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 <api/io_dir.h>
42 #include <sys/types.h>
43 #include <sys/stat.h>
44 #include <fcntl.h>
45 #include <unistd.h>
46 
47 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
48 
49 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
50 
perf_tool__process_synth_event(const struct perf_tool * tool,union perf_event * event,struct machine * machine,perf_event__handler_t process)51 int perf_tool__process_synth_event(const struct perf_tool *tool,
52 				   union perf_event *event,
53 				   struct machine *machine,
54 				   perf_event__handler_t process)
55 {
56 	struct perf_sample synth_sample = {
57 		.pid	   = -1,
58 		.tid	   = -1,
59 		.time	   = -1,
60 		.stream_id = -1,
61 		.cpu	   = -1,
62 		.period	   = 1,
63 		.cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
64 	};
65 
66 	return process(tool, event, &synth_sample, machine);
67 };
68 
69 /*
70  * Assumes that the first 4095 bytes of /proc/pid/stat contains
71  * the comm, tgid and ppid.
72  */
perf_event__get_comm_ids(pid_t pid,pid_t tid,char * comm,size_t len,pid_t * tgid,pid_t * ppid,bool * kernel)73 static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len,
74 				    pid_t *tgid, pid_t *ppid, bool *kernel)
75 {
76 	char bf[4096];
77 	int fd;
78 	size_t size = 0;
79 	ssize_t n;
80 	char *name, *tgids, *ppids, *vmpeak, *threads;
81 
82 	*tgid = -1;
83 	*ppid = -1;
84 
85 	if (pid)
86 		snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid);
87 	else
88 		snprintf(bf, sizeof(bf), "/proc/%d/status", tid);
89 
90 	fd = open(bf, O_RDONLY);
91 	if (fd < 0) {
92 		pr_debug("couldn't open %s\n", bf);
93 		return -1;
94 	}
95 
96 	n = read(fd, bf, sizeof(bf) - 1);
97 	close(fd);
98 	if (n <= 0) {
99 		pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
100 			   tid);
101 		return -1;
102 	}
103 	bf[n] = '\0';
104 
105 	name = strstr(bf, "Name:");
106 	tgids = strstr(name ?: bf, "Tgid:");
107 	ppids = strstr(tgids ?: bf, "PPid:");
108 	vmpeak = strstr(ppids ?: bf, "VmPeak:");
109 
110 	if (vmpeak)
111 		threads = NULL;
112 	else
113 		threads = strstr(ppids ?: bf, "Threads:");
114 
115 	if (name) {
116 		char *nl;
117 
118 		name = skip_spaces(name + 5);  /* strlen("Name:") */
119 		nl = strchr(name, '\n');
120 		if (nl)
121 			*nl = '\0';
122 
123 		size = strlen(name);
124 		if (size >= len)
125 			size = len - 1;
126 		memcpy(comm, name, size);
127 		comm[size] = '\0';
128 	} else {
129 		pr_debug("Name: string not found for pid %d\n", tid);
130 	}
131 
132 	if (tgids) {
133 		tgids += 5;  /* strlen("Tgid:") */
134 		*tgid = atoi(tgids);
135 	} else {
136 		pr_debug("Tgid: string not found for pid %d\n", tid);
137 	}
138 
139 	if (ppids) {
140 		ppids += 5;  /* strlen("PPid:") */
141 		*ppid = atoi(ppids);
142 	} else {
143 		pr_debug("PPid: string not found for pid %d\n", tid);
144 	}
145 
146 	if (!vmpeak && threads)
147 		*kernel = true;
148 	else
149 		*kernel = false;
150 
151 	return 0;
152 }
153 
perf_event__prepare_comm(union perf_event * event,pid_t pid,pid_t tid,struct machine * machine,pid_t * tgid,pid_t * ppid,bool * kernel)154 static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid,
155 				    struct machine *machine,
156 				    pid_t *tgid, pid_t *ppid, bool *kernel)
157 {
158 	size_t size;
159 
160 	*ppid = -1;
161 
162 	memset(&event->comm, 0, sizeof(event->comm));
163 
164 	if (machine__is_host(machine)) {
165 		if (perf_event__get_comm_ids(pid, tid, event->comm.comm,
166 					     sizeof(event->comm.comm),
167 					     tgid, ppid, kernel) != 0) {
168 			return -1;
169 		}
170 	} else {
171 		*tgid = machine->pid;
172 	}
173 
174 	if (*tgid < 0)
175 		return -1;
176 
177 	event->comm.pid = *tgid;
178 	event->comm.header.type = PERF_RECORD_COMM;
179 
180 	size = strlen(event->comm.comm) + 1;
181 	size = PERF_ALIGN(size, sizeof(u64));
182 	memset(event->comm.comm + size, 0, machine->id_hdr_size);
183 	event->comm.header.size = (sizeof(event->comm) -
184 				(sizeof(event->comm.comm) - size) +
185 				machine->id_hdr_size);
186 	event->comm.tid = tid;
187 
188 	return 0;
189 }
190 
perf_event__synthesize_comm(const struct perf_tool * tool,union perf_event * event,pid_t pid,perf_event__handler_t process,struct machine * machine)191 pid_t perf_event__synthesize_comm(const struct perf_tool *tool,
192 					 union perf_event *event, pid_t pid,
193 					 perf_event__handler_t process,
194 					 struct machine *machine)
195 {
196 	pid_t tgid, ppid;
197 	bool kernel_thread;
198 
199 	if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid,
200 				     &kernel_thread) != 0)
201 		return -1;
202 
203 	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
204 		return -1;
205 
206 	return tgid;
207 }
208 
perf_event__get_ns_link_info(pid_t pid,const char * ns,struct perf_ns_link_info * ns_link_info)209 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
210 					 struct perf_ns_link_info *ns_link_info)
211 {
212 	struct stat64 st;
213 	char proc_ns[128];
214 
215 	sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
216 	if (stat64(proc_ns, &st) == 0) {
217 		ns_link_info->dev = st.st_dev;
218 		ns_link_info->ino = st.st_ino;
219 	}
220 }
221 
perf_event__synthesize_namespaces(const struct perf_tool * tool,union perf_event * event,pid_t pid,pid_t tgid,perf_event__handler_t process,struct machine * machine)222 int perf_event__synthesize_namespaces(const struct perf_tool *tool,
223 				      union perf_event *event,
224 				      pid_t pid, pid_t tgid,
225 				      perf_event__handler_t process,
226 				      struct machine *machine)
227 {
228 	u32 idx;
229 	struct perf_ns_link_info *ns_link_info;
230 
231 	if (!tool || !tool->namespace_events)
232 		return 0;
233 
234 	memset(&event->namespaces, 0, (sizeof(event->namespaces) +
235 	       (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
236 	       machine->id_hdr_size));
237 
238 	event->namespaces.pid = tgid;
239 	event->namespaces.tid = pid;
240 
241 	event->namespaces.nr_namespaces = NR_NAMESPACES;
242 
243 	ns_link_info = event->namespaces.link_info;
244 
245 	for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
246 		perf_event__get_ns_link_info(pid, perf_ns__name(idx),
247 					     &ns_link_info[idx]);
248 
249 	event->namespaces.header.type = PERF_RECORD_NAMESPACES;
250 
251 	event->namespaces.header.size = (sizeof(event->namespaces) +
252 			(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
253 			machine->id_hdr_size);
254 
255 	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
256 		return -1;
257 
258 	return 0;
259 }
260 
perf_event__synthesize_fork(const struct perf_tool * tool,union perf_event * event,pid_t pid,pid_t tgid,pid_t ppid,perf_event__handler_t process,struct machine * machine)261 static int perf_event__synthesize_fork(const struct perf_tool *tool,
262 				       union perf_event *event,
263 				       pid_t pid, pid_t tgid, pid_t ppid,
264 				       perf_event__handler_t process,
265 				       struct machine *machine)
266 {
267 	memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
268 
269 	/*
270 	 * for main thread set parent to ppid from status file. For other
271 	 * threads set parent pid to main thread. ie., assume main thread
272 	 * spawns all threads in a process
273 	*/
274 	if (tgid == pid) {
275 		event->fork.ppid = ppid;
276 		event->fork.ptid = ppid;
277 	} else {
278 		event->fork.ppid = tgid;
279 		event->fork.ptid = tgid;
280 	}
281 	event->fork.pid  = tgid;
282 	event->fork.tid  = pid;
283 	event->fork.header.type = PERF_RECORD_FORK;
284 	event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
285 
286 	event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
287 
288 	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
289 		return -1;
290 
291 	return 0;
292 }
293 
read_proc_maps_line(struct io * io,__u64 * start,__u64 * end,u32 * prot,u32 * flags,__u64 * offset,u32 * maj,u32 * min,__u64 * inode,ssize_t pathname_size,char * pathname)294 static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
295 				u32 *prot, u32 *flags, __u64 *offset,
296 				u32 *maj, u32 *min,
297 				__u64 *inode,
298 				ssize_t pathname_size, char *pathname)
299 {
300 	__u64 temp;
301 	int ch;
302 	char *start_pathname = pathname;
303 
304 	if (io__get_hex(io, start) != '-')
305 		return false;
306 	if (io__get_hex(io, end) != ' ')
307 		return false;
308 
309 	/* map protection and flags bits */
310 	*prot = 0;
311 	ch = io__get_char(io);
312 	if (ch == 'r')
313 		*prot |= PROT_READ;
314 	else if (ch != '-')
315 		return false;
316 	ch = io__get_char(io);
317 	if (ch == 'w')
318 		*prot |= PROT_WRITE;
319 	else if (ch != '-')
320 		return false;
321 	ch = io__get_char(io);
322 	if (ch == 'x')
