Re: API change for bus_dma

From: Scott Long (scott_long_at_btc.adaptec.com)
Date: 06/27/03

  • Next message: Andrew Gallatin: "Re: API change for bus_dma" 
    Date: Fri, 27 Jun 2003 14:43:38 -0600
To: Andrew Gallatin <gallatin@cs.duke.edu>

    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

    _______________________________________________
    freebsd-arch@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-arch
    To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"

  • Next message: Andrew Gallatin: "Re: API change for bus_dma"