From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Tue, 04 May 2004 23:13:23 +0000 Subject: Re: [RFC] I/O MCA recovery Message-Id: <16536.9107.246899.698701@napali.hpl.hp.com> List-Id: References: <200405040954.09524.jbarnes@engr.sgi.com> In-Reply-To: <200405040954.09524.jbarnes@engr.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Tue, 4 May 2004 15:58:32 -0700, Jesse Barnes said: Jesse> But my point was: doesn't in/out hard fail on other ia64 Jesse> platforms too? No. AFAIK, inX/outX is always supposed to soft-fail. On zx1-based machines, firmware initializes the chipset such that memory-mapped I/O will hard-fail. Intel chipsets will always softfail, even for memory-mapped I/O. Anybody knows what IBM's chipset does in this regard? Jesse> Sure, that makes sense. The other part of the implementation Jesse> was to deal with regular MMIO accesses though--userspace Jesse> drivers want to get signalled when an error occurs, would you Jesse> propose the page fault mechanism to detect that as well, or Jesse> is an MCA handler a better way to go? I don't have a strong opinion on this particular issue. --david