summaryrefslogtreecommitdiff
path: root/sys/dev/pci/drm/drm_drv.c
blob: 3f21301559a5619e6ab810894a23eaedcce30243 (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
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
/*-
 * 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.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 *
 */

/** @file drm_drv.c
 * The catch-all file for DRM device support, including module setup/teardown,
 * open/close, and ioctl dispatch.
 */

#include <sys/limits.h>
#include "drmP.h"
#include "drm.h"
#include "drm_sarea.h"
#include <sys/ttycom.h> /* for TIOCSGRP */

#ifdef DRM_DEBUG_DEFAULT_ON
int drm_debug_flag = 1;
#else
int drm_debug_flag = 0;
#endif

int	 drm_load(drm_device_t *);
void	 drm_unload(drm_device_t *);
drm_pci_id_list_t *drm_find_description(int , int ,
	    drm_pci_id_list_t *);
int	 drm_firstopen(drm_device_t *);
int	 drm_lastclose(drm_device_t *);

static drm_ioctl_desc_t		  drm_ioctls[256] = {
	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_MASTER|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_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
	DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER),
	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),
	DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma, DRM_AUTH),

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

	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),

	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_draw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
};

drm_device_t *drm_units[DRM_MAXUNITS];

static int init_units = 1;

int
drm_probe(struct pci_attach_args *pa, drm_pci_id_list_t *idlist)
{
	int unit;
	drm_pci_id_list_t *id_entry;

	/* first make sure there is place for the device */
	for(unit=0; unit<DRM_MAXUNITS; unit++)
		if(drm_units[unit] == NULL) break;
	if(unit == DRM_MAXUNITS) return 0;

	id_entry = drm_find_description(PCI_VENDOR(pa->pa_id),
	    PCI_PRODUCT(pa->pa_id), idlist);
	if (id_entry != NULL) {
		return 1;
	}

	return 0;
}

void
drm_attach(struct device *parent, struct device *kdev,
    struct pci_attach_args *pa, drm_pci_id_list_t *idlist)
{
	int unit;
	drm_device_t *dev;
	drm_pci_id_list_t *id_entry;

	if(init_units) {
		for(unit=0; unit<DRM_MAXUNITS;unit++)
			drm_units[unit] = NULL;
		init_units = 0;
	}


        for(unit=0; unit<DRM_MAXUNITS; unit++)
		if(drm_units[unit] == NULL) break;
	if(unit == DRM_MAXUNITS) return;

	dev = drm_units[unit] = (drm_device_t*)kdev;
	dev->unit = unit;

	/* needed for pci_mapreg_* */
	memcpy(&dev->pa, pa, sizeof(dev->pa));
	dev->vga_softc = (struct vga_pci_softc *)parent;

	dev->irq = pa->pa_intrline;
	dev->pci_bus = pa->pa_bus;
	dev->pci_slot = pa->pa_device;
	dev->pci_func = pa->pa_function;
	DRM_SPININIT(&dev->dev_lock, "drm device");
	DRM_SPININIT(&dev->drw_lock, "drm drawable lock");

	id_entry = drm_find_description(PCI_VENDOR(pa->pa_id),
	    PCI_PRODUCT(pa->pa_id), idlist);
	dev->id_entry = id_entry;
	dev->driver.id_entry = id_entry;

	printf("\n");
	DRM_INFO("%s (unit %d)\n", id_entry->name, dev->unit);
	drm_load(dev);
}

int
drm_detach(struct device *self, int flags)
{
	drm_unload((drm_device_t *)self);
	return 0;
}

int
drm_activate(struct device *self, enum devact act)
{
	switch (act) {
	case DVACT_ACTIVATE:
		return (EOPNOTSUPP);
		break;

	case DVACT_DEACTIVATE:
		/* FIXME */
		break;
	}
	return (0);
}

drm_pci_id_list_t *
drm_find_description(int vendor, int device, drm_pci_id_list_t *idlist)
{
	int i = 0;
	
	for (i = 0; idlist[i].vendor != 0; i++) {
		if ((idlist[i].vendor == vendor) &&
		    (idlist[i].device == device)) {
			return &idlist[i];
		}
	}
	return NULL;
}

int
drm_firstopen(drm_device_t *dev)
{
	drm_local_map_t *map;
	int i;

	DRM_SPINLOCK_ASSERT(&dev->dev_lock);

