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1/**
2 * \file drm_ioctl.c
3 * IOCTL processing for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include "drmP.h"
37#include "drm_core.h"
38
39#include "linux/pci.h"
40
41/**
42 * Get the bus id.
43 *
44 * \param inode device inode.
45 * \param file_priv DRM file private.
46 * \param cmd command.
47 * \param arg user argument, pointing to a drm_unique structure.
48 * \return zero on success or a negative number on failure.
49 *
50 * Copies the bus id from drm_device::unique into user space.
51 */
52int drm_getunique(struct drm_device *dev, void *data,
53 struct drm_file *file_priv)
54{
55 struct drm_unique *u = data;
56 struct drm_master *master = file_priv->master;
57
58 if (u->unique_len >= master->unique_len) {
59 if (copy_to_user(u->unique, master->unique, master->unique_len))
60 return -EFAULT;
61 }
62 u->unique_len = master->unique_len;
63
64 return 0;
65}
66
67static void
68drm_unset_busid(struct drm_device *dev,
69 struct drm_master *master)
70{
71 kfree(dev->devname);
72 dev->devname = NULL;
73
74 kfree(master->unique);
75 master->unique = NULL;
76 master->unique_len = 0;
77 master->unique_size = 0;
78}
79
80/**
81 * Set the bus id.
82 *
83 * \param inode device inode.
84 * \param file_priv DRM file private.
85 * \param cmd command.
86 * \param arg user argument, pointing to a drm_unique structure.
87 * \return zero on success or a negative number on failure.
88 *
89 * Copies the bus id from userspace into drm_device::unique, and verifies that
90 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
91 * in interface version 1.1 and will return EBUSY when setversion has requested
92 * version 1.1 or greater.
93 */
94int drm_setunique(struct drm_device *dev, void *data,
95 struct drm_file *file_priv)
96{
97 struct drm_unique *u = data;
98 struct drm_master *master = file_priv->master;
99 int ret;
100
101 if (master->unique_len || master->unique)
102 return -EBUSY;
103
104 if (!u->unique_len || u->unique_len > 1024)
105 return -EINVAL;
106
107 if (!dev->driver->bus->set_unique)
108 return -EINVAL;
109
110 ret = dev->driver->bus->set_unique(dev, master, u);
111 if (ret)
112 goto err;
113
114 return 0;
115
116err:
117 drm_unset_busid(dev, master);
118 return ret;
119}
120
121static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
122{
123 struct drm_master *master = file_priv->master;
124 int ret;
125
126 if (master->unique != NULL)
127 drm_unset_busid(dev, master);
128
129 ret = dev->driver->bus->set_busid(dev, master);
130 if (ret)
131 goto err;
132 return 0;
133err:
134 drm_unset_busid(dev, master);
135 return ret;
136}
137
138/**
139 * Get a mapping information.
140 *
141 * \param inode device inode.
142 * \param file_priv DRM file private.
143 * \param cmd command.
144 * \param arg user argument, pointing to a drm_map structure.
145 *
146 * \return zero on success or a negative number on failure.
147 *
148 * Searches for the mapping with the specified offset and copies its information
149 * into userspace
150 */
151int drm_getmap(struct drm_device *dev, void *data,
152 struct drm_file *file_priv)
153{
154 struct drm_map *map = data;
155 struct drm_map_list *r_list = NULL;
156 struct list_head *list;
157 int idx;
158 int i;
159
160 idx = map->offset;
161
162 mutex_lock(&dev->struct_mutex);
163 if (idx < 0) {
164 mutex_unlock(&dev->struct_mutex);
165 return -EINVAL;
166 }
167
168 i = 0;
169 list_for_each(list, &dev->maplist) {
170 if (i == idx) {
171 r_list = list_entry(list, struct drm_map_list, head);
172 break;
173 }
174 i++;
175 }
176 if (!r_list || !r_list->map) {
177 mutex_unlock(&dev->struct_mutex);
178 return -EINVAL;
179 }
180
181 map->offset = r_list->map->offset;
182 map->size = r_list->map->size;
183 map->type = r_list->map->type;
184 map->flags = r_list->map->flags;
185 map->handle = (void *)(unsigned long) r_list->user_token;
186 map->mtrr = r_list->map->mtrr;
187 mutex_unlock(&dev->struct_mutex);
188
189 return 0;
190}
191
192/**
193 * Get client information.
