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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/compat.h>
8#include <linux/mm.h>
9#include <linux/module.h>
10#include <linux/file.h>
11#include <linux/slab.h>
12#include <linux/sched/signal.h>
13#include <linux/time.h>
14#include <linux/pm_qos.h>
15#include <linux/io.h>
16#include <linux/dma-mapping.h>
17#include <linux/vmalloc.h>
18#include <sound/core.h>
19#include <sound/control.h>
20#include <sound/info.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/timer.h>
24#include <sound/minors.h>
25#include <linux/uio.h>
26#include <linux/delay.h>
27
28#include "pcm_local.h"
29
30#ifdef CONFIG_SND_DEBUG
31#define CREATE_TRACE_POINTS
32#include "pcm_param_trace.h"
33#else
34#define trace_hw_mask_param_enabled() 0
35#define trace_hw_interval_param_enabled() 0
36#define trace_hw_mask_param(substream, type, index, prev, curr)
37#define trace_hw_interval_param(substream, type, index, prev, curr)
38#endif
39
40/*
41 * Compatibility
42 */
43
44struct snd_pcm_hw_params_old {
45 unsigned int flags;
46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
47 SNDRV_PCM_HW_PARAM_ACCESS + 1];
48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
50 unsigned int rmask;
51 unsigned int cmask;
52 unsigned int info;
53 unsigned int msbits;
54 unsigned int rate_num;
55 unsigned int rate_den;
56 snd_pcm_uframes_t fifo_size;
57 unsigned char reserved[64];
58};
59
60#ifdef CONFIG_SND_SUPPORT_OLD_API
61#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
62#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
63
64static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68#endif
69static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
70
71/*
72 *
73 */
74
75static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77void snd_pcm_group_init(struct snd_pcm_group *group)
78{
79 spin_lock_init(&group->lock);
80 mutex_init(&group->mutex);
81 INIT_LIST_HEAD(&group->substreams);
82 refcount_set(&group->refs, 1);
83}
84
85/* define group lock helpers */
86#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
87static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
88{ \
89 if (nonatomic) \
90 mutex_ ## mutex_action(&group->mutex); \
91 else \
92 spin_ ## action(&group->lock); \
93}
94
95DEFINE_PCM_GROUP_LOCK(lock, lock);
96DEFINE_PCM_GROUP_LOCK(unlock, unlock);
97DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
98DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
99
100/**
101 * snd_pcm_stream_lock - Lock the PCM stream
102 * @substream: PCM substream
103 *
104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
105 * flag of the given substream. This also takes the global link rw lock
106 * (or rw sem), too, for avoiding the race with linked streams.
107 */
108void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
109{
110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
111}
112EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
113
114/**
115 * snd_pcm_stream_lock - Unlock the PCM stream
116 * @substream: PCM substream
117 *
118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
119 */
120void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
121{
122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
123}
124EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
125
126/**
127 * snd_pcm_stream_lock_irq - Lock the PCM stream
128 * @substream: PCM substream
129 *
130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
132 * as snd_pcm_stream_lock().
133 */
134void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
135{
136 snd_pcm_group_lock_irq(&substream->self_group,
137 substream->pcm->nonatomic);
138}
139EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
140
141static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
142{
143 struct snd_pcm_group *group = &substream->self_group;
144
145 if (substream->pcm->nonatomic)
146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
147 else
148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
149}
150
151/**
152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
153 * @substream: PCM substream
154 *
155 * This is a counter-part of snd_pcm_stream_lock_irq().
156 */
157void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
158{
159 snd_pcm_group_unlock_irq(&substream->self_group,
160 substream->pcm->nonatomic);
161}
162EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
163
164unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
165{
166 unsigned long flags = 0;
167 if (substream->pcm->nonatomic)
168 mutex_lock(&substream->self_group.mutex);
169 else
170 spin_lock_irqsave(&substream->self_group.lock, flags);
171 return flags;
172}
173EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
174
175/**
176 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
177 * @substream: PCM substream
178 * @flags: irq flags
179 *
180 * This is a counter-part of snd_pcm_stream_lock_irqsave().
181 */
182void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
183 unsigned long flags)
184{
185 if (substream->pcm->nonatomic)
186 mutex_unlock(&substream->self_group.mutex);
187 else
188 spin_unlock_irqrestore(&substream->self_group.lock, flags);
189}
190EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
191
192/* Run PCM ioctl ops */
193static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
194 unsigned cmd, void *arg)
195{
196 if (substream->ops->ioctl)
197 return substream->ops->ioctl(substream, cmd, arg);
198 else
199 return snd_pcm_lib_ioctl(substream, cmd, arg);
200}
201
202int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
203{
204 struct snd_pcm *pcm = substream->pcm;
205 struct snd_pcm_str *pstr = substream->pstr;
206
207 memset(info, 0, sizeof(*info));
208 info->card = pcm->card->number;
209 info->device = pcm->device;
210 info->stream = substream->stream;
211 info->subdevice = substream->number;
212 strlcpy(info->id, pcm->id, sizeof(info->id));
213 strlcpy(info->name, pcm->name, sizeof(info->name));
214 info->dev_class = pcm->dev_class;
215 info->dev_subclass = pcm->dev_subclass;
216 info->subdevices_count = pstr->substream_count;
217 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
218 strlcpy(info->subname, substream->name, sizeof(info->subname));
219
220 return 0;
221}
222
223int snd_pcm_info_user(struct snd_pcm_substream *substream,
224 struct snd_pcm_info __user * _info)
225{
226 struct snd_pcm_info *info;
227 int err;
228
229 info = kmalloc(sizeof(*info), GFP_KERNEL);
230 if (! info)
231 return -ENOMEM;
232 err = snd_pcm_info(substream, info);
233 if (err >= 0) {
234 if (copy_to_user(_info, info, sizeof(*info)))
235 err = -EFAULT;
236 }
237 kfree(info);
238 return err;
239}
240
241/* macro for simplified cast */
242#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
243
244static bool hw_support_mmap(struct snd_pcm_substream *substream)
245{
246 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
247 return false;
248
249 if (substream->ops->mmap ||
250 (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV &&
251 substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC))
252 return true;
253
254 return dma_can_mmap(substream->dma_buffer.dev.dev);
255}
256
257static int constrain_mask_params(struct snd_pcm_substream *substream,
258 struct snd_pcm_hw_params *params)
259{
260 struct snd_pcm_hw_constraints *constrs =
261 &substream->runtime->hw_constraints;
262 struct snd_mask *m;
263 unsigned int k;
264 struct snd_mask old_mask;
265 int changed;
266
267 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
268 m = hw_param_mask(params, k);
269 if (snd_mask_empty(m))
270 return -EINVAL;
271
272 /* This parameter is not requested to change by a caller. */
273 if (!(params->rmask & PARAM_MASK_BIT(k)))
274 continue;
275
276 if (trace_hw_mask_param_enabled())
277 old_mask = *m;
278
279 changed = snd_mask_refine(m, constrs_mask(constrs, k));
280 if (changed < 0)
281 return changed;
282 if (changed == 0)
283 continue;
284
285 /* Set corresponding flag so that the caller gets it. */
286 trace_hw_mask_param(substream, k, 0, &old_mask, m);
287 params->cmask |= PARAM_MASK_BIT(k);
288 }
289
290 return 0;
291}
292
293static int constrain_interval_params(struct snd_pcm_substream *substream,
294 struct snd_pcm_hw_params *params)
295{
296 struct snd_pcm_hw_constraints *constrs =
297 &substream->runtime->hw_constraints;
298 struct snd_interval *i;
299 unsigned int k;
300 struct snd_interval old_interval;
301 int changed;
302
303 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
304 i = hw_param_interval(params, k);
305 if (snd_interval_empty(i))
306 return -EINVAL;
307
308 /* This parameter is not requested to change by a caller. */
309 if (!(params->rmask & PARAM_MASK_BIT(k)))
310 continue;
311
312 if (trace_hw_interval_param_enabled())
313 old_interval = *i;
314
315 changed = snd_interval_refine(i, constrs_interval(constrs, k));
316 if (changed < 0)
317 return changed;
318 if (changed == 0)
319 continue;
320
321 /* Set corresponding flag so that the caller gets it. */
322 trace_hw_interval_param(substream, k, 0, &old_interval, i);
323 params->cmask |= PARAM_MASK_BIT(k);
324 }
325
326 return 0;
327}
328
329static int constrain_params_by_rules(struct snd_pcm_substream *substream,
330 struct snd_pcm_hw_params *params)
331{
332 struct snd_pcm_hw_constraints *constrs =
333 &substream->runtime->hw_constraints;
334 unsigned int k;
335 unsigned int *rstamps;
336 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
337 unsigned int stamp;
338 struct snd_pcm_hw_rule *r;
339 unsigned int d;
340 struct snd_mask old_mask;
341 struct snd_interval old_interval;
342 bool again;
343 int changed, err = 0;
344
345 /*
346 * Each application of rule has own sequence number.
347 *
348 * Each member of 'rstamps' array represents the sequence number of
349 * recent application of corresponding rule.
350 */
351 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
352 if (!rstamps)
353 return -ENOMEM;
354
355 /*
356 * Each member of 'vstamps' array represents the sequence number of
357 * recent application of rule in which corresponding parameters were
358 * changed.
359 *
360 * In initial state, elements corresponding to parameters requested by
361 * a caller is 1. For unrequested parameters, corresponding members
362 * have 0 so that the parameters are never changed anymore.
363 */
364 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
365 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
366
367 /* Due to the above design, actual sequence number starts at 2. */
368 stamp = 2;
369retry:
370 /* Apply all rules in order. */
371 again = false;
372 for (k = 0; k < constrs->rules_num; k++) {
373 r = &constrs->rules[k];
374
375 /*
376 * Check condition bits of this rule. When the rule has
377 * some condition bits, parameter without the bits is
378 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
379 * is an example of the condition bits.
380 */
381 if (r->cond && !(r->cond & params->flags))
382 continue;
383
384 /*
385 * The 'deps' array includes maximum three dependencies
386 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth
387 * member of this array is a sentinel and should be
388 * negative value.
389 *
390 * This rule should be processed in this time when dependent
391 * parameters were changed at former applications of the other
392 * rules.
393 */
394 for (d = 0; r->deps[d] >= 0; d++) {
395 if (vstamps[r->deps[d]] > rstamps[k])
396 break;
397 }
398 if (r->deps[d] < 0)
399 continue;
400
401 if (trace_hw_mask_param_enabled()) {
402 if (hw_is_mask(r->var))
403 old_mask = *hw_param_mask(params, r->var);
404 }
405 if (trace_hw_interval_param_enabled()) {
406 if (hw_is_interval(r->var))
407 old_interval = *hw_param_interval(params, r->var);
408 }
409
410 changed = r->func(params, r);
411 if (changed < 0) {
412 err = changed;
413 goto out;
414 }
415
416 /*
417 * When the parameter is changed, notify it to the caller
418 * by corresponding returned bit, then preparing for next
419 * iteration.
420 */
421 if (changed && r->var >= 0) {
422 if (hw_is_mask(r->var)) {
423 trace_hw_mask_param(substream, r->var,
424 k + 1, &old_mask,
425 hw_param_mask(params, r->var));
426 }
427 if (hw_is_interval(r->var)) {
428 trace_hw_interval_param(substream, r->var,
429 k + 1, &old_interval,
430 hw_param_interval(params, r->var));
431 }
432
433 params->cmask |= PARAM_MASK_BIT(r->var);
434 vstamps[r->var] = stamp;
435 again = true;
436 }
437
438 rstamps[k] = stamp++;
439 }
440
441 /* Iterate to evaluate all rules till no parameters are changed. */
442 if (again)
443 goto retry;
444
445 out:
446 kfree(rstamps);
447 return err;
448}
449
450static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
451 struct snd_pcm_hw_params *params)
452{
453 const struct snd_interval *i;
454 const struct snd_mask *m;
455 int err;
456
457 if (!params->msbits) {
458 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
459 if (snd_interval_single(i))
460 params->msbits = snd_interval_value(i);
461 }
462
463 if (!params->rate_den) {
464 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
465 if (snd_interval_single(i)) {
466 params->rate_num = snd_interval_value(i);
467 params->rate_den = 1;
468 }
469 }
470
471 if (!params->fifo_size) {
472 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
473 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
474 if (snd_mask_single(m) && snd_interval_single(i)) {
475 err = snd_pcm_ops_ioctl(substream,
476 SNDRV_PCM_IOCTL1_FIFO_SIZE,
477 params);
478 if (err < 0)
479 return err;
480 }
481 }
482
483 if (!params->info) {
484 params->info = substream->runtime->hw.info;
485 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
486 SNDRV_PCM_INFO_DRAIN_TRIGGER);
487 if (!hw_support_mmap(substream))
488 params->info &= ~(SNDRV_PCM_INFO_MMAP |
489 SNDRV_PCM_INFO_MMAP_VALID);
490 }
491
492 return 0;
493}
494
495int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
496 struct snd_pcm_hw_params *params)
497{
498 int err;
499
500 params->info = 0;
501 params->fifo_size = 0;
502 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
503 params->msbits = 0;
504 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
505 params->rate_num = 0;
506 params->rate_den = 0;
507 }
508
509 err = constrain_mask_params(substream, params);
510 if (err < 0)
511 return err;
512
513 err = constrain_interval_params(substream, params);
514 if (err < 0)
515 return err;
516
517 err = constrain_params_by_rules(substream, params);
518 if (err < 0)
519 return err;
520
521 params->rmask = 0;
522
523 return 0;
524}
525EXPORT_SYMBOL(snd_pcm_hw_refine);
526
527static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
528 struct snd_pcm_hw_params __user * _params)
529{
530 struct snd_pcm_hw_params *params;
531 int err;
532
533 params = memdup_user(_params, sizeof(*params));
534 if (IS_ERR(params))
535 return PTR_ERR(params);
536
537 err = snd_pcm_hw_refine(substream, params);
538 if (err < 0)
539 goto end;
540
541 err = fixup_unreferenced_params(substream, params);
542 if (err < 0)
543 goto end;
544
545 if (copy_to_user(_params, params, sizeof(*params)))
546 err = -EFAULT;
547end:
548 kfree(params);
549 return err;
550}
551
552static int period_to_usecs(struct snd_pcm_runtime *runtime)
553{
554 int usecs;
555
556 if (! runtime->rate)
557 return -1; /* invalid */
558
559 /* take 75% of period time as the deadline */
560 usecs = (750000 / runtime->rate) * runtime->period_size;
561 usecs += ((750000 % runtime->rate) * runtime->period_size) /
562 runtime->rate;
563
564 return usecs;
565}
566
567static void snd_pcm_set_state(struct snd_pcm_substream *substream,
568 snd_pcm_state_t state)
569{
570 snd_pcm_stream_lock_irq(substream);
571 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
572 substream->runtime->status->state = state;
573 snd_pcm_stream_unlock_irq(substream);
574}
575
576static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
577 int event)
578{
579#ifdef CONFIG_SND_PCM_TIMER
580 if (substream->timer)
581 snd_timer_notify(substream->timer, event,
582 &substream->runtime->trigger_tstamp);
583#endif
584}
585
586static void snd_pcm_sync_stop(struct snd_pcm_substream *substream)
587{
588 if (substream->runtime->stop_operating) {
589 substream->runtime->stop_operating = false;
590 if (substream->ops->sync_stop)
591 substream->ops->sync_stop(substream);
592 else if (substream->pcm->card->sync_irq > 0)
593 synchronize_irq(substream->pcm->card->sync_irq);
594 }
595}
596
597/**
598 * snd_pcm_hw_param_choose - choose a configuration defined by @params
599 * @pcm: PCM instance
600 * @params: the hw_params instance
601 *
602 * Choose one configuration from configuration space defined by @params.
603 * The configuration chosen is that obtained fixing in this order:
604 * first access, first format, first subformat, min channels,
605 * min rate, min period time, max buffer size, min tick time
606 *
607 * Return: Zero if successful, or a negative error code on failure.
608 */
609static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
610 struct snd_pcm_hw_params *params)
611{
612 static const int vars[] = {
613 SNDRV_PCM_HW_PARAM_ACCESS,
614 SNDRV_PCM_HW_PARAM_FORMAT,
615 SNDRV_PCM_HW_PARAM_SUBFORMAT,
616 SNDRV_PCM_HW_PARAM_CHANNELS,
617 SNDRV_PCM_HW_PARAM_RATE,
618 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
619 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
620 SNDRV_PCM_HW_PARAM_TICK_TIME,
621 -1
622 };
623 const int *v;
624 struct snd_mask old_mask;
625 struct snd_interval old_interval;
626 int changed;
627
628 for (v = vars; *v != -1; v++) {
629 /* Keep old parameter to trace. */
630 if (trace_hw_mask_param_enabled()) {
631 if (hw_is_mask(*v))
632 old_mask = *hw_param_mask(params, *v);
633 }
634 if (trace_hw_interval_param_enabled()) {
635 if (hw_is_interval(*v))
636 old_interval = *hw_param_interval(params, *v);
637 }
638 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
639 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
640 else
641 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
642 if (changed < 0)
643 return changed;
644 if (changed == 0)
645 continue;
646
647 /* Trace the changed parameter. */
648 if (hw_is_mask(*v)) {
649 trace_hw_mask_param(pcm, *v, 0, &old_mask,
650 hw_param_mask(params, *v));
651 }
652 if (hw_is_interval(*v)) {
653 trace_hw_interval_param(pcm, *v, 0, &old_interval,
654 hw_param_interval(params, *v));
655 }
656 }
657
658 return 0;
659}
660
661static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
662 struct snd_pcm_hw_params *params)
663{
664 struct snd_pcm_runtime *runtime;
665 int err, usecs;
666 unsigned int bits;
667 snd_pcm_uframes_t frames;
668
669 if (PCM_RUNTIME_CHECK(substream))
670 return -ENXIO;
671 runtime = substream->runtime;
672 snd_pcm_stream_lock_irq(substream);
673 switch (runtime->status->state) {
674 case SNDRV_PCM_STATE_OPEN:
675 case SNDRV_PCM_STATE_SETUP:
676 case SNDRV_PCM_STATE_PREPARED:
677 break;
678 default:
679 snd_pcm_stream_unlock_irq(substream);
680 return -EBADFD;
681 }
682 snd_pcm_stream_unlock_irq(substream);
683#if IS_ENABLED(CONFIG_SND_PCM_OSS)
684 if (!substream->oss.oss)
685#endif
686 if (atomic_read(&substream->mmap_count))
687 return -EBADFD;
688
689 snd_pcm_sync_stop(substream);
690
691 params->rmask = ~0U;
692 err = snd_pcm_hw_refine(substream, params);
693 if (err < 0)
694 goto _error;
695
696 err = snd_pcm_hw_params_choose(substream, params);
697 if (err < 0)
698 goto _error;
699
700 err = fixup_unreferenced_params(substream, params);
701 if (err < 0)
702 goto _error;
703
704 if (substream->managed_buffer_alloc) {
705 err = snd_pcm_lib_malloc_pages(substream,
706 params_buffer_bytes(params));
707 if (err < 0)
708 goto _error;
709 runtime->buffer_changed = err > 0;
710 }
711
712 if (substream->ops->hw_params != NULL) {
713 err = substream->ops->hw_params(substream, params);
714 if (err < 0)
715 goto _error;
716 }
717
718 runtime->access = params_access(params);
719 runtime->format = params_format(params);
720 runtime->subformat = params_subformat(params);
721 runtime->channels = params_channels(params);
722 runtime->rate = params_rate(params);
723 runtime->period_size = params_period_size(params);
724 runtime->periods = params_periods(params);
725 runtime->buffer_size = params_buffer_size(params);
726 runtime->info = params->info;
727 runtime->rate_num = params->rate_num;
728 runtime->rate_den = params->rate_den;
729 runtime->no_period_wakeup =
730 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
731 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
732
733 bits = snd_pcm_format_physical_width(runtime->format);
734 runtime->sample_bits = bits;
735 bits *= runtime->channels;
736 runtime->frame_bits = bits;
737 frames = 1;
738 while (bits % 8 != 0) {
739 bits *= 2;
740 frames *= 2;
741 }
742 runtime->byte_align = bits / 8;
743 runtime->min_align = frames;
744
745 /* Default sw params */
746 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
747 runtime->period_step = 1;
748 runtime->control->avail_min = runtime->period_size;
749 runtime->start_threshold = 1;
750 runtime->stop_threshold = runtime->buffer_size;
751 runtime->silence_threshold = 0;
752 runtime->silence_size = 0;
753 runtime->boundary = runtime->buffer_size;
754 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
755 runtime->boundary *= 2;
756
757 /* clear the buffer for avoiding possible kernel info leaks */
758 if (runtime->dma_area && !substream->ops->copy_user)
759 memset(runtime->dma_area, 0, runtime->dma_bytes);
760
761 snd_pcm_timer_resolution_change(substream);
762 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
763
764 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
765 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
766 if ((usecs = period_to_usecs(runtime)) >= 0)
767 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
768 usecs);
769 return 0;
770 _error:
771 /* hardware might be unusable from this time,
772 so we force application to retry to set
773 the correct hardware parameter settings */
774 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
775 if (substream->ops->hw_free != NULL)
776 substream->ops->hw_free(substream);
777 if (substream->managed_buffer_alloc)
778 snd_pcm_lib_free_pages(substream);
779 return err;
780}
781
782static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
783 struct snd_pcm_hw_params __user * _params)
784{
785 struct snd_pcm_hw_params *params;
786 int err;
787
788 params = memdup_user(_params, sizeof(*params));
789 if (IS_ERR(params))
790 return PTR_ERR(params);
791
792 err = snd_pcm_hw_params(substream, params);
793 if (err < 0)
794 goto end;
795
796 if (copy_to_user(_params, params, sizeof(*params)))
797 err = -EFAULT;
798end:
799 kfree(params);
800 return err;
801}
802
803static int do_hw_free(struct snd_pcm_substream *substream)
804{
805 int result = 0;
806
807 snd_pcm_sync_stop(substream);
808 if (substream->ops->hw_free)
809 result = substream->ops->hw_free(substream);
810 if (substream->managed_buffer_alloc)
811 snd_pcm_lib_free_pages(substream);
812 return result;
813}
814
815static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
816{
817 struct snd_pcm_runtime *runtime;
818 int result;
819
820 if (PCM_RUNTIME_CHECK(substream))
821 return -ENXIO;
822 runtime = substream->runtime;
823 snd_pcm_stream_lock_irq(substream);
824 switch (runtime->status->state) {
825 case SNDRV_PCM_STATE_SETUP:
826 case SNDRV_PCM_STATE_PREPARED:
827 break;
828 default:
829 snd_pcm_stream_unlock_irq(substream);
830 return -EBADFD;
831 }
832 snd_pcm_stream_unlock_irq(substream);
833 if (atomic_read(&substream->mmap_count))
834 return -EBADFD;
835 result = do_hw_free(substream);
836 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
837 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
838 return result;
839}
840
841static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
842 struct snd_pcm_sw_params *params)
843{
844 struct snd_pcm_runtime *runtime;
845 int err;
846
847 if (PCM_RUNTIME_CHECK(substream))
848 return -ENXIO;
849 runtime = substream->runtime;
850 snd_pcm_stream_lock_irq(substream);
851 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
852 snd_pcm_stream_unlock_irq(substream);
853 return -EBADFD;
854 }
855 snd_pcm_stream_unlock_irq(substream);
856
857 if (params->tstamp_mode < 0 ||
858 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
859 return -EINVAL;
860 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
861 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
862 return -EINVAL;
863 if (params->avail_min == 0)
864 return -EINVAL;
865 if (params->silence_size >= runtime->boundary) {
866 if (params->silence_threshold != 0)
867 return -EINVAL;
868 } else {
869 if (params->silence_size > params->silence_threshold)
870 return -EINVAL;
871 if (params->silence_threshold > runtime->buffer_size)
872 return -EINVAL;
873 }
874 err = 0;
875 snd_pcm_stream_lock_irq(substream);
876 runtime->tstamp_mode = params->tstamp_mode;
877 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
878 runtime->tstamp_type = params->tstamp_type;
879 runtime->period_step = params->period_step;
880 runtime->control->avail_min = params->avail_min;
881 runtime->start_threshold = params->start_threshold;
882 runtime->stop_threshold = params->stop_threshold;
883 runtime->silence_threshold = params->silence_threshold;
884 runtime->silence_size = params->silence_size;
885 params->boundary = runtime->boundary;
886 if (snd_pcm_running(substream)) {
887 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
888 runtime->silence_size > 0)
889 snd_pcm_playback_silence(substream, ULONG_MAX);
890 err = snd_pcm_update_state(substream, runtime);
891 }
892 snd_pcm_stream_unlock_irq(substream);
893 return err;
894}
895
896static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
897 struct snd_pcm_sw_params __user * _params)
898{
899 struct snd_pcm_sw_params params;
900 int err;
901 if (copy_from_user(¶ms, _params, sizeof(params)))
902 return -EFAULT;
903 err = snd_pcm_sw_params(substream, ¶ms);
904 if (copy_to_user(_params, ¶ms, sizeof(params)))
905 return -EFAULT;
906 return err;
907}
908
909static inline snd_pcm_uframes_t
910snd_pcm_calc_delay(struct snd_pcm_substream *substream)
911{
912 snd_pcm_uframes_t delay;
913
914 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
915 delay = snd_pcm_playback_hw_avail(substream->runtime);
916 else
917 delay = snd_pcm_capture_avail(substream->runtime);
918 return delay + substream->runtime->delay;
919}
920
921int snd_pcm_status64(struct snd_pcm_substream *substream,
922 struct snd_pcm_status64 *status)
923{
924 struct snd_pcm_runtime *runtime = substream->runtime;
925
926 snd_pcm_stream_lock_irq(substream);
927
928 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
929 &runtime->audio_tstamp_config);
930
931 /* backwards compatible behavior */
932 if (runtime->audio_tstamp_config.type_requested ==
933 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
934 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
935 runtime->audio_tstamp_config.type_requested =
936 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
937 else
938 runtime->audio_tstamp_config.type_requested =
939 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
940 runtime->audio_tstamp_report.valid = 0;
941 } else
942 runtime->audio_tstamp_report.valid = 1;
943
944 status->state = runtime->status->state;
945 status->suspended_state = runtime->status->suspended_state;
946 if (status->state == SNDRV_PCM_STATE_OPEN)
947 goto _end;
948 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
949 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
950 if (snd_pcm_running(substream)) {
951 snd_pcm_update_hw_ptr(substream);
952 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
953 status->tstamp_sec = runtime->status->tstamp.tv_sec;
954 status->tstamp_nsec =
955 runtime->status->tstamp.tv_nsec;
956 status->driver_tstamp_sec =
957 runtime->driver_tstamp.tv_sec;
958 status->driver_tstamp_nsec =
959 runtime->driver_tstamp.tv_nsec;
960 status->audio_tstamp_sec =
961 runtime->status->audio_tstamp.tv_sec;
962 status->audio_tstamp_nsec =
963 runtime->status->audio_tstamp.tv_nsec;
964 if (runtime->audio_tstamp_report.valid == 1)
965 /* backwards compatibility, no report provided in COMPAT mode */
966 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
967 &status->audio_tstamp_accuracy,
968 &runtime->audio_tstamp_report);
969
970 goto _tstamp_end;
971 }
972 } else {
973 /* get tstamp only in fallback mode and only if enabled */
974 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
975 struct timespec64 tstamp;
976
977 snd_pcm_gettime(runtime, &tstamp);
978 status->tstamp_sec = tstamp.tv_sec;
979 status->tstamp_nsec = tstamp.tv_nsec;
980 }
981 }
982 _tstamp_end:
983 status->appl_ptr = runtime->control->appl_ptr;
984 status->hw_ptr = runtime->status->hw_ptr;
985 status->avail = snd_pcm_avail(substream);
986 status->delay = snd_pcm_running(substream) ?
