Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Digital Audio (PCM) abstract layer | |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
22 | #include <asm/io.h> |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
1da177e4 | 26 | #include <linux/moduleparam.h> |
ee7c343c | 27 | #include <linux/vmalloc.h> |
1da177e4 LT |
28 | #include <sound/core.h> |
29 | #include <sound/pcm.h> | |
30 | #include <sound/info.h> | |
31 | #include <sound/initval.h> | |
32 | ||
33 | static int preallocate_dma = 1; | |
34 | module_param(preallocate_dma, int, 0444); | |
35 | MODULE_PARM_DESC(preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized."); | |
36 | ||
37 | static int maximum_substreams = 4; | |
38 | module_param(maximum_substreams, int, 0444); | |
39 | MODULE_PARM_DESC(maximum_substreams, "Maximum substreams with preallocated DMA memory."); | |
40 | ||
41 | static const size_t snd_minimum_buffer = 16384; | |
42 | ||
43 | ||
44 | /* | |
45 | * try to allocate as the large pages as possible. | |
46 | * stores the resultant memory size in *res_size. | |
47 | * | |
48 | * the minimum size is snd_minimum_buffer. it should be power of 2. | |
49 | */ | |
877211f5 | 50 | static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size) |
1da177e4 LT |
51 | { |
52 | struct snd_dma_buffer *dmab = &substream->dma_buffer; | |
53 | int err; | |
54 | ||
1da177e4 LT |
55 | /* already reserved? */ |
56 | if (snd_dma_get_reserved_buf(dmab, substream->dma_buf_id) > 0) { | |
57 | if (dmab->bytes >= size) | |
58 | return 0; /* yes */ | |
59 | /* no, free the reserved block */ | |
60 | snd_dma_free_pages(dmab); | |
61 | dmab->bytes = 0; | |
62 | } | |
63 | ||
64 | do { | |
65 | if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, | |
66 | size, dmab)) < 0) { | |
67 | if (err != -ENOMEM) | |
68 | return err; /* fatal error */ | |
69 | } else | |
70 | return 0; | |
71 | size >>= 1; | |
72 | } while (size >= snd_minimum_buffer); | |
73 | dmab->bytes = 0; /* tell error */ | |
74 | return 0; | |
75 | } | |
76 | ||
77 | /* | |
78 | * release the preallocated buffer if not yet done. | |
79 | */ | |
877211f5 | 80 | static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream) |
1da177e4 LT |
81 | { |
82 | if (substream->dma_buffer.area == NULL) | |
83 | return; | |
84 | if (substream->dma_buf_id) | |
85 | snd_dma_reserve_buf(&substream->dma_buffer, substream->dma_buf_id); | |
86 | else | |
87 | snd_dma_free_pages(&substream->dma_buffer); | |
88 | substream->dma_buffer.area = NULL; | |
89 | } | |
90 | ||
91 | /** | |
92 | * snd_pcm_lib_preallocate_free - release the preallocated buffer of the specified substream. | |
93 | * @substream: the pcm substream instance | |
94 | * | |
95 | * Releases the pre-allocated buffer of the given substream. | |
96 | * | |
97 | * Returns zero if successful, or a negative error code on failure. | |
98 | */ | |
877211f5 | 99 | int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) |
1da177e4 LT |
100 | { |
101 | snd_pcm_lib_preallocate_dma_free(substream); | |
b7d90a35 | 102 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
c7132aeb JK |
103 | snd_info_free_entry(substream->proc_prealloc_max_entry); |
104 | substream->proc_prealloc_max_entry = NULL; | |
746d4a02 | 105 | snd_info_free_entry(substream->proc_prealloc_entry); |
e28563cc | 106 | substream->proc_prealloc_entry = NULL; |
b7d90a35 | 107 | #endif |
1da177e4 LT |
108 | return 0; |
109 | } | |
110 | ||
111 | /** | |
112 | * snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm | |
113 | * @pcm: the pcm instance | |
114 | * | |
115 | * Releases all the pre-allocated buffers on the given pcm. | |
116 | * | |
117 | * Returns zero if successful, or a negative error code on failure. | |
