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

[Arnd Bergmann]

On Tuesday 15 January 2013, Thierry Reding wrote:
> I'm not sure I follow you're reasoning here. Is it possible to use MSIs
> without PCI? If not then I think there's little sense in keeping the
> implementations separate.

Conceptually, you can use MSI for any device, but the Linux interfaces
for MSI are tied to PCI. If you use an MSI controller for a non-PCI
device, it would probably just appear as a regular interrupt controller.

> Furthermore, if MSI controller and PCI host bridge are separate entities
> how do you look up the MSI controller given a PCI device?

The host bridge can contain a pointer ot the MSI controller. You can
have multiple host bridges sharing a single MSI controller or you
can have separate ones for each host.

	Arnd
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