aboutsummaryrefslogtreecommitdiff
path: root/linux-core/drm_drv.c
blob: d3e2ca991289e56455c1faf33430a0265fa0d97d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
/**
 * \file drm_drv.c
 * Generic driver template
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 *
 * To use this template, you must at least define the following (samples
 * given for the MGA driver):
 *
 * \code
 * #define DRIVER_AUTHOR	"VA Linux Systems, Inc."
 *
 * #define DRIVER_NAME		"mga"
 * #define DRIVER_DESC		"Matrox G200/G400"
 * #define DRIVER_DATE		"20001127"
 *
 * #define drm_x		mga_##x
 * \endcode
 */

/*
 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
#include "drmP.h"
#include "drm_core.h"

static void drm_cleanup(struct drm_device * dev);
int drm_fb_loaded = 0;

static int drm_version(struct drm_device *dev, void *data,
		       struct drm_file *file_priv);

/** Ioctl table */
static struct drm_ioctl_desc drm_ioctls[] = {
	DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

	DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
	/* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
	DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),

	DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

#if __OS_HAS_AGP
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
#endif

	DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),

	DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),

#if OS_HAS_GEM
	DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, 0),
	DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH),
	DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH),
#endif
};

#define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )


/**
 * Take down the DRM device.
 *
 * \param dev DRM device structure.
 *
 * Frees every resource in \p dev.
 *
 * \sa drm_device
 */
int drm_lastclose(struct drm_device * dev)
{
	struct drm_magic_entry *pt, *next;
	struct drm_map_list *r_list, *list_t;
	struct drm_vma_entry *vma, *vma_temp;
	int i;

	DRM_DEBUG("\n");

	/*
	 * We can't do much about this function failing.
	 */

	if (dev->driver->lastclose)
		dev->driver->lastclose(dev);
	DRM_DEBUG("driver lastclose completed\n");

	if (dev->unique) {
		drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
		dev->unique = NULL;
		dev->unique_len = 0;
	}

	if (dev->irq_enabled)
		drm_irq_uninstall(dev);

	/* Free drawable information memory */
	mutex_lock(&dev->struct_mutex);

	drm_drawable_free_all(dev);
	del_timer(&dev->timer);

	if (dev->unique) {
		drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
		dev->unique = NULL;
		dev->unique_len = 0;
	}

	if (dev->magicfree.next) {
		list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
			list_del(&pt->head);
			drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
			drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
		}
		drm_ht_remove(&dev->magiclist);
	}


	/* Clear AGP information */
	if (drm_core_has_AGP(dev) && dev->agp) {
		struct drm_agp_mem *entry, *tempe;

		/* Remove AGP resources, but leave dev->agp
		   intact until drv_cleanup is called. */
		list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
			if (entry->bound)
				drm_unbind_agp(entry->memory);
			drm_free_agp(entry->memory, entry->pages);
			drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
		}
		INIT_LIST_HEAD(&dev->agp->memory);

		if (dev->agp->acquired)
			drm_agp_release(dev);

		dev->agp->acquired = 0;
		dev->agp->enabled = 0;
	}
	if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
		drm_sg_cleanup(dev->sg);
		dev->sg = NULL;
	}

	/* Clear vma list (only built for debugging) */
	list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
		list_del(&vma->head);
		drm_ctl_free(vma, sizeof(*vma), DRM_MEM_VMAS);
	}

	list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
		if (!(r_list->map->flags & _DRM_DRIVER)) {
			drm_rmmap_locked(dev, r_list->map);
			r_list = NULL;
		}
	}

