[PATCH v8 01/17] arm: make SWIOTLB available
From: Stefano Stabellini <hidden>
Date: 2013-10-09 20:49:35
Also in:
lkml, xen-devel
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
IOMMU_HELPER is needed because SWIOTLB calls iommu_is_span_boundary, provided by lib/iommu_helper.c. Signed-off-by: Stefano Stabellini <redacted> Reviewed-by: Konrad Rzeszutek Wilk <redacted> CC: will.deacon at arm.com CC: linux at arm.linux.org.uk Changes in v7: - dma_mark_clean: empty implementation; - in dma_capable use coherent_dma_mask if dma_mask hasn't been allocated. Changes in v6: - check for dev->dma_mask being NULL in dma_capable. Changes in v5: - implement dma_mark_clean using dmac_flush_range. Changes in v3: - dma_capable: do not treat dma_mask as a limit; - remove SWIOTLB dependency on NEED_SG_DMA_LENGTH. --- arch/arm/Kconfig | 6 +++++ arch/arm/include/asm/dma-mapping.h | 37 ++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+), 0 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ba412e0..c0bfb33 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig@@ -1832,6 +1832,12 @@ config CC_STACKPROTECTOR neutralized via a kernel panic. This feature requires gcc version 4.2 or above. +config SWIOTLB + def_bool y + +config IOMMU_HELPER + def_bool SWIOTLB + config XEN_DOM0 def_bool y depends on XEN
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 5b579b9..9aa5384 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h@@ -10,6 +10,7 @@ #include <asm-generic/dma-coherent.h> #include <asm/memory.h> +#include <asm/cacheflush.h> #define DMA_ERROR_CODE (~0) extern struct dma_map_ops arm_dma_ops;
@@ -86,6 +87,42 @@ static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) } #endif +static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + unsigned int offset = paddr & ~PAGE_MASK; + return pfn_to_dma(dev, paddr >> PAGE_SHIFT) + offset; +} + +static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) +{ + unsigned int offset = dev_addr & ~PAGE_MASK; + return (dma_to_pfn(dev, dev_addr) << PAGE_SHIFT) + offset; +} + +static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) +{ + u64 limit, mask; + + if (dev->dma_mask) + mask = *dev->dma_mask; + else + mask = dev->coherent_dma_mask; + + if (mask == 0) + return 0; + + limit = (mask + 1) & ~mask; + if (limit && size > limit) + return 0; + + if ((addr | (addr + size - 1)) & ~mask) + return 0; + + return 1; +} + +static inline void dma_mark_clean(void *addr, size_t size) { } + /* * DMA errors are defined by all-bits-set in the DMA address. */
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1.7.2.5