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TOMOYO Linux Cross Reference
Linux/tools/perf/util/synthetic-events.c

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  1 // SPDX-License-Identifier: GPL-2.0-only 
  2 
  3 #include "util/debug.h"
  4 #include "util/dso.h"
  5 #include "util/event.h"
  6 #include "util/evlist.h"
  7 #include "util/machine.h"
  8 #include "util/map.h"
  9 #include "util/map_symbol.h"
 10 #include "util/branch.h"
 11 #include "util/memswap.h"
 12 #include "util/namespaces.h"
 13 #include "util/session.h"
 14 #include "util/stat.h"
 15 #include "util/symbol.h"
 16 #include "util/synthetic-events.h"
 17 #include "util/target.h"
 18 #include "util/time-utils.h"
 19 #include <linux/bitops.h>
 20 #include <linux/kernel.h>
 21 #include <linux/string.h>
 22 #include <linux/zalloc.h>
 23 #include <linux/perf_event.h>
 24 #include <asm/bug.h>
 25 #include <perf/evsel.h>
 26 #include <internal/cpumap.h>
 27 #include <perf/cpumap.h>
 28 #include <internal/lib.h> // page_size
 29 #include <internal/threadmap.h>
 30 #include <perf/threadmap.h>
 31 #include <symbol/kallsyms.h>
 32 #include <dirent.h>
 33 #include <errno.h>
 34 #include <inttypes.h>
 35 #include <stdio.h>
 36 #include <string.h>
 37 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
 38 #include <api/fs/fs.h>
 39 #include <sys/types.h>
 40 #include <sys/stat.h>
 41 #include <fcntl.h>
 42 #include <unistd.h>
 43 
 44 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
 45 
 46 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
 47 
 48 int perf_tool__process_synth_event(struct perf_tool *tool,
 49                                    union perf_event *event,
 50                                    struct machine *machine,
 51                                    perf_event__handler_t process)
 52 {
 53         struct perf_sample synth_sample = {
 54                 .pid       = -1,
 55                 .tid       = -1,
 56                 .time      = -1,
 57                 .stream_id = -1,
 58                 .cpu       = -1,
 59                 .period    = 1,
 60                 .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
 61         };
 62 
 63         return process(tool, event, &synth_sample, machine);
 64 };
 65 
 66 /*
 67  * Assumes that the first 4095 bytes of /proc/pid/stat contains
 68  * the comm, tgid and ppid.
 69  */
 70 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
 71                                     pid_t *tgid, pid_t *ppid)
 72 {
 73         char filename[PATH_MAX];
 74         char bf[4096];
 75         int fd;
 76         size_t size = 0;
 77         ssize_t n;
 78         char *name, *tgids, *ppids;
 79 
 80         *tgid = -1;
 81         *ppid = -1;
 82 
 83         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
 84 
 85         fd = open(filename, O_RDONLY);
 86         if (fd < 0) {
 87                 pr_debug("couldn't open %s\n", filename);
 88                 return -1;
 89         }
 90 
 91         n = read(fd, bf, sizeof(bf) - 1);
 92         close(fd);
 93         if (n <= 0) {
 94                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
 95                            pid);
 96                 return -1;
 97         }
 98         bf[n] = '\0';
 99 
100         name = strstr(bf, "Name:");
101         tgids = strstr(bf, "Tgid:");
102         ppids = strstr(bf, "PPid:");
103 
104         if (name) {
105                 char *nl;
106 
107                 name = skip_spaces(name + 5);  /* strlen("Name:") */
108                 nl = strchr(name, '\n');
109                 if (nl)
110                         *nl = '\0';
111 
112                 size = strlen(name);
113                 if (size >= len)
114                         size = len - 1;
115                 memcpy(comm, name, size);
116                 comm[size] = '\0';
117         } else {
118                 pr_debug("Name: string not found for pid %d\n", pid);
119         }
120 
121         if (tgids) {
122                 tgids += 5;  /* strlen("Tgid:") */
123                 *tgid = atoi(tgids);
124         } else {
125                 pr_debug("Tgid: string not found for pid %d\n", pid);
126         }
127 
128         if (ppids) {
129                 ppids += 5;  /* strlen("PPid:") */
130                 *ppid = atoi(ppids);
131         } else {
132                 pr_debug("PPid: string not found for pid %d\n", pid);
133         }
134 
135         return 0;
136 }
137 
138 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
139                                     struct machine *machine,
140                                     pid_t *tgid, pid_t *ppid)
141 {
142         size_t size;
143 
144         *ppid = -1;
145 
146         memset(&event->comm, 0, sizeof(event->comm));
147 
148         if (machine__is_host(machine)) {
149                 if (perf_event__get_comm_ids(pid, event->comm.comm,
150                                              sizeof(event->comm.comm),
151                                              tgid, ppid) != 0) {
152                         return -1;
153                 }
154         } else {
155                 *tgid = machine->pid;
156         }
157 
158         if (*tgid < 0)
159                 return -1;
160 
161         event->comm.pid = *tgid;
162         event->comm.header.type = PERF_RECORD_COMM;
163 
164         size = strlen(event->comm.comm) + 1;
165         size = PERF_ALIGN(size, sizeof(u64));
166         memset(event->comm.comm + size, 0, machine->id_hdr_size);
167         event->comm.header.size = (sizeof(event->comm) -
168                                 (sizeof(event->comm.comm) - size) +
169                                 machine->id_hdr_size);
170         event->comm.tid = pid;
171 
172         return 0;
173 }
174 
175 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
176                                          union perf_event *event, pid_t pid,
177                                          perf_event__handler_t process,
178                                          struct machine *machine)
179 {
180         pid_t tgid, ppid;
181 
182         if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
183                 return -1;
184 
185         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
186                 return -1;
187 
188         return tgid;
189 }
190 
191 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
192                                          struct perf_ns_link_info *ns_link_info)
193 {
194         struct stat64 st;
195         char proc_ns[128];
196 
197         sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
198         if (stat64(proc_ns, &st) == 0) {
199                 ns_link_info->dev = st.st_dev;
200                 ns_link_info->ino = st.st_ino;
201         }
202 }
203 
204 int perf_event__synthesize_namespaces(struct perf_tool *tool,
205                                       union perf_event *event,
206                                       pid_t pid, pid_t tgid,
207                                       perf_event__handler_t process,
208                                       struct machine *machine)
209 {
210         u32 idx;
211         struct perf_ns_link_info *ns_link_info;
212 
213         if (!tool || !tool->namespace_events)
214                 return 0;
215 
216         memset(&event->namespaces, 0, (sizeof(event->namespaces) +
217                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
218                machine->id_hdr_size));
219 
220         event->namespaces.pid = tgid;
221         event->namespaces.tid = pid;
222 
223         event->namespaces.nr_namespaces = NR_NAMESPACES;
224 
225         ns_link_info = event->namespaces.link_info;
226 
227         for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
228                 perf_event__get_ns_link_info(pid, perf_ns__name(idx),
229                                              &ns_link_info[idx]);
230 
231         event->namespaces.header.type = PERF_RECORD_NAMESPACES;
232 
233         event->namespaces.header.size = (sizeof(event->namespaces) +
234                         (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
235                         machine->id_hdr_size);
236 
237         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
238                 return -1;
239 
240         return 0;
241 }
242 
243 static int perf_event__synthesize_fork(struct perf_tool *tool,
244                                        union perf_event *event,
245                                        pid_t pid, pid_t tgid, pid_t ppid,
246                                        perf_event__handler_t process,
247                                        struct machine *machine)
248 {
249         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
250 
