Line data Source code
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 : *
8 : * Author Rickard E. (Rik) Faith <faith@valinux.com>
9 : * Author Gareth Hughes <gareth@valinux.com>
10 : *
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 :
31 : #include <linux/export.h>
32 : #include <linux/nospec.h>
33 : #include <linux/pci.h>
34 : #include <linux/uaccess.h>
35 :
36 : #include <drm/drm_auth.h>
37 : #include <drm/drm_crtc.h>
38 : #include <drm/drm_drv.h>
39 : #include <drm/drm_file.h>
40 : #include <drm/drm_ioctl.h>
41 : #include <drm/drm_print.h>
42 :
43 : #include "drm_crtc_internal.h"
44 : #include "drm_internal.h"
45 : #include "drm_legacy.h"
46 :
47 : /**
48 : * DOC: getunique and setversion story
49 : *
50 : * BEWARE THE DRAGONS! MIND THE TRAPDOORS!
51 : *
52 : * In an attempt to warn anyone else who's trying to figure out what's going
53 : * on here, I'll try to summarize the story. First things first, let's clear up
54 : * the names, because the kernel internals, libdrm and the ioctls are all named
55 : * differently:
56 : *
57 : * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
58 : * through the drmGetBusid function.
59 : * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
60 : * that code is nerved in the kernel with drm_invalid_op().
61 : * - The internal set_busid kernel functions and driver callbacks are
62 : * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
63 : * nerved) allowed userspace to set the busid through the above ioctl.
64 : * - Other ioctls and functions involved are named consistently.
65 : *
66 : * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
67 : * handling pci domains in the busid on ppc. Doing this correctly was only
68 : * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
69 : * special with drm 1.2 and 1.3.
70 : *
71 : * Now the actual horror story of how device lookup in drm works. At large,
72 : * there's 2 different ways, either by busid, or by device driver name.
73 : *
74 : * Opening by busid is fairly simple:
75 : *
76 : * 1. First call SET_VERSION to make sure pci domains are handled properly. As a
77 : * side-effect this fills out the unique name in the master structure.
78 : * 2. Call GET_UNIQUE to read out the unique name from the master structure,
79 : * which matches the busid thanks to step 1. If it doesn't, proceed to try
80 : * the next device node.
81 : *
82 : * Opening by name is slightly different:
83 : *
84 : * 1. Directly call VERSION to get the version and to match against the driver
85 : * name returned by that ioctl. Note that SET_VERSION is not called, which
86 : * means the unique name for the master node just opening is _not_ filled
87 : * out. This despite that with current drm device nodes are always bound to
88 : * one device, and can't be runtime assigned like with drm 1.0.
89 : * 2. Match driver name. If it mismatches, proceed to the next device node.
90 : * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
91 : * checking that the first byte in the string is 0). If that's not the case
92 : * libdrm skips and proceeds to the next device node. Probably this is just
93 : * copypasta from drm 1.0 times where a set unique name meant that the driver
94 : * was in use already, but that's just conjecture.
95 : *
96 : * Long story short: To keep the open by name logic working, GET_UNIQUE must
97 : * _not_ return a unique string when SET_VERSION hasn't been called yet,
98 : * otherwise libdrm breaks. Even when that unique string can't ever change, and
99 : * is totally irrelevant for actually opening the device because runtime
100 : * assignable device instances were only support in drm 1.0, which is long dead.
101 : * But the libdrm code in drmOpenByName somehow survived, hence this can't be
102 : * broken.
103 : */
104 :
105 : /*
106 : * Get the bus id.
107 : *
108 : * \param inode device inode.
109 : * \param file_priv DRM file private.
110 : * \param cmd command.
111 : * \param arg user argument, pointing to a drm_unique structure.
112 : * \return zero on success or a negative number on failure.
113 : *
114 : * Copies the bus id from drm_device::unique into user space.
