1 /* $NetBSD: drm_ioctl.c,v 1.25 2024/04/21 03:02:51 riastradh Exp $ */
2
3 /*
4 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
5 *
6 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
7 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * All Rights Reserved.
9 *
10 * Author Rickard E. (Rik) Faith <faith@valinux.com>
11 * Author Gareth Hughes <gareth@valinux.com>
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a
14 * copy of this software and associated documentation files (the "Software"),
15 * to deal in the Software without restriction, including without limitation
16 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
17 * and/or sell copies of the Software, and to permit persons to whom the
18 * Software is furnished to do so, subject to the following conditions:
19 *
20 * The above copyright notice and this permission notice (including the next
21 * paragraph) shall be included in all copies or substantial portions of the
22 * Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
30 * OTHER DEALINGS IN THE SOFTWARE.
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: drm_ioctl.c,v 1.25 2024/04/21 03:02:51 riastradh Exp $");
35
36 #include <linux/export.h>
37 #include <linux/nospec.h>
38 #include <linux/pci.h>
39 #include <linux/uaccess.h>
40 #include <linux/capability.h>
41
42 #ifdef __NetBSD__
43 #include <sys/types.h>
44 #include <sys/file.h>
45 #endif
46
47 #include <drm/drm_agpsupport.h>
48 #include <drm/drm_auth.h>
49 #include <drm/drm_crtc.h>
50 #include <drm/drm_drv.h>
51 #include <drm/drm_file.h>
52 #include <drm/drm_ioctl.h>
53 #include <drm/drm_print.h>
54
55 #include "drm_crtc_internal.h"
56 #include "drm_internal.h"
57 #include "drm_legacy.h"
58
59 /**
60 * DOC: getunique and setversion story
61 *
62 * BEWARE THE DRAGONS! MIND THE TRAPDOORS!
63 *
64 * In an attempt to warn anyone else who's trying to figure out what's going
65 * on here, I'll try to summarize the story. First things first, let's clear up
66 * the names, because the kernel internals, libdrm and the ioctls are all named
67 * differently:
68 *
69 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
70 * through the drmGetBusid function.
71 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
72 * that code is nerved in the kernel with drm_invalid_op().
73 * - The internal set_busid kernel functions and driver callbacks are
74 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
75 * nerved) allowed userspace to set the busid through the above ioctl.
76 * - Other ioctls and functions involved are named consistently.
77 *
78 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
79 * handling pci domains in the busid on ppc. Doing this correctly was only
80 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
81 * special with drm 1.2 and 1.3.
82 *
83 * Now the actual horror story of how device lookup in drm works. At large,
84 * there's 2 different ways, either by busid, or by device driver name.
85 *
86 * Opening by busid is fairly simple:
87 *
88 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a
89 * side-effect this fills out the unique name in the master structure.
90 * 2. Call GET_UNIQUE to read out the unique name from the master structure,
91 * which matches the busid thanks to step 1. If it doesn't, proceed to try
92 * the next device node.
93 *
94 * Opening by name is slightly different:
95 *
96 * 1. Directly call VERSION to get the version and to match against the driver
97 * name returned by that ioctl. Note that SET_VERSION is not called, which
98 * means the the unique name for the master node just opening is _not_ filled
99 * out. This despite that with current drm device nodes are always bound to
100 * one device, and can't be runtime assigned like with drm 1.0.
101 * 2. Match driver name. If it mismatches, proceed to the next device node.
102 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
103 * checking that the first byte in the string is 0). If that's not the case
104 * libdrm skips and proceeds to the next device node. Probably this is just
105 * copypasta from drm 1.0 times where a set unique name meant that the driver
106 * was in use already, but that's just conjecture.
107 *
108 * Long story short: To keep the open by name logic working, GET_UNIQUE must
109 * _not_ return a unique string when SET_VERSION hasn't been called yet,
110 * otherwise libdrm breaks. Even when that unique string can't ever change, and
111 * is totally irrelevant for actually opening the device because runtime
112 * assignable device instances were only support in drm 1.0, which is long dead.
113 * But the libdrm code in drmOpenByName somehow survived, hence this can't be
114 * broken.
115 */
116
117 /*
118 * Get the bus id.
119 *
120 * \param inode device inode.
121 * \param file_priv DRM file private.
122 * \param cmd command.
123 * \param arg user argument, pointing to a drm_unique structure.
124 * \return zero on success or a negative number on failure.
125 *
126 * Copies the bus id from drm_device::unique into user space.
