From: jbarnes@sgi.com (Jesse Barnes)
To: Matthew Wilcox <willy@debian.org>
Cc: linux-pci@atrey.karlin.mff.cuni.cz, linux-kernel@vger.kernel.org,
jeremy@sgi.com
Subject: Re: [RFC] Relaxed PIO read vs. DMA write ordering
Date: Wed, 7 Jan 2004 14:58:38 -0800 [thread overview]
Message-ID: <20040107225838.GA6837@sgi.com> (raw)
In-Reply-To: <20040107190206.GK17182@parcelfarce.linux.theplanet.co.uk>
On Wed, Jan 07, 2004 at 07:02:06PM +0000, Matthew Wilcox wrote:
> So we want a pci_set_relaxed() macro / function() to set this bit
> (otherwise dozens of drivers will start to try to set the bit themselves,
> badly). If this bit *isn't* set, setting the bit in the transaction will have
> no effect, right?
Right, we'd want that call too. And actually, if the bit in the command
word isn't set, we're not allowed to set it in individual transactions.
> How about always setting the bit in readb() and having a readb_ordered()
> which doesn't set the bit in the transaction? That way, drivers which
> call pci_set_relaxed() have the responsibility to verify they're not
> relying on these semantics and use readb_ordered() in any places that
> they are.
Yep, that would work too.
Jesse
prev parent reply other threads:[~2004-01-07 22:58 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
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 [this message]
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