115 : */
116 0 : int drm_getunique(struct drm_device *dev, void *data,
117 : struct drm_file *file_priv)
118 : {
119 0 : struct drm_unique *u = data;
120 : struct drm_master *master;
121 :
122 0 : mutex_lock(&dev->master_mutex);
123 0 : master = file_priv->master;
124 0 : if (u->unique_len >= master->unique_len) {
125 0 : if (copy_to_user(u->unique, master->unique, master->unique_len)) {
126 0 : mutex_unlock(&dev->master_mutex);
127 0 : return -EFAULT;
128 : }
129 : }
130 0 : u->unique_len = master->unique_len;
131 0 : mutex_unlock(&dev->master_mutex);
132 :
133 0 : return 0;
134 : }
135 :
136 : static void
137 : drm_unset_busid(struct drm_device *dev,
138 : struct drm_master *master)
139 : {
140 0 : kfree(master->unique);
141 0 : master->unique = NULL;
142 0 : master->unique_len = 0;
143 : }
144 :
145 0 : static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
146 : {
147 0 : struct drm_master *master = file_priv->master;
148 : int ret;
149 :
150 0 : if (master->unique != NULL)
151 0 : drm_unset_busid(dev, master);
152 :
153 0 : if (dev->dev && dev_is_pci(dev->dev)) {
154 0 : ret = drm_pci_set_busid(dev, master);
155 0 : if (ret) {
156 0 : drm_unset_busid(dev, master);
157 : return ret;
158 : }
159 : } else {
160 0 : WARN_ON(!dev->unique);
161 0 : master->unique = kstrdup(dev->unique, GFP_KERNEL);
162 0 : if (master->unique)
163 0 : master->unique_len = strlen(dev->unique);
164 : }
165 :
166 : return 0;
167 : }
168 :
169 : /*
170 : * Get client information.
171 : *
172 : * \param inode device inode.
173 : * \param file_priv DRM file private.
174 : * \param cmd command.
175 : * \param arg user argument, pointing to a drm_client structure.
176 : *
177 : * \return zero on success or a negative number on failure.
178 : *
179 : * Searches for the client with the specified index and copies its information
180 : * into userspace
181 : */
182 0 : int drm_getclient(struct drm_device *dev, void *data,
183 : struct drm_file *file_priv)
184 : {
185 0 : struct drm_client *client = data;
186 :
187 : /*
188 : * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
189 : * not breaking completely. Userspace tools stop enumerating one they
190 : * get -EINVAL, hence this is the return value we need to hand back for
191 : * no clients tracked.
192 : *
193 : * Unfortunately some clients (*cough* libva *cough*) use this in a fun
194 : * attempt to figure out whether they're authenticated or not. Since
195 : * that's the only thing they care about, give it to the directly
196 : * instead of walking one giant list.
197 : */
198 0 : if (client->idx == 0) {
199 0 : client->auth = file_priv->authenticated;
200 0 : client->pid = task_pid_vnr(current);
201 0 : client->uid = overflowuid;
202 0 : client->magic = 0;
203 0 : client->iocs = 0;
204 :
205 0 : return 0;
206 : } else {
207 : return -EINVAL;
208 : }
209 : }
210 :
211 : /*
212 : * Get statistics information.
213 : *
214 : * \param inode device inode.
215 : * \param file_priv DRM file private.
216 : * \param cmd command.
217 : * \param arg user argument, pointing to a drm_stats structure.
218 : *
219 : * \return zero on success or a negative number on failure.
