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
44 struct 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
64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
65 struct snd_pcm_hw_params_old __user * _oparams);
66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
67 struct snd_pcm_hw_params_old __user * _oparams);
68 #endif
69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
70
71 /*
72 *
73 */
74
75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
76
snd_pcm_group_init(struct snd_pcm_group * group)77 void 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) \
87 static 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
95 DEFINE_PCM_GROUP_LOCK(lock, lock);
96 DEFINE_PCM_GROUP_LOCK(unlock, unlock);
97 DEFINE_PCM_GROUP_LOCK(lock_irq, lock);
98 DEFINE_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 */
snd_pcm_stream_lock(struct snd_pcm_substream * substream)108 void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
109 {
110 snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic);
111 }
112 EXPORT_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 */
snd_pcm_stream_unlock(struct snd_pcm_substream * substream)120 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
121 {
122 snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic);
123 }
124 EXPORT_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 */
snd_pcm_stream_lock_irq(struct snd_pcm_substream * substream)134 void 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 }
139 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
140
snd_pcm_stream_lock_nested(struct snd_pcm_substream * substream)141 static 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 */
snd_pcm_stream_unlock_irq(struct snd_pcm_substream * substream)157 void 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 }
162 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
163
_snd_pcm_stream_lock_irqsave(struct snd_pcm_substream * substream)164 unsigned 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 }
173 EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave);
174
_snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream * substream)175 unsigned 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 }
186 EXPORT_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 */
snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream * substream,unsigned long flags)195 void 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 }
203 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
204
205 /* Run PCM ioctl ops */
snd_pcm_ops_ioctl(struct snd_pcm_substream * substream,unsigned cmd,void * arg)206 static 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
snd_pcm_info(struct snd_pcm_substream * substream,struct snd_pcm_info * info)215 int 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
snd_pcm_info_user(struct snd_pcm_substream * substream,struct snd_pcm_info __user * _info)236 int 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
hw_support_mmap(struct snd_pcm_substream * substream)257 static 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
constrain_mask_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)284 static 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;
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
constrain_interval_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)320 static 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;
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
constrain_params_by_rules(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)356 static 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;
368 struct snd_interval old_interval;
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;
396 retry:
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
fixup_unreferenced_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)477 static 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
snd_pcm_hw_refine(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)522 int 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 }
552 EXPORT_SYMBOL(snd_pcm_hw_refine);
553
snd_pcm_hw_refine_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)554 static 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;
574 end:
575 kfree(params);
576 return err;
577 }
578
period_to_usecs(struct snd_pcm_runtime * runtime)579 static 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
snd_pcm_set_state(struct snd_pcm_substream * substream,snd_pcm_state_t state)594 static 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->status->state != SNDRV_PCM_STATE_DISCONNECTED)
599 substream->runtime->status->state = state;
600 snd_pcm_stream_unlock_irq(substream);
601 }
602
snd_pcm_timer_notify(struct snd_pcm_substream * substream,int event)603 static 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
snd_pcm_sync_stop(struct snd_pcm_substream * substream,bool sync_irq)613 void 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 */
snd_pcm_hw_params_choose(struct snd_pcm_substream * pcm,struct snd_pcm_hw_params * params)636 static 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;
652 struct snd_interval old_interval;
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 */
snd_pcm_buffer_access_lock(struct snd_pcm_runtime * runtime)691 static 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 */
snd_pcm_buffer_access_unlock(struct snd_pcm_runtime * runtime)700 static 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
snd_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)712 static 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->status->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
snd_pcm_hw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params __user * _params)847 static 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;
863 end:
864 kfree(params);
865 return err;
866 }
867
do_hw_free(struct snd_pcm_substream * substream)868 static 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
snd_pcm_hw_free(struct snd_pcm_substream * substream)880 static 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->status->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
snd_pcm_sw_params(struct snd_pcm_substream * substream,struct snd_pcm_sw_params * params)913 static 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->status->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
snd_pcm_sw_params_user(struct snd_pcm_substream * substream,struct snd_pcm_sw_params __user * _params)968 static 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
981 static inline snd_pcm_uframes_t
snd_pcm_calc_delay(struct snd_pcm_substream * substream)982 snd_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
snd_pcm_status64(struct snd_pcm_substream * substream,struct snd_pcm_status64 * status)993 int 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->status->state;
1017 status->suspended_state = runtime->status->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
snd_pcm_status_user64(struct snd_pcm_substream * substream,struct snd_pcm_status64 __user * _status,bool ext)1069 static 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
snd_pcm_status_user32(struct snd_pcm_substream * substream,struct snd_pcm_status32 __user * _status,bool ext)1093 static 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
snd_pcm_channel_info(struct snd_pcm_substream * substream,struct snd_pcm_channel_info * info)1142 static 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->status->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
snd_pcm_channel_info_user(struct snd_pcm_substream * substream,struct snd_pcm_channel_info __user * _info)1163 static 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
snd_pcm_trigger_tstamp(struct snd_pcm_substream * substream)1179 static 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
1196 struct 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 */
snd_pcm_action_group(const struct action_ops * ops,struct snd_pcm_substream * substream,snd_pcm_state_t state,bool stream_lock)1212 static 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 */
snd_pcm_action_single(const struct action_ops * ops,struct snd_pcm_substream * substream,snd_pcm_state_t state)1272 static 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
snd_pcm_group_assign(struct snd_pcm_substream * substream,struct snd_pcm_group * new_group)1289 static 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 */
snd_pcm_group_unref(struct snd_pcm_group * group,struct snd_pcm_substream * substream)1300 static 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 */
1317 static struct snd_pcm_group *
snd_pcm_stream_group_ref(struct snd_pcm_substream * substream)1318 snd_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 */
snd_pcm_action(const struct action_ops * ops,struct snd_pcm_substream * substream,snd_pcm_state_t state)1353 static 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 */
snd_pcm_action_lock_irq(const struct action_ops * ops,struct snd_pcm_substream * substream,snd_pcm_state_t state)1372 static 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 */
snd_pcm_action_nonatomic(const struct action_ops * ops,struct snd_pcm_substream * substream,snd_pcm_state_t state)1386 static 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 */
snd_pcm_pre_start(struct snd_pcm_substream * substream,snd_pcm_state_t state)1410 static 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->status->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
snd_pcm_do_start(struct snd_pcm_substream * substream,snd_pcm_state_t state)1424 static int snd_pcm_do_start(struct snd_pcm_substream *substream,
1425 snd_pcm_state_t state)
1426 {
1427 if (substream->runtime->trigger_master != substream)
1428 return 0;
1429 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
1430 }
1431
snd_pcm_undo_start(struct snd_pcm_substream * substream,snd_pcm_state_t state)1432 static void snd_pcm_undo_start(struct snd_pcm_substream *substream,
1433 snd_pcm_state_t state)
1434 {
1435 if (substream->runtime->trigger_master == substream)
1436 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1437 }
1438
snd_pcm_post_start(struct snd_pcm_substream * substream,snd_pcm_state_t state)1439 static void snd_pcm_post_start(struct snd_pcm_substream *substream,
1440 snd_pcm_state_t state)
1441 {
1442 struct snd_pcm_runtime *runtime = substream->runtime;
1443 snd_pcm_trigger_tstamp(substream);
1444 runtime->hw_ptr_jiffies = jiffies;
1445 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
1446 runtime->rate;
1447 runtime->status->state = state;
1448 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1449 runtime->silence_size > 0)
1450 snd_pcm_playback_silence(substream, ULONG_MAX);
1451 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART);
1452 }
1453
1454 static const struct action_ops snd_pcm_action_start = {
1455 .pre_action = snd_pcm_pre_start,
1456 .do_action = snd_pcm_do_start,
1457 .undo_action = snd_pcm_undo_start,
1458 .post_action = snd_pcm_post_start
1459 };
1460
1461 /**
1462 * snd_pcm_start - start all linked streams
1463 * @substream: the PCM substream instance
1464 *
1465 * Return: Zero if successful, or a negative error code.
1466 * The stream lock must be acquired before calling this function.
1467 */
snd_pcm_start(struct snd_pcm_substream * substream)1468 int snd_pcm_start(struct snd_pcm_substream *substream)
1469 {
1470 return snd_pcm_action(&snd_pcm_action_start, substream,
1471 SNDRV_PCM_STATE_RUNNING);
1472 }
1473
1474 /* take the stream lock and start the streams */
snd_pcm_start_lock_irq(struct snd_pcm_substream * substream)1475 static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream)
1476 {
1477 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream,
1478 SNDRV_PCM_STATE_RUNNING);
1479 }
1480
1481 /*
1482 * stop callbacks
1483 */
snd_pcm_pre_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1484 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream,
1485 snd_pcm_state_t state)
1486 {
1487 struct snd_pcm_runtime *runtime = substream->runtime;
1488 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1489 return -EBADFD;
1490 runtime->trigger_master = substream;
1491 return 0;
1492 }
1493
snd_pcm_do_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1494 static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
1495 snd_pcm_state_t state)
1496 {
1497 if (substream->runtime->trigger_master == substream &&
1498 snd_pcm_running(substream)) {
1499 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
1500 substream->runtime->stop_operating = true;
1501 }
1502 return 0; /* unconditionally stop all substreams */
1503 }
1504
snd_pcm_post_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1505 static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
1506 snd_pcm_state_t state)
1507 {
1508 struct snd_pcm_runtime *runtime = substream->runtime;
1509 if (runtime->status->state != state) {
1510 snd_pcm_trigger_tstamp(substream);
1511 runtime->status->state = state;
1512 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
1513 }
1514 wake_up(&runtime->sleep);
1515 wake_up(&runtime->tsleep);
1516 }
1517
1518 static const struct action_ops snd_pcm_action_stop = {
1519 .pre_action = snd_pcm_pre_stop,
1520 .do_action = snd_pcm_do_stop,
1521 .post_action = snd_pcm_post_stop
1522 };
1523
1524 /**
1525 * snd_pcm_stop - try to stop all running streams in the substream group
1526 * @substream: the PCM substream instance
1527 * @state: PCM state after stopping the stream
1528 *
1529 * The state of each stream is then changed to the given state unconditionally.
1530 *
1531 * Return: Zero if successful, or a negative error code.
1532 */
snd_pcm_stop(struct snd_pcm_substream * substream,snd_pcm_state_t state)1533 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
1534 {
1535 return snd_pcm_action(&snd_pcm_action_stop, substream, state);
1536 }
1537 EXPORT_SYMBOL(snd_pcm_stop);
1538
1539 /**
1540 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
1541 * @substream: the PCM substream
1542 *
1543 * After stopping, the state is changed to SETUP.
1544 * Unlike snd_pcm_stop(), this affects only the given stream.
1545 *
1546 * Return: Zero if successful, or a negative error code.
1547 */
snd_pcm_drain_done(struct snd_pcm_substream * substream)1548 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
1549 {
1550 return snd_pcm_action_single(&snd_pcm_action_stop, substream,
1551 SNDRV_PCM_STATE_SETUP);
1552 }
1553
1554 /**
1555 * snd_pcm_stop_xrun - stop the running streams as XRUN
1556 * @substream: the PCM substream instance
1557 *
1558 * This stops the given running substream (and all linked substreams) as XRUN.
1559 * Unlike snd_pcm_stop(), this function takes the substream lock by itself.
1560 *
1561 * Return: Zero if successful, or a negative error code.
1562 */
snd_pcm_stop_xrun(struct snd_pcm_substream * substream)1563 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream)
1564 {
1565 unsigned long flags;
1566
1567 snd_pcm_stream_lock_irqsave(substream, flags);
1568 if (substream->runtime && snd_pcm_running(substream))
1569 __snd_pcm_xrun(substream);
1570 snd_pcm_stream_unlock_irqrestore(substream, flags);
1571 return 0;
1572 }
1573 EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun);
1574
1575 /*
1576 * pause callbacks: pass boolean (to start pause or resume) as state argument
1577 */
1578 #define pause_pushed(state) (__force bool)(state)
1579
snd_pcm_pre_pause(struct snd_pcm_substream * substream,snd_pcm_state_t state)1580 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
1581 snd_pcm_state_t state)
1582 {
1583 struct snd_pcm_runtime *runtime = substream->runtime;
1584 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1585 return -ENOSYS;
1586 if (pause_pushed(state)) {
1587 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1588 return -EBADFD;
1589 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1590 return -EBADFD;
1591 runtime->trigger_master = substream;
1592 return 0;
1593 }
1594
snd_pcm_do_pause(struct snd_pcm_substream * substream,snd_pcm_state_t state)1595 static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
1596 snd_pcm_state_t state)
1597 {
1598 if (substream->runtime->trigger_master != substream)
1599 return 0;
1600 /* some drivers might use hw_ptr to recover from the pause -
1601 update the hw_ptr now */
1602 if (pause_pushed(state))
1603 snd_pcm_update_hw_ptr(substream);
1604 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1605 * a delta between the current jiffies, this gives a large enough
1606 * delta, effectively to skip the check once.
