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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 | ||
760285e7 DH |
31 | #include <drm/drmP.h> |
32 | #include <drm/drm_core.h> | |
e7b96070 | 33 | #include "drm_legacy.h" |
18882995 | 34 | #include "drm_internal.h" |
a97df1cc | 35 | #include "drm_crtc_internal.h" |
1da177e4 | 36 | |
760285e7 DH |
37 | #include <linux/pci.h> |
38 | #include <linux/export.h> | |
1da177e4 | 39 | |
a3257256 DV |
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 | ||
ec8f112d DH |
98 | static int drm_version(struct drm_device *dev, void *data, |
99 | struct drm_file *file_priv); | |
100 | ||
0aaf20cf | 101 | /* |
1da177e4 | 102 | * Get the bus id. |
b5e89ed5 | 103 | * |
1da177e4 | 104 | * \param inode device inode. |
6c340eac | 105 | * \param file_priv DRM file private. |
1da177e4 LT |
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 | */ | |
78238757 | 112 | static int drm_getunique(struct drm_device *dev, void *data, |
c153f45f | 113 | struct drm_file *file_priv) |
1da177e4 | 114 | { |
c153f45f | 115 | struct drm_unique *u = data; |
7c1c2871 | 116 | struct drm_master *master = file_priv->master; |
1da177e4 | 117 | |
7c1c2871 DA |
118 | if (u->unique_len >= master->unique_len) { |
119 | if (copy_to_user(u->unique, master->unique, master->unique_len)) | |
1da177e4 LT |
120 | return -EFAULT; |
121 | } | |
7c1c2871 | 122 | u->unique_len = master->unique_len; |
c153f45f | 123 | |
1da177e4 LT |
124 | return 0; |
125 | } | |
126 | ||
3fb688fd CW |
127 | static void |
128 | drm_unset_busid(struct drm_device *dev, | |
129 | struct drm_master *master) | |
130 | { | |
3fb688fd CW |
131 | kfree(master->unique); |
132 | master->unique = NULL; | |
133 | master->unique_len = 0; | |
3fb688fd CW |
134 | } |
135 | ||
7c1c2871 | 136 | static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) |
1da177e4 | 137 | { |
7c1c2871 | 138 | struct drm_master *master = file_priv->master; |
8410ea3b | 139 | int ret; |
3fb688fd CW |
140 | |
141 | if (master->unique != NULL) | |
142 | drm_unset_busid(dev, master); | |
fe34765b | 143 | |
915b4d11 DH |
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 | } | |
ca8e2ad7 | 150 | } else { |
5079c464 | 151 | WARN_ON(!dev->unique); |
ca8e2ad7 TR |
152 | master->unique = kstrdup(dev->unique, GFP_KERNEL); |
153 | if (master->unique) | |
154 | master->unique_len = strlen(dev->unique); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | return 0; |
158 | } | |
159 | ||
0aaf20cf | 160 | /* |
1da177e4 LT |
161 | * Get client information. |
162 | * | |
163 | * \param inode device inode. | |
6c340eac | 164 | * \param file_priv DRM file private. |
1da177e4 LT |
165 | * \param cmd command. |
166 | * \param arg user argument, pointing to a drm_client structure. | |
b5e89ed5 | 167 | * |
1da177e4 LT |
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 | */ | |
78238757 | 173 | static int drm_getclient(struct drm_device *dev, void *data, |
c153f45f | 174 | struct drm_file *file_priv) |
1da177e4 | 175 | { |
c153f45f | 176 | struct drm_client *client = data; |
09b4ea47 | 177 | |
719524df DV |
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 = pid_vnr(file_priv->pid); | |
192 | client->uid = from_kuid_munged(current_user_ns(), | |
193 | file_priv->uid); | |
194 | client->magic = 0; | |
195 | client->iocs = 0; | |
196 | ||
197 | return 0; | |
198 | } else { | |
199 | return -EINVAL; | |
bd1b331f | 200 | } |
1da177e4 LT |
201 | } |
202 | ||
0aaf20cf | 203 | /* |
b5e89ed5 DA |
204 | * Get statistics information. |
205 | * | |
1da177e4 | 206 | * \param inode device inode. |
6c340eac | 207 | * \param file_priv DRM file private. |
1da177e4 LT |
208 | * \param cmd command. |
209 | * \param arg user argument, pointing to a drm_stats structure. | |
b5e89ed5 | 210 | * |
1da177e4 LT |
211 | * \return zero on success or a negative number on failure. |
212 | */ | |
78238757 | 213 | static int drm_getstats(struct drm_device *dev, void *data, |
c153f45f | 214 | struct drm_file *file_priv) |
1da177e4 | 215 | { |
c153f45f | 216 | struct drm_stats *stats = data; |
1da177e4 | 217 | |
d79cdc83 | 218 | /* Clear stats to prevent userspace from eating its stack garbage. */ |
246a3d18 | 219 | memset(stats, 0, sizeof(*stats)); |
b5e89ed5 | 220 | |
1da177e4 LT |
221 | return 0; |
222 | } | |
223 | ||
0aaf20cf | 224 | /* |
9f35421e BS |
225 | * Get device/driver capabilities |