251         /*
252          * for main thread set parent to ppid from status file. For other
253          * threads set parent pid to main thread. ie., assume main thread
254          * spawns all threads in a process
255         */
256         if (tgid == pid) {
257                 event->fork.ppid = ppid;
258                 event->fork.ptid = ppid;
259         } else {
260                 event->fork.ppid = tgid;
261                 event->fork.ptid = tgid;
262         }
263         event->fork.pid  = tgid;
264         event->fork.tid  = pid;
265         event->fork.header.type = PERF_RECORD_FORK;
266         event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
267 
268         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
269 
270         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
271                 return -1;
272 
273         return 0;
274 }
275 
276 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
277                                        union perf_event *event,
278                                        pid_t pid, pid_t tgid,
279                                        perf_event__handler_t process,
280                                        struct machine *machine,
281                                        bool mmap_data)
282 {
283         char filename[PATH_MAX];
284         FILE *fp;
285         unsigned long long t;
286         bool truncation = false;
287         unsigned long long timeout = proc_map_timeout * 1000000ULL;
288         int rc = 0;
289         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
290         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
291 
292         if (machine__is_default_guest(machine))
293                 return 0;
294 
295         snprintf(filename, sizeof(filename), "%s/proc/%d/task/%d/maps",
296                  machine->root_dir, pid, pid);
297 
298         fp = fopen(filename, "r");
299         if (fp == NULL) {
300                 /*
301                  * We raced with a task exiting - just return:
302                  */
303                 pr_debug("couldn't open %s\n", filename);
304                 return -1;
305         }
306 
307         event->header.type = PERF_RECORD_MMAP2;
308         t = rdclock();
309 
310         while (1) {
311                 char bf[BUFSIZ];
312                 char prot[5];
313                 char execname[PATH_MAX];
314                 char anonstr[] = "//anon";
315                 unsigned int ino;
316                 size_t size;
317                 ssize_t n;
318 
319                 if (fgets(bf, sizeof(bf), fp) == NULL)
320                         break;
321 
322                 if ((rdclock() - t) > timeout) {
323                         pr_warning("Reading %s time out. "
324                                    "You may want to increase "
325                                    "the time limit by --proc-map-timeout\n",
326                                    filename);
327                         truncation = true;
328                         goto out;
329                 }
330 
331                 /* ensure null termination since stack will be reused. */
332                 strcpy(execname, "");
333 
334                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
335                 n = sscanf(bf, "%"PRI_lx64"-%"PRI_lx64" %s %"PRI_lx64" %x:%x %u %[^\n]\n",
336                        &event->mmap2.start, &event->mmap2.len, prot,
337                        &event->mmap2.pgoff, &event->mmap2.maj,
338                        &event->mmap2.min,
339                        &ino, execname);
340 
341                 /*
342                  * Anon maps don't have the execname.
343                  */
344                 if (n < 7)
345                         continue;
346 
347                 event->mmap2.ino = (u64)ino;
348 
349                 /*
350                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
351                  */
352                 if (machine__is_host(machine))
353                         event->header.misc = PERF_RECORD_MISC_USER;
354                 else
355                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
356 
357                 /* map protection and flags bits */
358                 event->mmap2.prot = 0;
359                 event->mmap2.flags = 0;
360                 if (prot[0] == 'r')
361                         event->mmap2.prot |= PROT_READ;
362                 if (prot[1] == 'w')
363                         event->mmap2.prot |= PROT_WRITE;
364                 if (prot[2] == 'x')
365                         event->mmap2.prot |= PROT_EXEC;
366 
367                 if (prot[3] == 's')
368                         event->mmap2.flags |= MAP_SHARED;
369                 else
370                         event->mmap2.flags |= MAP_PRIVATE;
371 
372                 if (prot[2] != 'x') {
373                         if (!mmap_data || prot[0] != 'r')
374                                 continue;
375 
376                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
377                 }
378 
379 out:
380                 if (truncation)
381                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
382 
383                 if (!strcmp(execname, ""))
384                         strcpy(execname, anonstr);
385 
386                 if (hugetlbfs_mnt_len &&
387                     !strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
388                         strcpy(execname, anonstr);
389                         event->mmap2.flags |= MAP_HUGETLB;
390                 }
391 
392                 size = strlen(execname) + 1;
393                 memcpy(event->mmap2.filename, execname, size);
394                 size = PERF_ALIGN(size, sizeof(u64));
395                 event->mmap2.len -= event->mmap.start;
396                 event->mmap2.header.size = (sizeof(event->mmap2) -
397                                         (sizeof(event->mmap2.filename) - size));
398                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
399                 event->mmap2.header.size += machine->id_hdr_size;
400                 event->mmap2.pid = tgid;
401                 event->mmap2.tid = pid;
402 
403                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
404                         rc = -1;
405                         break;
406                 }
407 
408                 if (truncation)
409                         break;
410         }
411 
412         fclose(fp);
413         return rc;
414 }
415 
416 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
417                                    struct machine *machine)
418 {
419         int rc = 0;
420         struct map *pos;
421         struct maps *maps = machine__kernel_maps(machine);
422         union perf_event *event = zalloc((sizeof(event->mmap) +
423                                           machine->id_hdr_size));
424         if (event == NULL) {
425                 pr_debug("Not enough memory synthesizing mmap event "
426                          "for kernel modules\n");
427                 return -1;
428         }
429 
430         event->header.type = PERF_RECORD_MMAP;
431 
432         /*
433          * kernel uses 0 for user space maps, see kernel/perf_event.c
434          * __perf_event_mmap
435          */
436         if (machine__is_host(machine))
437                 event->header.misc = PERF_RECORD_MISC_KERNEL;
438         else
439                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
440 
441         maps__for_each_entry(maps, pos) {
442                 size_t size;
443 
444                 if (!__map__is_kmodule(pos))
445                         continue;
446 
447                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
448                 event->mmap.header.type = PERF_RECORD_MMAP;
449                 event->mmap.header.size = (sizeof(event->mmap) -
450                                         (sizeof(event->mmap.filename) - size));
451                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
452                 event->mmap.header.size += machine->id_hdr_size;
453                 event->mmap.start = pos->start;
454                 event->mmap.len   = pos->end - pos->start;
455                 event->mmap.pid   = machine->pid;
456 
457                 memcpy(event->mmap.filename, pos->dso->long_name,
458                        pos->dso->long_name_len + 1);
459                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
460                         rc = -1;
461                         break;
462                 }
463         }
464 
465         free(event);
466         return rc;
467 }
468 
469 static int __event__synthesize_thread(union perf_event *comm_event,
470                                       union perf_event *mmap_event,
