pcm_lib.c 60.1 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
/*
 *  Digital Audio (PCM) abstract layer
3
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds's avatar
Linus Torvalds committed
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 *                   Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/slab.h>
#include <linux/time.h>
25
#include <linux/math64.h>
Linus Torvalds's avatar
Linus Torvalds committed
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>

/*
 * fill ring buffer with silence
 * runtime->silence_start: starting pointer to silence area
 * runtime->silence_filled: size filled with silence
 * runtime->silence_threshold: threshold from application
 * runtime->silence_size: maximal size from application
 *
 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
 */
42
void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
Linus Torvalds's avatar
Linus Torvalds committed
43
{
44
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
45
46
47
48
49
50
51
52
53
54
55
56
57
58
	snd_pcm_uframes_t frames, ofs, transfer;

	if (runtime->silence_size < runtime->boundary) {
		snd_pcm_sframes_t noise_dist, n;
		if (runtime->silence_start != runtime->control->appl_ptr) {
			n = runtime->control->appl_ptr - runtime->silence_start;
			if (n < 0)
				n += runtime->boundary;
			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
				runtime->silence_filled -= n;
			else
				runtime->silence_filled = 0;
			runtime->silence_start = runtime->control->appl_ptr;
		}
Takashi Iwai's avatar
Takashi Iwai committed
59
		if (runtime->silence_filled >= runtime->buffer_size)
Linus Torvalds's avatar
Linus Torvalds committed
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
			return;
		noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
		if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
			return;
		frames = runtime->silence_threshold - noise_dist;
		if (frames > runtime->silence_size)
			frames = runtime->silence_size;
	} else {
		if (new_hw_ptr == ULONG_MAX) {	/* initialization */
			snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
			runtime->silence_filled = avail > 0 ? avail : 0;
			runtime->silence_start = (runtime->status->hw_ptr +
						  runtime->silence_filled) %
						 runtime->boundary;
		} else {
			ofs = runtime->status->hw_ptr;
			frames = new_hw_ptr - ofs;
			if ((snd_pcm_sframes_t)frames < 0)
				frames += runtime->boundary;
			runtime->silence_filled -= frames;
			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
				runtime->silence_filled = 0;
82
				runtime->silence_start = new_hw_ptr;
Linus Torvalds's avatar
Linus Torvalds committed
83
			} else {
84
				runtime->silence_start = ofs;
Linus Torvalds's avatar
Linus Torvalds committed
85
86
87
88
			}
		}
		frames = runtime->buffer_size - runtime->silence_filled;
	}
89
90
	if (snd_BUG_ON(frames > runtime->buffer_size))
		return;
Linus Torvalds's avatar
Linus Torvalds committed
91
92
	if (frames == 0)
		return;
93
	ofs = runtime->silence_start % runtime->buffer_size;
Linus Torvalds's avatar
Linus Torvalds committed
94
95
96
97
98
99
100
	while (frames > 0) {
		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
		if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
		    runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
			if (substream->ops->silence) {
				int err;
				err = substream->ops->silence(substream, -1, ofs, transfer);
101
				snd_BUG_ON(err < 0);
Linus Torvalds's avatar
Linus Torvalds committed
102
103
104
105
106
107
108
109
110
111
112
			} else {
				char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
				snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
			}
		} else {
			unsigned int c;
			unsigned int channels = runtime->channels;
			if (substream->ops->silence) {
				for (c = 0; c < channels; ++c) {
					int err;
					err = substream->ops->silence(substream, c, ofs, transfer);
113
					snd_BUG_ON(err < 0);
Linus Torvalds's avatar
Linus Torvalds committed
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
				}
			} else {
				size_t dma_csize = runtime->dma_bytes / channels;
				for (c = 0; c < channels; ++c) {
					char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
					snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
				}
			}
		}
		runtime->silence_filled += transfer;
		frames -= transfer;
		ofs = 0;
	}
}

129
130
131
132
133
134
135
136
137
138
static void pcm_debug_name(struct snd_pcm_substream *substream,
			   char *name, size_t len)
{
	snprintf(name, len, "pcmC%dD%d%c:%d",
		 substream->pcm->card->number,
		 substream->pcm->device,
		 substream->stream ? 'c' : 'p',
		 substream->number);
}

