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 | |
Takashi Iwai | 6cbbfe1 | 2015-01-28 16:49:33 +0100 | [diff] [blame] | 22 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Paul Gortmaker | d81a6d7 | 2011-09-22 09:34:58 -0400 | [diff] [blame] | 28 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <sound/core.h> |
| 30 | #include <sound/pcm.h> |
| 31 | #include <sound/info.h> |
| 32 | #include <sound/initval.h> |
| 33 | |
| 34 | static int preallocate_dma = 1; |
| 35 | module_param(preallocate_dma, int, 0444); |
| 36 | MODULE_PARM_DESC(preallocate_dma, "Preallocate DMA memory when the PCM devices are initialized."); |
| 37 | |
| 38 | static int maximum_substreams = 4; |
| 39 | module_param(maximum_substreams, int, 0444); |
| 40 | MODULE_PARM_DESC(maximum_substreams, "Maximum substreams with preallocated DMA memory."); |
| 41 | |
| 42 | static const size_t snd_minimum_buffer = 16384; |
| 43 | |
| 44 | |
| 45 | /* |
| 46 | * try to allocate as the large pages as possible. |
| 47 | * stores the resultant memory size in *res_size. |
| 48 | * |
| 49 | * the minimum size is snd_minimum_buffer. it should be power of 2. |
| 50 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 51 | 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] | 52 | { |
| 53 | struct snd_dma_buffer *dmab = &substream->dma_buffer; |
Takashi Iwai | 6ab08ce | 2014-01-10 13:01:41 +0100 | [diff] [blame] | 54 | size_t orig_size = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | int err; |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | do { |
| 58 | if ((err = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, |
| 59 | size, dmab)) < 0) { |
| 60 | if (err != -ENOMEM) |
| 61 | return err; /* fatal error */ |
| 62 | } else |
| 63 | return 0; |
| 64 | size >>= 1; |
| 65 | } while (size >= snd_minimum_buffer); |
| 66 | dmab->bytes = 0; /* tell error */ |
Takashi Iwai | 6ab08ce | 2014-01-10 13:01:41 +0100 | [diff] [blame] | 67 | pr_warn("ALSA pcmC%dD%d%c,%d:%s: cannot preallocate for size %zu\n", |
| 68 | substream->pcm->card->number, substream->pcm->device, |
| 69 | substream->stream ? 'c' : 'p', substream->number, |
| 70 | substream->pcm->name, orig_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * release the preallocated buffer if not yet done. |
| 76 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 77 | 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] | 78 | { |
| 79 | if (substream->dma_buffer.area == NULL) |
| 80 | return; |
Takashi Iwai | 47d98c0 | 2014-01-08 16:12:25 +0100 | [diff] [blame] | 81 | snd_dma_free_pages(&substream->dma_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | substream->dma_buffer.area = NULL; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * snd_pcm_lib_preallocate_free - release the preallocated buffer of the specified substream. |
| 87 | * @substream: the pcm substream instance |
| 88 | * |
| 89 | * Releases the pre-allocated buffer of the given substream. |
| 90 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 91 | * Return: Zero if successful, or a negative error code on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 93 | int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
| 95 | snd_pcm_lib_preallocate_dma_free(substream); |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 96 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
Jaroslav Kysela | c7132ae | 2006-10-06 15:12:29 +0200 | [diff] [blame] | 97 | snd_info_free_entry(substream->proc_prealloc_max_entry); |
| 98 | substream->proc_prealloc_max_entry = NULL; |
Takashi Iwai | 746d4a0 | 2006-06-23 14:37:59 +0200 | [diff] [blame] | 99 | snd_info_free_entry(substream->proc_prealloc_entry); |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 100 | substream->proc_prealloc_entry = NULL; |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * snd_pcm_lib_preallocate_free_for_all - release all pre-allocated buffers on the pcm |
| 107 | * @pcm: the pcm instance |
| 108 | * |
| 109 | * Releases all the pre-allocated buffers on the given pcm. |
