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1da177e4 LT |
1 | /* |
2 | * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com | |
3 | * | |
4 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
5 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
6 | * All Rights Reserved. | |
7 | * | |
ec8f112d DH |
8 | * Author Rickard E. (Rik) Faith <faith@valinux.com> |
9 | * Author Gareth Hughes <gareth@valinux.com> | |
10 | * | |
1da177e4 LT |
11 | * Permission is hereby granted, free of charge, to any person obtaining a |
12 | * copy of this software and associated documentation files (the "Software"), | |
13 | * to deal in the Software without restriction, including without limitation | |
14 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
15 | * and/or sell copies of the Software, and to permit persons to whom the | |
16 | * Software is furnished to do so, subject to the following conditions: | |
17 | * | |
18 | * The above copyright notice and this permission notice (including the next | |
19 | * paragraph) shall be included in all copies or substantial portions of the | |
20 | * Software. | |
21 | * | |
22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
23 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
24 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
25 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
26 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
27 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
28 | * OTHER DEALINGS IN THE SOFTWARE. | |
29 | */ | |
30 | ||
760285e7 DH |
31 | #include <drm/drmP.h> |
32 | #include <drm/drm_core.h> | |
e7b96070 | 33 | #include "drm_legacy.h" |
18882995 | 34 | #include "drm_internal.h" |
a97df1cc | 35 | #include "drm_crtc_internal.h" |
1da177e4 | 36 | |
760285e7 DH |
37 | #include <linux/pci.h> |
38 | #include <linux/export.h> | |
1da177e4 | 39 | |
ec8f112d DH |
40 | static int drm_version(struct drm_device *dev, void *data, |
41 | struct drm_file *file_priv); | |
42 | ||
0aaf20cf | 43 | /* |
1da177e4 | 44 | * Get the bus id. |
b5e89ed5 | 45 | * |
1da177e4 | 46 | * \param inode device inode. |
6c340eac | 47 | * \param file_priv DRM file private. |
1da177e4 LT |
48 | * \param cmd command. |
49 | * \param arg user argument, pointing to a drm_unique structure. | |
50 | * \return zero on success or a negative number on failure. | |
51 | * | |
52 | * Copies the bus id from drm_device::unique into user space. | |
53 | */ | |
78238757 | 54 | static int drm_getunique(struct drm_device *dev, void *data, |
c153f45f | 55 | struct drm_file *file_priv) |
1da177e4 | 56 | { |
c153f45f | 57 | struct drm_unique *u = data; |
7c1c2871 | 58 | struct drm_master *master = file_priv->master; |
1da177e4 | 59 | |
7c1c2871 DA |
60 | if (u->unique_len >= master->unique_len) { |
61 | if (copy_to_user(u->unique, master->unique, master->unique_len)) | |
1da177e4 LT |
62 | return -EFAULT; |
63 | } | |
7c1c2871 | 64 | u->unique_len = master->unique_len; |
c153f45f | 65 | |
1da177e4 LT |
66 | return 0; |
67 | } | |
68 | ||
3fb688fd CW |
69 | static void |
70 | drm_unset_busid(struct drm_device *dev, | |
71 | struct drm_master *master) | |
72 | { | |
3fb688fd CW |
73 | kfree(master->unique); |
74 | master->unique = NULL; | |
75 | master->unique_len = 0; | |
3fb688fd CW |
76 | } |
77 | ||
0aaf20cf | 78 | /* |
1da177e4 | 79 | * Set the bus id. |
b5e89ed5 | 80 | * |
1da177e4 | 81 | * \param inode device inode. |
6c340eac | 82 | * \param file_priv DRM file private. |
1da177e4 LT |
83 | * \param cmd command. |
84 | * \param arg user argument, pointing to a drm_unique structure. | |
85 | * \return zero on success or a negative number on failure. | |
86 | * | |
87 | * Copies the bus id from userspace into drm_device::unique, and verifies that | |
88 | * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated | |
89 | * in interface version 1.1 and will return EBUSY when setversion has requested | |
53bf2a2b DV |
90 | * version 1.1 or greater. Also note that KMS is all version 1.1 and later and |
91 | * UMS was only ever supported on pci devices. | |
