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From: Linas Vepstas <linas@austin.ibm.com>
To: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
	linux-ia64@vger.kernel.org, "Luck, Tony" <tony.luck@intel.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	long <tlnguyen@snoqualmie.dp.intel.com>,
	linux-pci@atrey.karlin.mff.cuni.cz,
	linuxppc64-dev <linuxppc64-dev@ozlabs.org>
Subject: Re: [PATCH 2.6.13-rc1 07/10] IOCHK interface for I/O error handling/detecting
Date: Tue, 12 Jul 2005 21:14:01 +0000	[thread overview]
Message-ID: <20050712211401.GF26607@austin.ibm.com> (raw)
In-Reply-To: <42CB6961.2060508@jp.fujitsu.com>

On Wed, Jul 06, 2005 at 02:17:21PM +0900, Hidetoshi Seto was heard to remark:
> 
> Touching poisoned data become a MCA, so now it directly means

Several questions: 

Is MCA an exception or fault of some sort, so at some point, 
the kernel would catch a fault?

So when you say "Touching poisoned data become a MCA", you mean that
if the CPU attempts to read poisoned data through the pci-to-host
bridge, it will (at some point) catch an exception?

> +	ia64_mca_barrier(ret);

I assume that the point of this barrier is to make sure that the fault,
if any, is delivered before this routine returns?

--linas


WARNING: multiple messages have this Message-ID (diff)
From: Linas Vepstas <linas@austin.ibm.com>
To: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
	linux-ia64@vger.kernel.org, "Luck, Tony" <tony.luck@intel.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	long <tlnguyen@snoqualmie.dp.intel.com>,
	linux-pci@atrey.karlin.mff.cuni.cz,
	linuxppc64-dev <linuxppc64-dev@ozlabs.org>
Subject: Re: [PATCH 2.6.13-rc1 07/10] IOCHK interface for I/O error handling/detecting
Date: Tue, 12 Jul 2005 16:14:01 -0500	[thread overview]
Message-ID: <20050712211401.GF26607@austin.ibm.com> (raw)
In-Reply-To: <42CB6961.2060508@jp.fujitsu.com>

On Wed, Jul 06, 2005 at 02:17:21PM +0900, Hidetoshi Seto was heard to remark:
> 
> Touching poisoned data become a MCA, so now it directly means

Several questions: 

Is MCA an exception or fault of some sort, so at some point, 
the kernel would catch a fault?

So when you say "Touching poisoned data become a MCA", you mean that
if the CPU attempts to read poisoned data through the pci-to-host
bridge, it will (at some point) catch an exception?

> +	ia64_mca_barrier(ret);

I assume that the point of this barrier is to make sure that the fault,
if any, is delivered before this routine returns?

--linas


  parent reply	other threads:[~2005-07-12 21:14 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-07-06  4:53 [PATCH 2.6.13-rc1 01/10] IOCHK interface for I/O error handling/detecting Hidetoshi Seto
2005-07-06  4:53 ` Hidetoshi Seto
2005-07-06  4:58 ` [PATCH 2.6.13-rc1 02/10] " Hidetoshi Seto
2005-07-06  5:00   ` Hidetoshi Seto
2005-07-06  5:04 ` [PATCH 2.6.13-rc1 03/10] " Hidetoshi Seto
2005-07-06  5:04   ` Hidetoshi Seto
2005-07-12 19:51   ` Linas Vepstas
2005-07-12 19:51     ` Linas Vepstas
2005-07-13  0:18     ` [PATCH 2.6.13-rc1 03/10] IOCHK interface for I/O error Benjamin Herrenschmidt
2005-07-13  0:18       ` [PATCH 2.6.13-rc1 03/10] IOCHK interface for I/O error handling/detecting Benjamin Herrenschmidt
2005-07-13 22:42       ` Linas Vepstas
2005-07-13 22:42         ` Linas Vepstas
2005-07-13  1:33     ` Hidetoshi Seto
2005-07-13  1:33       ` Hidetoshi Seto
2005-07-06  5:07 ` [PATCH 2.6.13-rc1 04/10] " Hidetoshi Seto
2005-07-06  5:07   ` Hidetoshi Seto
2005-07-06  5:11 ` [PATCH 2.6.13-rc1 05/10] " Hidetoshi Seto
2005-07-06  5:11   ` Hidetoshi Seto
2005-07-18 19:21   ` Grant Grundler
2005-07-18 19:21     ` Grant Grundler
2005-07-06  5:14 ` [PATCH 2.6.13-rc1 06/10] " Hidetoshi Seto
2005-07-06  5:14   ` Hidetoshi Seto
2005-07-06  5:17 ` [PATCH 2.6.13-rc1 07/10] " Hidetoshi Seto
2005-07-06  5:17   ` Hidetoshi Seto
2005-07-08  4:37   ` david mosberger
2005-07-08  4:37     ` david mosberger
2005-07-08  5:44     ` Hidetoshi Seto
2005-07-08  5:44       ` Hidetoshi Seto
2005-07-08 19:05   ` Luck, Tony
2005-07-08 19:23   ` david mosberger
2005-07-08 20:17   ` Luck, Tony
2005-07-11 17:51   ` Jesse Barnes
2005-07-11 18:21   ` Luck, Tony
2005-07-11 19:21   ` david mosberger
2005-07-12 21:14   ` Linas Vepstas [this message]
2005-07-12 21:14     ` Linas Vepstas
2005-07-13  1:59     ` Hidetoshi Seto
2005-07-13  2:00       ` Hidetoshi Seto
2005-07-06  5:18 ` [PATCH 2.6.13-rc1 08/10] " Hidetoshi Seto
2005-07-06  5:18   ` Hidetoshi Seto
2005-07-12 22:22   ` Linas Vepstas
2005-07-12 22:22     ` Linas Vepstas
2005-07-13  1:36     ` Hidetoshi Seto
2005-07-13  1:36       ` Hidetoshi Seto
2005-07-06  5:20 ` [PATCH 2.6.13-rc1 09/10] " Hidetoshi Seto
2005-07-06  5:20   ` Hidetoshi Seto
2005-07-06  5:21 ` [PATCH 2.6.13-rc1 10/10] " Hidetoshi Seto
2005-07-06  5:21   ` Hidetoshi Seto
2005-07-06  6:26 ` [PATCH 2.6.13-rc1 01/10] IOCHK interface for I/O error 
2005-07-06  6:26   ` [PATCH 2.6.13-rc1 01/10] IOCHK interface for I/O error handling/detecting YOSHIFUJI Hideaki / 吉藤英明
2005-07-06 10:15   ` Hidetoshi Seto
2005-07-06 10:15     ` Hidetoshi Seto
2005-07-07 18:41 ` Greg KH
2005-07-07 18:41   ` Greg KH
2005-07-07 22:27   ` [PATCH 2.6.13-rc1 01/10] IOCHK interface for I/O error Benjamin Herrenschmidt
2005-07-07 22:27     ` [PATCH 2.6.13-rc1 01/10] IOCHK interface for I/O error handling/detecting Benjamin Herrenschmidt
2005-07-08 12:22     ` Hidetoshi Seto
2005-07-08 12:22       ` Hidetoshi Seto

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