1607 */
1608 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1609 return substream->ops->trigger(substream,
1610 pause_pushed(state) ?
1611 SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1612 SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1613 }
1614
snd_pcm_undo_pause(struct snd_pcm_substream * substream,snd_pcm_state_t state)1615 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
1616 snd_pcm_state_t state)
1617 {
1618 if (substream->runtime->trigger_master == substream)
1619 substream->ops->trigger(substream,
1620 pause_pushed(state) ?
1621 SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1622 SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1623 }
1624
snd_pcm_post_pause(struct snd_pcm_substream * substream,snd_pcm_state_t state)1625 static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
1626 snd_pcm_state_t state)
1627 {
1628 struct snd_pcm_runtime *runtime = substream->runtime;
1629 snd_pcm_trigger_tstamp(substream);
1630 if (pause_pushed(state)) {
1631 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1632 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
1633 wake_up(&runtime->sleep);
1634 wake_up(&runtime->tsleep);
1635 } else {
1636 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1637 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE);
1638 }
1639 }
1640
1641 static const struct action_ops snd_pcm_action_pause = {
1642 .pre_action = snd_pcm_pre_pause,
1643 .do_action = snd_pcm_do_pause,
1644 .undo_action = snd_pcm_undo_pause,
1645 .post_action = snd_pcm_post_pause
1646 };
1647
1648 /*
1649 * Push/release the pause for all linked streams.
1650 */
snd_pcm_pause(struct snd_pcm_substream * substream,bool push)1651 static int snd_pcm_pause(struct snd_pcm_substream *substream, bool push)
1652 {
1653 return snd_pcm_action(&snd_pcm_action_pause, substream,
1654 (__force snd_pcm_state_t)push);
1655 }
1656
snd_pcm_pause_lock_irq(struct snd_pcm_substream * substream,bool push)1657 static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
1658 bool push)
1659 {
1660 return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
1661 (__force snd_pcm_state_t)push);
1662 }
1663
1664 #ifdef CONFIG_PM
1665 /* suspend callback: state argument ignored */
1666
snd_pcm_pre_suspend(struct snd_pcm_substream * substream,snd_pcm_state_t state)1667 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
1668 snd_pcm_state_t state)
1669 {
1670 struct snd_pcm_runtime *runtime = substream->runtime;
1671 switch (runtime->status->state) {
1672 case SNDRV_PCM_STATE_SUSPENDED:
1673 return -EBUSY;
1674 /* unresumable PCM state; return -EBUSY for skipping suspend */
1675 case SNDRV_PCM_STATE_OPEN:
1676 case SNDRV_PCM_STATE_SETUP:
1677 case SNDRV_PCM_STATE_DISCONNECTED:
1678 return -EBUSY;
1679 }
1680 runtime->trigger_master = substream;
1681 return 0;
1682 }
1683
snd_pcm_do_suspend(struct snd_pcm_substream * substream,snd_pcm_state_t state)1684 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
1685 snd_pcm_state_t state)
1686 {
1687 struct snd_pcm_runtime *runtime = substream->runtime;
1688 if (runtime->trigger_master != substream)
1689 return 0;
1690 if (! snd_pcm_running(substream))
1691 return 0;
1692 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1693 runtime->stop_operating = true;
1694 return 0; /* suspend unconditionally */
1695 }
1696
snd_pcm_post_suspend(struct snd_pcm_substream * substream,snd_pcm_state_t state)1697 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
1698 snd_pcm_state_t state)
1699 {
1700 struct snd_pcm_runtime *runtime = substream->runtime;
1701 snd_pcm_trigger_tstamp(substream);
1702 runtime->status->suspended_state = runtime->status->state;
1703 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1704 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND);
1705 wake_up(&runtime->sleep);
1706 wake_up(&runtime->tsleep);
1707 }
1708
1709 static const struct action_ops snd_pcm_action_suspend = {
1710 .pre_action = snd_pcm_pre_suspend,
1711 .do_action = snd_pcm_do_suspend,
1712 .post_action = snd_pcm_post_suspend
1713 };
1714
1715 /*
1716 * snd_pcm_suspend - trigger SUSPEND to all linked streams
1717 * @substream: the PCM substream
1718 *
1719 * After this call, all streams are changed to SUSPENDED state.
1720 *
1721 * Return: Zero if successful, or a negative error code.
1722 */
snd_pcm_suspend(struct snd_pcm_substream * substream)1723 static int snd_pcm_suspend(struct snd_pcm_substream *substream)
1724 {
1725 int err;
1726 unsigned long flags;
1727
1728 snd_pcm_stream_lock_irqsave(substream, flags);
1729 err = snd_pcm_action(&snd_pcm_action_suspend, substream,
1730 ACTION_ARG_IGNORE);
1731 snd_pcm_stream_unlock_irqrestore(substream, flags);
1732 return err;
1733 }
1734
1735 /**
1736 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1737 * @pcm: the PCM instance
1738 *
1739 * After this call, all streams are changed to SUSPENDED state.
1740 *
1741 * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1742 */
snd_pcm_suspend_all(struct snd_pcm * pcm)1743 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1744 {
1745 struct snd_pcm_substream *substream;
1746 int stream, err = 0;
1747
1748 if (! pcm)
1749 return 0;
1750
1751 for_each_pcm_substream(pcm, stream, substream) {
1752 /* FIXME: the open/close code should lock this as well */
1753 if (!substream->runtime)
1754 continue;
1755
1756 /*
1757 * Skip BE dai link PCM's that are internal and may
1758 * not have their substream ops set.
1759 */
1760 if (!substream->ops)
1761 continue;
1762
1763 err = snd_pcm_suspend(substream);
1764 if (err < 0 && err != -EBUSY)
1765 return err;
1766 }
1767
1768 for_each_pcm_substream(pcm, stream, substream)
1769 snd_pcm_sync_stop(substream, false);
1770
1771 return 0;
1772 }
1773 EXPORT_SYMBOL(snd_pcm_suspend_all);
1774
1775 /* resume callbacks: state argument ignored */
1776
snd_pcm_pre_resume(struct snd_pcm_substream * substream,snd_pcm_state_t state)1777 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
1778 snd_pcm_state_t state)
1779 {
1780 struct snd_pcm_runtime *runtime = substream->runtime;
1781 if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1782 return -ENOSYS;
1783 runtime->trigger_master = substream;
1784 return 0;
1785 }
1786
snd_pcm_do_resume(struct snd_pcm_substream * substream,snd_pcm_state_t state)1787 static int snd_pcm_do_resume(struct snd_pcm_substream *substream,
1788 snd_pcm_state_t state)
1789 {
1790 struct snd_pcm_runtime *runtime = substream->runtime;
1791 if (runtime->trigger_master != substream)
1792 return 0;
1793 /* DMA not running previously? */
1794 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1795 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1796 substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1797 return 0;
1798 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1799 }
1800
snd_pcm_undo_resume(struct snd_pcm_substream * substream,snd_pcm_state_t state)1801 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream,
1802 snd_pcm_state_t state)
1803 {
1804 if (substream->runtime->trigger_master == substream &&
1805 snd_pcm_running(substream))
1806 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1807 }
1808
snd_pcm_post_resume(struct snd_pcm_substream * substream,snd_pcm_state_t state)1809 static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
1810 snd_pcm_state_t state)
1811 {
1812 struct snd_pcm_runtime *runtime = substream->runtime;
1813 snd_pcm_trigger_tstamp(substream);
1814 runtime->status->state = runtime->status->suspended_state;
1815 snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
1816 }
1817
1818 static const struct action_ops snd_pcm_action_resume = {
1819 .pre_action = snd_pcm_pre_resume,
1820 .do_action = snd_pcm_do_resume,
1821 .undo_action = snd_pcm_undo_resume,
1822 .post_action = snd_pcm_post_resume
1823 };
1824
snd_pcm_resume(struct snd_pcm_substream * substream)1825 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1826 {
1827 return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
1828 ACTION_ARG_IGNORE);
1829 }
1830
1831 #else
1832
snd_pcm_resume(struct snd_pcm_substream * substream)1833 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1834 {
1835 return -ENOSYS;
1836 }
1837
1838 #endif /* CONFIG_PM */
1839
1840 /*
1841 * xrun ioctl
1842 *
1843 * Change the RUNNING stream(s) to XRUN state.
1844 */
snd_pcm_xrun(struct snd_pcm_substream * substream)1845 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1846 {
1847 struct snd_pcm_runtime *runtime = substream->runtime;
1848 int result;
1849
1850 snd_pcm_stream_lock_irq(substream);
1851 switch (runtime->status->state) {
1852 case SNDRV_PCM_STATE_XRUN:
1853 result = 0; /* already there */
1854 break;
1855 case SNDRV_PCM_STATE_RUNNING:
1856 __snd_pcm_xrun(substream);
1857 result = 0;
1858 break;
1859 default:
1860 result = -EBADFD;
1861 }
1862 snd_pcm_stream_unlock_irq(substream);
1863 return result;
1864 }
1865
1866 /*
1867 * reset ioctl
1868 */
1869 /* reset callbacks: state argument ignored */
snd_pcm_pre_reset(struct snd_pcm_substream * substream,snd_pcm_state_t state)1870 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
1871 snd_pcm_state_t state)
1872 {
1873 struct snd_pcm_runtime *runtime = substream->runtime;
1874 switch (runtime->status->state) {
1875 case SNDRV_PCM_STATE_RUNNING:
1876 case SNDRV_PCM_STATE_PREPARED:
1877 case SNDRV_PCM_STATE_PAUSED:
1878 case SNDRV_PCM_STATE_SUSPENDED:
1879 return 0;
1880 default:
1881 return -EBADFD;
1882 }
1883 }
1884
snd_pcm_do_reset(struct snd_pcm_substream * substream,snd_pcm_state_t state)1885 static int snd_pcm_do_reset(struct snd_pcm_substream *substream,
1886 snd_pcm_state_t state)
1887 {
1888 struct snd_pcm_runtime *runtime = substream->runtime;
1889 int err = snd_pcm_ops_ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1890 if (err < 0)
1891 return err;
1892 snd_pcm_stream_lock_irq(substream);
1893 runtime->hw_ptr_base = 0;
1894 runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1895 runtime->status->hw_ptr % runtime->period_size;
1896 runtime->silence_start = runtime->status->hw_ptr;
1897 runtime->silence_filled = 0;
1898 snd_pcm_stream_unlock_irq(substream);
1899 return 0;
1900 }
1901
snd_pcm_post_reset(struct snd_pcm_substream * substream,snd_pcm_state_t state)1902 static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
1903 snd_pcm_state_t state)
1904 {
1905 struct snd_pcm_runtime *runtime = substream->runtime;
1906 snd_pcm_stream_lock_irq(substream);
1907 runtime->control->appl_ptr = runtime->status->hw_ptr;
1908 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1909 runtime->silence_size > 0)
1910 snd_pcm_playback_silence(substream, ULONG_MAX);
1911 snd_pcm_stream_unlock_irq(substream);
1912 }
1913
1914 static const struct action_ops snd_pcm_action_reset = {
1915 .pre_action = snd_pcm_pre_reset,
1916 .do_action = snd_pcm_do_reset,
1917 .post_action = snd_pcm_post_reset
1918 };
1919
snd_pcm_reset(struct snd_pcm_substream * substream)1920 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1921 {
1922 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream,
1923 ACTION_ARG_IGNORE);
1924 }
1925
1926 /*
1927 * prepare ioctl
1928 */
1929 /* pass f_flags as state argument */
snd_pcm_pre_prepare(struct snd_pcm_substream * substream,snd_pcm_state_t state)1930 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1931 snd_pcm_state_t state)
1932 {
1933 struct snd_pcm_runtime *runtime = substream->runtime;
1934 int f_flags = (__force int)state;
1935
1936 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1937 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1938 return -EBADFD;
1939 if (snd_pcm_running(substream))
1940 return -EBUSY;
1941 substream->f_flags = f_flags;
1942 return 0;
1943 }
1944
snd_pcm_do_prepare(struct snd_pcm_substream * substream,snd_pcm_state_t state)1945 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream,
1946 snd_pcm_state_t state)
1947 {
1948 int err;
1949 snd_pcm_sync_stop(substream, true);
1950 err = substream->ops->prepare(substream);
1951 if (err < 0)
1952 return err;
1953 return snd_pcm_do_reset(substream, state);
1954 }
1955
snd_pcm_post_prepare(struct snd_pcm_substream * substream,snd_pcm_state_t state)1956 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
1957 snd_pcm_state_t state)
1958 {
1959 struct snd_pcm_runtime *runtime = substream->runtime;
1960 runtime->control->appl_ptr = runtime->status->hw_ptr;
1961 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1962 }
1963
1964 static const struct action_ops snd_pcm_action_prepare = {
1965 .pre_action = snd_pcm_pre_prepare,
1966 .do_action = snd_pcm_do_prepare,
1967 .post_action = snd_pcm_post_prepare
1968 };
1969
1970 /**
1971 * snd_pcm_prepare - prepare the PCM substream to be triggerable
1972 * @substream: the PCM substream instance
1973 * @file: file to refer f_flags
1974 *
1975 * Return: Zero if successful, or a negative error code.
