On Mon, 06 Jun 2005, Greg KH wrote:
>
> Ok, as it seems there is a bit of confusion, here's real code that
> should help explain what I am proposing. This works on my desktop, but
> I don't think it supports MSI :)
>
> I'll go dig out an old 4-way AMD box that has MSI to see if this still
> works properly, but comments are welcome.
Thanks for posting some sample code. Some comments though:
* What if the driver writer does not want MSI enabled for their
hardware (even though there is an MSI capabilities entry)? Reasons
include: overhead involved in initiating the MSI; no support in some
versions of firmware (QLogic hardware).
* A device (notably, our 4gb PCIe fibre-channel products) can support
both MSI and MSI-X. Since the driver has no way of 'disabling' MSI,
how would it enable MSI-X?
Thanks,
Andrew
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