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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 | ||
49 | void *snd_malloc_sgbuf_pages(struct device *device, | |
50 | size_t size, struct snd_dma_buffer *dmab, | |
51 | size_t *res_size); | |
52 | int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab); | |
53 | ||
54 | /* | |
55 | */ | |
56 | ||
1a60d4c5 | 57 | static DEFINE_MUTEX(list_mutex); |
1da177e4 LT |
58 | static LIST_HEAD(mem_list_head); |
59 | ||
60 | /* buffer preservation list */ | |
61 | struct snd_mem_list { | |
62 | struct snd_dma_buffer buffer; | |
63 | unsigned int id; | |
64 | struct list_head list; | |
65 | }; | |
66 | ||
67 | /* id for pre-allocated buffers */ | |
68 | #define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1 | |
69 | ||
1da177e4 LT |
70 | /* |
71 | * | |
72 | * Generic memory allocators | |
73 | * | |
74 | */ | |
75 | ||
76 | static long snd_allocated_pages; /* holding the number of allocated pages */ | |
77 | ||
78 | static inline void inc_snd_pages(int order) | |
79 | { | |
80 | snd_allocated_pages += 1 << order; | |
81 | } | |
82 | ||
83 | static inline void dec_snd_pages(int order) | |
84 | { | |
85 | snd_allocated_pages -= 1 << order; | |
86 | } | |
87 | ||
1da177e4 LT |
88 | /** |
89 | * snd_malloc_pages - allocate pages with the given size | |
90 | * @size: the size to allocate in bytes | |
91 | * @gfp_flags: the allocation conditions, GFP_XXX | |
92 | * | |
93 | * Allocates the physically contiguous pages with the given size. | |
94 | * | |
95 | * Returns the pointer of the buffer, or NULL if no enoguh memory. | |
96 | */ | |
1ef64e67 | 97 | void *snd_malloc_pages(size_t size, gfp_t gfp_flags) |
1da177e4 LT |
98 | { |
99 | int pg; | |
100 | void *res; | |
101 | ||
7eaa943c TI |
102 | if (WARN_ON(!size)) |
103 | return NULL; | |
104 | if (WARN_ON(!gfp_flags)) | |
105 | return NULL; | |
f3d48f03 | 106 | gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */ |
1da177e4 | 107 | pg = get_order(size); |
2ba8c15c | 108 | if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) |
1da177e4 | 109 | inc_snd_pages(pg); |
1da177e4 LT |
110 | return res; |
111 | } | |
112 | ||
113 | /** | |
114 | * snd_free_pages - release the pages | |
115 | * @ptr: the buffer pointer to release | |
116 | * @size: the allocated buffer size | |
117 | * | |
118 | * Releases the buffer allocated via snd_malloc_pages(). | |
119 | */ | |
120 | void snd_free_pages(void *ptr, size_t size) | |
121 | { | |
122 | int pg; | |
123 | ||
124 | if (ptr == NULL) | |
125 | return; | |
126 | pg = get_order(size); | |
127 | dec_snd_pages(pg); | |
1da177e4 LT |
128 | free_pages((unsigned long) ptr, pg); |
129 | } | |
130 | ||
131 | /* | |
132 | * | |
133 | * Bus-specific memory allocators | |
134 | * | |
135 | */ | |
136 | ||
8f11551b | 137 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
138 | /* allocate the coherent DMA pages */ |
139 | static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma) | |
140 | { | |
141 | int pg; | |
142 | void *res; | |
1ef64e67 | 143 | gfp_t gfp_flags; |
1da177e4 | 144 | |
7eaa943c TI |
145 | if (WARN_ON(!dma)) |
146 | return NULL; | |
1da177e4 LT |
147 | pg = get_order(size); |
148 | gfp_flags = GFP_KERNEL | |
f3d48f03 | 149 | | __GFP_COMP /* compound page lets parts be mapped */ |
1da177e4 LT |
150 | | __GFP_NORETRY /* don't trigger OOM-killer */ |
151 | | __GFP_NOWARN; /* no stack trace print - this call is non-critical */ | |
152 | res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags); | |
2ba8c15c | 153 | if (res != NULL) |
1da177e4 | 154 | inc_snd_pages(pg); |
1da177e4 LT |
155 | |
156 | return res; | |
157 | } | |
158 | ||
159 | /* free the coherent DMA pages */ | |
160 | static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr, | |
