blob: 02132561c3f845d326f2bbf34a8870efab3439d5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
3 * Takashi Iwai <tiwai@suse.de>
4 *
5 * Generic memory allocators
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#include <linux/config.h>
25#include <linux/module.h>
26#include <linux/proc_fs.h>
27#include <linux/init.h>
28#include <linux/pci.h>
29#include <linux/slab.h>
30#include <linux/mm.h>
Takashi Iwaib6a96912005-05-30 18:27:03 +020031#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/dma-mapping.h>
33#include <linux/moduleparam.h>
34#include <asm/semaphore.h>
35#include <sound/memalloc.h>
36#ifdef CONFIG_SBUS
37#include <asm/sbus.h>
38#endif
39
40
41MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@suse.cz>");
42MODULE_DESCRIPTION("Memory allocator for ALSA system.");
43MODULE_LICENSE("GPL");
44
45
46#ifndef SNDRV_CARDS
47#define SNDRV_CARDS 8
48#endif
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050/*
51 */
52
53void *snd_malloc_sgbuf_pages(struct device *device,
54 size_t size, struct snd_dma_buffer *dmab,
55 size_t *res_size);
56int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
57
58/*
59 */
60
61static DECLARE_MUTEX(list_mutex);
62static LIST_HEAD(mem_list_head);
63
64/* buffer preservation list */
65struct snd_mem_list {
66 struct snd_dma_buffer buffer;
67 unsigned int id;
68 struct list_head list;
69};
70
71/* id for pre-allocated buffers */
72#define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
73
74#ifdef CONFIG_SND_DEBUG
75#define __ASTRING__(x) #x
76#define snd_assert(expr, args...) do {\
77 if (!(expr)) {\
78 printk(KERN_ERR "snd-malloc: BUG? (%s) (called from %p)\n", __ASTRING__(expr), __builtin_return_address(0));\
79 args;\
80 }\
81} while (0)
82#else
83#define snd_assert(expr, args...) /**/
84#endif
85
86/*
87 * Hacks
88 */
89
90#if defined(__i386__) || defined(__ppc__) || defined(__x86_64__)
91/*
92 * A hack to allocate large buffers via dma_alloc_coherent()
93 *
94 * since dma_alloc_coherent always tries GFP_DMA when the requested
95 * pci memory region is below 32bit, it happens quite often that even
96 * 2 order of pages cannot be allocated.
97 *
98 * so in the following, we allocate at first without dma_mask, so that
99 * allocation will be done without GFP_DMA. if the area doesn't match
100 * with the requested region, then realloate with the original dma_mask
101 * again.
102 *
103 * Really, we want to move this type of thing into dma_alloc_coherent()
104 * so dma_mask doesn't have to be messed with.
105 */
106
107static void *snd_dma_hack_alloc_coherent(struct device *dev, size_t size,
Victor Fusco5a0f2172005-07-26 13:42:31 +0200108 dma_addr_t *dma_handle,
109 unsigned int __nocast flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 void *ret;
112 u64 dma_mask, coherent_dma_mask;
113
114 if (dev == NULL || !dev->dma_mask)
115 return dma_alloc_coherent(dev, size, dma_handle, flags);
116 dma_mask = *dev->dma_mask;
117 coherent_dma_mask = dev->coherent_dma_mask;
118 *dev->dma_mask = 0xffffffff; /* do without masking */
119 dev->coherent_dma_mask = 0xffffffff; /* do without masking */
120 ret = dma_alloc_coherent(dev, size, dma_handle, flags);
121 *dev->dma_mask = dma_mask; /* restore */
122 dev->coherent_dma_mask = coherent_dma_mask; /* restore */
123 if (ret) {
124 /* obtained address is out of range? */
125 if (((unsigned long)*dma_handle + size - 1) & ~dma_mask) {
126 /* reallocate with the proper mask */
127 dma_free_coherent(dev, size, ret, *dma_handle);
128 ret = dma_alloc_coherent(dev, size, dma_handle, flags);
129 }
130 } else {
131 /* wish to success now with the proper mask... */
132 if (dma_mask != 0xffffffffUL) {
133 /* allocation with GFP_ATOMIC to avoid the long stall */
134 flags &= ~GFP_KERNEL;
135 flags |= GFP_ATOMIC;
136 ret = dma_alloc_coherent(dev, size, dma_handle, flags);
137 }
138 }
139 return ret;
140}
141
142/* redefine dma_alloc_coherent for some architectures */
143#undef dma_alloc_coherent
144#define dma_alloc_coherent snd_dma_hack_alloc_coherent
145
146#endif /* arch */
147
148#if ! defined(__arm__)
149#define NEED_RESERVE_PAGES
150#endif
151
152/*
153 *
154 * Generic memory allocators
155 *