220 : */
221 0 : static int drm_getstats(struct drm_device *dev, void *data,
222 : struct drm_file *file_priv)
223 : {
224 0 : struct drm_stats *stats = data;
225 :
226 : /* Clear stats to prevent userspace from eating its stack garbage. */
227 0 : memset(stats, 0, sizeof(*stats));
228 :
229 0 : return 0;
230 : }
231 :
232 : /*
233 : * Get device/driver capabilities
234 : */
235 0 : static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
236 : {
237 0 : struct drm_get_cap *req = data;
238 : struct drm_crtc *crtc;
239 :
240 0 : req->value = 0;
241 :
242 : /* Only some caps make sense with UMS/render-only drivers. */
243 0 : switch (req->capability) {
244 : case DRM_CAP_TIMESTAMP_MONOTONIC:
245 0 : req->value = 1;
246 0 : return 0;
247 : case DRM_CAP_PRIME:
248 0 : req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
249 0 : req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
250 0 : return 0;
251 : case DRM_CAP_SYNCOBJ:
252 0 : req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ);
253 0 : return 0;
254 : case DRM_CAP_SYNCOBJ_TIMELINE:
255 0 : req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);
256 0 : return 0;
257 : }
258 :
259 : /* Other caps only work with KMS drivers */
260 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
261 : return -EOPNOTSUPP;
262 :
263 0 : switch (req->capability) {
264 : case DRM_CAP_DUMB_BUFFER:
265 0 : if (dev->driver->dumb_create)
266 0 : req->value = 1;
267 : break;
268 : case DRM_CAP_VBLANK_HIGH_CRTC:
269 0 : req->value = 1;
270 0 : break;
271 : case DRM_CAP_DUMB_PREFERRED_DEPTH:
272 0 : req->value = dev->mode_config.preferred_depth;
273 0 : break;
274 : case DRM_CAP_DUMB_PREFER_SHADOW:
275 0 : req->value = dev->mode_config.prefer_shadow;
276 0 : break;
277 : case DRM_CAP_ASYNC_PAGE_FLIP:
278 0 : req->value = dev->mode_config.async_page_flip;
279 0 : break;
280 : case DRM_CAP_PAGE_FLIP_TARGET:
281 0 : req->value = 1;
282 0 : drm_for_each_crtc(crtc, dev) {
283 0 : if (!crtc->funcs->page_flip_target)
284 0 : req->value = 0;
285 : }
286 : break;
287 : case DRM_CAP_CURSOR_WIDTH:
288 0 : if (dev->mode_config.cursor_width)
289 0 : req->value = dev->mode_config.cursor_width;
290 : else
291 0 : req->value = 64;
292 : break;
293 : case DRM_CAP_CURSOR_HEIGHT:
294 0 : if (dev->mode_config.cursor_height)
295 0 : req->value = dev->mode_config.cursor_height;
296 : else
297 0 : req->value = 64;
298 : break;
299 : case DRM_CAP_ADDFB2_MODIFIERS:
300 0 : req->value = !dev->mode_config.fb_modifiers_not_supported;
301 0 : break;
302 : case DRM_CAP_CRTC_IN_VBLANK_EVENT:
303 0 : req->value = 1;
304 0 : break;
305 : default:
306 : return -EINVAL;
307 : }
308 : return 0;
309 : }
310 :
311 : /*
312 : * Set device/driver capabilities
313 : */
314 : static int
315 0 : drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
316 : {
317 0 : struct drm_set_client_cap *req = data;
318 :
319 : /* No render-only settable capabilities for now */
320 :
321 : /* Below caps that only works with KMS drivers */
322 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
323 : return -EOPNOTSUPP;
324 :
325 0 : switch (req->capability) {
326 : case DRM_CLIENT_CAP_STEREO_3D:
327 0 : if (req->value > 1)
328 : return -EINVAL;
329 0 : file_priv->stereo_allowed = req->value;
330 0 : break;
331 : case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
332 0 : if (req->value > 1)
333 : return -EINVAL;
334 0 : file_priv->universal_planes = req->value;
335 0 : break;
336 : case DRM_CLIENT_CAP_ATOMIC:
337 0 : if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
338 : return -EOPNOTSUPP;
339 : /* The modesetting DDX has a totally broken idea of atomic. */
340 0 : if (current->comm[0] == 'X' && req->value == 1) {
341 0 : pr_info("broken atomic modeset userspace detected, disabling atomic\n");
342 0 : return -EOPNOTSUPP;
343 : }
344 0 : if (req->value > 2)
345 : return -EINVAL;
346 0 : file_priv->atomic = req->value;
347 0 : file_priv->universal_planes = req->value;
348 : /*
349 : * No atomic user-space blows up on aspect ratio mode bits.
