1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright(C) 2015 Linaro Limited. All rights reserved.
4 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
5 */
6
7 #include <api/fs/fs.h>
8 #include <linux/bitops.h>
9 #include <linux/compiler.h>
10 #include <linux/coresight-pmu.h>
11 #include <linux/kernel.h>
12 #include <linux/log2.h>
13 #include <linux/types.h>
14
15 #include "cs-etm.h"
16 #include "../../perf.h"
17 #include "../../util/auxtrace.h"
18 #include "../../util/cpumap.h"
19 #include "../../util/evlist.h"
20 #include "../../util/evsel.h"
21 #include "../../util/pmu.h"
22 #include "../../util/thread_map.h"
23 #include "../../util/cs-etm.h"
24
25 #include <stdlib.h>
26 #include <sys/stat.h>
27
28 #define ENABLE_SINK_MAX 128
29 #define CS_BUS_DEVICE_PATH "/bus/coresight/devices/"
30
31 struct cs_etm_recording {
32 struct auxtrace_record itr;
33 struct perf_pmu *cs_etm_pmu;
34 struct perf_evlist *evlist;
35 bool snapshot_mode;
36 size_t snapshot_size;
37 };
38
39 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu);
40
cs_etm_parse_snapshot_options(struct auxtrace_record * itr,struct record_opts * opts,const char * str)41 static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr,
42 struct record_opts *opts,
43 const char *str)
44 {
45 struct cs_etm_recording *ptr =
46 container_of(itr, struct cs_etm_recording, itr);
47 unsigned long long snapshot_size = 0;
48 char *endptr;
49
50 if (str) {
51 snapshot_size = strtoull(str, &endptr, 0);
52 if (*endptr || snapshot_size > SIZE_MAX)
53 return -1;
54 }
55
56 opts->auxtrace_snapshot_mode = true;
57 opts->auxtrace_snapshot_size = snapshot_size;
58 ptr->snapshot_size = snapshot_size;
59
60 return 0;
61 }
62
cs_etm_recording_options(struct auxtrace_record * itr,struct perf_evlist * evlist,struct record_opts * opts)63 static int cs_etm_recording_options(struct auxtrace_record *itr,
64 struct perf_evlist *evlist,
65 struct record_opts *opts)
66 {
67 struct cs_etm_recording *ptr =
68 container_of(itr, struct cs_etm_recording, itr);
69 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
70 struct perf_evsel *evsel, *cs_etm_evsel = NULL;
71 const struct cpu_map *cpus = evlist->cpus;
72 bool privileged = (geteuid() == 0 || perf_event_paranoid() < 0);
73
74 ptr->evlist = evlist;
75 ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
76
77 evlist__for_each_entry(evlist, evsel) {
78 if (evsel->attr.type == cs_etm_pmu->type) {
79 if (cs_etm_evsel) {
80 pr_err("There may be only one %s event\n",
81 CORESIGHT_ETM_PMU_NAME);
82 return -EINVAL;
83 }
84 evsel->attr.freq = 0;
85 evsel->attr.sample_period = 1;
86 cs_etm_evsel = evsel;
87 opts->full_auxtrace = true;
88 }
89 }
90
91 /* no need to continue if at least one event of interest was found */
92 if (!cs_etm_evsel)
93 return 0;
94
95 if (opts->use_clockid) {
96 pr_err("Cannot use clockid (-k option) with %s\n",
97 CORESIGHT_ETM_PMU_NAME);
98 return -EINVAL;
99 }
100
101 /* we are in snapshot mode */
102 if (opts->auxtrace_snapshot_mode) {
103 /*
104 * No size were given to '-S' or '-m,', so go with
105 * the default
106 */
107 if (!opts->auxtrace_snapshot_size &&
108 !opts->auxtrace_mmap_pages) {
109 if (privileged) {
110 opts->auxtrace_mmap_pages = MiB(4) / page_size;
111 } else {
112 opts->auxtrace_mmap_pages =
113 KiB(128) / page_size;
114 if (opts->mmap_pages == UINT_MAX)
115 opts->mmap_pages = KiB(256) / page_size;
116 }
117 } else if (!opts->auxtrace_mmap_pages && !privileged &&
118 opts->mmap_pages == UINT_MAX) {
119 opts->mmap_pages = KiB(256) / page_size;
120 }
121
122 /*
123 * '-m,xyz' was specified but no snapshot size, so make the
124 * snapshot size as big as the auxtrace mmap area.
