Commit | Line | Data |
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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> | |
18 | ||
19 | static int preallocate_dma = 1; | |
20 | module_param(preallocate_dma, int, 0444); | |
21 | MODULE_PARM_DESC(preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized."); | |
22 | ||
23 | static int maximum_substreams = 4; | |
24 | module_param(maximum_substreams, int, 0444); | |
25 | MODULE_PARM_DESC(maximum_substreams, "Maximum substreams with preallocated DMA memory."); | |
26 | ||
27 | static const size_t snd_minimum_buffer = 16384; | |
28 | ||
29 | ||
30 | /* | |
31 | * try to allocate as the large pages as possible. | |
32 | * stores the resultant memory size in *res_size. | |
33 | * | |
34 | * the minimum size is snd_minimum_buffer. it should be power of 2. | |
35 | */ | |
877211f5 | 36 | static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size) |
1da177e4 LT |
37 | { |
38 | struct snd_dma_buffer *dmab = &substream->dma_buffer; | |
6ab08ced | 39 | size_t orig_size = size; |
1da177e4 LT |
40 | int err; |
41 | ||
1da177e4 LT |
42 | do { |
43 | if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, | |
44 | size, dmab)) < 0) { | |
45 | if (err != -ENOMEM) | |
46 | return err; /* fatal error */ | |
47 | } else | |
48 | return 0; | |
49 | size >>= 1; | |
50 | } while (size >= snd_minimum_buffer); | |
51 | dmab->bytes = 0; /* tell error */ | |
6ab08ced TI |
52 | pr_warn("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", |
53 | substream->pcm->card->number, substream->pcm->device, | |
54 | substream->stream ? 'c' : 'p', substream->number, | |
55 | substream->pcm->name, orig_size); | |
1da177e4 LT |
56 | return 0; |
57 | } | |
58 | ||
59 | /* | |
60 | * release the preallocated buffer if not yet done. | |
61 | */ | |
877211f5 | 62 | static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream) |
1da177e4 LT |
63 | { |
64 | if (substream->dma_buffer.area == NULL) | |
65 | return; | |
47d98c02 | 66 | snd_dma_free_pages(&substream->dma_buffer); |
1da177e4 LT |
67 | substream->dma_buffer.area = NULL; |
68 | } | |
69 | ||
70 | /** | |
71 | * snd_pcm_lib_preallocate_free - release the preallocated buffer of the specified substream. | |
72 | * @substream: the pcm substream instance | |
73 | * | |
74 | * Releases the pre-allocated buffer of the given substream. | |
1da177e4 | 75 | */ |
bb580602 | 76 | void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) |
1da177e4 LT |
77 | { |
78 | snd_pcm_lib_preallocate_dma_free(substream); | |
1da177e4 LT |
79 | } |
80 | ||
81 | /** | |
82 | * snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm | |
83 | * @pcm: the pcm instance | |
84 | * | |
85 | * Releases all the pre-allocated buffers on the given pcm. | |
1da177e4 | 86 | */ |
bb580602 | 87 | void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm) |
1da177e4 | 88 | { |
877211f5 | 89 | struct snd_pcm_substream *substream; |
1da177e4 LT |
90 | int stream; |
91 | ||
92 | for (stream = 0; stream < 2; stream++) | |
93 | for (substream = pcm->streams[stream].substream; substream; substream = substream->next) | |
94 | snd_pcm_lib_preallocate_free(substream); | |
1da177e4 | 95 | } |
e88e8ae6 TI |
96 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); |
97 | ||
b7d90a35 | 98 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
1da177e4 LT |
99 | /* |
100 | * read callback for prealloc proc file | |
101 | * | |
102 | * prints the current allocated size in kB. | |
103 | */ | |
877211f5 TI |
104 | static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry, |
105 | struct snd_info_buffer *buffer) | |
1da177e4 | 106 | { |
877211f5 | 107 | struct snd_pcm_substream *substream = entry->private_data; |
1da177e4 LT |
108 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024); |
109 | } | |
110 | ||
c7132aeb JK |
111 | /* |
112 | * read callback for prealloc_max proc file | |
113 | * | |
114 | * prints the maximum allowed size in kB. | |
115 | */ | |
116 | static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry, | |
