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