| 110 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 111 | * Return: Zero if successful, or a negative error code on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 113 | int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 115 | struct snd_pcm_substream *substream; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | int stream; |
| 117 | |
| 118 | for (stream = 0; stream < 2; stream++) |
| 119 | for (substream = pcm->streams[stream].substream; substream; substream = substream->next) |
| 120 | snd_pcm_lib_preallocate_free(substream); |
| 121 | return 0; |
| 122 | } |
| 123 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 124 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); |
| 125 | |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 126 | #ifdef CONFIG_SND_VERBOSE_PROCFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | /* |
| 128 | * read callback for prealloc proc file |
| 129 | * |
| 130 | * prints the current allocated size in kB. |
| 131 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 132 | static void snd_pcm_lib_preallocate_proc_read(struct snd_info_entry *entry, |
| 133 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 135 | struct snd_pcm_substream *substream = entry->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_buffer.bytes / 1024); |
| 137 | } |
| 138 | |
| 139 | /* |
Jaroslav Kysela | c7132ae | 2006-10-06 15:12:29 +0200 | [diff] [blame] | 140 | * read callback for prealloc_max proc file |
| 141 | * |
| 142 | * prints the maximum allowed size in kB. |
| 143 | */ |
| 144 | static void snd_pcm_lib_preallocate_max_proc_read(struct snd_info_entry *entry, |
| 145 | struct snd_info_buffer *buffer) |
| 146 | { |
| 147 | struct snd_pcm_substream *substream = entry->private_data; |
| 148 | snd_iprintf(buffer, "%lu\n", (unsigned long) substream->dma_max / 1024); |
| 149 | } |
| 150 | |
| 151 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | * write callback for prealloc proc file |
| 153 | * |
| 154 | * accepts the preallocation size in kB. |
| 155 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 156 | static void snd_pcm_lib_preallocate_proc_write(struct snd_info_entry *entry, |
| 157 | struct snd_info_buffer *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 159 | struct snd_pcm_substream *substream = entry->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | char line[64], str[64]; |
| 161 | size_t size; |
| 162 | struct snd_dma_buffer new_dmab; |
| 163 | |
| 164 | if (substream->runtime) { |
| 165 | buffer->error = -EBUSY; |
| 166 | return; |
| 167 | } |
| 168 | if (!snd_info_get_line(buffer, line, sizeof(line))) { |
| 169 | snd_info_get_str(str, line, sizeof(str)); |
| 170 | size = simple_strtoul(str, NULL, 10) * 1024; |
| 171 | if ((size != 0 && size < 8192) || size > substream->dma_max) { |
| 172 | buffer->error = -EINVAL; |
| 173 | return; |
| 174 | } |
| 175 | if (substream->dma_buffer.bytes == size) |
| 176 | return; |
| 177 | memset(&new_dmab, 0, sizeof(new_dmab)); |
| 178 | new_dmab.dev = substream->dma_buffer.dev; |
| 179 | if (size > 0) { |
| 180 | if (snd_dma_alloc_pages(substream->dma_buffer.dev.type, |
| 181 | substream->dma_buffer.dev.dev, |
| 182 | size, &new_dmab) < 0) { |
| 183 | buffer->error = -ENOMEM; |
| 184 | return; |
| 185 | } |
| 186 | substream->buffer_bytes_max = size; |
| 187 | } else { |
| 188 | substream->buffer_bytes_max = UINT_MAX; |
| 189 | } |
| 190 | if (substream->dma_buffer.area) |
| 191 | snd_dma_free_pages(&substream->dma_buffer); |
| 192 | substream->dma_buffer = new_dmab; |
| 193 | } else { |
| 194 | buffer->error = -EINVAL; |
| 195 | } |
| 196 | } |
| 197 | |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 198 | static inline void preallocate_info_init(struct snd_pcm_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 200 | struct snd_info_entry *entry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | 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] | 203 | entry->c.text.read = snd_pcm_lib_preallocate_proc_read; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | entry->c.text.write = snd_pcm_lib_preallocate_proc_write; |
Takashi Iwai | bd7bf04 | 2005-04-12 16:27:28 +0200 | [diff] [blame] | 205 | entry->mode |= S_IWUSR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | entry->private_data = substream; |