161 | dma_addr_t dma) | |
162 | { | |
163 | int pg; | |
164 | ||
165 | if (ptr == NULL) | |
166 | return; | |
167 | pg = get_order(size); | |
168 | dec_snd_pages(pg); | |
1da177e4 LT |
169 | dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma); |
170 | } | |
8f11551b | 171 | #endif /* CONFIG_HAS_DMA */ |
1da177e4 LT |
172 | |
173 | #ifdef CONFIG_SBUS | |
174 | ||
175 | static void *snd_malloc_sbus_pages(struct device *dev, size_t size, | |
176 | dma_addr_t *dma_addr) | |
177 | { | |
178 | struct sbus_dev *sdev = (struct sbus_dev *)dev; | |
179 | int pg; | |
180 | void *res; | |
181 | ||
7eaa943c TI |
182 | if (WARN_ON(!dma_addr)) |
183 | return NULL; | |
1da177e4 LT |
184 | pg = get_order(size); |
185 | res = sbus_alloc_consistent(sdev, PAGE_SIZE * (1 << pg), dma_addr); | |
186 | if (res != NULL) | |
187 | inc_snd_pages(pg); | |
188 | return res; | |
189 | } | |
190 | ||
191 | static void snd_free_sbus_pages(struct device *dev, size_t size, | |
192 | void *ptr, dma_addr_t dma_addr) | |
193 | { | |
194 | struct sbus_dev *sdev = (struct sbus_dev *)dev; | |
195 | int pg; | |
196 | ||
197 | if (ptr == NULL) | |
198 | return; | |
199 | pg = get_order(size); | |
200 | dec_snd_pages(pg); | |
201 | sbus_free_consistent(sdev, PAGE_SIZE * (1 << pg), ptr, dma_addr); | |
202 | } | |
203 | ||
204 | #endif /* CONFIG_SBUS */ | |
205 | ||
206 | /* | |
207 | * | |
208 | * ALSA generic memory management | |
209 | * | |
210 | */ | |
211 | ||
212 | ||
213 | /** | |
214 | * snd_dma_alloc_pages - allocate the buffer area according to the given type | |
215 | * @type: the DMA buffer type | |
216 | * @device: the device pointer | |
217 | * @size: the buffer size to allocate | |
218 | * @dmab: buffer allocation record to store the allocated data | |
219 | * | |
220 | * Calls the memory-allocator function for the corresponding | |
221 | * buffer type. | |
222 | * | |
223 | * Returns zero if the buffer with the given size is allocated successfuly, | |
224 | * other a negative value at error. | |
225 | */ | |
226 | int snd_dma_alloc_pages(int type, struct device *device, size_t size, | |
227 | struct snd_dma_buffer *dmab) | |
228 | { | |
7eaa943c TI |
229 | if (WARN_ON(!size)) |
230 | return -ENXIO; | |
231 | if (WARN_ON(!dmab)) | |
232 | return -ENXIO; | |
1da177e4 LT |
233 | |
234 | dmab->dev.type = type; | |
235 | dmab->dev.dev = device; | |
236 | dmab->bytes = 0; | |
237 | switch (type) { | |
238 | case SNDRV_DMA_TYPE_CONTINUOUS: | |
239 | dmab->area = snd_malloc_pages(size, (unsigned long)device); | |
240 | dmab->addr = 0; | |
241 | break; | |
242 | #ifdef CONFIG_SBUS | |
243 | case SNDRV_DMA_TYPE_SBUS: | |
244 | dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr); | |
245 | break; | |
246 | #endif | |
8f11551b | 247 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
248 | case SNDRV_DMA_TYPE_DEV: |
249 | dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr); | |
250 | break; | |
251 | case SNDRV_DMA_TYPE_DEV_SG: | |
252 | snd_malloc_sgbuf_pages(device, size, dmab, NULL); | |
253 | break; | |
8f11551b | 254 | #endif |
1da177e4 LT |
255 | default: |
256 | printk(KERN_ERR "snd-malloc: invalid device type %d\n", type); | |
257 | dmab->area = NULL; | |
258 | dmab->addr = 0; | |
259 | return -ENXIO; | |
260 | } | |
261 | if (! dmab->area) | |
262 | return -ENOMEM; | |
263 | dmab->bytes = size; | |
264 | return 0; | |
265 | } | |
266 | ||
267 | /** | |
268 | * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback | |
269 | * @type: the DMA buffer type | |
270 | * @device: the device pointer | |
271 | * @size: the buffer size to allocate | |
272 | * @dmab: buffer allocation record to store the allocated data | |
273 | * | |
274 | * Calls the memory-allocator function for the corresponding | |
