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1da177e4 LT |
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 | * | |
ec8f112d DH |
8 | * Author Rickard E. (Rik) Faith <faith@valinux.com> |
9 | * Author Gareth Hughes <gareth@valinux.com> | |
10 | * | |
1da177e4 LT |
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 | ||
7cfdf711 | 31 | #include <drm/drm_ioctl.h> |
760285e7 | 32 | #include <drm/drmP.h> |
3b96a0b1 | 33 | #include <drm/drm_auth.h> |
e7b96070 | 34 | #include "drm_legacy.h" |
18882995 | 35 | #include "drm_internal.h" |
a97df1cc | 36 | #include "drm_crtc_internal.h" |
1da177e4 | 37 | |
760285e7 DH |
38 | #include <linux/pci.h> |
39 | #include <linux/export.h> | |
1da177e4 | 40 | |
a3257256 DV |
41 | /** |
42 | * DOC: getunique and setversion story | |
43 | * | |
44 | * BEWARE THE DRAGONS! MIND THE TRAPDOORS! | |
45 | * | |
46 | * In an attempt to warn anyone else who's trying to figure out what's going | |
47 | * on here, I'll try to summarize the story. First things first, let's clear up | |
48 | * the names, because the kernel internals, libdrm and the ioctls are all named | |
49 | * differently: | |
50 | * | |
51 | * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm | |
52 | * through the drmGetBusid function. | |
53 | * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All | |
54 | * that code is nerved in the kernel with drm_invalid_op(). | |
55 | * - The internal set_busid kernel functions and driver callbacks are | |
56 | * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is | |
57 | * nerved) allowed userspace to set the busid through the above ioctl. | |
58 | * - Other ioctls and functions involved are named consistently. | |
59 | * | |
60 | * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly | |
61 | * handling pci domains in the busid on ppc. Doing this correctly was only | |
62 | * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's | |
63 | * special with drm 1.2 and 1.3. | |
64 | * | |
65 | * Now the actual horror story of how device lookup in drm works. At large, | |
66 | * there's 2 different ways, either by busid, or by device driver name. | |
67 | * | |
68 | * Opening by busid is fairly simple: | |
69 | * | |
70 | * 1. First call SET_VERSION to make sure pci domains are handled properly. As a | |
71 | * side-effect this fills out the unique name in the master structure. | |
72 | * 2. Call GET_UNIQUE to read out the unique name from the master structure, | |
73 | * which matches the busid thanks to step 1. If it doesn't, proceed to try | |
74 | * the next device node. | |
75 | * | |
76 | * Opening by name is slightly different: | |
77 | * | |
78 | * 1. Directly call VERSION to get the version and to match against the driver | |
79 | * name returned by that ioctl. Note that SET_VERSION is not called, which | |
80 | * means the the unique name for the master node just opening is _not_ filled | |
81 | * out. This despite that with current drm device nodes are always bound to | |
82 | * one device, and can't be runtime assigned like with drm 1.0. | |
83 | * 2. Match driver name. If it mismatches, proceed to the next device node. | |
84 | * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by | |
85 | * checking that the first byte in the string is 0). If that's not the case | |
86 | * libdrm skips and proceeds to the next device node. Probably this is just | |
87 | * copypasta from drm 1.0 times where a set unique name meant that the driver | |
88 | * was in use already, but that's just conjecture. | |
89 | * | |
90 | * Long story short: To keep the open by name logic working, GET_UNIQUE must | |
91 | * _not_ return a unique string when SET_VERSION hasn't been called yet, | |
92 | * otherwise libdrm breaks. Even when that unique string can't ever change, and | |
93 | * is totally irrelevant for actually opening the device because runtime | |
94 | * assignable device instances were only support in drm 1.0, which is long dead. | |
95 | * But the libdrm code in drmOpenByName somehow survived, hence this can't be | |
96 | * broken. | |
97 | */ | |
98 | ||
0aaf20cf | 99 | /* |
1da177e4 | 100 | * Get the bus id. |
b5e89ed5 | 101 | * |
1da177e4 | 102 | * \param inode device inode. |
6c340eac | 103 | * \param file_priv DRM file private. |
1da177e4 LT |
104 | * \param cmd command. |
105 | * \param arg user argument, pointing to a drm_unique structure. | |
106 | * \return zero on success or a negative number on failure. | |
107 | * | |
108 | * Copies the bus id from drm_device::unique into user space. | |
109 | */ | |
17e3dade | 110 | int drm_getunique(struct drm_device *dev, void *data, |
c153f45f | 111 | struct drm_file *file_priv) |