1da177e4 | 92 | */ |
78238757 | 93 | static int drm_setunique(struct drm_device *dev, void *data, |
c153f45f | 94 | struct drm_file *file_priv) |
1da177e4 | 95 | { |
c153f45f | 96 | struct drm_unique *u = data; |
7c1c2871 | 97 | struct drm_master *master = file_priv->master; |
8410ea3b | 98 | int ret; |
1da177e4 | 99 | |
7c1c2871 | 100 | if (master->unique_len || master->unique) |
b5e89ed5 | 101 | return -EBUSY; |
1da177e4 | 102 | |
c153f45f | 103 | if (!u->unique_len || u->unique_len > 1024) |
b5e89ed5 | 104 | return -EINVAL; |
1da177e4 | 105 | |
53bf2a2b DV |
106 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
107 | return 0; | |
108 | ||
109 | if (WARN_ON(!dev->pdev)) | |
8410ea3b | 110 | return -EINVAL; |
b5e89ed5 | 111 | |
53bf2a2b | 112 | ret = drm_pci_set_unique(dev, master, u); |
8410ea3b | 113 | if (ret) |
3fb688fd | 114 | goto err; |
1da177e4 LT |
115 | |
116 | return 0; | |
3fb688fd CW |
117 | |
118 | err: | |
119 | drm_unset_busid(dev, master); | |
120 | return ret; | |
1da177e4 LT |
121 | } |
122 | ||
7c1c2871 | 123 | static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) |
1da177e4 | 124 | { |
7c1c2871 | 125 | struct drm_master *master = file_priv->master; |
8410ea3b | 126 | int ret; |
3fb688fd CW |
127 | |
128 | if (master->unique != NULL) | |
129 | drm_unset_busid(dev, master); | |
fe34765b | 130 | |
915b4d11 DH |
131 | if (dev->driver->set_busid) { |
132 | ret = dev->driver->set_busid(dev, master); | |
133 | if (ret) { | |
134 | drm_unset_busid(dev, master); | |
135 | return ret; | |
136 | } | |
ca8e2ad7 TR |
137 | } else { |
138 | if (WARN(dev->unique == NULL, | |
c5786fe5 | 139 | "No drm_driver.set_busid() implementation provided by " |
ca8e2ad7 TR |
140 | "%ps. Use drm_dev_set_unique() to set the unique " |
141 | "name explicitly.", dev->driver)) | |
142 | return -EINVAL; | |
143 | ||
144 | master->unique = kstrdup(dev->unique, GFP_KERNEL); | |
145 | if (master->unique) | |
146 | master->unique_len = strlen(dev->unique); | |
147 | } | |
148 | ||
1da177e4 LT |
149 | return 0; |
150 | } | |
151 | ||
0aaf20cf | 152 | /* |
1da177e4 LT |
153 | * Get a mapping information. |
154 | * | |
155 | * \param inode device inode. | |
6c340eac | 156 | * \param file_priv DRM file private. |
1da177e4 LT |
157 | * \param cmd command. |
158 | * \param arg user argument, pointing to a drm_map structure. | |
b5e89ed5 | 159 | * |
1da177e4 LT |
160 | * \return zero on success or a negative number on failure. |
161 | * | |
162 | * Searches for the mapping with the specified offset and copies its information | |
163 | * into userspace | |
164 | */ | |
78238757 | 165 | static int drm_getmap(struct drm_device *dev, void *data, |
c153f45f | 166 | struct drm_file *file_priv) |
1da177e4 | 167 | { |
c153f45f | 168 | struct drm_map *map = data; |
55910517 | 169 | struct drm_map_list *r_list = NULL; |
1da177e4 | 170 | struct list_head *list; |
b5e89ed5 DA |
171 | int idx; |
172 | int i; | |
1da177e4 | 173 | |
c153f45f | 174 | idx = map->offset; |
09b4ea47 | 175 | if (idx < 0) |
1da177e4 | 176 | return -EINVAL; |
1da177e4 LT |
177 | |
178 | i = 0; | |
09b4ea47 | 179 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 180 | list_for_each(list, &dev->maplist) { |
b5e89ed5 | 181 | if (i == idx) { |
55910517 | 182 | r_list = list_entry(list, struct drm_map_list, head); |
1da177e4 LT |
183 | break; |
184 | } | |
185 | i++; | |
186 | } | |
b5e89ed5 | 187 | if (!r_list || !r_list->map) { |
30e2fb18 | 188 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
189 | return -EINVAL; |
190 | } | |
191 | ||
c153f45f EA |
192 | map->offset = r_list->map->offset; |
193 | map->size = r_list->map->size; | |
194 | map->type = r_list->map->type; | |
195 | map->flags = r_list->map->flags; | |
196 | map->handle = (void *)(unsigned long) r_list->user_token; | |
7d010fdf | 197 | map->mtrr = arch_phys_wc_index(r_list->map->mtrr); |
0dd99f1b | 198 | |
30e2fb18 | 199 | mutex_unlock(&dev->struct_mutex); |
1da177e4 | 200 | |
1da177e4 LT |
201 | return 0; |
202 | } | |
203 | ||
0aaf20cf | 204 | /* |
