blob: a6d773a61c2d2527dd6a8262435f4e8e6b3339cb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
David Herrmannec8f1122014-07-23 14:14:53 +02008 * Author Rickard E. (Rik) Faith <faith@valinux.com>
9 * Author Gareth Hughes <gareth@valinux.com>
10 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * 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
David Howells760285e2012-10-02 18:01:07 +010031#include <drm/drmP.h>
32#include <drm/drm_core.h>
David Herrmanne7b960702014-07-24 12:10:04 +020033#include "drm_legacy.h"
Daniel Vetter18882992014-09-10 08:16:10 +020034#include "drm_internal.h"
Daniel Vettera97df1c2014-12-18 22:49:02 +010035#include "drm_crtc_internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
David Howells760285e2012-10-02 18:01:07 +010037#include <linux/pci.h>
38#include <linux/export.h>
Andy Lutomirski0dd99f12013-05-13 23:58:48 +000039#ifdef CONFIG_X86
40#include <asm/mtrr.h>
41#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
David Herrmannec8f1122014-07-23 14:14:53 +020043static int drm_version(struct drm_device *dev, void *data,
44 struct drm_file *file_priv);
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046/**
47 * Get the bus id.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100048 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +100050 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 * \param cmd command.
52 * \param arg user argument, pointing to a drm_unique structure.
53 * \return zero on success or a negative number on failure.
54 *
55 * Copies the bus id from drm_device::unique into user space.
56 */
Daniel Vetter78238752014-09-10 12:43:55 +020057static int drm_getunique(struct drm_device *dev, void *data,
Eric Anholtc153f452007-09-03 12:06:45 +100058 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Eric Anholtc153f452007-09-03 12:06:45 +100060 struct drm_unique *u = data;
Dave Airlie7c1c2872008-11-28 14:22:24 +100061 struct drm_master *master = file_priv->master;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Dave Airlie7c1c2872008-11-28 14:22:24 +100063 if (u->unique_len >= master->unique_len) {
64 if (copy_to_user(u->unique, master->unique, master->unique_len))
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 return -EFAULT;
66 }
Dave Airlie7c1c2872008-11-28 14:22:24 +100067 u->unique_len = master->unique_len;
Eric Anholtc153f452007-09-03 12:06:45 +100068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return 0;
70}
71
Chris Wilson3fb688f2010-08-04 11:09:42 +010072static void
73drm_unset_busid(struct drm_device *dev,
74 struct drm_master *master)
75{
Chris Wilson3fb688f2010-08-04 11:09:42 +010076 kfree(master->unique);
77 master->unique = NULL;
78 master->unique_len = 0;
Chris Wilson3fb688f2010-08-04 11:09:42 +010079}
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/**
82 * Set the bus id.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100083 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +100085 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 * \param cmd command.
87 * \param arg user argument, pointing to a drm_unique structure.
88 * \return zero on success or a negative number on failure.
89 *
90 * Copies the bus id from userspace into drm_device::unique, and verifies that
91 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
92 * in interface version 1.1 and will return EBUSY when setversion has requested
Daniel Vetter53bf2a22013-11-03 21:47:18 +010093 * version 1.1 or greater. Also note that KMS is all version 1.1 and later and
94 * UMS was only ever supported on pci devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 */
Daniel Vetter78238752014-09-10 12:43:55 +020096static int drm_setunique(struct drm_device *dev, void *data,
Eric Anholtc153f452007-09-03 12:06:45 +100097 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Eric Anholtc153f452007-09-03 12:06:45 +100099 struct drm_unique *u = data;
Dave Airlie7c1c2872008-11-28 14:22:24 +1000100 struct drm_master *master = file_priv->master;
Dave Airlie8410ea32010-12-15 03:16:38 +1000101 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Dave Airlie7c1c2872008-11-28 14:22:24 +1000103 if (master->unique_len || master->unique)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000104 return -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Eric Anholtc153f452007-09-03 12:06:45 +1000106 if (!u->unique_len || u->unique_len > 1024)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000107 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Daniel Vetter53bf2a22013-11-03 21:47:18 +0100109 if (drm_core_check_feature(dev, DRIVER_MODESET))