| 207 | if (snd_info_register(entry) < 0) { |
| 208 | snd_info_free_entry(entry); |
| 209 | entry = NULL; |
| 210 | } |
| 211 | } |
| 212 | substream->proc_prealloc_entry = entry; |
Jaroslav Kysela | c7132ae | 2006-10-06 15:12:29 +0200 | [diff] [blame] | 213 | if ((entry = snd_info_create_card_entry(substream->pcm->card, "prealloc_max", substream->proc_root)) != NULL) { |
| 214 | entry->c.text.read = snd_pcm_lib_preallocate_max_proc_read; |
| 215 | entry->private_data = substream; |
| 216 | if (snd_info_register(entry) < 0) { |
| 217 | snd_info_free_entry(entry); |
| 218 | entry = NULL; |
| 219 | } |
| 220 | } |
| 221 | substream->proc_prealloc_max_entry = entry; |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 222 | } |
| 223 | |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 224 | #else /* !CONFIG_SND_VERBOSE_PROCFS */ |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 225 | #define preallocate_info_init(s) |
Takashi Iwai | b7d90a3 | 2006-04-25 12:56:04 +0200 | [diff] [blame] | 226 | #endif /* CONFIG_SND_VERBOSE_PROCFS */ |
Takashi Iwai | e28563c | 2005-12-01 10:42:42 +0100 | [diff] [blame] | 227 | |
| 228 | /* |
| 229 | * pre-allocate the buffer and create a proc file for the substream |
| 230 | */ |
| 231 | static int snd_pcm_lib_preallocate_pages1(struct snd_pcm_substream *substream, |
| 232 | size_t size, size_t max) |
| 233 | { |
| 234 | |
| 235 | if (size > 0 && preallocate_dma && substream->number < maximum_substreams) |
| 236 | preallocate_pcm_pages(substream, size); |
| 237 | |
| 238 | if (substream->dma_buffer.bytes > 0) |
| 239 | substream->buffer_bytes_max = substream->dma_buffer.bytes; |
| 240 | substream->dma_max = max; |
| 241 | preallocate_info_init(substream); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | |
| 246 | /** |
| 247 | * snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type |
| 248 | * @substream: the pcm substream instance |
| 249 | * @type: DMA type (SNDRV_DMA_TYPE_*) |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 250 | * @data: DMA type dependent data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | * @size: the requested pre-allocation size in bytes |
| 252 | * @max: the max. allowed pre-allocation size |
| 253 | * |
| 254 | * Do pre-allocation for the given DMA buffer type. |
| 255 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 256 | * Return: Zero if successful, or a negative error code on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 258 | int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | int type, struct device *data, |
| 260 | size_t size, size_t max) |
| 261 | { |
| 262 | substream->dma_buffer.dev.type = type; |
| 263 | substream->dma_buffer.dev.dev = data; |
| 264 | return snd_pcm_lib_preallocate_pages1(substream, size, max); |
| 265 | } |
| 266 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 267 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | /** |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 270 | * snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continuous memory type (all substreams) |
Takashi Iwai | df8db93 | 2005-09-07 13:38:19 +0200 | [diff] [blame] | 271 | * @pcm: the pcm instance |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | * @type: DMA type (SNDRV_DMA_TYPE_*) |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 273 | * @data: DMA type dependent data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | * @size: the requested pre-allocation size in bytes |
| 275 | * @max: the max. allowed pre-allocation size |
| 276 | * |
| 277 | * Do pre-allocation to all substreams of the given pcm for the |
| 278 | * specified DMA type. |
| 279 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 280 | * Return: Zero if successful, or a negative error code on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 282 | int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | int type, void *data, |
| 284 | size_t size, size_t max) |
| 285 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 286 | struct snd_pcm_substream *substream; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | int stream, err; |
| 288 | |