1da177e4 LT |
205 | * Get client information. |
206 | * | |
207 | * \param inode device inode. | |
6c340eac | 208 | * \param file_priv DRM file private. |
1da177e4 LT |
209 | * \param cmd command. |
210 | * \param arg user argument, pointing to a drm_client structure. | |
b5e89ed5 | 211 | * |
1da177e4 LT |
212 | * \return zero on success or a negative number on failure. |
213 | * | |
214 | * Searches for the client with the specified index and copies its information | |
215 | * into userspace | |
216 | */ | |
78238757 | 217 | static int drm_getclient(struct drm_device *dev, void *data, |
c153f45f | 218 | struct drm_file *file_priv) |
1da177e4 | 219 | { |
c153f45f | 220 | struct drm_client *client = data; |
09b4ea47 | 221 | |
719524df DV |
222 | /* |
223 | * Hollowed-out getclient ioctl to keep some dead old drm tests/tools | |
224 | * not breaking completely. Userspace tools stop enumerating one they | |
225 | * get -EINVAL, hence this is the return value we need to hand back for | |
226 | * no clients tracked. | |
227 | * | |
228 | * Unfortunately some clients (*cough* libva *cough*) use this in a fun | |
229 | * attempt to figure out whether they're authenticated or not. Since | |
230 | * that's the only thing they care about, give it to the directly | |
231 | * instead of walking one giant list. | |
232 | */ | |
233 | if (client->idx == 0) { | |
234 | client->auth = file_priv->authenticated; | |
235 | client->pid = pid_vnr(file_priv->pid); | |
236 | client->uid = from_kuid_munged(current_user_ns(), | |
237 | file_priv->uid); | |
238 | client->magic = 0; | |
239 | client->iocs = 0; | |
240 | ||
241 | return 0; | |
242 | } else { | |
243 | return -EINVAL; | |
bd1b331f | 244 | } |
1da177e4 LT |
245 | } |
246 | ||
0aaf20cf | 247 | /* |
b5e89ed5 DA |
248 | * Get statistics information. |
249 | * | |
1da177e4 | 250 | * \param inode device inode. |
6c340eac | 251 | * \param file_priv DRM file private. |
1da177e4 LT |
252 | * \param cmd command. |
253 | * \param arg user argument, pointing to a drm_stats structure. | |
b5e89ed5 | 254 | * |
1da177e4 LT |
255 | * \return zero on success or a negative number on failure. |
256 | */ | |
78238757 | 257 | static int drm_getstats(struct drm_device *dev, void *data, |
c153f45f | 258 | struct drm_file *file_priv) |
1da177e4 | 259 | { |
c153f45f | 260 | struct drm_stats *stats = data; |
1da177e4 | 261 | |
d79cdc83 | 262 | /* Clear stats to prevent userspace from eating its stack garbage. */ |
246a3d18 | 263 | memset(stats, 0, sizeof(*stats)); |
b5e89ed5 | 264 | |
1da177e4 LT |
265 | return 0; |
266 | } | |
267 | ||
0aaf20cf | 268 | /* |
9f35421e BS |
269 | * Get device/driver capabilities |
270 | */ | |
78238757 | 271 | static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
9f35421e BS |
272 | { |
273 | struct drm_get_cap *req = data; | |
274 | ||
275 | req->value = 0; | |
e73f88af DA |
276 | switch (req->capability) { |
277 | case DRM_CAP_DUMB_BUFFER: | |
278 | if (dev->driver->dumb_create) | |
279 | req->value = 1; | |
280 | break; | |
51eab416 | 281 | case DRM_CAP_VBLANK_HIGH_CRTC: |
19b01b5f IH |
282 | req->value = 1; |
283 | break; | |
019d96cb DA |
284 | case DRM_CAP_DUMB_PREFERRED_DEPTH: |
285 | req->value = dev->mode_config.preferred_depth; | |
286 | break; | |
287 | case DRM_CAP_DUMB_PREFER_SHADOW: | |
288 | req->value = dev->mode_config.prefer_shadow; | |
289 | break; | |
4271a409 DA |
290 | case DRM_CAP_PRIME: |
291 | req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; | |
292 | req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; | |
293 | break; | |
c61eef72 ID |
294 | case DRM_CAP_TIMESTAMP_MONOTONIC: |
295 | req->value = drm_timestamp_monotonic; | |
296 | break; | |
62f2104f KP |
297 | case DRM_CAP_ASYNC_PAGE_FLIP: |
298 | req->value = dev->mode_config.async_page_flip; | |
299 | break; | |
8716ed4e AD |
300 | case DRM_CAP_CURSOR_WIDTH: |
301 | if (dev->mode_config.cursor_width) | |
302 | req->value = dev->mode_config.cursor_width; | |
303 | else | |
304 | req->value = 64; | |
305 | break; | |
306 | case DRM_CAP_CURSOR_HEIGHT: | |
