From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- include/linux/iommu-helper.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 include/linux/iommu-helper.h (limited to 'include/linux/iommu-helper.h') diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h new file mode 100644 index 00000000..86bdeffe --- /dev/null +++ b/include/linux/iommu-helper.h @@ -0,0 +1,34 @@ +#ifndef _LINUX_IOMMU_HELPER_H +#define _LINUX_IOMMU_HELPER_H + +#include + +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 -- cgit v1.3.1