Re: [PATCH] Introduce PCI <-> CPU address conversion [1/2]

[Matthew Wilcox <matthew@wil.cx>]

On Thu, Oct 14, 2004 at 05:37:51PM -0500, Colin Ngam wrote:
> On SGI's Altix system, the sysdata for the device is very much different than
> the sysdata for the bus.

That's fascinating, because ia64 is one of the architectures that relies
on sysdata being the same in both the bus and the device:

#define PCI_CONTROLLER(busdev) ((struct pci_controller *) busdev->sysdata)

In various places, we have
        struct pci_controller *controller = PCI_CONTROLLER(dev);
and
        if (PCI_CONTROLLER(bus)->iommu)

So what the hell does Altix do?  Which sysdata can be used to get to the
pci_controller?  This seems like a horrible mistake to me.

-- 
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he enjoys after this process of grotesque self-deception." -- Mark Twain