Messages in this thread | | | Date | Wed, 12 Nov 2008 20:03:34 -0700 | From | Matthew Wilcox <> | Subject | Re: dma_pool_alloc restrict < 4GB address |
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On Wed, Nov 12, 2008 at 02:14:24PM -0800, Anil kumar wrote: > Is there anyway to restrict the returned bus address(dma address) from dma_poll_alloc to < 4GB ? > The function returns a dma address(of type dma_addr_t). Is there anyway I can ensure to restrict it to < 4B address. > I guess we can do that in pci_alloc_consistent as by default it returns 32bit address.
dma_pool_alloc (as described in the documentation ...) allocates memory using dma_alloc_coherent(). As long as you've set the coherent mask to 32-bit (or left it alone, since it's 32-bit by default ...), you'll get 32-bit dma addresses back.
-- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step."
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