Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Digital Audio (PCM) abstract layer |
Jaroslav Kysela | c1017a4 | 2007-10-15 09:50:19 +0200 | [diff] [blame] | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/io.h> |
| 23 | #include <linux/time.h> |
| 24 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 25 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/moduleparam.h> |
Takashi Iwai | ee7c343 | 2009-12-21 12:41:37 +0100 | [diff] [blame] | 27 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 50 | static int preallocate_pcm_pages(struct snd_pcm_substream *substream, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
| 52 | struct snd_dma_buffer *dmab = &substream->dma_buffer; |
| 53 | int err; |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 80 | static void snd_pcm_lib_preallocate_dma_free(struct snd_pcm_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 99 | int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
| 101 | snd_pcm_lib_preallocate_dma_free(substream); |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 102 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
Jaroslav Kysela | c7132ae | 2006-10-06 15:12:29 +0200 | [diff] [blame] | 103 | snd_info_free_entry(substream->proc_prealloc_max_entry); |
| 104 | substream->proc_prealloc_max_entry = NULL; |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 105 | snd_info_free_entry(substream->proc_prealloc_entry); |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 106 | substream->proc_prealloc_entry = NULL; |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 107 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 119 | int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 121 | struct snd_pcm_substream *substream; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 130 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); |
| 131 | |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 132 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
| 134 | * read callback for prealloc proc file |
| 135 | * |
| 136 | * prints the current allocated size in kB. |
| 137 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 138 | static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry, |
| 139 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 141 | struct snd_pcm_substream *substream = entry->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024); |
| 143 | } |
| 144 | |
| 145 | /* |
Jaroslav Kysela | c7132ae | 2006-10-06 15:12:29 +0200 | [diff] [blame] | 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 | |
| 157 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | * write callback for prealloc proc file |
| 159 | * |
| 160 | * accepts the preallocation size in kB. |
| 161 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 162 | static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, |
| 163 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 165 | struct snd_pcm_substream *substream = entry->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 204 | static inline void preallocate_info_init(struct snd_pcm_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 206 | struct snd_info_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc", substream->proc_root)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | entry->c.text.read = snd_pcm_lib_preallocate_proc_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | entry->c.text.write = snd_pcm_lib_preallocate_proc_write; |
Takashi Iwai | bd7bf04 | 2005-04-12 16:27:28 +0200 | [diff] [blame] | 211 | entry->mode |= S_IWUSR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Jaroslav Kysela | c7132ae | 2006-10-06 15:12:29 +0200 | [diff] [blame] | 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; |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 228 | } |
| 229 | |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 230 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 231 | #define preallocate_info_init(s) |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 232 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 269 | int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 278 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); |
| 279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | /** |
| 281 | * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continous memory type (all substreams) |
Takashi Iwai | df8db93 | 2005-09-07 13:38:19 +0200 | [diff] [blame] | 282 | * @pcm: the pcm instance |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 293 | int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | int type, void *data, |
| 295 | size_t size, size_t max) |
| 296 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 297 | struct snd_pcm_substream *substream; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 307 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); |
| 308 | |
Takashi Iwai | cc6a8ac | 2008-06-17 16:39:06 +0200 | [diff] [blame] | 309 | #ifdef CONFIG_SND_DMA_SGBUF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 318 | struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 328 | EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); |
| 329 | |
Takashi Iwai | 51e9f2e | 2008-07-30 15:13:33 +0200 | [diff] [blame] | 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); |
Takashi Iwai | cc6a8ac | 2008-06-17 16:39:06 +0200 | [diff] [blame] | 355 | #endif /* CONFIG_SND_DMA_SGBUF */ |
Takashi Iwai | 51e9f2e | 2008-07-30 15:13:33 +0200 | [diff] [blame] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 368 | int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 370 | struct snd_pcm_runtime *runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | struct snd_dma_buffer *dmab = NULL; |
| 372 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 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; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | runtime = substream->runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 390 | if (substream->dma_buffer.area != NULL && |
| 391 | substream->dma_buffer.bytes >= size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | dmab = &substream->dma_buffer; /* use the pre-allocated buffer */ |
| 393 | } else { |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 394 | dmab = kzalloc(sizeof(*dmab), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 410 | EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); |
| 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 420 | int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 422 | struct snd_pcm_runtime *runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 424 | if (PCM_RUNTIME_CHECK(substream)) |
| 425 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | runtime = substream->runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 437 | |
| 438 | EXPORT_SYMBOL(snd_pcm_lib_free_pages); |
Clemens Ladisch | 681b84e | 2009-12-18 09:29:00 +0100 | [diff] [blame] | 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); |