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 #define DIRECT_MAPPING_ERROR 0 9 10 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA 11 #include <asm/dma-direct.h> 12 #else 13 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) 14 { 15 dma_addr_t dev_addr = (dma_addr_t)paddr; 16 17 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); 18 } 19 20 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr) 21 { 22 phys_addr_t paddr = (phys_addr_t)dev_addr; 23 24 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); 25 } 26 27 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) 28 { 29 if (!dev->dma_mask) 30 return false; 31 32 return addr + size - 1 <= 33 min_not_zero(*dev->dma_mask, dev->bus_dma_mask); 34 } 35 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */ 36 37 /* 38 * If memory encryption is supported, phys_to_dma will set the memory encryption 39 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma 40 * and __dma_to_phys versions should only be used on non-encrypted memory for 41 * special occasions like DMA coherent buffers. 42 */ 43 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) 44 { 45 return __sme_set(__phys_to_dma(dev, paddr)); 46 } 47 48 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) 49 { 50 return __sme_clr(__dma_to_phys(dev, daddr)); 51 } 52 53 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN 54 void dma_mark_clean(void *addr, size_t size); 55 #else 56 static inline void dma_mark_clean(void *addr, size_t size) 57 { 58 } 59 #endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */ 60 61 u64 dma_direct_get_required_mask(struct device *dev); 62 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, 63 gfp_t gfp, unsigned long attrs); 64 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, 65 dma_addr_t dma_addr, unsigned long attrs); 66 void *dma_direct_alloc_pages(struct device *dev, size_t size, 67 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); 68 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr, 69 dma_addr_t dma_addr, unsigned long attrs); 70 dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, 71 unsigned long offset, size_t size, enum dma_data_direction dir, 72 unsigned long attrs); 73 int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, 74 enum dma_data_direction dir, unsigned long attrs); 75 int dma_direct_supported(struct device *dev, u64 mask); 76 int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr); 77 #endif /* _LINUX_DMA_DIRECT_H */ 78