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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 <drm/drmP.h>
32#include <drm/drm_core.h>
33#include "drm_legacy.h"
34#include "drm_internal.h"
35#include "drm_crtc_internal.h"
36
37#include <linux/pci.h>
38#include <linux/export.h>
39
40static int drm_version(struct drm_device *dev, void *data,
41 struct drm_file *file_priv);
42
43/*
44 * Get the bus id.
45 *
46 * \param inode device inode.
47 * \param file_priv DRM file private.
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 */
54static int drm_getunique(struct drm_device *dev, void *data,
55 struct drm_file *file_priv)
56{
57 struct drm_unique *u = data;
58 struct drm_master *master = file_priv->master;
59
60 if (u->unique_len >= master->unique_len) {
61 if (copy_to_user(u->unique, master->unique, master->unique_len))
62 return -EFAULT;
63 }
64 u->unique_len = master->unique_len;
65
66 return 0;
67}
68
69static void
70drm_unset_busid(struct drm_device *dev,
71 struct drm_master *master)
72{
73 kfree(master->unique);
74 master->unique = NULL;
75 master->unique_len = 0;
76}
77
78/*
79 * Set the bus id.
80 *
81 * \param inode device inode.
82 * \param file_priv DRM file private.
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
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.
92 */
93static int drm_setunique(struct drm_device *dev, void *data,
94 struct drm_file *file_priv)
95{
96 struct drm_unique *u = data;
97 struct drm_master *master = file_priv->master;
98 int ret;
99
100 if (master->unique_len || master->unique)
101 return -EBUSY;
102
103 if (!u->unique_len || u->unique_len > 1024)
104 return -EINVAL;
105
106 if (drm_core_check_feature(dev, DRIVER_MODESET))
107 return 0;
108
109 if (WARN_ON(!dev->pdev))
110 return -EINVAL;
111
112 ret = drm_pci_set_unique(dev, master, u);
113 if (ret)
114 goto err;
115
116 return 0;
117
118err:
119 drm_unset_busid(dev, master);
120 return ret;
121}
122
123static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
124{
125 struct drm_master *master = file_priv->master;
126 int ret;
127
128 if (master->unique != NULL)
129 drm_unset_busid(dev, master);
130
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 }
137 } else {
138 if (WARN(dev->unique == NULL,
139 "No drm_driver.set_busid() implementation provided by "
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
149 return 0;
150}
151
152/*
153 * Get a mapping information.
154 *
155 * \param inode device inode.
156 * \param file_priv DRM file private.
157 * \param cmd command.
158 * \param arg user argument, pointing to a drm_map structure.
159 *
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 */
165static int drm_getmap(struct drm_device *dev, void *data,
166 struct drm_file *file_priv)
167{
168 struct drm_map *map = data;
169 struct drm_map_list *r_list = NULL;
170 struct list_head *list;
171 int idx;
172 int i;
173
174 idx = map->offset;
175 if (idx < 0)
176 return -EINVAL;
177
178 i = 0;
179 mutex_lock(&dev->struct_mutex);
180 list_for_each(list, &dev->maplist) {
181 if (i == idx) {
182 r_list = list_entry(list, struct drm_map_list, head);
183 break;
184 }
185 i++;
186 }
187 if (!r_list || !r_list->map) {
188 mutex_unlock(&dev->struct_mutex);
189 return -EINVAL;
190 }
191
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;
197 map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
198
199 mutex_unlock(&dev->struct_mutex);
200
201 return 0;
202}
203
204/*
205 * Get client information.
206 *
207 * \param inode device inode.
208 * \param file_priv DRM file private.
209 * \param cmd command.
210 * \param arg user argument, pointing to a drm_client structure.
211 *
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 */
217static int drm_getclient(struct drm_device *dev, void *data,
218 struct drm_file *file_priv)
219{
220 struct drm_client *client = data;
221
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;
244 }
245}
246
247/*
248 * Get statistics information.
249 *
250 * \param inode device inode.
251 * \param file_priv DRM file private.
