// SPDX-License-Identifier: GPL-2.0
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/*
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* IOMMU helper functions for the free area management
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*/
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#include <linux/bitmap.h>
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#include <linux/iommu-helper.h>
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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, unsigned long boundary_size,
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unsigned long align_mask)
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{
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unsigned long index;
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/* We don't want the last of the limit */
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size -= 1;
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again:
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index = bitmap_find_next_zero_area(map, size, start, nr, align_mask);
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if (index < size) {
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if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
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start = ALIGN(shift + index, boundary_size) - shift;
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goto again;
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}
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bitmap_set(map, index, nr);
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return index;
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}
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return -1;
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}
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