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Re: [PATCH] x86-64: Support for multiple MSIs

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From: Matthew Wilcox <matthew@...>
To: Kenji Kaneshige <kaneshige.kenji@...>
Cc: <linux-pci@...>, <linux-kernel@...>, <grundler@...>, <mingo@...>, <tglx@...>, <jgarzik@...>, <linux-ide@...>, <suresh.b.siddha@...>, <benh@...>, <jbarnes@...>, <rdunlap@...>, <mtk.manpages@...>, Matthew Wilcox <willy@...>
Subject: Re: [PATCH] x86-64: Support for multiple MSIs
Date: Friday, July 11, 2008 - 4:50 am

On Fri, Jul 11, 2008 at 01:50:23PM +0900, Kenji Kaneshige wrote:

I have tested the affinity code with an ICH9 AHCI:

495:     117233     117966     118033     117797   PCI-MSI-edge      ahci
496:      29860      29106      30191      28705   PCI-MSI-edge      ahci
497:          0          0          0          0   PCI-MSI-edge      ahci
498:          0          0          0          0   PCI-MSI-edge      ahci
499:          0          0          0          0   PCI-MSI-edge      ahci
500:          0          0          0          0   PCI-MSI-edge      ahci

This chip requires 16 MSIs to be registered, and it has 6 ports.
Only ports 0 and 1 have a device attached.  If I change the mask of
an active irq (eg 495 or 496), it takes effect on both of them.  If I
change the mask of an inactive irq (497-500), nothing happens.  But I
can subsequently change the mask on 495 or 496 successfully.

I can't tell you why this works this way; I haven't looked in enough
detail at the irq affinity code, but this is my observation.

Thanks for your comment.

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
--
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Messages in current thread:
Multiple MSI, take 3, Matthew Wilcox, (Thu Jul 10, 8:57 pm)
Re: Multiple MSI, take 3, Jike Song, (Fri Sep 26, 1:30 am)
Re: Multiple MSI, take 3, Matthew Wilcox, (Sat Sep 27, 3:04 pm)
Re: Multiple MSI, take 3, Eric W. Biederman, (Fri Jul 11, 6:06 am)
Re: Multiple MSI, take 3, Suresh Siddha, (Fri Jul 11, 5:59 pm)
Re: Multiple MSI, take 3, Eric W. Biederman, (Fri Jul 11, 6:59 pm)
Re: Multiple MSI, take 3, Benjamin Herrenschmidt, (Fri Jul 11, 11:52 pm)
Re: Multiple MSI, take 3, Eric W. Biederman, (Sat Jul 12, 12:41 am)
Re: Multiple MSI, take 3, Benjamin Herrenschmidt, (Sat Jul 12, 3:36 am)
Re: Multiple MSI, take 3, Eric W. Biederman, (Sun Jul 13, 6:30 pm)
Re: Multiple MSI, take 3, Benjamin Herrenschmidt, (Sun Jul 13, 6:44 pm)
Re: Multiple MSI, take 3, Eric W. Biederman, (Sun Jul 13, 7:29 pm)
Re: Multiple MSI, take 3, Benjamin Herrenschmidt, (Sun Jul 13, 8:17 pm)
Re: Multiple MSI, take 3, David Miller, (Sun Jul 13, 8:44 pm)
Re: Multiple MSI, take 3, Eric W. Biederman, (Sun Jul 13, 10:03 pm)
Re: Multiple MSI, take 3, David Miller, (Sun Jul 13, 11:19 pm)
Re: Multiple MSI, take 3, Suresh Siddha, (Fri Jul 11, 7:15 pm)
Re: Multiple MSI, take 3, Eric W. Biederman, (Fri Jul 11, 7:59 pm)
Re: Multiple MSI, take 3, Matthew Wilcox, (Fri Jul 11, 6:23 am)
Re: Multiple MSI, take 3, Eric W. Biederman, (Fri Jul 11, 7:34 am)
Re: Multiple MSI, take 3, Matthew Wilcox, (Fri Jul 11, 8:17 am)
Re: Multiple MSI, take 3, Matthew Wilcox, (Fri Jul 11, 11:10 am)
Re: Multiple MSI, take 3, Eric W. Biederman, (Fri Jul 11, 7:05 am)
Re: Multiple MSI, take 3, David Miller, (Fri Jul 11, 6:32 am)
Re: Multiple MSI, take 3, Matthew Wilcox, (Fri Jul 11, 6:41 am)
[PATCH] Rewrite MSI-HOWTO, Matthew Wilcox, (Thu Jul 10, 9:00 pm)
Re: [PATCH] Rewrite MSI-HOWTO, Grant Grundler, (Fri Sep 26, 2:42 am)
[PATCH] PCI: Add support for multiple MSI, Matthew Wilcox, (Thu Jul 10, 8:59 pm)
Re: [PATCH] PCI: Add support for multiple MSI, Hidetoshi Seto, (Fri Jul 11, 4:28 am)
Re: [PATCH] PCI: Add support for multiple MSI, Benjamin Herrenschmidt, (Fri Jul 11, 11:45 pm)
Re: [PATCH] PCI: Add support for multiple MSI, Matthew Wilcox, (Fri Jul 11, 5:45 am)
[PATCH] AHCI: Request multiple MSIs, Matthew Wilcox, (Thu Jul 10, 9:00 pm)
[PATCH] PCI MSI: Replace 'type' with 'is_msix', Matthew Wilcox, (Thu Jul 10, 8:59 pm)
[PATCH] x86-64: Support for multiple MSIs, Matthew Wilcox, (Thu Jul 10, 9:00 pm)
Re: [PATCH] x86-64: Support for multiple MSIs, Kenji Kaneshige, (Fri Jul 11, 12:50 am)
Re: [PATCH] x86-64: Support for multiple MSIs, Matthew Wilcox, (Fri Jul 11, 4:50 am)
Re: [PATCH] x86-64: Support for multiple MSIs, Kenji Kaneshige, (Sun Jul 13, 9:08 pm)