275 | * buffer type. When no space is left, this function reduces the size and | |
276 | * tries to allocate again. The size actually allocated is stored in | |
277 | * res_size argument. | |
278 | * | |
279 | * Returns zero if the buffer with the given size is allocated successfuly, | |
280 | * other a negative value at error. | |
281 | */ | |
282 | int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size, | |
283 | struct snd_dma_buffer *dmab) | |
284 | { | |
285 | int err; | |
286 | ||
1da177e4 LT |
287 | while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) { |
288 | if (err != -ENOMEM) | |
289 | return err; | |
290 | size >>= 1; | |
291 | if (size <= PAGE_SIZE) | |
292 | return -ENOMEM; | |
293 | } | |
294 | if (! dmab->area) | |
295 | return -ENOMEM; | |
296 | return 0; | |
297 | } | |
298 | ||
299 | ||
300 | /** | |
301 | * snd_dma_free_pages - release the allocated buffer | |
302 | * @dmab: the buffer allocation record to release | |
303 | * | |
304 | * Releases the allocated buffer via snd_dma_alloc_pages(). | |
305 | */ | |
306 | void snd_dma_free_pages(struct snd_dma_buffer *dmab) | |
307 | { | |
308 | switch (dmab->dev.type) { | |
309 | case SNDRV_DMA_TYPE_CONTINUOUS: | |
310 | snd_free_pages(dmab->area, dmab->bytes); | |
311 | break; | |
312 | #ifdef CONFIG_SBUS | |
313 | case SNDRV_DMA_TYPE_SBUS: | |
314 | snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); | |
315 | break; | |
316 | #endif | |
8f11551b | 317 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
318 | case SNDRV_DMA_TYPE_DEV: |
319 | snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); | |
320 | break; | |
321 | case SNDRV_DMA_TYPE_DEV_SG: | |
322 | snd_free_sgbuf_pages(dmab); | |
323 | break; | |
8f11551b | 324 | #endif |
1da177e4 LT |
325 | default: |
326 | printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type); | |
327 | } | |
328 | } | |
329 | ||
330 | ||
331 | /** | |
332 | * snd_dma_get_reserved - get the reserved buffer for the given device | |
333 | * @dmab: the buffer allocation record to store | |
334 | * @id: the buffer id | |
335 | * | |
336 | * Looks for the reserved-buffer list and re-uses if the same buffer | |
337 | * is found in the list. When the buffer is found, it's removed from the free list. | |
338 | * | |
339 | * Returns the size of buffer if the buffer is found, or zero if not found. | |
340 | */ | |
341 | size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id) | |
342 | { | |
1da177e4 LT |
343 | struct snd_mem_list *mem; |
344 | ||
7eaa943c TI |
345 | if (WARN_ON(!dmab)) |
346 | return 0; | |
1da177e4 | 347 | |
1a60d4c5 | 348 | mutex_lock(&list_mutex); |
9244b2c3 | 349 | list_for_each_entry(mem, &mem_list_head, list) { |
1da177e4 | 350 | if (mem->id == id && |
b6a96915 TI |
351 | (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL || |
352 | ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) { | |
353 | struct device *dev = dmab->dev.dev; | |
9244b2c3 | 354 | list_del(&mem->list); |
1da177e4 | 355 | *dmab = mem->buffer; |
b6a96915 TI |
356 | if (dmab->dev.dev == NULL) |
357 | dmab->dev.dev = dev; | |
1da177e4 | 358 | kfree(mem); |
1a60d4c5 | 359 | mutex_unlock(&list_mutex); |
1da177e4 LT |
360 | return dmab->bytes; |
361 | } | |
362 | } | |
1a60d4c5 | 363 | mutex_unlock(&list_mutex); |
1da177e4 LT |
364 | return 0; |
365 | } | |
366 | ||
367 | /** | |
368 | * snd_dma_reserve_buf - reserve the buffer | |
369 | * @dmab: the buffer to reserve | |
370 | * @id: the buffer id | |
371 | * | |
372 | * Reserves the given buffer as a reserved buffer. | |
373 | * | |
374 | * Returns zero if successful, or a negative code at error. | |
375 | */ | |
376 | int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id) | |
377 | { | |
378 | struct snd_mem_list *mem; | |
379 | ||
7eaa943c TI |
380 | if (WARN_ON(!dmab)) |
