From: David Miller <davem@davemloft.net>
To: grundler@parisc-linux.org
Cc: abraham.manu@gmail.com, rdreier@cisco.com, greg@kroah.com,
linux-pci@atrey.karlin.mff.cuni.cz, linux-kernel@vger.kernel.org
Subject: Re: PCIE
Date: Sat, 26 May 2007 17:00:39 -0700 (PDT) [thread overview]
Message-ID: <20070526.170039.119261389.davem@davemloft.net> (raw)
In-Reply-To: <20070526235515.GA31023@colo.lackof.org>
From: Grant Grundler <grundler@parisc-linux.org>
Date: Sat, 26 May 2007 17:55:15 -0600
> MSI (and MSI-X) vectors are required to be exclusive.
> I submitted that change to pci.txt last year:
> http://lkml.org/lkml/2006/12/25/2
>
> and ISTR I've posted that bit of the PCI spec a few years ago.
> But it probably was to linux-pci mailing list only.
This requirement only extends to the PCI host controller,
how that interfaces to the cpu and it's limitations is
an entirely other matter.
> > I can imagine many systems where the cpu simply doesn't have enough
> > interrupt pins to uniquely identify every possible MSI interrupt
> > source.
>
> The cpus haven't been using interrupt pins for a long time now.
> Anything with a Local-xAPIC is already using transactions to
> signal interrupts even if the OS isn't aware of it.
I'm not talking about x86, x86_64, et al.
I'm talking about embedded ARM chips and the like, and yes they
very possibly will be using PCI-E controllers at some point.
next prev parent reply other threads:[~2007-05-27 0:00 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-23 12:15 PCIE Manu Abraham
2007-05-23 15:59 ` PCIE Greg KH
2007-05-23 20:59 ` PCIE Manu Abraham
2007-05-23 21:10 ` PCIE Roland Dreier
2007-05-23 22:11 ` PCIE Manu Abraham
2007-05-23 22:23 ` PCIE Roland Dreier
2007-05-23 23:03 ` PCIE Manu Abraham
2007-05-23 23:51 ` PCIE Roland Dreier
2007-05-24 0:07 ` PCIE Manu Abraham
2007-05-24 22:32 ` PCIE Manu Abraham
2007-05-25 3:25 ` PCIE Roland Dreier
2007-05-26 15:03 ` PCIE Manu Abraham
2007-05-26 18:28 ` PCIE Grant Grundler
2007-05-26 19:27 ` PCIE Manu Abraham
2007-05-28 1:15 ` PCIE Roland Dreier
2007-05-28 1:25 ` PCIE Manu Abraham
2007-05-28 2:04 ` PCIE Manu Abraham
2007-05-28 2:24 ` PCIE Roland Dreier
2007-05-28 2:47 ` PCIE Manu Abraham
2007-05-26 22:49 ` PCIE David Miller
2007-05-26 22:57 ` PCIE Manu Abraham
2007-05-26 23:55 ` PCIE Grant Grundler
2007-05-27 0:00 ` David Miller [this message]
2007-05-27 0:16 ` PCIE Grant Grundler
2007-05-27 0:30 ` PCIE David Miller
2007-05-27 1:01 ` PCIE Manu Abraham
2007-05-27 1:49 ` PCIE Grant Grundler
2007-05-27 20:28 ` PCIE Manu Abraham
2007-05-28 1:10 ` PCIE Roland Dreier
2007-05-27 2:34 ` PCIE H. Peter Anvin
2007-05-27 7:40 ` PCIE David Miller
2007-05-27 20:31 ` PCIE Manu Abraham
2007-05-28 1:05 ` PCIE Roland Dreier
2007-05-28 1:03 ` PCIE Roland Dreier
2007-05-28 2:54 ` PCIE David Miller
2007-05-28 4:18 ` PCIE Grant Grundler
2007-05-28 5:23 ` PCIE H. Peter Anvin
2007-05-28 5:22 ` PCIE H. Peter Anvin
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