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