1 /**************************************************************************
2  *
3  * Copyright © 2013 VMware, Inc., Palo Alto, CA., USA
4  * All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27 /*
28  * Authors:
29  *     Thomas Hellstrom <thellstrom@vmware.com>
30  *
31  */
32 
33 #include "vmwgfx_drv.h"
34 #include <linux/dma-buf.h>
35 #include <drm/ttm/ttm_object.h>
36 
37 /*
38  * DMA-BUF attach- and mapping methods. No need to implement
39  * these until we have other virtual devices use them.
40  */
41 
42 static int vmw_prime_map_attach(struct dma_buf *dma_buf,
43 				struct device *target_dev,
44 				struct dma_buf_attachment *attach)
45 {
46 	return -ENOSYS;
47 }
48 
49 static void vmw_prime_map_detach(struct dma_buf *dma_buf,
50 				 struct dma_buf_attachment *attach)
51 {
52 }
53 
54 static struct sg_table *vmw_prime_map_dma_buf(struct dma_buf_attachment *attach,
55 					      enum dma_data_direction dir)
56 {
57 	return ERR_PTR(-ENOSYS);
58 }
59 
60 static void vmw_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
61 				    struct sg_table *sgb,
62 				    enum dma_data_direction dir)
63 {
64 }
65 
66 static void *vmw_prime_dmabuf_vmap(struct dma_buf *dma_buf)
67 {
68 	return NULL;
69 }
70 
71 static void vmw_prime_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
72 {
73 }
74 
75 static void *vmw_prime_dmabuf_kmap_atomic(struct dma_buf *dma_buf,
76 		unsigned long page_num)
77 {
78 	return NULL;
79 }
80 
81 static void vmw_prime_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,
82 		unsigned long page_num, void *addr)
83 {
84 
85 }
86 static void *vmw_prime_dmabuf_kmap(struct dma_buf *dma_buf,
87 		unsigned long page_num)
88 {
89 	return NULL;
90 }
91 
92 static void vmw_prime_dmabuf_kunmap(struct dma_buf *dma_buf,
93 		unsigned long page_num, void *addr)
94 {
95 
96 }
97 
98 static int vmw_prime_dmabuf_mmap(struct dma_buf *dma_buf,
99 				 struct vm_area_struct *vma)
100 {
101 	WARN_ONCE(true, "Attempted use of dmabuf mmap. Bad.\n");
102 	return -ENOSYS;
103 }
104 
105 const struct dma_buf_ops vmw_prime_dmabuf_ops =  {
106 	.attach = vmw_prime_map_attach,
107 	.detach = vmw_prime_map_detach,
108 	.map_dma_buf = vmw_prime_map_dma_buf,
109 	.unmap_dma_buf = vmw_prime_unmap_dma_buf,
110 	.release = NULL,
111 	.kmap = vmw_prime_dmabuf_kmap,
112 	.kmap_atomic = vmw_prime_dmabuf_kmap_atomic,
113 	.kunmap = vmw_prime_dmabuf_kunmap,
114 	.kunmap_atomic = vmw_prime_dmabuf_kunmap_atomic,
115 	.mmap = vmw_prime_dmabuf_mmap,
116 	.vmap = vmw_prime_dmabuf_vmap,
117 	.vunmap = vmw_prime_dmabuf_vunmap,
118 };
119 
120 int vmw_prime_fd_to_handle(struct drm_device *dev,
121 			   struct drm_file *file_priv,
122 			   int fd, u32 *handle)
123 {
124 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
125 
126 	return ttm_prime_fd_to_handle(tfile, fd, handle);
127 }
128 
129 int vmw_prime_handle_to_fd(struct drm_device *dev,
130 			   struct drm_file *file_priv,
131 			   uint32_t handle, uint32_t flags,
132 			   int *prime_fd)
133 {
134 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
135 
136 	return ttm_prime_handle_to_fd(tfile, handle, flags, prime_fd);
137 }
138