PCM Memory Management
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## PCM Memory Management

snd_pcm_lib_preallocate_free_for_all — release all pre-allocated buffers on the pcm
snd_pcm_lib_preallocate_pages — pre-allocation for the given DMA type
snd_pcm_lib_preallocate_pages_for_all — pre-allocation for continuous memory type (all substreams)
snd_pcm_sgbuf_ops_page — get the page struct at the given offset
snd_pcm_lib_malloc_pages — allocate the DMA buffer
snd_pcm_lib_free_pages — release the allocated DMA buffer.
snd_pcm_lib_free_vmalloc_buffer — free vmalloc buffer
snd_pcm_lib_get_vmalloc_page — map vmalloc buffer offset to page struct

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