From: jbarnes@sgi.com (Jesse Barnes)
To: Leonid Grossman <leonid.grossman@s2io.com>
Cc: "'Grant Grundler'" <grundler@parisc-linux.org>,
linux-kernel@vger.kernel.org, jeremy@sgi.com,
"'Matthew Wilcox'" <willy@debian.org>,
linux-pci@atrey.karlin.mff.cuni.cz, Jame.Bottomley@steeleye.com
Subject: Re: [RFC] Relaxed PIO read vs. DMA write ordering
Date: Thu, 8 Jan 2004 09:39:49 -0800 [thread overview]
Message-ID: <20040108173949.GB11168@sgi.com> (raw)
In-Reply-To: <005b01c3d603$d01b6c90$0400a8c0@S2IOtech.com>
On Thu, Jan 08, 2004 at 08:23:49AM -0800, Leonid Grossman wrote:
> > I interpret this to mean:
> > Setting the RO bit in the PCI-X Command Register only enables
> > the device to choose when to set RO Attribute bit when the device
> > generates a PCI-X bus cycle.
>
> Yes, this is exactly how (at least our 10GbE) PCI-X ASICs work.
> If the RO bit is set, the device decides whether the transaction
> requires strong ordering,
> and sets RO attribute accordingly.
Excellent, a card in the wild that actually does this! :) Ok, now I'll
take of my sn2 tunnel vision glasses--we don't want another readX
variant, but it sounds like we'll need pcix_enable_relaxed() _and_
pci_sync_consistent() to support non-coherent platforms well. How does
that sound?
Thanks,
Jesse
next prev parent reply other threads:[~2004-01-08 17:43 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-07 17:58 [RFC] Relaxed PIO read vs. DMA write ordering Jesse Barnes
2004-01-07 19:02 ` Matthew Wilcox
2004-01-07 22:21 ` Grant Grundler
2004-01-07 23:07 ` Jesse Barnes
2004-01-07 23:27 ` Greg KH
2004-01-07 23:56 ` Jesse Barnes
2004-01-08 0:34 ` Jesse Barnes
2004-01-08 0:08 ` Jeremy Higdon
2004-01-08 10:01 ` Jes Sorensen
2004-01-08 6:38 ` Grant Grundler
2004-01-08 16:23 ` Leonid Grossman
2004-01-08 17:39 ` Jesse Barnes [this message]
2004-01-08 17:54 ` Christoph Hellwig
2004-01-08 19:48 ` Leonid Grossman
2004-01-08 17:36 ` Jesse Barnes
2004-01-08 18:44 ` Grant Grundler
2004-01-09 7:13 ` Jeremy Higdon
2004-01-09 19:51 ` Jesse Barnes
2004-01-09 23:15 ` Jesse Barnes
2004-01-09 20:02 ` Grant Grundler
2004-01-11 14:34 ` James Bottomley
2004-01-09 7:39 ` Jochen Friedrich
2004-01-09 20:27 ` Grant Grundler
2004-01-09 22:12 ` Ivan Kokshaysky
2004-01-07 22:58 ` Jesse Barnes
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