987 snd_pcm_calc_delay(substream) : 0;
988 status->avail_max = runtime->avail_max;
989 status->overrange = runtime->overrange;
990 runtime->avail_max = 0;
991 runtime->overrange = 0;
992 _end:
993 snd_pcm_stream_unlock_irq(substream);
994 return 0;
995}
996
997static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
998 struct snd_pcm_status64 __user * _status,
999 bool ext)
1000{
1001 struct snd_pcm_status64 status;
1002 int res;
1003
1004 memset(&status, 0, sizeof(status));
1005 /*
1006 * with extension, parameters are read/write,
1007 * get audio_tstamp_data from user,
1008 * ignore rest of status structure
1009 */
1010 if (ext && get_user(status.audio_tstamp_data,
1011 (u32 __user *)(&_status->audio_tstamp_data)))
1012 return -EFAULT;
1013 res = snd_pcm_status64(substream, &status);
1014 if (res < 0)
1015 return res;
1016 if (copy_to_user(_status, &status, sizeof(status)))
1017 return -EFAULT;
1018 return 0;
1019}
1020
1021static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1022 struct snd_pcm_status32 __user * _status,
1023 bool ext)
1024{
1025 struct snd_pcm_status64 status64;
1026 struct snd_pcm_status32 status32;
1027 int res;
1028
1029 memset(&status64, 0, sizeof(status64));
1030 memset(&status32, 0, sizeof(status32));
1031 /*
1032 * with extension, parameters are read/write,
1033 * get audio_tstamp_data from user,
1034 * ignore rest of status structure
1035 */
1036 if (ext && get_user(status64.audio_tstamp_data,
1037 (u32 __user *)(&_status->audio_tstamp_data)))
1038 return -EFAULT;
1039 res = snd_pcm_status64(substream, &status64);
1040 if (res < 0)
1041 return res;
1042
1043 status32 = (struct snd_pcm_status32) {
1044 .state = status64.state,
1045 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1046 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1047 .tstamp_sec = status64.tstamp_sec,
1048 .tstamp_nsec = status64.tstamp_nsec,
1049 .appl_ptr = status64.appl_ptr,
1050 .hw_ptr = status64.hw_ptr,
1051 .delay = status64.delay,
1052 .avail = status64.avail,
1053 .avail_max = status64.avail_max,
1054 .overrange = status64.overrange,
1055 .suspended_state = status64.suspended_state,
1056 .audio_tstamp_data = status64.audio_tstamp_data,
1057 .audio_tstamp_sec = status64.audio_tstamp_sec,
1058 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1059 .driver_tstamp_sec = status64.audio_tstamp_sec,
1060 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1061 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1062 };
1063
1064 if (copy_to_user(_status, &status32, sizeof(status32)))
1065 return -EFAULT;
1066
1067 return 0;
1068}
1069
1070static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1071 struct snd_pcm_channel_info * info)
1072{
1073 struct snd_pcm_runtime *runtime;
1074 unsigned int channel;
1075
1076 channel = info->channel;
1077 runtime = substream->runtime;
1078 snd_pcm_stream_lock_irq(substream);
1079 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
1080 snd_pcm_stream_unlock_irq(substream);
1081 return -EBADFD;
1082 }
1083 snd_pcm_stream_unlock_irq(substream);
1084 if (channel >= runtime->channels)
1085 return -EINVAL;
1086 memset(info, 0, sizeof(*info));
1087 info->channel = channel;
1088 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1089}
1090
1091static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1092 struct snd_pcm_channel_info __user * _info)
1093{
1094 struct snd_pcm_channel_info info;
1095 int res;
1096
1097 if (copy_from_user(&info, _info, sizeof(info)))
1098 return -EFAULT;
1099 res = snd_pcm_channel_info(substream, &info);
1100 if (res < 0)
1101 return res;
1102 if (copy_to_user(_info, &info, sizeof(info)))
1103 return -EFAULT;
1104 return 0;
1105}
1106
1107static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1108{
1109 struct snd_pcm_runtime *runtime = substream->runtime;
1110 if (runtime->trigger_master == NULL)
1111 return;
1112 if (runtime->trigger_master == substream) {
1113 if (!runtime->trigger_tstamp_latched)
1114 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1115 } else {
1116 snd_pcm_trigger_tstamp(runtime->trigger_master);
1117 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1118 }
1119 runtime->trigger_master = NULL;
1120}
1121
1122#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
1123
1124struct action_ops {
1125 int (*pre_action)(struct snd_pcm_substream *substream,
1126 snd_pcm_state_t state);
1127 int (*do_action)(struct snd_pcm_substream *substream,
1128 snd_pcm_state_t state);
1129 void (*undo_action)(struct snd_pcm_substream *substream,
1130 snd_pcm_state_t state);
1131 void (*post_action)(struct snd_pcm_substream *substream,
1132 snd_pcm_state_t state);
1133};
1134
1135/*
1136 * this functions is core for handling of linked stream
1137 * Note: the stream state might be changed also on failure
1138 * Note2: call with calling stream lock + link lock
1139 */
1140static int snd_pcm_action_group(const struct action_ops *ops,
1141 struct snd_pcm_substream *substream,
1142 snd_pcm_state_t state,
1143 bool do_lock)
1144{
1145 struct snd_pcm_substream *s = NULL;
1146 struct snd_pcm_substream *s1;
1147 int res = 0, depth = 1;
1148
1149 snd_pcm_group_for_each_entry(s, substream) {
1150 if (do_lock && s != substream) {
1151 if (s->pcm->nonatomic)
1152 mutex_lock_nested(&s->self_group.mutex, depth);
1153 else
1154 spin_lock_nested(&s->self_group.lock, depth);
1155 depth++;
1156 }
1157 res = ops->pre_action(s, state);
1158 if (res < 0)
1159 goto _unlock;
1160 }
1161 snd_pcm_group_for_each_entry(s, substream) {
1162 res = ops->do_action(s, state);
1163 if (res < 0) {
1164 if (ops->undo_action) {
1165 snd_pcm_group_for_each_entry(s1, substream) {
1166 if (s1 == s) /* failed stream */
1167 break;
1168 ops->undo_action(s1, state);
1169 }
1170 }
1171 s = NULL; /* unlock all */
1172 goto _unlock;
1173 }
1174 }
1175 snd_pcm_group_for_each_entry(s, substream) {
1176 ops->post_action(s, state);
1177 }
1178 _unlock:
1179 if (do_lock) {
1180 /* unlock streams */
1181 snd_pcm_group_for_each_entry(s1, substream) {
1182 if (s1 != substream) {
1183 if (s1->pcm->nonatomic)
1184 mutex_unlock(&s1->self_group.mutex);
1185 else
1186 spin_unlock(&s1->self_group.lock);
1187 }
1188 if (s1 == s) /* end */
1189 break;
1190 }
1191 }
1192 return res;
1193}
1194
1195/*
1196 * Note: call with stream lock
1197 */
1198static int snd_pcm_action_single(const struct action_ops *ops,
1199 struct snd_pcm_substream *substream,
1200 snd_pcm_state_t state)
1201{
1202 int res;
1203
1204 res = ops->pre_action(substream, state);
1205 if (res < 0)
1206 return res;
1207 res = ops->do_action(substream, state);
1208 if (res == 0)
1209 ops->post_action(substream, state);
1210 else if (ops->undo_action)
1211 ops->undo_action(substream, state);
1212 return res;
1213}
1214
1215static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1216 struct snd_pcm_group *new_group)
1217{
1218 substream->group = new_group;
1219 list_move(&substream->link_list, &new_group->substreams);
1220}
1221
1222/*
1223 * Unref and unlock the group, but keep the stream lock;
1224 * when the group becomes empty and no longer referred, destroy itself
1225 */
1226static void snd_pcm_group_unref(struct snd_pcm_group *group,
1227 struct snd_pcm_substream *substream)
1228{
1229 bool do_free;
1230
1231 if (!group)
1232 return;
1233 do_free = refcount_dec_and_test(&group->refs);
1234 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1235 if (do_free)
1236 kfree(group);
1237}
1238
1239/*
1240 * Lock the group inside a stream lock and reference it;
1241 * return the locked group object, or NULL if not linked
1242 */
1243static struct snd_pcm_group *
1244snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1245{
1246 bool nonatomic = substream->pcm->nonatomic;
1247 struct snd_pcm_group *group;
1248 bool trylock;
1249
1250 for (;;) {
1251 if (!snd_pcm_stream_linked(substream))
1252 return NULL;
1253 group = substream->group;
1254 /* block freeing the group object */
1255 refcount_inc(&group->refs);
1256
1257 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1258 spin_trylock(&group->lock);
1259 if (trylock)
1260 break; /* OK */
1261
1262 /* re-lock for avoiding ABBA deadlock */
1263 snd_pcm_stream_unlock(substream);
1264 snd_pcm_group_lock(group, nonatomic);
1265 snd_pcm_stream_lock(substream);
1266
1267 /* check the group again; the above opens a small race window */
1268 if (substream->group == group)
1269 break; /* OK */
1270 /* group changed, try again */
1271 snd_pcm_group_unref(group, substream);
1272 }
1273 return group;
1274}
1275
1276/*
1277 * Note: call with stream lock
1278 */
1279static int snd_pcm_action(const struct action_ops *ops,
1280 struct snd_pcm_substream *substream,
1281 snd_pcm_state_t state)
1282{
1283 struct snd_pcm_group *group;
1284 int res;
1285
1286 group = snd_pcm_stream_group_ref(substream);
1287 if (group)
1288 res = snd_pcm_action_group(ops, substream, state, true);
1289 else
1290 res = snd_pcm_action_single(ops, substream, state);
1291 snd_pcm_group_unref(group, substream);
1292 return res;
1293}
1294
1295/*
1296 * Note: don't use any locks before
1297 */
1298static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1299 struct snd_pcm_substream *substream,
1300 snd_pcm_state_t state)
1301{
1302 int res;
1303
1304 snd_pcm_stream_lock_irq(substream);
1305 res = snd_pcm_action(ops, substream, state);
1306 snd_pcm_stream_unlock_irq(substream);
1307 return res;
1308}
1309
1310/*
1311 */
1312static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1313 struct snd_pcm_substream *substream,
1314 snd_pcm_state_t state)
1315{
1316 int res;
1317
1318 /* Guarantee the group members won't change during non-atomic action */
1319 down_read(&snd_pcm_link_rwsem);
1320 if (snd_pcm_stream_linked(substream))
1321 res = snd_pcm_action_group(ops, substream, state, false);
1322 else
1323 res = snd_pcm_action_single(ops, substream, state);
1324 up_read(&snd_pcm_link_rwsem);
1325 return res;
1326}
1327
1328/*
1329 * start callbacks
1330 */
1331static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1332 snd_pcm_state_t state)
1333{
1334 struct snd_pcm_runtime *runtime = substream->runtime;
1335 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
1336 return -EBADFD;
1337 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1338 !snd_pcm_playback_data(substream))
1339 return -EPIPE;
1340 runtime->trigger_tstamp_latched = false;
1341 runtime->trigger_master = substream;
1342 return 0;
1343}
1344
1345static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1346 snd_pcm_state_t state)
1347{
1348 if (substream->runtime->trigger_master != substream)
1349 return 0;
1350 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1351}
1352
1353static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1354 snd_pcm_state_t state)
1355{
1356 if (substream->runtime->trigger_master == substream)
1357 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1358}
1359
1360static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1361 snd_pcm_state_t state)
1362{
1363 struct snd_pcm_runtime *runtime = substream->runtime;
1364 snd_pcm_trigger_tstamp(substream);
1365 runtime->hw_ptr_jiffies = jiffies;
1366 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1367 runtime->rate;
1368 runtime->status->state = state;
1369 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1370 runtime->silence_size > 0)
1371 snd_pcm_playback_silence(substream, ULONG_MAX);
1372 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1373}
1374
1375static const struct action_ops snd_pcm_action_start = {
1376 .pre_action = snd_pcm_pre_start,
1377 .do_action = snd_pcm_do_start,
1378 .undo_action = snd_pcm_undo_start,
1379 .post_action = snd_pcm_post_start
1380};
1381
1382/**
1383 * snd_pcm_start - start all linked streams
1384 * @substream: the PCM substream instance
1385 *
1386 * Return: Zero if successful, or a negative error code.
1387 * The stream lock must be acquired before calling this function.
1388 */
1389int snd_pcm_start(struct snd_pcm_substream *substream)
1390{
1391 return snd_pcm_action(&snd_pcm_action_start, substream,
1392 SNDRV_PCM_STATE_RUNNING);
1393}
1394
1395/* take the stream lock and start the streams */
1396static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1397{
1398 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1399 SNDRV_PCM_STATE_RUNNING);
1400}
1401
1402/*
1403 * stop callbacks
1404 */
1405static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1406 snd_pcm_state_t state)
1407{
1408 struct snd_pcm_runtime *runtime = substream->runtime;
1409 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1410 return -EBADFD;
1411 runtime->trigger_master = substream;
1412 return 0;
1413}
1414
1415static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1416 snd_pcm_state_t state)
1417{
1418 if (substream->runtime->trigger_master == substream &&
1419 snd_pcm_running(substream))
1420 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1421 return 0; /* unconditonally stop all substreams */
1422}
1423
1424static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1425 snd_pcm_state_t state)
1426{
1427 struct snd_pcm_runtime *runtime = substream->runtime;
1428 if (runtime->status->state != state) {
1429 snd_pcm_trigger_tstamp(substream);
1430 runtime->status->state = state;
1431 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1432 }
1433 runtime->stop_operating = true;
1434 wake_up(&runtime->sleep);
1435 wake_up(&runtime->tsleep);
1436}
1437
1438static const struct action_ops snd_pcm_action_stop = {
1439 .pre_action = snd_pcm_pre_stop,
1440 .do_action = snd_pcm_do_stop,
1441 .post_action = snd_pcm_post_stop
1442};
1443
1444/**
1445 * snd_pcm_stop - try to stop all running streams in the substream group
1446 * @substream: the PCM substream instance
1447 * @state: PCM state after stopping the stream
1448 *
1449 * The state of each stream is then changed to the given state unconditionally.
1450 *
1451 * Return: Zero if successful, or a negative error code.
1452 */
1453int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1454{
1455 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1456}
1457EXPORT_SYMBOL(snd_pcm_stop);
1458
1459/**
1460 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1461 * @substream: the PCM substream
1462 *
1463 * After stopping, the state is changed to SETUP.
1464 * Unlike snd_pcm_stop(), this affects only the given stream.
1465 *
1466 * Return: Zero if succesful, or a negative error code.
1467 */
1468int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1469{
1470 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1471 SNDRV_PCM_STATE_SETUP);
1472}
1473
1474/**
1475 * snd_pcm_stop_xrun - stop the running streams as XRUN
1476 * @substream: the PCM substream instance
1477 *
1478 * This stops the given running substream (and all linked substreams) as XRUN.
1479 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1480 *
1481 * Return: Zero if successful, or a negative error code.
1482 */
1483int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1484{
1485 unsigned long flags;
1486
1487 snd_pcm_stream_lock_irqsave(substream, flags);
1488 if (substream->runtime && snd_pcm_running(substream))
1489 __snd_pcm_xrun(substream);
1490 snd_pcm_stream_unlock_irqrestore(substream, flags);
1491 return 0;
1492}
1493EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1494
1495/*
1496 * pause callbacks: pass boolean (to start pause or resume) as state argument
1497 */
1498#define pause_pushed(state) (__force bool)(state)
1499
1500static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1501 snd_pcm_state_t state)
1502{
1503 struct snd_pcm_runtime *runtime = substream->runtime;
1504 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1505 return -ENOSYS;
1506 if (pause_pushed(state)) {
1507 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1508 return -EBADFD;
1509 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1510 return -EBADFD;
1511 runtime->trigger_master = substream;
1512 return 0;
1513}
1514
1515static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1516 snd_pcm_state_t state)
1517{
1518 if (substream->runtime->trigger_master != substream)
1519 return 0;
1520 /* some drivers might use hw_ptr to recover from the pause -
1521 update the hw_ptr now */
1522 if (pause_pushed(state))
1523 snd_pcm_update_hw_ptr(substream);
1524 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1525 * a delta between the current jiffies, this gives a large enough
1526 * delta, effectively to skip the check once.
1527 */
1528 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1529 return substream->ops->trigger(substream,
1530 pause_pushed(state) ?
1531 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1532 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1533}
1534
1535static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1536 snd_pcm_state_t state)
1537{
1538 if (substream->runtime->trigger_master == substream)
1539 substream->ops->trigger(substream,
1540 pause_pushed(state) ?
1541 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1542 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1543}
1544
1545static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1546 snd_pcm_state_t state)
1547{
1548 struct snd_pcm_runtime *runtime = substream->runtime;
1549 snd_pcm_trigger_tstamp(substream);
1550 if (pause_pushed(state)) {
1551 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1552 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1553 wake_up(&runtime->sleep);
1554 wake_up(&runtime->tsleep);
1555 } else {
1556 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1557 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1558 }
1559}
1560
1561static const struct action_ops snd_pcm_action_pause = {
1562 .pre_action = snd_pcm_pre_pause,
1563 .do_action = snd_pcm_do_pause,
1564 .undo_action = snd_pcm_undo_pause,
1565 .post_action = snd_pcm_post_pause
1566};
1567
1568/*
1569 * Push/release the pause for all linked streams.
1570 */
1571static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1572{
1573 return snd_pcm_action(&snd_pcm_action_pause, substream,
1574 (__force snd_pcm_state_t)push);
1575}
1576
1577static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1578 bool push)
1579{
1580 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1581 (__force snd_pcm_state_t)push);
1582}
1583
1584#ifdef CONFIG_PM
1585/* suspend callback: state argument ignored */
1586
1587static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1588 snd_pcm_state_t state)
1589{
1590 struct snd_pcm_runtime *runtime = substream->runtime;
1591 switch (runtime->status->state) {
1592 case SNDRV_PCM_STATE_SUSPENDED:
1593 return -EBUSY;
1594 /* unresumable PCM state; return -EBUSY for skipping suspend */
1595 case SNDRV_PCM_STATE_OPEN:
1596 case SNDRV_PCM_STATE_SETUP:
1597 case SNDRV_PCM_STATE_DISCONNECTED:
1598 return -EBUSY;
1599 }
1600 runtime->trigger_master = substream;
1601 return 0;
1602}
1603
1604static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1605 snd_pcm_state_t state)
1606{
1607 struct snd_pcm_runtime *runtime = substream->runtime;
1608 if (runtime->trigger_master != substream)
1609 return 0;
1610 if (! snd_pcm_running(substream))
1611 return 0;
1612 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1613 return 0; /* suspend unconditionally */
1614}
1615
1616static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1617 snd_pcm_state_t state)
1618{
1619 struct snd_pcm_runtime *runtime = substream->runtime;
1620 snd_pcm_trigger_tstamp(substream);
1621 runtime->status->suspended_state = runtime->status->state;
1622 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1623 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1624 wake_up(&runtime->sleep);
1625 wake_up(&runtime->tsleep);
1626}
1627
1628static const struct action_ops snd_pcm_action_suspend = {
1629 .pre_action = snd_pcm_pre_suspend,
1630 .do_action = snd_pcm_do_suspend,
1631 .post_action = snd_pcm_post_suspend
1632};
1633
1634/*
1635 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1636 * @substream: the PCM substream
1637 *
1638 * After this call, all streams are changed to SUSPENDED state.
1639 *
1640 * Return: Zero if successful, or a negative error code.
1641 */
1642static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1643{
1644 int err;
1645 unsigned long flags;
1646
1647 snd_pcm_stream_lock_irqsave(substream, flags);
1648 err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1649 ACTION_ARG_IGNORE);
1650 snd_pcm_stream_unlock_irqrestore(substream, flags);
1651 return err;
1652}
1653
1654/**
1655 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1656 * @pcm: the PCM instance
1657 *
1658 * After this call, all streams are changed to SUSPENDED state.
1659 *
1660 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1661 */
1662int snd_pcm_suspend_all(struct snd_pcm *pcm)
1663{
1664 struct snd_pcm_substream *substream;
1665 int stream, err = 0;
1666
1667 if (! pcm)
1668 return 0;
1669
1670 for (stream = 0; stream < 2; stream++) {
1671 for (substream = pcm->streams[stream].substream;
1672 substream; substream = substream->next) {
1673 /* FIXME: the open/close code should lock this as well */
1674 if (substream->runtime == NULL)
1675 continue;
1676
1677 /*
1678 * Skip BE dai link PCM's that are internal and may
1679 * not have their substream ops set.
1680 */
1681 if (!substream->ops)
1682 continue;
1683
1684 err = snd_pcm_suspend(substream);
1685 if (err < 0 && err != -EBUSY)
1686 return err;
1687 }
1688 }
1689 return 0;
1690}
1691EXPORT_SYMBOL(snd_pcm_suspend_all);
1692
1693/* resume callbacks: state argument ignored */
1694
1695static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1696 snd_pcm_state_t state)
1697{
1698 struct snd_pcm_runtime *runtime = substream->runtime;
1699 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1700 return -ENOSYS;
1701 runtime->trigger_master = substream;
1702 return 0;
1703}
1704
1705static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1706 snd_pcm_state_t state)
1707{
1708 struct snd_pcm_runtime *runtime = substream->runtime;
1709 if (runtime->trigger_master != substream)
1710 return 0;
1711 /* DMA not running previously? */
1712 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1713 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1714 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1715 return 0;
1716 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1717}
1718
1719static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1720 snd_pcm_state_t state)
1721{
1722 if (substream->runtime->trigger_master == substream &&
1723 snd_pcm_running(substream))
1724 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1725}
1726
1727static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1728 snd_pcm_state_t state)
1729{
1730 struct snd_pcm_runtime *runtime = substream->runtime;
1731 snd_pcm_trigger_tstamp(substream);
1732 runtime->status->state = runtime->status->suspended_state;
1733 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1734 snd_pcm_sync_stop(substream);
1735}
1736
1737static const struct action_ops snd_pcm_action_resume = {
1738 .pre_action = snd_pcm_pre_resume,
1739 .do_action = snd_pcm_do_resume,
1740 .undo_action = snd_pcm_undo_resume,
1741 .post_action = snd_pcm_post_resume
1742};
1743
1744static int snd_pcm_resume(struct snd_pcm_substream *substream)
1745{
1746 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1747 ACTION_ARG_IGNORE);
1748}
1749
1750#else
1751
1752static int snd_pcm_resume(struct snd_pcm_substream *substream)
1753{
1754 return -ENOSYS;
1755}
1756
1757#endif /* CONFIG_PM */
1758
1759/*
1760 * xrun ioctl
1761 *
1762 * Change the RUNNING stream(s) to XRUN state.
1763 */
1764static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1765{
1766 struct snd_pcm_runtime *runtime = substream->runtime;
1767 int result;
1768
1769 snd_pcm_stream_lock_irq(substream);
1770 switch (runtime->status->state) {
1771 case SNDRV_PCM_STATE_XRUN:
1772 result = 0; /* already there */
1773 break;
1774 case SNDRV_PCM_STATE_RUNNING:
1775 __snd_pcm_xrun(substream);
1776 result = 0;
1777 break;
1778 default:
1779 result = -EBADFD;
1780 }
1781 snd_pcm_stream_unlock_irq(substream);
1782 return result;
1783}
1784
1785/*
1786 * reset ioctl
1787 */
1788/* reset callbacks: state argument ignored */
1789static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1790 snd_pcm_state_t state)
1791{
1792 struct snd_pcm_runtime *runtime = substream->runtime;
1793 switch (runtime->status->state) {
1794 case SNDRV_PCM_STATE_RUNNING:
1795 case SNDRV_PCM_STATE_PREPARED:
1796 case SNDRV_PCM_STATE_PAUSED:
1797 case SNDRV_PCM_STATE_SUSPENDED:
1798 return 0;
1799 default:
1800 return -EBADFD;
1801 }
1802}
1803
1804static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1805 snd_pcm_state_t state)
1806{
1807 struct snd_pcm_runtime *runtime = substream->runtime;
1808 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1809 if (err < 0)
1810 return err;
1811 runtime->hw_ptr_base = 0;
1812 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1813 runtime->status->hw_ptr % runtime->period_size;
1814 runtime->silence_start = runtime->status->hw_ptr;
1815 runtime->silence_filled = 0;
1816 return 0;
1817}
1818
1819static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1820 snd_pcm_state_t state)
1821{
1822 struct snd_pcm_runtime *runtime = substream->runtime;
1823 runtime->control->appl_ptr = runtime->status->hw_ptr;
1824 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1825 runtime->silence_size > 0)
1826 snd_pcm_playback_silence(substream, ULONG_MAX);
1827}
1828
1829static const struct action_ops snd_pcm_action_reset = {
1830 .pre_action = snd_pcm_pre_reset,
1831 .do_action = snd_pcm_do_reset,
1832 .post_action = snd_pcm_post_reset
1833};
1834
1835static int snd_pcm_reset(struct snd_pcm_substream *substream)
1836{
1837 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1838 ACTION_ARG_IGNORE);
1839}
1840
1841/*
1842 * prepare ioctl
1843 */
1844/* pass f_flags as state argument */
1845static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1846 snd_pcm_state_t state)
1847{
1848 struct snd_pcm_runtime *runtime = substream->runtime;
1849 int f_flags = (__force int)state;
1850
1851 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1852 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1853 return -EBADFD;
1854 if (snd_pcm_running(substream))
1855 return -EBUSY;
1856 substream->f_flags = f_flags;
1857 return 0;
1858}
1859
1860static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1861 snd_pcm_state_t state)
1862{
1863 int err;
1864 snd_pcm_sync_stop(substream);
1865 err = substream->ops->prepare(substream);
1866 if (err < 0)
1867 return err;
1868 return snd_pcm_do_reset(substream, state);
1869}
1870
1871static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1872 snd_pcm_state_t state)
1873{
1874 struct snd_pcm_runtime *runtime = substream->runtime;
1875 runtime->control->appl_ptr = runtime->status->hw_ptr;
1876 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1877}
1878
1879static const struct action_ops snd_pcm_action_prepare = {
1880 .pre_action = snd_pcm_pre_prepare,
1881 .do_action = snd_pcm_do_prepare,
1882 .post_action = snd_pcm_post_prepare
1883};
1884
1885/**
1886 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1887 * @substream: the PCM substream instance
1888 * @file: file to refer f_flags
1889 *
1890 * Return: Zero if successful, or a negative error code.
1891 */
1892static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1893 struct file *file)
1894{
1895 int f_flags;
1896
1897 if (file)
1898 f_flags = file->f_flags;
1899 else
1900 f_flags = substream->f_flags;
1901
1902 snd_pcm_stream_lock_irq(substream);
1903 switch (substream->runtime->status->state) {
1904 case SNDRV_PCM_STATE_PAUSED:
1905 snd_pcm_pause(substream, false);
1906 fallthrough;
1907 case SNDRV_PCM_STATE_SUSPENDED:
1908 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1909 break;
1910 }
1911 snd_pcm_stream_unlock_irq(substream);
1912
1913 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1914 substream,
1915 (__force snd_pcm_state_t)f_flags);
1916}
1917
1918/*
1919 * drain ioctl
1920 */
1921
1922/* drain init callbacks: state argument ignored */
1923static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
1924 snd_pcm_state_t state)
1925{
1926 struct snd_pcm_runtime *runtime = substream->runtime;
1927 switch (runtime->status->state) {
1928 case SNDRV_PCM_STATE_OPEN:
1929 case SNDRV_PCM_STATE_DISCONNECTED:
1930 case SNDRV_PCM_STATE_SUSPENDED:
1931 return -EBADFD;
1932 }
1933 runtime->trigger_master = substream;
1934 return 0;
1935}
1936
1937static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
1938 snd_pcm_state_t state)
1939{
1940 struct snd_pcm_runtime *runtime = substream->runtime;
1941 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1942 switch (runtime->status->state) {
1943 case SNDRV_PCM_STATE_PREPARED:
1944 /* start playback stream if possible */
1945 if (! snd_pcm_playback_empty(substream)) {
1946 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1947 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1948 } else {
1949 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1950 }
1951 break;
1952 case SNDRV_PCM_STATE_RUNNING:
1953 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1954 break;
1955 case SNDRV_PCM_STATE_XRUN:
1956 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1957 break;
1958 default:
1959 break;
1960 }
1961 } else {
1962 /* stop running stream */
1963 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1964 snd_pcm_state_t new_state;
1965
1966 new_state = snd_pcm_capture_avail(runtime) > 0 ?
1967 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1968 snd_pcm_do_stop(substream, new_state);
1969 snd_pcm_post_stop(substream, new_state);
1970 }
1971 }
1972
1973 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
1974 runtime->trigger_master == substream &&
1975 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
1976 return substream->ops->trigger(substream,
1977 SNDRV_PCM_TRIGGER_DRAIN);
1978
1979 return 0;
1980}
1981
1982static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
1983 snd_pcm_state_t state)
1984{
1985}
1986
1987static const struct action_ops snd_pcm_action_drain_init = {
1988 .pre_action = snd_pcm_pre_drain_init,
1989 .do_action = snd_pcm_do_drain_init,
1990 .post_action = snd_pcm_post_drain_init
1991};
1992
1993/*
1994 * Drain the stream(s).
1995 * When the substream is linked, sync until the draining of all playback streams
1996 * is finished.
1997 * After this call, all streams are supposed to be either SETUP or DRAINING
1998 * (capture only) state.
1999 */
2000static int snd_pcm_drain(struct snd_pcm_substream *substream,
2001 struct file *file)
2002{
2003 struct snd_card *card;
2004 struct snd_pcm_runtime *runtime;
2005 struct snd_pcm_substream *s;
2006 struct snd_pcm_group *group;
2007 wait_queue_entry_t wait;
2008 int result = 0;
2009 int nonblock = 0;
2010
2011 card = substream->pcm->card;
2012 runtime = substream->runtime;
2013
2014 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2015 return -EBADFD;
2016
2017 if (file) {
2018 if (file->f_flags & O_NONBLOCK)
2019 nonblock = 1;
2020 } else if (substream->f_flags & O_NONBLOCK)
2021 nonblock = 1;
2022
2023 snd_pcm_stream_lock_irq(substream);
2024 /* resume pause */
2025 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
2026 snd_pcm_pause(substream, false);
2027
2028 /* pre-start/stop - all running streams are changed to DRAINING state */
2029 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2030 ACTION_ARG_IGNORE);
2031 if (result < 0)
2032 goto unlock;
2033 /* in non-blocking, we don't wait in ioctl but let caller poll */
2034 if (nonblock) {
2035 result = -EAGAIN;
2036 goto unlock;
2037 }
2038
2039 for (;;) {
2040 long tout;
2041 struct snd_pcm_runtime *to_check;
2042 if (signal_pending(current)) {
2043 result = -ERESTARTSYS;
2044 break;
2045 }
2046 /* find a substream to drain */
2047 to_check = NULL;
2048 group = snd_pcm_stream_group_ref(substream);
2049 snd_pcm_group_for_each_entry(s, substream) {
2050 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2051 continue;
2052 runtime = s->runtime;
2053 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2054 to_check = runtime;
2055 break;
2056 }
2057 }
2058 snd_pcm_group_unref(group, substream);
2059 if (!to_check)
2060 break; /* all drained */
2061 init_waitqueue_entry(&wait, current);
2062 set_current_state(TASK_INTERRUPTIBLE);
2063 add_wait_queue(&to_check->sleep, &wait);
2064 snd_pcm_stream_unlock_irq(substream);
2065 if (runtime->no_period_wakeup)
2066 tout = MAX_SCHEDULE_TIMEOUT;
2067 else {
2068 tout = 10;
2069 if (runtime->rate) {
2070 long t = runtime->period_size * 2 / runtime->rate;
2071 tout = max(t, tout);
2072 }
2073 tout = msecs_to_jiffies(tout * 1000);
2074 }
2075 tout = schedule_timeout(tout);
2076
2077 snd_pcm_stream_lock_irq(substream);
2078 group = snd_pcm_stream_group_ref(substream);
2079 snd_pcm_group_for_each_entry(s, substream) {
2080 if (s->runtime == to_check) {
2081 remove_wait_queue(&to_check->sleep, &wait);
2082 break;
2083 }
2084 }
2085 snd_pcm_group_unref(group, substream);
2086
2087 if (card->shutdown) {
2088 result = -ENODEV;
2089 break;
2090 }
2091 if (tout == 0) {
2092 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
2093 result = -ESTRPIPE;
2094 else {
2095 dev_dbg(substream->pcm->card->dev,
2096 "playback drain error (DMA or IRQ trouble?)\n");
2097 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2098 result = -EIO;
2099 }
2100 break;
2101 }
2102 }
2103
2104 unlock:
2105 snd_pcm_stream_unlock_irq(substream);
2106
2107 return result;
2108}
2109
2110/*
2111 * drop ioctl
2112 *
2113 * Immediately put all linked substreams into SETUP state.
