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 extern unsigned int zone_dma_bits;
11 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
12 #include <asm/dma-direct.h>
14 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
16 dma_addr_t dev_addr = (dma_addr_t)paddr;
18 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
21 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
23 phys_addr_t paddr = (phys_addr_t)dev_addr;
25 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
27 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
29 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
30 bool force_dma_unencrypted(struct device *dev);
32 static inline bool force_dma_unencrypted(struct device *dev)
36 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
39 * If memory encryption is supported, phys_to_dma will set the memory encryption
40 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
41 * and __dma_to_phys versions should only be used on non-encrypted memory for
42 * special occasions like DMA coherent buffers.
44 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
46 return __sme_set(__phys_to_dma(dev, paddr));
49 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
51 return __sme_clr(__dma_to_phys(dev, daddr));
54 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
57 dma_addr_t end = addr + size - 1;
62 if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
63 min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
66 return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
69 u64 dma_direct_get_required_mask(struct device *dev);
70 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
71 gfp_t gfp, unsigned long attrs);
72 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
73 dma_addr_t dma_addr, unsigned long attrs);
74 void *dma_direct_alloc_pages(struct device *dev, size_t size,
75 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
76 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
77 dma_addr_t dma_addr, unsigned long attrs);
78 struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
79 gfp_t gfp, unsigned long attrs);
80 int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,
81 void *cpu_addr, dma_addr_t dma_addr, size_t size,
83 bool dma_direct_can_mmap(struct device *dev);
84 int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
85 void *cpu_addr, dma_addr_t dma_addr, size_t size,
87 int dma_direct_supported(struct device *dev, u64 mask);
88 #endif /* _LINUX_DMA_DIRECT_H */