139
140
141
142
143
#define XRUN_DEBUG_BASIC	(1<<0)
#define XRUN_DEBUG_STACK	(1<<1)	/* dump also stack */
#define XRUN_DEBUG_JIFFIESCHECK	(1<<2)	/* do jiffies check */
#define XRUN_DEBUG_PERIODUPDATE	(1<<3)	/* full period update info */
#define XRUN_DEBUG_HWPTRUPDATE	(1<<4)	/* full hwptr update info */
144
145
#define XRUN_DEBUG_LOG		(1<<5)	/* show last 10 positions on err */
#define XRUN_DEBUG_LOGONCE	(1<<6)	/* do above only once */
146

Takashi Iwai's avatar
Takashi Iwai committed
147
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
148

149
150
#define xrun_debug(substream, mask) \
			((substream)->pstr->xrun_debug & (mask))
Takashi Iwai's avatar
Takashi Iwai committed
151

152
153
154
#define dump_stack_on_xrun(substream) do {			\
		if (xrun_debug(substream, XRUN_DEBUG_STACK))	\
			dump_stack();				\
Takashi Iwai's avatar
Takashi Iwai committed
155
156
	} while (0)

157
static void xrun(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
158
{
159
160
161
162
	struct snd_pcm_runtime *runtime = substream->runtime;

	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
163
	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
164
	if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
165
166
167
		char name[16];
		pcm_debug_name(substream, name, sizeof(name));
		snd_printd(KERN_DEBUG "XRUN: %s\n", name);
Takashi Iwai's avatar
Takashi Iwai committed
168
		dump_stack_on_xrun(substream);
Linus Torvalds's avatar
Linus Torvalds committed
169
170
171
	}
}

172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
#define hw_ptr_error(substream, fmt, args...)				\
	do {								\
		if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {		\
			if (printk_ratelimit()) {			\
				snd_printd("PCM: " fmt, ##args);	\
			}						\
			dump_stack_on_xrun(substream);			\
		}							\
	} while (0)

#define XRUN_LOG_CNT	10

struct hwptr_log_entry {
	unsigned long jiffies;
	snd_pcm_uframes_t pos;
	snd_pcm_uframes_t period_size;
	snd_pcm_uframes_t buffer_size;
	snd_pcm_uframes_t old_hw_ptr;
	snd_pcm_uframes_t hw_ptr_base;
	snd_pcm_uframes_t hw_ptr_interrupt;
};

struct snd_pcm_hwptr_log {
	unsigned int idx;
	unsigned int hit: 1;
	struct hwptr_log_entry entries[XRUN_LOG_CNT];
};

static void xrun_log(struct snd_pcm_substream *substream,
		     snd_pcm_uframes_t pos)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
	struct hwptr_log_entry *entry;

	if (log == NULL) {
		log = kzalloc(sizeof(*log), GFP_ATOMIC);
		if (log == NULL)
			return;
		runtime->hwptr_log = log;
	} else {
		if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
			return;
	}
	entry = &log->entries[log->idx];
	entry->jiffies = jiffies;
	entry->pos = pos;
	entry->period_size = runtime->period_size;
	entry->buffer_size = runtime->buffer_size;;
	entry->old_hw_ptr = runtime->status->hw_ptr;
	entry->hw_ptr_base = runtime->hw_ptr_base;
	entry->hw_ptr_interrupt = runtime->hw_ptr_interrupt;;
	log->idx = (log->idx + 1) % XRUN_LOG_CNT;
}

static void xrun_log_show(struct snd_pcm_substream *substream)
{
	struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
	struct hwptr_log_entry *entry;
	char name[16];
	unsigned int idx;
	int cnt;

	if (log == NULL)
		return;
	if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
		return;
	pcm_debug_name(substream, name, sizeof(name));
	for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
		entry = &log->entries[idx];
		if (entry->period_size == 0)
			break;
		snd_printd("hwptr log: %s: j=%lu, pos=0x%lx/0x%lx/0x%lx, "
			   "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
			   name, entry->jiffies, (unsigned long)entry->pos,
			   (unsigned long)entry->period_size,
			   (unsigned long)entry->buffer_size,
			   (unsigned long)entry->old_hw_ptr,
			   (unsigned long)entry->hw_ptr_base,
			   (unsigned long)entry->hw_ptr_interrupt);
		idx++;
		idx %= XRUN_LOG_CNT;
	}
	log->hit = 1;
}

