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 | ||
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 | ||
70 | #ifdef CONFIG_SND_DEBUG | |
71 | #define __ASTRING__(x) #x | |
72 | #define snd_assert(expr, args...) do {\ | |
73 | if (!(expr)) {\ | |
74 | printk(KERN_ERR "snd-malloc: BUG? (%s) (called from %p)\n", __ASTRING__(expr), __builtin_return_address(0));\ | |
75 | args;\ | |
76 | }\ | |
77 | } while (0) | |
78 | #else | |
79 | #define snd_assert(expr, args...) /**/ | |
80 | #endif | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * | |
84 | * Generic memory allocators | |
85 | * | |
86 | */ | |
87 | ||
88 | static long snd_allocated_pages; /* holding the number of allocated pages */ | |
89 | ||
90 | static inline void inc_snd_pages(int order) | |
91 | { | |
92 | snd_allocated_pages += 1 << order; | |
93 | } | |
94 | ||
95 | static inline void dec_snd_pages(int order) | |
96 | { | |
97 | snd_allocated_pages -= 1 << order; | |
98 | } | |
99 | ||
1da177e4 LT |
100 | /** |
101 | * snd_malloc_pages - allocate pages with the given size | |
102 | * @size: the size to allocate in bytes | |
103 | * @gfp_flags: the allocation conditions, GFP_XXX | |
104 | * | |
105 | * Allocates the physically contiguous pages with the given size. | |
106 | * | |
107 | * Returns the pointer of the buffer, or NULL if no enoguh memory. | |
108 | */ | |
1ef64e67 | 109 | void *snd_malloc_pages(size_t size, gfp_t gfp_flags) |
1da177e4 LT |
110 | { |
111 | int pg; | |
112 | void *res; | |
113 | ||
114 | snd_assert(size > 0, return NULL); | |
115 | snd_assert(gfp_flags != 0, return NULL); | |
f3d48f03 | 116 | gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */ |
1da177e4 | 117 | pg = get_order(size); |
2ba8c15c | 118 | if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) |
1da177e4 | 119 | inc_snd_pages(pg); |
1da177e4 LT |
120 | return res; |
121 | } | |
122 | ||
123 | /** | |
124 | * snd_free_pages - release the pages | |
125 | * @ptr: the buffer pointer to release | |
126 | * @size: the allocated buffer size | |
127 | * | |
128 | * Releases the buffer allocated via snd_malloc_pages(). | |
129 | */ | |
130 | void snd_free_pages(void *ptr, size_t size) | |
131 | { | |
132 | int pg; | |
133 | ||
134 | if (ptr == NULL) | |
135 | return; | |
136 | pg = get_order(size); | |
137 | dec_snd_pages(pg); | |
1da177e4 LT |
138 | free_pages((unsigned long) ptr, pg); |
139 | } | |
140 | ||
141 | /* | |
142 | * | |
143 | * Bus-specific memory allocators | |
144 | * | |
145 | */ | |
146 | ||
8f11551b | 147 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
148 | /* allocate the coherent DMA pages */ |
149 | static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma) | |
150 | { | |
151 | int pg; | |
152 | void *res; | |
1ef64e67 | 153 | gfp_t gfp_flags; |
1da177e4 LT |
154 | |
155 | snd_assert(size > 0, return NULL); | |
156 | snd_assert(dma != NULL, return NULL); | |
157 | pg = get_order(size); | |
158 | gfp_flags = GFP_KERNEL | |
f3d48f03 | 159 | | __GFP_COMP /* compound page lets parts be mapped */ |
1da177e4 LT |
160 | | __GFP_NORETRY /* don't trigger OOM-killer */ |
161 | | __GFP_NOWARN; /* no stack trace print - this call is non-critical */ | |
162 | res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags); | |
2ba8c15c | 163 | if (res != NULL) |
1da177e4 | 164 | inc_snd_pages(pg); |
1da177e4 LT |
165 | |
166 | return res; | |
167 | } | |
168 | ||
169 | /* free the coherent DMA pages */ | |
170 | static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr, | |
171 | dma_addr_t dma) | |
172 | { | |
173 | int pg; | |
174 | ||
175 | if (ptr == NULL) | |
176 | return; | |
177 | pg = get_order(size); | |
178 | dec_snd_pages(pg); | |
1da177e4 LT |
179 | dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma); |
