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TOMOYO Linux Cross Reference
Linux/sound/drivers/pcm-indirect2.c

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  1 /*
  2  * Helper functions for indirect PCM data transfer to a simple FIFO in
  3  * hardware (small, no possibility to read "hardware io position",
  4  * updating position done by interrupt, ...)
  5  *
  6  *  Copyright (c) by 2007  Joachim Foerster <JOFT@gmx.de>
  7  *
  8  *  Based on "pcm-indirect.h" (alsa-driver-1.0.13) by
  9  *
 10  *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
 11  *                   Jaroslav Kysela <perex@suse.cz>
 12  *
 13  *   This program is free software; you can redistribute it and/or modify
 14  *   it under the terms of the GNU General Public License as published by
 15  *   the Free Software Foundation; either version 2 of the License, or
 16  *   (at your option) any later version.
 17  *
 18  *   This program is distributed in the hope that it will be useful,
 19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *   GNU General Public License for more details.
 22  *
 23  *   You should have received a copy of the GNU General Public License
 24  *   along with this program; if not, write to the Free Software
 25  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 26  */
 27 
 28 /* snd_printk/d() */
 29 #include <sound/core.h>
 30 /* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t
 31  * snd_pcm_period_elapsed() */
 32 #include <sound/pcm.h>
 33 
 34 #include "pcm-indirect2.h"
 35 
 36 #ifdef SND_PCM_INDIRECT2_STAT
 37 /* jiffies */
 38 #include <linux/jiffies.h>
 39 
 40 void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
 41                             struct snd_pcm_indirect2 *rec)
 42 {
 43         struct snd_pcm_runtime *runtime = substream->runtime;
 44         int i;
 45         int j;
 46         int k;
 47         int seconds = (rec->lastbytetime - rec->firstbytetime) / HZ;
 48 
 49         snd_printk(KERN_DEBUG "STAT: mul_elapsed: %u, mul_elapsed_real: %d, "
 50                    "irq_occured: %d\n",
 51                    rec->mul_elapsed, rec->mul_elapsed_real, rec->irq_occured);
 52         snd_printk(KERN_DEBUG "STAT: min_multiple: %d (irqs/period)\n",
 53                    rec->min_multiple);
 54         snd_printk(KERN_DEBUG "STAT: firstbytetime: %lu, lastbytetime: %lu, "
 55                    "firstzerotime: %lu\n",
 56                  rec->firstbytetime, rec->lastbytetime, rec->firstzerotime);
 57         snd_printk(KERN_DEBUG "STAT: bytes2hw: %u Bytes => (by runtime->rate) "
 58                    "length: %d s\n",
 59                  rec->bytes2hw, rec->bytes2hw / 2 / 2 / runtime->rate);
 60         snd_printk(KERN_DEBUG "STAT: (by measurement) length: %d => "
 61                    "rate: %d Bytes/s = %d Frames/s|Hz\n",
 62                    seconds, rec->bytes2hw / seconds,
 63                    rec->bytes2hw / 2 / 2 / seconds);
 64         snd_printk(KERN_DEBUG
 65                    "STAT: zeros2hw: %u = %d ms ~ %d * %d zero copies\n",
 66                    rec->zeros2hw, ((rec->zeros2hw / 2 / 2) * 1000) /
 67                    runtime->rate,
 68                    rec->zeros2hw / (rec->hw_buffer_size / 2),
 69                    (rec->hw_buffer_size / 2));
 70         snd_printk(KERN_DEBUG "STAT: pointer_calls: %u, lastdifftime: %u\n",
 71                    rec->pointer_calls, rec->lastdifftime);
 72         snd_printk(KERN_DEBUG "STAT: sw_io: %d, sw_data: %d\n", rec->sw_io,
 73                    rec->sw_data);
 74         snd_printk(KERN_DEBUG "STAT: byte_sizes[]:\n");
 75         k = 0;
 76         for (j = 0; j < 8; j++) {
 77                 for (i = j * 8; i < (j + 1) * 8; i++)
 78                         if (rec->byte_sizes[i] != 0) {
 79                                 snd_printk(KERN_DEBUG "%u: %u",
 80                                            i, rec->byte_sizes[i]);
 81                                 k++;
 82                         }
 83                 if (((k % 8) == 0) && (k != 0)) {
 84                         snd_printk(KERN_DEBUG "\n");
 85                         k = 0;
 86                 }
 87         }
 88         snd_printk(KERN_DEBUG "\n");
 89         snd_printk(KERN_DEBUG "STAT: zero_sizes[]:\n");
 90         for (j = 0; j < 8; j++) {
 91                 k = 0;
 92                 for (i = j * 8; i < (j + 1) * 8; i++)
 93                         if (rec->zero_sizes[i] != 0)
 94                                 snd_printk(KERN_DEBUG "%u: %u",
