From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: David Miller <davem@davemloft.net>
Cc: torvalds@linux-foundation.org, hancockr@shaw.ca,
galibert@pobox.com, linux-kernel@vger.kernel.org, ak@suse.de,
cebbert@redhat.com, lenb@kernel.org
Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources
Date: Wed, 23 May 2007 16:11:17 -0700 [thread overview]
Message-ID: <200705231611.18944.jbarnes@virtuousgeek.org> (raw)
In-Reply-To: <20070523.160415.26274543.davem@davemloft.net>
On Wednesday, May 23, 2007 4:04 pm David Miller wrote:
> From: Linus Torvalds <torvalds@linux-foundation.org>
> Date: Wed, 23 May 2007 15:16:23 -0700 (PDT)
>
> > That crap should be seen for the crap it is! Dammit, how hard can
> > it be to just admit that mmconfig isn't that great?
>
> I knew mmconfig was broken conceptually the first time I started
> seeing write posting "bug fixes" for it that would do a read back
> from PCI config space via mmconfig to post the write, which of course
> has potential side-effects on the device and is absolutely illegal if
> the write just performed put the device into a PM state or whatever.
I've actually seen that specific form of posted write flushing cause
crashes on some machines, so yes, it sucks.
Unfortunately, I don't think we have any other way of getting at
extended config space on x86, unless EFI provides methods or something,
but I'm not sure that would be an improvement...
Jesse
next prev parent reply other threads:[~2007-05-23 23:11 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-30 2:14 [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources Robert Hancock
2007-04-30 2:59 ` Randy Dunlap
2007-04-30 22:59 ` Olivier Galibert
2007-04-30 23:26 ` Robert Hancock
2007-05-01 16:48 ` Jesse Barnes
2007-05-02 2:41 ` Jesse Barnes
2007-05-02 2:56 ` Jesse Barnes
2007-05-02 5:27 ` Jesse Barnes
2007-05-02 14:34 ` Robert Hancock
2007-05-02 17:57 ` Jesse Barnes
2007-05-02 23:45 ` Robert Hancock
2007-05-02 23:54 ` Jesse Barnes
2007-05-04 21:06 ` Jesse Barnes
2007-05-05 0:22 ` Robert Hancock
2007-05-21 19:10 ` Jesse Barnes
2007-05-21 19:26 ` Robert Hancock
2007-05-21 20:07 ` Jesse Barnes
2007-05-21 20:22 ` Jesse Barnes
2007-05-23 0:31 ` Robert Hancock
2007-05-23 0:38 ` Jesse Barnes
2007-05-23 0:53 ` Robert Hancock
2007-05-23 0:56 ` Jesse Barnes
2007-05-23 1:06 ` Robert Hancock
2007-05-23 18:52 ` Jesse Barnes
2007-05-23 20:20 ` Linus Torvalds
2007-05-23 20:38 ` Alan Cox
2007-05-23 20:45 ` Linus Torvalds
2007-05-23 20:49 ` Jesse Barnes
2007-05-23 20:56 ` Linus Torvalds
2007-05-23 21:03 ` Jesse Barnes
2007-05-23 21:09 ` Jeff Garzik
2007-05-23 21:35 ` Alan Cox
2007-05-23 21:35 ` Jeff Garzik
2007-05-23 21:37 ` Jesse Barnes
2007-05-23 21:42 ` Jeff Garzik
2007-05-23 23:07 ` Stephen Hemminger
2007-05-23 21:54 ` Linus Torvalds
2007-05-23 22:06 ` Jesse Barnes
2007-05-23 22:16 ` Linus Torvalds
2007-05-23 22:28 ` Jesse Barnes
2007-05-23 23:04 ` David Miller
2007-05-23 23:11 ` Jesse Barnes [this message]
2007-05-23 23:15 ` Robert Hancock
2007-05-23 23:21 ` Jesse Barnes
2007-05-23 21:20 ` Jesse Barnes
2007-05-23 22:24 ` Olivier Galibert
2007-05-23 22:31 ` Jesse Barnes
2007-05-23 22:48 ` Linus Torvalds
2007-05-23 22:55 ` Jesse Barnes
2007-05-24 0:21 ` Linus Torvalds
2007-05-24 2:59 ` Jesse Barnes
2007-05-24 3:18 ` Linus Torvalds
2007-05-24 3:20 ` Linus Torvalds
2007-05-24 3:40 ` Jesse Barnes
2007-05-24 5:19 ` Robert Hancock
2007-05-24 6:18 ` Jeff Garzik
2007-05-24 15:42 ` Linus Torvalds
2007-05-23 23:04 ` Robert Hancock
2007-05-23 23:04 ` Robert Hancock
2007-05-23 23:06 ` Jesse Barnes
2007-05-24 0:02 ` Jesse Barnes
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