| 289 | for (stream = 0; stream < 2; stream++) |
| 290 | for (substream = pcm->streams[stream].substream; substream; substream = substream->next) |
| 291 | if ((err = snd_pcm_lib_preallocate_pages(substream, type, data, size, max)) < 0) |
| 292 | return err; |
| 293 | return 0; |
| 294 | } |
| 295 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 296 | EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); |
| 297 | |
Takashi Iwai | cc6a8ac | 2008-06-17 16:39:06 +0200 | [diff] [blame] | 298 | #ifdef CONFIG_SND_DMA_SGBUF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | /** |
| 300 | * snd_pcm_sgbuf_ops_page - get the page struct at the given offset |
| 301 | * @substream: the pcm substream instance |
| 302 | * @offset: the buffer offset |
| 303 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | * Used as the page callback of PCM ops. |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 305 | * |
| 306 | * Return: The page struct at the given buffer offset. %NULL on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 308 | 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] | 309 | { |
| 310 | struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream); |
| 311 | |
| 312 | unsigned int idx = offset >> PAGE_SHIFT; |
| 313 | if (idx >= (unsigned int)sgbuf->pages) |
| 314 | return NULL; |
| 315 | return sgbuf->page_table[idx]; |
| 316 | } |
| 317 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 318 | EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); |
Takashi Iwai | cc6a8ac | 2008-06-17 16:39:06 +0200 | [diff] [blame] | 319 | #endif /* CONFIG_SND_DMA_SGBUF */ |
Takashi Iwai | 51e9f2e | 2008-07-30 15:13:33 +0200 | [diff] [blame] | 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | /** |
| 322 | * snd_pcm_lib_malloc_pages - allocate the DMA buffer |
| 323 | * @substream: the substream to allocate the DMA buffer to |
| 324 | * @size: the requested buffer size in bytes |
| 325 | * |
| 326 | * Allocates the DMA buffer on the BUS type given earlier to |
| 327 | * snd_pcm_lib_preallocate_xxx_pages(). |
| 328 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 329 | * Return: 1 if the buffer is changed, 0 if not changed, or a negative |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | * code on failure. |
| 331 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 332 | 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] | 333 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 334 | struct snd_pcm_runtime *runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | struct snd_dma_buffer *dmab = NULL; |
| 336 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 337 | if (PCM_RUNTIME_CHECK(substream)) |
| 338 | return -EINVAL; |
| 339 | if (snd_BUG_ON(substream->dma_buffer.dev.type == |
| 340 | SNDRV_DMA_TYPE_UNKNOWN)) |
| 341 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | runtime = substream->runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | if (runtime->dma_buffer_p) { |
| 345 | /* perphaps, we might free the large DMA memory region |
| 346 | to save some space here, but the actual solution |
| 347 | costs us less time */ |
| 348 | if (runtime->dma_buffer_p->bytes >= size) { |
| 349 | runtime->dma_bytes = size; |
| 350 | return 0; /* ok, do not change */ |
| 351 | } |
| 352 | snd_pcm_lib_free_pages(substream); |
| 353 | } |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 354 | if (substream->dma_buffer.area != NULL && |
| 355 | substream->dma_buffer.bytes >= size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | dmab = &substream->dma_buffer; /* use the pre-allocated buffer */ |
| 357 | } else { |
Takashi Iwai | ca2c096 | 2005-09-09 14:20:23 +0200 | [diff] [blame] | 358 | dmab = kzalloc(sizeof(*dmab), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (! dmab) |
| 360 | return -ENOMEM; |
| 361 | dmab->dev = substream->dma_buffer.dev; |
| 362 | if (snd_dma_alloc_pages(substream->dma_buffer.dev.type, |
| 363 | substream->dma_buffer.dev.dev, |
| 364 | size, dmab) < 0) { |
| 365 | kfree(dmab); |
| 366 | return -ENOMEM; |
| 367 | } |
| 368 | } |
| 369 | snd_pcm_set_runtime_buffer(substream, dmab); |
| 370 | runtime->dma_bytes = size; |
