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);