LXR linux/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
   9enum 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
  35