Re: [PATCH] Implement pci_set_dma_mask() in terms of the dma_ops

On Mon, 2007-12-17 at 11:02 +0100, Christoph Hellwig wrote:

On Mon, Dec 17, 2007 at 05:35:53PM +1100, Michael Ellerman wrote:

quoted

To save adding a hook to the dma mapping ops, pci-set_consistent_dma_mask()
simply calls the dma_set_mask() hook and then copies the new mask into
dev.coherenet_dma_mask.

How is this supposed to work?  There are various devices around that
want different mask for coherent vs streaming dma mappings, and we need
to tell the iommu that we're setting it for either the former or the
latter.

I don't think we ever supported that difference. Too broken HW for us.

We don't use coherent_dma_mask for anything at the moment on powerpc.

Ben.