[RFC/PATCH 14/16] MPIC MSI backend

[Michael Ellerman]

On Fri, 2007-01-26 at 10:11 +0100, Segher Boessenkool wrote:
> > MPIC MSI backend. Based on code from Segher, heavily hacked by me.
> > Renamed to mpic_htmsi, as it only deals with MSI over Hypertransport.
> 
> More exactly: it only deals with MSIs that are translated
> by some whatever-to-HT bridge into a normal HT interrupt.
> 
> > We properly discover the HT magic address by reading the config space.
> 
> ...config space of that bridge.
> 
> > Now we have an irq allocator we can support > 1 MSI, and we don't  
> > reuse
> > the LSI.
> 
> Right, that's what I asked about in the other thread, so
> the FIXME in htmsi_alloc() can indeed go.

No we don't reuse the LSI irq, so the FIXME can go.

> Why is MSI-X still unsupported?  Simply because of lack
> of testing?  (See htmsi_check()).

Yeah. There's four drivers in mainline that call pci_enable_msix(), and
I don't have hardware for any of them.

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person
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