307 | if (dev->mode_config.cursor_height) | |
308 | req->value = dev->mode_config.cursor_height; | |
309 | else | |
310 | req->value = 64; | |
311 | break; | |
e3eb3250 RC |
312 | case DRM_CAP_ADDFB2_MODIFIERS: |
313 | req->value = dev->mode_config.allow_fb_modifiers; | |
314 | break; | |
e73f88af DA |
315 | default: |
316 | return -EINVAL; | |
317 | } | |
9f35421e BS |
318 | return 0; |
319 | } | |
320 | ||
0aaf20cf | 321 | /* |
1c0814fe DL |
322 | * Set device/driver capabilities |
323 | */ | |
78238757 | 324 | static int |
1c0814fe DL |
325 | drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
326 | { | |
61d8e328 DL |
327 | struct drm_set_client_cap *req = data; |
328 | ||
329 | switch (req->capability) { | |
330 | case DRM_CLIENT_CAP_STEREO_3D: | |
331 | if (req->value > 1) | |
332 | return -EINVAL; | |
333 | file_priv->stereo_allowed = req->value; | |
334 | break; | |
681e7ec7 | 335 | case DRM_CLIENT_CAP_UNIVERSAL_PLANES: |
681e7ec7 MR |
336 | if (req->value > 1) |
337 | return -EINVAL; | |
338 | file_priv->universal_planes = req->value; | |
339 | break; | |
88a48e29 | 340 | case DRM_CLIENT_CAP_ATOMIC: |
88a48e29 RC |
341 | if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) |
342 | return -EINVAL; | |
343 | if (req->value > 1) | |
344 | return -EINVAL; | |
345 | file_priv->atomic = req->value; | |
179f158c | 346 | file_priv->universal_planes = req->value; |
88a48e29 | 347 | break; |
61d8e328 DL |
348 | default: |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | return 0; | |
1c0814fe DL |
353 | } |
354 | ||
0aaf20cf | 355 | /* |
1da177e4 LT |
356 | * Setversion ioctl. |
357 | * | |
358 | * \param inode device inode. | |
6c340eac | 359 | * \param file_priv DRM file private. |
1da177e4 LT |
360 | * \param cmd command. |
361 | * \param arg user argument, pointing to a drm_lock structure. | |
362 | * \return zero on success or negative number on failure. | |
363 | * | |
364 | * Sets the requested interface version | |
365 | */ | |
78238757 | 366 | static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 | 367 | { |
c153f45f EA |
368 | struct drm_set_version *sv = data; |
369 | int if_version, retcode = 0; | |
370 | ||
371 | if (sv->drm_di_major != -1) { | |
372 | if (sv->drm_di_major != DRM_IF_MAJOR || | |
373 | sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { | |
374 | retcode = -EINVAL; | |
375 | goto done; | |
376 | } | |
377 | if_version = DRM_IF_VERSION(sv->drm_di_major, | |
378 | sv->drm_di_minor); | |
3d77461e | 379 | dev->if_version = max(if_version, dev->if_version); |
c153f45f | 380 | if (sv->drm_di_minor >= 1) { |
1da177e4 LT |
381 | /* |
382 | * Version 1.1 includes tying of DRM to specific device | |
c17c2f89 | 383 | * Version 1.4 has proper PCI domain support |
1da177e4 | 384 | */ |
3fb688fd CW |
385 | retcode = drm_set_busid(dev, file_priv); |
386 | if (retcode) | |
387 | goto done; | |
1da177e4 LT |
388 | } |
389 | } | |
390 | ||
c153f45f EA |
391 | if (sv->drm_dd_major != -1) { |
392 | if (sv->drm_dd_major != dev->driver->major || | |
393 | sv->drm_dd_minor < 0 || sv->drm_dd_minor > | |
394 | dev->driver->minor) { | |
395 | retcode = -EINVAL; | |
396 | goto done; | |
397 | } | |
1da177e4 | 398 | } |
c153f45f EA |
399 | |
400 | done: | |
401 | sv->drm_di_major = DRM_IF_MAJOR; | |
402 | sv->drm_di_minor = DRM_IF_MINOR; | |
403 | sv->drm_dd_major = dev->driver->major; | |
404 | sv->drm_dd_minor = dev->driver->minor; | |
405 | ||
406 | return retcode; | |
1da177e4 LT |
407 | } |
408 | ||
0aaf20cf DV |
409 | /** |
410 | * drm_noop - DRM no-op ioctl implemntation | |
411 | * @dev: DRM device for the ioctl | |
412 | * @data: data pointer for the ioctl | |
413 | * @file_priv: DRM file for the ioctl call | |
414 | * | |
415 | * This no-op implementation for drm ioctls is useful for deprecated | |
416 | * functionality where we can't return a failure code because existing userspace | |
417 | * checks the result of the ioctl, but doesn't care about the action. | |
418 | * | |
419 | * Always returns successfully with 0. | |
420 | */ | |
c153f45f EA |
