summaryrefslogtreecommitdiff
path: root/sound/drivers/pcm-indirect2.c
blob: 3c93c23e4883f602a9928f9dacec9de414e92682 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
/*
 * Helper functions for indirect PCM data transfer to a simple FIFO in
 * hardware (small, no possibility to read "hardware io position",
 * updating position done by interrupt, ...)
 *
 *  Copyright (c) by 2007  Joachim Foerster <JOFT@gmx.de>
 *
 *  Based on "pcm-indirect.h" (alsa-driver-1.0.13) by
 *
 *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
 *                   Jaroslav Kysela <perex@suse.cz>
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* snd_printk/d() */
#include <sound/core.h>
/* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t
 * snd_pcm_period_elapsed() */
#include <sound/pcm.h>

#include "pcm-indirect2.h"

#ifdef SND_PCM_INDIRECT2_STAT
/* jiffies */
#include <linux/jiffies.h>

void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
			    struct snd_pcm_indirect2 *rec)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int i;
	int j;
	int k;
	int seconds = (rec->lastbytetime - rec->firstbytetime) / HZ;

	snd_printk(KERN_DEBUG "STAT: mul_elapsed: %u, mul_elapsed_real: %d, "
		   "irq_occured: %d\n",
		   rec->mul_elapsed, rec->mul_elapsed_real, rec->irq_occured);
	snd_printk(KERN_DEBUG "STAT: min_multiple: %d (irqs/period)\n",
		   rec->min_multiple);
	snd_printk(KERN_DEBUG "STAT: firstbytetime: %lu, lastbytetime: %lu, "
		   "firstzerotime: %lu\n",
		 rec->firstbytetime, rec->lastbytetime, rec->firstzerotime);
	snd_printk(KERN_DEBUG "STAT: bytes2hw: %u Bytes => (by runtime->rate) "
		   "length: %d s\n",
		 rec->bytes2hw, rec->bytes2hw / 2 / 2 / runtime->rate);
	snd_printk(KERN_DEBUG "STAT: (by measurement) length: %d => "
		   "rate: %d Bytes/s = %d Frames/s|Hz\n",
		   seconds, rec->bytes2hw / seconds,
		   rec->bytes2hw / 2 / 2 / seconds);
	snd_printk(KERN_DEBUG
		   "STAT: zeros2hw: %u = %d ms ~ %d * %d zero copies\n",
		   rec->zeros2hw, ((rec->zeros2hw / 2 / 2) * 1000) /
		   runtime->rate,
		   rec->zeros2hw / (rec->hw_buffer_size / 2),
		   (rec->hw_buffer_size / 2));
	snd_printk(KERN_DEBUG "STAT: pointer_calls: %u, lastdifftime: %u\n",
		   rec->pointer_calls, rec->lastdifftime);
	snd_printk(KERN_DEBUG "STAT: sw_io: %d, sw_data: %d\n", rec->sw_io,
		   rec->sw_data);
	snd_printk(KERN_DEBUG "STAT: byte_sizes[]:\n");
	k = 0;
	for (j = 0; j < 8; j++) {
		for (i = j * 8; i < (j + 1) * 8; i++)
			if (rec->byte_sizes[i] != 0) {
				snd_printk(KERN_DEBUG "%u: %u",
					   i, rec->byte_sizes[i]);
				k++;
			}
		if (((k % 8) == 0) && (k != 0)) {
			snd_printk(KERN_DEBUG "\n");
			k = 0;
		}
	}
	snd_printk(KERN_DEBUG "\n");
	snd_printk(KERN_DEBUG "STAT: zero_sizes[]:\n");
	for (j = 0; j < 8; j++) {
		k = 0;
		for (i = j * 8; i < (j + 1) * 8; i++)
			if (rec->zero_sizes[i] != 0)
				snd_printk(KERN_DEBUG "%u: %u",
					   i, rec->zero_sizes[i]);
			else
				k++;
		if (!k)
			snd_printk(KERN_DEBUG "\n");
	}
	snd_printk(KERN_DEBUG "\n");
	snd_printk(KERN_DEBUG "STAT: min_adds[]:\n");
	for (j = 0; j < 8; j++) {
		if (rec->min_adds[j] != 0)
			snd_printk(KERN_DEBUG "%u: %u", j, rec->min_adds[j]);
	}
	snd_printk(KERN_DEBUG "\n");
	snd_printk(KERN_DEBUG "STAT: mul_adds[]:\n");
	for (j = 0; j < 8; j++) {
		if (rec->mul_adds[j] != 0)
			snd_printk(KERN_DEBUG "%u: %u", j, rec->mul_adds[j]);
	}
	snd_printk(KERN_DEBUG "\n");
	snd_printk(KERN_DEBUG
		   "STAT: zero_times_saved: %d, zero_times_notsaved: %d\n",
		   rec->zero_times_saved, rec->zero_times_notsaved);
	/* snd_printk(KERN_DEBUG "STAT: zero_times[]\n");
	i = 0;
	for (j = 0; j < 3750; j++) {
		if (rec->zero_times[j] != 0) {
			snd_printk(KERN_DEBUG "%u: %u", j, rec->zero_times[j]);
			i++;
		}
		if (((i % 8) == 0) && (i != 0))
			snd_printk(KERN_DEBUG "\n");
	}
	snd_printk(KERN_DEBUG "\n"); */
	return;
}
#endif