#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */

#define xrun_debug(substream, mask)	0
#define xrun(substream)			do { } while (0)
#define hw_ptr_error(substream, fmt, args...) do { } while (0)
#define xrun_log(substream, pos)	do { } while (0)
#define xrun_log_show(substream)	do { } while (0)

#endif

268
269
270
static snd_pcm_uframes_t
snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
			  struct snd_pcm_runtime *runtime)
Linus Torvalds's avatar
Linus Torvalds committed
271
272
273
274
275
276
277
{
	snd_pcm_uframes_t pos;

	pos = substream->ops->pointer(substream);
	if (pos == SNDRV_PCM_POS_XRUN)
		return pos; /* XRUN */
	if (pos >= runtime->buffer_size) {
278
		if (printk_ratelimit()) {
279
280
			char name[16];
			pcm_debug_name(substream, name, sizeof(name));
281
			xrun_log_show(substream);
282
			snd_printd(KERN_ERR  "BUG: %s, pos = 0x%lx, "
283
				   "buffer size = 0x%lx, period size = 0x%lx\n",
284
				   name, pos, runtime->buffer_size,
285
286
287
				   runtime->period_size);
		}
		pos = 0;
288
	}
Linus Torvalds's avatar
Linus Torvalds committed
289
	pos -= pos % runtime->min_align;
290
291
	if (xrun_debug(substream, XRUN_DEBUG_LOG))
		xrun_log(substream, pos);
Linus Torvalds's avatar
Linus Torvalds committed
292
293
294
	return pos;
}

295
296
static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
				      struct snd_pcm_runtime *runtime)
Linus Torvalds's avatar
Linus Torvalds committed
297
298
299
300
301
302
303
304
305
{
	snd_pcm_uframes_t avail;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		avail = snd_pcm_playback_avail(runtime);
	else
		avail = snd_pcm_capture_avail(runtime);
	if (avail > runtime->avail_max)
		runtime->avail_max = avail;
306
307
	if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
		if (avail >= runtime->buffer_size) {
Linus Torvalds's avatar
Linus Torvalds committed
308
			snd_pcm_drain_done(substream);
309
310
311
312
			return -EPIPE;
		}
	} else {
		if (avail >= runtime->stop_threshold) {
Linus Torvalds's avatar
Linus Torvalds committed
313
			xrun(substream);
314
315
			return -EPIPE;
		}
Linus Torvalds's avatar
Linus Torvalds committed
316
317
318
319
320
321
	}
	if (avail >= runtime->control->avail_min)
		wake_up(&runtime->sleep);
	return 0;
}

322
static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
323
{
324
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
325
	snd_pcm_uframes_t pos;
326
327
328
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
	snd_pcm_sframes_t hdelta, delta;
	unsigned long jdelta;
Linus Torvalds's avatar
Linus Torvalds committed
329