323 		*prot |= PROT_EXEC;
324 	else if (ch != '-')
325 		return false;
326 	ch = io__get_char(io);
327 	if (ch == 's')
328 		*flags = MAP_SHARED;
329 	else if (ch == 'p')
330 		*flags = MAP_PRIVATE;
331 	else
332 		return false;
333 	if (io__get_char(io) != ' ')
334 		return false;
335 
336 	if (io__get_hex(io, offset) != ' ')
337 		return false;
338 
339 	if (io__get_hex(io, &temp) != ':')
340 		return false;
341 	*maj = temp;
342 	if (io__get_hex(io, &temp) != ' ')
343 		return false;
344 	*min = temp;
345 
346 	ch = io__get_dec(io, inode);
347 	if (ch != ' ') {
348 		*pathname = '\0';
349 		return ch == '\n';
350 	}
351 	do {
352 		ch = io__get_char(io);
353 	} while (ch == ' ');
354 	while (true) {
355 		if (ch < 0)
356 			return false;
357 		if (ch == '\0' || ch == '\n' ||
358 		    (pathname + 1 - start_pathname) >= pathname_size) {
359 			*pathname = '\0';
360 			return true;
361 		}
362 		*pathname++ = ch;
363 		ch = io__get_char(io);
364 	}
365 }
366 
perf_record_mmap2__read_build_id(struct perf_record_mmap2 * event,struct machine * machine,bool is_kernel)367 static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
368 					     struct machine *machine,
369 					     bool is_kernel)
370 {
371 	struct build_id bid;
372 	struct nsinfo *nsi;
373 	struct nscookie nc;
374 	struct dso *dso = NULL;
375 	struct dso_id id;
376 	int rc;
377 
378 	if (is_kernel) {
379 		rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
380 		goto out;
381 	}
382 
383 	id.maj = event->maj;
384 	id.min = event->min;
385 	id.ino = event->ino;
386 	id.ino_generation = event->ino_generation;
387 
388 	dso = dsos__findnew_id(&machine->dsos, event->filename, &id);
389 	if (dso && dso__has_build_id(dso)) {
390 		bid = *dso__bid(dso);
391 		rc = 0;
392 		goto out;
393 	}
394 
395 	nsi = nsinfo__new(event->pid);
396 	nsinfo__mountns_enter(nsi, &nc);
397 
398 	rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
399 
400 	nsinfo__mountns_exit(&nc);
401 	nsinfo__put(nsi);
402 
403 out:
404 	if (rc == 0) {
405 		memcpy(event->build_id, bid.data, sizeof(bid.data));
406 		event->build_id_size = (u8) bid.size;
407 		event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
408 		event->__reserved_1 = 0;
409 		event->__reserved_2 = 0;
410 
411 		if (dso && !dso__has_build_id(dso))
412 			dso__set_build_id(dso, &bid);
413 	} else {
414 		if (event->filename[0] == '/') {
415 			pr_debug2("Failed to read build ID for %s\n",
416 				  event->filename);
417 		}
418 	}
419 	dso__put(dso);
420 }
421 
perf_event__synthesize_mmap_events(const struct perf_tool * tool,union perf_event * event,pid_t pid,pid_t tgid,perf_event__handler_t process,struct machine * machine,bool mmap_data)422 int perf_event__synthesize_mmap_events(const struct perf_tool *tool,
423 				       union perf_event *event,
424 				       pid_t pid, pid_t tgid,
425 				       perf_event__handler_t process,
426 				       struct machine *machine,
427 				       bool mmap_data)
428 {
429 	unsigned long long t;
430 	char bf[BUFSIZ];
431 	struct io io;
432 	bool truncation = false;
433 	unsigned long long timeout = proc_map_timeout * 1000000ULL;
434 	int rc = 0;
435 	const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
436 	int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
437 
438 	if (machine__is_default_guest(machine))
439 		return 0;
440 
441 	snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
442 		machine->root_dir, pid, pid);
443 
444 	io.fd = open(bf, O_RDONLY, 0);
445 	if (io.fd < 0) {
446 		/*
447 		 * We raced with a task exiting - just return:
448 		 */
449 		pr_debug("couldn't open %s\n", bf);
450 		return -1;
451 	}
452 	io__init(&io, io.fd, bf, sizeof(bf));
453 
454 	event->header.type = PERF_RECORD_MMAP2;
455 	t = rdclock();
456 
457 	while (!io.eof) {
458 		static const char anonstr[] = "//anon";
459 		size_t size, aligned_size;
460 
461 		/* ensure null termination since stack will be reused. */
462 		event->mmap2.filename[0] = '\0';
463 
464 		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
465 		if (!read_proc_maps_line(&io,
466 					&event->mmap2.start,
467 					&event->mmap2.len,
468 					&event->mmap2.prot,
469 					&event->mmap2.flags,
470 					&event->mmap2.pgoff,
471 					&event->mmap2.maj,
472 					&event->mmap2.min,
473 					&event->mmap2.ino,
474 					sizeof(event->mmap2.filename),
475 					event->mmap2.filename))
476 			continue;
477 
478 		if ((rdclock() - t) > timeout) {
479 			pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
480 				   "You may want to increase "
481 				   "the time limit by --proc-map-timeout\n",
482 				   machine->root_dir, pid, pid);
483 			truncation = true;
484 			goto out;
485 		}
486 
487 		event->mmap2.ino_generation = 0;
488 
489 		/*
490 		 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
491 		 */
492 		if (machine__is_host(machine))
493 			event->header.misc = PERF_RECORD_MISC_USER;
494 		else
495 			event->header.misc = PERF_RECORD_MISC_GUEST_USER;
496 
497 		if ((event->mmap2.prot & PROT_EXEC) == 0) {
498 			if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
499 				continue;
500 
501 			event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
502 		}
503 
504 out:
505 		if (truncation)
506 			event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
507 
508 		if (!strcmp(event->mmap2.filename, ""))
509 			strcpy(event->mmap2.filename, anonstr);
510 
511 		if (hugetlbfs_mnt_len &&
512 		    !strncmp(event->mmap2.filename, hugetlbfs_mnt,
513 			     hugetlbfs_mnt_len)) {
514 			strcpy(event->mmap2.filename, anonstr);
515 			event->mmap2.flags |= MAP_HUGETLB;
516 		}
517 
518 		size = strlen(event->mmap2.filename) + 1;
519 		aligned_size = PERF_ALIGN(size, sizeof(u64));
520 		event->mmap2.len -= event->mmap.start;
521 		event->mmap2.header.size = (sizeof(event->mmap2) -
522 					(sizeof(event->mmap2.filename) - aligned_size));
523 		memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
524 			(aligned_size - size));
525 		event->mmap2.header.size += machine->id_hdr_size;
526 		event->mmap2.pid = tgid;
527 		event->mmap2.tid = pid;
528 
529 		if (symbol_conf.buildid_mmap2)
530 			perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
531 
532 		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
533 			rc = -1;
534 			break;
535 		}
536 
537 		if (truncation)
538 			break;
539 	}
540 
541 	close(io.fd);
542 	return rc;
543 }
544 
545 #ifdef HAVE_FILE_HANDLE
perf_event__synthesize_cgroup(const struct perf_tool * tool,union perf_event * event,char * path,size_t mount_len,perf_event__handler_t process,struct machine * machine)546 static int perf_event__synthesize_cgroup(const struct perf_tool *tool,
547 					 union perf_event *event,
548 					 char *path, size_t mount_len,
549 					 perf_event__handler_t process,
550 					 struct machine *machine)
551 {
552 	size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
553 	size_t path_len = strlen(path) - mount_len + 1;
554 	struct {
555 		struct file_handle fh;
556 		uint64_t cgroup_id;
557 	} handle;
558 	int mount_id;
559 
560 	while (path_len % sizeof(u64))
561 		path[mount_len + path_len++] = '\0';
562 
563 	memset(&event->cgroup, 0, event_size);
564 
565 	event->cgroup.header.type = PERF_RECORD_CGROUP;
566 	event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
567 
568 	handle.fh.handle_bytes = sizeof(handle.cgroup_id);
569 	if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
570 		pr_debug("stat failed: %s\n", path);
571 		return -1;
572 	}
573 
574 	event->cgroup.id = handle.cgroup_id;
575 	strncpy(event->cgroup.path, path + mount_len, path_len);
576 	memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
577 
578 	if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
579 		pr_debug("process synth event failed\n");
580 		return -1;
581 	}
582 
583 	return 0;
584 }
585 
perf_event__walk_cgroup_tree(const struct perf_tool * tool,union perf_event * event,char * path,size_t mount_len,perf_event__handler_t process,struct machine * machine)586 static int perf_event__walk_cgroup_tree(const struct perf_tool *tool,
587 					union perf_event *event,
588 					char *path, size_t mount_len,
589 					perf_event__handler_t process,
590 					struct machine *machine)
591 {
592 	size_t pos = strlen(path);
593 	DIR *d;
594 	struct dirent *dent;
595 	int ret = 0;
596 
597 	if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
598 					  process, machine) < 0)
599 		return -1;
600 
601 	d = opendir(path);
602 	if (d == NULL) {
603 		pr_debug("failed to open directory: %s\n", path);
604 		return -1;
605 	}
606 
607 	while ((dent = readdir(d)) != NULL) {
608 		if (dent->d_type != DT_DIR)
609 			continue;
610 		if (!strcmp(dent->d_name, ".") ||
611 		    !strcmp(dent->d_name, ".."))
