perf tools: Get rid of redundant _FILE_OFFSET_BITS definition
[linux-3.10.git] / tools / perf / util / session.c
1 #include <linux/kernel.h>
2
3 #include <byteswap.h>
4 #include <unistd.h>
5 #include <sys/types.h>
6 #include <sys/mman.h>
7
8 #include "evlist.h"
9 #include "evsel.h"
10 #include "session.h"
11 #include "tool.h"
12 #include "sort.h"
13 #include "util.h"
14 #include "cpumap.h"
15 #include "event-parse.h"
16 #include "perf_regs.h"
17 #include "vdso.h"
18
19 static int perf_session__open(struct perf_session *self, bool force)
20 {
21         struct stat input_stat;
22
23         if (!strcmp(self->filename, "-")) {
24                 self->fd_pipe = true;
25                 self->fd = STDIN_FILENO;
26
27                 if (perf_session__read_header(self, self->fd) < 0)
28                         pr_err("incompatible file format (rerun with -v to learn more)");
29
30                 return 0;
31         }
32
33         self->fd = open(self->filename, O_RDONLY);
34         if (self->fd < 0) {
35                 int err = errno;
36
37                 pr_err("failed to open %s: %s", self->filename, strerror(err));
38                 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
39                         pr_err("  (try 'perf record' first)");
40                 pr_err("\n");
41                 return -errno;
42         }
43
44         if (fstat(self->fd, &input_stat) < 0)
45                 goto out_close;
46
47         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
48                 pr_err("file %s not owned by current user or root\n",
49                        self->filename);
50                 goto out_close;
51         }
52
53         if (!input_stat.st_size) {
54                 pr_info("zero-sized file (%s), nothing to do!\n",
55                         self->filename);
56                 goto out_close;
57         }
58
59         if (perf_session__read_header(self, self->fd) < 0) {
60                 pr_err("incompatible file format (rerun with -v to learn more)");
61                 goto out_close;
62         }
63
64         if (!perf_evlist__valid_sample_type(self->evlist)) {
65                 pr_err("non matching sample_type");
66                 goto out_close;
67         }
68
69         if (!perf_evlist__valid_sample_id_all(self->evlist)) {
70                 pr_err("non matching sample_id_all");
71                 goto out_close;
72         }
73
74         self->size = input_stat.st_size;
75         return 0;
76
77 out_close:
78         close(self->fd);
79         self->fd = -1;
80         return -1;
81 }
82
83 void perf_session__set_id_hdr_size(struct perf_session *session)
84 {
85         u16 id_hdr_size = perf_evlist__id_hdr_size(session->evlist);
86
87         machines__set_id_hdr_size(&session->machines, id_hdr_size);
88 }
89
90 int perf_session__create_kernel_maps(struct perf_session *self)
91 {
92         int ret = machine__create_kernel_maps(&self->machines.host);
93
94         if (ret >= 0)
95                 ret = machines__create_guest_kernel_maps(&self->machines);
96         return ret;
97 }
98
99 static void perf_session__destroy_kernel_maps(struct perf_session *self)
100 {
101         machines__destroy_kernel_maps(&self->machines);
102 }
103
104 struct perf_session *perf_session__new(const char *filename, int mode,
105                                        bool force, bool repipe,
106                                        struct perf_tool *tool)
107 {
108         struct perf_session *self;
109         struct stat st;
110         size_t len;
111
112         if (!filename || !strlen(filename)) {
113                 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
114                         filename = "-";
115                 else
116                         filename = "perf.data";
117         }
118
119         len = strlen(filename);
120         self = zalloc(sizeof(*self) + len);
121
122         if (self == NULL)
123                 goto out;
124
125         memcpy(self->filename, filename, len);
126         self->repipe = repipe;
127         INIT_LIST_HEAD(&self->ordered_samples.samples);
128         INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
129         INIT_LIST_HEAD(&self->ordered_samples.to_free);
130         machines__init(&self->machines);
131
132         if (mode == O_RDONLY) {
133                 if (perf_session__open(self, force) < 0)
134                         goto out_delete;
135                 perf_session__set_id_hdr_size(self);
136         } else if (mode == O_WRONLY) {
137                 /*
138                  * In O_RDONLY mode this will be performed when reading the
139                  * kernel MMAP event, in perf_event__process_mmap().
140                  */
141                 if (perf_session__create_kernel_maps(self) < 0)
142                         goto out_delete;
143         }
144
145         if (tool && tool->ordering_requires_timestamps &&
146             tool->ordered_samples && !perf_evlist__sample_id_all(self->evlist)) {
147                 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
148                 tool->ordered_samples = false;
149         }
150
151 out:
152         return self;
153 out_delete:
154         perf_session__delete(self);
155         return NULL;
156 }
157
158 static void perf_session__delete_dead_threads(struct perf_session *session)
159 {
160         machine__delete_dead_threads(&session->machines.host);
161 }
162
163 static void perf_session__delete_threads(struct perf_session *session)
164 {
165         machine__delete_threads(&session->machines.host);
166 }
167
168 static void perf_session_env__delete(struct perf_session_env *env)
169 {
170         free(env->hostname);
171         free(env->os_release);
172         free(env->version);
173         free(env->arch);
174         free(env->cpu_desc);
175         free(env->cpuid);
176
177         free(env->cmdline);
178         free(env->sibling_cores);
179         free(env->sibling_threads);
180         free(env->numa_nodes);
181         free(env->pmu_mappings);
182 }
183
184 void perf_session__delete(struct perf_session *self)
185 {
186         perf_session__destroy_kernel_maps(self);
187         perf_session__delete_dead_threads(self);
188         perf_session__delete_threads(self);
189         perf_session_env__delete(&self->header.env);
190         machines__exit(&self->machines);
191         close(self->fd);
192         free(self);
193         vdso__exit();
194 }
195
196 static int process_event_synth_tracing_data_stub(union perf_event *event
197                                                  __maybe_unused,
198                                                  struct perf_session *session
199                                                 __maybe_unused)
200 {
201         dump_printf(": unhandled!\n");
202         return 0;
203 }
204
205 static int process_event_synth_attr_stub(union perf_event *event __maybe_unused,
206                                          struct perf_evlist **pevlist
207                                          __maybe_unused)
208 {
209         dump_printf(": unhandled!\n");
210         return 0;