1976 */
snd_pcm_prepare(struct snd_pcm_substream * substream,struct file * file)1977 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1978 struct file *file)
1979 {
1980 int f_flags;
1981
1982 if (file)
1983 f_flags = file->f_flags;
1984 else
1985 f_flags = substream->f_flags;
1986
1987 snd_pcm_stream_lock_irq(substream);
1988 switch (substream->runtime->status->state) {
1989 case SNDRV_PCM_STATE_PAUSED:
1990 snd_pcm_pause(substream, false);
1991 fallthrough;
1992 case SNDRV_PCM_STATE_SUSPENDED:
1993 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1994 break;
1995 }
1996 snd_pcm_stream_unlock_irq(substream);
1997
1998 return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1999 substream,
2000 (__force snd_pcm_state_t)f_flags);
2001 }
2002
2003 /*
2004 * drain ioctl
2005 */
2006
2007 /* drain init callbacks: state argument ignored */
snd_pcm_pre_drain_init(struct snd_pcm_substream * substream,snd_pcm_state_t state)2008 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
2009 snd_pcm_state_t state)
2010 {
2011 struct snd_pcm_runtime *runtime = substream->runtime;
2012 switch (runtime->status->state) {
2013 case SNDRV_PCM_STATE_OPEN:
2014 case SNDRV_PCM_STATE_DISCONNECTED:
2015 case SNDRV_PCM_STATE_SUSPENDED:
2016 return -EBADFD;
2017 }
2018 runtime->trigger_master = substream;
2019 return 0;
2020 }
2021
snd_pcm_do_drain_init(struct snd_pcm_substream * substream,snd_pcm_state_t state)2022 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream,
2023 snd_pcm_state_t state)
2024 {
2025 struct snd_pcm_runtime *runtime = substream->runtime;
2026 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2027 switch (runtime->status->state) {
2028 case SNDRV_PCM_STATE_PREPARED:
2029 /* start playback stream if possible */
2030 if (! snd_pcm_playback_empty(substream)) {
2031 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
2032 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
2033 } else {
2034 runtime->status->state = SNDRV_PCM_STATE_SETUP;
2035 }
2036 break;
2037 case SNDRV_PCM_STATE_RUNNING:
2038 runtime->status->state = SNDRV_PCM_STATE_DRAINING;
2039 break;
2040 case SNDRV_PCM_STATE_XRUN:
2041 runtime->status->state = SNDRV_PCM_STATE_SETUP;
2042 break;
2043 default:
2044 break;
2045 }
2046 } else {
2047 /* stop running stream */
2048 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
2049 snd_pcm_state_t new_state;
2050
2051 new_state = snd_pcm_capture_avail(runtime) > 0 ?
2052 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
2053 snd_pcm_do_stop(substream, new_state);
2054 snd_pcm_post_stop(substream, new_state);
2055 }
2056 }
2057
2058 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
2059 runtime->trigger_master == substream &&
2060 (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER))
2061 return substream->ops->trigger(substream,
2062 SNDRV_PCM_TRIGGER_DRAIN);
2063
2064 return 0;
2065 }
2066
snd_pcm_post_drain_init(struct snd_pcm_substream * substream,snd_pcm_state_t state)2067 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream,
2068 snd_pcm_state_t state)
2069 {
2070 }
2071
2072 static const struct action_ops snd_pcm_action_drain_init = {
2073 .pre_action = snd_pcm_pre_drain_init,
2074 .do_action = snd_pcm_do_drain_init,
2075 .post_action = snd_pcm_post_drain_init
2076 };
2077
2078 /*
2079 * Drain the stream(s).
2080 * When the substream is linked, sync until the draining of all playback streams
2081 * is finished.
2082 * After this call, all streams are supposed to be either SETUP or DRAINING
2083 * (capture only) state.
2084 */
snd_pcm_drain(struct snd_pcm_substream * substream,struct file * file)2085 static int snd_pcm_drain(struct snd_pcm_substream *substream,
2086 struct file *file)
2087 {
2088 struct snd_card *card;
2089 struct snd_pcm_runtime *runtime;
2090 struct snd_pcm_substream *s;
2091 struct snd_pcm_group *group;
2092 wait_queue_entry_t wait;
2093 int result = 0;
2094 int nonblock = 0;
2095
2096 card = substream->pcm->card;
2097 runtime = substream->runtime;
2098
2099 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2100 return -EBADFD;
2101
2102 if (file) {
2103 if (file->f_flags & O_NONBLOCK)
2104 nonblock = 1;
2105 } else if (substream->f_flags & O_NONBLOCK)
2106 nonblock = 1;
2107
2108 snd_pcm_stream_lock_irq(substream);
2109 /* resume pause */
2110 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
2111 snd_pcm_pause(substream, false);
2112
2113 /* pre-start/stop - all running streams are changed to DRAINING state */
2114 result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
2115 ACTION_ARG_IGNORE);
2116 if (result < 0)
2117 goto unlock;
2118 /* in non-blocking, we don't wait in ioctl but let caller poll */
2119 if (nonblock) {
2120 result = -EAGAIN;
2121 goto unlock;
2122 }
2123
2124 for (;;) {
2125 long tout;
2126 struct snd_pcm_runtime *to_check;
2127 if (signal_pending(current)) {
2128 result = -ERESTARTSYS;
2129 break;
2130 }
2131 /* find a substream to drain */
2132 to_check = NULL;
2133 group = snd_pcm_stream_group_ref(substream);
2134 snd_pcm_group_for_each_entry(s, substream) {
2135 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
2136 continue;
2137 runtime = s->runtime;
2138 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2139 to_check = runtime;
2140 break;
2141 }
2142 }
2143 snd_pcm_group_unref(group, substream);
2144 if (!to_check)
2145 break; /* all drained */
2146 init_waitqueue_entry(&wait, current);
2147 set_current_state(TASK_INTERRUPTIBLE);
2148 add_wait_queue(&to_check->sleep, &wait);
2149 snd_pcm_stream_unlock_irq(substream);
2150 if (runtime->no_period_wakeup)
2151 tout = MAX_SCHEDULE_TIMEOUT;
2152 else {
2153 tout = 10;
2154 if (runtime->rate) {
2155 long t = runtime->period_size * 2 / runtime->rate;
2156 tout = max(t, tout);
2157 }
2158 tout = msecs_to_jiffies(tout * 1000);
2159 }
2160 tout = schedule_timeout(tout);
2161
2162 snd_pcm_stream_lock_irq(substream);
2163 group = snd_pcm_stream_group_ref(substream);
2164 snd_pcm_group_for_each_entry(s, substream) {
2165 if (s->runtime == to_check) {
2166 remove_wait_queue(&to_check->sleep, &wait);
2167 break;
2168 }
2169 }
2170 snd_pcm_group_unref(group, substream);
2171
2172 if (card->shutdown) {
2173 result = -ENODEV;
2174 break;
2175 }
2176 if (tout == 0) {
2177 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
2178 result = -ESTRPIPE;
2179 else {
2180 dev_dbg(substream->pcm->card->dev,
2181 "playback drain error (DMA or IRQ trouble?)\n");
2182 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2183 result = -EIO;
2184 }
2185 break;
2186 }
2187 }
2188
2189 unlock:
2190 snd_pcm_stream_unlock_irq(substream);
2191
2192 return result;
2193 }
2194
2195 /*
2196 * drop ioctl
2197 *
2198 * Immediately put all linked substreams into SETUP state.
