99 lines
3.7 KiB
C
99 lines
3.7 KiB
C
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#ifndef _ASM_ARM_XEN_PAGE_COHERENT_H
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#define _ASM_ARM_XEN_PAGE_COHERENT_H
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#include <asm/page.h>
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#include <linux/dma-mapping.h>
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void __xen_dma_map_page(struct device *hwdev, struct page *page,
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dma_addr_t dev_addr, unsigned long offset, size_t size,
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enum dma_data_direction dir, unsigned long attrs);
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void __xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs);
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void __xen_dma_sync_single_for_cpu(struct device *hwdev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir);
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void __xen_dma_sync_single_for_device(struct device *hwdev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir);
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static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
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{
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return __generic_dma_ops(hwdev)->alloc(hwdev, size, dma_handle, flags, attrs);
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}
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static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
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void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
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{
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__generic_dma_ops(hwdev)->free(hwdev, size, cpu_addr, dma_handle, attrs);
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}
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static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
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dma_addr_t dev_addr, unsigned long offset, size_t size,
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enum dma_data_direction dir, unsigned long attrs)
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{
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unsigned long page_pfn = page_to_xen_pfn(page);
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unsigned long dev_pfn = XEN_PFN_DOWN(dev_addr);
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unsigned long compound_pages =
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(1<<compound_order(page)) * XEN_PFN_PER_PAGE;
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bool local = (page_pfn <= dev_pfn) &&
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(dev_pfn - page_pfn < compound_pages);
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/*
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* Dom0 is mapped 1:1, while the Linux page can span across
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* multiple Xen pages, it's not possible for it to contain a
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* mix of local and foreign Xen pages. So if the first xen_pfn
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* == mfn the page is local otherwise it's a foreign page
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* grant-mapped in dom0. If the page is local we can safely
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* call the native dma_ops function, otherwise we call the xen
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* specific function.
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*/
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if (local)
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__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
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else
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__xen_dma_map_page(hwdev, page, dev_addr, offset, size, dir, attrs);
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}
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static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
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size_t size, enum dma_data_direction dir, unsigned long attrs)
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{
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unsigned long pfn = PFN_DOWN(handle);
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/*
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* Dom0 is mapped 1:1, while the Linux page can be spanned accross
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* multiple Xen page, it's not possible to have a mix of local and
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* foreign Xen page. Dom0 is mapped 1:1, so calling pfn_valid on a
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* foreign mfn will always return false. If the page is local we can
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* safely call the native dma_ops function, otherwise we call the xen
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* specific function.
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*/
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if (pfn_valid(pfn)) {
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if (__generic_dma_ops(hwdev)->unmap_page)
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__generic_dma_ops(hwdev)->unmap_page(hwdev, handle, size, dir, attrs);
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} else
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__xen_dma_unmap_page(hwdev, handle, size, dir, attrs);
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}
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static inline void xen_dma_sync_single_for_cpu(struct device *hwdev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir)
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{
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unsigned long pfn = PFN_DOWN(handle);
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if (pfn_valid(pfn)) {
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if (__generic_dma_ops(hwdev)->sync_single_for_cpu)
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__generic_dma_ops(hwdev)->sync_single_for_cpu(hwdev, handle, size, dir);
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} else
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__xen_dma_sync_single_for_cpu(hwdev, handle, size, dir);
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}
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static inline void xen_dma_sync_single_for_device(struct device *hwdev,
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dma_addr_t handle, size_t size, enum dma_data_direction dir)
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{
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unsigned long pfn = PFN_DOWN(handle);
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if (pfn_valid(pfn)) {
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if (__generic_dma_ops(hwdev)->sync_single_for_device)
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__generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
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} else
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__xen_dma_sync_single_for_device(hwdev, handle, size, dir);
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}
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#endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */
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