[linuxsh-shmedia-dev] Re: [linuxsh-shmedia-bk] bk commit: curnowr@linsvr6.uk.superh.com:/build/archbuild/swbuild/curnowr/linux-2.4-tlb

[Paul M. <le...@li...>]

On Tue, Jul 01, 2003 at 03:01:55PM +0100, Richard Curnow wrote:
>     diff -Nru a/include/asm-sh64/pci.h b/include/asm-sh64/pci.h
>     --- a/include/asm-sh64/pci.h	Tue Jul  1 15:01:55 2003
>     +++ b/include/asm-sh64/pci.h	Tue Jul  1 15:01:55 2003
>     @@ -167,6 +167,7 @@
>      		} else {
>      			sg[i].dma_address =3D page_to_bus(sg[i].page) +
>      					    sg[i].offset;
>     +			dma_cache_wback_inv((unsigned long) bus_to_virt(sg[i].dma_address=
), sg[i].length);
>      		}
>      	}
>     =20
If you do this, you'll also want to do a similar flush in pci_unmap_sg(). I
don't know if this is specifically needed, since on anything else requiring
coherency, it seems to be omitted.

Though in its present implementation, sg[i].address will =3D=3D 0, so it wi=
ll
just continue through the loop instead of flushing the page.

Again, I don't think this will be needed, but you can try it out just the
same.