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pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / char / drm / drm_drv.c
blob72668b15e5ce2a5a8db7aedce9b73691762a8f05
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 "drmP.h"
50 #include "drm_core.h"
51
52 static int drm_version(struct drm_device *dev, void *data,
53 struct drm_file *file_priv);
54
55 /** Ioctl table */
56 static struct drm_ioctl_desc drm_ioctls[] = {
57 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
58 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
59 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
60 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
61 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
62 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
63 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
64 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER|DRM_ROOT_ONLY),
65
66 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
67 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
68 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
69 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
70
71 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
72 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
73
74 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
75 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
76
77 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
78 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
79 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
80 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
81 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
82 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
83 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
84
85 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
86 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
87
88 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
89 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
90
91 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
92
93 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
94 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
95 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
96 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
97 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
98 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
99 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
100
101 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
102
103 #if __OS_HAS_AGP
104 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
105 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
106 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
107 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
108 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
109 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
110 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
111 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
112 #endif
113
114 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
115 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
116
117 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),
118
119 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
120 };
121
122 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
123
124 /**
125 * Take down the DRM device.
126 *
127 * \param dev DRM device structure.
128 *
129 * Frees every resource in \p dev.
130 *
131 * \sa drm_device
132 */
133 int drm_lastclose(struct drm_device * dev)
134 {
135 struct drm_magic_entry *pt, *next;
136 struct drm_map_list *r_list, *list_t;
137 struct drm_vma_entry *vma, *vma_temp;
138 int i;
139
140 DRM_DEBUG("\n");
141
142 if (dev->driver->lastclose)
143 dev->driver->lastclose(dev);
144 DRM_DEBUG("driver lastclose completed\n");
145
146 if (dev->unique) {
147 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
148 dev->unique = NULL;
149 dev->unique_len = 0;
150 }
151
152 if (dev->irq_enabled)
153 drm_irq_uninstall(dev);
154
155 mutex_lock(&dev->struct_mutex);
156
157 /* Free drawable information memory */
158 drm_drawable_free_all(dev);
159 del_timer(&dev->timer);
160
161 /* Clear pid list */
162 if (dev->magicfree.next) {
163 list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
164 list_del(&pt->head);
165 drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
166 drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
167 }
168 drm_ht_remove(&dev->magiclist);
169 }
170
171 /* Clear AGP information */
172 if (drm_core_has_AGP(dev) && dev->agp) {
173 struct drm_agp_mem *entry, *tempe;
174
175 /* Remove AGP resources, but leave dev->agp
176 intact until drv_cleanup is called. */
177 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
178 if (entry->bound)
179 drm_unbind_agp(entry->memory);
180 drm_free_agp(entry->memory, entry->pages);
181 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
182 }
183 INIT_LIST_HEAD(&dev->agp->memory);
184
185 if (dev->agp->acquired)
186 drm_agp_release(dev);
187
188 dev->agp->acquired = 0;
189 dev->agp->enabled = 0;
190 }
191 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
192 drm_sg_cleanup(dev->sg);
193 dev->sg = NULL;
194 }
195
196 /* Clear vma list (only built for debugging) */
197 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
198 list_del(&vma->head);
199 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
200 }
201
202 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
203 drm_rmmap_locked(dev, r_list->map);
204 r_list = NULL;
205 }
206
207 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
208 for (i = 0; i < dev->queue_count; i++) {
209 if (dev->queuelist[i]) {
210 drm_free(dev->queuelist[i],
211 sizeof(*dev->queuelist[0]),
212 DRM_MEM_QUEUES);
213 dev->queuelist[i] = NULL;
214 }
215 }
216 drm_free(dev->queuelist,
217 dev->queue_slots * sizeof(*dev->queuelist),
218 DRM_MEM_QUEUES);
219 dev->queuelist = NULL;
220 }
221 dev->queue_count = 0;
222
223 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
224 drm_dma_takedown(dev);
225
226 if (dev->lock.hw_lock) {
227 dev->sigdata.lock = dev->lock.hw_lock = NULL; /* SHM removed */
228 dev->lock.file_priv = NULL;
229 wake_up_interruptible(&dev->lock.lock_queue);
230 }
231 mutex_unlock(&dev->struct_mutex);
232
233 DRM_DEBUG("lastclose completed\n");
234 return 0;
235 }
236
237 /**
238 * Module initialization. Called via init_module at module load time, or via
239 * linux/init/main.c (this is not currently supported).