117 | struct snd_info_buffer *buffer) | |
118 | { | |
119 | struct snd_pcm_substream *substream = entry->private_data; | |
120 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024); | |
121 | } | |
122 | ||
1da177e4 LT |
123 | /* |
124 | * write callback for prealloc proc file | |
125 | * | |
126 | * accepts the preallocation size in kB. | |
127 | */ | |
877211f5 TI |
128 | static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, |
129 | struct snd_info_buffer *buffer) | |
1da177e4 | 130 | { |
877211f5 | 131 | struct snd_pcm_substream *substream = entry->private_data; |
1da177e4 LT |
132 | char line[64], str[64]; |
133 | size_t size; | |
134 | struct snd_dma_buffer new_dmab; | |
135 | ||
136 | if (substream->runtime) { | |
137 | buffer->error = -EBUSY; | |
138 | return; | |
139 | } | |
140 | if (!snd_info_get_line(buffer, line, sizeof(line))) { | |
141 | snd_info_get_str(str, line, sizeof(str)); | |
142 | size = simple_strtoul(str, NULL, 10) * 1024; | |
143 | if ((size != 0 && size < 8192) || size > substream->dma_max) { | |
144 | buffer->error = -EINVAL; | |
145 | return; | |
146 | } | |
147 | if (substream->dma_buffer.bytes == size) | |
148 | return; | |
149 | memset(&new_dmab, 0, sizeof(new_dmab)); | |
150 | new_dmab.dev = substream->dma_buffer.dev; | |
151 | if (size > 0) { | |
152 | if (snd_dma_alloc_pages(substream->dma_buffer.dev.type, | |
153 | substream->dma_buffer.dev.dev, | |
154 | size, &new_dmab) < 0) { | |
155 | buffer->error = -ENOMEM; | |
156 | return; | |
157 | } | |
158 | substream->buffer_bytes_max = size; | |
159 | } else { | |
160 | substream->buffer_bytes_max = UINT_MAX; | |
161 | } | |
162 | if (substream->dma_buffer.area) | |
163 | snd_dma_free_pages(&substream->dma_buffer); | |
164 | substream->dma_buffer = new_dmab; | |
165 | } else { | |
166 | buffer->error = -EINVAL; | |
167 | } | |
168 | } | |
169 | ||
e28563cc | 170 | static inline void preallocate_info_init(struct snd_pcm_substream *substream) |
1da177e4 | 171 | { |
877211f5 | 172 | struct snd_info_entry *entry; |
1da177e4 | 173 | |
a8d14981 TI |
174 | entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", |
175 | substream->proc_root); | |
176 | if (entry) { | |
177 | snd_info_set_text_ops(entry, substream, | |
178 | snd_pcm_lib_preallocate_proc_read); | |
1da177e4 | 179 | entry->c.text.write = snd_pcm_lib_preallocate_proc_write; |
6a73cf46 | 180 | entry->mode |= 0200; |
c7132aeb | 181 | } |
a8d14981 TI |
182 | entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", |
183 | substream->proc_root); | |
184 | if (entry) | |
185 | snd_info_set_text_ops(entry, substream, | |
186 | snd_pcm_lib_preallocate_max_proc_read); | |
e28563cc TI |
187 | } |
188 | ||
b7d90a35 | 189 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
e28563cc | 190 | #define preallocate_info_init(s) |
b7d90a35 | 191 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
e28563cc TI |
192 | |
193 | /* | |
194 | * pre-allocate the buffer and create a proc file for the substream | |
195 | */ | |
bb580602 | 196 | static void snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream, |
e28563cc TI |
197 | size_t size, size_t max) |
198 | { | |
199 | ||
200 | if (size > 0 && preallocate_dma && substream->number < maximum_substreams) | |
201 | preallocate_pcm_pages(substream, size); | |
202 | ||
203 | if (substream->dma_buffer.bytes > 0) | |
204 | substream->buffer_bytes_max = substream->dma_buffer.bytes; | |
205 | substream->dma_max = max; | |
206 | preallocate_info_init(substream); | |
1da177e4 LT |
207 | } |
208 | ||
209 | ||
210 | /** | |
211 | * snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type | |
212 | * @substream: the pcm substream instance | |
213 | * @type: DMA type (SNDRV_DMA_TYPE_*) | |
25985edc | 214 | * @data: DMA type dependent data |
1da177e4 LT |
215 | * @size: the requested pre-allocation size in bytes |
216 | * @max: the max. allowed pre-allocation size | |
217 | * | |
218 | * Do pre-allocation for the given DMA buffer type. | |
1da177e4 | 219 | */ |
