summaryrefslogtreecommitdiffstats
path: root/tools/perf/arch/arm/util/cs-etm.c
blob: 7ce3d1a2513378b5e0ec8d01040364d6ddc3b5a6 (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
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
/*
 * Copyright(C) 2015 Linaro Limited. All rights reserved.
 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <api/fs/fs.h>
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/coresight-pmu.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/types.h>

#include "cs-etm.h"
#include "../../perf.h"
#include "../../util/auxtrace.h"
#include "../../util/cpumap.h"
#include "../../util/evlist.h"
#include "../../util/evsel.h"
#include "../../util/pmu.h"
#include "../../util/thread_map.h"
#include "../../util/cs-etm.h"

#include <stdlib.h>
#include <sys/stat.h>

#define ENABLE_SINK_MAX	128
#define CS_BUS_DEVICE_PATH "/bus/coresight/devices/"

struct cs_etm_recording {
	struct auxtrace_record	itr;
	struct perf_pmu		*cs_etm_pmu;
	struct perf_evlist	*evlist;
	bool			snapshot_mode;
	size_t			snapshot_size;
};

static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu);

static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr,
					 struct record_opts *opts,
					 const char *str)
{
	struct cs_etm_recording *ptr =
				container_of(itr, struct cs_etm_recording, itr);
	unsigned long long snapshot_size = 0;
	char *endptr;

	if (str) {
		snapshot_size = strtoull(str, &endptr, 0);
		if (*endptr || snapshot_size > SIZE_MAX)
			return -1;
	}

	opts->auxtrace_snapshot_mode = true;
	opts->auxtrace_snapshot_size = snapshot_size;
	ptr->snapshot_size = snapshot_size;

	return 0;
}

static int cs_etm_recording_options(struct auxtrace_record *itr,
				    struct perf_evlist *evlist,
				    struct record_opts *opts)
{
	struct cs_etm_recording *ptr =
				container_of(itr, struct cs_etm_recording, itr);
	struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
	struct perf_evsel *evsel, *cs_etm_evsel = NULL;
	const struct cpu_map *cpus = evlist->cpus;
	bool privileged = (geteuid() == 0 || perf_event_paranoid() < 0);

	ptr->evlist = evlist;
	ptr->snapshot_mode = opts->auxtrace_snapshot_mode;

	evlist__for_each_entry(evlist, evsel) {
		if (evsel->attr.type == cs_etm_pmu->type) {
			if (cs_etm_evsel) {
				pr_err("There may be only one %s event\n",
				       CORESIGHT_ETM_PMU_NAME);
				return -EINVAL;
			}
			evsel->attr.freq = 0;
			evsel->attr.sample_period = 1;
			cs_etm_evsel = evsel;
			opts->full_auxtrace = true;
		}
	}

	/* no need to continue if at least one event of interest was found */
	if (!cs_etm_evsel)
		return 0;

	if (opts->use_clockid) {
		pr_err("Cannot use clockid (-k option) with %s\n",
		       CORESIGHT_ETM_PMU_NAME);
		return -EINVAL;
	}

	/* we are in snapshot mode */
	if (opts->auxtrace_snapshot_mode) {
		/*
		 * No size were given to '-S' or '-m,', so go with
		 * the default
		 */
		if (!opts->auxtrace_snapshot_size &&
		    !opts->auxtrace_mmap_pages) {
			if (privileged) {
				opts->auxtrace_mmap_pages = MiB(4) / page_size;
			} else {
				opts->auxtrace_mmap_pages =
							KiB(128) / page_size;
				if (opts->mmap_pages == UINT_MAX)
					opts->mmap_pages = KiB(256) / page_size;
			}
		} else if (!opts->auxtrace_mmap_pages && !privileged &&
						opts->mmap_pages == UINT_MAX) {
			opts->mmap_pages = KiB(256) / page_size;
		}

