Root/
1 | /* |
2 | * IOMMU helper functions for the free area management |
3 | */ |
4 | |
5 | #include <linux/module.h> |
6 | #include <linux/bitmap.h> |
7 | |
8 | int iommu_is_span_boundary(unsigned int index, unsigned int nr, |
9 | unsigned long shift, |
10 | unsigned long boundary_size) |
11 | { |
12 | BUG_ON(!is_power_of_2(boundary_size)); |
13 | |
14 | shift = (shift + index) & (boundary_size - 1); |
15 | return shift + nr > boundary_size; |
16 | } |
17 | |
18 | unsigned long iommu_area_alloc(unsigned long *map, unsigned long size, |
19 | unsigned long start, unsigned int nr, |
20 | unsigned long shift, unsigned long boundary_size, |
21 | unsigned long align_mask) |
22 | { |
23 | unsigned long index; |
24 | |
25 | /* We don't want the last of the limit */ |
26 | size -= 1; |
27 | again: |
28 | index = bitmap_find_next_zero_area(map, size, start, nr, align_mask); |
29 | if (index < size) { |
30 | if (iommu_is_span_boundary(index, nr, shift, boundary_size)) { |
31 | /* we could do more effectively */ |
32 | start = index + 1; |
33 | goto again; |
34 | } |
35 | bitmap_set(map, index, nr); |
36 | return index; |
37 | } |
38 | return -1; |
39 | } |
40 | EXPORT_SYMBOL(iommu_area_alloc); |
41 | |
42 | unsigned long iommu_num_pages(unsigned long addr, unsigned long len, |
43 | unsigned long io_page_size) |
44 | { |
45 | unsigned long size = (addr & (io_page_size - 1)) + len; |
46 | |
47 | return DIV_ROUND_UP(size, io_page_size); |
48 | } |
49 | EXPORT_SYMBOL(iommu_num_pages); |
50 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9