	/* prebuild the SAREA */
	i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
	    _DRM_CONTAINS_LOCK, &map);
	if (i != 0)
		return i;

	if (dev->driver.firstopen)
		dev->driver.firstopen(dev);

	dev->buf_use = 0;

	if (dev->driver.use_dma) {
		i = drm_dma_setup(dev);
		if (i != 0)
			return i;
	}

	dev->counters = 6;
	dev->types[0] = _DRM_STAT_LOCK;
	dev->types[1] = _DRM_STAT_OPENS;
	dev->types[2] = _DRM_STAT_CLOSES;
	dev->types[3] = _DRM_STAT_IOCTLS;
	dev->types[4] = _DRM_STAT_LOCKS;
	dev->types[5] = _DRM_STAT_UNLOCKS;

	for ( i = 0 ; i < DRM_ARRAY_SIZE(dev->counts) ; i++ )
		atomic_set( &dev->counts[i], 0 );

	SPLAY_INIT(&dev->magiclist);

	dev->lock.lock_queue = 0;
	dev->irq_enabled = 0;
	dev->context_flag = 0;
	dev->last_context = 0;
	dev->if_version = 0;

	dev->buf_pgid = 0;

	DRM_DEBUG( "\n" );

	return 0;
}

int
drm_lastclose(drm_device_t *dev)
{
	struct drm_magic_entry *pt;
	drm_local_map_t *map, *mapsave;

	DRM_SPINLOCK_ASSERT(&dev->dev_lock);

	DRM_DEBUG( "\n" );

	if (dev->driver.lastclose != NULL)
		dev->driver.lastclose(dev);

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

	if ( dev->unique ) {
		free(dev->unique, M_DRM);
		dev->unique = NULL;
		dev->unique_len = 0;
	}

	drm_drawable_free_all(dev);
				/* Clear pid list */
	while ((pt = SPLAY_ROOT(&dev->magiclist)) != NULL) {
		SPLAY_REMOVE(drm_magic_tree, &dev->magiclist, pt);
		free(pt, M_DRM);
	}

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

		/* Remove AGP resources, but leave dev->agp intact until
		 * drm_unload is called.
		 */
		while ((entry = TAILQ_FIRST(&dev->agp->memory)) != NULL) {
			if ( entry->bound )
				drm_agp_unbind_memory(entry->handle);
			drm_agp_free_memory(entry->handle);
			TAILQ_REMOVE(&dev->agp->memory, entry, link);
			free(entry, M_DRM);
		}

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

		dev->agp->acquired = 0;
		dev->agp->enabled  = 0;
	}
	if (dev->sg != NULL) {
		drm_sg_cleanup(dev->sg);
		dev->sg = NULL;
	}

	for (map = TAILQ_FIRST(&dev->maplist); map != TAILQ_END(&dev->maplist);
	    map = mapsave) {
		mapsave = TAILQ_NEXT(map, link);
		if (!(map->flags & _DRM_DRIVER))
			drm_rmmap(dev, map);
	}

	drm_dma_takedown(dev);
	if ( dev->lock.hw_lock ) {
		dev->lock.hw_lock = NULL; /* SHM removed */
		dev->lock.file_priv = NULL;
		DRM_WAKEUP_INT((void *)&dev->lock.lock_queue);
	}

	return 0;
}

int
drm_load(drm_device_t *dev)
{
	int retcode;

	DRM_DEBUG( "\n" );

	dev->irq = dev->pa.pa_intrline;
	dev->pci_domain = 0;
	dev->pci_bus = dev->pa.pa_bus;
	dev->pci_slot = dev->pa.pa_device;
	dev->pci_func = dev->pa.pa_function;

	dev->pci_vendor = PCI_VENDOR(dev->pa.pa_id);
	dev->pci_device = PCI_PRODUCT(dev->pa.pa_id);

	TAILQ_INIT(&dev->maplist);

	drm_mem_init();
	TAILQ_INIT(&dev->files);

	/*
	 * the dma buffers api is just weird. offset 1Gb to ensure we don't
	 * conflict with it.
	 */
	retcode = drm_memrange_init(&dev->handle_mm, 1024*1024*1024, LONG_MAX);
	if (retcode != 0) {
		DRM_ERROR("Failed to initialise handle memrange\n");
		goto error;
	}

	if (dev->driver.load != NULL) {
		DRM_LOCK();
		/* Shared code returns -errno. */
		retcode = -dev->driver.load(dev,
		    dev->id_entry->driver_private);
		DRM_UNLOCK();
		if (retcode != 0)
			goto error;
	}

	if (dev->driver.use_agp) {
		if (drm_device_is_agp(dev))
			dev->agp = drm_agp_init();
		if (dev->driver.require_agp && dev->agp == NULL) {
			DRM_ERROR("Card isn't AGP, or couldn't initialize "
			    "AGP.\n");
			retcode = ENOMEM;
			goto error;
		}
#ifndef DRM_NO_MTRR
		if (dev->agp != NULL) {
			if (drm_mtrr_add(dev->agp->info.ai_aperture_base,
			    dev->agp->info.ai_aperture_size, DRM_MTRR_WC) == 0)
				dev->agp->mtrr = 1;
		}
#endif
	}

