ddi_dma_buf_setup(9F)

NAME

ddi_dma_buf_setup − easier DMA setup for use with buffer structures

SYNOPSIS

#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dma_buf_setup(dev_info_t ∗dip, struct buf ∗bp,
u_int flags, int (∗waitfp)(caddr_t),
caddr_t arg, ddi_dma_lim_t ∗lim, ddi_dma_handle_t ∗handlep
);

ARGUMENTS

dip A pointer to the device’s dev_info structure.

bp A pointer to a system buffer structure (see buf(9S)).

flags Flags that go into a ddi_dma_req structure (see ddi_dma_req(9S)).

waitfp The address of a function to call back later if resources aren’t available now. The special function addresses DDI_DMA_SLEEP and DDI_DMA_DONTWAIT (see ddi_dma_req(9S)) are taken to mean, respectively, wait until resources are available, or do not wait at all and do not schedule a callback.

arg Argument to be passed to a callback function, if such a function is specified.

lim A pointer to a DMA limits structure for this device (see ddi_dma_lim(9S)). If this pointer is NULL, a default set of DMA limits is assumed.

handlep Pointer to a DMA handle. See ddi_dma_setup(9F) for a discussion of handle.

INTERFACE LEVEL

SPARC architecture specific (SPARC DDI).

DESCRIPTION

ddi_dma_buf_setup() is an interface to ddi_dma_setup(9F). It uses its arguments to construct an appropriate ddi_dma_req structure and calls ddi_dma_setup() with it.

RETURN VALUES

See ddi_dma_setup(9F) for the possible return values for this function.

CONTEXT

ddi_dma_buf_setup() can be called from user or interrupt context, except when waitfp is set to DDI_DMA_SLEEP, in which case it can be called from user context only.

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