SND_PCM_LIB_ALLOC_VM
Section: Sound Devices (9)
Updated: February 2011
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NAME
snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
SYNOPSIS
-
int snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream * substream, size_t size);
ARGUMENTS
substream
-
- the substream to allocate the buffer to
size
-
the requested buffer size, in bytes
DESCRIPTION
Allocates the PCM substream buffer using
vmalloc, i.e., the memory is contiguous in kernel virtual space, but not in physical memory. Use this if the buffer is accessed by kernel code but not by device DMA.
Returns 1 if the buffer was changed, 0 if not changed, or a negative error code.
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