118 | */ | |
877211f5 | 119 | int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm) |
1da177e4 | 120 | { |
877211f5 | 121 | struct snd_pcm_substream *substream; |
1da177e4 LT |
122 | int stream; |
123 | ||
124 | for (stream = 0; stream < 2; stream++) | |
125 | for (substream = pcm->streams[stream].substream; substream; substream = substream->next) | |
126 | snd_pcm_lib_preallocate_free(substream); | |
127 | return 0; | |
128 | } | |
129 | ||
e88e8ae6 TI |
130 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); |
131 | ||
b7d90a35 | 132 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
1da177e4 LT |
133 | /* |
134 | * read callback for prealloc proc file | |
135 | * | |
136 | * prints the current allocated size in kB. | |
137 | */ | |
877211f5 TI |
138 | static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry, |
139 | struct snd_info_buffer *buffer) | |
1da177e4 | 140 | { |
877211f5 | 141 | struct snd_pcm_substream *substream = entry->private_data; |
1da177e4 LT |
142 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024); |
143 | } | |
144 | ||
c7132aeb JK |
145 | /* |
146 | * read callback for prealloc_max proc file | |
147 | * | |
148 | * prints the maximum allowed size in kB. | |
149 | */ | |
150 | static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry, | |
151 | struct snd_info_buffer *buffer) | |
152 | { | |
153 | struct snd_pcm_substream *substream = entry->private_data; | |
154 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* |
158 | * write callback for prealloc proc file | |
159 | * | |
160 | * accepts the preallocation size in kB. | |
161 | */ | |
877211f5 TI |
162 | static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, |
163 | struct snd_info_buffer *buffer) | |
1da177e4 | 164 | { |
877211f5 | 165 | struct snd_pcm_substream *substream = entry->private_data; |
1da177e4 LT |
166 | char line[64], str[64]; |
167 | size_t size; | |
168 | struct snd_dma_buffer new_dmab; | |
169 | ||
170 | if (substream->runtime) { | |
171 | buffer->error = -EBUSY; | |
172 | return; | |
173 | } | |
174 | if (!snd_info_get_line(buffer, line, sizeof(line))) { | |
175 | snd_info_get_str(str, line, sizeof(str)); | |
176 | size = simple_strtoul(str, NULL, 10) * 1024; | |
177 | if ((size != 0 && size < 8192) || size > substream->dma_max) { | |
178 | buffer->error = -EINVAL; | |
179 | return; | |
180 | } | |
181 | if (substream->dma_buffer.bytes == size) | |
182 | return; | |
183 | memset(&new_dmab, 0, sizeof(new_dmab)); | |
184 | new_dmab.dev = substream->dma_buffer.dev; | |
185 | if (size > 0) { | |
186 | if (snd_dma_alloc_pages(substream->dma_buffer.dev.type, | |
187 | substream->dma_buffer.dev.dev, | |
188 | size, &new_dmab) < 0) { | |
189 | buffer->error = -ENOMEM; | |
190 | return; | |
191 | } | |
192 | substream->buffer_bytes_max = size; | |
193 | } else { | |
194 | substream->buffer_bytes_max = UINT_MAX; | |
195 | } | |
196 | if (substream->dma_buffer.area) | |
197 | snd_dma_free_pages(&substream->dma_buffer); | |
198 | substream->dma_buffer = new_dmab; | |
199 | } else { | |
200 | buffer->error = -EINVAL; | |
201 | } | |
202 | } | |
203 | ||
e28563cc | 204 | static inline void preallocate_info_init(struct snd_pcm_substream *substream) |
1da177e4 | 205 | { |
877211f5 | 206 | struct snd_info_entry *entry; |
1da177e4 | 207 | |
1da177e4 | 208 | if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) { |
1da177e4 | 209 | entry->c.text.read = snd_pcm_lib_preallocate_proc_read; |
1da177e4 | 210 | entry->c.text.write = snd_pcm_lib_preallocate_proc_write; |
bd7bf042 | 211 | entry->mode |= S_IWUSR; |
1da177e4 LT |
212 | entry->private_data = substream; |
213 | if (snd_info_register(entry) < 0) { | |
