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kernel/linux-rt-4.4.41/arch/x86/include/asm/swiotlb.h 960 Bytes
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  #ifndef _ASM_X86_SWIOTLB_H
  #define _ASM_X86_SWIOTLB_H
  
  #include <linux/swiotlb.h>
  
  #ifdef CONFIG_SWIOTLB
  extern int swiotlb;
  extern int __init pci_swiotlb_detect_override(void);
  extern int __init pci_swiotlb_detect_4gb(void);
  extern void __init pci_swiotlb_init(void);
  extern void __init pci_swiotlb_late_init(void);
  #else
  #define swiotlb 0
  static inline int pci_swiotlb_detect_override(void)
  {
  	return 0;
  }
  static inline int pci_swiotlb_detect_4gb(void)
  {
  	return 0;
  }
  static inline void pci_swiotlb_init(void)
  {
  }
  static inline void pci_swiotlb_late_init(void)
  {
  }
  #endif
  
  static inline void dma_mark_clean(void *addr, size_t size) {}
  
  extern void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  					dma_addr_t *dma_handle, gfp_t flags,
  					struct dma_attrs *attrs);
  extern void x86_swiotlb_free_coherent(struct device *dev, size_t size,
  					void *vaddr, dma_addr_t dma_addr,
  					struct dma_attrs *attrs);
  
  #endif /* _ASM_X86_SWIOTLB_H */