1da177e4 | 112 | { |
c153f45f | 113 | struct drm_unique *u = data; |
7c1c2871 | 114 | struct drm_master *master = file_priv->master; |
1da177e4 | 115 | |
5acc614a | 116 | mutex_lock(&master->dev->master_mutex); |
7c1c2871 | 117 | if (u->unique_len >= master->unique_len) { |
5acc614a DV |
118 | if (copy_to_user(u->unique, master->unique, master->unique_len)) { |
119 | mutex_unlock(&master->dev->master_mutex); | |
1da177e4 | 120 | return -EFAULT; |
5acc614a | 121 | } |
1da177e4 | 122 | } |
7c1c2871 | 123 | u->unique_len = master->unique_len; |
5acc614a | 124 | mutex_unlock(&master->dev->master_mutex); |
c153f45f | 125 | |
1da177e4 LT |
126 | return 0; |
127 | } | |
128 | ||
3fb688fd CW |
129 | static void |
130 | drm_unset_busid(struct drm_device *dev, | |
131 | struct drm_master *master) | |
132 | { | |
3fb688fd CW |
133 | kfree(master->unique); |
134 | master->unique = NULL; | |
135 | master->unique_len = 0; | |
3fb688fd CW |
136 | } |
137 | ||
7c1c2871 | 138 | static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) |
1da177e4 | 139 | { |
7c1c2871 | 140 | struct drm_master *master = file_priv->master; |
8410ea3b | 141 | int ret; |
3fb688fd CW |
142 | |
143 | if (master->unique != NULL) | |
144 | drm_unset_busid(dev, master); | |
fe34765b | 145 | |
22a884cf | 146 | if (dev->dev && dev_is_pci(dev->dev)) { |
5c484cee | 147 | ret = drm_pci_set_busid(dev, master); |
915b4d11 DH |
148 | if (ret) { |
149 | drm_unset_busid(dev, master); | |
150 | return ret; | |
151 | } | |
ca8e2ad7 | 152 | } else { |
5079c464 | 153 | WARN_ON(!dev->unique); |
ca8e2ad7 TR |
154 | master->unique = kstrdup(dev->unique, GFP_KERNEL); |
155 | if (master->unique) | |
156 | master->unique_len = strlen(dev->unique); | |
157 | } | |
158 | ||
1da177e4 LT |
159 | return 0; |
160 | } | |
161 | ||
0aaf20cf | 162 | /* |
1da177e4 LT |
163 | * Get client information. |
164 | * | |
165 | * \param inode device inode. | |
6c340eac | 166 | * \param file_priv DRM file private. |
1da177e4 LT |
167 | * \param cmd command. |
168 | * \param arg user argument, pointing to a drm_client structure. | |
b5e89ed5 | 169 | * |
1da177e4 LT |
170 | * \return zero on success or a negative number on failure. |
171 | * | |
172 | * Searches for the client with the specified index and copies its information | |
173 | * into userspace | |
174 | */ | |
9e92662d | 175 | int drm_getclient(struct drm_device *dev, void *data, |
c153f45f | 176 | struct drm_file *file_priv) |
1da177e4 | 177 | { |
c153f45f | 178 | struct drm_client *client = data; |
09b4ea47 | 179 | |
719524df DV |
180 | /* |
181 | * Hollowed-out getclient ioctl to keep some dead old drm tests/tools | |
182 | * not breaking completely. Userspace tools stop enumerating one they | |
183 | * get -EINVAL, hence this is the return value we need to hand back for | |
184 | * no clients tracked. | |
185 | * | |
186 | * Unfortunately some clients (*cough* libva *cough*) use this in a fun | |
187 | * attempt to figure out whether they're authenticated or not. Since | |
188 | * that's the only thing they care about, give it to the directly | |
189 | * instead of walking one giant list. | |
190 | */ | |
191 | if (client->idx == 0) { | |
192 | client->auth = file_priv->authenticated; | |
a8c79818 DH |
193 | client->pid = task_pid_vnr(current); |
194 | client->uid = overflowuid; | |
719524df DV |
195 | client->magic = 0; |
196 | client->iocs = 0; | |
197 | ||
198 | return 0; | |
199 | } else { | |
200 | return -EINVAL; | |
bd1b331f | 201 | } |
1da177e4 LT |
202 | } |
203 | ||
0aaf20cf | 204 | /* |
b5e89ed5 DA |
205 | * Get statistics information. |
206 | * | |
1da177e4 | 207 | * \param inode device inode. |
6c340eac | 208 | * \param file_priv DRM file private. |
1da177e4 LT |
209 | * \param cmd command. |
210 | * \param arg user argument, pointing to a drm_stats structure. | |
b5e89ed5 | 211 | * |
1da177e4 LT |
212 | * \return zero on success or a negative number on failure. |
213 | */ | |
78238757 | 214 | static int drm_getstats(struct drm_device *dev, void *data, |
c153f45f | 215 | struct drm_file *file_priv) |
1da177e4 | 216 | { |
c153f45f | 217 | struct drm_stats *stats = data; |
1da177e4 | 218 | |
d79cdc83 | 219 | /* Clear stats to prevent userspace from eating its stack garbage. */ |
246a3d18 | 220 | memset(stats, 0, sizeof(*stats)); |
b5e89ed5 | 221 | |
1da177e4 LT |
222 | return 0; |
223 | } | |
224 | ||
0aaf20cf | 225 | /* |
9f35421e BS |
226 | * Get device/driver capabilities |
227 | */ | |
78238757 | 228 | static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
9f35421e BS |
229 | { |
230 | struct drm_get_cap *req = data; | |
f837297a | 231 | struct drm_crtc *crtc; |
