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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [RFC/PATCH 14/16] MPIC MSI backend
Date: Fri, 26 Jan 2007 10:11:57 +0100
To: Michael Ellerman <michael@ellerman.id.au>
Cc: Greg Kroah-Hartman <greg@kroah.com>, Kyle McMartin <kyle@parisc-linux.org>,
	linuxppc-dev@ozlabs.org, Brice Goglin <brice@myri.com>,
	shaohua.li@intel.com, linux-pci@atrey.karlin.mff.cuni.cz,
	"David S. Miller" <davem@davemloft.net>,
	"Eric W. Biederman" <ebiederm@xmission.com>
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> 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.

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

Looks good,


Segher