1 /**
2 * \file drm_ioctl.c
3 * IOCTL processing for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9 /*
10 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36 #include "drmP.h"
37 #include "drm_core.h"
38
39 #include "linux/pci.h"
40 #include "linux/export.h"
41
42 /**
43 * Get the bus id.
44 *
45 * \param inode device inode.
46 * \param file_priv DRM file private.
47 * \param cmd command.
48 * \param arg user argument, pointing to a drm_unique structure.
49 * \return zero on success or a negative number on failure.
50 *
51 * Copies the bus id from drm_device::unique into user space.
52 */
drm_getunique(struct drm_device * dev,void * data,struct drm_file * file_priv)53 int drm_getunique(struct drm_device *dev, void *data,
54 struct drm_file *file_priv)
55 {
56 struct drm_unique *u = data;
57 struct drm_master *master = file_priv->master;
58
59 if (u->unique_len >= master->unique_len) {
60 if (copy_to_user(u->unique, master->unique, master->unique_len))
61 return -EFAULT;
62 }
63 u->unique_len = master->unique_len;
64
65 return 0;
66 }
67
68 static void
drm_unset_busid(struct drm_device * dev,struct drm_master * master)69 drm_unset_busid(struct drm_device *dev,
70 struct drm_master *master)
71 {
72 kfree(dev->devname);
73 dev->devname = NULL;
74
75 kfree(master->unique);
76 master->unique = NULL;
77 master->unique_len = 0;
78 master->unique_size = 0;
79 }
80
81 /**
82 * Set the bus id.
83 *
84 * \param inode device inode.
85 * \param file_priv DRM file private.
86 * \param cmd command.
87 * \param arg user argument, pointing to a drm_unique structure.
88 * \return zero on success or a negative number on failure.
89 *
90 * Copies the bus id from userspace into drm_device::unique, and verifies that
91 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
92 * in interface version 1.1 and will return EBUSY when setversion has requested
93 * version 1.1 or greater.
94 */
drm_setunique(struct drm_device * dev,void * data,struct drm_file * file_priv)95 int drm_setunique(struct drm_device *dev, void *data,
96 struct drm_file *file_priv)
97 {
98 struct drm_unique *u = data;
99 struct drm_master *master = file_priv->master;
100 int ret;
101
102 if (master->unique_len || master->unique)
103 return -EBUSY;
104
105 if (!u->unique_len || u->unique_len > 1024)
106 return -EINVAL;
107
108 if (!dev->driver->bus->set_unique)
109 return -EINVAL;
110
111 ret = dev->driver->bus->set_unique(dev, master, u);
112 if (ret)
113 goto err;
114
115 return 0;
116
117 err:
118 drm_unset_busid(dev, master);
119 return ret;
120 }
121
drm_set_busid(struct drm_device * dev,struct drm_file * file_priv)122 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
123 {
124 struct drm_master *master = file_priv->master;
125 int ret;
126
127 if (master->unique != NULL)
128 drm_unset_busid(dev, master);
129
130 ret = dev->driver->bus->set_busid(dev, master);
131 if (ret)
132 goto err;
133 return 0;
134 err:
135 drm_unset_busid(dev, master);
136 return ret;
137 }
138
139 /**
140 * Get a mapping information.
141 *
142 * \param inode device inode.
143 * \param file_priv DRM file private.
144 * \param cmd command.
145 * \param arg user argument, pointing to a drm_map structure.
146 *
147 * \return zero on success or a negative number on failure.
148 *
149 * Searches for the mapping with the specified offset and copies its information
150 * into userspace
151 */
drm_getmap(struct drm_device * dev,void * data,struct drm_file * file_priv)152 int drm_getmap(struct drm_device *dev, void *data,
153 struct drm_file *file_priv)
154 {
155 struct drm_map *map = data;
156 struct drm_map_list *r_list = NULL;
157 struct list_head *list;
158 int idx;
159 int i;
160
161 idx = map->offset;
162 if (idx < 0)
163 return -EINVAL;
164
165 i = 0;
166 mutex_lock(&dev->struct_mutex);
167 list_for_each(list, &dev->maplist) {
168 if (i == idx) {
169 r_list = list_entry(list, struct drm_map_list, head);
170 break;
171 }
172 i++;
173 }
174 if (!r_list || !r_list->map) {
175 mutex_unlock(&dev->struct_mutex);
176 return -EINVAL;
177 }
178
179 map->offset = r_list->map->offset;
180 map->size = r_list->map->size;
181 map->type = r_list->map->type;
182 map->flags = r_list->map->flags;
183 map->handle = (void *)(unsigned long) r_list->user_token;
184 map->mtrr = r_list->map->mtrr;
185 mutex_unlock(&dev->struct_mutex);
186
187 return 0;
188 }
189
190 /**
191 * Get client information.
192 *
193 * \param inode device inode.
194 * \param file_priv DRM file private.
195 * \param cmd command.
196 * \param arg user argument, pointing to a drm_client structure.
197 *
198 * \return zero on success or a negative number on failure.
