From: Roland Dreier <rdreier@cisco.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Miller <davem@davemloft.net>,
torvalds@osdl.org, jeff@garzik.org, linux-kernel@vger.kernel.org,
tiwai@suse.de
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default
Date: Tue, 14 Nov 2006 20:23:39 -0800 [thread overview]
Message-ID: <adahcx1z6b8.fsf@cisco.com> (raw)
In-Reply-To: <1163563260.5940.205.camel@localhost.localdomain> (Benjamin Herrenschmidt's message of "Wed, 15 Nov 2006 15:01:00 +1100")
> Out of curiosity. Are you sure there is no case of stupid bridge
> converting the MSI into some APIC/whatever interrupt for the CPU
> potentially before all previous DMA have been fully pushed to the
> coherent domain (still in some internal store queue for example) ?
That's forbidden by the PCI spec:
"An MSI or MSI-X message, by virtue of being a posted memory write
(PMW) transaction, is prohibited by PCI ordering rules from
passing PMW transactions sent earlier by the function. The system
must guarantee that an interrupt service routine invoked as a
result of a given message will observe any updates performed by
PMW transactions arriving prior to that message."
which is not to say that there are no chipsets with errata in this
area. But I've never heard of such a thing...
- R.
next prev parent reply other threads:[~2006-11-15 4:23 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200611150059.kAF0xBTl009796@hera.kernel.org>
2006-11-15 1:34 ` [PATCH] ALSA: hda-intel - Disable MSI support by default Jeff Garzik
2006-11-15 1:55 ` Linus Torvalds
2006-11-15 2:40 ` Jeff Garzik
2006-11-15 2:49 ` Linus Torvalds
2006-11-15 3:00 ` David Miller
2006-11-15 3:10 ` Linus Torvalds
2006-11-15 3:21 ` David Miller
2006-11-15 3:54 ` Linus Torvalds
2006-11-15 4:11 ` Jeff Garzik
2006-11-15 4:15 ` David Miller
2006-11-15 4:24 ` Jeff Garzik
2006-11-15 4:28 ` David Miller
2006-11-16 2:25 ` Benjamin Herrenschmidt
2006-11-16 2:28 ` Benjamin Herrenschmidt
2006-11-16 3:25 ` Jeff Garzik
2006-11-16 4:12 ` Benjamin Herrenschmidt
2006-11-16 6:13 ` Jeff Garzik
2006-11-16 14:41 ` Krzysztof Halasa
2006-11-16 15:27 ` Jeff Garzik
2006-11-16 17:24 ` Roland Dreier
2006-11-15 19:09 ` Stephen Hemminger
2006-11-15 19:23 ` Jeff Garzik
2006-11-15 19:49 ` Stephen Hemminger
2006-11-15 22:31 ` Roland Dreier
2006-11-16 2:24 ` Benjamin Herrenschmidt
2006-11-15 4:30 ` Roland Dreier
2006-11-15 4:56 ` Jeff Garzik
2006-11-15 15:53 ` Linus Torvalds
2006-11-15 18:30 ` Jeff Garzik
2006-11-15 18:45 ` Roland Dreier
2006-11-16 2:29 ` Benjamin Herrenschmidt
2006-11-15 13:34 ` Krzysztof Halasa
2006-11-15 18:42 ` Jeff Garzik
2006-11-15 19:04 ` Linus Torvalds
2006-11-15 19:20 ` Jeff Garzik
2006-11-15 19:35 ` Linus Torvalds
2006-11-15 19:59 ` Mws
2006-11-15 20:14 ` Linus Torvalds
2006-11-15 20:53 ` Olivier Nicolas
2006-11-16 6:08 ` Yinghai Lu
2006-11-16 23:25 ` Olivier Nicolas
2006-11-15 21:10 ` Mws
2006-11-16 11:10 ` Mws
2006-11-15 4:14 ` Roland Dreier
2006-11-15 4:49 ` Andi Kleen
2006-11-15 4:57 ` Roland Dreier
2006-11-15 5:11 ` Andi Kleen
2006-11-15 22:43 ` Roland Dreier
2006-11-15 18:35 ` [PATCH] ACPI: use MSI_NOT_SUPPORTED bit Randy Dunlap
2006-11-15 18:44 ` Andi Kleen
2006-11-15 19:41 ` [PATCH v2] " Randy Dunlap
2006-11-15 19:58 ` [PATCH v3] " Randy Dunlap
2006-11-15 20:19 ` [PATCH] " Len Brown
2006-11-16 2:22 ` [PATCH] ALSA: hda-intel - Disable MSI support by default Benjamin Herrenschmidt
2006-11-15 10:31 ` Takashi Iwai
2006-11-15 16:19 ` Linus Torvalds
2006-11-15 16:24 ` Arjan van de Ven
2006-11-15 16:36 ` Linus Torvalds
2006-11-15 18:40 ` Jeff Garzik
2006-11-15 18:51 ` Linus Torvalds
2006-11-15 19:01 ` Arjan van de Ven
2006-11-15 19:34 ` Stephen Clark
2006-11-15 19:48 ` Jeff Garzik
2006-11-15 20:01 ` Stephen Clark
2006-11-15 18:32 ` Jeff Garzik
2006-11-15 18:32 ` Jeff Garzik
2006-11-15 18:58 ` Takashi Iwai
2006-11-15 19:15 ` Jeff Garzik
2006-11-16 10:44 ` Takashi Iwai
2006-11-16 23:01 ` Olivier Nicolas
2006-11-17 10:55 ` Takashi Iwai
2006-11-17 16:17 ` Yinghai Lu
2006-11-17 16:35 ` Linus Torvalds
2006-11-15 19:20 ` Stephen Hemminger
2006-11-15 22:35 ` Roland Dreier
2006-11-15 4:01 ` Benjamin Herrenschmidt
2006-11-15 4:07 ` David Miller
2006-11-15 7:23 ` Benjamin Herrenschmidt
2006-11-15 10:06 ` Segher Boessenkool
2006-11-15 4:23 ` Roland Dreier [this message]
2006-11-15 7:24 ` Benjamin Herrenschmidt
2006-11-15 4:04 ` Benjamin Herrenschmidt
2006-11-15 4:14 ` Jeff Garzik
2006-11-15 4:24 ` Roland Dreier
2006-11-15 2:58 ` Randy Dunlap
2006-11-15 3:10 ` D. Hazelton
2006-11-15 3:30 ` Jeff Garzik
2006-11-15 3:53 ` D. Hazelton
2006-11-15 11:40 ` Alan
2006-11-16 4:06 ` D. Hazelton
2006-11-16 0:17 Lu, Yinghai
-- strict thread matches above, loose matches on Subject: below --
2006-11-16 3:50 Lu, Yinghai
2006-11-16 23:36 ` Olivier Nicolas
2006-11-16 4:24 linux
2006-11-16 10:53 ` Alan
2006-11-16 16:05 ` Linus Torvalds
2006-11-16 4:25 Lu, Yinghai
2006-11-16 18:00 ` D. Hazelton
2006-11-16 23:54 Lu, Yinghai
2006-11-17 0:49 ` Olivier Nicolas
2006-11-17 17:42 Lu, Yinghai
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