 95                                            i, rec->zero_sizes[i]);
 96                         else
 97                                 k++;
 98                 if (!k)
 99                         snd_printk(KERN_DEBUG "\n");
100         }
101         snd_printk(KERN_DEBUG "\n");
102         snd_printk(KERN_DEBUG "STAT: min_adds[]:\n");
103         for (j = 0; j < 8; j++) {
104                 if (rec->min_adds[j] != 0)
105                         snd_printk(KERN_DEBUG "%u: %u", j, rec->min_adds[j]);
106         }
107         snd_printk(KERN_DEBUG "\n");
108         snd_printk(KERN_DEBUG "STAT: mul_adds[]:\n");
109         for (j = 0; j < 8; j++) {
110                 if (rec->mul_adds[j] != 0)
111                         snd_printk(KERN_DEBUG "%u: %u", j, rec->mul_adds[j]);
112         }
113         snd_printk(KERN_DEBUG "\n");
114         snd_printk(KERN_DEBUG
115                    "STAT: zero_times_saved: %d, zero_times_notsaved: %d\n",
116                    rec->zero_times_saved, rec->zero_times_notsaved);
117         /* snd_printk(KERN_DEBUG "STAT: zero_times[]\n");
118         i = 0;
119         for (j = 0; j < 3750; j++) {
120                 if (rec->zero_times[j] != 0) {
121                         snd_printk(KERN_DEBUG "%u: %u", j, rec->zero_times[j]);
122                         i++;
123                 }
124                 if (((i % 8) == 0) && (i != 0))
125                         snd_printk(KERN_DEBUG "\n");
126         }
127         snd_printk(KERN_DEBUG "\n"); */
128         return;
129 }
130 #endif
131 
132 /*
133  * _internal_ helper function for playback/capture transfer function
134  */
135 static void
136 snd_pcm_indirect2_increase_min_periods(struct snd_pcm_substream *substream,
137                                        struct snd_pcm_indirect2 *rec,
138                                        int isplay, int iscopy,
139                                        unsigned int bytes)
140 {
141         if (rec->min_periods >= 0) {
142                 if (iscopy) {
143                         rec->sw_io += bytes;
144                         if (rec->sw_io >= rec->sw_buffer_size)
145                                 rec->sw_io -= rec->sw_buffer_size;
146                 } else if (isplay) {
147                         /* If application does not write data in multiples of
148                          * a period, move sw_data to the next correctly aligned
149                          * position, so that sw_io can converge to it (in the
150                          * next step).
151                          */
152                         if (!rec->check_alignment) {
153                                 if (rec->bytes2hw %
154                                     snd_pcm_lib_period_bytes(substream)) {
155                                         unsigned bytes2hw_aligned =
156                                             (1 +
157                                              (rec->bytes2hw /
158                                               snd_pcm_lib_period_bytes
159                                               (substream))) *
160                                             snd_pcm_lib_period_bytes
161                                             (substream);
162                                         rec->sw_data =
163                                             bytes2hw_aligned %
164                                             rec->sw_buffer_size;
165 #ifdef SND_PCM_INDIRECT2_STAT
166                                         snd_printk(KERN_DEBUG
167                                                    "STAT: @re-align: aligned "
168                                                    "bytes2hw to next period "
169                                                    "size boundary: %d "
170                                                    "(instead of %d)\n",
171                                                    bytes2hw_aligned,
172                                                    rec->bytes2hw);
173                                         snd_printk(KERN_DEBUG
174                                                    "STAT: @re-align: sw_data "
175                                                    "moves to: %d\n",
176                                                    rec->sw_data);
177 #endif
178                                 }
179                                 rec->check_alignment = 1;
180                         }
181                         /* We are at the end and are copying zeros into the
182                          * fifo.