156 */
157
158static long snd_allocated_pages; /* holding the number of allocated pages */
159
160static inline void inc_snd_pages(int order)
161{
162 snd_allocated_pages += 1 << order;
163}
164
165static inline void dec_snd_pages(int order)
166{
167 snd_allocated_pages -= 1 << order;
168}
169
170static void mark_pages(struct page *page, int order)
171{
172 struct page *last_page = page + (1 << order);
173 while (page < last_page)
174 SetPageReserved(page++);
175}
176
177static void unmark_pages(struct page *page, int order)
178{
179 struct page *last_page = page + (1 << order);
180 while (page < last_page)
181 ClearPageReserved(page++);
182}
183
184/**
185 * snd_malloc_pages - allocate pages with the given size
186 * @size: the size to allocate in bytes
187 * @gfp_flags: the allocation conditions, GFP_XXX
188 *
189 * Allocates the physically contiguous pages with the given size.
190 *
191 * Returns the pointer of the buffer, or NULL if no enoguh memory.
192 */
193void *snd_malloc_pages(size_t size, unsigned int gfp_flags)
194{
195 int pg;
196 void *res;
197
198 snd_assert(size > 0, return NULL);
199 snd_assert(gfp_flags != 0, return NULL);
200 pg = get_order(size);
201 if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) {
202 mark_pages(virt_to_page(res), pg);
203 inc_snd_pages(pg);
204 }
205 return res;
206}
207
208/**
209 * snd_free_pages - release the pages
210 * @ptr: the buffer pointer to release
211 * @size: the allocated buffer size
212 *
213 * Releases the buffer allocated via snd_malloc_pages().
214 */
215void snd_free_pages(void *ptr, size_t size)
216{
217 int pg;
218
219 if (ptr == NULL)
220 return;
221 pg = get_order(size);
222 dec_snd_pages(pg);
223 unmark_pages(virt_to_page(ptr), pg);
224 free_pages((unsigned long) ptr, pg);
225}
226
227/*
228 *
229 * Bus-specific memory allocators
230 *
231 */
232
233/* allocate the coherent DMA pages */
234static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
235{
236 int pg;
237 void *res;
238 unsigned int gfp_flags;
239
240 snd_assert(size > 0, return NULL);
241 snd_assert(dma != NULL, return NULL);
242 pg = get_order(size);
243 gfp_flags = GFP_KERNEL
244 | __GFP_NORETRY /* don't trigger OOM-killer */
245 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
246 res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
247 if (res != NULL) {
248#ifdef NEED_RESERVE_PAGES
249 mark_pages(virt_to_page(res), pg); /* should be dma_to_page() */
250#endif
251 inc_snd_pages(pg);
252 }
253
254 return res;
255}
256
257/* free the coherent DMA pages */
258static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
259 dma_addr_t dma)
260{
261 int pg;
262
263 if (ptr == NULL)
264 return;
265 pg = get_order(size);
266 dec_snd_pages(pg);
267#ifdef NEED_RESERVE_PAGES
268 unmark_pages(virt_to_page(ptr), pg); /* should be dma_to_page() */
269#endif
270 dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
271}
272
273#ifdef CONFIG_SBUS
274
275static void *snd_malloc_sbus_pages(struct device *dev, size_t size,
276 dma_addr_t *dma_addr)
277{
278 struct sbus_dev *sdev = (struct sbus_dev *)dev;
279 int pg;
280 void *res;
281
282 snd_assert(size > 0, return NULL);
283 snd_assert(dma_addr != NULL, return NULL);
284 pg = get_order(size);
285 res = sbus_alloc_consistent(sdev, PAGE_SIZE * (1 << pg), dma_addr);
286 if (res != NULL)
287 inc_snd_pages(pg);
288 return res;
289}
290
291static void snd_free_sbus_pages(struct device *dev, size_t size,
292 void *ptr, dma_addr_t dma_addr)
293{
294 struct sbus_dev *sdev = (struct sbus_dev *)dev;
295 int pg;
296
297 if (ptr == NULL)
298 return;
299 pg = get_order(size);
300 dec_snd_pages(pg);
301 sbus_free_consistent(sdev, PAGE_SIZE * (1 << pg), ptr, dma_addr);
302}
303
304#endif /* CONFIG_SBUS */
305
306/*
307 *
308 * ALSA generic memory management
309 *
310 */
311
312
313/**
314 * snd_dma_alloc_pages - allocate the buffer area according to the given type
315 * @type: the DMA buffer type
316 * @device: the device pointer
317 * @size: the buffer size to allocate
318 * @dmab: buffer allocation record to store the allocated data
319 *
320 * Calls the memory-allocator function for the corresponding
321 * buffer type.