612 			continue;
613 
614 		/* any sane path should be less than PATH_MAX */
615 		if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
616 			continue;
617 
618 		if (path[pos - 1] != '/')
619 			strcat(path, "/");
620 		strcat(path, dent->d_name);
621 
622 		ret = perf_event__walk_cgroup_tree(tool, event, path,
623 						   mount_len, process, machine);
624 		if (ret < 0)
625 			break;
626 
627 		path[pos] = '\0';
628 	}
629 
630 	closedir(d);
631 	return ret;
632 }
633 
perf_event__synthesize_cgroups(const struct perf_tool * tool,perf_event__handler_t process,struct machine * machine)634 int perf_event__synthesize_cgroups(const struct perf_tool *tool,
635 				   perf_event__handler_t process,
636 				   struct machine *machine)
637 {
638 	union perf_event event;
639 	char cgrp_root[PATH_MAX];
640 	size_t mount_len;  /* length of mount point in the path */
641 
642 	if (!tool || !tool->cgroup_events)
643 		return 0;
644 
645 	if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
646 		pr_debug("cannot find cgroup mount point\n");
647 		return -1;
648 	}
649 
650 	mount_len = strlen(cgrp_root);
651 	/* make sure the path starts with a slash (after mount point) */
652 	strcat(cgrp_root, "/");
653 
654 	if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
655 					 process, machine) < 0)
656 		return -1;
657 
658 	return 0;
659 }
660 #else
perf_event__synthesize_cgroups(const struct perf_tool * tool __maybe_unused,perf_event__handler_t process __maybe_unused,struct machine * machine __maybe_unused)661 int perf_event__synthesize_cgroups(const struct perf_tool *tool __maybe_unused,
662 				   perf_event__handler_t process __maybe_unused,
663 				   struct machine *machine __maybe_unused)
664 {
665 	return -1;
666 }
667 #endif
668 
669 struct perf_event__synthesize_modules_maps_cb_args {
670 	const struct perf_tool *tool;
671 	perf_event__handler_t process;
672 	struct machine *machine;
673 	union perf_event *event;
674 };
675 
perf_event__synthesize_modules_maps_cb(struct map * map,void * data)676 static int perf_event__synthesize_modules_maps_cb(struct map *map, void *data)
677 {
678 	struct perf_event__synthesize_modules_maps_cb_args *args = data;
679 	union perf_event *event = args->event;
680 	struct dso *dso;
681 	size_t size;
682 
683 	if (!__map__is_kmodule(map))
684 		return 0;
685 
686 	dso = map__dso(map);
687 	if (symbol_conf.buildid_mmap2) {
688 		size = PERF_ALIGN(dso__long_name_len(dso) + 1, sizeof(u64));
689 		event->mmap2.header.type = PERF_RECORD_MMAP2;
690 		event->mmap2.header.size = (sizeof(event->mmap2) -
691 					(sizeof(event->mmap2.filename) - size));
692 		memset(event->mmap2.filename + size, 0, args->machine->id_hdr_size);
693 		event->mmap2.header.size += args->machine->id_hdr_size;
694 		event->mmap2.start = map__start(map);
695 		event->mmap2.len   = map__size(map);
696 		event->mmap2.pid   = args->machine->pid;
697 
698 		memcpy(event->mmap2.filename, dso__long_name(dso), dso__long_name_len(dso) + 1);
699 
700 		perf_record_mmap2__read_build_id(&event->mmap2, args->machine, false);
701 	} else {
702 		size = PERF_ALIGN(dso__long_name_len(dso) + 1, sizeof(u64));
703 		event->mmap.header.type = PERF_RECORD_MMAP;
704 		event->mmap.header.size = (sizeof(event->mmap) -
705 					(sizeof(event->mmap.filename) - size));
706 		memset(event->mmap.filename + size, 0, args->machine->id_hdr_size);
707 		event->mmap.header.size += args->machine->id_hdr_size;
708 		event->mmap.start = map__start(map);
709 		event->mmap.len   = map__size(map);
710 		event->mmap.pid   = args->machine->pid;
711 
712 		memcpy(event->mmap.filename, dso__long_name(dso), dso__long_name_len(dso) + 1);
713 	}
714 
715 	if (perf_tool__process_synth_event(args->tool, event, args->machine, args->process) != 0)
716 		return -1;
717 
718 	return 0;
719 }
720 
perf_event__synthesize_modules(const struct perf_tool * tool,perf_event__handler_t process,struct machine * machine)721 int perf_event__synthesize_modules(const struct perf_tool *tool, perf_event__handler_t process,
722 				   struct machine *machine)
723 {
724 	int rc;
725 	struct maps *maps = machine__kernel_maps(machine);
726 	struct perf_event__synthesize_modules_maps_cb_args args = {
727 		.tool = tool,
728 		.process = process,
729 		.machine = machine,
730 	};
731 	size_t size = symbol_conf.buildid_mmap2
732 		? sizeof(args.event->mmap2)
733 		: sizeof(args.event->mmap);
734 
735 	args.event = zalloc(size + machine->id_hdr_size);
736 	if (args.event == NULL) {
737 		pr_debug("Not enough memory synthesizing mmap event "
738 			 "for kernel modules\n");
739 		return -1;
740 	}
741 
742 	/*
743 	 * kernel uses 0 for user space maps, see kernel/perf_event.c
744 	 * __perf_event_mmap
745 	 */
746 	if (machine__is_host(machine))
747 		args.event->header.misc = PERF_RECORD_MISC_KERNEL;
748 	else
749 		args.event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
750 
751 	rc = maps__for_each_map(maps, perf_event__synthesize_modules_maps_cb, &args);
752 
753 	free(args.event);
754 	return rc;
755 }
756 
filter_task(const struct dirent * dirent)757 static int filter_task(const struct dirent *dirent)
758 {
759 	return isdigit(dirent->d_name[0]);
760 }
761 
__event__synthesize_thread(union perf_event * comm_event,union perf_event * mmap_event,union perf_event * fork_event,union perf_event * namespaces_event,pid_t pid,int full,perf_event__handler_t process,const struct perf_tool * tool,struct machine * machine,bool needs_mmap,bool mmap_data)762 static int __event__synthesize_thread(union perf_event *comm_event,
763 				      union perf_event *mmap_event,
764 				      union perf_event *fork_event,
765 				      union perf_event *namespaces_event,
766 				      pid_t pid, int full, perf_event__handler_t process,
767 				      const struct perf_tool *tool, struct machine *machine,
768 				      bool needs_mmap, bool mmap_data)
769 {
770 	char filename[PATH_MAX];
771 	struct io_dir iod;
772 	struct io_dirent64 *dent;
773 	pid_t tgid, ppid;
774 	int rc = 0;
775 
776 	/* special case: only send one comm event using passed in pid */
777 	if (!full) {
778 		tgid = perf_event__synthesize_comm(tool, comm_event, pid,
779 						   process, machine);
780 
781 		if (tgid == -1)
782 			return -1;
783 
784 		if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
785 						      tgid, process, machine) < 0)
786 			return -1;
787 
788 		/*
789 		 * send mmap only for thread group leader
790 		 * see thread__init_maps()
791 		 */
792 		if (pid == tgid && needs_mmap &&
793 		    perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
794 						       process, machine, mmap_data))
795 			return -1;
796 
797 		return 0;
798 	}
799 
800 	if (machine__is_default_guest(machine))
801 		return 0;
802 
803 	snprintf(filename, sizeof(filename), "%s/proc/%d/task",
804 		 machine->root_dir, pid);
805 
806 	io_dir__init(&iod, open(filename, O_CLOEXEC | O_DIRECTORY | O_RDONLY));
807 	if (iod.dirfd < 0)
808 		return -1;
809 
810 	while ((dent = io_dir__readdir(&iod)) != NULL) {
811 		char *end;
812 		pid_t _pid;
813 		bool kernel_thread = false;
814 
815 		if (!isdigit(dent->d_name[0]))
816 			continue;
817 
818 		_pid = strtol(dent->d_name, &end, 10);
819 		if (*end)
820 			continue;
821 
822 		/* some threads may exit just after scan, ignore it */
823 		if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
824 					     &tgid, &ppid, &kernel_thread) != 0)
825 			continue;
826 
827 		rc = -1;
828 		if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
829 						ppid, process, machine) < 0)
830 			break;
831 
832 		if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
833 						      tgid, process, machine) < 0)
834 			break;
835 
836 		/*
837 		 * Send the prepared comm event
838 		 */
839 		if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
840 			break;
841 
842 		rc = 0;
843 		if (_pid == pid && !kernel_thread && needs_mmap) {
844 			/* process the parent's maps too */
845 			rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
846 						process, machine, mmap_data);
847 			if (rc)
848 				break;
849 		}
850 	}
851 
852 	close(iod.dirfd);
853 
854 	return rc;
855 }
856 
perf_event__synthesize_thread_map(const struct perf_tool * tool,struct perf_thread_map * threads,perf_event__handler_t process,struct machine * machine,bool needs_mmap,bool mmap_data)857 int perf_event__synthesize_thread_map(const struct perf_tool *tool,
858 				      struct perf_thread_map *threads,
859 				      perf_event__handler_t process,
860 				      struct machine *machine,
861 				      bool needs_mmap, bool mmap_data)
862 {
863 	union perf_event *comm_event, *mmap_event, *fork_event;
864 	union perf_event *namespaces_event;
865 	int err = -1, thread, j;
866 
867 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
868 	if (comm_event == NULL)
869 		goto out;
870 
871 	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
872 	if (mmap_event == NULL)
873 		goto out_free_comm;
874 
875 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
876 	if (fork_event == NULL)
877 		goto out_free_mmap;
878 
879 	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
880 				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
881 				  machine->id_hdr_size);
882 	if (namespaces_event == NULL)
883 		goto out_free_fork;
884 
885 	err = 0;
886 	for (thread = 0; thread < threads->nr; ++thread) {
887 		if (__event__synthesize_thread(comm_event, mmap_event,
888 					       fork_event, namespaces_event,
889 					       perf_thread_map__pid(threads, thread), 0,
890 					       process, tool, machine,
891 					       needs_mmap, mmap_data)) {
892 			err = -1;
893 			break;
894 		}
895 
896 		/*
897 		 * comm.pid is set to thread group id by
898 		 * perf_event__synthesize_comm
899 		 */
900 		if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
901 			bool need_leader = true;
902 
903 			/* is thread group leader in thread_map? */
904 			for (j = 0; j < threads->nr; ++j) {
905 				if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
906 					need_leader = false;
907 					break;
908 				}
909 			}
910 
911 			/* if not, generate events for it */
912 			if (need_leader &&
913 			    __event__synthesize_thread(comm_event, mmap_event,
914 						       fork_event, namespaces_event,
915 						       comm_event->comm.pid, 0,
916 						       process, tool, machine,
917 						       needs_mmap, mmap_data)) {
918 				err = -1;
919 				break;
920 			}
921 		}
922 	}
923 	free(namespaces_event);
924 out_free_fork:
925 	free(fork_event);
926 out_free_mmap:
927 	free(mmap_event);
928 out_free_comm:
929 	free(comm_event);
930 out:
931 	return err;
932 }
933 
__perf_event__synthesize_threads(const struct perf_tool * tool,perf_event__handler_t process,struct machine * machine,bool needs_mmap,bool mmap_data,struct dirent ** dirent,int start,int num)934 static int __perf_event__synthesize_threads(const struct perf_tool *tool,
935 					    perf_event__handler_t process,
936 					    struct machine *machine,
937 					    bool needs_mmap,
938 					    bool mmap_data,
939 					    struct dirent **dirent,
940 					    int start,
941 					    int num)
942 {
943 	union perf_event *comm_event, *mmap_event, *fork_event;
944 	union perf_event *namespaces_event;
945 	int err = -1;
946 	char *end;
947 	pid_t pid;
948 	int i;
949 
950 	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
951 	if (comm_event == NULL)
952 		goto out;
953 
954 	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
955 	if (mmap_event == NULL)
956 		goto out_free_comm;
957 
958 	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
959 	if (fork_event == NULL)
960 		goto out_free_mmap;
961 
962 	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
963 				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
964 				  machine->id_hdr_size);
965 	if (namespaces_event == NULL)
966 		goto out_free_fork;
967 
968 	for (i = start; i < start + num; i++) {
969 		if (!isdigit(dirent[i]->d_name[0]))
970 			continue;
971 
972 		pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
973 		/* only interested in proper numerical dirents */
974 		if (*end)
975 			continue;
976 		/*
977 		 * We may race with exiting thread, so don't stop just because
978 		 * one thread couldn't be synthesized.