252 * \param cmd command.
253 * \param arg user argument, pointing to a drm_stats structure.
254 *
255 * \return zero on success or a negative number on failure.
256 */
257static int drm_getstats(struct drm_device *dev, void *data,
258 struct drm_file *file_priv)
259{
260 struct drm_stats *stats = data;
261
262 /* Clear stats to prevent userspace from eating its stack garbage. */
263 memset(stats, 0, sizeof(*stats));
264
265 return 0;
266}
267
268/*
269 * Get device/driver capabilities
270 */
271static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
272{
273 struct drm_get_cap *req = data;
274
275 req->value = 0;
276 switch (req->capability) {
277 case DRM_CAP_DUMB_BUFFER:
278 if (dev->driver->dumb_create)
279 req->value = 1;
280 break;
281 case DRM_CAP_VBLANK_HIGH_CRTC:
282 req->value = 1;
283 break;
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;
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;
294 case DRM_CAP_TIMESTAMP_MONOTONIC:
295 req->value = drm_timestamp_monotonic;
296 break;
297 case DRM_CAP_ASYNC_PAGE_FLIP:
298 req->value = dev->mode_config.async_page_flip;
299 break;
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;
312 case DRM_CAP_ADDFB2_MODIFIERS:
313 req->value = dev->mode_config.allow_fb_modifiers;
314 break;
315 default:
316 return -EINVAL;
317 }
318 return 0;
319}
320
321/*
322 * Set device/driver capabilities
323 */
324static int
325drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
326{
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;
335 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
336 if (req->value > 1)
337 return -EINVAL;
338 file_priv->universal_planes = req->value;
339 break;
340 case DRM_CLIENT_CAP_ATOMIC:
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;
346 file_priv->universal_planes = req->value;
347 break;
348 default:
349 return -EINVAL;
350 }
351
352 return 0;
353}
354
355/*
356 * Setversion ioctl.
357 *
358 * \param inode device inode.
359 * \param file_priv DRM file private.
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 */
366static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
367{
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);
379 dev->if_version = max(if_version, dev->if_version);
380 if (sv->drm_di_minor >= 1) {
381 /*
382 * Version 1.1 includes tying of DRM to specific device
383 * Version 1.4 has proper PCI domain support
384 */
385 retcode = drm_set_busid(dev, file_priv);
386 if (retcode)
387 goto done;
388 }
389 }
390
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 }
398 }
399
400done:
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;
407}
408
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 */
421int drm_noop(struct drm_device *dev, void *data,
422 struct drm_file *file_priv)
423{
424 DRM_DEBUG("\n");
425 return 0;
426}
427EXPORT_SYMBOL(drm_noop);
428
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 */
444int drm_invalid_op(struct drm_device *dev, void *data,
445 struct drm_file *file_priv)
446{
447 return -EINVAL;
448}
449EXPORT_SYMBOL(drm_invalid_op);
450
451/*
452 * Copy and IOCTL return string to user space
453 */
454static 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
474/*
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 */
485static 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
506/*
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 */
516int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
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 */
528 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
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}
544EXPORT_SYMBOL(drm_ioctl_permit);
545
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 }
553
554/* Ioctl table */
555static const struct drm_ioctl_desc drm_ioctls[] = {
556 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
557 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
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
607#if IS_ENABLED(CONFIG_AGP)
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),
663 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
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),
666};
667
668#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
669
670/**
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
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.
678 *
679 * Returns:
680 * Zero on success, negative error code on failure.
681 */
682long 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;
693 unsigned int usize, asize, drv_size;
694 bool is_driver_ioctl;
695
696 dev = file_priv->minor->dev;
697
698 if (drm_device_is_unplugged(dev))
699 return -ENODEV;
700
701 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
702
703 if (is_driver_ioctl) {
704 /* driver ioctl */
705 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
706 goto err_i1;
707 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
708 } else {
709 /* core ioctl */
710 if (nr >= DRM_CORE_IOCTL_COUNT)
711 goto err_i1;
712 ioctl = &drm_ioctls[nr];
713 }
714
715 drv_size = _IOC_SIZE(ioctl->cmd);
716 usize = _IOC_SIZE(cmd);
717 asize = max(usize, drv_size);
718 cmd = ioctl->cmd;
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
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))
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}
792EXPORT_SYMBOL(drm_ioctl);
793
794/**
795 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
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.