	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
		for (i = 0; i < dev->queue_count; i++) {

			if (dev->queuelist[i]) {
				drm_free(dev->queuelist[i],
					 sizeof(*dev->queuelist[0]),
					 DRM_MEM_QUEUES);
				dev->queuelist[i] = NULL;
			}
		}
		drm_free(dev->queuelist,
			 dev->queue_slots * sizeof(*dev->queuelist),
			 DRM_MEM_QUEUES);
		dev->queuelist = NULL;
	}
	dev->queue_count = 0;

	if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
		drm_dma_takedown(dev);

	if (dev->lock.hw_lock) {
		dev->sigdata.lock = dev->lock.hw_lock = NULL;	/* SHM removed */
		dev->lock.file_priv = NULL;
		wake_up_interruptible(&dev->lock.lock_queue);
	}
	mutex_unlock(&dev->struct_mutex);

	DRM_DEBUG("lastclose completed\n");
	return 0;
}

void drm_cleanup_pci(struct pci_dev *pdev)
{
	struct drm_device *dev = pci_get_drvdata(pdev);

	pci_set_drvdata(pdev, NULL);
	pci_release_regions(pdev);
	if (dev)
		drm_cleanup(dev);
}
EXPORT_SYMBOL(drm_cleanup_pci);

/**
 * Module initialization. Called via init_module at module load time, or via
 * linux/init/main.c (this is not currently supported).
 *
 * \return zero on success or a negative number on failure.
 *
 * Initializes an array of drm_device structures, and attempts to
 * initialize all available devices, using consecutive minors, registering the
 * stubs and initializing the AGP device.
 *
 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
 * after the initialization for driver customization.
 */
int drm_init(struct drm_driver *driver,
		       struct pci_device_id *pciidlist)
{
	struct pci_dev *pdev;
	struct pci_device_id *pid;
	int rc, i;

	DRM_DEBUG("\n");

	for (i = 0; (pciidlist[i].vendor != 0) && !drm_fb_loaded; i++) {
		pid = &pciidlist[i];

		pdev = NULL;
		/* pass back in pdev to account for multiple identical cards */
		while ((pdev =
			pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
				       pid->subdevice, pdev))) {
			/* Are there device class requirements? */
			if ((pid->class != 0)
				&& ((pdev->class & pid->class_mask) != pid->class)) {
				continue;
			}
			/* is there already a driver loaded, or (short circuit saves work) */
			/* does something like VesaFB have control of the memory region? */
			if (pci_dev_driver(pdev)
			    || pci_request_regions(pdev, "DRM scan")) {
				/* go into stealth mode */
				drm_fb_loaded = 1;
				pci_dev_put(pdev);
				break;
			}
			/* no fbdev or vesadev, put things back and wait for normal probe */
			pci_release_regions(pdev);
		}
	}

	if (!drm_fb_loaded)
		return pci_register_driver(&driver->pci_driver);
	else {
		for (i = 0; pciidlist[i].vendor != 0; i++) {
			pid = &pciidlist[i];

			pdev = NULL;
			/* pass back in pdev to account for multiple identical cards */
			while ((pdev =
				pci_get_subsys(pid->vendor, pid->device,
					       pid->subvendor, pid->subdevice,
					       pdev))) {
				/* Are there device class requirements? */
				if ((pid->class != 0)
					&& ((pdev->class & pid->class_mask) != pid->class)) {
					continue;
				}
				/* stealth mode requires a manual probe */
				pci_dev_get(pdev);
				if ((rc = drm_get_dev(pdev, &pciidlist[i], driver))) {
					pci_dev_put(pdev);
					return rc;
				}
			}
		}
		DRM_INFO("Used old pci detect: framebuffer loaded\n");
	}
	return 0;
}
EXPORT_SYMBOL(drm_init);

/**
 * Called via cleanup_module() at module unload time.
 *
 * Cleans up all DRM device, calling drm_lastclose().
 *
 * \sa drm_init
 */
static void drm_cleanup(struct drm_device * dev)
{