194 *
195 * \param inode device inode.
196 * \param file_priv DRM file private.
197 * \param cmd command.
198 * \param arg user argument, pointing to a drm_client structure.
199 *
200 * \return zero on success or a negative number on failure.
201 *
202 * Searches for the client with the specified index and copies its information
203 * into userspace
204 */
205int drm_getclient(struct drm_device *dev, void *data,
206 struct drm_file *file_priv)
207{
208 struct drm_client *client = data;
209 struct drm_file *pt;
210 int idx;
211 int i;
212
213 idx = client->idx;
214 mutex_lock(&dev->struct_mutex);
215
216 i = 0;
217 list_for_each_entry(pt, &dev->filelist, lhead) {
218 if (i++ >= idx) {
219 client->auth = pt->authenticated;
220 client->pid = pt->pid;
221 client->uid = pt->uid;
222 client->magic = pt->magic;
223 client->iocs = pt->ioctl_count;
224 mutex_unlock(&dev->struct_mutex);
225
226 return 0;
227 }
228 }
229 mutex_unlock(&dev->struct_mutex);
230
231 return -EINVAL;
232}
233
234/**
235 * Get statistics information.
236 *
237 * \param inode device inode.
238 * \param file_priv DRM file private.
239 * \param cmd command.
240 * \param arg user argument, pointing to a drm_stats structure.
241 *
242 * \return zero on success or a negative number on failure.
243 */
244int drm_getstats(struct drm_device *dev, void *data,
245 struct drm_file *file_priv)
246{
247 struct drm_stats *stats = data;
248 int i;
249
250 memset(stats, 0, sizeof(*stats));
251
252 mutex_lock(&dev->struct_mutex);
253
254 for (i = 0; i < dev->counters; i++) {
255 if (dev->types[i] == _DRM_STAT_LOCK)
256 stats->data[i].value =
257 (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
258 else
259 stats->data[i].value = atomic_read(&dev->counts[i]);
260 stats->data[i].type = dev->types[i];
261 }
262
263 stats->count = dev->counters;
264
265 mutex_unlock(&dev->struct_mutex);
266
267 return 0;
268}
269
270/**
271 * Get device/driver capabilities
272 */
273int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
274{
275 struct drm_get_cap *req = data;
276
277 req->value = 0;
278 switch (req->capability) {
279 case DRM_CAP_DUMB_BUFFER:
280 if (dev->driver->dumb_create)
281 req->value = 1;
282 break;
283 case DRM_CAP_VBLANK_HIGH_CRTC:
284 req->value = 1;
285 break;
286 default:
287 return -EINVAL;
288 }
289 return 0;
290}
291
292/**
293 * Setversion ioctl.
294 *
295 * \param inode device inode.
296 * \param file_priv DRM file private.
297 * \param cmd command.
298 * \param arg user argument, pointing to a drm_lock structure.
299 * \return zero on success or negative number on failure.
300 *
301 * Sets the requested interface version
302 */
303int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
304{
305 struct drm_set_version *sv = data;
306 int if_version, retcode = 0;
307
308 if (sv->drm_di_major != -1) {
309 if (sv->drm_di_major != DRM_IF_MAJOR ||
310 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
311 retcode = -EINVAL;
312 goto done;
313 }
314 if_version = DRM_IF_VERSION(sv->drm_di_major,
315 sv->drm_di_minor);
316 dev->if_version = max(if_version, dev->if_version);
317 if (sv->drm_di_minor >= 1) {
318 /*
319 * Version 1.1 includes tying of DRM to specific device
320 * Version 1.4 has proper PCI domain support
321 */
322 retcode = drm_set_busid(dev, file_priv);
323 if (retcode)
324 goto done;
325 }
326 }
327
328 if (sv->drm_dd_major != -1) {
329 if (sv->drm_dd_major != dev->driver->major ||
330 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
331 dev->driver->minor) {
332 retcode = -EINVAL;
333 goto done;
334 }
335
336 if (dev->driver->set_version)
337 dev->driver->set_version(dev, sv);
338 }
339
340done:
341 sv->drm_di_major = DRM_IF_MAJOR;
342 sv->drm_di_minor = DRM_IF_MINOR;
343 sv->drm_dd_major = dev->driver->major;
344 sv->drm_dd_minor = dev->driver->minor;
345
346 return retcode;
347}
348
349/** No-op ioctl. */
350int drm_noop(struct drm_device *dev, void *data,
351 struct drm_file *file_priv)
352{
353 DRM_DEBUG("\n");
354 return 0;
355}
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_auth.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
40/**
41 * DOC: getunique and setversion story
42 *
43 * BEWARE THE DRAGONS! MIND THE TRAPDOORS!
