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swiotlb: use iommu_is_span_boundary helper function

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iommu_is_span_boundary in lib/iommu-helper.c was exported for PARISC IOMMUs
(commit 3715863aa1).  SWIOTLB can use it instead
of the homegrown function.

Signed-off-by: FUJITA Tomonori <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Tony Luck <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
FUJITA Tomonori 2008-04-29 00:59:36 -07:00 • committed by Linus Torvalds
commit a852250920
3 changed files with 9 additions and 15 deletions
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14
lib/swiotlb.c
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@ -31,6 +31,7 @@
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/iommu-helper.h>
#define OFFSET(val,align) ((unsigned long) \
( (val) & ( (align) - 1)))
@ -282,15 +283,6 @@ address_needs_mapping(struct device *hwdev, dma_addr_t addr)
return (addr & ~mask) != 0;
}
static inline unsigned int is_span_boundary(unsigned int index,
unsigned int nslots,
unsigned long offset_slots,
unsigned long max_slots)
{
unsigned long offset = (offset_slots + index) & (max_slots - 1);
return offset + nslots > max_slots;
}
/*
* Allocates bounce buffer and returns its kernel virtual address.
*/
@ -337,8 +329,8 @@ map_single(struct device *hwdev, char *buffer, size_t size, int dir)
wrap = index;
do {
while (is_span_boundary(index, nslots, offset_slots,
max_slots)) {
while (iommu_is_span_boundary(index, nslots, offset_slots,
max_slots)) {
index += stride;
if (index >= io_tlb_nslabs)
index = 0;