Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c1017a4c | 2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
24 | #include <linux/module.h> |
25 | #include <linux/proc_fs.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/pci.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/mm.h> | |
ccec6e2c | 30 | #include <linux/seq_file.h> |
b6a96915 | 31 | #include <asm/uaccess.h> |
1da177e4 LT |
32 | #include <linux/dma-mapping.h> |
33 | #include <linux/moduleparam.h> | |
1a60d4c5 | 34 | #include <linux/mutex.h> |
1da177e4 LT |
35 | #include <sound/memalloc.h> |
36 | #ifdef CONFIG_SBUS | |
37 | #include <asm/sbus.h> | |
38 | #endif | |
39 | ||
40 | ||
c1017a4c | 41 | MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>"); |
1da177e4 LT |
42 | MODULE_DESCRIPTION("Memory allocator for ALSA system."); |
43 | MODULE_LICENSE("GPL"); | |
44 | ||
45 | ||
1da177e4 LT |
46 | /* |
47 | */ | |
48 | ||
1a60d4c5 | 49 | static DEFINE_MUTEX(list_mutex); |
1da177e4 LT |
50 | static LIST_HEAD(mem_list_head); |
51 | ||
52 | /* buffer preservation list */ | |
53 | struct snd_mem_list { | |
54 | struct snd_dma_buffer buffer; | |
55 | unsigned int id; | |
56 | struct list_head list; | |
57 | }; | |
58 | ||
59 | /* id for pre-allocated buffers */ | |
60 | #define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1 | |
61 | ||
1da177e4 LT |
62 | /* |
63 | * | |
64 | * Generic memory allocators | |
65 | * | |
66 | */ | |
67 | ||
68 | static long snd_allocated_pages; /* holding the number of allocated pages */ | |
69 | ||
70 | static inline void inc_snd_pages(int order) | |
71 | { | |
72 | snd_allocated_pages += 1 << order; | |
73 | } | |
74 | ||
75 | static inline void dec_snd_pages(int order) | |
76 | { | |
77 | snd_allocated_pages -= 1 << order; | |
78 | } | |
79 | ||
1da177e4 LT |
80 | /** |
81 | * snd_malloc_pages - allocate pages with the given size | |
82 | * @size: the size to allocate in bytes | |
83 | * @gfp_flags: the allocation conditions, GFP_XXX | |
84 | * | |
85 | * Allocates the physically contiguous pages with the given size. | |
86 | * | |
87 | * Returns the pointer of the buffer, or NULL if no enoguh memory. | |
88 | */ | |
1ef64e67 | 89 | void *snd_malloc_pages(size_t size, gfp_t gfp_flags) |
1da177e4 LT |
90 | { |
91 | int pg; | |
92 | void *res; | |
93 | ||
7eaa943c TI |
94 | if (WARN_ON(!size)) |
95 | return NULL; | |
96 | if (WARN_ON(!gfp_flags)) | |
97 | return NULL; | |
f3d48f03 | 98 | gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */ |
1da177e4 | 99 | pg = get_order(size); |
2ba8c15c | 100 | if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) |
1da177e4 | 101 | inc_snd_pages(pg); |
1da177e4 LT |
102 | return res; |
103 | } | |
104 | ||
105 | /** | |
106 | * snd_free_pages - release the pages | |
107 | * @ptr: the buffer pointer to release | |
108 | * @size: the allocated buffer size | |
109 | * | |
110 | * Releases the buffer allocated via snd_malloc_pages(). | |
111 | */ | |
112 | void snd_free_pages(void *ptr, size_t size) | |
113 | { | |
114 | int pg; | |
115 | ||
116 | if (ptr == NULL) | |
117 | return; | |
118 | pg = get_order(size); | |
119 | dec_snd_pages(pg); | |
1da177e4 LT |
120 | free_pages((unsigned long) ptr, pg); |
121 | } | |
122 | ||
123 | /* | |