/*
 * _internal_ helper function for playback/capture transfer function
 */
static void
snd_pcm_indirect2_increase_min_periods(struct snd_pcm_substream *substream,
				       struct snd_pcm_indirect2 *rec,
				       int isplay, int iscopy,
				       unsigned int bytes)
{
	if (rec->min_periods >= 0) {
		if (iscopy) {
			rec->sw_io += bytes;
			if (rec->sw_io >= rec->sw_buffer_size)
				rec->sw_io -= rec->sw_buffer_size;
		} else if (isplay) {
			/* If application does not write data in multiples of
			 * a period, move sw_data to the next correctly aligned
			 * position, so that sw_io can converge to it (in the
			 * next step).
			 */
			if (!rec->check_alignment) {
				if (rec->bytes2hw %
				    snd_pcm_lib_period_bytes(substream)) {
					unsigned bytes2hw_aligned =
					    (1 +
					     (rec->bytes2hw /
					      snd_pcm_lib_period_bytes
					      (substream))) *
					    snd_pcm_lib_period_bytes
					    (substream);
					rec->sw_data =
					    bytes2hw_aligned %
					    rec->sw_buffer_size;
#ifdef SND_PCM_INDIRECT2_STAT
					snd_printk(KERN_DEBUG
						   "STAT: @re-align: aligned "
						   "bytes2hw to next period "
						   "size boundary: %d "
						   "(instead of %d)\n",
						   bytes2hw_aligned,
						   rec->bytes2hw);
					snd_printk(KERN_DEBUG
						   "STAT: @re-align: sw_data "
						   "moves to: %d\n",
						   rec->sw_data);
#endif
				}
				rec->check_alignment = 1;
			}
			/* We are at the end and are copying zeros into the
			 * fifo.
			 * Now, we have to make sure that sw_io is increased
			 * until the position of sw_data: Filling the fifo with
			 * the first zeros means, the last bytes were played.
			 */
			if (rec->sw_io != rec->sw_data) {
				unsigned int diff;
				if (rec->sw_data > rec->sw_io)
					diff = rec->sw_data - rec->sw_io;
				else
					diff = (rec->sw_buffer_size -
						rec->sw_io) +
						rec->sw_data;
				if (bytes >= diff)
					rec->sw_io = rec->sw_data;
				else {
					rec->sw_io += bytes;
					if (rec->sw_io >= rec->sw_buffer_size)
						rec->sw_io -=
						    rec->sw_buffer_size;
				}
			}
		}
		rec->min_period_count += bytes;
		if (rec->min_period_count >= (rec->hw_buffer_size / 2)) {
			rec->min_periods += (rec->min_period_count /
					     (rec->hw_buffer_size / 2));
#ifdef SND_PCM_INDIRECT2_STAT
			if ((rec->min_period_count /
			     (rec->hw_buffer_size / 2)) > 7)
				snd_printk(KERN_DEBUG
					   "STAT: more than 7 (%d) min_adds "
					   "at once - too big to save!\n",
					   (rec->min_period_count /
					    (rec->hw_buffer_size / 2)));
			else
				rec->min_adds[(rec->min_period_count /
					       (rec->hw_buffer_size / 2))]++;
#endif
			rec->min_period_count = (rec->min_period_count %
						 (rec->hw_buffer_size / 2));
		}
	} else if (isplay && iscopy)
		rec->min_periods = 0;
}

