36 lines
950 B
C
36 lines
950 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_IOMMU_HELPER_H
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#define _LINUX_IOMMU_HELPER_H
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#include <linux/kernel.h>
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static inline unsigned long iommu_device_max_index(unsigned long size,
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unsigned long offset,
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u64 dma_mask)
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{
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if (size + offset > dma_mask)
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return dma_mask - offset + 1;
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else
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return size;
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}
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extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
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unsigned long shift,
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unsigned long boundary_size);
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extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
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unsigned long start, unsigned int nr,
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unsigned long shift,
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unsigned long boundary_size,
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unsigned long align_mask);
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static inline unsigned long iommu_num_pages(unsigned long addr,
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unsigned long len,
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unsigned long io_page_size)
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{
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unsigned long size = (addr & (io_page_size - 1)) + len;
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return DIV_ROUND_UP(size, io_page_size);
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}
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#endif
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