The patch titled
iommu: export iommu_is_span_boundary helper function
has been added to the -mm tree. Its filename is
iommu-export-iommu_is_span_boundary-helper-function.patch
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Subject: iommu: export iommu_is_span_boundary helper function
From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Cc: Kyle McMartin <kyle@xxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <matthew@xxxxxx>
Cc: Grant Grundler <grundler@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/iommu-helper.h | 3 +++
lib/iommu-helper.c | 10 ++++++----
2 files changed, 9 insertions(+), 4 deletions(-)
diff -puN include/linux/iommu-helper.h~iommu-export-iommu_is_span_boundary-helper-function include/linux/iommu-helper.h
--- a/include/linux/iommu-helper.h~iommu-export-iommu_is_span_boundary-helper-function
+++ a/include/linux/iommu-helper.h
@@ -1,3 +1,6 @@
+extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
+ unsigned long shift,
+ unsigned long boundary_size);
extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr,
unsigned long shift,
diff -puN lib/iommu-helper.c~iommu-export-iommu_is_span_boundary-helper-function lib/iommu-helper.c
--- a/lib/iommu-helper.c~iommu-export-iommu_is_span_boundary-helper-function
+++ a/lib/iommu-helper.c
@@ -40,10 +40,12 @@ static inline void set_bit_area(unsigned
}
}
-static inline int is_span_boundary(unsigned int index, unsigned int nr,
- unsigned long shift,
- unsigned long boundary_size)
+int iommu_is_span_boundary(unsigned int index, unsigned int nr,
+ unsigned long shift,
+ unsigned long boundary_size)
{
+ BUG_ON(!is_power_of_2(boundary_size));
+
shift = (shift + index) & (boundary_size - 1);
return shift + nr > boundary_size;
}
@@ -57,7 +59,7 @@ unsigned long iommu_area_alloc(unsigned
again:
index = find_next_zero_area(map, size, start, nr, align_mask);
if (index != -1) {
- if (is_span_boundary(index, nr, shift, boundary_size)) {
+ if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
/* we could do more effectively */
start = index + 1;
goto again;
_
Patches currently in -mm which might be from fujita.tomonori@xxxxxxxxxxxxx are
git-scsi-misc.patch
alpha-convert-iommu-to-use-align.patch
alpha-iommu-had-better-access-to-the-free-space-bitmap-at-only-one-place.patch
alpha-make-iommu-respect-the-segment-boundary-limits.patch
alpha-remove-unused-debug_forcedac-define-in-iommu.patch
iommu-export-iommu_is_span_boundary-helper-function.patch
iommu-parisc-pass-struct-device-to-iommu_alloc_range.patch
iommu-parisc-make-the-iommus-respect-the-segment-boundary-limits.patch
mpt-fusion-dont-oops-if-numphys==0.patch
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