802 *
803 * Returns:
804 * True if the @nr corresponds to a DRM core ioctl numer, false otherwise.
805 */
806bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
807{
808 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
809 return false;
810
811 if (nr >= DRM_CORE_IOCTL_COUNT)
812 return false;
813
814 *flags = drm_ioctls[nr].flags;
815 return true;
816}
817EXPORT_SYMBOL(drm_ioctl_flags);
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_agpsupport.h>
37#include <drm/drm_auth.h>
38#include <drm/drm_crtc.h>
39#include <drm/drm_drv.h>
40#include <drm/drm_file.h>
41#include <drm/drm_ioctl.h>
42#include <drm/drm_print.h>
43
44#include "drm_crtc_internal.h"
45#include "drm_internal.h"
46#include "drm_legacy.h"
47
48/**
49 * DOC: getunique and setversion story
50 *
51 * BEWARE THE DRAGONS! MIND THE TRAPDOORS!
52 *
53 * In an attempt to warn anyone else who's trying to figure out what's going
54 * on here, I'll try to summarize the story. First things first, let's clear up
55 * the names, because the kernel internals, libdrm and the ioctls are all named
56 * differently:
57 *
58 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
59 * through the drmGetBusid function.
60 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
61 * that code is nerved in the kernel with drm_invalid_op().
62 * - The internal set_busid kernel functions and driver callbacks are
63 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
64 * nerved) allowed userspace to set the busid through the above ioctl.
65 * - Other ioctls and functions involved are named consistently.
66 *
67 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
68 * handling pci domains in the busid on ppc. Doing this correctly was only
69 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
70 * special with drm 1.2 and 1.3.
71 *
72 * Now the actual horror story of how device lookup in drm works. At large,
73 * there's 2 different ways, either by busid, or by device driver name.
74 *
75 * Opening by busid is fairly simple:
76 *
77 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a
78 * side-effect this fills out the unique name in the master structure.
79 * 2. Call GET_UNIQUE to read out the unique name from the master structure,
80 * which matches the busid thanks to step 1. If it doesn't, proceed to try
81 * the next device node.
82 *
83 * Opening by name is slightly different:
84 *
85 * 1. Directly call VERSION to get the version and to match against the driver
86 * name returned by that ioctl. Note that SET_VERSION is not called, which
87 * means the the unique name for the master node just opening is _not_ filled
88 * out. This despite that with current drm device nodes are always bound to
89 * one device, and can't be runtime assigned like with drm 1.0.
90 * 2. Match driver name. If it mismatches, proceed to the next device node.
91 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
92 * checking that the first byte in the string is 0). If that's not the case
93 * libdrm skips and proceeds to the next device node. Probably this is just
94 * copypasta from drm 1.0 times where a set unique name meant that the driver
95 * was in use already, but that's just conjecture.
96 *
97 * Long story short: To keep the open by name logic working, GET_UNIQUE must
98 * _not_ return a unique string when SET_VERSION hasn't been called yet,
99 * otherwise libdrm breaks. Even when that unique string can't ever change, and
100 * is totally irrelevant for actually opening the device because runtime
101 * assignable device instances were only support in drm 1.0, which is long dead.
102 * But the libdrm code in drmOpenByName somehow survived, hence this can't be
103 * broken.
104 */
105
106/*
107 * Get the bus id.
108 *
109 * \param inode device inode.
110 * \param file_priv DRM file private.
111 * \param cmd command.
112 * \param arg user argument, pointing to a drm_unique structure.
113 * \return zero on success or a negative number on failure.
114 *
115 * Copies the bus id from drm_device::unique into user space.
