1 /*
2 * Copyright 2014 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs <bskeggs@redhat.com>
23 */
24
25 #include "nouveau_drv.h"
26 #include "nouveau_usif.h"
27 #include "nouveau_abi16.h"
28
29 #include <nvif/unpack.h>
30 #include <nvif/client.h>
31 #include <nvif/ioctl.h>
32
33 #include <nvif/class.h>
34 #include <nvif/cl0080.h>
35
36 struct usif_object {
37 struct list_head head;
38 u8 route;
39 u64 token;
40 };
41
42 static void
usif_object_dtor(struct usif_object * object)43 usif_object_dtor(struct usif_object *object)
44 {
45 list_del(&object->head);
46 kfree(object);
47 }
48
49 static int
usif_object_new(struct drm_file * f,void * data,u32 size,void * argv,u32 argc,bool parent_abi16)50 usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc, bool parent_abi16)
51 {
52 struct nouveau_cli *cli = nouveau_cli(f);
53 struct nvif_client *client = &cli->base;
54 union {
55 struct nvif_ioctl_new_v0 v0;
56 } *args = data;
57 struct usif_object *object;
58 int ret = -ENOSYS;
59
60 if ((ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true)))
61 return ret;
62
63 switch (args->v0.oclass) {
64 case NV_DMA_FROM_MEMORY:
65 case NV_DMA_TO_MEMORY:
66 case NV_DMA_IN_MEMORY:
67 return -EINVAL;
68 case NV_DEVICE: {
69 union {
70 struct nv_device_v0 v0;
71 } *args = data;
72
73 if ((ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false)))
74 return ret;
75
76 args->v0.priv = false;
77 break;
78 }
79 default:
80 if (!parent_abi16)
81 return -EINVAL;
82 break;
83 }
84
85 if (!(object = kmalloc(sizeof(*object), GFP_KERNEL)))
86 return -ENOMEM;
87 list_add(&object->head, &cli->objects);
88
89 object->route = args->v0.route;
90 object->token = args->v0.token;
91 args->v0.route = NVDRM_OBJECT_USIF;
92 args->v0.token = (unsigned long)(void *)object;
93 ret = nvif_client_ioctl(client, argv, argc);
94 if (ret) {
95 usif_object_dtor(object);
96 return ret;
97 }
98
99 args->v0.token = object->token;
100 args->v0.route = object->route;
101 return 0;
102 }
103
104 int
usif_ioctl(struct drm_file * filp,void __user * user,u32 argc)105 usif_ioctl(struct drm_file *filp, void __user *user, u32 argc)
106 {
107 struct nouveau_cli *cli = nouveau_cli(filp);
108 struct nvif_client *client = &cli->base;
109 void *data = kmalloc(argc, GFP_KERNEL);
110 u32 size = argc;
111 union {
112 struct nvif_ioctl_v0 v0;
113 } *argv = data;
114 struct usif_object *object;
115 bool abi16 = false;
116 u8 owner;
117 int ret;
118
119 if (ret = -ENOMEM, !argv)
120 goto done;
121 if (ret = -EFAULT, copy_from_user(argv, user, size))
122 goto done;
123
124 if (!(ret = nvif_unpack(-ENOSYS, &data, &size, argv->v0, 0, 0, true))) {
125 /* block access to objects not created via this interface */
126 owner = argv->v0.owner;
127 if (argv->v0.object == 0ULL &&
128 argv->v0.type != NVIF_IOCTL_V0_DEL)
129 argv->v0.owner = NVDRM_OBJECT_ANY; /* except client */
130 else
131 argv->v0.owner = NVDRM_OBJECT_USIF;
132 } else
133 goto done;
134
135 /* USIF slightly abuses some return-only ioctl members in order
136 * to provide interoperability with the older ABI16 objects
137 */
138 mutex_lock(&cli->mutex);
139 if (argv->v0.route) {
140 if (ret = -EINVAL, argv->v0.route == 0xff)
141 ret = nouveau_abi16_usif(filp, argv, argc);
142 if (ret) {
143 mutex_unlock(&cli->mutex);
144 goto done;
145 }
146
147 abi16 = true;
148 }
149
150 switch (argv->v0.type) {
151 case NVIF_IOCTL_V0_NEW:
152 ret = usif_object_new(filp, data, size, argv, argc, abi16);
153 break;
154 default:
155 ret = nvif_client_ioctl(client, argv, argc);
156 break;
157 }
158 if (argv->v0.route == NVDRM_OBJECT_USIF) {
159 object = (void *)(unsigned long)argv->v0.token;
160 argv->v0.route = object->route;
161 argv->v0.token = object->token;
162 if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) {
163 list_del(&object->head);
164 kfree(object);
165 }
166 } else {
167 argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN;
168 argv->v0.token = 0;
169 }
170 argv->v0.owner = owner;
171 mutex_unlock(&cli->mutex);
172
173 if (copy_to_user(user, argv, argc))
174 ret = -EFAULT;
175 done:
176 kfree(argv);
177 return ret;
178 }
179
180 void
usif_client_fini(struct nouveau_cli * cli)181 usif_client_fini(struct nouveau_cli *cli)
182 {
183 struct usif_object *object, *otemp;
184
185 list_for_each_entry_safe(object, otemp, &cli->objects, head) {
186 usif_object_dtor(object);
187 }
188 }
189
190 void
usif_client_init(struct nouveau_cli * cli)191 usif_client_init(struct nouveau_cli *cli)
192 {
193 INIT_LIST_HEAD(&cli->objects);
194 }
195