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 17:55:52 +0000 [thread overview]
Message-ID: <20041026175552.GD2728@cup.hp.com> (raw)
In-Reply-To: <16759.51459.598187.91726@napali.hpl.hp.com>
On Tue, Oct 26, 2004 at 09:23:24AM -0700, Jesse Barnes wrote:
> I'm pretty sure this is the case.
Me too. (Re perf sensitive devices NOT using IO Port address space)
> In fact when I last discussed this with
> Linus he indicated that an ioread shouldn't guarantee DMA completion either,
> which would mean we could reuse the read_relaxed stuff to implement it.
How can a device driver guarantee all in-flight DMA has completed
before unmapping control data?
(ie buffers allocated with pci_alloc_consistent()).
PCI ordering rules dictate MMIO read flush in-flight inbound DMA.
I'm just looking for a replacement if there is going to be
a difference in semantics between readl() and io_readl().
thanks,
grant
next prev parent reply other threads:[~2004-10-26 17:55 UTC|newest]
Thread overview: 17+ 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 15:21 ` Linus Torvalds
2004-10-26 16:26 ` David Mosberger
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 [this message]
2004-10-26 18:05 ` Grant Grundler
2004-10-26 18:12 ` Grant Grundler
2004-10-26 18:19 ` Jesse Barnes
2004-10-26 18:37 ` Grant Grundler
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