127 */
drm_getunique(struct drm_device * dev,void * data,struct drm_file * file_priv)128 int drm_getunique(struct drm_device *dev, void *data,
129 struct drm_file *file_priv)
130 {
131 struct drm_unique *u = data;
132 struct drm_master *master;
133 int ret;
134
135 mutex_lock(&dev->master_mutex);
136 master = dev->master;
137 if (master == NULL) {
138 ret = -ENXIO;
139 goto out;
140 }
141
142 /*
143 * Copy out only if the user allocated enough space. Either
144 * way, on success, report the actual size -- so the user can
145 * allocate enough space if they didn't before, or so they know
146 * exactly how much we copied out.
147 */
148 if (u->unique_len < master->unique_len) {
149 ret = 0;
150 } else {
151 ret = copy_to_user(u->unique, master->unique,
152 master->unique_len);
153 if (ret)
154 goto out;
155 }
156 u->unique_len = master->unique_len;
157
158 out: mutex_unlock(&dev->master_mutex);
159
160 return ret;
161 }
162
163 static void
drm_unset_busid(struct drm_device * dev,struct drm_master * master)164 drm_unset_busid(struct drm_device *dev,
165 struct drm_master *master)
166 {
167 kfree(master->unique);
168 master->unique = NULL;
169 master->unique_len = 0;
170 }
171
drm_set_busid(struct drm_device * dev,struct drm_file * file_priv)172 static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
173 {
174 struct drm_master *master = file_priv->master;
175 int ret;
176
177 if (master->unique != NULL)
178 drm_unset_busid(dev, master);
179
180 if (dev->dev && dev_is_pci(dev->dev)) {
181 ret = drm_pci_set_busid(dev, master);
182 if (ret) {
183 drm_unset_busid(dev, master);
184 return ret;
185 }
186 } else {
187 WARN_ON(!dev->unique);
188 master->unique = kstrdup(dev->unique, GFP_KERNEL);
189 if (master->unique)
190 master->unique_len = strlen(dev->unique);
191 }
192
193 return 0;
194 }
195
196 /*
197 * Get client information.
198 *
199 * \param inode device inode.
200 * \param file_priv DRM file private.
201 * \param cmd command.
202 * \param arg user argument, pointing to a drm_client structure.
203 *
204 * \return zero on success or a negative number on failure.
205 *
206 * Searches for the client with the specified index and copies its information
207 * into userspace
208 */
drm_getclient(struct drm_device * dev,void * data,struct drm_file * file_priv)209 int drm_getclient(struct drm_device *dev, void *data,
210 struct drm_file *file_priv)
211 {
212 struct drm_client *client = data;
213
214 /*
215 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
216 * not breaking completely. Userspace tools stop enumerating one they
217 * get -EINVAL, hence this is the return value we need to hand back for
218 * no clients tracked.
219 *
220 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
221 * attempt to figure out whether they're authenticated or not. Since
222 * that's the only thing they care about, give it to the directly
223 * instead of walking one giant list.
224 */
225 if (client->idx == 0) {
226 client->auth = file_priv->authenticated;
227 #ifdef __NetBSD__ /* XXX Too scary to contemplate. */
228 client->pid = curproc->p_pid;
229 client->uid = kauth_cred_geteuid(curproc->p_cred);
230 #else
231 client->pid = task_pid_vnr(current);
232 client->uid = overflowuid;
233 #endif
234 client->magic = 0;
235 client->iocs = 0;
236
237 return 0;
238 } else {
239 return -EINVAL;
240 }
241 }
242
243 /*
244 * Get statistics information.
245 *
246 * \param inode device inode.
247 * \param file_priv DRM file private.
248 * \param cmd command.
249 * \param arg user argument, pointing to a drm_stats structure.
250 *
251 * \return zero on success or a negative number on failure.