211 }
212
213 static int process_event_sample_stub(struct perf_tool *tool __maybe_unused,
214                                      union perf_event *event __maybe_unused,
215                                      struct perf_sample *sample __maybe_unused,
216                                      struct perf_evsel *evsel __maybe_unused,
217                                      struct machine *machine __maybe_unused)
218 {
219         dump_printf(": unhandled!\n");
220         return 0;
221 }
222
223 static int process_event_stub(struct perf_tool *tool __maybe_unused,
224                               union perf_event *event __maybe_unused,
225                               struct perf_sample *sample __maybe_unused,
226                               struct machine *machine __maybe_unused)
227 {
228         dump_printf(": unhandled!\n");
229         return 0;
230 }
231
232 static int process_finished_round_stub(struct perf_tool *tool __maybe_unused,
233                                        union perf_event *event __maybe_unused,
234                                        struct perf_session *perf_session
235                                        __maybe_unused)
236 {
237         dump_printf(": unhandled!\n");
238         return 0;
239 }
240
241 static int process_event_type_stub(struct perf_tool *tool __maybe_unused,
242                                    union perf_event *event __maybe_unused)
243 {
244         dump_printf(": unhandled!\n");
245         return 0;
246 }
247
248 static int process_finished_round(struct perf_tool *tool,
249                                   union perf_event *event,
250                                   struct perf_session *session);
251
252 static void perf_tool__fill_defaults(struct perf_tool *tool)
253 {
254         if (tool->sample == NULL)
255                 tool->sample = process_event_sample_stub;
256         if (tool->mmap == NULL)
257                 tool->mmap = process_event_stub;
258         if (tool->comm == NULL)
259                 tool->comm = process_event_stub;
260         if (tool->fork == NULL)
261                 tool->fork = process_event_stub;
262         if (tool->exit == NULL)
263                 tool->exit = process_event_stub;
264         if (tool->lost == NULL)
265                 tool->lost = perf_event__process_lost;
266         if (tool->read == NULL)
267                 tool->read = process_event_sample_stub;
268         if (tool->throttle == NULL)
269                 tool->throttle = process_event_stub;
270         if (tool->unthrottle == NULL)
271                 tool->unthrottle = process_event_stub;
272         if (tool->attr == NULL)
273                 tool->attr = process_event_synth_attr_stub;
274         if (tool->event_type == NULL)
275                 tool->event_type = process_event_type_stub;
276         if (tool->tracing_data == NULL)
277                 tool->tracing_data = process_event_synth_tracing_data_stub;
278         if (tool->build_id == NULL)
279                 tool->build_id = process_finished_round_stub;
280         if (tool->finished_round == NULL) {
281                 if (tool->ordered_samples)
282                         tool->finished_round = process_finished_round;
283                 else
284                         tool->finished_round = process_finished_round_stub;
285         }
286 }
287  
288 void mem_bswap_32(void *src, int byte_size)
289 {
290         u32 *m = src;
291         while (byte_size > 0) {
292                 *m = bswap_32(*m);
293                 byte_size -= sizeof(u32);
294                 ++m;
295         }
296 }
297
298 void mem_bswap_64(void *src, int byte_size)
299 {
300         u64 *m = src;
301
302         while (byte_size > 0) {
303                 *m = bswap_64(*m);
304                 byte_size -= sizeof(u64);
305                 ++m;
306         }
307 }
308
309 static void swap_sample_id_all(union perf_event *event, void *data)
310 {
311         void *end = (void *) event + event->header.size;
312         int size = end - data;
313
314         BUG_ON(size % sizeof(u64));
315         mem_bswap_64(data, size);
316 }
317
318 static void perf_event__all64_swap(union perf_event *event,
319                                    bool sample_id_all __maybe_unused)
320 {
321         struct perf_event_header *hdr = &event->header;
322         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
323 }
324
325 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
326 {
327         event->comm.pid = bswap_32(event->comm.pid);
328         event->comm.tid = bswap_32(event->comm.tid);
329
330         if (sample_id_all) {
331                 void *data = &event->comm.comm;
332
333                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
334                 swap_sample_id_all(event, data);
335         }
336 }
337
338 static void perf_event__mmap_swap(union perf_event *event,
339                                   bool sample_id_all)
340 {
341         event->mmap.pid   = bswap_32(event->mmap.pid);
342         event->mmap.tid   = bswap_32(event->mmap.tid);
343         event->mmap.start = bswap_64(event->mmap.start);
344         event->mmap.len   = bswap_64(event->mmap.len);
345         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
346
347         if (sample_id_all) {
348                 void *data = &event->mmap.filename;
349
350                 data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
351                 swap_sample_id_all(event, data);
352         }
353 }
354
355 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
356 {
357         event->fork.pid  = bswap_32(event->fork.pid);
358         event->fork.tid  = bswap_32(event->fork.tid);
359         event->fork.ppid = bswap_32(event->fork.ppid);
360         event->fork.ptid = bswap_32(event->fork.ptid);
361         event->fork.time = bswap_64(event->fork.time);
362
363         if (sample_id_all)
364                 swap_sample_id_all(event, &event->fork + 1);
365 }
366
367 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
368 {
369         event->read.pid          = bswap_32(event->read.pid);
370         event->read.tid          = bswap_32(event->read.tid);
371         event->read.value        = bswap_64(event->read.value);
372         event->read.time_enabled = bswap_64(event->read.time_enabled);
373         event->read.time_running = bswap_64(event->read.time_running);
374         event->read.id           = bswap_64(event->read.id);
375
376         if (sample_id_all)
377                 swap_sample_id_all(event, &event->read + 1);
378 }
379
380 static u8 revbyte(u8 b)
381 {
382         int rev = (b >> 4) | ((b & 0xf) << 4);
383         rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
384         rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
385         return (u8) rev;
386 }
387
388 /*
389  * XXX this is hack in attempt to carry flags bitfield
390  * throught endian village. ABI says:
391  *
392  * Bit-fields are allocated from right to left (least to most significant)
393  * on little-endian implementations and from left to right (most to least
394  * significant) on big-endian implementations.
