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drm: kill BKL from common code
[linux-2.6/next.git] / drivers / gpu / drm / drm_drv.c
blob90288ec7c28420133d0deea13e3ba2f1f98d413c
1 /**
2 * \file drm_drv.c
3 * Generic driver template
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 *
8 * To use this template, you must at least define the following (samples
9 * given for the MGA driver):
10 *
11 * \code
12 * #define DRIVER_AUTHOR "VA Linux Systems, Inc."
13 *
14 * #define DRIVER_NAME "mga"
15 * #define DRIVER_DESC "Matrox G200/G400"
16 * #define DRIVER_DATE "20001127"
17 *
18 * #define drm_x mga_##x
19 * \endcode
20 */
21
22 /*
23 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
24 *
25 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
26 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
27 * All Rights Reserved.
28 *
29 * Permission is hereby granted, free of charge, to any person obtaining a
30 * copy of this software and associated documentation files (the "Software"),
31 * to deal in the Software without restriction, including without limitation
32 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
33 * and/or sell copies of the Software, and to permit persons to whom the
34 * Software is furnished to do so, subject to the following conditions:
35 *
36 * The above copyright notice and this permission notice (including the next
37 * paragraph) shall be included in all copies or substantial portions of the
38 * Software.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
41 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
42 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
43 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
44 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
46 * OTHER DEALINGS IN THE SOFTWARE.
47 */
48
49 #include <linux/debugfs.h>
50 #include <linux/slab.h>
51 #include "drmP.h"
52 #include "drm_core.h"
53
54
55 static int drm_version(struct drm_device *dev, void *data,
56 struct drm_file *file_priv);
57
58 /** Ioctl table */
59 static struct drm_ioctl_desc drm_ioctls[] = {
60 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
61 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
62 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
63 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
64 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
65 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
66 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
67 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
68
69 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
70 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
71 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
72 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
73
74 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
75 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
76
77 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
78 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
79
80 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
81 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
82
83 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
84 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
85 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
86 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
87 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
88 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
89 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
90
91 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
92 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
93
94 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
95 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
96
97 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
98
99 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
100 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
101 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
102 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
103 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
104 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
105 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
106
107 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
108
109 #if __OS_HAS_AGP
110 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
111 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
112 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
113 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
114 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
117 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
118 #endif
119
120 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
121 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
122
123 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),
124
125 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
126
127 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
128
129 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
130 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
131 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
132
133 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
134 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
135 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
136 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
137 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED),
138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED),
144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED)
151 };
152
153 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
154
155 /**
156 * Take down the DRM device.
157 *
158 * \param dev DRM device structure.
159 *
160 * Frees every resource in \p dev.
161 *
162 * \sa drm_device
163 */
164 int drm_lastclose(struct drm_device * dev)
165 {
166 struct drm_vma_entry *vma, *vma_temp;
167 int i;
168
169 DRM_DEBUG("\n");
170
171 if (dev->driver->lastclose)
172 dev->driver->lastclose(dev);
173 DRM_DEBUG("driver lastclose completed\n");
174
175 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
176 drm_irq_uninstall(dev);
177
178 mutex_lock(&dev->struct_mutex);
179
180 /* Free drawable information memory */
181 drm_drawable_free_all(dev);
182 del_timer(&dev->timer);
183
184 /* Clear AGP information */
185 if (drm_core_has_AGP(dev) && dev->agp &&
186 !drm_core_check_feature(dev, DRIVER_MODESET)) {
187 struct drm_agp_mem *entry, *tempe;
188
189 /* Remove AGP resources, but leave dev->agp
190 intact until drv_cleanup is called. */
191 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
192 if (entry->bound)
193 drm_unbind_agp(entry->memory);
194 drm_free_agp(entry->memory, entry->pages);
195 kfree(entry);
196 }
197 INIT_LIST_HEAD(&dev->agp->memory);
198
199 if (dev->agp->acquired)
200 drm_agp_release(dev);
201
202 dev->agp->acquired = 0;
203 dev->agp->enabled = 0;
204 }
205 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
206 !drm_core_check_feature(dev, DRIVER_MODESET)) {
207 drm_sg_cleanup(dev->sg);
208 dev->sg = NULL;
209 }
210
211 /* Clear vma list (only built for debugging) */
212 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
213 list_del(&vma->head);
214 kfree(vma);
215 }
216
217 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
218 for (i = 0; i < dev->queue_count; i++) {
219 kfree(dev->queuelist[i]);
220 dev->queuelist[i] = NULL;
221 }
222 kfree(dev->queuelist);
223 dev->queuelist = NULL;
224 }
225 dev->queue_count = 0;
226
227 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
228 !drm_core_check_feature(dev, DRIVER_MODESET))
229 drm_dma_takedown(dev);
230
231 dev->dev_mapping = NULL;
232 mutex_unlock(&dev->struct_mutex);
233
234 DRM_DEBUG("lastclose completed\n");
235 return 0;
236 }
237
238 /**
239 * Module initialization. Called via init_module at module load time, or via
240 * linux/init/main.c (this is not currently supported).
