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iommu-helper.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_IOMMU_HELPER_H #define _LINUX_IOMMU_HELPER_H #include <linux/bug.h> #include <linux/log2.h> #include <linux/math.h> #include <linux/types.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; } static inline int iommu_is_span_boundary(unsigned int index, unsigned int nr, unsigned long shift, unsigned long boundary_size) { BUG_ON(!is_power_of_2(boundary_size)); shift = (shift + index) & (boundary_size - 1); return shift + nr > 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