1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /**************************************************************************
3  *
4  * Copyright 2013 VMware, Inc., Palo Alto, CA., USA
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 "ttm_object.h"
35 #include <linux/dma-buf.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 dma_buf_attachment *attach)
44 {
45 	return -ENOSYS;
46 }
47 
48 static void vmw_prime_map_detach(struct dma_buf *dma_buf,
49 				 struct dma_buf_attachment *attach)
50 {
51 }
52 
53 static struct sg_table *vmw_prime_map_dma_buf(struct dma_buf_attachment *attach,
54 					      enum dma_data_direction dir)
55 {
56 	return ERR_PTR(-ENOSYS);
57 }
58 
59 static void vmw_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
60 				    struct sg_table *sgb,
61 				    enum dma_data_direction dir)
62 {
63 }
64 
65 static void *vmw_prime_dmabuf_vmap(struct dma_buf *dma_buf)
66 {
67 	return NULL;
68 }
69 
70 static void vmw_prime_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
71 {
72 }
73 
74 static void *vmw_prime_dmabuf_kmap(struct dma_buf *dma_buf,
75 		unsigned long page_num)
76 {
77 	return NULL;
78 }
79 
80 static void vmw_prime_dmabuf_kunmap(struct dma_buf *dma_buf,
81 		unsigned long page_num, void *addr)
82 {
83 
84 }
85 
86 static int vmw_prime_dmabuf_mmap(struct dma_buf *dma_buf,
87 				 struct vm_area_struct *vma)
88 {
89 	WARN_ONCE(true, "Attempted use of dmabuf mmap. Bad.\n");
90 	return -ENOSYS;
91 }
92 
93 const struct dma_buf_ops vmw_prime_dmabuf_ops =  {
94 	.attach = vmw_prime_map_attach,
95 	.detach = vmw_prime_map_detach,
96 	.map_dma_buf = vmw_prime_map_dma_buf,
97 	.unmap_dma_buf = vmw_prime_unmap_dma_buf,
98 	.release = NULL,
99 	.map = vmw_prime_dmabuf_kmap,
100 	.unmap = vmw_prime_dmabuf_kunmap,
101 	.mmap = vmw_prime_dmabuf_mmap,
102 	.vmap = vmw_prime_dmabuf_vmap,
103 	.vunmap = vmw_prime_dmabuf_vunmap,
104 };
105 
106 int vmw_prime_fd_to_handle(struct drm_device *dev,
107 			   struct drm_file *file_priv,
108 			   int fd, u32 *handle)
109 {
110 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
111 
112 	return ttm_prime_fd_to_handle(tfile, fd, handle);
113 }
114 
115 int vmw_prime_handle_to_fd(struct drm_device *dev,
116 			   struct drm_file *file_priv,
117 			   uint32_t handle, uint32_t flags,
118 			   int *prime_fd)
119 {
120 	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
121 
122 	return ttm_prime_handle_to_fd(tfile, handle, flags, prime_fd);
123 }
124