snd_pcm_lib_preallocate_pages(9) [centos man page]
SND_PCM_LIB_PREALLOC(9) PCM API SND_PCM_LIB_PREALLOC(9)NAME
snd_pcm_lib_preallocate_pages - pre-allocation for the given DMA type
int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream * substream, int type, struct device * data, size_t size, size_t max);
the pcm substream instance
DMA type (SNDRV_DMA_TYPE_*)
DMA type dependent data
the requested pre-allocation size in bytes
the max. allowed pre-allocation size
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.
Zero if successful, or a negative error code on failure.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SND_PCM_LIB_PREALLOC(9)
Check Out this Related Man Page
ddi_dma_numwin(9F) Kernel Functions for Drivers ddi_dma_numwin(9F)NAME
ddi_dma_numwin - retrieve number of DMA windows
int ddi_dma_numwin(ddi_dma_handle_t handle, uint_t *nwinp);
handle The DMA handle previously allocated by a call to ddi_dma_alloc_handle(9F).
nwinp Upon a successful return, nwinp will contain the number of DMA windows for this object.
Solaris DDI specific (Solaris DDI).
ddi_dma_numwin() returns the number of DMA windows for a DMA object if partial resource allocation was permitted.
DDI_SUCCESS Successfully filled in the number of DMA windows.
DDI_FAILURE DMA windows are not activated.
ddi_dma_numwin() can be called from user, kernel, or interrupt context.
SEE ALSO ddi_dma_addr_bind_handle(9F), ddi_dma_alloc_handle(9F), ddi_dma_buf_bind_handle(9F), ddi_dma_unbind_handle(9F)
Writing Device Drivers
SunOS 5.11 29 Sep 1994 ddi_dma_numwin(9F)
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