2 * Copyright (c) 2018-2019 François Tigeot <ftigeot@wolfpond.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #ifndef LINUX_DMA_BUF_H
28 #define LINUX_DMA_BUF_H
30 #include <linux/err.h>
31 #include <linux/scatterlist.h>
32 #include <linux/list.h>
33 #include <linux/dma-mapping.h>
35 #include <linux/fence.h>
36 #include <linux/wait.h>
39 struct sg_table * (*map_dma_buf)(struct dma_buf_attachment *,
40 enum dma_data_direction);
41 void (*unmap_dma_buf)(struct dma_buf_attachment *,
43 enum dma_data_direction);
44 void (*release)(struct dma_buf *);
45 void *(*kmap)(struct dma_buf *, unsigned long);
46 void *(*kmap_atomic)(struct dma_buf *, unsigned long);
47 void (*kunmap)(struct dma_buf *, unsigned long, void *);
48 void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
49 int (*mmap)(struct dma_buf *, struct vm_area_struct *vma);
50 void *(*vmap)(struct dma_buf *);
51 void (*vunmap)(struct dma_buf *, void *vaddr);
52 int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
53 int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
57 struct reservation_object *resv;
59 const struct dma_buf_ops *ops;
63 struct dma_buf_attachment {
64 struct dma_buf *dmabuf;
68 struct dma_buf_export_info {
69 const struct dma_buf_ops *ops;
75 struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info);
77 #define DEFINE_DMA_BUF_EXPORT_INFO(name) \
78 struct dma_buf_export_info name = { \
81 struct sg_table * dma_buf_map_attachment(struct dma_buf_attachment *,
82 enum dma_data_direction);
83 void dma_buf_unmap_attachment(struct dma_buf_attachment *,
84 struct sg_table *, enum dma_data_direction);
86 static inline struct dma_buf_attachment *
87 dma_buf_attach(struct dma_buf *dmabuf, struct device *dev)
89 /* XXX: this function is a stub */
90 struct dma_buf_attachment *attach;
92 attach = kmalloc(sizeof(struct dma_buf_attachment), M_DRM, M_WAITOK | M_ZERO);
99 #endif /* LINUX_DMA_BUF_H */