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

illumos DDI specific (illumos 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.