xref: /openbmc/linux/drivers/gpu/drm/nouveau/nvif/object.c (revision 68198dca)
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 <nvif/object.h>
26 #include <nvif/client.h>
27 #include <nvif/driver.h>
28 #include <nvif/ioctl.h>
29 
30 int
31 nvif_object_ioctl(struct nvif_object *object, void *data, u32 size, void **hack)
32 {
33 	struct nvif_client *client = object->client;
34 	union {
35 		struct nvif_ioctl_v0 v0;
36 	} *args = data;
37 
38 	if (size >= sizeof(*args) && args->v0.version == 0) {
39 		if (object != &client->object)
40 			args->v0.object = nvif_handle(object);
41 		else
42 			args->v0.object = 0;
43 		args->v0.owner = NVIF_IOCTL_V0_OWNER_ANY;
44 	} else
45 		return -ENOSYS;
46 
47 	return client->driver->ioctl(client->object.priv, client->super,
48 				     data, size, hack);
49 }
50 
51 void
52 nvif_object_sclass_put(struct nvif_sclass **psclass)
53 {
54 	kfree(*psclass);
55 	*psclass = NULL;
56 }
57 
58 int
59 nvif_object_sclass_get(struct nvif_object *object, struct nvif_sclass **psclass)
60 {
61 	struct {
62 		struct nvif_ioctl_v0 ioctl;
63 		struct nvif_ioctl_sclass_v0 sclass;
64 	} *args = NULL;
65 	int ret, cnt = 0, i;
66 	u32 size;
67 
68 	while (1) {
69 		size = sizeof(*args) + cnt * sizeof(args->sclass.oclass[0]);
70 		if (!(args = kmalloc(size, GFP_KERNEL)))
71 			return -ENOMEM;
72 		args->ioctl.version = 0;
73 		args->ioctl.type = NVIF_IOCTL_V0_SCLASS;
74 		args->sclass.version = 0;
75 		args->sclass.count = cnt;
76 
77 		ret = nvif_object_ioctl(object, args, size, NULL);
78 		if (ret == 0 && args->sclass.count <= cnt)
79 			break;
80 		cnt = args->sclass.count;
81 		kfree(args);
82 		if (ret != 0)
83 			return ret;
84 	}
85 
86 	*psclass = kzalloc(sizeof(**psclass) * args->sclass.count, GFP_KERNEL);
87 	if (*psclass) {
88 		for (i = 0; i < args->sclass.count; i++) {
89 			(*psclass)[i].oclass = args->sclass.oclass[i].oclass;
90 			(*psclass)[i].minver = args->sclass.oclass[i].minver;
91 			(*psclass)[i].maxver = args->sclass.oclass[i].maxver;
92 		}
93 		ret = args->sclass.count;
94 	} else {
95 		ret = -ENOMEM;
96 	}
97 
98 	kfree(args);
99 	return ret;
100 }
101 
102 u32
103 nvif_object_rd(struct nvif_object *object, int size, u64 addr)
104 {
105 	struct {
106 		struct nvif_ioctl_v0 ioctl;
107 		struct nvif_ioctl_rd_v0 rd;
108 	} args = {
109 		.ioctl.type = NVIF_IOCTL_V0_RD,
110 		.rd.size = size,
111 		.rd.addr = addr,
112 	};
113 	int ret = nvif_object_ioctl(object, &args, sizeof(args), NULL);
114 	if (ret) {
115 		/*XXX: warn? */
116 		return 0;
117 	}
118 	return args.rd.data;
119 }
120 
121 void
122 nvif_object_wr(struct nvif_object *object, int size, u64 addr, u32 data)
123 {
124 	struct {
125 		struct nvif_ioctl_v0 ioctl;
126 		struct nvif_ioctl_wr_v0 wr;
127 	} args = {
128 		.ioctl.type = NVIF_IOCTL_V0_WR,
129 		.wr.size = size,
130 		.wr.addr = addr,
131 		.wr.data = data,
132 	};
133 	int ret = nvif_object_ioctl(object, &args, sizeof(args), NULL);
134 	if (ret) {
135 		/*XXX: warn? */
136 	}
137 }
138 
139 int
140 nvif_object_mthd(struct nvif_object *object, u32 mthd, void *data, u32 size)
141 {
142 	struct {
143 		struct nvif_ioctl_v0 ioctl;
144 		struct nvif_ioctl_mthd_v0 mthd;
145 	} *args;
146 	u8 stack[128];
147 	int ret;
148 
149 	if (sizeof(*args) + size > sizeof(stack)) {
150 		if (!(args = kmalloc(sizeof(*args) + size, GFP_KERNEL)))
151 			return -ENOMEM;
152 	} else {
153 		args = (void *)stack;
154 	}
155 	args->ioctl.version = 0;
156 	args->ioctl.type = NVIF_IOCTL_V0_MTHD;
157 	args->mthd.version = 0;
158 	args->mthd.method = mthd;
159 
160 	memcpy(args->mthd.data, data, size);
161 	ret = nvif_object_ioctl(object, args, sizeof(*args) + size, NULL);
162 	memcpy(data, args->mthd.data, size);