125 */
126 if (!opts->auxtrace_snapshot_size) {
127 opts->auxtrace_snapshot_size =
128 opts->auxtrace_mmap_pages * (size_t)page_size;
129 }
130
131 /*
132 * -Sxyz was specified but no auxtrace mmap area, so make the
133 * auxtrace mmap area big enough to fit the requested snapshot
134 * size.
135 */
136 if (!opts->auxtrace_mmap_pages) {
137 size_t sz = opts->auxtrace_snapshot_size;
138
139 sz = round_up(sz, page_size) / page_size;
140 opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
141 }
142
143 /* Snapshost size can't be bigger than the auxtrace area */
144 if (opts->auxtrace_snapshot_size >
145 opts->auxtrace_mmap_pages * (size_t)page_size) {
146 pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
147 opts->auxtrace_snapshot_size,
148 opts->auxtrace_mmap_pages * (size_t)page_size);
149 return -EINVAL;
150 }
151
152 /* Something went wrong somewhere - this shouldn't happen */
153 if (!opts->auxtrace_snapshot_size ||
154 !opts->auxtrace_mmap_pages) {
155 pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
156 return -EINVAL;
157 }
158 }
159
160 /* We are in full trace mode but '-m,xyz' wasn't specified */
161 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
162 if (privileged) {
163 opts->auxtrace_mmap_pages = MiB(4) / page_size;
164 } else {
165 opts->auxtrace_mmap_pages = KiB(128) / page_size;
166 if (opts->mmap_pages == UINT_MAX)
167 opts->mmap_pages = KiB(256) / page_size;
168 }
169
170 }
171
172 /* Validate auxtrace_mmap_pages provided by user */
173 if (opts->auxtrace_mmap_pages) {
174 unsigned int max_page = (KiB(128) / page_size);
175 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
176
177 if (!privileged &&
178 opts->auxtrace_mmap_pages > max_page) {
179 opts->auxtrace_mmap_pages = max_page;
180 pr_err("auxtrace too big, truncating to %d\n",
181 max_page);
182 }
183
184 if (!is_power_of_2(sz)) {
185 pr_err("Invalid mmap size for %s: must be a power of 2\n",
186 CORESIGHT_ETM_PMU_NAME);
187 return -EINVAL;
188 }
189 }
190
191 if (opts->auxtrace_snapshot_mode)
192 pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME,
193 opts->auxtrace_snapshot_size);
194
195 /*
196 * To obtain the auxtrace buffer file descriptor, the auxtrace
197 * event must come first.
198 */
199 perf_evlist__to_front(evlist, cs_etm_evsel);
200
201 /*
202 * In the case of per-cpu mmaps, we need the CPU on the
203 * AUX event.
204 */
205 if (!cpu_map__empty(cpus))
206 perf_evsel__set_sample_bit(cs_etm_evsel, CPU);
207
208 /* Add dummy event to keep tracking */
209 if (opts->full_auxtrace) {
210 struct perf_evsel *tracking_evsel;
211 int err;
212
213 err = parse_events(evlist, "dummy:u", NULL);
214 if (err)
215 return err;
216
217 tracking_evsel = perf_evlist__last(evlist);
218 perf_evlist__set_tracking_event(evlist, tracking_evsel);
219
220 tracking_evsel->attr.freq = 0;
221 tracking_evsel->attr.sample_period = 1;
222
223 /* In per-cpu case, always need the time of mmap events etc */
224 if (!cpu_map__empty(cpus))
225 perf_evsel__set_sample_bit(tracking_evsel, TIME);
226 }
227
228 return 0;
229 }
230
cs_etm_get_config(struct auxtrace_record * itr)231 static u64 cs_etm_get_config(struct auxtrace_record *itr)
232 {
233 u64 config = 0;
234 struct cs_etm_recording *ptr =
235 container_of(itr, struct cs_etm_recording, itr);
236 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
237 struct perf_evlist *evlist = ptr->evlist;
238 struct perf_evsel *evsel;
239
240 evlist__for_each_entry(evlist, evsel) {
241 if (evsel->attr.type == cs_etm_pmu->type) {
242 /*
243 * Variable perf_event_attr::config is assigned to
244 * ETMv3/PTM. The bit fields have been made to match
245 * the ETMv3.5 ETRMCR register specification. See the
246 * PMU_FORMAT_ATTR() declarations in
247 * drivers/hwtracing/coresight/coresight-perf.c for
248 * details.
