PCM Memory Management
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Chapter 2. PCM API
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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