110 return 0;
111
112 if (WARN_ON(!dev->pdev))
Dave Airlie8410ea32010-12-15 03:16:38 +1000113 return -EINVAL;
114
Daniel Vetter53bf2a22013-11-03 21:47:18 +0100115 ret = drm_pci_set_unique(dev, master, u);
Dave Airlie8410ea32010-12-15 03:16:38 +1000116 if (ret)
Chris Wilson3fb688f2010-08-04 11:09:42 +0100117 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
119 return 0;
Chris Wilson3fb688f2010-08-04 11:09:42 +0100120
121err:
122 drm_unset_busid(dev, master);
123 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124}
125
Dave Airlie7c1c2872008-11-28 14:22:24 +1000126static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
Dave Airlie7c1c2872008-11-28 14:22:24 +1000128 struct drm_master *master = file_priv->master;
Dave Airlie8410ea32010-12-15 03:16:38 +1000129 int ret;
Chris Wilson3fb688f2010-08-04 11:09:42 +0100130
131 if (master->unique != NULL)
132 drm_unset_busid(dev, master);
Dave Airliefe347652006-01-02 21:19:39 +1100133
David Herrmann915b4d12014-08-29 12:12:43 +0200134 if (dev->driver->set_busid) {
135 ret = dev->driver->set_busid(dev, master);
136 if (ret) {
137 drm_unset_busid(dev, master);
138 return ret;
139 }
Thierry Redingca8e2ad2014-04-11 15:23:00 +0200140 } else {
141 if (WARN(dev->unique == NULL,
David Herrmannc5786fe2014-08-29 12:12:44 +0200142 "No drm_driver.set_busid() implementation provided by "
Thierry Redingca8e2ad2014-04-11 15:23:00 +0200143 "%ps. Use drm_dev_set_unique() to set the unique "
144 "name explicitly.", dev->driver))
145 return -EINVAL;
146
147 master->unique = kstrdup(dev->unique, GFP_KERNEL);
148 if (master->unique)
149 master->unique_len = strlen(dev->unique);
150 }
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 return 0;
153}
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155/**
156 * Get a mapping information.
157 *
158 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000159 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 * \param cmd command.
161 * \param arg user argument, pointing to a drm_map structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000162 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 * \return zero on success or a negative number on failure.
164 *
165 * Searches for the mapping with the specified offset and copies its information
166 * into userspace
167 */
Daniel Vetter78238752014-09-10 12:43:55 +0200168static int drm_getmap(struct drm_device *dev, void *data,
Eric Anholtc153f452007-09-03 12:06:45 +1000169 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
Eric Anholtc153f452007-09-03 12:06:45 +1000171 struct drm_map *map = data;
Dave Airlie55910512007-07-11 16:53:40 +1000172 struct drm_map_list *r_list = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 struct list_head *list;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000174 int idx;
175 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Eric Anholtc153f452007-09-03 12:06:45 +1000177 idx = map->offset;
Ilija Hadzic09b4ea42011-10-28 17:43:28 -0400178 if (idx < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181 i = 0;
Ilija Hadzic09b4ea42011-10-28 17:43:28 -0400182 mutex_lock(&dev->struct_mutex);
Dave Airliebd1b3312007-05-26 05:01:51 +1000183 list_for_each(list, &dev->maplist) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000184 if (i == idx) {
Dave Airlie55910512007-07-11 16:53:40 +1000185 r_list = list_entry(list, struct drm_map_list, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 break;
187 }
188 i++;
189 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000190 if (!r_list || !r_list->map) {
Dave Airlie30e2fb12006-02-02 19:37:46 +1100191 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return -EINVAL;
193 }
194
Eric Anholtc153f452007-09-03 12:06:45 +1000195 map->offset = r_list->map->offset;
196 map->size = r_list->map->size;
197 map->type = r_list->map->type;
198 map->flags = r_list->map->flags;
199 map->handle = (void *)(unsigned long) r_list->user_token;
Andy Lutomirski0dd99f12013-05-13 23:58:48 +0000200
201#ifdef CONFIG_X86
202 /*
203 * There appears to be exactly one user of the mtrr index: dritest.
204 * It's easy enough to keep it working on non-PAT systems.
205 */
206 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
207#else
208 map->mtrr = -1;
209#endif
210
Dave Airlie30e2fb12006-02-02 19:37:46 +1100211 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 return 0;
214}
215
216/**
217 * Get client information.
218 *
219 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000220 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 * \param cmd command.