44 *
45 * In an attempt to warn anyone else who's trying to figure out what's going
46 * on here, I'll try to summarize the story. First things first, let's clear up
47 * the names, because the kernel internals, libdrm and the ioctls are all named
48 * differently:
49 *
50 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
51 * through the drmGetBusid function.
52 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
53 * that code is nerved in the kernel with drm_invalid_op().
54 * - The internal set_busid kernel functions and driver callbacks are
55 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
56 * nerved) allowed userspace to set the busid through the above ioctl.
57 * - Other ioctls and functions involved are named consistently.
58 *
59 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
60 * handling pci domains in the busid on ppc. Doing this correctly was only
61 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
62 * special with drm 1.2 and 1.3.
63 *
64 * Now the actual horror story of how device lookup in drm works. At large,
65 * there's 2 different ways, either by busid, or by device driver name.
66 *
67 * Opening by busid is fairly simple:
68 *
69 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a
70 * side-effect this fills out the unique name in the master structure.
71 * 2. Call GET_UNIQUE to read out the unique name from the master structure,
72 * which matches the busid thanks to step 1. If it doesn't, proceed to try
73 * the next device node.
74 *
75 * Opening by name is slightly different:
76 *
77 * 1. Directly call VERSION to get the version and to match against the driver
78 * name returned by that ioctl. Note that SET_VERSION is not called, which
79 * means the the unique name for the master node just opening is _not_ filled
80 * out. This despite that with current drm device nodes are always bound to
81 * one device, and can't be runtime assigned like with drm 1.0.
82 * 2. Match driver name. If it mismatches, proceed to the next device node.
83 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
84 * checking that the first byte in the string is 0). If that's not the case
85 * libdrm skips and proceeds to the next device node. Probably this is just
86 * copypasta from drm 1.0 times where a set unique name meant that the driver
87 * was in use already, but that's just conjecture.
88 *
89 * Long story short: To keep the open by name logic working, GET_UNIQUE must
90 * _not_ return a unique string when SET_VERSION hasn't been called yet,
91 * otherwise libdrm breaks. Even when that unique string can't ever change, and
92 * is totally irrelevant for actually opening the device because runtime
93 * assignable device instances were only support in drm 1.0, which is long dead.
94 * But the libdrm code in drmOpenByName somehow survived, hence this can't be
95 * broken.
96 */
97
98static int drm_version(struct drm_device *dev, void *data,
99 struct drm_file *file_priv);
100
101/*
102 * Get the bus id.
103 *
104 * \param inode device inode.
105 * \param file_priv DRM file private.
106 * \param cmd command.
107 * \param arg user argument, pointing to a drm_unique structure.
108 * \return zero on success or a negative number on failure.
109 *
110 * Copies the bus id from drm_device::unique into user space.
111 */
112static int drm_getunique(struct drm_device *dev, void *data,
113 struct drm_file *file_priv)
114{
115 struct drm_unique *u = data;
116 struct drm_master *master = file_priv->master;
117
118 if (u->unique_len >= master->unique_len) {
119 if (copy_to_user(u->unique, master->unique, master->unique_len))
120 return -EFAULT;
121 }
122 u->unique_len = master->unique_len;
123
124 return 0;
125}
126
127static void
128drm_unset_busid(struct drm_device *dev,
129 struct drm_master *master)
130{
131 kfree(master->unique);
132 master->unique = NULL;
133 master->unique_len = 0;
134}
135
136static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
137{
138 struct drm_master *master = file_priv->master;
139 int ret;
140
141 if (master->unique != NULL)
142 drm_unset_busid(dev, master);
143
144 if (dev->driver->set_busid) {
145 ret = dev->driver->set_busid(dev, master);
146 if (ret) {
147 drm_unset_busid(dev, master);
148 return ret;
149 }
150 } else {
151 WARN_ON(!dev->unique);
152 master->unique = kstrdup(dev->unique, GFP_KERNEL);
153 if (master->unique)
154 master->unique_len = strlen(dev->unique);
155 }
156
157 return 0;
158}
159
160/*
161 * Get client information.
