Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Digital Audio (PCM) abstract layer | |
c1017a4c | 4 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
5 | */ |
6 | ||
6cbbfe1c | 7 | #include <linux/io.h> |
1da177e4 LT |
8 | #include <linux/time.h> |
9 | #include <linux/init.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
1da177e4 | 11 | #include <linux/moduleparam.h> |
ee7c343c | 12 | #include <linux/vmalloc.h> |
d81a6d71 | 13 | #include <linux/export.h> |
1da177e4 LT |
14 | #include <sound/core.h> |
15 | #include <sound/pcm.h> | |
16 | #include <sound/info.h> | |
17 | #include <sound/initval.h> | |
0821fd77 | 18 | #include "pcm_local.h" |
1da177e4 LT |
19 | |
20 | static int preallocate_dma = 1; | |
21 | module_param(preallocate_dma, int, 0444); | |
22 | MODULE_PARM_DESC(preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized."); | |
23 | ||
24 | static int maximum_substreams = 4; | |
25 | module_param(maximum_substreams, int, 0444); | |
26 | MODULE_PARM_DESC(maximum_substreams, "Maximum substreams with preallocated DMA memory."); | |
27 | ||
28 | static const size_t snd_minimum_buffer = 16384; | |
29 | ||
d4cfb30f TI |
30 | static unsigned long max_alloc_per_card = 32UL * 1024UL * 1024UL; |
31 | module_param(max_alloc_per_card, ulong, 0644); | |
32 | MODULE_PARM_DESC(max_alloc_per_card, "Max total allocation bytes per card."); | |
33 | ||
bd55842e TI |
34 | static void __update_allocated_size(struct snd_card *card, ssize_t bytes) |
35 | { | |
36 | card->total_pcm_alloc_bytes += bytes; | |
37 | } | |
38 | ||
39 | static void update_allocated_size(struct snd_card *card, ssize_t bytes) | |
40 | { | |
41 | mutex_lock(&card->memory_mutex); | |
42 | __update_allocated_size(card, bytes); | |
43 | mutex_unlock(&card->memory_mutex); | |
44 | } | |
45 | ||
46 | static void decrease_allocated_size(struct snd_card *card, size_t bytes) | |
47 | { | |
48 | mutex_lock(&card->memory_mutex); | |
49 | WARN_ON(card->total_pcm_alloc_bytes < bytes); | |
50 | __update_allocated_size(card, -(ssize_t)bytes); | |
51 | mutex_unlock(&card->memory_mutex); | |
52 | } | |
53 | ||
d4cfb30f | 54 | static int do_alloc_pages(struct snd_card *card, int type, struct device *dev, |
a25684a9 | 55 | int str, size_t size, struct snd_dma_buffer *dmab) |
d4cfb30f | 56 | { |
a25684a9 | 57 | enum dma_data_direction dir; |
d4cfb30f TI |
58 | int err; |
59 | ||
bd55842e TI |
60 | /* check and reserve the requested size */ |
61 | mutex_lock(&card->memory_mutex); | |
d4cfb30f | 62 | if (max_alloc_per_card && |
bd55842e TI |
63 | card->total_pcm_alloc_bytes + size > max_alloc_per_card) { |
64 | mutex_unlock(&card->memory_mutex); | |
d4cfb30f | 65 | return -ENOMEM; |
bd55842e TI |
66 | } |
67 | __update_allocated_size(card, size); | |
68 | mutex_unlock(&card->memory_mutex); | |
3ad796cb | 69 | |
a25684a9 TI |
70 | if (str == SNDRV_PCM_STREAM_PLAYBACK) |
71 | dir = DMA_TO_DEVICE; | |
72 | else | |
73 | dir = DMA_FROM_DEVICE; | |
74 | err = snd_dma_alloc_dir_pages(type, dev, dir, size, dmab); | |
d4cfb30f | 75 | if (!err) { |
bd55842e TI |
76 | /* the actual allocation size might be bigger than requested, |
77 | * and we need to correct the account | |
78 | */ | |
79 | if (dmab->bytes != size) | |
80 | update_allocated_size(card, dmab->bytes - size); | |
81 | } else { | |
82 | /* take back on allocation failure */ | |
83 | decrease_allocated_size(card, size); | |