180 | } | |
8f11551b | 181 | #endif /* CONFIG_HAS_DMA */ |
1da177e4 LT |
182 | |
183 | #ifdef CONFIG_SBUS | |
184 | ||
185 | static void *snd_malloc_sbus_pages(struct device *dev, size_t size, | |
186 | dma_addr_t *dma_addr) | |
187 | { | |
188 | struct sbus_dev *sdev = (struct sbus_dev *)dev; | |
189 | int pg; | |
190 | void *res; | |
191 | ||
192 | snd_assert(size > 0, return NULL); | |
193 | snd_assert(dma_addr != NULL, return NULL); | |
194 | pg = get_order(size); | |
738f2b7b DM |
195 | res = dma_alloc_coherent(&sdev->ofdev.dev, PAGE_SIZE * (1 << pg), |
196 | dma_addr, GFP_ATOMIC); | |
1da177e4 LT |
197 | if (res != NULL) |
198 | inc_snd_pages(pg); | |
199 | return res; | |
200 | } | |
201 | ||
202 | static void snd_free_sbus_pages(struct device *dev, size_t size, | |
203 | void *ptr, dma_addr_t dma_addr) | |
204 | { | |
205 | struct sbus_dev *sdev = (struct sbus_dev *)dev; | |
206 | int pg; | |
207 | ||
208 | if (ptr == NULL) | |
209 | return; | |
210 | pg = get_order(size); | |
211 | dec_snd_pages(pg); | |
738f2b7b DM |
212 | dma_free_coherent(&sdev->ofdev.dev, PAGE_SIZE * (1 << pg), |
213 | ptr, dma_addr); | |
1da177e4 LT |
214 | } |
215 | ||
216 | #endif /* CONFIG_SBUS */ | |
217 | ||
218 | /* | |
219 | * | |
220 | * ALSA generic memory management | |
221 | * | |
222 | */ | |
223 | ||
224 | ||
225 | /** | |
226 | * snd_dma_alloc_pages - allocate the buffer area according to the given type | |
227 | * @type: the DMA buffer type | |
228 | * @device: the device pointer | |
229 | * @size: the buffer size to allocate | |
230 | * @dmab: buffer allocation record to store the allocated data | |
231 | * | |
232 | * Calls the memory-allocator function for the corresponding | |
233 | * buffer type. | |
234 | * | |
235 | * Returns zero if the buffer with the given size is allocated successfuly, | |
236 | * other a negative value at error. | |
237 | */ | |
238 | int snd_dma_alloc_pages(int type, struct device *device, size_t size, | |
239 | struct snd_dma_buffer *dmab) | |
240 | { | |
241 | snd_assert(size > 0, return -ENXIO); | |
242 | snd_assert(dmab != NULL, return -ENXIO); | |
243 | ||
244 | dmab->dev.type = type; | |
245 | dmab->dev.dev = device; | |
246 | dmab->bytes = 0; | |
247 | switch (type) { | |
248 | case SNDRV_DMA_TYPE_CONTINUOUS: | |
249 | dmab->area = snd_malloc_pages(size, (unsigned long)device); | |
250 | dmab->addr = 0; | |
251 | break; | |
252 | #ifdef CONFIG_SBUS | |
253 | case SNDRV_DMA_TYPE_SBUS: | |
254 | dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr); | |
255 | break; | |
256 | #endif | |
8f11551b | 257 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
258 | case SNDRV_DMA_TYPE_DEV: |
259 | dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr); | |
260 | break; | |
261 | case SNDRV_DMA_TYPE_DEV_SG: | |
262 | snd_malloc_sgbuf_pages(device, size, dmab, NULL); | |
263 | break; | |
8f11551b | 264 | #endif |
1da177e4 LT |
265 | default: |
266 | printk(KERN_ERR "snd-malloc: invalid device type %d\n", type); | |
267 | dmab->area = NULL; | |
268 | dmab->addr = 0; | |
269 | return -ENXIO; | |
270 | } | |
271 | if (! dmab->area) | |
272 | return -ENOMEM; | |
273 | dmab->bytes = size; | |
274 | return 0; | |
275 | } | |
276 | ||
277 | /** | |
278 | * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback | |
279 | * @type: the DMA buffer type | |
280 | * @device: the device pointer | |
281 | * @size: the buffer size to allocate | |
282 | * @dmab: buffer allocation record to store the allocated data | |
283 | * | |
284 | * Calls the memory-allocator function for the corresponding | |
285 | * buffer type. When no space is left, this function reduces the size and | |
286 | * tries to allocate again. The size actually allocated is stored in | |