252 */
drm_getstats(struct drm_device * dev,void * data,struct drm_file * file_priv)253 static int drm_getstats(struct drm_device *dev, void *data,
254 struct drm_file *file_priv)
255 {
256 struct drm_stats *stats = data;
257
258 /* Clear stats to prevent userspace from eating its stack garbage. */
259 memset(stats, 0, sizeof(*stats));
260
261 return 0;
262 }
263
264 /*
265 * Get device/driver capabilities
266 */
drm_getcap(struct drm_device * dev,void * data,struct drm_file * file_priv)267 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
268 {
269 struct drm_get_cap *req = data;
270 struct drm_crtc *crtc;
271
272 req->value = 0;
273
274 /* Only some caps make sense with UMS/render-only drivers. */
275 switch (req->capability) {
276 case DRM_CAP_TIMESTAMP_MONOTONIC:
277 req->value = 1;
278 return 0;
279 case DRM_CAP_PRIME:
280 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
281 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
282 return 0;
283 case DRM_CAP_SYNCOBJ:
284 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ);
285 return 0;
286 case DRM_CAP_SYNCOBJ_TIMELINE:
287 req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);
288 return 0;
289 }
290
291 /* Other caps only work with KMS drivers */
292 if (!drm_core_check_feature(dev, DRIVER_MODESET))
293 return -EOPNOTSUPP;
294
295 switch (req->capability) {
296 case DRM_CAP_DUMB_BUFFER:
297 if (dev->driver->dumb_create)
298 req->value = 1;
299 break;
300 case DRM_CAP_VBLANK_HIGH_CRTC:
301 req->value = 1;
302 break;
303 case DRM_CAP_DUMB_PREFERRED_DEPTH:
304 req->value = dev->mode_config.preferred_depth;
305 break;
306 case DRM_CAP_DUMB_PREFER_SHADOW:
307 req->value = dev->mode_config.prefer_shadow;
308 break;
309 case DRM_CAP_ASYNC_PAGE_FLIP:
310 req->value = dev->mode_config.async_page_flip;
311 break;
312 case DRM_CAP_PAGE_FLIP_TARGET:
313 req->value = 1;
314 drm_for_each_crtc(crtc, dev) {
315 if (!crtc->funcs->page_flip_target)
316 req->value = 0;
317 }
318 break;
319 case DRM_CAP_CURSOR_WIDTH:
320 if (dev->mode_config.cursor_width)
321 req->value = dev->mode_config.cursor_width;
322 else
323 req->value = 64;
324 break;
325 case DRM_CAP_CURSOR_HEIGHT:
326 if (dev->mode_config.cursor_height)
327 req->value = dev->mode_config.cursor_height;
328 else
329 req->value = 64;
330 break;
331 case DRM_CAP_ADDFB2_MODIFIERS:
332 req->value = dev->mode_config.allow_fb_modifiers;
333 break;
334 case DRM_CAP_CRTC_IN_VBLANK_EVENT:
335 req->value = 1;
336 break;
337 default:
338 return -EINVAL;
339 }
340 return 0;
341 }
342
343 /*
344 * Set device/driver capabilities
345 */
346 static int
drm_setclientcap(struct drm_device * dev,void * data,struct drm_file * file_priv)347 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
348 {
349 struct drm_set_client_cap *req = data;
350
351 /* No render-only settable capabilities for now */
352
353 /* Below caps that only works with KMS drivers */
354 if (!drm_core_check_feature(dev, DRIVER_MODESET))
355 return -EOPNOTSUPP;
356
357 switch (req->capability) {
358 case DRM_CLIENT_CAP_STEREO_3D:
359 if (req->value > 1)
360 return -EINVAL;
361 file_priv->stereo_allowed = req->value;
362 break;
363 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
364 if (req->value > 1)
365 return -EINVAL;
366 file_priv->universal_planes = req->value;
367 break;
368 case DRM_CLIENT_CAP_ATOMIC:
369 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
370 return -EOPNOTSUPP;
371 /* The modesetting DDX has a totally broken idea of atomic. */
372 #ifdef __NetBSD__
373 if (current->p_comm[0] == 'X' && req->value == 1)
374 #else
375 if (current->comm[0] == 'X' && req->value == 1)
376 #endif
377 {
378 pr_info("broken atomic modeset userspace detected, disabling atomic\n");
379 return -EOPNOTSUPP;
380 }
381 if (req->value > 2)
382 return -EINVAL;
383 file_priv->atomic = req->value;
384 file_priv->universal_planes = req->value;
385 /*
386 * No atomic user-space blows up on aspect ratio mode bits.
387 */
388 file_priv->aspect_ratio_allowed = req->value;
389 break;
390 case DRM_CLIENT_CAP_ASPECT_RATIO:
391 if (req->value > 1)
392 return -EINVAL;
393 file_priv->aspect_ratio_allowed = req->value;
394 break;
395 case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS:
396 if (!file_priv->atomic)
397 return -EINVAL;
398 if (req->value > 1)
399 return -EINVAL;
400 file_priv->writeback_connectors = req->value;
401 break;
402 default:
403 return -EINVAL;
404 }
405
406 return 0;
407 }
408
409 /*
410 * Setversion ioctl.