979 		 */
980 		__event__synthesize_thread(comm_event, mmap_event, fork_event,
981 					   namespaces_event, pid, 1, process,
982 					   tool, machine, needs_mmap, mmap_data);
983 	}
984 	err = 0;
985 
986 	free(namespaces_event);
987 out_free_fork:
988 	free(fork_event);
989 out_free_mmap:
990 	free(mmap_event);
991 out_free_comm:
992 	free(comm_event);
993 out:
994 	return err;
995 }
996 
997 struct synthesize_threads_arg {
998 	const struct perf_tool *tool;
999 	perf_event__handler_t process;
1000 	struct machine *machine;
1001 	bool needs_mmap;
1002 	bool mmap_data;
1003 	struct dirent **dirent;
1004 	int num;
1005 	int start;
1006 };
1007 
synthesize_threads_worker(void * arg)1008 static void *synthesize_threads_worker(void *arg)
1009 {
1010 	struct synthesize_threads_arg *args = arg;
1011 
1012 	__perf_event__synthesize_threads(args->tool, args->process,
1013 					 args->machine,
1014 					 args->needs_mmap, args->mmap_data,
1015 					 args->dirent,
1016 					 args->start, args->num);
1017 	return NULL;
1018 }
1019 
perf_event__synthesize_threads(const struct perf_tool * tool,perf_event__handler_t process,struct machine * machine,bool needs_mmap,bool mmap_data,unsigned int nr_threads_synthesize)1020 int perf_event__synthesize_threads(const struct perf_tool *tool,
1021 				   perf_event__handler_t process,
1022 				   struct machine *machine,
1023 				   bool needs_mmap, bool mmap_data,
1024 				   unsigned int nr_threads_synthesize)
1025 {
1026 	struct synthesize_threads_arg *args = NULL;
1027 	pthread_t *synthesize_threads = NULL;
1028 	char proc_path[PATH_MAX];
1029 	struct dirent **dirent;
1030 	int num_per_thread;
1031 	int m, n, i, j;
1032 	int thread_nr;
1033 	int base = 0;
1034 	int err = -1;
1035 
1036 
1037 	if (machine__is_default_guest(machine))
1038 		return 0;
1039 
1040 	snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
1041 	n = scandir(proc_path, &dirent, filter_task, NULL);
1042 	if (n < 0)
1043 		return err;
1044 
1045 	if (nr_threads_synthesize == UINT_MAX)
1046 		thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1047 	else
1048 		thread_nr = nr_threads_synthesize;
1049 
1050 	if (thread_nr <= 1) {
1051 		err = __perf_event__synthesize_threads(tool, process,
1052 						       machine,
1053 						       needs_mmap, mmap_data,
1054 						       dirent, base, n);
1055 		goto free_dirent;
1056 	}
1057 	if (thread_nr > n)
1058 		thread_nr = n;
1059 
1060 	synthesize_threads = calloc(thread_nr, sizeof(pthread_t));
1061 	if (synthesize_threads == NULL)
1062 		goto free_dirent;
1063 
1064 	args = calloc(thread_nr, sizeof(*args));
1065 	if (args == NULL)
1066 		goto free_threads;
1067 
1068 	num_per_thread = n / thread_nr;
1069 	m = n % thread_nr;
1070 	for (i = 0; i < thread_nr; i++) {
1071 		args[i].tool = tool;
1072 		args[i].process = process;
1073 		args[i].machine = machine;
1074 		args[i].needs_mmap = needs_mmap;
1075 		args[i].mmap_data = mmap_data;
1076 		args[i].dirent = dirent;
1077 	}
1078 	for (i = 0; i < m; i++) {
1079 		args[i].num = num_per_thread + 1;
1080 		args[i].start = i * args[i].num;
1081 	}
1082 	if (i != 0)
1083 		base = args[i-1].start + args[i-1].num;
1084 	for (j = i; j < thread_nr; j++) {
1085 		args[j].num = num_per_thread;
1086 		args[j].start = base + (j - i) * args[i].num;
1087 	}
1088 
1089 	for (i = 0; i < thread_nr; i++) {
1090 		if (pthread_create(&synthesize_threads[i], NULL,
1091 				   synthesize_threads_worker, &args[i]))
1092 			goto out_join;
1093 	}
1094 	err = 0;
1095 out_join:
1096 	for (i = 0; i < thread_nr; i++)
1097 		pthread_join(synthesize_threads[i], NULL);
1098 	free(args);
1099 free_threads:
1100 	free(synthesize_threads);
1101 free_dirent:
1102 	for (i = 0; i < n; i++)
1103 		zfree(&dirent[i]);
1104 	free(dirent);
1105 
1106 	return err;
1107 }
1108 
perf_event__synthesize_extra_kmaps(const struct perf_tool * tool __maybe_unused,perf_event__handler_t process __maybe_unused,struct machine * machine __maybe_unused)1109 int __weak perf_event__synthesize_extra_kmaps(const struct perf_tool *tool __maybe_unused,
1110 					      perf_event__handler_t process __maybe_unused,
1111 					      struct machine *machine __maybe_unused)
1112 {
1113 	return 0;
1114 }
1115 
__perf_event__synthesize_kernel_mmap(const struct perf_tool * tool,perf_event__handler_t process,struct machine * machine)1116 static int __perf_event__synthesize_kernel_mmap(const struct perf_tool *tool,
1117 						perf_event__handler_t process,
1118 						struct machine *machine)
1119 {
1120 	union perf_event *event;
1121 	size_t size = symbol_conf.buildid_mmap2 ?
1122 			sizeof(event->mmap2) : sizeof(event->mmap);
1123 	struct map *map = machine__kernel_map(machine);
1124 	struct kmap *kmap;
1125 	int err;
1126 
1127 	if (map == NULL)
1128 		return -1;
1129 
1130 	kmap = map__kmap(map);
1131 	if (!kmap->ref_reloc_sym)
1132 		return -1;
1133 
1134 	/*
1135 	 * We should get this from /sys/kernel/sections/.text, but till that is
1136 	 * available use this, and after it is use this as a fallback for older
1137 	 * kernels.
1138 	 */
1139 	event = zalloc(size + machine->id_hdr_size);
1140 	if (event == NULL) {
1141 		pr_debug("Not enough memory synthesizing mmap event "
1142 			 "for kernel modules\n");
1143 		return -1;
1144 	}
1145 
1146 	if (machine__is_host(machine)) {
1147 		/*
1148 		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
1149 		 * see kernel/perf_event.c __perf_event_mmap
1150 		 */
1151 		event->header.misc = PERF_RECORD_MISC_KERNEL;
1152 	} else {
1153 		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1154 	}
1155 
1156 	if (symbol_conf.buildid_mmap2) {
1157 		size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1158 				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1159 		size = PERF_ALIGN(size, sizeof(u64));
1160 		event->mmap2.header.type = PERF_RECORD_MMAP2;
1161 		event->mmap2.header.size = (sizeof(event->mmap2) -
1162 				(sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1163 		event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1164 		event->mmap2.start = map__start(map);
1165 		event->mmap2.len   = map__end(map) - event->mmap.start;
1166 		event->mmap2.pid   = machine->pid;
1167 
1168 		perf_record_mmap2__read_build_id(&event->mmap2, machine, true);
1169 	} else {
1170 		size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1171 				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1172 		size = PERF_ALIGN(size, sizeof(u64));
1173 		event->mmap.header.type = PERF_RECORD_MMAP;
1174 		event->mmap.header.size = (sizeof(event->mmap) -
1175 				(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1176 		event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1177 		event->mmap.start = map__start(map);
1178 		event->mmap.len   = map__end(map) - event->mmap.start;
1179 		event->mmap.pid   = machine->pid;
1180 	}
1181 
1182 	err = perf_tool__process_synth_event(tool, event, machine, process);
1183 	free(event);
1184 
1185 	return err;
1186 }
1187 
perf_event__synthesize_kernel_mmap(const struct perf_tool * tool,perf_event__handler_t process,struct machine * machine)1188 int perf_event__synthesize_kernel_mmap(const struct perf_tool *tool,
1189 				       perf_event__handler_t process,
1190 				       struct machine *machine)
1191 {
1192 	int err;
1193 
1194 	err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1195 	if (err < 0)
1196 		return err;
1197 
1198 	return perf_event__synthesize_extra_kmaps(tool, process, machine);
1199 }
1200 
perf_event__synthesize_thread_map2(const struct perf_tool * tool,struct perf_thread_map * threads,perf_event__handler_t process,struct machine * machine)1201 int perf_event__synthesize_thread_map2(const struct perf_tool *tool,
1202 				      struct perf_thread_map *threads,
1203 				      perf_event__handler_t process,
1204 				      struct machine *machine)
1205 {
1206 	union perf_event *event;
1207 	int i, err, size;
1208 
1209 	size  = sizeof(event->thread_map);
1210 	size +=	threads->nr * sizeof(event->thread_map.entries[0]);
1211 
1212 	event = zalloc(size);
1213 	if (!event)
1214 		return -ENOMEM;
1215 
1216 	event->header.type = PERF_RECORD_THREAD_MAP;
1217 	event->header.size = size;
1218 	event->thread_map.nr = threads->nr;
1219 
1220 	for (i = 0; i < threads->nr; i++) {
1221 		struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1222 		char *comm = perf_thread_map__comm(threads, i);
1223 
1224 		if (!comm)
1225 			comm = (char *) "";
1226 
1227 		entry->pid = perf_thread_map__pid(threads, i);
1228 		strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1229 	}
1230 
1231 	err = process(tool, event, NULL, machine);
1232 
1233 	free(event);
1234 	return err;
1235 }
1236 
1237 struct synthesize_cpu_map_data {
1238 	const struct perf_cpu_map *map;
1239 	int nr;
1240 	int min_cpu;
1241 	int max_cpu;
1242 	int has_any_cpu;
1243 	int type;
1244 	size_t size;
1245 	struct perf_record_cpu_map_data *data;
1246 };
1247 
synthesize_cpus(struct synthesize_cpu_map_data * data)1248 static void synthesize_cpus(struct synthesize_cpu_map_data *data)
1249 {
1250 	data->data->type = PERF_CPU_MAP__CPUS;
1251 	data->data->cpus_data.nr = data->nr;
1252 	for (int i = 0; i < data->nr; i++)
1253 		data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
1254 }
1255 
synthesize_mask(struct synthesize_cpu_map_data * data)1256 static void synthesize_mask(struct synthesize_cpu_map_data *data)
1257 {
1258 	int idx;
1259 	struct perf_cpu cpu;
1260 
1261 	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1262 	data->data->type = PERF_CPU_MAP__MASK;
1263 	data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
1264 	data->data->mask32_data.long_size = 4;
1265 
1266 	perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
1267 		int bit_word = cpu.cpu / 32;
1268 		u32 bit_mask = 1U << (cpu.cpu & 31);
1269 
1270 		data->data->mask32_data.mask[bit_word] |= bit_mask;
1271 	}
1272 }
1273 
synthesize_range_cpus(struct synthesize_cpu_map_data * data)1274 static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
1275 {
1276 	data->data->type = PERF_CPU_MAP__RANGE_CPUS;
1277 	data->data->range_cpu_data.any_cpu = data->has_any_cpu;
1278 	data->data->range_cpu_data.start_cpu = data->min_cpu;
1279 	data->data->range_cpu_data.end_cpu = data->max_cpu;
1280 }
1281 
cpu_map_data__alloc(struct synthesize_cpu_map_data * syn_data,size_t header_size)1282 static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
1283 				 size_t header_size)
1284 {