287 | * res_size argument. | |
288 | * | |
289 | * Returns zero if the buffer with the given size is allocated successfuly, | |
290 | * other a negative value at error. | |
291 | */ | |
292 | int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size, | |
293 | struct snd_dma_buffer *dmab) | |
294 | { | |
295 | int err; | |
296 | ||
297 | snd_assert(size > 0, return -ENXIO); | |
298 | snd_assert(dmab != NULL, return -ENXIO); | |
299 | ||
300 | while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) { | |
301 | if (err != -ENOMEM) | |
302 | return err; | |
303 | size >>= 1; | |
304 | if (size <= PAGE_SIZE) | |
305 | return -ENOMEM; | |
306 | } | |
307 | if (! dmab->area) | |
308 | return -ENOMEM; | |
309 | return 0; | |
310 | } | |
311 | ||
312 | ||
313 | /** | |
314 | * snd_dma_free_pages - release the allocated buffer | |
315 | * @dmab: the buffer allocation record to release | |
316 | * | |
317 | * Releases the allocated buffer via snd_dma_alloc_pages(). | |
318 | */ | |
319 | void snd_dma_free_pages(struct snd_dma_buffer *dmab) | |
320 | { | |
321 | switch (dmab->dev.type) { | |
322 | case SNDRV_DMA_TYPE_CONTINUOUS: | |
323 | snd_free_pages(dmab->area, dmab->bytes); | |
324 | break; | |
325 | #ifdef CONFIG_SBUS | |
326 | case SNDRV_DMA_TYPE_SBUS: | |
327 | snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); | |
328 | break; | |
329 | #endif | |
8f11551b | 330 | #ifdef CONFIG_HAS_DMA |
1da177e4 LT |
331 | case SNDRV_DMA_TYPE_DEV: |
332 | snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr); | |
333 | break; | |
334 | case SNDRV_DMA_TYPE_DEV_SG: | |
335 | snd_free_sgbuf_pages(dmab); | |
336 | break; | |
8f11551b | 337 | #endif |
1da177e4 LT |
338 | default: |
339 | printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type); | |
340 | } | |
341 | } | |
342 | ||
343 | ||
344 | /** | |
345 | * snd_dma_get_reserved - get the reserved buffer for the given device | |
346 | * @dmab: the buffer allocation record to store | |
347 | * @id: the buffer id | |
348 | * | |
349 | * Looks for the reserved-buffer list and re-uses if the same buffer | |
350 | * is found in the list. When the buffer is found, it's removed from the free list. | |
351 | * | |
352 | * Returns the size of buffer if the buffer is found, or zero if not found. | |
353 | */ | |
354 | size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id) | |
355 | { | |
1da177e4 LT |
356 | struct snd_mem_list *mem; |
357 | ||
358 | snd_assert(dmab, return 0); | |
359 | ||
1a60d4c5 | 360 | mutex_lock(&list_mutex); |
9244b2c3 | 361 | list_for_each_entry(mem, &mem_list_head, list) { |
1da177e4 | 362 | if (mem->id == id && |
b6a96915 TI |
363 | (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL || |
364 | ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) { | |
365 | struct device *dev = dmab->dev.dev; | |
9244b2c3 | 366 | list_del(&mem->list); |
1da177e4 | 367 | *dmab = mem->buffer; |
b6a96915 TI |
368 | if (dmab->dev.dev == NULL) |
369 | dmab->dev.dev = dev; | |
1da177e4 | 370 | kfree(mem); |
1a60d4c5 | 371 | mutex_unlock(&list_mutex); |
1da177e4 LT |
372 | return dmab->bytes; |
373 | } | |
374 | } | |
1a60d4c5 | 375 | mutex_unlock(&list_mutex); |
1da177e4 LT |
376 | return 0; |
377 | } | |
378 | ||
379 | /** | |
380 | * snd_dma_reserve_buf - reserve the buffer | |
381 | * @dmab: the buffer to reserve | |
382 | * @id: the buffer id | |
383 | * | |
384 | * Reserves the given buffer as a reserved buffer. | |
385 | * | |
386 | * Returns zero if successful, or a negative code at error. | |
387 | */ | |
388 | int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id) | |
389 | { | |
390 | struct snd_mem_list *mem; | |
391 | ||
392 | snd_assert(dmab, return -EINVAL); | |