350 : */
351 0 : file_priv->aspect_ratio_allowed = req->value;
352 0 : break;
353 : case DRM_CLIENT_CAP_ASPECT_RATIO:
354 0 : if (req->value > 1)
355 : return -EINVAL;
356 0 : file_priv->aspect_ratio_allowed = req->value;
357 0 : break;
358 : case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS:
359 0 : if (!file_priv->atomic)
360 : return -EINVAL;
361 0 : if (req->value > 1)
362 : return -EINVAL;
363 0 : file_priv->writeback_connectors = req->value;
364 0 : break;
365 : default:
366 : return -EINVAL;
367 : }
368 :
369 : return 0;
370 : }
371 :
372 : /*
373 : * Setversion ioctl.
374 : *
375 : * \param inode device inode.
376 : * \param file_priv DRM file private.
377 : * \param cmd command.
378 : * \param arg user argument, pointing to a drm_lock structure.
379 : * \return zero on success or negative number on failure.
380 : *
381 : * Sets the requested interface version
382 : */
383 0 : static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
384 : {
385 0 : struct drm_set_version *sv = data;
386 0 : int if_version, retcode = 0;
387 :
388 0 : mutex_lock(&dev->master_mutex);
389 0 : if (sv->drm_di_major != -1) {
390 0 : if (sv->drm_di_major != DRM_IF_MAJOR ||
391 0 : sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
392 : retcode = -EINVAL;
393 : goto done;
394 : }
395 0 : if_version = DRM_IF_VERSION(sv->drm_di_major,
396 : sv->drm_di_minor);
397 0 : dev->if_version = max(if_version, dev->if_version);
398 0 : if (sv->drm_di_minor >= 1) {
399 : /*
400 : * Version 1.1 includes tying of DRM to specific device
401 : * Version 1.4 has proper PCI domain support
402 : */
403 0 : retcode = drm_set_busid(dev, file_priv);
404 0 : if (retcode)
405 : goto done;
406 : }
407 : }
408 :
409 0 : if (sv->drm_dd_major != -1) {
410 0 : if (sv->drm_dd_major != dev->driver->major ||
411 0 : sv->drm_dd_minor < 0 || sv->drm_dd_minor >
412 0 : dev->driver->minor) {
413 0 : retcode = -EINVAL;
414 0 : goto done;
415 : }
416 : }
417 :
418 : done:
419 0 : sv->drm_di_major = DRM_IF_MAJOR;
420 0 : sv->drm_di_minor = DRM_IF_MINOR;
421 0 : sv->drm_dd_major = dev->driver->major;
422 0 : sv->drm_dd_minor = dev->driver->minor;
423 0 : mutex_unlock(&dev->master_mutex);
424 :
425 0 : return retcode;
426 : }
427 :
428 : /**
429 : * drm_noop - DRM no-op ioctl implementation
430 : * @dev: DRM device for the ioctl
431 : * @data: data pointer for the ioctl
432 : * @file_priv: DRM file for the ioctl call
433 : *
434 : * This no-op implementation for drm ioctls is useful for deprecated
435 : * functionality where we can't return a failure code because existing userspace
436 : * checks the result of the ioctl, but doesn't care about the action.
437 : *
438 : * Always returns successfully with 0.
