1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_DMA_DIRECT_H 3 #define _LINUX_DMA_DIRECT_H 1 4 5 #include <linux/dma-mapping.h> 6 #include <linux/mem_encrypt.h> 7 8 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA 9 #include <asm/dma-direct.h> 10 #else 11 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) 12 { 13 dma_addr_t dev_addr = (dma_addr_t)paddr; 14 15 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); 16 } 17 18 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr) 19 { 20 phys_addr_t paddr = (phys_addr_t)dev_addr; 21 22 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); 23 } 24 25 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) 26 { 27 if (!dev->dma_mask) 28 return false; 29 30 return addr + size - 1 <= *dev->dma_mask; 31 } 32 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */ 33 34 /* 35 * If memory encryption is supported, phys_to_dma will set the memory encryption 36 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma 37 * and __dma_to_phys versions should only be used on non-encrypted memory for 38 * special occasions like DMA coherent buffers. 39 */ 40 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) 41 { 42 return __sme_set(__phys_to_dma(dev, paddr)); 43 } 44 45 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) 46 { 47 return __sme_clr(__dma_to_phys(dev, daddr)); 48 } 49 50 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN 51 void dma_mark_clean(void *addr, size_t size); 52 #else 53 static inline void dma_mark_clean(void *addr, size_t size) 54 { 55 } 56 #endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */ 57 58 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, 59 gfp_t gfp, unsigned long attrs); 60 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, 61 dma_addr_t dma_addr, unsigned long attrs); 62 dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, 63 unsigned long offset, size_t size, enum dma_data_direction dir, 64 unsigned long attrs); 65 int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, 66 enum dma_data_direction dir, unsigned long attrs); 67 int dma_direct_supported(struct device *dev, u64 mask); 68 int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr); 69 #endif /* _LINUX_DMA_DIRECT_H */ 70