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

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  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 */
 39 

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