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Linux/sound/core/pcm_memory.c

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  1 /*
  2  *  Digital Audio (PCM) abstract layer
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  *
 20  */
 21 
 22 #include <linux/io.h>
 23 #include <linux/time.h>
 24 #include <linux/init.h>
 25 #include <linux/slab.h>
 26 #include <linux/moduleparam.h>
 27 #include <linux/vmalloc.h>
 28 #include <linux/export.h>
 29 #include <sound/core.h>
 30 #include <sound/pcm.h>
 31 #include <sound/info.h>
 32 #include <sound/initval.h>
 33 
 34 static int preallocate_dma = 1;
 35 module_param(preallocate_dma, int, 0444);
 36 MODULE_PARM_DESC(preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized.");
 37 
 38 static int maximum_substreams = 4;
 39 module_param(maximum_substreams, int, 0444);
 40 MODULE_PARM_DESC(maximum_substreams, "Maximum substreams with preallocated DMA memory.");
 41 
 42 static const size_t snd_minimum_buffer = 16384;
 43 
 44 
 45 /*
 46  * try to allocate as the large pages as possible.
 47  * stores the resultant memory size in *res_size.
 48  *
 49  * the minimum size is snd_minimum_buffer.  it should be power of 2.
 50  */
 51 static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size)
 52 {
 53         struct snd_dma_buffer *dmab = &substream->dma_buffer;
 54         size_t orig_size = size;
 55         int err;
 56 
 57         do {
 58                 if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev,
 59                                                size, dmab)) < 0) {
 60                         if (err != -ENOMEM)
 61                                 return err; /* fatal error */
 62                 } else
 63                         return 0;
 64                 size >>= 1;
 65         } while (size >= snd_minimum_buffer);
 66         dmab->bytes = 0; /* tell error */
 67         pr_warn("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n",
 68                 substream->pcm->card->number, substream->pcm->device,
 69                 substream->stream ? 'c' : 'p', substream->number,
 70                 substream->pcm->name, orig_size);
 71         return 0;
 72 }
 73 
 74 /*
 75  * release the preallocated buffer if not yet done.
 76  */
 77 static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream)
 78 {
 79         if (substream->dma_buffer.area == NULL)
 80                 return;
 81         snd_dma_free_pages(&substream->dma_buffer);
 82         substream->dma_buffer.area = NULL;
 83 }
 84 
 85 /**
 86  * snd_pcm_lib_preallocate_free - release the preallocated buffer of the specified substream.
 87  * @substream: the pcm substream instance
 88  *
 89  * Releases the pre-allocated buffer of the given substream.
 90  *
 91  * Return: Zero if successful, or a negative error code on failure.
 92  */
 93 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream)
 94 {
 95         snd_pcm_lib_preallocate_dma_free(substream);
 96 #ifdef CONFIG_SND_VERBOSE_PROCFS
 97         snd_info_free_entry(substream->proc_prealloc_max_entry);
 98         substream->proc_prealloc_max_entry = NULL;
 99         snd_info_free_entry(substream->proc_prealloc_entry);
100         substream->proc_prealloc_entry = NULL;
101 #endif
102         return 0;
103 }
104 
105 /**
106  * snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm
107  * @pcm: the pcm instance
108  *
109  * Releases all the pre-allocated buffers on the given pcm.
110  *
111  * Return: Zero if successful, or a negative error code on failure.
112  */
113 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)
114 {
115         struct snd_pcm_substream *substream;
116         int stream;
117 
118         for (stream = 0; stream < 2; stream++)
119                 for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
120                         snd_pcm_lib_preallocate_free(substream);
121         return 0;
122 }
123 EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
124 
125 #ifdef CONFIG_SND_VERBOSE_PROCFS
126 /*
127  * read callback for prealloc proc file
128  *
129  * prints the current allocated size in kB.
130  */
131 static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry,
132                                               struct snd_info_buffer *buffer)
133 {
134         struct snd_pcm_substream *substream = entry->private_data;
135         snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024);
136 }
137 
138 /*
139  * read callback for prealloc_max proc file
140  *
141  * prints the maximum allowed size in kB.
142  */
143 static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry,
144                                                   struct snd_info_buffer *buffer)
145 {
146         struct snd_pcm_substream *substream = entry->private_data;
147         snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024);
148 }
149 
150 /*
151  * write callback for prealloc proc file
152  *
153  * accepts the preallocation size in kB.