| 371 | return 1; /* area was changed */ |
| 372 | } |
| 373 | |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 374 | EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); |
| 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | /** |
| 377 | * snd_pcm_lib_free_pages - release the allocated DMA buffer. |
| 378 | * @substream: the substream to release the DMA buffer |
| 379 | * |
| 380 | * Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages(). |
| 381 | * |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 382 | * Return: Zero if successful, or a negative error code on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | */ |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 384 | int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | { |
Takashi Iwai | 877211f | 2005-11-17 13:59:38 +0100 | [diff] [blame] | 386 | struct snd_pcm_runtime *runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
Takashi Iwai | 7eaa943 | 2008-08-08 17:09:09 +0200 | [diff] [blame] | 388 | if (PCM_RUNTIME_CHECK(substream)) |
| 389 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | runtime = substream->runtime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | if (runtime->dma_area == NULL) |
| 392 | return 0; |
| 393 | if (runtime->dma_buffer_p != &substream->dma_buffer) { |
| 394 | /* it's a newly allocated buffer. release it now. */ |
| 395 | snd_dma_free_pages(runtime->dma_buffer_p); |
| 396 | kfree(runtime->dma_buffer_p); |
| 397 | } |
| 398 | snd_pcm_set_runtime_buffer(substream, NULL); |
| 399 | return 0; |
| 400 | } |
Takashi Iwai | e88e8ae6 | 2006-04-28 15:13:40 +0200 | [diff] [blame] | 401 | |
| 402 | EXPORT_SYMBOL(snd_pcm_lib_free_pages); |
Clemens Ladisch | 681b84e | 2009-12-18 09:29:00 +0100 | [diff] [blame] | 403 | |
| 404 | int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, |
| 405 | size_t size, gfp_t gfp_flags) |
| 406 | { |
| 407 | struct snd_pcm_runtime *runtime; |
| 408 | |
| 409 | if (PCM_RUNTIME_CHECK(substream)) |
| 410 | return -EINVAL; |
| 411 | runtime = substream->runtime; |
| 412 | if (runtime->dma_area) { |
| 413 | if (runtime->dma_bytes >= size) |
| 414 | return 0; /* already large enough */ |
| 415 | vfree(runtime->dma_area); |
| 416 | } |
| 417 | runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL); |
| 418 | if (!runtime->dma_area) |
| 419 | return -ENOMEM; |
| 420 | runtime->dma_bytes = size; |
| 421 | return 1; |
| 422 | } |
| 423 | EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer); |
| 424 | |
| 425 | /** |
| 426 | * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer |
| 427 | * @substream: the substream with a buffer allocated by |
| 428 | * snd_pcm_lib_alloc_vmalloc_buffer() |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 429 | * |
| 430 | * Return: Zero if successful, or a negative error code on failure. |
Clemens Ladisch | 681b84e | 2009-12-18 09:29:00 +0100 | [diff] [blame] | 431 | */ |
| 432 | int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream) |
| 433 | { |
| 434 | struct snd_pcm_runtime *runtime; |
| 435 | |
| 436 | if (PCM_RUNTIME_CHECK(substream)) |
| 437 | return -EINVAL; |
| 438 | runtime = substream->runtime; |
| 439 | vfree(runtime->dma_area); |
| 440 | runtime->dma_area = NULL; |
| 441 | return 0; |
| 442 | } |
| 443 | EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer); |
| 444 | |
| 445 | /** |
| 446 | * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct |
| 447 | * @substream: the substream with a buffer allocated by |
| 448 | * snd_pcm_lib_alloc_vmalloc_buffer() |
| 449 | * @offset: offset in the buffer |
| 450 | * |
| 451 | * This function is to be used as the page callback in the PCM ops. |
Yacine Belkadi | eb7c06e | 2013-03-11 22:05:14 +0100 | [diff] [blame] | 452 | * |
| 453 | * Return: The page struct, or %NULL on failure. |
Clemens Ladisch | 681b84e | 2009-12-18 09:29:00 +0100 | [diff] [blame] | 454 | */ |
| 455 | struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, |
| 456 | unsigned long offset) |
| 457 | { |
| 458 | return vmalloc_to_page(substream->runtime->dma_area + offset); |
| 459 | } |
| 460 | EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page); |