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1/**
2 * \file drm_ioctl.c
3 * IOCTL processing for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include "drmP.h"
37#include "drm_core.h"
38
39#include "linux/pci.h"
40
41/**
42 * Get the bus id.
43 *
44 * \param inode device inode.
45 * \param file_priv DRM file private.
46 * \param cmd command.
47 * \param arg user argument, pointing to a drm_unique structure.
48 * \return zero on success or a negative number on failure.
49 *
50 * Copies the bus id from drm_device::unique into user space.
51 */
52int drm_getunique(struct drm_device *dev, void *data,
53 struct drm_file *file_priv)
54{
55 struct drm_unique *u = data;
56 struct drm_master *master = file_priv->master;
57
58 if (u->unique_len >= master->unique_len) {
59 if (copy_to_user(u->unique, master->unique, master->unique_len))
60 return -EFAULT;
61 }
62 u->unique_len = master->unique_len;
63
64 return 0;
65}
66
67static void
68drm_unset_busid(struct drm_device *dev,
69 struct drm_master *master)
70{
71 kfree(dev->devname);
72 dev->devname = NULL;
73
74 kfree(master->unique);
75 master->unique = NULL;
76 master->unique_len = 0;
77 master->unique_size = 0;
78}
79
80/**
81 * Set the bus id.
82 *
83 * \param inode device inode.
84 * \param file_priv DRM file private.
85 * \param cmd command.
86 * \param arg user argument, pointing to a drm_unique structure.
87 * \return zero on success or a negative number on failure.
88 *
89 * Copies the bus id from userspace into drm_device::unique, and verifies that
90 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
91 * in interface version 1.1 and will return EBUSY when setversion has requested
92 * version 1.1 or greater.
93 */
94int drm_setunique(struct drm_device *dev, void *data,
95 struct drm_file *file_priv)
96{
97 struct drm_unique *u = data;
98 struct drm_master *master = file_priv->master;
99 int ret;
100
101 if (master->unique_len || master->unique)
102 return -EBUSY;
103
104 if (!u->unique_len || u->unique_len > 1024)
105 return -EINVAL;
106
107 if (!dev->driver->bus->set_unique)
108 return -EINVAL;
109
110 ret = dev->driver->bus->set_unique(dev, master, u);
111 if (ret)
112 goto err;
113
114 return 0;
115
116err:
117 drm_unset_busid(dev, master);
118 return ret;
119}
120
121static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
122{
123 struct drm_master *master = file_priv->master;
124 int ret;
125
126 if (master->unique != NULL)
127 drm_unset_busid(dev, master);
128
129 ret = dev->driver->bus->set_busid(dev, master);
130 if (ret)
131 goto err;
132 return 0;
133err:
134 drm_unset_busid(dev, master);
135 return ret;
136}
137
138/**
139 * Get a mapping information.
140 *
141 * \param inode device inode.
142 * \param file_priv DRM file private.
143 * \param cmd command.
144 * \param arg user argument, pointing to a drm_map structure.
145 *
146 * \return zero on success or a negative number on failure.
147 *
148 * Searches for the mapping with the specified offset and copies its information
149 * into userspace
150 */
151int drm_getmap(struct drm_device *dev, void *data,
152 struct drm_file *file_priv)
153{
154 struct drm_map *map = data;
155 struct drm_map_list *r_list = NULL;
156 struct list_head *list;
157 int idx;
158 int i;
159
160 idx = map->offset;
161
162 mutex_lock(&dev->struct_mutex);
163 if (idx < 0) {
164 mutex_unlock(&dev->struct_mutex);
165 return -EINVAL;
166 }
167
168 i = 0;
169 list_for_each(list, &dev->maplist) {
170 if (i == idx) {
171 r_list = list_entry(list, struct drm_map_list, head);
172 break;
173 }
174 i++;
175 }
176 if (!r_list || !r_list->map) {
177 mutex_unlock(&dev->struct_mutex);
178 return -EINVAL;
179 }
180
181 map->offset = r_list->map->offset;
182 map->size = r_list->map->size;
183 map->type = r_list->map->type;
184 map->flags = r_list->map->flags;
185 map->handle = (void *)(unsigned long) r_list->user_token;
186 map->mtrr = r_list->map->mtrr;
187 mutex_unlock(&dev->struct_mutex);
188
189 return 0;
190}
191
192/**
193 * Get client information.
