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Re: Multiple MSI, take 3

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From: Eric W. Biederman <ebiederm@...>
To: David Miller <davem@...>
Cc: <benh@...>, <suresh.b.siddha@...>, <matthew@...>, <linux-pci@...>, <linux-kernel@...>, <grundler@...>, <mingo@...>, <tglx@...>, <jgarzik@...>, <linux-ide@...>, <jbarnes@...>, <rdunlap@...>, <mtk.manpages@...>
Subject: Re: Multiple MSI, take 3
Date: Sunday, July 13, 2008 - 10:03 pm

David Miller <davem@davemloft.net> writes:


To be clear I was referring to the PCI spec that describes multi-MSI
as a crap hardware design.

At the very least you are left with the problem of allocating multiple
contiguous destinations.  Which has the potential to create
fragmentation on all supported platforms.

Optional mask bits are also nasty.

My honest opinion is that the should have deprecated multi-msi after the
introduction of the msi-x specification.

Eric
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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)