d4cfb30f TI |
84 | } |
85 | return err; | |
86 | } | |
87 | ||
88 | static void do_free_pages(struct snd_card *card, struct snd_dma_buffer *dmab) | |
89 | { | |
90 | if (!dmab->area) | |
91 | return; | |
bd55842e | 92 | decrease_allocated_size(card, dmab->bytes); |
d4cfb30f TI |
93 | snd_dma_free_pages(dmab); |
94 | dmab->area = NULL; | |
95 | } | |
1da177e4 LT |
96 | |
97 | /* | |
98 | * try to allocate as the large pages as possible. | |
99 | * stores the resultant memory size in *res_size. | |
100 | * | |
101 | * the minimum size is snd_minimum_buffer. it should be power of 2. | |
102 | */ | |
ac9245a5 TI |
103 | static int preallocate_pcm_pages(struct snd_pcm_substream *substream, |
104 | size_t size, bool no_fallback) | |
1da177e4 LT |
105 | { |
106 | struct snd_dma_buffer *dmab = &substream->dma_buffer; | |
d4cfb30f | 107 | struct snd_card *card = substream->pcm->card; |
6ab08ced | 108 | size_t orig_size = size; |
1da177e4 LT |
109 | int err; |
110 | ||
1da177e4 | 111 | do { |
d4cfb30f | 112 | err = do_alloc_pages(card, dmab->dev.type, dmab->dev.dev, |
a25684a9 | 113 | substream->stream, size, dmab); |
d4cfb30f TI |
114 | if (err != -ENOMEM) |
115 | return err; | |
ac9245a5 TI |
116 | if (no_fallback) |
117 | break; | |
1da177e4 LT |
118 | size >>= 1; |
119 | } while (size >= snd_minimum_buffer); | |
120 | dmab->bytes = 0; /* tell error */ | |
6ab08ced TI |
121 | pr_warn("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", |
122 | substream->pcm->card->number, substream->pcm->device, | |
123 | substream->stream ? 'c' : 'p', substream->number, | |
124 | substream->pcm->name, orig_size); | |
ac9245a5 | 125 | return -ENOMEM; |
1da177e4 LT |
126 | } |
127 | ||
1da177e4 LT |
128 | /** |
129 | * snd_pcm_lib_preallocate_free - release the preallocated buffer of the specified substream. | |
130 | * @substream: the pcm substream instance | |
131 | * | |
132 | * Releases the pre-allocated buffer of the given substream. | |
1da177e4 | 133 | */ |
bb580602 | 134 | void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) |
1da177e4 | 135 | { |
f2283366 | 136 | do_free_pages(substream->pcm->card, &substream->dma_buffer); |
1da177e4 LT |
137 | } |
138 | ||
139 | /** | |
140 | * snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm | |
141 | * @pcm: the pcm instance | |
142 | * | |
143 | * Releases all the pre-allocated buffers on the given pcm. | |
1da177e4 | 144 | */ |
bb580602 | 145 | void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm) |
1da177e4 | 146 | { |
877211f5 | 147 | struct snd_pcm_substream *substream; |
1da177e4 LT |
148 | int stream; |
149 | ||
8d19b4e0 TI |
150 | for_each_pcm_substream(pcm, stream, substream) |
151 | snd_pcm_lib_preallocate_free(substream); | |
1da177e4 | 152 | } |
e88e8ae6 TI |
153 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); |
154 | ||
b7d90a35 | 155 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
1da177e4 LT |
156 | /* |
157 | * read callback for prealloc proc file | |
158 | * | |
159 | * prints the current allocated size in kB. | |
160 | */ | |
877211f5 TI |
161 | static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry, |
162 | struct snd_info_buffer *buffer) | |
1da177e4 | 163 | { |
877211f5 | 164 | struct snd_pcm_substream *substream = entry->private_data; |
1da177e4 LT |
165 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024); |
166 | } | |
167 | ||
c7132aeb JK |