124 | * | |
125 | * Bus-specific memory allocators | |
126 | * | |
127 | */ | |
128 | ||
8f11551b | 129 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
130 | /* allocate the coherent DMA pages */ |
131 | static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma) | |
132 | { | |
133 | int pg; | |
134 | void *res; | |
1ef64e67 | 135 | gfp_t gfp_flags; |
1da177e4 | 136 | |
7eaa943c TI |
137 | if (WARN_ON(!dma)) |
138 | return NULL; | |
1da177e4 LT |
139 | pg = get_order(size); |
140 | gfp_flags = GFP_KERNEL | |
f3d48f03 | 141 | | __GFP_COMP /* compound page lets parts be mapped */ |
1da177e4 LT |
142 | | __GFP_NORETRY /* don't trigger OOM-killer */ |
143 | | __GFP_NOWARN; /* no stack trace print - this call is non-critical */ | |
144 | res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags); | |
2ba8c15c | 145 | if (res != NULL) |
1da177e4 | 146 | inc_snd_pages(pg); |
1da177e4 LT |
147 | |
148 | return res; | |
149 | } | |
150 | ||
151 | /* free the coherent DMA pages */ | |
152 | static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr, | |
153 | dma_addr_t dma) | |
154 | { | |
155 | int pg; | |
156 | ||
157 | if (ptr == NULL) | |
158 | return; | |
159 | pg = get_order(size); | |
160 | dec_snd_pages(pg); | |
1da177e4 LT |
161 | dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma); |
162 | } | |
8f11551b | 163 | #endif /* CONFIG_HAS_DMA */ |
1da177e4 LT |
164 | |
165 | #ifdef CONFIG_SBUS | |
166 | ||
167 | static void *snd_malloc_sbus_pages(struct device *dev, size_t size, | |
168 | dma_addr_t *dma_addr) | |
169 | { | |
170 | struct sbus_dev *sdev = (struct sbus_dev *)dev; | |
171 | int pg; | |
172 | void *res; | |
173 | ||
7eaa943c TI |
174 | if (WARN_ON(!dma_addr)) |
175 | return NULL; | |
1da177e4 LT |
176 | pg = get_order(size); |
177 | res = sbus_alloc_consistent(sdev, PAGE_SIZE * (1 << pg), dma_addr); | |
178 | if (res != NULL) | |
179 | inc_snd_pages(pg); | |
180 | return res; | |
181 | } | |
182 | ||
183 | static void snd_free_sbus_pages(struct device *dev, size_t size, | |
184 | void *ptr, dma_addr_t dma_addr) | |
185 | { | |
186 | struct sbus_dev *sdev = (struct sbus_dev *)dev; | |
187 | int pg; | |
188 | ||
189 | if (ptr == NULL) | |
190 | return; | |
191 | pg = get_order(size); | |
192 | dec_snd_pages(pg); | |
193 | sbus_free_consistent(sdev, PAGE_SIZE * (1 << pg), ptr, dma_addr); | |
194 | } | |
195 | ||
196 | #endif /* CONFIG_SBUS */ | |
197 | ||
198 | /* | |
199 | * | |
200 | * ALSA generic memory management | |
201 | * | |
202 | */ | |
203 | ||
204 | ||
205 | /** | |
206 | * snd_dma_alloc_pages - allocate the buffer area according to the given type | |
207 | * @type: the DMA buffer type | |
208 | * @device: the device pointer | |
209 | * @size: the buffer size to allocate | |
210 | * @dmab: buffer allocation record to store the allocated data | |
211 | * | |
212 | * Calls the memory-allocator function for the corresponding | |
213 | * buffer type. | |
214 | * | |
215 | * Returns zero if the buffer with the given size is allocated successfuly, | |
216 | * other a negative value at error. | |
217 | */ | |
218 | int snd_dma_alloc_pages(int type, struct device *device, size_t size, | |
219 | struct snd_dma_buffer *dmab) | |
220 | { | |
7eaa943c TI |
