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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"
27#include "nouveau_abi16.h"
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
35struct usif_notify_p {
36 struct drm_pending_event base;
37 struct {
38 struct drm_event base;
39 u8 data[];
40 } e;
41};
42
43struct 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
53static inline struct usif_notify *
54usif_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
65static inline void
66usif_notify_dtor(struct usif_notify *ntfy)
67{
68 list_del(&ntfy->head);
69 kfree(ntfy);
70}
71
72int
73usif_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
121static int
122usif_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 = -ENOSYS;
134
135 if (!(ret = nvif_unpack(ret, &data, &size, 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 ret = -ENOSYS;
142
143 if (!(ntfy = kmalloc(sizeof(*ntfy), GFP_KERNEL)))
144 return -ENOMEM;
145 atomic_set(&ntfy->enabled, 0);
146
147 if (!(ret = nvif_unpack(ret, &data, &size, req->v0, 0, 0, true))) {
148 ntfy->reply = sizeof(struct nvif_notify_rep_v0) + req->v0.reply;
149 ntfy->route = req->v0.route;
150 ntfy->token = req->v0.token;
151 req->v0.route = NVDRM_NOTIFY_USIF;
152 req->v0.token = (unsigned long)(void *)ntfy;
153 ret = nvif_client_ioctl(client, argv, argc);
154 req->v0.token = ntfy->token;
155 req->v0.route = ntfy->route;
156 ntfy->handle = args->v0.index;
157 }
158
159 if (ret == 0)
160 list_add(&ntfy->head, &cli->notifys);
161 if (ret)
162 kfree(ntfy);
163 return ret;
164}
165
166static int
167usif_notify_del(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
168{
169 struct nouveau_cli *cli = nouveau_cli(f);
170 struct nvif_client *client = &cli->base;
171 union {
172 struct nvif_ioctl_ntfy_del_v0 v0;
173 } *args = data;
174 struct usif_notify *ntfy;
175 int ret = -ENOSYS;
176
177 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
178 if (!(ntfy = usif_notify_find(f, args->v0.index)))
179 return -ENOENT;
180 } else
181 return ret;
182
183 ret = nvif_client_ioctl(client, argv, argc);
184 if (ret == 0)
185 usif_notify_dtor(ntfy);
186 return ret;
187}
188
189static int
190usif_notify_get(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
191{
192 struct nouveau_cli *cli = nouveau_cli(f);
193 struct nvif_client *client = &cli->base;
194 union {
195 struct nvif_ioctl_ntfy_del_v0 v0;
196 } *args = data;
197 struct usif_notify *ntfy;
198 int ret = -ENOSYS;
199
200 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
201 if (!(ntfy = usif_notify_find(f, args->v0.index)))
202 return -ENOENT;
203 } else
204 return ret;
205
206 if (atomic_xchg(&ntfy->enabled, 1))
207 return 0;
208
209 ntfy->p = kmalloc(sizeof(*ntfy->p) + ntfy->reply, GFP_KERNEL);
210 if (ret = -ENOMEM, !ntfy->p)
211 goto done;
212 ntfy->p->base.event = &ntfy->p->e.base;
213 ntfy->p->base.file_priv = f;
214 ntfy->p->base.pid = current->pid;
215 ntfy->p->base.destroy =(void(*)(struct drm_pending_event *))kfree;
216 ntfy->p->e.base.type = DRM_NOUVEAU_EVENT_NVIF;
217 ntfy->p->e.base.length = sizeof(ntfy->p->e.base) + ntfy->reply;
218
219 ret = nvif_client_ioctl(client, argv, argc);
220done:
221 if (ret) {
222 atomic_set(&ntfy->enabled, 0);
223 kfree(ntfy->p);
224 }
225 return ret;
226}
227
228static int
229usif_notify_put(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
230{
231 struct nouveau_cli *cli = nouveau_cli(f);
232 struct nvif_client *client = &cli->base;
233 union {
234 struct nvif_ioctl_ntfy_put_v0 v0;
235 } *args = data;
236 struct usif_notify *ntfy;
237 int ret = -ENOSYS;
238
239 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
240 if (!(ntfy = usif_notify_find(f, args->v0.index)))
241 return -ENOENT;
242 } else
243 return ret;
244
245 ret = nvif_client_ioctl(client, argv, argc);
246 if (ret == 0 && atomic_xchg(&ntfy->enabled, 0))
247 kfree(ntfy->p);
248 return ret;
249}
250
251struct usif_object {
