1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_DMA_DIRECT_H
3 #define _LINUX_DMA_DIRECT_H 1
5 #include <linux/dma-mapping.h>
6 #include <linux/mem_encrypt.h>
8 extern unsigned int zone_dma_bits;
10 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
11 #include <asm/dma-direct.h>
13 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
15 dma_addr_t dev_addr = (dma_addr_t)paddr;
17 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
20 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
22 phys_addr_t paddr = (phys_addr_t)dev_addr;
24 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
27 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
32 return addr + size - 1 <=
33 min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
35 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
37 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
38 bool force_dma_unencrypted(struct device *dev);
40 static inline bool force_dma_unencrypted(struct device *dev)
44 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
47 * If memory encryption is supported, phys_to_dma will set the memory encryption
48 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
49 * and __dma_to_phys versions should only be used on non-encrypted memory for
50 * special occasions like DMA coherent buffers.
52 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
54 return __sme_set(__phys_to_dma(dev, paddr));
57 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
59 return __sme_clr(__dma_to_phys(dev, daddr));
62 u64 dma_direct_get_required_mask(struct device *dev);
63 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
64 gfp_t gfp, unsigned long attrs);
65 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
66 dma_addr_t dma_addr, unsigned long attrs);
67 void *dma_direct_alloc_pages(struct device *dev, size_t size,
68 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
69 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
70 dma_addr_t dma_addr, unsigned long attrs);
71 struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
72 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
73 void __dma_direct_free_pages(struct device *dev, size_t size, struct page *page);
74 int dma_direct_supported(struct device *dev, u64 mask);
75 #endif /* _LINUX_DMA_DIRECT_H */