2199 */
snd_pcm_drop(struct snd_pcm_substream * substream)2200 static int snd_pcm_drop(struct snd_pcm_substream *substream)
2201 {
2202 struct snd_pcm_runtime *runtime;
2203 int result = 0;
2204
2205 if (PCM_RUNTIME_CHECK(substream))
2206 return -ENXIO;
2207 runtime = substream->runtime;
2208
2209 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2210 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
2211 return -EBADFD;
2212
2213 snd_pcm_stream_lock_irq(substream);
2214 /* resume pause */
2215 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
2216 snd_pcm_pause(substream, false);
2217
2218 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2219 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
2220 snd_pcm_stream_unlock_irq(substream);
2221
2222 return result;
2223 }
2224
2225
is_pcm_file(struct file * file)2226 static bool is_pcm_file(struct file *file)
2227 {
2228 struct inode *inode = file_inode(file);
2229 struct snd_pcm *pcm;
2230 unsigned int minor;
2231
2232 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
2233 return false;
2234 minor = iminor(inode);
2235 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2236 if (!pcm)
2237 pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2238 if (!pcm)
2239 return false;
2240 snd_card_unref(pcm->card);
2241 return true;
2242 }
2243
2244 /*
2245 * PCM link handling
2246 */
snd_pcm_link(struct snd_pcm_substream * substream,int fd)2247 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
2248 {
2249 int res = 0;
2250 struct snd_pcm_file *pcm_file;
2251 struct snd_pcm_substream *substream1;
2252 struct snd_pcm_group *group, *target_group;
2253 bool nonatomic = substream->pcm->nonatomic;
2254 struct fd f = fdget(fd);
2255
2256 if (!f.file)
2257 return -EBADFD;
2258 if (!is_pcm_file(f.file)) {
2259 res = -EBADFD;
2260 goto _badf;
2261 }
2262 pcm_file = f.file->private_data;
2263 substream1 = pcm_file->substream;
2264
2265 if (substream == substream1) {
2266 res = -EINVAL;
2267 goto _badf;
2268 }
2269
2270 group = kzalloc(sizeof(*group), GFP_KERNEL);
2271 if (!group) {
2272 res = -ENOMEM;
2273 goto _nolock;
2274 }
2275 snd_pcm_group_init(group);
2276
2277 down_write(&snd_pcm_link_rwsem);
2278 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
2279 substream->runtime->status->state != substream1->runtime->status->state ||
2280 substream->pcm->nonatomic != substream1->pcm->nonatomic) {
2281 res = -EBADFD;
2282 goto _end;
2283 }
2284 if (snd_pcm_stream_linked(substream1)) {
2285 res = -EALREADY;
2286 goto _end;
2287 }
2288
2289 snd_pcm_stream_lock_irq(substream);
2290 if (!snd_pcm_stream_linked(substream)) {
2291 snd_pcm_group_assign(substream, group);
2292 group = NULL; /* assigned, don't free this one below */
2293 }
2294 target_group = substream->group;
2295 snd_pcm_stream_unlock_irq(substream);
2296
2297 snd_pcm_group_lock_irq(target_group, nonatomic);
2298 snd_pcm_stream_lock_nested(substream1);
2299 snd_pcm_group_assign(substream1, target_group);
2300 refcount_inc(&target_group->refs);
2301 snd_pcm_stream_unlock(substream1);
2302 snd_pcm_group_unlock_irq(target_group, nonatomic);
2303 _end:
2304 up_write(&snd_pcm_link_rwsem);
2305 _nolock:
2306 kfree(group);
2307 _badf:
2308 fdput(f);
2309 return res;
2310 }
2311
relink_to_local(struct snd_pcm_substream * substream)2312 static void relink_to_local(struct snd_pcm_substream *substream)
2313 {
2314 snd_pcm_stream_lock_nested(substream);
2315 snd_pcm_group_assign(substream, &substream->self_group);
2316 snd_pcm_stream_unlock(substream);
2317 }
2318
snd_pcm_unlink(struct snd_pcm_substream * substream)2319 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
2320 {
2321 struct snd_pcm_group *group;
2322 bool nonatomic = substream->pcm->nonatomic;
2323 bool do_free = false;
2324 int res = 0;
2325
2326 down_write(&snd_pcm_link_rwsem);
2327
2328 if (!snd_pcm_stream_linked(substream)) {
2329 res = -EALREADY;
2330 goto _end;
2331 }
2332
2333 group = substream->group;
2334 snd_pcm_group_lock_irq(group, nonatomic);
2335
2336 relink_to_local(substream);
2337 refcount_dec(&group->refs);
2338
2339 /* detach the last stream, too */
2340 if (list_is_singular(&group->substreams)) {
2341 relink_to_local(list_first_entry(&group->substreams,
2342 struct snd_pcm_substream,
2343 link_list));
2344 do_free = refcount_dec_and_test(&group->refs);
2345 }
2346
2347 snd_pcm_group_unlock_irq(group, nonatomic);
2348 if (do_free)
2349 kfree(group);
2350
2351 _end:
2352 up_write(&snd_pcm_link_rwsem);
2353 return res;
2354 }
2355
2356 /*
2357 * hw configurator
2358 */
snd_pcm_hw_rule_mul(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2359 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
2360 struct snd_pcm_hw_rule *rule)
2361 {
2362 struct snd_interval t;
2363 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
2364 hw_param_interval_c(params, rule->deps[1]), &t);
2365 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2366 }
2367
snd_pcm_hw_rule_div(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2368 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
2369 struct snd_pcm_hw_rule *rule)
2370 {
2371 struct snd_interval t;
2372 snd_interval_div(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
snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2377 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
2378 struct snd_pcm_hw_rule *rule)
2379 {
2380 struct snd_interval t;
2381 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
2382 hw_param_interval_c(params, rule->deps[1]),
2383 (unsigned long) rule->private, &t);
2384 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2385 }
2386
snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2387 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
2388 struct snd_pcm_hw_rule *rule)
2389 {
2390 struct snd_interval t;
2391 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
2392 (unsigned long) rule->private,
2393 hw_param_interval_c(params, rule->deps[1]), &t);
2394 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2395 }
2396
snd_pcm_hw_rule_format(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2397 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
2398 struct snd_pcm_hw_rule *rule)
2399 {
2400 snd_pcm_format_t k;
2401 const struct snd_interval *i =
2402 hw_param_interval_c(params, rule->deps[0]);
2403 struct snd_mask m;
2404 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
2405 snd_mask_any(&m);
2406 pcm_for_each_format(k) {
2407 int bits;
2408 if (!snd_mask_test_format(mask, k))
2409 continue;
2410 bits = snd_pcm_format_physical_width(k);
2411 if (bits <= 0)
2412 continue; /* ignore invalid formats */
2413 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
2414 snd_mask_reset(&m, (__force unsigned)k);
2415 }
2416 return snd_mask_refine(mask, &m);
2417 }
2418
snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2419 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
2420 struct snd_pcm_hw_rule *rule)
2421 {
2422 struct snd_interval t;
2423 snd_pcm_format_t k;
2424
2425 t.min = UINT_MAX;
2426 t.max = 0;
2427 t.openmin = 0;
2428 t.openmax = 0;
2429 pcm_for_each_format(k) {
2430 int bits;
2431 if (!snd_mask_test_format(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
2432 continue;
2433 bits = snd_pcm_format_physical_width(k);
2434 if (bits <= 0)
2435 continue; /* ignore invalid formats */
2436 if (t.min > (unsigned)bits)
2437 t.min = bits;
2438 if (t.max < (unsigned)bits)
2439 t.max = bits;
2440 }
2441 t.integer = 1;
2442 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2443 }
2444
2445 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
2446 #error "Change this table"
2447 #endif
2448
2449 static const unsigned int rates[] = {
2450 5512, 8000, 11025, 16000, 22050, 32000, 44100,
2451 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000
2452 };
2453
2454 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
2455 .count = ARRAY_SIZE(rates),
2456 .list = rates,
2457 };
2458
snd_pcm_hw_rule_rate(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2459 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
2460 struct snd_pcm_hw_rule *rule)
2461 {
2462 struct snd_pcm_hardware *hw = rule->private;
2463 return snd_interval_list(hw_param_interval(params, rule->var),
2464 snd_pcm_known_rates.count,
2465 snd_pcm_known_rates.list, hw->rates);
2466 }
2467
snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params * params,struct snd_pcm_hw_rule * rule)2468 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
2469 struct snd_pcm_hw_rule *rule)
2470 {
2471 struct snd_interval t;
2472 struct snd_pcm_substream *substream = rule->private;
2473 t.min = 0;
2474 t.max = substream->buffer_bytes_max;
2475 t.openmin = 0;
2476 t.openmax = 0;
2477 t.integer = 1;
2478 return snd_interval_refine(hw_param_interval(params, rule->var), &t);
2479 }
2480
snd_pcm_hw_constraints_init(struct snd_pcm_substream * substream)2481 static int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
2482 {
2483 struct snd_pcm_runtime *runtime = substream->runtime;
2484 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
2485 int k, err;
2486
2487 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
2488 snd_mask_any(constrs_mask(constrs, k));
2489 }
2490
2491 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
2492 snd_interval_any(constrs_interval(constrs, k));
2493 }
2494
2495 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
2496 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
2497 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
2498 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
2499 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
2500
2501 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
2502 snd_pcm_hw_rule_format, NULL,
2503 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2504 if (err < 0)
2505 return err;
2506 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2507 snd_pcm_hw_rule_sample_bits, NULL,
2508 SNDRV_PCM_HW_PARAM_FORMAT,
2509 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2510 if (err < 0)
2511 return err;
2512 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
2513 snd_pcm_hw_rule_div, NULL,
2514 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2515 if (err < 0)
2516 return err;
2517 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2518 snd_pcm_hw_rule_mul, NULL,
2519 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
2520 if (err < 0)
2521 return err;
2522 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2523 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2524 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2525 if (err < 0)
2526 return err;
2527 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
2528 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2529 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
2530 if (err < 0)
2531 return err;
2532 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
2533 snd_pcm_hw_rule_div, NULL,
2534 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
2535 if (err < 0)
2536 return err;
2537 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2538 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2539 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
2540 if (err < 0)
2541 return err;
2542 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2543 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2544 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
2545 if (err < 0)
2546 return err;
2547 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
2548 snd_pcm_hw_rule_div, NULL,
2549 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
2550 if (err < 0)
2551 return err;
2552 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2553 snd_pcm_hw_rule_div, NULL,
2554 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2555 if (err < 0)
2556 return err;
2557 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2558 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2559 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2560 if (err < 0)
2561 return err;
2562 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
2563 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2564 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2565 if (err < 0)
2566 return err;
2567 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2568 snd_pcm_hw_rule_mul, NULL,
2569 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
2570 if (err < 0)
2571 return err;
2572 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2573 snd_pcm_hw_rule_mulkdiv, (void*) 8,
2574 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2575 if (err < 0)
2576 return err;
2577 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
2578 snd_pcm_hw_rule_muldivk, (void*) 1000000,
2579 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
2580 if (err < 0)
2581 return err;
2582 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2583 snd_pcm_hw_rule_muldivk, (void*) 8,
2584 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2585 if (err < 0)
2586 return err;
2587 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2588 snd_pcm_hw_rule_muldivk, (void*) 8,
2589 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
2590 if (err < 0)
2591 return err;
2592 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
2593 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2594 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2595 if (err < 0)
2596 return err;
2597 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
2598 snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
2599 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
2600 if (err < 0)
2601 return err;
2602 return 0;
2603 }
2604
