Date: Fri, 9 Jan 2004 13:27:18 -0700
From: Grant Grundler <grundler@parisc-linux.org>
To: Jochen Friedrich <jochen@scram.de>
Cc: Jesse Barnes <jbarnes@sgi.com>, linux-kernel@vger.kernel.org,
       jeremy@sgi.com, linux-pci@atrey.karlin.mff.cuni.cz,
       Jame.Bottomley@steeleye.com
Subject: Re: [RFC] Relaxed PIO read vs. DMA write ordering
Message-ID: <20040109202718.GB14165@colo.lackof.org>
References: <20040107175801.GA4642@sgi.com> <20040107190206.GK17182@parcelfarce.linux.theplanet.co.uk> <20040107222142.GB14951@colo.lackof.org> <20040107230712.GB6837@sgi.com> <20040108063829.GC22317@colo.lackof.org> <20040108173655.GA11168@sgi.com> <Pine.LNX.4.58.0401090833480.4454@localhost>
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On Fri, Jan 09, 2004 at 08:39:28AM +0100, Jochen Friedrich wrote:
> 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).

I don't think that's a problem of API, rather the implementation.

>  Unfortunately, on 64 bit
> platforms like Alpha, the mapping is required to set up the IOMMU.

Not just alpha.
ia64, parisc, x86_64, sparc64, mips, (and a few others) also have IO MMUs.

grant
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