183                          * Now, we have to make sure that sw_io is increased
184                          * until the position of sw_data: Filling the fifo with
185                          * the first zeros means, the last bytes were played.
186                          */
187                         if (rec->sw_io != rec->sw_data) {
188                                 unsigned int diff;
189                                 if (rec->sw_data > rec->sw_io)
190                                         diff = rec->sw_data - rec->sw_io;
191                                 else
192                                         diff = (rec->sw_buffer_size -
193                                                 rec->sw_io) +
194                                                 rec->sw_data;
195                                 if (bytes >= diff)
196                                         rec->sw_io = rec->sw_data;
197                                 else {
198                                         rec->sw_io += bytes;
199                                         if (rec->sw_io >= rec->sw_buffer_size)
200                                                 rec->sw_io -=
201                                                     rec->sw_buffer_size;
202                                 }
203                         }
204                 }
205                 rec->min_period_count += bytes;
206                 if (rec->min_period_count >= (rec->hw_buffer_size / 2)) {
207                         rec->min_periods += (rec->min_period_count /
208                                              (rec->hw_buffer_size / 2));
209 #ifdef SND_PCM_INDIRECT2_STAT
210                         if ((rec->min_period_count /
211                              (rec->hw_buffer_size / 2)) > 7)
212                                 snd_printk(KERN_DEBUG
213                                            "STAT: more than 7 (%d) min_adds "
214                                            "at once - too big to save!\n",
215                                            (rec->min_period_count /
216                                             (rec->hw_buffer_size / 2)));
217                         else
218                                 rec->min_adds[(rec->min_period_count /
219                                                (rec->hw_buffer_size / 2))]++;
220 #endif
221                         rec->min_period_count = (rec->min_period_count %
222                                                  (rec->hw_buffer_size / 2));
223                 }
224         } else if (isplay && iscopy)
225                 rec->min_periods = 0;
226 }
227 
228 /*
229  * helper function for playback/capture pointer callback
230  */
231 snd_pcm_uframes_t
232 snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
233                           struct snd_pcm_indirect2 *rec)
234 {
235 #ifdef SND_PCM_INDIRECT2_STAT
236         rec->pointer_calls++;
237 #endif
238         return bytes_to_frames(substream->runtime, rec->sw_io);
239 }
240 
241 /*
242  * _internal_ helper function for playback interrupt callback
243  */
244 static void
245 snd_pcm_indirect2_playback_transfer(struct snd_pcm_substream *substream,
246                                     struct snd_pcm_indirect2 *rec,
247                                     snd_pcm_indirect2_copy_t copy,
248                                     snd_pcm_indirect2_zero_t zero)
249 {
250         struct snd_pcm_runtime *runtime = substream->runtime;
251         snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
252 
253         /* runtime->control->appl_ptr: position where ALSA will write next time
254          * rec->appl_ptr: position where ALSA was last time
255          * diff: obviously ALSA wrote that much bytes into the intermediate
256          * buffer since we checked last time
257          */
258         snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;
259 
260         if (diff) {
261 #ifdef SND_PCM_INDIRECT2_STAT
262                 rec->lastdifftime = jiffies;
263 #endif
264                 if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
265                         diff += runtime->boundary;
266                 /* number of bytes "added" by ALSA increases the number of
267                  * bytes which are ready to "be transferred to HW"/"played"
268                  * Then, set rec->appl_ptr to not count bytes twice next time.
