arch/x86/include/asm/dma-mapping.h

   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