221 | if (WARN_ON(!size)) |
222 | return -ENXIO; | |
223 | if (WARN_ON(!dmab)) | |
224 | return -ENXIO; | |
1da177e4 LT |
225 | |
226 | dmab->dev.type = type; | |
227 | dmab->dev.dev = device; | |
228 | dmab->bytes = 0; | |
229 | switch (type) { | |
230 | case SNDRV_DMA_TYPE_CONTINUOUS: | |
231 | dmab->area = snd_malloc_pages(size, (unsigned long)device); | |
232 | dmab->addr = 0; | |
233 | break; | |
234 | #ifdef CONFIG_SBUS | |
235 | case SNDRV_DMA_TYPE_SBUS: | |
236 | dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr); | |
237 | break; | |
238 | #endif | |
8f11551b | 239 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
240 | case SNDRV_DMA_TYPE_DEV: |
241 | dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr); | |
242 | break; | |
243 | case SNDRV_DMA_TYPE_DEV_SG: | |
244 | snd_malloc_sgbuf_pages(device, size, dmab, NULL); | |
245 | break; | |
8f11551b | 246 | #endif |
1da177e4 LT |
247 | default: |
248 | printk(KERN_ERR "snd-malloc: invalid device type %d\n", type); | |
249 | dmab->area = NULL; | |
250 | dmab->addr = 0; | |
251 | return -ENXIO; | |
252 | } | |
253 | if (! dmab->area) | |
254 | return -ENOMEM; | |
255 | dmab->bytes = size; | |
256 | return 0; | |
257 | } | |
258 | ||
259 | /** | |
260 | * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback | |
261 | * @type: the DMA buffer type | |
262 | * @device: the device pointer | |
263 | * @size: the buffer size to allocate | |
264 | * @dmab: buffer allocation record to store the allocated data | |
265 | * | |
266 | * Calls the memory-allocator function for the corresponding | |
267 | * buffer type. When no space is left, this function reduces the size and | |
268 | * tries to allocate again. The size actually allocated is stored in | |
269 | * res_size argument. | |
270 | * | |
271 | * Returns zero if the buffer with the given size is allocated successfuly, | |
272 | * other a negative value at error. | |
273 | */ | |
274 | int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size, | |
275 | struct snd_dma_buffer *dmab) | |
276 | { | |
277 | int err; | |
278 | ||
1da177e4 LT |
279 | while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) { |
280 | if (err != -ENOMEM) | |
281 | return err; | |
282 | size >>= 1; | |
283 | if (size <= PAGE_SIZE) | |
284 | return -ENOMEM; | |
285 | } | |
286 | if (! dmab->area) | |
287 | return -ENOMEM; | |
288 | return 0; | |
289 | } | |
290 | ||
291 | ||
292 | /** | |
293 | * snd_dma_free_pages - release the allocated buffer | |
294 | * @dmab: the buffer allocation record to release | |
295 | * | |
296 | * Releases the allocated buffer via snd_dma_alloc_pages(). | |
297 | */ | |
298 | void snd_dma_free_pages(struct snd_dma_buffer *dmab) | |
299 | { | |
300 | switch (dmab->dev.type) { | |
301 | case SNDRV_DMA_TYPE_CONTINUOUS: | |
302 | snd_free_pages(dmab->area, dmab->bytes); | |
303 | break; | |
304 | #ifdef CONFIG_SBUS | |
305 | case SNDRV_DMA_TYPE_SBUS: | |
306 | snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); | |
307 | break; | |
308 | #endif | |
8f11551b | 309 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
310 | case SNDRV_DMA_TYPE_DEV: |
311 | snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); | |
312 | break; | |