439 : */
440 0 : int drm_noop(struct drm_device *dev, void *data,
441 : struct drm_file *file_priv)
442 : {
443 0 : drm_dbg_core(dev, "\n");
444 0 : return 0;
445 : }
446 : EXPORT_SYMBOL(drm_noop);
447 :
448 : /**
449 : * drm_invalid_op - DRM invalid ioctl implementation
450 : * @dev: DRM device for the ioctl
451 : * @data: data pointer for the ioctl
452 : * @file_priv: DRM file for the ioctl call
453 : *
454 : * This no-op implementation for drm ioctls is useful for deprecated
455 : * functionality where we really don't want to allow userspace to call the ioctl
456 : * any more. This is the case for old ums interfaces for drivers that
457 : * transitioned to kms gradually and so kept the old legacy tables around. This
458 : * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
459 : * use this function.
460 : *
461 : * Always fails with a return value of -EINVAL.
462 : */
463 0 : int drm_invalid_op(struct drm_device *dev, void *data,
464 : struct drm_file *file_priv)
465 : {
466 0 : return -EINVAL;
467 : }
468 : EXPORT_SYMBOL(drm_invalid_op);
469 :
470 : /*
471 : * Copy and IOCTL return string to user space
472 : */
473 0 : static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
474 : {
475 : size_t len;
476 :
477 : /* don't attempt to copy a NULL pointer */
478 0 : if (WARN_ONCE(!value, "BUG: the value to copy was not set!")) {
479 0 : *buf_len = 0;
480 0 : return 0;
481 : }
482 :
483 : /* don't overflow userbuf */
484 0 : len = strlen(value);
485 0 : if (len > *buf_len)
486 0 : len = *buf_len;
487 :
488 : /* let userspace know exact length of driver value (which could be
489 : * larger than the userspace-supplied buffer) */
490 0 : *buf_len = strlen(value);
491 :
492 : /* finally, try filling in the userbuf */
493 0 : if (len && buf)
494 0 : if (copy_to_user(buf, value, len))
495 : return -EFAULT;
496 : return 0;
497 : }
498 :
499 : /*
500 : * Get version information
501 : *
502 : * \param inode device inode.
503 : * \param filp file pointer.
504 : * \param cmd command.
505 : * \param arg user argument, pointing to a drm_version structure.
506 : * \return zero on success or negative number on failure.
507 : *
508 : * Fills in the version information in \p arg.
509 : */
510 0 : int drm_version(struct drm_device *dev, void *data,
511 : struct drm_file *file_priv)
512 : {
513 0 : struct drm_version *version = data;
514 : int err;
515 :
516 0 : version->version_major = dev->driver->major;
517 0 : version->version_minor = dev->driver->minor;
518 0 : version->version_patchlevel = dev->driver->patchlevel;
519 0 : err = drm_copy_field(version->name, &version->name_len,
520 0 : dev->driver->name);
521 0 : if (!err)
522 0 : err = drm_copy_field(version->date, &version->date_len,
523 0 : dev->driver->date);
524 0 : if (!err)
525 0 : err = drm_copy_field(version->desc, &version->desc_len,
526 0 : dev->driver->desc);
527 :
528 0 : return err;
529 : }
530 :
531 0 : static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
532 : {
533 : /* ROOT_ONLY is only for CAP_SYS_ADMIN */
534 0 : if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
535 : return -EACCES;
536 :
537 : /* AUTH is only for authenticated or render client */
538 0 : if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
539 : !file_priv->authenticated))
540 : return -EACCES;
541 :
542 : /* MASTER is only for master or control clients */
543 0 : if (unlikely((flags & DRM_MASTER) &&
544 : !drm_is_current_master(file_priv)))
545 : return -EACCES;
546 :
547 : /* Render clients must be explicitly allowed */
548 0 : if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
549 : drm_is_render_client(file_priv)))
550 : return -EACCES;
551 :
552 : return 0;
553 : }
554 :
555 : #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
556 : [DRM_IOCTL_NR(ioctl)] = { \
557 : .cmd = ioctl, \
558 : .func = _func, \
559 : .flags = _flags, \
560 : .name = #ioctl \
561 : }
562 :
563 : #if IS_ENABLED(CONFIG_DRM_LEGACY)
564 : #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags)
565 : #else
566 : #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags)
567 : #endif
568 :
569 : /* Ioctl table */
570 : static const struct drm_ioctl_desc drm_ioctls[] = {
571 : DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW),
572 : DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
573 : DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
574 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_legacy_irq_by_busid,
575 : DRM_MASTER|DRM_ROOT_ONLY),
576 :
577 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0),
578 :
579 : DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
580 : DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
581 : DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW),
582 : DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
583 : DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
584 :
585 : DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
586 : DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
587 : DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
588 : DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER),
589 :
590 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
591 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
592 :
593 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
594 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
595 :
596 : DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, 0),
597 : DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, 0),
598 :
599 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
600 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
601 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
602 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
603 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
604 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
605 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
606 :
607 : DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
608 : DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
609 :
610 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
611 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
612 :
613 : DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
614 :