2114 */
2115static int snd_pcm_drop(struct snd_pcm_substream *substream)
2116{
2117 struct snd_pcm_runtime *runtime;
2118 int result = 0;
2119
2120 if (PCM_RUNTIME_CHECK(substream))
2121 return -ENXIO;
2122 runtime = substream->runtime;
2123
2124 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2125 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
2126 return -EBADFD;
2127
2128 snd_pcm_stream_lock_irq(substream);
2129 /* resume pause */
2130 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
2131 snd_pcm_pause(substream, false);
2132
2133 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2134 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2135 snd_pcm_stream_unlock_irq(substream);
2136
2137 return result;
2138}
2139
2140
2141static bool is_pcm_file(struct file *file)
2142{
2143 struct inode *inode = file_inode(file);
2144 struct snd_pcm *pcm;
2145 unsigned int minor;
2146
2147 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2148 return false;
2149 minor = iminor(inode);
2150 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2151 if (!pcm)
2152 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2153 if (!pcm)
2154 return false;
2155 snd_card_unref(pcm->card);
2156 return true;
2157}
2158
2159/*
2160 * PCM link handling
2161 */
2162static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2163{
2164 int res = 0;
2165 struct snd_pcm_file *pcm_file;
2166 struct snd_pcm_substream *substream1;
2167 struct snd_pcm_group *group, *target_group;
2168 bool nonatomic = substream->pcm->nonatomic;
2169 struct fd f = fdget(fd);
2170
2171 if (!f.file)
2172 return -EBADFD;
2173 if (!is_pcm_file(f.file)) {
2174 res = -EBADFD;
2175 goto _badf;
2176 }
2177 pcm_file = f.file->private_data;
2178 substream1 = pcm_file->substream;
2179
2180 if (substream == substream1) {
2181 res = -EINVAL;
2182 goto _badf;
2183 }
2184
2185 group = kzalloc(sizeof(*group), GFP_KERNEL);
2186 if (!group) {
2187 res = -ENOMEM;
2188 goto _nolock;
2189 }
2190 snd_pcm_group_init(group);
2191
2192 down_write(&snd_pcm_link_rwsem);
2193 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2194 substream->runtime->status->state != substream1->runtime->status->state ||
2195 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2196 res = -EBADFD;
2197 goto _end;
2198 }
2199 if (snd_pcm_stream_linked(substream1)) {
2200 res = -EALREADY;
2201 goto _end;
2202 }
2203
2204 snd_pcm_stream_lock_irq(substream);
2205 if (!snd_pcm_stream_linked(substream)) {
2206 snd_pcm_group_assign(substream, group);
2207 group = NULL; /* assigned, don't free this one below */
2208 }
2209 target_group = substream->group;
2210 snd_pcm_stream_unlock_irq(substream);
2211
2212 snd_pcm_group_lock_irq(target_group, nonatomic);
2213 snd_pcm_stream_lock_nested(substream1);
2214 snd_pcm_group_assign(substream1, target_group);
2215 refcount_inc(&target_group->refs);
2216 snd_pcm_stream_unlock(substream1);
2217 snd_pcm_group_unlock_irq(target_group, nonatomic);
2218 _end:
2219 up_write(&snd_pcm_link_rwsem);
2220 _nolock:
2221 kfree(group);
2222 _badf:
2223 fdput(f);
2224 return res;
2225}
2226
2227static void relink_to_local(struct snd_pcm_substream *substream)
2228{
2229 snd_pcm_stream_lock_nested(substream);
2230 snd_pcm_group_assign(substream, &substream->self_group);
2231 snd_pcm_stream_unlock(substream);
2232}
2233
2234static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2235{
2236 struct snd_pcm_group *group;
2237 bool nonatomic = substream->pcm->nonatomic;
2238 bool do_free = false;
2239 int res = 0;
2240
2241 down_write(&snd_pcm_link_rwsem);
2242
2243 if (!snd_pcm_stream_linked(substream)) {
2244 res = -EALREADY;
2245 goto _end;
2246 }
2247
2248 group = substream->group;
2249 snd_pcm_group_lock_irq(group, nonatomic);
2250
2251 relink_to_local(substream);
2252 refcount_dec(&group->refs);
2253
2254 /* detach the last stream, too */
2255 if (list_is_singular(&group->substreams)) {
2256 relink_to_local(list_first_entry(&group->substreams,
2257 struct snd_pcm_substream,
2258 link_list));
2259 do_free = refcount_dec_and_test(&group->refs);
2260 }
2261
2262 snd_pcm_group_unlock_irq(group, nonatomic);
2263 if (do_free)
2264 kfree(group);
2265
2266 _end:
2267 up_write(&snd_pcm_link_rwsem);
2268 return res;
2269}
2270
2271/*
2272 * hw configurator
2273 */
2274static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2275 struct snd_pcm_hw_rule *rule)
2276{
2277 struct snd_interval t;
2278 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2279 hw_param_interval_c(params, rule->deps[1]), &t);
2280 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2281}
2282
2283static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2284 struct snd_pcm_hw_rule *rule)
2285{
2286 struct snd_interval t;
2287 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2288 hw_param_interval_c(params, rule->deps[1]), &t);
2289 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2290}
2291
2292static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2293 struct snd_pcm_hw_rule *rule)
2294{
2295 struct snd_interval t;
2296 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2297 hw_param_interval_c(params, rule->deps[1]),
2298 (unsigned long) rule->private, &t);
2299 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2300}
2301
2302static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2303 struct snd_pcm_hw_rule *rule)
2304{
2305 struct snd_interval t;
2306 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2307 (unsigned long) rule->private,
2308 hw_param_interval_c(params, rule->deps[1]), &t);
2309 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2310}
2311
2312static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2313 struct snd_pcm_hw_rule *rule)
2314{
2315 snd_pcm_format_t k;
2316 const struct snd_interval *i =
2317 hw_param_interval_c(params, rule->deps[0]);
2318 struct snd_mask m;
2319 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2320 snd_mask_any(&m);
2321 pcm_for_each_format(k) {
2322 int bits;
2323 if (!snd_mask_test_format(mask, k))
2324 continue;
2325 bits = snd_pcm_format_physical_width(k);
2326 if (bits <= 0)
2327 continue; /* ignore invalid formats */
2328 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2329 snd_mask_reset(&m, (__force unsigned)k);
2330 }
2331 return snd_mask_refine(mask, &m);
2332}
2333
2334static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2335 struct snd_pcm_hw_rule *rule)
2336{
2337 struct snd_interval t;
2338 snd_pcm_format_t k;
2339
2340 t.min = UINT_MAX;
2341 t.max = 0;
2342 t.openmin = 0;
2343 t.openmax = 0;
2344 pcm_for_each_format(k) {
2345 int bits;
2346 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2347 continue;
2348 bits = snd_pcm_format_physical_width(k);
2349 if (bits <= 0)
2350 continue; /* ignore invalid formats */
2351 if (t.min > (unsigned)bits)
2352 t.min = bits;
2353 if (t.max < (unsigned)bits)
2354 t.max = bits;
2355 }
2356 t.integer = 1;
2357 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2358}
2359
2360#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2361#error "Change this table"
2362#endif
2363
2364static const unsigned int rates[] = {
2365 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2366 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2367};
2368
2369const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2370 .count = ARRAY_SIZE(rates),
2371 .list = rates,
2372};
2373
2374static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2375 struct snd_pcm_hw_rule *rule)
2376{
2377 struct snd_pcm_hardware *hw = rule->private;
2378 return snd_interval_list(hw_param_interval(params, rule->var),
2379 snd_pcm_known_rates.count,
2380 snd_pcm_known_rates.list, hw->rates);
2381}
2382
2383static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2384 struct snd_pcm_hw_rule *rule)
2385{
2386 struct snd_interval t;
2387 struct snd_pcm_substream *substream = rule->private;
2388 t.min = 0;
2389 t.max = substream->buffer_bytes_max;
2390 t.openmin = 0;
2391 t.openmax = 0;
2392 t.integer = 1;
2393 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2394}
2395
2396static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2397{
2398 struct snd_pcm_runtime *runtime = substream->runtime;
2399 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2400 int k, err;
2401
2402 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2403 snd_mask_any(constrs_mask(constrs, k));
2404 }
2405
2406 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2407 snd_interval_any(constrs_interval(constrs, k));
2408 }
2409
2410 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2411 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2412 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2413 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2414 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2415
2416 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2417 snd_pcm_hw_rule_format, NULL,
2418 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2419 if (err < 0)
2420 return err;
2421 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2422 snd_pcm_hw_rule_sample_bits, NULL,
2423 SNDRV_PCM_HW_PARAM_FORMAT,
2424 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2425 if (err < 0)
2426 return err;
2427 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2428 snd_pcm_hw_rule_div, NULL,
2429 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2430 if (err < 0)
2431 return err;
2432 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2433 snd_pcm_hw_rule_mul, NULL,
2434 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2435 if (err < 0)
2436 return err;
2437 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2438 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2439 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2440 if (err < 0)
2441 return err;
2442 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2443 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2444 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2445 if (err < 0)
2446 return err;
2447 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2448 snd_pcm_hw_rule_div, NULL,
2449 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2450 if (err < 0)
2451 return err;
2452 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2453 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2454 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2455 if (err < 0)
2456 return err;
2457 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2458 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2459 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2460 if (err < 0)
2461 return err;
2462 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2463 snd_pcm_hw_rule_div, NULL,
2464 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2465 if (err < 0)
2466 return err;
2467 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2468 snd_pcm_hw_rule_div, NULL,
2469 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2470 if (err < 0)
2471 return err;
2472 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2473 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2474 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2475 if (err < 0)
2476 return err;
2477 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2478 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2479 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2480 if (err < 0)
2481 return err;
2482 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2483 snd_pcm_hw_rule_mul, NULL,
2484 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2485 if (err < 0)
2486 return err;
2487 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2488 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2489 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2490 if (err < 0)
2491 return err;
2492 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2493 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2494 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2495 if (err < 0)
2496 return err;
2497 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2498 snd_pcm_hw_rule_muldivk, (void*) 8,
2499 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2500 if (err < 0)
2501 return err;
2502 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2503 snd_pcm_hw_rule_muldivk, (void*) 8,
2504 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2505 if (err < 0)
2506 return err;
2507 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2508 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2509 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2510 if (err < 0)
2511 return err;
2512 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2513 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2514 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2515 if (err < 0)
2516 return err;
2517 return 0;
2518}
2519
2520static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2521{
2522 struct snd_pcm_runtime *runtime = substream->runtime;
2523 struct snd_pcm_hardware *hw = &runtime->hw;
2524 int err;
2525 unsigned int mask = 0;
2526
2527 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2528 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2529 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2530 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2531 if (hw_support_mmap(substream)) {
2532 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2533 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2534 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2535 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2536 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2537 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2538 }
2539 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2540 if (err < 0)
2541 return err;
2542
2543 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2544 if (err < 0)
2545 return err;
2546
2547 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2548 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2549 if (err < 0)
2550 return err;
2551
2552 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2553 hw->channels_min, hw->channels_max);
2554 if (err < 0)
2555 return err;
2556
2557 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2558 hw->rate_min, hw->rate_max);
2559 if (err < 0)
2560 return err;
2561
2562 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2563 hw->period_bytes_min, hw->period_bytes_max);
2564 if (err < 0)
2565 return err;
2566
2567 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2568 hw->periods_min, hw->periods_max);
2569 if (err < 0)
2570 return err;
2571
2572 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2573 hw->period_bytes_min, hw->buffer_bytes_max);
2574 if (err < 0)
2575 return err;
2576
2577 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2578 snd_pcm_hw_rule_buffer_bytes_max, substream,
2579 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2580 if (err < 0)
2581 return err;
2582
2583 /* FIXME: remove */
2584 if (runtime->dma_bytes) {
2585 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2586 if (err < 0)
2587 return err;
2588 }
2589
2590 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2591 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2592 snd_pcm_hw_rule_rate, hw,
2593 SNDRV_PCM_HW_PARAM_RATE, -1);
2594 if (err < 0)
2595 return err;
2596 }
2597
2598 /* FIXME: this belong to lowlevel */
2599 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2600
2601 return 0;
2602}
2603
2604static void pcm_release_private(struct snd_pcm_substream *substream)
2605{
2606 if (snd_pcm_stream_linked(substream))
2607 snd_pcm_unlink(substream);
2608}
2609
2610void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2611{
2612 substream->ref_count--;
2613 if (substream->ref_count > 0)
2614 return;
2615
2616 snd_pcm_drop(substream);
2617 if (substream->hw_opened) {
2618 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2619 do_hw_free(substream);
2620 substream->ops->close(substream);
2621 substream->hw_opened = 0;
2622 }
2623 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2624 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2625 if (substream->pcm_release) {
2626 substream->pcm_release(substream);
2627 substream->pcm_release = NULL;
2628 }
2629 snd_pcm_detach_substream(substream);
2630}
2631EXPORT_SYMBOL(snd_pcm_release_substream);
2632
2633int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2634 struct file *file,
2635 struct snd_pcm_substream **rsubstream)
2636{
2637 struct snd_pcm_substream *substream;
2638 int err;
2639
2640 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2641 if (err < 0)
2642 return err;
2643 if (substream->ref_count > 1) {
2644 *rsubstream = substream;
2645 return 0;
2646 }
2647
2648 err = snd_pcm_hw_constraints_init(substream);
2649 if (err < 0) {
2650 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2651 goto error;
2652 }
2653
2654 if ((err = substream->ops->open(substream)) < 0)
2655 goto error;
2656
2657 substream->hw_opened = 1;
2658
2659 err = snd_pcm_hw_constraints_complete(substream);
2660 if (err < 0) {
2661 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2662 goto error;
2663 }
2664
2665 *rsubstream = substream;
2666 return 0;
2667
2668 error:
2669 snd_pcm_release_substream(substream);
2670 return err;
2671}
2672EXPORT_SYMBOL(snd_pcm_open_substream);
2673
2674static int snd_pcm_open_file(struct file *file,
2675 struct snd_pcm *pcm,
2676 int stream)
2677{
2678 struct snd_pcm_file *pcm_file;
2679 struct snd_pcm_substream *substream;
2680 int err;
2681
2682 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2683 if (err < 0)
2684 return err;
2685
2686 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2687 if (pcm_file == NULL) {
2688 snd_pcm_release_substream(substream);
2689 return -ENOMEM;
2690 }
2691 pcm_file->substream = substream;
2692 if (substream->ref_count == 1)
2693 substream->pcm_release = pcm_release_private;
2694 file->private_data = pcm_file;
2695
2696 return 0;
2697}
2698
2699static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2700{
2701 struct snd_pcm *pcm;
2702 int err = nonseekable_open(inode, file);
2703 if (err < 0)
2704 return err;
2705 pcm = snd_lookup_minor_data(iminor(inode),
2706 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2707 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2708 if (pcm)
2709 snd_card_unref(pcm->card);
2710 return err;
2711}
2712
2713static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2714{
2715 struct snd_pcm *pcm;
2716 int err = nonseekable_open(inode, file);
2717 if (err < 0)
2718 return err;
2719 pcm = snd_lookup_minor_data(iminor(inode),
2720 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2721 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2722 if (pcm)
2723 snd_card_unref(pcm->card);
2724 return err;
2725}
2726
2727static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2728{
2729 int err;
2730 wait_queue_entry_t wait;
2731
2732 if (pcm == NULL) {
2733 err = -ENODEV;
2734 goto __error1;
2735 }
2736 err = snd_card_file_add(pcm->card, file);
2737 if (err < 0)
2738 goto __error1;
2739 if (!try_module_get(pcm->card->module)) {
2740 err = -EFAULT;
2741 goto __error2;
2742 }
2743 init_waitqueue_entry(&wait, current);
2744 add_wait_queue(&pcm->open_wait, &wait);
2745 mutex_lock(&pcm->open_mutex);
2746 while (1) {
2747 err = snd_pcm_open_file(file, pcm, stream);
2748 if (err >= 0)
2749 break;
2750 if (err == -EAGAIN) {
2751 if (file->f_flags & O_NONBLOCK) {
2752 err = -EBUSY;
2753 break;
2754 }
2755 } else
2756 break;
2757 set_current_state(TASK_INTERRUPTIBLE);
2758 mutex_unlock(&pcm->open_mutex);
2759 schedule();
2760 mutex_lock(&pcm->open_mutex);
2761 if (pcm->card->shutdown) {
2762 err = -ENODEV;
2763 break;
2764 }
2765 if (signal_pending(current)) {
2766 err = -ERESTARTSYS;
2767 break;
2768 }
2769 }
2770 remove_wait_queue(&pcm->open_wait, &wait);
2771 mutex_unlock(&pcm->open_mutex);
2772 if (err < 0)
2773 goto __error;
2774 return err;
2775
2776 __error:
2777 module_put(pcm->card->module);
2778 __error2:
2779 snd_card_file_remove(pcm->card, file);
2780 __error1:
2781 return err;
2782}
2783
2784static int snd_pcm_release(struct inode *inode, struct file *file)
2785{
2786 struct snd_pcm *pcm;
2787 struct snd_pcm_substream *substream;
2788 struct snd_pcm_file *pcm_file;
2789
2790 pcm_file = file->private_data;
2791 substream = pcm_file->substream;
2792 if (snd_BUG_ON(!substream))
2793 return -ENXIO;
2794 pcm = substream->pcm;
2795 mutex_lock(&pcm->open_mutex);
2796 snd_pcm_release_substream(substream);
2797 kfree(pcm_file);
2798 mutex_unlock(&pcm->open_mutex);
2799 wake_up(&pcm->open_wait);
2800 module_put(pcm->card->module);
2801 snd_card_file_remove(pcm->card, file);
2802 return 0;
2803}
2804
2805/* check and update PCM state; return 0 or a negative error
2806 * call this inside PCM lock
2807 */
2808static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2809{
2810 switch (substream->runtime->status->state) {
2811 case SNDRV_PCM_STATE_DRAINING:
2812 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2813 return -EBADFD;
2814 fallthrough;
2815 case SNDRV_PCM_STATE_RUNNING:
2816 return snd_pcm_update_hw_ptr(substream);
2817 case SNDRV_PCM_STATE_PREPARED:
2818 case SNDRV_PCM_STATE_PAUSED:
2819 return 0;
2820 case SNDRV_PCM_STATE_SUSPENDED:
2821 return -ESTRPIPE;
2822 case SNDRV_PCM_STATE_XRUN:
2823 return -EPIPE;
2824 default:
2825 return -EBADFD;
2826 }
2827}
2828
2829/* increase the appl_ptr; returns the processed frames or a negative error */
2830static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2831 snd_pcm_uframes_t frames,
2832 snd_pcm_sframes_t avail)
2833{
2834 struct snd_pcm_runtime *runtime = substream->runtime;
2835 snd_pcm_sframes_t appl_ptr;
2836 int ret;
2837
2838 if (avail <= 0)
2839 return 0;
2840 if (frames > (snd_pcm_uframes_t)avail)
2841 frames = avail;
2842 appl_ptr = runtime->control->appl_ptr + frames;
2843 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2844 appl_ptr -= runtime->boundary;
2845 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2846 return ret < 0 ? ret : frames;
2847}
2848
2849/* decrease the appl_ptr; returns the processed frames or zero for error */
2850static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2851 snd_pcm_uframes_t frames,
2852 snd_pcm_sframes_t avail)
2853{
2854 struct snd_pcm_runtime *runtime = substream->runtime;
2855 snd_pcm_sframes_t appl_ptr;
2856 int ret;
2857
2858 if (avail <= 0)
2859 return 0;
2860 if (frames > (snd_pcm_uframes_t)avail)
2861 frames = avail;
2862 appl_ptr = runtime->control->appl_ptr - frames;
2863 if (appl_ptr < 0)
2864 appl_ptr += runtime->boundary;
2865 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2866 /* NOTE: we return zero for errors because PulseAudio gets depressed
2867 * upon receiving an error from rewind ioctl and stops processing
2868 * any longer. Returning zero means that no rewind is done, so
2869 * it's not absolutely wrong to answer like that.
2870 */
2871 return ret < 0 ? 0 : frames;
2872}
2873
2874static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2875 snd_pcm_uframes_t frames)
2876{
2877 snd_pcm_sframes_t ret;
2878
2879 if (frames == 0)
2880 return 0;
2881
2882 snd_pcm_stream_lock_irq(substream);
2883 ret = do_pcm_hwsync(substream);
2884 if (!ret)
2885 ret = rewind_appl_ptr(substream, frames,
2886 snd_pcm_hw_avail(substream));
2887 snd_pcm_stream_unlock_irq(substream);
2888 return ret;
2889}
2890
2891static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2892 snd_pcm_uframes_t frames)
2893{
2894 snd_pcm_sframes_t ret;
2895
2896 if (frames == 0)
2897 return 0;
2898
2899 snd_pcm_stream_lock_irq(substream);
2900 ret = do_pcm_hwsync(substream);
2901 if (!ret)
2902 ret = forward_appl_ptr(substream, frames,
2903 snd_pcm_avail(substream));
2904 snd_pcm_stream_unlock_irq(substream);
2905 return ret;
2906}
2907
2908static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2909{
2910 int err;
2911
2912 snd_pcm_stream_lock_irq(substream);
2913 err = do_pcm_hwsync(substream);
2914 snd_pcm_stream_unlock_irq(substream);
2915 return err;
2916}
2917
2918static int snd_pcm_delay(struct snd_pcm_substream *substream,
2919 snd_pcm_sframes_t *delay)
2920{
2921 int err;
2922 snd_pcm_sframes_t n = 0;
2923
2924 snd_pcm_stream_lock_irq(substream);
2925 err = do_pcm_hwsync(substream);
2926 if (!err)
2927 n = snd_pcm_calc_delay(substream);
2928 snd_pcm_stream_unlock_irq(substream);
2929 if (!err)
2930 *delay = n;
2931 return err;
2932}
2933
2934static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2935 struct snd_pcm_sync_ptr __user *_sync_ptr)
2936{
2937 struct snd_pcm_runtime *runtime = substream->runtime;
2938 struct snd_pcm_sync_ptr sync_ptr;
2939 volatile struct snd_pcm_mmap_status *status;
2940 volatile struct snd_pcm_mmap_control *control;
2941 int err;
2942
2943 memset(&sync_ptr, 0, sizeof(sync_ptr));
2944 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2945 return -EFAULT;
2946 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2947 return -EFAULT;
2948 status = runtime->status;
2949 control = runtime->control;
2950 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2951 err = snd_pcm_hwsync(substream);
2952 if (err < 0)
2953 return err;
2954 }
2955 snd_pcm_stream_lock_irq(substream);
2956 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
2957 err = pcm_lib_apply_appl_ptr(substream,
2958 sync_ptr.c.control.appl_ptr);
2959 if (err < 0) {
2960 snd_pcm_stream_unlock_irq(substream);
2961 return err;
2962 }
2963 } else {
2964 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2965 }
2966 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2967 control->avail_min = sync_ptr.c.control.avail_min;
2968 else
2969 sync_ptr.c.control.avail_min = control->avail_min;
2970 sync_ptr.s.status.state = status->state;
2971 sync_ptr.s.status.hw_ptr = status->hw_ptr;
2972 sync_ptr.s.status.tstamp = status->tstamp;
2973 sync_ptr.s.status.suspended_state = status->suspended_state;
2974 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
2975 snd_pcm_stream_unlock_irq(substream);
2976 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2977 return -EFAULT;
2978 return 0;
2979}
2980
2981struct snd_pcm_mmap_status32 {
2982 snd_pcm_state_t state;
2983 s32 pad1;
2984 u32 hw_ptr;
2985 s32 tstamp_sec;
2986 s32 tstamp_nsec;
2987 snd_pcm_state_t suspended_state;
2988 s32 audio_tstamp_sec;
2989 s32 audio_tstamp_nsec;
2990} __attribute__((packed));
2991
2992struct snd_pcm_mmap_control32 {
2993 u32 appl_ptr;
2994 u32 avail_min;
2995};
2996
2997struct snd_pcm_sync_ptr32 {
2998 u32 flags;
2999 union {
3000 struct snd_pcm_mmap_status32 status;
3001 unsigned char reserved[64];
3002 } s;
3003 union {
3004 struct snd_pcm_mmap_control32 control;
3005 unsigned char reserved[64];
3006 } c;
3007} __attribute__((packed));
3008
3009/* recalcuate the boundary within 32bit */
3010static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3011{
3012 snd_pcm_uframes_t boundary;
3013
3014 if (! runtime->buffer_size)
3015 return 0;
3016 boundary = runtime->buffer_size;
3017 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3018 boundary *= 2;
3019 return boundary;
3020}
3021
3022static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3023 struct snd_pcm_sync_ptr32 __user *src)
3024{
3025 struct snd_pcm_runtime *runtime = substream->runtime;
3026 volatile struct snd_pcm_mmap_status *status;
3027 volatile struct snd_pcm_mmap_control *control;
3028 u32 sflags;
3029 struct snd_pcm_mmap_control scontrol;
3030 struct snd_pcm_mmap_status sstatus;
3031 snd_pcm_uframes_t boundary;
3032 int err;
3033
3034 if (snd_BUG_ON(!runtime))
3035 return -EINVAL;
3036
3037 if (get_user(sflags, &src->flags) ||
3038 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3039 get_user(scontrol.avail_min, &src->c.control.avail_min))
3040 return -EFAULT;
3041 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3042 err = snd_pcm_hwsync(substream);
3043 if (err < 0)
3044 return err;
3045 }
3046 status = runtime->status;
3047 control = runtime->control;
3048 boundary = recalculate_boundary(runtime);
3049 if (! boundary)
3050 boundary = 0x7fffffff;
3051 snd_pcm_stream_lock_irq(substream);
3052 /* FIXME: we should consider the boundary for the sync from app */
3053 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3054 control->appl_ptr = scontrol.appl_ptr;
3055 else
3056 scontrol.appl_ptr = control->appl_ptr % boundary;
3057 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3058 control->avail_min = scontrol.avail_min;
3059 else
3060 scontrol.avail_min = control->avail_min;
3061 sstatus.state = status->state;
3062 sstatus.hw_ptr = status->hw_ptr % boundary;
3063 sstatus.tstamp = status->tstamp;
3064 sstatus.suspended_state = status->suspended_state;
3065 sstatus.audio_tstamp = status->audio_tstamp;
3066 snd_pcm_stream_unlock_irq(substream);
3067 if (put_user(sstatus.state, &src->s.status.state) ||
3068 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3069 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3070 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3071 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3072 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3073 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3074 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3075 put_user(scontrol.avail_min, &src->c.control.avail_min))
3076 return -EFAULT;
3077
3078 return 0;
3079}
3080#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3081
3082static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3083{
3084 struct snd_pcm_runtime *runtime = substream->runtime;
3085 int arg;
3086
3087 if (get_user(arg, _arg))
3088 return -EFAULT;
3089 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3090 return -EINVAL;
3091 runtime->tstamp_type = arg;
3092 return 0;
3093}
3094
3095static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3096 struct snd_xferi __user *_xferi)
3097{
3098 struct snd_xferi xferi;
3099 struct snd_pcm_runtime *runtime = substream->runtime;
3100 snd_pcm_sframes_t result;
3101
3102 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3103 return -EBADFD;
3104 if (put_user(0, &_xferi->result))
3105 return -EFAULT;
3106 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3107 return -EFAULT;
3108 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3109 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3110 else
3111 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3112 if (put_user(result, &_xferi->result))
3113 return -EFAULT;
3114 return result < 0 ? result : 0;
3115}
3116
3117static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3118 struct snd_xfern __user *_xfern)
3119{
3120 struct snd_xfern xfern;
3121 struct snd_pcm_runtime *runtime = substream->runtime;
3122 void *bufs;
3123 snd_pcm_sframes_t result;
3124
3125 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3126 return -EBADFD;
3127 if (runtime->channels > 128)
3128 return -EINVAL;
3129 if (put_user(0, &_xfern->result))
3130 return -EFAULT;
3131 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3132 return -EFAULT;
3133
3134 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3135 if (IS_ERR(bufs))
3136 return PTR_ERR(bufs);
3137 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3138 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3139 else
3140 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3141 kfree(bufs);
3142 if (put_user(result, &_xfern->result))
3143 return -EFAULT;
3144 return result < 0 ? result : 0;
3145}
3146
3147static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3148 snd_pcm_uframes_t __user *_frames)
3149{
3150 snd_pcm_uframes_t frames;
3151 snd_pcm_sframes_t result;
3152
3153 if (get_user(frames, _frames))
3154 return -EFAULT;
3155 if (put_user(0, _frames))
3156 return -EFAULT;
3157 result = snd_pcm_rewind(substream, frames);
3158 if (put_user(result, _frames))
3159 return -EFAULT;
3160 return result < 0 ? result : 0;
3161}
3162
3163static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3164 snd_pcm_uframes_t __user *_frames)
3165{
3166 snd_pcm_uframes_t frames;
3167 snd_pcm_sframes_t result;
3168
3169 if (get_user(frames, _frames))
3170 return -EFAULT;
3171 if (put_user(0, _frames))
3172 return -EFAULT;
3173 result = snd_pcm_forward(substream, frames);
3174 if (put_user(result, _frames))
3175 return -EFAULT;
3176 return result < 0 ? result : 0;
3177}
3178
3179static int snd_pcm_common_ioctl(struct file *file,
3180 struct snd_pcm_substream *substream,
3181 unsigned int cmd, void __user *arg)
3182{
3183 struct snd_pcm_file *pcm_file = file->private_data;
3184 int res;
3185
3186 if (PCM_RUNTIME_CHECK(substream))
3187 return -ENXIO;
3188
3189 res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0);
3190 if (res < 0)
3191 return res;
3192
3193 switch (cmd) {
3194 case SNDRV_PCM_IOCTL_PVERSION:
3195 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3196 case SNDRV_PCM_IOCTL_INFO:
3197 return snd_pcm_info_user(substream, arg);
3198 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3199 return 0;
3200 case SNDRV_PCM_IOCTL_TTSTAMP:
3201 return snd_pcm_tstamp(substream, arg);
3202 case SNDRV_PCM_IOCTL_USER_PVERSION:
3203 if (get_user(pcm_file->user_pversion,
3204 (unsigned int __user *)arg))
3205 return -EFAULT;
3206 return 0;
3207 case SNDRV_PCM_IOCTL_HW_REFINE:
3208 return snd_pcm_hw_refine_user(substream, arg);
3209 case SNDRV_PCM_IOCTL_HW_PARAMS:
3210 return snd_pcm_hw_params_user(substream, arg);
3211 case SNDRV_PCM_IOCTL_HW_FREE:
3212 return snd_pcm_hw_free(substream);
3213 case SNDRV_PCM_IOCTL_SW_PARAMS:
3214 return snd_pcm_sw_params_user(substream, arg);
3215 case SNDRV_PCM_IOCTL_STATUS32:
3216 return snd_pcm_status_user32(substream, arg, false);
3217 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3218 return snd_pcm_status_user32(substream, arg, true);
3219 case SNDRV_PCM_IOCTL_STATUS64:
3220 return snd_pcm_status_user64(substream, arg, false);
3221 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3222 return snd_pcm_status_user64(substream, arg, true);
3223 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3224 return snd_pcm_channel_info_user(substream, arg);
3225 case SNDRV_PCM_IOCTL_PREPARE:
3226 return snd_pcm_prepare(substream, file);
3227 case SNDRV_PCM_IOCTL_RESET:
3228 return snd_pcm_reset(substream);
3229 case SNDRV_PCM_IOCTL_START:
3230 return snd_pcm_start_lock_irq(substream);
3231 case SNDRV_PCM_IOCTL_LINK:
3232 return snd_pcm_link(substream, (int)(unsigned long) arg);
3233 case SNDRV_PCM_IOCTL_UNLINK:
3234 return snd_pcm_unlink(substream);
3235 case SNDRV_PCM_IOCTL_RESUME:
3236 return snd_pcm_resume(substream);
3237 case SNDRV_PCM_IOCTL_XRUN:
3238 return snd_pcm_xrun(substream);
3239 case SNDRV_PCM_IOCTL_HWSYNC:
3240 return snd_pcm_hwsync(substream);
3241 case SNDRV_PCM_IOCTL_DELAY:
3242 {
3243 snd_pcm_sframes_t delay;
3244 snd_pcm_sframes_t __user *res = arg;
3245 int err;
3246
3247 err = snd_pcm_delay(substream, &delay);
3248 if (err)
3249 return err;
3250 if (put_user(delay, res))
3251 return -EFAULT;
3252 return 0;
3253 }
3254 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3255 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3256 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3257 return snd_pcm_sync_ptr(substream, arg);
3258#ifdef CONFIG_SND_SUPPORT_OLD_API
3259 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3260 return snd_pcm_hw_refine_old_user(substream, arg);
3261 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3262 return snd_pcm_hw_params_old_user(substream, arg);
3263#endif
3264 case SNDRV_PCM_IOCTL_DRAIN:
3265 return snd_pcm_drain(substream, file);
3266 case SNDRV_PCM_IOCTL_DROP:
3267 return snd_pcm_drop(substream);
3268 case SNDRV_PCM_IOCTL_PAUSE:
3269 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3270 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3271 case SNDRV_PCM_IOCTL_READI_FRAMES:
3272 return snd_pcm_xferi_frames_ioctl(substream, arg);
3273 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3274 case SNDRV_PCM_IOCTL_READN_FRAMES:
3275 return snd_pcm_xfern_frames_ioctl(substream, arg);
3276 case SNDRV_PCM_IOCTL_REWIND:
3277 return snd_pcm_rewind_ioctl(substream, arg);
3278 case SNDRV_PCM_IOCTL_FORWARD:
3279 return snd_pcm_forward_ioctl(substream, arg);
3280 }
3281 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3282 return -ENOTTY;
3283}
3284
3285static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3286 unsigned long arg)
3287{
3288 struct snd_pcm_file *pcm_file;
3289
3290 pcm_file = file->private_data;
3291
3292 if (((cmd >> 8) & 0xff) != 'A')
3293 return -ENOTTY;
3294
3295 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3296 (void __user *)arg);
3297}
3298
3299/**
3300 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3301 * @substream: PCM substream
3302 * @cmd: IOCTL cmd
3303 * @arg: IOCTL argument
3304 *
3305 * The function is provided primarily for OSS layer and USB gadget drivers,
3306 * and it allows only the limited set of ioctls (hw_params, sw_params,
3307 * prepare, start, drain, drop, forward).