bb580602 | 220 | void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, |
1da177e4 LT |
221 | int type, struct device *data, |
222 | size_t size, size_t max) | |
223 | { | |
224 | substream->dma_buffer.dev.type = type; | |
225 | substream->dma_buffer.dev.dev = data; | |
bb580602 | 226 | snd_pcm_lib_preallocate_pages1(substream, size, max); |
1da177e4 | 227 | } |
e88e8ae6 TI |
228 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); |
229 | ||
1da177e4 | 230 | /** |
25985edc | 231 | * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continuous memory type (all substreams) |
df8db936 | 232 | * @pcm: the pcm instance |
1da177e4 | 233 | * @type: DMA type (SNDRV_DMA_TYPE_*) |
25985edc | 234 | * @data: DMA type dependent data |
1da177e4 LT |
235 | * @size: the requested pre-allocation size in bytes |
236 | * @max: the max. allowed pre-allocation size | |
237 | * | |
238 | * Do pre-allocation to all substreams of the given pcm for the | |
239 | * specified DMA type. | |
1da177e4 | 240 | */ |
bb580602 | 241 | void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, |
1da177e4 LT |
242 | int type, void *data, |
243 | size_t size, size_t max) | |
244 | { | |
877211f5 | 245 | struct snd_pcm_substream *substream; |
bb580602 | 246 | int stream; |
1da177e4 LT |
247 | |
248 | for (stream = 0; stream < 2; stream++) | |
249 | for (substream = pcm->streams[stream].substream; substream; substream = substream->next) | |
bb580602 | 250 | snd_pcm_lib_preallocate_pages(substream, type, data, size, max); |
1da177e4 | 251 | } |
e88e8ae6 TI |
252 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); |
253 | ||
cc6a8acd | 254 | #ifdef CONFIG_SND_DMA_SGBUF |
1da177e4 LT |
255 | /** |
256 | * snd_pcm_sgbuf_ops_page - get the page struct at the given offset | |
257 | * @substream: the pcm substream instance | |
258 | * @offset: the buffer offset | |
259 | * | |
1da177e4 | 260 | * Used as the page callback of PCM ops. |
eb7c06e8 YB |
261 | * |
262 | * Return: The page struct at the given buffer offset. %NULL on failure. | |
1da177e4 | 263 | */ |
877211f5 | 264 | struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset) |
1da177e4 LT |
265 | { |
266 | struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream); | |
267 | ||
268 | unsigned int idx = offset >> PAGE_SHIFT; | |
269 | if (idx >= (unsigned int)sgbuf->pages) | |
270 | return NULL; | |
271 | return sgbuf->page_table[idx]; | |
272 | } | |
e88e8ae6 | 273 | EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); |
cc6a8acd | 274 | #endif /* CONFIG_SND_DMA_SGBUF */ |
51e9f2e6 | 275 | |
1da177e4 LT |
276 | /** |
277 | * snd_pcm_lib_malloc_pages - allocate the DMA buffer | |
278 | * @substream: the substream to allocate the DMA buffer to | |
279 | * @size: the requested buffer size in bytes | |
280 | * | |
281 | * Allocates the DMA buffer on the BUS type given earlier to | |
282 | * snd_pcm_lib_preallocate_xxx_pages(). | |
283 | * | |
eb7c06e8 | 284 | * Return: 1 if the buffer is changed, 0 if not changed, or a negative |
1da177e4 LT |
285 | * code on failure. |
286 | */ | |
877211f5 | 287 | int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) |
1da177e4 | 288 | { |
877211f5 | 289 | struct snd_pcm_runtime *runtime; |
1da177e4 LT |
290 | struct snd_dma_buffer *dmab = NULL; |
291 | ||
7eaa943c TI |
292 | if (PCM_RUNTIME_CHECK(substream)) |
293 | return -EINVAL; | |
294 | if (snd_BUG_ON(substream->dma_buffer.dev.type == | |
295 | SNDRV_DMA_TYPE_UNKNOWN)) | |
296 | return -EINVAL; | |
1da177e4 | 297 | runtime = substream->runtime; |
1da177e4 LT |
298 | |
299 | if (runtime->dma_buffer_p) { | |
300 | /* perphaps, we might free the large DMA memory region | |
301 | to save some space here, but the actual solution | |
302 | costs us less time */ | |
303 | if (runtime->dma_buffer_p->bytes >= size) { | |
304 | runtime->dma_bytes = size; | |
305 | return 0; /* ok, do not change */ | |
306 | } | |
307 | snd_pcm_lib_free_pages(substream); | |
308 | } | |
877211f5 TI |
309 | if (substream->dma_buffer.area != NULL && |
310 | substream->dma_buffer.bytes >= size) { | |
