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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
xen: introduce xen_dma_map/unmap_page and xen_dma_sync_single_for_cpu/device
Introduce xen_dma_map_page, xen_dma_unmap_page,
xen_dma_sync_single_for_cpu and xen_dma_sync_single_for_device.
They have empty implementations on x86 and ia64 but they call the
corresponding platform dma_ops function on arm and arm64.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Changes in v9:
- xen_dma_map_page return void, avoid page_to_phys.
+81
+28
arch/arm/include/asm/xen/page-coherent.h
+28
arch/arm/include/asm/xen/page-coherent.h
···
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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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unsigned long offset, size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs)
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{
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__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
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}
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+
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static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
30
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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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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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}
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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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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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}
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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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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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}
22
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#endif /* _ASM_ARM_XEN_PAGE_COHERENT_H */
+25
arch/arm64/include/asm/xen/page-coherent.h
+25
arch/arm64/include/asm/xen/page-coherent.h
···
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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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unsigned long offset, size_t size, enum dma_data_direction dir,
24
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struct dma_attrs *attrs)
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{
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__generic_dma_ops(hwdev)->map_page(hwdev, page, offset, size, dir, attrs);
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}
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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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__generic_dma_ops(hwdev)->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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__generic_dma_ops(hwdev)->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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__generic_dma_ops(hwdev)->sync_single_for_device(hwdev, handle, size, dir);
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}
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#endif /* _ASM_ARM64_XEN_PAGE_COHERENT_H */
+14
arch/ia64/include/asm/xen/page-coherent.h
+14
arch/ia64/include/asm/xen/page-coherent.h
···
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free_pages((unsigned long) cpu_addr, get_order(size));
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}
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static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
25
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unsigned long offset, size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs) { }
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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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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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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) { }
37
+
24
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#endif /* _ASM_IA64_XEN_PAGE_COHERENT_H */
+14
arch/x86/include/asm/xen/page-coherent.h
+14
arch/x86/include/asm/xen/page-coherent.h
···
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free_pages((unsigned long) cpu_addr, get_order(size));
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}
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+
static inline void xen_dma_map_page(struct device *hwdev, struct page *page,
25
+
unsigned long offset, size_t size, enum dma_data_direction dir,
26
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struct dma_attrs *attrs) { }
27
+
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static inline void xen_dma_unmap_page(struct device *hwdev, dma_addr_t handle,
29
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size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs) { }
31
+
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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) { }
34
+
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static inline void xen_dma_sync_single_for_device(struct device *hwdev,
36
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dma_addr_t handle, size_t size, enum dma_data_direction dir) { }
37
+
24
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#endif /* _ASM_X86_XEN_PAGE_COHERENT_H */