226 | */ | |
78238757 | 227 | static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
9f35421e BS |
228 | { |
229 | struct drm_get_cap *req = data; | |
230 | ||
231 | req->value = 0; | |
e73f88af DA |
232 | switch (req->capability) { |
233 | case DRM_CAP_DUMB_BUFFER: | |
234 | if (dev->driver->dumb_create) | |
235 | req->value = 1; | |
236 | break; | |
51eab416 | 237 | case DRM_CAP_VBLANK_HIGH_CRTC: |
19b01b5f IH |
238 | req->value = 1; |
239 | break; | |
019d96cb DA |
240 | case DRM_CAP_DUMB_PREFERRED_DEPTH: |
241 | req->value = dev->mode_config.preferred_depth; | |
242 | break; | |
243 | case DRM_CAP_DUMB_PREFER_SHADOW: | |
244 | req->value = dev->mode_config.prefer_shadow; | |
245 | break; | |
4271a409 DA |
246 | case DRM_CAP_PRIME: |
247 | req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0; | |
248 | req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0; | |
249 | break; | |
c61eef72 ID |
250 | case DRM_CAP_TIMESTAMP_MONOTONIC: |
251 | req->value = drm_timestamp_monotonic; | |
252 | break; | |
62f2104f KP |
253 | case DRM_CAP_ASYNC_PAGE_FLIP: |
254 | req->value = dev->mode_config.async_page_flip; | |
255 | break; | |
8716ed4e AD |
256 | case DRM_CAP_CURSOR_WIDTH: |
257 | if (dev->mode_config.cursor_width) | |
258 | req->value = dev->mode_config.cursor_width; | |
259 | else | |
260 | req->value = 64; | |
261 | break; | |
262 | case DRM_CAP_CURSOR_HEIGHT: | |
263 | if (dev->mode_config.cursor_height) | |
264 | req->value = dev->mode_config.cursor_height; | |
265 | else | |
266 | req->value = 64; | |
267 | break; | |
e3eb3250 RC |
268 | case DRM_CAP_ADDFB2_MODIFIERS: |
269 | req->value = dev->mode_config.allow_fb_modifiers; | |
270 | break; | |
e73f88af DA |
271 | default: |
272 | return -EINVAL; | |
273 | } | |
9f35421e BS |
274 | return 0; |
275 | } | |
276 | ||
0aaf20cf | 277 | /* |
1c0814fe DL |
278 | * Set device/driver capabilities |
279 | */ | |
78238757 | 280 | static int |
1c0814fe DL |
281 | drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
282 | { | |
61d8e328 DL |
283 | struct drm_set_client_cap *req = data; |
284 | ||
285 | switch (req->capability) { | |
286 | case DRM_CLIENT_CAP_STEREO_3D: | |
287 | if (req->value > 1) | |
288 | return -EINVAL; | |
289 | file_priv->stereo_allowed = req->value; | |
290 | break; | |
681e7ec7 | 291 | case DRM_CLIENT_CAP_UNIVERSAL_PLANES: |
681e7ec7 MR |
292 | if (req->value > 1) |
293 | return -EINVAL; | |
294 | file_priv->universal_planes = req->value; | |
295 | break; | |
88a48e29 | 296 | case DRM_CLIENT_CAP_ATOMIC: |
88a48e29 RC |
297 | if (!drm_core_check_feature(dev, DRIVER_ATOMIC)) |
298 | return -EINVAL; | |
299 | if (req->value > 1) | |
300 | return -EINVAL; | |
301 | file_priv->atomic = req->value; | |
179f158c | 302 | file_priv->universal_planes = req->value; |
88a48e29 | 303 | break; |
61d8e328 DL |
304 | default: |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | return 0; | |
1c0814fe DL |
309 | } |
310 | ||
0aaf20cf | 311 | /* |
1da177e4 LT |
312 | * Setversion ioctl. |
313 | * | |
314 | * \param inode device inode. | |
6c340eac | 315 | * \param file_priv DRM file private. |
1da177e4 LT |
316 | * \param cmd command. |
317 | * \param arg user argument, pointing to a drm_lock structure. | |
318 | * \return zero on success or negative number on failure. | |
319 | * | |
320 | * Sets the requested interface version | |
321 | */ | |
78238757 | 322 | static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv) |
1da177e4 | 323 | { |
c153f45f EA |
324 | struct drm_set_version *sv = data; |
325 | int if_version, retcode = 0; | |
326 | ||
327 | if (sv->drm_di_major != -1) { | |
328 | if (sv->drm_di_major != DRM_IF_MAJOR || | |
329 | sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) { | |
330 | retcode = -EINVAL; | |
331 | goto done; | |
332 | } | |
333 | if_version = DRM_IF_VERSION(sv->drm_di_major, | |
334 | sv->drm_di_minor); | |
3d77461e | 335 | dev->if_version = max(if_version, dev->if_version); |
c153f45f | 336 | if (sv->drm_di_minor >= 1) { |
1da177e4 LT |
337 | /* |
338 | * Version 1.1 includes tying of DRM to specific device | |
c17c2f89 | 339 | * Version 1.4 has proper PCI domain support |
1da177e4 | 340 | */ |
3fb688fd CW |
341 | retcode = drm_set_busid(dev, file_priv); |
342 | if (retcode) | |
343 | goto done; | |
1da177e4 LT |
344 | } |
345 | } | |
346 | ||
c153f45f EA |
347 | if (sv->drm_dd_major != -1) { |
