Intel IOMMU: Intel IOMMU driver

Actual intel IOMMU driver.  Hardware spec can be found at:
http://www.intel.com/technology/virtualization

This driver sets X86_64 'dma_ops', so hook into standard DMA APIs.  In this
way, PCI driver will get virtual DMA address.  This change is transparent to
PCI drivers.

[akpm@linux-foundation.org: remove unneeded cast]
[akpm@linux-foundation.org: build fix]
[bunk@stusta.de: fix duplicate CONFIG_DMAR Makefile line]
Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 8d3e0e38ca4d..7d683dc8ed1e 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -23,7 +23,14 @@
 
 #include <linux/acpi.h>
 #include <linux/types.h>
+#include <linux/msi.h>
 
+#ifdef CONFIG_DMAR
+struct intel_iommu;
+
+/* Intel IOMMU detection and initialization functions */
+extern void detect_intel_iommu(void);
+extern int intel_iommu_init(void);
 
 extern int dmar_table_init(void);
 extern int early_dmar_detect(void);
@@ -49,4 +56,19 @@ struct dmar_rmrr_unit {
         int     devices_cnt;            /* target device count */
 };
 
+#define for_each_drhd_unit(drhd) \
+        list_for_each_entry(drhd, &dmar_drhd_units, list)
+#define for_each_rmrr_units(rmrr) \
+        list_for_each_entry(rmrr, &dmar_rmrr_units, list)
+#else
+static inline void detect_intel_iommu(void)
+{
+        return;
+}
+static inline int intel_iommu_init(void)
+{
+        return -ENODEV;
+}
+
+#endif /* !CONFIG_DMAR */
 #endif /* __DMAR_H__ */