Merge phase #3 (IOMMU) of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-v28-for-linus-phase3-B' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (74 commits)
  AMD IOMMU: use iommu_device_max_index, fix
  AMD IOMMU: use iommu_device_max_index
  x86: add PCI IDs for AMD Barcelona PCI devices
  x86/iommu: use __GFP_ZERO instead of memset for GART
  x86/iommu: convert GART need_flush to bool
  x86/iommu: make GART driver checkpatch clean
  x86 gart: remove unnecessary initialization
  x86: restore old GART alloc_coherent behavior
  revert "x86: make GART to respect device's dma_mask about virtual mappings"
  x86: export pci-nommu's alloc_coherent
  iommu: remove fullflush and nofullflush in IOMMU generic option
  x86: remove set_bit_string()
  iommu: export iommu_area_reserve helper function
  AMD IOMMU: use coherent_dma_mask in alloc_coherent
  add AMD IOMMU tree to MAINTAINERS file
  AMD IOMMU: use cmd_buf_size when freeing the command buffer
  AMD IOMMU: calculate IVHD size with a function
  AMD IOMMU: remove unnecessary cast to u64 in the init code
  AMD IOMMU: free domain bitmap with its allocation order
  AMD IOMMU: simplify dma_mask_to_pages
  ...

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 952e0f857ac9..ba9114ec5d3a 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -48,6 +48,11 @@ static inline int is_device_dma_capable(struct device *dev)
         return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
 }
 
+static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
+{
+        return addr + size <= mask;
+}
+
 #ifdef CONFIG_HAS_DMA
 #include <asm/dma-mapping.h>
 #else
@@ -58,6 +63,13 @@ static inline int is_device_dma_capable(struct device *dev)
 #define dma_sync_single         dma_sync_single_for_cpu
 #define dma_sync_sg             dma_sync_sg_for_cpu
 
+static inline u64 dma_get_mask(struct device *dev)
+{
+        if (dev && dev->dma_mask && *dev->dma_mask)
+                return *dev->dma_mask;
+        return DMA_32BIT_MASK;
+}
+
 extern u64 dma_get_required_mask(struct device *dev);
 
 static inline unsigned int dma_get_max_seg_size(struct device *dev)