From: Grant Grundler <iod00d@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: ia64 implementation of lib/iomap.c
Date: Tue, 26 Oct 2004 18:12:58 +0000 [thread overview]
Message-ID: <20041026181258.GH2728@cup.hp.com> (raw)
In-Reply-To: <16759.51459.598187.91726@napali.hpl.hp.com>
On Tue, Oct 26, 2004 at 10:49:07AM -0700, Jesse Barnes wrote:
> What about the relaxed read then? Should we have ioread_relaxed?
> I thought we had agreed that it was easier to assume relaxed semantics
> for ioread and add a dma_sync interface.
I would expect that requires fixing PCI drivers that depend on it.
Adding a dma_sync interface would probably make it easier to support
non-coherent (DMA and CPU caches are not coherent) platforms.
> Since PCI-X and PCI-Express have optional relaxed semantics that
> might make sense...
Jesse, you keep mixing up PCI-X Relaxed Ordering with readX() interface
and the two are NOT (directly) related.
The device driver can enable PCI-X Relaxed Ordering hints in general.
But the IO device controls "RO" hint use on individual bus transactions
it masters.
I'm not sure about PCI-Express (whole new bus protocol).
grant
next prev parent reply other threads:[~2004-10-26 18:12 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-21 14:34 ia64 implementation of lib/iomap.c David Mosberger
2004-10-21 17:34 ` Bjorn Helgaas
2004-10-21 17:38 ` David Mosberger
2004-10-25 16:48 ` Bjorn Helgaas
2004-10-26 7:48 ` David Mosberger
2004-10-26 15:21 ` Linus Torvalds
2004-10-26 16:26 ` David Mosberger
2004-10-26 16:23 ` Jesse Barnes
2004-10-26 17:06 ` Linus Torvalds
2004-10-26 17:49 ` Jesse Barnes
2004-10-26 17:55 ` Grant Grundler
2004-10-26 18:05 ` Grant Grundler
2004-10-26 18:12 ` Grant Grundler [this message]
2004-10-26 18:19 ` Jesse Barnes
2004-10-26 18:37 ` Grant Grundler
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