163 	if (args != (void *)stack)
164 		kfree(args);
165 	return ret;
166 }
167 
168 void
169 nvif_object_unmap_handle(struct nvif_object *object)
170 {
171 	struct {
172 		struct nvif_ioctl_v0 ioctl;
173 		struct nvif_ioctl_unmap unmap;
174 	} args = {
175 		.ioctl.type = NVIF_IOCTL_V0_UNMAP,
176 	};
177 
178 	nvif_object_ioctl(object, &args, sizeof(args), NULL);
179 }
180 
181 int
182 nvif_object_map_handle(struct nvif_object *object, void *argv, u32 argc,
183 		       u64 *handle, u64 *length)
184 {
185 	struct {
186 		struct nvif_ioctl_v0 ioctl;
187 		struct nvif_ioctl_map_v0 map;
188 	} *args;
189 	u32 argn = sizeof(*args) + argc;
190 	int ret, maptype;
191 
192 	if (!(args = kzalloc(argn, GFP_KERNEL)))
193 		return -ENOMEM;
194 	args->ioctl.type = NVIF_IOCTL_V0_MAP;
195 	memcpy(args->map.data, argv, argc);
196 
197 	ret = nvif_object_ioctl(object, args, argn, NULL);
198 	*handle = args->map.handle;
199 	*length = args->map.length;
200 	maptype = args->map.type;
201 	kfree(args);
202 	return ret ? ret : (maptype == NVIF_IOCTL_MAP_V0_IO);
203 }
204 
205 void
206 nvif_object_unmap(struct nvif_object *object)
207 {
208 	struct nvif_client *client = object->client;
209 	if (object->map.ptr) {
210 		if (object->map.size) {
211 			client->driver->unmap(client, object->map.ptr,
212 						      object->map.size);
213 			object->map.size = 0;
214 		}
215 		object->map.ptr = NULL;
216 		nvif_object_unmap_handle(object);
217 	}
218 }
219 
220 int
221 nvif_object_map(struct nvif_object *object, void *argv, u32 argc)
222 {
223 	struct nvif_client *client = object->client;
224 	u64 handle, length;
225 	int ret = nvif_object_map_handle(object, argv, argc, &handle, &length);
226 	if (ret >= 0) {
227 		if (ret) {
228 			object->map.ptr = client->driver->map(client,
229 							      handle,
230 							      length);
231 			if (ret = -ENOMEM, object->map.ptr) {
232 				object->map.size = length;
233 				return 0;
234 			}
235 		} else {
236 			object->map.ptr = (void *)(unsigned long)handle;
237 			return 0;
238 		}
239 		nvif_object_unmap_handle(object);
240 	}
241 	return ret;
242 }
243 
244 void
245 nvif_object_fini(struct nvif_object *object)
246 {
247 	struct {
248 		struct nvif_ioctl_v0 ioctl;
249 		struct nvif_ioctl_del del;
250 	} args = {
251 		.ioctl.type = NVIF_IOCTL_V0_DEL,
252 	};
253 
254 	if (!object->client)
255 		return;
256 
257 	nvif_object_unmap(object);
258 	nvif_object_ioctl(object, &args, sizeof(args), NULL);
259 	object->client = NULL;
260 }
261 
262 int
263 nvif_object_init(struct nvif_object *parent, u32 handle, s32 oclass,
264 		 void *data, u32 size, struct nvif_object *object)
265 {
266 	struct {
267 		struct nvif_ioctl_v0 ioctl;
268 		struct nvif_ioctl_new_v0 new;
269 	} *args;
270 	int ret = 0;
271 
272 	object->client = NULL;
273 	object->handle = handle;
274 	object->oclass = oclass;
275 	object->map.ptr = NULL;
276 	object->map.size = 0;
277 
278 	if (parent) {
279 		if (!(args = kmalloc(sizeof(*args) + size, GFP_KERNEL))) {
280 			nvif_object_fini(object);
281 			return -ENOMEM;
282 		}
283 
284 		args->ioctl.version = 0;
285 		args->ioctl.type = NVIF_IOCTL_V0_NEW;
286 		args->new.version = 0;
287 		args->new.route = parent->client->route;
288 		args->new.token = nvif_handle(object);
289 		args->new.object = nvif_handle(object);
290 		args->new.handle = handle;
291 		args->new.oclass = oclass;
292 
293 		memcpy(args->new.data, data, size);
294 		ret = nvif_object_ioctl(parent, args, sizeof(*args) + size,
295 					&object->priv);
296 		memcpy(data, args->new.data, size);
297 		kfree(args);
298 		if (ret == 0)
299 			object->client = parent->client;
300 	}
301 
302 	if (ret)
303 		nvif_object_fini(object);
304 	return ret;
305 }
306