168 | /* |
169 | * read callback for prealloc_max proc file | |
170 | * | |
171 | * prints the maximum allowed size in kB. | |
172 | */ | |
173 | static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry, | |
174 | struct snd_info_buffer *buffer) | |
175 | { | |
176 | struct snd_pcm_substream *substream = entry->private_data; | |
177 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024); | |
178 | } | |
179 | ||
1da177e4 LT |
180 | /* |
181 | * write callback for prealloc proc file | |
182 | * | |
183 | * accepts the preallocation size in kB. | |
184 | */ | |
877211f5 TI |
185 | static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, |
186 | struct snd_info_buffer *buffer) | |
1da177e4 | 187 | { |
877211f5 | 188 | struct snd_pcm_substream *substream = entry->private_data; |
d4cfb30f | 189 | struct snd_card *card = substream->pcm->card; |
1da177e4 LT |
190 | char line[64], str[64]; |
191 | size_t size; | |
192 | struct snd_dma_buffer new_dmab; | |
193 | ||
69534c48 | 194 | mutex_lock(&substream->pcm->open_mutex); |
1da177e4 LT |
195 | if (substream->runtime) { |
196 | buffer->error = -EBUSY; | |
69534c48 | 197 | goto unlock; |
1da177e4 LT |
198 | } |
199 | if (!snd_info_get_line(buffer, line, sizeof(line))) { | |
200 | snd_info_get_str(str, line, sizeof(str)); | |
201 | size = simple_strtoul(str, NULL, 10) * 1024; | |
202 | if ((size != 0 && size < 8192) || size > substream->dma_max) { | |
203 | buffer->error = -EINVAL; | |
69534c48 | 204 | goto unlock; |
1da177e4 LT |
205 | } |
206 | if (substream->dma_buffer.bytes == size) | |
69534c48 | 207 | goto unlock; |
1da177e4 LT |
208 | memset(&new_dmab, 0, sizeof(new_dmab)); |
209 | new_dmab.dev = substream->dma_buffer.dev; | |
210 | if (size > 0) { | |
d4cfb30f TI |
211 | if (do_alloc_pages(card, |
212 | substream->dma_buffer.dev.type, | |
213 | substream->dma_buffer.dev.dev, | |
a25684a9 | 214 | substream->stream, |
d4cfb30f | 215 | size, &new_dmab) < 0) { |
1da177e4 | 216 | buffer->error = -ENOMEM; |
dc85fc9d AS |
217 | pr_debug("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", |
218 | substream->pcm->card->number, substream->pcm->device, | |
219 | substream->stream ? 'c' : 'p', substream->number, | |
220 | substream->pcm->name, size); | |
69534c48 | 221 | goto unlock; |
1da177e4 LT |
222 | } |
223 | substream->buffer_bytes_max = size; | |
224 | } else { | |
225 | substream->buffer_bytes_max = UINT_MAX; | |
226 | } | |
227 | if (substream->dma_buffer.area) | |
d4cfb30f | 228 | do_free_pages(card, &substream->dma_buffer); |
1da177e4 LT |
229 | substream->dma_buffer = new_dmab; |
230 | } else { | |
231 | buffer->error = -EINVAL; | |
232 | } | |
69534c48 TI |
233 | unlock: |
234 | mutex_unlock(&substream->pcm->open_mutex); | |
1da177e4 LT |
235 | } |
236 | ||
e28563cc | 237 | static inline void preallocate_info_init(struct snd_pcm_substream *substream) |
1da177e4 | 238 | { |
877211f5 | 239 | struct snd_info_entry *entry; |
1da177e4 | 240 | |
a8d14981 TI |
241 | entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", |
242 | substream->proc_root); | |
243 | if (entry) { | |
244 | snd_info_set_text_ops(entry, substream, | |
245 | snd_pcm_lib_preallocate_proc_read); | |
1da177e4 | 246 | entry->c.text.write = snd_pcm_lib_preallocate_proc_write; |
6a73cf46 | 247 | entry->mode |= 0200; |
c7132aeb | 248 | } |
a8d14981 TI |
249 | entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", |