1285 	size_t size_cpus, size_mask;
1286 
1287 	syn_data->nr = perf_cpu_map__nr(syn_data->map);
1288 	syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
1289 
1290 	syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
1291 	syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
1292 	if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
1293 		/* A consecutive range of CPUs can be encoded using a range. */
1294 		assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
1295 		syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
1296 		syn_data->size = header_size + sizeof(u64);
1297 		return zalloc(syn_data->size);
1298 	}
1299 
1300 	size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
1301 	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1302 	size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
1303 		BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
1304 	if (syn_data->has_any_cpu || size_cpus < size_mask) {
1305 		/* Follow the CPU map encoding. */
1306 		syn_data->type = PERF_CPU_MAP__CPUS;
1307 		syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
1308 		return zalloc(syn_data->size);
1309 	}
1310 	/* Encode using a bitmask. */
1311 	syn_data->type = PERF_CPU_MAP__MASK;
1312 	syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
1313 	return zalloc(syn_data->size);
1314 }
1315 
cpu_map_data__synthesize(struct synthesize_cpu_map_data * data)1316 static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
1317 {
1318 	switch (data->type) {
1319 	case PERF_CPU_MAP__CPUS:
1320 		synthesize_cpus(data);
1321 		break;
1322 	case PERF_CPU_MAP__MASK:
1323 		synthesize_mask(data);
1324 		break;
1325 	case PERF_CPU_MAP__RANGE_CPUS:
1326 		synthesize_range_cpus(data);
1327 		break;
1328 	default:
1329 		break;
1330 	}
1331 }
1332 
cpu_map_event__new(const struct perf_cpu_map * map)1333 static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1334 {
1335 	struct synthesize_cpu_map_data syn_data = { .map = map };
1336 	struct perf_record_cpu_map *event;
1337 
1338 
1339 	event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header));
1340 	if (!event)
1341 		return NULL;
1342 
1343 	syn_data.data = &event->data;
1344 	event->header.type = PERF_RECORD_CPU_MAP;
1345 	event->header.size = syn_data.size;
1346 	cpu_map_data__synthesize(&syn_data);
1347 	return event;
1348 }
1349 
1350 
perf_event__synthesize_cpu_map(const struct perf_tool * tool,const struct perf_cpu_map * map,perf_event__handler_t process,struct machine * machine)1351 int perf_event__synthesize_cpu_map(const struct perf_tool *tool,
1352 				   const struct perf_cpu_map *map,
1353 				   perf_event__handler_t process,
1354 				   struct machine *machine)
1355 {
1356 	struct perf_record_cpu_map *event;
1357 	int err;
1358 
1359 	event = cpu_map_event__new(map);
1360 	if (!event)
1361 		return -ENOMEM;
1362 
1363 	err = process(tool, (union perf_event *) event, NULL, machine);
1364 
1365 	free(event);
1366 	return err;
1367 }
1368 
perf_event__synthesize_stat_config(const struct perf_tool * tool,struct perf_stat_config * config,perf_event__handler_t process,struct machine * machine)1369 int perf_event__synthesize_stat_config(const struct perf_tool *tool,
1370 				       struct perf_stat_config *config,
1371 				       perf_event__handler_t process,
1372 				       struct machine *machine)
1373 {
1374 	struct perf_record_stat_config *event;
1375 	int size, i = 0, err;
1376 
1377 	size  = sizeof(*event);
1378 	size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1379 
1380 	event = zalloc(size);
1381 	if (!event)
1382 		return -ENOMEM;
1383 
1384 	event->header.type = PERF_RECORD_STAT_CONFIG;
1385 	event->header.size = size;
1386 	event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1387 
1388 #define ADD(__term, __val)					\
1389 	event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;	\
1390 	event->data[i].val = __val;				\
1391 	i++;
1392 
1393 	ADD(AGGR_MODE,	config->aggr_mode)
1394 	ADD(INTERVAL,	config->interval)
1395 	ADD(SCALE,	config->scale)
1396 	ADD(AGGR_LEVEL,	config->aggr_level)
1397 
1398 	WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1399 		  "stat config terms unbalanced\n");
1400 #undef ADD
1401 
1402 	err = process(tool, (union perf_event *) event, NULL, machine);
1403 
1404 	free(event);
1405 	return err;
1406 }
1407 
perf_event__synthesize_stat(const struct perf_tool * tool,struct perf_cpu cpu,u32 thread,u64 id,struct perf_counts_values * count,perf_event__handler_t process,struct machine * machine)1408 int perf_event__synthesize_stat(const struct perf_tool *tool,
1409 				struct perf_cpu cpu, u32 thread, u64 id,
1410 				struct perf_counts_values *count,
1411 				perf_event__handler_t process,
1412 				struct machine *machine)
1413 {
1414 	struct perf_record_stat event;
1415 
1416 	event.header.type = PERF_RECORD_STAT;
1417 	event.header.size = sizeof(event);
1418 	event.header.misc = 0;
1419 
1420 	event.id        = id;
1421 	event.cpu       = cpu.cpu;
1422 	event.thread    = thread;
1423 	event.val       = count->val;
1424 	event.ena       = count->ena;
1425 	event.run       = count->run;
1426 
1427 	return process(tool, (union perf_event *) &event, NULL, machine);
1428 }
1429 
perf_event__synthesize_stat_round(const struct perf_tool * tool,u64 evtime,u64 type,perf_event__handler_t process,struct machine * machine)1430 int perf_event__synthesize_stat_round(const struct perf_tool *tool,
1431 				      u64 evtime, u64 type,
1432 				      perf_event__handler_t process,
1433 				      struct machine *machine)
1434 {
1435 	struct perf_record_stat_round event;
1436 
1437 	event.header.type = PERF_RECORD_STAT_ROUND;
1438 	event.header.size = sizeof(event);
1439 	event.header.misc = 0;
1440 
1441 	event.time = evtime;
1442 	event.type = type;
1443 
1444 	return process(tool, (union perf_event *) &event, NULL, machine);
1445 }
1446 
perf_event__sample_event_size(const struct perf_sample * sample,u64 type,u64 read_format)1447 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1448 {
1449 	size_t sz, result = sizeof(struct perf_record_sample);
1450 
1451 	if (type & PERF_SAMPLE_IDENTIFIER)
1452 		result += sizeof(u64);
1453 
1454 	if (type & PERF_SAMPLE_IP)
1455 		result += sizeof(u64);
1456 
1457 	if (type & PERF_SAMPLE_TID)
1458 		result += sizeof(u64);
1459 
1460 	if (type & PERF_SAMPLE_TIME)
1461 		result += sizeof(u64);
1462 
1463 	if (type & PERF_SAMPLE_ADDR)
1464 		result += sizeof(u64);
1465 
1466 	if (type & PERF_SAMPLE_ID)
1467 		result += sizeof(u64);
1468 
1469 	if (type & PERF_SAMPLE_STREAM_ID)
1470 		result += sizeof(u64);
1471 
1472 	if (type & PERF_SAMPLE_CPU)
1473 		result += sizeof(u64);
1474 
1475 	if (type & PERF_SAMPLE_PERIOD)
1476 		result += sizeof(u64);
1477 
1478 	if (type & PERF_SAMPLE_READ) {
1479 		result += sizeof(u64);
1480 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1481 			result += sizeof(u64);
1482 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1483 			result += sizeof(u64);
1484 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1485 		if (read_format & PERF_FORMAT_GROUP) {
1486 			sz = sample_read_value_size(read_format);
1487 			result += sz * sample->read.group.nr;
1488 		} else {
1489 			result += sizeof(u64);
1490 			if (read_format & PERF_FORMAT_LOST)
1491 				result += sizeof(u64);
1492 		}
1493 	}
1494 
1495 	if (type & PERF_SAMPLE_CALLCHAIN) {
1496 		sz = (sample->callchain->nr + 1) * sizeof(u64);
1497 		result += sz;
1498 	}
1499 
1500 	if (type & PERF_SAMPLE_RAW) {
1501 		result += sizeof(u32);
1502 		result += sample->raw_size;
1503 	}
1504 
1505 	if (type & PERF_SAMPLE_BRANCH_STACK) {
1506 		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1507 		/* nr, hw_idx */
1508 		sz += 2 * sizeof(u64);
1509 		result += sz;
1510 	}
1511 
1512 	if (type & PERF_SAMPLE_REGS_USER) {
1513 		if (sample->user_regs && sample->user_regs->abi) {
1514 			result += sizeof(u64);
1515 			sz = hweight64(sample->user_regs->mask) * sizeof(u64);
1516 			result += sz;
1517 		} else {
1518 			result += sizeof(u64);
1519 		}
1520 	}
1521 
1522 	if (type & PERF_SAMPLE_STACK_USER) {
1523 		sz = sample->user_stack.size;
1524 		result += sizeof(u64);
1525 		if (sz) {
1526 			result += sz;
1527 			result += sizeof(u64);
1528 		}
1529 	}
1530 
1531 	if (type & PERF_SAMPLE_WEIGHT_TYPE)
1532 		result += sizeof(u64);
1533 
1534 	if (type & PERF_SAMPLE_DATA_SRC)
1535 		result += sizeof(u64);
1536 
1537 	if (type & PERF_SAMPLE_TRANSACTION)
1538 		result += sizeof(u64);
1539 
1540 	if (type & PERF_SAMPLE_REGS_INTR) {
1541 		if (sample->intr_regs && sample->intr_regs->abi) {
1542 			result += sizeof(u64);
1543 			sz = hweight64(sample->intr_regs->mask) * sizeof(u64);
1544 			result += sz;
1545 		} else {
1546 			result += sizeof(u64);
1547 		}
1548 	}
1549 
1550 	if (type & PERF_SAMPLE_PHYS_ADDR)
1551 		result += sizeof(u64);
1552 
1553 	if (type & PERF_SAMPLE_CGROUP)
1554 		result += sizeof(u64);
1555 
1556 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1557 		result += sizeof(u64);
1558 
1559 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1560 		result += sizeof(u64);
1561 
1562 	if (type & PERF_SAMPLE_AUX) {
1563 		result += sizeof(u64);
1564 		result += sample->aux_sample.size;
1565 	}
1566 
1567 	return result;
1568 }
1569 
arch_perf_synthesize_sample_weight(const struct perf_sample * data,__u64 * array,u64 type __maybe_unused)1570 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1571 					       __u64 *array, u64 type __maybe_unused)
1572 {
1573 	*array = data->weight;
1574 }
1575 
copy_read_group_values(__u64 * array,__u64 read_format,const struct perf_sample * sample)1576 static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1577 				     const struct perf_sample *sample)
1578 {
1579 	size_t sz = sample_read_value_size(read_format);
1580 	struct sample_read_value *v = sample->read.group.values;
1581 
1582 	sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1583 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1584 		memcpy(array, v, sz);
1585 		array = (void *)array + sz;
1586 	}
1587 	return array;
1588 }
1589 
perf_event__synthesize_sample(union perf_event * event,u64 type,u64 read_format,const struct perf_sample * sample)1590 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1591 				  const struct perf_sample *sample)
1592 {
1593 	__u64 *array;
1594 	size_t sz;
1595 	/*
1596 	 * used for cross-endian analysis. See git commit 65014ab3
1597 	 * for why this goofiness is needed.
