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 <= 31 min_not_zero(*dev->dma_mask, dev->bus_dma_mask); 32 } 33 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */ 34 35 /* 36 * If memory encryption is supported, phys_to_dma will set the memory encryption 37 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma 38 * and __dma_to_phys versions should only be used on non-encrypted memory for 39 * special occasions like DMA coherent buffers. 40 */ 41 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) 42 { 43 return __sme_set(__phys_to_dma(dev, paddr)); 44 } 45 46 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) 47 { 48 return __sme_clr(__dma_to_phys(dev, daddr)); 49 } 50 51 u64 dma_direct_get_required_mask(struct device *dev); 52 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, 53 gfp_t gfp, unsigned long attrs); 54 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, 55 dma_addr_t dma_addr, unsigned long attrs); 56 void *dma_direct_alloc_pages(struct device *dev, size_t size, 57 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); 58 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr, 59 dma_addr_t dma_addr, unsigned long attrs); 60 struct page *__dma_direct_alloc_pages(struct device *dev, size_t size, 61 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); 62 void __dma_direct_free_pages(struct device *dev, size_t size, struct page *page); 63 int dma_direct_supported(struct device *dev, u64 mask); 64 #endif /* _LINUX_DMA_DIRECT_H */ 65