250 | substream->proc_root); | |
251 | if (entry) | |
252 | snd_info_set_text_ops(entry, substream, | |
253 | snd_pcm_lib_preallocate_max_proc_read); | |
e28563cc TI |
254 | } |
255 | ||
b7d90a35 | 256 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
940ba1f5 AB |
257 | static inline void preallocate_info_init(struct snd_pcm_substream *substream) |
258 | { | |
259 | } | |
b7d90a35 | 260 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
e28563cc TI |
261 | |
262 | /* | |
263 | * pre-allocate the buffer and create a proc file for the substream | |
264 | */ | |
ac9245a5 | 265 | static int preallocate_pages(struct snd_pcm_substream *substream, |
0dba808e TI |
266 | int type, struct device *data, |
267 | size_t size, size_t max, bool managed) | |
e28563cc | 268 | { |
ac9245a5 TI |
269 | int err; |
270 | ||
0dba808e | 271 | if (snd_BUG_ON(substream->dma_buffer.dev.type)) |
ac9245a5 | 272 | return -EINVAL; |
0dba808e TI |
273 | |
274 | substream->dma_buffer.dev.type = type; | |
275 | substream->dma_buffer.dev.dev = data; | |
e28563cc | 276 | |
ac9245a5 TI |
277 | if (size > 0) { |
278 | if (!max) { | |
279 | /* no fallback, only also inform -ENOMEM */ | |
280 | err = preallocate_pcm_pages(substream, size, true); | |
281 | if (err < 0) | |
282 | return err; | |
283 | } else if (preallocate_dma && | |
284 | substream->number < maximum_substreams) { | |
285 | err = preallocate_pcm_pages(substream, size, false); | |
286 | if (err < 0 && err != -ENOMEM) | |
287 | return err; | |
288 | } | |
289 | } | |
e28563cc TI |
290 | |
291 | if (substream->dma_buffer.bytes > 0) | |
292 | substream->buffer_bytes_max = substream->dma_buffer.bytes; | |
293 | substream->dma_max = max; | |
d3978991 TI |
294 | if (max > 0) |
295 | preallocate_info_init(substream); | |
0dba808e TI |
296 | if (managed) |
297 | substream->managed_buffer_alloc = 1; | |
ac9245a5 | 298 | return 0; |
1da177e4 LT |
299 | } |
300 | ||
ac9245a5 | 301 | static int preallocate_pages_for_all(struct snd_pcm *pcm, int type, |
0dba808e TI |
302 | void *data, size_t size, size_t max, |
303 | bool managed) | |
304 | { | |
305 | struct snd_pcm_substream *substream; | |
ac9245a5 | 306 | int stream, err; |
0dba808e | 307 | |
ac9245a5 TI |
308 | for_each_pcm_substream(pcm, stream, substream) { |
309 | err = preallocate_pages(substream, type, data, size, max, managed); | |
310 | if (err < 0) | |
311 | return err; | |
312 | } | |
313 | return 0; | |
0dba808e | 314 | } |
1da177e4 LT |
315 | |
316 | /** | |
317 | * snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type | |
318 | * @substream: the pcm substream instance | |
319 | * @type: DMA type (SNDRV_DMA_TYPE_*) | |
25985edc | 320 | * @data: DMA type dependent data |
1da177e4 LT |
321 | * @size: the requested pre-allocation size in bytes |
322 | * @max: the max. allowed pre-allocation size | |
323 | * | |
324 | * Do pre-allocation for the given DMA buffer type. | |
1da177e4 | 325 | */ |
bb580602 | 326 | void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, |
1da177e4 LT |
327 | int type, struct device *data, |
328 | size_t size, size_t max) | |
329 | { | |
0dba808e | 330 | preallocate_pages(substream, type, data, size, max, false); |
1da177e4 | 331 | } |
e88e8ae6 TI |
332 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); |
333 | ||
1da177e4 | 334 | /** |