330
	old_hw_ptr = runtime->status->hw_ptr;
Linus Torvalds's avatar
Linus Torvalds committed
331
332
333
334
335
	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
336
	if (xrun_debug(substream, XRUN_DEBUG_PERIODUPDATE)) {
337
338
339
340
		char name[16];
		pcm_debug_name(substream, name, sizeof(name));
		snd_printd("period_update: %s: pos=0x%x/0x%x/0x%x, "
			   "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
341
342
343
344
345
346
			   name, (unsigned int)pos,
			   (unsigned int)runtime->period_size,
			   (unsigned int)runtime->buffer_size,
			   (unsigned long)old_hw_ptr,
			   (unsigned long)runtime->hw_ptr_base,
			   (unsigned long)runtime->hw_ptr_interrupt);
347
	}
Takashi Iwai's avatar
Takashi Iwai committed
348
349
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
Linus Torvalds's avatar
Linus Torvalds committed
350
	hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
Takashi Iwai's avatar
Takashi Iwai committed
351
	delta = new_hw_ptr - hw_ptr_interrupt;
352
	if (hw_ptr_interrupt >= runtime->boundary) {
353
354
355
		hw_ptr_interrupt -= runtime->boundary;
		if (hw_base < runtime->boundary / 2)
			/* hw_base was already lapped; recalc delta */
356
357
			delta = new_hw_ptr - hw_ptr_interrupt;
	}
Takashi Iwai's avatar
Takashi Iwai committed
358
	if (delta < 0) {
359
		if (runtime->periods == 1 || new_hw_ptr < old_hw_ptr)
360
			delta += runtime->buffer_size;
Takashi Iwai's avatar
Takashi Iwai committed
361
		if (delta < 0) {
362
			xrun_log_show(substream);
Takashi Iwai's avatar
Takashi Iwai committed
363
364
365
366
367
			hw_ptr_error(substream, 
				     "Unexpected hw_pointer value "
				     "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
				     substream->stream, (long)pos,
				     (long)hw_ptr_interrupt);
368
369
370
371
372
373
374
#if 1
			/* simply skipping the hwptr update seems more
			 * robust in some cases, e.g. on VMware with
			 * inaccurate timer source
			 */
			return 0; /* skip this update */
#else
Takashi Iwai's avatar
Takashi Iwai committed
375
376
			/* rebase to interrupt position */
			hw_base = new_hw_ptr = hw_ptr_interrupt;
377
378
			/* align hw_base to buffer_size */
			hw_base -= hw_base % runtime->buffer_size;
Takashi Iwai's avatar
Takashi Iwai committed
379
			delta = 0;
380
#endif
Takashi Iwai's avatar
Takashi Iwai committed
381
382
		} else {
			hw_base += runtime->buffer_size;
383
			if (hw_base >= runtime->boundary)
Takashi Iwai's avatar
Takashi Iwai committed
384
385
				hw_base = 0;
			new_hw_ptr = hw_base + pos;
Linus Torvalds's avatar
Linus Torvalds committed
386
387
		}
	}
388
389

	/* Do jiffies check only in xrun_debug mode */
390
	if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
391
392
		goto no_jiffies_check;

393
394
395
396
397
398
	/* Skip the jiffies check for hardwares with BATCH flag.
	 * Such hardware usually just increases the position at each IRQ,
	 * thus it can't give any strange position.
	 */
	if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
		goto no_jiffies_check;
399
	hdelta = new_hw_ptr - old_hw_ptr;
400
401
402
	if (hdelta < runtime->delay)
		goto no_jiffies_check;
	hdelta -= runtime->delay;
403
404
405
406
407
	jdelta = jiffies - runtime->hw_ptr_jiffies;
	if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
		delta = jdelta /
			(((runtime->period_size * HZ) / runtime->rate)
								+ HZ/100);
408
		xrun_log_show(substream);
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
		hw_ptr_error(substream,
			     "hw_ptr skipping! [Q] "
			     "(pos=%ld, delta=%ld, period=%ld, "
			     "jdelta=%lu/%lu/%lu)\n",
			     (long)pos, (long)hdelta,
			     (long)runtime->period_size, jdelta,
			     ((hdelta * HZ) / runtime->rate), delta);
		hw_ptr_interrupt = runtime->hw_ptr_interrupt +
				   runtime->period_size * delta;
		if (hw_ptr_interrupt >= runtime->boundary)
			hw_ptr_interrupt -= runtime->boundary;
		/* rebase to interrupt position */
		hw_base = new_hw_ptr = hw_ptr_interrupt;
		/* align hw_base to buffer_size */
		hw_base -= hw_base % runtime->buffer_size;
		delta = 0;
	}
426
 no_jiffies_check:
427
	if (delta > runtime->period_size + runtime->period_size / 2) {
428
		xrun_log_show(substream);
Takashi Iwai's avatar
Takashi Iwai committed
429
430
431
432
433
434
435
436
437
		hw_ptr_error(substream,
			     "Lost interrupts? "
			     "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
			     substream->stream, (long)delta,
			     (long)hw_ptr_interrupt);
		/* rebase hw_ptr_interrupt */
		hw_ptr_interrupt =
			new_hw_ptr - new_hw_ptr % runtime->period_size;
	}
438
439
	runtime->hw_ptr_interrupt = hw_ptr_interrupt;

