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
__phys_to_dma(struct device * dev,phys_addr_t paddr)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
__dma_to_phys(struct device * dev,dma_addr_t dev_addr)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
dma_capable(struct device * dev,dma_addr_t addr,size_t size)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 #ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
36 bool force_dma_unencrypted(struct device *dev);
37 #else
force_dma_unencrypted(struct device * dev)38 static inline bool force_dma_unencrypted(struct device *dev)
39 {
40 return false;
41 }
42 #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
43
44 /*
45 * If memory encryption is supported, phys_to_dma will set the memory encryption
46 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
47 * and __dma_to_phys versions should only be used on non-encrypted memory for
48 * special occasions like DMA coherent buffers.
49 */
phys_to_dma(struct device * dev,phys_addr_t paddr)50 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
51 {
52 return __sme_set(__phys_to_dma(dev, paddr));
53 }
54
dma_to_phys(struct device * dev,dma_addr_t daddr)55 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
56 {
57 return __sme_clr(__dma_to_phys(dev, daddr));
58 }
59
60 u64 dma_direct_get_required_mask(struct device *dev);
61 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
62 gfp_t gfp, unsigned long attrs);
63 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
64 dma_addr_t dma_addr, unsigned long attrs);
65 void *dma_direct_alloc_pages(struct device *dev, size_t size,
66 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
67 void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
68 dma_addr_t dma_addr, unsigned long attrs);
69 struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
70 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs);
71 void __dma_direct_free_pages(struct device *dev, size_t size, struct page *page);
72 int dma_direct_supported(struct device *dev, u64 mask);
73 #endif /* _LINUX_DMA_DIRECT_H */
74