9f35421e BS |
232 | |
233 | req->value = 0; | |
d5264ed3 | 234 | |
f3f4c4d6 DV |
235 | /* Only some caps make sense with UMS/render-only drivers. */ |
236 | switch (req->capability) { | |
237 | case DRM_CAP_TIMESTAMP_MONOTONIC: | |
25e1a798 | 238 | req->value = 1; |
d5264ed3 | 239 | return 0; |
f3f4c4d6 DV |
240 | case DRM_CAP_PRIME: |
241 | req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; | |
242 | req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; | |
243 | return 0; | |
e9083420 DA |
244 | case DRM_CAP_SYNCOBJ: |
245 | req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ); | |
246 | return 0; | |
d5264ed3 MD |
247 | } |
248 | ||
249 | /* Other caps only work with KMS drivers */ | |
250 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
251 | return -ENOTSUPP; | |
252 | ||
e73f88af DA |
253 | switch (req->capability) { |
254 | case DRM_CAP_DUMB_BUFFER: | |
255 | if (dev->driver->dumb_create) | |
256 | req->value = 1; | |
257 | break; | |
51eab416 | 258 | case DRM_CAP_VBLANK_HIGH_CRTC: |
19b01b5f IH |
259 | req->value = 1; |
260 | break; | |
019d96cb DA |
261 | case DRM_CAP_DUMB_PREFERRED_DEPTH: |
262 | req->value = dev->mode_config.preferred_depth; | |
263 | break; | |
264 | case DRM_CAP_DUMB_PREFER_SHADOW: | |
265 | req->value = dev->mode_config.prefer_shadow; | |
266 | break; | |
62f2104f KP |
267 | case DRM_CAP_ASYNC_PAGE_FLIP: |
268 | req->value = dev->mode_config.async_page_flip; | |
269 | break; | |
f837297a | 270 | case DRM_CAP_PAGE_FLIP_TARGET: |
d5264ed3 MD |
271 | req->value = 1; |
272 | drm_for_each_crtc(crtc, dev) { | |
273 | if (!crtc->funcs->page_flip_target) | |
274 | req->value = 0; | |
f837297a MD |
275 | } |
276 | break; | |
8716ed4e AD |
277 | case DRM_CAP_CURSOR_WIDTH: |
278 | if (dev->mode_config.cursor_width) | |
279 | req->value = dev->mode_config.cursor_width; | |
280 | else | |
281 | req->value = 64; | |
282 | break; | |
283 | case DRM_CAP_CURSOR_HEIGHT: | |
284 | if (dev->mode_config.cursor_height) | |
285 | req->value = dev->mode_config.cursor_height; | |
286 | else | |
287 | req->value = 64; | |
288 | break; | |
e3eb3250 RC |
289 | case DRM_CAP_ADDFB2_MODIFIERS: |
290 | req->value = dev->mode_config.allow_fb_modifiers; | |
291 | break; | |
5db06a8a ACO |
292 | case DRM_CAP_CRTC_IN_VBLANK_EVENT: |
293 | req->value = 1; | |
294 | break; | |
e73f88af DA |
295 | default: |
296 | return -EINVAL; | |
297 | } | |
9f35421e BS |
298 | return 0; |
299 | } | |
300 | ||
0aaf20cf | 301 | /* |
1c0814fe DL |
302 | * Set device/driver capabilities |
303 | */ | |
78238757 | 304 | static int |
1c0814fe DL |
305 | drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
306 | { | |
61d8e328 DL |
307 | struct drm_set_client_cap *req = data; |
308 | ||
309 | switch (req->capability) { | |
310 | case DRM_CLIENT_CAP_STEREO_3D: | |
311 | if (req->value > 1) | |
312 | return -EINVAL; | |
313 | file_priv->stereo_allowed = req->value; | |
314 | break; | |
681e7ec7 | 315 | case DRM_CLIENT_CAP_UNIVERSAL_PLANES: |
681e7ec7 MR |
316 | if (req->value > 1) |
317 | return -EINVAL; | |
318 | file_priv->universal_planes = req->value; | |
319 | break; | |
88a48e29 | 320 | case DRM_CLIENT_CAP_ATOMIC: |
88a48e29 RC |
321 | if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) |
322 | return -EINVAL; | |
323 | if (req->value > 1) | |
324 | return -EINVAL; | |
325 | file_priv->atomic = req->value; | |
179f158c | 326 | file_priv->universal_planes = req->value; |
7595bda2 AN |
327 | /* |
328 | * No atomic user-space blows up on aspect ratio mode bits. | |
329 | */ | |
330 | file_priv->aspect_ratio_allowed = req->value; | |
331 | break; | |
332 | case DRM_CLIENT_CAP_ASPECT_RATIO: | |
333 | if (req->value > 1) | |
334 | return -EINVAL; | |
335 | file_priv->aspect_ratio_allowed = req->value; | |
88a48e29 | 336 | break; |
d67b6a20 LD |
337 | case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS: |
338 | if (!file_priv->atomic) | |
339 | return -EINVAL; | |
340 | if (req->value > 1) | |
341 | return -EINVAL; | |
342 | file_priv->writeback_connectors = req->value; | |
343 | break; | |
61d8e328 DL |
344 | default: |
345 | return -EINVAL; | |
346 | } | |
347 | ||
348 | return 0; | |
1c0814fe DL |
349 | } |
350 | ||
0aaf20cf | 351 | /* |
1da177e4 LT |
352 | * Setversion ioctl. |
353 | * | |
354 | * \param inode device inode. | |
6c340eac | 355 | * \param file_priv DRM file private. |
1da177e4 LT |
356 | * \param cmd command. |
357 | * \param arg user argument, pointing to a drm_lock structure. | |
358 | * \return zero on success or negative number on failure. | |
359 | * | |
360 | * Sets the requested interface version | |
361 | */ | |
