diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-04-29 00:59:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:05 -0700 |
| commit | a8522509200b460443a7ca59138dc63bec1b690a (patch) | |
| tree | d3da544c245a40740018080e9e451fc9096aedb3 | |
| parent | a7133a15587b8921af8b074e0d3fe1606cbe5597 (diff) | |
| download | lwn-a8522509200b460443a7ca59138dc63bec1b690a.tar.gz lwn-a8522509200b460443a7ca59138dc63bec1b690a.zip | |
swiotlb: use iommu_is_span_boundary helper function
iommu_is_span_boundary in lib/iommu-helper.c was exported for PARISC IOMMUs
(commit 3715863aa142c4f4c5208f5f3e5e9bac06006d2f). 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>
| -rw-r--r-- | arch/ia64/Kconfig | 5 | ||||
| -rw-r--r-- | arch/x86/Kconfig | 5 | ||||
| -rw-r--r-- | lib/swiotlb.c | 14 |
3 files changed, 9 insertions, 15 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 3aa6c821449a..07f5d353b54a 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -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" diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index a12dbb2b93f3..1d9d874cba59 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -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)" diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 256c8445e54d..3c95922e51e7 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -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; |