25985edc | 335 | * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continuous memory type (all substreams) |
df8db936 | 336 | * @pcm: the pcm instance |
1da177e4 | 337 | * @type: DMA type (SNDRV_DMA_TYPE_*) |
25985edc | 338 | * @data: DMA type dependent data |
1da177e4 LT |
339 | * @size: the requested pre-allocation size in bytes |
340 | * @max: the max. allowed pre-allocation size | |
341 | * | |
342 | * Do pre-allocation to all substreams of the given pcm for the | |
343 | * specified DMA type. | |
1da177e4 | 344 | */ |
bb580602 | 345 | void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, |
1da177e4 LT |
346 | int type, void *data, |
347 | size_t size, size_t max) | |
348 | { | |
0dba808e | 349 | preallocate_pages_for_all(pcm, type, data, size, max, false); |
1da177e4 | 350 | } |
e88e8ae6 TI |
351 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); |
352 | ||
0dba808e TI |
353 | /** |
354 | * snd_pcm_set_managed_buffer - set up buffer management for a substream | |
355 | * @substream: the pcm substream instance | |
356 | * @type: DMA type (SNDRV_DMA_TYPE_*) | |
357 | * @data: DMA type dependent data | |
358 | * @size: the requested pre-allocation size in bytes | |
359 | * @max: the max. allowed pre-allocation size | |
360 | * | |
361 | * Do pre-allocation for the given DMA buffer type, and set the managed | |
362 | * buffer allocation mode to the given substream. | |
363 | * In this mode, PCM core will allocate a buffer automatically before PCM | |
364 | * hw_params ops call, and release the buffer after PCM hw_free ops call | |
365 | * as well, so that the driver doesn't need to invoke the allocation and | |
366 | * the release explicitly in its callback. | |
367 | * When a buffer is actually allocated before the PCM hw_params call, it | |
368 | * turns on the runtime buffer_changed flag for drivers changing their h/w | |
369 | * parameters accordingly. | |
ac9245a5 TI |
370 | * |
371 | * When @size is non-zero and @max is zero, this tries to allocate for only | |
372 | * the exact buffer size without fallback, and may return -ENOMEM. | |
373 | * Otherwise, the function tries to allocate smaller chunks if the allocation | |
374 | * fails. This is the behavior of snd_pcm_set_fixed_buffer(). | |
375 | * | |
376 | * When both @size and @max are zero, the function only sets up the buffer | |
377 | * for later dynamic allocations. It's used typically for buffers with | |
378 | * SNDRV_DMA_TYPE_VMALLOC type. | |
379 | * | |
380 | * Upon successful buffer allocation and setup, the function returns 0. | |
4e2b7067 TI |
381 | * |
382 | * Return: zero if successful, or a negative error code | |
0dba808e | 383 | */ |
ac9245a5 | 384 | int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, |
0dba808e TI |
385 | struct device *data, size_t size, size_t max) |
386 | { | |
ac9245a5 | 387 | return preallocate_pages(substream, type, data, size, max, true); |
0dba808e TI |
388 | } |
389 | EXPORT_SYMBOL(snd_pcm_set_managed_buffer); | |
390 | ||
391 | /** | |
392 | * snd_pcm_set_managed_buffer_all - set up buffer management for all substreams | |
393 | * for all substreams | |
394 | * @pcm: the pcm instance | |
395 | * @type: DMA type (SNDRV_DMA_TYPE_*) | |
396 | * @data: DMA type dependent data | |
397 | * @size: the requested pre-allocation size in bytes | |
398 | * @max: the max. allowed pre-allocation size | |
399 | * | |
400 | * Do pre-allocation to all substreams of the given pcm for the specified DMA | |
