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    SubjectRe: [PATCH] pci: print out DMA mask info
    On Fri, Oct 10, 2008 at 04:32:07PM +0900, FUJITA Tomonori wrote:
    ...
    > > > Well, that's because I wrote gart's alloc_coherent and introduced
    > > > dma_alloc_coherent_mask. ;)
    > >
    > > oh. it is in tip
    >
    > Yeah, it's in tip. But the current gart code uses coherent_dma_mask
    > properly (GART in tip works in the same way as the current
    > GART). IIRC, other X86 hardware IOMMUs (VT-d, Calgary, AMD) uses
    > dma_mask in dma_alloc_coherent (AMD in tip uses coherent_dma_mask).

    This is a bug. Care to submit a patch to fix it?
    I don't have any of the docs or HW (VT-d, Calgary) to test it.


    > > then can we remove consistent_dma_mask? just use dma_mask instead for all.
    >
    > I don't think we can. One architecture needs it. The above usb
    > chip seems to need it.

    As noted before, several PCI-X devices support 64-bit DMA for payload
    data but only 32-bit DMA for control data.

    thanks,
    grant


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