240 *
241 * \return zero on success or a negative number on failure.
242 *
243 * Initializes an array of drm_device structures, and attempts to
244 * initialize all available devices, using consecutive minors, registering the
245 * stubs and initializing the AGP device.
246 *
247 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
248 * after the initialization for driver customization.
249 */
250 int drm_init(struct drm_driver *driver)
251 {
252 struct pci_dev *pdev = NULL;
253 struct pci_device_id *pid;
254 int i;
255
256 DRM_DEBUG("\n");
257
258 drm_mem_init();
259
260 for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
261 pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];
262
263 pdev = NULL;
264 /* pass back in pdev to account for multiple identical cards */
265 while ((pdev =
266 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
267 pid->subdevice, pdev)) != NULL) {
268 /* stealth mode requires a manual probe */
269 pci_dev_get(pdev);
270 drm_get_dev(pdev, pid, driver);
271 }
272 }
273 return 0;
274 }
275
276 EXPORT_SYMBOL(drm_init);
277
278 /**
279 * Called via cleanup_module() at module unload time.
280 *
281 * Cleans up all DRM device, calling drm_lastclose().
282 *
283 * \sa drm_init
284 */
285 static void drm_cleanup(struct drm_device * dev)
286 {
287 DRM_DEBUG("\n");
288
289 if (!dev) {
290 DRM_ERROR("cleanup called no dev\n");
291 return;
292 }
293
294 drm_lastclose(dev);
295
296 drm_ht_remove(&dev->map_hash);
297
298 drm_ctxbitmap_cleanup(dev);
299
300 if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
301 dev->agp && dev->agp->agp_mtrr >= 0) {
302 int retval;
303 retval = mtrr_del(dev->agp->agp_mtrr,
304 dev->agp->agp_info.aper_base,
305 dev->agp->agp_info.aper_size * 1024 * 1024);
306 DRM_DEBUG("mtrr_del=%d\n", retval);
307 }
308
309 if (drm_core_has_AGP(dev) && dev->agp) {
310 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
311 dev->agp = NULL;
312 }
313
314 if (dev->driver->unload)
315 dev->driver->unload(dev);
316
317 drm_put_head(&dev->primary);
318 if (drm_put_dev(dev))
319 DRM_ERROR("Cannot unload module\n");
320 }
321
322 void drm_exit(struct drm_driver *driver)
323 {
324 int i;
325 struct drm_device *dev = NULL;
326 struct drm_head *head;
327
328 DRM_DEBUG("\n");
329
330 for (i = 0; i < drm_cards_limit; i++) {
331 head = drm_heads[i];
332 if (!head)
333 continue;
334 if (!head->dev)
335 continue;
336 if (head->dev->driver != driver)
337 continue;
338 dev = head->dev;
339 if (dev) {
340 /* release the pci driver */
341 if (dev->pdev)
342 pci_dev_put(dev->pdev);
343 drm_cleanup(dev);
344 }
345 }
346 DRM_INFO("Module unloaded\n");
347 }
348
349 EXPORT_SYMBOL(drm_exit);
350
351 /** File operations structure */
352 static const struct file_operations drm_stub_fops = {
353 .owner = THIS_MODULE,
354 .open = drm_stub_open
355 };
356
357 static int __init drm_core_init(void)
358 {
359 int ret = -ENOMEM;
360
361 drm_cards_limit =
362 (drm_cards_limit <
363 DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
364 drm_heads =
365 drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
366 if (!drm_heads)
367 goto err_p1;
368
369 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
370 goto err_p1;
371
372 drm_class = drm_sysfs_create(THIS_MODULE, "drm");
373 if (IS_ERR(drm_class)) {
374 printk(KERN_ERR "DRM: Error creating drm class.\n");
375 ret = PTR_ERR(drm_class);
376 goto err_p2;
377 }
378
379 drm_proc_root = proc_mkdir("dri", NULL);
380 if (!drm_proc_root) {
381 DRM_ERROR("Cannot create /proc/dri\n");
382 ret = -1;
383 goto err_p3;
384 }
385
386 DRM_INFO("Initialized %s %d.%d.%d %s\n",
387 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
388 return 0;
389 err_p3:
390 drm_sysfs_destroy(drm_class);
391 err_p2:
392 unregister_chrdev(DRM_MAJOR, "drm");
393 drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
394 err_p1:
395 return ret;
396 }
397
398 static void __exit drm_core_exit(void)
399 {
400 remove_proc_entry("dri", NULL);
401 drm_sysfs_destroy(drm_class);
402
403 unregister_chrdev(DRM_MAJOR, "drm");
404
405 drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
406 }
407
408 module_init(drm_core_init);
409 module_exit(drm_core_exit);
410
411 /**
412 * Get version information
413 *
414 * \param inode device inode.
