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Linux Kernel
3.7.1
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All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
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Linux Kernel
3.7.1
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#include <asm/io.h>#include <linux/time.h>#include <linux/init.h>#include <linux/slab.h>#include <linux/moduleparam.h>#include <linux/vmalloc.h>#include <linux/export.h>#include <sound/core.h>#include <sound/pcm.h>#include <sound/info.h>#include <sound/initval.h>Go to the source code of this file.
Macros | |
| #define | preallocate_info_init(s) |
| #define preallocate_info_init | ( | s | ) |
Definition at line 232 of file pcm_memory.c.
| int _snd_pcm_lib_alloc_vmalloc_buffer | ( | struct snd_pcm_substream * | substream, |
| size_t | size, | ||
| gfp_t | gfp_flags | ||
| ) |
Definition at line 415 of file pcm_memory.c.
| EXPORT_SYMBOL | ( | snd_pcm_lib_preallocate_free_for_all | ) |
| EXPORT_SYMBOL | ( | snd_pcm_lib_preallocate_pages | ) |
| EXPORT_SYMBOL | ( | snd_pcm_lib_preallocate_pages_for_all | ) |
| EXPORT_SYMBOL | ( | snd_pcm_lib_malloc_pages | ) |
| EXPORT_SYMBOL | ( | snd_pcm_lib_free_pages | ) |
| EXPORT_SYMBOL | ( | _snd_pcm_lib_alloc_vmalloc_buffer | ) |
| EXPORT_SYMBOL | ( | snd_pcm_lib_free_vmalloc_buffer | ) |
| EXPORT_SYMBOL | ( | snd_pcm_lib_get_vmalloc_page | ) |
| module_param | ( | preallocate_dma | , |
| int | , | ||
| 0444 | |||
| ) |
| module_param | ( | maximum_substreams | , |
| int | , | ||
| 0444 | |||
| ) |
| MODULE_PARM_DESC | ( | preallocate_dma | , |
| "Preallocate DMA memory when the PCM devices are initialized." | |||
| ) |
| MODULE_PARM_DESC | ( | maximum_substreams | , |
| "Maximum substreams with preallocated DMA memory." | |||
| ) |
| int snd_pcm_lib_free_pages | ( | struct snd_pcm_substream * | substream | ) |
snd_pcm_lib_free_pages - release the allocated DMA buffer. : the substream to release the DMA buffer
Releases the DMA buffer allocated via snd_pcm_lib_malloc_pages().
Returns zero if successful, or a negative error code on failure.
Definition at line 395 of file pcm_memory.c.
| int snd_pcm_lib_free_vmalloc_buffer | ( | struct snd_pcm_substream * | substream | ) |
snd_pcm_lib_free_vmalloc_buffer - free vmalloc buffer : the substream with a buffer allocated by snd_pcm_lib_alloc_vmalloc_buffer()
Definition at line 441 of file pcm_memory.c.
|
read |
snd_pcm_lib_get_vmalloc_page - map vmalloc buffer offset to page struct : the substream with a buffer allocated by snd_pcm_lib_alloc_vmalloc_buffer() : offset in the buffer
This function is to be used as the page callback in the PCM ops.
Definition at line 462 of file pcm_memory.c.
| int snd_pcm_lib_malloc_pages | ( | struct snd_pcm_substream * | substream, |
| size_t | size | ||
| ) |
snd_pcm_lib_malloc_pages - allocate the DMA buffer : the substream to allocate the DMA buffer to : the requested buffer size in bytes
Allocates the DMA buffer on the BUS type given earlier to snd_pcm_lib_preallocate_xxx_pages().
Returns 1 if the buffer is changed, 0 if not changed, or a negative code on failure.
Definition at line 343 of file pcm_memory.c.
| int snd_pcm_lib_preallocate_free | ( | struct snd_pcm_substream * | substream | ) |
| int snd_pcm_lib_preallocate_pages | ( | struct snd_pcm_substream * | substream, |
| int | type, | ||
| struct device * | data, | ||
| size_t | size, | ||
| size_t | max | ||
| ) |
snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type : the pcm substream instance : DMA type (SNDRV_DMA_TYPE_*) : DMA type dependent data : the requested pre-allocation size in bytes : the max. allowed pre-allocation size
Do pre-allocation for the given DMA buffer type.
When substream->dma_buf_id is set, the function tries to look for the reserved buffer, and the buffer is not freed but reserved at destruction time. The dma_buf_id must be unique for all systems (in the same DMA buffer type) e.g. using snd_dma_pci_buf_id().
Returns zero if successful, or a negative error code on failure.
Definition at line 270 of file pcm_memory.c.
| int snd_pcm_lib_preallocate_pages_for_all | ( | struct snd_pcm * | pcm, |
| int | type, | ||
| void * | data, | ||
| size_t | size, | ||
| size_t | max | ||
| ) |
snd_pcm_lib_preallocate_pages_for_all - pre-allocation for continuous memory type (all substreams) : the pcm instance : DMA type (SNDRV_DMA_TYPE_*) : DMA type dependent data : the requested pre-allocation size in bytes : the max. allowed pre-allocation size
Do pre-allocation to all substreams of the given pcm for the specified DMA type.
Returns zero if successful, or a negative error code on failure.
Definition at line 294 of file pcm_memory.c.
1.8.2