	DRM_DEBUG("\n");
	if (!dev) {
		DRM_ERROR("cleanup called no dev\n");
		return;
	}

	drm_lastclose(dev);

	drm_vblank_cleanup(dev);

	if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) && dev->agp
	    && dev->agp->agp_mtrr >= 0) {
		int retval;
		retval = mtrr_del(dev->agp->agp_mtrr,
				  dev->agp->agp_info.aper_base,
				  dev->agp->agp_info.aper_size * 1024 * 1024);
		DRM_DEBUG("mtrr_del=%d\n", retval);
	}

	if (drm_core_has_AGP(dev) && dev->agp) {
		drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
		dev->agp = NULL;
	}
	if (dev->driver->unload)
		dev->driver->unload(dev);

	if (!drm_fb_loaded)
		pci_disable_device(dev->pdev);

	drm_ctxbitmap_cleanup(dev);
	drm_ht_remove(&dev->map_hash);

	drm_put_minor(dev);
	if (drm_put_dev(dev))
		DRM_ERROR("Cannot unload module\n");
}

int drm_minors_cleanup(int id, void *ptr, void *data)
{
	struct drm_minor *minor = ptr;
	struct drm_device *dev;
	struct drm_driver *driver = data;

	dev = minor->dev;
	if (minor->dev->driver != driver)
		return 0;

	if (minor->type != DRM_MINOR_LEGACY)
		return 0;

	if (dev)
		pci_dev_put(dev->pdev);
	drm_cleanup(dev);
	return 1;
}

void drm_exit(struct drm_driver *driver)
{
	DRM_DEBUG("\n");
	if (drm_fb_loaded) {
		idr_for_each(&drm_minors_idr, &drm_minors_cleanup, driver);
	} else
		pci_unregister_driver(&driver->pci_driver);
	DRM_INFO("Module unloaded\n");
}
EXPORT_SYMBOL(drm_exit);

/** File operations structure */
static const struct file_operations drm_stub_fops = {
	.owner = THIS_MODULE,
	.open = drm_stub_open
};

static int __init drm_core_init(void)
{
	int ret;
	struct sysinfo si;
	unsigned long avail_memctl_mem;
	unsigned long max_memctl_mem;

	idr_init(&drm_minors_idr);
	si_meminfo(&si);

	/*
	 * AGP only allows low / DMA32 memory ATM.
	 */

	avail_memctl_mem = si.totalram - si.totalhigh;

	/*
	 * Avoid overflows
	 */

	max_memctl_mem = 1UL << (32 - PAGE_SHIFT);
	max_memctl_mem = (max_memctl_mem / si.mem_unit) * PAGE_SIZE;

	if (avail_memctl_mem >= max_memctl_mem)
		avail_memctl_mem = max_memctl_mem;

	drm_init_memctl(avail_memctl_mem/2, avail_memctl_mem*3/4, si.mem_unit);

	ret = -ENOMEM;

	if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
		goto err_p1;

	drm_class = drm_sysfs_create(THIS_MODULE, "drm");
	if (IS_ERR(drm_class)) {
		printk(KERN_ERR "DRM: Error creating drm class.\n");
		ret = PTR_ERR(drm_class);
		goto err_p2;
	}

	drm_proc_root = proc_mkdir("dri", NULL);
	if (!drm_proc_root) {
		DRM_ERROR("Cannot create /proc/dri\n");
		ret = -1;
		goto err_p3;
	}

	drm_mem_init();

	DRM_INFO("Initialized %s %d.%d.%d %s\n",
		 CORE_NAME,
		 CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
	return 0;
err_p3:
	drm_sysfs_destroy();
err_p2:
	unregister_chrdev(DRM_MAJOR, "drm");

	idr_destroy(&drm_minors_idr);
err_p1:
	return ret;
}

static void __exit drm_core_exit(void)
{
	remove_proc_entry("dri", NULL);
	drm_sysfs_destroy();

	unregister_chrdev(DRM_MAJOR, "drm");

	idr_destroy(&drm_minors_idr);
}

module_init(drm_core_init);
module_exit(drm_core_exit);