/*
 * helper function for playback/capture pointer callback
 */
snd_pcm_uframes_t
snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
			  struct snd_pcm_indirect2 *rec)
{
#ifdef SND_PCM_INDIRECT2_STAT
	rec->pointer_calls++;
#endif
	return bytes_to_frames(substream->runtime, rec->sw_io);
}

/*
 * _internal_ helper function for playback interrupt callback
 */
static void
snd_pcm_indirect2_playback_transfer(struct snd_pcm_substream *substream,
				    struct snd_pcm_indirect2 *rec,
				    snd_pcm_indirect2_copy_t copy,
				    snd_pcm_indirect2_zero_t zero)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;

	/* runtime->control->appl_ptr: position where ALSA will write next time
	 * rec->appl_ptr: position where ALSA was last time
	 * diff: obviously ALSA wrote that much bytes into the intermediate
	 * buffer since we checked last time
	 */
	snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;

	if (diff) {
#ifdef SND_PCM_INDIRECT2_STAT
		rec->lastdifftime = jiffies;
#endif
		if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
			diff += runtime->boundary;
		/* number of bytes "added" by ALSA increases the number of
		 * bytes which are ready to "be transfered to HW"/"played"
		 * Then, set rec->appl_ptr to not count bytes twice next time.
		 */
		rec->sw_ready += (int)frames_to_bytes(runtime, diff);
		rec->appl_ptr = appl_ptr;
	}
	if (rec->hw_ready && (rec->sw_ready <= 0)) {
		unsigned int bytes;

#ifdef SND_PCM_INDIRECT2_STAT
		if (rec->firstzerotime == 0) {
			rec->firstzerotime = jiffies;
			snd_printk(KERN_DEBUG
				   "STAT: @firstzerotime: mul_elapsed: %d, "
				   "min_period_count: %d\n",
				   rec->mul_elapsed, rec->min_period_count);
			snd_printk(KERN_DEBUG
				   "STAT: @firstzerotime: sw_io: %d, "
				   "sw_data: %d, appl_ptr: %u\n",
				   rec->sw_io, rec->sw_data,
				   (unsigned int)appl_ptr);
		}
		if ((jiffies - rec->firstzerotime) < 3750) {
			rec->zero_times[(jiffies - rec->firstzerotime)]++;
			rec->zero_times_saved++;
		} else
			rec->zero_times_notsaved++;
#endif
		bytes = zero(substream, rec);

#ifdef SND_PCM_INDIRECT2_STAT
		rec->zeros2hw += bytes;
		if (bytes < 64)
			rec->zero_sizes[bytes]++;
		else
			snd_printk(KERN_DEBUG
				   "STAT: %d zero Bytes copied to hardware at "
				   "once - too big to save!\n",
				   bytes);
#endif
		snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 0,
						       bytes);
		return;
	}
	while (rec->hw_ready && (rec->sw_ready > 0)) {
		/* sw_to_end: max. number of bytes that can be read/take from
		 * the current position (sw_data) in _one_ step
		 */
		unsigned int sw_to_end = rec->sw_buffer_size - rec->sw_data;

		/* bytes: number of bytes we have available (for reading) */
		unsigned int bytes = rec->sw_ready;

		if (sw_to_end < bytes)
			bytes = sw_to_end;
		if (!bytes)
			break;