395  *
396  * The above seems to be byte specific, so we need to reverse each
397  * byte of the bitfield. 'Internet' also says this might be implementation
398  * specific and we probably need proper fix and carry perf_event_attr
399  * bitfield flags in separate data file FEAT_ section. Thought this seems
400  * to work for now.
401  */
402 static void swap_bitfield(u8 *p, unsigned len)
403 {
404         unsigned i;
405
406         for (i = 0; i < len; i++) {
407                 *p = revbyte(*p);
408                 p++;
409         }
410 }
411
412 /* exported for swapping attributes in file header */
413 void perf_event__attr_swap(struct perf_event_attr *attr)
414 {
415         attr->type              = bswap_32(attr->type);
416         attr->size              = bswap_32(attr->size);
417         attr->config            = bswap_64(attr->config);
418         attr->sample_period     = bswap_64(attr->sample_period);
419         attr->sample_type       = bswap_64(attr->sample_type);
420         attr->read_format       = bswap_64(attr->read_format);
421         attr->wakeup_events     = bswap_32(attr->wakeup_events);
422         attr->bp_type           = bswap_32(attr->bp_type);
423         attr->bp_addr           = bswap_64(attr->bp_addr);
424         attr->bp_len            = bswap_64(attr->bp_len);
425
426         swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64));
427 }
428
429 static void perf_event__hdr_attr_swap(union perf_event *event,
430                                       bool sample_id_all __maybe_unused)
431 {
432         size_t size;
433
434         perf_event__attr_swap(&event->attr.attr);
435
436         size = event->header.size;
437         size -= (void *)&event->attr.id - (void *)event;
438         mem_bswap_64(event->attr.id, size);
439 }
440
441 static void perf_event__event_type_swap(union perf_event *event,
442                                         bool sample_id_all __maybe_unused)
443 {
444         event->event_type.event_type.event_id =
445                 bswap_64(event->event_type.event_type.event_id);
446 }
447
448 static void perf_event__tracing_data_swap(union perf_event *event,
449                                           bool sample_id_all __maybe_unused)
450 {
451         event->tracing_data.size = bswap_32(event->tracing_data.size);
452 }
453
454 typedef void (*perf_event__swap_op)(union perf_event *event,
455                                     bool sample_id_all);
456
457 static perf_event__swap_op perf_event__swap_ops[] = {
458         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
459         [PERF_RECORD_COMM]                = perf_event__comm_swap,
460         [PERF_RECORD_FORK]                = perf_event__task_swap,
461         [PERF_RECORD_EXIT]                = perf_event__task_swap,
462         [PERF_RECORD_LOST]                = perf_event__all64_swap,
463         [PERF_RECORD_READ]                = perf_event__read_swap,
464         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
465         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
466         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
467         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
468         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
469         [PERF_RECORD_HEADER_MAX]          = NULL,
470 };
471
472 struct sample_queue {
473         u64                     timestamp;
474         u64                     file_offset;
475         union perf_event        *event;
476         struct list_head        list;
477 };
478
479 static void perf_session_free_sample_buffers(struct perf_session *session)
480 {
481         struct ordered_samples *os = &session->ordered_samples;
482
483         while (!list_empty(&os->to_free)) {
484                 struct sample_queue *sq;
485
486                 sq = list_entry(os->to_free.next, struct sample_queue, list);
487                 list_del(&sq->list);
488                 free(sq);
489         }
490 }
491
492 static int perf_session_deliver_event(struct perf_session *session,
493                                       union perf_event *event,
494                                       struct perf_sample *sample,
495                                       struct perf_tool *tool,
496                                       u64 file_offset);
497
498 static int flush_sample_queue(struct perf_session *s,
499                                struct perf_tool *tool)
500 {
501         struct ordered_samples *os = &s->ordered_samples;
502         struct list_head *head = &os->samples;
503         struct sample_queue *tmp, *iter;
504         struct perf_sample sample;
505         u64 limit = os->next_flush;
506         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
507         unsigned idx = 0, progress_next = os->nr_samples / 16;
508         int ret;
509
510         if (!tool->ordered_samples || !limit)
511                 return 0;
512
513         list_for_each_entry_safe(iter, tmp, head, list) {
514                 if (iter->timestamp > limit)
515                         break;
516
517                 ret = perf_evlist__parse_sample(s->evlist, iter->event, &sample);
518                 if (ret)
519                         pr_err("Can't parse sample, err = %d\n", ret);
520                 else {
521                         ret = perf_session_deliver_event(s, iter->event, &sample, tool,
522                                                          iter->file_offset);
523                         if (ret)
524                                 return ret;
525                 }
526
527                 os->last_flush = iter->timestamp;
528                 list_del(&iter->list);
529                 list_add(&iter->list, &os->sample_cache);
530                 if (++idx >= progress_next) {
531                         progress_next += os->nr_samples / 16;
532                         ui_progress__update(idx, os->nr_samples,
533                                             "Processing time ordered events...");
534                 }
535         }
536
537         if (list_empty(head)) {
538                 os->last_sample = NULL;
539         } else if (last_ts <= limit) {
540                 os->last_sample =
541                         list_entry(head->prev, struct sample_queue, list);
542         }
543
544         os->nr_samples = 0;
545
546         return 0;
547 }
548
549 /*
550  * When perf record finishes a pass on every buffers, it records this pseudo
551  * event.
552  * We record the max timestamp t found in the pass n.
553  * Assuming these timestamps are monotonic across cpus, we know that if
554  * a buffer still has events with timestamps below t, they will be all
555  * available and then read in the pass n + 1.
556  * Hence when we start to read the pass n + 2, we can safely flush every
557  * events with timestamps below t.