116 */
117int drm_getunique(struct drm_device *dev, void *data,
118 struct drm_file *file_priv)
119{
120 struct drm_unique *u = data;
121 struct drm_master *master = file_priv->master;
122
123 mutex_lock(&master->dev->master_mutex);
124 if (u->unique_len >= master->unique_len) {
125 if (copy_to_user(u->unique, master->unique, master->unique_len)) {
126 mutex_unlock(&master->dev->master_mutex);
127 return -EFAULT;
128 }
129 }
130 u->unique_len = master->unique_len;
131 mutex_unlock(&master->dev->master_mutex);
132
133 return 0;
134}
135
136static void
137drm_unset_busid(struct drm_device *dev,
138 struct drm_master *master)
139{
140 kfree(master->unique);
141 master->unique = NULL;
142 master->unique_len = 0;
143}
144
145static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
146{
147 struct drm_master *master = file_priv->master;
148 int ret;
149
150 if (master->unique != NULL)
151 drm_unset_busid(dev, master);
152
153 if (dev->dev && dev_is_pci(dev->dev)) {
154 ret = drm_pci_set_busid(dev, master);
155 if (ret) {
156 drm_unset_busid(dev, master);
157 return ret;
158 }
159 } else {
160 WARN_ON(!dev->unique);
161 master->unique = kstrdup(dev->unique, GFP_KERNEL);
162 if (master->unique)
163 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 */
182int drm_getclient(struct drm_device *dev, void *data,
183 struct drm_file *file_priv)
184{
185 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 if (client->idx == 0) {
199 client->auth = file_priv->authenticated;
200 client->pid = task_pid_vnr(current);
201 client->uid = overflowuid;
202 client->magic = 0;
203 client->iocs = 0;
204
205 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 */
221static int drm_getstats(struct drm_device *dev, void *data,
222 struct drm_file *file_priv)
223{
224 struct drm_stats *stats = data;
225
226 /* Clear stats to prevent userspace from eating its stack garbage. */
227 memset(stats, 0, sizeof(*stats));
228
229 return 0;
230}
231
232/*
233 * Get device/driver capabilities
234 */
235static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
236{
237 struct drm_get_cap *req = data;
238 struct drm_crtc *crtc;
239
240 req->value = 0;
241
242 /* Only some caps make sense with UMS/render-only drivers. */
243 switch (req->capability) {
244 case DRM_CAP_TIMESTAMP_MONOTONIC:
245 req->value = 1;
246 return 0;
247 case DRM_CAP_PRIME:
248 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
249 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
250 return 0;
251 case DRM_CAP_SYNCOBJ:
252 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ);
253 return 0;
254 case DRM_CAP_SYNCOBJ_TIMELINE:
255 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);
256 return 0;
257 }
258
259 /* Other caps only work with KMS drivers */
260 if (!drm_core_check_feature(dev, DRIVER_MODESET))
261 return -EOPNOTSUPP;
262
263 switch (req->capability) {
264 case DRM_CAP_DUMB_BUFFER:
265 if (dev->driver->dumb_create)
266 req->value = 1;
267 break;
268 case DRM_CAP_VBLANK_HIGH_CRTC:
269 req->value = 1;
270 break;
271 case DRM_CAP_DUMB_PREFERRED_DEPTH:
272 req->value = dev->mode_config.preferred_depth;
273 break;
274 case DRM_CAP_DUMB_PREFER_SHADOW:
275 req->value = dev->mode_config.prefer_shadow;
276 break;
277 case DRM_CAP_ASYNC_PAGE_FLIP:
278 req->value = dev->mode_config.async_page_flip;
279 break;
280 case DRM_CAP_PAGE_FLIP_TARGET:
281 req->value = 1;
282 drm_for_each_crtc(crtc, dev) {
283 if (!crtc->funcs->page_flip_target)
284 req->value = 0;
285 }
286 break;
287 case DRM_CAP_CURSOR_WIDTH:
288 if (dev->mode_config.cursor_width)
289 req->value = dev->mode_config.cursor_width;
290 else
291 req->value = 64;
292 break;
293 case DRM_CAP_CURSOR_HEIGHT:
294 if (dev->mode_config.cursor_height)
295 req->value = dev->mode_config.cursor_height;
296 else
297 req->value = 64;
298 break;
299 case DRM_CAP_ADDFB2_MODIFIERS:
300 req->value = dev->mode_config.allow_fb_modifiers;
301 break;
302 case DRM_CAP_CRTC_IN_VBLANK_EVENT:
303 req->value = 1;