411 *
412 * \param inode device inode.
413 * \param file_priv DRM file private.
414 * \param cmd command.
415 * \param arg user argument, pointing to a drm_lock structure.
416 * \return zero on success or negative number on failure.
417 *
418 * Sets the requested interface version
419 */
drm_setversion(struct drm_device * dev,void * data,struct drm_file * file_priv)420 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
421 {
422 struct drm_set_version *sv = data;
423 int if_version, retcode = 0;
424
425 mutex_lock(&dev->master_mutex);
426 if (sv->drm_di_major != -1) {
427 if (sv->drm_di_major != DRM_IF_MAJOR ||
428 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
429 retcode = -EINVAL;
430 goto done;
431 }
432 if_version = DRM_IF_VERSION(sv->drm_di_major,
433 sv->drm_di_minor);
434 dev->if_version = max(if_version, dev->if_version);
435 if (sv->drm_di_minor >= 1) {
436 /*
437 * Version 1.1 includes tying of DRM to specific device
438 * Version 1.4 has proper PCI domain support
439 */
440 retcode = drm_set_busid(dev, file_priv);
441 if (retcode)
442 goto done;
443 }
444 }
445
446 if (sv->drm_dd_major != -1) {
447 if (sv->drm_dd_major != dev->driver->major ||
448 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
449 dev->driver->minor) {
450 retcode = -EINVAL;
451 goto done;
452 }
453 }
454
455 done:
456 sv->drm_di_major = DRM_IF_MAJOR;
457 sv->drm_di_minor = DRM_IF_MINOR;
458 sv->drm_dd_major = dev->driver->major;
459 sv->drm_dd_minor = dev->driver->minor;
460 mutex_unlock(&dev->master_mutex);
461
462 return retcode;
463 }
464
465 /**
466 * drm_noop - DRM no-op ioctl implemntation
467 * @dev: DRM device for the ioctl
468 * @data: data pointer for the ioctl
469 * @file_priv: DRM file for the ioctl call
470 *
471 * This no-op implementation for drm ioctls is useful for deprecated
472 * functionality where we can't return a failure code because existing userspace
473 * checks the result of the ioctl, but doesn't care about the action.
474 *
475 * Always returns successfully with 0.
476 */
drm_noop(struct drm_device * dev,void * data,struct drm_file * file_priv)477 int drm_noop(struct drm_device *dev, void *data,
478 struct drm_file *file_priv)
479 {
480 DRM_DEBUG("\n");
481 return 0;
482 }
483 EXPORT_SYMBOL(drm_noop);
484
485 /**
486 * drm_invalid_op - DRM invalid ioctl implemntation
487 * @dev: DRM device for the ioctl
488 * @data: data pointer for the ioctl
489 * @file_priv: DRM file for the ioctl call
490 *
491 * This no-op implementation for drm ioctls is useful for deprecated
492 * functionality where we really don't want to allow userspace to call the ioctl
493 * any more. This is the case for old ums interfaces for drivers that
494 * transitioned to kms gradually and so kept the old legacy tables around. This
495 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
496 * use this function.
497 *
498 * Always fails with a return value of -EINVAL.
499 */
drm_invalid_op(struct drm_device * dev,void * data,struct drm_file * file_priv)500 int drm_invalid_op(struct drm_device *dev, void *data,
501 struct drm_file *file_priv)
502 {
503 return -EINVAL;
504 }
505 EXPORT_SYMBOL(drm_invalid_op);
506
507 /*
508 * Copy and IOCTL return string to user space
509 */
drm_copy_field(char __user * buf,size_t * buf_len,const char * value)510 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
511 {
512 int len;
513
514 /* don't overflow userbuf */
515 len = strlen(value);
516 if (len > *buf_len)
517 len = *buf_len;
518
519 /* let userspace know exact length of driver value (which could be
520 * larger than the userspace-supplied buffer) */
521 *buf_len = strlen(value);
522
523 /* finally, try filling in the userbuf */
524 if (len && buf)
525 if (copy_to_user(buf, value, len))
526 return -EFAULT;
527 return 0;
528 }
529
530 /*
531 * Get version information
532 *
533 * \param inode device inode.
534 * \param filp file pointer.
535 * \param cmd command.
536 * \param arg user argument, pointing to a drm_version structure.
537 * \return zero on success or negative number on failure.
538 *
539 * Fills in the version information in \p arg.