222 * \param arg user argument, pointing to a drm_client structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000223 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 * \return zero on success or a negative number on failure.
225 *
226 * Searches for the client with the specified index and copies its information
227 * into userspace
228 */
Daniel Vetter78238752014-09-10 12:43:55 +0200229static int drm_getclient(struct drm_device *dev, void *data,
Eric Anholtc153f452007-09-03 12:06:45 +1000230 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
Eric Anholtc153f452007-09-03 12:06:45 +1000232 struct drm_client *client = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
Daniel Vetter719524d2013-08-08 15:41:31 +0200234 /*
235 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
236 * not breaking completely. Userspace tools stop enumerating one they
237 * get -EINVAL, hence this is the return value we need to hand back for
238 * no clients tracked.
239 *
240 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
241 * attempt to figure out whether they're authenticated or not. Since
242 * that's the only thing they care about, give it to the directly
243 * instead of walking one giant list.
244 */
245 if (client->idx == 0) {
246 client->auth = file_priv->authenticated;
247 client->pid = pid_vnr(file_priv->pid);
248 client->uid = from_kuid_munged(current_user_ns(),
249 file_priv->uid);
250 client->magic = 0;
251 client->iocs = 0;
Ilija Hadzic09b4ea42011-10-28 17:43:28 -0400252
Daniel Vetter719524d2013-08-08 15:41:31 +0200253 return 0;
254 } else {
255 return -EINVAL;
Eric Anholtb018fcd2007-11-22 18:46:54 +1000256 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257}
258
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000259/**
260 * Get statistics information.
261 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000263 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 * \param cmd command.
265 * \param arg user argument, pointing to a drm_stats structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000266 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 * \return zero on success or a negative number on failure.
268 */
Daniel Vetter78238752014-09-10 12:43:55 +0200269static int drm_getstats(struct drm_device *dev, void *data,
Eric Anholtc153f452007-09-03 12:06:45 +1000270 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
Eric Anholtc153f452007-09-03 12:06:45 +1000272 struct drm_stats *stats = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Daniel Vetterd79cdc82013-08-08 15:41:32 +0200274 /* Clear stats to prevent userspace from eating its stack garbage. */
Li Zefan246a3d12007-11-05 12:53:09 +1000275 memset(stats, 0, sizeof(*stats));
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return 0;
278}
279
280/**
Ben Skeggs9f354212011-02-21 11:17:35 +1000281 * Get device/driver capabilities
282 */
Daniel Vetter78238752014-09-10 12:43:55 +0200283static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
Ben Skeggs9f354212011-02-21 11:17:35 +1000284{
285 struct drm_get_cap *req = data;
286
287 req->value = 0;
Dave Airliee73f88a2011-03-04 14:50:28 +1000288 switch (req->capability) {
289 case DRM_CAP_DUMB_BUFFER:
290 if (dev->driver->dumb_create)
291 req->value = 1;
292 break;
Dave Airlie51eab412011-03-24 20:54:35 +1000293 case DRM_CAP_VBLANK_HIGH_CRTC:
Ilija Hadzic19b01b52011-03-18 16:58:04 -0500294 req->value = 1;
295 break;
Dave Airlie019d96c2011-09-29 16:20:42 +0100296 case DRM_CAP_DUMB_PREFERRED_DEPTH:
297 req->value = dev->mode_config.preferred_depth;
298 break;
299 case DRM_CAP_DUMB_PREFER_SHADOW:
300 req->value = dev->mode_config.prefer_shadow;
301 break;
Dave Airlie4271a402012-04-02 14:11:50 +0100302 case DRM_CAP_PRIME:
303 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
304 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
305 break;
Imre Deakc61eef72012-10-23 18:53:26 +0000306 case DRM_CAP_TIMESTAMP_MONOTONIC:
307 req->value = drm_timestamp_monotonic;
308 break;
Keith Packard62f21042013-07-22 18:50:00 -0700309 case DRM_CAP_ASYNC_PAGE_FLIP:
310 req->value = dev->mode_config.async_page_flip;
311 break;
Alex Deucher8716ed42014-02-12 12:48:23 -0500312 case DRM_CAP_CURSOR_WIDTH:
313 if (dev->mode_config.cursor_width)
314 req->value = dev->mode_config.cursor_width;
315 else
316 req->value = 64;
317 break;
318 case DRM_CAP_CURSOR_HEIGHT:
319 if (dev->mode_config.cursor_height)
320 req->value = dev->mode_config.cursor_height;
321 else
322 req->value = 64;
323 break;
Rob Clarke3eb3252015-02-05 14:41:52 +0000324 case DRM_CAP_ADDFB2_MODIFIERS:
325 req->value = dev->mode_config.allow_fb_modifiers;
326 break;
Dave Airliee73f88a2011-03-04 14:50:28 +1000327 default:
328 return -EINVAL;
329 }
Ben Skeggs9f354212011-02-21 11:17:35 +1000330 return 0;
331}
332
333/**
Damien Lespiau1c0814f2013-09-25 16:45:20 +0100334 * Set device/driver capabilities
335 */
Daniel Vetter78238752014-09-10 12:43:55 +0200336static int
Damien Lespiau1c0814f2013-09-25 16:45:20 +0100337drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
338{
Damien Lespiau61d8e322013-09-25 16:45:22 +0100339 struct drm_set_client_cap *req = data;
340
341 switch (req->capability) {
342 case DRM_CLIENT_CAP_STEREO_3D:
343 if (req->value > 1)
344 return -EINVAL;
345 file_priv->stereo_allowed = req->value;
346 break;
Matt Roper681e7ec2014-04-01 15:22:42 -0700347 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
Matt Roper681e7ec2014-04-01 15:22:42 -0700348 if (req->value > 1)
349 return -EINVAL;
350 file_priv->universal_planes = req->value;
351 break;
Rob Clark88a48e22014-12-18 16:01:50 -0500352 case DRM_CLIENT_CAP_ATOMIC:
353 /* for now, hide behind experimental drm.atomic moduleparam */
354 if (!drm_atomic)
355 return -EINVAL;
356 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
357 return -EINVAL;
358 if (req->value > 1)
359 return -EINVAL;
360 file_priv->atomic = req->value;
Daniel Vetter179f1582014-12-19 10:33:52 +0100361 file_priv->universal_planes = req->value;
Rob Clark88a48e22014-12-18 16:01:50 -0500362 break;
Damien Lespiau61d8e322013-09-25 16:45:22 +0100363 default:
364 return -EINVAL;
365 }
366
367 return 0;
Damien Lespiau1c0814f2013-09-25 16:45:20 +0100368}
369
370/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 * Setversion ioctl.
372 *
373 * \param inode device inode.
Eric Anholt6c340ea2007-08-25 20:23:09 +1000374 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 * \param cmd command.
376 * \param arg user argument, pointing to a drm_lock structure.
377 * \return zero on success or negative number on failure.
378 *
379 * Sets the requested interface version
380 */
Daniel Vetter78238752014-09-10 12:43:55 +0200381static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
Eric Anholtc153f452007-09-03 12:06:45 +1000383 struct drm_set_version *sv = data;
384 int if_version, retcode = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
Eric Anholtc153f452007-09-03 12:06:45 +1000386 if (sv->drm_di_major != -1) {
387 if (sv->drm_di_major != DRM_IF_MAJOR ||
388 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
389 retcode = -EINVAL;
390 goto done;
391 }
392 if_version = DRM_IF_VERSION(sv->drm_di_major,
393 sv->drm_di_minor);
Dave Airlie3d774612006-08-07 20:07:43 +1000394 dev->if_version = max(if_version, dev->if_version);
Eric Anholtc153f452007-09-03 12:06:45 +1000395 if (sv->drm_di_minor >= 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 /*
397 * Version 1.1 includes tying of DRM to specific device
Benjamin Herrenschmidtc17c2f82010-08-06 13:55:10 +1000398 * Version 1.4 has proper PCI domain support
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 */
Chris Wilson3fb688f2010-08-04 11:09:42 +0100400 retcode = drm_set_busid(dev, file_priv);
401 if (retcode)
402 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 }
404 }
405
Eric Anholtc153f452007-09-03 12:06:45 +1000406 if (sv->drm_dd_major != -1) {
407 if (sv->drm_dd_major != dev->driver->major ||
408 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
409 dev->driver->minor) {
410 retcode = -EINVAL;
411 goto done;
412 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
Eric Anholtc153f452007-09-03 12:06:45 +1000414
415done:
416 sv->drm_di_major = DRM_IF_MAJOR;
417 sv->drm_di_minor = DRM_IF_MINOR;
418 sv->drm_dd_major = dev->driver->major;
419 sv->drm_dd_minor = dev->driver->minor;
420
421 return retcode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423
424/** No-op ioctl. */
Eric Anholtc153f452007-09-03 12:06:45 +1000425int drm_noop(struct drm_device *dev, void *data,
426 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427{
428 DRM_DEBUG("\n");
429 return 0;
430}
Daniel Vetterb2c606f2012-01-17 12:50:12 +0100431EXPORT_SYMBOL(drm_noop);
David Herrmannec8f1122014-07-23 14:14:53 +0200432
433/**
434 * Copy and IOCTL return string to user space
435 */
436static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
437{
438 int len;
439
440 /* don't overflow userbuf */
441 len = strlen(value);
442 if (len > *buf_len)
443 len = *buf_len;
444
445 /* let userspace know exact length of driver value (which could be
446 * larger than the userspace-supplied buffer) */
447 *buf_len = strlen(value);
448
449 /* finally, try filling in the userbuf */
450 if (len && buf)
451 if (copy_to_user(buf, value, len))
452 return -EFAULT;
453 return 0;
454}
455
456/**
457 * Get version information
458 *
459 * \param inode device inode.