393 | mem = kmalloc(sizeof(*mem), GFP_KERNEL); | |
394 | if (! mem) | |
395 | return -ENOMEM; | |
1a60d4c5 | 396 | mutex_lock(&list_mutex); |
1da177e4 LT |
397 | mem->buffer = *dmab; |
398 | mem->id = id; | |
399 | list_add_tail(&mem->list, &mem_list_head); | |
1a60d4c5 | 400 | mutex_unlock(&list_mutex); |
1da177e4 LT |
401 | return 0; |
402 | } | |
403 | ||
404 | /* | |
405 | * purge all reserved buffers | |
406 | */ | |
407 | static void free_all_reserved_pages(void) | |
408 | { | |
409 | struct list_head *p; | |
410 | struct snd_mem_list *mem; | |
411 | ||
1a60d4c5 | 412 | mutex_lock(&list_mutex); |
1da177e4 LT |
413 | while (! list_empty(&mem_list_head)) { |
414 | p = mem_list_head.next; | |
415 | mem = list_entry(p, struct snd_mem_list, list); | |
416 | list_del(p); | |
417 | snd_dma_free_pages(&mem->buffer); | |
418 | kfree(mem); | |
419 | } | |
1a60d4c5 | 420 | mutex_unlock(&list_mutex); |
1da177e4 LT |
421 | } |
422 | ||
423 | ||
1da177e4 LT |
424 | #ifdef CONFIG_PROC_FS |
425 | /* | |
426 | * proc file interface | |
427 | */ | |
b6a96915 | 428 | #define SND_MEM_PROC_FILE "driver/snd-page-alloc" |
a53fc188 | 429 | static struct proc_dir_entry *snd_mem_proc; |
b6a96915 | 430 | |
ccec6e2c | 431 | static int snd_mem_proc_read(struct seq_file *seq, void *offset) |
1da177e4 | 432 | { |
1da177e4 | 433 | long pages = snd_allocated_pages >> (PAGE_SHIFT-12); |
1da177e4 LT |
434 | struct snd_mem_list *mem; |
435 | int devno; | |
436 | static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" }; | |
437 | ||
1a60d4c5 | 438 | mutex_lock(&list_mutex); |
ccec6e2c TI |
439 | seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n", |
440 | pages * PAGE_SIZE, pages, PAGE_SIZE / 1024); | |
1da177e4 | 441 | devno = 0; |
9244b2c3 | 442 | list_for_each_entry(mem, &mem_list_head, list) { |
1da177e4 | 443 | devno++; |
ccec6e2c TI |
444 | seq_printf(seq, "buffer %d : ID %08x : type %s\n", |
445 | devno, mem->id, types[mem->buffer.dev.type]); | |
446 | seq_printf(seq, " addr = 0x%lx, size = %d bytes\n", | |
447 | (unsigned long)mem->buffer.addr, | |
448 | (int)mem->buffer.bytes); | |
1da177e4 | 449 | } |
1a60d4c5 | 450 | mutex_unlock(&list_mutex); |
ccec6e2c TI |
451 | return 0; |
452 | } | |
453 | ||
454 | static int snd_mem_proc_open(struct inode *inode, struct file *file) | |
455 | { | |
456 | return single_open(file, snd_mem_proc_read, NULL); | |
1da177e4 | 457 | } |
b6a96915 TI |
458 | |
459 | /* FIXME: for pci only - other bus? */ | |
460 | #ifdef CONFIG_PCI | |
461 | #define gettoken(bufp) strsep(bufp, " \t\n") | |
462 | ||
ccec6e2c TI |
463 | static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer, |
464 | size_t count, loff_t * ppos) | |
b6a96915 TI |
465 | { |
466 | char buf[128]; | |
467 | char *token, *p; | |
468 | ||
ccec6e2c TI |
469 | if (count > sizeof(buf) - 1) |
470 | return -EINVAL; | |
b6a96915 TI |
471 | if (copy_from_user(buf, buffer, count)) |
472 | return -EFAULT; | |
ccec6e2c | 473 | buf[count] = '\0'; |
b6a96915 TI |
474 | |
475 | p = buf; | |
476 | token = gettoken(&p); | |
477 | if (! token || *token == '#') | |
ccec6e2c | 478 | return count; |
b6a96915 TI |
479 | if (strcmp(token, "add") == 0) { |
480 | char *endp; | |
481 | int vendor, device, size, buffers; | |
482 | long mask; | |
483 | int i, alloced; | |
484 | struct pci_dev *pci; | |
485 | ||
486 | if ((token = gettoken(&p)) == NULL || | |
487 | (vendor = simple_strtol(token, NULL, 0)) <= 0 || | |
488 | (token = gettoken(&p)) == NULL || | |
489 | (device = simple_strtol(token, NULL, 0)) <= 0 || | |
490 | (token = gettoken(&p)) == NULL || | |
491 | (mask = simple_strtol(token, NULL, 0)) < 0 || | |
492 | (token = gettoken(&p)) == NULL || | |
493 | (size = memparse(token, &endp)) < 64*1024 || | |
494 | size > 16*1024*1024 /* too big */ || | |