540 */
drm_version(struct drm_device * dev,void * data,struct drm_file * file_priv)541 int drm_version(struct drm_device *dev, void *data,
542 struct drm_file *file_priv)
543 {
544 struct drm_version *version = data;
545 int err;
546
547 version->version_major = dev->driver->major;
548 version->version_minor = dev->driver->minor;
549 version->version_patchlevel = dev->driver->patchlevel;
550 err = drm_copy_field(version->name, &version->name_len,
551 dev->driver->name);
552 if (!err)
553 err = drm_copy_field(version->date, &version->date_len,
554 dev->driver->date);
555 if (!err)
556 err = drm_copy_field(version->desc, &version->desc_len,
557 dev->driver->desc);
558
559 return err;
560 }
561
562 /**
563 * drm_ioctl_permit - Check ioctl permissions against caller
564 *
565 * @flags: ioctl permission flags.
566 * @file_priv: Pointer to struct drm_file identifying the caller.
567 *
568 * Checks whether the caller is allowed to run an ioctl with the
569 * indicated permissions.
570 *
571 * Returns:
572 * Zero if allowed, -EACCES otherwise.
573 */
drm_ioctl_permit(u32 flags,struct drm_file * file_priv)574 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
575 {
576 /* ROOT_ONLY is only for CAP_SYS_ADMIN */
577 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
578 return -EACCES;
579
580 /* AUTH is only for authenticated or render client */
581 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
582 !file_priv->authenticated))
583 return -EACCES;
584
585 /* MASTER is only for master or control clients */
586 if (unlikely((flags & DRM_MASTER) &&
587 !drm_is_current_master(file_priv)))
588 return -EACCES;
589
590 /* Render clients must be explicitly allowed */
591 if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
592 drm_is_render_client(file_priv)))
593 return -EACCES;
594
595 return 0;
596 }
597 EXPORT_SYMBOL(drm_ioctl_permit);
598
599 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
600 [DRM_IOCTL_NR(ioctl)] = { \
601 .cmd = ioctl, \
602 .func = _func, \
603 .flags = _flags, \
604 .name = #ioctl \
605 }
606
607 #if IS_ENABLED(CONFIG_DRM_LEGACY)
608 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags)
609 #else
610 #define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags)
611 #endif
612
613 /* Ioctl table */
614 static const struct drm_ioctl_desc drm_ioctls[] = {
615 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW),
616 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, DRM_RENDER_ALLOW),
617 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
618 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
619
620 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0),
621
622 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
623 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
624 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW),
625 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
626 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
627
628 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
629 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
630 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
631 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_MASTER),
632
633 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
634 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
635
636 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
637 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
638
639 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
640 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
641
642 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
643 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
644 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
645 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
646 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
647 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
648 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
649
650 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
651 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
652
653 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
654 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
655
656 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
657
658 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
659 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
660 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
661 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
662 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
663 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
664 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
665
666 #if IS_ENABLED(CONFIG_AGP)
667 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
668 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
669 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
670 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
671 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
672 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
673 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
674 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
675 #endif
676
677 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
678 DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
679
680 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED),
681
682 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0),
683
684 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
685
686 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW),
687 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH),
688 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH),
689
690 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0),
691
692 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW),
693 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW),
694
695 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0),
696 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0),
697 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER),
698 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0),
699 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER),
700 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER),
