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author | Takashi Iwai <tiwai@suse.de> | 2010-03-01 12:38:49 +0100 |
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committer | Takashi Iwai <tiwai@suse.de> | 2010-03-01 12:38:49 +0100 |
commit | 12c2a682b55a40f2a986e36d6632110029bc63a5 (patch) | |
tree | ba21f049e4859411f6c135d597dc26260963ce7c /sound/core/pcm_memory.c | |
parent | a86ba28583987b85845ed61be5f12aafb5fc4971 (diff) | |
parent | aefbd3e823d4fe219bb6420b0cac505847270507 (diff) | |
download | linux-12c2a682b55a40f2a986e36d6632110029bc63a5.tar.bz2 |
Merge branch 'topic/misc' into for-linus
Diffstat (limited to 'sound/core/pcm_memory.c')
-rw-r--r-- | sound/core/pcm_memory.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index caa7796bc2f5..d6d49d6651f9 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -23,6 +23,7 @@ #include <linux/time.h> #include <linux/init.h> #include <linux/moduleparam.h> +#include <linux/vmalloc.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/info.h> @@ -434,3 +435,57 @@ int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream) } EXPORT_SYMBOL(snd_pcm_lib_free_pages); + +int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, + size_t size, gfp_t gfp_flags) +{ + struct snd_pcm_runtime *runtime; + + if (PCM_RUNTIME_CHECK(substream)) + return -EINVAL; + runtime = substream->runtime; + if (runtime->dma_area) { + if (runtime->dma_bytes >= size) + return 0; /* already large enough */ + vfree(runtime->dma_area); + } + runtime->dma_area = __vmalloc(size, gfp_flags, PAGE_KERNEL); + if (!runtime->dma_area) + return -ENOMEM; + runtime->dma_bytes = size; + return 1; +} +EXPORT_SYMBOL(_snd_pcm_lib_alloc_vmalloc_buffer); + +/** + * snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer + * @substream: the substream with a buffer allocated by + * snd_pcm_lib_alloc_vmalloc_buffer() + */ +int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime; + + if (PCM_RUNTIME_CHECK(substream)) + return -EINVAL; + runtime = substream->runtime; + vfree(runtime->dma_area); + runtime->dma_area = NULL; + return 0; +} +EXPORT_SYMBOL(snd_pcm_lib_free_vmalloc_buffer); + +/** + * snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct + * @substream: the substream with a buffer allocated by + * snd_pcm_lib_alloc_vmalloc_buffer() + * @offset: offset in the buffer + * + * This function is to be used as the page callback in the PCM ops. + */ +struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, + unsigned long offset) +{ + return vmalloc_to_page(substream->runtime->dma_area + offset); +} +EXPORT_SYMBOL(snd_pcm_lib_get_vmalloc_page); |