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29 lines
755 B
29 lines
755 B
// 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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