Re: [PATCH 2/2] Initial generic hypertransport interrupt support.

[Dave Olson <olson@pathscale.com>]

On Thu, 13 Jul 2006, Eric W. Biederman wrote:
| > There's really nothing special at all about the interrupt
| > setup, except in one very minor way.   The value of the HT interrupt
| > destination address needs to be copied from HT config space, to
| > an internal chip register (which is, can, and should be, handled by
| > the driver init code).
| 
| The kernel changes the value at runtime, based upon user input.
| I assume your mirror register needs to be updated after every change.

Yes.  If the interrupt address changes, then we need a callback.

| Since the kernel changes the value at runtime, and since a different
| register needs to be written to, I can't quite use the generic code I
| have written as is.  

I imagine at least some other drivers would like to know when their interrupt
configuration changes, also, so an interface where a driver can register
a callback handler seems like the right generic answer, or more simply,
a way for a driver to say it doesn't want it's interrupt handler
migrated (which we would like anyway, for performance reasons).

Dave Olson
dave.olson@qlogic.com