arch/x86/include/asm/swiotlb.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_SWIOTLB_H
   3 #define _ASM_X86_SWIOTLB_H
   4
   5 #include <linux/swiotlb.h>
   6
   7 #ifdef CONFIG_SWIOTLB
   8 extern int swiotlb;
   9 extern int __init pci_swiotlb_detect_override(void);
  10 extern int __init pci_swiotlb_detect_4gb(void);
  11 extern void __init pci_swiotlb_init(void);
  12 extern void __init pci_swiotlb_late_init(void);
  13 #else
  14 #define swiotlb 0
  15 static inline int pci_swiotlb_detect_override(void)
  16 {
  17         return 0;
  18 }
  19 static inline int pci_swiotlb_detect_4gb(void)
  20 {
  21         return 0;
  22 }
  23 static inline void pci_swiotlb_init(void)
  24 {
  25 }
  26 static inline void pci_swiotlb_late_init(void)
  27 {
  28 }
  29 #endif
  30
  31 extern void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
  32                                         dma_addr_t *dma_handle, gfp_t flags,
  33                                         unsigned long attrs);
  34 extern void x86_swiotlb_free_coherent(struct device *dev, size_t size,
  35                                         void *vaddr, dma_addr_t dma_addr,
  36                                         unsigned long attrs);
  37
  38 #endif /* _ASM_X86_SWIOTLB_H */