3308 */
3309int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3310 unsigned int cmd, void *arg)
3311{
3312 snd_pcm_uframes_t *frames = arg;
3313 snd_pcm_sframes_t result;
3314
3315 switch (cmd) {
3316 case SNDRV_PCM_IOCTL_FORWARD:
3317 {
3318 /* provided only for OSS; capture-only and no value returned */
3319 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3320 return -EINVAL;
3321 result = snd_pcm_forward(substream, *frames);
3322 return result < 0 ? result : 0;
3323 }
3324 case SNDRV_PCM_IOCTL_HW_PARAMS:
3325 return snd_pcm_hw_params(substream, arg);
3326 case SNDRV_PCM_IOCTL_SW_PARAMS:
3327 return snd_pcm_sw_params(substream, arg);
3328 case SNDRV_PCM_IOCTL_PREPARE:
3329 return snd_pcm_prepare(substream, NULL);
3330 case SNDRV_PCM_IOCTL_START:
3331 return snd_pcm_start_lock_irq(substream);
3332 case SNDRV_PCM_IOCTL_DRAIN:
3333 return snd_pcm_drain(substream, NULL);
3334 case SNDRV_PCM_IOCTL_DROP:
3335 return snd_pcm_drop(substream);
3336 case SNDRV_PCM_IOCTL_DELAY:
3337 return snd_pcm_delay(substream, frames);
3338 default:
3339 return -EINVAL;
3340 }
3341}
3342EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3343
3344static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3345 loff_t * offset)
3346{
3347 struct snd_pcm_file *pcm_file;
3348 struct snd_pcm_substream *substream;
3349 struct snd_pcm_runtime *runtime;
3350 snd_pcm_sframes_t result;
3351
3352 pcm_file = file->private_data;
3353 substream = pcm_file->substream;
3354 if (PCM_RUNTIME_CHECK(substream))
3355 return -ENXIO;
3356 runtime = substream->runtime;
3357 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3358 return -EBADFD;
3359 if (!frame_aligned(runtime, count))
3360 return -EINVAL;
3361 count = bytes_to_frames(runtime, count);
3362 result = snd_pcm_lib_read(substream, buf, count);
3363 if (result > 0)
3364 result = frames_to_bytes(runtime, result);
3365 return result;
3366}
3367
3368static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3369 size_t count, loff_t * offset)
3370{
3371 struct snd_pcm_file *pcm_file;
3372 struct snd_pcm_substream *substream;
3373 struct snd_pcm_runtime *runtime;
3374 snd_pcm_sframes_t result;
3375
3376 pcm_file = file->private_data;
3377 substream = pcm_file->substream;
3378 if (PCM_RUNTIME_CHECK(substream))
3379 return -ENXIO;
3380 runtime = substream->runtime;
3381 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3382 return -EBADFD;
3383 if (!frame_aligned(runtime, count))
3384 return -EINVAL;
3385 count = bytes_to_frames(runtime, count);
3386 result = snd_pcm_lib_write(substream, buf, count);
3387 if (result > 0)
3388 result = frames_to_bytes(runtime, result);
3389 return result;
3390}
3391
3392static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3393{
3394 struct snd_pcm_file *pcm_file;
3395 struct snd_pcm_substream *substream;
3396 struct snd_pcm_runtime *runtime;
3397 snd_pcm_sframes_t result;
3398 unsigned long i;
3399 void __user **bufs;
3400 snd_pcm_uframes_t frames;
3401
3402 pcm_file = iocb->ki_filp->private_data;
3403 substream = pcm_file->substream;
3404 if (PCM_RUNTIME_CHECK(substream))
3405 return -ENXIO;
3406 runtime = substream->runtime;
3407 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3408 return -EBADFD;
3409 if (!iter_is_iovec(to))
3410 return -EINVAL;
3411 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3412 return -EINVAL;
3413 if (!frame_aligned(runtime, to->iov->iov_len))
3414 return -EINVAL;
3415 frames = bytes_to_samples(runtime, to->iov->iov_len);
3416 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3417 if (bufs == NULL)
3418 return -ENOMEM;
3419 for (i = 0; i < to->nr_segs; ++i)
3420 bufs[i] = to->iov[i].iov_base;
3421 result = snd_pcm_lib_readv(substream, bufs, frames);
3422 if (result > 0)
3423 result = frames_to_bytes(runtime, result);
3424 kfree(bufs);
3425 return result;
3426}
3427
3428static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3429{
3430 struct snd_pcm_file *pcm_file;
3431 struct snd_pcm_substream *substream;
3432 struct snd_pcm_runtime *runtime;
3433 snd_pcm_sframes_t result;
3434 unsigned long i;
3435 void __user **bufs;
3436 snd_pcm_uframes_t frames;
3437
3438 pcm_file = iocb->ki_filp->private_data;
3439 substream = pcm_file->substream;
3440 if (PCM_RUNTIME_CHECK(substream))
3441 return -ENXIO;
3442 runtime = substream->runtime;
3443 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3444 return -EBADFD;
3445 if (!iter_is_iovec(from))
3446 return -EINVAL;
3447 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3448 !frame_aligned(runtime, from->iov->iov_len))
3449 return -EINVAL;
3450 frames = bytes_to_samples(runtime, from->iov->iov_len);
3451 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3452 if (bufs == NULL)
3453 return -ENOMEM;
3454 for (i = 0; i < from->nr_segs; ++i)
3455 bufs[i] = from->iov[i].iov_base;
3456 result = snd_pcm_lib_writev(substream, bufs, frames);
3457 if (result > 0)
3458 result = frames_to_bytes(runtime, result);
3459 kfree(bufs);
3460 return result;
3461}
3462
3463static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3464{
3465 struct snd_pcm_file *pcm_file;
3466 struct snd_pcm_substream *substream;
3467 struct snd_pcm_runtime *runtime;
3468 __poll_t mask, ok;
3469 snd_pcm_uframes_t avail;
3470
3471 pcm_file = file->private_data;
3472
3473 substream = pcm_file->substream;
3474 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3475 ok = EPOLLOUT | EPOLLWRNORM;
3476 else
3477 ok = EPOLLIN | EPOLLRDNORM;
3478 if (PCM_RUNTIME_CHECK(substream))
3479 return ok | EPOLLERR;
3480
3481 runtime = substream->runtime;
3482 poll_wait(file, &runtime->sleep, wait);
3483
3484 mask = 0;
3485 snd_pcm_stream_lock_irq(substream);
3486 avail = snd_pcm_avail(substream);
3487 switch (runtime->status->state) {
3488 case SNDRV_PCM_STATE_RUNNING:
3489 case SNDRV_PCM_STATE_PREPARED:
3490 case SNDRV_PCM_STATE_PAUSED:
3491 if (avail >= runtime->control->avail_min)
3492 mask = ok;
3493 break;
3494 case SNDRV_PCM_STATE_DRAINING:
3495 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3496 mask = ok;
3497 if (!avail)
3498 mask |= EPOLLERR;
3499 }
3500 break;
3501 default:
3502 mask = ok | EPOLLERR;
3503 break;
3504 }
3505 snd_pcm_stream_unlock_irq(substream);
3506 return mask;
3507}
3508
3509/*
3510 * mmap support
3511 */
3512
3513/*
3514 * Only on coherent architectures, we can mmap the status and the control records
3515 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3516 */
3517#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3518/*
3519 * mmap status record
3520 */
3521static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3522{
3523 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3524 struct snd_pcm_runtime *runtime;
3525
3526 if (substream == NULL)
3527 return VM_FAULT_SIGBUS;
3528 runtime = substream->runtime;
3529 vmf->page = virt_to_page(runtime->status);
3530 get_page(vmf->page);
3531 return 0;
3532}
3533
3534static const struct vm_operations_struct snd_pcm_vm_ops_status =
3535{
3536 .fault = snd_pcm_mmap_status_fault,
3537};
3538
3539static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3540 struct vm_area_struct *area)
3541{
3542 long size;
3543 if (!(area->vm_flags & VM_READ))
3544 return -EINVAL;
3545 size = area->vm_end - area->vm_start;
3546 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3547 return -EINVAL;
3548 area->vm_ops = &snd_pcm_vm_ops_status;
3549 area->vm_private_data = substream;
3550 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3551 return 0;
3552}
3553
3554/*
3555 * mmap control record
3556 */
3557static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3558{
3559 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3560 struct snd_pcm_runtime *runtime;
3561
3562 if (substream == NULL)
3563 return VM_FAULT_SIGBUS;
3564 runtime = substream->runtime;
3565 vmf->page = virt_to_page(runtime->control);
3566 get_page(vmf->page);
3567 return 0;
3568}
3569
3570static const struct vm_operations_struct snd_pcm_vm_ops_control =
3571{
3572 .fault = snd_pcm_mmap_control_fault,
3573};
3574
3575static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3576 struct vm_area_struct *area)
3577{
3578 long size;
3579 if (!(area->vm_flags & VM_READ))
3580 return -EINVAL;
3581 size = area->vm_end - area->vm_start;
3582 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3583 return -EINVAL;
3584 area->vm_ops = &snd_pcm_vm_ops_control;
3585 area->vm_private_data = substream;
3586 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3587 return 0;
3588}
3589
3590static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3591{
3592 /* See pcm_control_mmap_allowed() below.
3593 * Since older alsa-lib requires both status and control mmaps to be
3594 * coupled, we have to disable the status mmap for old alsa-lib, too.
3595 */
3596 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3597 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3598 return false;
3599 return true;
3600}
3601
3602static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3603{
3604 if (pcm_file->no_compat_mmap)
3605 return false;
3606 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3607 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3608 * thus it effectively assures the manual update of appl_ptr.
3609 */
3610 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3611 return false;
3612 return true;
3613}
3614
3615#else /* ! coherent mmap */
3616/*
3617 * don't support mmap for status and control records.
3618 */
3619#define pcm_status_mmap_allowed(pcm_file) false
3620#define pcm_control_mmap_allowed(pcm_file) false
3621
3622static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3623 struct vm_area_struct *area)
3624{
3625 return -ENXIO;
3626}
3627static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3628 struct vm_area_struct *area)
3629{
3630 return -ENXIO;
3631}
3632#endif /* coherent mmap */
3633
3634static inline struct page *
3635snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3636{
3637 void *vaddr = substream->runtime->dma_area + ofs;
3638
3639 switch (substream->dma_buffer.dev.type) {
3640#ifdef CONFIG_SND_DMA_SGBUF
3641 case SNDRV_DMA_TYPE_DEV_SG:
3642 case SNDRV_DMA_TYPE_DEV_UC_SG:
3643 return snd_pcm_sgbuf_ops_page(substream, ofs);
3644#endif /* CONFIG_SND_DMA_SGBUF */
3645 case SNDRV_DMA_TYPE_VMALLOC:
3646 return vmalloc_to_page(vaddr);
3647 default:
3648 return virt_to_page(vaddr);
3649 }
3650}
3651
3652/*
3653 * fault callback for mmapping a RAM page
3654 */
3655static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3656{
3657 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3658 struct snd_pcm_runtime *runtime;
3659 unsigned long offset;
3660 struct page * page;
3661 size_t dma_bytes;
3662
3663 if (substream == NULL)
3664 return VM_FAULT_SIGBUS;
3665 runtime = substream->runtime;
3666 offset = vmf->pgoff << PAGE_SHIFT;
3667 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3668 if (offset > dma_bytes - PAGE_SIZE)
3669 return VM_FAULT_SIGBUS;
3670 if (substream->ops->page)
3671 page = substream->ops->page(substream, offset);
3672 else
3673 page = snd_pcm_default_page_ops(substream, offset);
3674 if (!page)
3675 return VM_FAULT_SIGBUS;
3676 get_page(page);
3677 vmf->page = page;
3678 return 0;
3679}
3680
3681static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3682 .open = snd_pcm_mmap_data_open,
3683 .close = snd_pcm_mmap_data_close,
3684};
3685
3686static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3687 .open = snd_pcm_mmap_data_open,
3688 .close = snd_pcm_mmap_data_close,
3689 .fault = snd_pcm_mmap_data_fault,
3690};
3691
3692/*
3693 * mmap the DMA buffer on RAM
3694 */
3695
3696/**
3697 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3698 * @substream: PCM substream
3699 * @area: VMA
3700 *
3701 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3702 * this function is invoked implicitly.
3703 */
3704int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3705 struct vm_area_struct *area)
3706{
3707 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3708#ifdef CONFIG_GENERIC_ALLOCATOR
3709 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3710 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3711 return remap_pfn_range(area, area->vm_start,
3712 substream->dma_buffer.addr >> PAGE_SHIFT,
3713 area->vm_end - area->vm_start, area->vm_page_prot);
3714 }
3715#endif /* CONFIG_GENERIC_ALLOCATOR */
3716 if (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page &&
3717 (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV ||
3718 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_UC))
3719 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3720 area,
3721 substream->runtime->dma_area,
3722 substream->runtime->dma_addr,
3723 substream->runtime->dma_bytes);
3724 /* mmap with fault handler */
3725 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3726 return 0;
3727}
3728EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3729
3730/*
3731 * mmap the DMA buffer on I/O memory area
3732 */
3733#if SNDRV_PCM_INFO_MMAP_IOMEM
3734/**
3735 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3736 * @substream: PCM substream
3737 * @area: VMA
3738 *
3739 * When your hardware uses the iomapped pages as the hardware buffer and
3740 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3741 * is supposed to work only on limited architectures.
3742 */
3743int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3744 struct vm_area_struct *area)
3745{
3746 struct snd_pcm_runtime *runtime = substream->runtime;
3747
3748 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3749 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3750}
3751EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3752#endif /* SNDRV_PCM_INFO_MMAP */
3753
3754/*
3755 * mmap DMA buffer
3756 */
3757int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3758 struct vm_area_struct *area)
3759{
3760 struct snd_pcm_runtime *runtime;
3761 long size;
3762 unsigned long offset;
3763 size_t dma_bytes;
3764 int err;
3765
3766 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3767 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3768 return -EINVAL;
3769 } else {
3770 if (!(area->vm_flags & VM_READ))
3771 return -EINVAL;
3772 }
3773 runtime = substream->runtime;
3774 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3775 return -EBADFD;
3776 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3777 return -ENXIO;
3778 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3779 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3780 return -EINVAL;
3781 size = area->vm_end - area->vm_start;
3782 offset = area->vm_pgoff << PAGE_SHIFT;
3783 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3784 if ((size_t)size > dma_bytes)
3785 return -EINVAL;
3786 if (offset > dma_bytes - size)
3787 return -EINVAL;
3788
3789 area->vm_ops = &snd_pcm_vm_ops_data;
3790 area->vm_private_data = substream;
3791 if (substream->ops->mmap)
3792 err = substream->ops->mmap(substream, area);
3793 else
3794 err = snd_pcm_lib_default_mmap(substream, area);
3795 if (!err)
3796 atomic_inc(&substream->mmap_count);
3797 return err;
3798}
3799EXPORT_SYMBOL(snd_pcm_mmap_data);
3800
3801static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3802{
3803 struct snd_pcm_file * pcm_file;
3804 struct snd_pcm_substream *substream;
3805 unsigned long offset;
3806
3807 pcm_file = file->private_data;
3808 substream = pcm_file->substream;
3809 if (PCM_RUNTIME_CHECK(substream))
3810 return -ENXIO;
3811
3812 offset = area->vm_pgoff << PAGE_SHIFT;
3813 switch (offset) {
3814 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3815 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3816 return -ENXIO;
3817 fallthrough;
3818 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3819 if (!pcm_status_mmap_allowed(pcm_file))
3820 return -ENXIO;
3821 return snd_pcm_mmap_status(substream, file, area);
3822 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3823 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3824 return -ENXIO;
3825 fallthrough;
3826 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3827 if (!pcm_control_mmap_allowed(pcm_file))
3828 return -ENXIO;
3829 return snd_pcm_mmap_control(substream, file, area);
3830 default:
3831 return snd_pcm_mmap_data(substream, file, area);
3832 }
3833 return 0;
3834}
3835
3836static int snd_pcm_fasync(int fd, struct file * file, int on)
3837{
3838 struct snd_pcm_file * pcm_file;
3839 struct snd_pcm_substream *substream;
3840 struct snd_pcm_runtime *runtime;
3841
3842 pcm_file = file->private_data;
3843 substream = pcm_file->substream;
3844 if (PCM_RUNTIME_CHECK(substream))
3845 return -ENXIO;
3846 runtime = substream->runtime;
3847 return fasync_helper(fd, file, on, &runtime->fasync);
3848}
3849
3850/*
3851 * ioctl32 compat
3852 */
3853#ifdef CONFIG_COMPAT
3854#include "pcm_compat.c"
3855#else
3856#define snd_pcm_ioctl_compat NULL
3857#endif
3858
3859/*
3860 * To be removed helpers to keep binary compatibility
3861 */
3862
3863#ifdef CONFIG_SND_SUPPORT_OLD_API
3864#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3865#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3866
3867static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3868 struct snd_pcm_hw_params_old *oparams)
3869{
3870 unsigned int i;
3871
3872 memset(params, 0, sizeof(*params));
3873 params->flags = oparams->flags;
3874 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3875 params->masks[i].bits[0] = oparams->masks[i];
3876 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3877 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3878 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3879 params->info = oparams->info;
3880 params->msbits = oparams->msbits;
3881 params->rate_num = oparams->rate_num;
3882 params->rate_den = oparams->rate_den;
3883 params->fifo_size = oparams->fifo_size;
3884}
3885
3886static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3887 struct snd_pcm_hw_params *params)
3888{
3889 unsigned int i;
3890
3891 memset(oparams, 0, sizeof(*oparams));
3892 oparams->flags = params->flags;
3893 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3894 oparams->masks[i] = params->masks[i].bits[0];
3895 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3896 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3897 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3898 oparams->info = params->info;
3899 oparams->msbits = params->msbits;
3900 oparams->rate_num = params->rate_num;
3901 oparams->rate_den = params->rate_den;
3902 oparams->fifo_size = params->fifo_size;
3903}
3904
3905static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3906 struct snd_pcm_hw_params_old __user * _oparams)
3907{
3908 struct snd_pcm_hw_params *params;
3909 struct snd_pcm_hw_params_old *oparams = NULL;
3910 int err;
3911
3912 params = kmalloc(sizeof(*params), GFP_KERNEL);
3913 if (!params)
3914 return -ENOMEM;
3915
3916 oparams = memdup_user(_oparams, sizeof(*oparams));
3917 if (IS_ERR(oparams)) {
3918 err = PTR_ERR(oparams);
3919 goto out;
3920 }
3921 snd_pcm_hw_convert_from_old_params(params, oparams);
3922 err = snd_pcm_hw_refine(substream, params);
3923 if (err < 0)
3924 goto out_old;
3925
3926 err = fixup_unreferenced_params(substream, params);
3927 if (err < 0)
3928 goto out_old;
3929
3930 snd_pcm_hw_convert_to_old_params(oparams, params);
3931 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3932 err = -EFAULT;
3933out_old:
3934 kfree(oparams);
3935out:
3936 kfree(params);
3937 return err;
3938}
3939
3940static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3941 struct snd_pcm_hw_params_old __user * _oparams)
3942{
3943 struct snd_pcm_hw_params *params;
3944 struct snd_pcm_hw_params_old *oparams = NULL;
3945 int err;
3946
3947 params = kmalloc(sizeof(*params), GFP_KERNEL);
3948 if (!params)
3949 return -ENOMEM;
3950
3951 oparams = memdup_user(_oparams, sizeof(*oparams));
3952 if (IS_ERR(oparams)) {
3953 err = PTR_ERR(oparams);
3954 goto out;
3955 }
3956
3957 snd_pcm_hw_convert_from_old_params(params, oparams);
3958 err = snd_pcm_hw_params(substream, params);
3959 if (err < 0)
3960 goto out_old;
3961
3962 snd_pcm_hw_convert_to_old_params(oparams, params);
3963 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
3964 err = -EFAULT;
3965out_old:
3966 kfree(oparams);
3967out:
3968 kfree(params);
3969 return err;
3970}
3971#endif /* CONFIG_SND_SUPPORT_OLD_API */
3972
3973#ifndef CONFIG_MMU
3974static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3975 unsigned long addr,
3976 unsigned long len,
3977 unsigned long pgoff,
3978 unsigned long flags)
3979{
3980 struct snd_pcm_file *pcm_file = file->private_data;
3981 struct snd_pcm_substream *substream = pcm_file->substream;
3982 struct snd_pcm_runtime *runtime = substream->runtime;
3983 unsigned long offset = pgoff << PAGE_SHIFT;
3984
3985 switch (offset) {
3986 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3987 return (unsigned long)runtime->status;
3988 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3989 return (unsigned long)runtime->control;
3990 default:
3991 return (unsigned long)runtime->dma_area + offset;
3992 }
3993}
3994#else
3995# define snd_pcm_get_unmapped_area NULL
3996#endif
3997
3998/*
3999 * Register section
4000 */
4001
4002const struct file_operations snd_pcm_f_ops[2] = {
4003 {
4004 .owner = THIS_MODULE,
4005 .write = snd_pcm_write,
4006 .write_iter = snd_pcm_writev,
4007 .open = snd_pcm_playback_open,
4008 .release = snd_pcm_release,
4009 .llseek = no_llseek,
4010 .poll = snd_pcm_poll,
4011 .unlocked_ioctl = snd_pcm_ioctl,
4012 .compat_ioctl = snd_pcm_ioctl_compat,
4013 .mmap = snd_pcm_mmap,
4014 .fasync = snd_pcm_fasync,
4015 .get_unmapped_area = snd_pcm_get_unmapped_area,
4016 },
4017 {
4018 .owner = THIS_MODULE,
4019 .read = snd_pcm_read,
4020 .read_iter = snd_pcm_readv,
4021 .open = snd_pcm_capture_open,
4022 .release = snd_pcm_release,
4023 .llseek = no_llseek,
4024 .poll = snd_pcm_poll,
4025 .unlocked_ioctl = snd_pcm_ioctl,
4026 .compat_ioctl = snd_pcm_ioctl_compat,
4027 .mmap = snd_pcm_mmap,
4028 .fasync = snd_pcm_fasync,
4029 .get_unmapped_area = snd_pcm_get_unmapped_area,
4030 }
4031};
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Digital Audio (PCM) abstract layer
4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
5 */
6
7#include <linux/compat.h>
8#include <linux/mm.h>
9#include <linux/module.h>
10#include <linux/file.h>
11#include <linux/slab.h>
12#include <linux/sched/signal.h>
13#include <linux/time.h>
14#include <linux/pm_qos.h>
15#include <linux/io.h>
16#include <linux/dma-mapping.h>
17#include <linux/vmalloc.h>
18#include <sound/core.h>
19#include <sound/control.h>
20#include <sound/info.h>
21#include <sound/pcm.h>
22#include <sound/pcm_params.h>
23#include <sound/timer.h>
24#include <sound/minors.h>
25#include <linux/uio.h>
26#include <linux/delay.h>
27
28#include "pcm_local.h"
29
30#ifdef CONFIG_SND_DEBUG
31#define CREATE_TRACE_POINTS
32#include "pcm_param_trace.h"
33#else
34#define trace_hw_mask_param_enabled() 0
35#define trace_hw_interval_param_enabled() 0
36#define trace_hw_mask_param(substream, type, index, prev, curr)
37#define trace_hw_interval_param(substream, type, index, prev, curr)
38#endif
39
40/*
41 * Compatibility
42 */
43
44struct snd_pcm_hw_params_old {
45 unsigned int flags;
46 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
47 SNDRV_PCM_HW_PARAM_ACCESS + 1];
48 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
49 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
50 unsigned int rmask;
51 unsigned int cmask;
52 unsigned int info;
53 unsigned int msbits;
54 unsigned int rate_num;
55 unsigned int rate_den;
56 snd_pcm_uframes_t fifo_size;
57 unsigned char reserved[64];
58};
59
60#ifdef CONFIG_SND_SUPPORT_OLD_API
61#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
62#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
63
64static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68#endif
69static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
70
71/*
72 *
73 */
74
75static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
77void snd_pcm_group_init(struct snd_pcm_group *group)
78{
79 spin_lock_init(&group->lock);
80 mutex_init(&group->mutex);
81 INIT_LIST_HEAD(&group->substreams);
82 refcount_set(&group->refs, 1);
83}
84
85/* define group lock helpers */
86#define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \
87static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \
88{ \
89 if (nonatomic) \
90 mutex_ ## mutex_action(&group->mutex); \
91 else \
92 spin_ ## action(&group->lock); \
93}
94
95DEFINE_PCM_GROUP_LOCK(lock, lock);
96DEFINE_PCM_GROUP_LOCK(unlock, unlock);
97DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
98DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock);
99
100/**
101 * snd_pcm_stream_lock - Lock the PCM stream
102 * @substream: PCM substream
103 *
104 * This locks the PCM stream's spinlock or mutex depending on the nonatomic
105 * flag of the given substream. This also takes the global link rw lock
106 * (or rw sem), too, for avoiding the race with linked streams.
