From: Yinghai Lu <yinghai@kernel.org>
To: Len Brown <lenb@kernel.org>, Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-acpi@vger.kernel.org
Subject: Re: [PATCH] x86: find nr_irqs_gsi with mp_ioapic_routing
Date: Fri, 06 Feb 2009 19:47:32 -0800 [thread overview]
Message-ID: <498D0454.8030401@kernel.org> (raw)
In-Reply-To: <alpine.LFD.2.00.0902062221050.26256@localhost.localdomain>
Len Brown wrote:
>
>
>> 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?
it is one AMD based system from Sun.
it has two hypertransport chains.
one: 8132 + ck804
one: io4
when 8 sockets are installed, will get
[ 0.000000] ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
[ 0.000000] IOAPIC[0]: apic_id 0, version 0, address 0xfec00000, GSI 0-23
[ 0.000000] ACPI: IOAPIC (id[0x01] address[0xfdefd000] gsi_base[48])
[ 0.000000] IOAPIC[1]: apic_id 1, version 0, address 0xfdefd000, GSI 48-54
[ 0.000000] ACPI: IOAPIC (id[0x02] address[0xfdefc000] gsi_base[56])
[ 0.000000] IOAPIC[2]: apic_id 2, version 0, address 0xfdefc000, GSI 56-62
[ 0.000000] ACPI: IOAPIC (id[0x03] address[0xfeaff000] gsi_base[24])
[ 0.000000] IOAPIC[3]: apic_id 3, version 0, address 0xfeaff000, GSI 24-47
when 2 sockets are installed, only HT chains is used. will get
[ 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
acpi madt ioapic-entries does include gsi_base field.
amd 8131: has 4 gsi
amd 8132: has 7 gsi, but only 3 can be used.
anyway that system is not broken, and it is quite solid.
this patch seems to be a 2.6.29 material.
YH
next prev parent reply other threads:[~2009-02-07 3:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-06 23:59 [PATCH] x86: find nr_irqs_gsi with mp_ioapic_routing Yinghai Lu
2009-02-07 0:00 ` [PATCH] x86/irq: optimizing nr_irqs Yinghai Lu
2009-02-08 9:44 ` [PATCH] x86/irq: optimizing nr_irqs -v2 Yinghai Lu
2009-02-09 8:14 ` Ingo Molnar
2009-02-07 3:35 ` [PATCH] x86: find nr_irqs_gsi with mp_ioapic_routing Len Brown
2009-02-07 3:47 ` Yinghai Lu [this message]
2009-02-07 7:15 ` Len Brown
2009-02-08 1:13 ` [PATCH] x86: use NR_IRQS_LEGACY to replace 16 Yinghai Lu
2009-02-09 8:14 ` Ingo Molnar
2009-02-09 8:13 ` [PATCH] x86: find nr_irqs_gsi with mp_ioapic_routing Ingo Molnar
2009-02-09 9:03 ` [PATCH] x86: find nr_irqs_gsi with mp_ioapic_routing v3 Yinghai Lu
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