348 | if (sv->drm_dd_major != dev->driver->major || | |
349 | sv->drm_dd_minor < 0 || sv->drm_dd_minor > | |
350 | dev->driver->minor) { | |
351 | retcode = -EINVAL; | |
352 | goto done; | |
353 | } | |
1da177e4 | 354 | } |
c153f45f EA |
355 | |
356 | done: | |
357 | sv->drm_di_major = DRM_IF_MAJOR; | |
358 | sv->drm_di_minor = DRM_IF_MINOR; | |
359 | sv->drm_dd_major = dev->driver->major; | |
360 | sv->drm_dd_minor = dev->driver->minor; | |
361 | ||
362 | return retcode; | |
1da177e4 LT |
363 | } |
364 | ||
0aaf20cf DV |
365 | /** |
366 | * drm_noop - DRM no-op ioctl implemntation | |
367 | * @dev: DRM device for the ioctl | |
368 | * @data: data pointer for the ioctl | |
369 | * @file_priv: DRM file for the ioctl call | |
370 | * | |
371 | * This no-op implementation for drm ioctls is useful for deprecated | |
372 | * functionality where we can't return a failure code because existing userspace | |
373 | * checks the result of the ioctl, but doesn't care about the action. | |
374 | * | |
375 | * Always returns successfully with 0. | |
376 | */ | |
c153f45f EA |
377 | int drm_noop(struct drm_device *dev, void *data, |
378 | struct drm_file *file_priv) | |
1da177e4 LT |
379 | { |
380 | DRM_DEBUG("\n"); | |
381 | return 0; | |
382 | } | |
b2c606fe | 383 | EXPORT_SYMBOL(drm_noop); |
ec8f112d | 384 | |
0aaf20cf DV |
385 | /** |
386 | * drm_invalid_op - DRM invalid ioctl implemntation | |
387 | * @dev: DRM device for the ioctl | |
388 | * @data: data pointer for the ioctl | |
389 | * @file_priv: DRM file for the ioctl call | |
390 | * | |
391 | * This no-op implementation for drm ioctls is useful for deprecated | |
392 | * functionality where we really don't want to allow userspace to call the ioctl | |
393 | * any more. This is the case for old ums interfaces for drivers that | |
394 | * transitioned to kms gradually and so kept the old legacy tables around. This | |
395 | * only applies to radeon and i915 kms drivers, other drivers shouldn't need to | |
396 | * use this function. | |
397 | * | |
398 | * Always fails with a return value of -EINVAL. | |
399 | */ | |
4b63539b DV |
400 | int drm_invalid_op(struct drm_device *dev, void *data, |
401 | struct drm_file *file_priv) | |
402 | { | |
403 | return -EINVAL; | |
404 | } | |
405 | EXPORT_SYMBOL(drm_invalid_op); | |
406 | ||
0aaf20cf | 407 | /* |
ec8f112d DH |
408 | * Copy and IOCTL return string to user space |
409 | */ | |
410 | static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value) | |
411 | { | |
412 | int len; | |
413 | ||
414 | /* don't overflow userbuf */ | |
415 | len = strlen(value); | |
416 | if (len > *buf_len) | |
417 | len = *buf_len; | |
418 | ||
419 | /* let userspace know exact length of driver value (which could be | |
420 | * larger than the userspace-supplied buffer) */ | |
421 | *buf_len = strlen(value); | |
422 | ||
423 | /* finally, try filling in the userbuf */ | |
424 | if (len && buf) | |
425 | if (copy_to_user(buf, value, len)) | |
426 | return -EFAULT; | |
427 | return 0; | |
428 | } | |
429 | ||
0aaf20cf | 430 | /* |
ec8f112d DH |
431 | * Get version information |
432 | * | |
433 | * \param inode device inode. | |
434 | * \param filp file pointer. | |
435 | * \param cmd command. | |
436 | * \param arg user argument, pointing to a drm_version structure. | |
437 | * \return zero on success or negative number on failure. | |
438 | * | |
439 | * Fills in the version information in \p arg. | |
440 | */ | |
441 | static int drm_version(struct drm_device *dev, void *data, | |
442 | struct drm_file *file_priv) | |
443 | { | |
444 | struct drm_version *version = data; | |
445 | int err; | |
446 | ||
447 | version->version_major = dev->driver->major; | |
448 | version->version_minor = dev->driver->minor; | |
449 | version->version_patchlevel = dev->driver->patchlevel; | |
450 | err = drm_copy_field(version->name, &version->name_len, | |
451 | dev->driver->name); | |
452 | if (!err) | |
453 | err = drm_copy_field(version->date, &version->date_len, | |
454 | dev->driver->date); | |
455 | if (!err) | |
456 | err = drm_copy_field(version->desc, &version->desc_len, | |
457 | dev->driver->desc); | |
458 | ||
459 | return err; | |
460 | } | |
461 | ||
0aaf20cf | 462 | /* |
ec8f112d DH |
463 | * drm_ioctl_permit - Check ioctl permissions against caller |
464 | * | |
465 | * @flags: ioctl permission flags. | |