Linus Torvalds's avatar
Linus Torvalds committed
440
441
442
443
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

444
445
446
	if (runtime->status->hw_ptr == new_hw_ptr)
		return 0;

Takashi Iwai's avatar
Takashi Iwai committed
447
	runtime->hw_ptr_base = hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
448
	runtime->status->hw_ptr = new_hw_ptr;
449
	runtime->hw_ptr_jiffies = jiffies;
450
451
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
452
453
454
455
456

	return snd_pcm_update_hw_ptr_post(substream, runtime);
}

/* CAUTION: call it with irq disabled */
457
int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
458
{
459
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
460
	snd_pcm_uframes_t pos;
Takashi Iwai's avatar
Takashi Iwai committed
461
	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
462
	snd_pcm_sframes_t delta;
463
	unsigned long jdelta;
Linus Torvalds's avatar
Linus Torvalds committed
464
465
466
467
468
469
470

	old_hw_ptr = runtime->status->hw_ptr;
	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
	if (pos == SNDRV_PCM_POS_XRUN) {
		xrun(substream);
		return -EPIPE;
	}
471
	if (xrun_debug(substream, XRUN_DEBUG_HWPTRUPDATE)) {
472
473
474
475
		char name[16];
		pcm_debug_name(substream, name, sizeof(name));
		snd_printd("hw_update: %s: pos=0x%x/0x%x/0x%x, "
			   "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
476
477
478
479
480
481
			   name, (unsigned int)pos,
			   (unsigned int)runtime->period_size,
			   (unsigned int)runtime->buffer_size,
			   (unsigned long)old_hw_ptr,
			   (unsigned long)runtime->hw_ptr_base,
			   (unsigned long)runtime->hw_ptr_interrupt);
482
483
	}

Takashi Iwai's avatar
Takashi Iwai committed
484
485
	hw_base = runtime->hw_ptr_base;
	new_hw_ptr = hw_base + pos;
Linus Torvalds's avatar
Linus Torvalds committed
486

Takashi Iwai's avatar
Takashi Iwai committed
487
	delta = new_hw_ptr - old_hw_ptr;
488
	jdelta = jiffies - runtime->hw_ptr_jiffies;
Takashi Iwai's avatar
Takashi Iwai committed
489
490
491
	if (delta < 0) {
		delta += runtime->buffer_size;
		if (delta < 0) {
492
			xrun_log_show(substream);
Takashi Iwai's avatar
Takashi Iwai committed
493
494
			hw_ptr_error(substream, 
				     "Unexpected hw_pointer value [2] "
495
				     "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
Takashi Iwai's avatar
Takashi Iwai committed
496
				     substream->stream, (long)pos,
497
				     (long)old_hw_ptr, jdelta);
Linus Torvalds's avatar
Linus Torvalds committed
498
499
			return 0;
		}
Takashi Iwai's avatar
Takashi Iwai committed
500
		hw_base += runtime->buffer_size;
501
		if (hw_base >= runtime->boundary)
Takashi Iwai's avatar
Takashi Iwai committed
502
503
504
			hw_base = 0;
		new_hw_ptr = hw_base + pos;
	}
505
	/* Do jiffies check only in xrun_debug mode */
506
	if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
507
508
509
510
511
		goto no_jiffies_check;
	if (delta < runtime->delay)
		goto no_jiffies_check;
	delta -= runtime->delay;
	if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
512
		xrun_log_show(substream);
Takashi Iwai's avatar
Takashi Iwai committed
513
514
		hw_ptr_error(substream,
			     "hw_ptr skipping! "
515
			     "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
Takashi Iwai's avatar
Takashi Iwai committed
516
			     (long)pos, (long)delta,
517
518
			     (long)runtime->period_size, jdelta,
			     ((delta * HZ) / runtime->rate));
Takashi Iwai's avatar
Takashi Iwai committed
519
		return 0;
Linus Torvalds's avatar
Linus Torvalds committed
520
	}
521
 no_jiffies_check:
Linus Torvalds's avatar
Linus Torvalds committed
522
523
524
525
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
	    runtime->silence_size > 0)
		snd_pcm_playback_silence(substream, new_hw_ptr);

