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Subject: RE: [PATCH] fix PCI interrupt setting for ia64
Date: Mon, 8 Mar 2004 15:44:16 +0800
Message-ID: <3ACA40606221794F80A5670F0AF15F8401B1A017@PDSMSX403.ccr.corp.intel.com>
Thread-Topic: [PATCH] fix PCI interrupt setting for ia64
Thread-Index: AcQE1vfzwKg8SNN1QV+SivHm8tzP3wAAoR7A
From: "Liu, Benjamin" <benjamin.liu@intel.com>
To: "Grant Grundler" <iod00d@hp.com>,
       "Kenji Kaneshige" <kaneshige.kenji@jp.fujitsu.com>
Cc: <linux-ia64@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1761
Lines: 42

Grant,

Both ISA and PCI device drivers would call arch/ia64/kernel/irq.c:request_irq()-->arch/ia64/kernel/irq.c:setup_irq() -->arch/ia64/kernel/iosapic.c:iosapic_startup_level_irq() or  arch/ia64/kernel/iosapic.c:iosapic_startup_edge_irq() function to unmask the IRQ. I believe the ISA can be handled gracefully, if any.

ISA is legacy to IA64. The configuration script of 2.4.23 has CONFIG_ISA off explicitly for IA64, 2.6.2 doesn't have this option for IA64. I just wonder whether the legacy probing method still exists on IA64.

Thanks,
Pingping (Benjamin) Liu
Intel China Software Center


>-----Original Message-----
>From: linux-ia64-owner@vger.kernel.org 
>[mailto:linux-ia64-owner@vger.kernel.org] On Behalf Of Grant Grundler
>Sent: 2004??3??8?? 14:31
>To: Kenji Kaneshige
>Cc: linux-ia64@vger.kernel.org; linux-kernel@vger.kernel.org
>Subject: Re: [PATCH] fix PCI interrupt setting for ia64
>
>
>On Mon, Mar 08, 2004 at 11:49:10AM +0900, Kenji Kaneshige wrote:
>> In ia64 kernel, IOSAPIC's RTEs for PCI interrupts are unmasked at the
>> boot time before installing device drivers. I think it is 
>very dangerous.
>
>Hi Kenji,
>I think this behavior exists to support "legacy" IRQ probing.
>I'm wondering if it would be sufficient to wrap the patch in
>"#ifndef CONFIG_ISA" or something like that.
>
>grant
>-
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