Re: Message Signalled Interrupt support?

[David S. Miller]

   From: Matthew Wilcox <[e-mail]>
   Date: Mon, 12 May 2003 17:53:31 +0100

   On Mon, May 12, 2003 at 12:32:49PM -0400, Jeff Garzik wrote:
   > Has anybody done any work, or put any thought, into MSI support?
   
   Work -- no.  Thought?  A little.  Seems to me that MSIs need to be
   treated as a third form of interrupts (level/edge/message).

The fact that Alpha already supports them pretty much transparently
suggests that the thing to do might very well be "nothing" :-)

To be honest, MSIs are very similar to how interrupts work on sparc64,
in that each device generates a unique interrupt cookie.  The only
different is the size of this cookie, MSIs are larger than sparc64's.