		/*
		 * '-m,xyz' was specified but no snapshot size, so make the
		 * snapshot size as big as the auxtrace mmap area.
		 */
		if (!opts->auxtrace_snapshot_size) {
			opts->auxtrace_snapshot_size =
				opts->auxtrace_mmap_pages * (size_t)page_size;
		}

		/*
		 * -Sxyz was specified but no auxtrace mmap area, so make the
		 * auxtrace mmap area big enough to fit the requested snapshot
		 * size.
		 */
		if (!opts->auxtrace_mmap_pages) {
			size_t sz = opts->auxtrace_snapshot_size;

			sz = round_up(sz, page_size) / page_size;
			opts->auxtrace_mmap_pages = roundup_pow_of_two(sz);
		}

		/* Snapshost size can't be bigger than the auxtrace area */
		if (opts->auxtrace_snapshot_size >
				opts->auxtrace_mmap_pages * (size_t)page_size) {
			pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n",
			       opts->auxtrace_snapshot_size,
			       opts->auxtrace_mmap_pages * (size_t)page_size);
			return -EINVAL;
		}

		/* Something went wrong somewhere - this shouldn't happen */
		if (!opts->auxtrace_snapshot_size ||
		    !opts->auxtrace_mmap_pages) {
			pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n");
			return -EINVAL;
		}
	}

	/* We are in full trace mode but '-m,xyz' wasn't specified */
	if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
		if (privileged) {
			opts->auxtrace_mmap_pages = MiB(4) / page_size;
		} else {
			opts->auxtrace_mmap_pages = KiB(128) / page_size;
			if (opts->mmap_pages == UINT_MAX)
				opts->mmap_pages = KiB(256) / page_size;
		}

	}

	/* Validate auxtrace_mmap_pages provided by user */
	if (opts->auxtrace_mmap_pages) {
		unsigned int max_page = (KiB(128) / page_size);
		size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;

		if (!privileged &&
		    opts->auxtrace_mmap_pages > max_page) {
			opts->auxtrace_mmap_pages = max_page;
			pr_err("auxtrace too big, truncating to %d\n",
			       max_page);
		}

		if (!is_power_of_2(sz)) {
			pr_err("Invalid mmap size for %s: must be a power of 2\n",
			       CORESIGHT_ETM_PMU_NAME);
			return -EINVAL;
		}
	}

	if (opts->auxtrace_snapshot_mode)
		pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME,
			  opts->auxtrace_snapshot_size);

	/*
	 * To obtain the auxtrace buffer file descriptor, the auxtrace
	 * event must come first.
	 */
	perf_evlist__to_front(evlist, cs_etm_evsel);

	/*
	 * In the case of per-cpu mmaps, we need the CPU on the
	 * AUX event.
	 */
	if (!cpu_map__empty(cpus))
		perf_evsel__set_sample_bit(cs_etm_evsel, CPU);

	/* Add dummy event to keep tracking */
	if (opts->full_auxtrace) {
		struct perf_evsel *tracking_evsel;
		int err;

		err = parse_events(evlist, "dummy:u", NULL);
		if (err)
			return err;

		tracking_evsel = perf_evlist__last(evlist);
		perf_evlist__set_tracking_event(evlist, tracking_evsel);

		tracking_evsel->attr.freq = 0;
		tracking_evsel->attr.sample_period = 1;

		/* In per-cpu case, always need the time of mmap events etc */
		if (!cpu_map__empty(cpus))
			perf_evsel__set_sample_bit(tracking_evsel, TIME);
	}

	return 0;
}

static u64 cs_etm_get_config(struct auxtrace_record *itr)
{
	u64 config = 0;
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
	struct perf_evlist *evlist = ptr->evlist;
	struct perf_evsel *evsel;

	evlist__for_each_entry(evlist, evsel) {
		if (evsel->attr.type == cs_etm_pmu->type) {
			/*
			 * Variable perf_event_attr::config is assigned to
			 * ETMv3/PTM.  The bit fields have been made to match
			 * the ETMv3.5 ETRMCR register specification.  See the
			 * PMU_FORMAT_ATTR() declarations in
			 * drivers/hwtracing/coresight/coresight-perf.c for
			 * details.
			 */
			config = evsel->attr.config;
			break;
		}
	}

	return config;
}

static size_t
cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused,
		      struct perf_evlist *evlist __maybe_unused)
{
	int i;
	int etmv3 = 0, etmv4 = 0;
	const struct cpu_map *cpus = evlist->cpus;