558  *
559  *    ============ PASS n =================
560  *       CPU 0         |   CPU 1
561  *                     |
562  *    cnt1 timestamps  |   cnt2 timestamps
563  *          1          |         2
564  *          2          |         3
565  *          -          |         4  <--- max recorded
566  *
567  *    ============ PASS n + 1 ==============
568  *       CPU 0         |   CPU 1
569  *                     |
570  *    cnt1 timestamps  |   cnt2 timestamps
571  *          3          |         5
572  *          4          |         6
573  *          5          |         7 <---- max recorded
574  *
575  *      Flush every events below timestamp 4
576  *
577  *    ============ PASS n + 2 ==============
578  *       CPU 0         |   CPU 1
579  *                     |
580  *    cnt1 timestamps  |   cnt2 timestamps
581  *          6          |         8
582  *          7          |         9
583  *          -          |         10
584  *
585  *      Flush every events below timestamp 7
586  *      etc...
587  */
588 static int process_finished_round(struct perf_tool *tool,
589                                   union perf_event *event __maybe_unused,
590                                   struct perf_session *session)
591 {
592         int ret = flush_sample_queue(session, tool);
593         if (!ret)
594                 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
595
596         return ret;
597 }
598
599 /* The queue is ordered by time */
600 static void __queue_event(struct sample_queue *new, struct perf_session *s)
601 {
602         struct ordered_samples *os = &s->ordered_samples;
603         struct sample_queue *sample = os->last_sample;
604         u64 timestamp = new->timestamp;
605         struct list_head *p;
606
607         ++os->nr_samples;
608         os->last_sample = new;
609
610         if (!sample) {
611                 list_add(&new->list, &os->samples);
612                 os->max_timestamp = timestamp;
613                 return;
614         }
615
616         /*
617          * last_sample might point to some random place in the list as it's
618          * the last queued event. We expect that the new event is close to
619          * this.
620          */
621         if (sample->timestamp <= timestamp) {
622                 while (sample->timestamp <= timestamp) {
623                         p = sample->list.next;
624                         if (p == &os->samples) {
625                                 list_add_tail(&new->list, &os->samples);
626                                 os->max_timestamp = timestamp;
627                                 return;
628                         }
629                         sample = list_entry(p, struct sample_queue, list);
630                 }
631                 list_add_tail(&new->list, &sample->list);
632         } else {
633                 while (sample->timestamp > timestamp) {
634                         p = sample->list.prev;
635                         if (p == &os->samples) {
636                                 list_add(&new->list, &os->samples);
637                                 return;
638                         }
639                         sample = list_entry(p, struct sample_queue, list);
640                 }
641                 list_add(&new->list, &sample->list);
642         }
643 }
644
645 #define MAX_SAMPLE_BUFFER       (64 * 1024 / sizeof(struct sample_queue))
646
647 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
648                                     struct perf_sample *sample, u64 file_offset)
649 {
650         struct ordered_samples *os = &s->ordered_samples;
651         struct list_head *sc = &os->sample_cache;
652         u64 timestamp = sample->time;
653         struct sample_queue *new;
654
655         if (!timestamp || timestamp == ~0ULL)
656                 return -ETIME;
657
658         if (timestamp < s->ordered_samples.last_flush) {
659                 printf("Warning: Timestamp below last timeslice flush\n");
660                 return -EINVAL;
661         }
662
663         if (!list_empty(sc)) {
664                 new = list_entry(sc->next, struct sample_queue, list);
665                 list_del(&new->list);
666         } else if (os->sample_buffer) {
667                 new = os->sample_buffer + os->sample_buffer_idx;
668                 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
669                         os->sample_buffer = NULL;
670         } else {
671                 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
672                 if (!os->sample_buffer)
673                         return -ENOMEM;
674                 list_add(&os->sample_buffer->list, &os->to_free);
675                 os->sample_buffer_idx = 2;
676                 new = os->sample_buffer + 1;
677         }
678
679         new->timestamp = timestamp;
680         new->file_offset = file_offset;
681         new->event = event;
682
683         __queue_event(new, s);
684
685         return 0;
686 }
687
688 static void callchain__printf(struct perf_sample *sample)
689 {
690         unsigned int i;
691
692         printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
693
694         for (i = 0; i < sample->callchain->nr; i++)
695                 printf("..... %2d: %016" PRIx64 "\n",
696                        i, sample->callchain->ips[i]);
697 }
698
699 static void branch_stack__printf(struct perf_sample *sample)
700 {
701         uint64_t i;
702
703         printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
704
705         for (i = 0; i < sample->branch_stack->nr; i++)
706                 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
707                         i, sample->branch_stack->entries[i].from,
708                         sample->branch_stack->entries[i].to);
709 }
710
711 static void regs_dump__printf(u64 mask, u64 *regs)
712 {
713         unsigned rid, i = 0;
714
715         for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
716                 u64 val = regs[i++];
717
718                 printf(".... %-5s 0x%" PRIx64 "\n",
719                        perf_reg_name(rid), val);
720         }
721 }
722
723 static void regs_user__printf(struct perf_sample *sample, u64 mask)
724 {
725         struct regs_dump *user_regs = &sample->user_regs;
726
727         if (user_regs->regs) {
728                 printf("... user regs: mask 0x%" PRIx64 "\n", mask);
729                 regs_dump__printf(mask, user_regs->regs);
730         }
731 }
732
733 static void stack_user__printf(struct stack_dump *dump)
734 {
735         printf("... ustack: size %" PRIu64 ", offset 0x%x\n",
736                dump->size, dump->offset);
737 }
738
739 static void perf_session__print_tstamp(struct perf_session *session,
740                                        union perf_event *event,
741                                        struct perf_sample *sample)
742 {
743         u64 sample_type = perf_evlist__sample_type(session->evlist);
744
745         if (event->header.type != PERF_RECORD_SAMPLE &&
746             !perf_evlist__sample_id_all(session->evlist)) {
747                 fputs("-1 -1 ", stdout);
748                 return;
749         }
750
751         if ((sample_type & PERF_SAMPLE_CPU))
752                 printf("%u ", sample->cpu);
753
754         if (sample_type & PERF_SAMPLE_TIME)
755                 printf("%" PRIu64 " ", sample->time);
756 }
757
758 static void dump_event(struct perf_session *session, union perf_event *event,
759                        u64 file_offset, struct perf_sample *sample)
760 {
761         if (!dump_trace)
762                 return;
763
764         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