615 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
616 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
617 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
618 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
619 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
620 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
621 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
622 :
623 : #if IS_ENABLED(CONFIG_AGP)
624 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_legacy_agp_acquire_ioctl,
625 : DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
626 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_legacy_agp_release_ioctl,
627 : DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
628 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_legacy_agp_enable_ioctl,
629 : DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
630 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_legacy_agp_info_ioctl, DRM_AUTH),
631 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_legacy_agp_alloc_ioctl,
632 : DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
633 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_legacy_agp_free_ioctl,
634 : DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
635 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_legacy_agp_bind_ioctl,
636 : DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
637 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_legacy_agp_unbind_ioctl,
638 : DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
639 : #endif
640 :
641 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
642 : DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
643 :
644 : DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED),
645 :
646 : DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0),
647 :
648 : DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
649 :
650 : DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW),
651 : DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH),
652 : DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH),
653 :
654 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0),
655 :
656 : DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW),
657 : DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW),
658 :
659 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0),
660 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0),
661 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER),
662 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0),
663 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER),
664 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER),
665 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0),
666 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER),
667 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0),
668 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0),
669 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER),
670 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER),
671 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0),
672 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER),
673 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0),
674 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0),
675 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB2, drm_mode_getfb2_ioctl, 0),
676 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0),
677 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0),
678 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0),
679 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER),
680 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER),
681 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0),
682 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0),
683 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0),
684 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0),
685 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER),
686 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER),
687 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER),
688 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0),
689 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0),
690 :
691 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl,
692 : DRM_RENDER_ALLOW),
693 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl,
694 : DRM_RENDER_ALLOW),
695 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl,
696 : DRM_RENDER_ALLOW),
697 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
698 : DRM_RENDER_ALLOW),
699 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl,
700 : DRM_RENDER_ALLOW),
701 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
702 : DRM_RENDER_ALLOW),
703 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl,
704 : DRM_RENDER_ALLOW),
705 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl,
706 : DRM_RENDER_ALLOW),
707 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl,
708 : DRM_RENDER_ALLOW),
709 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl,
710 : DRM_RENDER_ALLOW),
711 : DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl,
712 : DRM_RENDER_ALLOW),
713 : DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0),
714 : DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0),
715 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER),
716 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER),
717 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER),
718 : DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER),
719 : };
720 :
721 : #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE(drm_ioctls)
722 :
723 : /**
724 : * DOC: driver specific ioctls
725 : *
726 : * First things first, driver private IOCTLs should only be needed for drivers
727 : * supporting rendering. Kernel modesetting is all standardized, and extended
728 : * through properties. There are a few exceptions in some existing drivers,
729 : * which define IOCTL for use by the display DRM master, but they all predate
730 : * properties.
731 : *
732 : * Now if you do have a render driver you always have to support it through
733 : * driver private properties. There's a few steps needed to wire all the things
734 : * up.