1598 	 */
1599 	union u64_swap u;
1600 
1601 	array = event->sample.array;
1602 
1603 	if (type & PERF_SAMPLE_IDENTIFIER) {
1604 		*array = sample->id;
1605 		array++;
1606 	}
1607 
1608 	if (type & PERF_SAMPLE_IP) {
1609 		*array = sample->ip;
1610 		array++;
1611 	}
1612 
1613 	if (type & PERF_SAMPLE_TID) {
1614 		u.val32[0] = sample->pid;
1615 		u.val32[1] = sample->tid;
1616 		*array = u.val64;
1617 		array++;
1618 	}
1619 
1620 	if (type & PERF_SAMPLE_TIME) {
1621 		*array = sample->time;
1622 		array++;
1623 	}
1624 
1625 	if (type & PERF_SAMPLE_ADDR) {
1626 		*array = sample->addr;
1627 		array++;
1628 	}
1629 
1630 	if (type & PERF_SAMPLE_ID) {
1631 		*array = sample->id;
1632 		array++;
1633 	}
1634 
1635 	if (type & PERF_SAMPLE_STREAM_ID) {
1636 		*array = sample->stream_id;
1637 		array++;
1638 	}
1639 
1640 	if (type & PERF_SAMPLE_CPU) {
1641 		u.val32[0] = sample->cpu;
1642 		u.val32[1] = 0;
1643 		*array = u.val64;
1644 		array++;
1645 	}
1646 
1647 	if (type & PERF_SAMPLE_PERIOD) {
1648 		*array = sample->period;
1649 		array++;
1650 	}
1651 
1652 	if (type & PERF_SAMPLE_READ) {
1653 		if (read_format & PERF_FORMAT_GROUP)
1654 			*array = sample->read.group.nr;
1655 		else
1656 			*array = sample->read.one.value;
1657 		array++;
1658 
1659 		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1660 			*array = sample->read.time_enabled;
1661 			array++;
1662 		}
1663 
1664 		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1665 			*array = sample->read.time_running;
1666 			array++;
1667 		}
1668 
1669 		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1670 		if (read_format & PERF_FORMAT_GROUP) {
1671 			array = copy_read_group_values(array, read_format,
1672 						       sample);
1673 		} else {
1674 			*array = sample->read.one.id;
1675 			array++;
1676 
1677 			if (read_format & PERF_FORMAT_LOST) {
1678 				*array = sample->read.one.lost;
1679 				array++;
1680 			}
1681 		}
1682 	}
1683 
1684 	if (type & PERF_SAMPLE_CALLCHAIN) {
1685 		sz = (sample->callchain->nr + 1) * sizeof(u64);
1686 		memcpy(array, sample->callchain, sz);
1687 		array = (void *)array + sz;
1688 	}
1689 
1690 	if (type & PERF_SAMPLE_RAW) {
1691 		u32 *array32 = (void *)array;
1692 
1693 		*array32 = sample->raw_size;
1694 		array32++;
1695 
1696 		memcpy(array32, sample->raw_data, sample->raw_size);
1697 		array = (void *)(array32 + (sample->raw_size / sizeof(u32)));
1698 
1699 		/* make sure the array is 64-bit aligned */
1700 		BUG_ON(((long)array) % sizeof(u64));
1701 	}
1702 
1703 	if (type & PERF_SAMPLE_BRANCH_STACK) {
1704 		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1705 		/* nr, hw_idx */
1706 		sz += 2 * sizeof(u64);
1707 		memcpy(array, sample->branch_stack, sz);
1708 		array = (void *)array + sz;
1709 	}
1710 
1711 	if (type & PERF_SAMPLE_REGS_USER) {
1712 		if (sample->user_regs && sample->user_regs->abi) {
1713 			*array++ = sample->user_regs->abi;
1714 			sz = hweight64(sample->user_regs->mask) * sizeof(u64);
1715 			memcpy(array, sample->user_regs->regs, sz);
1716 			array = (void *)array + sz;
1717 		} else {
1718 			*array++ = 0;
1719 		}
1720 	}
1721 
1722 	if (type & PERF_SAMPLE_STACK_USER) {
1723 		sz = sample->user_stack.size;
1724 		*array++ = sz;
1725 		if (sz) {
1726 			memcpy(array, sample->user_stack.data, sz);
1727 			array = (void *)array + sz;
1728 			*array++ = sz;
1729 		}
1730 	}
1731 
1732 	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1733 		arch_perf_synthesize_sample_weight(sample, array, type);
1734 		array++;
1735 	}
1736 
1737 	if (type & PERF_SAMPLE_DATA_SRC) {
1738 		*array = sample->data_src;
1739 		array++;
1740 	}
1741 
1742 	if (type & PERF_SAMPLE_TRANSACTION) {
1743 		*array = sample->transaction;
1744 		array++;
1745 	}
1746 
1747 	if (type & PERF_SAMPLE_REGS_INTR) {
1748 		if (sample->intr_regs && sample->intr_regs->abi) {
1749 			*array++ = sample->intr_regs->abi;
1750 			sz = hweight64(sample->intr_regs->mask) * sizeof(u64);
1751 			memcpy(array, sample->intr_regs->regs, sz);
1752 			array = (void *)array + sz;
1753 		} else {
1754 			*array++ = 0;
1755 		}
1756 	}
1757 
1758 	if (type & PERF_SAMPLE_PHYS_ADDR) {
1759 		*array = sample->phys_addr;
1760 		array++;
1761 	}
1762 
1763 	if (type & PERF_SAMPLE_CGROUP) {
1764 		*array = sample->cgroup;
1765 		array++;
1766 	}
1767 
1768 	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1769 		*array = sample->data_page_size;
1770 		array++;
1771 	}
1772 
1773 	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1774 		*array = sample->code_page_size;
1775 		array++;
1776 	}
1777 
1778 	if (type & PERF_SAMPLE_AUX) {
1779 		sz = sample->aux_sample.size;
1780 		*array++ = sz;
1781 		memcpy(array, sample->aux_sample.data, sz);
1782 		array = (void *)array + sz;
1783 	}
1784 
1785 	return 0;
1786 }
1787 
perf_event__synthesize_id_sample(__u64 * array,u64 type,const struct perf_sample * sample)1788 int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1789 {
1790 	__u64 *start = array;
1791 
1792 	/*
1793 	 * used for cross-endian analysis. See git commit 65014ab3
1794 	 * for why this goofiness is needed.
1795 	 */
1796 	union u64_swap u;
1797 
1798 	if (type & PERF_SAMPLE_TID) {
1799 		u.val32[0] = sample->pid;
1800 		u.val32[1] = sample->tid;
1801 		*array = u.val64;
1802 		array++;
1803 	}
1804 
1805 	if (type & PERF_SAMPLE_TIME) {
1806 		*array = sample->time;
1807 		array++;
1808 	}
1809 
1810 	if (type & PERF_SAMPLE_ID) {
1811 		*array = sample->id;
1812 		array++;
1813 	}
1814 
1815 	if (type & PERF_SAMPLE_STREAM_ID) {
1816 		*array = sample->stream_id;
1817 		array++;
1818 	}
1819 
1820 	if (type & PERF_SAMPLE_CPU) {
1821 		u.val32[0] = sample->cpu;
1822 		u.val32[1] = 0;
1823 		*array = u.val64;
1824 		array++;
1825 	}
1826 
1827 	if (type & PERF_SAMPLE_IDENTIFIER) {
1828 		*array = sample->id;
1829 		array++;
1830 	}
1831 
1832 	return (void *)array - (void *)start;
1833 }
1834 
__perf_event__synthesize_id_index(const struct perf_tool * tool,perf_event__handler_t process,struct evlist * evlist,struct machine * machine,size_t from)1835 int __perf_event__synthesize_id_index(const struct perf_tool *tool, perf_event__handler_t process,
1836 				      struct evlist *evlist, struct machine *machine, size_t from)
1837 {
1838 	union perf_event *ev;
1839 	struct evsel *evsel;
1840 	size_t nr = 0, i = 0, sz, max_nr, n, pos;
1841 	size_t e1_sz = sizeof(struct id_index_entry);
1842 	size_t e2_sz = sizeof(struct id_index_entry_2);
1843 	size_t etot_sz = e1_sz + e2_sz;
1844 	bool e2_needed = false;
1845 	int err;
1846 
1847 	max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1848 
1849 	pos = 0;
1850 	evlist__for_each_entry(evlist, evsel) {
1851 		if (pos++ < from)
1852 			continue;
1853 		nr += evsel->core.ids;
1854 	}
1855 
1856 	if (!nr)
1857 		return 0;
1858 
1859 	pr_debug2("Synthesizing id index\n");
1860 
1861 	n = nr > max_nr ? max_nr : nr;
1862 	sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1863 	ev = zalloc(sz);
1864 	if (!ev)
1865 		return -ENOMEM;
1866 
1867 	sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1868 
1869 	ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1870 	ev->id_index.nr = n;
1871 
1872 	pos = 0;
1873 	evlist__for_each_entry(evlist, evsel) {
1874 		u32 j;
1875 
1876 		if (pos++ < from)
1877 			continue;
1878 		for (j = 0; j < evsel->core.ids; j++, i++) {
1879 			struct id_index_entry *e;
1880 			struct id_index_entry_2 *e2;
1881 			struct perf_sample_id *sid;
1882 
1883 			if (i >= n) {
1884 				ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1885 				err = process(tool, ev, NULL, machine);
1886 				if (err)
1887 					goto out_err;
1888 				nr -= n;
1889 				i = 0;
1890 				e2_needed = false;
1891 			}
1892 
1893 			e = &ev->id_index.entries[i];
1894 
1895 			e->id = evsel->core.id[j];
1896 
1897 			sid = evlist__id2sid(evlist, e->id);
1898 			if (!sid) {
1899 				free(ev);
1900 				return -ENOENT;
1901 			}
1902 
1903 			e->idx = sid->idx;
1904 			e->cpu = sid->cpu.cpu;
1905 			e->tid = sid->tid;
1906 
1907 			if (sid->machine_pid)
1908 				e2_needed = true;
1909 
1910 			e2 = (void *)ev + sz;
1911 			e2[i].machine_pid = sid->machine_pid;
1912 			e2[i].vcpu        = sid->vcpu.cpu;
1913 		}
1914 	}
1915 
1916 	sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1917 	ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1918 	ev->id_index.nr = nr;
1919 
1920 	err = process(tool, ev, NULL, machine);
1921 out_err:
1922 	free(ev);
1923 
1924 	return err;
1925 }
1926 
perf_event__synthesize_id_index(const struct perf_tool * tool,perf_event__handler_t process,struct evlist * evlist,struct machine * machine)1927 int perf_event__synthesize_id_index(const struct perf_tool *tool, perf_event__handler_t process,
1928 				    struct evlist *evlist, struct machine *machine)
1929 {
1930 	return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1931 }
1932 
__machine__synthesize_threads(struct machine * machine,const struct perf_tool * tool,struct target * target,struct perf_thread_map * threads,perf_event__handler_t process,bool needs_mmap,bool data_mmap,unsigned int nr_threads_synthesize)1933 int __machine__synthesize_threads(struct machine *machine, const struct perf_tool *tool,
1934 				  struct target *target, struct perf_thread_map *threads,
1935 				  perf_event__handler_t process, bool needs_mmap,
1936 				  bool data_mmap, unsigned int nr_threads_synthesize)
1937 {
1938 	/*
1939 	 * When perf runs in non-root PID namespace, and the namespace's proc FS
1940 	 * is not mounted, nsinfo__is_in_root_namespace() returns false.
1941 	 * In this case, the proc FS is coming for the parent namespace, thus
1942 	 * perf tool will wrongly gather process info from its parent PID
1943 	 * namespace.
1944 	 *
1945 	 * To avoid the confusion that the perf tool runs in a child PID
1946 	 * namespace but it synthesizes thread info from its parent PID
1947 	 * namespace, returns failure with warning.