194 *
195 * \param inode device inode.
196 * \param file_priv DRM file private.
197 * \param cmd command.
198 * \param arg user argument, pointing to a drm_client structure.
199 *
200 * \return zero on success or a negative number on failure.
201 *
202 * Searches for the client with the specified index and copies its information
203 * into userspace
204 */
205int drm_getclient(struct drm_device *dev, void *data,
206 struct drm_file *file_priv)
207{
208 struct drm_client *client = data;
209 struct drm_file *pt;
210 int idx;
211 int i;
212
213 idx = client->idx;
214 mutex_lock(&dev->struct_mutex);
215
216 i = 0;
217 list_for_each_entry(pt, &dev->filelist, lhead) {
218 if (i++ >= idx) {
219 client->auth = pt->authenticated;
220 client->pid = pt->pid;
221 client->uid = pt->uid;
222 client->magic = pt->magic;
223 client->iocs = pt->ioctl_count;
224 mutex_unlock(&dev->struct_mutex);
225
226 return 0;
227 }
228 }
229 mutex_unlock(&dev->struct_mutex);
230
231 return -EINVAL;
232}
233
234/**
235 * Get statistics information.
236 *
237 * \param inode device inode.
238 * \param file_priv DRM file private.
239 * \param cmd command.
240 * \param arg user argument, pointing to a drm_stats structure.
241 *
242 * \return zero on success or a negative number on failure.
243 */
244int drm_getstats(struct drm_device *dev, void *data,
245 struct drm_file *file_priv)
246{
247 struct drm_stats *stats = data;
248 int i;
249
250 memset(stats, 0, sizeof(*stats));
251
252 mutex_lock(&dev->struct_mutex);
253
254 for (i = 0; i < dev->counters; i++) {
255 if (dev->types[i] == _DRM_STAT_LOCK)
256 stats->data[i].value =
257 (file_priv->master->lock.hw_lock ? file_priv->master->lock.hw_lock->lock : 0);
258 else
259 stats->data[i].value = atomic_read(&dev->counts[i]);
260 stats->data[i].type = dev->types[i];
261 }
262
263 stats->count = dev->counters;
264
265 mutex_unlock(&dev->struct_mutex);
266
267 return 0;
268}
269
270/**
271 * Get device/driver capabilities
272 */
273int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
274{
275 struct drm_get_cap *req = data;
276
277 req->value = 0;
278 switch (req->capability) {
279 case DRM_CAP_DUMB_BUFFER:
280 if (dev->driver->dumb_create)
281 req->value = 1;
282 break;
283 case DRM_CAP_VBLANK_HIGH_CRTC:
284 req->value = 1;
285 break;
286 default:
287 return -EINVAL;
288 }
289 return 0;
290}
291
292/**
293 * Setversion ioctl.
294 *
295 * \param inode device inode.
296 * \param file_priv DRM file private.
297 * \param cmd command.
298 * \param arg user argument, pointing to a drm_lock structure.
299 * \return zero on success or negative number on failure.