304 break;
305 default:
306 return -EINVAL;
307 }
308 return 0;
309}
310
311/*
312 * Set device/driver capabilities
313 */
314static int
315drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
316{
317 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 if (!drm_core_check_feature(dev, DRIVER_MODESET))
323 return -EOPNOTSUPP;
324
325 switch (req->capability) {
326 case DRM_CLIENT_CAP_STEREO_3D:
327 if (req->value > 1)
328 return -EINVAL;
329 file_priv->stereo_allowed = req->value;
330 break;
331 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
332 if (req->value > 1)
333 return -EINVAL;
334 file_priv->universal_planes = req->value;
335 break;
336 case DRM_CLIENT_CAP_ATOMIC:
337 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
338 return -EOPNOTSUPP;
339 /* The modesetting DDX has a totally broken idea of atomic. */
340 if (current->comm[0] == 'X' && req->value == 1) {
341 pr_info("broken atomic modeset userspace detected, disabling atomic\n");
342 return -EOPNOTSUPP;
343 }
344 if (req->value > 2)
345 return -EINVAL;
346 file_priv->atomic = req->value;
347 file_priv->universal_planes = req->value;
348 /*
349 * No atomic user-space blows up on aspect ratio mode bits.
350 */
351 file_priv->aspect_ratio_allowed = req->value;
352 break;
353 case DRM_CLIENT_CAP_ASPECT_RATIO:
354 if (req->value > 1)
355 return -EINVAL;
356 file_priv->aspect_ratio_allowed = req->value;
357 break;
358 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS:
359 if (!file_priv->atomic)
360 return -EINVAL;
361 if (req->value > 1)
362 return -EINVAL;
363 file_priv->writeback_connectors = req->value;
364 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 */
383static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
384{
385 struct drm_set_version *sv = data;
386 int if_version, retcode = 0;
387
388 mutex_lock(&dev->master_mutex);
389 if (sv->drm_di_major != -1) {
390 if (sv->drm_di_major != DRM_IF_MAJOR ||
391 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
392 retcode = -EINVAL;
393 goto done;
394 }
395 if_version = DRM_IF_VERSION(sv->drm_di_major,
396 sv->drm_di_minor);
397 dev->if_version = max(if_version, dev->if_version);
398 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 retcode = drm_set_busid(dev, file_priv);
404 if (retcode)
405 goto done;
406 }
407 }
408
409 if (sv->drm_dd_major != -1) {
410 if (sv->drm_dd_major != dev->driver->major ||
411 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
412 dev->driver->minor) {
413 retcode = -EINVAL;
414 goto done;
415 }
416 }
417
418done:
419 sv->drm_di_major = DRM_IF_MAJOR;
420 sv->drm_di_minor = DRM_IF_MINOR;
421 sv->drm_dd_major = dev->driver->major;
422 sv->drm_dd_minor = dev->driver->minor;
423 mutex_unlock(&dev->master_mutex);
424
425 return retcode;
426}
427
428/**
429 * drm_noop - DRM no-op ioctl implemntation
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 */
440int drm_noop(struct drm_device *dev, void *data,
441 struct drm_file *file_priv)
442{
443 DRM_DEBUG("\n");
444 return 0;
445}
446EXPORT_SYMBOL(drm_noop);
447
448/**
449 * drm_invalid_op - DRM invalid ioctl implemntation
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 */
463int drm_invalid_op(struct drm_device *dev, void *data,
464 struct drm_file *file_priv)
465{
466 return -EINVAL;
467}
468EXPORT_SYMBOL(drm_invalid_op);
469
470/*
471 * Copy and IOCTL return string to user space
472 */
473static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
474{
475 int len;
476
477 /* don't overflow userbuf */
478 len = strlen(value);
479 if (len > *buf_len)
480 len = *buf_len;
481
482 /* let userspace know exact length of driver value (which could be
483 * larger than the userspace-supplied buffer) */
484 *buf_len = strlen(value);
485
486 /* finally, try filling in the userbuf */
487 if (len && buf)
488 if (copy_to_user(buf, value, len))
489 return -EFAULT;
490 return 0;
491}
492
493/*
494 * Get version information
495 *
496 * \param inode device inode.