154  */
155 static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry,
156                                                struct snd_info_buffer *buffer)
157 {
158         struct snd_pcm_substream *substream = entry->private_data;
159         char line[64], str[64];
160         size_t size;
161         struct snd_dma_buffer new_dmab;
162 
163         if (substream->runtime) {
164                 buffer->error = -EBUSY;
165                 return;
166         }
167         if (!snd_info_get_line(buffer, line, sizeof(line))) {
168                 snd_info_get_str(str, line, sizeof(str));
169                 size = simple_strtoul(str, NULL, 10) * 1024;
170                 if ((size != 0 && size < 8192) || size > substream->dma_max) {
171                         buffer->error = -EINVAL;
172                         return;
173                 }
174                 if (substream->dma_buffer.bytes == size)
175                         return;
176                 memset(&new_dmab, 0, sizeof(new_dmab));
177                 new_dmab.dev = substream->dma_buffer.dev;
178                 if (size > 0) {
179                         if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
180                                                 substream->dma_buffer.dev.dev,
181                                                 size, &new_dmab) < 0) {
182                                 buffer->error = -ENOMEM;
183                                 return;
184                         }
185                         substream->buffer_bytes_max = size;
186                 } else {
187                         substream->buffer_bytes_max = UINT_MAX;
188                 }
189                 if (substream->dma_buffer.area)
190                         snd_dma_free_pages(&substream->dma_buffer);
191                 substream->dma_buffer = new_dmab;
192         } else {
193                 buffer->error = -EINVAL;
194         }
195 }
196 
197 static inline void preallocate_info_init(struct snd_pcm_substream *substream)
198 {
199         struct snd_info_entry *entry;
200 
201         if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) {
202                 entry->c.text.read = snd_pcm_lib_preallocate_proc_read;
203                 entry->c.text.write = snd_pcm_lib_preallocate_proc_write;
204                 entry->mode |= S_IWUSR;
205                 entry->private_data = substream;
206                 if (snd_info_register(entry) < 0) {
207                         snd_info_free_entry(entry);
208                         entry = NULL;
209                 }
210         }
211         substream->proc_prealloc_entry = entry;
212         if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) {
213                 entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read;
214                 entry->private_data = substream;
215                 if (snd_info_register(entry) < 0) {
216                         snd_info_free_entry(entry);
217                         entry = NULL;
218                 }
219         }
220         substream->proc_prealloc_max_entry = entry;
221 }
222 
223 #else /* !CONFIG_SND_VERBOSE_PROCFS */
224 #define preallocate_info_init(s)
225 #endif /* CONFIG_SND_VERBOSE_PROCFS */
226 
227 /*
228  * pre-allocate the buffer and create a proc file for the substream
229  */
230 static int snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream,
231                                           size_t size, size_t max)
232 {
233 
234         if (size > 0 && preallocate_dma && substream->number < maximum_substreams)
235                 preallocate_pcm_pages(substream, size);
236 
237         if (substream->dma_buffer.bytes > 0)
238                 substream->buffer_bytes_max = substream->dma_buffer.bytes;
239         substream->dma_max = max;
240         preallocate_info_init(substream);
241         return 0;
242 }
243 
244 
245 /**
246  * snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type
247  * @substream: the pcm substream instance
248  * @type: DMA type (SNDRV_DMA_TYPE_*)
249  * @data: DMA type dependent data
250  * @size: the requested pre-allocation size in bytes
251  * @max: the max. allowed pre-allocation size
252  *
253  * Do pre-allocation for the given DMA buffer type.
254  *
255  * Return: Zero if successful, or a negative error code on failure.
256  */
257 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
258                                   int type, struct device *data,
259                                   size_t size, size_t max)
260 {
261         substream->dma_buffer.dev.type = type;
262         substream->dma_buffer.dev.dev = data;
263         return snd_pcm_lib_preallocate_pages1(substream, size, max);
264 }
265 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
266 
267 /**
268  * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continuous memory type (all substreams)
269  * @pcm: the pcm instance
270  * @type: DMA type (SNDRV_DMA_TYPE_*)
271  * @data: DMA type dependent data
272  * @size: the requested pre-allocation size in bytes
273  * @max: the max. allowed pre-allocation size
274  *
275  * Do pre-allocation to all substreams of the given pcm for the
276  * specified DMA type.
277  *
278  * Return: Zero if successful, or a negative error code on failure.
279  */
280 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
281                                           int type, void *data,
282                                           size_t size, size_t max)
283 {
284         struct snd_pcm_substream *substream;
285         int stream, err;
286 
287         for (stream = 0; stream < 2; stream++)
288                 for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
289                         if ((err = snd_pcm_lib_preallocate_pages(substream, type, data, size, max)) < 0)
290                                 return err;
291         return 0;
292 }
293 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
294 
295 #ifdef CONFIG_SND_DMA_SGBUF
296 /**
297  * snd_pcm_sgbuf_ops_page - get the page struct at the given offset
298  * @substream: the pcm substream instance
299  * @offset: the buffer offset
300  *
301  * Used as the page callback of PCM ops.
302  *
303  * Return: The page struct at the given buffer offset. %NULL on failure.
