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snd_pcm_lib_preallocate_pages
Langue: en
Version: June 2009 (debian - 07/07/09)
Section: 9 (Appels noyau Linux)
NAME
snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA typeSYNOPSIS
- int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream * substream, int type, struct device * data, size_t size, size_t max);
ARGUMENTS
substream
- the pcm substream instance
type
- DMA type (SNDRV_DMA_TYPE_*)
data
- DMA type dependant data
size
- the requested pre-allocation size in bytes
max
- the max. allowed pre-allocation size
DESCRIPTION
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.
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