	retcode = drm_ctxbitmap_init(dev);
	if (retcode != 0) {
		DRM_ERROR("Cannot allocate memory for context bitmap.\n");
		goto error;
	}
	DRM_INFO("Initialized %s %d.%d.%d %s\n",
	    dev->driver.name,
	    dev->driver.major,
	    dev->driver.minor,
	    dev->driver.patchlevel,
	    dev->driver.date);

	return 0;

error:
	DRM_LOCK();
	drm_lastclose(dev);
	DRM_UNLOCK();
	DRM_SPINUNINIT(&dev->dev_lock);
	return retcode;
}

void
drm_unload(drm_device_t *dev)
{

	DRM_DEBUG( "\n" );

	drm_ctxbitmap_cleanup(dev);

	drm_memrange_takedown(&dev->handle_mm);

#if !defined(DRM_NO_MTRR) && !defined(DRM_NO_AGP)
	if (dev->agp && dev->agp->mtrr) {
		int retcode;

		retcode = drm_mtrr_del(0, dev->agp->info.ai_aperture_base,
		    dev->agp->info.ai_aperture_size, DRM_MTRR_WC);
		DRM_DEBUG("mtrr_del = %d", retcode);
	}
#endif

	DRM_LOCK();
	drm_lastclose(dev);
	DRM_UNLOCK();

	if ( dev->agp ) {
		free(dev->agp, M_DRM);
		dev->agp = NULL;
	}

	if (dev->driver.unload != NULL)
		dev->driver.unload(dev);

	drm_mem_uninit();
	DRM_SPINUNINIT(&dev->dev_lock);
}


int
drm_version(drm_device_t *dev, void *data, struct drm_file *file_priv)
{
	drm_version_t *version = data;
	int len;

#define DRM_COPY( name, value )						\
	len = strlen( value );						\
	if ( len > name##_len ) len = name##_len;			\
	name##_len = strlen( value );					\
	if ( len && name ) {						\
		if ( DRM_COPY_TO_USER( name, value, len ) )		\
			return EFAULT;				\
	}

	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;
}

int
drm_open(DRM_CDEV kdev, int flags, int fmt, DRM_STRUCTPROC *p)
{
	drm_device_t *dev = NULL;
	int retcode = 0;

	dev = drm_get_device_from_kdev(kdev);
	if (dev == NULL)
		return (ENXIO);

	dev->kdev = kdev; /* hack for now */

	DRM_DEBUG( "open_count = %d\n", dev->open_count );

	retcode = drm_open_helper(kdev, flags, fmt, p, dev);

	if ( !retcode ) {
		atomic_inc( &dev->counts[_DRM_STAT_OPENS] );
		DRM_LOCK();
		if ( !dev->open_count++ )
			retcode = drm_firstopen(dev);
		DRM_UNLOCK();
	}

	return retcode;
}

int
drm_close(DRM_CDEV kdev, int flags, int fmt, DRM_STRUCTPROC *p)
{
	drm_device_t *dev = drm_get_device_from_kdev(kdev);
	drm_file_t *file_priv;
	int retcode = 0;

	DRM_DEBUG( "open_count = %d\n", dev->open_count );

	DRM_LOCK();

	file_priv = drm_find_file_by_minor(dev, minor(kdev));
	if (!file_priv) {
		DRM_UNLOCK();
		DRM_ERROR("can't find authenticator\n");
		retcode = EINVAL;
		goto done;
	}

	if (--file_priv->refs != 0)
		goto done;

	if (dev->driver.preclose != NULL)
		dev->driver.preclose(dev, file_priv);

	/* ========================================================
	 * Begin inline drm_release
	 */

	DRM_DEBUG( "pid = %d, device = 0x%lx, open_count = %d\n",
	    DRM_CURRENTPID, (long)&dev->device, dev->open_count);

	if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)
	    && dev->lock.file_priv == file_priv) {
		DRM_DEBUG("Process %d dead, freeing lock for context %d\n",
		    DRM_CURRENTPID,
		    _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
		if (dev->driver.reclaim_buffers_locked != NULL)
			dev->driver.reclaim_buffers_locked(dev, file_priv);

		drm_lock_free(dev, &dev->lock.hw_lock->lock,
		    _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
		
