Messages in this thread Patch in this message | | | Date | Fri, 2 Oct 2015 10:18:00 -0700 | From | Nishanth Aravamudan <> | Subject | [PATCH 1/2] powerpc/iommu: expose IOMMU page shift |
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We will leverage this macro in the NVMe driver, which needs to know the configured IOMMU page shift to properly configure its device's page size.
Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
--- Given this is available, it seems reasonable to expose -- and it doesn't really make sense to make the driver do a log2 call on the existing IOMMU_PAGE_SIZE() value.
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h index ca18cff..6fdf857 100644 --- a/arch/powerpc/include/asm/iommu.h +++ b/arch/powerpc/include/asm/iommu.h @@ -36,6 +36,7 @@ #define IOMMU_PAGE_MASK_4K (~((1 << IOMMU_PAGE_SHIFT_4K) - 1)) #define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K) +#define IOMMU_PAGE_SHIFT(tblptr) (tblptr)->it_page_shift #define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift) #define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1)) #define IOMMU_PAGE_ALIGN(addr, tblptr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE(tblptr))
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