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
43 usif_object_dtor(struct usif_object *object)
44 {
45 	list_del(&object->head);
46 	kfree(object);
47 }
48 
49 static int
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
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 	case NVIF_IOCTL_V0_NTFY_NEW:
155 	case NVIF_IOCTL_V0_NTFY_DEL:
156 	case NVIF_IOCTL_V0_NTFY_GET:
157 	case NVIF_IOCTL_V0_NTFY_PUT:
158 		ret = -ENOSYS;
159 		break;
160 	default:
161 		ret = nvif_client_ioctl(client, argv, argc);
162 		break;
163 	}
164 	if (argv->v0.route == NVDRM_OBJECT_USIF) {
165 		object = (void *)(unsigned long)argv->v0.token;
166 		argv->v0.route = object->route;
167 		argv->v0.token = object->token;
168 		if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) {
169 			list_del(&object->head);
170 			kfree(object);
171 		}
172 	} else {
173 		argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN;
174 		argv->v0.token = 0;
175 	}
176 	argv->v0.owner = owner;
177 	mutex_unlock(&cli->mutex);
178 
179 	if (copy_to_user(user, argv, argc))
180 		ret = -EFAULT;
181 done:
182 	kfree(argv);
183 	return ret;
184 }
185 
186 void
187 usif_client_fini(struct nouveau_cli *cli)
188 {
189 	struct usif_object *object, *otemp;
190 
191 	list_for_each_entry_safe(object, otemp, &cli->objects, head) {
192 		usif_object_dtor(object);
193 	}
194 }
195 
196 void
197 usif_client_init(struct nouveau_cli *cli)
198 {
199 	INIT_LIST_HEAD(&cli->objects);
200 }
201