linux-kernel - Re: [PATCH] x86: find nr_irqs_gsi with mp_ioapic

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Message-id: <alpine.LFD.2.00.0902062221050.26256@localhost.localdomain>
Date:	Fri, 06 Feb 2009 22:35:24 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH] x86: find nr_irqs_gsi with mp_ioapic_routing




> Impact: find right nr_irqs_gsi on some systems.
> 
> one system has gap between gsi.
> [    0.000000] ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0])
> [    0.000000] IOAPIC[0]: apic_id 4, version 0, address 0xfec00000, GSI 0-23
> [    0.000000] ACPI: IOAPIC (id[0x05] address[0xfeafd000] gsi_base[48])
> [    0.000000] IOAPIC[1]: apic_id 5, version 0, address 0xfeafd000, GSI 48-54
> [    0.000000] ACPI: IOAPIC (id[0x06] address[0xfeafc000] gsi_base[56])
> [    0.000000] IOAPIC[2]: apic_id 6, version 0, address 0xfeafc000, GSI 56-62
> ...
> [    0.000000] nr_irqs_gsi: 38

I've never seen gaps in GSIs.
I've never seen IOAPICs with 7 redirection table entries.

This system looks quite broken even before the probe for nr_irqs_gsi.
Do you have more information on it?

thanks,
-Len
--
Intel Open Source Technology Center
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