381 | return -EINVAL; | |
1da177e4 LT |
382 | mem = kmalloc(sizeof(*mem), GFP_KERNEL); |
383 | if (! mem) | |
384 | return -ENOMEM; | |
1a60d4c5 | 385 | mutex_lock(&list_mutex); |
1da177e4 LT |
386 | mem->buffer = *dmab; |
387 | mem->id = id; | |
388 | list_add_tail(&mem->list, &mem_list_head); | |
1a60d4c5 | 389 | mutex_unlock(&list_mutex); |
1da177e4 LT |
390 | return 0; |
391 | } | |
392 | ||
393 | /* | |
394 | * purge all reserved buffers | |
395 | */ | |
396 | static void free_all_reserved_pages(void) | |
397 | { | |
398 | struct list_head *p; | |
399 | struct snd_mem_list *mem; | |
400 | ||
1a60d4c5 | 401 | mutex_lock(&list_mutex); |
1da177e4 LT |
402 | while (! list_empty(&mem_list_head)) { |
403 | p = mem_list_head.next; | |
404 | mem = list_entry(p, struct snd_mem_list, list); | |
405 | list_del(p); | |
406 | snd_dma_free_pages(&mem->buffer); | |
407 | kfree(mem); | |
408 | } | |
1a60d4c5 | 409 | mutex_unlock(&list_mutex); |
1da177e4 LT |
410 | } |
411 | ||
412 | ||
1da177e4 LT |
413 | #ifdef CONFIG_PROC_FS |
414 | /* | |
415 | * proc file interface | |
416 | */ | |
b6a96915 | 417 | #define SND_MEM_PROC_FILE "driver/snd-page-alloc" |
a53fc188 | 418 | static struct proc_dir_entry *snd_mem_proc; |
b6a96915 | 419 | |
ccec6e2c | 420 | static int snd_mem_proc_read(struct seq_file *seq, void *offset) |
1da177e4 | 421 | { |
1da177e4 | 422 | long pages = snd_allocated_pages >> (PAGE_SHIFT-12); |
1da177e4 LT |
423 | struct snd_mem_list *mem; |
424 | int devno; | |
425 | static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" }; | |
426 | ||
1a60d4c5 | 427 | mutex_lock(&list_mutex); |
ccec6e2c TI |
428 | seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n", |
429 | pages * PAGE_SIZE, pages, PAGE_SIZE / 1024); | |
1da177e4 | 430 | devno = 0; |
9244b2c3 | 431 | list_for_each_entry(mem, &mem_list_head, list) { |
1da177e4 | 432 | devno++; |
ccec6e2c TI |
433 | seq_printf(seq, "buffer %d : ID %08x : type %s\n", |
434 | devno, mem->id, types[mem->buffer.dev.type]); | |
435 | seq_printf(seq, " addr = 0x%lx, size = %d bytes\n", | |
436 | (unsigned long)mem->buffer.addr, | |
437 | (int)mem->buffer.bytes); | |
1da177e4 | 438 | } |
1a60d4c5 | 439 | mutex_unlock(&list_mutex); |
ccec6e2c TI |
440 | return 0; |
441 | } | |
442 | ||
443 | static int snd_mem_proc_open(struct inode *inode, struct file *file) | |
444 | { | |
445 | return single_open(file, snd_mem_proc_read, NULL); | |
1da177e4 | 446 | } |
b6a96915 TI |
447 | |
448 | /* FIXME: for pci only - other bus? */ | |
449 | #ifdef CONFIG_PCI | |
450 | #define gettoken(bufp) strsep(bufp, " \t\n") | |
451 | ||
ccec6e2c TI |
452 | static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer, |
453 | size_t count, loff_t * ppos) | |
b6a96915 TI |
454 | { |
455 | char buf[128]; | |
456 | char *token, *p; | |
457 | ||
ccec6e2c TI |
458 | if (count > sizeof(buf) - 1) |
459 | return -EINVAL; | |
b6a96915 TI |
460 | if (copy_from_user(buf, buffer, count)) |
461 | return -EFAULT; | |
ccec6e2c | 462 | buf[count] = '\0'; |
b6a96915 TI |
463 | |
464 | p = buf; | |
465 | token = gettoken(&p); | |
466 | if (! token || *token == '#') | |
ccec6e2c | 467 | return count; |
b6a96915 TI |
468 | if (strcmp(token, "add") == 0) { |
469 | char *endp; | |
470 | int vendor, device, size, buffers; | |
471 | long mask; | |
472 | int i, alloced; | |
473 | struct pci_dev *pci; | |
474 | ||
475 | if ((token = gettoken(&p)) == NULL || | |
476 | (vendor = simple_strtol(token, NULL, 0)) <= 0 || | |
477 | (token = gettoken(&p)) == NULL || | |
478 | (device = simple_strtol(token, NULL, 0)) <= 0 || | |
479 | (token = gettoken(&p)) == NULL || | |
480 | (mask = simple_strtol(token, NULL, 0)) < 0 || | |
481 | (token = gettoken(&p)) == NULL || | |
482 | (size = memparse(token, &endp)) < 64*1024 || | |
