- Restore the behavior of pre-allocating IDT vectors for MSI interrupts.

  This is mostly important for the multiple MSI message case where the
  IDT vectors for the entire group need to be allocated together.  This
  also restores the assumptions made by the PCI bus code that it could
  invoke PCIB_MAP_MSI() once MSI vectors were allocated.
- To avoid whiplash with CPU assignments, change the way that CPUs are
  assigned to interrupt sources on activation.  Instead of assigning the
  CPU via pic_assign_cpu() before calling enable_intr(), allow the
  different interrupt source drivers to ask the MD interrupt code which
  CPU to use when they allocate an IDT vector.  I/O APIC interrupt pins
  do this in their pic_enable_intr() routines giving the same behavior as
  before.  MSI sources do it when the IDT vectors are allocated during
  msi_alloc() and msix_alloc().
- Change the intr_table_lock from an sx lock to a mutex.

Tested by:	rnoland

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/i386/include/intr_machdep.h b/sys/i386/include/intr_machdep.h
index 4593077..052f9bd 100644
--- a/sys/i386/include/intr_machdep.h
+++ b/sys/i386/include/intr_machdep.h
@@ -139,6 +139,9 @@ int	intr_bind(u_int vector, u_char cpu);
 int	intr_config_intr(int vector, enum intr_trigger trig,
     enum intr_polarity pol);
 void	intr_execute_handlers(struct intsrc *isrc, struct trapframe *frame);
+#ifdef SMP
+u_int	intr_next_cpu(void);
+#endif
 struct intsrc *intr_lookup_source(int vector);
 int	intr_register_pic(struct pic *pic);
 int	intr_register_source(struct intsrc *isrc);