, (union perf_event *)ev, NULL, NULL);
1874 	free(ev);
1875 	return err;
1876 }
1877 
1878 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
1879 					     perf_event__handler_t process)
1880 {
1881 	struct perf_record_event_update *ev;
1882 	size_t len = strlen(evsel->name);
1883 	int err;
1884 
1885 	ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
1886 	if (ev == NULL)
1887 		return -ENOMEM;
1888 
1889 	strlcpy(ev->data, evsel->name, len + 1);
1890 	err = process(tool, (union perf_event *)ev, NULL, NULL);
1891 	free(ev);
1892 	return err;
1893 }
1894 
1895 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
1896 					     perf_event__handler_t process)
1897 {
1898 	size_t size = sizeof(struct perf_record_event_update);
1899 	struct perf_record_event_update *ev;
1900 	int max, err;
1901 	u16 type;
1902 
1903 	if (!evsel->core.own_cpus)
1904 		return 0;
1905 
1906 	ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max);
1907 	if (!ev)
1908 		return -ENOMEM;
1909 
1910 	ev->header.type = PERF_RECORD_EVENT_UPDATE;
1911 	ev->header.size = (u16)size;
1912 	ev->type	= PERF_EVENT_UPDATE__CPUS;
1913 	ev->id		= evsel->core.id[0];
1914 
1915 	cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data,
1916 				 evsel->core.own_cpus, type, max);
1917 
1918 	err = process(tool, (union perf_event *)ev, NULL, NULL);
1919 	free(ev);
1920 	return err;
1921 }
1922 
1923 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
1924 				 perf_event__handler_t process)
1925 {
1926 	struct evsel *evsel;
1927 	int err = 0;
1928 
1929 	evlist__for_each_entry(evlist, evsel) {
1930 		err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
1931 						  evsel->core.id, process);
1932 		if (err) {
1933 			pr_debug("failed to create perf header attribute\n");
1934 			return err;
1935 		}
1936 	}
1937 
1938 	return err;
1939 }
1940 
1941 static bool has_unit(struct evsel *evsel)
1942 {
1943 	return evsel->unit && *evsel->unit;
1944 }
1945 
1946 static bool has_scale(struct evsel *evsel)
1947 {
1948 	return evsel->scale != 1;
1949 }
1950 
1951 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
1952 				      perf_event__handler_t process, bool is_pipe)
1953 {
1954 	struct evsel *evsel;
1955 	int err;
1956 
1957 	/*
1958 	 * Synthesize other events stuff not carried within
1959 	 * attr event - unit, scale, name
1960 	 */
1961 	evlist__for_each_entry(evsel_list, evsel) {
1962 		if (!evsel->supported)
1963 			continue;
1964 
1965 		/*
1966 		 * Synthesize unit and scale only if it's defined.
1967 		 */
1968 		if (has_unit(evsel)) {
1969 			err = perf_event__synthesize_event_update_unit(tool, evsel, process);
1970 			if (err < 0) {
1971 				pr_err("Couldn't synthesize evsel unit.\n");
1972 				return err;
1973 			}
1974 		}
1975 
1976 		if (has_scale(evsel)) {
1977 			err = perf_event__synthesize_event_update_scale(tool, evsel, process);
1978 			if (err < 0) {
1979 				pr_err("Couldn't synthesize evsel evsel.\n");
1980 				return err;
1981 			}
1982 		}
1983 
1984 		if (evsel->core.own_cpus) {
1985 			err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
1986 			if (err < 0) {
1987 				pr_err("Couldn't synthesize evsel cpus.\n");
1988 				return err;
1989 			}
1990 		}
1991 
1992 		/*
1993 		 * Name is needed only for pipe output,
1994 		 * perf.data carries event names.