162 *
163 * \param inode device inode.
164 * \param file_priv DRM file private.
165 * \param cmd command.
166 * \param arg user argument, pointing to a drm_client structure.
167 *
168 * \return zero on success or a negative number on failure.
169 *
170 * Searches for the client with the specified index and copies its information
171 * into userspace
172 */
173static int drm_getclient(struct drm_device *dev, void *data,
174 struct drm_file *file_priv)
175{
176 struct drm_client *client = data;
177
178 /*
179 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
180 * not breaking completely. Userspace tools stop enumerating one they
181 * get -EINVAL, hence this is the return value we need to hand back for
182 * no clients tracked.
183 *
184 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
185 * attempt to figure out whether they're authenticated or not. Since
186 * that's the only thing they care about, give it to the directly
187 * instead of walking one giant list.
188 */
189 if (client->idx == 0) {
190 client->auth = file_priv->authenticated;
191 client->pid = task_pid_vnr(current);
192 client->uid = overflowuid;
193 client->magic = 0;
194 client->iocs = 0;
195
196 return 0;
197 } else {
198 return -EINVAL;
199 }
200}
201
202/*
203 * Get statistics information.
204 *
205 * \param inode device inode.
206 * \param file_priv DRM file private.
207 * \param cmd command.
208 * \param arg user argument, pointing to a drm_stats structure.
209 *
210 * \return zero on success or a negative number on failure.
211 */
212static int drm_getstats(struct drm_device *dev, void *data,
213 struct drm_file *file_priv)
214{
215 struct drm_stats *stats = data;
216
217 /* Clear stats to prevent userspace from eating its stack garbage. */
218 memset(stats, 0, sizeof(*stats));
219
220 return 0;
221}
222
223/*
224 * Get device/driver capabilities
225 */
226static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
227{
228 struct drm_get_cap *req = data;
229 struct drm_crtc *crtc;
230
231 req->value = 0;
232
233 /* Only some caps make sense with UMS/render-only drivers. */
234 switch (req->capability) {
235 case DRM_CAP_TIMESTAMP_MONOTONIC:
236 req->value = drm_timestamp_monotonic;
237 return 0;
238 case DRM_CAP_PRIME:
239 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
240 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
241 return 0;
242 }
243
244 /* Other caps only work with KMS drivers */
245 if (!drm_core_check_feature(dev, DRIVER_MODESET))
246 return -ENOTSUPP;
247
248 switch (req->capability) {
249 case DRM_CAP_DUMB_BUFFER:
250 if (dev->driver->dumb_create)
251 req->value = 1;
252 break;
253 case DRM_CAP_VBLANK_HIGH_CRTC:
254 req->value = 1;
255 break;
256 case DRM_CAP_DUMB_PREFERRED_DEPTH:
257 req->value = dev->mode_config.preferred_depth;
258 break;
259 case DRM_CAP_DUMB_PREFER_SHADOW:
260 req->value = dev->mode_config.prefer_shadow;
261 break;
262 case DRM_CAP_ASYNC_PAGE_FLIP:
263 req->value = dev->mode_config.async_page_flip;
264 break;
265 case DRM_CAP_PAGE_FLIP_TARGET:
266 req->value = 1;
267 drm_for_each_crtc(crtc, dev) {
268 if (!crtc->funcs->page_flip_target)
269 req->value = 0;
270 }
271 break;
272 case DRM_CAP_CURSOR_WIDTH:
273 if (dev->mode_config.cursor_width)
274 req->value = dev->mode_config.cursor_width;
275 else
276 req->value = 64;
277 break;
278 case DRM_CAP_CURSOR_HEIGHT:
279 if (dev->mode_config.cursor_height)
280 req->value = dev->mode_config.cursor_height;
281 else
282 req->value = 64;
283 break;
284 case DRM_CAP_ADDFB2_MODIFIERS:
285 req->value = dev->mode_config.allow_fb_modifiers;
286 break;
287 default:
288 return -EINVAL;
289 }
290 return 0;
291}
292
293/*
294 * Set device/driver capabilities
295 */
296static int
297drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
298{
299 struct drm_set_client_cap *req = data;
300
301 switch (req->capability) {
302 case DRM_CLIENT_CAP_STEREO_3D:
303 if (req->value > 1)
304 return -EINVAL;
305 file_priv->stereo_allowed = req->value;
306 break;
307 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
308 if (req->value > 1)
309 return -EINVAL;
310 file_priv->universal_planes = req->value;
311 break;
312 case DRM_CLIENT_CAP_ATOMIC:
313 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
314 return -EINVAL;
315 if (req->value > 1)
316 return -EINVAL;
317 file_priv->atomic = req->value;
318 file_priv->universal_planes = req->value;
319 break;
320 default:
321 return -EINVAL;
322 }
323
324 return 0;
325}
326
327/*
328 * Setversion ioctl.
