Add preliminary support for binding interrupts to CPUs:

- Add a new intr_event method ie_assign_cpu() that is invoked when the MI
  code wishes to bind an interrupt source to an individual CPU.  The MD
  code may reject the binding with an error.  If an assign_cpu function
  is not provided, then the kernel assumes the platform does not support
  binding interrupts to CPUs and fails all requests to do so.
- Bind ithreads to CPUs on their next execution loop once an interrupt
  event is bound to a CPU.  Only shared ithreads are bound.  We currently
  leave private ithreads for drivers using filters + ithreads in the
  INTR_FILTER case unbound.
- A new intr_event_bind() routine is used to bind an interrupt event to
  a CPU.
- Implement binding on amd64 and i386 by way of the existing pic_assign_cpu
  PIC method.
- For x86, provide a 'intr_bind(IRQ, cpu)' wrapper routine that looks up
  an interrupt source and binds its interrupt event to the specified CPU.
  MI code can currently (ab)use this by doing:

	intr_bind(rman_get_start(irq_res), cpu);

  however, I plan to add a truly MI interface (probably a bus_bind_intr(9))
  where the implementation in the x86 nexus(4) driver would end up calling
  intr_bind() internally.

Requested by:	kmacy, gallatin, jeff
Tested on:	{amd64, i386} x {regular, INTR_FILTER}

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/arm/arm/intr.c b/sys/arm/arm/intr.c
index c991220..fbaa96c 100644
--- a/sys/arm/arm/intr.c
+++ b/sys/arm/arm/intr.c
@@ -92,10 +92,10 @@ arm_setup_irqhandler(const char *name, driver_filter_t *filt,
 #ifdef INTR_FILTER
 		error = intr_event_create(&event, (void *)irq, 0,
 		    (void (*)(void *))arm_unmask_irq, intr_eoi_src,
-		    intr_disab_eoi_src, "intr%d:", irq);
+		    intr_disab_eoi_src, NULL, "intr%d:", irq);
 #else
 		error = intr_event_create(&event, (void *)irq, 0,
-		    (void (*)(void *))arm_unmask_irq, "intr%d:", irq);
+		    (void (*)(void *))arm_unmask_irq, NULL, "intr%d:", irq);
 #endif
 		if (error)
 			return;