199 *
200 * Searches for the client with the specified index and copies its information
201 * into userspace
202 */
drm_getclient(struct drm_device * dev,void * data,struct drm_file * file_priv)203 int drm_getclient(struct drm_device *dev, void *data,
204 struct drm_file *file_priv)
205 {
206 struct drm_client *client = data;
207 struct drm_file *pt;
208 int idx;
209 int i;
210
211 idx = client->idx;
212 i = 0;
213
214 mutex_lock(&dev->struct_mutex);
215 list_for_each_entry(pt, &dev->filelist, lhead) {
216 if (i++ >= idx) {
217 client->auth = pt->authenticated;
218 client->pid = pt->pid;
219 client->uid = pt->uid;
220 client->magic = pt->magic;
221 client->iocs = pt->ioctl_count;
222 mutex_unlock(&dev->struct_mutex);
223
224 return 0;
225 }
226 }
227 mutex_unlock(&dev->struct_mutex);
228
229 return -EINVAL;
230 }
231
232 /**
233 * Get statistics information.
234 *
235 * \param inode device inode.
236 * \param file_priv DRM file private.
237 * \param cmd command.
238 * \param arg user argument, pointing to a drm_stats structure.
239 *
240 * \return zero on success or a negative number on failure.
241 */
drm_getstats(struct drm_device * dev,void * data,struct drm_file * file_priv)242 int drm_getstats(struct drm_device *dev, void *data,
243 struct drm_file *file_priv)
244 {
245 struct drm_stats *stats = data;
246 int i;
247
248 memset(stats, 0, sizeof(*stats));
249
250 for (i = 0; i < dev->counters; i++) {
251 if (dev->types[i] == _DRM_STAT_LOCK)
252 stats->data[i].value =
253 (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
254 else
255 stats->data[i].value = atomic_read(&dev->counts[i]);
256 stats->data[i].type = dev->types[i];
257 }
258
259 stats->count = dev->counters;
260
261 return 0;
262 }
263
264 /**
265 * Get device/driver capabilities
266 */
drm_getcap(struct drm_device * dev,void * data,struct drm_file * file_priv)267 int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
268 {
269 struct drm_get_cap *req = data;
270
271 req->value = 0;
272 switch (req->capability) {
273 case DRM_CAP_DUMB_BUFFER:
274 if (dev->driver->dumb_create)
275 req->value = 1;
276 break;
277 case DRM_CAP_VBLANK_HIGH_CRTC:
278 req->value = 1;
279 break;
280 case DRM_CAP_DUMB_PREFERRED_DEPTH:
281 req->value = dev->mode_config.preferred_depth;
282 break;
283 case DRM_CAP_DUMB_PREFER_SHADOW:
284 req->value = dev->mode_config.prefer_shadow;
285 break;
286 default:
287 return -EINVAL;
288 }
289 return 0;
290 }
291
292 /**
293 * Setversion ioctl.
294 *
295 * \param inode device inode.
296 * \param file_priv DRM file private.
297 * \param cmd command.
298 * \param arg user argument, pointing to a drm_lock structure.
299 * \return zero on success or negative number on failure.
300 *
301 * Sets the requested interface version
302 */
drm_setversion(struct drm_device * dev,void * data,struct drm_file * file_priv)303 int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
304 {
305 struct drm_set_version *sv = data;
306 int if_version, retcode = 0;
307
308 if (sv->drm_di_major != -1) {
309 if (sv->drm_di_major != DRM_IF_MAJOR ||
310 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
311 retcode = -EINVAL;
312 goto done;
313 }
314 if_version = DRM_IF_VERSION(sv->drm_di_major,
315 sv->drm_di_minor);
316 dev->if_version = max(if_version, dev->if_version);
317 if (sv->drm_di_minor >= 1) {
318 /*
319 * Version 1.1 includes tying of DRM to specific device
320 * Version 1.4 has proper PCI domain support
321 */
322 retcode = drm_set_busid(dev, file_priv);
323 if (retcode)
324 goto done;
325 }
326 }
327
328 if (sv->drm_dd_major != -1) {
329 if (sv->drm_dd_major != dev->driver->major ||
330 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
331 dev->driver->minor) {
332 retcode = -EINVAL;
333 goto done;
334 }
335
336 if (dev->driver->set_version)
337 dev->driver->set_version(dev, sv);
338 }
339
340 done:
341 sv->drm_di_major = DRM_IF_MAJOR;
342 sv->drm_di_minor = DRM_IF_MINOR;
343 sv->drm_dd_major = dev->driver->major;
344 sv->drm_dd_minor = dev->driver->minor;
345
346 return retcode;
347 }
348
349 /** No-op ioctl. */
drm_noop(struct drm_device * dev,void * data,struct drm_file * file_priv)350 int drm_noop(struct drm_device *dev, void *data,
351 struct drm_file *file_priv)
352 {
353 DRM_DEBUG("\n");
354 return 0;
355 }
356 EXPORT_SYMBOL(drm_noop);
357