arch/x86/include/asm/xen/page-coherent.h

   1 #ifndef _ASM_X86_XEN_PAGE_COHERENT_H
   2 #define _ASM_X86_XEN_PAGE_COHERENT_H
   3
   4 #include <asm/page.h>
   5 #include <linux/dma-attrs.h>
   6 #include <linux/dma-mapping.h>
   7
   8 static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
   9                 dma_addr_t *dma_handle, gfp_t flags,
  10                 struct dma_attrs *attrs)
  11 {
  12         void *vstart = (void*)__get_free_pages(flags, get_order(size));
  13         *dma_handle = virt_to_phys(vstart);
  14         return vstart;
  15 }
  16
  17 static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
  18                 void *cpu_addr, dma_addr_t dma_handle,
  19                 struct dma_attrs *attrs)
  20 {
  21         free_pages((unsigned long) cpu_addr, get_order(size));
  22 }
  23
  24 static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
  25              dma_addr_t dev_addr, unsigned long offset, size_t size,
  26              enum dma_data_direction dir, struct dma_attrs *attrs) { }
  27
  28 static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
  29                 size_t size, enum dma_data_direction dir,
  30                 struct dma_attrs *attrs) { }
  31
  32 static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
  33                 dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
  34
  35 static inline void xen_dma_sync_single_for_device(struct device *hwdev,
  36                 dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
  37
  38 #endif /* _ASM_X86_XEN_PAGE_COHERENT_H */