249 */
250 config = evsel->attr.config;
251 break;
252 }
253 }
254
255 return config;
256 }
257
258 #ifndef BIT
259 #define BIT(N) (1UL << (N))
260 #endif
261
cs_etmv4_get_config(struct auxtrace_record * itr)262 static u64 cs_etmv4_get_config(struct auxtrace_record *itr)
263 {
264 u64 config = 0;
265 u64 config_opts = 0;
266
267 /*
268 * The perf event variable config bits represent both
269 * the command line options and register programming
270 * bits in ETMv3/PTM. For ETMv4 we must remap options
271 * to real bits
272 */
273 config_opts = cs_etm_get_config(itr);
274 if (config_opts & BIT(ETM_OPT_CYCACC))
275 config |= BIT(ETM4_CFG_BIT_CYCACC);
276 if (config_opts & BIT(ETM_OPT_TS))
277 config |= BIT(ETM4_CFG_BIT_TS);
278 if (config_opts & BIT(ETM_OPT_RETSTK))
279 config |= BIT(ETM4_CFG_BIT_RETSTK);
280
281 return config;
282 }
283
284 static size_t
cs_etm_info_priv_size(struct auxtrace_record * itr __maybe_unused,struct perf_evlist * evlist __maybe_unused)285 cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused,
286 struct perf_evlist *evlist __maybe_unused)
287 {
288 int i;
289 int etmv3 = 0, etmv4 = 0;
290 struct cpu_map *event_cpus = evlist->cpus;
291 struct cpu_map *online_cpus = cpu_map__new(NULL);
292
293 /* cpu map is not empty, we have specific CPUs to work with */
294 if (!cpu_map__empty(event_cpus)) {
295 for (i = 0; i < cpu__max_cpu(); i++) {
296 if (!cpu_map__has(event_cpus, i) ||
297 !cpu_map__has(online_cpus, i))
298 continue;
299
300 if (cs_etm_is_etmv4(itr, i))
301 etmv4++;
302 else
303 etmv3++;
304 }
305 } else {
306 /* get configuration for all CPUs in the system */
307 for (i = 0; i < cpu__max_cpu(); i++) {
308 if (!cpu_map__has(online_cpus, i))
309 continue;
310
311 if (cs_etm_is_etmv4(itr, i))
312 etmv4++;
313 else
314 etmv3++;
315 }
316 }
317
318 cpu_map__put(online_cpus);
319
320 return (CS_ETM_HEADER_SIZE +
321 (etmv4 * CS_ETMV4_PRIV_SIZE) +
322 (etmv3 * CS_ETMV3_PRIV_SIZE));
323 }
324
325 static const char *metadata_etmv3_ro[CS_ETM_PRIV_MAX] = {
326 [CS_ETM_ETMCCER] = "mgmt/etmccer",
327 [CS_ETM_ETMIDR] = "mgmt/etmidr",
328 };
329
330 static const char *metadata_etmv4_ro[CS_ETMV4_PRIV_MAX] = {
331 [CS_ETMV4_TRCIDR0] = "trcidr/trcidr0",
332 [CS_ETMV4_TRCIDR1] = "trcidr/trcidr1",
333 [CS_ETMV4_TRCIDR2] = "trcidr/trcidr2",
334 [CS_ETMV4_TRCIDR8] = "trcidr/trcidr8",
335 [CS_ETMV4_TRCAUTHSTATUS] = "mgmt/trcauthstatus",
336 };
337
cs_etm_is_etmv4(struct auxtrace_record * itr,int cpu)338 static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu)
339 {
340 bool ret = false;
341 char path[PATH_MAX];
342 int scan;
343 unsigned int val;
344 struct cs_etm_recording *ptr =
345 container_of(itr, struct cs_etm_recording, itr);
346 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
347
348 /* Take any of the RO files for ETMv4 and see if it present */
349 snprintf(path, PATH_MAX, "cpu%d/%s",
350 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
351 scan = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);
352
353 /* The file was read successfully, we have a winner */
354 if (scan == 1)
355 ret = true;
356
357 return ret;
358 }
359
