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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

Solaris DDI specific (Solaris 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

Index

NAME

SYNOPSIS

PARAMETERS

INTERFACE LEVEL

DESCRIPTION

RETURN VALUES

CONTEXT

SEE ALSO

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