linux-kernel - Re: tracking of PCI address space

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Message-ID: <20090408214932.GA31970@ovro.caltech.edu>
Date:	Wed, 8 Apr 2009 14:49:32 -0700
From:	Ira Snyder <iws@...o.caltech.edu>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>, linux-pci@...r.kernel.org,
	Benjamin Herrenschmidt <benh@....ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux/PPC Development <linuxppc-dev@...abs.org>
Subject: Re: tracking of PCI address space

On Wed, Apr 08, 2009 at 03:53:55PM -0500, Kumar Gala wrote:
> I was wondering if we have anything that tracks regions associated with 
> the "inbound" side of a pci_bus.
>
> What I mean is on embedded PPC we have window/mapping registers for both 
> inbound (accessing memory on the SoC) and outbound (access PCI device 
> MMIO, IO etc).  The combination of the inbound & outbound convey what 
> exists in the PCI address space vs CPU physical address space (and how to 
> map from one to the other).  Today in the PPC land we only attach 
> outbound windows to the pci_bus.  So technically the inbound side 
> information (like what subset of physical memory is visible on the PCI 
> bus) seems to be lost.
>

To the best of my knowledge there is no API to set inbound windows in
Linux. I've been implementing a virtio-over-PCI driver which needs the
inbound windows. I set them up myself during driver probe, using
get_immrbase() to get the IMMR registers. This board is a PCI Slave /
Agent, it doesn't even have PCI support compiled into the kernel.

Ira
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