214 | snd_info_free_entry(entry); | |
215 | entry = NULL; | |
216 | } | |
217 | } | |
218 | substream->proc_prealloc_entry = entry; | |
c7132aeb JK |
219 | if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) { |
220 | entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read; | |
221 | entry->private_data = substream; | |
222 | if (snd_info_register(entry) < 0) { | |
223 | snd_info_free_entry(entry); | |
224 | entry = NULL; | |
225 | } | |
226 | } | |
227 | substream->proc_prealloc_max_entry = entry; | |
e28563cc TI |
228 | } |
229 | ||
b7d90a35 | 230 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
e28563cc | 231 | #define preallocate_info_init(s) |
b7d90a35 | 232 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
e28563cc TI |
233 | |
234 | /* | |
235 | * pre-allocate the buffer and create a proc file for the substream | |
236 | */ | |
237 | static int snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream, | |
238 | size_t size, size_t max) | |
239 | { | |
240 | ||
241 | if (size > 0 && preallocate_dma && substream->number < maximum_substreams) | |
242 | preallocate_pcm_pages(substream, size); | |
243 | ||
244 | if (substream->dma_buffer.bytes > 0) | |
245 | substream->buffer_bytes_max = substream->dma_buffer.bytes; | |
246 | substream->dma_max = max; | |
247 | preallocate_info_init(substream); | |
1da177e4 LT |
248 | return 0; |
249 | } | |
250 | ||
251 | ||
252 | /** | |
253 | * snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type | |
254 | * @substream: the pcm substream instance | |
255 | * @type: DMA type (SNDRV_DMA_TYPE_*) | |
256 | * @data: DMA type dependant data | |
257 | * @size: the requested pre-allocation size in bytes | |
258 | * @max: the max. allowed pre-allocation size | |
259 | * | |
260 | * Do pre-allocation for the given DMA buffer type. | |
261 | * | |
262 | * When substream->dma_buf_id is set, the function tries to look for | |
263 | * the reserved buffer, and the buffer is not freed but reserved at | |
264 | * destruction time. The dma_buf_id must be unique for all systems | |
265 | * (in the same DMA buffer type) e.g. using snd_dma_pci_buf_id(). | |
266 | * | |
267 | * Returns zero if successful, or a negative error code on failure. | |
268 | */ | |
877211f5 | 269 | int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, |
1da177e4 LT |
270 | int type, struct device *data, |
271 | size_t size, size_t max) | |
272 | { | |
273 | substream->dma_buffer.dev.type = type; | |
274 | substream->dma_buffer.dev.dev = data; | |
275 | return snd_pcm_lib_preallocate_pages1(substream, size, max); | |
276 | } | |
277 | ||
e88e8ae6 TI |
278 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); |
279 | ||
1da177e4 LT |
280 | /** |
281 | * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continous memory type (all substreams) | |
df8db936 | 282 | * @pcm: the pcm instance |
1da177e4 LT |
283 | * @type: DMA type (SNDRV_DMA_TYPE_*) |
284 | * @data: DMA type dependant data | |
285 | * @size: the requested pre-allocation size in bytes | |
286 | * @max: the max. allowed pre-allocation size | |
287 | * | |
288 | * Do pre-allocation to all substreams of the given pcm for the | |
289 | * specified DMA type. | |
290 | * | |
291 | * Returns zero if successful, or a negative error code on failure. | |
292 | */ | |
877211f5 | 293 | int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, |
1da177e4 LT |
294 | int type, void *data, |
295 | size_t size, size_t max) | |
296 | { | |
877211f5 | 297 | struct snd_pcm_substream *substream; |
1da177e4 LT |
298 | int stream, err; |
299 | ||
300 | for (stream = 0; stream < 2; stream++) | |
301 | for (substream = pcm->streams[stream].substream; substream; substream = substream->next) | |