313 | case SNDRV_DMA_TYPE_DEV_SG: | |
314 | snd_free_sgbuf_pages(dmab); | |
315 | break; | |
8f11551b | 316 | #endif |
1da177e4 LT |
317 | default: |
318 | printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type); | |
319 | } | |
320 | } | |
321 | ||
322 | ||
323 | /** | |
324 | * snd_dma_get_reserved - get the reserved buffer for the given device | |
325 | * @dmab: the buffer allocation record to store | |
326 | * @id: the buffer id | |
327 | * | |
328 | * Looks for the reserved-buffer list and re-uses if the same buffer | |
329 | * is found in the list. When the buffer is found, it's removed from the free list. | |
330 | * | |
331 | * Returns the size of buffer if the buffer is found, or zero if not found. | |
332 | */ | |
333 | size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id) | |
334 | { | |
1da177e4 LT |
335 | struct snd_mem_list *mem; |
336 | ||
7eaa943c TI |
337 | if (WARN_ON(!dmab)) |
338 | return 0; | |
1da177e4 | 339 | |
1a60d4c5 | 340 | mutex_lock(&list_mutex); |
9244b2c3 | 341 | list_for_each_entry(mem, &mem_list_head, list) { |
1da177e4 | 342 | if (mem->id == id && |
b6a96915 TI |
343 | (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL || |
344 | ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) { | |
345 | struct device *dev = dmab->dev.dev; | |
9244b2c3 | 346 | list_del(&mem->list); |
1da177e4 | 347 | *dmab = mem->buffer; |
b6a96915 TI |
348 | if (dmab->dev.dev == NULL) |
349 | dmab->dev.dev = dev; | |
1da177e4 | 350 | kfree(mem); |
1a60d4c5 | 351 | mutex_unlock(&list_mutex); |
1da177e4 LT |
352 | return dmab->bytes; |
353 | } | |
354 | } | |
1a60d4c5 | 355 | mutex_unlock(&list_mutex); |
1da177e4 LT |
356 | return 0; |
357 | } | |
358 | ||
359 | /** | |
360 | * snd_dma_reserve_buf - reserve the buffer | |
361 | * @dmab: the buffer to reserve | |
362 | * @id: the buffer id | |
363 | * | |
364 | * Reserves the given buffer as a reserved buffer. | |
365 | * | |
366 | * Returns zero if successful, or a negative code at error. | |
367 | */ | |
368 | int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id) | |
369 | { | |
370 | struct snd_mem_list *mem; | |
371 | ||
7eaa943c TI |
372 | if (WARN_ON(!dmab)) |
373 | return -EINVAL; | |
1da177e4 LT |
374 | mem = kmalloc(sizeof(*mem), GFP_KERNEL); |
375 | if (! mem) | |
376 | return -ENOMEM; | |
1a60d4c5 | 377 | mutex_lock(&list_mutex); |
1da177e4 LT |
378 | mem->buffer = *dmab; |
379 | mem->id = id; | |
380 | list_add_tail(&mem->list, &mem_list_head); | |
1a60d4c5 | 381 | mutex_unlock(&list_mutex); |
1da177e4 LT |
382 | return 0; |
383 | } | |
384 | ||
385 | /* | |
386 | * purge all reserved buffers | |
387 | */ | |
388 | static void free_all_reserved_pages(void) | |
389 | { | |
390 | struct list_head *p; | |
391 | struct snd_mem_list *mem; | |
392 | ||
1a60d4c5 | 393 | mutex_lock(&list_mutex); |
1da177e4 LT |
394 | while (! list_empty(&mem_list_head)) { |
395 | p = mem_list_head.next; | |
396 | mem = list_entry(p, struct snd_mem_list, list); | |
397 | list_del(p); | |
398 | snd_dma_free_pages(&mem->buffer); | |
399 | kfree(mem); | |
400 | } | |
1a60d4c5 | 401 | mutex_unlock(&list_mutex); |
1da177e4 LT |
402 | } |
403 | ||
404 | ||
1da177e4 LT |
405 | #ifdef CONFIG_PROC_FS |
406 | /* | |
407 | * proc file interface | |