460 * \param filp file pointer.
461 * \param cmd command.
462 * \param arg user argument, pointing to a drm_version structure.
463 * \return zero on success or negative number on failure.
464 *
465 * Fills in the version information in \p arg.
466 */
467static int drm_version(struct drm_device *dev, void *data,
468 struct drm_file *file_priv)
469{
470 struct drm_version *version = data;
471 int err;
472
473 version->version_major = dev->driver->major;
474 version->version_minor = dev->driver->minor;
475 version->version_patchlevel = dev->driver->patchlevel;
476 err = drm_copy_field(version->name, &version->name_len,
477 dev->driver->name);
478 if (!err)
479 err = drm_copy_field(version->date, &version->date_len,
480 dev->driver->date);
481 if (!err)
482 err = drm_copy_field(version->desc, &version->desc_len,
483 dev->driver->desc);
484
485 return err;
486}
487
488/**
489 * drm_ioctl_permit - Check ioctl permissions against caller
490 *
491 * @flags: ioctl permission flags.
492 * @file_priv: Pointer to struct drm_file identifying the caller.
493 *
494 * Checks whether the caller is allowed to run an ioctl with the
495 * indicated permissions. If so, returns zero. Otherwise returns an
496 * error code suitable for ioctl return.
497 */
498static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
499{
500 /* ROOT_ONLY is only for CAP_SYS_ADMIN */
501 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
502 return -EACCES;
503
504 /* AUTH is only for authenticated or render client */
505 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
506 !file_priv->authenticated))
507 return -EACCES;
508
509 /* MASTER is only for master or control clients */
Dave Airlie7963e9d2014-08-08 07:30:53 +1000510 if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
David Herrmannec8f1122014-07-23 14:14:53 +0200511 !drm_is_control_client(file_priv)))
512 return -EACCES;
513
514 /* Control clients must be explicitly allowed */
515 if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
516 drm_is_control_client(file_priv)))
517 return -EACCES;
518
519 /* Render clients must be explicitly allowed */
520 if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
521 drm_is_render_client(file_priv)))
522 return -EACCES;
523
524 return 0;
525}
526
Daniel Vetter78238752014-09-10 12:43:55 +0200527#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
528 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
529
530/** Ioctl table */
531static const struct drm_ioctl_desc drm_ioctls[] = {
532 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW),
533 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
534 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
535 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
536 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
537 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
538 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
539 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
540 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
541 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
542
543 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
544 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
545 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
546 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
547
548 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
549 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
550
551 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
552 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
553
554 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
555 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
556
557 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
558 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
559 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
560 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
561 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
562 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
563 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
564
565 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
566 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
567
568 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
569 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
570
571 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
572
573 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
574 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
575 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
576 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
577 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
578 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
579
580 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
581
582#if __OS_HAS_AGP
583 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
584 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
585 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
586 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
587 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
588 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
589 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
590 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
591#endif
592
593 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
594 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
595
596 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
597
598 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
599
600 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
601
602 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
603 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
604 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
605
606 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
607
608 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
609 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
610
611 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
612 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
613 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
614 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
624 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
625 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
626 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
627 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
628 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
629 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
630 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
631 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
632 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
633 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
634 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
635 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
636 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
637 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
Rob Clarkd34f20d2014-12-18 16:01:56 -0500638 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
Daniel Vetter78238752014-09-10 12:43:55 +0200639};
640
641#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
642
David Herrmannec8f1122014-07-23 14:14:53 +0200643/**
644 * Called whenever a process performs an ioctl on /dev/drm.
