c9b6180dbf
xen_dma_map_page uses a different and more complicated check for foreign pages than the other three cache maintainance helpers. Switch it to the simpler pfn_valid method a well, and document the scheme with a single improved comment in xen_dma_map_page. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
84 lines
2.9 KiB
C
84 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _XEN_ARM_PAGE_COHERENT_H
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#define _XEN_ARM_PAGE_COHERENT_H
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#include <linux/dma-mapping.h>
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#include <asm/page.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 dma_direct_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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dma_direct_free(hwdev, size, cpu_addr, dma_handle, 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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dma_direct_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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dma_direct_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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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 pfn = PFN_DOWN(dev_addr);
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/*
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* Dom0 is mapped 1:1, and while the Linux page can span across multiple
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* Xen pages, it is not possible for it to contain a mix of local and
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* foreign Xen pages. Calling pfn_valid on a foreign mfn will always
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* return false, so if pfn_valid returns true the pages is local and we
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* can use the native dma-direct functions, otherwise we call the Xen
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* specific version.
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*/
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if (pfn_valid(pfn))
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dma_direct_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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if (pfn_valid(pfn))
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dma_direct_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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#endif /* _XEN_ARM_PAGE_COHERENT_H */
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