765                file_offset, event->header.size, event->header.type);
766
767         trace_event(event);
768
769         if (sample)
770                 perf_session__print_tstamp(session, event, sample);
771
772         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
773                event->header.size, perf_event__name(event->header.type));
774 }
775
776 static void dump_sample(struct perf_evsel *evsel, union perf_event *event,
777                         struct perf_sample *sample)
778 {
779         u64 sample_type;
780
781         if (!dump_trace)
782                 return;
783
784         printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
785                event->header.misc, sample->pid, sample->tid, sample->ip,
786                sample->period, sample->addr);
787
788         sample_type = evsel->attr.sample_type;
789
790         if (sample_type & PERF_SAMPLE_CALLCHAIN)
791                 callchain__printf(sample);
792
793         if (sample_type & PERF_SAMPLE_BRANCH_STACK)
794                 branch_stack__printf(sample);
795
796         if (sample_type & PERF_SAMPLE_REGS_USER)
797                 regs_user__printf(sample, evsel->attr.sample_regs_user);
798
799         if (sample_type & PERF_SAMPLE_STACK_USER)
800                 stack_user__printf(&sample->user_stack);
801 }
802
803 static struct machine *
804         perf_session__find_machine_for_cpumode(struct perf_session *session,
805                                                union perf_event *event)
806 {
807         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
808
809         if (perf_guest &&
810             ((cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ||
811              (cpumode == PERF_RECORD_MISC_GUEST_USER))) {
812                 u32 pid;
813
814                 if (event->header.type == PERF_RECORD_MMAP)
815                         pid = event->mmap.pid;
816                 else
817                         pid = event->ip.pid;
818
819                 return perf_session__findnew_machine(session, pid);
820         }
821
822         return &session->machines.host;
823 }
824
825 static int perf_session_deliver_event(struct perf_session *session,
826                                       union perf_event *event,
827                                       struct perf_sample *sample,
828                                       struct perf_tool *tool,
829                                       u64 file_offset)
830 {
831         struct perf_evsel *evsel;
832         struct machine *machine;
833
834         dump_event(session, event, file_offset, sample);
835
836         evsel = perf_evlist__id2evsel(session->evlist, sample->id);
837         if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
838                 /*
839                  * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
840                  * because the tools right now may apply filters, discarding
841                  * some of the samples. For consistency, in the future we
842                  * should have something like nr_filtered_samples and remove
843                  * the sample->period from total_sample_period, etc, KISS for
844                  * now tho.
845                  *
846                  * Also testing against NULL allows us to handle files without
847                  * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
848                  * future probably it'll be a good idea to restrict event
849                  * processing via perf_session to files with both set.
850                  */
851                 hists__inc_nr_events(&evsel->hists, event->header.type);
852         }
853
854         machine = perf_session__find_machine_for_cpumode(session, event);
855
856         switch (event->header.type) {
857         case PERF_RECORD_SAMPLE:
858                 dump_sample(evsel, event, sample);
859                 if (evsel == NULL) {
860                         ++session->stats.nr_unknown_id;
861                         return 0;
862                 }
863                 if (machine == NULL) {
864                         ++session->stats.nr_unprocessable_samples;
865                         return 0;
866                 }
867                 return tool->sample(tool, event, sample, evsel, machine);
868         case PERF_RECORD_MMAP:
869                 return tool->mmap(tool, event, sample, machine);
870         case PERF_RECORD_COMM:
871                 return tool->comm(tool, event, sample, machine);
872         case PERF_RECORD_FORK:
873                 return tool->fork(tool, event, sample, machine);
874         case PERF_RECORD_EXIT:
875                 return tool->exit(tool, event, sample, machine);
876         case PERF_RECORD_LOST:
877                 if (tool->lost == perf_event__process_lost)
878                         session->stats.total_lost += event->lost.lost;
879                 return tool->lost(tool, event, sample, machine);
880         case PERF_RECORD_READ:
881                 return tool->read(tool, event, sample, evsel, machine);
882         case PERF_RECORD_THROTTLE:
883                 return tool->throttle(tool, event, sample, machine);
884         case PERF_RECORD_UNTHROTTLE:
885                 return tool->unthrottle(tool, event, sample, machine);
886         default:
887                 ++session->stats.nr_unknown_events;
888                 return -1;
889         }
890 }
891
892 static int perf_session__preprocess_sample(struct perf_session *session,
893                                            union perf_event *event, struct perf_sample *sample)
894 {
895         if (event->header.type != PERF_RECORD_SAMPLE ||
896             !(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_CALLCHAIN))
897                 return 0;
898
899         if (!ip_callchain__valid(sample->callchain, event)) {
900                 pr_debug("call-chain problem with event, skipping it.\n");
901                 ++session->stats.nr_invalid_chains;
902                 session->stats.total_invalid_chains += sample->period;
903                 return -EINVAL;
904         }
905         return 0;
906 }
907
908 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
909                                             struct perf_tool *tool, u64 file_offset)
910 {
911         int err;
912
913         dump_event(session, event, file_offset, NULL);
914
915         /* These events are processed right away */
916         switch (event->header.type) {
917         case PERF_RECORD_HEADER_ATTR:
918                 err = tool->attr(event, &session->evlist);
919                 if (err == 0)
920                         perf_session__set_id_hdr_size(session);
921                 return err;
922         case PERF_RECORD_HEADER_EVENT_TYPE:
923                 return tool->event_type(tool, event);
924         case PERF_RECORD_HEADER_TRACING_DATA:
925                 /* setup for reading amidst mmap */
926                 lseek(session->fd, file_offset, SEEK_SET);
927                 return tool->tracing_data(event, session);
928         case PERF_RECORD_HEADER_BUILD_ID:
929                 return tool->build_id(tool, event, session);
930         case PERF_RECORD_FINISHED_ROUND:
931                 return tool->finished_round(tool, event, session);
932         default:
933                 return -EINVAL;
934         }
935 }
936
937 static void event_swap(union perf_event *event, bool sample_id_all)
938 {
939         perf_event__swap_op swap;
940
941         swap = perf_event__swap_ops[event->header.type];
942         if (swap)
943                 swap(event, sample_id_all);
944 }
945
946 static int perf_session__process_event(struct perf_session *session,