329 *
330 * \param inode device inode.
331 * \param file_priv DRM file private.
332 * \param cmd command.
333 * \param arg user argument, pointing to a drm_lock structure.
334 * \return zero on success or negative number on failure.
335 *
336 * Sets the requested interface version
337 */
338static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
339{
340 struct drm_set_version *sv = data;
341 int if_version, retcode = 0;
342
343 if (sv->drm_di_major != -1) {
344 if (sv->drm_di_major != DRM_IF_MAJOR ||
345 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
346 retcode = -EINVAL;
347 goto done;
348 }
349 if_version = DRM_IF_VERSION(sv->drm_di_major,
350 sv->drm_di_minor);
351 dev->if_version = max(if_version, dev->if_version);
352 if (sv->drm_di_minor >= 1) {
353 /*
354 * Version 1.1 includes tying of DRM to specific device
355 * Version 1.4 has proper PCI domain support
356 */
357 retcode = drm_set_busid(dev, file_priv);
358 if (retcode)
359 goto done;
360 }
361 }
362
363 if (sv->drm_dd_major != -1) {
364 if (sv->drm_dd_major != dev->driver->major ||
365 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
366 dev->driver->minor) {
367 retcode = -EINVAL;
368 goto done;
369 }
370 }
371
372done:
373 sv->drm_di_major = DRM_IF_MAJOR;
374 sv->drm_di_minor = DRM_IF_MINOR;
375 sv->drm_dd_major = dev->driver->major;
376 sv->drm_dd_minor = dev->driver->minor;
377
378 return retcode;
379}
380
381/**
382 * drm_noop - DRM no-op ioctl implemntation
383 * @dev: DRM device for the ioctl
384 * @data: data pointer for the ioctl
385 * @file_priv: DRM file for the ioctl call
386 *
387 * This no-op implementation for drm ioctls is useful for deprecated
388 * functionality where we can't return a failure code because existing userspace
389 * checks the result of the ioctl, but doesn't care about the action.
390 *
391 * Always returns successfully with 0.
392 */
393int drm_noop(struct drm_device *dev, void *data,
394 struct drm_file *file_priv)
395{
396 DRM_DEBUG("\n");
397 return 0;
398}
399EXPORT_SYMBOL(drm_noop);
400
401/**
402 * drm_invalid_op - DRM invalid ioctl implemntation
403 * @dev: DRM device for the ioctl
404 * @data: data pointer for the ioctl
405 * @file_priv: DRM file for the ioctl call
406 *
407 * This no-op implementation for drm ioctls is useful for deprecated
408 * functionality where we really don't want to allow userspace to call the ioctl
409 * any more. This is the case for old ums interfaces for drivers that
410 * transitioned to kms gradually and so kept the old legacy tables around. This
411 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
412 * use this function.
413 *
414 * Always fails with a return value of -EINVAL.
