Blame view
lib/iommu-helper.c
1.75 KB
0291df8cc
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
/* * IOMMU helper functions for the free area management */ #include <linux/module.h> #include <linux/bitops.h> static unsigned long find_next_zero_area(unsigned long *map, unsigned long size, unsigned long start, unsigned int nr, unsigned long align_mask) { unsigned long index, end, i; again: index = find_next_zero_bit(map, size, start); /* Align allocation */ index = (index + align_mask) & ~align_mask; end = index + nr; if (end >= size) return -1; for (i = index; i < end; i++) { if (test_bit(i, map)) { start = i+1; goto again; } } return index; } |
d26dbc5cf
|
32 |
void iommu_area_reserve(unsigned long *map, unsigned long i, int len) |
0291df8cc
|
33 34 35 36 37 38 39 |
{ unsigned long end = i + len; while (i < end) { __set_bit(i, map); i++; } } |
3715863aa
|
40 41 42 |
int iommu_is_span_boundary(unsigned int index, unsigned int nr, unsigned long shift, unsigned long boundary_size) |
0291df8cc
|
43 |
{ |
3715863aa
|
44 |
BUG_ON(!is_power_of_2(boundary_size)); |
0291df8cc
|
45 46 47 48 49 50 51 52 53 54 55 56 57 |
shift = (shift + index) & (boundary_size - 1); return shift + nr > boundary_size; } 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; again: index = find_next_zero_area(map, size, start, nr, align_mask); if (index != -1) { |
3715863aa
|
58 |
if (iommu_is_span_boundary(index, nr, shift, boundary_size)) { |
0291df8cc
|
59 60 61 62 |
/* we could do more effectively */ start = index + 1; goto again; } |
d26dbc5cf
|
63 |
iommu_area_reserve(map, index, nr); |
0291df8cc
|
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 |
} return index; } EXPORT_SYMBOL(iommu_area_alloc); void iommu_area_free(unsigned long *map, unsigned long start, unsigned int nr) { unsigned long end = start + nr; while (start < end) { __clear_bit(start, map); start++; } } EXPORT_SYMBOL(iommu_area_free); |