466 | * @file_priv: Pointer to struct drm_file identifying the caller. | |
467 | * | |
468 | * Checks whether the caller is allowed to run an ioctl with the | |
469 | * indicated permissions. If so, returns zero. Otherwise returns an | |
470 | * error code suitable for ioctl return. | |
471 | */ | |
5101020c | 472 | int drm_ioctl_permit(u32 flags, struct drm_file *file_priv) |
ec8f112d DH |
473 | { |
474 | /* ROOT_ONLY is only for CAP_SYS_ADMIN */ | |
475 | if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN))) | |
476 | return -EACCES; | |
477 | ||
478 | /* AUTH is only for authenticated or render client */ | |
479 | if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) && | |
480 | !file_priv->authenticated)) | |
481 | return -EACCES; | |
482 | ||
483 | /* MASTER is only for master or control clients */ | |
7963e9db | 484 | if (unlikely((flags & DRM_MASTER) && !file_priv->is_master && |
ec8f112d DH |
485 | !drm_is_control_client(file_priv))) |
486 | return -EACCES; | |
487 | ||
488 | /* Control clients must be explicitly allowed */ | |
489 | if (unlikely(!(flags & DRM_CONTROL_ALLOW) && | |
490 | drm_is_control_client(file_priv))) | |
491 | return -EACCES; | |
492 | ||
493 | /* Render clients must be explicitly allowed */ | |
494 | if (unlikely(!(flags & DRM_RENDER_ALLOW) && | |
495 | drm_is_render_client(file_priv))) | |
496 | return -EACCES; | |
497 | ||
498 | return 0; | |
499 | } | |
5101020c | 500 | EXPORT_SYMBOL(drm_ioctl_permit); |
ec8f112d | 501 | |
066626d5 EV |
502 | #define DRM_IOCTL_DEF(ioctl, _func, _flags) \ |
503 | [DRM_IOCTL_NR(ioctl)] = { \ | |
504 | .cmd = ioctl, \ | |
505 | .func = _func, \ | |
506 | .flags = _flags, \ | |
507 | .name = #ioctl \ | |
508 | } | |
78238757 | 509 | |
0aaf20cf | 510 | /* Ioctl table */ |
78238757 | 511 | static const struct drm_ioctl_desc drm_ioctls[] = { |
30c64664 TH |
512 | DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, |
513 | DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW), | |
78238757 | 514 | DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0), |
94e86f5d | 515 | DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED), |
78238757 | 516 | DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), |
ec1f52ef | 517 | DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED), |
78238757 DV |
518 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED), |
519 | DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED), | |
520 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
521 | DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0), | |
522 | DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER), | |
523 | ||
46bfdf9a | 524 | DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
78238757 DV |
525 | DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
526 | DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
94e86f5d | 527 | DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER), |
78238757 DV |
528 | |
529 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
530 | DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), | |
531 | ||
532 | DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
533 | DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH), | |
534 | ||
ce833ba9 DV |
535 | DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), |
536 | DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), | |
78238757 DV |
537 | |
538 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), | |
539 | DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
540 | DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
541 | DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), | |
542 | DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
543 | DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
544 | DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH), | |
545 | ||
546 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
547 | DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
548 | ||
549 | DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), | |
550 | DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), | |
551 | ||
552 | DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), | |
553 | ||
554 | DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
555 | DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
556 | DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), | |
