Messages in this thread | | | From | Jes Sorensen <> | Date | 05 Jul 2001 23:06:25 +0200 |
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>>>>> "David" == David S Miller <davem@redhat.com> writes:
David> Alan Cox writes: >> Thats something we already know has to be fixed. Its true with or >> without an IOMMU that there may be cases where there is no free >> mapping space
David> True, but my intended point is that starving the SAC-only users David> then returning DAC addresses to DAC-capable devices is just as David> unacceptable.
David> When we have one of these compute cluster cards in the box, and David> Jes's suggested algorithm is used, the rest of the SAC devices David> in the box would be totally screwed once the IOMMU fills up.
The dma_mask in struct pci_dev tells you whether you are DAC capable. We pass a pointer to this struct when we call the pci_* functions so the required information needed to make the decision whether to return a SAC or a DAC address is already available.
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