root/tools/virtio/linux/dma-mapping.h

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INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_DMA_MAPPING_H
   3 #define _LINUX_DMA_MAPPING_H
   4 
   5 #ifdef CONFIG_HAS_DMA
   6 # error Virtio userspace code does not support CONFIG_HAS_DMA
   7 #endif
   8 
   9 enum dma_data_direction {
  10         DMA_BIDIRECTIONAL = 0,
  11         DMA_TO_DEVICE = 1,
  12         DMA_FROM_DEVICE = 2,
  13         DMA_NONE = 3,
  14 };
  15 
  16 #define dma_alloc_coherent(d, s, hp, f) ({ \
  17         void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
  18         *(hp) = (unsigned long)__dma_alloc_coherent_p; \
  19         __dma_alloc_coherent_p; \
  20 })
  21 
  22 #define dma_free_coherent(d, s, p, h) kfree(p)
  23 
  24 #define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
  25 
  26 #define dma_map_single(d, p, s, dir) (virt_to_phys(p))
  27 #define dma_mapping_error(...) (0)
  28 
  29 #define dma_unmap_single(...) do { } while (0)
  30 #define dma_unmap_page(...) do { } while (0)
  31 
  32 #define dma_max_mapping_size(...) SIZE_MAX
  33 
  34 #endif
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