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swiotlb: use iommu_is_span_boundary helper function 

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 <fujita.tomonori@lab.ntt.co.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2008-04-29 00:59:36 -07:00 committed by Linus Torvalds
parent a7133a1558
commit a852250920
3 changed files with 9 additions and 15 deletions
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5
arch/ia64/Kconfig
View File

@ -47,6 +47,9 @@ config MMU
config SWIOTLB
bool
config IOMMU_HELPER
bool
config GENERIC_LOCKBREAK
bool
default y
@ -615,7 +618,7 @@ config IRQ_PER_CPU
default y
config IOMMU_HELPER
def_bool (IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB || IA64_GENERIC)
def_bool (IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB || IA64_GENERIC || SWIOTLB)
source "arch/ia64/hp/sim/Kconfig"

5
arch/x86/Kconfig
View File

@ -537,9 +537,6 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Calgary anyway, pass 'iommu=calgary' on the kernel command line.
If unsure, say Y.
config IOMMU_HELPER
def_bool (CALGARY_IOMMU || GART_IOMMU)
# need this always selected by IOMMU for the VIA workaround
config SWIOTLB
bool
@ -550,6 +547,8 @@ config SWIOTLB
access 32-bits of memory can be used on systems with more than
3 GB of memory. If unsure, say Y.
config IOMMU_HELPER
def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB)
config NR_CPUS
int "Maximum number of CPUs (2-255)"

14
lib/swiotlb.c
View File

@ -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;