526
	if (runtime->status->hw_ptr == new_hw_ptr)
527
528
		return 0;

Takashi Iwai's avatar
Takashi Iwai committed
529
	runtime->hw_ptr_base = hw_base;
Linus Torvalds's avatar
Linus Torvalds committed
530
	runtime->status->hw_ptr = new_hw_ptr;
531
	runtime->hw_ptr_jiffies = jiffies;
532
533
	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
Linus Torvalds's avatar
Linus Torvalds committed
534
535
536
537
538
539
540
541
542
543
544
545

	return snd_pcm_update_hw_ptr_post(substream, runtime);
}

/**
 * snd_pcm_set_ops - set the PCM operators
 * @pcm: the pcm instance
 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 * @ops: the operator table
 *
 * Sets the given PCM operators to the pcm instance.
 */
546
void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
Linus Torvalds's avatar
Linus Torvalds committed
547
{
548
549
	struct snd_pcm_str *stream = &pcm->streams[direction];
	struct snd_pcm_substream *substream;
Linus Torvalds's avatar
Linus Torvalds committed
550
551
552
553
554
	
	for (substream = stream->substream; substream != NULL; substream = substream->next)
		substream->ops = ops;
}

555
EXPORT_SYMBOL(snd_pcm_set_ops);
Linus Torvalds's avatar
Linus Torvalds committed
556
557
558
559
560
561
562

/**
 * snd_pcm_sync - set the PCM sync id
 * @substream: the pcm substream
 *
 * Sets the PCM sync identifier for the card.
 */
563
void snd_pcm_set_sync(struct snd_pcm_substream *substream)
Linus Torvalds's avatar
Linus Torvalds committed
564
{
565
	struct snd_pcm_runtime *runtime = substream->runtime;
Linus Torvalds's avatar
Linus Torvalds committed
566
567
568
569
570
571
572
	
	runtime->sync.id32[0] = substream->pcm->card->number;
	runtime->sync.id32[1] = -1;
	runtime->sync.id32[2] = -1;
	runtime->sync.id32[3] = -1;
}

573
574
EXPORT_SYMBOL(snd_pcm_set_sync);

Linus Torvalds's avatar
Linus Torvalds committed
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
/*
 *  Standard ioctl routine
 */

static inline unsigned int div32(unsigned int a, unsigned int b, 
				 unsigned int *r)
{
	if (b == 0) {
		*r = 0;
		return UINT_MAX;
	}
	*r = a % b;
	return a / b;
}

static inline unsigned int div_down(unsigned int a, unsigned int b)
{
	if (b == 0)
		return UINT_MAX;
	return a / b;
}

static inline unsigned int div_up(unsigned int a, unsigned int b)
{
	unsigned int r;
	unsigned int q;
	if (b == 0)
		return UINT_MAX;
	q = div32(a, b, &r);
	if (r)
		++q;
	return q;
}

static inline unsigned int mul(unsigned int a, unsigned int b)
{
	if (a == 0)
		return 0;
	if (div_down(UINT_MAX, a) < b)
		return UINT_MAX;
	return a * b;
}

static inline unsigned int muldiv32(unsigned int a, unsigned int b,
				    unsigned int c, unsigned int *r)
{
	u_int64_t n = (u_int64_t) a * b;
	if (c == 0) {
623
		snd_BUG_ON(!n);
Linus Torvalds's avatar
Linus Torvalds committed
624
625
626
		*r = 0;
		return UINT_MAX;
	}
627
	n = div_u64_rem(n, c, r);
Linus Torvalds's avatar
Linus Torvalds committed
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
	if (n >= UINT_MAX) {
		*r = 0;
		return UINT_MAX;
	}
	return n;
}

