DDI_DMA_NUMWIN(9F) Kernel Functions for Drivers DDI_DMA_NUMWIN(9F)
NAME
ddi_dma_numwin - retrieve number of DMA windows
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_numwin(
ddi_dma_handle_t handle,
uint_t *nwinp);
PARAMETERS
handle The
DMA handle previously allocated by a call to
ddi_dma_alloc_handle(9F).
nwinp Upon a successful return,
nwinp will contain the number
of
DMA windows for this object.
INTERFACE LEVEL
illumos DDI specific (illumos DDI).
DESCRIPTION
ddi_dma_numwin() returns the number of
DMA windows for a
DMA object
if partial resource allocation was permitted.
RETURN VALUES
ddi_dma_numwin() returns:
DDI_SUCCESS Successfully filled in the number of
DMA windows.
DDI_FAILURE DMA windows are not activated.
CONTEXT
ddi_dma_numwin() can be called from user, kernel, or interrupt
context.
SEE ALSO
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 DDI_DMA_NUMWIN(9F)