snd_pcm_hw_constraints_complete(struct snd_pcm_substream * substream)2605 static int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
2606 {
2607 struct snd_pcm_runtime *runtime = substream->runtime;
2608 struct snd_pcm_hardware *hw = &runtime->hw;
2609 int err;
2610 unsigned int mask = 0;
2611
2612 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2613 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
2614 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2615 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
2616 if (hw_support_mmap(substream)) {
2617 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
2618 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
2619 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
2620 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
2621 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
2622 mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_COMPLEX);
2623 }
2624 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
2625 if (err < 0)
2626 return err;
2627
2628 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
2629 if (err < 0)
2630 return err;
2631
2632 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT,
2633 PARAM_MASK_BIT(SNDRV_PCM_SUBFORMAT_STD));
2634 if (err < 0)
2635 return err;
2636
2637 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
2638 hw->channels_min, hw->channels_max);
2639 if (err < 0)
2640 return err;
2641
2642 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
2643 hw->rate_min, hw->rate_max);
2644 if (err < 0)
2645 return err;
2646
2647 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
2648 hw->period_bytes_min, hw->period_bytes_max);
2649 if (err < 0)
2650 return err;
2651
2652 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
2653 hw->periods_min, hw->periods_max);
2654 if (err < 0)
2655 return err;
2656
2657 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2658 hw->period_bytes_min, hw->buffer_bytes_max);
2659 if (err < 0)
2660 return err;
2661
2662 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2663 snd_pcm_hw_rule_buffer_bytes_max, substream,
2664 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2665 if (err < 0)
2666 return err;
2667
2668 /* FIXME: remove */
2669 if (runtime->dma_bytes) {
2670 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2671 if (err < 0)
2672 return err;
2673 }
2674
2675 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2676 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2677 snd_pcm_hw_rule_rate, hw,
2678 SNDRV_PCM_HW_PARAM_RATE, -1);
2679 if (err < 0)
2680 return err;
2681 }
2682
2683 /* FIXME: this belong to lowlevel */
2684 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2685
2686 return 0;
2687 }
2688
pcm_release_private(struct snd_pcm_substream * substream)2689 static void pcm_release_private(struct snd_pcm_substream *substream)
2690 {
2691 if (snd_pcm_stream_linked(substream))
2692 snd_pcm_unlink(substream);
2693 }
2694
snd_pcm_release_substream(struct snd_pcm_substream * substream)2695 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2696 {
2697 substream->ref_count--;
2698 if (substream->ref_count > 0)
2699 return;
2700
2701 snd_pcm_drop(substream);
2702 if (substream->hw_opened) {
2703 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
2704 do_hw_free(substream);
2705 substream->ops->close(substream);
2706 substream->hw_opened = 0;
2707 }
2708 if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
2709 cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
2710 if (substream->pcm_release) {
2711 substream->pcm_release(substream);
2712 substream->pcm_release = NULL;
2713 }
2714 snd_pcm_detach_substream(substream);
2715 }
2716 EXPORT_SYMBOL(snd_pcm_release_substream);
2717
snd_pcm_open_substream(struct snd_pcm * pcm,int stream,struct file * file,struct snd_pcm_substream ** rsubstream)2718 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2719 struct file *file,
2720 struct snd_pcm_substream **rsubstream)
2721 {
2722 struct snd_pcm_substream *substream;
2723 int err;
2724
2725 err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2726 if (err < 0)
2727 return err;
2728 if (substream->ref_count > 1) {
2729 *rsubstream = substream;
2730 return 0;
2731 }
2732
2733 err = snd_pcm_hw_constraints_init(substream);
2734 if (err < 0) {
2735 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2736 goto error;
2737 }
2738
2739 err = substream->ops->open(substream);
2740 if (err < 0)
2741 goto error;
2742
2743 substream->hw_opened = 1;
2744
2745 err = snd_pcm_hw_constraints_complete(substream);
2746 if (err < 0) {
2747 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2748 goto error;
2749 }
2750
2751 /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
2752 * the DMA buffer requires it
2753 */
2754 if (substream->managed_buffer_alloc &&
2755 substream->dma_buffer.dev.need_sync)
2756 substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
2757
2758 *rsubstream = substream;
2759 return 0;
2760
2761 error:
2762 snd_pcm_release_substream(substream);
2763 return err;
2764 }
2765 EXPORT_SYMBOL(snd_pcm_open_substream);
2766
snd_pcm_open_file(struct file * file,struct snd_pcm * pcm,int stream)2767 static int snd_pcm_open_file(struct file *file,
2768 struct snd_pcm *pcm,
2769 int stream)
2770 {
2771 struct snd_pcm_file *pcm_file;
2772 struct snd_pcm_substream *substream;
2773 int err;
2774
2775 err = snd_pcm_open_substream(pcm, stream, file, &substream);
2776 if (err < 0)
2777 return err;
2778
2779 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2780 if (pcm_file == NULL) {
2781 snd_pcm_release_substream(substream);
2782 return -ENOMEM;
2783 }
2784 pcm_file->substream = substream;
2785 if (substream->ref_count == 1)
2786 substream->pcm_release = pcm_release_private;
2787 file->private_data = pcm_file;
2788
2789 return 0;
2790 }
2791
snd_pcm_playback_open(struct inode * inode,struct file * file)2792 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2793 {
2794 struct snd_pcm *pcm;
2795 int err = nonseekable_open(inode, file);
2796 if (err < 0)
2797 return err;
2798 pcm = snd_lookup_minor_data(iminor(inode),
2799 SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2800 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2801 if (pcm)
2802 snd_card_unref(pcm->card);
2803 return err;
2804 }
2805
snd_pcm_capture_open(struct inode * inode,struct file * file)2806 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2807 {
2808 struct snd_pcm *pcm;
2809 int err = nonseekable_open(inode, file);
2810 if (err < 0)
2811 return err;
2812 pcm = snd_lookup_minor_data(iminor(inode),
2813 SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2814 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2815 if (pcm)
2816 snd_card_unref(pcm->card);
2817 return err;
2818 }
2819
snd_pcm_open(struct file * file,struct snd_pcm * pcm,int stream)2820 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2821 {
2822 int err;
2823 wait_queue_entry_t wait;
2824
2825 if (pcm == NULL) {
2826 err = -ENODEV;
2827 goto __error1;
2828 }
2829 err = snd_card_file_add(pcm->card, file);
2830 if (err < 0)
2831 goto __error1;
2832 if (!try_module_get(pcm->card->module)) {
2833 err = -EFAULT;
2834 goto __error2;
2835 }
2836 init_waitqueue_entry(&wait, current);
2837 add_wait_queue(&pcm->open_wait, &wait);
2838 mutex_lock(&pcm->open_mutex);
2839 while (1) {
2840 err = snd_pcm_open_file(file, pcm, stream);
2841 if (err >= 0)
2842 break;
2843 if (err == -EAGAIN) {
2844 if (file->f_flags & O_NONBLOCK) {
2845 err = -EBUSY;
2846 break;
2847 }
2848 } else
2849 break;
2850 set_current_state(TASK_INTERRUPTIBLE);
2851 mutex_unlock(&pcm->open_mutex);
2852 schedule();
2853 mutex_lock(&pcm->open_mutex);
2854 if (pcm->card->shutdown) {
2855 err = -ENODEV;
2856 break;
2857 }
2858 if (signal_pending(current)) {
2859 err = -ERESTARTSYS;
2860 break;
2861 }
2862 }
2863 remove_wait_queue(&pcm->open_wait, &wait);
2864 mutex_unlock(&pcm->open_mutex);
2865 if (err < 0)
2866 goto __error;
2867 return err;
2868
2869 __error:
2870 module_put(pcm->card->module);
2871 __error2:
2872 snd_card_file_remove(pcm->card, file);
2873 __error1:
2874 return err;
2875 }
2876
snd_pcm_release(struct inode * inode,struct file * file)2877 static int snd_pcm_release(struct inode *inode, struct file *file)
2878 {
2879 struct snd_pcm *pcm;
2880 struct snd_pcm_substream *substream;
2881 struct snd_pcm_file *pcm_file;
2882
2883 pcm_file = file->private_data;
2884 substream = pcm_file->substream;
2885 if (snd_BUG_ON(!substream))
2886 return -ENXIO;
2887 pcm = substream->pcm;
2888
2889 /* block until the device gets woken up as it may touch the hardware */
2890 snd_power_wait(pcm->card);
2891
2892 mutex_lock(&pcm->open_mutex);
2893 snd_pcm_release_substream(substream);
2894 kfree(pcm_file);
2895 mutex_unlock(&pcm->open_mutex);
2896 wake_up(&pcm->open_wait);
2897 module_put(pcm->card->module);
2898 snd_card_file_remove(pcm->card, file);
2899 return 0;
2900 }
2901
2902 /* check and update PCM state; return 0 or a negative error
2903 * call this inside PCM lock
2904 */
do_pcm_hwsync(struct snd_pcm_substream * substream)2905 static int do_pcm_hwsync(struct snd_pcm_substream *substream)
2906 {
2907 switch (substream->runtime->status->state) {
2908 case SNDRV_PCM_STATE_DRAINING:
2909 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2910 return -EBADFD;
2911 fallthrough;
2912 case SNDRV_PCM_STATE_RUNNING:
2913 return snd_pcm_update_hw_ptr(substream);
2914 case SNDRV_PCM_STATE_PREPARED:
2915 case SNDRV_PCM_STATE_PAUSED:
2916 return 0;
2917 case SNDRV_PCM_STATE_SUSPENDED:
2918 return -ESTRPIPE;
2919 case SNDRV_PCM_STATE_XRUN:
2920 return -EPIPE;
2921 default:
2922 return -EBADFD;
2923 }
2924 }
2925
2926 /* increase the appl_ptr; returns the processed frames or a negative error */
forward_appl_ptr(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames,snd_pcm_sframes_t avail)2927 static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream,
2928 snd_pcm_uframes_t frames,
2929 snd_pcm_sframes_t avail)
2930 {
2931 struct snd_pcm_runtime *runtime = substream->runtime;
2932 snd_pcm_sframes_t appl_ptr;
2933 int ret;
2934
2935 if (avail <= 0)
2936 return 0;
2937 if (frames > (snd_pcm_uframes_t)avail)
2938 frames = avail;
2939 appl_ptr = runtime->control->appl_ptr + frames;
2940 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2941 appl_ptr -= runtime->boundary;
2942 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2943 return ret < 0 ? ret : frames;
2944 }
2945
2946 /* decrease the appl_ptr; returns the processed frames or zero for error */
rewind_appl_ptr(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames,snd_pcm_sframes_t avail)2947 static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream,
2948 snd_pcm_uframes_t frames,
2949 snd_pcm_sframes_t avail)
2950 {
2951 struct snd_pcm_runtime *runtime = substream->runtime;
2952 snd_pcm_sframes_t appl_ptr;
2953 int ret;
2954
2955 if (avail <= 0)
2956 return 0;
2957 if (frames > (snd_pcm_uframes_t)avail)
2958 frames = avail;
2959 appl_ptr = runtime->control->appl_ptr - frames;
2960 if (appl_ptr < 0)
2961 appl_ptr += runtime->boundary;
2962 ret = pcm_lib_apply_appl_ptr(substream, appl_ptr);
2963 /* NOTE: we return zero for errors because PulseAudio gets depressed
2964 * upon receiving an error from rewind ioctl and stops processing
2965 * any longer. Returning zero means that no rewind is done, so
2966 * it's not absolutely wrong to answer like that.
2967 */
2968 return ret < 0 ? 0 : frames;
2969 }
2970
snd_pcm_rewind(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2971 static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream,
2972 snd_pcm_uframes_t frames)
2973 {
2974 snd_pcm_sframes_t ret;
2975
2976 if (frames == 0)
2977 return 0;
2978
2979 snd_pcm_stream_lock_irq(substream);
2980 ret = do_pcm_hwsync(substream);
2981 if (!ret)
2982 ret = rewind_appl_ptr(substream, frames,
2983 snd_pcm_hw_avail(substream));
2984 snd_pcm_stream_unlock_irq(substream);
2985 if (ret >= 0)
2986 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
2987 return ret;
2988 }
2989
snd_pcm_forward(struct snd_pcm_substream * substream,snd_pcm_uframes_t frames)2990 static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
2991 snd_pcm_uframes_t frames)
2992 {
2993 snd_pcm_sframes_t ret;
2994
2995 if (frames == 0)
2996 return 0;
2997
2998 snd_pcm_stream_lock_irq(substream);
2999 ret = do_pcm_hwsync(substream);
3000 if (!ret)
3001 ret = forward_appl_ptr(substream, frames,
3002 snd_pcm_avail(substream));
3003 snd_pcm_stream_unlock_irq(substream);
3004 if (ret >= 0)
3005 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3006 return ret;
3007 }
3008
snd_pcm_delay(struct snd_pcm_substream * substream,snd_pcm_sframes_t * delay)3009 static int snd_pcm_delay(struct snd_pcm_substream *substream,
3010 snd_pcm_sframes_t *delay)
3011 {
3012 int err;
3013
3014 snd_pcm_stream_lock_irq(substream);
3015 err = do_pcm_hwsync(substream);
3016 if (delay && !err)
3017 *delay = snd_pcm_calc_delay(substream);
3018 snd_pcm_stream_unlock_irq(substream);
3019 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
3020
3021 return err;
3022 }
3023
snd_pcm_hwsync(struct snd_pcm_substream * substream)3024 static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
3025 {
3026 return snd_pcm_delay(substream, NULL);
3027 }
3028
snd_pcm_sync_ptr(struct snd_pcm_substream * substream,struct snd_pcm_sync_ptr __user * _sync_ptr)3029 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
3030 struct snd_pcm_sync_ptr __user *_sync_ptr)
3031 {
3032 struct snd_pcm_runtime *runtime = substream->runtime;
3033 struct snd_pcm_sync_ptr sync_ptr;
3034 volatile struct snd_pcm_mmap_status *status;
