On Tue, Nov 08, 2005 at 02:47:00PM -0800, Anil kumar wrote: > Hi Matthew, > > Thanks for the reply. > I can store the returned dma_addr from > pci_map_sg/single or pci_map_page in a driver > structure. > > struct page *page = > virt_to_page(Cmnd->request_buffer); > unsigned long offset = ((unsigned > long)Cmnd->request_buffer & > ~PAGE_MASK); > dma_addr_t busaddr = > pci_map_page(hostdata->pci_dev, > > page, offset, > > Cmnd->request_bufflen, > > scsi_to_pci_dma_dir(Cmnd->sc_data_direction)); > > But how do I convert this returned "busaddr" into a > virtual addr? You don't - that's architecture implementation detail which drivers have _zero_ business knowing about. As far as you're concerned, the virtual address is Cmnd->request_buffer. Anyway, you're using the wrong interface - pci_map_single() takes a virtual address. No need to play around getting the offset and struct page for pci_map_page() when pci_map_single() implements what you require. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
