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- wheezy 3.2.78-1
| SND_PCM_LIB_PREALLOC(9) | Sound Devices | SND_PCM_LIB_PREALLOC(9) |
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¶
substreamthe 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
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.COPYRIGHT¶
| March 2016 | Kernel Hackers Manual 3.2. |