On Fri, Oct 19, 2007 at 05:53:08PM -0700, David Miller wrote:
> From: [EMAIL PROTECTED] (Linas Vepstas)
> Date: Fri, 19 Oct 2007 19:46:10 -0500
>
> > FWIW, it looks like not all that many arches do this; the output
> > for grep -r address_hi * is pretty thin. Then, looking at
> > i386/kernel/io_apic.c as an example, one can see that the
> > msi state save happens "by accident" if CONFIG_SMP is enabled;
> > and so its surely broekn on uniprocesor machines.
>
> I don't see this, in all cases write_msi_msg() will transfer
> the given "*msg" to entry->msg by this assignment in
> drivers/pci/msi.c:
>
> void write_msi_msg(unsigned int irq, struct msi_msg *msg)
> {
> ...
> entry->msg = *msg;
> }
>
> So as long as write_msi_msg() is invoked, it will be saved
> properly.
As Michael Ellerman points out, the pseries msi setup is done
by firmware, and so this bit never happens.
As discussed in the other thread, I'll try to set up a patch
for an arch callback for restoring msi state.
-linas
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