269                  */
270                 rec->sw_ready += (int)frames_to_bytes(runtime, diff);
271                 rec->appl_ptr = appl_ptr;
272         }
273         if (rec->hw_ready && (rec->sw_ready <= 0)) {
274                 unsigned int bytes;
275 
276 #ifdef SND_PCM_INDIRECT2_STAT
277                 if (rec->firstzerotime == 0) {
278                         rec->firstzerotime = jiffies;
279                         snd_printk(KERN_DEBUG
280                                    "STAT: @firstzerotime: mul_elapsed: %d, "
281                                    "min_period_count: %d\n",
282                                    rec->mul_elapsed, rec->min_period_count);
283                         snd_printk(KERN_DEBUG
284                                    "STAT: @firstzerotime: sw_io: %d, "
285                                    "sw_data: %d, appl_ptr: %u\n",
286                                    rec->sw_io, rec->sw_data,
287                                    (unsigned int)appl_ptr);
288                 }
289                 if ((jiffies - rec->firstzerotime) < 3750) {
290                         rec->zero_times[(jiffies - rec->firstzerotime)]++;
291                         rec->zero_times_saved++;
292                 } else
293                         rec->zero_times_notsaved++;
294 #endif
295                 bytes = zero(substream, rec);
296 
297 #ifdef SND_PCM_INDIRECT2_STAT
298                 rec->zeros2hw += bytes;
299                 if (bytes < 64)
300                         rec->zero_sizes[bytes]++;
301                 else
302                         snd_printk(KERN_DEBUG
303                                    "STAT: %d zero Bytes copied to hardware at "
304                                    "once - too big to save!\n",
305                                    bytes);
306 #endif
307                 snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 0,
308                                                        bytes);
309                 return;
310         }
311         while (rec->hw_ready && (rec->sw_ready > 0)) {
312                 /* sw_to_end: max. number of bytes that can be read/take from
313                  * the current position (sw_data) in _one_ step
314                  */
315                 unsigned int sw_to_end = rec->sw_buffer_size - rec->sw_data;
316 
317                 /* bytes: number of bytes we have available (for reading) */
318                 unsigned int bytes = rec->sw_ready;
319 
320                 if (sw_to_end < bytes)
321                         bytes = sw_to_end;
322                 if (!bytes)
323                         break;
324 
325 #ifdef SND_PCM_INDIRECT2_STAT
326                 if (rec->firstbytetime == 0)
327                         rec->firstbytetime = jiffies;
328                 rec->lastbytetime = jiffies;
329 #endif
330                 /* copy bytes from intermediate buffer position sw_data to the
331                  * HW and return number of bytes actually written
332                  * Furthermore, set hw_ready to 0, if the fifo isn't empty
333                  * now => more could be transferred to fifo
334                  */
335                 bytes = copy(substream, rec, bytes);
336                 rec->bytes2hw += bytes;
337 
338 #ifdef SND_PCM_INDIRECT2_STAT
339                 if (bytes < 64)
340                         rec->byte_sizes[bytes]++;
341                 else
342                         snd_printk(KERN_DEBUG
343                                    "STAT: %d Bytes copied to hardware at once "
344                                    "- too big to save!\n",
345                                    bytes);
346 #endif
347                 /* increase sw_data by the number of actually written bytes
348                  * (= number of taken bytes from intermediate buffer)
349                  */
350                 rec->sw_data += bytes;
351                 if (rec->sw_data == rec->sw_buffer_size)
352                         rec->sw_data = 0;
353                 /* now sw_data is the position where ALSA is going to write
354                  * in the intermediate buffer next time = position we are going
355                  * to read from next time
356                  */
357 
358                 snd_pcm_indirect2_increase_min_periods(substream, rec, 1, 1,
359                                                        bytes);
360 
361                 /* we read bytes from intermediate buffer, so we need to say
362                  * that the number of bytes ready for transfer are decreased
363                  * now
364                  */
365                 rec->sw_ready -= bytes;
