summaryrefslogtreecommitdiff
path: root/tools/lib/perf/evsel.c
blob: 8441e3e1aaac3ece838985c076738f99a30f1087 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <perf/evsel.h>
#include <perf/cpumap.h>
#include <perf/threadmap.h>
#include <linux/list.h>
#include <internal/evsel.h>
#include <linux/zalloc.h>
#include <stdlib.h>
#include <internal/xyarray.h>
#include <internal/cpumap.h>
#include <internal/mmap.h>
#include <internal/threadmap.h>
#include <internal/lib.h>
#include <linux/string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <asm/bug.h>

void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
		      int idx)
{
	INIT_LIST_HEAD(&evsel->node);
	evsel->attr = *attr;
	evsel->idx  = idx;
	evsel->leader = evsel;
}

struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr)
{
	struct perf_evsel *evsel = zalloc(sizeof(*evsel));

	if (evsel != NULL)
		perf_evsel__init(evsel, attr, 0);

	return evsel;
}

void perf_evsel__delete(struct perf_evsel *evsel)
{
	free(evsel);
}

#define FD(e, x, y) ((int *) xyarray__entry(e->fd, x, y))
#define MMAP(e, x, y) (e->mmap ? ((struct perf_mmap *) xyarray__entry(e->mmap, x, y)) : NULL)

int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
{
	evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));

	if (evsel->fd) {
		int cpu, thread;
		for (cpu = 0; cpu < ncpus; cpu++) {
			for (thread = 0; thread < nthreads; thread++) {
				int *fd = FD(evsel, cpu, thread);

				if (fd)
					*fd = -1;
			}
		}
	}

	return evsel->fd != NULL ? 0 : -ENOMEM;
}

static int perf_evsel__alloc_mmap(struct perf_evsel *evsel, int ncpus, int nthreads)
{
	evsel->mmap = xyarray__new(ncpus, nthreads, sizeof(struct perf_mmap));

	return evsel->mmap != NULL ? 0 : -ENOMEM;
}

static int
sys_perf_event_open(struct perf_event_attr *attr,
		    pid_t pid, int cpu, int group_fd,
		    unsigned long flags)
{
	return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
}

static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread, int *group_fd)
{
	struct perf_evsel *leader = evsel->leader;
	int *fd;

	if (evsel == leader) {
		*group_fd = -1;
		return 0;
	}

	/*
	 * Leader must be already processed/open,
	 * if not it's a bug.
	 */
	if (!leader->fd)
		return -ENOTCONN;

	fd = FD(leader, cpu, thread);
	if (fd == NULL || *fd == -1)
		return -EBADF;

	*group_fd = *fd;

	return 0;
}

int perf_evsel__open(struct perf_evsel *evsel, struct perf_cpu_map *cpus,
		     struct perf_thread_map *threads)
{
	int cpu, thread, err = 0;

	if (cpus == NULL) {
		static struct perf_cpu_map *empty_cpu_map;

		if (empty_cpu_map == NULL) {
			empty_cpu_map = perf_cpu_map__dummy_new();
			if (empty_cpu_map == NULL)
				return -ENOMEM;
		}

		cpus = empty_cpu_map;
	}

	if (threads == NULL) {
		static struct perf_thread_map *empty_thread_map;

		if (empty_thread_map == NULL) {
			empty_thread_map = perf_thread_map__new_dummy();
			if (empty_thread_map == NULL)
				return -ENOMEM;
		}

		threads = empty_thread_map;
	}

	if (evsel->fd == NULL &&
	    perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
		return -ENOMEM;

	for (cpu = 0; cpu < cpus->nr; cpu++) {
		for (thread = 0; thread < threads->nr; thread++) {
			int fd, group_fd, *evsel_fd;

			evsel_fd = FD(evsel, cpu, thread);
			if (evsel_fd == NULL)
				return -EINVAL;

			err = get_group_fd(evsel, cpu, thread, &group_fd);
			if (err < 0)
				return err;

			fd = sys_perf_event_open(&evsel->attr,
						 threads->map[thread].pid,
						 cpus->map[cpu], group_fd, 0);

			if (fd < 0)
				return -errno;

			*evsel_fd = fd;
		}
	}

	return err;
}

static void perf_evsel__close_fd_cpu(struct perf_evsel *evsel, int cpu)
{
	int thread;

	for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
		int *fd = FD(evsel, cpu, thread);

		if (fd && *fd >= 0) {
			close(*fd);
			*fd = -1;
		}
	}
}

void perf_evsel__close_fd(struct perf_evsel *evsel)
{
	int cpu;

	for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
		perf_evsel__close_fd_cpu(evsel, cpu);
}

void perf_evsel__free_fd(struct perf_evsel *evsel)
{
	xyarray__delete(evsel->fd);
	evsel->fd = NULL;
}

void perf_evsel__close(struct perf_evsel *evsel)
{
	if (evsel->fd == NULL)
		return;