947                                        union perf_event *event,
948                                        struct perf_tool *tool,
949                                        u64 file_offset)
950 {
951         struct perf_sample sample;
952         int ret;
953
954         if (session->header.needs_swap)
955                 event_swap(event, perf_evlist__sample_id_all(session->evlist));
956
957         if (event->header.type >= PERF_RECORD_HEADER_MAX)
958                 return -EINVAL;
959
960         events_stats__inc(&session->stats, event->header.type);
961
962         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
963                 return perf_session__process_user_event(session, event, tool, file_offset);
964
965         /*
966          * For all kernel events we get the sample data
967          */
968         ret = perf_evlist__parse_sample(session->evlist, event, &sample);
969         if (ret)
970                 return ret;
971
972         /* Preprocess sample records - precheck callchains */
973         if (perf_session__preprocess_sample(session, event, &sample))
974                 return 0;
975
976         if (tool->ordered_samples) {
977                 ret = perf_session_queue_event(session, event, &sample,
978                                                file_offset);
979                 if (ret != -ETIME)
980                         return ret;
981         }
982
983         return perf_session_deliver_event(session, event, &sample, tool,
984                                           file_offset);
985 }
986
987 void perf_event_header__bswap(struct perf_event_header *self)
988 {
989         self->type = bswap_32(self->type);
990         self->misc = bswap_16(self->misc);
991         self->size = bswap_16(self->size);
992 }
993
994 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
995 {
996         return machine__findnew_thread(&session->machines.host, pid);
997 }
998
999 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
1000 {
1001         struct thread *thread = perf_session__findnew(self, 0);
1002
1003         if (thread == NULL || thread__set_comm(thread, "swapper")) {
1004                 pr_err("problem inserting idle task.\n");
1005                 thread = NULL;
1006         }
1007
1008         return thread;
1009 }
1010
1011 static void perf_session__warn_about_errors(const struct perf_session *session,
1012                                             const struct perf_tool *tool)
1013 {
1014         if (tool->lost == perf_event__process_lost &&
1015             session->stats.nr_events[PERF_RECORD_LOST] != 0) {
1016                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1017                             "Check IO/CPU overload!\n\n",
1018                             session->stats.nr_events[0],
1019                             session->stats.nr_events[PERF_RECORD_LOST]);
1020         }
1021
1022         if (session->stats.nr_unknown_events != 0) {
1023                 ui__warning("Found %u unknown events!\n\n"
1024                             "Is this an older tool processing a perf.data "
1025                             "file generated by a more recent tool?\n\n"
1026                             "If that is not the case, consider "
1027                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1028                             session->stats.nr_unknown_events);
1029         }
1030
1031         if (session->stats.nr_unknown_id != 0) {
1032                 ui__warning("%u samples with id not present in the header\n",
1033                             session->stats.nr_unknown_id);
1034         }
1035
1036         if (session->stats.nr_invalid_chains != 0) {
1037                 ui__warning("Found invalid callchains!\n\n"
1038                             "%u out of %u events were discarded for this reason.\n\n"
1039                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1040                             session->stats.nr_invalid_chains,
1041                             session->stats.nr_events[PERF_RECORD_SAMPLE]);
1042         }
1043
1044         if (session->stats.nr_unprocessable_samples != 0) {
1045                 ui__warning("%u unprocessable samples recorded.\n"
1046                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1047                             session->stats.nr_unprocessable_samples);
1048         }
1049 }
1050
1051 #define session_done()  (*(volatile int *)(&session_done))
1052 volatile int session_done;
1053
1054 static int __perf_session__process_pipe_events(struct perf_session *self,
1055                                                struct perf_tool *tool)
1056 {
1057         union perf_event *event;
1058         uint32_t size, cur_size = 0;
1059         void *buf = NULL;
1060         int skip = 0;
1061         u64 head;
1062         int err;
1063         void *p;
1064
1065         perf_tool__fill_defaults(tool);
1066
1067         head = 0;
1068         cur_size = sizeof(union perf_event);
1069
1070         buf = malloc(cur_size);
1071         if (!buf)
1072                 return -errno;
1073 more:
1074         event = buf;
1075         err = readn(self->fd, event, sizeof(struct perf_event_header));
1076         if (err <= 0) {
1077                 if (err == 0)
1078                         goto done;
1079
1080                 pr_err("failed to read event header\n");
1081                 goto out_err;
1082         }
1083
1084         if (self->header.needs_swap)
1085                 perf_event_header__bswap(&event->header);
1086
1087         size = event->header.size;
1088         if (size == 0)
1089                 size = 8;
1090
1091         if (size > cur_size) {
1092                 void *new = realloc(buf, size);
1093                 if (!new) {
1094                         pr_err("failed to allocate memory to read event\n");
1095                         goto out_err;
1096                 }
1097                 buf = new;
1098                 cur_size = size;
1099                 event = buf;
1100         }
1101         p = event;
1102         p += sizeof(struct perf_event_header);
1103
1104         if (size - sizeof(struct perf_event_header)) {
1105                 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
1106                 if (err <= 0) {
1107                         if (err == 0) {
1108                                 pr_err("unexpected end of event stream\n");
1109                                 goto done;
1110                         }
1111
1112                         pr_err("failed to read event data\n");
1113                         goto out_err;
1114                 }
1115         }
1116
1117         if ((skip = perf_session__process_event(self, event, tool, head)) < 0) {
1118                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1119                        head, event->header.size, event->header.type);
1120                 err = -EINVAL;
1121                 goto out_err;
1122         }
1123
1124         head += size;
1125
1126         if (skip > 0)
1127                 head += skip;
1128
1129         if (!session_done())
1130                 goto more;
1131 done:
1132         err = 0;
1133 out_err:
1134         free(buf);
1135         perf_session__warn_about_errors(self, tool);
1136         perf_session_free_sample_buffers(self);
1137         return err;
1138 }
1139
1140 static union perf_event *
1141 fetch_mmaped_event(struct perf_session *session,
1142                    u64 head, size_t mmap_size, char *buf)
1143 {
1144         union perf_event *event;
1145
1146         /*
1147          * Ensure we have enough space remaining to read
1148          * the size of the event in the headers.