107 */
108void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
109{
110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
111}
112EXPORT_SYMBOL_GPL(snd_pcm_stream_lock);
113
114/**
115 * snd_pcm_stream_unlock - Unlock the PCM stream
116 * @substream: PCM substream
117 *
118 * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock().
119 */
120void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
121{
122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
123}
124EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
125
126/**
127 * snd_pcm_stream_lock_irq - Lock the PCM stream
128 * @substream: PCM substream
129 *
130 * This locks the PCM stream like snd_pcm_stream_lock() and disables the local
131 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
132 * as snd_pcm_stream_lock().
133 */
134void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
135{
136 snd_pcm_group_lock_irq(&substream->self_group,
137 substream->pcm->nonatomic);
138}
139EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
140
141static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
142{
143 struct snd_pcm_group *group = &substream->self_group;
144
145 if (substream->pcm->nonatomic)
146 mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
147 else
148 spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
149}
150
151/**
152 * snd_pcm_stream_unlock_irq - Unlock the PCM stream
153 * @substream: PCM substream
154 *
155 * This is a counter-part of snd_pcm_stream_lock_irq().
156 */
157void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
158{
159 snd_pcm_group_unlock_irq(&substream->self_group,
160 substream->pcm->nonatomic);
161}
162EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
163
164unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
165{
166 unsigned long flags = 0;
167 if (substream->pcm->nonatomic)
168 mutex_lock(&substream->self_group.mutex);
169 else
170 spin_lock_irqsave(&substream->self_group.lock, flags);
171 return flags;
172}
173EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
174
175unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
176{
177 unsigned long flags = 0;
178 if (substream->pcm->nonatomic)
179 mutex_lock_nested(&substream->self_group.mutex,
180 SINGLE_DEPTH_NESTING);
181 else
182 spin_lock_irqsave_nested(&substream->self_group.lock, flags,
183 SINGLE_DEPTH_NESTING);
184 return flags;
185}
186EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
187
188/**
189 * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream
190 * @substream: PCM substream
191 * @flags: irq flags
192 *
193 * This is a counter-part of snd_pcm_stream_lock_irqsave().
194 */
195void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
196 unsigned long flags)
197{
198 if (substream->pcm->nonatomic)
199 mutex_unlock(&substream->self_group.mutex);
200 else
201 spin_unlock_irqrestore(&substream->self_group.lock, flags);
202}
203EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
204
205/* Run PCM ioctl ops */
206static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream,
207 unsigned cmd, void *arg)
208{
209 if (substream->ops->ioctl)
210 return substream->ops->ioctl(substream, cmd, arg);
211 else
212 return snd_pcm_lib_ioctl(substream, cmd, arg);
213}
214
215int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
216{
217 struct snd_pcm *pcm = substream->pcm;
218 struct snd_pcm_str *pstr = substream->pstr;
219
220 memset(info, 0, sizeof(*info));
221 info->card = pcm->card->number;
222 info->device = pcm->device;
223 info->stream = substream->stream;
224 info->subdevice = substream->number;
225 strscpy(info->id, pcm->id, sizeof(info->id));
226 strscpy(info->name, pcm->name, sizeof(info->name));
227 info->dev_class = pcm->dev_class;
228 info->dev_subclass = pcm->dev_subclass;
229 info->subdevices_count = pstr->substream_count;
230 info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
231 strscpy(info->subname, substream->name, sizeof(info->subname));
232
233 return 0;
234}
235
236int snd_pcm_info_user(struct snd_pcm_substream *substream,
237 struct snd_pcm_info __user * _info)
238{
239 struct snd_pcm_info *info;
240 int err;
241
242 info = kmalloc(sizeof(*info), GFP_KERNEL);
243 if (! info)
244 return -ENOMEM;
245 err = snd_pcm_info(substream, info);
246 if (err >= 0) {
247 if (copy_to_user(_info, info, sizeof(*info)))
248 err = -EFAULT;
249 }
250 kfree(info);
251 return err;
252}
253
254/* macro for simplified cast */
255#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
256
257static bool hw_support_mmap(struct snd_pcm_substream *substream)
258{
259 struct snd_dma_buffer *dmabuf;
260
261 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
262 return false;
263
264 if (substream->ops->mmap || substream->ops->page)
265 return true;
266
267 dmabuf = snd_pcm_get_dma_buf(substream);
268 if (!dmabuf)
269 dmabuf = &substream->dma_buffer;
270 switch (dmabuf->dev.type) {
271 case SNDRV_DMA_TYPE_UNKNOWN:
272 /* we can't know the device, so just assume that the driver does
273 * everything right
274 */
275 return true;
276 case SNDRV_DMA_TYPE_CONTINUOUS:
277 case SNDRV_DMA_TYPE_VMALLOC:
278 return true;
279 default:
280 return dma_can_mmap(dmabuf->dev.dev);
281 }
282}
283
284static int constrain_mask_params(struct snd_pcm_substream *substream,
285 struct snd_pcm_hw_params *params)
286{
287 struct snd_pcm_hw_constraints *constrs =
288 &substream->runtime->hw_constraints;
289 struct snd_mask *m;
290 unsigned int k;
291 struct snd_mask old_mask __maybe_unused;
292 int changed;
293
294 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
295 m = hw_param_mask(params, k);
296 if (snd_mask_empty(m))
297 return -EINVAL;
298
299 /* This parameter is not requested to change by a caller. */
300 if (!(params->rmask & PARAM_MASK_BIT(k)))
301 continue;
302
303 if (trace_hw_mask_param_enabled())
304 old_mask = *m;
305
306 changed = snd_mask_refine(m, constrs_mask(constrs, k));
307 if (changed < 0)
308 return changed;
309 if (changed == 0)
310 continue;
311
312 /* Set corresponding flag so that the caller gets it. */
313 trace_hw_mask_param(substream, k, 0, &old_mask, m);
314 params->cmask |= PARAM_MASK_BIT(k);
315 }
316
317 return 0;
318}
319
320static int constrain_interval_params(struct snd_pcm_substream *substream,
321 struct snd_pcm_hw_params *params)
322{
323 struct snd_pcm_hw_constraints *constrs =
324 &substream->runtime->hw_constraints;
325 struct snd_interval *i;
326 unsigned int k;
327 struct snd_interval old_interval __maybe_unused;
328 int changed;
329
330 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
331 i = hw_param_interval(params, k);
332 if (snd_interval_empty(i))
333 return -EINVAL;
334
335 /* This parameter is not requested to change by a caller. */
336 if (!(params->rmask & PARAM_MASK_BIT(k)))
337 continue;
338
339 if (trace_hw_interval_param_enabled())
340 old_interval = *i;
341
342 changed = snd_interval_refine(i, constrs_interval(constrs, k));
343 if (changed < 0)
344 return changed;
345 if (changed == 0)
346 continue;
347
348 /* Set corresponding flag so that the caller gets it. */
349 trace_hw_interval_param(substream, k, 0, &old_interval, i);
350 params->cmask |= PARAM_MASK_BIT(k);
351 }
352
353 return 0;
354}
355
356static int constrain_params_by_rules(struct snd_pcm_substream *substream,
357 struct snd_pcm_hw_params *params)
358{
359 struct snd_pcm_hw_constraints *constrs =
360 &substream->runtime->hw_constraints;
361 unsigned int k;
362 unsigned int *rstamps;
363 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
364 unsigned int stamp;
365 struct snd_pcm_hw_rule *r;
366 unsigned int d;
367 struct snd_mask old_mask __maybe_unused;
368 struct snd_interval old_interval __maybe_unused;
369 bool again;
370 int changed, err = 0;
371
372 /*
373 * Each application of rule has own sequence number.
374 *
375 * Each member of 'rstamps' array represents the sequence number of
376 * recent application of corresponding rule.
377 */
378 rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL);
379 if (!rstamps)
380 return -ENOMEM;
381
382 /*
383 * Each member of 'vstamps' array represents the sequence number of
384 * recent application of rule in which corresponding parameters were
385 * changed.
386 *
387 * In initial state, elements corresponding to parameters requested by
388 * a caller is 1. For unrequested parameters, corresponding members
389 * have 0 so that the parameters are never changed anymore.
390 */
391 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
392 vstamps[k] = (params->rmask & PARAM_MASK_BIT(k)) ? 1 : 0;
393
394 /* Due to the above design, actual sequence number starts at 2. */
395 stamp = 2;
396retry:
397 /* Apply all rules in order. */
398 again = false;
399 for (k = 0; k < constrs->rules_num; k++) {
400 r = &constrs->rules[k];
401
402 /*
403 * Check condition bits of this rule. When the rule has
404 * some condition bits, parameter without the bits is
405 * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP
406 * is an example of the condition bits.
407 */
408 if (r->cond && !(r->cond & params->flags))
409 continue;
410
411 /*
412 * The 'deps' array includes maximum four dependencies
413 * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
414 * member of this array is a sentinel and should be
415 * negative value.
416 *
417 * This rule should be processed in this time when dependent
418 * parameters were changed at former applications of the other
419 * rules.
420 */
421 for (d = 0; r->deps[d] >= 0; d++) {
422 if (vstamps[r->deps[d]] > rstamps[k])
423 break;
424 }
425 if (r->deps[d] < 0)
426 continue;
427
428 if (trace_hw_mask_param_enabled()) {
429 if (hw_is_mask(r->var))
430 old_mask = *hw_param_mask(params, r->var);
431 }
432 if (trace_hw_interval_param_enabled()) {
433 if (hw_is_interval(r->var))
434 old_interval = *hw_param_interval(params, r->var);
435 }
436
437 changed = r->func(params, r);
438 if (changed < 0) {
439 err = changed;
440 goto out;
441 }
442
443 /*
444 * When the parameter is changed, notify it to the caller
445 * by corresponding returned bit, then preparing for next
446 * iteration.
447 */
448 if (changed && r->var >= 0) {
449 if (hw_is_mask(r->var)) {
450 trace_hw_mask_param(substream, r->var,
451 k + 1, &old_mask,
452 hw_param_mask(params, r->var));
453 }
454 if (hw_is_interval(r->var)) {
455 trace_hw_interval_param(substream, r->var,
456 k + 1, &old_interval,
457 hw_param_interval(params, r->var));
458 }
459
460 params->cmask |= PARAM_MASK_BIT(r->var);
461 vstamps[r->var] = stamp;
462 again = true;
463 }
464
465 rstamps[k] = stamp++;
466 }
467
468 /* Iterate to evaluate all rules till no parameters are changed. */
469 if (again)
470 goto retry;
471
472 out:
473 kfree(rstamps);
474 return err;
475}
476
477static int fixup_unreferenced_params(struct snd_pcm_substream *substream,
478 struct snd_pcm_hw_params *params)
479{
480 const struct snd_interval *i;
481 const struct snd_mask *m;
482 int err;
483
484 if (!params->msbits) {
485 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
486 if (snd_interval_single(i))
487 params->msbits = snd_interval_value(i);
488 }
489
490 if (!params->rate_den) {
491 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
492 if (snd_interval_single(i)) {
493 params->rate_num = snd_interval_value(i);
494 params->rate_den = 1;
495 }
496 }
497
498 if (!params->fifo_size) {
499 m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT);
500 i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
501 if (snd_mask_single(m) && snd_interval_single(i)) {
502 err = snd_pcm_ops_ioctl(substream,
503 SNDRV_PCM_IOCTL1_FIFO_SIZE,
504 params);
505 if (err < 0)
506 return err;
507 }
508 }
509
510 if (!params->info) {
511 params->info = substream->runtime->hw.info;
512 params->info &= ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES |
513 SNDRV_PCM_INFO_DRAIN_TRIGGER);
514 if (!hw_support_mmap(substream))
515 params->info &= ~(SNDRV_PCM_INFO_MMAP |
516 SNDRV_PCM_INFO_MMAP_VALID);
517 }
518
519 return 0;
520}
521
522int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
523 struct snd_pcm_hw_params *params)
524{
525 int err;
526
527 params->info = 0;
528 params->fifo_size = 0;
529 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
530 params->msbits = 0;
531 if (params->rmask & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_RATE)) {
532 params->rate_num = 0;
533 params->rate_den = 0;
534 }
535
536 err = constrain_mask_params(substream, params);
537 if (err < 0)
538 return err;
539
540 err = constrain_interval_params(substream, params);
541 if (err < 0)
542 return err;
543
544 err = constrain_params_by_rules(substream, params);
545 if (err < 0)
546 return err;
547
548 params->rmask = 0;
549
550 return 0;
551}
552EXPORT_SYMBOL(snd_pcm_hw_refine);
553
554static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
555 struct snd_pcm_hw_params __user * _params)
556{
557 struct snd_pcm_hw_params *params;
558 int err;
559
560 params = memdup_user(_params, sizeof(*params));
561 if (IS_ERR(params))
562 return PTR_ERR(params);
563
564 err = snd_pcm_hw_refine(substream, params);
565 if (err < 0)
566 goto end;
567
568 err = fixup_unreferenced_params(substream, params);
569 if (err < 0)
570 goto end;
571
572 if (copy_to_user(_params, params, sizeof(*params)))
573 err = -EFAULT;
574end:
575 kfree(params);
576 return err;
577}
578
579static int period_to_usecs(struct snd_pcm_runtime *runtime)
580{
581 int usecs;
582
583 if (! runtime->rate)
584 return -1; /* invalid */
585
586 /* take 75% of period time as the deadline */
587 usecs = (750000 / runtime->rate) * runtime->period_size;
588 usecs += ((750000 % runtime->rate) * runtime->period_size) /
589 runtime->rate;
590
591 return usecs;
592}
593
594static void snd_pcm_set_state(struct snd_pcm_substream *substream,
595 snd_pcm_state_t state)
596{
597 snd_pcm_stream_lock_irq(substream);
598 if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
599 __snd_pcm_set_state(substream->runtime, state);
600 snd_pcm_stream_unlock_irq(substream);
601}
602
603static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream,
604 int event)
605{
606#ifdef CONFIG_SND_PCM_TIMER
607 if (substream->timer)
608 snd_timer_notify(substream->timer, event,
609 &substream->runtime->trigger_tstamp);
610#endif
611}
612
613void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
614{
615 if (substream->runtime && substream->runtime->stop_operating) {
616 substream->runtime->stop_operating = false;
617 if (substream->ops && substream->ops->sync_stop)
618 substream->ops->sync_stop(substream);
619 else if (sync_irq && substream->pcm->card->sync_irq > 0)
620 synchronize_irq(substream->pcm->card->sync_irq);
621 }
622}
623
624/**
625 * snd_pcm_hw_params_choose - choose a configuration defined by @params
626 * @pcm: PCM instance
627 * @params: the hw_params instance
628 *
629 * Choose one configuration from configuration space defined by @params.
630 * The configuration chosen is that obtained fixing in this order:
631 * first access, first format, first subformat, min channels,
632 * min rate, min period time, max buffer size, min tick time
633 *
634 * Return: Zero if successful, or a negative error code on failure.
635 */
636static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
637 struct snd_pcm_hw_params *params)
638{
639 static const int vars[] = {
640 SNDRV_PCM_HW_PARAM_ACCESS,
641 SNDRV_PCM_HW_PARAM_FORMAT,
642 SNDRV_PCM_HW_PARAM_SUBFORMAT,
643 SNDRV_PCM_HW_PARAM_CHANNELS,
644 SNDRV_PCM_HW_PARAM_RATE,
645 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
646 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
647 SNDRV_PCM_HW_PARAM_TICK_TIME,
648 -1
649 };
650 const int *v;
651 struct snd_mask old_mask __maybe_unused;
652 struct snd_interval old_interval __maybe_unused;
653 int changed;
654
655 for (v = vars; *v != -1; v++) {
656 /* Keep old parameter to trace. */
657 if (trace_hw_mask_param_enabled()) {
658 if (hw_is_mask(*v))
659 old_mask = *hw_param_mask(params, *v);
660 }
661 if (trace_hw_interval_param_enabled()) {
662 if (hw_is_interval(*v))
663 old_interval = *hw_param_interval(params, *v);
664 }
665 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
666 changed = snd_pcm_hw_param_first(pcm, params, *v, NULL);
667 else
668 changed = snd_pcm_hw_param_last(pcm, params, *v, NULL);
669 if (changed < 0)
670 return changed;
671 if (changed == 0)
672 continue;
673
674 /* Trace the changed parameter. */
675 if (hw_is_mask(*v)) {
676 trace_hw_mask_param(pcm, *v, 0, &old_mask,
677 hw_param_mask(params, *v));
678 }
679 if (hw_is_interval(*v)) {
680 trace_hw_interval_param(pcm, *v, 0, &old_interval,
681 hw_param_interval(params, *v));
682 }
683 }
684
685 return 0;
686}
687
688/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
689 * block the further r/w operations
690 */
691static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
692{
693 if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
694 return -EBUSY;
695 mutex_lock(&runtime->buffer_mutex);
696 return 0; /* keep buffer_mutex, unlocked by below */
697}
698
699/* release buffer_mutex and clear r/w access flag */
700static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
701{
702 mutex_unlock(&runtime->buffer_mutex);
703 atomic_inc(&runtime->buffer_accessing);
704}
705
706#if IS_ENABLED(CONFIG_SND_PCM_OSS)
707#define is_oss_stream(substream) ((substream)->oss.oss)
708#else
709#define is_oss_stream(substream) false
710#endif
711
712static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
713 struct snd_pcm_hw_params *params)
714{
715 struct snd_pcm_runtime *runtime;
716 int err, usecs;
717 unsigned int bits;
718 snd_pcm_uframes_t frames;
719
720 if (PCM_RUNTIME_CHECK(substream))
721 return -ENXIO;
722 runtime = substream->runtime;
723 err = snd_pcm_buffer_access_lock(runtime);
724 if (err < 0)
725 return err;
726 snd_pcm_stream_lock_irq(substream);
727 switch (runtime->state) {
728 case SNDRV_PCM_STATE_OPEN:
729 case SNDRV_PCM_STATE_SETUP:
730 case SNDRV_PCM_STATE_PREPARED:
731 if (!is_oss_stream(substream) &&
732 atomic_read(&substream->mmap_count))
733 err = -EBADFD;
734 break;
735 default:
736 err = -EBADFD;
737 break;
738 }
739 snd_pcm_stream_unlock_irq(substream);
740 if (err)
741 goto unlock;
742
743 snd_pcm_sync_stop(substream, true);
744
745 params->rmask = ~0U;
746 err = snd_pcm_hw_refine(substream, params);
747 if (err < 0)
748 goto _error;
749
750 err = snd_pcm_hw_params_choose(substream, params);
751 if (err < 0)
752 goto _error;
753
754 err = fixup_unreferenced_params(substream, params);
755 if (err < 0)
756 goto _error;
757
758 if (substream->managed_buffer_alloc) {
759 err = snd_pcm_lib_malloc_pages(substream,
760 params_buffer_bytes(params));
761 if (err < 0)
762 goto _error;
763 runtime->buffer_changed = err > 0;
764 }
765
766 if (substream->ops->hw_params != NULL) {
767 err = substream->ops->hw_params(substream, params);
768 if (err < 0)
769 goto _error;
770 }
771
772 runtime->access = params_access(params);
773 runtime->format = params_format(params);
774 runtime->subformat = params_subformat(params);
775 runtime->channels = params_channels(params);
776 runtime->rate = params_rate(params);
777 runtime->period_size = params_period_size(params);
778 runtime->periods = params_periods(params);
779 runtime->buffer_size = params_buffer_size(params);
780 runtime->info = params->info;
781 runtime->rate_num = params->rate_num;
782 runtime->rate_den = params->rate_den;
783 runtime->no_period_wakeup =
784 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
785 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
786
787 bits = snd_pcm_format_physical_width(runtime->format);
788 runtime->sample_bits = bits;
789 bits *= runtime->channels;
790 runtime->frame_bits = bits;
791 frames = 1;
792 while (bits % 8 != 0) {
793 bits *= 2;
794 frames *= 2;
795 }
796 runtime->byte_align = bits / 8;
797 runtime->min_align = frames;
798
799 /* Default sw params */
800 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
801 runtime->period_step = 1;
802 runtime->control->avail_min = runtime->period_size;
803 runtime->start_threshold = 1;
804 runtime->stop_threshold = runtime->buffer_size;
805 runtime->silence_threshold = 0;
806 runtime->silence_size = 0;
807 runtime->boundary = runtime->buffer_size;
808 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
809 runtime->boundary *= 2;
810
811 /* clear the buffer for avoiding possible kernel info leaks */
812 if (runtime->dma_area && !substream->ops->copy_user) {
813 size_t size = runtime->dma_bytes;
814
815 if (runtime->info & SNDRV_PCM_INFO_MMAP)
816 size = PAGE_ALIGN(size);
817 memset(runtime->dma_area, 0, size);
818 }
819
820 snd_pcm_timer_resolution_change(substream);
821 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
822
823 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
824 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
825 usecs = period_to_usecs(runtime);
826 if (usecs >= 0)
827 cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
828 usecs);
829 err = 0;
830 _error:
831 if (err) {
832 /* hardware might be unusable from this time,
833 * so we force application to retry to set
834 * the correct hardware parameter settings
835 */
836 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
837 if (substream->ops->hw_free != NULL)
838 substream->ops->hw_free(substream);
839 if (substream->managed_buffer_alloc)
840 snd_pcm_lib_free_pages(substream);
841 }
842 unlock:
843 snd_pcm_buffer_access_unlock(runtime);
844 return err;
845}
846
847static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
848 struct snd_pcm_hw_params __user * _params)
849{
850 struct snd_pcm_hw_params *params;
851 int err;
852
853 params = memdup_user(_params, sizeof(*params));
854 if (IS_ERR(params))
855 return PTR_ERR(params);
856
857 err = snd_pcm_hw_params(substream, params);
858 if (err < 0)
859 goto end;
860
861 if (copy_to_user(_params, params, sizeof(*params)))
862 err = -EFAULT;
863end:
864 kfree(params);
865 return err;
866}
867
868static int do_hw_free(struct snd_pcm_substream *substream)
869{
870 int result = 0;
871
872 snd_pcm_sync_stop(substream, true);
873 if (substream->ops->hw_free)
874 result = substream->ops->hw_free(substream);
875 if (substream->managed_buffer_alloc)
876 snd_pcm_lib_free_pages(substream);
877 return result;
878}
879
880static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
881{
882 struct snd_pcm_runtime *runtime;
883 int result = 0;
884
885 if (PCM_RUNTIME_CHECK(substream))
886 return -ENXIO;
887 runtime = substream->runtime;
888 result = snd_pcm_buffer_access_lock(runtime);
889 if (result < 0)
890 return result;
891 snd_pcm_stream_lock_irq(substream);
892 switch (runtime->state) {
893 case SNDRV_PCM_STATE_SETUP:
894 case SNDRV_PCM_STATE_PREPARED:
895 if (atomic_read(&substream->mmap_count))
896 result = -EBADFD;
897 break;
898 default:
899 result = -EBADFD;
900 break;
901 }
902 snd_pcm_stream_unlock_irq(substream);
903 if (result)
904 goto unlock;
905 result = do_hw_free(substream);
906 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
907 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
908 unlock:
909 snd_pcm_buffer_access_unlock(runtime);
910 return result;
911}
912
913static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
914 struct snd_pcm_sw_params *params)
915{
916 struct snd_pcm_runtime *runtime;
917 int err;
918
919 if (PCM_RUNTIME_CHECK(substream))
920 return -ENXIO;
921 runtime = substream->runtime;
922 snd_pcm_stream_lock_irq(substream);
923 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
924 snd_pcm_stream_unlock_irq(substream);
925 return -EBADFD;
926 }
927 snd_pcm_stream_unlock_irq(substream);
928
929 if (params->tstamp_mode < 0 ||
930 params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
931 return -EINVAL;
932 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) &&
933 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST)
934 return -EINVAL;
935 if (params->avail_min == 0)
936 return -EINVAL;
937 if (params->silence_size >= runtime->boundary) {
938 if (params->silence_threshold != 0)
939 return -EINVAL;
940 } else {
941 if (params->silence_size > params->silence_threshold)
942 return -EINVAL;
943 if (params->silence_threshold > runtime->buffer_size)
944 return -EINVAL;
945 }
946 err = 0;
947 snd_pcm_stream_lock_irq(substream);
948 runtime->tstamp_mode = params->tstamp_mode;
949 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12))
950 runtime->tstamp_type = params->tstamp_type;
951 runtime->period_step = params->period_step;
952 runtime->control->avail_min = params->avail_min;
953 runtime->start_threshold = params->start_threshold;
954 runtime->stop_threshold = params->stop_threshold;
955 runtime->silence_threshold = params->silence_threshold;
956 runtime->silence_size = params->silence_size;
957 params->boundary = runtime->boundary;
958 if (snd_pcm_running(substream)) {
959 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
960 runtime->silence_size > 0)
961 snd_pcm_playback_silence(substream, ULONG_MAX);
962 err = snd_pcm_update_state(substream, runtime);
963 }
964 snd_pcm_stream_unlock_irq(substream);
965 return err;
966}
967
968static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
969 struct snd_pcm_sw_params __user * _params)
970{
971 struct snd_pcm_sw_params params;
972 int err;
973 if (copy_from_user(¶ms, _params, sizeof(params)))
974 return -EFAULT;
975 err = snd_pcm_sw_params(substream, ¶ms);
976 if (copy_to_user(_params, ¶ms, sizeof(params)))
977 return -EFAULT;
978 return err;
979}
980
981static inline snd_pcm_uframes_t
982snd_pcm_calc_delay(struct snd_pcm_substream *substream)
983{
984 snd_pcm_uframes_t delay;
985
986 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
987 delay = snd_pcm_playback_hw_avail(substream->runtime);
988 else
989 delay = snd_pcm_capture_avail(substream->runtime);
990 return delay + substream->runtime->delay;
991}
992
993int snd_pcm_status64(struct snd_pcm_substream *substream,
994 struct snd_pcm_status64 *status)
995{
996 struct snd_pcm_runtime *runtime = substream->runtime;
997
998 snd_pcm_stream_lock_irq(substream);
999
1000 snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data,
1001 &runtime->audio_tstamp_config);
1002
1003 /* backwards compatible behavior */
1004 if (runtime->audio_tstamp_config.type_requested ==
1005 SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) {
1006 if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK)
1007 runtime->audio_tstamp_config.type_requested =
1008 SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK;
1009 else
1010 runtime->audio_tstamp_config.type_requested =
1011 SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT;
1012 runtime->audio_tstamp_report.valid = 0;
1013 } else
1014 runtime->audio_tstamp_report.valid = 1;
1015
1016 status->state = runtime->state;
1017 status->suspended_state = runtime->suspended_state;
1018 if (status->state == SNDRV_PCM_STATE_OPEN)
1019 goto _end;
1020 status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
1021 status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
1022 if (snd_pcm_running(substream)) {
1023 snd_pcm_update_hw_ptr(substream);
1024 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1025 status->tstamp_sec = runtime->status->tstamp.tv_sec;
1026 status->tstamp_nsec =
1027 runtime->status->tstamp.tv_nsec;
1028 status->driver_tstamp_sec =
1029 runtime->driver_tstamp.tv_sec;
1030 status->driver_tstamp_nsec =
1031 runtime->driver_tstamp.tv_nsec;
1032 status->audio_tstamp_sec =
1033 runtime->status->audio_tstamp.tv_sec;
1034 status->audio_tstamp_nsec =
1035 runtime->status->audio_tstamp.tv_nsec;
1036 if (runtime->audio_tstamp_report.valid == 1)
1037 /* backwards compatibility, no report provided in COMPAT mode */
1038 snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data,
1039 &status->audio_tstamp_accuracy,
1040 &runtime->audio_tstamp_report);
1041
1042 goto _tstamp_end;
1043 }
1044 } else {
1045 /* get tstamp only in fallback mode and only if enabled */
1046 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
1047 struct timespec64 tstamp;
1048
1049 snd_pcm_gettime(runtime, &tstamp);
1050 status->tstamp_sec = tstamp.tv_sec;
1051 status->tstamp_nsec = tstamp.tv_nsec;
1052 }
1053 }
1054 _tstamp_end:
1055 status->appl_ptr = runtime->control->appl_ptr;
1056 status->hw_ptr = runtime->status->hw_ptr;
1057 status->avail = snd_pcm_avail(substream);
1058 status->delay = snd_pcm_running(substream) ?