557 | DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), | |
558 | DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), | |
559 | DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), | |
560 | ||
561 | DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
562 | ||
a7fb8a23 | 563 | #if IS_ENABLED(CONFIG_AGP) |
78238757 DV |
564 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
565 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
566 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
567 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH), | |
568 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
569 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
570 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
571 | DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
572 | #endif | |
573 | ||
574 | DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
575 | DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
576 | ||
577 | DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED), | |
578 | ||
579 | DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0), | |
580 | ||
581 | DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), | |
582 | ||
583 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
584 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED), | |
585 | DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED), | |
586 | ||
587 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
588 | ||
589 | DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
590 | DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW), | |
591 | ||
592 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
593 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
594 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
595 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
596 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
597 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
598 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED), | |
599 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED), | |
600 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
601 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
602 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
603 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
604 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
605 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
606 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
607 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
608 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
609 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
610 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
611 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
612 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
613 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
614 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
615 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
616 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
617 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
618 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
d34f20d6 | 619 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
e2f5d2ea DS |
620 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
621 | DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), | |
78238757 DV |
622 | }; |
623 | ||
624 | #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) | |
625 | ||
ec8f112d | 626 | /** |
0aaf20cf DV |
627 | * drm_ioctl - ioctl callback implementation for DRM drivers |
628 | * @filp: file this ioctl is called on | |
629 | * @cmd: ioctl cmd number | |
630 | * @arg: user argument | |
ec8f112d DH |
631 | * |
632 | * Looks up the ioctl function in the ::ioctls table, checking for root | |
633 | * previleges if so required, and dispatches to the respective function. | |
0aaf20cf DV |
634 | * |
635 | * Returns: | |
636 | * Zero on success, negative error code on failure. | |
ec8f112d DH |
637 | */ |
638 | long drm_ioctl(struct file *filp, | |
639 | unsigned int cmd, unsigned long arg) | |
640 | { | |
641 | struct drm_file *file_priv = filp->private_data; | |
642 | struct drm_device *dev; | |
643 | const struct drm_ioctl_desc *ioctl = NULL; | |
644 | drm_ioctl_t *func; | |
645 | unsigned int nr = DRM_IOCTL_NR(cmd); | |
646 | int retcode = -EINVAL; | |