735 : *
736 : * First you need to define the structure for your IOCTL in your driver private
737 : * UAPI header in ``include/uapi/drm/my_driver_drm.h``::
738 : *
739 : * struct my_driver_operation {
740 : * u32 some_thing;
741 : * u32 another_thing;
742 : * };
743 : *
744 : * Please make sure that you follow all the best practices from
745 : * ``Documentation/process/botching-up-ioctls.rst``. Note that drm_ioctl()
746 : * automatically zero-extends structures, hence make sure you can add more stuff
747 : * at the end, i.e. don't put a variable sized array there.
748 : *
749 : * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(),
750 : * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix::
751 : *
752 : * ##define DRM_IOCTL_MY_DRIVER_OPERATION \
753 : * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation)
754 : *
755 : * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to
756 : * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire
757 : * up the handlers and set the access rights::
758 : *
759 : * static const struct drm_ioctl_desc my_driver_ioctls[] = {
760 : * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation,
761 : * DRM_AUTH|DRM_RENDER_ALLOW),
762 : * };
763 : *
764 : * And then assign this to the &drm_driver.ioctls field in your driver
765 : * structure.
766 : *
767 : * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how
768 : * the driver-specific IOCTLs are wired up.
769 : */
770 :
771 0 : long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
772 : u32 flags)
773 : {
774 0 : struct drm_file *file_priv = file->private_data;
775 0 : struct drm_device *dev = file_priv->minor->dev;
776 : int retcode;
777 :
778 0 : if (drm_dev_is_unplugged(dev))
779 : return -ENODEV;
780 :
781 0 : retcode = drm_ioctl_permit(flags, file_priv);
782 0 : if (unlikely(retcode))
783 0 : return retcode;
784 :
785 : /* Enforce sane locking for modern driver ioctls. */
786 0 : if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) ||
787 0 : (flags & DRM_UNLOCKED))
788 0 : retcode = func(dev, kdata, file_priv);
789 : else {
790 0 : mutex_lock(&drm_global_mutex);
791 0 : retcode = func(dev, kdata, file_priv);
792 0 : mutex_unlock(&drm_global_mutex);
793 : }
794 0 : return retcode;
795 : }
796 : EXPORT_SYMBOL(drm_ioctl_kernel);
797 :
798 : /**
799 : * drm_ioctl - ioctl callback implementation for DRM drivers
800 : * @filp: file this ioctl is called on
801 : * @cmd: ioctl cmd number
802 : * @arg: user argument
803 : *
804 : * Looks up the ioctl function in the DRM core and the driver dispatch table,
805 : * stored in &drm_driver.ioctls. It checks for necessary permission by calling
806 : * drm_ioctl_permit(), and dispatches to the respective function.
807 : *
808 : * Returns:
809 : * Zero on success, negative error code on failure.
