1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_DMA_MAPPING_H
3 #define _ASM_X86_DMA_MAPPING_H
6 * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and
7 * Documentation/DMA-API.txt for documentation.
10 #include <linux/kmemcheck.h>
11 #include <linux/scatterlist.h>
12 #include <linux/dma-debug.h>
14 #include <asm/swiotlb.h>
15 #include <linux/dma-contiguous.h>
16 #include <linux/mem_encrypt.h>
19 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
21 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
24 extern int iommu_merge;
25 extern struct device x86_dma_fallback_dev;
26 extern int panic_on_overflow;
28 extern const struct dma_map_ops *dma_ops;
30 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
35 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
36 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
38 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
39 dma_addr_t *dma_addr, gfp_t flag,
42 extern void dma_generic_free_coherent(struct device *dev, size_t size,
43 void *vaddr, dma_addr_t dma_addr,
46 #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
47 extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
48 extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
49 extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
52 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
57 return addr + size - 1 <= *dev->dma_mask;
60 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
62 return __sme_set(paddr);
65 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
67 return __sme_clr(daddr);
69 #endif /* CONFIG_X86_DMA_REMAP */
72 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
73 enum dma_data_direction dir)
75 flush_write_buffers();
78 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
81 unsigned long dma_mask = 0;
83 dma_mask = dev->coherent_dma_mask;
85 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
90 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
92 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
94 if (dma_mask <= DMA_BIT_MASK(24))
97 if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))