Messages in this thread |  | | Date | Sun, 18 May 2003 10:22:03 -0700 | From | Grant Grundler <> | Subject | Re: [Linux-ia64] Re: [patch] support 64 bit pci_alloc_consistent |
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On Sun, May 18, 2003 at 09:43:41AM +0000, Arjan van de Ven wrote: > Most drivers will just say "look I > can do THIS much. I don't give a flying fish about how much of > that you actually use". At least in the probing code.
The platform code needs a way to indicate the given mask will not work. Rejecting proposals by the driver seems reasonable if the driver only supports two different masks anyway (eg 64 and 32-bit).
In the case of a platform requiring 64-bit masks for consistent mappings, the platform DMA code must reject proposals for non-64-bit DMA masks. (eg PCI-X device implementing less than 64-bits)
In both cases the driver will care because it will crash the box otherwise.
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