645 *
646 * \param inode device inode.
647 * \param file_priv DRM file private.
648 * \param cmd command.
649 * \param arg user argument.
650 * \return zero on success or negative number on failure.
651 *
652 * Looks up the ioctl function in the ::ioctls table, checking for root
653 * previleges if so required, and dispatches to the respective function.
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 usize, asize;
667
668 dev = file_priv->minor->dev;
669
670 if (drm_device_is_unplugged(dev))
671 return -ENODEV;
672
673 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
674 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
675 goto err_i1;
676 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
677 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
678 u32 drv_size;
679 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
680 drv_size = _IOC_SIZE(ioctl->cmd_drv);
681 usize = asize = _IOC_SIZE(cmd);
682 if (drv_size > asize)
683 asize = drv_size;
684 cmd = ioctl->cmd_drv;
685 }
686 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
687 u32 drv_size;
688
689 ioctl = &drm_ioctls[nr];
690
691 drv_size = _IOC_SIZE(ioctl->cmd);
692 usize = asize = _IOC_SIZE(cmd);
693 if (drv_size > asize)
694 asize = drv_size;
695
696 cmd = ioctl->cmd;
697 } else
698 goto err_i1;
699
700 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
701 task_pid_nr(current),
702 (long)old_encode_dev(file_priv->minor->kdev->devt),
703 file_priv->authenticated, ioctl->name);
704
705 /* Do not trust userspace, use our own definition */
706 func = ioctl->func;
707
708 if (unlikely(!func)) {
709 DRM_DEBUG("no function\n");
710 retcode = -EINVAL;
711 goto err_i1;
712 }
713
714 retcode = drm_ioctl_permit(ioctl->flags, file_priv);
715 if (unlikely(retcode))
716 goto err_i1;
717
718 if (cmd & (IOC_IN | IOC_OUT)) {
719 if (asize <= sizeof(stack_kdata)) {
720 kdata = stack_kdata;
721 } else {
722 kdata = kmalloc(asize, GFP_KERNEL);
723 if (!kdata) {
724 retcode = -ENOMEM;
725 goto err_i1;
726 }
727 }
728 if (asize > usize)
729 memset(kdata + usize, 0, asize - usize);
730 }
731
732 if (cmd & IOC_IN) {
733 if (copy_from_user(kdata, (void __user *)arg,
734 usize) != 0) {
735 retcode = -EFAULT;
736 goto err_i1;
737 }
738 } else if (cmd & IOC_OUT) {
739 memset(kdata, 0, usize);
740 }
741
742 if (ioctl->flags & DRM_UNLOCKED)
743 retcode = func(dev, kdata, file_priv);
744 else {
745 mutex_lock(&drm_global_mutex);
746 retcode = func(dev, kdata, file_priv);
747 mutex_unlock(&drm_global_mutex);
748 }
749
750 if (cmd & IOC_OUT) {
751 if (copy_to_user((void __user *)arg, kdata,
752 usize) != 0)
753 retcode = -EFAULT;
754 }
755
756 err_i1:
757 if (!ioctl)
758 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
759 task_pid_nr(current),
760 (long)old_encode_dev(file_priv->minor->kdev->devt),
761 file_priv->authenticated, cmd, nr);
762
763 if (kdata != stack_kdata)
764 kfree(kdata);
765 if (retcode)
766 DRM_DEBUG("ret = %d\n", retcode);
767 return retcode;
768}
769EXPORT_SYMBOL(drm_ioctl);
770
771/**
772 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
773 *
774 * @nr: Ioctl number.
775 * @flags: Where to return the ioctl permission flags
776 */
777bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
778{
779 if ((nr >= DRM_COMMAND_END && nr < DRM_CORE_IOCTL_COUNT) ||
780 (nr < DRM_COMMAND_BASE)) {
781 *flags = drm_ioctls[nr].flags;
782 return true;
783 }
784
785 return false;
786}
787EXPORT_SYMBOL(drm_ioctl_flags);