322 *
323 * Returns zero if the buffer with the given size is allocated successfuly,
324 * other a negative value at error.
325 */
326int snd_dma_alloc_pages(int type, struct device *device, size_t size,
327 struct snd_dma_buffer *dmab)
328{
329 snd_assert(size > 0, return -ENXIO);
330 snd_assert(dmab != NULL, return -ENXIO);
331
332 dmab->dev.type = type;
333 dmab->dev.dev = device;
334 dmab->bytes = 0;
335 switch (type) {
336 case SNDRV_DMA_TYPE_CONTINUOUS:
337 dmab->area = snd_malloc_pages(size, (unsigned long)device);
338 dmab->addr = 0;
339 break;
340#ifdef CONFIG_SBUS
341 case SNDRV_DMA_TYPE_SBUS:
342 dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr);
343 break;
344#endif
345 case SNDRV_DMA_TYPE_DEV:
346 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
347 break;
348 case SNDRV_DMA_TYPE_DEV_SG:
349 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
350 break;
351 default:
352 printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
353 dmab->area = NULL;
354 dmab->addr = 0;
355 return -ENXIO;
356 }
357 if (! dmab->area)
358 return -ENOMEM;
359 dmab->bytes = size;
360 return 0;
361}
362
363/**
364 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
365 * @type: the DMA buffer type
366 * @device: the device pointer
367 * @size: the buffer size to allocate
368 * @dmab: buffer allocation record to store the allocated data
369 *
370 * Calls the memory-allocator function for the corresponding
371 * buffer type. When no space is left, this function reduces the size and
372 * tries to allocate again. The size actually allocated is stored in
373 * res_size argument.
374 *
375 * Returns zero if the buffer with the given size is allocated successfuly,
376 * other a negative value at error.
377 */
378int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
379 struct snd_dma_buffer *dmab)
380{
381 int err;
382
383 snd_assert(size > 0, return -ENXIO);
384 snd_assert(dmab != NULL, return -ENXIO);
385
386 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
387 if (err != -ENOMEM)
388 return err;
389 size >>= 1;
390 if (size <= PAGE_SIZE)
391 return -ENOMEM;
392 }
393 if (! dmab->area)
394 return -ENOMEM;
395 return 0;
396}
397
398
399/**
400 * snd_dma_free_pages - release the allocated buffer
401 * @dmab: the buffer allocation record to release
402 *
403 * Releases the allocated buffer via snd_dma_alloc_pages().
404 */
405void snd_dma_free_pages(struct snd_dma_buffer *dmab)
406{
407 switch (dmab->dev.type) {
408 case SNDRV_DMA_TYPE_CONTINUOUS:
409 snd_free_pages(dmab->area, dmab->bytes);
410 break;
411#ifdef CONFIG_SBUS
412 case SNDRV_DMA_TYPE_SBUS:
413 snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
414 break;
415#endif
416 case SNDRV_DMA_TYPE_DEV:
417 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
418 break;
419 case SNDRV_DMA_TYPE_DEV_SG:
420 snd_free_sgbuf_pages(dmab);
421 break;
422 default:
423 printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
424 }
425}
426
427
428/**
429 * snd_dma_get_reserved - get the reserved buffer for the given device
430 * @dmab: the buffer allocation record to store
431 * @id: the buffer id
432 *
433 * Looks for the reserved-buffer list and re-uses if the same buffer
434 * is found in the list. When the buffer is found, it's removed from the free list.