421 | int drm_noop(struct drm_device *dev, void *data, |
422 | struct drm_file *file_priv) | |
1da177e4 LT |
423 | { |
424 | DRM_DEBUG("\n"); | |
425 | return 0; | |
426 | } | |
b2c606fe | 427 | EXPORT_SYMBOL(drm_noop); |
ec8f112d | 428 | |
0aaf20cf DV |
429 | /** |
430 | * drm_invalid_op - DRM invalid ioctl implemntation | |
431 | * @dev: DRM device for the ioctl | |
432 | * @data: data pointer for the ioctl | |
433 | * @file_priv: DRM file for the ioctl call | |
434 | * | |
435 | * This no-op implementation for drm ioctls is useful for deprecated | |
436 | * functionality where we really don't want to allow userspace to call the ioctl | |
437 | * any more. This is the case for old ums interfaces for drivers that | |
438 | * transitioned to kms gradually and so kept the old legacy tables around. This | |
439 | * only applies to radeon and i915 kms drivers, other drivers shouldn't need to | |
440 | * use this function. | |
441 | * | |
442 | * Always fails with a return value of -EINVAL. | |
443 | */ | |
4b63539b DV |
444 | int drm_invalid_op(struct drm_device *dev, void *data, |
445 | struct drm_file *file_priv) | |
446 | { | |
447 | return -EINVAL; | |
448 | } | |
449 | EXPORT_SYMBOL(drm_invalid_op); | |
450 | ||
0aaf20cf | 451 | /* |
ec8f112d DH |
452 | * Copy and IOCTL return string to user space |
453 | */ | |
454 | static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) | |
455 | { | |
456 | int len; | |
457 | ||
458 | /* don't overflow userbuf */ | |
459 | len = strlen(value); | |
460 | if (len > *buf_len) | |
461 | len = *buf_len; | |
462 | ||
463 | /* let userspace know exact length of driver value (which could be | |
464 | * larger than the userspace-supplied buffer) */ | |
465 | *buf_len = strlen(value); | |
466 | ||
467 | /* finally, try filling in the userbuf */ | |
468 | if (len && buf) | |
469 | if (copy_to_user(buf, value, len)) | |
470 | return -EFAULT; | |
471 | return 0; | |
472 | } | |
473 | ||
0aaf20cf | 474 | /* |
ec8f112d DH |
475 | * Get version information |
476 | * | |
477 | * \param inode device inode. | |
478 | * \param filp file pointer. | |
479 | * \param cmd command. | |
480 | * \param arg user argument, pointing to a drm_version structure. | |
481 | * \return zero on success or negative number on failure. | |
482 | * | |
483 | * Fills in the version information in \p arg. | |
484 | */ | |
485 | static int drm_version(struct drm_device *dev, void *data, | |
486 | struct drm_file *file_priv) | |
487 | { | |
488 | struct drm_version *version = data; | |
489 | int err; | |
490 | ||
491 | version->version_major = dev->driver->major; | |
492 | version->version_minor = dev->driver->minor; | |
493 | version->version_patchlevel = dev->driver->patchlevel; | |
494 | err = drm_copy_field(version->name, &version->name_len, | |
495 | dev->driver->name); | |
496 | if (!err) | |
497 | err = drm_copy_field(version->date, &version->date_len, | |
498 | dev->driver->date); | |
499 | if (!err) | |
500 | err = drm_copy_field(version->desc, &version->desc_len, | |
501 | dev->driver->desc); | |
502 | ||
503 | return err; | |
504 | } | |
505 | ||
0aaf20cf | 506 | /* |
ec8f112d DH |
507 | * drm_ioctl_permit - Check ioctl permissions against caller |
508 | * | |
509 | * @flags: ioctl permission flags. | |
510 | * @file_priv: Pointer to struct drm_file identifying the caller. | |
511 | * | |
512 | * Checks whether the caller is allowed to run an ioctl with the | |
513 | * indicated permissions. If so, returns zero. Otherwise returns an | |
514 | * error code suitable for ioctl return. | |
515 | */ | |
5101020c | 516 | int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) |
ec8f112d DH |
517 | { |
518 | /* ROOT_ONLY is only for CAP_SYS_ADMIN */ | |
519 | if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) | |
520 | return -EACCES; | |
521 | ||
522 | /* AUTH is only for authenticated or render client */ | |
523 | if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && | |
524 | !file_priv->authenticated)) | |
525 | return -EACCES; | |
526 | ||
527 | /* MASTER is only for master or control clients */ | |