366         }
367         return;
368 }
369 
370 /*
371  * helper function for playback interrupt routine
372  */
373 void
374 snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
375                                      struct snd_pcm_indirect2 *rec,
376                                      snd_pcm_indirect2_copy_t copy,
377                                      snd_pcm_indirect2_zero_t zero)
378 {
379 #ifdef SND_PCM_INDIRECT2_STAT
380         rec->irq_occured++;
381 #endif
382         /* hardware played some bytes, so there is room again (in fifo) */
383         rec->hw_ready = 1;
384 
385         /* don't call ack() now, instead call transfer() function directly
386          * (normally called by ack() )
387          */
388         snd_pcm_indirect2_playback_transfer(substream, rec, copy, zero);
389 
390         if (rec->min_periods >= rec->min_multiple) {
391 #ifdef SND_PCM_INDIRECT2_STAT
392                 if ((rec->min_periods / rec->min_multiple) > 7)
393                         snd_printk(KERN_DEBUG
394                                    "STAT: more than 7 (%d) mul_adds - too big "
395                                    "to save!\n",
396                                    (rec->min_periods / rec->min_multiple));
397                 else
398                         rec->mul_adds[(rec->min_periods /
399                                        rec->min_multiple)]++;
400                 rec->mul_elapsed_real += (rec->min_periods /
401                                           rec->min_multiple);
402                 rec->mul_elapsed++;
403 #endif
404                 rec->min_periods = (rec->min_periods % rec->min_multiple);
405                 snd_pcm_period_elapsed(substream);
406         }
407 }
408 
409 /*
410  * _internal_ helper function for capture interrupt callback
411  */
412 static void
413 snd_pcm_indirect2_capture_transfer(struct snd_pcm_substream *substream,
414                                    struct snd_pcm_indirect2 *rec,
415                                    snd_pcm_indirect2_copy_t copy,
416                                    snd_pcm_indirect2_zero_t null)
417 {
418         struct snd_pcm_runtime *runtime = substream->runtime;
419         snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
420         snd_pcm_sframes_t diff = appl_ptr - rec->appl_ptr;
421 
422         if (diff) {
423 #ifdef SND_PCM_INDIRECT2_STAT
424                 rec->lastdifftime = jiffies;
425 #endif
426                 if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
427                         diff += runtime->boundary;
428                 rec->sw_ready -= frames_to_bytes(runtime, diff);
429                 rec->appl_ptr = appl_ptr;
430         }
431         /* if hardware has something, but the intermediate buffer is full
432          * => skip contents of buffer
433          */
434         if (rec->hw_ready && (rec->sw_ready >= (int)rec->sw_buffer_size)) {
435                 unsigned int bytes;
436 
437 #ifdef SND_PCM_INDIRECT2_STAT
438                 if (rec->firstzerotime == 0) {
439                         rec->firstzerotime = jiffies;
440                         snd_printk(KERN_DEBUG "STAT: (capture) "
441                                    "@firstzerotime: mul_elapsed: %d, "
442                                    "min_period_count: %d\n",
443                                    rec->mul_elapsed, rec->min_period_count);
444                         snd_printk(KERN_DEBUG "STAT: (capture) "
445                                    "@firstzerotime: sw_io: %d, sw_data: %d, "
446                                    "appl_ptr: %u\n",
447                                    rec->sw_io, rec->sw_data,
448                                    (unsigned int)appl_ptr);
449                 }
450                 if ((jiffies - rec->firstzerotime) < 3750) {
451                         rec->zero_times[(jiffies - rec->firstzerotime)]++;
452                         rec->zero_times_saved++;
453                 } else
454                         rec->zero_times_notsaved++;
455 #endif
456                 bytes = null(substream, rec);
457 
458 #ifdef SND_PCM_INDIRECT2_STAT
459                 rec->zeros2hw += bytes;
460                 if (bytes < 64)
461                         rec->zero_sizes[bytes]++;
462                 else
463                         snd_printk(KERN_DEBUG
464                                    "STAT: (capture) %d zero Bytes copied to "
465                                    "hardware at once - too big to save!\n",
466                                    bytes);
467 #endif
468                 snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 0,
