Messages in this thread |  | | Date | Wed, 3 Oct 2001 18:03:54 -0400 | From | Ben Collins <> | Subject | Re: how to get virtual address from dma address |
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On Wed, Oct 03, 2001 at 02:48:58PM -0700, Linux Bigot wrote: > oops! I am sorry. I did not meant "pci_unmap_single" > pci_unmap_single. > > I meant to get a routine which does exactly opposite > of what pci_map_single does, i.e., give me a virtual > address for a dma address.
pci_unmap_single is the exact opposite of pci_map_single. It unmaps a memory region. It just doesn't do what you want.
Bottom line, to keep your driver portable, you are going to have to keep a mapping of the dma and real addresses either in a structure as most drivers do, or as a hash like a couple difficult ones do.
Ben
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