tools/virtio/linux/dma-mapping.h

   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 #define PCI_DMA_BUS_IS_PHYS 1
  10
  11 enum dma_data_direction {
  12         DMA_BIDIRECTIONAL = 0,
  13         DMA_TO_DEVICE = 1,
  14         DMA_FROM_DEVICE = 2,
  15         DMA_NONE = 3,
  16 };
  17
  18 #define dma_alloc_coherent(d, s, hp, f) ({ \
  19         void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
  20         *(hp) = (unsigned long)__dma_alloc_coherent_p; \
  21         __dma_alloc_coherent_p; \
  22 })
  23
  24 #define dma_free_coherent(d, s, p, h) kfree(p)
  25
  26 #define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
  27
  28 #define dma_map_single(d, p, s, dir) (virt_to_phys(p))
  29 #define dma_mapping_error(...) (0)
  30
  31 #define dma_unmap_single(...) do { } while (0)
  32 #define dma_unmap_page(...) do { } while (0)
  33
  34 #endif