Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / iommu-helper.h

diff --git a/kernel/include/linux/iommu-helper.h b/kernel/include/linux/iommu-helper.h
new file mode 100644 (file)
index 0000000..86bdeff
--- /dev/null
+++ b/kernel/include/linux/iommu-helper.h
@@ -0,0 +1,34 @@
+#ifndef _LINUX_IOMMU_HELPER_H
+#define _LINUX_IOMMU_HELPER_H
+
+#include <linux/kernel.h>
+
+static inline unsigned long iommu_device_max_index(unsigned long size,
+                                                  unsigned long offset,
+                                                  u64 dma_mask)
+{
+       if (size + offset > dma_mask)
+               return dma_mask - offset + 1;
+       else
+               return size;
+}
+
+extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
+                                 unsigned long shift,
+                                 unsigned long boundary_size);
+extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
+                                     unsigned long start, unsigned int nr,
+                                     unsigned long shift,
+                                     unsigned long boundary_size,
+                                     unsigned long align_mask);
+
+static inline unsigned long iommu_num_pages(unsigned long addr,
+                                           unsigned long len,
+                                           unsigned long io_page_size)
+{
+       unsigned long size = (addr & (io_page_size - 1)) + len;
+
+       return DIV_ROUND_UP(size, io_page_size);
+}
+
+#endif