Genericizing iova.[ch]

I would like to potentially move the sparc64 IOMMU code over to using
the nice new drivers/pci/iova.[ch] code for free area management..

In order to do that we have to detach the IOMMU page size assumptions
which only really need to exist in the intel-iommu.[ch] code.

This patch attempts to implement that.

[akpm@linux-foundation.org: build fix]
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 91b2dc9..8ed2648 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -26,6 +26,7 @@
 #include <linux/pci.h>
 #include <linux/dmar.h>
 #include "iova.h"
+#include "intel-iommu.h"
 
 #undef PREFIX
 #define PREFIX "DMAR:"