cs_etm_get_ro(struct perf_pmu * pmu,int cpu,const char * path)360 static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path)
361 {
362 char pmu_path[PATH_MAX];
363 int scan;
364 unsigned int val = 0;
365
366 /* Get RO metadata from sysfs */
367 snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path);
368
369 scan = perf_pmu__scan_file(pmu, pmu_path, "%x", &val);
370 if (scan != 1)
371 pr_err("%s: error reading: %s\n", __func__, pmu_path);
372
373 return val;
374 }
375
cs_etm_get_metadata(int cpu,u32 * offset,struct auxtrace_record * itr,struct auxtrace_info_event * info)376 static void cs_etm_get_metadata(int cpu, u32 *offset,
377 struct auxtrace_record *itr,
378 struct auxtrace_info_event *info)
379 {
380 u32 increment;
381 u64 magic;
382 struct cs_etm_recording *ptr =
383 container_of(itr, struct cs_etm_recording, itr);
384 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
385
386 /* first see what kind of tracer this cpu is affined to */
387 if (cs_etm_is_etmv4(itr, cpu)) {
388 magic = __perf_cs_etmv4_magic;
389 /* Get trace configuration register */
390 info->priv[*offset + CS_ETMV4_TRCCONFIGR] =
391 cs_etmv4_get_config(itr);
392 /* Get traceID from the framework */
393 info->priv[*offset + CS_ETMV4_TRCTRACEIDR] =
394 coresight_get_trace_id(cpu);
395 /* Get read-only information from sysFS */
396 info->priv[*offset + CS_ETMV4_TRCIDR0] =
397 cs_etm_get_ro(cs_etm_pmu, cpu,
398 metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
399 info->priv[*offset + CS_ETMV4_TRCIDR1] =
400 cs_etm_get_ro(cs_etm_pmu, cpu,
401 metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
402 info->priv[*offset + CS_ETMV4_TRCIDR2] =
403 cs_etm_get_ro(cs_etm_pmu, cpu,
404 metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
405 info->priv[*offset + CS_ETMV4_TRCIDR8] =
406 cs_etm_get_ro(cs_etm_pmu, cpu,
407 metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
408 info->priv[*offset + CS_ETMV4_TRCAUTHSTATUS] =
409 cs_etm_get_ro(cs_etm_pmu, cpu,
410 metadata_etmv4_ro
411 [CS_ETMV4_TRCAUTHSTATUS]);
412
413 /* How much space was used */
414 increment = CS_ETMV4_PRIV_MAX;
415 } else {
416 magic = __perf_cs_etmv3_magic;
417 /* Get configuration register */
418 info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr);
419 /* Get traceID from the framework */
420 info->priv[*offset + CS_ETM_ETMTRACEIDR] =
421 coresight_get_trace_id(cpu);
422 /* Get read-only information from sysFS */
423 info->priv[*offset + CS_ETM_ETMCCER] =
424 cs_etm_get_ro(cs_etm_pmu, cpu,
425 metadata_etmv3_ro[CS_ETM_ETMCCER]);
426 info->priv[*offset + CS_ETM_ETMIDR] =
427 cs_etm_get_ro(cs_etm_pmu, cpu,
428 metadata_etmv3_ro[CS_ETM_ETMIDR]);
429
430 /* How much space was used */
431 increment = CS_ETM_PRIV_MAX;
432 }
433
434 /* Build generic header portion */
435 info->priv[*offset + CS_ETM_MAGIC] = magic;
436 info->priv[*offset + CS_ETM_CPU] = cpu;
437 /* Where the next CPU entry should start from */
438 *offset += increment;
439 }
440
cs_etm_info_fill(struct auxtrace_record * itr,struct perf_session * session,struct auxtrace_info_event * info,size_t priv_size)441 static int cs_etm_info_fill(struct auxtrace_record *itr,