1948 	 */
1949 	if (!nsinfo__is_in_root_namespace()) {
1950 		pr_err("Perf runs in non-root PID namespace but it tries to ");
1951 		pr_err("gather process info from its parent PID namespace.\n");
1952 		pr_err("Please mount the proc file system properly, e.g. ");
1953 		pr_err("add the option '--mount-proc' for unshare command.\n");
1954 		return -EPERM;
1955 	}
1956 
1957 	if (target__has_task(target))
1958 		return perf_event__synthesize_thread_map(tool, threads, process, machine,
1959 							 needs_mmap, data_mmap);
1960 	else if (target__has_cpu(target))
1961 		return perf_event__synthesize_threads(tool, process, machine,
1962 						      needs_mmap, data_mmap,
1963 						      nr_threads_synthesize);
1964 	/* command specified */
1965 	return 0;
1966 }
1967 
machine__synthesize_threads(struct machine * machine,struct target * target,struct perf_thread_map * threads,bool needs_mmap,bool data_mmap,unsigned int nr_threads_synthesize)1968 int machine__synthesize_threads(struct machine *machine, struct target *target,
1969 				struct perf_thread_map *threads, bool needs_mmap,
1970 				bool data_mmap, unsigned int nr_threads_synthesize)
1971 {
1972 	return __machine__synthesize_threads(machine, NULL, target, threads,
1973 					     perf_event__process, needs_mmap,
1974 					     data_mmap, nr_threads_synthesize);
1975 }
1976 
event_update_event__new(size_t size,u64 type,u64 id)1977 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1978 {
1979 	struct perf_record_event_update *ev;
1980 
1981 	size += sizeof(*ev);
1982 	size  = PERF_ALIGN(size, sizeof(u64));
1983 
1984 	ev = zalloc(size);
1985 	if (ev) {
1986 		ev->header.type = PERF_RECORD_EVENT_UPDATE;
1987 		ev->header.size = (u16)size;
1988 		ev->type	= type;
1989 		ev->id		= id;
1990 	}
1991 	return ev;
1992 }
1993 
perf_event__synthesize_event_update_unit(const struct perf_tool * tool,struct evsel * evsel,perf_event__handler_t process)1994 int perf_event__synthesize_event_update_unit(const struct perf_tool *tool, struct evsel *evsel,
1995 					     perf_event__handler_t process)
1996 {
1997 	size_t size = strlen(evsel->unit);
1998 	struct perf_record_event_update *ev;
1999 	int err;
2000 
2001 	ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
2002 	if (ev == NULL)
2003 		return -ENOMEM;
2004 
2005 	strlcpy(ev->unit, evsel->unit, size + 1);
2006 	err = process(tool, (union perf_event *)ev, NULL, NULL);
2007 	free(ev);
2008 	return err;
2009 }
2010 
perf_event__synthesize_event_update_scale(const struct perf_tool * tool,struct evsel * evsel,perf_event__handler_t process)2011 int perf_event__synthesize_event_update_scale(const struct perf_tool *tool, struct evsel *evsel,
2012 					      perf_event__handler_t process)
2013 {
2014 	struct perf_record_event_update *ev;
2015 	struct perf_record_event_update_scale *ev_data;
2016 	int err;
2017 
2018 	ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
2019 	if (ev == NULL)
2020 		return -ENOMEM;
2021 
2022 	ev->scale.scale = evsel->scale;
2023 	err = process(tool, (union perf_event *)ev, NULL, NULL);
2024 	free(ev);
2025 	return err;
2026 }
2027 
perf_event__synthesize_event_update_name(const struct perf_tool * tool,struct evsel * evsel,perf_event__handler_t process)2028 int perf_event__synthesize_event_update_name(const struct perf_tool *tool, struct evsel *evsel,
2029 					     perf_event__handler_t process)
2030 {
2031 	struct perf_record_event_update *ev;
2032 	size_t len = strlen(evsel__name(evsel));
2033 	int err;
2034 
2035 	ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
2036 	if (ev == NULL)
2037 		return -ENOMEM;
2038 
2039 	strlcpy(ev->name, evsel->name, len + 1);
2040 	err = process(tool, (union perf_event *)ev, NULL, NULL);
2041 	free(ev);
2042 	return err;
2043 }
2044 
perf_event__synthesize_event_update_cpus(const struct perf_tool * tool,struct evsel * evsel,perf_event__handler_t process)2045 int perf_event__synthesize_event_update_cpus(const struct perf_tool *tool, struct evsel *evsel,
2046 					     perf_event__handler_t process)
2047 {
2048 	struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
2049 	struct perf_record_event_update *ev;
2050 	int err;
2051 
2052 	ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64));
2053 	if (!ev)
2054 		return -ENOMEM;
2055 
2056 	syn_data.data = &ev->cpus.cpus;
2057 	ev->header.type = PERF_RECORD_EVENT_UPDATE;
2058 	ev->header.size = (u16)syn_data.size;
2059 	ev->type	= PERF_EVENT_UPDATE__CPUS;
2060 	ev->id		= evsel->core.id[0];
2061 	cpu_map_data__synthesize(&syn_data);
2062 
2063 	err = process(tool, (union perf_event *)ev, NULL, NULL);
2064 	free(ev);
2065 	return err;
2066 }
2067 
perf_event__synthesize_attrs(const struct perf_tool * tool,struct evlist * evlist,perf_event__handler_t process)2068 int perf_event__synthesize_attrs(const struct perf_tool *tool, struct evlist *evlist,
2069 				 perf_event__handler_t process)
2070 {
2071 	struct evsel *evsel;
2072 	int err = 0;
2073 
2074 	evlist__for_each_entry(evlist, evsel) {
2075 		err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2076 						  evsel->core.id, process);
2077 		if (err) {
2078 			pr_debug("failed to create perf header attribute\n");
2079 			return err;
2080 		}
2081 	}
2082 
2083 	return err;
2084 }
2085 
has_unit(struct evsel * evsel)2086 static bool has_unit(struct evsel *evsel)
2087 {
2088 	return evsel->unit && *evsel->unit;
2089 }
2090 
has_scale(struct evsel * evsel)2091 static bool has_scale(struct evsel *evsel)
2092 {
2093 	return evsel->scale != 1;
2094 }
2095 
perf_event__synthesize_extra_attr(const struct perf_tool * tool,struct evlist * evsel_list,perf_event__handler_t process,bool is_pipe)2096 int perf_event__synthesize_extra_attr(const struct perf_tool *tool, struct evlist *evsel_list,
2097 				      perf_event__handler_t process, bool is_pipe)
2098 {
2099 	struct evsel *evsel;
2100 	int err;
2101 
2102 	/*
2103 	 * Synthesize other events stuff not carried within
2104 	 * attr event - unit, scale, name
2105 	 */
2106 	evlist__for_each_entry(evsel_list, evsel) {
2107 		if (!evsel->supported)
2108 			continue;
2109 
2110 		/*
2111 		 * Synthesize unit and scale only if it's defined.
2112 		 */
2113 		if (has_unit(evsel)) {
2114 			err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2115 			if (err < 0) {
2116 				pr_err("Couldn't synthesize evsel unit.\n");
2117 				return err;
2118 			}
2119 		}
2120 
2121 		if (has_scale(evsel)) {
2122 			err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2123 			if (err < 0) {
2124 				pr_err("Couldn't synthesize evsel evsel.\n");
2125 				return err;
2126 			}
2127 		}
2128 
2129 		if (evsel->core.own_cpus) {
2130 			err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2131 			if (err < 0) {
2132 				pr_err("Couldn't synthesize evsel cpus.\n");
2133 				return err;
2134 			}
2135 		}
2136 
2137 		/*
2138 		 * Name is needed only for pipe output,
2139 		 * perf.data carries event names.
2140 		 */
2141 		if (is_pipe) {
2142 			err = perf_event__synthesize_event_update_name(tool, evsel, process);
2143 			if (err < 0) {
2144 				pr_err("Couldn't synthesize evsel name.\n");
2145 				return err;
2146 			}
2147 		}
2148 	}
2149 	return 0;
2150 }
2151 
perf_event__synthesize_attr(const struct perf_tool * tool,struct perf_event_attr * attr,u32 ids,u64 * id,perf_event__handler_t process)2152 int perf_event__synthesize_attr(const struct perf_tool *tool, struct perf_event_attr *attr,
2153 				u32 ids, u64 *id, perf_event__handler_t process)
2154 {
2155 	union perf_event *ev;
2156 	size_t size;
2157 	int err;
2158 
2159 	size = sizeof(struct perf_event_attr);
2160 	size = PERF_ALIGN(size, sizeof(u64));
2161 	size += sizeof(struct perf_event_header);
2162 	size += ids * sizeof(u64);
2163 
2164 	ev = zalloc(size);
2165 
2166 	if (ev == NULL)
2167 		return -ENOMEM;
2168 
2169 	ev->attr.attr = *attr;
2170 	memcpy(perf_record_header_attr_id(ev), id, ids * sizeof(u64));
2171 
2172 	ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2173 	ev->attr.header.size = (u16)size;
2174 
2175 	if (ev->attr.header.size == size)
2176 		err = process(tool, ev, NULL, NULL);
2177 	else
2178 		err = -E2BIG;
2179 
2180 	free(ev);
2181 
2182 	return err;
2183 }
2184 
2185 #ifdef HAVE_LIBTRACEEVENT
perf_event__synthesize_tracing_data(const struct perf_tool * tool,int fd,struct evlist * evlist,perf_event__handler_t process)2186 int perf_event__synthesize_tracing_data(const struct perf_tool *tool, int fd, struct evlist *evlist,
2187 					perf_event__handler_t process)
2188 {
2189 	union perf_event ev;
2190 	struct tracing_data *tdata;
2191 	ssize_t size = 0, aligned_size = 0, padding;
2192 	struct feat_fd ff;
2193 
2194 	/*
2195 	 * We are going to store the size of the data followed
2196 	 * by the data contents. Since the fd descriptor is a pipe,
2197 	 * we cannot seek back to store the size of the data once
2198 	 * we know it. Instead we:
2199 	 *
2200 	 * - write the tracing data to the temp file
2201 	 * - get/write the data size to pipe
2202 	 * - write the tracing data from the temp file
2203 	 *   to the pipe
2204 	 */
2205 	tdata = tracing_data_get(&evlist->core.entries, fd, true);
2206 	if (!tdata)
2207 		return -1;
2208 
2209 	memset(&ev, 0, sizeof(ev.tracing_data));
2210 
2211 	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2212 	size = tdata->size;
2213 	aligned_size = PERF_ALIGN(size, sizeof(u64));
2214 	padding = aligned_size - size;
2215 	ev.tracing_data.header.size = sizeof(ev.tracing_data);
2216 	ev.tracing_data.size = aligned_size;
2217 
2218 	process(tool, &ev, NULL, NULL);
2219 
2220 	/*
2221 	 * The put function will copy all the tracing data
2222 	 * stored in temp file to the pipe.
