Date: Tue, 21 Oct 2003 16:42:30 -0600 From: Scott Long <scottl@freebsd.org> To: Eric Anholt <eta@lclark.edu> Cc: current@freebsd.org Subject: Re: PCI domains? Message-ID: <3F95B656.50102@freebsd.org> In-Reply-To: <1066772724.646.62.camel@leguin>
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Eric Anholt wrote: > Is there any concept of PCI domains in the kernel? > > This is for the DRM, while dealing with a complaint from Linus recently: > > >>Please fix the fact that modern PCI is _not_ enumerated with just "bus, >>slot, function". A lot of machines are starting to have a "domain number", >>which allows fro multiple independent PCI subsystems in the same machine. >> >>On linux, you can use "pci_name(pdev)" to get a truly unique descriptor of >>the device (within the PCI subsystem). It will look something like >> >> 0000:00:02.0 >> >>for "domain 0, bus 0, device 2, function 0". > > > We don't have much of a concept of this (except possibly Alpha like John mentioned, but I really cannot comment on that). Supporting it wouldn't be terribly magical on our end until we fix busdma to support device-device transfers. Since I don't know much context on the DRM side, what exactly is Linus asking to change, and do we need to worry about it? Scotthome | help
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