1SND_PCM_LIB_ALLOC_VM(9)          Sound Devices         SND_PCM_LIB_ALLOC_VM(9)
2
3
4

NAME

6       snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
7

SYNOPSIS

9       int
10                                            snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream * substream,
11                                            size_t size);
12

ARGUMENTS

14       substream
15           the substream to allocate the buffer to
16
17       size
18           the requested buffer size, in bytes
19

DESCRIPTION

21       Allocates the PCM substream buffer using vmalloc, i.e., the memory is
22       contiguous in kernel virtual space, but not in physical memory. Use
23       this if the buffer is accessed by kernel code but not by device DMA.
24

RETURN

26       1 if the buffer was changed, 0 if not changed, or a negative error
27       code.
28

30Kernel Hackers Manual 3.10         June 2019           SND_PCM_LIB_ALLOC_VM(9)
Impressum