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27111a23 BS |
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_drm.h" | |
26 | #include "nouveau_usif.h" | |
2621a416 | 27 | #include "nouveau_abi16.h" |
27111a23 BS |
28 | |
29 | #include <nvif/notify.h> | |
30 | #include <nvif/unpack.h> | |
31 | #include <nvif/client.h> | |
32 | #include <nvif/event.h> | |
33 | #include <nvif/ioctl.h> | |
34 | ||
35 | struct usif_notify_p { | |
36 | struct drm_pending_event base; | |
37 | struct { | |
38 | struct drm_event base; | |
39 | u8 data[]; | |
40 | } e; | |
41 | }; | |
42 | ||
43 | struct usif_notify { | |
44 | struct list_head head; | |
45 | atomic_t enabled; | |
46 | u32 handle; | |
47 | u16 reply; | |
48 | u8 route; | |
49 | u64 token; | |
50 | struct usif_notify_p *p; | |
51 | }; | |
52 | ||
53 | static inline struct usif_notify * | |
54 | usif_notify_find(struct drm_file *filp, u32 handle) | |
55 | { | |
56 | struct nouveau_cli *cli = nouveau_cli(filp); | |
57 | struct usif_notify *ntfy; | |
58 | list_for_each_entry(ntfy, &cli->notifys, head) { | |
59 | if (ntfy->handle == handle) | |
60 | return ntfy; | |
61 | } | |
62 | return NULL; | |
63 | } | |
64 | ||
65 | static inline void | |
66 | usif_notify_dtor(struct usif_notify *ntfy) | |
67 | { | |
68 | list_del(&ntfy->head); | |
69 | kfree(ntfy); | |
70 | } | |
71 | ||
72 | int | |
73 | usif_notify(const void *header, u32 length, const void *data, u32 size) | |
74 | { | |
75 | struct usif_notify *ntfy = NULL; | |
76 | const union { | |
77 | struct nvif_notify_rep_v0 v0; | |
78 | } *rep = header; | |
79 | struct drm_device *dev; | |
80 | struct drm_file *filp; | |
81 | unsigned long flags; | |
82 | ||
83 | if (length == sizeof(rep->v0) && rep->v0.version == 0) { | |
84 | if (WARN_ON(!(ntfy = (void *)(unsigned long)rep->v0.token))) | |
85 | return NVIF_NOTIFY_DROP; | |
86 | BUG_ON(rep->v0.route != NVDRM_NOTIFY_USIF); | |
87 | } else | |
88 | if (WARN_ON(1)) | |
89 | return NVIF_NOTIFY_DROP; | |
90 | ||
91 | if (WARN_ON(!ntfy->p || ntfy->reply != (length + size))) | |
92 | return NVIF_NOTIFY_DROP; | |
93 | filp = ntfy->p->base.file_priv; | |
94 | dev = filp->minor->dev; | |
95 | ||
96 | memcpy(&ntfy->p->e.data[0], header, length); | |
97 | memcpy(&ntfy->p->e.data[length], data, size); | |
98 | switch (rep->v0.version) { | |
99 | case 0: { | |
100 | struct nvif_notify_rep_v0 *rep = (void *)ntfy->p->e.data; | |
101 | rep->route = ntfy->route; | |
102 | rep->token = ntfy->token; | |
103 | } | |
104 | break; | |
105 | default: | |
106 | BUG_ON(1); | |
107 | break; | |
108 | } | |
109 | ||
110 | spin_lock_irqsave(&dev->event_lock, flags); | |
111 | if (!WARN_ON(filp->event_space < ntfy->p->e.base.length)) { | |
112 | list_add_tail(&ntfy->p->base.link, &filp->event_list); | |
113 | filp->event_space -= ntfy->p->e.base.length; | |
114 | } | |
115 | wake_up_interruptible(&filp->event_wait); | |
116 | spin_unlock_irqrestore(&dev->event_lock, flags); | |
117 | atomic_set(&ntfy->enabled, 0); | |
118 | return NVIF_NOTIFY_DROP; | |
119 | } | |
120 | ||
121 | static int | |
122 | usif_notify_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) | |
123 | { | |
124 | struct nouveau_cli *cli = nouveau_cli(f); | |
125 | struct nvif_client *client = &cli->base; | |
126 | union { | |
127 | struct nvif_ioctl_ntfy_new_v0 v0; | |
128 | } *args = data; | |
129 | union { | |
130 | struct nvif_notify_req_v0 v0; | |
131 | } *req; | |
132 | struct usif_notify *ntfy; | |
133 | int ret; | |
134 | ||
135 | if (nvif_unpack(args->v0, 0, 0, true)) { | |
136 | if (usif_notify_find(f, args->v0.index)) | |
137 | return -EEXIST; | |
138 | } else | |
139 | return ret; | |
140 | req = data; | |
141 | ||
142 | if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL))) | |
143 | return -ENOMEM; | |
144 | atomic_set(&ntfy->enabled, 0); | |
145 | ||
146 | if (nvif_unpack(req->v0, 0, 0, true)) { | |
147 | ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply; | |
148 | ntfy->route = req->v0.route; | |
