From: Roland Dreier <rdreier@cisco.com>
To: Matthew Wilcox <matthew@wil.cx>, John Partridge <johnip@sgi.com>
Cc: "Richard B. Johnson" <jmodem@AbominableFirebug.com>,
"Michael S. Tsirkin" <mst@mellanox.co.il>,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org,
jeff@garzik.org, openib-general@openib.org,
linux-pci@atrey.karlin.mff.cuni.cz,
David Miller <davem@davemloft.net>
Subject: Re: Ordering between PCI config space writes and MMIO reads?
Date: Tue, 31 Oct 2006 14:30:13 -0800 [thread overview]
Message-ID: <ada4ptkt8y2.fsf@cisco.com> (raw)
In-Reply-To: <20061031204717.GG26964@parisc-linux.org> (Matthew Wilcox's message of "Tue, 31 Oct 2006 13:47:17 -0700")
> I'm beginning to think Michael Tsirkin has the only solution to this
> -- architectures need to check that their hardware blocks until the
> config write completion has occurred (and if not, simulate that it has
> in software).
OK, I guess I'm convinced. The vague language in the base PCI 3.0
spec about "dependencies" made me think that a read of a config
register had to wait until all previous writes to the same register
are done. So I'll drop this patch for now.
John, you'll need to try and come up with a way to solve this in the
Altix implementation of pci_write_config_xxx().
- R.
next prev parent reply other threads:[~2006-10-31 22:30 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-24 19:13 Ordering between PCI config space writes and MMIO reads? Roland Dreier
2006-10-24 19:22 ` Jeff Garzik
2006-10-24 21:47 ` Matthew Wilcox
2006-10-24 21:51 ` Roland Dreier
2006-10-24 22:12 ` John Partridge
2006-10-24 22:36 ` Matthew Wilcox
2006-10-24 22:43 ` David Miller
2006-10-25 14:15 ` Roland Dreier
2006-10-31 19:02 ` Roland Dreier
2006-10-31 19:53 ` Michael S. Tsirkin
2006-10-31 19:53 ` Roland Dreier
2006-10-31 19:58 ` Matthew Wilcox
2006-10-31 20:28 ` Michael S. Tsirkin
2006-10-31 20:34 ` Richard B. Johnson
2006-10-31 20:47 ` Matthew Wilcox
2006-10-31 22:30 ` Roland Dreier [this message]
2006-11-01 16:27 ` John Partridge
2006-11-01 16:46 ` Matthew Wilcox
2006-11-01 17:08 ` John Partridge
2006-11-01 17:14 ` Matthew Wilcox
2006-11-01 23:04 ` David Miller
2006-11-02 1:08 ` John Partridge
2006-10-31 20:50 ` Michael S. Tsirkin
2006-10-24 22:59 ` [openib-general] " Jason Gunthorpe
2006-10-25 14:04 ` Roland Dreier
2006-10-24 23:09 ` Michael S. Tsirkin
2006-10-24 23:27 ` Jack Steiner
2006-10-25 14:05 ` Roland Dreier
2006-11-02 3:05 ` Jeremy Higdon
2006-10-24 21:01 ` [openib-general] " JWM
2006-10-24 21:24 ` Alan Cox
2006-10-24 21:29 ` Roland Dreier
2006-10-24 21:37 ` Jeff Garzik
2006-10-25 6:30 ` Grant Grundler
2006-10-25 14:11 ` Roland Dreier
2006-10-25 14:18 ` Matthew Wilcox
2006-10-25 17:15 ` [openib-general] " Jason Gunthorpe
2006-10-25 18:22 ` Michael S. Tsirkin
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