DDI_DMA_BURSTSIZES(9F) Kernel Functions for Drivers DDI_DMA_BURSTSIZES(9F)


NAME


ddi_dma_burstsizes - find out the allowed burst sizes for a DMA mapping

SYNOPSIS


#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>


int ddi_dma_burstsizes(ddi_dma_handle_t handle);


INTERFACE LEVEL


Solaris DDI specific (Solaris DDI).

PARAMETERS


handle
A DMA handle.


DESCRIPTION


ddi_dma_burstsizes() returns the allowed burst sizes for a DMA mapping.
This value is derived from the dma_attr_burstsizes member of the
ddi_dma_attr(9S) structure, but it shows the allowable burstsizes after
imposing on it the limitations of other device layers in addition to
device's own limitations.

RETURN VALUES


ddi_dma_burstsizes() returns a binary encoded value of the allowable DMA
burst sizes. See ddi_dma_attr(9S) for a discussion of DMA burst sizes.

CONTEXT


This function can be called from user or interrupt context.

SEE ALSO


ddi_dma_alloc_handle(9F), ddi_dma_attr(9S)


Writing Device Drivers


May 24, 2014 DDI_DMA_BURSTSIZES(9F)