442 struct perf_session *session,
443 struct auxtrace_info_event *info,
444 size_t priv_size)
445 {
446 int i;
447 u32 offset;
448 u64 nr_cpu, type;
449 struct cpu_map *cpu_map;
450 struct cpu_map *event_cpus = session->evlist->cpus;
451 struct cpu_map *online_cpus = cpu_map__new(NULL);
452 struct cs_etm_recording *ptr =
453 container_of(itr, struct cs_etm_recording, itr);
454 struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
455
456 if (priv_size != cs_etm_info_priv_size(itr, session->evlist))
457 return -EINVAL;
458
459 if (!session->evlist->nr_mmaps)
460 return -EINVAL;
461
462 /* If the cpu_map is empty all online CPUs are involved */
463 if (cpu_map__empty(event_cpus)) {
464 cpu_map = online_cpus;
465 } else {
466 /* Make sure all specified CPUs are online */
467 for (i = 0; i < cpu_map__nr(event_cpus); i++) {
468 if (cpu_map__has(event_cpus, i) &&
469 !cpu_map__has(online_cpus, i))
470 return -EINVAL;
471 }
472
473 cpu_map = event_cpus;
474 }
475
476 nr_cpu = cpu_map__nr(cpu_map);
477 /* Get PMU type as dynamically assigned by the core */
478 type = cs_etm_pmu->type;
479
480 /* First fill out the session header */
481 info->type = PERF_AUXTRACE_CS_ETM;
482 info->priv[CS_HEADER_VERSION_0] = 0;
483 info->priv[CS_PMU_TYPE_CPUS] = type << 32;
484 info->priv[CS_PMU_TYPE_CPUS] |= nr_cpu;
485 info->priv[CS_ETM_SNAPSHOT] = ptr->snapshot_mode;
486
487 offset = CS_ETM_SNAPSHOT + 1;
488
489 for (i = 0; i < cpu__max_cpu() && offset < priv_size; i++)
490 if (cpu_map__has(cpu_map, i))
491 cs_etm_get_metadata(i, &offset, itr, info);
492
493 cpu_map__put(online_cpus);
494
495 return 0;
496 }
497
cs_etm_find_snapshot(struct auxtrace_record * itr __maybe_unused,int idx,struct auxtrace_mmap * mm,unsigned char * data __maybe_unused,u64 * head,u64 * old)498 static int cs_etm_find_snapshot(struct auxtrace_record *itr __maybe_unused,
499 int idx, struct auxtrace_mmap *mm,
500 unsigned char *data __maybe_unused,
501 u64 *head, u64 *old)
502 {
503 pr_debug3("%s: mmap index %d old head %zu new head %zu size %zu\n",
504 __func__, idx, (size_t)*old, (size_t)*head, mm->len);
505
506 *old = *head;
507 *head += mm->len;
508
509 return 0;
510 }
511
cs_etm_snapshot_start(struct auxtrace_record * itr)512 static int cs_etm_snapshot_start(struct auxtrace_record *itr)
513 {
514 struct cs_etm_recording *ptr =
515 container_of(itr, struct cs_etm_recording, itr);
516 struct perf_evsel *evsel;
517
518 evlist__for_each_entry(ptr->evlist, evsel) {
519 if (evsel->attr.type == ptr->cs_etm_pmu->type)
520 return perf_evsel__disable(evsel);
521 }
522 return -EINVAL;
523 }
524
cs_etm_snapshot_finish(struct auxtrace_record * itr)525 static int cs_etm_snapshot_finish(struct auxtrace_record *itr)
526 {
527 struct cs_etm_recording *ptr =
528 container_of(itr, struct cs_etm_recording, itr);
529 struct perf_evsel *evsel;
530
531 evlist__for_each_entry(ptr->evlist, evsel) {
532 if (evsel->attr.type == ptr->cs_etm_pmu->type)
533 return perf_evsel__enable(evsel);
534 }
535 return -EINVAL;
536 }
537
cs_etm_reference(struct auxtrace_record * itr __maybe_unused)538 static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused)