3035 volatile struct snd_pcm_mmap_control *control;
3036 int err;
3037
3038 memset(&sync_ptr, 0, sizeof(sync_ptr));
3039 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
3040 return -EFAULT;
3041 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
3042 return -EFAULT;
3043 status = runtime->status;
3044 control = runtime->control;
3045 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3046 err = snd_pcm_hwsync(substream);
3047 if (err < 0)
3048 return err;
3049 }
3050 snd_pcm_stream_lock_irq(substream);
3051 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
3052 err = pcm_lib_apply_appl_ptr(substream,
3053 sync_ptr.c.control.appl_ptr);
3054 if (err < 0) {
3055 snd_pcm_stream_unlock_irq(substream);
3056 return err;
3057 }
3058 } else {
3059 sync_ptr.c.control.appl_ptr = control->appl_ptr;
3060 }
3061 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3062 control->avail_min = sync_ptr.c.control.avail_min;
3063 else
3064 sync_ptr.c.control.avail_min = control->avail_min;
3065 sync_ptr.s.status.state = status->state;
3066 sync_ptr.s.status.hw_ptr = status->hw_ptr;
3067 sync_ptr.s.status.tstamp = status->tstamp;
3068 sync_ptr.s.status.suspended_state = status->suspended_state;
3069 sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
3070 snd_pcm_stream_unlock_irq(substream);
3071 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
3072 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3073 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
3074 return -EFAULT;
3075 return 0;
3076 }
3077
3078 struct snd_pcm_mmap_status32 {
3079 snd_pcm_state_t state;
3080 s32 pad1;
3081 u32 hw_ptr;
3082 s32 tstamp_sec;
3083 s32 tstamp_nsec;
3084 snd_pcm_state_t suspended_state;
3085 s32 audio_tstamp_sec;
3086 s32 audio_tstamp_nsec;
3087 } __attribute__((packed));
3088
3089 struct snd_pcm_mmap_control32 {
3090 u32 appl_ptr;
3091 u32 avail_min;
3092 };
3093
3094 struct snd_pcm_sync_ptr32 {
3095 u32 flags;
3096 union {
3097 struct snd_pcm_mmap_status32 status;
3098 unsigned char reserved[64];
3099 } s;
3100 union {
3101 struct snd_pcm_mmap_control32 control;
3102 unsigned char reserved[64];
3103 } c;
3104 } __attribute__((packed));
3105
3106 /* recalcuate the boundary within 32bit */
recalculate_boundary(struct snd_pcm_runtime * runtime)3107 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
3108 {
3109 snd_pcm_uframes_t boundary;
3110
3111 if (! runtime->buffer_size)
3112 return 0;
3113 boundary = runtime->buffer_size;
3114 while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
3115 boundary *= 2;
3116 return boundary;
3117 }
3118
snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream * substream,struct snd_pcm_sync_ptr32 __user * src)3119 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
3120 struct snd_pcm_sync_ptr32 __user *src)
3121 {
3122 struct snd_pcm_runtime *runtime = substream->runtime;
3123 volatile struct snd_pcm_mmap_status *status;
3124 volatile struct snd_pcm_mmap_control *control;
3125 u32 sflags;
3126 struct snd_pcm_mmap_control scontrol;
3127 struct snd_pcm_mmap_status sstatus;
3128 snd_pcm_uframes_t boundary;
3129 int err;
3130
3131 if (snd_BUG_ON(!runtime))
3132 return -EINVAL;
3133
3134 if (get_user(sflags, &src->flags) ||
3135 get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3136 get_user(scontrol.avail_min, &src->c.control.avail_min))
3137 return -EFAULT;
3138 if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
3139 err = snd_pcm_hwsync(substream);
3140 if (err < 0)
3141 return err;
3142 }
3143 status = runtime->status;
3144 control = runtime->control;
3145 boundary = recalculate_boundary(runtime);
3146 if (! boundary)
3147 boundary = 0x7fffffff;
3148 snd_pcm_stream_lock_irq(substream);
3149 /* FIXME: we should consider the boundary for the sync from app */
3150 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
3151 err = pcm_lib_apply_appl_ptr(substream,
3152 scontrol.appl_ptr);
3153 if (err < 0) {
3154 snd_pcm_stream_unlock_irq(substream);
3155 return err;
3156 }
3157 } else
3158 scontrol.appl_ptr = control->appl_ptr % boundary;
3159 if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
3160 control->avail_min = scontrol.avail_min;
3161 else
3162 scontrol.avail_min = control->avail_min;
3163 sstatus.state = status->state;
3164 sstatus.hw_ptr = status->hw_ptr % boundary;
3165 sstatus.tstamp = status->tstamp;
3166 sstatus.suspended_state = status->suspended_state;
3167 sstatus.audio_tstamp = status->audio_tstamp;
3168 snd_pcm_stream_unlock_irq(substream);
3169 if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
3170 snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
3171 if (put_user(sstatus.state, &src->s.status.state) ||
3172 put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
3173 put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
3174 put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
3175 put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
3176 put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
3177 put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
3178 put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
3179 put_user(scontrol.avail_min, &src->c.control.avail_min))
3180 return -EFAULT;
3181
3182 return 0;
3183 }
3184 #define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
3185
snd_pcm_tstamp(struct snd_pcm_substream * substream,int __user * _arg)3186 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
3187 {
3188 struct snd_pcm_runtime *runtime = substream->runtime;
3189 int arg;
3190
3191 if (get_user(arg, _arg))
3192 return -EFAULT;
3193 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
3194 return -EINVAL;
3195 runtime->tstamp_type = arg;
3196 return 0;
3197 }
3198
snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream * substream,struct snd_xferi __user * _xferi)3199 static int snd_pcm_xferi_frames_ioctl(struct snd_pcm_substream *substream,
3200 struct snd_xferi __user *_xferi)
3201 {
3202 struct snd_xferi xferi;
3203 struct snd_pcm_runtime *runtime = substream->runtime;
3204 snd_pcm_sframes_t result;
3205
3206 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3207 return -EBADFD;
3208 if (put_user(0, &_xferi->result))
3209 return -EFAULT;
3210 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
3211 return -EFAULT;
3212 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3213 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
3214 else
3215 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
3216 if (put_user(result, &_xferi->result))
3217 return -EFAULT;
3218 return result < 0 ? result : 0;
3219 }
3220
snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream * substream,struct snd_xfern __user * _xfern)3221 static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream,
3222 struct snd_xfern __user *_xfern)
3223 {
3224 struct snd_xfern xfern;
3225 struct snd_pcm_runtime *runtime = substream->runtime;
3226 void *bufs;
3227 snd_pcm_sframes_t result;
3228
3229 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3230 return -EBADFD;
3231 if (runtime->channels > 128)
3232 return -EINVAL;
3233 if (put_user(0, &_xfern->result))
3234 return -EFAULT;
3235 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
3236 return -EFAULT;
3237
3238 bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels);
3239 if (IS_ERR(bufs))
3240 return PTR_ERR(bufs);
3241 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3242 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
3243 else
3244 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
3245 kfree(bufs);
3246 if (put_user(result, &_xfern->result))
3247 return -EFAULT;
3248 return result < 0 ? result : 0;
3249 }
3250
snd_pcm_rewind_ioctl(struct snd_pcm_substream * substream,snd_pcm_uframes_t __user * _frames)3251 static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream,
3252 snd_pcm_uframes_t __user *_frames)
3253 {
3254 snd_pcm_uframes_t frames;
3255 snd_pcm_sframes_t result;
3256
3257 if (get_user(frames, _frames))
3258 return -EFAULT;
3259 if (put_user(0, _frames))
3260 return -EFAULT;
3261 result = snd_pcm_rewind(substream, frames);
3262 if (put_user(result, _frames))
3263 return -EFAULT;
3264 return result < 0 ? result : 0;
3265 }
3266
snd_pcm_forward_ioctl(struct snd_pcm_substream * substream,snd_pcm_uframes_t __user * _frames)3267 static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream,
3268 snd_pcm_uframes_t __user *_frames)
3269 {
3270 snd_pcm_uframes_t frames;
3271 snd_pcm_sframes_t result;
3272
3273 if (get_user(frames, _frames))
3274 return -EFAULT;
3275 if (put_user(0, _frames))
3276 return -EFAULT;
3277 result = snd_pcm_forward(substream, frames);
3278 if (put_user(result, _frames))
3279 return -EFAULT;
3280 return result < 0 ? result : 0;
3281 }
3282
snd_pcm_common_ioctl(struct file * file,struct snd_pcm_substream * substream,unsigned int cmd,void __user * arg)3283 static int snd_pcm_common_ioctl(struct file *file,
3284 struct snd_pcm_substream *substream,
3285 unsigned int cmd, void __user *arg)
3286 {
3287 struct snd_pcm_file *pcm_file = file->private_data;
3288 int res;
3289
3290 if (PCM_RUNTIME_CHECK(substream))
3291 return -ENXIO;
3292
3293 if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3294 return -EBADFD;
3295
3296 res = snd_power_wait(substream->pcm->card);
3297 if (res < 0)
3298 return res;
3299
3300 switch (cmd) {
3301 case SNDRV_PCM_IOCTL_PVERSION:
3302 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
3303 case SNDRV_PCM_IOCTL_INFO:
3304 return snd_pcm_info_user(substream, arg);
3305 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
3306 return 0;
3307 case SNDRV_PCM_IOCTL_TTSTAMP:
3308 return snd_pcm_tstamp(substream, arg);
3309 case SNDRV_PCM_IOCTL_USER_PVERSION:
3310 if (get_user(pcm_file->user_pversion,
3311 (unsigned int __user *)arg))
3312 return -EFAULT;
3313 return 0;
3314 case SNDRV_PCM_IOCTL_HW_REFINE:
3315 return snd_pcm_hw_refine_user(substream, arg);
3316 case SNDRV_PCM_IOCTL_HW_PARAMS:
3317 return snd_pcm_hw_params_user(substream, arg);
3318 case SNDRV_PCM_IOCTL_HW_FREE:
3319 return snd_pcm_hw_free(substream);
3320 case SNDRV_PCM_IOCTL_SW_PARAMS:
3321 return snd_pcm_sw_params_user(substream, arg);
3322 case SNDRV_PCM_IOCTL_STATUS32:
3323 return snd_pcm_status_user32(substream, arg, false);
3324 case SNDRV_PCM_IOCTL_STATUS_EXT32:
3325 return snd_pcm_status_user32(substream, arg, true);
3326 case SNDRV_PCM_IOCTL_STATUS64:
3327 return snd_pcm_status_user64(substream, arg, false);
3328 case SNDRV_PCM_IOCTL_STATUS_EXT64:
3329 return snd_pcm_status_user64(substream, arg, true);
3330 case SNDRV_PCM_IOCTL_CHANNEL_INFO:
3331 return snd_pcm_channel_info_user(substream, arg);
3332 case SNDRV_PCM_IOCTL_PREPARE:
3333 return snd_pcm_prepare(substream, file);
3334 case SNDRV_PCM_IOCTL_RESET:
3335 return snd_pcm_reset(substream);
3336 case SNDRV_PCM_IOCTL_START:
3337 return snd_pcm_start_lock_irq(substream);
3338 case SNDRV_PCM_IOCTL_LINK:
3339 return snd_pcm_link(substream, (int)(unsigned long) arg);
3340 case SNDRV_PCM_IOCTL_UNLINK:
3341 return snd_pcm_unlink(substream);
3342 case SNDRV_PCM_IOCTL_RESUME:
3343 return snd_pcm_resume(substream);
3344 case SNDRV_PCM_IOCTL_XRUN:
3345 return snd_pcm_xrun(substream);
3346 case SNDRV_PCM_IOCTL_HWSYNC:
3347 return snd_pcm_hwsync(substream);
3348 case SNDRV_PCM_IOCTL_DELAY:
3349 {
3350 snd_pcm_sframes_t delay = 0;
3351 snd_pcm_sframes_t __user *res = arg;
3352 int err;
3353
3354 err = snd_pcm_delay(substream, &delay);
3355 if (err)
3356 return err;
3357 if (put_user(delay, res))
3358 return -EFAULT;
3359 return 0;
3360 }
3361 case __SNDRV_PCM_IOCTL_SYNC_PTR32:
3362 return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
3363 case __SNDRV_PCM_IOCTL_SYNC_PTR64:
3364 return snd_pcm_sync_ptr(substream, arg);
3365 #ifdef CONFIG_SND_SUPPORT_OLD_API
3366 case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
3367 return snd_pcm_hw_refine_old_user(substream, arg);
3368 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
3369 return snd_pcm_hw_params_old_user(substream, arg);
3370 #endif
3371 case SNDRV_PCM_IOCTL_DRAIN:
3372 return snd_pcm_drain(substream, file);
3373 case SNDRV_PCM_IOCTL_DROP:
3374 return snd_pcm_drop(substream);
3375 case SNDRV_PCM_IOCTL_PAUSE:
3376 return snd_pcm_pause_lock_irq(substream, (unsigned long)arg);
3377 case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
3378 case SNDRV_PCM_IOCTL_READI_FRAMES:
3379 return snd_pcm_xferi_frames_ioctl(substream, arg);
3380 case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
3381 case SNDRV_PCM_IOCTL_READN_FRAMES:
3382 return snd_pcm_xfern_frames_ioctl(substream, arg);
3383 case SNDRV_PCM_IOCTL_REWIND:
3384 return snd_pcm_rewind_ioctl(substream, arg);
3385 case SNDRV_PCM_IOCTL_FORWARD:
3386 return snd_pcm_forward_ioctl(substream, arg);
3387 }
3388 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
3389 return -ENOTTY;
3390 }
3391
snd_pcm_ioctl(struct file * file,unsigned int cmd,unsigned long arg)3392 static long snd_pcm_ioctl(struct file *file, unsigned int cmd,
3393 unsigned long arg)
3394 {
3395 struct snd_pcm_file *pcm_file;
3396
3397 pcm_file = file->private_data;
3398
3399 if (((cmd >> 8) & 0xff) != 'A')
3400 return -ENOTTY;
3401
3402 return snd_pcm_common_ioctl(file, pcm_file->substream, cmd,
3403 (void __user *)arg);
3404 }
3405
3406 /**
3407 * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space
3408 * @substream: PCM substream
3409 * @cmd: IOCTL cmd
3410 * @arg: IOCTL argument
3411 *
3412 * The function is provided primarily for OSS layer and USB gadget drivers,
3413 * and it allows only the limited set of ioctls (hw_params, sw_params,
3414 * prepare, start, drain, drop, forward).
