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 <drm/drmP.h> |
37 | #include <drm/drm_core.h> |
38 | |
39 | #include <linux/pci.h> |
40 | #include <linux/export.h> |
41 | #ifdef CONFIG_X86 |
42 | #include <asm/mtrr.h> |
43 | #endif |
44 | |
45 | /** |
46 | * Get the bus id. |
47 | * |
48 | * \param inode device inode. |
49 | * \param file_priv DRM file private. |
50 | * \param cmd command. |
51 | * \param arg user argument, pointing to a drm_unique structure. |
52 | * \return zero on success or a negative number on failure. |
53 | * |
54 | * Copies the bus id from drm_device::unique into user space. |
55 | */ |
56 | int drm_getunique(struct drm_device *dev, void *data, |
57 | struct drm_file *file_priv) |
58 | { |
59 | struct drm_unique *u = data; |
60 | struct drm_master *master = file_priv->master; |
61 | |
62 | if (u->unique_len >= master->unique_len) { |
63 | if (copy_to_user(u->unique, master->unique, master->unique_len)) |
64 | return -EFAULT; |
65 | } |
66 | u->unique_len = master->unique_len; |
67 | |
68 | return 0; |
69 | } |
70 | |
71 | static void |
72 | drm_unset_busid(struct drm_device *dev, |
73 | struct drm_master *master) |
74 | { |
75 | kfree(dev->devname); |
76 | dev->devname = NULL; |
77 | |
78 | kfree(master->unique); |
79 | master->unique = NULL; |
80 | master->unique_len = 0; |
81 | master->unique_size = 0; |
82 | } |
83 | |
84 | /** |
85 | * Set the bus id. |
86 | * |
87 | * \param inode device inode. |
88 | * \param file_priv DRM file private. |
89 | * \param cmd command. |
90 | * \param arg user argument, pointing to a drm_unique structure. |
91 | * \return zero on success or a negative number on failure. |
92 | * |
93 | * Copies the bus id from userspace into drm_device::unique, and verifies that |
94 | * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated |
95 | * in interface version 1.1 and will return EBUSY when setversion has requested |
96 | * version 1.1 or greater. |
97 | */ |
98 | int drm_setunique(struct drm_device *dev, void *data, |
99 | struct drm_file *file_priv) |
100 | { |
101 | struct drm_unique *u = data; |
102 | struct drm_master *master = file_priv->master; |
103 | int ret; |
104 | |
105 | if (master->unique_len || master->unique) |
106 | return -EBUSY; |
107 | |
108 | if (!u->unique_len || u->unique_len > 1024) |
109 | return -EINVAL; |
110 | |
111 | if (!dev->driver->bus->set_unique) |
112 | return -EINVAL; |
113 | |
114 | ret = dev->driver->bus->set_unique(dev, master, u); |
115 | if (ret) |
116 | goto err; |
117 | |
118 | return 0; |
119 | |
120 | err: |
121 | drm_unset_busid(dev, master); |
122 | return ret; |
123 | } |
124 | |
125 | static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) |
126 | { |
127 | struct drm_master *master = file_priv->master; |
128 | int ret; |
129 | |
130 | if (master->unique != NULL) |
131 | drm_unset_busid(dev, master); |
132 | |
133 | ret = dev->driver->bus->set_busid(dev, master); |
134 | if (ret) |
135 | goto err; |
136 | return 0; |
137 | err: |
138 | drm_unset_busid(dev, master); |
139 | return ret; |
140 | } |
141 | |
142 | /** |
143 | * Get a mapping information. |
144 | * |
145 | * \param inode device inode. |
146 | * \param file_priv DRM file private. |
147 | * \param cmd command. |
148 | * \param arg user argument, pointing to a drm_map structure. |
149 | * |
150 | * \return zero on success or a negative number on failure. |
151 | * |
152 | * Searches for the mapping with the specified offset and copies its information |
153 | * into userspace |
154 | */ |
155 | int drm_getmap(struct drm_device *dev, void *data, |
156 | struct drm_file *file_priv) |
157 | { |
158 | struct drm_map *map = data; |
159 | struct drm_map_list *r_list = NULL; |
160 | struct list_head *list; |
161 | int idx; |
162 | int i; |