241 *
242 * \return zero on success or a negative number on failure.
243 *
244 * Initializes an array of drm_device structures, and attempts to
245 * initialize all available devices, using consecutive minors, registering the
246 * stubs and initializing the device.
247 *
248 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
249 * after the initialization for driver customization.
250 */
251 int drm_init(struct drm_driver *driver)
252 {
253 DRM_DEBUG("\n");
254 INIT_LIST_HEAD(&driver->device_list);
255
256 if (driver->driver_features & DRIVER_USE_PLATFORM_DEVICE)
257 return drm_platform_init(driver);
258 else
259 return drm_pci_init(driver);
260 }
261
262 EXPORT_SYMBOL(drm_init);
263
264 void drm_exit(struct drm_driver *driver)
265 {
266 struct drm_device *dev, *tmp;
267 DRM_DEBUG("\n");
268
269 if (driver->driver_features & DRIVER_MODESET) {
270 pci_unregister_driver(&driver->pci_driver);
271 } else {
272 list_for_each_entry_safe(dev, tmp, &driver->device_list, driver_item)
273 drm_put_dev(dev);
274 }
275
276 DRM_INFO("Module unloaded\n");
277 }
278
279 EXPORT_SYMBOL(drm_exit);
280
281 /** File operations structure */
282 static const struct file_operations drm_stub_fops = {
283 .owner = THIS_MODULE,
284 .open = drm_stub_open
285 };
286
287 static int __init drm_core_init(void)
288 {
289 int ret = -ENOMEM;
290
291 drm_global_init();
292 idr_init(&drm_minors_idr);
293
294 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
295 goto err_p1;
296
297 drm_class = drm_sysfs_create(THIS_MODULE, "drm");
298 if (IS_ERR(drm_class)) {
299 printk(KERN_ERR "DRM: Error creating drm class.\n");
300 ret = PTR_ERR(drm_class);
301 goto err_p2;
302 }
303
304 drm_proc_root = proc_mkdir("dri", NULL);
305 if (!drm_proc_root) {
306 DRM_ERROR("Cannot create /proc/dri\n");
307 ret = -1;
308 goto err_p3;
309 }
310
311 drm_debugfs_root = debugfs_create_dir("dri", NULL);
312 if (!drm_debugfs_root) {
313 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
314 ret = -1;
315 goto err_p3;
316 }
317
318 DRM_INFO("Initialized %s %d.%d.%d %s\n",
319 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
320 return 0;
321 err_p3:
322 drm_sysfs_destroy();
323 err_p2:
324 unregister_chrdev(DRM_MAJOR, "drm");
325
326 idr_destroy(&drm_minors_idr);
327 err_p1:
328 return ret;
329 }
330
331 static void __exit drm_core_exit(void)
332 {
333 remove_proc_entry("dri", NULL);
334 debugfs_remove(drm_debugfs_root);
335 drm_sysfs_destroy();
336
337 unregister_chrdev(DRM_MAJOR, "drm");
338
339 idr_remove_all(&drm_minors_idr);
340 idr_destroy(&drm_minors_idr);
341 }
342
343 module_init(drm_core_init);
344 module_exit(drm_core_exit);
345
346 /**
347 * Copy and IOCTL return string to user space
348 */
349 static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
350 {
351 int len;
352
353 /* don't overflow userbuf */
354 len = strlen(value);
355 if (len > *buf_len)
356 len = *buf_len;
357
358 /* let userspace know exact length of driver value (which could be
359 * larger than the userspace-supplied buffer) */
360 *buf_len = strlen(value);
361
362 /* finally, try filling in the userbuf */
363 if (len && buf)
364 if (copy_to_user(buf, value, len))
365 return -EFAULT;
366 return 0;
367 }
368
369 /**
370 * Get version information
371 *
372 * \param inode device inode.
373 * \param filp file pointer.