1da177e4 LT |
311 | dmab = &substream->dma_buffer; /* use the pre-allocated buffer */ |
312 | } else { | |
ca2c0966 | 313 | dmab = kzalloc(sizeof(*dmab), GFP_KERNEL); |
1da177e4 LT |
314 | if (! dmab) |
315 | return -ENOMEM; | |
316 | dmab->dev = substream->dma_buffer.dev; | |
317 | if (snd_dma_alloc_pages(substream->dma_buffer.dev.type, | |
318 | substream->dma_buffer.dev.dev, | |
319 | size, dmab) < 0) { | |
320 | kfree(dmab); | |
321 | return -ENOMEM; | |
322 | } | |
323 | } | |
324 | snd_pcm_set_runtime_buffer(substream, dmab); | |
325 | runtime->dma_bytes = size; | |
326 | return 1; /* area was changed */ | |
327 | } | |
e88e8ae6 TI |
328 | EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); |
329 | ||
1da177e4 LT |
330 | /** |
331 | * snd_pcm_lib_free_pages - release the allocated DMA buffer. | |
332 | * @substream: the substream to release the DMA buffer | |
333 | * | |
334 | * Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages(). | |
335 | * | |
eb7c06e8 | 336 | * Return: Zero if successful, or a negative error code on failure. |
1da177e4 | 337 | */ |
877211f5 | 338 | int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) |
1da177e4 | 339 | { |
877211f5 | 340 | struct snd_pcm_runtime *runtime; |
1da177e4 | 341 | |
7eaa943c TI |
342 | if (PCM_RUNTIME_CHECK(substream)) |
343 | return -EINVAL; | |
1da177e4 | 344 | runtime = substream->runtime; |
1da177e4 LT |
345 | if (runtime->dma_area == NULL) |
346 | return 0; | |
347 | if (runtime->dma_buffer_p != &substream->dma_buffer) { | |
348 | /* it's a newly allocated buffer. release it now. */ | |
349 | snd_dma_free_pages(runtime->dma_buffer_p); | |
350 | kfree(runtime->dma_buffer_p); | |
351 | } | |
352 | snd_pcm_set_runtime_buffer(substream, NULL); | |
353 | return 0; | |
354 | } | |
e88e8ae6 | 355 | EXPORT_SYMBOL(snd_pcm_lib_free_pages); |
681b84e1 CL |
356 | |
357 | int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, | |
358 | size_t size, gfp_t gfp_flags) | |
359 | { | |
360 | struct snd_pcm_runtime *runtime; | |
361 | ||
362 | if (PCM_RUNTIME_CHECK(substream)) | |
363 | return -EINVAL; | |
364 | runtime = substream->runtime; | |
365 | if (runtime->dma_area) { | |
366 | if (runtime->dma_bytes >= size) | |
367 | return 0; /* already large enough */ | |
368 | vfree(runtime->dma_area); | |
369 | } | |
370 | runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL); | |
371 | if (!runtime->dma_area) | |
372 | return -ENOMEM; | |
373 | runtime->dma_bytes = size; | |
374 | return 1; | |
375 | } | |
376 | EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer); | |
377 | ||
378 | /** | |
379 | * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer | |
380 | * @substream: the substream with a buffer allocated by | |
381 | * snd_pcm_lib_alloc_vmalloc_buffer() | |
eb7c06e8 YB |
382 | * |
383 | * Return: Zero if successful, or a negative error code on failure. | |
681b84e1 CL |
384 | */ |
385 | int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream) | |
386 | { | |
387 | struct snd_pcm_runtime *runtime; | |
388 | ||
389 | if (PCM_RUNTIME_CHECK(substream)) | |
390 | return -EINVAL; | |
391 | runtime = substream->runtime; | |
392 | vfree(runtime->dma_area); | |
393 | runtime->dma_area = NULL; | |
394 | return 0; | |
395 | } | |
396 | EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer); | |
397 | ||
398 | /** | |
399 | * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct | |
400 | * @substream: the substream with a buffer allocated by | |
401 | * snd_pcm_lib_alloc_vmalloc_buffer() | |
402 | * @offset: offset in the buffer | |
403 | * | |
404 | * This function is to be used as the page callback in the PCM ops. | |
eb7c06e8 YB |
405 | * |
406 | * Return: The page struct, or %NULL on failure. | |
681b84e1 CL |
407 | */ |
408 | struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, | |
409 | unsigned long offset) | |
410 | { | |
411 | return vmalloc_to_page(substream->runtime->dma_area + offset); | |
412 | } | |
413 | EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page); |