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Date: Fri, 27 Jun 2003 14:43:38 -0600
From: Scott Long <scott_long@btc.adaptec.com>
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To: Andrew Gallatin <gallatin@cs.duke.edu>
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cc: freebsd-arch@freebsd.org
Subject: Re: API change for bus_dma
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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