linux-kernel - Re: [PATCH 10/14] PCI: tegra: Move PCIe driver to drivers/pci/host

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Date:	Sun, 13 Jan 2013 10:58:06 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	linux-tegra@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <linux@....linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andrew Murray <andrew.murray@....com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 10/14] PCI: tegra: Move PCIe driver to drivers/pci/host

On Sat, Jan 12, 2013 at 09:12:25PM +0000, Arnd Bergmann wrote:
> On Saturday 12 January 2013, Thierry Reding wrote:
> > > I already hinted at that in one of the other subthreads. Having such a
> > > multiplex would also allow the driver to be built as a module. I had
> > > already thought about this when I was working on an earlier version of
> > > these patches. Basically these would be two ops attached to the host
> > > bridge, and the generic arch_setup_msi_irq() could then look that up
> > > given the struct pci_dev that is passed to it and call this new per-
> > > host bridge .setup_msi_irq().
> > 
> > struct pci_ops looks like a good place to put these. They'll be
> > available from each struct pci_bus, so should be easy to call from
> > arch_setup_msi_irq().
> > 
> > Any objections?
> > 
> 
> struct pci_ops has a long history of being specifically about
> config space read/write operations, so on the one hand it does
> not feel like the right place to put interrupt specific operations,
> but on the other hand, the name sounds appropriate and I cannot
> think of any other place to put this, so it's fine with me.
> 
> The only alternative I can think of is to introduce a new
> structure next to it in struct pci_bus, but that feels a bit
> pointless. Maybe Bjorn has a preference one way or the other.

The name pci_ops is certainly generic enough. Also the comment above the
structure declaration says "Low-level architecture-dependent routines",
which applies to the MSI functions as well.

Thierry

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