469                                                        bytes);
470                 /* report an overrun */
471                 rec->sw_io = SNDRV_PCM_POS_XRUN;
472                 return;
473         }
474         while (rec->hw_ready && (rec->sw_ready < (int)rec->sw_buffer_size)) {
475                 /* sw_to_end: max. number of bytes that we can write to the
476                  *  intermediate buffer (until it's end)
477                  */
478                 size_t sw_to_end = rec->sw_buffer_size - rec->sw_data;
479 
480                 /* bytes: max. number of bytes, which may be copied to the
481                  *  intermediate buffer without overflow (in _one_ step)
482                  */
483                 size_t bytes = rec->sw_buffer_size - rec->sw_ready;
484 
485                 /* limit number of bytes (for transfer) by available room in
486                  * the intermediate buffer
487                  */
488                 if (sw_to_end < bytes)
489                         bytes = sw_to_end;
490                 if (!bytes)
491                         break;
492 
493 #ifdef SND_PCM_INDIRECT2_STAT
494                 if (rec->firstbytetime == 0)
495                         rec->firstbytetime = jiffies;
496                 rec->lastbytetime = jiffies;
497 #endif
498                 /* copy bytes from the intermediate buffer (position sw_data)
499                  * to the HW at most and return number of bytes actually copied
500                  * from HW
501                  * Furthermore, set hw_ready to 0, if the fifo is empty now.
502                  */
503                 bytes = copy(substream, rec, bytes);
504                 rec->bytes2hw += bytes;
505 
506 #ifdef SND_PCM_INDIRECT2_STAT
507                 if (bytes < 64)
508                         rec->byte_sizes[bytes]++;
509                 else
510                         snd_printk(KERN_DEBUG
511                                    "STAT: (capture) %d Bytes copied to "
512                                    "hardware at once - too big to save!\n",
513                                    bytes);
514 #endif
515                 /* increase sw_data by the number of actually copied bytes from
516                  * HW
517                  */
518                 rec->sw_data += bytes;
519                 if (rec->sw_data == rec->sw_buffer_size)
520                         rec->sw_data = 0;
521 
522                 snd_pcm_indirect2_increase_min_periods(substream, rec, 0, 1,
523                                                        bytes);
524 
525                 /* number of bytes in the intermediate buffer, which haven't
526                  * been fetched by ALSA yet.
527                  */
528                 rec->sw_ready += bytes;
529         }
530         return;
531 }
532 
533 /*
534  * helper function for capture interrupt routine
535  */
536 void
537 snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
538                                     struct snd_pcm_indirect2 *rec,
539                                     snd_pcm_indirect2_copy_t copy,
540                                     snd_pcm_indirect2_zero_t null)
541 {
542 #ifdef SND_PCM_INDIRECT2_STAT
543         rec->irq_occured++;
544 #endif
545         /* hardware recorded some bytes, so there is something to read from the
546          * record fifo:
547          */
548         rec->hw_ready = 1;
549 
550         /* don't call ack() now, instead call transfer() function directly
551          * (normally called by ack() )
552          */
553         snd_pcm_indirect2_capture_transfer(substream, rec, copy, null);
554 
555         if (rec->min_periods >= rec->min_multiple) {
556 
557 #ifdef SND_PCM_INDIRECT2_STAT
558                 if ((rec->min_periods / rec->min_multiple) > 7)
559                         snd_printk(KERN_DEBUG
560                                    "STAT: more than 7 (%d) mul_adds - "
561                                    "too big to save!\n",
562                                    (rec->min_periods / rec->min_multiple));
563                 else
564                         rec->mul_adds[(rec->min_periods /
565                                        rec->min_multiple)]++;
566                 rec->mul_elapsed_real += (rec->min_periods /
567                                           rec->min_multiple);
568                 rec->mul_elapsed++;
569 #endif
570                 rec->min_periods = (rec->min_periods % rec->min_multiple);
571                 snd_pcm_period_elapsed(substream);
572         }
573 }
574 

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