408 | */ | |
b6a96915 | 409 | #define SND_MEM_PROC_FILE "driver/snd-page-alloc" |
a53fc188 | 410 | static struct proc_dir_entry *snd_mem_proc; |
b6a96915 | 411 | |
ccec6e2c | 412 | static int snd_mem_proc_read(struct seq_file *seq, void *offset) |
1da177e4 | 413 | { |
1da177e4 | 414 | long pages = snd_allocated_pages >> (PAGE_SHIFT-12); |
1da177e4 LT |
415 | struct snd_mem_list *mem; |
416 | int devno; | |
417 | static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" }; | |
418 | ||
1a60d4c5 | 419 | mutex_lock(&list_mutex); |
ccec6e2c TI |
420 | seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n", |
421 | pages * PAGE_SIZE, pages, PAGE_SIZE / 1024); | |
1da177e4 | 422 | devno = 0; |
9244b2c3 | 423 | list_for_each_entry(mem, &mem_list_head, list) { |
1da177e4 | 424 | devno++; |
ccec6e2c TI |
425 | seq_printf(seq, "buffer %d : ID %08x : type %s\n", |
426 | devno, mem->id, types[mem->buffer.dev.type]); | |
427 | seq_printf(seq, " addr = 0x%lx, size = %d bytes\n", | |
428 | (unsigned long)mem->buffer.addr, | |
429 | (int)mem->buffer.bytes); | |
1da177e4 | 430 | } |
1a60d4c5 | 431 | mutex_unlock(&list_mutex); |
ccec6e2c TI |
432 | return 0; |
433 | } | |
434 | ||
435 | static int snd_mem_proc_open(struct inode *inode, struct file *file) | |
436 | { | |
437 | return single_open(file, snd_mem_proc_read, NULL); | |
1da177e4 | 438 | } |
b6a96915 TI |
439 | |
440 | /* FIXME: for pci only - other bus? */ | |
441 | #ifdef CONFIG_PCI | |
442 | #define gettoken(bufp) strsep(bufp, " \t\n") | |
443 | ||
ccec6e2c TI |
444 | static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer, |
445 | size_t count, loff_t * ppos) | |
b6a96915 TI |
446 | { |
447 | char buf[128]; | |
448 | char *token, *p; | |
449 | ||
ccec6e2c TI |
450 | if (count > sizeof(buf) - 1) |
451 | return -EINVAL; | |
b6a96915 TI |
452 | if (copy_from_user(buf, buffer, count)) |
453 | return -EFAULT; | |
ccec6e2c | 454 | buf[count] = '\0'; |
b6a96915 TI |
455 | |
456 | p = buf; | |
457 | token = gettoken(&p); | |
458 | if (! token || *token == '#') | |
ccec6e2c | 459 | return count; |
b6a96915 TI |
460 | if (strcmp(token, "add") == 0) { |
461 | char *endp; | |
462 | int vendor, device, size, buffers; | |
463 | long mask; | |
464 | int i, alloced; | |
465 | struct pci_dev *pci; | |
466 | ||
467 | if ((token = gettoken(&p)) == NULL || | |
468 | (vendor = simple_strtol(token, NULL, 0)) <= 0 || | |
469 | (token = gettoken(&p)) == NULL || | |
470 | (device = simple_strtol(token, NULL, 0)) <= 0 || | |
471 | (token = gettoken(&p)) == NULL || | |
472 | (mask = simple_strtol(token, NULL, 0)) < 0 || | |
473 | (token = gettoken(&p)) == NULL || | |
474 | (size = memparse(token, &endp)) < 64*1024 || | |
475 | size > 16*1024*1024 /* too big */ || | |
476 | (token = gettoken(&p)) == NULL || | |
477 | (buffers = simple_strtol(token, NULL, 0)) <= 0 || | |
478 | buffers > 4) { | |
479 | printk(KERN_ERR "snd-page-alloc: invalid proc write format\n"); | |
ccec6e2c | 480 | return count; |
b6a96915 TI |
481 | } |
482 | vendor &= 0xffff; | |
483 | device &= 0xffff; | |
484 | ||
485 | alloced = 0; | |
486 | pci = NULL; | |
0dd119f7 | 487 | while ((pci = pci_get_device(vendor, device, pci)) != NULL) { |
b6a96915 TI |
488 | if (mask > 0 && mask < 0xffffffff) { |