471                                       union perf_event *fork_event,
472                                       union perf_event *namespaces_event,
473                                       pid_t pid, int full, perf_event__handler_t process,
474                                       struct perf_tool *tool, struct machine *machine, bool mmap_data)
475 {
476         char filename[PATH_MAX];
477         DIR *tasks;
478         struct dirent *dirent;
479         pid_t tgid, ppid;
480         int rc = 0;
481 
482         /* special case: only send one comm event using passed in pid */
483         if (!full) {
484                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
485                                                    process, machine);
486 
487                 if (tgid == -1)
488                         return -1;
489 
490                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
491                                                       tgid, process, machine) < 0)
492                         return -1;
493 
494                 /*
495                  * send mmap only for thread group leader
496                  * see thread__init_maps()
497                  */
498                 if (pid == tgid &&
499                     perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
500                                                        process, machine, mmap_data))
501                         return -1;
502 
503                 return 0;
504         }
505 
506         if (machine__is_default_guest(machine))
507                 return 0;
508 
509         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
510                  machine->root_dir, pid);
511 
512         tasks = opendir(filename);
513         if (tasks == NULL) {
514                 pr_debug("couldn't open %s\n", filename);
515                 return 0;
516         }
517 
518         while ((dirent = readdir(tasks)) != NULL) {
519                 char *end;
520                 pid_t _pid;
521 
522                 _pid = strtol(dirent->d_name, &end, 10);
523                 if (*end)
524                         continue;
525 
526                 rc = -1;
527                 if (perf_event__prepare_comm(comm_event, _pid, machine,
528                                              &tgid, &ppid) != 0)
529                         break;
530 
531                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
532                                                 ppid, process, machine) < 0)
533                         break;
534 
535                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
536                                                       tgid, process, machine) < 0)
537                         break;
538 
539                 /*
540                  * Send the prepared comm event
541                  */
542                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
543                         break;
544 
545                 rc = 0;
546                 if (_pid == pid) {
547                         /* process the parent's maps too */
548                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
549                                                 process, machine, mmap_data);
550                         if (rc)
551                                 break;
552                 }
553         }
554 
555         closedir(tasks);
556         return rc;
557 }
558 
559 int perf_event__synthesize_thread_map(struct perf_tool *tool,
560                                       struct perf_thread_map *threads,
561                                       perf_event__handler_t process,
562                                       struct machine *machine,
563                                       bool mmap_data)
564 {
565         union perf_event *comm_event, *mmap_event, *fork_event;
566         union perf_event *namespaces_event;
567         int err = -1, thread, j;
568 
569         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
570         if (comm_event == NULL)
571                 goto out;
572 
573         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
574         if (mmap_event == NULL)
575                 goto out_free_comm;
576 
577         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
578         if (fork_event == NULL)
579                 goto out_free_mmap;
580 
581         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
582                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
583                                   machine->id_hdr_size);
584         if (namespaces_event == NULL)
585                 goto out_free_fork;
586 
587         err = 0;
588         for (thread = 0; thread < threads->nr; ++thread) {
589                 if (__event__synthesize_thread(comm_event, mmap_event,
590                                                fork_event, namespaces_event,
591                                                perf_thread_map__pid(threads, thread), 0,
592                                                process, tool, machine,
593                                                mmap_data)) {
594                         err = -1;
595                         break;
596                 }
597 
598                 /*
599                  * comm.pid is set to thread group id by
600                  * perf_event__synthesize_comm
601                  */
602                 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
603                         bool need_leader = true;
604 
605                         /* is thread group leader in thread_map? */
606                         for (j = 0; j < threads->nr; ++j) {
607                                 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
608                                         need_leader = false;
609                                         break;
610                                 }
611                         }
612 
613                         /* if not, generate events for it */
614                         if (need_leader &&
615                             __event__synthesize_thread(comm_event, mmap_event,
616                                                        fork_event, namespaces_event,
617                                                        comm_event->comm.pid, 0,
618                                                        process, tool, machine,
619                                                        mmap_data)) {
620                                 err = -1;
621                                 break;
622                         }
623                 }
624         }
625         free(namespaces_event);
626 out_free_fork:
627         free(fork_event);
628 out_free_mmap:
629         free(mmap_event);
630 out_free_comm:
631         free(comm_event);
632 out:
633         return err;
634 }
635 
636 static int __perf_event__synthesize_threads(struct perf_tool *tool,
637                                             perf_event__handler_t process,
638                                             struct machine *machine,
639                                             bool mmap_data,
640                                             struct dirent **dirent,
641                                             int start,
642                                             int num)
643 {
644         union perf_event *comm_event, *mmap_event, *fork_event;
645         union perf_event *namespaces_event;
646         int err = -1;
647         char *end;
648         pid_t pid;
649         int i;
650 
651         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
652         if (comm_event == NULL)
653                 goto out;
654 
655         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
656         if (mmap_event == NULL)
657                 goto out_free_comm;
658 
659         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
660         if (fork_event == NULL)
661                 goto out_free_mmap;
662 
663         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
664                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
665                                   machine->id_hdr_size);
666         if (namespaces_event == NULL)
667                 goto out_free_fork;
668 
669         for (i = start; i < start + num; i++) {
670                 if (!isdigit(dirent[i]->d_name[0]))
671                         continue;
672 
673                 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
674                 /* only interested in proper numerical dirents */
675                 if (*end)
676                         continue;
677                 /*
678                  * We may race with exiting thread, so don't stop just because
679                  * one thread couldn't be synthesized.
