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 8static 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 17static 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 24static 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 28static 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 32static 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 35static 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