415 * \param filp file pointer.
416 * \param cmd command.
417 * \param arg user argument, pointing to a drm_version structure.
418 * \return zero on success or negative number on failure.
419 *
420 * Fills in the version information in \p arg.
421 */
422 static int drm_version(struct drm_device *dev, void *data,
423 struct drm_file *file_priv)
424 {
425 struct drm_version *version = data;
426 int len;
427
428 version->version_major = dev->driver->major;
429 version->version_minor = dev->driver->minor;
430 version->version_patchlevel = dev->driver->patchlevel;
431 DRM_COPY(version->name, dev->driver->name);
432 DRM_COPY(version->date, dev->driver->date);
433 DRM_COPY(version->desc, dev->driver->desc);
434
435 return 0;
436 }
437
438 /**
439 * Called whenever a process performs an ioctl on /dev/drm.
440 *
441 * \param inode device inode.
442 * \param file_priv DRM file private.
443 * \param cmd command.
444 * \param arg user argument.
445 * \return zero on success or negative number on failure.
446 *
447 * Looks up the ioctl function in the ::ioctls table, checking for root
448 * previleges if so required, and dispatches to the respective function.
449 */
450 int drm_ioctl(struct inode *inode, struct file *filp,
451 unsigned int cmd, unsigned long arg)
452 {
453 struct drm_file *file_priv = filp->private_data;
454 struct drm_device *dev = file_priv->head->dev;
455 struct drm_ioctl_desc *ioctl;
456 drm_ioctl_t *func;
457 unsigned int nr = DRM_IOCTL_NR(cmd);
458 int retcode = -EINVAL;
459 char *kdata = NULL;
460
461 atomic_inc(&dev->ioctl_count);
462 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
463 ++file_priv->ioctl_count;
464
465 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
466 current->pid, cmd, nr,
467 (long)old_encode_dev(file_priv->head->device),
468 file_priv->authenticated);
469
470 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
471 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
472 goto err_i1;
473 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
474 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
475 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
476 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE))
477 ioctl = &drm_ioctls[nr];
478 else
479 goto err_i1;
480
481 func = ioctl->func;
482 /* is there a local override? */
483 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
484 func = dev->driver->dma_ioctl;
485
486
487 if (!func) {
488 DRM_DEBUG("no function\n");
489 retcode = -EINVAL;
490 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
491 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
492 ((ioctl->flags & DRM_MASTER) && !file_priv->master)) {
493 retcode = -EACCES;
494 } else {
495 if (cmd & (IOC_IN | IOC_OUT)) {
496 kdata = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
497 if (!kdata)
498 return -ENOMEM;
499 }
500
501 if (cmd & IOC_IN) {
502 if (copy_from_user(kdata, (void __user *)arg,
503 _IOC_SIZE(cmd)) != 0) {
504 retcode = -EACCES;
505 goto err_i1;
506 }
507 }
508 retcode = func(dev, kdata, file_priv);
509
510 if (cmd & IOC_OUT) {
511 if (copy_to_user((void __user *)arg, kdata,
512 _IOC_SIZE(cmd)) != 0)
513 retcode = -EACCES;
514 }
515 }
516
517 err_i1:
518 if (kdata)
519 kfree(kdata);
520 atomic_dec(&dev->ioctl_count);
521 if (retcode)
522 DRM_DEBUG("ret = %x\n", retcode);
523 return retcode;
524 }
525
526 EXPORT_SYMBOL(drm_ioctl);
527
528 drm_local_map_t *drm_getsarea(struct drm_device *dev)
529 {
530 struct drm_map_list *entry;
531
532 list_for_each_entry(entry, &dev->maplist, head) {
533 if (entry->map && entry->map->type == _DRM_SHM &&
534 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
535 return entry->map;
536 }
537 }
538 return NULL;
539 }
540 EXPORT_SYMBOL(drm_getsarea);
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