78238757 | 362 | static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 | 363 | { |
c153f45f EA |
364 | struct drm_set_version *sv = data; |
365 | int if_version, retcode = 0; | |
366 | ||
5acc614a | 367 | mutex_lock(&dev->master_mutex); |
c153f45f EA |
368 | if (sv->drm_di_major != -1) { |
369 | if (sv->drm_di_major != DRM_IF_MAJOR || | |
370 | sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { | |
371 | retcode = -EINVAL; | |
372 | goto done; | |
373 | } | |
374 | if_version = DRM_IF_VERSION(sv->drm_di_major, | |
375 | sv->drm_di_minor); | |
3d77461e | 376 | dev->if_version = max(if_version, dev->if_version); |
c153f45f | 377 | if (sv->drm_di_minor >= 1) { |
1da177e4 LT |
378 | /* |
379 | * Version 1.1 includes tying of DRM to specific device | |
c17c2f89 | 380 | * Version 1.4 has proper PCI domain support |
1da177e4 | 381 | */ |
3fb688fd CW |
382 | retcode = drm_set_busid(dev, file_priv); |
383 | if (retcode) | |
384 | goto done; | |
1da177e4 LT |
385 | } |
386 | } | |
387 | ||
c153f45f EA |
388 | if (sv->drm_dd_major != -1) { |
389 | if (sv->drm_dd_major != dev->driver->major || | |
390 | sv->drm_dd_minor < 0 || sv->drm_dd_minor > | |
391 | dev->driver->minor) { | |
392 | retcode = -EINVAL; | |
393 | goto done; | |
394 | } | |
1da177e4 | 395 | } |
c153f45f EA |
396 | |
397 | done: | |
398 | sv->drm_di_major = DRM_IF_MAJOR; | |
399 | sv->drm_di_minor = DRM_IF_MINOR; | |
400 | sv->drm_dd_major = dev->driver->major; | |
401 | sv->drm_dd_minor = dev->driver->minor; | |
5acc614a | 402 | mutex_unlock(&dev->master_mutex); |
c153f45f EA |
403 | |
404 | return retcode; | |
1da177e4 LT |
405 | } |
406 | ||
0aaf20cf DV |
407 | /** |
408 | * drm_noop - DRM no-op ioctl implemntation | |
409 | * @dev: DRM device for the ioctl | |
410 | * @data: data pointer for the ioctl | |
411 | * @file_priv: DRM file for the ioctl call | |
412 | * | |
413 | * This no-op implementation for drm ioctls is useful for deprecated | |
414 | * functionality where we can't return a failure code because existing userspace | |
415 | * checks the result of the ioctl, but doesn't care about the action. | |
416 | * | |
417 | * Always returns successfully with 0. | |
418 | */ | |
c153f45f EA |
419 | int drm_noop(struct drm_device *dev, void *data, |
420 | struct drm_file *file_priv) | |
1da177e4 LT |
421 | { |
422 | DRM_DEBUG("\n"); | |
423 | return 0; | |
424 | } | |
b2c606fe | 425 | EXPORT_SYMBOL(drm_noop); |
ec8f112d | 426 | |
0aaf20cf DV |
427 | /** |
428 | * drm_invalid_op - DRM invalid ioctl implemntation | |
429 | * @dev: DRM device for the ioctl | |
430 | * @data: data pointer for the ioctl | |
431 | * @file_priv: DRM file for the ioctl call | |
432 | * | |
433 | * This no-op implementation for drm ioctls is useful for deprecated | |
434 | * functionality where we really don't want to allow userspace to call the ioctl | |
435 | * any more. This is the case for old ums interfaces for drivers that | |
436 | * transitioned to kms gradually and so kept the old legacy tables around. This | |
437 | * only applies to radeon and i915 kms drivers, other drivers shouldn't need to | |
438 | * use this function. | |
439 | * | |
440 | * Always fails with a return value of -EINVAL. | |
441 | */ | |
4b63539b DV |
442 | int drm_invalid_op(struct drm_device *dev, void *data, |
443 | struct drm_file *file_priv) | |
444 | { | |
445 | return -EINVAL; | |
446 | } | |
447 | EXPORT_SYMBOL(drm_invalid_op); | |
448 | ||
0aaf20cf | 449 | /* |
ec8f112d DH |
450 | * Copy and IOCTL return string to user space |
451 | */ | |
452 | static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) | |
453 | { | |
454 | int len; | |
455 | ||
456 | /* don't overflow userbuf */ | |
457 | len = strlen(value); | |
458 | if (len > *buf_len) | |
459 | len = *buf_len; | |
460 | ||
461 | /* let userspace know exact length of driver value (which could be | |
462 | * larger than the userspace-supplied buffer) */ | |
463 | *buf_len = strlen(value); | |
464 | ||
465 | /* finally, try filling in the userbuf */ | |
466 | if (len && buf) | |
467 | if (copy_to_user(buf, value, len)) | |
468 | return -EFAULT; | |
469 | return 0; | |
470 | } | |
471 | ||
0aaf20cf | 472 | /* |
ec8f112d DH |
473 | * Get version information |
474 | * | |
475 | * \param inode device inode. | |
476 | * \param filp file pointer. | |
477 | * \param cmd command. | |
478 | * \param arg user argument, pointing to a drm_version structure. | |
479 | * \return zero on success or negative number on failure. | |
480 | * | |
481 | * Fills in the version information in \p arg. | |
482 | */ | |
012c6741 | 483 | int drm_version(struct drm_device *dev, void *data, |
ec8f112d DH |
