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ddi_dma_nextcookie(9f) [bsd man page]

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

NAME
ddi_dma_nextcookie - retrieve subsequent DMA cookie SYNOPSIS
#include <sys/ddi.h> #include <sys/sunddi.h> void ddi_dma_nextcookie(ddi_dma_handle_t handle, ddi_dma_cookie_t *cookiep); PARAMETERS
handle The handle previously allocated by a call to ddi_dma_alloc_handle(9F). cookiep A pointer to a ddi_dma_cookie(9S) structure. INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). DESCRIPTION
ddi_dma_nextcookie() retrieves subsequent DMA cookies for a DMA object. ddi_dma_nextcookie() fills in the ddi_dma_cookie(9S) structure pointed to by cookiep. The ddi_dma_cookie(9S) structure must be allocated prior to calling ddi_dma_nextcookie(). The DMA cookie count returned by ddi_dma_buf_bind_handle(9F), ddi_dma_addr_bind_handle(9F), or ddi_dma_getwin(9F) indicates the number of DMA cookies a DMA object consists of. If the resulting cookie count, N, is larger than 1, ddi_dma_nextcookie() must be called N-1 times to retrieve all DMA cookies. CONTEXT
ddi_dma_nextcookie() can be called from user, kernel, or interrupt context. EXAMPLES
Example 1: process a scatter-gather list of I/O requests This example demonstrates the use of ddi_dma_nextcookie() to process a scatter-gather list of I/O requests. /* setup scatter-gather list with multiple DMA cookies */ ddi_dma_cookie_t dmacookie; uint_t ccount; ... status = ddi_dma_buf_bind_handle(handle, bp, DDI_DMA_READ, NULL, NULL, &dmacookie, &ccount); if (status == DDI_DMA_MAPPED) { /* program DMA engine with first cookie */ while (--ccount > 0) { ddi_dma_nextcookie(handle, &dmacookie); /* program DMA engine with next cookie */ } } ... SEE ALSO
ddi_dma_addr_bind_handle(9F), ddi_dma_alloc_handle(9F), ddi_dma_buf_bind_handle(9F), ddi_dma_unbind_handle(9F), ddi_dma_cookie(9S) Writing Device Drivers SunOS 5.10 26 Sep 1994 ddi_dma_nextcookie(9F)

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

NAME
ddi_dma_nextcookie - retrieve subsequent DMA cookie SYNOPSIS
#include <sys/ddi.h> #include <sys/sunddi.h> void ddi_dma_nextcookie(ddi_dma_handle_t handle, ddi_dma_cookie_t *cookiep); PARAMETERS
handle The handle previously allocated by a call to ddi_dma_alloc_handle(9F). cookiep A pointer to a ddi_dma_cookie(9S) structure. INTERFACE LEVEL
Solaris DDI specific (Solaris DDI). DESCRIPTION
ddi_dma_nextcookie() retrieves subsequent DMA cookies for a DMA object. ddi_dma_nextcookie() fills in the ddi_dma_cookie(9S) structure pointed to by cookiep. The ddi_dma_cookie(9S) structure must be allocated prior to calling ddi_dma_nextcookie(). The DMA cookie count returned by ddi_dma_buf_bind_handle(9F), ddi_dma_addr_bind_handle(9F), or ddi_dma_getwin(9F) indicates the number of DMA cookies a DMA object consists of. If the resulting cookie count, N, is larger than 1, ddi_dma_nextcookie() must be called N-1 times to retrieve all DMA cookies. CONTEXT
ddi_dma_nextcookie() can be called from user, kernel, or interrupt context. EXAMPLES
Example 1: process a scatter-gather list of I/O requests This example demonstrates the use of ddi_dma_nextcookie() to process a scatter-gather list of I/O requests. /* setup scatter-gather list with multiple DMA cookies */ ddi_dma_cookie_t dmacookie; uint_t ccount; ... status = ddi_dma_buf_bind_handle(handle, bp, DDI_DMA_READ, NULL, NULL, &dmacookie, &ccount); if (status == DDI_DMA_MAPPED) { /* program DMA engine with first cookie */ while (--ccount > 0) { ddi_dma_nextcookie(handle, &dmacookie); /* program DMA engine with next cookie */ } } ... SEE ALSO
ddi_dma_addr_bind_handle(9F), ddi_dma_alloc_handle(9F), ddi_dma_buf_bind_handle(9F), ddi_dma_unbind_handle(9F), ddi_dma_cookie(9S) Writing Device Drivers SunOS 5.10 26 Sep 1994 ddi_dma_nextcookie(9F)

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