[PATCH 1/3] ARM/dma-mapping: move various helpers from dma-mapping.h to dma-direct.h
From: Christoph Hellwig <hch@lst.de>
Date: 2020-09-10 05:41:47
Also in:
linux-acpi, linux-devicetree, linux-iommu, linux-pci, linux-sh, linux-usb, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Move the helpers to translate to and from direct mapping DMA addresses to dma-direct.h. This not only is the most logical place, but the new placement also avoids dependency loops with pending commits. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/arm/common/dmabounce.c | 2 +- arch/arm/include/asm/dma-direct.h | 70 ++++++++++++++++++++++++++++++ arch/arm/include/asm/dma-mapping.h | 70 ------------------------------ 3 files changed, 71 insertions(+), 71 deletions(-)
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index f4b719bde76367..d3e00ea9208834 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c@@ -24,7 +24,7 @@ #include <linux/slab.h> #include <linux/page-flags.h> #include <linux/device.h> -#include <linux/dma-mapping.h> +#include <linux/dma-direct.h> #include <linux/dmapool.h> #include <linux/list.h> #include <linux/scatterlist.h>
diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h
index 7c3001a6a775bf..de0f4ff9279615 100644
--- a/arch/arm/include/asm/dma-direct.h
+++ b/arch/arm/include/asm/dma-direct.h@@ -2,6 +2,76 @@ #ifndef ASM_ARM_DMA_DIRECT_H #define ASM_ARM_DMA_DIRECT_H 1 +#include <asm/memory.h> + +#ifdef __arch_page_to_dma +#error Please update to __arch_pfn_to_dma +#endif + +/* + * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private + * functions used internally by the DMA-mapping API to provide DMA + * addresses. They must not be used by drivers. + */ +#ifndef __arch_pfn_to_dma +static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) +{ + if (dev) + pfn -= dev->dma_pfn_offset; + return (dma_addr_t)__pfn_to_bus(pfn); +} + +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) +{ + unsigned long pfn = __bus_to_pfn(addr); + + if (dev) + pfn += dev->dma_pfn_offset; + + return pfn; +} + +static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) +{ + if (dev) { + unsigned long pfn = dma_to_pfn(dev, addr); + + return phys_to_virt(__pfn_to_phys(pfn)); + } + + return (void *)__bus_to_virt((unsigned long)addr); +} + +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) +{ + if (dev) + return pfn_to_dma(dev, virt_to_pfn(addr)); + + return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); +} + +#else +static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) +{ + return __arch_pfn_to_dma(dev, pfn); +} + +static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) +{ + return __arch_dma_to_pfn(dev, addr); +} + +static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) +{ + return __arch_dma_to_virt(dev, addr); +} + +static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) +{ + return __arch_virt_to_dma(dev, addr); +} +#endif + static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) { unsigned int offset = paddr & ~PAGE_MASK;
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index bdd80ddbca3451..0a1a536368c3a4 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h@@ -8,8 +8,6 @@ #include <linux/scatterlist.h> #include <linux/dma-debug.h> -#include <asm/memory.h> - #include <xen/xen.h> #include <asm/xen/hypervisor.h>
@@ -23,74 +21,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) return NULL; } -#ifdef __arch_page_to_dma -#error Please update to __arch_pfn_to_dma -#endif - -/* - * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private - * functions used internally by the DMA-mapping API to provide DMA - * addresses. They must not be used by drivers. - */ -#ifndef __arch_pfn_to_dma -static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) -{ - if (dev) - pfn -= dev->dma_pfn_offset; - return (dma_addr_t)__pfn_to_bus(pfn); -} - -static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) -{ - unsigned long pfn = __bus_to_pfn(addr); - - if (dev) - pfn += dev->dma_pfn_offset; - - return pfn; -} - -static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) -{ - if (dev) { - unsigned long pfn = dma_to_pfn(dev, addr); - - return phys_to_virt(__pfn_to_phys(pfn)); - } - - return (void *)__bus_to_virt((unsigned long)addr); -} - -static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) -{ - if (dev) - return pfn_to_dma(dev, virt_to_pfn(addr)); - - return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); -} - -#else -static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) -{ - return __arch_pfn_to_dma(dev, pfn); -} - -static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) -{ - return __arch_dma_to_pfn(dev, addr); -} - -static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) -{ - return __arch_dma_to_virt(dev, addr); -} - -static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) -{ - return __arch_virt_to_dma(dev, addr); -} -#endif - /** * arm_dma_alloc - allocate consistent memory for DMA * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
--
2.28.0
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