810 : */
811 0 : long drm_ioctl(struct file *filp,
812 : unsigned int cmd, unsigned long arg)
813 : {
814 0 : struct drm_file *file_priv = filp->private_data;
815 : struct drm_device *dev;
816 0 : const struct drm_ioctl_desc *ioctl = NULL;
817 : drm_ioctl_t *func;
818 0 : unsigned int nr = DRM_IOCTL_NR(cmd);
819 0 : int retcode = -EINVAL;
820 : char stack_kdata[128];
821 0 : char *kdata = NULL;
822 : unsigned int in_size, out_size, drv_size, ksize;
823 : bool is_driver_ioctl;
824 :
825 0 : dev = file_priv->minor->dev;
826 :
827 0 : if (drm_dev_is_unplugged(dev))
828 : return -ENODEV;
829 :
830 0 : if (DRM_IOCTL_TYPE(cmd) != DRM_IOCTL_BASE)
831 : return -ENOTTY;
832 :
833 0 : is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
834 :
835 0 : if (is_driver_ioctl) {
836 : /* driver ioctl */
837 0 : unsigned int index = nr - DRM_COMMAND_BASE;
838 :
839 0 : if (index >= dev->driver->num_ioctls)
840 : goto err_i1;
841 0 : index = array_index_nospec(index, dev->driver->num_ioctls);
842 0 : ioctl = &dev->driver->ioctls[index];
843 : } else {
844 : /* core ioctl */
845 0 : if (nr >= DRM_CORE_IOCTL_COUNT)
846 : goto err_i1;
847 0 : nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
848 0 : ioctl = &drm_ioctls[nr];
849 : }
850 :
851 0 : drv_size = _IOC_SIZE(ioctl->cmd);
852 0 : out_size = in_size = _IOC_SIZE(cmd);
853 0 : if ((cmd & ioctl->cmd & IOC_IN) == 0)
854 0 : in_size = 0;
855 0 : if ((cmd & ioctl->cmd & IOC_OUT) == 0)
856 0 : out_size = 0;
857 0 : ksize = max(max(in_size, out_size), drv_size);
858 :
859 0 : drm_dbg_core(dev, "comm=\"%s\" pid=%d, dev=0x%lx, auth=%d, %s\n",
860 : current->comm, task_pid_nr(current),
861 : (long)old_encode_dev(file_priv->minor->kdev->devt),
862 : file_priv->authenticated, ioctl->name);
863 :
864 : /* Do not trust userspace, use our own definition */
865 0 : func = ioctl->func;
866 :
867 0 : if (unlikely(!func)) {
868 0 : drm_dbg_core(dev, "no function\n");
869 0 : retcode = -EINVAL;
870 0 : goto err_i1;
871 : }
872 :
873 0 : if (ksize <= sizeof(stack_kdata)) {
874 : kdata = stack_kdata;
875 : } else {
876 0 : kdata = kmalloc(ksize, GFP_KERNEL);
877 0 : if (!kdata) {
878 : retcode = -ENOMEM;
879 : goto err_i1;
880 : }
881 : }
882 :
883 0 : if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
884 : retcode = -EFAULT;
885 : goto err_i1;
886 : }
887 :
888 0 : if (ksize > in_size)
889 0 : memset(kdata + in_size, 0, ksize - in_size);
890 :
891 0 : retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags);
892 0 : if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
893 0 : retcode = -EFAULT;
894 :
895 : err_i1:
896 0 : if (!ioctl)
897 0 : drm_dbg_core(dev,
898 : "invalid ioctl: comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
899 : current->comm, task_pid_nr(current),
900 : (long)old_encode_dev(file_priv->minor->kdev->devt),
901 : file_priv->authenticated, cmd, nr);
902 :
903 0 : if (kdata != stack_kdata)
904 0 : kfree(kdata);
905 0 : if (retcode)
906 0 : drm_dbg_core(dev, "comm=\"%s\", pid=%d, ret=%d\n",
907 : current->comm, task_pid_nr(current), retcode);
908 0 : return retcode;
909 : }
910 : EXPORT_SYMBOL(drm_ioctl);
911 :
912 : /**
913 : * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
914 : * @nr: ioctl number
915 : * @flags: where to return the ioctl permission flags
916 : *
917 : * This ioctl is only used by the vmwgfx driver to augment the access checks
918 : * done by the drm core and insofar a pretty decent layering violation. This
919 : * shouldn't be used by any drivers.
920 : *
921 : * Returns:
922 : * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
923 : */
924 0 : bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
925 : {
926 0 : if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
927 : return false;
928 :
929 0 : if (nr >= DRM_CORE_IOCTL_COUNT)
930 : return false;
931 0 : nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
932 :
933 0 : *flags = drm_ioctls[nr].flags;
934 0 : return true;
935 : }
936 : EXPORT_SYMBOL(drm_ioctl_flags);
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