163 | |
164 | idx = map->offset; |
165 | if (idx < 0) |
166 | return -EINVAL; |
167 | |
168 | i = 0; |
169 | mutex_lock(&dev->struct_mutex); |
170 | list_for_each(list, &dev->maplist) { |
171 | if (i == idx) { |
172 | r_list = list_entry(list, struct drm_map_list, head); |
173 | break; |
174 | } |
175 | i++; |
176 | } |
177 | if (!r_list || !r_list->map) { |
178 | mutex_unlock(&dev->struct_mutex); |
179 | return -EINVAL; |
180 | } |
181 | |
182 | map->offset = r_list->map->offset; |
183 | map->size = r_list->map->size; |
184 | map->type = r_list->map->type; |
185 | map->flags = r_list->map->flags; |
186 | map->handle = (void *)(unsigned long) r_list->user_token; |
187 | |
188 | #ifdef CONFIG_X86 |
189 | /* |
190 | * There appears to be exactly one user of the mtrr index: dritest. |
191 | * It's easy enough to keep it working on non-PAT systems. |
192 | */ |
193 | map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr); |
194 | #else |
195 | map->mtrr = -1; |
196 | #endif |
197 | |
198 | mutex_unlock(&dev->struct_mutex); |
199 | |
200 | return 0; |
201 | } |
202 | |
203 | /** |
204 | * Get client information. |
205 | * |
206 | * \param inode device inode. |
207 | * \param file_priv DRM file private. |
208 | * \param cmd command. |
209 | * \param arg user argument, pointing to a drm_client structure. |
210 | * |
211 | * \return zero on success or a negative number on failure. |
212 | * |
213 | * Searches for the client with the specified index and copies its information |
214 | * into userspace |
215 | */ |
216 | int drm_getclient(struct drm_device *dev, void *data, |
217 | struct drm_file *file_priv) |
218 | { |
219 | struct drm_client *client = data; |
220 | |
221 | /* |
222 | * Hollowed-out getclient ioctl to keep some dead old drm tests/tools |
223 | * not breaking completely. Userspace tools stop enumerating one they |
224 | * get -EINVAL, hence this is the return value we need to hand back for |
225 | * no clients tracked. |
226 | * |
227 | * Unfortunately some clients (*cough* libva *cough*) use this in a fun |
228 | * attempt to figure out whether they're authenticated or not. Since |
229 | * that's the only thing they care about, give it to the directly |
230 | * instead of walking one giant list. |
231 | */ |
232 | if (client->idx == 0) { |
233 | client->auth = file_priv->authenticated; |
234 | #ifdef __NetBSD__ /* XXX Too scary to contemplate. */ |
235 | client->pid = curproc->p_pid; |
236 | client->uid = kauth_cred_geteuid(curproc->p_cred); |
237 | #else |
238 | client->pid = pid_vnr(file_priv->pid); |
239 | client->uid = from_kuid_munged(current_user_ns(), |
240 | file_priv->uid); |
241 | #endif |
242 | client->magic = 0; |
243 | client->iocs = 0; |
244 | |
245 | return 0; |
246 | } else { |
247 | return -EINVAL; |
248 | } |
249 | } |
250 | |
251 | /** |
252 | * Get statistics information. |
253 | * |
254 | * \param inode device inode. |
255 | * \param file_priv DRM file private. |
256 | * \param cmd command. |
257 | * \param arg user argument, pointing to a drm_stats structure. |
258 | * |
259 | * \return zero on success or a negative number on failure. |
260 | */ |
261 | int drm_getstats(struct drm_device *dev, void *data, |
262 | struct drm_file *file_priv) |
263 | { |
264 | struct drm_stats *stats = data; |
265 | |
266 | /* Clear stats to prevent userspace from eating its stack garbage. */ |
267 | memset(stats, 0, sizeof(*stats)); |
268 | |
269 | return 0; |
270 | } |
271 | |
272 | /** |
273 | * Get device/driver capabilities |
274 | */ |
275 | int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
276 | { |
277 | struct drm_get_cap *req = data; |
278 | |
279 | req->value = 0; |
280 | switch (req->capability) { |
281 | case DRM_CAP_DUMB_BUFFER: |
282 | if (dev->driver->dumb_create) |
