[POWERPC] MPIC MSI allocator

To support MSI on MPIC we need a way to reserve and allocate hardware irq
numbers, this patch implements an allocator for that purpose.

New firmware platforms must define a "msi-available-ranges" property on their
MPIC node for MSI to work. For U3/U4 we do a best-guess setup.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
index 22c85c4f5b29..2ffb06abe881 100644
--- a/include/asm-powerpc/mpic.h
+++ b/include/asm-powerpc/mpic.h
@@ -301,6 +301,11 @@ struct mpic
         u32                     *hw_set;
 #endif
 
+#ifdef CONFIG_PCI_MSI
+        spinlock_t              bitmap_lock;
+        unsigned long           *hwirq_bitmap;
+#endif
+
         /* link */
         struct mpic             *next;