302 | if ((err = snd_pcm_lib_preallocate_pages(substream, type, data, size, max)) < 0) | |
303 | return err; | |
304 | return 0; | |
305 | } | |
306 | ||
e88e8ae6 TI |
307 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); |
308 | ||
cc6a8acd | 309 | #ifdef CONFIG_SND_DMA_SGBUF |
1da177e4 LT |
310 | /** |
311 | * snd_pcm_sgbuf_ops_page - get the page struct at the given offset | |
312 | * @substream: the pcm substream instance | |
313 | * @offset: the buffer offset | |
314 | * | |
315 | * Returns the page struct at the given buffer offset. | |
316 | * Used as the page callback of PCM ops. | |
317 | */ | |
877211f5 | 318 | struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset) |
1da177e4 LT |
319 | { |
320 | struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream); | |
321 | ||
322 | unsigned int idx = offset >> PAGE_SHIFT; | |
323 | if (idx >= (unsigned int)sgbuf->pages) | |
324 | return NULL; | |
325 | return sgbuf->page_table[idx]; | |
326 | } | |
327 | ||
e88e8ae6 TI |
328 | EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); |
329 | ||
51e9f2e6 TI |
330 | /* |
331 | * compute the max chunk size with continuous pages on sg-buffer | |
332 | */ | |
333 | unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, | |
334 | unsigned int ofs, unsigned int size) | |
335 | { | |
336 | struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); | |
337 | unsigned int start, end, pg; | |
338 | ||
339 | start = ofs >> PAGE_SHIFT; | |
340 | end = (ofs + size - 1) >> PAGE_SHIFT; | |
341 | /* check page continuity */ | |
342 | pg = sg->table[start].addr >> PAGE_SHIFT; | |
343 | for (;;) { | |
344 | start++; | |
345 | if (start > end) | |
346 | break; | |
347 | pg++; | |
348 | if ((sg->table[start].addr >> PAGE_SHIFT) != pg) | |
349 | return (start << PAGE_SHIFT) - ofs; | |
350 | } | |
351 | /* ok, all on continuous pages */ | |
352 | return size; | |
353 | } | |
354 | EXPORT_SYMBOL(snd_pcm_sgbuf_get_chunk_size); | |
cc6a8acd | 355 | #endif /* CONFIG_SND_DMA_SGBUF */ |
51e9f2e6 | 356 | |
1da177e4 LT |
357 | /** |
358 | * snd_pcm_lib_malloc_pages - allocate the DMA buffer | |
359 | * @substream: the substream to allocate the DMA buffer to | |
360 | * @size: the requested buffer size in bytes | |
361 | * | |
362 | * Allocates the DMA buffer on the BUS type given earlier to | |
363 | * snd_pcm_lib_preallocate_xxx_pages(). | |
364 | * | |
365 | * Returns 1 if the buffer is changed, 0 if not changed, or a negative | |
366 | * code on failure. | |
367 | */ | |
877211f5 | 368 | int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) |
1da177e4 | 369 | { |
877211f5 | 370 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
371 | struct snd_dma_buffer *dmab = NULL; |
372 | ||
7eaa943c TI |
373 | if (PCM_RUNTIME_CHECK(substream)) |
374 | return -EINVAL; | |
375 | if (snd_BUG_ON(substream->dma_buffer.dev.type == | |
376 | SNDRV_DMA_TYPE_UNKNOWN)) | |
377 | return -EINVAL; | |
1da177e4 | 378 | runtime = substream->runtime; |
1da177e4 LT |
379 | |
380 | if (runtime->dma_buffer_p) { | |
381 | /* perphaps, we might free the large DMA memory region | |
382 | to save some space here, but the actual solution | |
383 | costs us less time */ | |
384 | if (runtime->dma_buffer_p->bytes >= size) { | |
385 | runtime->dma_bytes = size; | |
386 | return 0; /* ok, do not change */ | |
387 | } | |
388 | snd_pcm_lib_free_pages(substream); | |
389 | } | |
877211f5 TI |
390 | if (substream->dma_buffer.area != NULL && |
391 | substream->dma_buffer.bytes >= size) { | |
1da177e4 LT |
392 | dmab = &substream->dma_buffer; /* use the pre-allocated buffer */ |
393 | } else { | |