701 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0),
702 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER),
703 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0),
704 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0),
705 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER),
706 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER),
707 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0),
708 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER),
709 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0),
710 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0),
711 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0),
712 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0),
713 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0),
714 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER),
715 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER),
716 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0),
717 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0),
718 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0),
719 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0),
720 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER),
721 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER),
722 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER),
723 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0),
724 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0),
725
726 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl,
727 DRM_RENDER_ALLOW),
728 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl,
729 DRM_RENDER_ALLOW),
730 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl,
731 DRM_RENDER_ALLOW),
732 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
733 DRM_RENDER_ALLOW),
734 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl,
735 DRM_RENDER_ALLOW),
736 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
737 DRM_RENDER_ALLOW),
738 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl,
739 DRM_RENDER_ALLOW),
740 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl,
741 DRM_RENDER_ALLOW),
742 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl,
743 DRM_RENDER_ALLOW),
744 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl,
745 DRM_RENDER_ALLOW),
746 DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl,
747 DRM_RENDER_ALLOW),
748 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0),
749 DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0),
750 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER),
751 DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER),
752 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER),
753 DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER),
754 };
755
756 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
757
758 #ifdef __NetBSD__
759 /* ioctl suspend/resume */
760
761 static void
drm_ioctl_enter(struct drm_device * dev)762 drm_ioctl_enter(struct drm_device *dev)
763 {
764 int ret __diagused;
765
766 mutex_lock(&dev->suspend_lock);
767 DRM_WAIT_NOINTR_UNTIL(ret, &dev->suspend_cv, &dev->suspend_lock,
768 dev->suspender == NULL);
769 KASSERTMSG(ret == 0, "error=%d", -ret);
770 dev->active_ioctls++;
771 mutex_unlock(&dev->suspend_lock);
772 }
773
774 static void
drm_ioctl_exit(struct drm_device * dev)775 drm_ioctl_exit(struct drm_device *dev)
776 {
777
778 mutex_lock(&dev->suspend_lock);
779 KASSERT(dev->suspender == NULL);
780 if (--dev->active_ioctls == 0)
781 DRM_WAKEUP_ALL(&dev->suspend_cv, &dev->suspend_lock);
782 mutex_unlock(&dev->suspend_lock);
783 }
784
785 void
drm_suspend_ioctl(struct drm_device * dev)786 drm_suspend_ioctl(struct drm_device *dev)
787 {
788 int ret;
789
790 mutex_lock(&dev->suspend_lock);
791 DRM_WAIT_NOINTR_UNTIL(ret, &dev->suspend_cv, &dev->suspend_lock,
792 dev->suspender == NULL && dev->active_ioctls == 0);
793 dev->suspender = curlwp;
794 mutex_unlock(&dev->suspend_lock);
795 }
796
797 void
drm_resume_ioctl(struct drm_device * dev)798 drm_resume_ioctl(struct drm_device *dev)
799 {
800
801 mutex_lock(&dev->suspend_lock);
802 KASSERT(dev->suspender);
803 KASSERT(dev->active_ioctls == 0);
804 dev->suspender = NULL;
805 DRM_WAKEUP_ALL(&dev->suspend_cv, &dev->suspend_lock);
806 mutex_unlock(&dev->suspend_lock);
807 }
808 #endif
809
810 /**
811 * DOC: driver specific ioctls
812 *
813 * First things first, driver private IOCTLs should only be needed for drivers
814 * supporting rendering. Kernel modesetting is all standardized, and extended
815 * through properties. There are a few exceptions in some existing drivers,
816 * which define IOCTL for use by the display DRM master, but they all predate
817 * properties.
818 *
819 * Now if you do have a render driver you always have to support it through
820 * driver private properties. There's a few steps needed to wire all the things
821 * up.
822 *
823 * First you need to define the structure for your IOCTL in your driver private
824 * UAPI header in ``include/uapi/drm/my_driver_drm.h``::
825 *
826 * struct my_driver_operation {
827 * u32 some_thing;
828 * u32 another_thing;
829 * };
830 *
831 * Please make sure that you follow all the best practices from
832 * ``Documentation/ioctl/botching-up-ioctls.rst``. Note that drm_ioctl()
833 * automatically zero-extends structures, hence make sure you can add more stuff
834 * at the end, i.e. don't put a variable sized array there.
835 *
836 * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(),
837 * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix::
838 *
839 * ##define DRM_IOCTL_MY_DRIVER_OPERATION \
840 * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation)
841 *
842 * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to
843 * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire
844 * up the handlers and set the access rights::
845 *
846 * static const struct drm_ioctl_desc my_driver_ioctls[] = {
847 * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation,
848 * DRM_AUTH|DRM_RENDER_ALLOW),
849 * };
850 *
851 * And then assign this to the &drm_driver.ioctls field in your driver
852 * structure.
853 *
854 * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how
855 * the driver-specific IOCTLs are wired up.