149 | ntfy->token = req->v0.token; | |
150 | req->v0.route = NVDRM_NOTIFY_USIF; | |
151 | req->v0.token = (unsigned long)(void *)ntfy; | |
152 | ret = nvif_client_ioctl(client, argv, argc); | |
153 | req->v0.token = ntfy->token; | |
154 | req->v0.route = ntfy->route; | |
155 | ntfy->handle = args->v0.index; | |
156 | } | |
157 | ||
158 | if (ret == 0) | |
159 | list_add(&ntfy->head, &cli->notifys); | |
160 | if (ret) | |
161 | kfree(ntfy); | |
162 | return ret; | |
163 | } | |
164 | ||
165 | static int | |
166 | usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) | |
167 | { | |
168 | struct nouveau_cli *cli = nouveau_cli(f); | |
169 | struct nvif_client *client = &cli->base; | |
170 | union { | |
171 | struct nvif_ioctl_ntfy_del_v0 v0; | |
172 | } *args = data; | |
173 | struct usif_notify *ntfy; | |
174 | int ret; | |
175 | ||
176 | if (nvif_unpack(args->v0, 0, 0, true)) { | |
177 | if (!(ntfy = usif_notify_find(f, args->v0.index))) | |
178 | return -ENOENT; | |
179 | } else | |
180 | return ret; | |
181 | ||
182 | ret = nvif_client_ioctl(client, argv, argc); | |
183 | if (ret == 0) | |
184 | usif_notify_dtor(ntfy); | |
185 | return ret; | |
186 | } | |
187 | ||
188 | static int | |
189 | usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) | |
190 | { | |
191 | struct nouveau_cli *cli = nouveau_cli(f); | |
192 | struct nvif_client *client = &cli->base; | |
193 | union { | |
194 | struct nvif_ioctl_ntfy_del_v0 v0; | |
195 | } *args = data; | |
196 | struct usif_notify *ntfy; | |
197 | int ret; | |
198 | ||
199 | if (nvif_unpack(args->v0, 0, 0, true)) { | |
200 | if (!(ntfy = usif_notify_find(f, args->v0.index))) | |
201 | return -ENOENT; | |
202 | } else | |
203 | return ret; | |
204 | ||
205 | if (atomic_xchg(&ntfy->enabled, 1)) | |
206 | return 0; | |
207 | ||
208 | ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL); | |
209 | if (ret = -ENOMEM, !ntfy->p) | |
210 | goto done; | |
211 | ntfy->p->base.event = &ntfy->p->e.base; | |
212 | ntfy->p->base.file_priv = f; | |
213 | ntfy->p->base.pid = current->pid; | |
214 | ntfy->p->base.destroy =(void(*)(struct drm_pending_event *))kfree; | |
215 | ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF; | |
216 | ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply; | |
217 | ||
218 | ret = nvif_client_ioctl(client, argv, argc); | |
219 | done: | |
220 | if (ret) { | |
221 | atomic_set(&ntfy->enabled, 0); | |
222 | kfree(ntfy->p); | |
223 | } | |
224 | return ret; | |
225 | } | |
226 | ||
227 | static int | |
228 | usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) | |
229 | { | |
230 | struct nouveau_cli *cli = nouveau_cli(f); | |
231 | struct nvif_client *client = &cli->base; | |
232 | union { | |
233 | struct nvif_ioctl_ntfy_put_v0 v0; | |
234 | } *args = data; | |
235 | struct usif_notify *ntfy; | |
236 | int ret; | |
237 | ||
238 | if (nvif_unpack(args->v0, 0, 0, true)) { | |
239 | if (!(ntfy = usif_notify_find(f, args->v0.index))) | |
240 | return -ENOENT; | |
241 | } else | |
242 | return ret; | |
243 | ||
244 | ret = nvif_client_ioctl(client, argv, argc); | |
245 | if (ret == 0 && atomic_xchg(&ntfy->enabled, 0)) | |
246 | kfree(ntfy->p); | |
247 | return ret; | |
248 | } | |
249 | ||
250 | struct usif_object { | |
251 | struct list_head head; | |
252 | struct list_head ntfy; | |
253 | u8 route; | |
254 | u64 token; | |
255 | }; | |
256 | ||
257 | static void | |
258 | usif_object_dtor(struct usif_object *object) | |
259 | { | |
260 | list_del(&object->head); | |
261 | kfree(object); | |
262 | } | |
263 | ||
264 | static int | |
265 | usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc) | |
266 | { | |
267 | struct nouveau_cli *cli = nouveau_cli(f); | |
268 | struct nvif_client *client = &cli->base; | |
269 | union { | |
270 | struct nvif_ioctl_new_v0 v0; | |
271 | } *args = data; | |
272 | struct usif_object *object; | |
273 | int ret; | |
274 | ||
275 | if (!(object = kmalloc(sizeof(*object), GFP_KERNEL))) | |