3415 */
snd_pcm_kernel_ioctl(struct snd_pcm_substream * substream,unsigned int cmd,void * arg)3416 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
3417 unsigned int cmd, void *arg)
3418 {
3419 snd_pcm_uframes_t *frames = arg;
3420 snd_pcm_sframes_t result;
3421
3422 if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3423 return -EBADFD;
3424
3425 switch (cmd) {
3426 case SNDRV_PCM_IOCTL_FORWARD:
3427 {
3428 /* provided only for OSS; capture-only and no value returned */
3429 if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
3430 return -EINVAL;
3431 result = snd_pcm_forward(substream, *frames);
3432 return result < 0 ? result : 0;
3433 }
3434 case SNDRV_PCM_IOCTL_HW_PARAMS:
3435 return snd_pcm_hw_params(substream, arg);
3436 case SNDRV_PCM_IOCTL_SW_PARAMS:
3437 return snd_pcm_sw_params(substream, arg);
3438 case SNDRV_PCM_IOCTL_PREPARE:
3439 return snd_pcm_prepare(substream, NULL);
3440 case SNDRV_PCM_IOCTL_START:
3441 return snd_pcm_start_lock_irq(substream);
3442 case SNDRV_PCM_IOCTL_DRAIN:
3443 return snd_pcm_drain(substream, NULL);
3444 case SNDRV_PCM_IOCTL_DROP:
3445 return snd_pcm_drop(substream);
3446 case SNDRV_PCM_IOCTL_DELAY:
3447 return snd_pcm_delay(substream, frames);
3448 default:
3449 return -EINVAL;
3450 }
3451 }
3452 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
3453
snd_pcm_read(struct file * file,char __user * buf,size_t count,loff_t * offset)3454 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
3455 loff_t * offset)
3456 {
3457 struct snd_pcm_file *pcm_file;
3458 struct snd_pcm_substream *substream;
3459 struct snd_pcm_runtime *runtime;
3460 snd_pcm_sframes_t result;
3461
3462 pcm_file = file->private_data;
3463 substream = pcm_file->substream;
3464 if (PCM_RUNTIME_CHECK(substream))
3465 return -ENXIO;
3466 runtime = substream->runtime;
3467 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
3468 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3469 return -EBADFD;
3470 if (!frame_aligned(runtime, count))
3471 return -EINVAL;
3472 count = bytes_to_frames(runtime, count);
3473 result = snd_pcm_lib_read(substream, buf, count);
3474 if (result > 0)
3475 result = frames_to_bytes(runtime, result);
3476 return result;
3477 }
3478
snd_pcm_write(struct file * file,const char __user * buf,size_t count,loff_t * offset)3479 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
3480 size_t count, loff_t * offset)
3481 {
3482 struct snd_pcm_file *pcm_file;
3483 struct snd_pcm_substream *substream;
3484 struct snd_pcm_runtime *runtime;
3485 snd_pcm_sframes_t result;
3486
3487 pcm_file = file->private_data;
3488 substream = pcm_file->substream;
3489 if (PCM_RUNTIME_CHECK(substream))
3490 return -ENXIO;
3491 runtime = substream->runtime;
3492 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
3493 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3494 return -EBADFD;
3495 if (!frame_aligned(runtime, count))
3496 return -EINVAL;
3497 count = bytes_to_frames(runtime, count);
3498 result = snd_pcm_lib_write(substream, buf, count);
3499 if (result > 0)
3500 result = frames_to_bytes(runtime, result);
3501 return result;
3502 }
3503
snd_pcm_readv(struct kiocb * iocb,struct iov_iter * to)3504 static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to)
3505 {
3506 struct snd_pcm_file *pcm_file;
3507 struct snd_pcm_substream *substream;
3508 struct snd_pcm_runtime *runtime;
3509 snd_pcm_sframes_t result;
3510 unsigned long i;
3511 void __user **bufs;
3512 snd_pcm_uframes_t frames;
3513
3514 pcm_file = iocb->ki_filp->private_data;
3515 substream = pcm_file->substream;
3516 if (PCM_RUNTIME_CHECK(substream))
3517 return -ENXIO;
3518 runtime = substream->runtime;
3519 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
3520 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3521 return -EBADFD;
3522 if (!iter_is_iovec(to))
3523 return -EINVAL;
3524 if (to->nr_segs > 1024 || to->nr_segs != runtime->channels)
3525 return -EINVAL;
3526 if (!frame_aligned(runtime, to->iov->iov_len))
3527 return -EINVAL;
3528 frames = bytes_to_samples(runtime, to->iov->iov_len);
3529 bufs = kmalloc_array(to->nr_segs, sizeof(void *), GFP_KERNEL);
3530 if (bufs == NULL)
3531 return -ENOMEM;
3532 for (i = 0; i < to->nr_segs; ++i)
3533 bufs[i] = to->iov[i].iov_base;
3534 result = snd_pcm_lib_readv(substream, bufs, frames);
3535 if (result > 0)
3536 result = frames_to_bytes(runtime, result);
3537 kfree(bufs);
3538 return result;
3539 }
3540
snd_pcm_writev(struct kiocb * iocb,struct iov_iter * from)3541 static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from)
3542 {
3543 struct snd_pcm_file *pcm_file;
3544 struct snd_pcm_substream *substream;
3545 struct snd_pcm_runtime *runtime;
3546 snd_pcm_sframes_t result;
3547 unsigned long i;
3548 void __user **bufs;
3549 snd_pcm_uframes_t frames;
3550
3551 pcm_file = iocb->ki_filp->private_data;
3552 substream = pcm_file->substream;
3553 if (PCM_RUNTIME_CHECK(substream))
3554 return -ENXIO;
3555 runtime = substream->runtime;
3556 if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
3557 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3558 return -EBADFD;
3559 if (!iter_is_iovec(from))
3560 return -EINVAL;
3561 if (from->nr_segs > 128 || from->nr_segs != runtime->channels ||
3562 !frame_aligned(runtime, from->iov->iov_len))
3563 return -EINVAL;
3564 frames = bytes_to_samples(runtime, from->iov->iov_len);
3565 bufs = kmalloc_array(from->nr_segs, sizeof(void *), GFP_KERNEL);
3566 if (bufs == NULL)
3567 return -ENOMEM;
3568 for (i = 0; i < from->nr_segs; ++i)
3569 bufs[i] = from->iov[i].iov_base;
3570 result = snd_pcm_lib_writev(substream, bufs, frames);
3571 if (result > 0)
3572 result = frames_to_bytes(runtime, result);
3573 kfree(bufs);
3574 return result;
3575 }
3576
snd_pcm_poll(struct file * file,poll_table * wait)3577 static __poll_t snd_pcm_poll(struct file *file, poll_table *wait)
3578 {
3579 struct snd_pcm_file *pcm_file;
3580 struct snd_pcm_substream *substream;
3581 struct snd_pcm_runtime *runtime;
3582 __poll_t mask, ok;
3583 snd_pcm_uframes_t avail;
3584
3585 pcm_file = file->private_data;
3586
3587 substream = pcm_file->substream;
3588 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
3589 ok = EPOLLOUT | EPOLLWRNORM;
3590 else
3591 ok = EPOLLIN | EPOLLRDNORM;
3592 if (PCM_RUNTIME_CHECK(substream))
3593 return ok | EPOLLERR;
3594
3595 runtime = substream->runtime;
3596 if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3597 return ok | EPOLLERR;
3598
3599 poll_wait(file, &runtime->sleep, wait);
3600
3601 mask = 0;
3602 snd_pcm_stream_lock_irq(substream);
3603 avail = snd_pcm_avail(substream);
3604 switch (runtime->status->state) {
3605 case SNDRV_PCM_STATE_RUNNING:
3606 case SNDRV_PCM_STATE_PREPARED:
3607 case SNDRV_PCM_STATE_PAUSED:
3608 if (avail >= runtime->control->avail_min)
3609 mask = ok;
3610 break;
3611 case SNDRV_PCM_STATE_DRAINING:
3612 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
3613 mask = ok;
3614 if (!avail)
3615 mask |= EPOLLERR;
3616 }
3617 break;
3618 default:
3619 mask = ok | EPOLLERR;
3620 break;
3621 }
3622 snd_pcm_stream_unlock_irq(substream);
3623 return mask;
3624 }
3625
3626 /*
3627 * mmap support
3628 */
3629
3630 /*
3631 * Only on coherent architectures, we can mmap the status and the control records
3632 * for effcient data transfer. On others, we have to use HWSYNC ioctl...
3633 */
3634 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3635 /*
3636 * mmap status record
3637 */
snd_pcm_mmap_status_fault(struct vm_fault * vmf)3638 static vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf)
3639 {
3640 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3641 struct snd_pcm_runtime *runtime;
3642
3643 if (substream == NULL)
3644 return VM_FAULT_SIGBUS;
3645 runtime = substream->runtime;
3646 vmf->page = virt_to_page(runtime->status);
3647 get_page(vmf->page);
3648 return 0;
3649 }
3650
3651 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3652 {
3653 .fault = snd_pcm_mmap_status_fault,
3654 };
3655
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3656 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3657 struct vm_area_struct *area)
3658 {
3659 long size;
3660 if (!(area->vm_flags & VM_READ))
3661 return -EINVAL;
3662 size = area->vm_end - area->vm_start;
3663 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3664 return -EINVAL;
3665 area->vm_ops = &snd_pcm_vm_ops_status;
3666 area->vm_private_data = substream;
3667 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3668 return 0;
3669 }
3670
3671 /*
3672 * mmap control record
3673 */
snd_pcm_mmap_control_fault(struct vm_fault * vmf)3674 static vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf)
3675 {
3676 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3677 struct snd_pcm_runtime *runtime;
3678
3679 if (substream == NULL)
3680 return VM_FAULT_SIGBUS;
3681 runtime = substream->runtime;
3682 vmf->page = virt_to_page(runtime->control);
3683 get_page(vmf->page);
3684 return 0;
3685 }
3686
3687 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3688 {
3689 .fault = snd_pcm_mmap_control_fault,
3690 };
3691
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3692 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3693 struct vm_area_struct *area)
3694 {
3695 long size;
3696 if (!(area->vm_flags & VM_READ))
3697 return -EINVAL;
3698 size = area->vm_end - area->vm_start;
3699 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3700 return -EINVAL;
3701 area->vm_ops = &snd_pcm_vm_ops_control;
3702 area->vm_private_data = substream;
3703 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3704 return 0;
3705 }
3706
pcm_status_mmap_allowed(struct snd_pcm_file * pcm_file)3707 static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file)
3708 {
3709 /* If drivers require the explicit sync (typically for non-coherent
3710 * pages), we have to disable the mmap of status and control data
3711 * to enforce the control via SYNC_PTR ioctl.
3712 */
3713 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3714 return false;
3715 /* See pcm_control_mmap_allowed() below.
3716 * Since older alsa-lib requires both status and control mmaps to be
3717 * coupled, we have to disable the status mmap for old alsa-lib, too.
3718 */
3719 if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) &&
3720 (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR))
3721 return false;
3722 return true;
3723 }
3724
pcm_control_mmap_allowed(struct snd_pcm_file * pcm_file)3725 static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file)
3726 {
3727 if (pcm_file->no_compat_mmap)
3728 return false;
3729 /* see above */
3730 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
3731 return false;
3732 /* Disallow the control mmap when SYNC_APPLPTR flag is set;
3733 * it enforces the user-space to fall back to snd_pcm_sync_ptr(),
3734 * thus it effectively assures the manual update of appl_ptr.
3735 */
3736 if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)
3737 return false;
3738 return true;
3739 }
3740
3741 #else /* ! coherent mmap */
3742 /*
3743 * don't support mmap for status and control records.