483 | size > 16*1024*1024 /* too big */ || | |
484 | (token = gettoken(&p)) == NULL || | |
485 | (buffers = simple_strtol(token, NULL, 0)) <= 0 || | |
486 | buffers > 4) { | |
487 | printk(KERN_ERR "snd-page-alloc: invalid proc write format\n"); | |
ccec6e2c | 488 | return count; |
b6a96915 TI |
489 | } |
490 | vendor &= 0xffff; | |
491 | device &= 0xffff; | |
492 | ||
493 | alloced = 0; | |
494 | pci = NULL; | |
0dd119f7 | 495 | while ((pci = pci_get_device(vendor, device, pci)) != NULL) { |
b6a96915 TI |
496 | if (mask > 0 && mask < 0xffffffff) { |
497 | if (pci_set_dma_mask(pci, mask) < 0 || | |
498 | pci_set_consistent_dma_mask(pci, mask) < 0) { | |
499 | printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device); | |
df1deb67 | 500 | pci_dev_put(pci); |
ccec6e2c | 501 | return count; |
b6a96915 TI |
502 | } |
503 | } | |
504 | for (i = 0; i < buffers; i++) { | |
505 | struct snd_dma_buffer dmab; | |
506 | memset(&dmab, 0, sizeof(dmab)); | |
507 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci), | |
508 | size, &dmab) < 0) { | |
509 | printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size); | |
0dd119f7 | 510 | pci_dev_put(pci); |
ccec6e2c | 511 | return count; |
b6a96915 TI |
512 | } |
513 | snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci)); | |
514 | } | |
515 | alloced++; | |
516 | } | |
517 | if (! alloced) { | |
518 | for (i = 0; i < buffers; i++) { | |
519 | struct snd_dma_buffer dmab; | |
520 | memset(&dmab, 0, sizeof(dmab)); | |
521 | /* FIXME: We can allocate only in ZONE_DMA | |
522 | * without a device pointer! | |
523 | */ | |
524 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL, | |
525 | size, &dmab) < 0) { | |
526 | printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size); | |
527 | break; | |
528 | } | |
529 | snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device)); | |
530 | } | |
531 | } | |
532 | } else if (strcmp(token, "erase") == 0) | |
533 | /* FIXME: need for releasing each buffer chunk? */ | |
534 | free_all_reserved_pages(); | |
535 | else | |
536 | printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n"); | |
ccec6e2c | 537 | return count; |
b6a96915 TI |
538 | } |
539 | #endif /* CONFIG_PCI */ | |
ccec6e2c TI |
540 | |
541 | static const struct file_operations snd_mem_proc_fops = { | |
542 | .owner = THIS_MODULE, | |
543 | .open = snd_mem_proc_open, | |
544 | .read = seq_read, | |
545 | #ifdef CONFIG_PCI | |
546 | .write = snd_mem_proc_write, | |
547 | #endif | |
548 | .llseek = seq_lseek, | |
549 | .release = single_release, | |
550 | }; | |
551 | ||
1da177e4 LT |
552 | #endif /* CONFIG_PROC_FS */ |
553 | ||
554 | /* | |
555 | * module entry | |
556 | */ | |
557 | ||
558 | static int __init snd_mem_init(void) | |
559 | { | |
560 | #ifdef CONFIG_PROC_FS | |
7bf4e6d3 DL |
561 | snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL, |
562 | &snd_mem_proc_fops); | |
1da177e4 | 563 | #endif |
1da177e4 LT |
564 | return 0; |
565 | } | |
566 | ||
567 | static void __exit snd_mem_exit(void) | |
568 | { | |
e0be4d32 | 569 | remove_proc_entry(SND_MEM_PROC_FILE, NULL); |
1da177e4 LT |
570 | free_all_reserved_pages(); |
571 | if (snd_allocated_pages > 0) | |
572 | printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages); | |
573 | } | |
574 | ||
575 | ||
576 | module_init(snd_mem_init) | |
577 | module_exit(snd_mem_exit) | |
578 | ||
579 | ||
580 | /* | |
581 | * exports | |
582 | */ | |
583 | EXPORT_SYMBOL(snd_dma_alloc_pages); | |
584 | EXPORT_SYMBOL(snd_dma_alloc_pages_fallback); | |
585 | EXPORT_SYMBOL(snd_dma_free_pages); | |
586 | ||
587 | EXPORT_SYMBOL(snd_dma_get_reserved_buf); | |
588 | EXPORT_SYMBOL(snd_dma_reserve_buf); | |
589 | ||
590 | EXPORT_SYMBOL(snd_malloc_pages); | |
591 | EXPORT_SYMBOL(snd_free_pages); |