680                  */
681                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
682                                            namespaces_event, pid, 1, process,
683                                            tool, machine, mmap_data);
684         }
685         err = 0;
686 
687         free(namespaces_event);
688 out_free_fork:
689         free(fork_event);
690 out_free_mmap:
691         free(mmap_event);
692 out_free_comm:
693         free(comm_event);
694 out:
695         return err;
696 }
697 
698 struct synthesize_threads_arg {
699         struct perf_tool *tool;
700         perf_event__handler_t process;
701         struct machine *machine;
702         bool mmap_data;
703         struct dirent **dirent;
704         int num;
705         int start;
706 };
707 
708 static void *synthesize_threads_worker(void *arg)
709 {
710         struct synthesize_threads_arg *args = arg;
711 
712         __perf_event__synthesize_threads(args->tool, args->process,
713                                          args->machine, args->mmap_data,
714                                          args->dirent,
715                                          args->start, args->num);
716         return NULL;
717 }
718 
719 int perf_event__synthesize_threads(struct perf_tool *tool,
720                                    perf_event__handler_t process,
721                                    struct machine *machine,
722                                    bool mmap_data,
723                                    unsigned int nr_threads_synthesize)
724 {
725         struct synthesize_threads_arg *args = NULL;
726         pthread_t *synthesize_threads = NULL;
727         char proc_path[PATH_MAX];
728         struct dirent **dirent;
729         int num_per_thread;
730         int m, n, i, j;
731         int thread_nr;
732         int base = 0;
733         int err = -1;
734 
735 
736         if (machine__is_default_guest(machine))
737                 return 0;
738 
739         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
740         n = scandir(proc_path, &dirent, 0, alphasort);
741         if (n < 0)
742                 return err;
743 
744         if (nr_threads_synthesize == UINT_MAX)
745                 thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
746         else
747                 thread_nr = nr_threads_synthesize;
748 
749         if (thread_nr <= 1) {
750                 err = __perf_event__synthesize_threads(tool, process,
751                                                        machine, mmap_data,
752                                                        dirent, base, n);
753                 goto free_dirent;
754         }
755         if (thread_nr > n)
756                 thread_nr = n;
757 
758         synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
759         if (synthesize_threads == NULL)
760                 goto free_dirent;
761 
762         args = calloc(sizeof(*args), thread_nr);
763         if (args == NULL)
764                 goto free_threads;
765 
766         num_per_thread = n / thread_nr;
767         m = n % thread_nr;
768         for (i = 0; i < thread_nr; i++) {
769                 args[i].tool = tool;
770                 args[i].process = process;
771                 args[i].machine = machine;
772                 args[i].mmap_data = mmap_data;
773                 args[i].dirent = dirent;
774         }
775         for (i = 0; i < m; i++) {
776                 args[i].num = num_per_thread + 1;
777                 args[i].start = i * args[i].num;
778         }
779         if (i != 0)
780                 base = args[i-1].start + args[i-1].num;
781         for (j = i; j < thread_nr; j++) {
782                 args[j].num = num_per_thread;
783                 args[j].start = base + (j - i) * args[i].num;
784         }
785 
786         for (i = 0; i < thread_nr; i++) {
787                 if (pthread_create(&synthesize_threads[i], NULL,
788                                    synthesize_threads_worker, &args[i]))
789                         goto out_join;
790         }
791         err = 0;
792 out_join:
793         for (i = 0; i < thread_nr; i++)
794                 pthread_join(synthesize_threads[i], NULL);
795         free(args);
796 free_threads:
797         free(synthesize_threads);
798 free_dirent:
799         for (i = 0; i < n; i++)
800                 zfree(&dirent[i]);
801         free(dirent);
802 
803         return err;
804 }
805 
806 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
807                                               perf_event__handler_t process __maybe_unused,
808                                               struct machine *machine __maybe_unused)
809 {
810         return 0;
811 }
812 
813 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
814                                                 perf_event__handler_t process,
815                                                 struct machine *machine)
816 {
817         size_t size;
818         struct map *map = machine__kernel_map(machine);
819         struct kmap *kmap;
820         int err;
821         union perf_event *event;
822 
823         if (map == NULL)
824                 return -1;
825 
826         kmap = map__kmap(map);
827         if (!kmap->ref_reloc_sym)
828                 return -1;
829 
830         /*
831          * We should get this from /sys/kernel/sections/.text, but till that is
832          * available use this, and after it is use this as a fallback for older
833          * kernels.
834          */
835         event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
836         if (event == NULL) {
837                 pr_debug("Not enough memory synthesizing mmap event "
838                          "for kernel modules\n");
839                 return -1;
840         }
841 
842         if (machine__is_host(machine)) {
843                 /*
844                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
845                  * see kernel/perf_event.c __perf_event_mmap
846                  */
847                 event->header.misc = PERF_RECORD_MISC_KERNEL;
848         } else {
849                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
850         }
851 
852         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
853                         "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
854         size = PERF_ALIGN(size, sizeof(u64));
855         event->mmap.header.type = PERF_RECORD_MMAP;
856         event->mmap.header.size = (sizeof(event->mmap) -
857                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
858         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
859         event->mmap.start = map->start;
860         event->mmap.len   = map->end - event->mmap.start;
861         event->mmap.pid   = machine->pid;
862 
863         err = perf_tool__process_synth_event(tool, event, machine, process);
864         free(event);
865 
866         return err;
867 }
868 
869 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
870                                        perf_event__handler_t process,
871                                        struct machine *machine)
872 {
873         int err;
874 
875         err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
876         if (err < 0)
877                 return err;
878 
879         return perf_event__synthesize_extra_kmaps(tool, process, machine);
880 }
881 
882 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
883                                       struct perf_thread_map *threads,
884                                       perf_event__handler_t process,
885                                       struct machine *machine)
886 {
887         union perf_event *event;
888         int i, err, size;
889 
890         size  = sizeof(event->thread_map);
891         size += threads->nr * sizeof(event->thread_map.entries[0]);
892 
893         event = zalloc(size);
894         if (!event)
895                 return -ENOMEM;
896 
897         event->header.type = PERF_RECORD_THREAD_MAP;
898         event->header.size = size;
899         event->thread_map.nr = threads->nr;
900 
901         for (i = 0; i < threads->nr; i++) {
902                 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
903                 char *comm = perf_thread_map__comm(threads, i);
904 
905                 if (!comm)
906                         comm = (char *) "";
907 
908                 entry->pid = perf_thread_map__pid(threads, i);
909                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
910         }
911 
912         err = process(tool, event, NULL, machine);
913 
914         free(event);
915         return err;
916 }
917 
918 static void synthesize_cpus(struct cpu_map_entries *cpus,
919                             struct perf_cpu_map *map)
920 {
921         int i;
922 
923         cpus->nr = map->nr;
924 
925         for (i = 0; i < map->nr; i++)
926                 cpus->cpu[i] = map->map[i];
927 }
928 
929 static void synthesize_mask(struct perf_record_record_cpu_map *mask,
930                             struct perf_cpu_map *map, int max)
931 {
932         int i;
933 
934         mask->nr = BITS_TO_LONGS(max);
935         mask->long_size = sizeof(long);
936 
937         for (i = 0; i < map->nr; i++)
938                 set_bit(map->map[i], mask->mask);
939 }
940 
941 static size_t cpus_size(struct perf_cpu_map *map)
942 {
943         return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
944 }
945 
946 static size_t mask_size(struct perf_cpu_map *map, int *max)
947 {
948         int i;
949 
950         *max = 0;
951 
952         for (i = 0; i < map->nr; i++) {
953                 /* bit possition of the cpu is + 1 */
954                 int bit = map->map[i] + 1;
955 
956                 if (bit > *max)
957                         *max = bit;
958         }
959 
960         return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long);
961 }
962 
963 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max)
964 {
965         size_t size_cpus, size_mask;
966         bool is_dummy = perf_cpu_map__empty(map);
967 
968         /*
969          * Both array and mask data have variable size based
970          * on the number of cpus and their actual values.
971          * The size of the 'struct perf_record_cpu_map_data' is:
972          *
973          *   array = size of 'struct cpu_map_entries' +
974          *           number of cpus * sizeof(u64)
975          *
976          *   mask  = size of 'struct perf_record_record_cpu_map' +
977          *           maximum cpu bit converted to size of longs
978          *
979          * and finaly + the size of 'struct perf_record_cpu_map_data'.
