API change for bus_dma

[Scott Long]

Andrew Gallatin wrote:
> Scott Long writes:
>  > 
>  > As you hinted below, BUS_DMA_NOWAIT does what you want.  It will return
>  > ENOMEM to the caller if the bounce buffers cannot be pre-allocated
>  > during bus_dmamap_load().
> 
> OK, thanks.  I looks like sparc64 also returns ENOMEM if it runs out of
> sgmap space..
> 
> One more question: What's the FreeBSD equivalent of Solaris'
> DDI_DMA_CONSISTENT and DDI_DMA_STREAMING?
> 
> Thanks,
> 
> Drew

I'm not familiar with Solaris DDI.  bus_dmamem_alloc() is guaranteed to
give you contiguous memory that doesn't require bouncing (or ENOMEM if
that's not possible).  I can't imagine what DDI_DMA_STREAMING is.

Scott