DDI_DMA_BURSTSIZES(9F) Kernel Functions for Drivers DDI_DMA_BURSTSIZES(9F)
ddi_dma_burstsizes - find out the allowed burst sizes for a DMA
mapping
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_burstsizes(ddi_dma_handle_t handle);
illumos DDI specific (illumos DDI).
handle
A DMA handle.
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.
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.
This function can be called from user or interrupt context.
ddi_dma_alloc_handle(9F), ddi_dma_attr(9S)
Writing Device Drivers
May 24, 2014 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
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.
SEE ALSO
ddi_dma_alloc_handle(9F), ddi_dma_attr(9S)
Writing Device Drivers
May 24, 2014 DDI_DMA_BURSTSIZES(9F)