88 lines
3.2 KiB
C
88 lines
3.2 KiB
C
#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-attrs.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, struct dma_attrs *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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struct dma_attrs *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,
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struct dma_attrs *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,
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struct dma_attrs *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, struct dma_attrs *attrs)
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{
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bool local = PFN_DOWN(dev_addr) == page_to_pfn(page);
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/* Dom0 is mapped 1:1, so if pfn == mfn the page is local otherwise
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* is a foreign page grant-mapped in dom0. If the page is local we
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* can safely call the native dma_ops function, otherwise we call
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* the xen specific function. */
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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,
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struct dma_attrs *attrs)
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{
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unsigned long pfn = PFN_DOWN(handle);
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/* Dom0 is mapped 1:1, so calling pfn_valid on a foreign mfn will
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* always return false. If the page is local we can safely call the
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* native dma_ops function, otherwise we call the xen specific
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* function. */
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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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