283 | req->value = 1; |
284 | break; |
285 | case DRM_CAP_VBLANK_HIGH_CRTC: |
286 | req->value = 1; |
287 | break; |
288 | case DRM_CAP_DUMB_PREFERRED_DEPTH: |
289 | req->value = dev->mode_config.preferred_depth; |
290 | break; |
291 | case DRM_CAP_DUMB_PREFER_SHADOW: |
292 | req->value = dev->mode_config.prefer_shadow; |
293 | break; |
294 | case DRM_CAP_PRIME: |
295 | req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; |
296 | req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; |
297 | break; |
298 | case DRM_CAP_TIMESTAMP_MONOTONIC: |
299 | req->value = drm_timestamp_monotonic; |
300 | break; |
301 | case DRM_CAP_ASYNC_PAGE_FLIP: |
302 | req->value = dev->mode_config.async_page_flip; |
303 | break; |
304 | case DRM_CAP_CURSOR_WIDTH: |
305 | if (dev->mode_config.cursor_width) |
306 | req->value = dev->mode_config.cursor_width; |
307 | else |
308 | req->value = 64; |
309 | break; |
310 | case DRM_CAP_CURSOR_HEIGHT: |
311 | if (dev->mode_config.cursor_height) |
312 | req->value = dev->mode_config.cursor_height; |
313 | else |
314 | req->value = 64; |
315 | break; |
316 | default: |
317 | return -EINVAL; |
318 | } |
319 | return 0; |
320 | } |
321 | |
322 | /** |
323 | * Set device/driver capabilities |
324 | */ |
325 | int |
326 | drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
327 | { |
328 | struct drm_set_client_cap *req = data; |
329 | |
330 | switch (req->capability) { |
331 | case DRM_CLIENT_CAP_STEREO_3D: |
332 | if (req->value > 1) |
333 | return -EINVAL; |
334 | file_priv->stereo_allowed = req->value; |
335 | break; |
336 | case DRM_CLIENT_CAP_UNIVERSAL_PLANES: |
337 | if (!drm_universal_planes) |
338 | return -EINVAL; |
339 | if (req->value > 1) |
340 | return -EINVAL; |
341 | file_priv->universal_planes = req->value; |
342 | break; |
343 | default: |
344 | return -EINVAL; |
345 | } |
346 | |
347 | return 0; |
348 | } |
349 | |
350 | /** |
351 | * Setversion ioctl. |
352 | * |
353 | * \param inode device inode. |
354 | * \param file_priv DRM file private. |
355 | * \param cmd command. |
356 | * \param arg user argument, pointing to a drm_lock structure. |
357 | * \return zero on success or negative number on failure. |
358 | * |
359 | * Sets the requested interface version |
360 | */ |
361 | int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) |
362 | { |
363 | struct drm_set_version *sv = data; |
364 | int if_version, retcode = 0; |
365 | |
366 | if (sv->drm_di_major != -1) { |
367 | if (sv->drm_di_major != DRM_IF_MAJOR || |
368 | sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { |
369 | retcode = -EINVAL; |
370 | goto done; |
371 | } |
372 | if_version = DRM_IF_VERSION(sv->drm_di_major, |
373 | sv->drm_di_minor); |
374 | dev->if_version = max(if_version, dev->if_version); |
375 | if (sv->drm_di_minor >= 1) { |
376 | /* |
377 | * Version 1.1 includes tying of DRM to specific device |
378 | * Version 1.4 has proper PCI domain support |
379 | */ |
380 | retcode = drm_set_busid(dev, file_priv); |
381 | if (retcode) |
382 | goto done; |
383 | } |
384 | } |
385 | |
386 | if (sv->drm_dd_major != -1) { |
387 | if (sv->drm_dd_major != dev->driver->major || |
388 | sv->drm_dd_minor < 0 || sv->drm_dd_minor > |
389 | dev->driver->minor) { |
390 | retcode = -EINVAL; |
391 | goto done; |
392 | } |
393 | } |
394 | |
395 | done: |
396 | sv->drm_di_major = DRM_IF_MAJOR; |
397 | sv->drm_di_minor = DRM_IF_MINOR; |
398 | sv->drm_dd_major = dev->driver->major; |
399 | sv->drm_dd_minor = dev->driver->minor; |
400 | |
401 | return retcode; |
402 | } |
403 | |
404 | /** No-op ioctl. */ |
405 | int drm_noop(struct drm_device *dev, void *data, |
406 | struct drm_file *file_priv) |
407 | { |
408 | DRM_DEBUG("\n" ); |
409 | return 0; |
410 | } |
411 | EXPORT_SYMBOL(drm_noop); |
412 | |