1149          */
1150         if (head + sizeof(event->header) > mmap_size)
1151                 return NULL;
1152
1153         event = (union perf_event *)(buf + head);
1154
1155         if (session->header.needs_swap)
1156                 perf_event_header__bswap(&event->header);
1157
1158         if (head + event->header.size > mmap_size)
1159                 return NULL;
1160
1161         return event;
1162 }
1163
1164 /*
1165  * On 64bit we can mmap the data file in one go. No need for tiny mmap
1166  * slices. On 32bit we use 32MB.
1167  */
1168 #if BITS_PER_LONG == 64
1169 #define MMAP_SIZE ULLONG_MAX
1170 #define NUM_MMAPS 1
1171 #else
1172 #define MMAP_SIZE (32 * 1024 * 1024ULL)
1173 #define NUM_MMAPS 128
1174 #endif
1175
1176 int __perf_session__process_events(struct perf_session *session,
1177                                    u64 data_offset, u64 data_size,
1178                                    u64 file_size, struct perf_tool *tool)
1179 {
1180         u64 head, page_offset, file_offset, file_pos, progress_next;
1181         int err, mmap_prot, mmap_flags, map_idx = 0;
1182         size_t  mmap_size;
1183         char *buf, *mmaps[NUM_MMAPS];
1184         union perf_event *event;
1185         uint32_t size;
1186
1187         perf_tool__fill_defaults(tool);
1188
1189         page_offset = page_size * (data_offset / page_size);
1190         file_offset = page_offset;
1191         head = data_offset - page_offset;
1192
1193         if (data_offset + data_size < file_size)
1194                 file_size = data_offset + data_size;
1195
1196         progress_next = file_size / 16;
1197
1198         mmap_size = MMAP_SIZE;
1199         if (mmap_size > file_size)
1200                 mmap_size = file_size;
1201
1202         memset(mmaps, 0, sizeof(mmaps));
1203
1204         mmap_prot  = PROT_READ;
1205         mmap_flags = MAP_SHARED;
1206
1207         if (session->header.needs_swap) {
1208                 mmap_prot  |= PROT_WRITE;
1209                 mmap_flags = MAP_PRIVATE;
1210         }
1211 remap:
1212         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1213                    file_offset);
1214         if (buf == MAP_FAILED) {
1215                 pr_err("failed to mmap file\n");
1216                 err = -errno;
1217                 goto out_err;
1218         }
1219         mmaps[map_idx] = buf;
1220         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1221         file_pos = file_offset + head;
1222
1223 more:
1224         event = fetch_mmaped_event(session, head, mmap_size, buf);
1225         if (!event) {
1226                 if (mmaps[map_idx]) {
1227                         munmap(mmaps[map_idx], mmap_size);
1228                         mmaps[map_idx] = NULL;
1229                 }
1230
1231                 page_offset = page_size * (head / page_size);
1232                 file_offset += page_offset;
1233                 head -= page_offset;
1234                 goto remap;
1235         }
1236
1237         size = event->header.size;
1238
1239         if (size == 0 ||
1240             perf_session__process_event(session, event, tool, file_pos) < 0) {
1241                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1242                        file_offset + head, event->header.size,
1243                        event->header.type);
1244                 err = -EINVAL;
1245                 goto out_err;
1246         }
1247
1248         head += size;
1249         file_pos += size;
1250
1251         if (file_pos >= progress_next) {
1252                 progress_next += file_size / 16;
1253                 ui_progress__update(file_pos, file_size,
1254                                     "Processing events...");
1255         }
1256
1257         if (file_pos < file_size)
1258                 goto more;
1259
1260         err = 0;
1261         /* do the final flush for ordered samples */
1262         session->ordered_samples.next_flush = ULLONG_MAX;
1263         err = flush_sample_queue(session, tool);
1264 out_err:
1265         ui_progress__finish();
1266         perf_session__warn_about_errors(session, tool);
1267         perf_session_free_sample_buffers(session);
1268         return err;
1269 }
1270
1271 int perf_session__process_events(struct perf_session *self,
1272                                  struct perf_tool *tool)
1273 {
1274         int err;
1275
1276         if (perf_session__register_idle_thread(self) == NULL)
1277                 return -ENOMEM;
1278
1279         if (!self->fd_pipe)
1280                 err = __perf_session__process_events(self,
1281                                                      self->header.data_offset,
1282                                                      self->header.data_size,
1283                                                      self->size, tool);
1284         else
1285                 err = __perf_session__process_pipe_events(self, tool);
1286
1287         return err;
1288 }
1289
1290 bool perf_session__has_traces(struct perf_session *session, const char *msg)
1291 {
1292         if (!(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_RAW)) {
1293                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1294                 return false;
1295         }
1296
1297         return true;
1298 }
1299
1300 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1301                                      const char *symbol_name, u64 addr)
1302 {
1303         char *bracket;
1304         enum map_type i;
1305         struct ref_reloc_sym *ref;
1306
1307         ref = zalloc(sizeof(struct ref_reloc_sym));
1308         if (ref == NULL)
1309                 return -ENOMEM;
1310
1311         ref->name = strdup(symbol_name);
1312         if (ref->name == NULL) {
1313                 free(ref);
1314                 return -ENOMEM;
1315         }
1316
1317         bracket = strchr(ref->name, ']');
1318         if (bracket)
1319                 *bracket = '\0';
1320
1321         ref->addr = addr;
1322
1323         for (i = 0; i < MAP__NR_TYPES; ++i) {
1324                 struct kmap *kmap = map__kmap(maps[i]);
1325                 kmap->ref_reloc_sym = ref;
1326         }
1327
1328         return 0;
1329 }
1330
1331 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1332 {
1333         return machines__fprintf_dsos(&self->machines, fp);
1334 }
1335
1336 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1337                                           bool (skip)(struct dso *dso, int parm), int parm)
1338 {
1339         return machines__fprintf_dsos_buildid(&self->machines, fp, skip, parm);
1340 }
1341
1342 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1343 {
1344         struct perf_evsel *pos;
1345         size_t ret = fprintf(fp, "Aggregated stats:\n");
1346
1347         ret += events_stats__fprintf(&session->stats, fp);
1348
1349         list_for_each_entry(pos, &session->evlist->entries, node) {
1350                 ret += fprintf(fp, "%s stats:\n", perf_evsel__name(pos));
1351                 ret += events_stats__fprintf(&pos->hists.stats, fp);
1352         }
1353
1354         return ret;
1355 }
1356
1357 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1358 {
1359         /*
1360          * FIXME: Here we have to actually print all the machines in this
1361          * session, not just the host...
