| #ifndef _ASM_ARM_XEN_PAGE_COHERENT_H |
| #define _ASM_ARM_XEN_PAGE_COHERENT_H |
| |
| #include <asm/page.h> |
| #include <linux/dma-attrs.h> |
| #include <linux/dma-mapping.h> |
| |
| void __xen_dma_map_page(struct device *hwdev, struct page *page, |
| dma_addr_t dev_addr, unsigned long offset, size_t size, |
| enum dma_data_direction dir, struct dma_attrs *attrs); |
| void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, |
| size_t size, enum dma_data_direction dir, |
| struct dma_attrs *attrs); |
| void __xen_dma_sync_single_for_cpu(struct device *hwdev, |
| dma_addr_t handle, size_t size, enum dma_data_direction dir); |
| |
| void __xen_dma_sync_single_for_device(struct device *hwdev, |
| dma_addr_t handle, size_t size, enum dma_data_direction dir); |
| |
| static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size, |
| dma_addr_t *dma_handle, gfp_t flags, |
| struct dma_attrs *attrs) |
| { |
| return __generic_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs); |
| } |
| |
| static inline void xen_free_coherent_pages(struct device *hwdev, size_t size, |
| void *cpu_addr, dma_addr_t dma_handle, |
| struct dma_attrs *attrs) |
| { |
| __generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs); |
| } |
| |
| static inline void xen_dma_map_page(struct device *hwdev, struct page *page, |
| dma_addr_t dev_addr, unsigned long offset, size_t size, |
| enum dma_data_direction dir, struct dma_attrs *attrs) |
| { |
| bool local = PFN_DOWN(dev_addr) == page_to_pfn(page); |
| /* Dom0 is mapped 1:1, so if pfn == mfn the page is local otherwise |
| * is a foreign page grant-mapped in dom0. If the page is local we |
| * can safely call the native dma_ops function, otherwise we call |
| * the xen specific function. */ |
| if (local) |
| __generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs); |
| else |
| __xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs); |
| } |
| |
| static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle, |
| size_t size, enum dma_data_direction dir, |
| struct dma_attrs *attrs) |
| { |
| unsigned long pfn = PFN_DOWN(handle); |
| /* Dom0 is mapped 1:1, so calling pfn_valid on a foreign mfn will |
| * always return false. If the page is local we can safely call the |
| * native dma_ops function, otherwise we call the xen specific |
| * function. */ |
| if (pfn_valid(pfn)) { |
| if (__generic_dma_ops(hwdev)->unmap_page) |
| __generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs); |
| } else |
| __xen_dma_unmap_page(hwdev, handle, size, dir, attrs); |
| } |
| |
| static inline void xen_dma_sync_single_for_cpu(struct device *hwdev, |
| dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| { |
| unsigned long pfn = PFN_DOWN(handle); |
| if (pfn_valid(pfn)) { |
| if (__generic_dma_ops(hwdev)->sync_single_for_cpu) |
| __generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir); |
| } else |
| __xen_dma_sync_single_for_cpu(hwdev, handle, size, dir); |
| } |
| |
| static inline void xen_dma_sync_single_for_device(struct device *hwdev, |
| dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| { |
| unsigned long pfn = PFN_DOWN(handle); |
| if (pfn_valid(pfn)) { |
| if (__generic_dma_ops(hwdev)->sync_single_for_device) |
| __generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir); |
| } else |
| __xen_dma_sync_single_for_device(hwdev, handle, size, dir); |
| } |
| |
| #endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */ |