47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_DMA_MAPPING_H
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#define _LINUX_DMA_MAPPING_H
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#ifdef CONFIG_HAS_DMA
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# error Virtio userspace code does not support CONFIG_HAS_DMA
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#endif
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enum dma_data_direction {
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DMA_BIDIRECTIONAL = 0,
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DMA_TO_DEVICE = 1,
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DMA_FROM_DEVICE = 2,
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DMA_NONE = 3,
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};
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#define dma_alloc_coherent(d, s, hp, f) ({ \
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void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
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*(hp) = (unsigned long)__dma_alloc_coherent_p; \
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__dma_alloc_coherent_p; \
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})
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#define dma_free_coherent(d, s, p, h) kfree(p)
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#define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
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#define dma_map_single(d, p, s, dir) (virt_to_phys(p))
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#define dma_map_single_attrs(d, p, s, dir, a) (virt_to_phys(p))
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#define dma_mapping_error(...) (0)
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#define dma_unmap_single(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
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#define dma_unmap_page(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
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#define sg_dma_address(sg) (0)
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#define dma_need_sync(v, a) (0)
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#define dma_unmap_single_attrs(d, a, s, r, t) do { \
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(void)(d); (void)(a); (void)(s); (void)(r); (void)(t); \
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} while (0)
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#define dma_sync_single_range_for_cpu(d, a, o, s, r) do { \
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(void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \
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} while (0)
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#define dma_sync_single_range_for_device(d, a, o, s, r) do { \
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(void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \
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} while (0)
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#define dma_max_mapping_size(...) SIZE_MAX
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#endif
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