	/* cpu map is not empty, we have specific CPUs to work with */
	if (!cpu_map__empty(cpus)) {
		for (i = 0; i < cpu_map__nr(cpus); i++) {
			if (cs_etm_is_etmv4(itr, cpus->map[i]))
				etmv4++;
			else
				etmv3++;
		}
	} else {
		/* get configuration for all CPUs in the system */
		for (i = 0; i < cpu__max_cpu(); i++) {
			if (cs_etm_is_etmv4(itr, i))
				etmv4++;
			else
				etmv3++;
		}
	}

	return (CS_ETM_HEADER_SIZE +
	       (etmv4 * CS_ETMV4_PRIV_SIZE) +
	       (etmv3 * CS_ETMV3_PRIV_SIZE));
}

static const char *metadata_etmv3_ro[CS_ETM_PRIV_MAX] = {
	[CS_ETM_ETMCCER]	= "mgmt/etmccer",
	[CS_ETM_ETMIDR]		= "mgmt/etmidr",
};

static const char *metadata_etmv4_ro[CS_ETMV4_PRIV_MAX] = {
	[CS_ETMV4_TRCIDR0]		= "trcidr/trcidr0",
	[CS_ETMV4_TRCIDR1]		= "trcidr/trcidr1",
	[CS_ETMV4_TRCIDR2]		= "trcidr/trcidr2",
	[CS_ETMV4_TRCIDR8]		= "trcidr/trcidr8",
	[CS_ETMV4_TRCAUTHSTATUS]	= "mgmt/trcauthstatus",
};

static bool cs_etm_is_etmv4(struct auxtrace_record *itr, int cpu)
{
	bool ret = false;
	char path[PATH_MAX];
	int scan;
	unsigned int val;
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;

	/* Take any of the RO files for ETMv4 and see if it present */
	snprintf(path, PATH_MAX, "cpu%d/%s",
		 cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
	scan = perf_pmu__scan_file(cs_etm_pmu, path, "%x", &val);

	/* The file was read successfully, we have a winner */
	if (scan == 1)
		ret = true;

	return ret;
}

static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path)
{
	char pmu_path[PATH_MAX];
	int scan;
	unsigned int val = 0;

	/* Get RO metadata from sysfs */
	snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu, path);

	scan = perf_pmu__scan_file(pmu, pmu_path, "%x", &val);
	if (scan != 1)
		pr_err("%s: error reading: %s\n", __func__, pmu_path);

	return val;
}

static void cs_etm_get_metadata(int cpu, u32 *offset,
				struct auxtrace_record *itr,
				struct auxtrace_info_event *info)
{
	u32 increment;
	u64 magic;
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;