276 | return -ENOMEM; | |
277 | list_add(&object->head, &cli->objects); | |
278 | ||
279 | if (nvif_unpack(args->v0, 0, 0, true)) { | |
280 | object->route = args->v0.route; | |
281 | object->token = args->v0.token; | |
282 | args->v0.route = NVDRM_OBJECT_USIF; | |
283 | args->v0.token = (unsigned long)(void *)object; | |
284 | ret = nvif_client_ioctl(client, argv, argc); | |
285 | args->v0.token = object->token; | |
286 | args->v0.route = object->route; | |
287 | } | |
288 | ||
289 | if (ret) | |
290 | usif_object_dtor(object); | |
291 | return ret; | |
292 | } | |
293 | ||
294 | int | |
295 | usif_ioctl(struct drm_file *filp, void __user *user, u32 argc) | |
296 | { | |
297 | struct nouveau_cli *cli = nouveau_cli(filp); | |
298 | struct nvif_client *client = &cli->base; | |
299 | void *data = kmalloc(argc, GFP_KERNEL); | |
300 | u32 size = argc; | |
301 | union { | |
302 | struct nvif_ioctl_v0 v0; | |
303 | } *argv = data; | |
304 | struct usif_object *object; | |
305 | u8 owner; | |
306 | int ret; | |
307 | ||
308 | if (ret = -ENOMEM, !argv) | |
309 | goto done; | |
310 | if (ret = -EFAULT, copy_from_user(argv, user, size)) | |
311 | goto done; | |
312 | ||
313 | if (nvif_unpack(argv->v0, 0, 0, true)) { | |
314 | /* block access to objects not created via this interface */ | |
315 | owner = argv->v0.owner; | |
316 | argv->v0.owner = NVDRM_OBJECT_USIF; | |
317 | } else | |
318 | goto done; | |
319 | ||
2621a416 BS |
320 | /* USIF slightly abuses some return-only ioctl members in order |
321 | * to provide interoperability with the older ABI16 objects | |
322 | */ | |
27111a23 | 323 | mutex_lock(&cli->mutex); |
2621a416 BS |
324 | if (argv->v0.route) { |
325 | if (ret = -EINVAL, argv->v0.route == 0xff) | |
326 | ret = nouveau_abi16_usif(filp, argv, argc); | |
327 | if (ret) { | |
328 | mutex_unlock(&cli->mutex); | |
329 | goto done; | |
330 | } | |
331 | } | |
332 | ||
27111a23 BS |
333 | switch (argv->v0.type) { |
334 | case NVIF_IOCTL_V0_NEW: | |
27111a23 BS |
335 | ret = usif_object_new(filp, data, size, argv, argc); |
336 | break; | |
337 | case NVIF_IOCTL_V0_NTFY_NEW: | |
338 | ret = usif_notify_new(filp, data, size, argv, argc); | |
339 | break; | |
340 | case NVIF_IOCTL_V0_NTFY_DEL: | |
341 | ret = usif_notify_del(filp, data, size, argv, argc); | |
342 | break; | |
343 | case NVIF_IOCTL_V0_NTFY_GET: | |
344 | ret = usif_notify_get(filp, data, size, argv, argc); | |
345 | break; | |
346 | case NVIF_IOCTL_V0_NTFY_PUT: | |
347 | ret = usif_notify_put(filp, data, size, argv, argc); | |
348 | break; | |
349 | default: | |
350 | ret = nvif_client_ioctl(client, argv, argc); | |
351 | break; | |
352 | } | |
353 | if (argv->v0.route == NVDRM_OBJECT_USIF) { | |
354 | object = (void *)(unsigned long)argv->v0.token; | |
355 | argv->v0.route = object->route; | |
356 | argv->v0.token = object->token; | |
357 | if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) { | |
358 | list_del(&object->head); | |
359 | kfree(object); | |
360 | } | |
361 | } else { | |
362 | argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN; | |
363 | argv->v0.token = 0; | |
364 | } | |
365 | argv->v0.owner = owner; | |
366 | mutex_unlock(&cli->mutex); | |
367 | ||
368 | if (copy_to_user(user, argv, argc)) | |
369 | ret = -EFAULT; | |
370 | done: | |
371 | kfree(argv); | |
372 | return ret; | |
373 | } | |
374 | ||
375 | void | |
376 | usif_client_fini(struct nouveau_cli *cli) | |
377 | { | |
378 | struct usif_object *object, *otemp; | |
379 | struct usif_notify *notify, *ntemp; | |
380 | ||
381 | list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) { | |
382 | usif_notify_dtor(notify); | |
383 | } | |
384 | ||
385 | list_for_each_entry_safe(object, otemp, &cli->objects, head) { | |
386 | usif_object_dtor(object); | |
387 | } | |
388 | } | |
389 | ||
390 | void | |
391 | usif_client_init(struct nouveau_cli *cli) | |
392 | { | |
393 | INIT_LIST_HEAD(&cli->objects); | |
394 | INIT_LIST_HEAD(&cli->notifys); | |
395 | } |