300 *
301 * Sets the requested interface version
302 */
303int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
304{
305 struct drm_set_version *sv = data;
306 int if_version, retcode = 0;
307
308 if (sv->drm_di_major != -1) {
309 if (sv->drm_di_major != DRM_IF_MAJOR ||
310 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
311 retcode = -EINVAL;
312 goto done;
313 }
314 if_version = DRM_IF_VERSION(sv->drm_di_major,
315 sv->drm_di_minor);
316 dev->if_version = max(if_version, dev->if_version);
317 if (sv->drm_di_minor >= 1) {
318 /*
319 * Version 1.1 includes tying of DRM to specific device
320 * Version 1.4 has proper PCI domain support
321 */
322 retcode = drm_set_busid(dev, file_priv);
323 if (retcode)
324 goto done;
325 }
326 }
327
328 if (sv->drm_dd_major != -1) {
329 if (sv->drm_dd_major != dev->driver->major ||
330 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
331 dev->driver->minor) {
332 retcode = -EINVAL;
333 goto done;
334 }
335
336 if (dev->driver->set_version)
337 dev->driver->set_version(dev, sv);
338 }
339
340done:
341 sv->drm_di_major = DRM_IF_MAJOR;
342 sv->drm_di_minor = DRM_IF_MINOR;
343 sv->drm_dd_major = dev->driver->major;
344 sv->drm_dd_minor = dev->driver->minor;
345
346 return retcode;
347}
348
349/** No-op ioctl. */
350int drm_noop(struct drm_device *dev, void *data,
351 struct drm_file *file_priv)
352{
353 DRM_DEBUG("\n");
354 return 0;
355}
1/**
2 * \file drm_ioctl.c
3 * IOCTL processing for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
11 *
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
15 *
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
22 *
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
25 * Software.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
34 */
35
36#include <drm/drmP.h>
37#include <drm/drm_core.h>
38
39#include <linux/pci.h>
40#include <linux/export.h>
41#ifdef CONFIG_X86
42#include <asm/mtrr.h>
43#endif
44
45/**
46 * Get the bus id.
47 *
48 * \param inode device inode.
49 * \param file_priv DRM file private.
50 * \param cmd command.
51 * \param arg user argument, pointing to a drm_unique structure.
52 * \return zero on success or a negative number on failure.
53 *
54 * Copies the bus id from drm_device::unique into user space.
55 */
56int drm_getunique(struct drm_device *dev, void *data,
57 struct drm_file *file_priv)
58{
59 struct drm_unique *u = data;
60 struct drm_master *master = file_priv->master;
61
62 if (u->unique_len >= master->unique_len) {
63 if (copy_to_user(u->unique, master->unique, master->unique_len))
64 return -EFAULT;
65 }
66 u->unique_len = master->unique_len;
67
68 return 0;
69}
70
71static void
72drm_unset_busid(struct drm_device *dev,
73 struct drm_master *master)
74{
75 kfree(dev->devname);
76 dev->devname = NULL;
77
78 kfree(master->unique);
79 master->unique = NULL;
80 master->unique_len = 0;
81 master->unique_size = 0;
82}
83
84/**
85 * Set the bus id.
86 *
87 * \param inode device inode.
88 * \param file_priv DRM file private.
89 * \param cmd command.
90 * \param arg user argument, pointing to a drm_unique structure.
91 * \return zero on success or a negative number on failure.
92 *
93 * Copies the bus id from userspace into drm_device::unique, and verifies that
94 * it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
95 * in interface version 1.1 and will return EBUSY when setversion has requested
96 * version 1.1 or greater.
97 */
98int drm_setunique(struct drm_device *dev, void *data,
99 struct drm_file *file_priv)
100{
101 struct drm_unique *u = data;
102 struct drm_master *master = file_priv->master;
103 int ret;
104
105 if (master->unique_len || master->unique)
106 return -EBUSY;
107
108 if (!u->unique_len || u->unique_len > 1024)
109 return -EINVAL;
110
111 if (!dev->driver->bus->set_unique)
112 return -EINVAL;
113
114 ret = dev->driver->bus->set_unique(dev, master, u);
115 if (ret)
116 goto err;
117
118 return 0;
119
120err:
121 drm_unset_busid(dev, master);
122 return ret;
123}
124
125static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
126{
127 struct drm_master *master = file_priv->master;
128 int ret;
129
130 if (master->unique != NULL)
131 drm_unset_busid(dev, master);
132
133 ret = dev->driver->bus->set_busid(dev, master);
134 if (ret)
135 goto err;
136 return 0;
137err:
138 drm_unset_busid(dev, master);
139 return ret;
140}
141
142/**
143 * Get a mapping information.