ca2c0966 | 394 | dmab = kzalloc(sizeof(*dmab), GFP_KERNEL); |
1da177e4 LT |
395 | if (! dmab) |
396 | return -ENOMEM; | |
397 | dmab->dev = substream->dma_buffer.dev; | |
398 | if (snd_dma_alloc_pages(substream->dma_buffer.dev.type, | |
399 | substream->dma_buffer.dev.dev, | |
400 | size, dmab) < 0) { | |
401 | kfree(dmab); | |
402 | return -ENOMEM; | |
403 | } | |
404 | } | |
405 | snd_pcm_set_runtime_buffer(substream, dmab); | |
406 | runtime->dma_bytes = size; | |
407 | return 1; /* area was changed */ | |
408 | } | |
409 | ||
e88e8ae6 TI |
410 | EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); |
411 | ||
1da177e4 LT |
412 | /** |
413 | * snd_pcm_lib_free_pages - release the allocated DMA buffer. | |
414 | * @substream: the substream to release the DMA buffer | |
415 | * | |
416 | * Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages(). | |
417 | * | |
418 | * Returns zero if successful, or a negative error code on failure. | |
419 | */ | |
877211f5 | 420 | int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) |
1da177e4 | 421 | { |
877211f5 | 422 | struct snd_pcm_runtime *runtime; |
1da177e4 | 423 | |
7eaa943c TI |
424 | if (PCM_RUNTIME_CHECK(substream)) |
425 | return -EINVAL; | |
1da177e4 | 426 | runtime = substream->runtime; |
1da177e4 LT |
427 | if (runtime->dma_area == NULL) |
428 | return 0; | |
429 | if (runtime->dma_buffer_p != &substream->dma_buffer) { | |
430 | /* it's a newly allocated buffer. release it now. */ | |
431 | snd_dma_free_pages(runtime->dma_buffer_p); | |
432 | kfree(runtime->dma_buffer_p); | |
433 | } | |
434 | snd_pcm_set_runtime_buffer(substream, NULL); | |
435 | return 0; | |
436 | } | |
e88e8ae6 TI |
437 | |
438 | EXPORT_SYMBOL(snd_pcm_lib_free_pages); | |
681b84e1 CL |
439 | |
440 | int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, | |
441 | size_t size, gfp_t gfp_flags) | |
442 | { | |
443 | struct snd_pcm_runtime *runtime; | |
444 | ||
445 | if (PCM_RUNTIME_CHECK(substream)) | |
446 | return -EINVAL; | |
447 | runtime = substream->runtime; | |
448 | if (runtime->dma_area) { | |
449 | if (runtime->dma_bytes >= size) | |
450 | return 0; /* already large enough */ | |
451 | vfree(runtime->dma_area); | |
452 | } | |
453 | runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL); | |
454 | if (!runtime->dma_area) | |
455 | return -ENOMEM; | |
456 | runtime->dma_bytes = size; | |
457 | return 1; | |
458 | } | |
459 | EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer); | |
460 | ||
461 | /** | |
462 | * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer | |
463 | * @substream: the substream with a buffer allocated by | |
464 | * snd_pcm_lib_alloc_vmalloc_buffer() | |
465 | */ | |
466 | int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream) | |
467 | { | |
468 | struct snd_pcm_runtime *runtime; | |
469 | ||
470 | if (PCM_RUNTIME_CHECK(substream)) | |
471 | return -EINVAL; | |
472 | runtime = substream->runtime; | |
473 | vfree(runtime->dma_area); | |
474 | runtime->dma_area = NULL; | |
475 | return 0; | |
476 | } | |
477 | EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer); | |
478 | ||
479 | /** | |
480 | * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct | |
481 | * @substream: the substream with a buffer allocated by | |
482 | * snd_pcm_lib_alloc_vmalloc_buffer() | |
483 | * @offset: offset in the buffer | |
484 | * | |
485 | * This function is to be used as the page callback in the PCM ops. | |
486 | */ | |
487 | struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, | |
488 | unsigned long offset) | |
489 | { | |
490 | return vmalloc_to_page(substream->runtime->dma_area + offset); | |
491 | } | |
492 | EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page); |