1995 		 */
1996 		if (is_pipe) {
1997 			err = perf_event__synthesize_event_update_name(tool, evsel, process);
1998 			if (err < 0) {
1999 				pr_err("Couldn't synthesize evsel name.\n");
2000 				return err;
2001 			}
2002 		}
2003 	}
2004 	return 0;
2005 }
2006 
2007 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2008 				u32 ids, u64 *id, perf_event__handler_t process)
2009 {
2010 	union perf_event *ev;
2011 	size_t size;
2012 	int err;
2013 
2014 	size = sizeof(struct perf_event_attr);
2015 	size = PERF_ALIGN(size, sizeof(u64));
2016 	size += sizeof(struct perf_event_header);
2017 	size += ids * sizeof(u64);
2018 
2019 	ev = zalloc(size);
2020 
2021 	if (ev == NULL)
2022 		return -ENOMEM;
2023 
2024 	ev->attr.attr = *attr;
2025 	memcpy(ev->attr.id, id, ids * sizeof(u64));
2026 
2027 	ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2028 	ev->attr.header.size = (u16)size;
2029 
2030 	if (ev->attr.header.size == size)
2031 		err = process(tool, ev, NULL, NULL);
2032 	else
2033 		err = -E2BIG;
2034 
2035 	free(ev);
2036 
2037 	return err;
2038 }
2039 
2040 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2041 					perf_event__handler_t process)
2042 {
2043 	union perf_event ev;
2044 	struct tracing_data *tdata;
2045 	ssize_t size = 0, aligned_size = 0, padding;
2046 	struct feat_fd ff;
2047 
2048 	/*
2049 	 * We are going to store the size of the data followed
2050 	 * by the data contents. Since the fd descriptor is a pipe,
2051 	 * we cannot seek back to store the size of the data once
2052 	 * we know it. Instead we:
2053 	 *
2054 	 * - write the tracing data to the temp file
2055 	 * - get/write the data size to pipe
2056 	 * - write the tracing data from the temp file
2057 	 *   to the pipe
2058 	 */
2059 	tdata = tracing_data_get(&evlist->core.entries, fd, true);
2060 	if (!tdata)
2061 		return -1;
2062 
2063 	memset(&ev, 0, sizeof(ev));
2064 
2065 	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2066 	size = tdata->size;
2067 	aligned_size = PERF_ALIGN(size, sizeof(u64));
2068 	padding = aligned_size - size;
2069 	ev.tracing_data.header.size = sizeof(ev.tracing_data);
2070 	ev.tracing_data.size = aligned_size;
2071 
2072 	process(tool, &ev, NULL, NULL);
2073 
2074 	/*
2075 	 * The put function will copy all the tracing data
2076 	 * stored in temp file to the pipe.
2077 	 */
2078 	tracing_data_put(tdata);
2079 
2080 	ff = (struct feat_fd){ .fd = fd };
2081 	if (write_padded(&ff, NULL, 0, padding))
2082 		return -1;
2083 
2084 	return aligned_size;
2085 }
2086 
2087 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2088 				    perf_event__handler_t process, struct machine *machine)
2089 {
2090 	union perf_event ev;
2091 	size_t len;
2092 
2093 	if (!pos->hit)
2094 		return 0;
2095 
2096 	memset(&ev, 0, sizeof(ev));
2097 
2098 	len = pos->long_name_len + 1;
2099 	len = PERF_ALIGN(len, NAME_ALIGN);
2100 	memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
2101 	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2102 	ev.build_id.header.misc = misc;
2103 	ev.build_id.pid = machine->pid;
2104 	ev.build_id.header.size = sizeof(ev.build_id) + len;
2105 	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2106 
2107 	return process(tool, &ev, NULL, machine);
2108 }
2109 
2110 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2111 				       struct evlist *evlist, perf_event__handler_t process, bool attrs)
2112 {
2113 	int err;
2114 
2115 	if (attrs) {
2116 		err = perf_event__synthesize_attrs(tool, evlist, process);
2117 		if (err < 0) {
2118 			pr_err("Couldn't synthesize attrs.\n");
2119 			return err;
2120 		}
2121 	}
2122 
2123 	err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2124 	err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2125 	if (err < 0) {
2126 		pr_err("Couldn't synthesize thread map.\n");
2127 		return err;
2128 	}
2129 
2130 	err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2131 	if (err < 0) {
2132 		pr_err("Couldn't synthesize thread map.\n");
2133 		return err;
2134 	}
2135 
2136 	err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2137 	if (err < 0) {
