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| /* SPDX-License-Identifier: GPL-2.0 */
| #ifndef _LINUX_DMA_MAPPING_H
| #define _LINUX_DMA_MAPPING_H
|
| #ifdef CONFIG_HAS_DMA
| # error Virtio userspace code does not support CONFIG_HAS_DMA
| #endif
|
| enum dma_data_direction {
| DMA_BIDIRECTIONAL = 0,
| DMA_TO_DEVICE = 1,
| DMA_FROM_DEVICE = 2,
| DMA_NONE = 3,
| };
|
| #define dma_alloc_coherent(d, s, hp, f) ({ \
| void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
| *(hp) = (unsigned long)__dma_alloc_coherent_p; \
| __dma_alloc_coherent_p; \
| })
|
| #define dma_free_coherent(d, s, p, h) kfree(p)
|
| #define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
|
| #define dma_map_single(d, p, s, dir) (virt_to_phys(p))
| #define dma_mapping_error(...) (0)
|
| #define dma_unmap_single(...) do { } while (0)
| #define dma_unmap_page(...) do { } while (0)
|
| #endif
|
|