				/* FIXME: may require heavy-handed reset of
                                   hardware at this point, possibly
                                   processed via a callback to the X
                                   server. */
	} else if (dev->driver.reclaim_buffers_locked != NULL &&
	    dev->lock.hw_lock != NULL) {
		/* The lock is required to reclaim buffers */
		for (;;) {
			if ( !dev->lock.hw_lock ) {
				/* Device has been unregistered */
				retcode = EINTR;
				break;
			}
			if (drm_lock_take(&dev->lock.hw_lock->lock,
			    DRM_KERNEL_CONTEXT)) {
				dev->lock.file_priv = file_priv;
				dev->lock.lock_time = jiffies;
                                atomic_inc( &dev->counts[_DRM_STAT_LOCKS] );
				break;	/* Got lock */
			}
				/* Contention */
			retcode = DRM_SLEEPLOCK((void *)&dev->lock.lock_queue,
			    &dev->dev_lock, PZERO | PCATCH, "drmlk2", 0);
			if (retcode)
				break;
		}
		if (retcode == 0) {
			dev->driver.reclaim_buffers_locked(dev, file_priv);
			drm_lock_free(dev, &dev->lock.hw_lock->lock,
			    DRM_KERNEL_CONTEXT);
		}
	}

	if (dev->driver.use_dma && !dev->driver.reclaim_buffers_locked)
		drm_reclaim_buffers(dev, file_priv);

	dev->buf_pgid = 0;

	if (dev->driver.postclose != NULL)
		dev->driver.postclose(dev, file_priv);
	TAILQ_REMOVE(&dev->files, file_priv, link);
	free(file_priv, M_DRM);

	/* ========================================================
	 * End inline drm_release
	 */

done:
	atomic_inc( &dev->counts[_DRM_STAT_CLOSES] );
	if (--dev->open_count == 0) {
		retcode = drm_lastclose(dev);
	}

	DRM_UNLOCK();
	
	return retcode;
}

/* drm_ioctl is called whenever a process performs an ioctl on /dev/drm.
 */
int
drm_ioctl(DRM_CDEV kdev, u_long cmd, caddr_t data, int flags, 
    DRM_STRUCTPROC *p)
{
	drm_device_t *dev = drm_get_device_from_kdev(kdev);
	int retcode = 0;
	drm_ioctl_desc_t *ioctl;
	int (*func)(drm_device_t *dev, void *data, struct drm_file *file_priv);
	int nr = DRM_IOCTL_NR(cmd);
	int is_driver_ioctl = 0;
	drm_file_t *file_priv;

	if (dev == NULL)
		return ENODEV;

	DRM_LOCK();
	file_priv = drm_find_file_by_minor(dev, minor(kdev));
	DRM_UNLOCK();
	if (file_priv == NULL) {
		DRM_ERROR("can't find authenticator\n");
		return EINVAL;
	}

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

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

	switch (cmd) {
	case FIONBIO:
	case FIOASYNC:
		return 0;

	case TIOCSPGRP:
		dev->buf_pgid = *(int *)data;
		return 0;

	case TIOCGPGRP:
		*(int *)data = dev->buf_pgid;
		return 0;
	}

	if (IOCGROUP(cmd) != DRM_IOCTL_BASE) {
		DRM_DEBUG("Bad ioctl group 0x%x\n", (int)IOCGROUP(cmd));
		return EINVAL;
	}

	ioctl = &drm_ioctls[nr];
	/* It's not a core DRM ioctl, try driver-specific. */
	if (ioctl->func == NULL && nr >= DRM_COMMAND_BASE) {
		/* The array entries begin at DRM_COMMAND_BASE ioctl nr */
		nr -= DRM_COMMAND_BASE;
		if (nr > dev->driver.max_ioctl) {
			DRM_DEBUG("Bad driver ioctl number, 0x%x (of 0x%x)\n",
			    nr, dev->driver.max_ioctl);
			return EINVAL;
		}
		ioctl = &dev->driver.ioctls[nr];
		is_driver_ioctl = 1;
	}
	func = ioctl->func;

	if (func == NULL) {
		DRM_DEBUG( "no function\n" );
		return EINVAL;
	}

	/* 
	 * master must be root, and all ioctls that are ROOT_ONLY are
	 * also DRM_MASTER.
	 */
	if (((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
	    ((ioctl->flags & DRM_MASTER) && !file_priv->master))
		return EACCES;

	if (is_driver_ioctl) {
		DRM_LOCK();
		/* shared code returns -errno */
		retcode = -func(dev, data, file_priv);
		DRM_UNLOCK();
	} else {
		retcode = func(dev, data, file_priv);
	}

	if (retcode != 0)
		DRM_DEBUG("    returning %d\n", retcode);

	return retcode;
}

drm_local_map_t *
drm_getsarea(drm_device_t *dev)
{
	drm_local_map_t *map;

	DRM_SPINLOCK_ASSERT(&dev->dev_lock);
	TAILQ_FOREACH(map, &dev->maplist, link) {
		if (map->type == _DRM_SHM && (map->flags & _DRM_CONTAINS_LOCK))
			return map;
	}

	return NULL;
}