980          */
981         size_cpus = cpus_size(map);
982         size_mask = mask_size(map, max);
983 
984         if (is_dummy || (size_cpus < size_mask)) {
985                 *size += size_cpus;
986                 *type  = PERF_CPU_MAP__CPUS;
987         } else {
988                 *size += size_mask;
989                 *type  = PERF_CPU_MAP__MASK;
990         }
991 
992         *size += sizeof(struct perf_record_cpu_map_data);
993         *size = PERF_ALIGN(*size, sizeof(u64));
994         return zalloc(*size);
995 }
996 
997 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map,
998                               u16 type, int max)
999 {
1000         data->type = type;
1001 
1002         switch (type) {
1003         case PERF_CPU_MAP__CPUS:
1004                 synthesize_cpus((struct cpu_map_entries *) data->data, map);
1005                 break;
1006         case PERF_CPU_MAP__MASK:
1007                 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max);
1008         default:
1009                 break;
1010         };
1011 }
1012 
1013 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map)
1014 {
1015         size_t size = sizeof(struct perf_record_cpu_map);
1016         struct perf_record_cpu_map *event;
1017         int max;
1018         u16 type;
1019 
1020         event = cpu_map_data__alloc(map, &size, &type, &max);
1021         if (!event)
1022                 return NULL;
1023 
1024         event->header.type = PERF_RECORD_CPU_MAP;
1025         event->header.size = size;
1026         event->data.type   = type;
1027 
1028         cpu_map_data__synthesize(&event->data, map, type, max);
1029         return event;
1030 }
1031 
1032 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1033                                    struct perf_cpu_map *map,
1034                                    perf_event__handler_t process,
1035                                    struct machine *machine)
1036 {
1037         struct perf_record_cpu_map *event;
1038         int err;
1039 
1040         event = cpu_map_event__new(map);
1041         if (!event)
1042                 return -ENOMEM;
1043 
1044         err = process(tool, (union perf_event *) event, NULL, machine);
1045 
1046         free(event);
1047         return err;
1048 }
1049 
1050 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1051                                        struct perf_stat_config *config,
1052                                        perf_event__handler_t process,
1053                                        struct machine *machine)
1054 {
1055         struct perf_record_stat_config *event;
1056         int size, i = 0, err;
1057 
1058         size  = sizeof(*event);
1059         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1060 
1061         event = zalloc(size);
1062         if (!event)
1063                 return -ENOMEM;
1064 
1065         event->header.type = PERF_RECORD_STAT_CONFIG;
1066         event->header.size = size;
1067         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1068 
1069 #define ADD(__term, __val)                                      \
1070         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1071         event->data[i].val = __val;                             \
1072         i++;
1073 
1074         ADD(AGGR_MODE,  config->aggr_mode)
1075         ADD(INTERVAL,   config->interval)
1076         ADD(SCALE,      config->scale)
1077 
1078         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1079                   "stat config terms unbalanced\n");
1080 #undef ADD
1081 
1082         err = process(tool, (union perf_event *) event, NULL, machine);
1083 
1084         free(event);
1085         return err;
1086 }
1087 
1088 int perf_event__synthesize_stat(struct perf_tool *tool,
1089                                 u32 cpu, u32 thread, u64 id,
1090                                 struct perf_counts_values *count,
1091                                 perf_event__handler_t process,
1092                                 struct machine *machine)
1093 {
1094         struct perf_record_stat event;
1095 
1096         event.header.type = PERF_RECORD_STAT;
1097         event.header.size = sizeof(event);
1098         event.header.misc = 0;
1099 
1100         event.id        = id;
1101         event.cpu       = cpu;
1102         event.thread    = thread;
1103         event.val       = count->val;
1104         event.ena       = count->ena;
1105         event.run       = count->run;
1106 
1107         return process(tool, (union perf_event *) &event, NULL, machine);
1108 }
1109 
1110 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1111                                       u64 evtime, u64 type,
1112                                       perf_event__handler_t process,
1113                                       struct machine *machine)
1114 {
1115         struct perf_record_stat_round event;
1116 
1117         event.header.type = PERF_RECORD_STAT_ROUND;
1118         event.header.size = sizeof(event);
1119         event.header.misc = 0;
1120 
1121         event.time = evtime;
1122         event.type = type;
1123 
1124         return process(tool, (union perf_event *) &event, NULL, machine);
1125 }
1126 
1127 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1128 {
1129         size_t sz, result = sizeof(struct perf_record_sample);
1130 
1131         if (type & PERF_SAMPLE_IDENTIFIER)
1132                 result += sizeof(u64);
1133 
1134         if (type & PERF_SAMPLE_IP)
1135                 result += sizeof(u64);
1136 
1137         if (type & PERF_SAMPLE_TID)
1138                 result += sizeof(u64);
1139 
1140         if (type & PERF_SAMPLE_TIME)
1141                 result += sizeof(u64);
1142 
1143         if (type & PERF_SAMPLE_ADDR)
1144                 result += sizeof(u64);
1145 
1146         if (type & PERF_SAMPLE_ID)
1147                 result += sizeof(u64);
1148 
1149         if (type & PERF_SAMPLE_STREAM_ID)
1150                 result += sizeof(u64);
1151 
1152         if (type & PERF_SAMPLE_CPU)
1153                 result += sizeof(u64);
1154 
1155         if (type & PERF_SAMPLE_PERIOD)
1156                 result += sizeof(u64);
1157 
1158         if (type & PERF_SAMPLE_READ) {
1159                 result += sizeof(u64);
1160                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1161                         result += sizeof(u64);
1162                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1163                         result += sizeof(u64);
1164                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1165                 if (read_format & PERF_FORMAT_GROUP) {
1166                         sz = sample->read.group.nr *
1167                              sizeof(struct sample_read_value);
1168                         result += sz;
1169                 } else {
1170                         result += sizeof(u64);
1171                 }
1172         }
1173 
1174         if (type & PERF_SAMPLE_CALLCHAIN) {
1175                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1176                 result += sz;
1177         }
1178 
1179         if (type & PERF_SAMPLE_RAW) {
1180                 result += sizeof(u32);
1181                 result += sample->raw_size;
1182         }
1183 
1184         if (type & PERF_SAMPLE_BRANCH_STACK) {
1185                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1186                 sz += sizeof(u64);
1187                 result += sz;
1188         }
1189 
1190         if (type & PERF_SAMPLE_REGS_USER) {
1191                 if (sample->user_regs.abi) {
1192                         result += sizeof(u64);
1193                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1194                         result += sz;
1195                 } else {
1196                         result += sizeof(u64);
1197                 }
1198         }
1199 
1200         if (type & PERF_SAMPLE_STACK_USER) {
1201                 sz = sample->user_stack.size;
1202                 result += sizeof(u64);
1203                 if (sz) {
1204                         result += sz;
1205                         result += sizeof(u64);
1206                 }
1207         }
1208 
1209         if (type & PERF_SAMPLE_WEIGHT)
1210                 result += sizeof(u64);
1211 
1212         if (type & PERF_SAMPLE_DATA_SRC)
1213                 result += sizeof(u64);
1214 
1215         if (type & PERF_SAMPLE_TRANSACTION)
1216                 result += sizeof(u64);
1217 
1218         if (type & PERF_SAMPLE_REGS_INTR) {
1219                 if (sample->intr_regs.abi) {
1220                         result += sizeof(u64);
1221                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1222                         result += sz;
1223                 } else {
1224                         result += sizeof(u64);
1225                 }
1226         }
1227 
1228         if (type & PERF_SAMPLE_PHYS_ADDR)
1229                 result += sizeof(u64);
1230 
1231         if (type & PERF_SAMPLE_AUX) {
1232                 result += sizeof(u64);
1233                 result += sample->aux_sample.size;
1234         }
1235 
1236         return result;
1237 }
1238 
1239 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1240                                   const struct perf_sample *sample)
1241 {
1242         __u64 *array;
1243         size_t sz;
1244         /*
1245          * used for cross-endian analysis. See git commit 65014ab3
1246          * for why this goofiness is needed.