7963e9db | 528 | if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && |
ec8f112d DH |
529 | !drm_is_control_client(file_priv))) |
530 | return -EACCES; | |
531 | ||
532 | /* Control clients must be explicitly allowed */ | |
533 | if (unlikely(!(flags & DRM_CONTROL_ALLOW) && | |
534 | drm_is_control_client(file_priv))) | |
535 | return -EACCES; | |
536 | ||
537 | /* Render clients must be explicitly allowed */ | |
538 | if (unlikely(!(flags & DRM_RENDER_ALLOW) && | |
539 | drm_is_render_client(file_priv))) | |
540 | return -EACCES; | |
541 | ||
542 | return 0; | |
543 | } | |
5101020c | 544 | EXPORT_SYMBOL(drm_ioctl_permit); |
ec8f112d | 545 | |
066626d5 EV |
546 | #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ |
547 | [DRM_IOCTL_NR(ioctl)] = { \ | |
548 | .cmd = ioctl, \ | |
549 | .func = _func, \ | |
550 | .flags = _flags, \ | |
551 | .name = #ioctl \ | |
552 | } | |
78238757 | 553 | |
0aaf20cf | 554 | /* Ioctl table */ |
78238757 | 555 | static const struct drm_ioctl_desc drm_ioctls[] = { |
30c64664 TH |
556 | DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, |
557 | DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), | |
78238757 DV |
558 | DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), |
559 | DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0), | |
560 | DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), | |
561 | DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED), | |
562 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), | |
563 | DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), | |
564 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
565 | DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), | |
566 | DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), | |
567 | ||
568 | DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
569 | DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
570 | DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
571 | DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER), | |
572 | ||
573 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
574 | DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), | |
575 | ||
576 | DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
577 | DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), | |
578 | ||
579 | DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY), | |
580 | DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY), | |
581 | ||
582 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), | |
583 | DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
584 | DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
585 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), | |
586 | DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
587 | DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
588 | DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), | |
589 | ||
590 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
591 | DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
592 | ||
593 | DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), | |
594 | DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), | |
595 | ||
596 | DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), | |
597 | ||
598 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
599 | DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
600 | DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), | |
601 | DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), | |
602 | DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), | |
603 | DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), | |
604 | ||
605 | DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
606 | ||
a7fb8a23 | 607 | #if IS_ENABLED(CONFIG_AGP) |
78238757 DV |
608 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
609 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
610 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
611 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), | |
