Messages in this thread | | | Date | Tue, 31 May 2005 10:51:27 -0500 | From | Timur Tabi <> | Subject | Re: Will __pa(vmalloc()) ever work? |
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Gerd Knorr wrote:
> You should use vmalloc_to_page() (this does the page-table walking > with correct locking), then the usual dma mapping interface > (pci_map_page() or pci_map_sg()) to get bus address(es) you can pass > to your device for DMA.
My problem is that I don't know where the memory came from. It could have been allocated via kmalloc, or vmalloc, or anywhere else. Can I call vmalloc_to_page() on memory allocated via kmalloc()? If the answer is no, then how can I tell whether the memory was allocated via vmalloc() or some other method? I need a reliable virtual-to-physical (or virtual-to-bus, which is the same thing on x86 architectures) method for any memory address.
-- Timur Tabi Staff Software Engineer timur.tabi@ammasso.com
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