856 */
857
drm_ioctl_kernel(struct file * file,drm_ioctl_t * func,void * kdata,u32 flags)858 long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
859 u32 flags)
860 {
861 #ifdef __NetBSD__
862 struct drm_file *file_priv = file->f_data;
863 #else
864 struct drm_file *file_priv = file->private_data;
865 #endif
866 struct drm_device *dev = file_priv->minor->dev;
867 int retcode;
868
869 if (drm_dev_is_unplugged(dev))
870 return -ENODEV;
871
872 retcode = drm_ioctl_permit(flags, file_priv);
873 if (unlikely(retcode))
874 return retcode;
875
876 drm_ioctl_enter(dev);
877
878 /* Enforce sane locking for modern driver ioctls. */
879 if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) ||
880 (flags & DRM_UNLOCKED))
881 retcode = func(dev, kdata, file_priv);
882 else {
883 mutex_lock(&drm_global_mutex);
884 retcode = func(dev, kdata, file_priv);
885 mutex_unlock(&drm_global_mutex);
886 }
887
888 drm_ioctl_exit(dev);
889
890 return retcode;
891 }
892 EXPORT_SYMBOL(drm_ioctl_kernel);
893
894 /**
895 * drm_ioctl - ioctl callback implementation for DRM drivers
896 * @filp: file this ioctl is called on
897 * @cmd: ioctl cmd number
898 * @arg: user argument
899 *
900 * Looks up the ioctl function in the DRM core and the driver dispatch table,
901 * stored in &drm_driver.ioctls. It checks for necessary permission by calling
902 * drm_ioctl_permit(), and dispatches to the respective function.
903 *
904 * Returns:
905 * Zero on success, negative error code on failure.
906 */
907 #ifdef __NetBSD__
908 #include <sys/file.h>
909 int
drm_ioctl(struct file * fp,unsigned long cmd,void * data)910 drm_ioctl(struct file *fp, unsigned long cmd, void *data)
911 {
912 char stackbuf[128] __aligned(ALIGNBYTES + 1);
913 char *buf = stackbuf;
914 void *data0 = data;
915 struct drm_file *const file = fp->f_data;
916 const unsigned int nr = DRM_IOCTL_NR(cmd);
917 int error;
918
919 switch (cmd) {
920 case FIONBIO:
921 case FIOASYNC:
922 return 0;
923 default:
924 break;
925 }
926
927 if (IOCGROUP(cmd) != DRM_IOCTL_BASE)
928 return EINVAL;
929
930 KASSERT(file != NULL);
931 KASSERT(file->minor != NULL);
932 KASSERT(file->minor->dev != NULL);
933 struct drm_device *const dev = file->minor->dev;
934 const struct drm_ioctl_desc *ioctl;
935
936 if (drm_dev_is_unplugged(dev))
937 return ENXIO;
938
939 const bool is_driver_ioctl =
940 (DRM_COMMAND_BASE <= nr) && (nr < DRM_COMMAND_END);
941
942 if (is_driver_ioctl) {
943 const unsigned int driver_nr = nr - DRM_COMMAND_BASE;
944 if (driver_nr >= dev->driver->num_ioctls)
945 return EINVAL;
946 ioctl = &dev->driver->ioctls[driver_nr];
947 } else if (nr < __arraycount(drm_ioctls)) {
948 ioctl = &drm_ioctls[nr];
949 } else {
950 ioctl = NULL;
951 }
952
953 if ((ioctl == NULL) || (ioctl->func == NULL))
954 return EINVAL;
955
956 /* XXX errno Linux->NetBSD */
957 error = -drm_ioctl_permit(ioctl->flags, file);
958 if (error)
959 return error;
960
961 /* If userland passed in too few bytes, zero-pad them. */
962 if (IOCPARM_LEN(cmd) < IOCPARM_LEN(ioctl->cmd)) {
963 /* 12-bit quantity, according to <sys/ioccom.h> */
964 KASSERT(IOCPARM_LEN(ioctl->cmd) <= 4096);
965 if (IOCPARM_LEN(ioctl->cmd) > sizeof stackbuf) {
966 buf = kmem_alloc(IOCPARM_LEN(ioctl->cmd), KM_NOSLEEP);
967 if (buf == NULL)
968 return ENOMEM;
969 }
970 memcpy(buf, data, IOCPARM_LEN(cmd));
971 memset(buf + IOCPARM_LEN(cmd), 0,
972 IOCPARM_LEN(ioctl->cmd) - IOCPARM_LEN(cmd));
973 data0 = buf;
974 }
975
976 drm_ioctl_enter(dev);
977 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) ||
978 ISSET(ioctl->flags, DRM_UNLOCKED)) {
979 /* XXX errno Linux->NetBSD */
980 error = -(*ioctl->func)(dev, data0, file);
981 } else {
982 mutex_lock(&drm_global_mutex);
983 /* XXX errno Linux->NetBSD */
984 error = -(*ioctl->func)(dev, data0, file);
985 mutex_unlock(&drm_global_mutex);
986 }
987 drm_ioctl_exit(dev);
988
989 /* If we used a temporary buffer, copy it back out. */
