Messages in this thread |  | | Subject | RE: Calculating kernel logical address .. | From | Alan Cox <> | Date | 10 Sep 2002 00:09:53 +0100 |
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On Mon, 2002-09-09 at 23:52, Imran Badr wrote: > > But the buffer which I am concerned about was allocated my kmalloc() and > mapped to the process space in mmap(). AFAIK, kmalloc'ed buffers are > guaranteed to be mapped.
In which case its all nice and easy. You can safely use virt_to_bus on the buffer in question (although for 2.5 you will need to use the pci api). There is a nice clean worked example in each of the pci sound drivers. Basically it goes
addr = kmalloc(blah) phys_addr = virt_to_bus(addr)
and then use
remap_page_range(vma->vm_start, phys_addr, size, vma->vm_page_prot)
in the mmap function
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