/**
 * snd_interval_refine - refine the interval value of configurator
 * @i: the interval value to refine
 * @v: the interval value to refer to
 *
 * Refines the interval value with the reference value.
 * The interval is changed to the range satisfying both intervals.
 * The interval status (min, max, integer, etc.) are evaluated.
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
646
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
Linus Torvalds's avatar
Linus Torvalds committed
647
648
{
	int changed = 0;
649
650
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
	if (i->min < v->min) {
		i->min = v->min;
		i->openmin = v->openmin;
		changed = 1;
	} else if (i->min == v->min && !i->openmin && v->openmin) {
		i->openmin = 1;
		changed = 1;
	}
	if (i->max > v->max) {
		i->max = v->max;
		i->openmax = v->openmax;
		changed = 1;
	} else if (i->max == v->max && !i->openmax && v->openmax) {
		i->openmax = 1;
		changed = 1;
	}
	if (!i->integer && v->integer) {
		i->integer = 1;
		changed = 1;
	}
	if (i->integer) {
		if (i->openmin) {
			i->min++;
			i->openmin = 0;
		}
		if (i->openmax) {
			i->max--;
			i->openmax = 0;
		}
	} else if (!i->openmin && !i->openmax && i->min == i->max)
		i->integer = 1;
	if (snd_interval_checkempty(i)) {
		snd_interval_none(i);
		return -EINVAL;
	}
	return changed;
}

689
690
EXPORT_SYMBOL(snd_interval_refine);

691
static int snd_interval_refine_first(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
692
{
693
694
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
695
696
697
698
699
700
701
702
703
	if (snd_interval_single(i))
		return 0;
	i->max = i->min;
	i->openmax = i->openmin;
	if (i->openmax)
		i->max++;
	return 1;
}

704
static int snd_interval_refine_last(struct snd_interval *i)
Linus Torvalds's avatar
Linus Torvalds committed
705
{
706
707
	if (snd_BUG_ON(snd_interval_empty(i)))
		return -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
708
709
710
711
712
713
714
715
716
	if (snd_interval_single(i))
		return 0;
	i->min = i->max;
	i->openmin = i->openmax;
	if (i->openmin)
		i->min--;
	return 1;
}

717
void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
{
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = mul(a->min, b->min);
	c->openmin = (a->openmin || b->openmin);
	c->max = mul(a->max,  b->max);
	c->openmax = (a->openmax || b->openmax);
	c->integer = (a->integer && b->integer);
}

/**
 * snd_interval_div - refine the interval value with division
Takashi Iwai's avatar
Takashi Iwai committed
733
734
735
 * @a: dividend
 * @b: divisor
 * @c: quotient
Linus Torvalds's avatar
Linus Torvalds committed
736
737
738
739
740
 *
 * c = a / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
741
void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = div32(a->min, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = div32(a->max, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/**
 * snd_interval_muldivk - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
767
768
769
770
771
 * @a: dividend 1
 * @b: dividend 2
 * @k: divisor (as integer)
 * @c: result
  *
Linus Torvalds's avatar
Linus Torvalds committed
772
773
774
775
 * c = a * b / k
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
776
777
void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
		      unsigned int k, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, b->min, k, &r);
	c->openmin = (r || a->openmin || b->openmin);
	c->max = muldiv32(a->max, b->max, k, &r);
	if (r) {
		c->max++;
		c->openmax = 1;
	} else
		c->openmax = (a->openmax || b->openmax);
	c->integer = 0;
}

/**
 * snd_interval_mulkdiv - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
798
799
800
801
 * @a: dividend 1
 * @k: dividend 2 (as integer)
 * @b: divisor
 * @c: result
Linus Torvalds's avatar
Linus Torvalds committed
802
803
804
805
806
 *
 * c = a * k / b
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
807
808
void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
		      const struct snd_interval *b, struct snd_interval *c)
Linus Torvalds's avatar
Linus Torvalds committed
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
{
	unsigned int r;
	if (a->empty || b->empty) {
		snd_interval_none(c);
		return;
	}
	c->empty = 0;
	c->min = muldiv32(a->min, k, b->max, &r);
	c->openmin = (r || a->openmin || b->openmax);
	if (b->min > 0) {
		c->max = muldiv32(a->max, k, b->min, &r);
		if (r) {
			c->max++;
			c->openmax = 1;
		} else
			c->openmax = (a->openmax || b->openmin);
	} else {
		c->max = UINT_MAX;
		c->openmax = 0;
	}
	c->integer = 0;
}