539 {
540 return (((u64) rand() << 0) & 0x00000000FFFFFFFFull) |
541 (((u64) rand() << 32) & 0xFFFFFFFF00000000ull);
542 }
543
cs_etm_recording_free(struct auxtrace_record * itr)544 static void cs_etm_recording_free(struct auxtrace_record *itr)
545 {
546 struct cs_etm_recording *ptr =
547 container_of(itr, struct cs_etm_recording, itr);
548 free(ptr);
549 }
550
cs_etm_read_finish(struct auxtrace_record * itr,int idx)551 static int cs_etm_read_finish(struct auxtrace_record *itr, int idx)
552 {
553 struct cs_etm_recording *ptr =
554 container_of(itr, struct cs_etm_recording, itr);
555 struct perf_evsel *evsel;
556
557 evlist__for_each_entry(ptr->evlist, evsel) {
558 if (evsel->attr.type == ptr->cs_etm_pmu->type)
559 return perf_evlist__enable_event_idx(ptr->evlist,
560 evsel, idx);
561 }
562
563 return -EINVAL;
564 }
565
cs_etm_record_init(int * err)566 struct auxtrace_record *cs_etm_record_init(int *err)
567 {
568 struct perf_pmu *cs_etm_pmu;
569 struct cs_etm_recording *ptr;
570
571 cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
572
573 if (!cs_etm_pmu) {
574 *err = -EINVAL;
575 goto out;
576 }
577
578 ptr = zalloc(sizeof(struct cs_etm_recording));
579 if (!ptr) {
580 *err = -ENOMEM;
581 goto out;
582 }
583
584 ptr->cs_etm_pmu = cs_etm_pmu;
585 ptr->itr.parse_snapshot_options = cs_etm_parse_snapshot_options;
586 ptr->itr.recording_options = cs_etm_recording_options;
587 ptr->itr.info_priv_size = cs_etm_info_priv_size;
588 ptr->itr.info_fill = cs_etm_info_fill;
589 ptr->itr.find_snapshot = cs_etm_find_snapshot;
590 ptr->itr.snapshot_start = cs_etm_snapshot_start;
591 ptr->itr.snapshot_finish = cs_etm_snapshot_finish;
592 ptr->itr.reference = cs_etm_reference;
593 ptr->itr.free = cs_etm_recording_free;
594 ptr->itr.read_finish = cs_etm_read_finish;
595
596 *err = 0;
597 return &ptr->itr;
598 out:
599 return NULL;
600 }
601
cs_device__open_file(const char * name)602 static FILE *cs_device__open_file(const char *name)
603 {
604 struct stat st;
605 char path[PATH_MAX];
606 const char *sysfs;
607
608 sysfs = sysfs__mountpoint();
609 if (!sysfs)
610 return NULL;
611
612 snprintf(path, PATH_MAX,
613 "%s" CS_BUS_DEVICE_PATH "%s", sysfs, name);
614
615 if (stat(path, &st) < 0)
616 return NULL;
617
618 return fopen(path, "w");
619
620 }
621
cs_device__print_file(const char * name,const char * fmt,...)622 static int __printf(2, 3) cs_device__print_file(const char *name, const char *fmt, ...)
623 {
624 va_list args;
625 FILE *file;
626 int ret = -EINVAL;
627
628 va_start(args, fmt);
629 file = cs_device__open_file(name);
630 if (file) {
631 ret = vfprintf(file, fmt, args);
632 fclose(file);
633 }
634 va_end(args);
635 return ret;
636 }
637
cs_etm_set_drv_config(struct perf_evsel_config_term * term)638 int cs_etm_set_drv_config(struct perf_evsel_config_term *term)
639 {
640 int ret;
641 char enable_sink[ENABLE_SINK_MAX];
642
643 snprintf(enable_sink, ENABLE_SINK_MAX, "%s/%s",
644 term->val.drv_cfg, "enable_sink");
645
646 ret = cs_device__print_file(enable_sink, "%d", 1);
647 if (ret < 0)
648 return ret;
649
650 return 0;
651 }
652