144 *
145 * \param inode device inode.
146 * \param file_priv DRM file private.
147 * \param cmd command.
148 * \param arg user argument, pointing to a drm_map structure.
149 *
150 * \return zero on success or a negative number on failure.
151 *
152 * Searches for the mapping with the specified offset and copies its information
153 * into userspace
154 */
155int drm_getmap(struct drm_device *dev, void *data,
156 struct drm_file *file_priv)
157{
158 struct drm_map *map = data;
159 struct drm_map_list *r_list = NULL;
160 struct list_head *list;
161 int idx;
162 int i;
163
164 idx = map->offset;
165 if (idx < 0)
166 return -EINVAL;
167
168 i = 0;
169 mutex_lock(&dev->struct_mutex);
170 list_for_each(list, &dev->maplist) {
171 if (i == idx) {
172 r_list = list_entry(list, struct drm_map_list, head);
173 break;
174 }
175 i++;
176 }
177 if (!r_list || !r_list->map) {
178 mutex_unlock(&dev->struct_mutex);
179 return -EINVAL;
180 }
181
182 map->offset = r_list->map->offset;
183 map->size = r_list->map->size;
184 map->type = r_list->map->type;
185 map->flags = r_list->map->flags;
186 map->handle = (void *)(unsigned long) r_list->user_token;
187
188#ifdef CONFIG_X86
189 /*
190 * There appears to be exactly one user of the mtrr index: dritest.
191 * It's easy enough to keep it working on non-PAT systems.
192 */
193 map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
194#else
195 map->mtrr = -1;
196#endif
197
198 mutex_unlock(&dev->struct_mutex);
199
200 return 0;
201}
202
203/**
204 * Get client information.
205 *
206 * \param inode device inode.
207 * \param file_priv DRM file private.
208 * \param cmd command.
209 * \param arg user argument, pointing to a drm_client structure.
210 *
211 * \return zero on success or a negative number on failure.
212 *
213 * Searches for the client with the specified index and copies its information
214 * into userspace
215 */
216int drm_getclient(struct drm_device *dev, void *data,
217 struct drm_file *file_priv)
218{
219 struct drm_client *client = data;
220
221 /*
222 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
223 * not breaking completely. Userspace tools stop enumerating one they
224 * get -EINVAL, hence this is the return value we need to hand back for
225 * no clients tracked.
226 *
227 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
228 * attempt to figure out whether they're authenticated or not. Since
229 * that's the only thing they care about, give it to the directly
230 * instead of walking one giant list.
231 */
232 if (client->idx == 0) {
233 client->auth = file_priv->authenticated;
234 client->pid = pid_vnr(file_priv->pid);
235 client->uid = from_kuid_munged(current_user_ns(),
236 file_priv->uid);
237 client->magic = 0;
238 client->iocs = 0;
239
240 return 0;
241 } else {
242 return -EINVAL;
243 }
244}
245
246/**
247 * Get statistics information.
248 *
249 * \param inode device inode.
250 * \param file_priv DRM file private.
251 * \param cmd command.
252 * \param arg user argument, pointing to a drm_stats structure.
253 *
254 * \return zero on success or a negative number on failure.
