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

ddi_dma_numwin - retrieve number of DMA windows

#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_numwin(ddi_dma_handle_t handle, uint_t *nwinp);

The DMA handle previously allocated by a call to ddi_dma_alloc_handle(9F).


Upon a successful return, nwinp will contain the number of DMA windows for this object.

illumos DDI specific (illumos DDI).

ddi_dma_numwin() returns the number of DMA windows for a DMA object if partial resource allocation was permitted.

ddi_dma_numwin() returns:


Successfully filled in the number of DMA windows.


DMA windows are not activated.

ddi_dma_numwin() can be called from user, kernel, or interrupt context.

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

September 29, 1994 OmniOS