415 */
416int drm_invalid_op(struct drm_device *dev, void *data,
417 struct drm_file *file_priv)
418{
419 return -EINVAL;
420}
421EXPORT_SYMBOL(drm_invalid_op);
422
423/*
424 * Copy and IOCTL return string to user space
425 */
426static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
427{
428 int len;
429
430 /* don't overflow userbuf */
431 len = strlen(value);
432 if (len > *buf_len)
433 len = *buf_len;
434
435 /* let userspace know exact length of driver value (which could be
436 * larger than the userspace-supplied buffer) */
437 *buf_len = strlen(value);
438
439 /* finally, try filling in the userbuf */
440 if (len && buf)
441 if (copy_to_user(buf, value, len))
442 return -EFAULT;
443 return 0;
444}
445
446/*
447 * Get version information
448 *
449 * \param inode device inode.
450 * \param filp file pointer.
451 * \param cmd command.
452 * \param arg user argument, pointing to a drm_version structure.
453 * \return zero on success or negative number on failure.
454 *
455 * Fills in the version information in \p arg.
456 */
457static int drm_version(struct drm_device *dev, void *data,
458 struct drm_file *file_priv)
459{
460 struct drm_version *version = data;
461 int err;
462
463 version->version_major = dev->driver->major;
464 version->version_minor = dev->driver->minor;
465 version->version_patchlevel = dev->driver->patchlevel;
466 err = drm_copy_field(version->name, &version->name_len,
467 dev->driver->name);
468 if (!err)
469 err = drm_copy_field(version->date, &version->date_len,
470 dev->driver->date);
471 if (!err)
472 err = drm_copy_field(version->desc, &version->desc_len,
473 dev->driver->desc);
474
475 return err;
476}
477
478/*
479 * drm_ioctl_permit - Check ioctl permissions against caller
480 *
481 * @flags: ioctl permission flags.
482 * @file_priv: Pointer to struct drm_file identifying the caller.
483 *
484 * Checks whether the caller is allowed to run an ioctl with the
485 * indicated permissions. If so, returns zero. Otherwise returns an
486 * error code suitable for ioctl return.
487 */
488int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
489{
490 /* ROOT_ONLY is only for CAP_SYS_ADMIN */
491 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
492 return -EACCES;
493
494 /* AUTH is only for authenticated or render client */
495 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
496 !file_priv->authenticated))
497 return -EACCES;
498
499 /* MASTER is only for master or control clients */
500 if (unlikely((flags & DRM_MASTER) &&
501 !drm_is_current_master(file_priv) &&
502 !drm_is_control_client(file_priv)))
503 return -EACCES;
504
505 /* Control clients must be explicitly allowed */
506 if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
507 drm_is_control_client(file_priv)))
508 return -EACCES;
509
510 /* Render clients must be explicitly allowed */
511 if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
512 drm_is_render_client(file_priv)))
513 return -EACCES;
514
515 return 0;
516}
517EXPORT_SYMBOL(drm_ioctl_permit);
518
519#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
520 [DRM_IOCTL_NR(ioctl)] = { \
521 .cmd = ioctl, \
522 .func = _func, \
523 .flags = _flags, \
524 .name = #ioctl \
525 }
526
527/* Ioctl table */
528static const struct drm_ioctl_desc drm_ioctls[] = {
529 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
530 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
531 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
532 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED),
533 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
534 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED),
535 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
536 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
537 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
538 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
539 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
540
541 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
542 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
543 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
544 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER),
545
546 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
547 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
548
549 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
550 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
551
552 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY),
553 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY),
554
555 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
556 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
557 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
558 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
559 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
560 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
561 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
562
563 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
564 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
565
566 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
567 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
568
569 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
570
571 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
572 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
573 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
574 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
575 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
576 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
577
578 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
579
580#if IS_ENABLED(CONFIG_AGP)
581 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
582 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
583 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
584 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
585 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
586 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
587 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
588 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
589#endif
590
591 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
592 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
593
594 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
595
596 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
597
598 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
599
600 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
601 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
602 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
603
604 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
605
606 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
607 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
608
609 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
610 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
611 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
612 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
613 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
614 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
624 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
625 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
626 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
627 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
628 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
629 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
630 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
631 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
632 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
633 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
634 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
635 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
636 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
637 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
638 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
639};
640
641#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
642
643/**
644 * drm_ioctl - ioctl callback implementation for DRM drivers
645 * @filp: file this ioctl is called on
646 * @cmd: ioctl cmd number
647 * @arg: user argument
648 *
649 * Looks up the ioctl function in the ::ioctls table, checking for root
650 * previleges if so required, and dispatches to the respective function.