	/* first see what kind of tracer this cpu is affined to */
	if (cs_etm_is_etmv4(itr, cpu)) {
		magic = __perf_cs_etmv4_magic;
		/* Get trace configuration register */
		info->priv[*offset + CS_ETMV4_TRCCONFIGR] =
						cs_etm_get_config(itr);
		/* Get traceID from the framework */
		info->priv[*offset + CS_ETMV4_TRCTRACEIDR] =
						coresight_get_trace_id(cpu);
		/* Get read-only information from sysFS */
		info->priv[*offset + CS_ETMV4_TRCIDR0] =
			cs_etm_get_ro(cs_etm_pmu, cpu,
				      metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
		info->priv[*offset + CS_ETMV4_TRCIDR1] =
			cs_etm_get_ro(cs_etm_pmu, cpu,
				      metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
		info->priv[*offset + CS_ETMV4_TRCIDR2] =
			cs_etm_get_ro(cs_etm_pmu, cpu,
				      metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
		info->priv[*offset + CS_ETMV4_TRCIDR8] =
			cs_etm_get_ro(cs_etm_pmu, cpu,
				      metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
		info->priv[*offset + CS_ETMV4_TRCAUTHSTATUS] =
			cs_etm_get_ro(cs_etm_pmu, cpu,
				      metadata_etmv4_ro
				      [CS_ETMV4_TRCAUTHSTATUS]);

		/* How much space was used */
		increment = CS_ETMV4_PRIV_MAX;
	} else {
		magic = __perf_cs_etmv3_magic;
		/* Get configuration register */
		info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr);
		/* Get traceID from the framework */
		info->priv[*offset + CS_ETM_ETMTRACEIDR] =
						coresight_get_trace_id(cpu);
		/* Get read-only information from sysFS */
		info->priv[*offset + CS_ETM_ETMCCER] =
			cs_etm_get_ro(cs_etm_pmu, cpu,
				      metadata_etmv3_ro[CS_ETM_ETMCCER]);
		info->priv[*offset + CS_ETM_ETMIDR] =
			cs_etm_get_ro(cs_etm_pmu, cpu,
				      metadata_etmv3_ro[CS_ETM_ETMIDR]);

		/* How much space was used */
		increment = CS_ETM_PRIV_MAX;
	}

	/* Build generic header portion */
	info->priv[*offset + CS_ETM_MAGIC] = magic;
	info->priv[*offset + CS_ETM_CPU] = cpu;
	/* Where the next CPU entry should start from */
	*offset += increment;
}

static int cs_etm_info_fill(struct auxtrace_record *itr,
			    struct perf_session *session,
			    struct auxtrace_info_event *info,
			    size_t priv_size)
{
	int i;
	u32 offset;
	u64 nr_cpu, type;
	const struct cpu_map *cpus = session->evlist->cpus;
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;

	if (priv_size != cs_etm_info_priv_size(itr, session->evlist))
		return -EINVAL;

	if (!session->evlist->nr_mmaps)
		return -EINVAL;

	/* If the cpu_map is empty all CPUs are involved */
	nr_cpu = cpu_map__empty(cpus) ? cpu__max_cpu() : cpu_map__nr(cpus);
	/* Get PMU type as dynamically assigned by the core */
	type = cs_etm_pmu->type;

	/* First fill out the session header */
	info->type = PERF_AUXTRACE_CS_ETM;
	info->priv[CS_HEADER_VERSION_0] = 0;
	info->priv[CS_PMU_TYPE_CPUS] = type << 32;
	info->priv[CS_PMU_TYPE_CPUS] |= nr_cpu;
	info->priv[CS_ETM_SNAPSHOT] = ptr->snapshot_mode;

	offset = CS_ETM_SNAPSHOT + 1;

	/* cpu map is not empty, we have specific CPUs to work with */
	if (!cpu_map__empty(cpus)) {
		for (i = 0; i < cpu_map__nr(cpus) && offset < priv_size; i++)
			cs_etm_get_metadata(cpus->map[i], &offset, itr, info);
	} else {
		/* get configuration for all CPUs in the system */
		for (i = 0; i < cpu__max_cpu(); i++)
			cs_etm_get_metadata(i, &offset, itr, info);
	}

	return 0;
}

static int 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)
{
	pr_debug3("%s: mmap index %d old head %zu new head %zu size %zu\n",
		  __func__, idx, (size_t)*old, (size_t)*head, mm->len);