#ifdef SND_PCM_INDIRECT2_STAT
		if (rec->firstbytetime == 0)
			rec->firstbytetime = jiffies;
		rec->lastbytetime = jiffies;
#endif
		/* copy bytes from intermediate buffer position sw_data to the
		 * HW and return number of bytes actually written
		 * Furthermore, set hw_ready to 0, if the fifo isn't empty
		 * now => more could be transfered to fifo
		 */
		bytes = copy(substream, rec, bytes);
		rec->bytes2hw += bytes;

#ifdef SND_PCM_INDIRECT2_STAT
		if (bytes < 64)
			rec->byte_sizes[bytes]++;
		else
			snd_printk(KERN_DEBUG
				   "STAT: %d Bytes copied to hardware at once "
				   "- too big to save!\n",
				   bytes);
#endif
		/* increase sw_data by the number of actually written bytes
		 * (= number of taken bytes from intermediate buffer)
		 */
		rec->sw_data += bytes;
		if (rec->sw_data == rec->sw_buffer_size)
			rec->sw_data = 0;
		/* now sw_data is the position where ALSA is going to write
		 * in the intermediate buffer next time = position we are going
		 * to read from next time
		 */

		snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 1,
						       bytes);

		/* we read bytes from intermediate buffer, so we need to say
		 * that the number of bytes ready for transfer are decreased
		 * now
		 */
		rec->sw_ready -= bytes;
	}
	return;
}

/*
 * helper function for playback interrupt routine
 */
void
snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
				     struct snd_pcm_indirect2 *rec,
				     snd_pcm_indirect2_copy_t copy,
				     snd_pcm_indirect2_zero_t zero)
{
#ifdef SND_PCM_INDIRECT2_STAT
	rec->irq_occured++;
#endif
	/* hardware played some bytes, so there is room again (in fifo) */
	rec->hw_ready = 1;

	/* don't call ack() now, instead call transfer() function directly
	 * (normally called by ack() )
	 */
	snd_pcm_indirect2_playback_transfer(substream, rec, copy, zero);

	if (rec->min_periods >= rec->min_multiple) {
#ifdef SND_PCM_INDIRECT2_STAT
		if ((rec->min_periods / rec->min_multiple) > 7)
			snd_printk(KERN_DEBUG
				   "STAT: more than 7 (%d) mul_adds - too big "
				   "to save!\n",
				   (rec->min_periods / rec->min_multiple));
		else
			rec->mul_adds[(rec->min_periods /
				       rec->min_multiple)]++;
		rec->mul_elapsed_real += (rec->min_periods /
					  rec->min_multiple);
		rec->mul_elapsed++;
#endif
		rec->min_periods = (rec->min_periods % rec->min_multiple);
		snd_pcm_period_elapsed(substream);
	}
}

/*
 * _internal_ helper function for capture interrupt callback
 */
static void
snd_pcm_indirect2_capture_transfer(struct snd_pcm_substream *substream,
				   struct snd_pcm_indirect2 *rec,
				   snd_pcm_indirect2_copy_t copy,
				   snd_pcm_indirect2_zero_t null)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
	snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;

	if (diff) {
#ifdef SND_PCM_INDIRECT2_STAT
		rec->lastdifftime = jiffies;
#endif
		if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
			diff += runtime->boundary;
		rec->sw_ready -= frames_to_bytes(runtime, diff);
		rec->appl_ptr = appl_ptr;
	}
	/* if hardware has something, but the intermediate buffer is full
	 * => skip contents of buffer
	 */
	if (rec->hw_ready && (rec->sw_ready >= (int)rec->sw_buffer_size)) {
		unsigned int bytes;

#ifdef SND_PCM_INDIRECT2_STAT
		if (rec->firstzerotime == 0) {
			rec->firstzerotime = jiffies;
			snd_printk(KERN_DEBUG "STAT: (capture) "
				   "@firstzerotime: mul_elapsed: %d, "
				   "min_period_count: %d\n",
				   rec->mul_elapsed, rec->min_period_count);
			snd_printk(KERN_DEBUG "STAT: (capture) "
				   "@firstzerotime: sw_io: %d, sw_data: %d, "
				   "appl_ptr: %u\n",
				   rec->sw_io, rec->sw_data,
				   (unsigned int)appl_ptr);
		}
		if ((jiffies - rec->firstzerotime) < 3750) {
			rec->zero_times[(jiffies - rec->firstzerotime)]++;
			rec->zero_times_saved++;
		} else
			rec->zero_times_notsaved++;
#endif
		bytes = null(substream, rec);