1059 snd_pcm_calc_delay(substream) : 0;
1060 status->avail_max = runtime->avail_max;
1061 status->overrange = runtime->overrange;
1062 runtime->avail_max = 0;
1063 runtime->overrange = 0;
1064 _end:
1065 snd_pcm_stream_unlock_irq(substream);
1066 return 0;
1067}
1068
1069static int snd_pcm_status_user64(struct snd_pcm_substream *substream,
1070 struct snd_pcm_status64 __user * _status,
1071 bool ext)
1072{
1073 struct snd_pcm_status64 status;
1074 int res;
1075
1076 memset(&status, 0, sizeof(status));
1077 /*
1078 * with extension, parameters are read/write,
1079 * get audio_tstamp_data from user,
1080 * ignore rest of status structure
1081 */
1082 if (ext && get_user(status.audio_tstamp_data,
1083 (u32 __user *)(&_status->audio_tstamp_data)))
1084 return -EFAULT;
1085 res = snd_pcm_status64(substream, &status);
1086 if (res < 0)
1087 return res;
1088 if (copy_to_user(_status, &status, sizeof(status)))
1089 return -EFAULT;
1090 return 0;
1091}
1092
1093static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
1094 struct snd_pcm_status32 __user * _status,
1095 bool ext)
1096{
1097 struct snd_pcm_status64 status64;
1098 struct snd_pcm_status32 status32;
1099 int res;
1100
1101 memset(&status64, 0, sizeof(status64));
1102 memset(&status32, 0, sizeof(status32));
1103 /*
1104 * with extension, parameters are read/write,
1105 * get audio_tstamp_data from user,
1106 * ignore rest of status structure
1107 */
1108 if (ext && get_user(status64.audio_tstamp_data,
1109 (u32 __user *)(&_status->audio_tstamp_data)))
1110 return -EFAULT;
1111 res = snd_pcm_status64(substream, &status64);
1112 if (res < 0)
1113 return res;
1114
1115 status32 = (struct snd_pcm_status32) {
1116 .state = status64.state,
1117 .trigger_tstamp_sec = status64.trigger_tstamp_sec,
1118 .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
1119 .tstamp_sec = status64.tstamp_sec,
1120 .tstamp_nsec = status64.tstamp_nsec,
1121 .appl_ptr = status64.appl_ptr,
1122 .hw_ptr = status64.hw_ptr,
1123 .delay = status64.delay,
1124 .avail = status64.avail,
1125 .avail_max = status64.avail_max,
1126 .overrange = status64.overrange,
1127 .suspended_state = status64.suspended_state,
1128 .audio_tstamp_data = status64.audio_tstamp_data,
1129 .audio_tstamp_sec = status64.audio_tstamp_sec,
1130 .audio_tstamp_nsec = status64.audio_tstamp_nsec,
1131 .driver_tstamp_sec = status64.audio_tstamp_sec,
1132 .driver_tstamp_nsec = status64.audio_tstamp_nsec,
1133 .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
1134 };
1135
1136 if (copy_to_user(_status, &status32, sizeof(status32)))
1137 return -EFAULT;
1138
1139 return 0;
1140}
1141
1142static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
1143 struct snd_pcm_channel_info * info)
1144{
1145 struct snd_pcm_runtime *runtime;
1146 unsigned int channel;
1147
1148 channel = info->channel;
1149 runtime = substream->runtime;
1150 snd_pcm_stream_lock_irq(substream);
1151 if (runtime->state == SNDRV_PCM_STATE_OPEN) {
1152 snd_pcm_stream_unlock_irq(substream);
1153 return -EBADFD;
1154 }
1155 snd_pcm_stream_unlock_irq(substream);
1156 if (channel >= runtime->channels)
1157 return -EINVAL;
1158 memset(info, 0, sizeof(*info));
1159 info->channel = channel;
1160 return snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
1161}
1162
1163static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
1164 struct snd_pcm_channel_info __user * _info)
1165{
1166 struct snd_pcm_channel_info info;
1167 int res;
1168
1169 if (copy_from_user(&info, _info, sizeof(info)))
1170 return -EFAULT;
1171 res = snd_pcm_channel_info(substream, &info);
1172 if (res < 0)
1173 return res;
1174 if (copy_to_user(_info, &info, sizeof(info)))
1175 return -EFAULT;
1176 return 0;
1177}
1178
1179static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
1180{
1181 struct snd_pcm_runtime *runtime = substream->runtime;
1182 if (runtime->trigger_master == NULL)
1183 return;
1184 if (runtime->trigger_master == substream) {
1185 if (!runtime->trigger_tstamp_latched)
1186 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
1187 } else {
1188 snd_pcm_trigger_tstamp(runtime->trigger_master);
1189 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
1190 }
1191 runtime->trigger_master = NULL;
1192}
1193
1194#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
1195
1196struct action_ops {
1197 int (*pre_action)(struct snd_pcm_substream *substream,
1198 snd_pcm_state_t state);
1199 int (*do_action)(struct snd_pcm_substream *substream,
1200 snd_pcm_state_t state);
1201 void (*undo_action)(struct snd_pcm_substream *substream,
1202 snd_pcm_state_t state);
1203 void (*post_action)(struct snd_pcm_substream *substream,
1204 snd_pcm_state_t state);
1205};
1206
1207/*
1208 * this functions is core for handling of linked stream
1209 * Note: the stream state might be changed also on failure
1210 * Note2: call with calling stream lock + link lock
1211 */
1212static int snd_pcm_action_group(const struct action_ops *ops,
1213 struct snd_pcm_substream *substream,
1214 snd_pcm_state_t state,
1215 bool stream_lock)
1216{
1217 struct snd_pcm_substream *s = NULL;
1218 struct snd_pcm_substream *s1;
1219 int res = 0, depth = 1;
1220
1221 snd_pcm_group_for_each_entry(s, substream) {
1222 if (s != substream) {
1223 if (!stream_lock)
1224 mutex_lock_nested(&s->runtime->buffer_mutex, depth);
1225 else if (s->pcm->nonatomic)
1226 mutex_lock_nested(&s->self_group.mutex, depth);
1227 else
1228 spin_lock_nested(&s->self_group.lock, depth);
1229 depth++;
1230 }
1231 res = ops->pre_action(s, state);
1232 if (res < 0)
1233 goto _unlock;
1234 }
1235 snd_pcm_group_for_each_entry(s, substream) {
1236 res = ops->do_action(s, state);
1237 if (res < 0) {
1238 if (ops->undo_action) {
1239 snd_pcm_group_for_each_entry(s1, substream) {
1240 if (s1 == s) /* failed stream */
1241 break;
1242 ops->undo_action(s1, state);
1243 }
1244 }
1245 s = NULL; /* unlock all */
1246 goto _unlock;
1247 }
1248 }
1249 snd_pcm_group_for_each_entry(s, substream) {
1250 ops->post_action(s, state);
1251 }
1252 _unlock:
1253 /* unlock streams */
1254 snd_pcm_group_for_each_entry(s1, substream) {
1255 if (s1 != substream) {
1256 if (!stream_lock)
1257 mutex_unlock(&s1->runtime->buffer_mutex);
1258 else if (s1->pcm->nonatomic)
1259 mutex_unlock(&s1->self_group.mutex);
1260 else
1261 spin_unlock(&s1->self_group.lock);
1262 }
1263 if (s1 == s) /* end */
1264 break;
1265 }
1266 return res;
1267}
1268
1269/*
1270 * Note: call with stream lock
1271 */
1272static int snd_pcm_action_single(const struct action_ops *ops,
1273 struct snd_pcm_substream *substream,
1274 snd_pcm_state_t state)
1275{
1276 int res;
1277
1278 res = ops->pre_action(substream, state);
1279 if (res < 0)
1280 return res;
1281 res = ops->do_action(substream, state);
1282 if (res == 0)
1283 ops->post_action(substream, state);
1284 else if (ops->undo_action)
1285 ops->undo_action(substream, state);
1286 return res;
1287}
1288
1289static void snd_pcm_group_assign(struct snd_pcm_substream *substream,
1290 struct snd_pcm_group *new_group)
1291{
1292 substream->group = new_group;
1293 list_move(&substream->link_list, &new_group->substreams);
1294}
1295
1296/*
1297 * Unref and unlock the group, but keep the stream lock;
1298 * when the group becomes empty and no longer referred, destroy itself
1299 */
1300static void snd_pcm_group_unref(struct snd_pcm_group *group,
1301 struct snd_pcm_substream *substream)
1302{
1303 bool do_free;
1304
1305 if (!group)
1306 return;
1307 do_free = refcount_dec_and_test(&group->refs);
1308 snd_pcm_group_unlock(group, substream->pcm->nonatomic);
1309 if (do_free)
1310 kfree(group);
1311}
1312
1313/*
1314 * Lock the group inside a stream lock and reference it;
1315 * return the locked group object, or NULL if not linked
1316 */
1317static struct snd_pcm_group *
1318snd_pcm_stream_group_ref(struct snd_pcm_substream *substream)
1319{
1320 bool nonatomic = substream->pcm->nonatomic;
1321 struct snd_pcm_group *group;
1322 bool trylock;
1323
1324 for (;;) {
1325 if (!snd_pcm_stream_linked(substream))
1326 return NULL;
1327 group = substream->group;
1328 /* block freeing the group object */
1329 refcount_inc(&group->refs);
1330
1331 trylock = nonatomic ? mutex_trylock(&group->mutex) :
1332 spin_trylock(&group->lock);
1333 if (trylock)
1334 break; /* OK */
1335
1336 /* re-lock for avoiding ABBA deadlock */
1337 snd_pcm_stream_unlock(substream);
1338 snd_pcm_group_lock(group, nonatomic);
1339 snd_pcm_stream_lock(substream);
1340
1341 /* check the group again; the above opens a small race window */
1342 if (substream->group == group)
1343 break; /* OK */
1344 /* group changed, try again */
1345 snd_pcm_group_unref(group, substream);
1346 }
1347 return group;
1348}
1349
1350/*
1351 * Note: call with stream lock
1352 */
1353static int snd_pcm_action(const struct action_ops *ops,
1354 struct snd_pcm_substream *substream,
1355 snd_pcm_state_t state)
1356{
1357 struct snd_pcm_group *group;
1358 int res;
1359
1360 group = snd_pcm_stream_group_ref(substream);
1361 if (group)
1362 res = snd_pcm_action_group(ops, substream, state, true);
1363 else
1364 res = snd_pcm_action_single(ops, substream, state);
1365 snd_pcm_group_unref(group, substream);
1366 return res;
1367}
1368
1369/*
1370 * Note: don't use any locks before
1371 */
1372static int snd_pcm_action_lock_irq(const struct action_ops *ops,
1373 struct snd_pcm_substream *substream,
1374 snd_pcm_state_t state)
1375{
1376 int res;
1377
1378 snd_pcm_stream_lock_irq(substream);
1379 res = snd_pcm_action(ops, substream, state);
1380 snd_pcm_stream_unlock_irq(substream);
1381 return res;
1382}
1383
1384/*
1385 */
1386static int snd_pcm_action_nonatomic(const struct action_ops *ops,
1387 struct snd_pcm_substream *substream,
1388 snd_pcm_state_t state)
1389{
1390 int res;
1391
1392 /* Guarantee the group members won't change during non-atomic action */
1393 down_read(&snd_pcm_link_rwsem);
1394 res = snd_pcm_buffer_access_lock(substream->runtime);
1395 if (res < 0)
1396 goto unlock;
1397 if (snd_pcm_stream_linked(substream))
1398 res = snd_pcm_action_group(ops, substream, state, false);
1399 else
1400 res = snd_pcm_action_single(ops, substream, state);
1401 snd_pcm_buffer_access_unlock(substream->runtime);
1402 unlock:
1403 up_read(&snd_pcm_link_rwsem);
1404 return res;
1405}
1406
1407/*
1408 * start callbacks
1409 */
1410static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
1411 snd_pcm_state_t state)
1412{
1413 struct snd_pcm_runtime *runtime = substream->runtime;
1414 if (runtime->state != SNDRV_PCM_STATE_PREPARED)
1415 return -EBADFD;
1416 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1417 !snd_pcm_playback_data(substream))
1418 return -EPIPE;
1419 runtime->trigger_tstamp_latched = false;
1420 runtime->trigger_master = substream;
1421 return 0;
1422}
1423
1424static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1425 snd_pcm_state_t state)
1426{
1427 int err;
1428
1429 if (substream->runtime->trigger_master != substream)
1430 return 0;
1431 err = substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1432 /* XRUN happened during the start */
1433 if (err == -EPIPE)
1434 __snd_pcm_set_state(substream->runtime, SNDRV_PCM_STATE_XRUN);
1435 return err;
1436}
1437
1438static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1439 snd_pcm_state_t state)
1440{
1441 if (substream->runtime->trigger_master == substream) {
1442 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1443 substream->runtime->stop_operating = true;
1444 }
1445}
1446
1447static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1448 snd_pcm_state_t state)
1449{
1450 struct snd_pcm_runtime *runtime = substream->runtime;
1451 snd_pcm_trigger_tstamp(substream);
1452 runtime->hw_ptr_jiffies = jiffies;
1453 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1454 runtime->rate;
1455 __snd_pcm_set_state(runtime, state);
1456 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1457 runtime->silence_size > 0)
1458 snd_pcm_playback_silence(substream, ULONG_MAX);
1459 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1460}
1461
1462static const struct action_ops snd_pcm_action_start = {
1463 .pre_action = snd_pcm_pre_start,
1464 .do_action = snd_pcm_do_start,
1465 .undo_action = snd_pcm_undo_start,
1466 .post_action = snd_pcm_post_start
1467};
1468
1469/**
1470 * snd_pcm_start - start all linked streams
1471 * @substream: the PCM substream instance
1472 *
1473 * Return: Zero if successful, or a negative error code.
1474 * The stream lock must be acquired before calling this function.
1475 */
1476int snd_pcm_start(struct snd_pcm_substream *substream)
1477{
1478 return snd_pcm_action(&snd_pcm_action_start, substream,
1479 SNDRV_PCM_STATE_RUNNING);
1480}
1481
1482/* take the stream lock and start the streams */
1483static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1484{
1485 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1486 SNDRV_PCM_STATE_RUNNING);
1487}
1488
1489/*
1490 * stop callbacks
1491 */
1492static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1493 snd_pcm_state_t state)
1494{
1495 struct snd_pcm_runtime *runtime = substream->runtime;
1496 if (runtime->state == SNDRV_PCM_STATE_OPEN)
1497 return -EBADFD;
1498 runtime->trigger_master = substream;
1499 return 0;
1500}
1501
1502static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1503 snd_pcm_state_t state)
1504{
1505 if (substream->runtime->trigger_master == substream &&
1506 snd_pcm_running(substream)) {
1507 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1508 substream->runtime->stop_operating = true;
1509 }
1510 return 0; /* unconditionally stop all substreams */
1511}
1512
1513static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1514 snd_pcm_state_t state)
1515{
1516 struct snd_pcm_runtime *runtime = substream->runtime;
1517 if (runtime->state != state) {
1518 snd_pcm_trigger_tstamp(substream);
1519 __snd_pcm_set_state(runtime, state);
1520 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1521 }
1522 wake_up(&runtime->sleep);
1523 wake_up(&runtime->tsleep);
1524}
1525
1526static const struct action_ops snd_pcm_action_stop = {
1527 .pre_action = snd_pcm_pre_stop,
1528 .do_action = snd_pcm_do_stop,
1529 .post_action = snd_pcm_post_stop
1530};
1531
1532/**
1533 * snd_pcm_stop - try to stop all running streams in the substream group
1534 * @substream: the PCM substream instance
1535 * @state: PCM state after stopping the stream
1536 *
1537 * The state of each stream is then changed to the given state unconditionally.
1538 *
1539 * Return: Zero if successful, or a negative error code.
1540 */
1541int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1542{
1543 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1544}
1545EXPORT_SYMBOL(snd_pcm_stop);
1546
1547/**
1548 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1549 * @substream: the PCM substream
1550 *
1551 * After stopping, the state is changed to SETUP.
1552 * Unlike snd_pcm_stop(), this affects only the given stream.
1553 *
1554 * Return: Zero if successful, or a negative error code.
1555 */
1556int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1557{
1558 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1559 SNDRV_PCM_STATE_SETUP);
1560}
1561
1562/**
1563 * snd_pcm_stop_xrun - stop the running streams as XRUN
1564 * @substream: the PCM substream instance
1565 *
1566 * This stops the given running substream (and all linked substreams) as XRUN.
1567 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1568 *
1569 * Return: Zero if successful, or a negative error code.
1570 */
1571int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1572{
1573 unsigned long flags;
1574
1575 snd_pcm_stream_lock_irqsave(substream, flags);
1576 if (substream->runtime && snd_pcm_running(substream))
1577 __snd_pcm_xrun(substream);
1578 snd_pcm_stream_unlock_irqrestore(substream, flags);
1579 return 0;
1580}
1581EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1582
1583/*
1584 * pause callbacks: pass boolean (to start pause or resume) as state argument
1585 */
1586#define pause_pushed(state) (__force bool)(state)
1587
1588static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1589 snd_pcm_state_t state)
1590{
1591 struct snd_pcm_runtime *runtime = substream->runtime;
1592 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1593 return -ENOSYS;
1594 if (pause_pushed(state)) {
1595 if (runtime->state != SNDRV_PCM_STATE_RUNNING)
1596 return -EBADFD;
1597 } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
1598 return -EBADFD;
1599 runtime->trigger_master = substream;
1600 return 0;
1601}
1602
1603static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1604 snd_pcm_state_t state)
1605{
1606 if (substream->runtime->trigger_master != substream)
1607 return 0;
1608 /* some drivers might use hw_ptr to recover from the pause -
1609 update the hw_ptr now */
1610 if (pause_pushed(state))
1611 snd_pcm_update_hw_ptr(substream);
1612 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1613 * a delta between the current jiffies, this gives a large enough
1614 * delta, effectively to skip the check once.
1615 */
1616 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1617 return substream->ops->trigger(substream,
1618 pause_pushed(state) ?
1619 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1620 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1621}
1622
1623static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1624 snd_pcm_state_t state)
1625{
1626 if (substream->runtime->trigger_master == substream)
1627 substream->ops->trigger(substream,
1628 pause_pushed(state) ?
1629 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1630 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1631}
1632
1633static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1634 snd_pcm_state_t state)
1635{
1636 struct snd_pcm_runtime *runtime = substream->runtime;
1637 snd_pcm_trigger_tstamp(substream);
1638 if (pause_pushed(state)) {
1639 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
1640 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1641 wake_up(&runtime->sleep);
1642 wake_up(&runtime->tsleep);
1643 } else {
1644 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_RUNNING);
1645 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1646 }
1647}
1648
1649static const struct action_ops snd_pcm_action_pause = {
1650 .pre_action = snd_pcm_pre_pause,
1651 .do_action = snd_pcm_do_pause,
1652 .undo_action = snd_pcm_undo_pause,
1653 .post_action = snd_pcm_post_pause
1654};
1655
1656/*
1657 * Push/release the pause for all linked streams.
1658 */
1659static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1660{
1661 return snd_pcm_action(&snd_pcm_action_pause, substream,
1662 (__force snd_pcm_state_t)push);
1663}
1664
1665static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1666 bool push)
1667{
1668 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1669 (__force snd_pcm_state_t)push);
1670}
1671
1672#ifdef CONFIG_PM
1673/* suspend callback: state argument ignored */
1674
1675static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1676 snd_pcm_state_t state)
1677{
1678 struct snd_pcm_runtime *runtime = substream->runtime;
1679 switch (runtime->state) {
1680 case SNDRV_PCM_STATE_SUSPENDED:
1681 return -EBUSY;
1682 /* unresumable PCM state; return -EBUSY for skipping suspend */
1683 case SNDRV_PCM_STATE_OPEN:
1684 case SNDRV_PCM_STATE_SETUP:
1685 case SNDRV_PCM_STATE_DISCONNECTED:
1686 return -EBUSY;
1687 }
1688 runtime->trigger_master = substream;
1689 return 0;
1690}
1691
1692static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1693 snd_pcm_state_t state)
1694{
1695 struct snd_pcm_runtime *runtime = substream->runtime;
1696 if (runtime->trigger_master != substream)
1697 return 0;
1698 if (! snd_pcm_running(substream))
1699 return 0;
1700 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1701 runtime->stop_operating = true;
1702 return 0; /* suspend unconditionally */
1703}
1704
1705static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1706 snd_pcm_state_t state)
1707{
1708 struct snd_pcm_runtime *runtime = substream->runtime;
1709 snd_pcm_trigger_tstamp(substream);
1710 runtime->suspended_state = runtime->state;
1711 runtime->status->suspended_state = runtime->suspended_state;
1712 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SUSPENDED);
1713 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1714 wake_up(&runtime->sleep);
1715 wake_up(&runtime->tsleep);
1716}
1717
1718static const struct action_ops snd_pcm_action_suspend = {
1719 .pre_action = snd_pcm_pre_suspend,
1720 .do_action = snd_pcm_do_suspend,
1721 .post_action = snd_pcm_post_suspend
1722};
1723
1724/*
1725 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1726 * @substream: the PCM substream
1727 *
1728 * After this call, all streams are changed to SUSPENDED state.
1729 *
1730 * Return: Zero if successful, or a negative error code.
1731 */
1732static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1733{
1734 int err;
1735 unsigned long flags;
1736
1737 snd_pcm_stream_lock_irqsave(substream, flags);
1738 err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1739 ACTION_ARG_IGNORE);
1740 snd_pcm_stream_unlock_irqrestore(substream, flags);
1741 return err;
1742}
1743
1744/**
1745 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1746 * @pcm: the PCM instance
1747 *
1748 * After this call, all streams are changed to SUSPENDED state.
1749 *
1750 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1751 */
1752int snd_pcm_suspend_all(struct snd_pcm *pcm)
1753{
1754 struct snd_pcm_substream *substream;
1755 int stream, err = 0;
1756
1757 if (! pcm)
1758 return 0;
1759
1760 for_each_pcm_substream(pcm, stream, substream) {
1761 /* FIXME: the open/close code should lock this as well */
1762 if (!substream->runtime)
1763 continue;
1764
1765 /*
1766 * Skip BE dai link PCM's that are internal and may
1767 * not have their substream ops set.
1768 */
1769 if (!substream->ops)
1770 continue;
1771
1772 err = snd_pcm_suspend(substream);
1773 if (err < 0 && err != -EBUSY)
1774 return err;
1775 }
1776
1777 for_each_pcm_substream(pcm, stream, substream)
1778 snd_pcm_sync_stop(substream, false);
1779
1780 return 0;
1781}
1782EXPORT_SYMBOL(snd_pcm_suspend_all);
1783
1784/* resume callbacks: state argument ignored */
1785
1786static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1787 snd_pcm_state_t state)
1788{
1789 struct snd_pcm_runtime *runtime = substream->runtime;
1790 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1791 return -ENOSYS;
1792 runtime->trigger_master = substream;
1793 return 0;
1794}
1795
1796static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1797 snd_pcm_state_t state)
1798{
1799 struct snd_pcm_runtime *runtime = substream->runtime;
1800 if (runtime->trigger_master != substream)
1801 return 0;
1802 /* DMA not running previously? */
1803 if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1804 (runtime->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1805 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1806 return 0;
1807 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1808}
1809
1810static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1811 snd_pcm_state_t state)
1812{
1813 if (substream->runtime->trigger_master == substream &&
1814 snd_pcm_running(substream))
1815 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1816}
1817
1818static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1819 snd_pcm_state_t state)
1820{
1821 struct snd_pcm_runtime *runtime = substream->runtime;
1822 snd_pcm_trigger_tstamp(substream);
1823 __snd_pcm_set_state(runtime, runtime->suspended_state);
1824 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1825}
1826
1827static const struct action_ops snd_pcm_action_resume = {
1828 .pre_action = snd_pcm_pre_resume,
1829 .do_action = snd_pcm_do_resume,
1830 .undo_action = snd_pcm_undo_resume,
1831 .post_action = snd_pcm_post_resume
1832};
1833
1834static int snd_pcm_resume(struct snd_pcm_substream *substream)
1835{
1836 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1837 ACTION_ARG_IGNORE);
1838}
1839
1840#else
1841
1842static int snd_pcm_resume(struct snd_pcm_substream *substream)
1843{
1844 return -ENOSYS;
1845}
1846
1847#endif /* CONFIG_PM */
1848
1849/*
1850 * xrun ioctl
1851 *
1852 * Change the RUNNING stream(s) to XRUN state.
1853 */
1854static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1855{
1856 struct snd_pcm_runtime *runtime = substream->runtime;
1857 int result;
1858
1859 snd_pcm_stream_lock_irq(substream);
1860 switch (runtime->state) {
1861 case SNDRV_PCM_STATE_XRUN:
1862 result = 0; /* already there */
1863 break;
1864 case SNDRV_PCM_STATE_RUNNING:
1865 __snd_pcm_xrun(substream);
1866 result = 0;
1867 break;
1868 default:
1869 result = -EBADFD;
1870 }
1871 snd_pcm_stream_unlock_irq(substream);
1872 return result;
1873}
1874
1875/*
1876 * reset ioctl
1877 */
1878/* reset callbacks: state argument ignored */
1879static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1880 snd_pcm_state_t state)
1881{
1882 struct snd_pcm_runtime *runtime = substream->runtime;
1883 switch (runtime->state) {
1884 case SNDRV_PCM_STATE_RUNNING:
1885 case SNDRV_PCM_STATE_PREPARED:
1886 case SNDRV_PCM_STATE_PAUSED:
1887 case SNDRV_PCM_STATE_SUSPENDED:
1888 return 0;
1889 default:
1890 return -EBADFD;
1891 }
1892}
1893
1894static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1895 snd_pcm_state_t state)
1896{
1897 struct snd_pcm_runtime *runtime = substream->runtime;
1898 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1899 if (err < 0)
1900 return err;
1901 snd_pcm_stream_lock_irq(substream);
1902 runtime->hw_ptr_base = 0;
1903 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1904 runtime->status->hw_ptr % runtime->period_size;
1905 runtime->silence_start = runtime->status->hw_ptr;
1906 runtime->silence_filled = 0;
1907 snd_pcm_stream_unlock_irq(substream);
1908 return 0;
1909}
1910
1911static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1912 snd_pcm_state_t state)
1913{
1914 struct snd_pcm_runtime *runtime = substream->runtime;
1915 snd_pcm_stream_lock_irq(substream);
1916 runtime->control->appl_ptr = runtime->status->hw_ptr;
1917 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1918 runtime->silence_size > 0)
1919 snd_pcm_playback_silence(substream, ULONG_MAX);
1920 snd_pcm_stream_unlock_irq(substream);
1921}
1922
1923static const struct action_ops snd_pcm_action_reset = {
1924 .pre_action = snd_pcm_pre_reset,
1925 .do_action = snd_pcm_do_reset,
1926 .post_action = snd_pcm_post_reset
1927};
1928
1929static int snd_pcm_reset(struct snd_pcm_substream *substream)
1930{
1931 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1932 ACTION_ARG_IGNORE);
1933}
1934
1935/*
1936 * prepare ioctl
1937 */
1938/* pass f_flags as state argument */
1939static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1940 snd_pcm_state_t state)
1941{
1942 struct snd_pcm_runtime *runtime = substream->runtime;
1943 int f_flags = (__force int)state;
1944
1945 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
1946 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
1947 return -EBADFD;
1948 if (snd_pcm_running(substream))
1949 return -EBUSY;
1950 substream->f_flags = f_flags;
1951 return 0;
1952}
1953
1954static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1955 snd_pcm_state_t state)
1956{
1957 int err;
1958 snd_pcm_sync_stop(substream, true);
1959 err = substream->ops->prepare(substream);
1960 if (err < 0)
1961 return err;
1962 return snd_pcm_do_reset(substream, state);
1963}
1964
1965static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1966 snd_pcm_state_t state)
1967{
1968 struct snd_pcm_runtime *runtime = substream->runtime;
1969 runtime->control->appl_ptr = runtime->status->hw_ptr;
1970 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1971}
1972
1973static const struct action_ops snd_pcm_action_prepare = {
1974 .pre_action = snd_pcm_pre_prepare,
1975 .do_action = snd_pcm_do_prepare,
1976 .post_action = snd_pcm_post_prepare
1977};
1978
1979/**
1980 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1981 * @substream: the PCM substream instance
1982 * @file: file to refer f_flags
1983 *
1984 * Return: Zero if successful, or a negative error code.
1985 */
1986static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1987 struct file *file)
1988{
1989 int f_flags;
1990
1991 if (file)
1992 f_flags = file->f_flags;
1993 else
1994 f_flags = substream->f_flags;
1995
1996 snd_pcm_stream_lock_irq(substream);
1997 switch (substream->runtime->state) {
1998 case SNDRV_PCM_STATE_PAUSED:
1999 snd_pcm_pause(substream, false);
2000 fallthrough;
2001 case SNDRV_PCM_STATE_SUSPENDED:
2002 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2003 break;
2004 }
2005 snd_pcm_stream_unlock_irq(substream);
2006
2007 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
2008 substream,
2009 (__force snd_pcm_state_t)f_flags);
2010}
2011
2012/*
2013 * drain ioctl
2014 */
2015
2016/* drain init callbacks: state argument ignored */
2017static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2018 snd_pcm_state_t state)
2019{
2020 struct snd_pcm_runtime *runtime = substream->runtime;
2021 switch (runtime->state) {
2022 case SNDRV_PCM_STATE_OPEN:
2023 case SNDRV_PCM_STATE_DISCONNECTED:
2024 case SNDRV_PCM_STATE_SUSPENDED:
2025 return -EBADFD;
2026 }
2027 runtime->trigger_master = substream;
2028 return 0;
2029}
2030
2031static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2032 snd_pcm_state_t state)
2033{
2034 struct snd_pcm_runtime *runtime = substream->runtime;
2035 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2036 switch (runtime->state) {
2037 case SNDRV_PCM_STATE_PREPARED:
2038 /* start playback stream if possible */
2039 if (! snd_pcm_playback_empty(substream)) {
2040 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2041 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2042 } else {
2043 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2044 }
2045 break;
2046 case SNDRV_PCM_STATE_RUNNING:
2047 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
2048 break;
2049 case SNDRV_PCM_STATE_XRUN:
2050 __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
2051 break;
2052 default:
2053 break;
2054 }
2055 } else {
2056 /* stop running stream */
2057 if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
2058 snd_pcm_state_t new_state;
2059
2060 new_state = snd_pcm_capture_avail(runtime) > 0 ?
2061 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2062 snd_pcm_do_stop(substream, new_state);
2063 snd_pcm_post_stop(substream, new_state);
2064 }
2065 }
2066
2067 if (runtime->state == SNDRV_PCM_STATE_DRAINING &&
2068 runtime->trigger_master == substream &&
2069 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2070 return substream->ops->trigger(substream,
2071 SNDRV_PCM_TRIGGER_DRAIN);
2072
2073 return 0;
2074}
2075
2076static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2077 snd_pcm_state_t state)
2078{
2079}
2080
2081static const struct action_ops snd_pcm_action_drain_init = {
2082 .pre_action = snd_pcm_pre_drain_init,
2083 .do_action = snd_pcm_do_drain_init,
2084 .post_action = snd_pcm_post_drain_init
2085};
2086
2087/*
2088 * Drain the stream(s).
2089 * When the substream is linked, sync until the draining of all playback streams
2090 * is finished.
2091 * After this call, all streams are supposed to be either SETUP or DRAINING
2092 * (capture only) state.