612 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
613 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
614 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
615 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
616 | #endif | |
617 | ||
618 | DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
619 | DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
620 | ||
621 | DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), | |
622 | ||
623 | DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), | |
624 | ||
625 | DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
626 | ||
627 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
628 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), | |
629 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), | |
630 | ||
631 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
632 | ||
633 | DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
634 | DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
635 | ||
636 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
637 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
638 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
639 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
640 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
641 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
642 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), | |
643 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
644 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
645 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
646 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
647 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
648 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
649 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
650 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
651 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
652 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
653 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
654 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
655 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
656 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
657 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
658 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
659 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
660 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
661 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
662 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
d34f20d6 | 663 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
e2f5d2ea DS |
664 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
665 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
78238757 DV |
666 | }; |
667 | ||
668 | #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) | |
669 | ||
ec8f112d | 670 | /** |
0aaf20cf DV |
671 | * drm_ioctl - ioctl callback implementation for DRM drivers |
672 | * @filp: file this ioctl is called on | |
673 | * @cmd: ioctl cmd number | |
674 | * @arg: user argument | |
ec8f112d DH |
675 | * |
676 | * Looks up the ioctl function in the ::ioctls table, checking for root | |
677 | * previleges if so required, and dispatches to the respective function. | |
0aaf20cf DV |
678 | * |
679 | * Returns: | |
680 | * Zero on success, negative error code on failure. | |
ec8f112d DH |
681 | */ |
682 | long drm_ioctl(struct file *filp, | |
683 | unsigned int cmd, unsigned long arg) | |
684 | { | |
685 | struct drm_file *file_priv = filp->private_data; | |
686 | struct drm_device *dev; | |
687 | const struct drm_ioctl_desc *ioctl = NULL; | |
688 | drm_ioctl_t *func; | |
689 | unsigned int nr = DRM_IOCTL_NR(cmd); | |
690 | int retcode = -EINVAL; | |
691 | char stack_kdata[128]; | |
692 | char *kdata = NULL; | |
83be0038 | 693 | unsigned int usize, asize, drv_size; |
ea487835 | 694 | bool is_driver_ioctl; |
ec8f112d DH |
695 | |
696 | dev = file_priv->minor->dev; | |
697 | ||
698 | if (drm_device_is_unplugged(dev)) | |
699 | return -ENODEV; | |