484 | struct drm_file *file_priv) |
485 | { | |
486 | struct drm_version *version = data; | |
487 | int err; | |
488 | ||
489 | version->version_major = dev->driver->major; | |
490 | version->version_minor = dev->driver->minor; | |
491 | version->version_patchlevel = dev->driver->patchlevel; | |
492 | err = drm_copy_field(version->name, &version->name_len, | |
493 | dev->driver->name); | |
494 | if (!err) | |
495 | err = drm_copy_field(version->date, &version->date_len, | |
496 | dev->driver->date); | |
497 | if (!err) | |
498 | err = drm_copy_field(version->desc, &version->desc_len, | |
499 | dev->driver->desc); | |
500 | ||
501 | return err; | |
502 | } | |
503 | ||
5bbf92d3 | 504 | /** |
ec8f112d DH |
505 | * drm_ioctl_permit - Check ioctl permissions against caller |
506 | * | |
507 | * @flags: ioctl permission flags. | |
508 | * @file_priv: Pointer to struct drm_file identifying the caller. | |
509 | * | |
510 | * Checks whether the caller is allowed to run an ioctl with the | |
5bbf92d3 GKB |
511 | * indicated permissions. |
512 | * | |
513 | * Returns: | |
514 | * Zero if allowed, -EACCES otherwise. | |
ec8f112d | 515 | */ |
5101020c | 516 | int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) |
ec8f112d DH |
517 | { |
518 | /* ROOT_ONLY is only for CAP_SYS_ADMIN */ | |
519 | if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) | |
520 | return -EACCES; | |
521 | ||
522 | /* AUTH is only for authenticated or render client */ | |
523 | if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && | |
524 | !file_priv->authenticated)) | |
525 | return -EACCES; | |
526 | ||
527 | /* MASTER is only for master or control clients */ | |
937f3acc | 528 | if (unlikely((flags & DRM_MASTER) && |
0d49f303 | 529 | !drm_is_current_master(file_priv))) |
ec8f112d DH |
530 | return -EACCES; |
531 | ||
532 | /* Render clients must be explicitly allowed */ | |
533 | if (unlikely(!(flags & DRM_RENDER_ALLOW) && | |
534 | drm_is_render_client(file_priv))) | |
535 | return -EACCES; | |
536 | ||
537 | return 0; | |
538 | } | |
5101020c | 539 | EXPORT_SYMBOL(drm_ioctl_permit); |
ec8f112d | 540 | |
066626d5 EV |
541 | #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ |
542 | [DRM_IOCTL_NR(ioctl)] = { \ | |
543 | .cmd = ioctl, \ | |
544 | .func = _func, \ | |
545 | .flags = _flags, \ | |
546 | .name = #ioctl \ | |
547 | } | |
78238757 | 548 | |
0aaf20cf | 549 | /* Ioctl table */ |
78238757 | 550 | static const struct drm_ioctl_desc drm_ioctls[] = { |
30c64664 | 551 | DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, |
5bb562f8 | 552 | DRM_UNLOCKED|DRM_RENDER_ALLOW), |
5acc614a | 553 | DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, DRM_UNLOCKED), |
94e86f5d | 554 | DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED), |
78238757 | 555 | DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), |
ec1f52ef | 556 | DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED), |
78238757 DV |
557 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), |
558 | DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), | |
559 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
dcf727ab | 560 | DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, DRM_UNLOCKED), |
5acc614a | 561 | DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_UNLOCKED | DRM_MASTER), |
78238757 | 562 | |
46bfdf9a | 563 | DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
78238757 DV |
564 | DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
565 | DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
94e86f5d | 566 | DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER), |
78238757 DV |
567 | |
568 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
569 | DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), | |
570 | ||
571 | DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
572 | DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), | |
573 | ||
ce833ba9 DV |
574 | DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), |
575 | DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), | |
78238757 DV |
576 | |
577 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), | |
578 | DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
579 | DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
580 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), | |
581 | DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
582 | DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
583 | DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), | |
584 | ||
585 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
586 | DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