2223 	 */
2224 	tracing_data_put(tdata);
2225 
2226 	ff = (struct feat_fd){ .fd = fd };
2227 	if (write_padded(&ff, NULL, 0, padding))
2228 		return -1;
2229 
2230 	return aligned_size;
2231 }
2232 #endif
2233 
perf_event__synthesize_build_id(const struct perf_tool * tool,struct perf_sample * sample,struct machine * machine,perf_event__handler_t process,const struct evsel * evsel,__u16 misc,const struct build_id * bid,const char * filename)2234 int perf_event__synthesize_build_id(const struct perf_tool *tool,
2235 				    struct perf_sample *sample,
2236 				    struct machine *machine,
2237 				    perf_event__handler_t process,
2238 				    const struct evsel *evsel,
2239 				    __u16 misc,
2240 				    const struct build_id *bid,
2241 				    const char *filename)
2242 {
2243 	union perf_event ev;
2244 	size_t len;
2245 
2246 	len = sizeof(ev.build_id) + strlen(filename) + 1;
2247 	len = PERF_ALIGN(len, sizeof(u64));
2248 
2249 	memset(&ev, 0, len);
2250 
2251 	ev.build_id.size = min(bid->size, sizeof(ev.build_id.build_id));
2252 	memcpy(ev.build_id.build_id, bid->data, ev.build_id.size);
2253 	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2254 	ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
2255 	ev.build_id.pid = machine->pid;
2256 	ev.build_id.header.size = len;
2257 	strcpy(ev.build_id.filename, filename);
2258 
2259 	if (evsel) {
2260 		void *array = &ev;
2261 		int ret;
2262 
2263 		array += ev.header.size;
2264 		ret = perf_event__synthesize_id_sample(array, evsel->core.attr.sample_type, sample);
2265 		if (ret < 0)
2266 			return ret;
2267 
2268 		if (ret & 7) {
2269 			pr_err("Bad id sample size %d\n", ret);
2270 			return -EINVAL;
2271 		}
2272 
2273 		ev.header.size += ret;
2274 	}
2275 
2276 	return process(tool, &ev, sample, machine);
2277 }
2278 
perf_event__synthesize_mmap2_build_id(const struct perf_tool * tool,struct perf_sample * sample,struct machine * machine,perf_event__handler_t process,const struct evsel * evsel,__u16 misc,__u32 pid,__u32 tid,__u64 start,__u64 len,__u64 pgoff,const struct build_id * bid,__u32 prot,__u32 flags,const char * filename)2279 int perf_event__synthesize_mmap2_build_id(const struct perf_tool *tool,
2280 					  struct perf_sample *sample,
2281 					  struct machine *machine,
2282 					  perf_event__handler_t process,
2283 					  const struct evsel *evsel,
2284 					  __u16 misc,
2285 					  __u32 pid, __u32 tid,
2286 					  __u64 start, __u64 len, __u64 pgoff,
2287 					  const struct build_id *bid,
2288 					  __u32 prot, __u32 flags,
2289 					  const char *filename)
2290 {
2291 	union perf_event ev;
2292 	size_t ev_len;
2293 	void *array;
2294 	int ret;
2295 
2296 	ev_len = sizeof(ev.mmap2) - sizeof(ev.mmap2.filename) + strlen(filename) + 1;
2297 	ev_len = PERF_ALIGN(ev_len, sizeof(u64));
2298 
2299 	memset(&ev, 0, ev_len);
2300 
2301 	ev.mmap2.header.type = PERF_RECORD_MMAP2;
2302 	ev.mmap2.header.misc = misc | PERF_RECORD_MISC_MMAP_BUILD_ID;
2303 	ev.mmap2.header.size = ev_len;
2304 
2305 	ev.mmap2.pid = pid;
2306 	ev.mmap2.tid = tid;
2307 	ev.mmap2.start = start;
2308 	ev.mmap2.len = len;
2309 	ev.mmap2.pgoff = pgoff;
2310 
2311 	ev.mmap2.build_id_size = min(bid->size, sizeof(ev.mmap2.build_id));
2312 	memcpy(ev.mmap2.build_id, bid->data, ev.mmap2.build_id_size);
2313 
2314 	ev.mmap2.prot = prot;
2315 	ev.mmap2.flags = flags;
2316 
2317 	memcpy(ev.mmap2.filename, filename, min(strlen(filename), sizeof(ev.mmap.filename)));
2318 
2319 	array = &ev;
2320 	array += ev.header.size;
2321 	ret = perf_event__synthesize_id_sample(array, evsel->core.attr.sample_type, sample);
2322 	if (ret < 0)
2323 		return ret;
2324 
2325 	if (ret & 7) {
2326 		pr_err("Bad id sample size %d\n", ret);
2327 		return -EINVAL;
2328 	}
2329 
2330 	ev.header.size += ret;
2331 
2332 	return process(tool, &ev, sample, machine);
2333 }
2334 
perf_event__synthesize_stat_events(struct perf_stat_config * config,const struct perf_tool * tool,struct evlist * evlist,perf_event__handler_t process,bool attrs)2335 int perf_event__synthesize_stat_events(struct perf_stat_config *config, const struct perf_tool *tool,
2336 				       struct evlist *evlist, perf_event__handler_t process, bool attrs)
2337 {
2338 	int err;
2339 
2340 	if (attrs) {
2341 		err = perf_event__synthesize_attrs(tool, evlist, process);
2342 		if (err < 0) {
2343 			pr_err("Couldn't synthesize attrs.\n");
2344 			return err;
2345 		}
2346 	}
2347 
2348 	err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2349 	err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2350 	if (err < 0) {
2351 		pr_err("Couldn't synthesize thread map.\n");
2352 		return err;
2353 	}
2354 
2355 	err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2356 	if (err < 0) {
2357 		pr_err("Couldn't synthesize thread map.\n");
2358 		return err;
2359 	}
2360 
2361 	err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2362 	if (err < 0) {
2363 		pr_err("Couldn't synthesize config.\n");
2364 		return err;
2365 	}
2366 
2367 	return 0;
2368 }
2369 
2370 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2371 
perf_event__synthesize_features(const struct perf_tool * tool,struct perf_session * session,struct evlist * evlist,perf_event__handler_t process)2372 int perf_event__synthesize_features(const struct perf_tool *tool, struct perf_session *session,
2373 				    struct evlist *evlist, perf_event__handler_t process)
2374 {
2375 	struct perf_header *header = &session->header;
2376 	struct perf_record_header_feature *fe;
2377 	struct feat_fd ff;
2378 	size_t sz, sz_hdr;
2379 	int feat, ret;
2380 
2381 	sz_hdr = sizeof(fe->header);
2382 	sz = sizeof(union perf_event);
2383 	/* get a nice alignment */
2384 	sz = PERF_ALIGN(sz, page_size);
2385 
2386 	memset(&ff, 0, sizeof(ff));
2387 
2388 	ff.buf = malloc(sz);
2389 	if (!ff.buf)
2390 		return -ENOMEM;
2391 
2392 	ff.size = sz - sz_hdr;
2393 	ff.ph = &session->header;
2394 
2395 	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2396 		if (!feat_ops[feat].synthesize) {
2397 			pr_debug("No record header feature for header :%d\n", feat);
2398 			continue;
2399 		}
2400 
2401 		ff.offset = sizeof(*fe);
2402 
2403 		ret = feat_ops[feat].write(&ff, evlist);
2404 		if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2405 			pr_debug("Error writing feature\n");
2406 			continue;
2407 		}
2408 		/* ff.buf may have changed due to realloc in do_write() */
2409 		fe = ff.buf;
2410 		memset(fe, 0, sizeof(*fe));
2411 
2412 		fe->feat_id = feat;
2413 		fe->header.type = PERF_RECORD_HEADER_FEATURE;
2414 		fe->header.size = ff.offset;
2415 
2416 		ret = process(tool, ff.buf, NULL, NULL);
2417 		if (ret) {
2418 			free(ff.buf);
2419 			return ret;
2420 		}
2421 	}
2422 
2423 	/* Send HEADER_LAST_FEATURE mark. */
2424 	fe = ff.buf;
2425 	fe->feat_id     = HEADER_LAST_FEATURE;
2426 	fe->header.type = PERF_RECORD_HEADER_FEATURE;
2427 	fe->header.size = sizeof(*fe);
2428 
2429 	ret = process(tool, ff.buf, NULL, NULL);
2430 
2431 	free(ff.buf);
2432 	return ret;
2433 }
2434 
perf_event__synthesize_for_pipe(const struct perf_tool * tool,struct perf_session * session,struct perf_data * data,perf_event__handler_t process)2435 int perf_event__synthesize_for_pipe(const struct perf_tool *tool,
2436 				    struct perf_session *session,
2437 				    struct perf_data *data,
2438 				    perf_event__handler_t process)
2439 {
2440 	int err;
2441 	int ret = 0;
2442 	struct evlist *evlist = session->evlist;
2443 
2444 	/*
2445 	 * We need to synthesize events first, because some
2446 	 * features works on top of them (on report side).
2447 	 */
2448 	err = perf_event__synthesize_attrs(tool, evlist, process);
2449 	if (err < 0) {
2450 		pr_err("Couldn't synthesize attrs.\n");
2451 		return err;
2452 	}
2453 	ret += err;
2454 
2455 	err = perf_event__synthesize_features(tool, session, evlist, process);
2456 	if (err < 0) {
2457 		pr_err("Couldn't synthesize features.\n");
2458 		return err;
2459 	}
2460 	ret += err;
2461 
2462 #ifdef HAVE_LIBTRACEEVENT
2463 	if (have_tracepoints(&evlist->core.entries)) {
2464 		int fd = perf_data__fd(data);
2465 
2466 		/*
2467 		 * FIXME err <= 0 here actually means that
2468 		 * there were no tracepoints so its not really
2469 		 * an error, just that we don't need to
2470 		 * synthesize anything.  We really have to
2471 		 * return this more properly and also
2472 		 * propagate errors that now are calling die()
2473 		 */
2474 		err = perf_event__synthesize_tracing_data(tool,	fd, evlist,
2475 							  process);
2476 		if (err <= 0) {
2477 			pr_err("Couldn't record tracing data.\n");
2478 			return err;
2479 		}
2480 		ret += err;
2481 	}
2482 #else
2483 	(void)data;
2484 #endif
2485 
2486 	return ret;
2487 }
2488 
parse_synth_opt(char * synth)2489 int parse_synth_opt(char *synth)
2490 {
2491 	char *p, *q;
2492 	int ret = 0;
2493 
2494 	if (synth == NULL)
2495 		return -1;
2496 
2497 	for (q = synth; (p = strsep(&q, ",")); p = q) {
2498 		if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2499 			return 0;
2500 
2501 		if (!strcasecmp(p, "all"))
2502 			return PERF_SYNTH_ALL;
2503 
2504 		if (!strcasecmp(p, "task"))
2505 			ret |= PERF_SYNTH_TASK;
2506 		else if (!strcasecmp(p, "mmap"))
2507 			ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2508 		else if (!strcasecmp(p, "cgroup"))
2509 			ret |= PERF_SYNTH_CGROUP;
2510 		else
2511 			return -1;
2512 	}
2513 
2514 	return ret;
2515 }
2516