700 | ||
ea487835 DV |
701 | is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; |
702 | ||
703 | if (is_driver_ioctl) { | |
83be0038 VS |
704 | /* driver ioctl */ |
705 | if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) | |
706 | goto err_i1; | |
ec8f112d | 707 | ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; |
83be0038 VS |
708 | } else { |
709 | /* core ioctl */ | |
710 | if (nr >= DRM_CORE_IOCTL_COUNT) | |
711 | goto err_i1; | |
ec8f112d | 712 | ioctl = &drm_ioctls[nr]; |
83be0038 | 713 | } |
ec8f112d | 714 | |
83be0038 | 715 | drv_size = _IOC_SIZE(ioctl->cmd); |
53615af7 VS |
716 | usize = _IOC_SIZE(cmd); |
717 | asize = max(usize, drv_size); | |
83be0038 | 718 | cmd = ioctl->cmd; |
ec8f112d DH |
719 | |
720 | DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", | |
721 | task_pid_nr(current), | |
722 | (long)old_encode_dev(file_priv->minor->kdev->devt), | |
723 | file_priv->authenticated, ioctl->name); | |
724 | ||
725 | /* Do not trust userspace, use our own definition */ | |
726 | func = ioctl->func; | |
727 | ||
728 | if (unlikely(!func)) { | |
729 | DRM_DEBUG("no function\n"); | |
730 | retcode = -EINVAL; | |
731 | goto err_i1; | |
732 | } | |
733 | ||
734 | retcode = drm_ioctl_permit(ioctl->flags, file_priv); | |
735 | if (unlikely(retcode)) | |
736 | goto err_i1; | |
737 | ||
738 | if (cmd & (IOC_IN | IOC_OUT)) { | |
739 | if (asize <= sizeof(stack_kdata)) { | |
740 | kdata = stack_kdata; | |
741 | } else { | |
742 | kdata = kmalloc(asize, GFP_KERNEL); | |
743 | if (!kdata) { | |
744 | retcode = -ENOMEM; | |
745 | goto err_i1; | |
746 | } | |
747 | } | |
748 | if (asize > usize) | |
749 | memset(kdata + usize, 0, asize - usize); | |
750 | } | |
751 | ||
752 | if (cmd & IOC_IN) { | |
753 | if (copy_from_user(kdata, (void __user *)arg, | |
754 | usize) != 0) { | |
755 | retcode = -EFAULT; | |
756 | goto err_i1; | |
757 | } | |
758 | } else if (cmd & IOC_OUT) { | |
759 | memset(kdata, 0, usize); | |
760 | } | |
761 | ||
ea487835 DV |
762 | /* Enforce sane locking for kms driver ioctls. Core ioctls are |
763 | * too messy still. */ | |
764 | if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || | |
765 | (ioctl->flags & DRM_UNLOCKED)) | |
ec8f112d DH |
766 | retcode = func(dev, kdata, file_priv); |
767 | else { | |
768 | mutex_lock(&drm_global_mutex); | |
769 | retcode = func(dev, kdata, file_priv); | |
770 | mutex_unlock(&drm_global_mutex); | |
771 | } | |
772 | ||
773 | if (cmd & IOC_OUT) { | |
774 | if (copy_to_user((void __user *)arg, kdata, | |
775 | usize) != 0) | |
776 | retcode = -EFAULT; | |
777 | } | |
778 | ||
779 | err_i1: | |
780 | if (!ioctl) | |
781 | DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", | |
782 | task_pid_nr(current), | |
783 | (long)old_encode_dev(file_priv->minor->kdev->devt), | |
784 | file_priv->authenticated, cmd, nr); | |
785 | ||
786 | if (kdata != stack_kdata) | |
787 | kfree(kdata); | |
788 | if (retcode) | |
789 | DRM_DEBUG("ret = %d\n", retcode); | |
790 | return retcode; | |
791 | } | |
792 | EXPORT_SYMBOL(drm_ioctl); | |
793 | ||
794 | /** | |
795 | * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags | |
0aaf20cf DV |
796 | * @nr: ioctl number |
797 | * @flags: where to return the ioctl permission flags | |
798 | * | |
799 | * This ioctl is only used by the vmwgfx driver to augment the access checks | |
800 | * done by the drm core and insofar a pretty decent layering violation. This | |
801 | * shouldn't be used by any drivers. | |
ec8f112d | 802 | * |
0aaf20cf DV |
803 | * Returns: |
804 | * True if the @nr corresponds to a DRM core ioctl numer, false otherwise. | |
ec8f112d DH |
805 | */ |
806 | bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) | |
807 | { | |
7ef5f82b VS |
808 | if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) |
809 | return false; | |
810 | ||
811 | if (nr >= DRM_CORE_IOCTL_COUNT) | |
812 | return false; | |
ec8f112d | 813 | |
7ef5f82b VS |
814 | *flags = drm_ioctls[nr].flags; |
815 | return true; | |
ec8f112d DH |
816 | } |
817 | EXPORT_SYMBOL(drm_ioctl_flags); |