/**
 * Get version information
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument, pointing to a drm_version structure.
 * \return zero on success or negative number on failure.
 *
 * Fills in the version information in \p arg.
 */
static int drm_version(struct drm_device *dev, void *data,
		       struct drm_file *file_priv)
{
	struct drm_version *version = data;
	int len;

	version->version_major = dev->driver->major;
	version->version_minor = dev->driver->minor;
	version->version_patchlevel = dev->driver->patchlevel;
	DRM_COPY(version->name, dev->driver->name);
	DRM_COPY(version->date, dev->driver->date);
	DRM_COPY(version->desc, dev->driver->desc);

	return 0;
}

/**
 * Called whenever a process performs an ioctl on /dev/drm.
 *
 * \param inode device inode.
 * \param file_priv DRM file private.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or negative number on failure.
 *
 * Looks up the ioctl function in the ::ioctls table, checking for root
 * previleges if so required, and dispatches to the respective function.
 *
 * Copies data in and out according to the size and direction given in cmd,
 * which must match the ioctl cmd known by the kernel.  The kernel uses a 512
 * byte stack buffer to store the ioctl arguments in kernel space.  Should we
 * ever need much larger ioctl arguments, we may need to allocate memory.
 */
int drm_ioctl(struct inode *inode, struct file *filp,
	      unsigned int cmd, unsigned long arg)
{
	return drm_unlocked_ioctl(filp, cmd, arg);
}
EXPORT_SYMBOL(drm_ioctl);

long drm_unlocked_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	struct drm_file *file_priv = filp->private_data;
	struct drm_device *dev = file_priv->minor->dev;
	struct drm_ioctl_desc *ioctl;
	drm_ioctl_t *func;
	unsigned int nr = DRM_IOCTL_NR(cmd);
	int retcode = -EINVAL;
	char kdata[512];

	atomic_inc(&dev->ioctl_count);
	atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
	++file_priv->ioctl_count;

	DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
		  current->pid, cmd, nr, (long)old_encode_dev(file_priv->minor->device),
		  file_priv->authenticated);

	if ((nr >= DRM_CORE_IOCTL_COUNT) &&
	    ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
		goto err_i1;
	if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END)
		&& (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
		ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
	else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
		ioctl = &drm_ioctls[nr];
		cmd = ioctl->cmd;
	} else {
		retcode = -EINVAL;
		goto err_i1;
	}
#if 0
	/*
	 * This check is disabled, because driver private ioctl->cmd
	 * are not the ioctl commands with size and direction bits but
	 * just the indices. The DRM core ioctl->cmd are the proper ioctl
	 * commands. The drivers' ioctl tables need to be fixed.
	 */
	if (ioctl->cmd != cmd) {
		retcode = -EINVAL;
		goto err_i1;
	}
#endif

	func = ioctl->func;
	/* is there a local override? */
	if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
		func = dev->driver->dma_ioctl;

	if (cmd & IOC_IN) {
		if (copy_from_user(kdata, (void __user *)arg,
				   _IOC_SIZE(cmd)) != 0) {
			retcode = -EACCES;
			goto err_i1;
		}
	}

	if (!func) {
		DRM_DEBUG("no function\n");
		retcode = -EINVAL;
	} else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
		   ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
		   ((ioctl->flags & DRM_MASTER) && !file_priv->master)) {
		retcode = -EACCES;
	} else {
		retcode = func(dev, kdata, file_priv);
	}

	if (cmd & IOC_OUT) {
		if (copy_to_user((void __user *)arg, kdata,
				 _IOC_SIZE(cmd)) != 0)
			retcode = -EACCES;
	}

err_i1:
	atomic_dec(&dev->ioctl_count);
	if (retcode)
		DRM_DEBUG("ret = %d\n", retcode);
	return retcode;
}
EXPORT_SYMBOL(drm_unlocked_ioctl);

drm_local_map_t *drm_getsarea(struct drm_device *dev)
{
	struct drm_map_list *entry;

	list_for_each_entry(entry, &dev->maplist, head) {
		if (entry->map && entry->map->type == _DRM_SHM &&
		    (entry->map->flags & _DRM_CONTAINS_LOCK)) {
			return entry->map;
		}
	}
	return NULL;
}
EXPORT_SYMBOL(drm_getsarea);