647 | char stack_kdata[128]; | |
648 | char *kdata = NULL; | |
83be0038 | 649 | unsigned int usize, asize, drv_size; |
ea487835 | 650 | bool is_driver_ioctl; |
ec8f112d DH |
651 | |
652 | dev = file_priv->minor->dev; | |
653 | ||
654 | if (drm_device_is_unplugged(dev)) | |
655 | return -ENODEV; | |
656 | ||
ea487835 DV |
657 | is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END; |
658 | ||
659 | if (is_driver_ioctl) { | |
83be0038 VS |
660 | /* driver ioctl */ |
661 | if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls) | |
662 | goto err_i1; | |
ec8f112d | 663 | ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE]; |
83be0038 VS |
664 | } else { |
665 | /* core ioctl */ | |
666 | if (nr >= DRM_CORE_IOCTL_COUNT) | |
667 | goto err_i1; | |
ec8f112d | 668 | ioctl = &drm_ioctls[nr]; |
83be0038 | 669 | } |
ec8f112d | 670 | |
83be0038 | 671 | drv_size = _IOC_SIZE(ioctl->cmd); |
53615af7 VS |
672 | usize = _IOC_SIZE(cmd); |
673 | asize = max(usize, drv_size); | |
83be0038 | 674 | cmd = ioctl->cmd; |
ec8f112d DH |
675 | |
676 | DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n", | |
677 | task_pid_nr(current), | |
678 | (long)old_encode_dev(file_priv->minor->kdev->devt), | |
679 | file_priv->authenticated, ioctl->name); | |
680 | ||
681 | /* Do not trust userspace, use our own definition */ | |
682 | func = ioctl->func; | |
683 | ||
684 | if (unlikely(!func)) { | |
685 | DRM_DEBUG("no function\n"); | |
686 | retcode = -EINVAL; | |
687 | goto err_i1; | |
688 | } | |
689 | ||
690 | retcode = drm_ioctl_permit(ioctl->flags, file_priv); | |
691 | if (unlikely(retcode)) | |
692 | goto err_i1; | |
693 | ||
694 | if (cmd & (IOC_IN | IOC_OUT)) { | |
695 | if (asize <= sizeof(stack_kdata)) { | |
696 | kdata = stack_kdata; | |
697 | } else { | |
698 | kdata = kmalloc(asize, GFP_KERNEL); | |
699 | if (!kdata) { | |
700 | retcode = -ENOMEM; | |
701 | goto err_i1; | |
702 | } | |
703 | } | |
704 | if (asize > usize) | |
705 | memset(kdata + usize, 0, asize - usize); | |
706 | } | |
707 | ||
708 | if (cmd & IOC_IN) { | |
709 | if (copy_from_user(kdata, (void __user *)arg, | |
710 | usize) != 0) { | |
711 | retcode = -EFAULT; | |
712 | goto err_i1; | |
713 | } | |
714 | } else if (cmd & IOC_OUT) { | |
715 | memset(kdata, 0, usize); | |
716 | } | |
717 | ||
ea487835 DV |
718 | /* Enforce sane locking for kms driver ioctls. Core ioctls are |
719 | * too messy still. */ | |
720 | if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) || | |
721 | (ioctl->flags & DRM_UNLOCKED)) | |
ec8f112d DH |
722 | retcode = func(dev, kdata, file_priv); |
723 | else { | |
724 | mutex_lock(&drm_global_mutex); | |
725 | retcode = func(dev, kdata, file_priv); | |
726 | mutex_unlock(&drm_global_mutex); | |
727 | } | |
728 | ||
729 | if (cmd & IOC_OUT) { | |
730 | if (copy_to_user((void __user *)arg, kdata, | |
731 | usize) != 0) | |
732 | retcode = -EFAULT; | |
733 | } | |
734 | ||
735 | err_i1: | |
736 | if (!ioctl) | |
737 | DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n", | |
738 | task_pid_nr(current), | |
739 | (long)old_encode_dev(file_priv->minor->kdev->devt), | |
740 | file_priv->authenticated, cmd, nr); | |
741 | ||
742 | if (kdata != stack_kdata) | |
743 | kfree(kdata); | |
744 | if (retcode) | |
745 | DRM_DEBUG("ret = %d\n", retcode); | |
746 | return retcode; | |
747 | } | |
748 | EXPORT_SYMBOL(drm_ioctl); | |
749 | ||
750 | /** | |
751 | * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags | |
0aaf20cf DV |
752 | * @nr: ioctl number |
753 | * @flags: where to return the ioctl permission flags | |
754 | * | |
755 | * This ioctl is only used by the vmwgfx driver to augment the access checks | |
756 | * done by the drm core and insofar a pretty decent layering violation. This | |
757 | * shouldn't be used by any drivers. | |
ec8f112d | 758 | * |
0aaf20cf DV |
759 | * Returns: |
760 | * True if the @nr corresponds to a DRM core ioctl numer, false otherwise. | |
ec8f112d DH |
761 | */ |
762 | bool drm_ioctl_flags(unsigned int nr, unsigned int *flags) | |
763 | { | |
7ef5f82b VS |
764 | if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END) |
765 | return false; | |
766 | ||
767 | if (nr >= DRM_CORE_IOCTL_COUNT) | |
768 | return false; | |
ec8f112d | 769 | |
7ef5f82b VS |
770 | *flags = drm_ioctls[nr].flags; |
771 | return true; | |
ec8f112d DH |
772 | } |
773 | EXPORT_SYMBOL(drm_ioctl_flags); |