3744 */
3745 #define pcm_status_mmap_allowed(pcm_file) false
3746 #define pcm_control_mmap_allowed(pcm_file) false
3747
snd_pcm_mmap_status(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3748 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3749 struct vm_area_struct *area)
3750 {
3751 return -ENXIO;
3752 }
snd_pcm_mmap_control(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3753 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3754 struct vm_area_struct *area)
3755 {
3756 return -ENXIO;
3757 }
3758 #endif /* coherent mmap */
3759
3760 /*
3761 * fault callback for mmapping a RAM page
3762 */
snd_pcm_mmap_data_fault(struct vm_fault * vmf)3763 static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
3764 {
3765 struct snd_pcm_substream *substream = vmf->vma->vm_private_data;
3766 struct snd_pcm_runtime *runtime;
3767 unsigned long offset;
3768 struct page * page;
3769 size_t dma_bytes;
3770
3771 if (substream == NULL)
3772 return VM_FAULT_SIGBUS;
3773 runtime = substream->runtime;
3774 offset = vmf->pgoff << PAGE_SHIFT;
3775 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3776 if (offset > dma_bytes - PAGE_SIZE)
3777 return VM_FAULT_SIGBUS;
3778 if (substream->ops->page)
3779 page = substream->ops->page(substream, offset);
3780 else if (!snd_pcm_get_dma_buf(substream))
3781 page = virt_to_page(runtime->dma_area + offset);
3782 else
3783 page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
3784 if (!page)
3785 return VM_FAULT_SIGBUS;
3786 get_page(page);
3787 vmf->page = page;
3788 return 0;
3789 }
3790
3791 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3792 .open = snd_pcm_mmap_data_open,
3793 .close = snd_pcm_mmap_data_close,
3794 };
3795
3796 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3797 .open = snd_pcm_mmap_data_open,
3798 .close = snd_pcm_mmap_data_close,
3799 .fault = snd_pcm_mmap_data_fault,
3800 };
3801
3802 /*
3803 * mmap the DMA buffer on RAM
3804 */
3805
3806 /**
3807 * snd_pcm_lib_default_mmap - Default PCM data mmap function
3808 * @substream: PCM substream
3809 * @area: VMA
3810 *
3811 * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL,
3812 * this function is invoked implicitly.
3813 */
snd_pcm_lib_default_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * area)3814 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3815 struct vm_area_struct *area)
3816 {
3817 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3818 if (!substream->ops->page &&
3819 !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
3820 return 0;
3821 /* mmap with fault handler */
3822 area->vm_ops = &snd_pcm_vm_ops_data_fault;
3823 return 0;
3824 }
3825 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3826
3827 /*
3828 * mmap the DMA buffer on I/O memory area
3829 */
3830 #if SNDRV_PCM_INFO_MMAP_IOMEM
3831 /**
3832 * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem
3833 * @substream: PCM substream
3834 * @area: VMA
3835 *
3836 * When your hardware uses the iomapped pages as the hardware buffer and
3837 * wants to mmap it, pass this function as mmap pcm_ops. Note that this
3838 * is supposed to work only on limited architectures.
3839 */
snd_pcm_lib_mmap_iomem(struct snd_pcm_substream * substream,struct vm_area_struct * area)3840 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3841 struct vm_area_struct *area)
3842 {
3843 struct snd_pcm_runtime *runtime = substream->runtime;
3844
3845 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3846 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3847 }
3848 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3849 #endif /* SNDRV_PCM_INFO_MMAP */
3850
3851 /*
3852 * mmap DMA buffer
3853 */
snd_pcm_mmap_data(struct snd_pcm_substream * substream,struct file * file,struct vm_area_struct * area)3854 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3855 struct vm_area_struct *area)
3856 {
3857 struct snd_pcm_runtime *runtime;
3858 long size;
3859 unsigned long offset;
3860 size_t dma_bytes;
3861 int err;
3862
3863 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3864 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3865 return -EINVAL;
3866 } else {
3867 if (!(area->vm_flags & VM_READ))
3868 return -EINVAL;
3869 }
3870 runtime = substream->runtime;
3871 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3872 return -EBADFD;
3873 if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3874 return -ENXIO;
3875 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3876 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3877 return -EINVAL;
3878 size = area->vm_end - area->vm_start;
3879 offset = area->vm_pgoff << PAGE_SHIFT;
3880 dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3881 if ((size_t)size > dma_bytes)
3882 return -EINVAL;
3883 if (offset > dma_bytes - size)
3884 return -EINVAL;
3885
3886 area->vm_ops = &snd_pcm_vm_ops_data;
3887 area->vm_private_data = substream;
3888 if (substream->ops->mmap)
3889 err = substream->ops->mmap(substream, area);
3890 else
3891 err = snd_pcm_lib_default_mmap(substream, area);
3892 if (!err)
3893 atomic_inc(&substream->mmap_count);
3894 return err;
3895 }
3896 EXPORT_SYMBOL(snd_pcm_mmap_data);
3897
snd_pcm_mmap(struct file * file,struct vm_area_struct * area)3898 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3899 {
3900 struct snd_pcm_file * pcm_file;
3901 struct snd_pcm_substream *substream;
3902 unsigned long offset;
3903
3904 pcm_file = file->private_data;
3905 substream = pcm_file->substream;
3906 if (PCM_RUNTIME_CHECK(substream))
3907 return -ENXIO;
3908 if (substream->runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3909 return -EBADFD;
3910
3911 offset = area->vm_pgoff << PAGE_SHIFT;
3912 switch (offset) {
3913 case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
3914 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3915 return -ENXIO;
3916 fallthrough;
3917 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
3918 if (!pcm_status_mmap_allowed(pcm_file))
3919 return -ENXIO;
3920 return snd_pcm_mmap_status(substream, file, area);
3921 case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
3922 if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
3923 return -ENXIO;
3924 fallthrough;
3925 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
3926 if (!pcm_control_mmap_allowed(pcm_file))
3927 return -ENXIO;
3928 return snd_pcm_mmap_control(substream, file, area);
3929 default:
3930 return snd_pcm_mmap_data(substream, file, area);
3931 }
3932 return 0;
3933 }
3934
snd_pcm_fasync(int fd,struct file * file,int on)3935 static int snd_pcm_fasync(int fd, struct file * file, int on)
3936 {
3937 struct snd_pcm_file * pcm_file;
3938 struct snd_pcm_substream *substream;
3939 struct snd_pcm_runtime *runtime;
3940
3941 pcm_file = file->private_data;
3942 substream = pcm_file->substream;
3943 if (PCM_RUNTIME_CHECK(substream))
3944 return -ENXIO;
3945 runtime = substream->runtime;
3946 if (runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
3947 return -EBADFD;
3948 return snd_fasync_helper(fd, file, on, &runtime->fasync);
3949 }
3950
3951 /*
3952 * ioctl32 compat
3953 */
3954 #ifdef CONFIG_COMPAT
3955 #include "pcm_compat.c"
3956 #else
3957 #define snd_pcm_ioctl_compat NULL
3958 #endif
3959
3960 /*
3961 * To be removed helpers to keep binary compatibility
3962 */
3963
3964 #ifdef CONFIG_SND_SUPPORT_OLD_API
3965 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3966 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3967
snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params * params,struct snd_pcm_hw_params_old * oparams)3968 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3969 struct snd_pcm_hw_params_old *oparams)
3970 {
3971 unsigned int i;
3972
3973 memset(params, 0, sizeof(*params));
3974 params->flags = oparams->flags;
3975 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3976 params->masks[i].bits[0] = oparams->masks[i];
3977 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3978 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3979 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3980 params->info = oparams->info;
3981 params->msbits = oparams->msbits;
3982 params->rate_num = oparams->rate_num;
3983 params->rate_den = oparams->rate_den;
3984 params->fifo_size = oparams->fifo_size;
3985 }
3986
snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old * oparams,struct snd_pcm_hw_params * params)3987 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3988 struct snd_pcm_hw_params *params)
3989 {
3990 unsigned int i;
3991
3992 memset(oparams, 0, sizeof(*oparams));
3993 oparams->flags = params->flags;
3994 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3995 oparams->masks[i] = params->masks[i].bits[0];
3996 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3997 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3998 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3999 oparams->info = params->info;
4000 oparams->msbits = params->msbits;
4001 oparams->rate_num = params->rate_num;
4002 oparams->rate_den = params->rate_den;
4003 oparams->fifo_size = params->fifo_size;
4004 }
4005
snd_pcm_hw_refine_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)4006 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
4007 struct snd_pcm_hw_params_old __user * _oparams)
4008 {
4009 struct snd_pcm_hw_params *params;
4010 struct snd_pcm_hw_params_old *oparams = NULL;
4011 int err;
4012
4013 params = kmalloc(sizeof(*params), GFP_KERNEL);
4014 if (!params)
4015 return -ENOMEM;
4016
4017 oparams = memdup_user(_oparams, sizeof(*oparams));
4018 if (IS_ERR(oparams)) {
4019 err = PTR_ERR(oparams);
4020 goto out;
4021 }
4022 snd_pcm_hw_convert_from_old_params(params, oparams);
4023 err = snd_pcm_hw_refine(substream, params);
4024 if (err < 0)
4025 goto out_old;
4026
4027 err = fixup_unreferenced_params(substream, params);
4028 if (err < 0)
4029 goto out_old;
4030
4031 snd_pcm_hw_convert_to_old_params(oparams, params);
4032 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4033 err = -EFAULT;
4034 out_old:
4035 kfree(oparams);
4036 out:
4037 kfree(params);
4038 return err;
4039 }
4040
snd_pcm_hw_params_old_user(struct snd_pcm_substream * substream,struct snd_pcm_hw_params_old __user * _oparams)4041 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
4042 struct snd_pcm_hw_params_old __user * _oparams)
4043 {
4044 struct snd_pcm_hw_params *params;
4045 struct snd_pcm_hw_params_old *oparams = NULL;
4046 int err;
4047
4048 params = kmalloc(sizeof(*params), GFP_KERNEL);
4049 if (!params)
4050 return -ENOMEM;
4051
4052 oparams = memdup_user(_oparams, sizeof(*oparams));
4053 if (IS_ERR(oparams)) {
4054 err = PTR_ERR(oparams);
4055 goto out;
4056 }
4057
4058 snd_pcm_hw_convert_from_old_params(params, oparams);
4059 err = snd_pcm_hw_params(substream, params);
4060 if (err < 0)
4061 goto out_old;
4062
4063 snd_pcm_hw_convert_to_old_params(oparams, params);
4064 if (copy_to_user(_oparams, oparams, sizeof(*oparams)))
4065 err = -EFAULT;
4066 out_old:
4067 kfree(oparams);
4068 out:
4069 kfree(params);
4070 return err;
4071 }
4072 #endif /* CONFIG_SND_SUPPORT_OLD_API */
4073
4074 #ifndef CONFIG_MMU
snd_pcm_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)4075 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
4076 unsigned long addr,
4077 unsigned long len,
4078 unsigned long pgoff,
4079 unsigned long flags)
4080 {
4081 struct snd_pcm_file *pcm_file = file->private_data;
4082 struct snd_pcm_substream *substream = pcm_file->substream;
4083 struct snd_pcm_runtime *runtime = substream->runtime;
4084 unsigned long offset = pgoff << PAGE_SHIFT;
4085
4086 switch (offset) {
4087 case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
4088 return (unsigned long)runtime->status;
4089 case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
4090 return (unsigned long)runtime->control;
4091 default:
4092 return (unsigned long)runtime->dma_area + offset;
4093 }
4094 }
4095 #else
4096 # define snd_pcm_get_unmapped_area NULL
4097 #endif
4098
4099 /*
4100 * Register section
4101 */
4102
4103 const struct file_operations snd_pcm_f_ops[2] = {
4104 {
4105 .owner = THIS_MODULE,
4106 .write = snd_pcm_write,
4107 .write_iter = snd_pcm_writev,
4108 .open = snd_pcm_playback_open,
4109 .release = snd_pcm_release,
4110 .llseek = no_llseek,
4111 .poll = snd_pcm_poll,
4112 .unlocked_ioctl = snd_pcm_ioctl,
4113 .compat_ioctl = snd_pcm_ioctl_compat,
4114 .mmap = snd_pcm_mmap,
4115 .fasync = snd_pcm_fasync,
4116 .get_unmapped_area = snd_pcm_get_unmapped_area,
4117 },
4118 {
4119 .owner = THIS_MODULE,
4120 .read = snd_pcm_read,
4121 .read_iter = snd_pcm_readv,
4122 .open = snd_pcm_capture_open,
4123 .release = snd_pcm_release,
4124 .llseek = no_llseek,
4125 .poll = snd_pcm_poll,
4126 .unlocked_ioctl = snd_pcm_ioctl,
4127 .compat_ioctl = snd_pcm_ioctl_compat,
4128 .mmap = snd_pcm_mmap,
4129 .fasync = snd_pcm_fasync,
4130 .get_unmapped_area = snd_pcm_get_unmapped_area,
4131 }
4132 };
4133