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/intel-iommu.c b/drivers/pci/intel-iommu.c
index 4e01df9..31fa6c9 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1088,7 +1088,7 @@
 	int i;
 	u64 addr, size;
 
-	init_iova_domain(&reserved_iova_list);
+	init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN);
 
 	/* IOAPIC ranges shouldn't be accessed by DMA */
 	iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START),
@@ -1142,7 +1142,7 @@
 	int adjust_width, agaw;
 	unsigned long sagaw;
 
-	init_iova_domain(&domain->iovad);
+	init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
 	spin_lock_init(&domain->mapping_lock);
 
 	domain_reserve_special_ranges(domain);