From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Tristan Gingold <gingold@adacore.com>
Subject: Re: [Qemu-devel] PATCH/RFC: PCI memory mapping
Date: Thu, 2 Apr 2009 22:40:34 +0000 [thread overview]
Message-ID: <200904022340.35427.paul@codesourcery.com> (raw)
In-Reply-To: <1238684238.18745.17.camel@nibbler.dlib.indiana.edu>
On Thursday 02 April 2009, Brian Wheeler wrote:
> [first off, if there's an easier way to do this, let me know!]
>
> This patch adds an address mapping function to the PCI bus so the host
> chipset can remap PCI generated addresses to the appropriate physical
> addresses.
This should be integrated with the DMA APIs. Individual devices must not need
to be aware of bus bridges. All remapping should be handled by the DMA
routines. In principle there's no reason for this to be specific to PCI.
SPARC machines already have an IOMMU, so you should make sure your solution
also covers those systems.
I recommend looking back in the list archives, there have been several
discussions about the requirements for bus address mapping.
Paul
next prev parent reply other threads:[~2009-04-02 22:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-02 14:57 [Qemu-devel] PATCH/RFC: PCI memory mapping Brian Wheeler
2009-04-02 15:18 ` [Qemu-devel] " Tristan Gingold
2009-04-02 17:23 ` Brian Wheeler
2009-04-02 17:32 ` [Qemu-devel] " Blue Swirl
2009-04-02 17:42 ` Brian Wheeler
2009-04-02 22:40 ` Paul Brook [this message]
2009-04-03 15:05 ` Brian Wheeler
2009-04-03 15:28 ` Paul Brook
2009-04-03 16:01 ` Brian Wheeler
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