man pages section 9: DDI and DKI Kernel Functions

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Updated: July 2014



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);

Interface Level

Solaris DDI specific (Solaris DDI).



A DMA handle that was filled in by a successful call to ddi_dma_setup(9F).


ddi_dma_burstsizes() returns the allowed burst sizes for a DMA mapping. This value is derived from the dlim_burstsizes member of the ddi_dma_lim_sparc(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_lim_sparc(9S) for a discussion of DMA burst sizes.


This function can be called from user or interrupt context.

See also

ddi_dma_devalign(9F), ddi_dma_setup(9F), ddi_dma_lim_sparc (9S), ddi_dma_req(9S)

Writing Device Drivers for Oracle Solaris 11.2