[RFC/PATCH 4/4] Add support for MSI on Axon-based Cell systems
Arnd Bergmann
arnd at arndb.de
Tue Jun 5 19:30:12 EST 2007
On Tuesday 05 June 2007, Arnd Bergmann wrote:
Sorry, I had the wrong address for Christian, resending to the right one...
> On Tuesday 05 June 2007, Jean-Christophe Dubois wrote:
> > On Monday 04 June 2007 15:00:05 Michael Ellerman wrote:
> > > + pr_debug("axon_msi: initialising ...\n");
> > > +
> > > + for_each_compatible_node(node, NULL, "ibm,axon-msic") {
> > > + if (axon_msi_setup_one(of_node_get(node)) == 0)
> > > + found++;
> > > + }
> > > + of_node_put(node);
> >
> > 2 comments:
> >
> > 1) There is no "ibm,axon-msic" compatible property in the SLOF tree provided
> > by IBM on the CAB (or other such platforms). Therefore this code will not
> > work on these platforms.
>
> Right, the firmware needs to support msi so we can use it. I guess taht's true
> for every device: If the firmware decies to hide it from us, we better don't
> try to touch it.
>
> > 2) you should somehow check for the Axon version. Axon 1.1 (and prior) are
> > know to be loosing MSI/MBX interrupts (but not the data part associated to
> > them). Therefore this should be enabled only on Axon 2.1 (or later).
>
> Good point, thanks for mentioning it. Christian, can you confirm that the
> ibm,axon-msic node is only created on systems with axon 2.1 or later?
>
> Arnd <><
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