2093 */
2094static int snd_pcm_drain(struct snd_pcm_substream *substream,
2095 struct file *file)
2096{
2097 struct snd_card *card;
2098 struct snd_pcm_runtime *runtime;
2099 struct snd_pcm_substream *s;
2100 struct snd_pcm_group *group;
2101 wait_queue_entry_t wait;
2102 int result = 0;
2103 int nonblock = 0;
2104
2105 card = substream->pcm->card;
2106 runtime = substream->runtime;
2107
2108 if (runtime->state == SNDRV_PCM_STATE_OPEN)
2109 return -EBADFD;
2110
2111 if (file) {
2112 if (file->f_flags & O_NONBLOCK)
2113 nonblock = 1;
2114 } else if (substream->f_flags & O_NONBLOCK)
2115 nonblock = 1;
2116
2117 snd_pcm_stream_lock_irq(substream);
2118 /* resume pause */
2119 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2120 snd_pcm_pause(substream, false);
2121
2122 /* pre-start/stop - all running streams are changed to DRAINING state */
2123 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2124 ACTION_ARG_IGNORE);
2125 if (result < 0)
2126 goto unlock;
2127 /* in non-blocking, we don't wait in ioctl but let caller poll */
2128 if (nonblock) {
2129 result = -EAGAIN;
2130 goto unlock;
2131 }
2132
2133 for (;;) {
2134 long tout;
2135 struct snd_pcm_runtime *to_check;
2136 if (signal_pending(current)) {
2137 result = -ERESTARTSYS;
2138 break;
2139 }
2140 /* find a substream to drain */
2141 to_check = NULL;
2142 group = snd_pcm_stream_group_ref(substream);
2143 snd_pcm_group_for_each_entry(s, substream) {
2144 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2145 continue;
2146 runtime = s->runtime;
2147 if (runtime->state == SNDRV_PCM_STATE_DRAINING) {
2148 to_check = runtime;
2149 break;
2150 }
2151 }
2152 snd_pcm_group_unref(group, substream);
2153 if (!to_check)
2154 break; /* all drained */
2155 init_waitqueue_entry(&wait, current);
2156 set_current_state(TASK_INTERRUPTIBLE);
2157 add_wait_queue(&to_check->sleep, &wait);
2158 snd_pcm_stream_unlock_irq(substream);
2159 if (runtime->no_period_wakeup)
2160 tout = MAX_SCHEDULE_TIMEOUT;
2161 else {
2162 tout = 10;
2163 if (runtime->rate) {
2164 long t = runtime->period_size * 2 / runtime->rate;
2165 tout = max(t, tout);
2166 }
2167 tout = msecs_to_jiffies(tout * 1000);
2168 }
2169 tout = schedule_timeout(tout);
2170
2171 snd_pcm_stream_lock_irq(substream);
2172 group = snd_pcm_stream_group_ref(substream);
2173 snd_pcm_group_for_each_entry(s, substream) {
2174 if (s->runtime == to_check) {
2175 remove_wait_queue(&to_check->sleep, &wait);
2176 break;
2177 }
2178 }
2179 snd_pcm_group_unref(group, substream);
2180
2181 if (card->shutdown) {
2182 result = -ENODEV;
2183 break;
2184 }
2185 if (tout == 0) {
2186 if (substream->runtime->state == SNDRV_PCM_STATE_SUSPENDED)
2187 result = -ESTRPIPE;
2188 else {
2189 dev_dbg(substream->pcm->card->dev,
2190 "playback drain error (DMA or IRQ trouble?)\n");
2191 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2192 result = -EIO;
2193 }
2194 break;
2195 }
2196 }
2197
2198 unlock:
2199 snd_pcm_stream_unlock_irq(substream);
2200
2201 return result;
2202}
2203
2204/*
2205 * drop ioctl
2206 *
2207 * Immediately put all linked substreams into SETUP state.
2208 */
2209static int snd_pcm_drop(struct snd_pcm_substream *substream)
2210{
2211 struct snd_pcm_runtime *runtime;
2212 int result = 0;
2213
2214 if (PCM_RUNTIME_CHECK(substream))
2215 return -ENXIO;
2216 runtime = substream->runtime;
2217
2218 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
2219 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
2220 return -EBADFD;
2221
2222 snd_pcm_stream_lock_irq(substream);
2223 /* resume pause */
2224 if (runtime->state == SNDRV_PCM_STATE_PAUSED)
2225 snd_pcm_pause(substream, false);
2226
2227 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2228 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2229 snd_pcm_stream_unlock_irq(substream);
2230
2231 return result;
2232}
2233
2234
2235static bool is_pcm_file(struct file *file)
2236{
2237 struct inode *inode = file_inode(file);
2238 struct snd_pcm *pcm;
2239 unsigned int minor;
2240
2241 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2242 return false;
2243 minor = iminor(inode);
2244 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2245 if (!pcm)
2246 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2247 if (!pcm)
2248 return false;
2249 snd_card_unref(pcm->card);
2250 return true;
2251}
2252
2253/*
2254 * PCM link handling
2255 */
2256static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2257{
2258 int res = 0;
2259 struct snd_pcm_file *pcm_file;
2260 struct snd_pcm_substream *substream1;
2261 struct snd_pcm_group *group, *target_group;
2262 bool nonatomic = substream->pcm->nonatomic;
2263 struct fd f = fdget(fd);
2264
2265 if (!f.file)
2266 return -EBADFD;
2267 if (!is_pcm_file(f.file)) {
2268 res = -EBADFD;
2269 goto _badf;
2270 }
2271 pcm_file = f.file->private_data;
2272 substream1 = pcm_file->substream;
2273
2274 if (substream == substream1) {
2275 res = -EINVAL;
2276 goto _badf;
2277 }
2278
2279 group = kzalloc(sizeof(*group), GFP_KERNEL);
2280 if (!group) {
2281 res = -ENOMEM;
2282 goto _nolock;
2283 }
2284 snd_pcm_group_init(group);
2285
2286 down_write(&snd_pcm_link_rwsem);
2287 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN ||
2288 substream->runtime->state != substream1->runtime->state ||
2289 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2290 res = -EBADFD;
2291 goto _end;
2292 }
2293 if (snd_pcm_stream_linked(substream1)) {
2294 res = -EALREADY;
2295 goto _end;
2296 }
2297
2298 snd_pcm_stream_lock_irq(substream);
2299 if (!snd_pcm_stream_linked(substream)) {
2300 snd_pcm_group_assign(substream, group);
2301 group = NULL; /* assigned, don't free this one below */
2302 }
2303 target_group = substream->group;
2304 snd_pcm_stream_unlock_irq(substream);
2305
2306 snd_pcm_group_lock_irq(target_group, nonatomic);
2307 snd_pcm_stream_lock_nested(substream1);
2308 snd_pcm_group_assign(substream1, target_group);
2309 refcount_inc(&target_group->refs);
2310 snd_pcm_stream_unlock(substream1);
2311 snd_pcm_group_unlock_irq(target_group, nonatomic);
2312 _end:
2313 up_write(&snd_pcm_link_rwsem);
2314 _nolock:
2315 kfree(group);
2316 _badf:
2317 fdput(f);
2318 return res;
2319}
2320
2321static void relink_to_local(struct snd_pcm_substream *substream)
2322{
2323 snd_pcm_stream_lock_nested(substream);
2324 snd_pcm_group_assign(substream, &substream->self_group);
2325 snd_pcm_stream_unlock(substream);
2326}
2327
2328static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2329{
2330 struct snd_pcm_group *group;
2331 bool nonatomic = substream->pcm->nonatomic;
2332 bool do_free = false;
2333 int res = 0;
2334
2335 down_write(&snd_pcm_link_rwsem);
2336
2337 if (!snd_pcm_stream_linked(substream)) {
2338 res = -EALREADY;
2339 goto _end;
2340 }
2341
2342 group = substream->group;
2343 snd_pcm_group_lock_irq(group, nonatomic);
2344
2345 relink_to_local(substream);
2346 refcount_dec(&group->refs);
2347
2348 /* detach the last stream, too */
2349 if (list_is_singular(&group->substreams)) {
2350 relink_to_local(list_first_entry(&group->substreams,
2351 struct snd_pcm_substream,
2352 link_list));
2353 do_free = refcount_dec_and_test(&group->refs);
2354 }
2355
2356 snd_pcm_group_unlock_irq(group, nonatomic);
2357 if (do_free)
2358 kfree(group);
2359
2360 _end:
2361 up_write(&snd_pcm_link_rwsem);
2362 return res;
2363}
2364
2365/*
2366 * hw configurator
2367 */
2368static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2369 struct snd_pcm_hw_rule *rule)
2370{
2371 struct snd_interval t;
2372 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2373 hw_param_interval_c(params, rule->deps[1]), &t);
2374 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2375}
2376
2377static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2378 struct snd_pcm_hw_rule *rule)
2379{
2380 struct snd_interval t;
2381 snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
2382 hw_param_interval_c(params, rule->deps[1]), &t);
2383 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2384}
2385
2386static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2387 struct snd_pcm_hw_rule *rule)
2388{
2389 struct snd_interval t;
2390 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2391 hw_param_interval_c(params, rule->deps[1]),
2392 (unsigned long) rule->private, &t);
2393 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2394}
2395
2396static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2397 struct snd_pcm_hw_rule *rule)
2398{
2399 struct snd_interval t;
2400 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2401 (unsigned long) rule->private,
2402 hw_param_interval_c(params, rule->deps[1]), &t);
2403 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2404}
2405
2406static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2407 struct snd_pcm_hw_rule *rule)
2408{
2409 snd_pcm_format_t k;
2410 const struct snd_interval *i =
2411 hw_param_interval_c(params, rule->deps[0]);
2412 struct snd_mask m;
2413 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2414 snd_mask_any(&m);
2415 pcm_for_each_format(k) {
2416 int bits;
2417 if (!snd_mask_test_format(mask, k))
2418 continue;
2419 bits = snd_pcm_format_physical_width(k);
2420 if (bits <= 0)
2421 continue; /* ignore invalid formats */
2422 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2423 snd_mask_reset(&m, (__force unsigned)k);
2424 }
2425 return snd_mask_refine(mask, &m);
2426}
2427
2428static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2429 struct snd_pcm_hw_rule *rule)
2430{
2431 struct snd_interval t;
2432 snd_pcm_format_t k;
2433
2434 t.min = UINT_MAX;
2435 t.max = 0;
2436 t.openmin = 0;
2437 t.openmax = 0;
2438 pcm_for_each_format(k) {
2439 int bits;
2440 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2441 continue;
2442 bits = snd_pcm_format_physical_width(k);
2443 if (bits <= 0)
2444 continue; /* ignore invalid formats */
2445 if (t.min > (unsigned)bits)
2446 t.min = bits;
2447 if (t.max < (unsigned)bits)
2448 t.max = bits;
2449 }
2450 t.integer = 1;
2451 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2452}
2453
2454#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2455#error "Change this table"
2456#endif
2457
2458static const unsigned int rates[] = {
2459 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2460 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2461};
2462
2463const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2464 .count = ARRAY_SIZE(rates),
2465 .list = rates,
2466};
2467
2468static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2469 struct snd_pcm_hw_rule *rule)
2470{
2471 struct snd_pcm_hardware *hw = rule->private;
2472 return snd_interval_list(hw_param_interval(params, rule->var),
2473 snd_pcm_known_rates.count,
2474 snd_pcm_known_rates.list, hw->rates);
2475}
2476
2477static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2478 struct snd_pcm_hw_rule *rule)
2479{
2480 struct snd_interval t;
2481 struct snd_pcm_substream *substream = rule->private;
2482 t.min = 0;
2483 t.max = substream->buffer_bytes_max;
2484 t.openmin = 0;
2485 t.openmax = 0;
2486 t.integer = 1;
2487 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2488}
2489
2490static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2491{
2492 struct snd_pcm_runtime *runtime = substream->runtime;
2493 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2494 int k, err;
2495
2496 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2497 snd_mask_any(constrs_mask(constrs, k));
2498 }
2499
2500 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2501 snd_interval_any(constrs_interval(constrs, k));
2502 }
2503
2504 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2505 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2506 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2507 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2508 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2509
2510 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2511 snd_pcm_hw_rule_format, NULL,
2512 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2513 if (err < 0)
2514 return err;
2515 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2516 snd_pcm_hw_rule_sample_bits, NULL,
2517 SNDRV_PCM_HW_PARAM_FORMAT,
2518 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2519 if (err < 0)
2520 return err;
2521 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2522 snd_pcm_hw_rule_div, NULL,
2523 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2524 if (err < 0)
2525 return err;
2526 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2527 snd_pcm_hw_rule_mul, NULL,
2528 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2529 if (err < 0)
2530 return err;
2531 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2532 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2533 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2534 if (err < 0)
2535 return err;
2536 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2537 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2538 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2539 if (err < 0)
2540 return err;
2541 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2542 snd_pcm_hw_rule_div, NULL,
2543 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2544 if (err < 0)
2545 return err;
2546 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2547 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2548 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2549 if (err < 0)
2550 return err;
2551 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2552 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2553 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2554 if (err < 0)
2555 return err;
2556 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2557 snd_pcm_hw_rule_div, NULL,
2558 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2559 if (err < 0)
2560 return err;
2561 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2562 snd_pcm_hw_rule_div, NULL,
2563 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2564 if (err < 0)
2565 return err;
2566 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2567 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2568 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2569 if (err < 0)
2570 return err;
2571 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2572 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2573 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2574 if (err < 0)
2575 return err;
2576 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2577 snd_pcm_hw_rule_mul, NULL,
2578 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2579 if (err < 0)
2580 return err;
2581 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2582 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2583 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2584 if (err < 0)
2585 return err;
2586 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2587 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2588 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2589 if (err < 0)
2590 return err;
2591 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2592 snd_pcm_hw_rule_muldivk, (void*) 8,
2593 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2594 if (err < 0)
2595 return err;
2596 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2597 snd_pcm_hw_rule_muldivk, (void*) 8,
2598 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2599 if (err < 0)
2600 return err;
2601 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2602 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2603 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2604 if (err < 0)
2605 return err;
2606 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2607 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2608 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2609 if (err < 0)
2610 return err;
2611 return 0;
2612}
2613
2614static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2615{
2616 struct snd_pcm_runtime *runtime = substream->runtime;
2617 struct snd_pcm_hardware *hw = &runtime->hw;
2618 int err;
2619 unsigned int mask = 0;
2620
2621 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2622 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2623 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2624 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2625 if (hw_support_mmap(substream)) {
2626 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2627 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2628 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2629 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2630 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2631 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2632 }
2633 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2634 if (err < 0)
2635 return err;
2636
2637 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2638 if (err < 0)
2639 return err;
2640
2641 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2642 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2643 if (err < 0)
2644 return err;
2645
2646 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2647 hw->channels_min, hw->channels_max);
2648 if (err < 0)
2649 return err;
2650
2651 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2652 hw->rate_min, hw->rate_max);
2653 if (err < 0)
2654 return err;
2655
2656 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2657 hw->period_bytes_min, hw->period_bytes_max);
2658 if (err < 0)
2659 return err;
2660
2661 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2662 hw->periods_min, hw->periods_max);
2663 if (err < 0)
2664 return err;
2665
2666 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2667 hw->period_bytes_min, hw->buffer_bytes_max);
2668 if (err < 0)
2669 return err;
2670
2671 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2672 snd_pcm_hw_rule_buffer_bytes_max, substream,
2673 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2674 if (err < 0)
2675 return err;
2676
2677 /* FIXME: remove */
2678 if (runtime->dma_bytes) {
2679 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2680 if (err < 0)
2681 return err;
2682 }
2683
2684 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2685 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2686 snd_pcm_hw_rule_rate, hw,
2687 SNDRV_PCM_HW_PARAM_RATE, -1);
2688 if (err < 0)
2689 return err;
2690 }
2691
2692 /* FIXME: this belong to lowlevel */
2693 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2694
2695 return 0;
2696}
2697
2698static void pcm_release_private(struct snd_pcm_substream *substream)
2699{
2700 if (snd_pcm_stream_linked(substream))
2701 snd_pcm_unlink(substream);
2702}
2703
2704void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2705{
2706 substream->ref_count--;
2707 if (substream->ref_count > 0)
2708 return;
2709
2710 snd_pcm_drop(substream);
2711 if (substream->hw_opened) {
2712 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
2713 do_hw_free(substream);
2714 substream->ops->close(substream);
2715 substream->hw_opened = 0;
2716 }
2717 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2718 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2719 if (substream->pcm_release) {
2720 substream->pcm_release(substream);
2721 substream->pcm_release = NULL;
2722 }
2723 snd_pcm_detach_substream(substream);
2724}
2725EXPORT_SYMBOL(snd_pcm_release_substream);
2726
2727int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2728 struct file *file,
2729 struct snd_pcm_substream **rsubstream)
2730{
2731 struct snd_pcm_substream *substream;
2732 int err;
2733
2734 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2735 if (err < 0)
2736 return err;
2737 if (substream->ref_count > 1) {
2738 *rsubstream = substream;
2739 return 0;
2740 }
2741
2742 err = snd_pcm_hw_constraints_init(substream);
2743 if (err < 0) {
2744 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2745 goto error;
2746 }
2747
2748 err = substream->ops->open(substream);
2749 if (err < 0)
2750 goto error;
2751
2752 substream->hw_opened = 1;
2753
2754 err = snd_pcm_hw_constraints_complete(substream);
2755 if (err < 0) {
2756 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2757 goto error;
2758 }
2759
2760 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2761 * the DMA buffer requires it
2762 */
2763 if (substream->managed_buffer_alloc &&
2764 substream->dma_buffer.dev.need_sync)
2765 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2766
2767 *rsubstream = substream;
2768 return 0;
2769
2770 error:
2771 snd_pcm_release_substream(substream);
2772 return err;
2773}
2774EXPORT_SYMBOL(snd_pcm_open_substream);
2775
2776static int snd_pcm_open_file(struct file *file,
2777 struct snd_pcm *pcm,
2778 int stream)
2779{
2780 struct snd_pcm_file *pcm_file;
2781 struct snd_pcm_substream *substream;
2782 int err;
2783
2784 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2785 if (err < 0)
2786 return err;
2787
2788 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2789 if (pcm_file == NULL) {
2790 snd_pcm_release_substream(substream);
2791 return -ENOMEM;
2792 }
2793 pcm_file->substream = substream;
2794 if (substream->ref_count == 1)
2795 substream->pcm_release = pcm_release_private;
2796 file->private_data = pcm_file;
2797
2798 return 0;
2799}
2800
2801static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2802{
2803 struct snd_pcm *pcm;
2804 int err = nonseekable_open(inode, file);
2805 if (err < 0)
2806 return err;
2807 pcm = snd_lookup_minor_data(iminor(inode),
2808 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2809 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2810 if (pcm)
2811 snd_card_unref(pcm->card);
2812 return err;
2813}
2814
2815static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2816{
2817 struct snd_pcm *pcm;
2818 int err = nonseekable_open(inode, file);
2819 if (err < 0)
2820 return err;
2821 pcm = snd_lookup_minor_data(iminor(inode),
2822 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2823 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2824 if (pcm)
2825 snd_card_unref(pcm->card);
2826 return err;
2827}
2828
2829static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2830{
2831 int err;
2832 wait_queue_entry_t wait;
2833
2834 if (pcm == NULL) {
2835 err = -ENODEV;
2836 goto __error1;
2837 }
2838 err = snd_card_file_add(pcm->card, file);
2839 if (err < 0)
2840 goto __error1;
2841 if (!try_module_get(pcm->card->module)) {
2842 err = -EFAULT;
2843 goto __error2;
2844 }
2845 init_waitqueue_entry(&wait, current);
2846 add_wait_queue(&pcm->open_wait, &wait);
2847 mutex_lock(&pcm->open_mutex);
2848 while (1) {
2849 err = snd_pcm_open_file(file, pcm, stream);
2850 if (err >= 0)
2851 break;
2852 if (err == -EAGAIN) {
2853 if (file->f_flags & O_NONBLOCK) {
2854 err = -EBUSY;
2855 break;
2856 }
2857 } else
2858 break;
2859 set_current_state(TASK_INTERRUPTIBLE);
2860 mutex_unlock(&pcm->open_mutex);
2861 schedule();
2862 mutex_lock(&pcm->open_mutex);
2863 if (pcm->card->shutdown) {
2864 err = -ENODEV;
2865 break;
2866 }
2867 if (signal_pending(current)) {
2868 err = -ERESTARTSYS;
2869 break;
2870 }
2871 }
2872 remove_wait_queue(&pcm->open_wait, &wait);
2873 mutex_unlock(&pcm->open_mutex);
2874 if (err < 0)
2875 goto __error;
2876 return err;
2877
2878 __error:
2879 module_put(pcm->card->module);
2880 __error2:
2881 snd_card_file_remove(pcm->card, file);
2882 __error1:
2883 return err;
2884}
2885
2886static int snd_pcm_release(struct inode *inode, struct file *file)
2887{
2888 struct snd_pcm *pcm;
2889 struct snd_pcm_substream *substream;
2890 struct snd_pcm_file *pcm_file;
2891
2892 pcm_file = file->private_data;
2893 substream = pcm_file->substream;
2894 if (snd_BUG_ON(!substream))
2895 return -ENXIO;
2896 pcm = substream->pcm;
2897
2898 /* block until the device gets woken up as it may touch the hardware */
2899 snd_power_wait(pcm->card);
2900
2901 mutex_lock(&pcm->open_mutex);
2902 snd_pcm_release_substream(substream);
2903 kfree(pcm_file);
2904 mutex_unlock(&pcm->open_mutex);
2905 wake_up(&pcm->open_wait);
2906 module_put(pcm->card->module);
2907 snd_card_file_remove(pcm->card, file);
2908 return 0;
2909}
2910
2911/* check and update PCM state; return 0 or a negative error
2912 * call this inside PCM lock
2913 */
2914static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2915{
2916 switch (substream->runtime->state) {
2917 case SNDRV_PCM_STATE_DRAINING:
2918 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2919 return -EBADFD;
2920 fallthrough;
2921 case SNDRV_PCM_STATE_RUNNING:
2922 return snd_pcm_update_hw_ptr(substream);
2923 case SNDRV_PCM_STATE_PREPARED:
2924 case SNDRV_PCM_STATE_PAUSED:
2925 return 0;
2926 case SNDRV_PCM_STATE_SUSPENDED:
2927 return -ESTRPIPE;
2928 case SNDRV_PCM_STATE_XRUN:
2929 return -EPIPE;
2930 default:
2931 return -EBADFD;
2932 }
2933}
2934
2935/* increase the appl_ptr; returns the processed frames or a negative error */
2936static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2937 snd_pcm_uframes_t frames,
2938 snd_pcm_sframes_t avail)
2939{
2940 struct snd_pcm_runtime *runtime = substream->runtime;
2941 snd_pcm_sframes_t appl_ptr;
2942 int ret;
2943
2944 if (avail <= 0)
2945 return 0;
2946 if (frames > (snd_pcm_uframes_t)avail)
2947 frames = avail;
2948 appl_ptr = runtime->control->appl_ptr + frames;
2949 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2950 appl_ptr -= runtime->boundary;
2951 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2952 return ret < 0 ? ret : frames;
2953}
2954
2955/* decrease the appl_ptr; returns the processed frames or zero for error */
2956static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2957 snd_pcm_uframes_t frames,
2958 snd_pcm_sframes_t avail)
2959{
2960 struct snd_pcm_runtime *runtime = substream->runtime;
2961 snd_pcm_sframes_t appl_ptr;
2962 int ret;
2963
2964 if (avail <= 0)
2965 return 0;
2966 if (frames > (snd_pcm_uframes_t)avail)
2967 frames = avail;
2968 appl_ptr = runtime->control->appl_ptr - frames;
2969 if (appl_ptr < 0)
2970 appl_ptr += runtime->boundary;
2971 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2972 /* NOTE: we return zero for errors because PulseAudio gets depressed
2973 * upon receiving an error from rewind ioctl and stops processing
2974 * any longer. Returning zero means that no rewind is done, so
2975 * it's not absolutely wrong to answer like that.