435 *
436 * Returns the size of buffer if the buffer is found, or zero if not found.
437 */
438size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
439{
440 struct list_head *p;
441 struct snd_mem_list *mem;
442
443 snd_assert(dmab, return 0);
444
445 down(&list_mutex);
446 list_for_each(p, &mem_list_head) {
447 mem = list_entry(p, struct snd_mem_list, list);
448 if (mem->id == id &&
Takashi Iwaib6a96912005-05-30 18:27:03 +0200449 (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
450 ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
451 struct device *dev = dmab->dev.dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 list_del(p);
453 *dmab = mem->buffer;
Takashi Iwaib6a96912005-05-30 18:27:03 +0200454 if (dmab->dev.dev == NULL)
455 dmab->dev.dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 kfree(mem);
457 up(&list_mutex);
458 return dmab->bytes;
459 }
460 }
461 up(&list_mutex);
462 return 0;
463}
464
465/**
466 * snd_dma_reserve_buf - reserve the buffer
467 * @dmab: the buffer to reserve
468 * @id: the buffer id
469 *
470 * Reserves the given buffer as a reserved buffer.
471 *
472 * Returns zero if successful, or a negative code at error.
473 */
474int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
475{
476 struct snd_mem_list *mem;
477
478 snd_assert(dmab, return -EINVAL);
479 mem = kmalloc(sizeof(*mem), GFP_KERNEL);
480 if (! mem)
481 return -ENOMEM;
482 down(&list_mutex);
483 mem->buffer = *dmab;
484 mem->id = id;
485 list_add_tail(&mem->list, &mem_list_head);
486 up(&list_mutex);
487 return 0;
488}
489
490/*
491 * purge all reserved buffers
492 */
493static void free_all_reserved_pages(void)
494{
495 struct list_head *p;
496 struct snd_mem_list *mem;
497
498 down(&list_mutex);
499 while (! list_empty(&mem_list_head)) {
500 p = mem_list_head.next;
501 mem = list_entry(p, struct snd_mem_list, list);
502 list_del(p);
503 snd_dma_free_pages(&mem->buffer);
504 kfree(mem);
505 }
506 up(&list_mutex);
507}
508
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510#ifdef CONFIG_PROC_FS
511/*
512 * proc file interface
513 */
Takashi Iwaib6a96912005-05-30 18:27:03 +0200514#define SND_MEM_PROC_FILE "driver/snd-page-alloc"
515struct proc_dir_entry *snd_mem_proc;
516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517static int snd_mem_proc_read(char *page, char **start, off_t off,
518 int count, int *eof, void *data)
519{
520 int len = 0;
521 long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
522 struct list_head *p;
523 struct snd_mem_list *mem;
524 int devno;
525 static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" };
526
527 down(&list_mutex);
528 len += snprintf(page + len, count - len,
529 "pages : %li bytes (%li pages per %likB)\n",
530 pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
531 devno = 0;
532 list_for_each(p, &mem_list_head) {
533 mem = list_entry(p, struct snd_mem_list, list);
534 devno++;
535 len += snprintf(page + len, count - len,
536 "buffer %d : ID %08x : type %s\n",
537 devno, mem->id, types[mem->buffer.dev.type]);
538 len += snprintf(page + len, count - len,
539 " addr = 0x%lx, size = %d bytes\n",
540 (unsigned long)mem->buffer.addr, (int)mem->buffer.bytes);
541 }
542 up(&list_mutex);
543 return len;
544}
Takashi Iwaib6a96912005-05-30 18:27:03 +0200545
546/* FIXME: for pci only - other bus? */
547#ifdef CONFIG_PCI
548#define gettoken(bufp) strsep(bufp, " \t\n")
549
550static int snd_mem_proc_write(struct file *file, const char __user *buffer,
551 unsigned long count, void *data)
552{
553 char buf[128];
554 char *token, *p;
555
556 if (count > ARRAY_SIZE(buf) - 1)
557 count = ARRAY_SIZE(buf) - 1;
558 if (copy_from_user(buf, buffer, count))
559 return -EFAULT;