401 | * type and size, and set the managed_buffer_alloc flag to each substream. | |
4e2b7067 TI |
402 | * |
403 | * Return: zero if successful, or a negative error code | |
0dba808e | 404 | */ |
ac9245a5 TI |
405 | int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, |
406 | struct device *data, | |
407 | size_t size, size_t max) | |
0dba808e | 408 | { |
ac9245a5 | 409 | return preallocate_pages_for_all(pcm, type, data, size, max, true); |
0dba808e TI |
410 | } |
411 | EXPORT_SYMBOL(snd_pcm_set_managed_buffer_all); | |
412 | ||
1da177e4 LT |
413 | /** |
414 | * snd_pcm_lib_malloc_pages - allocate the DMA buffer | |
415 | * @substream: the substream to allocate the DMA buffer to | |
416 | * @size: the requested buffer size in bytes | |
417 | * | |
418 | * Allocates the DMA buffer on the BUS type given earlier to | |
419 | * snd_pcm_lib_preallocate_xxx_pages(). | |
420 | * | |
eb7c06e8 | 421 | * Return: 1 if the buffer is changed, 0 if not changed, or a negative |
1da177e4 LT |
422 | * code on failure. |
423 | */ | |
877211f5 | 424 | int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) |
1da177e4 | 425 | { |
b658cbab | 426 | struct snd_card *card; |
877211f5 | 427 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
428 | struct snd_dma_buffer *dmab = NULL; |
429 | ||
7eaa943c TI |
430 | if (PCM_RUNTIME_CHECK(substream)) |
431 | return -EINVAL; | |
432 | if (snd_BUG_ON(substream->dma_buffer.dev.type == | |
433 | SNDRV_DMA_TYPE_UNKNOWN)) | |
434 | return -EINVAL; | |
1da177e4 | 435 | runtime = substream->runtime; |
b658cbab | 436 | card = substream->pcm->card; |
1da177e4 LT |
437 | |
438 | if (runtime->dma_buffer_p) { | |
439 | /* perphaps, we might free the large DMA memory region | |
440 | to save some space here, but the actual solution | |
441 | costs us less time */ | |
442 | if (runtime->dma_buffer_p->bytes >= size) { | |
443 | runtime->dma_bytes = size; | |
444 | return 0; /* ok, do not change */ | |
445 | } | |
446 | snd_pcm_lib_free_pages(substream); | |
447 | } | |
877211f5 TI |
448 | if (substream->dma_buffer.area != NULL && |
449 | substream->dma_buffer.bytes >= size) { | |
1da177e4 LT |
450 | dmab = &substream->dma_buffer; /* use the pre-allocated buffer */ |
451 | } else { | |
ac9245a5 TI |
452 | /* dma_max=0 means the fixed size preallocation */ |
453 | if (substream->dma_buffer.area && !substream->dma_max) | |
454 | return -ENOMEM; | |
ca2c0966 | 455 | dmab = kzalloc(sizeof(*dmab), GFP_KERNEL); |
1da177e4 LT |
456 | if (! dmab) |
457 | return -ENOMEM; | |
458 | dmab->dev = substream->dma_buffer.dev; | |
d4cfb30f TI |
459 | if (do_alloc_pages(card, |
460 | substream->dma_buffer.dev.type, | |
461 | substream->dma_buffer.dev.dev, | |
a25684a9 | 462 | substream->stream, |
d4cfb30f | 463 | size, dmab) < 0) { |
1da177e4 | 464 | kfree(dmab); |
dc85fc9d AS |
465 | pr_debug("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", |
466 | substream->pcm->card->number, substream->pcm->device, | |
467 | substream->stream ? 'c' : 'p', substream->number, | |
468 | substream->pcm->name, size); | |
1da177e4 LT |
469 | return -ENOMEM; |
470 | } | |
471 | } | |
472 | snd_pcm_set_runtime_buffer(substream, dmab); | |
473 | runtime->dma_bytes = size; | |
474 | return 1; /* area was changed */ | |
475 | } | |
e88e8ae6 TI |
476 | EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); |
477 | ||
1da177e4 LT |