489 | if (pci_set_dma_mask(pci, mask) < 0 || | |
490 | pci_set_consistent_dma_mask(pci, mask) < 0) { | |
491 | printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device); | |
df1deb67 | 492 | pci_dev_put(pci); |
ccec6e2c | 493 | return count; |
b6a96915 TI |
494 | } |
495 | } | |
496 | for (i = 0; i < buffers; i++) { | |
497 | struct snd_dma_buffer dmab; | |
498 | memset(&dmab, 0, sizeof(dmab)); | |
499 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci), | |
500 | size, &dmab) < 0) { | |
501 | printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size); | |
0dd119f7 | 502 | pci_dev_put(pci); |
ccec6e2c | 503 | return count; |
b6a96915 TI |
504 | } |
505 | snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci)); | |
506 | } | |
507 | alloced++; | |
508 | } | |
509 | if (! alloced) { | |
510 | for (i = 0; i < buffers; i++) { | |
511 | struct snd_dma_buffer dmab; | |
512 | memset(&dmab, 0, sizeof(dmab)); | |
513 | /* FIXME: We can allocate only in ZONE_DMA | |
514 | * without a device pointer! | |
515 | */ | |
516 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL, | |
517 | size, &dmab) < 0) { | |
518 | printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size); | |
519 | break; | |
520 | } | |
521 | snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device)); | |
522 | } | |
523 | } | |
524 | } else if (strcmp(token, "erase") == 0) | |
525 | /* FIXME: need for releasing each buffer chunk? */ | |
526 | free_all_reserved_pages(); | |
527 | else | |
528 | printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n"); | |
ccec6e2c | 529 | return count; |
b6a96915 TI |
530 | } |
531 | #endif /* CONFIG_PCI */ | |
ccec6e2c TI |
532 | |
533 | static const struct file_operations snd_mem_proc_fops = { | |
534 | .owner = THIS_MODULE, | |
535 | .open = snd_mem_proc_open, | |
536 | .read = seq_read, | |
537 | #ifdef CONFIG_PCI | |
538 | .write = snd_mem_proc_write, | |
539 | #endif | |
540 | .llseek = seq_lseek, | |
541 | .release = single_release, | |
542 | }; | |
543 | ||
1da177e4 LT |
544 | #endif /* CONFIG_PROC_FS */ |
545 | ||
546 | /* | |
547 | * module entry | |
548 | */ | |
549 | ||
550 | static int __init snd_mem_init(void) | |
551 | { | |
552 | #ifdef CONFIG_PROC_FS | |
7bf4e6d3 DL |
553 | snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL, |
554 | &snd_mem_proc_fops); | |
1da177e4 | 555 | #endif |
1da177e4 LT |
556 | return 0; |
557 | } | |
558 | ||
559 | static void __exit snd_mem_exit(void) | |
560 | { | |
e0be4d32 | 561 | remove_proc_entry(SND_MEM_PROC_FILE, NULL); |
1da177e4 LT |
562 | free_all_reserved_pages(); |
563 | if (snd_allocated_pages > 0) | |
564 | printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages); | |
565 | } | |
566 | ||
567 | ||
568 | module_init(snd_mem_init) | |
569 | module_exit(snd_mem_exit) | |
570 | ||
571 | ||
572 | /* | |
573 | * exports | |
574 | */ | |
575 | EXPORT_SYMBOL(snd_dma_alloc_pages); | |
576 | EXPORT_SYMBOL(snd_dma_alloc_pages_fallback); | |
577 | EXPORT_SYMBOL(snd_dma_free_pages); | |
578 | ||
579 | EXPORT_SYMBOL(snd_dma_get_reserved_buf); | |
580 | EXPORT_SYMBOL(snd_dma_reserve_buf); | |
581 | ||
582 | EXPORT_SYMBOL(snd_malloc_pages); | |
583 | EXPORT_SYMBOL(snd_free_pages); |