587 | ||
588 | DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), | |
589 | DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), | |
590 | ||
591 | DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), | |
592 | ||
593 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
594 | DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
595 | DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), | |
596 | DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), | |
597 | DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), | |
598 | DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), | |
599 | ||
25a9939c | 600 | DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
78238757 | 601 | |
a7fb8a23 | 602 | #if IS_ENABLED(CONFIG_AGP) |
78238757 DV |
603 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
604 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
605 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
606 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), | |
607 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
608 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
609 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
610 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
611 | #endif | |
612 | ||
613 | DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
614 | DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
615 | ||
b6dcaaac | 616 | DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED), |
78238757 | 617 | |
b6dcaaac | 618 | DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0), |
78238757 DV |
619 | |
620 | DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
621 | ||
622 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
623 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), | |
624 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), | |
625 | ||
5bb562f8 | 626 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_UNLOCKED), |
78238757 DV |
627 | |
628 | DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
629 | DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
630 | ||
5bb562f8 DV |
631 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_UNLOCKED), |
632 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_UNLOCKED), | |
633 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_UNLOCKED), | |
634 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_UNLOCKED), | |
635 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_UNLOCKED), | |
636 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
78238757 DV |
637 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), |
638 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
5bb562f8 DV |
639 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_UNLOCKED), |
640 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_UNLOCKED), | |
641 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_UNLOCKED), | |
642 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_UNLOCKED), | |
643 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_UNLOCKED), | |
644 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
645 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_UNLOCKED), | |
646 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_UNLOCKED), | |
d30827ce | 647 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, DRM_UNLOCKED), |
5bb562f8 | 648 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_UNLOCKED), |
d30827ce | 649 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, DRM_UNLOCKED), |
5bb562f8 DV |
650 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_UNLOCKED), |
651 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
652 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_UNLOCKED), | |
653 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_UNLOCKED), | |
654 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_UNLOCKED), | |
655 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_UNLOCKED), | |
656 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
657 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
658 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
659 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_UNLOCKED), | |
660 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_UNLOCKED), | |
e9083420 DA |
661 | |
662 | DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, | |
663 | DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
664 | DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, | |
665 | DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
666 | DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, | |
667 | DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
