Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / dma_remapping.h

diff --git a/kernel/include/linux/dma_remapping.h b/kernel/include/linux/dma_remapping.h
new file mode 100644 (file)
index 0000000..7ac17f5
--- /dev/null
+++ b/kernel/include/linux/dma_remapping.h
@@ -0,0 +1,48 @@
+#ifndef _DMA_REMAPPING_H
+#define _DMA_REMAPPING_H
+
+/*
+ * VT-d hardware uses 4KiB page size regardless of host page size.
+ */
+#define VTD_PAGE_SHIFT         (12)
+#define VTD_PAGE_SIZE          (1UL << VTD_PAGE_SHIFT)
+#define VTD_PAGE_MASK          (((u64)-1) << VTD_PAGE_SHIFT)
+#define VTD_PAGE_ALIGN(addr)   (((addr) + VTD_PAGE_SIZE - 1) & VTD_PAGE_MASK)
+
+#define VTD_STRIDE_SHIFT        (9)
+#define VTD_STRIDE_MASK         (((u64)-1) << VTD_STRIDE_SHIFT)
+
+#define DMA_PTE_READ (1)
+#define DMA_PTE_WRITE (2)
+#define DMA_PTE_LARGE_PAGE (1 << 7)
+#define DMA_PTE_SNP (1 << 11)
+
+#define CONTEXT_TT_MULTI_LEVEL 0
+#define CONTEXT_TT_DEV_IOTLB   1
+#define CONTEXT_TT_PASS_THROUGH 2
+
+struct intel_iommu;
+struct dmar_domain;
+struct root_entry;
+
+
+#ifdef CONFIG_INTEL_IOMMU
+extern int iommu_calculate_agaw(struct intel_iommu *iommu);
+extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
+extern int dmar_disabled;
+extern int intel_iommu_enabled;
+#else
+static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
+{
+       return 0;
+}
+static inline int iommu_calculate_max_sagaw(struct intel_iommu *iommu)
+{
+       return 0;
+}
+#define dmar_disabled  (1)
+#define intel_iommu_enabled (0)
+#endif
+
+
+#endif