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From: Jochen Friedrich <jochen@scram.de>
To: Jesse Barnes <jbarnes@sgi.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: Fri, 9 Jan 2004 08:39:28 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.58.0401090833480.4454@localhost> (raw)
In-Reply-To: <20040108173655.GA11168@sgi.com>

Hi Jesse,

> > BTW, Jesse, did you look at part II of Documentation/DMA-ABI.txt?
>
> I remember seeing discussion of the new API, but haven't read that doc
> yet.  Since most drivers still use the pci_* API, we'd have to add a
> call there, but we may as well make the two APIs as similar as possible
> right?

And there are reasons for drivers still using the pci_* API. In tms380tr,
i support both PCI and ISA cards. The pci_* API supports mapping ISA cards
for bus master DMA by passing a NULL for pdev. The new API still fails
because of the BUG_ON(dev->bus != &pci_bus_type). Unfortunately, on 64 bit
platforms like Alpha, the mapping is required to set up the IOMMU.

--jochen

  parent reply	other threads:[~2004-01-09  7:41 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 [this message]
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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