990 if (data != data0)
991 memcpy(data, data0, IOCPARM_LEN(cmd));
992
993 /* If we had to allocate a heap buffer, free it. */
994 if (buf != stackbuf)
995 kmem_free(buf, IOCPARM_LEN(ioctl->cmd));
996
997 return error;
998 }
999 #else
drm_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1000 long drm_ioctl(struct file *filp,
1001 unsigned int cmd, unsigned long arg)
1002 {
1003 struct drm_file *file_priv = filp->private_data;
1004 struct drm_device *dev;
1005 const struct drm_ioctl_desc *ioctl = NULL;
1006 drm_ioctl_t *func;
1007 unsigned int nr = DRM_IOCTL_NR(cmd);
1008 int retcode = -EINVAL;
1009 char stack_kdata[128];
1010 char *kdata = NULL;
1011 unsigned int in_size, out_size, drv_size, ksize;
1012 bool is_driver_ioctl;
1013
1014 dev = file_priv->minor->dev;
1015
1016 if (drm_dev_is_unplugged(dev))
1017 return -ENODEV;
1018
1019 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
1020
1021 if (is_driver_ioctl) {
1022 /* driver ioctl */
1023 unsigned int index = nr - DRM_COMMAND_BASE;
1024
1025 if (index >= dev->driver->num_ioctls)
1026 goto err_i1;
1027 index = array_index_nospec(index, dev->driver->num_ioctls);
1028 ioctl = &dev->driver->ioctls[index];
1029 } else {
1030 /* core ioctl */
1031 if (nr >= DRM_CORE_IOCTL_COUNT)
1032 goto err_i1;
1033 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
1034 ioctl = &drm_ioctls[nr];
1035 }
1036
1037 drv_size = _IOC_SIZE(ioctl->cmd);
1038 out_size = in_size = _IOC_SIZE(cmd);
1039 if ((cmd & ioctl->cmd & IOC_IN) == 0)
1040 in_size = 0;
1041 if ((cmd & ioctl->cmd & IOC_OUT) == 0)
1042 out_size = 0;
1043 ksize = max(max(in_size, out_size), drv_size);
1044
1045 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
1046 task_pid_nr(current),
1047 (long)old_encode_dev(file_priv->minor->kdev->devt),
1048 file_priv->authenticated, ioctl->name);
1049
1050 /* Do not trust userspace, use our own definition */
1051 func = ioctl->func;
1052
1053 if (unlikely(!func)) {
1054 DRM_DEBUG("no function\n");
1055 retcode = -EINVAL;
1056 goto err_i1;
1057 }
1058
1059 if (ksize <= sizeof(stack_kdata)) {
1060 kdata = stack_kdata;
1061 } else {
1062 kdata = kmalloc(ksize, GFP_KERNEL);
1063 if (!kdata) {
1064 retcode = -ENOMEM;
1065 goto err_i1;
1066 }
1067 }
1068
1069 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
1070 retcode = -EFAULT;
1071 goto err_i1;
1072 }
1073
1074 if (ksize > in_size)
1075 memset(kdata + in_size, 0, ksize - in_size);
1076
1077 retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags);
1078 if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
1079 retcode = -EFAULT;
1080
1081 err_i1:
1082 if (!ioctl)
1083 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
1084 task_pid_nr(current),
1085 (long)old_encode_dev(file_priv->minor->kdev->devt),
1086 file_priv->authenticated, cmd, nr);
1087
1088 if (kdata != stack_kdata)
1089 kfree(kdata);
1090 if (retcode)
1091 DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode);
1092 return retcode;
1093 }
1094 #endif
1095 EXPORT_SYMBOL(drm_ioctl);
1096
1097 /**
1098 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
1099 * @nr: ioctl number
1100 * @flags: where to return the ioctl permission flags
1101 *
1102 * This ioctl is only used by the vmwgfx driver to augment the access checks
1103 * done by the drm core and insofar a pretty decent layering violation. This
1104 * shouldn't be used by any drivers.
1105 *
1106 * Returns:
1107 * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
1108 */
drm_ioctl_flags(unsigned int nr,unsigned int * flags)1109 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
1110 {
1111 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
1112 return false;
1113
1114 if (nr >= DRM_CORE_IOCTL_COUNT)
1115 return false;
1116 nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
1117
1118 *flags = drm_ioctls[nr].flags;
1119 return true;
1120 }
1121 EXPORT_SYMBOL(drm_ioctl_flags);
1122