1362          */
1363         return machine__fprintf(&session->machines.host, fp);
1364 }
1365
1366 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1367                                               unsigned int type)
1368 {
1369         struct perf_evsel *pos;
1370
1371         list_for_each_entry(pos, &session->evlist->entries, node) {
1372                 if (pos->attr.type == type)
1373                         return pos;
1374         }
1375         return NULL;
1376 }
1377
1378 void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
1379                           struct perf_sample *sample, struct machine *machine,
1380                           int print_sym, int print_dso, int print_symoffset)
1381 {
1382         struct addr_location al;
1383         struct callchain_cursor_node *node;
1384
1385         if (perf_event__preprocess_sample(event, machine, &al, sample,
1386                                           NULL) < 0) {
1387                 error("problem processing %d event, skipping it.\n",
1388                         event->header.type);
1389                 return;
1390         }
1391
1392         if (symbol_conf.use_callchain && sample->callchain) {
1393
1394
1395                 if (machine__resolve_callchain(machine, evsel, al.thread,
1396                                                sample, NULL) != 0) {
1397                         if (verbose)
1398                                 error("Failed to resolve callchain. Skipping\n");
1399                         return;
1400                 }
1401                 callchain_cursor_commit(&callchain_cursor);
1402
1403                 while (1) {
1404                         node = callchain_cursor_current(&callchain_cursor);
1405                         if (!node)
1406                                 break;
1407
1408                         printf("\t%16" PRIx64, node->ip);
1409                         if (print_sym) {
1410                                 printf(" ");
1411                                 symbol__fprintf_symname(node->sym, stdout);
1412                         }
1413                         if (print_dso) {
1414                                 printf(" (");
1415                                 map__fprintf_dsoname(node->map, stdout);
1416                                 printf(")");
1417                         }
1418                         printf("\n");
1419
1420                         callchain_cursor_advance(&callchain_cursor);
1421                 }
1422
1423         } else {
1424                 printf("%16" PRIx64, sample->ip);
1425                 if (print_sym) {
1426                         printf(" ");
1427                         if (print_symoffset)
1428                                 symbol__fprintf_symname_offs(al.sym, &al,
1429                                                              stdout);
1430                         else
1431                                 symbol__fprintf_symname(al.sym, stdout);
1432                 }
1433
1434                 if (print_dso) {
1435                         printf(" (");
1436                         map__fprintf_dsoname(al.map, stdout);
1437                         printf(")");
1438                 }
1439         }
1440 }
1441
1442 int perf_session__cpu_bitmap(struct perf_session *session,
1443                              const char *cpu_list, unsigned long *cpu_bitmap)
1444 {
1445         int i;
1446         struct cpu_map *map;
1447
1448         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1449                 struct perf_evsel *evsel;
1450
1451                 evsel = perf_session__find_first_evtype(session, i);
1452                 if (!evsel)
1453                         continue;
1454
1455                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1456                         pr_err("File does not contain CPU events. "
1457                                "Remove -c option to proceed.\n");
1458                         return -1;
1459                 }
1460         }
1461
1462         map = cpu_map__new(cpu_list);
1463         if (map == NULL) {
1464                 pr_err("Invalid cpu_list\n");
1465                 return -1;
1466         }
1467
1468         for (i = 0; i < map->nr; i++) {
1469                 int cpu = map->map[i];
1470
1471                 if (cpu >= MAX_NR_CPUS) {
1472                         pr_err("Requested CPU %d too large. "
1473                                "Consider raising MAX_NR_CPUS\n", cpu);
1474                         return -1;
1475                 }
1476
1477                 set_bit(cpu, cpu_bitmap);
1478         }
1479
1480         return 0;
1481 }
1482
1483 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1484                                 bool full)
1485 {
1486         struct stat st;
1487         int ret;
1488
1489         if (session == NULL || fp == NULL)
1490                 return;
1491
1492         ret = fstat(session->fd, &st);
1493         if (ret == -1)
1494                 return;
1495
1496         fprintf(fp, "# ========\n");
1497         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1498         perf_header__fprintf_info(session, fp, full);
1499         fprintf(fp, "# ========\n#\n");
1500 }
1501
1502
1503 int __perf_session__set_tracepoints_handlers(struct perf_session *session,
1504                                              const struct perf_evsel_str_handler *assocs,
1505                                              size_t nr_assocs)
1506 {
1507         struct perf_evlist *evlist = session->evlist;
1508         struct event_format *format;
1509         struct perf_evsel *evsel;
1510         char *tracepoint, *name;
1511         size_t i;
1512         int err;
1513
1514         for (i = 0; i < nr_assocs; i++) {
1515                 err = -ENOMEM;
1516                 tracepoint = strdup(assocs[i].name);
1517                 if (tracepoint == NULL)
1518                         goto out;
1519
1520                 err = -ENOENT;
1521                 name = strchr(tracepoint, ':');
1522                 if (name == NULL)
1523                         goto out_free;
1524
1525                 *name++ = '\0';
1526                 format = pevent_find_event_by_name(session->pevent,
1527                                                    tracepoint, name);
1528                 if (format == NULL) {
1529                         /*
1530                          * Adding a handler for an event not in the session,
1531                          * just ignore it.
1532                          */
1533                         goto next;
1534                 }
1535
1536                 evsel = perf_evlist__find_tracepoint_by_id(evlist, format->id);
1537                 if (evsel == NULL)
1538                         goto next;
1539
1540                 err = -EEXIST;
1541                 if (evsel->handler.func != NULL)
1542                         goto out_free;
1543                 evsel->handler.func = assocs[i].handler;
1544 next:
1545                 free(tracepoint);
1546         }
1547
1548         err = 0;
1549 out:
1550         return err;
1551
1552 out_free:
1553         free(tracepoint);
1554         goto out;
1555 }