478 | /** |
479 | * snd_pcm_lib_free_pages - release the allocated DMA buffer. | |
480 | * @substream: the substream to release the DMA buffer | |
481 | * | |
482 | * Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages(). | |
483 | * | |
eb7c06e8 | 484 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 485 | */ |
877211f5 | 486 | int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) |
1da177e4 | 487 | { |
877211f5 | 488 | struct snd_pcm_runtime *runtime; |
1da177e4 | 489 | |
7eaa943c TI |
490 | if (PCM_RUNTIME_CHECK(substream)) |
491 | return -EINVAL; | |
1da177e4 | 492 | runtime = substream->runtime; |
1da177e4 LT |
493 | if (runtime->dma_area == NULL) |
494 | return 0; | |
495 | if (runtime->dma_buffer_p != &substream->dma_buffer) { | |
011b559b CIK |
496 | struct snd_card *card = substream->pcm->card; |
497 | ||
1da177e4 | 498 | /* it's a newly allocated buffer. release it now. */ |
d4cfb30f | 499 | do_free_pages(card, runtime->dma_buffer_p); |
1da177e4 LT |
500 | kfree(runtime->dma_buffer_p); |
501 | } | |
502 | snd_pcm_set_runtime_buffer(substream, NULL); | |
503 | return 0; | |
504 | } | |
e88e8ae6 | 505 | EXPORT_SYMBOL(snd_pcm_lib_free_pages); |
681b84e1 CL |
506 | |
507 | int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, | |
508 | size_t size, gfp_t gfp_flags) | |
509 | { | |
510 | struct snd_pcm_runtime *runtime; | |
511 | ||
512 | if (PCM_RUNTIME_CHECK(substream)) | |
513 | return -EINVAL; | |
514 | runtime = substream->runtime; | |
515 | if (runtime->dma_area) { | |
516 | if (runtime->dma_bytes >= size) | |
517 | return 0; /* already large enough */ | |
518 | vfree(runtime->dma_area); | |
519 | } | |
88dca4ca | 520 | runtime->dma_area = __vmalloc(size, gfp_flags); |
681b84e1 CL |
521 | if (!runtime->dma_area) |
522 | return -ENOMEM; | |
523 | runtime->dma_bytes = size; | |
524 | return 1; | |
525 | } | |
526 | EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer); | |
527 | ||
528 | /** | |
529 | * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer | |
530 | * @substream: the substream with a buffer allocated by | |
531 | * snd_pcm_lib_alloc_vmalloc_buffer() | |
eb7c06e8 YB |
532 | * |
533 | * Return: Zero if successful, or a negative error code on failure. | |
681b84e1 CL |
534 | */ |
535 | int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream) | |
536 | { | |
537 | struct snd_pcm_runtime *runtime; | |
538 | ||
539 | if (PCM_RUNTIME_CHECK(substream)) | |
540 | return -EINVAL; | |
541 | runtime = substream->runtime; | |
542 | vfree(runtime->dma_area); | |
543 | runtime->dma_area = NULL; | |
544 | return 0; | |
545 | } | |
546 | EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer); | |
547 | ||
548 | /** | |
549 | * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct | |
550 | * @substream: the substream with a buffer allocated by | |
551 | * snd_pcm_lib_alloc_vmalloc_buffer() | |
552 | * @offset: offset in the buffer | |
553 | * | |
554 | * This function is to be used as the page callback in the PCM ops. | |
eb7c06e8 YB |
555 | * |
556 | * Return: The page struct, or %NULL on failure. | |
681b84e1 CL |
557 | */ |
558 | struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, | |
559 | unsigned long offset) | |
560 | { | |
561 | return vmalloc_to_page(substream->runtime->dma_area + offset); | |
562 | } | |
563 | EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page); |