668 | DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, | |
669 | DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
5e60a10e DA |
670 | DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, |
671 | DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
aa4035d2 JE |
672 | DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, |
673 | DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
ffa9443f JE |
674 | DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, |
675 | DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
3064abfa KP |
676 | DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, DRM_UNLOCKED), |
677 | DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, DRM_UNLOCKED), | |
5bb562f8 DV |
678 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), |
679 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
680 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
681 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
78238757 DV |
682 | }; |
683 | ||
684 | #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) | |
685 | ||
2640981f DV |
686 | /** |
687 | * DOC: driver specific ioctls | |
688 | * | |
689 | * First things first, driver private IOCTLs should only be needed for drivers | |
690 | * supporting rendering. Kernel modesetting is all standardized, and extended | |
691 | * through properties. There are a few exceptions in some existing drivers, | |
692 | * which define IOCTL for use by the display DRM master, but they all predate | |
693 | * properties. | |
694 | * | |
695 | * Now if you do have a render driver you always have to support it through | |
696 | * driver private properties. There's a few steps needed to wire all the things | |
697 | * up. | |
698 | * | |
699 | * First you need to define the structure for your IOCTL in your driver private | |
700 | * UAPI header in ``include/uapi/drm/my_driver_drm.h``:: | |
701 | * | |
702 | * struct my_driver_operation { | |
703 | * u32 some_thing; | |
704 | * u32 another_thing; | |
705 | * }; | |
706 | * | |
707 | * Please make sure that you follow all the best practices from | |
708 | * ``Documentation/ioctl/botching-up-ioctls.txt``. Note that drm_ioctl() | |
709 | * automatically zero-extends structures, hence make sure you can add more stuff | |
710 | * at the end, i.e. don't put a variable sized array there. | |
711 | * | |
712 | * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(), | |
713 | * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix:: | |
714 | * | |
715 | * ##define DRM_IOCTL_MY_DRIVER_OPERATION \ | |
716 | * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation) | |
937f3acc | 717 | * |
2640981f DV |
718 | * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to |
719 | * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire | |
bb2eaba6 | 720 | * up the handlers and set the access rights:: |
2640981f DV |
721 | * |
722 | * static const struct drm_ioctl_desc my_driver_ioctls[] = { | |
723 | * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation, | |
724 | * DRM_AUTH|DRM_RENDER_ALLOW), | |
725 | * }; | |
726 | * | |
727 | * And then assign this to the &drm_driver.ioctls field in your driver | |
728 | * structure. | |
bb2eaba6 DV |
729 | * |
730 | * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how | |
731 | * the driver-specific IOCTLs are wired up. | |
2640981f DV |
732 | */ |
733 | ||
7f0dfc16 AV |
734 | long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata, |
735 | u32 flags) | |
736 | { | |
737 | struct drm_file *file_priv = file->private_data; | |
738 | struct drm_device *dev = file_priv->minor->dev; | |
739 | int retcode; | |
740 | ||
c07dcd61 | 741 | if (drm_dev_is_unplugged(dev)) |
7f0dfc16 AV |
742 | return -ENODEV; |
743 | ||
744 | retcode = drm_ioctl_permit(flags, file_priv); | |
745 | if (unlikely(retcode)) | |
746 | return retcode; | |
747 | ||
748 | /* Enforce sane locking for modern driver ioctls. */ | |
749 | if (!drm_core_check_feature(dev, DRIVER_LEGACY) || | |
750 | (flags & DRM_UNLOCKED)) | |
751 | retcode = func(dev, kdata, file_priv); | |
752 | else { | |
753 | mutex_lock(&drm_global_mutex); | |
754 | retcode = func(dev, kdata, file_priv); | |
755 | mutex_unlock(&drm_global_mutex); | |
756 | } | |
757 | return retcode; | |
758 | } | |
aeba0390 | 759 | EXPORT_SYMBOL(drm_ioctl_kernel); |
7f0dfc16 | 760 | |
ec8f112d | 761 | /** |
0aaf20cf DV |
762 | * drm_ioctl - ioctl callback implementation for DRM drivers |
763 | * @filp: file this ioctl is called on | |
764 | * @cmd: ioctl cmd number | |
765 | * @arg: user argument | |
ec8f112d | 766 | * |
2640981f DV |