1247          */
1248         union u64_swap u;
1249 
1250         array = event->sample.array;
1251 
1252         if (type & PERF_SAMPLE_IDENTIFIER) {
1253                 *array = sample->id;
1254                 array++;
1255         }
1256 
1257         if (type & PERF_SAMPLE_IP) {
1258                 *array = sample->ip;
1259                 array++;
1260         }
1261 
1262         if (type & PERF_SAMPLE_TID) {
1263                 u.val32[0] = sample->pid;
1264                 u.val32[1] = sample->tid;
1265                 *array = u.val64;
1266                 array++;
1267         }
1268 
1269         if (type & PERF_SAMPLE_TIME) {
1270                 *array = sample->time;
1271                 array++;
1272         }
1273 
1274         if (type & PERF_SAMPLE_ADDR) {
1275                 *array = sample->addr;
1276                 array++;
1277         }
1278 
1279         if (type & PERF_SAMPLE_ID) {
1280                 *array = sample->id;
1281                 array++;
1282         }
1283 
1284         if (type & PERF_SAMPLE_STREAM_ID) {
1285                 *array = sample->stream_id;
1286                 array++;
1287         }
1288 
1289         if (type & PERF_SAMPLE_CPU) {
1290                 u.val32[0] = sample->cpu;
1291                 u.val32[1] = 0;
1292                 *array = u.val64;
1293                 array++;
1294         }
1295 
1296         if (type & PERF_SAMPLE_PERIOD) {
1297                 *array = sample->period;
1298                 array++;
1299         }
1300 
1301         if (type & PERF_SAMPLE_READ) {
1302                 if (read_format & PERF_FORMAT_GROUP)
1303                         *array = sample->read.group.nr;
1304                 else
1305                         *array = sample->read.one.value;
1306                 array++;
1307 
1308                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1309                         *array = sample->read.time_enabled;
1310                         array++;
1311                 }
1312 
1313                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1314                         *array = sample->read.time_running;
1315                         array++;
1316                 }
1317 
1318                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1319                 if (read_format & PERF_FORMAT_GROUP) {
1320                         sz = sample->read.group.nr *
1321                              sizeof(struct sample_read_value);
1322                         memcpy(array, sample->read.group.values, sz);
1323                         array = (void *)array + sz;
1324                 } else {
1325                         *array = sample->read.one.id;
1326                         array++;
1327                 }
1328         }
1329 
1330         if (type & PERF_SAMPLE_CALLCHAIN) {
1331                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1332                 memcpy(array, sample->callchain, sz);
1333                 array = (void *)array + sz;
1334         }
1335 
1336         if (type & PERF_SAMPLE_RAW) {
1337                 u.val32[0] = sample->raw_size;
1338                 *array = u.val64;
1339                 array = (void *)array + sizeof(u32);
1340 
1341                 memcpy(array, sample->raw_data, sample->raw_size);
1342                 array = (void *)array + sample->raw_size;
1343         }
1344 
1345         if (type & PERF_SAMPLE_BRANCH_STACK) {
1346                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1347                 sz += sizeof(u64);
1348                 memcpy(array, sample->branch_stack, sz);
1349                 array = (void *)array + sz;
1350         }
1351 
1352         if (type & PERF_SAMPLE_REGS_USER) {
1353                 if (sample->user_regs.abi) {
1354                         *array++ = sample->user_regs.abi;
1355                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1356                         memcpy(array, sample->user_regs.regs, sz);
1357                         array = (void *)array + sz;
1358                 } else {
1359                         *array++ = 0;
1360                 }
1361         }
1362 
1363         if (type & PERF_SAMPLE_STACK_USER) {
1364                 sz = sample->user_stack.size;
1365                 *array++ = sz;
1366                 if (sz) {
1367                         memcpy(array, sample->user_stack.data, sz);
1368                         array = (void *)array + sz;
1369                         *array++ = sz;
1370                 }
1371         }
1372 
1373         if (type & PERF_SAMPLE_WEIGHT) {
1374                 *array = sample->weight;
1375                 array++;
1376         }
1377 
1378         if (type & PERF_SAMPLE_DATA_SRC) {
1379                 *array = sample->data_src;
1380                 array++;
1381         }
1382 
1383         if (type & PERF_SAMPLE_TRANSACTION) {
1384                 *array = sample->transaction;
1385                 array++;
1386         }
1387 
1388         if (type & PERF_SAMPLE_REGS_INTR) {
1389                 if (sample->intr_regs.abi) {
1390                         *array++ = sample->intr_regs.abi;
1391                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1392                         memcpy(array, sample->intr_regs.regs, sz);
1393                         array = (void *)array + sz;
1394                 } else {
1395                         *array++ = 0;
1396                 }
1397         }
1398 
1399         if (type & PERF_SAMPLE_PHYS_ADDR) {
1400                 *array = sample->phys_addr;
1401                 array++;
1402         }
1403 
1404         if (type & PERF_SAMPLE_AUX) {
1405                 sz = sample->aux_sample.size;
1406                 *array++ = sz;
1407                 memcpy(array, sample->aux_sample.data, sz);
1408                 array = (void *)array + sz;
1409         }
1410 
1411         return 0;
1412 }
1413 
1414 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1415                                     struct evlist *evlist, struct machine *machine)
1416 {
1417         union perf_event *ev;
1418         struct evsel *evsel;
1419         size_t nr = 0, i = 0, sz, max_nr, n;
1420         int err;
1421 
1422         pr_debug2("Synthesizing id index\n");
1423 
1424         max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) /
1425                  sizeof(struct id_index_entry);
1426 
1427         evlist__for_each_entry(evlist, evsel)
1428                 nr += evsel->core.ids;
1429 
1430         n = nr > max_nr ? max_nr : nr;
1431         sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry);
1432         ev = zalloc(sz);
1433         if (!ev)
1434                 return -ENOMEM;
1435 
1436         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1437         ev->id_index.header.size = sz;
1438         ev->id_index.nr = n;
1439 
1440         evlist__for_each_entry(evlist, evsel) {
1441                 u32 j;
1442 
1443                 for (j = 0; j < evsel->core.ids; j++) {
1444                         struct id_index_entry *e;
1445                         struct perf_sample_id *sid;
1446 
1447                         if (i >= n) {
1448                                 err = process(tool, ev, NULL, machine);
1449                                 if (err)
1450                                         goto out_err;
1451                                 nr -= n;
1452                                 i = 0;
1453                         }
1454 
1455                         e = &ev->id_index.entries[i++];
1456 
1457                         e->id = evsel->core.id[j];
1458 
1459                         sid = perf_evlist__id2sid(evlist, e->id);
1460                         if (!sid) {
1461                                 free(ev);
1462                                 return -ENOENT;
1463                         }
1464 
1465                         e->idx = sid->idx;
