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/memblock.h> /* for min_low_pfn */
7 #include <linux/mem_encrypt.h>
9 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
10 #include <asm/dma-direct.h>
12 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
14 dma_addr_t dev_addr = (dma_addr_t)paddr;
16 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
19 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
21 phys_addr_t paddr = (phys_addr_t)dev_addr;
23 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
25 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
27 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
28 bool force_dma_unencrypted(struct device *dev);
30 static inline bool force_dma_unencrypted(struct device *dev)
34 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
37 * If memory encryption is supported, phys_to_dma will set the memory encryption
38 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
39 * and __dma_to_phys versions should only be used on non-encrypted memory for
40 * special occasions like DMA coherent buffers.
42 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
44 return __sme_set(__phys_to_dma(dev, paddr));
47 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
49 return __sme_clr(__dma_to_phys(dev, daddr));
52 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
55 dma_addr_t end = addr + size - 1;
60 if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
61 min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
64 return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
67 u64 dma_direct_get_required_mask(struct device *dev);
68 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
69 gfp_t gfp, unsigned long attrs);
70 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
71 dma_addr_t dma_addr, unsigned long attrs);
72 void *dma_direct_alloc_pages(struct device *dev, size_t size,
73 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
74 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
75 dma_addr_t dma_addr, unsigned long attrs);
76 struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
77 gfp_t gfp, unsigned long attrs);
78 int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,
79 void *cpu_addr, dma_addr_t dma_addr, size_t size,
81 bool dma_direct_can_mmap(struct device *dev);
82 int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
83 void *cpu_addr, dma_addr_t dma_addr, size_t size,
85 int dma_direct_supported(struct device *dev, u64 mask);
86 #endif /* _LINUX_DMA_DIRECT_H */