767 | * Looks up the ioctl function in the DRM core and the driver dispatch table, |
768 | * stored in &drm_driver.ioctls. It checks for necessary permission by calling | |
769 | * drm_ioctl_permit(), and dispatches to the respective function. | |
0aaf20cf DV |
770 | * |
771 | * Returns: | |
772 | * Zero on success, negative error code on failure. | |
ec8f112d DH |
773 | */ |
774 | long drm_ioctl(struct file *filp, | |
775 | unsigned int cmd, unsigned long arg) | |
776 | { | |
777 | struct drm_file *file_priv = filp->private_data; | |
778 | struct drm_device *dev; | |
779 | const struct drm_ioctl_desc *ioctl = NULL; | |
780 | drm_ioctl_t *func; | |
781 | unsigned int nr = DRM_IOCTL_NR(cmd); | |
782 | int retcode = -EINVAL; | |
783 | char stack_kdata[128]; | |
784 | char *kdata = NULL; | |
01d3434a | 785 | unsigned int in_size, out_size, drv_size, ksize; |
ea487835 | 786 | bool is_driver_ioctl; |
ec8f112d DH |
787 | |
788 | dev = file_priv->minor->dev; | |
789 | ||
c07dcd61 | 790 | if (drm_dev_is_unplugged(dev)) |
ec8f112d DH |
791 | return -ENODEV; |
792 | ||
ea487835 DV |
793 | is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; |
794 | ||
795 | if (is_driver_ioctl) { | |
83be0038 VS |
796 | /* driver ioctl */ |
797 | if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) | |
798 | goto err_i1; | |
ec8f112d | 799 | ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; |
83be0038 VS |
800 | } else { |
801 | /* core ioctl */ | |
802 | if (nr >= DRM_CORE_IOCTL_COUNT) | |
803 | goto err_i1; | |
ec8f112d | 804 | ioctl = &drm_ioctls[nr]; |
83be0038 | 805 | } |
ec8f112d | 806 | |
83be0038 | 807 | drv_size = _IOC_SIZE(ioctl->cmd); |
01d3434a CW |
808 | out_size = in_size = _IOC_SIZE(cmd); |
809 | if ((cmd & ioctl->cmd & IOC_IN) == 0) | |
810 | in_size = 0; | |
811 | if ((cmd & ioctl->cmd & IOC_OUT) == 0) | |
812 | out_size = 0; | |
813 | ksize = max(max(in_size, out_size), drv_size); | |
ec8f112d DH |
814 | |
815 | DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", | |
816 | task_pid_nr(current), | |
817 | (long)old_encode_dev(file_priv->minor->kdev->devt), | |
818 | file_priv->authenticated, ioctl->name); | |
819 | ||
820 | /* Do not trust userspace, use our own definition */ | |
821 | func = ioctl->func; | |
822 | ||
823 | if (unlikely(!func)) { | |
824 | DRM_DEBUG("no function\n"); | |
825 | retcode = -EINVAL; | |
826 | goto err_i1; | |
827 | } | |
828 | ||
01d3434a CW |
829 | if (ksize <= sizeof(stack_kdata)) { |
830 | kdata = stack_kdata; | |
831 | } else { | |
832 | kdata = kmalloc(ksize, GFP_KERNEL); | |
833 | if (!kdata) { | |
834 | retcode = -ENOMEM; | |
835 | goto err_i1; | |
ec8f112d | 836 | } |
ec8f112d DH |
837 | } |
838 | ||
01d3434a CW |
839 | if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { |
840 | retcode = -EFAULT; | |
841 | goto err_i1; | |
ec8f112d DH |
842 | } |
843 | ||
01d3434a CW |
844 | if (ksize > in_size) |
845 | memset(kdata + in_size, 0, ksize - in_size); | |
846 | ||
7f0dfc16 | 847 | retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); |
01d3434a CW |
848 | if (copy_to_user((void __user *)arg, kdata, out_size) != 0) |
849 | retcode = -EFAULT; | |
ec8f112d DH |
850 | |
851 | err_i1: | |
852 | if (!ioctl) | |
853 | DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", | |
854 | task_pid_nr(current), | |
855 | (long)old_encode_dev(file_priv->minor->kdev->devt), | |
856 | file_priv->authenticated, cmd, nr); | |
857 | ||
858 | if (kdata != stack_kdata) | |
859 | kfree(kdata); | |
860 | if (retcode) | |
9c950e46 | 861 | DRM_DEBUG("pid=%d, ret = %d\n", task_pid_nr(current), retcode); |
ec8f112d DH |
862 | return retcode; |
863 | } | |
864 | EXPORT_SYMBOL(drm_ioctl); | |
865 | ||
866 | /** | |
867 | * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags | |
0aaf20cf DV |
868 | * @nr: ioctl number |
869 | * @flags: where to return the ioctl permission flags | |
870 | * | |
871 | * This ioctl is only used by the vmwgfx driver to augment the access checks | |
872 | * done by the drm core and insofar a pretty decent layering violation. This | |
873 | * shouldn't be used by any drivers. | |
ec8f112d | 874 | * |
0aaf20cf | 875 | * Returns: |
2ae99588 | 876 | * True if the @nr corresponds to a DRM core ioctl number, false otherwise. |
ec8f112d DH |
877 | */ |
878 | bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) | |
879 | { | |
7ef5f82b VS |
880 | if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) |
881 | return false; | |
882 | ||
883 | if (nr >= DRM_CORE_IOCTL_COUNT) | |
884 | return false; | |
ec8f112d | 885 | |
7ef5f82b VS |
886 | *flags = drm_ioctls[nr].flags; |
887 | return true; | |
ec8f112d DH |
888 | } |
889 | EXPORT_SYMBOL(drm_ioctl_flags); |