1466                         e->cpu = sid->cpu;
1467                         e->tid = sid->tid;
1468                 }
1469         }
1470 
1471         sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry);
1472         ev->id_index.header.size = sz;
1473         ev->id_index.nr = nr;
1474 
1475         err = process(tool, ev, NULL, machine);
1476 out_err:
1477         free(ev);
1478 
1479         return err;
1480 }
1481 
1482 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1483                                   struct target *target, struct perf_thread_map *threads,
1484                                   perf_event__handler_t process, bool data_mmap,
1485                                   unsigned int nr_threads_synthesize)
1486 {
1487         if (target__has_task(target))
1488                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1489         else if (target__has_cpu(target))
1490                 return perf_event__synthesize_threads(tool, process,
1491                                                       machine, data_mmap,
1492                                                       nr_threads_synthesize);
1493         /* command specified */
1494         return 0;
1495 }
1496 
1497 int machine__synthesize_threads(struct machine *machine, struct target *target,
1498                                 struct perf_thread_map *threads, bool data_mmap,
1499                                 unsigned int nr_threads_synthesize)
1500 {
1501         return __machine__synthesize_threads(machine, NULL, target, threads,
1502                                              perf_event__process, data_mmap,
1503                                              nr_threads_synthesize);
1504 }
1505 
1506 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1507 {
1508         struct perf_record_event_update *ev;
1509 
1510         size += sizeof(*ev);
1511         size  = PERF_ALIGN(size, sizeof(u64));
1512 
1513         ev = zalloc(size);
1514         if (ev) {
1515                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
1516                 ev->header.size = (u16)size;
1517                 ev->type        = type;
1518                 ev->id          = id;
1519         }
1520         return ev;
1521 }
1522 
1523 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1524                                              perf_event__handler_t process)
1525 {
1526         size_t size = strlen(evsel->unit);
1527         struct perf_record_event_update *ev;
1528         int err;
1529 
1530         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1531         if (ev == NULL)
1532                 return -ENOMEM;
1533 
1534         strlcpy(ev->data, evsel->unit, size + 1);
1535         err = process(tool, (union perf_event *)ev, NULL, NULL);
1536         free(ev);
1537         return err;
1538 }
1539 
1540 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1541                                               perf_event__handler_t process)
1542 {
1543         struct perf_record_event_update *ev;
1544         struct perf_record_event_update_scale *ev_data;
1545         int err;
1546 
1547         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1548         if (ev == NULL)
1549                 return -ENOMEM;
1550 
1551         ev_data = (struct perf_record_event_update_scale *)ev->data;
1552         ev_data->scale = evsel->scale;
1553         err = process(tool, (union perf_event *)ev, NULL, NULL);
1554         free(ev);
1555         return err;
1556 }
1557 
1558 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
1559                                              perf_event__handler_t process)
1560 {
1561         struct perf_record_event_update *ev;
1562         size_t len = strlen(evsel->name);
1563         int err;
1564 
1565         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
1566         if (ev == NULL)
1567                 return -ENOMEM;
1568 
1569         strlcpy(ev->data, evsel->name, len + 1);
1570         err = process(tool, (union perf_event *)ev, NULL, NULL);
1571         free(ev);
1572         return err;
1573 }
1574 
1575 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
1576                                              perf_event__handler_t process)
1577 {
1578         size_t size = sizeof(struct perf_record_event_update);
1579         struct perf_record_event_update *ev;
1580         int max, err;
1581         u16 type;
1582 
1583         if (!evsel->core.own_cpus)
1584                 return 0;
1585 
1586         ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max);
1587         if (!ev)
1588                 return -ENOMEM;
1589 
1590         ev->header.type = PERF_RECORD_EVENT_UPDATE;
1591         ev->header.size = (u16)size;
1592         ev->type        = PERF_EVENT_UPDATE__CPUS;
1593         ev->id          = evsel->core.id[0];
1594 
1595         cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data,
1596                                  evsel->core.own_cpus, type, max);
1597 
1598         err = process(tool, (union perf_event *)ev, NULL, NULL);
1599         free(ev);
1600         return err;
1601 }
1602 
1603 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
1604                                  perf_event__handler_t process)
1605 {
1606         struct evsel *evsel;
1607         int err = 0;
1608 
1609         evlist__for_each_entry(evlist, evsel) {
1610                 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
1611                                                   evsel->core.id, process);
1612                 if (err) {
1613                         pr_debug("failed to create perf header attribute\n");
1614                         return err;
1615                 }
1616         }
1617 
1618         return err;
1619 }
1620 
1621 static bool has_unit(struct evsel *evsel)
1622 {
1623         return evsel->unit && *evsel->unit;
1624 }
1625 
1626 static bool has_scale(struct evsel *evsel)
1627 {
1628         return evsel->scale != 1;
1629 }
1630 
1631 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
1632                                       perf_event__handler_t process, bool is_pipe)
1633 {
1634         struct evsel *evsel;
1635         int err;
1636 
1637         /*
1638          * Synthesize other events stuff not carried within
1639          * attr event - unit, scale, name
1640          */
1641         evlist__for_each_entry(evsel_list, evsel) {
1642                 if (!evsel->supported)
1643                         continue;
1644 
1645                 /*
1646                  * Synthesize unit and scale only if it's defined.
1647                  */
1648                 if (has_unit(evsel)) {
1649                         err = perf_event__synthesize_event_update_unit(tool, evsel, process);
1650                         if (err < 0) {
1651                                 pr_err("Couldn't synthesize evsel unit.\n");
1652                                 return err;
1653                         }
1654                 }
1655 
1656                 if (has_scale(evsel)) {
1657                         err = perf_event__synthesize_event_update_scale(tool, evsel, process);
1658                         if (err < 0) {
1659                                 pr_err("Couldn't synthesize evsel evsel.\n");
1660                                 return err;
1661                         }
1662                 }
1663 
1664                 if (evsel->core.own_cpus) {
1665                         err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
1666                         if (err < 0) {
1667                                 pr_err("Couldn't synthesize evsel cpus.\n");
1668                                 return err;
1669                         }
1670                 }
1671 
1672                 /*
1673                  * Name is needed only for pipe output,
1674                  * perf.data carries event names.