560 buf[ARRAY_SIZE(buf) - 1] = '\0';
561
562 p = buf;
563 token = gettoken(&p);
564 if (! token || *token == '#')
565 return (int)count;
566 if (strcmp(token, "add") == 0) {
567 char *endp;
568 int vendor, device, size, buffers;
569 long mask;
570 int i, alloced;
571 struct pci_dev *pci;
572
573 if ((token = gettoken(&p)) == NULL ||
574 (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
575 (token = gettoken(&p)) == NULL ||
576 (device = simple_strtol(token, NULL, 0)) <= 0 ||
577 (token = gettoken(&p)) == NULL ||
578 (mask = simple_strtol(token, NULL, 0)) < 0 ||
579 (token = gettoken(&p)) == NULL ||
580 (size = memparse(token, &endp)) < 64*1024 ||
581 size > 16*1024*1024 /* too big */ ||
582 (token = gettoken(&p)) == NULL ||
583 (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
584 buffers > 4) {
585 printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
586 return (int)count;
587 }
588 vendor &= 0xffff;
589 device &= 0xffff;
590
591 alloced = 0;
592 pci = NULL;
593 while ((pci = pci_find_device(vendor, device, pci)) != NULL) {
594 if (mask > 0 && mask < 0xffffffff) {
595 if (pci_set_dma_mask(pci, mask) < 0 ||
596 pci_set_consistent_dma_mask(pci, mask) < 0) {
597 printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
598 return (int)count;
599 }
600 }
601 for (i = 0; i < buffers; i++) {
602 struct snd_dma_buffer dmab;
603 memset(&dmab, 0, sizeof(dmab));
604 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
605 size, &dmab) < 0) {
606 printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
607 return (int)count;
608 }
609 snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
610 }
611 alloced++;
612 }
613 if (! alloced) {
614 for (i = 0; i < buffers; i++) {
615 struct snd_dma_buffer dmab;
616 memset(&dmab, 0, sizeof(dmab));
617 /* FIXME: We can allocate only in ZONE_DMA
618 * without a device pointer!
619 */
620 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
621 size, &dmab) < 0) {
622 printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
623 break;
624 }
625 snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
626 }
627 }
628 } else if (strcmp(token, "erase") == 0)
629 /* FIXME: need for releasing each buffer chunk? */
630 free_all_reserved_pages();
631 else
632 printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
633 return (int)count;
634}
635#endif /* CONFIG_PCI */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636#endif /* CONFIG_PROC_FS */
637
638/*
639 * module entry
640 */
641
642static int __init snd_mem_init(void)
643{
644#ifdef CONFIG_PROC_FS
Takashi Iwaib6a96912005-05-30 18:27:03 +0200645 snd_mem_proc = create_proc_entry(SND_MEM_PROC_FILE, 0644, NULL);
646 if (snd_mem_proc) {
647 snd_mem_proc->read_proc = snd_mem_proc_read;
648#ifdef CONFIG_PCI
649 snd_mem_proc->write_proc = snd_mem_proc_write;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650#endif
Takashi Iwaib6a96912005-05-30 18:27:03 +0200651 }
652#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 return 0;
654}
655
656static void __exit snd_mem_exit(void)
657{
Takashi Iwaib6a96912005-05-30 18:27:03 +0200658 if (snd_mem_proc)
659 remove_proc_entry(SND_MEM_PROC_FILE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 free_all_reserved_pages();
661 if (snd_allocated_pages > 0)
662 printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages);
663}
664
665
666module_init(snd_mem_init)
667module_exit(snd_mem_exit)
668
669
670/*
671 * exports
672 */
673EXPORT_SYMBOL(snd_dma_alloc_pages);
674EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
675EXPORT_SYMBOL(snd_dma_free_pages);
676
677EXPORT_SYMBOL(snd_dma_get_reserved_buf);
678EXPORT_SYMBOL(snd_dma_reserve_buf);
679
680EXPORT_SYMBOL(snd_malloc_pages);
681EXPORT_SYMBOL(snd_free_pages);