2976 */
2977 return ret < 0 ? 0 : frames;
2978}
2979
2980static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2981 snd_pcm_uframes_t frames)
2982{
2983 snd_pcm_sframes_t ret;
2984
2985 if (frames == 0)
2986 return 0;
2987
2988 snd_pcm_stream_lock_irq(substream);
2989 ret = do_pcm_hwsync(substream);
2990 if (!ret)
2991 ret = rewind_appl_ptr(substream, frames,
2992 snd_pcm_hw_avail(substream));
2993 snd_pcm_stream_unlock_irq(substream);
2994 if (ret >= 0)
2995 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2996 return ret;
2997}
2998
2999static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
3000 snd_pcm_uframes_t frames)
3001{
3002 snd_pcm_sframes_t ret;
3003
3004 if (frames == 0)
3005 return 0;
3006
3007 snd_pcm_stream_lock_irq(substream);
3008 ret = do_pcm_hwsync(substream);
3009 if (!ret)
3010 ret = forward_appl_ptr(substream, frames,
3011 snd_pcm_avail(substream));
3012 snd_pcm_stream_unlock_irq(substream);
3013 if (ret >= 0)
3014 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3015 return ret;
3016}
3017
3018static int snd_pcm_delay(struct snd_pcm_substream *substream,
3019 snd_pcm_sframes_t *delay)
3020{
3021 int err;
3022
3023 snd_pcm_stream_lock_irq(substream);
3024 err = do_pcm_hwsync(substream);
3025 if (delay && !err)
3026 *delay = snd_pcm_calc_delay(substream);
3027 snd_pcm_stream_unlock_irq(substream);
3028 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3029
3030 return err;
3031}
3032
3033static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3034{
3035 return snd_pcm_delay(substream, NULL);
3036}
3037
3038static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3039 struct snd_pcm_sync_ptr __user *_sync_ptr)
3040{
3041 struct snd_pcm_runtime *runtime = substream->runtime;
3042 struct snd_pcm_sync_ptr sync_ptr;
3043 volatile struct snd_pcm_mmap_status *status;
3044 volatile struct snd_pcm_mmap_control *control;
3045 int err;
3046
3047 memset(&sync_ptr, 0, sizeof(sync_ptr));
3048 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3049 return -EFAULT;
3050 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3051 return -EFAULT;
3052 status = runtime->status;
3053 control = runtime->control;
3054 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3055 err = snd_pcm_hwsync(substream);
3056 if (err < 0)
3057 return err;
3058 }
3059 snd_pcm_stream_lock_irq(substream);
3060 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3061 err = pcm_lib_apply_appl_ptr(substream,
3062 sync_ptr.c.control.appl_ptr);
3063 if (err < 0) {
3064 snd_pcm_stream_unlock_irq(substream);
3065 return err;
3066 }
3067 } else {
3068 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3069 }
3070 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3071 control->avail_min = sync_ptr.c.control.avail_min;
3072 else
3073 sync_ptr.c.control.avail_min = control->avail_min;
3074 sync_ptr.s.status.state = status->state;
3075 sync_ptr.s.status.hw_ptr = status->hw_ptr;
3076 sync_ptr.s.status.tstamp = status->tstamp;
3077 sync_ptr.s.status.suspended_state = status->suspended_state;
3078 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3079 snd_pcm_stream_unlock_irq(substream);
3080 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3081 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3082 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3083 return -EFAULT;
3084 return 0;
3085}
3086
3087struct snd_pcm_mmap_status32 {
3088 snd_pcm_state_t state;
3089 s32 pad1;
3090 u32 hw_ptr;
3091 s32 tstamp_sec;
3092 s32 tstamp_nsec;
3093 snd_pcm_state_t suspended_state;
3094 s32 audio_tstamp_sec;
3095 s32 audio_tstamp_nsec;
3096} __attribute__((packed));
3097
3098struct snd_pcm_mmap_control32 {
3099 u32 appl_ptr;
3100 u32 avail_min;
3101};
3102
3103struct snd_pcm_sync_ptr32 {
3104 u32 flags;
3105 union {
3106 struct snd_pcm_mmap_status32 status;
3107 unsigned char reserved[64];
3108 } s;
3109 union {
3110 struct snd_pcm_mmap_control32 control;
3111 unsigned char reserved[64];
3112 } c;
3113} __attribute__((packed));
3114
3115/* recalcuate the boundary within 32bit */
3116static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3117{
3118 snd_pcm_uframes_t boundary;
3119
3120 if (! runtime->buffer_size)
3121 return 0;
3122 boundary = runtime->buffer_size;
3123 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3124 boundary *= 2;
3125 return boundary;
3126}
3127
3128static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3129 struct snd_pcm_sync_ptr32 __user *src)
3130{
3131 struct snd_pcm_runtime *runtime = substream->runtime;
3132 volatile struct snd_pcm_mmap_status *status;
3133 volatile struct snd_pcm_mmap_control *control;
3134 u32 sflags;
3135 struct snd_pcm_mmap_control scontrol;
3136 struct snd_pcm_mmap_status sstatus;
3137 snd_pcm_uframes_t boundary;
3138 int err;
3139
3140 if (snd_BUG_ON(!runtime))
3141 return -EINVAL;
3142
3143 if (get_user(sflags, &src->flags) ||
3144 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3145 get_user(scontrol.avail_min, &src->c.control.avail_min))
3146 return -EFAULT;
3147 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3148 err = snd_pcm_hwsync(substream);
3149 if (err < 0)
3150 return err;
3151 }
3152 status = runtime->status;
3153 control = runtime->control;
3154 boundary = recalculate_boundary(runtime);
3155 if (! boundary)
3156 boundary = 0x7fffffff;
3157 snd_pcm_stream_lock_irq(substream);
3158 /* FIXME: we should consider the boundary for the sync from app */
3159 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3160 err = pcm_lib_apply_appl_ptr(substream,
3161 scontrol.appl_ptr);
3162 if (err < 0) {
3163 snd_pcm_stream_unlock_irq(substream);
3164 return err;
3165 }
3166 } else
3167 scontrol.appl_ptr = control->appl_ptr % boundary;
3168 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3169 control->avail_min = scontrol.avail_min;
3170 else
3171 scontrol.avail_min = control->avail_min;
3172 sstatus.state = status->state;
3173 sstatus.hw_ptr = status->hw_ptr % boundary;
3174 sstatus.tstamp = status->tstamp;
3175 sstatus.suspended_state = status->suspended_state;
3176 sstatus.audio_tstamp = status->audio_tstamp;
3177 snd_pcm_stream_unlock_irq(substream);
3178 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3179 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3180 if (put_user(sstatus.state, &src->s.status.state) ||
3181 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3182 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3183 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3184 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3185 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3186 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3187 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3188 put_user(scontrol.avail_min, &src->c.control.avail_min))
3189 return -EFAULT;
3190
3191 return 0;
3192}
3193#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3194
3195static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3196{
3197 struct snd_pcm_runtime *runtime = substream->runtime;
3198 int arg;
3199
3200 if (get_user(arg, _arg))
3201 return -EFAULT;
3202 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3203 return -EINVAL;
3204 runtime->tstamp_type = arg;
3205 return 0;
3206}
3207
3208static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3209 struct snd_xferi __user *_xferi)
3210{
3211 struct snd_xferi xferi;
3212 struct snd_pcm_runtime *runtime = substream->runtime;
3213 snd_pcm_sframes_t result;
3214
3215 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3216 return -EBADFD;
3217 if (put_user(0, &_xferi->result))
3218 return -EFAULT;
3219 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3220 return -EFAULT;
3221 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3222 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3223 else
3224 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3225 if (put_user(result, &_xferi->result))
3226 return -EFAULT;
3227 return result < 0 ? result : 0;
3228}
3229
3230static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3231 struct snd_xfern __user *_xfern)
3232{
3233 struct snd_xfern xfern;
3234 struct snd_pcm_runtime *runtime = substream->runtime;
3235 void *bufs;
3236 snd_pcm_sframes_t result;
3237
3238 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3239 return -EBADFD;
3240 if (runtime->channels > 128)
3241 return -EINVAL;
3242 if (put_user(0, &_xfern->result))
3243 return -EFAULT;
3244 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3245 return -EFAULT;
3246
3247 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3248 if (IS_ERR(bufs))
3249 return PTR_ERR(bufs);
3250 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3251 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3252 else
3253 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3254 kfree(bufs);
3255 if (put_user(result, &_xfern->result))
3256 return -EFAULT;
3257 return result < 0 ? result : 0;
3258}
3259
3260static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3261 snd_pcm_uframes_t __user *_frames)
3262{
3263 snd_pcm_uframes_t frames;
3264 snd_pcm_sframes_t result;
3265
3266 if (get_user(frames, _frames))
3267 return -EFAULT;
3268 if (put_user(0, _frames))
3269 return -EFAULT;
3270 result = snd_pcm_rewind(substream, frames);
3271 if (put_user(result, _frames))
3272 return -EFAULT;
3273 return result < 0 ? result : 0;
3274}
3275
3276static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3277 snd_pcm_uframes_t __user *_frames)
3278{
3279 snd_pcm_uframes_t frames;
3280 snd_pcm_sframes_t result;
3281
3282 if (get_user(frames, _frames))
3283 return -EFAULT;
3284 if (put_user(0, _frames))
3285 return -EFAULT;
3286 result = snd_pcm_forward(substream, frames);
3287 if (put_user(result, _frames))
3288 return -EFAULT;
3289 return result < 0 ? result : 0;
3290}
3291
3292static int snd_pcm_common_ioctl(struct file *file,
3293 struct snd_pcm_substream *substream,
3294 unsigned int cmd, void __user *arg)
3295{
3296 struct snd_pcm_file *pcm_file = file->private_data;
3297 int res;
3298
3299 if (PCM_RUNTIME_CHECK(substream))
3300 return -ENXIO;
3301
3302 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3303 return -EBADFD;
3304
3305 res = snd_power_wait(substream->pcm->card);
3306 if (res < 0)
3307 return res;
3308
3309 switch (cmd) {
3310 case SNDRV_PCM_IOCTL_PVERSION:
3311 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3312 case SNDRV_PCM_IOCTL_INFO:
3313 return snd_pcm_info_user(substream, arg);
3314 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3315 return 0;
3316 case SNDRV_PCM_IOCTL_TTSTAMP:
3317 return snd_pcm_tstamp(substream, arg);
3318 case SNDRV_PCM_IOCTL_USER_PVERSION:
3319 if (get_user(pcm_file->user_pversion,
3320 (unsigned int __user *)arg))
3321 return -EFAULT;
3322 return 0;
3323 case SNDRV_PCM_IOCTL_HW_REFINE:
3324 return snd_pcm_hw_refine_user(substream, arg);
3325 case SNDRV_PCM_IOCTL_HW_PARAMS:
3326 return snd_pcm_hw_params_user(substream, arg);
3327 case SNDRV_PCM_IOCTL_HW_FREE:
3328 return snd_pcm_hw_free(substream);
3329 case SNDRV_PCM_IOCTL_SW_PARAMS:
3330 return snd_pcm_sw_params_user(substream, arg);
3331 case SNDRV_PCM_IOCTL_STATUS32:
3332 return snd_pcm_status_user32(substream, arg, false);
3333 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3334 return snd_pcm_status_user32(substream, arg, true);
3335 case SNDRV_PCM_IOCTL_STATUS64:
3336 return snd_pcm_status_user64(substream, arg, false);
3337 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3338 return snd_pcm_status_user64(substream, arg, true);
3339 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3340 return snd_pcm_channel_info_user(substream, arg);
3341 case SNDRV_PCM_IOCTL_PREPARE:
3342 return snd_pcm_prepare(substream, file);
3343 case SNDRV_PCM_IOCTL_RESET:
3344 return snd_pcm_reset(substream);
3345 case SNDRV_PCM_IOCTL_START:
3346 return snd_pcm_start_lock_irq(substream);
3347 case SNDRV_PCM_IOCTL_LINK:
3348 return snd_pcm_link(substream, (int)(unsigned long) arg);
3349 case SNDRV_PCM_IOCTL_UNLINK:
3350 return snd_pcm_unlink(substream);
3351 case SNDRV_PCM_IOCTL_RESUME:
3352 return snd_pcm_resume(substream);
3353 case SNDRV_PCM_IOCTL_XRUN:
3354 return snd_pcm_xrun(substream);
3355 case SNDRV_PCM_IOCTL_HWSYNC:
3356 return snd_pcm_hwsync(substream);
3357 case SNDRV_PCM_IOCTL_DELAY:
3358 {
3359 snd_pcm_sframes_t delay = 0;
3360 snd_pcm_sframes_t __user *res = arg;
3361 int err;
3362
3363 err = snd_pcm_delay(substream, &delay);
3364 if (err)
3365 return err;
3366 if (put_user(delay, res))
3367 return -EFAULT;
3368 return 0;
3369 }
3370 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3371 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3372 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3373 return snd_pcm_sync_ptr(substream, arg);
3374#ifdef CONFIG_SND_SUPPORT_OLD_API
3375 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3376 return snd_pcm_hw_refine_old_user(substream, arg);
3377 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3378 return snd_pcm_hw_params_old_user(substream, arg);
3379#endif
3380 case SNDRV_PCM_IOCTL_DRAIN:
3381 return snd_pcm_drain(substream, file);
3382 case SNDRV_PCM_IOCTL_DROP:
3383 return snd_pcm_drop(substream);
3384 case SNDRV_PCM_IOCTL_PAUSE:
3385 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3386 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3387 case SNDRV_PCM_IOCTL_READI_FRAMES:
3388 return snd_pcm_xferi_frames_ioctl(substream, arg);
3389 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3390 case SNDRV_PCM_IOCTL_READN_FRAMES:
3391 return snd_pcm_xfern_frames_ioctl(substream, arg);
3392 case SNDRV_PCM_IOCTL_REWIND:
3393 return snd_pcm_rewind_ioctl(substream, arg);
3394 case SNDRV_PCM_IOCTL_FORWARD:
3395 return snd_pcm_forward_ioctl(substream, arg);
3396 }
3397 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3398 return -ENOTTY;
3399}
3400
3401static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3402 unsigned long arg)
3403{
3404 struct snd_pcm_file *pcm_file;
3405
3406 pcm_file = file->private_data;
3407
3408 if (((cmd >> 8) & 0xff) != 'A')
3409 return -ENOTTY;
3410
3411 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3412 (void __user *)arg);
3413}
3414
3415/**
3416 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3417 * @substream: PCM substream
3418 * @cmd: IOCTL cmd
3419 * @arg: IOCTL argument
3420 *
3421 * The function is provided primarily for OSS layer and USB gadget drivers,
3422 * and it allows only the limited set of ioctls (hw_params, sw_params,
3423 * prepare, start, drain, drop, forward).
3424 *
3425 * Return: zero if successful, or a negative error code
3426 */
3427int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3428 unsigned int cmd, void *arg)
3429{
3430 snd_pcm_uframes_t *frames = arg;
3431 snd_pcm_sframes_t result;
3432
3433 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3434 return -EBADFD;
3435
3436 switch (cmd) {
3437 case SNDRV_PCM_IOCTL_FORWARD:
3438 {
3439 /* provided only for OSS; capture-only and no value returned */
3440 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3441 return -EINVAL;
3442 result = snd_pcm_forward(substream, *frames);
3443 return result < 0 ? result : 0;
3444 }
3445 case SNDRV_PCM_IOCTL_HW_PARAMS:
3446 return snd_pcm_hw_params(substream, arg);
3447 case SNDRV_PCM_IOCTL_SW_PARAMS:
3448 return snd_pcm_sw_params(substream, arg);
3449 case SNDRV_PCM_IOCTL_PREPARE:
3450 return snd_pcm_prepare(substream, NULL);
3451 case SNDRV_PCM_IOCTL_START:
3452 return snd_pcm_start_lock_irq(substream);
3453 case SNDRV_PCM_IOCTL_DRAIN:
3454 return snd_pcm_drain(substream, NULL);
3455 case SNDRV_PCM_IOCTL_DROP:
3456 return snd_pcm_drop(substream);
3457 case SNDRV_PCM_IOCTL_DELAY:
3458 return snd_pcm_delay(substream, frames);
3459 default:
3460 return -EINVAL;
3461 }
3462}
3463EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3464
3465static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3466 loff_t * offset)
3467{
3468 struct snd_pcm_file *pcm_file;
3469 struct snd_pcm_substream *substream;
3470 struct snd_pcm_runtime *runtime;
3471 snd_pcm_sframes_t result;
3472
3473 pcm_file = file->private_data;
3474 substream = pcm_file->substream;
3475 if (PCM_RUNTIME_CHECK(substream))
3476 return -ENXIO;
3477 runtime = substream->runtime;
3478 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3479 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3480 return -EBADFD;
3481 if (!frame_aligned(runtime, count))
3482 return -EINVAL;
3483 count = bytes_to_frames(runtime, count);
3484 result = snd_pcm_lib_read(substream, buf, count);
3485 if (result > 0)
3486 result = frames_to_bytes(runtime, result);
3487 return result;
3488}
3489
3490static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3491 size_t count, loff_t * offset)
3492{
3493 struct snd_pcm_file *pcm_file;
3494 struct snd_pcm_substream *substream;
3495 struct snd_pcm_runtime *runtime;
3496 snd_pcm_sframes_t result;
3497
3498 pcm_file = file->private_data;
3499 substream = pcm_file->substream;
3500 if (PCM_RUNTIME_CHECK(substream))
3501 return -ENXIO;
3502 runtime = substream->runtime;
3503 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3504 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3505 return -EBADFD;
3506 if (!frame_aligned(runtime, count))
3507 return -EINVAL;
3508 count = bytes_to_frames(runtime, count);
3509 result = snd_pcm_lib_write(substream, buf, count);
3510 if (result > 0)
3511 result = frames_to_bytes(runtime, result);
3512 return result;
3513}
3514
3515static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3516{
3517 struct snd_pcm_file *pcm_file;
3518 struct snd_pcm_substream *substream;
3519 struct snd_pcm_runtime *runtime;
3520 snd_pcm_sframes_t result;
3521 unsigned long i;
3522 void __user **bufs;
3523 snd_pcm_uframes_t frames;
3524
3525 pcm_file = iocb->ki_filp->private_data;
3526 substream = pcm_file->substream;
3527 if (PCM_RUNTIME_CHECK(substream))
3528 return -ENXIO;
3529 runtime = substream->runtime;
3530 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3531 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3532 return -EBADFD;
3533 if (!iter_is_iovec(to))
3534 return -EINVAL;
3535 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3536 return -EINVAL;
3537 if (!frame_aligned(runtime, to->iov->iov_len))
3538 return -EINVAL;
3539 frames = bytes_to_samples(runtime, to->iov->iov_len);
3540 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3541 if (bufs == NULL)
3542 return -ENOMEM;
3543 for (i = 0; i < to->nr_segs; ++i)
3544 bufs[i] = to->iov[i].iov_base;
3545 result = snd_pcm_lib_readv(substream, bufs, frames);
3546 if (result > 0)
3547 result = frames_to_bytes(runtime, result);
3548 kfree(bufs);
3549 return result;
3550}
3551
3552static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3553{
3554 struct snd_pcm_file *pcm_file;
3555 struct snd_pcm_substream *substream;
3556 struct snd_pcm_runtime *runtime;
3557 snd_pcm_sframes_t result;
3558 unsigned long i;
3559 void __user **bufs;
3560 snd_pcm_uframes_t frames;
3561
3562 pcm_file = iocb->ki_filp->private_data;
3563 substream = pcm_file->substream;
3564 if (PCM_RUNTIME_CHECK(substream))
3565 return -ENXIO;
3566 runtime = substream->runtime;
3567 if (runtime->state == SNDRV_PCM_STATE_OPEN ||
3568 runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3569 return -EBADFD;
3570 if (!iter_is_iovec(from))
3571 return -EINVAL;
3572 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3573 !frame_aligned(runtime, from->iov->iov_len))
3574 return -EINVAL;
3575 frames = bytes_to_samples(runtime, from->iov->iov_len);
3576 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3577 if (bufs == NULL)
3578 return -ENOMEM;
3579 for (i = 0; i < from->nr_segs; ++i)
3580 bufs[i] = from->iov[i].iov_base;
3581 result = snd_pcm_lib_writev(substream, bufs, frames);
3582 if (result > 0)
3583 result = frames_to_bytes(runtime, result);
3584 kfree(bufs);
3585 return result;
3586}
3587
3588static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3589{
3590 struct snd_pcm_file *pcm_file;
3591 struct snd_pcm_substream *substream;
3592 struct snd_pcm_runtime *runtime;
3593 __poll_t mask, ok;
3594 snd_pcm_uframes_t avail;
3595
3596 pcm_file = file->private_data;
3597
3598 substream = pcm_file->substream;
3599 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3600 ok = EPOLLOUT | EPOLLWRNORM;
3601 else
3602 ok = EPOLLIN | EPOLLRDNORM;
3603 if (PCM_RUNTIME_CHECK(substream))
3604 return ok | EPOLLERR;
3605
3606 runtime = substream->runtime;
3607 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3608 return ok | EPOLLERR;
3609
3610 poll_wait(file, &runtime->sleep, wait);
3611
3612 mask = 0;
3613 snd_pcm_stream_lock_irq(substream);
3614 avail = snd_pcm_avail(substream);
3615 switch (runtime->state) {
3616 case SNDRV_PCM_STATE_RUNNING:
3617 case SNDRV_PCM_STATE_PREPARED:
3618 case SNDRV_PCM_STATE_PAUSED:
3619 if (avail >= runtime->control->avail_min)
3620 mask = ok;
3621 break;
3622 case SNDRV_PCM_STATE_DRAINING:
3623 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3624 mask = ok;
3625 if (!avail)
3626 mask |= EPOLLERR;
3627 }
3628 break;
3629 default:
3630 mask = ok | EPOLLERR;
3631 break;
3632 }
3633 snd_pcm_stream_unlock_irq(substream);
3634 return mask;
3635}
3636
3637/*
3638 * mmap support
3639 */
3640
3641/*
3642 * Only on coherent architectures, we can mmap the status and the control records
3643 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3644 */
3645#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3646/*
3647 * mmap status record
3648 */
3649static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3650{
3651 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3652 struct snd_pcm_runtime *runtime;
3653
3654 if (substream == NULL)
3655 return VM_FAULT_SIGBUS;
3656 runtime = substream->runtime;
3657 vmf->page = virt_to_page(runtime->status);
3658 get_page(vmf->page);
3659 return 0;
3660}
3661
3662static const struct vm_operations_struct snd_pcm_vm_ops_status =
3663{
3664 .fault = snd_pcm_mmap_status_fault,
3665};
3666
3667static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3668 struct vm_area_struct *area)
3669{
3670 long size;
3671 if (!(area->vm_flags & VM_READ))
3672 return -EINVAL;
3673 size = area->vm_end - area->vm_start;
3674 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3675 return -EINVAL;
3676 area->vm_ops = &snd_pcm_vm_ops_status;
3677 area->vm_private_data = substream;
3678 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3679 area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
3680 return 0;
3681}
3682
3683/*
3684 * mmap control record
3685 */
3686static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3687{
3688 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3689 struct snd_pcm_runtime *runtime;
3690
3691 if (substream == NULL)
3692 return VM_FAULT_SIGBUS;
3693 runtime = substream->runtime;
3694 vmf->page = virt_to_page(runtime->control);
3695 get_page(vmf->page);
3696 return 0;
3697}
3698
3699static const struct vm_operations_struct snd_pcm_vm_ops_control =
3700{
3701 .fault = snd_pcm_mmap_control_fault,
3702};
3703
3704static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3705 struct vm_area_struct *area)
3706{
3707 long size;
3708 if (!(area->vm_flags & VM_READ))
3709 return -EINVAL;
3710 size = area->vm_end - area->vm_start;
3711 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3712 return -EINVAL;
3713 area->vm_ops = &snd_pcm_vm_ops_control;
3714 area->vm_private_data = substream;
3715 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3716 return 0;
3717}
3718
3719static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3720{
3721 /* If drivers require the explicit sync (typically for non-coherent
3722 * pages), we have to disable the mmap of status and control data
3723 * to enforce the control via SYNC_PTR ioctl.
3724 */
3725 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3726 return false;
3727 /* See pcm_control_mmap_allowed() below.
3728 * Since older alsa-lib requires both status and control mmaps to be
3729 * coupled, we have to disable the status mmap for old alsa-lib, too.
3730 */
3731 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3732 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3733 return false;
3734 return true;
3735}
3736
3737static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3738{
3739 if (pcm_file->no_compat_mmap)
3740 return false;
3741 /* see above */
3742 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3743 return false;
3744 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3745 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3746 * thus it effectively assures the manual update of appl_ptr.
3747 */
3748 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3749 return false;
3750 return true;
3751}
3752
3753#else /* ! coherent mmap */
3754/*
3755 * don't support mmap for status and control records.
3756 */
3757#define pcm_status_mmap_allowed(pcm_file) false
3758#define pcm_control_mmap_allowed(pcm_file) false
3759
3760static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3761 struct vm_area_struct *area)
3762{
3763 return -ENXIO;
3764}
3765static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3766 struct vm_area_struct *area)
3767{
3768 return -ENXIO;
3769}
3770#endif /* coherent mmap */
3771
3772/*
3773 * fault callback for mmapping a RAM page
3774 */
3775static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3776{
3777 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3778 struct snd_pcm_runtime *runtime;
3779 unsigned long offset;
3780 struct page * page;
3781 size_t dma_bytes;
3782
3783 if (substream == NULL)
3784 return VM_FAULT_SIGBUS;
3785 runtime = substream->runtime;
3786 offset = vmf->pgoff << PAGE_SHIFT;
3787 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3788 if (offset > dma_bytes - PAGE_SIZE)
3789 return VM_FAULT_SIGBUS;
3790 if (substream->ops->page)
3791 page = substream->ops->page(substream, offset);
3792 else if (!snd_pcm_get_dma_buf(substream))
3793 page = virt_to_page(runtime->dma_area + offset);
3794 else
3795 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3796 if (!page)
3797 return VM_FAULT_SIGBUS;
3798 get_page(page);
3799 vmf->page = page;
3800 return 0;
3801}
3802
3803static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3804 .open = snd_pcm_mmap_data_open,
3805 .close = snd_pcm_mmap_data_close,
3806};
3807
3808static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3809 .open = snd_pcm_mmap_data_open,
3810 .close = snd_pcm_mmap_data_close,
3811 .fault = snd_pcm_mmap_data_fault,
3812};
3813
3814/*
3815 * mmap the DMA buffer on RAM
3816 */
3817
3818/**
3819 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3820 * @substream: PCM substream
3821 * @area: VMA
3822 *
3823 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3824 * this function is invoked implicitly.
3825 *
3826 * Return: zero if successful, or a negative error code
3827 */
3828int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3829 struct vm_area_struct *area)
3830{
3831 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3832 if (!substream->ops->page &&
3833 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3834 return 0;
3835 /* mmap with fault handler */
3836 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3837 return 0;
3838}
3839EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3840
3841/*
3842 * mmap the DMA buffer on I/O memory area
3843 */
3844#if SNDRV_PCM_INFO_MMAP_IOMEM
3845/**
3846 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3847 * @substream: PCM substream
3848 * @area: VMA
3849 *
3850 * When your hardware uses the iomapped pages as the hardware buffer and
3851 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3852 * is supposed to work only on limited architectures.
3853 *
3854 * Return: zero if successful, or a negative error code
3855 */
3856int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3857 struct vm_area_struct *area)
3858{
3859 struct snd_pcm_runtime *runtime = substream->runtime;
3860
3861 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3862 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3863}
3864EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3865#endif /* SNDRV_PCM_INFO_MMAP */
3866
3867/*
3868 * mmap DMA buffer
3869 */
3870int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3871 struct vm_area_struct *area)
3872{
3873 struct snd_pcm_runtime *runtime;
3874 long size;
3875 unsigned long offset;
3876 size_t dma_bytes;
3877 int err;
3878
3879 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3880 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3881 return -EINVAL;
3882 } else {
3883 if (!(area->vm_flags & VM_READ))
3884 return -EINVAL;
3885 }
3886 runtime = substream->runtime;
3887 if (runtime->state == SNDRV_PCM_STATE_OPEN)
3888 return -EBADFD;
3889 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3890 return -ENXIO;
3891 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3892 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3893 return -EINVAL;
3894 size = area->vm_end - area->vm_start;
3895 offset = area->vm_pgoff << PAGE_SHIFT;
3896 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3897 if ((size_t)size > dma_bytes)
3898 return -EINVAL;
3899 if (offset > dma_bytes - size)
3900 return -EINVAL;
3901
3902 area->vm_ops = &snd_pcm_vm_ops_data;
3903 area->vm_private_data = substream;
3904 if (substream->ops->mmap)
3905 err = substream->ops->mmap(substream, area);
3906 else
3907 err = snd_pcm_lib_default_mmap(substream, area);
3908 if (!err)
3909 atomic_inc(&substream->mmap_count);
3910 return err;
3911}
3912EXPORT_SYMBOL(snd_pcm_mmap_data);
3913
3914static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3915{
3916 struct snd_pcm_file * pcm_file;
3917 struct snd_pcm_substream *substream;
3918 unsigned long offset;
3919
3920 pcm_file = file->private_data;
3921 substream = pcm_file->substream;
3922 if (PCM_RUNTIME_CHECK(substream))
3923 return -ENXIO;
3924 if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3925 return -EBADFD;
3926
3927 offset = area->vm_pgoff << PAGE_SHIFT;
3928 switch (offset) {
3929 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3930 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3931 return -ENXIO;
3932 fallthrough;
3933 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3934 if (!pcm_status_mmap_allowed(pcm_file))
3935 return -ENXIO;
3936 return snd_pcm_mmap_status(substream, file, area);
3937 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3938 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3939 return -ENXIO;
3940 fallthrough;
3941 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3942 if (!pcm_control_mmap_allowed(pcm_file))
3943 return -ENXIO;
3944 return snd_pcm_mmap_control(substream, file, area);
3945 default:
3946 return snd_pcm_mmap_data(substream, file, area);
3947 }
3948 return 0;
3949}
3950
3951static int snd_pcm_fasync(int fd, struct file * file, int on)
3952{
3953 struct snd_pcm_file * pcm_file;
3954 struct snd_pcm_substream *substream;
3955 struct snd_pcm_runtime *runtime;
3956
3957 pcm_file = file->private_data;
3958 substream = pcm_file->substream;
3959 if (PCM_RUNTIME_CHECK(substream))
3960 return -ENXIO;
3961 runtime = substream->runtime;
3962 if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
3963 return -EBADFD;
3964 return snd_fasync_helper(fd, file, on, &runtime->fasync);
3965}
3966
3967/*
3968 * ioctl32 compat
3969 */
3970#ifdef CONFIG_COMPAT
3971#include "pcm_compat.c"
3972#else
3973#define snd_pcm_ioctl_compat NULL
3974#endif
3975
3976/*
3977 * To be removed helpers to keep binary compatibility
3978 */
3979
3980#ifdef CONFIG_SND_SUPPORT_OLD_API
3981#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3982#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3983
3984static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3985 struct snd_pcm_hw_params_old *oparams)
3986{
3987 unsigned int i;
3988
3989 memset(params, 0, sizeof(*params));
3990 params->flags = oparams->flags;
3991 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3992 params->masks[i].bits[0] = oparams->masks[i];
3993 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3994 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3995 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3996 params->info = oparams->info;
3997 params->msbits = oparams->msbits;
3998 params->rate_num = oparams->rate_num;
3999 params->rate_den = oparams->rate_den;
4000 params->fifo_size = oparams->fifo_size;
4001}
4002
4003static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
4004 struct snd_pcm_hw_params *params)
4005{
4006 unsigned int i;
4007
4008 memset(oparams, 0, sizeof(*oparams));
4009 oparams->flags = params->flags;
4010 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
4011 oparams->masks[i] = params->masks[i].bits[0];
4012 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
4013 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
4014 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
4015 oparams->info = params->info;
4016 oparams->msbits = params->msbits;
4017 oparams->rate_num = params->rate_num;
4018 oparams->rate_den = params->rate_den;
4019 oparams->fifo_size = params->fifo_size;
4020}
4021
4022static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4023 struct snd_pcm_hw_params_old __user * _oparams)
4024{
4025 struct snd_pcm_hw_params *params;
4026 struct snd_pcm_hw_params_old *oparams = NULL;
4027 int err;
4028
4029 params = kmalloc(sizeof(*params), GFP_KERNEL);
4030 if (!params)
4031 return -ENOMEM;
4032
4033 oparams = memdup_user(_oparams, sizeof(*oparams));
4034 if (IS_ERR(oparams)) {
4035 err = PTR_ERR(oparams);
4036 goto out;
4037 }
4038 snd_pcm_hw_convert_from_old_params(params, oparams);
4039 err = snd_pcm_hw_refine(substream, params);
4040 if (err < 0)
4041 goto out_old;
4042
4043 err = fixup_unreferenced_params(substream, params);
4044 if (err < 0)
4045 goto out_old;
4046
4047 snd_pcm_hw_convert_to_old_params(oparams, params);
4048 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4049 err = -EFAULT;
4050out_old:
4051 kfree(oparams);
4052out:
4053 kfree(params);
4054 return err;
4055}
4056
4057static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4058 struct snd_pcm_hw_params_old __user * _oparams)
4059{
4060 struct snd_pcm_hw_params *params;
4061 struct snd_pcm_hw_params_old *oparams = NULL;
4062 int err;
4063
4064 params = kmalloc(sizeof(*params), GFP_KERNEL);
4065 if (!params)
4066 return -ENOMEM;
4067
4068 oparams = memdup_user(_oparams, sizeof(*oparams));
4069 if (IS_ERR(oparams)) {
4070 err = PTR_ERR(oparams);
4071 goto out;
4072 }
4073
4074 snd_pcm_hw_convert_from_old_params(params, oparams);
4075 err = snd_pcm_hw_params(substream, params);
4076 if (err < 0)
4077 goto out_old;
4078
4079 snd_pcm_hw_convert_to_old_params(oparams, params);
4080 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4081 err = -EFAULT;
4082out_old:
4083 kfree(oparams);
4084out:
4085 kfree(params);
4086 return err;
4087}
4088#endif /* CONFIG_SND_SUPPORT_OLD_API */
4089
4090#ifndef CONFIG_MMU
4091static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4092 unsigned long addr,
4093 unsigned long len,
4094 unsigned long pgoff,
4095 unsigned long flags)
4096{
4097 struct snd_pcm_file *pcm_file = file->private_data;
4098 struct snd_pcm_substream *substream = pcm_file->substream;
4099 struct snd_pcm_runtime *runtime = substream->runtime;
4100 unsigned long offset = pgoff << PAGE_SHIFT;
4101
4102 switch (offset) {
4103 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4104 return (unsigned long)runtime->status;
4105 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4106 return (unsigned long)runtime->control;
4107 default:
4108 return (unsigned long)runtime->dma_area + offset;
4109 }
4110}
4111#else
4112# define snd_pcm_get_unmapped_area NULL
4113#endif
4114
4115/*
4116 * Register section
4117 */
4118
4119const struct file_operations snd_pcm_f_ops[2] = {
4120 {
4121 .owner = THIS_MODULE,
4122 .write = snd_pcm_write,
4123 .write_iter = snd_pcm_writev,
4124 .open = snd_pcm_playback_open,
4125 .release = snd_pcm_release,
4126 .llseek = no_llseek,
4127 .poll = snd_pcm_poll,
4128 .unlocked_ioctl = snd_pcm_ioctl,
4129 .compat_ioctl = snd_pcm_ioctl_compat,
4130 .mmap = snd_pcm_mmap,
4131 .fasync = snd_pcm_fasync,
4132 .get_unmapped_area = snd_pcm_get_unmapped_area,
4133 },
4134 {
4135 .owner = THIS_MODULE,
4136 .read = snd_pcm_read,
4137 .read_iter = snd_pcm_readv,
4138 .open = snd_pcm_capture_open,
4139 .release = snd_pcm_release,
4140 .llseek = no_llseek,
4141 .poll = snd_pcm_poll,
4142 .unlocked_ioctl = snd_pcm_ioctl,
4143 .compat_ioctl = snd_pcm_ioctl_compat,
4144 .mmap = snd_pcm_mmap,
4145 .fasync = snd_pcm_fasync,
4146 .get_unmapped_area = snd_pcm_get_unmapped_area,
4147 }
4148};