1675                  */
1676                 if (is_pipe) {
1677                         err = perf_event__synthesize_event_update_name(tool, evsel, process);
1678                         if (err < 0) {
1679                                 pr_err("Couldn't synthesize evsel name.\n");
1680                                 return err;
1681                         }
1682                 }
1683         }
1684         return 0;
1685 }
1686 
1687 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
1688                                 u32 ids, u64 *id, perf_event__handler_t process)
1689 {
1690         union perf_event *ev;
1691         size_t size;
1692         int err;
1693 
1694         size = sizeof(struct perf_event_attr);
1695         size = PERF_ALIGN(size, sizeof(u64));
1696         size += sizeof(struct perf_event_header);
1697         size += ids * sizeof(u64);
1698 
1699         ev = zalloc(size);
1700 
1701         if (ev == NULL)
1702                 return -ENOMEM;
1703 
1704         ev->attr.attr = *attr;
1705         memcpy(ev->attr.id, id, ids * sizeof(u64));
1706 
1707         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
1708         ev->attr.header.size = (u16)size;
1709 
1710         if (ev->attr.header.size == size)
1711                 err = process(tool, ev, NULL, NULL);
1712         else
1713                 err = -E2BIG;
1714 
1715         free(ev);
1716 
1717         return err;
1718 }
1719 
1720 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
1721                                         perf_event__handler_t process)
1722 {
1723         union perf_event ev;
1724         struct tracing_data *tdata;
1725         ssize_t size = 0, aligned_size = 0, padding;
1726         struct feat_fd ff;
1727 
1728         /*
1729          * We are going to store the size of the data followed
1730          * by the data contents. Since the fd descriptor is a pipe,
1731          * we cannot seek back to store the size of the data once
1732          * we know it. Instead we:
1733          *
1734          * - write the tracing data to the temp file
1735          * - get/write the data size to pipe
1736          * - write the tracing data from the temp file
1737          *   to the pipe
1738          */
1739         tdata = tracing_data_get(&evlist->core.entries, fd, true);
1740         if (!tdata)
1741                 return -1;
1742 
1743         memset(&ev, 0, sizeof(ev));
1744 
1745         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1746         size = tdata->size;
1747         aligned_size = PERF_ALIGN(size, sizeof(u64));
1748         padding = aligned_size - size;
1749         ev.tracing_data.header.size = sizeof(ev.tracing_data);
1750         ev.tracing_data.size = aligned_size;
1751 
1752         process(tool, &ev, NULL, NULL);
1753 
1754         /*
1755          * The put function will copy all the tracing data
1756          * stored in temp file to the pipe.
1757          */
1758         tracing_data_put(tdata);
1759 
1760         ff = (struct feat_fd){ .fd = fd };
1761         if (write_padded(&ff, NULL, 0, padding))
1762                 return -1;
1763 
1764         return aligned_size;
1765 }
1766 
1767 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
1768                                     perf_event__handler_t process, struct machine *machine)
1769 {
1770         union perf_event ev;
1771         size_t len;
1772 
1773         if (!pos->hit)
1774                 return 0;
1775 
1776         memset(&ev, 0, sizeof(ev));
1777 
1778         len = pos->long_name_len + 1;
1779         len = PERF_ALIGN(len, NAME_ALIGN);
1780         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1781         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1782         ev.build_id.header.misc = misc;
1783         ev.build_id.pid = machine->pid;
1784         ev.build_id.header.size = sizeof(ev.build_id) + len;
1785         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1786 
1787         return process(tool, &ev, NULL, machine);
1788 }
1789 
1790 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
1791                                        struct evlist *evlist, perf_event__handler_t process, bool attrs)
1792 {
1793         int err;
1794 
1795         if (attrs) {
1796                 err = perf_event__synthesize_attrs(tool, evlist, process);
1797                 if (err < 0) {
1798                         pr_err("Couldn't synthesize attrs.\n");
1799                         return err;
1800                 }
1801         }
1802 
1803         err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
1804         err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
1805         if (err < 0) {
1806                 pr_err("Couldn't synthesize thread map.\n");
1807                 return err;
1808         }
1809 
1810         err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL);
1811         if (err < 0) {
1812                 pr_err("Couldn't synthesize thread map.\n");
1813                 return err;
1814         }
1815 
1816         err = perf_event__synthesize_stat_config(tool, config, process, NULL);
1817         if (err < 0) {
1818                 pr_err("Couldn't synthesize config.\n");
1819                 return err;
1820         }
1821 
1822         return 0;
1823 }
1824 
1825 int __weak perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
1826                                        struct perf_tool *tool __maybe_unused,
1827                                        perf_event__handler_t process __maybe_unused,
1828                                        struct machine *machine __maybe_unused)
1829 {
1830         return 0;
1831 }
1832 
1833 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
1834 
1835 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
1836                                     struct evlist *evlist, perf_event__handler_t process)
1837 {
1838         struct perf_header *header = &session->header;
1839         struct perf_record_header_feature *fe;
1840         struct feat_fd ff;
1841         size_t sz, sz_hdr;
1842         int feat, ret;
1843 
1844         sz_hdr = sizeof(fe->header);
1845         sz = sizeof(union perf_event);
1846         /* get a nice alignment */
1847         sz = PERF_ALIGN(sz, page_size);
1848 
1849         memset(&ff, 0, sizeof(ff));
1850 
1851         ff.buf = malloc(sz);
1852         if (!ff.buf)
1853                 return -ENOMEM;
1854 
1855         ff.size = sz - sz_hdr;
1856         ff.ph = &session->header;
1857 
1858         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
1859                 if (!feat_ops[feat].synthesize) {
1860                         pr_debug("No record header feature for header :%d\n", feat);
1861                         continue;
1862                 }
1863 
1864                 ff.offset = sizeof(*fe);
1865 
1866                 ret = feat_ops[feat].write(&ff, evlist);
1867                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
1868                         pr_debug("Error writing feature\n");
1869                         continue;
1870                 }
1871                 /* ff.buf may have changed due to realloc in do_write() */
1872                 fe = ff.buf;
1873                 memset(fe, 0, sizeof(*fe));
1874 
1875                 fe->feat_id = feat;
1876                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
1877                 fe->header.size = ff.offset;
1878 
1879                 ret = process(tool, ff.buf, NULL, NULL);
1880                 if (ret) {
1881                         free(ff.buf);
1882                         return ret;
1883                 }
1884         }
1885 
1886         /* Send HEADER_LAST_FEATURE mark. */
1887         fe = ff.buf;
1888         fe->feat_id     = HEADER_LAST_FEATURE;
1889         fe->header.type = PERF_RECORD_HEADER_FEATURE;
1890         fe->header.size = sizeof(*fe);
1891 
1892         ret = process(tool, ff.buf, NULL, NULL);
1893 
1894         free(ff.buf);
1895         return ret;
1896 }
1897 

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