255 */
256int drm_getstats(struct drm_device *dev, void *data,
257 struct drm_file *file_priv)
258{
259 struct drm_stats *stats = data;
260
261 /* Clear stats to prevent userspace from eating its stack garbage. */
262 memset(stats, 0, sizeof(*stats));
263
264 return 0;
265}
266
267/**
268 * Get device/driver capabilities
269 */
270int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
271{
272 struct drm_get_cap *req = data;
273
274 req->value = 0;
275 switch (req->capability) {
276 case DRM_CAP_DUMB_BUFFER:
277 if (dev->driver->dumb_create)
278 req->value = 1;
279 break;
280 case DRM_CAP_VBLANK_HIGH_CRTC:
281 req->value = 1;
282 break;
283 case DRM_CAP_DUMB_PREFERRED_DEPTH:
284 req->value = dev->mode_config.preferred_depth;
285 break;
286 case DRM_CAP_DUMB_PREFER_SHADOW:
287 req->value = dev->mode_config.prefer_shadow;
288 break;
289 case DRM_CAP_PRIME:
290 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
291 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
292 break;
293 case DRM_CAP_TIMESTAMP_MONOTONIC:
294 req->value = drm_timestamp_monotonic;
295 break;
296 case DRM_CAP_ASYNC_PAGE_FLIP:
297 req->value = dev->mode_config.async_page_flip;
298 break;
299 case DRM_CAP_CURSOR_WIDTH:
300 if (dev->mode_config.cursor_width)
301 req->value = dev->mode_config.cursor_width;
302 else
303 req->value = 64;
304 break;
305 case DRM_CAP_CURSOR_HEIGHT:
306 if (dev->mode_config.cursor_height)
307 req->value = dev->mode_config.cursor_height;
308 else
309 req->value = 64;
310 break;
311 default:
312 return -EINVAL;
313 }
314 return 0;
315}
316
317/**
318 * Set device/driver capabilities
319 */
320int
321drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
322{
323 struct drm_set_client_cap *req = data;
324
325 switch (req->capability) {
326 case DRM_CLIENT_CAP_STEREO_3D:
327 if (req->value > 1)
328 return -EINVAL;
329 file_priv->stereo_allowed = req->value;
330 break;
331 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
332 if (!drm_universal_planes)
333 return -EINVAL;
334 if (req->value > 1)
335 return -EINVAL;
336 file_priv->universal_planes = req->value;
337 break;
338 default:
339 return -EINVAL;
340 }
341
342 return 0;
343}
344
345/**
346 * Setversion ioctl.
347 *
348 * \param inode device inode.
349 * \param file_priv DRM file private.
350 * \param cmd command.
351 * \param arg user argument, pointing to a drm_lock structure.
352 * \return zero on success or negative number on failure.
353 *
354 * Sets the requested interface version
355 */
356int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
357{
358 struct drm_set_version *sv = data;
359 int if_version, retcode = 0;
360
361 if (sv->drm_di_major != -1) {
362 if (sv->drm_di_major != DRM_IF_MAJOR ||
363 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
364 retcode = -EINVAL;
365 goto done;
366 }
367 if_version = DRM_IF_VERSION(sv->drm_di_major,
368 sv->drm_di_minor);
369 dev->if_version = max(if_version, dev->if_version);
370 if (sv->drm_di_minor >= 1) {
371 /*
372 * Version 1.1 includes tying of DRM to specific device
373 * Version 1.4 has proper PCI domain support
374 */
375 retcode = drm_set_busid(dev, file_priv);
376 if (retcode)
377 goto done;
378 }
379 }
380
381 if (sv->drm_dd_major != -1) {
382 if (sv->drm_dd_major != dev->driver->major ||
383 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
384 dev->driver->minor) {
385 retcode = -EINVAL;
386 goto done;
387 }
388 }
389
390done:
391 sv->drm_di_major = DRM_IF_MAJOR;
392 sv->drm_di_minor = DRM_IF_MINOR;
393 sv->drm_dd_major = dev->driver->major;
394 sv->drm_dd_minor = dev->driver->minor;
395
396 return retcode;
397}
398
399/** No-op ioctl. */
400int drm_noop(struct drm_device *dev, void *data,
401 struct drm_file *file_priv)
402{
403 DRM_DEBUG("\n");
404 return 0;
405}
406EXPORT_SYMBOL(drm_noop);