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cache coherency on I/O

To: Ralf Baechle <ralf@oss.sgi.com>
Subject: cache coherency on I/O
From: Vivien Chappelier <vivien.chappelier@enst-bretagne.fr>
Date: Thu, 3 Jan 2002 22:19:51 +0100 (CET)
Cc: linux-mips@oss.sgi.com
Sender: owner-linux-mips@oss.sgi.com
Hi,

        Here is a patch to fix cache coherency when doing I/O on the
O2. It simply adds writeback and invalidate when unmapping DMA
memory. This fixes coherency when reading from a device. It
also adds support for mapping/unmapping pages for both the IP27 and
the O2.

Vivien Chappelier.

Attachment: linux-O2-coherent_io.diff
Description: Text document

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