	perf_evsel__close_fd(evsel);
	perf_evsel__free_fd(evsel);
}

void perf_evsel__close_cpu(struct perf_evsel *evsel, int cpu)
{
	if (evsel->fd == NULL)
		return;

	perf_evsel__close_fd_cpu(evsel, cpu);
}

void perf_evsel__munmap(struct perf_evsel *evsel)
{
	int cpu, thread;

	if (evsel->fd == NULL || evsel->mmap == NULL)
		return;

	for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
		for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
			int *fd = FD(evsel, cpu, thread);

			if (fd == NULL || *fd < 0)
				continue;

			perf_mmap__munmap(MMAP(evsel, cpu, thread));
		}
	}

	xyarray__delete(evsel->mmap);
	evsel->mmap = NULL;
}

int perf_evsel__mmap(struct perf_evsel *evsel, int pages)
{
	int ret, cpu, thread;
	struct perf_mmap_param mp = {
		.prot = PROT_READ | PROT_WRITE,
		.mask = (pages * page_size) - 1,
	};

	if (evsel->fd == NULL || evsel->mmap)
		return -EINVAL;

	if (perf_evsel__alloc_mmap(evsel, xyarray__max_x(evsel->fd), xyarray__max_y(evsel->fd)) < 0)
		return -ENOMEM;

	for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
		for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
			int *fd = FD(evsel, cpu, thread);
			struct perf_mmap *map;

			if (fd == NULL || *fd < 0)
				continue;

			map = MMAP(evsel, cpu, thread);
			perf_mmap__init(map, NULL, false, NULL);

			ret = perf_mmap__mmap(map, &mp, *fd, cpu);
			if (ret) {
				perf_evsel__munmap(evsel);
				return ret;
			}
		}
	}

	return 0;
}

void *perf_evsel__mmap_base(struct perf_evsel *evsel, int cpu, int thread)
{
	int *fd = FD(evsel, cpu, thread);

	if (fd == NULL || *fd < 0 || MMAP(evsel, cpu, thread) == NULL)
		return NULL;

	return MMAP(evsel, cpu, thread)->base;
}

int perf_evsel__read_size(struct perf_evsel *evsel)
{
	u64 read_format = evsel->attr.read_format;
	int entry = sizeof(u64); /* value */
	int size = 0;
	int nr = 1;

	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
		size += sizeof(u64);

	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
		size += sizeof(u64);

	if (read_format & PERF_FORMAT_ID)
		entry += sizeof(u64);

	if (read_format & PERF_FORMAT_GROUP) {
		nr = evsel->nr_members;
		size += sizeof(u64);
	}

	size += entry * nr;
	return size;
}

int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
		     struct perf_counts_values *count)
{
	size_t size = perf_evsel__read_size(evsel);
	int *fd = FD(evsel, cpu, thread);

	memset(count, 0, sizeof(*count));

	if (fd == NULL || *fd < 0)
		return -EINVAL;

	if (MMAP(evsel, cpu, thread) &&
	    !perf_mmap__read_self(MMAP(evsel, cpu, thread), count))
		return 0;

	if (readn(*fd, count->values, size) <= 0)
		return -errno;

	return 0;
}

static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
				 int ioc,  void *arg,
				 int cpu)
{
	int thread;

	for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
		int err;
		int *fd = FD(evsel, cpu, thread);

		if (fd == NULL || *fd < 0)
			return -1;

		err = ioctl(*fd, ioc, arg);

		if (err)
			return err;
	}

	return 0;
}

int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu)
{
	return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu);
}

int perf_evsel__enable(struct perf_evsel *evsel)
{
	int i;
	int err = 0;

	for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
		err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, i);
	return err;
}

int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu)
{
	return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, cpu);
}

int perf_evsel__disable(struct perf_evsel *evsel)
{
	int i;
	int err = 0;

	for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
		err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, i);
	return err;
}

int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
{
	int err = 0, i;

	for (i = 0; i < evsel->cpus->nr && !err; i++)
		err = perf_evsel__run_ioctl(evsel,
				     PERF_EVENT_IOC_SET_FILTER,
				     (void *)filter, i);
	return err;
}

struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel)
{
	return evsel->cpus;
}

struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel)
{
	return evsel->threads;
}

struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel)
{
	return &evsel->attr;
}

int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
{
	if (ncpus == 0 || nthreads == 0)
		return 0;

	if (evsel->system_wide)
		nthreads = 1;

	evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
	if (evsel->sample_id == NULL)
		return -ENOMEM;

	evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
	if (evsel->id == NULL) {
		xyarray__delete(evsel->sample_id);
		evsel->sample_id = NULL;
		return -ENOMEM;
	}

	return 0;
}

void perf_evsel__free_id(struct perf_evsel *evsel)
{
	xyarray__delete(evsel->sample_id);
	evsel->sample_id = NULL;
	zfree(&evsel->id);
	evsel->ids = 0;
}