304  */
305 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset)
306 {
307         struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
308 
309         unsigned int idx = offset >> PAGE_SHIFT;
310         if (idx >= (unsigned int)sgbuf->pages)
311                 return NULL;
312         return sgbuf->page_table[idx];
313 }
314 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
315 #endif /* CONFIG_SND_DMA_SGBUF */
316 
317 /**
318  * snd_pcm_lib_malloc_pages - allocate the DMA buffer
319  * @substream: the substream to allocate the DMA buffer to
320  * @size: the requested buffer size in bytes
321  *
322  * Allocates the DMA buffer on the BUS type given earlier to
323  * snd_pcm_lib_preallocate_xxx_pages().
324  *
325  * Return: 1 if the buffer is changed, 0 if not changed, or a negative
326  * code on failure.
327  */
328 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size)
329 {
330         struct snd_pcm_runtime *runtime;
331         struct snd_dma_buffer *dmab = NULL;
332 
333         if (PCM_RUNTIME_CHECK(substream))
334                 return -EINVAL;
335         if (snd_BUG_ON(substream->dma_buffer.dev.type ==
336                        SNDRV_DMA_TYPE_UNKNOWN))
337                 return -EINVAL;
338         runtime = substream->runtime;
339 
340         if (runtime->dma_buffer_p) {
341                 /* perphaps, we might free the large DMA memory region
342                    to save some space here, but the actual solution
343                    costs us less time */
344                 if (runtime->dma_buffer_p->bytes >= size) {
345                         runtime->dma_bytes = size;
346                         return 0;       /* ok, do not change */
347                 }
348                 snd_pcm_lib_free_pages(substream);
349         }
350         if (substream->dma_buffer.area != NULL &&
351             substream->dma_buffer.bytes >= size) {
352                 dmab = &substream->dma_buffer; /* use the pre-allocated buffer */
353         } else {
354                 dmab = kzalloc(sizeof(*dmab), GFP_KERNEL);
355                 if (! dmab)
356                         return -ENOMEM;
357                 dmab->dev = substream->dma_buffer.dev;
358                 if (snd_dma_alloc_pages(substream->dma_buffer.dev.type,
359                                         substream->dma_buffer.dev.dev,
360                                         size, dmab) < 0) {
361                         kfree(dmab);
362                         return -ENOMEM;
363                 }
364         }
365         snd_pcm_set_runtime_buffer(substream, dmab);
366         runtime->dma_bytes = size;
367         return 1;                       /* area was changed */
368 }
369 EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
370 
371 /**
372  * snd_pcm_lib_free_pages - release the allocated DMA buffer.
373  * @substream: the substream to release the DMA buffer
374  *
375  * Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages().
376  *
377  * Return: Zero if successful, or a negative error code on failure.
378  */
379 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream)
380 {
381         struct snd_pcm_runtime *runtime;
382 
383         if (PCM_RUNTIME_CHECK(substream))
384                 return -EINVAL;
385         runtime = substream->runtime;
386         if (runtime->dma_area == NULL)
387                 return 0;
388         if (runtime->dma_buffer_p != &substream->dma_buffer) {
389                 /* it's a newly allocated buffer.  release it now. */
390                 snd_dma_free_pages(runtime->dma_buffer_p);
391                 kfree(runtime->dma_buffer_p);
392         }
393         snd_pcm_set_runtime_buffer(substream, NULL);
394         return 0;
395 }
396 EXPORT_SYMBOL(snd_pcm_lib_free_pages);
397 
398 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
399                                       size_t size, gfp_t gfp_flags)
400 {
401         struct snd_pcm_runtime *runtime;
402 
403         if (PCM_RUNTIME_CHECK(substream))
404                 return -EINVAL;
405         runtime = substream->runtime;
406         if (runtime->dma_area) {
407                 if (runtime->dma_bytes >= size)
408                         return 0; /* already large enough */
409                 vfree(runtime->dma_area);
410         }
411         runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL);
412         if (!runtime->dma_area)
413                 return -ENOMEM;
414         runtime->dma_bytes = size;
415         return 1;
416 }
417 EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer);
418 
419 /**
420  * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer
421  * @substream: the substream with a buffer allocated by
422  *      snd_pcm_lib_alloc_vmalloc_buffer()
423  *
424  * Return: Zero if successful, or a negative error code on failure.
425  */
426 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream)
427 {
428         struct snd_pcm_runtime *runtime;
429 
430         if (PCM_RUNTIME_CHECK(substream))
431                 return -EINVAL;
432         runtime = substream->runtime;
433         vfree(runtime->dma_area);
434         runtime->dma_area = NULL;
435         return 0;
436 }
437 EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer);
438 
439 /**
440  * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct
441  * @substream: the substream with a buffer allocated by
442  *      snd_pcm_lib_alloc_vmalloc_buffer()
443  * @offset: offset in the buffer
444  *
445  * This function is to be used as the page callback in the PCM ops.
446  *
447  * Return: The page struct, or %NULL on failure.
448  */
449 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
450                                           unsigned long offset)
451 {
452         return vmalloc_to_page(substream->runtime->dma_area + offset);
453 }
454 EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page);
455 

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