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 <= *dev->dma_mask;
31 }
32 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
33
34 /*
35 * If memory encryption is supported, phys_to_dma will set the memory encryption
36 * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
37 * and __dma_to_phys versions should only be used on non-encrypted memory for
38 * special occasions like DMA coherent buffers.
39 */
phys_to_dma(struct device * dev,phys_addr_t paddr)40 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
41 {
42 return __sme_set(__phys_to_dma(dev, paddr));
43 }
44
dma_to_phys(struct device * dev,dma_addr_t daddr)45 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
46 {
47 return __sme_clr(__dma_to_phys(dev, daddr));
48 }
49
50 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
51 void dma_mark_clean(void *addr, size_t size);
52 #else
dma_mark_clean(void * addr,size_t size)53 static inline void dma_mark_clean(void *addr, size_t size)
54 {
55 }
56 #endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
57
58 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
59 gfp_t gfp, unsigned long attrs);
60 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
61 dma_addr_t dma_addr, unsigned long attrs);
62 dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
63 unsigned long offset, size_t size, enum dma_data_direction dir,
64 unsigned long attrs);
65 int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
66 enum dma_data_direction dir, unsigned long attrs);
67 int dma_direct_supported(struct device *dev, u64 mask);
68 int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
69 #endif /* _LINUX_DMA_DIRECT_H */
70