/* ---- */


/**
 * snd_interval_ratnum - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
837
838
839
840
841
 * @i: interval to refine
 * @rats_count: number of ratnum_t 
 * @rats: ratnum_t array
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
Linus Torvalds's avatar
Linus Torvalds committed
842
843
844
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
845
846
847
int snd_interval_ratnum(struct snd_interval *i,
			unsigned int rats_count, struct snd_ratnum *rats,
			unsigned int *nump, unsigned int *denp)
Linus Torvalds's avatar
Linus Torvalds committed
848
849
850
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
851
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
	int err;

	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->min;
		int diff;
		if (q == 0)
			q = 1;
		den = div_down(num, q);
		if (den < rats[k].den_min)
			continue;
		if (den > rats[k].den_max)
			den = rats[k].den_max;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den -= r;
		}
		diff = num - q * den;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num = rats[k].num;
		unsigned int den;
		unsigned int q = i->max;
		int diff;
		if (q == 0) {
			i->empty = 1;
			return -EINVAL;
		}
		den = div_up(num, q);
		if (den > rats[k].den_max)
			continue;
		if (den < rats[k].den_min)
			den = rats[k].den_min;
		else {
			unsigned int r;
			r = (den - rats[k].den_min) % rats[k].den_step;
			if (r != 0)
				den += rats[k].den_step - r;
		}
		diff = q * den - num;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.max = div_up(best_num, best_den);
	t.openmax = !!(best_num % best_den);
	t.integer = 0;
	err = snd_interval_refine(i, &t);
	if (err < 0)
		return err;

	if (snd_interval_single(i)) {
		if (nump)
			*nump = best_num;
		if (denp)
			*denp = best_den;
	}
	return err;
}

937
938
EXPORT_SYMBOL(snd_interval_ratnum);

Linus Torvalds's avatar
Linus Torvalds committed
939
940
/**
 * snd_interval_ratden - refine the interval value
Takashi Iwai's avatar
Takashi Iwai committed
941
 * @i: interval to refine
942
943
 * @rats_count: number of struct ratden
 * @rats: struct ratden array
Takashi Iwai's avatar
Takashi Iwai committed
944
945
 * @nump: pointer to store the resultant numerator
 * @denp: pointer to store the resultant denominator
Linus Torvalds's avatar
Linus Torvalds committed
946
947
948
 *
 * Returns non-zero if the value is changed, zero if not changed.
 */
949
950
static int snd_interval_ratden(struct snd_interval *i,
			       unsigned int rats_count, struct snd_ratden *rats,
Linus Torvalds's avatar
Linus Torvalds committed
951
952
953
954
			       unsigned int *nump, unsigned int *denp)
{
	unsigned int best_num, best_diff, best_den;
	unsigned int k;
955
	struct snd_interval t;
Linus Torvalds's avatar
Linus Torvalds committed
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
	int err;

	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->min;
		int diff;
		num = mul(q, den);
		if (num > rats[k].num_max)
			continue;
		if (num < rats[k].num_min)
			num = rats[k].num_max;
		else {
			unsigned int r;
			r = (num - rats[k].num_min) % rats[k].num_step;
			if (r != 0)
				num += rats[k].num_step - r;
		}
		diff = num - q * den;
		if (best_num == 0 ||
		    diff * best_den < best_diff * den) {
			best_diff = diff;
			best_den = den;
			best_num = num;
		}
	}
	if (best_den == 0) {
		i->empty = 1;
		return -EINVAL;
	}
	t.min = div_down(best_num, best_den);
	t.openmin = !!(best_num % best_den);
	
	best_num = best_den = best_diff = 0;
	for (k = 0; k < rats_count; ++k) {
		unsigned int num;
		unsigned int den = rats[k].den;
		unsigned int q = i->max;
		int diff;
		num = mul(q, den);
		if (num < rats[k].num_min)
			continue;
		if (num > rats[k].num_max)
			num = rats[k].num_max;