x86, VT-d: Make Intel VT-d IOMMU use IOMMU_INIT_* macros.

We utilize the IOMMU_INIT macros to create this dependency:

               [null]
                 |
       [pci_xen_swiotlb_detect]
                 |
       [pci_swiotlb_detect_override]
                 |
       [pci_swiotlb_detect_4gb]
                 |
         +-------+--------+---------------------+
        /                  \                     \
[detect_calgary]    [gart_iommu_hole_init]   [detect_intel_iommu]
                            |
                    [amd_iommu_detect]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
LKML-Reference: <1282845485-8991-10-git-send-email-konrad.wilk@oracle.com>
CC: Fujita Tomonori <fujita.tomonori@lab.ntt.co.jp>
CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: David Woodhouse <David.Woodhouse@intel.com>
CC: Len Brown <len.brown@intel.com>
CC: Chris Wright <chrisw@sous-sol.org>
CC: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

drivers/pci/dmar.c

@@ -36,6 +36,7 @@
 #include <linux/tboot.h>
 #include <linux/dmi.h>
 #include <linux/slab.h>
+#include <asm/iommu_table.h>
 
 #define PREFIX "DMAR: "
 
@@ -724,7 +725,7 @@ int __init detect_intel_iommu(void)
 	early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size);
 	dmar_tbl = NULL;
 
-	return (ret ? 1 : -ENODEV);
+	return ret ? 1 : -ENODEV;
 }
 
 
@@ -1457,3 +1458,4 @@ int __init dmar_ir_support(void)
 		return 0;
 	return dmar->flags & 0x1;
 }
+IOMMU_INIT_POST(detect_intel_iommu);