2138 		pr_err("Couldn't synthesize config.\n");
2139 		return err;
2140 	}
2141 
2142 	return 0;
2143 }
2144 
2145 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2146 
2147 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2148 				    struct evlist *evlist, perf_event__handler_t process)
2149 {
2150 	struct perf_header *header = &session->header;
2151 	struct perf_record_header_feature *fe;
2152 	struct feat_fd ff;
2153 	size_t sz, sz_hdr;
2154 	int feat, ret;
2155 
2156 	sz_hdr = sizeof(fe->header);
2157 	sz = sizeof(union perf_event);
2158 	/* get a nice alignment */
2159 	sz = PERF_ALIGN(sz, page_size);
2160 
2161 	memset(&ff, 0, sizeof(ff));
2162 
2163 	ff.buf = malloc(sz);
2164 	if (!ff.buf)
2165 		return -ENOMEM;
2166 
2167 	ff.size = sz - sz_hdr;
2168 	ff.ph = &session->header;
2169 
2170 	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2171 		if (!feat_ops[feat].synthesize) {
2172 			pr_debug("No record header feature for header :%d\n", feat);
2173 			continue;
2174 		}
2175 
2176 		ff.offset = sizeof(*fe);
2177 
2178 		ret = feat_ops[feat].write(&ff, evlist);
2179 		if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2180 			pr_debug("Error writing feature\n");
2181 			continue;
2182 		}
2183 		/* ff.buf may have changed due to realloc in do_write() */
2184 		fe = ff.buf;
2185 		memset(fe, 0, sizeof(*fe));
2186 
2187 		fe->feat_id = feat;
2188 		fe->header.type = PERF_RECORD_HEADER_FEATURE;
2189 		fe->header.size = ff.offset;
2190 
2191 		ret = process(tool, ff.buf, NULL, NULL);
2192 		if (ret) {
2193 			free(ff.buf);
2194 			return ret;
2195 		}
2196 	}
2197 
2198 	/* Send HEADER_LAST_FEATURE mark. */
2199 	fe = ff.buf;
2200 	fe->feat_id     = HEADER_LAST_FEATURE;
2201 	fe->header.type = PERF_RECORD_HEADER_FEATURE;
2202 	fe->header.size = sizeof(*fe);
2203 
2204 	ret = process(tool, ff.buf, NULL, NULL);
2205 
2206 	free(ff.buf);
2207 	return ret;
2208 }
2209 
2210 int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2211 				    struct perf_session *session,
2212 				    struct perf_data *data,
2213 				    perf_event__handler_t process)
2214 {
2215 	int err;
2216 	int ret = 0;
2217 	struct evlist *evlist = session->evlist;
2218 
2219 	/*
2220 	 * We need to synthesize events first, because some
2221 	 * features works on top of them (on report side).
2222 	 */
2223 	err = perf_event__synthesize_attrs(tool, evlist, process);
2224 	if (err < 0) {
2225 		pr_err("Couldn't synthesize attrs.\n");
2226 		return err;
2227 	}
2228 	ret += err;
2229 
2230 	err = perf_event__synthesize_features(tool, session, evlist, process);
2231 	if (err < 0) {
2232 		pr_err("Couldn't synthesize features.\n");
2233 		return err;
2234 	}
2235 	ret += err;
2236 
2237 	if (have_tracepoints(&evlist->core.entries)) {
2238 		int fd = perf_data__fd(data);
2239 
2240 		/*
2241 		 * FIXME err <= 0 here actually means that
2242 		 * there were no tracepoints so its not really
2243 		 * an error, just that we don't need to
2244 		 * synthesize anything.  We really have to
2245 		 * return this more properly and also
2246 		 * propagate errors that now are calling die()
2247 		 */
2248 		err = perf_event__synthesize_tracing_data(tool,	fd, evlist,
2249 							  process);
2250 		if (err <= 0) {
2251 			pr_err("Couldn't record tracing data.\n");
2252 			return err;
2253 		}
2254 		ret += err;
2255 	}
2256 
2257 	return ret;
2258 }
2259 
2260 int parse_synth_opt(char *synth)
2261 {
2262 	char *p, *q;
2263 	int ret = 0;
2264 
2265 	if (synth == NULL)
2266 		return -1;
2267 
2268 	for (q = synth; (p = strsep(&q, ",")); p = q) {
2269 		if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2270 			return 0;
2271 
2272 		if (!strcasecmp(p, "all"))
2273 			return PERF_SYNTH_ALL;
2274 
2275 		if (!strcasecmp(p, "task"))
2276 			ret |= PERF_SYNTH_TASK;
2277 		else if (!strcasecmp(p, "mmap"))
2278 			ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2279 		else if (!strcasecmp(p, "cgroup"))
2280 			ret |= PERF_SYNTH_CGROUP;
2281 		else
2282 			return -1;
2283 	}
2284 
2285 	return ret;
2286 }
2287