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/scatterlist.h>
11 #include <linux/dma-debug.h>
13 #include <asm/swiotlb.h>
14 #include <linux/dma-contiguous.h>
15 #include <linux/mem_encrypt.h>
18 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
20 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
23 extern int iommu_merge;
24 extern struct device x86_dma_fallback_dev;
25 extern int panic_on_overflow;
27 extern const struct dma_map_ops *dma_ops;
29 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
34 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
35 #define arch_dma_alloc_attrs arch_dma_alloc_attrs
37 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
38 dma_addr_t *dma_addr, gfp_t flag,
41 extern void dma_generic_free_coherent(struct device *dev, size_t size,
42 void *vaddr, dma_addr_t dma_addr,
45 #ifdef CONFIG_X86_DMA_REMAP /* Platform code defines bridge-specific code */
46 extern bool dma_capable(struct device *dev, dma_addr_t addr, size_t size);
47 extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
48 extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
51 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
56 return addr + size - 1 <= *dev->dma_mask;
59 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
61 return __sme_set(paddr);
64 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
66 return __sme_clr(daddr);
68 #endif /* CONFIG_X86_DMA_REMAP */
70 static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
73 unsigned long dma_mask = 0;
75 dma_mask = dev->coherent_dma_mask;
77 dma_mask = (gfp & GFP_DMA) ? DMA_BIT_MASK(24) : DMA_BIT_MASK(32);
82 static inline gfp_t dma_alloc_coherent_gfp_flags(struct device *dev, gfp_t gfp)
84 unsigned long dma_mask = dma_alloc_coherent_mask(dev, gfp);
86 if (dma_mask <= DMA_BIT_MASK(24))
89 if (dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))