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Date: Wed, 13 Nov 2002 14:59:02 +0300
From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
To: Greg KH <greg@kroah.com>
Cc: Miles Bader <miles@gnu.org>,
       "J.E.J. Bottomley" <James.Bottomley@steeleye.com>,
       Matthew Wilcox <willy@debian.org>,
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       linux-kernel@vger.kernel.org, mochel@osdl.org,
       parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Untested port of parisc_device to generic device interface
Message-ID: <20021113145902.A1245@jurassic.park.msu.ru>
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On Tue, Nov 12, 2002 at 11:52:23PM -0800, Greg KH wrote:
> On Wed, Nov 13, 2002 at 04:46:58PM +0900, Miles Bader wrote:
> > This this would end up [or have the ability to] invoking a bus-specific
> > routine at some point, right?  [so that a truly PCI-specific definition
> > could be still be had]
> 
> If that was needed, yes, we should not break that functionality.
> 
> Are there any existing archs that need more than just dma_mask moved to
> struct device out of pci_dev?  Hm, ppc might need a bit more...

Add alpha, parisc, sparc and so on. ;-)

pci_dev->sysdata needs to be moved as well, but not only.
It seems that two things are fundamentally missing in generic
device model:
1. clean way to detect the type of container structure from arbitrary
   struct device *;
2. parent/child relationship between devices of different bus types.

Example (not exactly real life, but close enough):
to do DMA mapping properly for, say, some legacy device, I need to know
that it's sitting behind ISA-to-PCI bridge X belonging in PCI domain Y of
the root-level IO controller Z.

Ivan.
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