497 * \param filp file pointer.
498 * \param cmd command.
499 * \param arg user argument, pointing to a drm_version structure.
500 * \return zero on success or negative number on failure.
501 *
502 * Fills in the version information in \p arg.
503 */
504int drm_version(struct drm_device *dev, void *data,
505 struct drm_file *file_priv)
506{
507 struct drm_version *version = data;
508 int err;
509
510 version->version_major = dev->driver->major;
511 version->version_minor = dev->driver->minor;
512 version->version_patchlevel = dev->driver->patchlevel;
513 err = drm_copy_field(version->name, &version->name_len,
514 dev->driver->name);
515 if (!err)
516 err = drm_copy_field(version->date, &version->date_len,
517 dev->driver->date);
518 if (!err)
519 err = drm_copy_field(version->desc, &version->desc_len,
520 dev->driver->desc);
521
522 return err;
523}
524
525/**
526 * drm_ioctl_permit - Check ioctl permissions against caller
527 *
528 * @flags: ioctl permission flags.
529 * @file_priv: Pointer to struct drm_file identifying the caller.
530 *
531 * Checks whether the caller is allowed to run an ioctl with the
532 * indicated permissions.
533 *
534 * Returns:
535 * Zero if allowed, -EACCES otherwise.
536 */
537int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
538{
539 /* ROOT_ONLY is only for CAP_SYS_ADMIN */
540 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
541 return -EACCES;
542
543 /* AUTH is only for authenticated or render client */
544 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
545 !file_priv->authenticated))
546 return -EACCES;
547
548 /* MASTER is only for master or control clients */
549 if (unlikely((flags & DRM_MASTER) &&
550 !drm_is_current_master(file_priv)))
551 return -EACCES;
552
553 /* Render clients must be explicitly allowed */
554 if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
555 drm_is_render_client(file_priv)))
556 return -EACCES;
557
558 return 0;
559}
560EXPORT_SYMBOL(drm_ioctl_permit);
561
562#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
563 [DRM_IOCTL_NR(ioctl)] = { \
564 .cmd = ioctl, \
565 .func = _func, \
566 .flags = _flags, \
567 .name = #ioctl \
568 }
569
570#if IS_ENABLED(CONFIG_DRM_LEGACY)
571#define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags)
572#else
573#define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags)
574#endif
575
576/* Ioctl table */
577static const struct drm_ioctl_desc drm_ioctls[] = {
578 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW),
579 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
580 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
581 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
582
583 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0),
584
585 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
586 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
587 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW),
588 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
589 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
590
591 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
592 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
593 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
594 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER),
595
596 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
597 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
598
599 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
600 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
601
602 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
603 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
604
605 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
606 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
607 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
608 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
609 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
610 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
611 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
612
613 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
614 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
615
616 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
617 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
618
619 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
620
621 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
622 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
623 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
624 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
625 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
626 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
627 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
628
629#if IS_ENABLED(CONFIG_AGP)
630 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
631 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
632 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
633 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
634 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
635 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
636 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
637 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
638#endif
639
640 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
641 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
642
643 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED),
644
645 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0),
646
647 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
648
649 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW),
650 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH),
651 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH),
652
653 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0),
654
655 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
656 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
657
658 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0),
659 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0),
660 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER),
