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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-03-04 17:29:27 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 19:35:17 -0500
commit3715863aa142c4f4c5208f5f3e5e9bac06006d2f (patch)
treecd93a86f90bfd8e9bef9cbcf40abde55acc26b80 /lib/iommu-helper.c
parent7eb701dc7779794d46e02a7fa1380289cb730d46 (diff)
iommu: export iommu_is_span_boundary helper function
iommu_is_span_boundary is used internally in the IOMMU helper (lib/iommu-helper.c), a primitive function that judges whether a memory area spans LLD's segment boundary or not. It's difficult to convert some IOMMUs to use the IOMMU helper but iommu_is_span_boundary is still useful for them. So this patch exports it. This is needed for the parisc iommu fixes. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Kyle McMartin <kyle@parisc-linux.org> Cc: Matthew Wilcox <matthew@wil.cx> Cc: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/iommu-helper.c')
-rw-r--r--lib/iommu-helper.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index 495575a59ca6..a3b8d4c3f77a 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -40,10 +40,12 @@ static inline void set_bit_area(unsigned long *map, unsigned long i,
40 } 40 }
41} 41}
42 42
43static inline int is_span_boundary(unsigned int index, unsigned int nr, 43int iommu_is_span_boundary(unsigned int index, unsigned int nr,
44 unsigned long shift, 44 unsigned long shift,
45 unsigned long boundary_size) 45 unsigned long boundary_size)
46{ 46{
47 BUG_ON(!is_power_of_2(boundary_size));
48
47 shift = (shift + index) & (boundary_size - 1); 49 shift = (shift + index) & (boundary_size - 1);
48 return shift + nr > boundary_size; 50 return shift + nr > boundary_size;
49} 51}
@@ -57,7 +59,7 @@ unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
57again: 59again:
58 index = find_next_zero_area(map, size, start, nr, align_mask); 60 index = find_next_zero_area(map, size, start, nr, align_mask);
59 if (index != -1) { 61 if (index != -1) {
60 if (is_span_boundary(index, nr, shift, boundary_size)) { 62 if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
61 /* we could do more effectively */ 63 /* we could do more effectively */
62 start = index + 1; 64 start = index + 1;
63 goto again; 65 goto again;