374 * \param cmd command.
375 * \param arg user argument, pointing to a drm_version structure.
376 * \return zero on success or negative number on failure.
377 *
378 * Fills in the version information in \p arg.
379 */
380 static int drm_version(struct drm_device *dev, void *data,
381 struct drm_file *file_priv)
382 {
383 struct drm_version *version = data;
384 int err;
385
386 version->version_major = dev->driver->major;
387 version->version_minor = dev->driver->minor;
388 version->version_patchlevel = dev->driver->patchlevel;
389 err = drm_copy_field(version->name, &version->name_len,
390 dev->driver->name);
391 if (!err)
392 err = drm_copy_field(version->date, &version->date_len,
393 dev->driver->date);
394 if (!err)
395 err = drm_copy_field(version->desc, &version->desc_len,
396 dev->driver->desc);
397
398 return err;
399 }
400
401 /**
402 * Called whenever a process performs an ioctl on /dev/drm.
403 *
404 * \param inode device inode.
405 * \param file_priv DRM file private.
406 * \param cmd command.
407 * \param arg user argument.
408 * \return zero on success or negative number on failure.
409 *
410 * Looks up the ioctl function in the ::ioctls table, checking for root
411 * previleges if so required, and dispatches to the respective function.
412 */
413 long drm_ioctl(struct file *filp,
414 unsigned int cmd, unsigned long arg)
415 {
416 struct drm_file *file_priv = filp->private_data;
417 struct drm_device *dev;
418 struct drm_ioctl_desc *ioctl;
419 drm_ioctl_t *func;
420 unsigned int nr = DRM_IOCTL_NR(cmd);
421 int retcode = -EINVAL;
422 char stack_kdata[128];
423 char *kdata = NULL;
424
425 dev = file_priv->minor->dev;
426 atomic_inc(&dev->ioctl_count);
427 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
428 ++file_priv->ioctl_count;
429
430 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
431 task_pid_nr(current), cmd, nr,
432 (long)old_encode_dev(file_priv->minor->device),
433 file_priv->authenticated);
434
435 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
436 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
437 goto err_i1;
438 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
439 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
440 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
441 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
442 ioctl = &drm_ioctls[nr];
443 cmd = ioctl->cmd;
444 } else
445 goto err_i1;
446
447 /* Do not trust userspace, use our own definition */
448 func = ioctl->func;
449 /* is there a local override? */
450 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
451 func = dev->driver->dma_ioctl;
452
453 if (!func) {
454 DRM_DEBUG("no function\n");
455 retcode = -EINVAL;
456 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
457 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
458 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
459 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
460 retcode = -EACCES;
461 } else {
462 if (cmd & (IOC_IN | IOC_OUT)) {
463 if (_IOC_SIZE(cmd) <= sizeof(stack_kdata)) {
464 kdata = stack_kdata;
465 } else {
466 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
467 if (!kdata) {
468 retcode = -ENOMEM;
469 goto err_i1;
470 }
471 }
472 }
473
474 if (cmd & IOC_IN) {
475 if (copy_from_user(kdata, (void __user *)arg,
476 _IOC_SIZE(cmd)) != 0) {
477 retcode = -EFAULT;
478 goto err_i1;
479 }
480 }
481 if (ioctl->flags & DRM_UNLOCKED)
482 retcode = func(dev, kdata, file_priv);
483 else {
484 mutex_lock(&drm_global_mutex);
485 retcode = func(dev, kdata, file_priv);
486 mutex_unlock(&drm_global_mutex);
487 }
488
489 if (cmd & IOC_OUT) {
490 if (copy_to_user((void __user *)arg, kdata,
491 _IOC_SIZE(cmd)) != 0)
492 retcode = -EFAULT;
493 }
494 }
495
496 err_i1:
497 if (kdata != stack_kdata)
498 kfree(kdata);
499 atomic_dec(&dev->ioctl_count);
500 if (retcode)
501 DRM_DEBUG("ret = %x\n", retcode);
502 return retcode;
503 }
504
505 EXPORT_SYMBOL(drm_ioctl);
506
507 struct drm_local_map *drm_getsarea(struct drm_device *dev)
508 {
509 struct drm_map_list *entry;
510
511 list_for_each_entry(entry, &dev->maplist, head) {
512 if (entry->map && entry->map->type == _DRM_SHM &&
513 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
514 return entry->map;
515 }
516 }
517 return NULL;
518 }
519 EXPORT_SYMBOL(drm_getsarea);
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