x64, x2apic/intr-remap: Interrupt remapping infrastructure

Interrupt remapping (part of Intel Virtualization Tech for directed I/O)
infrastructure.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: akpm@linux-foundation.org
Cc: arjan@linux.intel.com
Cc: andi@firstfloor.org
Cc: ebiederm@xmission.com
Cc: jbarnes@virtuousgeek.org
Cc: steiner@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index aba151ca6d26..23a119e6485e 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -449,6 +449,22 @@ int __init early_dmar_detect(void)
         return (ACPI_SUCCESS(status) ? 1 : 0);
 }
 
+void __init detect_intel_iommu(void)
+{
+        int ret;
+
+        ret = early_dmar_detect();
+
+#ifdef CONFIG_DMAR
+        {
+                if (ret && !no_iommu && !iommu_detected && !swiotlb &&
+                    !dmar_disabled)
+                        iommu_detected = 1;
+        }
+#endif
+}
+
+
 int alloc_iommu(struct dmar_drhd_unit *drhd)
 {
         struct intel_iommu *iommu;