661 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0),
662 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER),
663 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER),
664 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0),
665 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER),
666 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0),
667 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0),
668 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER),
669 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER),
670 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0),
671 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER),
672 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0),
673 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0),
674 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0),
675 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0),
676 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0),
677 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER),
678 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER),
679 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0),
680 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0),
681 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0),
682 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0),
683 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER),
684 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER),
685 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER),
686 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0),
687 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0),
688
689 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl,
690 DRM_RENDER_ALLOW),
691 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl,
692 DRM_RENDER_ALLOW),
693 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl,
694 DRM_RENDER_ALLOW),
695 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
696 DRM_RENDER_ALLOW),
697 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl,
698 DRM_RENDER_ALLOW),
699 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
700 DRM_RENDER_ALLOW),
701 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl,
702 DRM_RENDER_ALLOW),
703 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl,
704 DRM_RENDER_ALLOW),
705 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl,
706 DRM_RENDER_ALLOW),
707 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl,
708 DRM_RENDER_ALLOW),
709 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl,
710 DRM_RENDER_ALLOW),
711 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0),
712 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0),
713 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER),
714 DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER),
715 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER),
716 DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER),
717};
718
719#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
720
721/**
722 * DOC: driver specific ioctls
723 *
724 * First things first, driver private IOCTLs should only be needed for drivers
725 * supporting rendering. Kernel modesetting is all standardized, and extended
726 * through properties. There are a few exceptions in some existing drivers,
727 * which define IOCTL for use by the display DRM master, but they all predate
728 * properties.
729 *
730 * Now if you do have a render driver you always have to support it through
731 * driver private properties. There's a few steps needed to wire all the things
732 * up.
733 *
734 * First you need to define the structure for your IOCTL in your driver private
735 * UAPI header in ``include/uapi/drm/my_driver_drm.h``::
736 *
737 * struct my_driver_operation {
738 * u32 some_thing;
739 * u32 another_thing;
740 * };
741 *
742 * Please make sure that you follow all the best practices from
743 * ``Documentation/ioctl/botching-up-ioctls.rst``. Note that drm_ioctl()
744 * automatically zero-extends structures, hence make sure you can add more stuff
745 * at the end, i.e. don't put a variable sized array there.
746 *
747 * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(),
748 * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix::
749 *
750 * ##define DRM_IOCTL_MY_DRIVER_OPERATION \
751 * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation)
752 *
753 * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to
754 * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire
755 * up the handlers and set the access rights::
756 *
757 * static const struct drm_ioctl_desc my_driver_ioctls[] = {
758 * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation,
759 * DRM_AUTH|DRM_RENDER_ALLOW),
760 * };
761 *
762 * And then assign this to the &drm_driver.ioctls field in your driver
763 * structure.
764 *
765 * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how
766 * the driver-specific IOCTLs are wired up.
767 */
768
769long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
770 u32 flags)
771{
772 struct drm_file *file_priv = file->private_data;
773 struct drm_device *dev = file_priv->minor->dev;
774 int retcode;
775
776 if (drm_dev_is_unplugged(dev))
777 return -ENODEV;
778
779 retcode = drm_ioctl_permit(flags, file_priv);
780 if (unlikely(retcode))
781 return retcode;
782
783 /* Enforce sane locking for modern driver ioctls. */
784 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) ||
785 (flags & DRM_UNLOCKED))
786 retcode = func(dev, kdata, file_priv);
787 else {
788 mutex_lock(&drm_global_mutex);
789 retcode = func(dev, kdata, file_priv);
790 mutex_unlock(&drm_global_mutex);
791 }
792 return retcode;
793}
794EXPORT_SYMBOL(drm_ioctl_kernel);
795
796/**
797 * drm_ioctl - ioctl callback implementation for DRM drivers
798 * @filp: file this ioctl is called on
799 * @cmd: ioctl cmd number
800 * @arg: user argument
801 *
802 * Looks up the ioctl function in the DRM core and the driver dispatch table,
803 * stored in &drm_driver.ioctls. It checks for necessary permission by calling
804 * drm_ioctl_permit(), and dispatches to the respective function.