495 | (token = gettoken(&p)) == NULL || | |
496 | (buffers = simple_strtol(token, NULL, 0)) <= 0 || | |
497 | buffers > 4) { | |
498 | printk(KERN_ERR "snd-page-alloc: invalid proc write format\n"); | |
ccec6e2c | 499 | return count; |
b6a96915 TI |
500 | } |
501 | vendor &= 0xffff; | |
502 | device &= 0xffff; | |
503 | ||
504 | alloced = 0; | |
505 | pci = NULL; | |
0dd119f7 | 506 | while ((pci = pci_get_device(vendor, device, pci)) != NULL) { |
b6a96915 TI |
507 | if (mask > 0 && mask < 0xffffffff) { |
508 | if (pci_set_dma_mask(pci, mask) < 0 || | |
509 | pci_set_consistent_dma_mask(pci, mask) < 0) { | |
510 | printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device); | |
df1deb67 | 511 | pci_dev_put(pci); |
ccec6e2c | 512 | return count; |
b6a96915 TI |
513 | } |
514 | } | |
515 | for (i = 0; i < buffers; i++) { | |
516 | struct snd_dma_buffer dmab; | |
517 | memset(&dmab, 0, sizeof(dmab)); | |
518 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci), | |
519 | size, &dmab) < 0) { | |
520 | printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size); | |
0dd119f7 | 521 | pci_dev_put(pci); |
ccec6e2c | 522 | return count; |
b6a96915 TI |
523 | } |
524 | snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci)); | |
525 | } | |
526 | alloced++; | |
527 | } | |
528 | if (! alloced) { | |
529 | for (i = 0; i < buffers; i++) { | |
530 | struct snd_dma_buffer dmab; | |
531 | memset(&dmab, 0, sizeof(dmab)); | |
532 | /* FIXME: We can allocate only in ZONE_DMA | |
533 | * without a device pointer! | |
534 | */ | |
535 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL, | |
536 | size, &dmab) < 0) { | |
537 | printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size); | |
538 | break; | |
539 | } | |
540 | snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device)); | |
541 | } | |
542 | } | |
543 | } else if (strcmp(token, "erase") == 0) | |
544 | /* FIXME: need for releasing each buffer chunk? */ | |
545 | free_all_reserved_pages(); | |
546 | else | |
547 | printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n"); | |
ccec6e2c | 548 | return count; |
b6a96915 TI |
549 | } |
550 | #endif /* CONFIG_PCI */ | |
ccec6e2c TI |
551 | |
552 | static const struct file_operations snd_mem_proc_fops = { | |
553 | .owner = THIS_MODULE, | |
554 | .open = snd_mem_proc_open, | |
555 | .read = seq_read, | |
556 | #ifdef CONFIG_PCI | |
557 | .write = snd_mem_proc_write, | |
558 | #endif | |
559 | .llseek = seq_lseek, | |
560 | .release = single_release, | |
561 | }; | |
562 | ||
1da177e4 LT |
563 | #endif /* CONFIG_PROC_FS */ |
564 | ||
565 | /* | |
566 | * module entry | |
567 | */ | |
568 | ||
569 | static int __init snd_mem_init(void) | |
570 | { | |
571 | #ifdef CONFIG_PROC_FS | |
7bf4e6d3 DL |
572 | snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL, |
573 | &snd_mem_proc_fops); | |
1da177e4 | 574 | #endif |
1da177e4 LT |
575 | return 0; |
576 | } | |
577 | ||
578 | static void __exit snd_mem_exit(void) | |
579 | { | |
e0be4d32 | 580 | remove_proc_entry(SND_MEM_PROC_FILE, NULL); |
1da177e4 LT |
581 | free_all_reserved_pages(); |
582 | if (snd_allocated_pages > 0) | |
583 | printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages); | |
584 | } | |
585 | ||
586 | ||
587 | module_init(snd_mem_init) | |
588 | module_exit(snd_mem_exit) | |
589 | ||
590 | ||
591 | /* | |
592 | * exports | |
593 | */ | |
594 | EXPORT_SYMBOL(snd_dma_alloc_pages); | |
595 | EXPORT_SYMBOL(snd_dma_alloc_pages_fallback); | |
596 | EXPORT_SYMBOL(snd_dma_free_pages); | |
597 | ||
598 | EXPORT_SYMBOL(snd_dma_get_reserved_buf); | |
599 | EXPORT_SYMBOL(snd_dma_reserve_buf); | |
600 | ||
601 | EXPORT_SYMBOL(snd_malloc_pages); | |
602 | EXPORT_SYMBOL(snd_free_pages); |