1. NAME▲

snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type

2. SYNOPSIS ▲

int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *  substream , int  type , struct device *  data , size_t  size , size_t  max );

3. ARGUMENTS ▲

substream
    the pcm substream instance

type
    DMA type (SNDRV_DMA_TYPE_*)

data
    DMA type dependent data

size
    the requested pre-allocation size in bytes

max
    the max. allowed pre-allocation size

4. 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.

5. RETURN ▲

Zero if successful, or a negative error code on failure.

6. COPYRIGHT ▲