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>
38 #include <linux/slab.h>
41 struct dma_buf_attachment;
44 struct sg_table * (*map_dma_buf)(struct dma_buf_attachment *,
45 enum dma_data_direction);
46 void (*unmap_dma_buf)(struct dma_buf_attachment *,
48 enum dma_data_direction);
49 void (*release)(struct dma_buf *);
50 void *(*kmap)(struct dma_buf *, unsigned long);
51 void *(*kmap_atomic)(struct dma_buf *, unsigned long);
52 void (*kunmap)(struct dma_buf *, unsigned long, void *);
53 void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
54 int (*mmap)(struct dma_buf *, struct vm_area_struct *vma);
55 void *(*vmap)(struct dma_buf *);
56 void (*vunmap)(struct dma_buf *, void *vaddr);
57 int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
58 int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
59 int (*attach)(struct dma_buf *, struct device *, struct dma_buf_attachment *);
60 void (*detach)(struct dma_buf *, struct dma_buf_attachment *);
64 struct reservation_object *resv;
66 const struct dma_buf_ops *ops;
70 struct dma_buf_attachment {
71 struct dma_buf *dmabuf;
76 struct dma_buf_export_info {
77 const struct dma_buf_ops *ops;
81 struct reservation_object *resv;
84 struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info);
86 #define DEFINE_DMA_BUF_EXPORT_INFO(name) \
87 struct dma_buf_export_info name = { \
90 struct sg_table * dma_buf_map_attachment(struct dma_buf_attachment *,
91 enum dma_data_direction);
92 void dma_buf_unmap_attachment(struct dma_buf_attachment *,
93 struct sg_table *, enum dma_data_direction);
95 static inline struct dma_buf_attachment *
96 dma_buf_attach(struct dma_buf *dmabuf, struct device *dev)
98 /* XXX: this function is a stub */
99 struct dma_buf_attachment *attach;
101 attach = kmalloc(sizeof(struct dma_buf_attachment), M_DRM, M_WAITOK | M_ZERO);
106 #endif /* LINUX_DMA_BUF_H */