651 *
652 * Returns:
653 * Zero on success, negative error code on failure.
654 */
655long drm_ioctl(struct file *filp,
656 unsigned int cmd, unsigned long arg)
657{
658 struct drm_file *file_priv = filp->private_data;
659 struct drm_device *dev;
660 const struct drm_ioctl_desc *ioctl = NULL;
661 drm_ioctl_t *func;
662 unsigned int nr = DRM_IOCTL_NR(cmd);
663 int retcode = -EINVAL;
664 char stack_kdata[128];
665 char *kdata = NULL;
666 unsigned int in_size, out_size, drv_size, ksize;
667 bool is_driver_ioctl;
668
669 dev = file_priv->minor->dev;
670
671 if (drm_device_is_unplugged(dev))
672 return -ENODEV;
673
674 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
675
676 if (is_driver_ioctl) {
677 /* driver ioctl */
678 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
679 goto err_i1;
680 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
681 } else {
682 /* core ioctl */
683 if (nr >= DRM_CORE_IOCTL_COUNT)
684 goto err_i1;
685 ioctl = &drm_ioctls[nr];
686 }
687
688 drv_size = _IOC_SIZE(ioctl->cmd);
689 out_size = in_size = _IOC_SIZE(cmd);
690 if ((cmd & ioctl->cmd & IOC_IN) == 0)
691 in_size = 0;
692 if ((cmd & ioctl->cmd & IOC_OUT) == 0)
693 out_size = 0;
694 ksize = max(max(in_size, out_size), drv_size);
695
696 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
697 task_pid_nr(current),
698 (long)old_encode_dev(file_priv->minor->kdev->devt),
699 file_priv->authenticated, ioctl->name);
700
701 /* Do not trust userspace, use our own definition */
702 func = ioctl->func;
703
704 if (unlikely(!func)) {
705 DRM_DEBUG("no function\n");
706 retcode = -EINVAL;
707 goto err_i1;
708 }
709
710 retcode = drm_ioctl_permit(ioctl->flags, file_priv);
711 if (unlikely(retcode))
712 goto err_i1;
713
714 if (ksize <= sizeof(stack_kdata)) {
715 kdata = stack_kdata;
716 } else {
717 kdata = kmalloc(ksize, GFP_KERNEL);
718 if (!kdata) {
719 retcode = -ENOMEM;
720 goto err_i1;
721 }
722 }
723
724 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
725 retcode = -EFAULT;
726 goto err_i1;
727 }
728
729 if (ksize > in_size)
730 memset(kdata + in_size, 0, ksize - in_size);
731
732 /* Enforce sane locking for modern driver ioctls. Core ioctls are
733 * too messy still. */
734 if ((!drm_core_check_feature(dev, DRIVER_LEGACY) && is_driver_ioctl) ||
735 (ioctl->flags & DRM_UNLOCKED))
736 retcode = func(dev, kdata, file_priv);
737 else {
738 mutex_lock(&drm_global_mutex);
739 retcode = func(dev, kdata, file_priv);
740 mutex_unlock(&drm_global_mutex);
741 }
742
743 if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
744 retcode = -EFAULT;
745
746 err_i1:
747 if (!ioctl)
748 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
749 task_pid_nr(current),
750 (long)old_encode_dev(file_priv->minor->kdev->devt),
751 file_priv->authenticated, cmd, nr);
752
753 if (kdata != stack_kdata)
754 kfree(kdata);
755 if (retcode)
756 DRM_DEBUG("ret = %d\n", retcode);
757 return retcode;
758}
759EXPORT_SYMBOL(drm_ioctl);
760
761/**
762 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
763 * @nr: ioctl number
764 * @flags: where to return the ioctl permission flags
765 *
766 * This ioctl is only used by the vmwgfx driver to augment the access checks
767 * done by the drm core and insofar a pretty decent layering violation. This
768 * shouldn't be used by any drivers.
769 *
770 * Returns:
771 * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
772 */
773bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
774{
775 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
776 return false;
777
778 if (nr >= DRM_CORE_IOCTL_COUNT)
779 return false;
780
781 *flags = drm_ioctls[nr].flags;
782 return true;
783}
784EXPORT_SYMBOL(drm_ioctl_flags);