#ifdef SND_PCM_INDIRECT2_STAT
		rec->zeros2hw += bytes;
		if (bytes < 64)
			rec->zero_sizes[bytes]++;
		else
			snd_printk(KERN_DEBUG
				   "STAT: (capture) %d zero Bytes copied to "
				   "hardware at once - too big to save!\n",
				   bytes);
#endif
		snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 0,
						       bytes);
		/* report an overrun */
		rec->sw_io = SNDRV_PCM_POS_XRUN;
		return;
	}
	while (rec->hw_ready && (rec->sw_ready < (int)rec->sw_buffer_size)) {
		/* sw_to_end: max. number of bytes that we can write to the
		 *  intermediate buffer (until it's end)
		 */
		size_t sw_to_end = rec->sw_buffer_size - rec->sw_data;

		/* bytes: max. number of bytes, which may be copied to the
		 *  intermediate buffer without overflow (in _one_ step)
		 */
		size_t bytes = rec->sw_buffer_size - rec->sw_ready;

		/* limit number of bytes (for transfer) by available room in
		 * the intermediate buffer
		 */
		if (sw_to_end < bytes)
			bytes = sw_to_end;
		if (!bytes)
			break;

#ifdef SND_PCM_INDIRECT2_STAT
		if (rec->firstbytetime == 0)
			rec->firstbytetime = jiffies;
		rec->lastbytetime = jiffies;
#endif
		/* copy bytes from the intermediate buffer (position sw_data)
		 * to the HW at most and return number of bytes actually copied
		 * from HW
		 * Furthermore, set hw_ready to 0, if the fifo is empty now.
		 */
		bytes = copy(substream, rec, bytes);
		rec->bytes2hw += bytes;

#ifdef SND_PCM_INDIRECT2_STAT
		if (bytes < 64)
			rec->byte_sizes[bytes]++;
		else
			snd_printk(KERN_DEBUG
				   "STAT: (capture) %d Bytes copied to "
				   "hardware at once - too big to save!\n",
				   bytes);
#endif
		/* increase sw_data by the number of actually copied bytes from
		 * HW
		 */
		rec->sw_data += bytes;
		if (rec->sw_data == rec->sw_buffer_size)
			rec->sw_data = 0;

		snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 1,
						       bytes);

		/* number of bytes in the intermediate buffer, which haven't
		 * been fetched by ALSA yet.
		 */
		rec->sw_ready += bytes;
	}
	return;
}

/*
 * helper function for capture interrupt routine
 */
void
snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
				    struct snd_pcm_indirect2 *rec,
				    snd_pcm_indirect2_copy_t copy,
				    snd_pcm_indirect2_zero_t null)
{
#ifdef SND_PCM_INDIRECT2_STAT
	rec->irq_occured++;
#endif
	/* hardware recorded some bytes, so there is something to read from the
	 * record fifo:
	 */
	rec->hw_ready = 1;

	/* don't call ack() now, instead call transfer() function directly
	 * (normally called by ack() )
	 */
	snd_pcm_indirect2_capture_transfer(substream, rec, copy, null);

	if (rec->min_periods >= rec->min_multiple) {

#ifdef SND_PCM_INDIRECT2_STAT
		if ((rec->min_periods / rec->min_multiple) > 7)
			snd_printk(KERN_DEBUG
				   "STAT: more than 7 (%d) mul_adds - "
				   "too big to save!\n",
				   (rec->min_periods / rec->min_multiple));
		else
			rec->mul_adds[(rec->min_periods /
				       rec->min_multiple)]++;
		rec->mul_elapsed_real += (rec->min_periods /
					  rec->min_multiple);
		rec->mul_elapsed++;
#endif
		rec->min_periods = (rec->min_periods % rec->min_multiple);
		snd_pcm_period_elapsed(substream);
	}
}