linux-kernel - Re: A set of "standard" virtual devices?

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Date:	Tue, 3 Apr 2007 18:07:43 +0200
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>, Andi Kleen <ak@...e.de>,
	Jeff Garzik <jeff@...zik.org>,
	virtualization@...ts.linux-foundation.org,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mathiasen@...il.com
Subject: Re: A set of "standard" virtual devices?

On Tue, 3 Apr 2007 16:03:14 +0200,
Arnd Bergmann <arnd@...db.de> wrote:

> > > struct virt_dev {
> > > 	struct device dev;
> > > 	struct virt_driver *driver;
> > > 	struct virt_bus *bus;
> > > 	struct pci_device_id id;
> > > 	int irq;
> > > };
> > 
> > And that's where I have problems :) The notion of "irq" is far too
> > platform specific. I can bend my mind round using PCI-like ids for
> > non-PCI virtualized devices, but an integer is far too small and to
> > specific for a way to access the device.
> 
> Sorry, I've been working too long on the lesser architectures.
> IRQ number are evil indeed.
> However, I'm pretty sure that we need _some_ abstraction of an
> interrupt mechanism here. The easiest way is probably to have a
> callback function like
> 	int (*irq_handler)(struct virt_dev*, unsigned long message);
> in the virt_dev.

Yes, something like
	int (*handler) (struct virt_dev *, struct virt_interrupt_info *);
should cover the needed cases.
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