252 struct list_head head;
253 struct list_head ntfy;
254 u8 route;
255 u64 token;
256};
257
258static void
259usif_object_dtor(struct usif_object *object)
260{
261 list_del(&object->head);
262 kfree(object);
263}
264
265static int
266usif_object_new(struct drm_file *f, void *data, u32 size, void *argv, u32 argc)
267{
268 struct nouveau_cli *cli = nouveau_cli(f);
269 struct nvif_client *client = &cli->base;
270 union {
271 struct nvif_ioctl_new_v0 v0;
272 } *args = data;
273 struct usif_object *object;
274 int ret = -ENOSYS;
275
276 if (!(object = kmalloc(sizeof(*object), GFP_KERNEL)))
277 return -ENOMEM;
278 list_add(&object->head, &cli->objects);
279
280 if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, true))) {
281 object->route = args->v0.route;
282 object->token = args->v0.token;
283 args->v0.route = NVDRM_OBJECT_USIF;
284 args->v0.token = (unsigned long)(void *)object;
285 ret = nvif_client_ioctl(client, argv, argc);
286 args->v0.token = object->token;
287 args->v0.route = object->route;
288 }
289
290 if (ret)
291 usif_object_dtor(object);
292 return ret;
293}
294
295int
296usif_ioctl(struct drm_file *filp, void __user *user, u32 argc)
297{
298 struct nouveau_cli *cli = nouveau_cli(filp);
299 struct nvif_client *client = &cli->base;
300 void *data = kmalloc(argc, GFP_KERNEL);
301 u32 size = argc;
302 union {
303 struct nvif_ioctl_v0 v0;
304 } *argv = data;
305 struct usif_object *object;
306 u8 owner;
307 int ret;
308
309 if (ret = -ENOMEM, !argv)
310 goto done;
311 if (ret = -EFAULT, copy_from_user(argv, user, size))
312 goto done;
313
314 if (!(ret = nvif_unpack(-ENOSYS, &data, &size, argv->v0, 0, 0, true))) {
315 /* block access to objects not created via this interface */
316 owner = argv->v0.owner;
317 if (argv->v0.object == 0ULL)
318 argv->v0.owner = NVDRM_OBJECT_ANY; /* except client */
319 else
320 argv->v0.owner = NVDRM_OBJECT_USIF;
321 } else
322 goto done;
323
324 /* USIF slightly abuses some return-only ioctl members in order
325 * to provide interoperability with the older ABI16 objects
326 */
327 mutex_lock(&cli->mutex);
328 if (argv->v0.route) {
329 if (ret = -EINVAL, argv->v0.route == 0xff)
330 ret = nouveau_abi16_usif(filp, argv, argc);
331 if (ret) {
332 mutex_unlock(&cli->mutex);
333 goto done;
334 }
335 }
336
337 switch (argv->v0.type) {
338 case NVIF_IOCTL_V0_NEW:
339 ret = usif_object_new(filp, data, size, argv, argc);
340 break;
341 case NVIF_IOCTL_V0_NTFY_NEW:
342 ret = usif_notify_new(filp, data, size, argv, argc);
343 break;
344 case NVIF_IOCTL_V0_NTFY_DEL:
345 ret = usif_notify_del(filp, data, size, argv, argc);
346 break;
347 case NVIF_IOCTL_V0_NTFY_GET:
348 ret = usif_notify_get(filp, data, size, argv, argc);
349 break;
350 case NVIF_IOCTL_V0_NTFY_PUT:
351 ret = usif_notify_put(filp, data, size, argv, argc);
352 break;
353 default:
354 ret = nvif_client_ioctl(client, argv, argc);
355 break;
356 }
357 if (argv->v0.route == NVDRM_OBJECT_USIF) {
358 object = (void *)(unsigned long)argv->v0.token;
359 argv->v0.route = object->route;
360 argv->v0.token = object->token;
361 if (ret == 0 && argv->v0.type == NVIF_IOCTL_V0_DEL) {
362 list_del(&object->head);
363 kfree(object);
364 }
365 } else {
366 argv->v0.route = NVIF_IOCTL_V0_ROUTE_HIDDEN;
367 argv->v0.token = 0;
368 }
369 argv->v0.owner = owner;
370 mutex_unlock(&cli->mutex);
371
372 if (copy_to_user(user, argv, argc))
373 ret = -EFAULT;
374done:
375 kfree(argv);
376 return ret;
377}
378
379void
380usif_client_fini(struct nouveau_cli *cli)
381{
382 struct usif_object *object, *otemp;
383 struct usif_notify *notify, *ntemp;
384
385 list_for_each_entry_safe(notify, ntemp, &cli->notifys, head) {
386 usif_notify_dtor(notify);
387 }
388
389 list_for_each_entry_safe(object, otemp, &cli->objects, head) {
390 usif_object_dtor(object);
391 }
392}
393
394void
395usif_client_init(struct nouveau_cli *cli)
396{
397 INIT_LIST_HEAD(&cli->objects);
398 INIT_LIST_HEAD(&cli->notifys);
399}