Messages in this thread Patch in this message | | | From | Andy Shevchenko <> | Subject | [PATCH v2 1/1] iommu/vt-d: use lo_hi_readq() / lo_hi_writeq() | Date | Thu, 19 Nov 2015 18:22:47 +0200 |
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There is already helper functions to do 64-bit I/O on 32-bit machines or buses, thus we don't need to reinvent the wheel.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- Cahngelog v2: - rebase on top of recent linux-next include/linux/intel-iommu.h | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-)
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 821273c..34066ee 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -29,6 +29,8 @@ #include <linux/dma_remapping.h> #include <linux/mmu_notifier.h> #include <linux/list.h> +#include <linux/io-64-nonatomic-lo-hi.h> + #include <asm/cacheflush.h> #include <asm/iommu.h> @@ -71,24 +73,8 @@ #define OFFSET_STRIDE (9) -#ifdef CONFIG_64BIT #define dmar_readq(a) readq(a) #define dmar_writeq(a,v) writeq(v,a) -#else -static inline u64 dmar_readq(void __iomem *addr) -{ - u32 lo, hi; - lo = readl(addr); - hi = readl(addr + 4); - return (((u64) hi) << 32) + lo; -} - -static inline void dmar_writeq(void __iomem *addr, u64 val) -{ - writel((u32)val, addr); - writel((u32)(val >> 32), addr + 4); -} -#endif #define DMAR_VER_MAJOR(v) (((v) & 0xf0) >> 4) #define DMAR_VER_MINOR(v) ((v) & 0x0f) -- 2.6.2
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