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/memblock.h> /* for min_low_pfn */
7 #include <linux/mem_encrypt.h>
8
9 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
10
11 #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
12 #include <asm/dma-direct.h>
13 #else
__phys_to_dma(struct device * dev,phys_addr_t paddr)14 static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
15 {
16 dma_addr_t dev_addr = (dma_addr_t)paddr;
17
18 return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
19 }
20
__dma_to_phys(struct device * dev,dma_addr_t dev_addr)21 static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
22 {
23 phys_addr_t paddr = (phys_addr_t)dev_addr;
24
25 return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
26 }
27
dma_capable(struct device * dev,dma_addr_t addr,size_t size)28 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
29 {
30 dma_addr_t end = addr + size - 1;
31
32 if (!dev->dma_mask)
33 return false;
34
35 if (!IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
36 min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
37 return false;
38
39 return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_mask);
40 }
41 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
42
43 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
44 bool force_dma_unencrypted(struct device *dev);
45 #else
force_dma_unencrypted(struct device * dev)46 static inline bool force_dma_unencrypted(struct device *dev)
47 {
48 return false;
49 }
50 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
51
52 /*
53 * If memory encryption is supported, phys_to_dma will set the memory encryption
54 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
55 * and __dma_to_phys versions should only be used on non-encrypted memory for
56 * special occasions like DMA coherent buffers.
57 */
phys_to_dma(struct device * dev,phys_addr_t paddr)58 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
59 {
60 return __sme_set(__phys_to_dma(dev, paddr));
61 }
62
dma_to_phys(struct device * dev,dma_addr_t daddr)63 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
64 {
65 return __sme_clr(__dma_to_phys(dev, daddr));
66 }
67
68 u64 dma_direct_get_required_mask(struct device *dev);
69 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
70 gfp_t gfp, unsigned long attrs);
71 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
72 dma_addr_t dma_addr, unsigned long attrs);
73 void *dma_direct_alloc_pages(struct device *dev, size_t size,
74 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
75 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
76 dma_addr_t dma_addr, unsigned long attrs);
77 struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
78 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
79 void __dma_direct_free_pages(struct device *dev, size_t size, struct page *page);
80 int dma_direct_supported(struct device *dev, u64 mask);
81 #endif /* _LINUX_DMA_DIRECT_H */
82