	*old = *head;
	*head += mm->len;

	return 0;
}

static int cs_etm_snapshot_start(struct auxtrace_record *itr)
{
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	struct perf_evsel *evsel;

	evlist__for_each_entry(ptr->evlist, evsel) {
		if (evsel->attr.type == ptr->cs_etm_pmu->type)
			return perf_evsel__disable(evsel);
	}
	return -EINVAL;
}

static int cs_etm_snapshot_finish(struct auxtrace_record *itr)
{
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	struct perf_evsel *evsel;

	evlist__for_each_entry(ptr->evlist, evsel) {
		if (evsel->attr.type == ptr->cs_etm_pmu->type)
			return perf_evsel__enable(evsel);
	}
	return -EINVAL;
}

static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused)
{
	return (((u64) rand() <<  0) & 0x00000000FFFFFFFFull) |
		(((u64) rand() << 32) & 0xFFFFFFFF00000000ull);
}

static void cs_etm_recording_free(struct auxtrace_record *itr)
{
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	free(ptr);
}

static int cs_etm_read_finish(struct auxtrace_record *itr, int idx)
{
	struct cs_etm_recording *ptr =
			container_of(itr, struct cs_etm_recording, itr);
	struct perf_evsel *evsel;

	evlist__for_each_entry(ptr->evlist, evsel) {
		if (evsel->attr.type == ptr->cs_etm_pmu->type)
			return perf_evlist__enable_event_idx(ptr->evlist,
							     evsel, idx);
	}

	return -EINVAL;
}

struct auxtrace_record *cs_etm_record_init(int *err)
{
	struct perf_pmu *cs_etm_pmu;
	struct cs_etm_recording *ptr;

	cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);

	if (!cs_etm_pmu) {
		*err = -EINVAL;
		goto out;
	}

	ptr = zalloc(sizeof(struct cs_etm_recording));
	if (!ptr) {
		*err = -ENOMEM;
		goto out;
	}

	ptr->cs_etm_pmu			= cs_etm_pmu;
	ptr->itr.parse_snapshot_options	= cs_etm_parse_snapshot_options;
	ptr->itr.recording_options	= cs_etm_recording_options;
	ptr->itr.info_priv_size		= cs_etm_info_priv_size;
	ptr->itr.info_fill		= cs_etm_info_fill;
	ptr->itr.find_snapshot		= cs_etm_find_snapshot;
	ptr->itr.snapshot_start		= cs_etm_snapshot_start;
	ptr->itr.snapshot_finish	= cs_etm_snapshot_finish;
	ptr->itr.reference		= cs_etm_reference;
	ptr->itr.free			= cs_etm_recording_free;
	ptr->itr.read_finish		= cs_etm_read_finish;

	*err = 0;
	return &ptr->itr;
out:
	return NULL;
}

static FILE *cs_device__open_file(const char *name)
{
	struct stat st;
	char path[PATH_MAX];
	const char *sysfs;

	sysfs = sysfs__mountpoint();
	if (!sysfs)
		return NULL;

	snprintf(path, PATH_MAX,
		 "%s" CS_BUS_DEVICE_PATH "%s", sysfs, name);

	if (stat(path, &st) < 0)
		return NULL;

	return fopen(path, "w");

}

static int __printf(2, 3) cs_device__print_file(const char *name, const char *fmt, ...)
{
	va_list args;
	FILE *file;
	int ret = -EINVAL;

	va_start(args, fmt);
	file = cs_device__open_file(name);
	if (file) {
		ret = vfprintf(file, fmt, args);
		fclose(file);
	}
	va_end(args);
	return ret;
}

int cs_etm_set_drv_config(struct perf_evsel_config_term *term)
{
	int ret;
	char enable_sink[ENABLE_SINK_MAX];

	snprintf(enable_sink, ENABLE_SINK_MAX, "%s/%s",
		 term->val.drv_cfg, "enable_sink");

	ret = cs_device__print_file(enable_sink, "%d", 1);
	if (ret < 0)
		return ret;

	return 0;
}