805 *
806 * Returns:
807 * Zero on success, negative error code on failure.
808 */
809long drm_ioctl(struct file *filp,
810 unsigned int cmd, unsigned long arg)
811{
812 struct drm_file *file_priv = filp->private_data;
813 struct drm_device *dev;
814 const struct drm_ioctl_desc *ioctl = NULL;
815 drm_ioctl_t *func;
816 unsigned int nr = DRM_IOCTL_NR(cmd);
817 int retcode = -EINVAL;
818 char stack_kdata[128];
819 char *kdata = NULL;
820 unsigned int in_size, out_size, drv_size, ksize;
821 bool is_driver_ioctl;
822
823 dev = file_priv->minor->dev;
824
825 if (drm_dev_is_unplugged(dev))
826 return -ENODEV;
827
828 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
829
830 if (is_driver_ioctl) {
831 /* driver ioctl */
832 unsigned int index = nr - DRM_COMMAND_BASE;
833
834 if (index >= dev->driver->num_ioctls)
835 goto err_i1;
836 index = array_index_nospec(index, dev->driver->num_ioctls);
837 ioctl = &dev->driver->ioctls[index];
838 } else {
839 /* core ioctl */
840 if (nr >= DRM_CORE_IOCTL_COUNT)
841 goto err_i1;
842 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
843 ioctl = &drm_ioctls[nr];
844 }
845
846 drv_size = _IOC_SIZE(ioctl->cmd);
847 out_size = in_size = _IOC_SIZE(cmd);
848 if ((cmd & ioctl->cmd & IOC_IN) == 0)
849 in_size = 0;
850 if ((cmd & ioctl->cmd & IOC_OUT) == 0)
851 out_size = 0;
852 ksize = max(max(in_size, out_size), drv_size);
853
854 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
855 task_pid_nr(current),
856 (long)old_encode_dev(file_priv->minor->kdev->devt),
857 file_priv->authenticated, ioctl->name);
858
859 /* Do not trust userspace, use our own definition */
860 func = ioctl->func;
861
862 if (unlikely(!func)) {
863 DRM_DEBUG("no function\n");
864 retcode = -EINVAL;
865 goto err_i1;
866 }
867
868 if (ksize <= sizeof(stack_kdata)) {
869 kdata = stack_kdata;
870 } else {
871 kdata = kmalloc(ksize, GFP_KERNEL);
872 if (!kdata) {
873 retcode = -ENOMEM;
874 goto err_i1;
875 }
876 }
877
878 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
879 retcode = -EFAULT;
880 goto err_i1;
881 }
882
883 if (ksize > in_size)
884 memset(kdata + in_size, 0, ksize - in_size);
885
886 retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags);
887 if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
888 retcode = -EFAULT;
889
890 err_i1:
891 if (!ioctl)
892 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
893 task_pid_nr(current),
894 (long)old_encode_dev(file_priv->minor->kdev->devt),
895 file_priv->authenticated, cmd, nr);
896
897 if (kdata != stack_kdata)
898 kfree(kdata);
899 if (retcode)
900 DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode);
901 return retcode;
902}
903EXPORT_SYMBOL(drm_ioctl);
904
905/**
906 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
907 * @nr: ioctl number
908 * @flags: where to return the ioctl permission flags
909 *
910 * This ioctl is only used by the vmwgfx driver to augment the access checks
911 * done by the drm core and insofar a pretty decent layering violation. This
912 * shouldn't be used by any drivers.
913 *
914 * Returns:
915 * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
916 */
917bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
918{
919 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
920 return false;
921
922 if (nr >= DRM_CORE_IOCTL_COUNT)
923 return false;
924 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
925
926 *flags = drm_ioctls[nr].flags;
927 return true;
928}
929EXPORT_SYMBOL(drm_ioctl_flags);