ddi_iomin(9F) manual page
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ddi_iomin - find minimum alignment and transfer size for DMA
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_iomin(dev_info_t *dip, int initial, int streaming);
Solaris
DDI specific (Solaris DDI).
- dip
- A pointer to the device’s dev_info
structure.
- initial
- The initial minimum DMA
transfer size in bytes. This may
be zero or an appropriate dlim_minxfer value for device’s ddi_dma_lim structure
(see ddi_dma_lim_sparc(9S)
or ddi_dma_lim_x86(9S)
). This value must be a
power of two.
- streaming
- This argument, if non-zero, indicates that the returned
value should be modified to account for streaming mode accesses (see ddi_dma_req(9S)
for a discussion of streaming versus non-streaming access mode).
ddi_iomin(), finds out the minimum DMA
transfer size for the device pointed
to by dip. This provides a mechanism by which a driver can determine the
effects of underlying caches as well as intervening bus adapters on the
granularity of a DMA transfer.
ddi_iomin() returns the minimum
DMA
transfer size for the calling device, or it returns zero, which means
that you cannot get there from here.
This function can be called
from user or interrupt context.
ddi_dma_devalign(9F)
, ddi_dma_setup(9F)
,
ddi_dma_sync(9F)
, ddi_dma_lim_sparc(9S)
, ddi_dma_lim_x86(9S)
, ddi_dma_req(9S)
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