1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_DMA_MAPPING_H 3 #define _ASM_X86_DMA_MAPPING_H 4 5 /* 6 * IOMMU interface. See Documentation/DMA-API-HOWTO.txt and 7 * Documentation/DMA-API.txt for documentation. 8 */ 9 10 #include <linux/scatterlist.h> 11 #include <linux/dma-debug.h> 12 #include <asm/io.h> 13 #include <asm/swiotlb.h> 14 #include <linux/dma-contiguous.h> 15 16 #ifdef CONFIG_ISA 17 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(24) 18 #else 19 # define ISA_DMA_BIT_MASK DMA_BIT_MASK(32) 20 #endif 21 22 extern int iommu_merge; 23 extern struct device x86_dma_fallback_dev; 24 extern int panic_on_overflow; 25 26 extern const struct dma_map_ops *dma_ops; 27 28 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) 29 { 30 return dma_ops; 31 } 32 33 bool arch_dma_alloc_attrs(struct device **dev); 34 #define arch_dma_alloc_attrs arch_dma_alloc_attrs 35 36 #endif 37