summaryrefslogtreecommitdiff
path: root/linux/gamma_drv.c
blob: dba974c2b92c1caa20c4a33534ac018b66d52752 (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
/* gamma.c -- 3dlabs GMX 2000 driver -*- linux-c -*-
 * Created: Mon Jan  4 08:58:31 1999 by faith@precisioninsight.com
 *
 * Copyright 1999 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
 * PRECISION INSIGHT 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>
 *
 */

#include <linux/config.h>
#include "drmP.h"
#include "gamma_drv.h"

#ifndef PCI_DEVICE_ID_3DLABS_GAMMA
#define PCI_DEVICE_ID_3DLABS_GAMMA 0x0008
#endif
#ifndef PCI_DEVICE_ID_3DLABS_MX
#define PCI_DEVICE_ID_3DLABS_MX 0x0006
#endif

#define GAMMA_NAME	 "gamma"
#define GAMMA_DESC	 "3dlabs GMX 2000"
#define GAMMA_DATE	 "20000910"
#define GAMMA_MAJOR	 1
#define GAMMA_MINOR	 0
#define GAMMA_PATCHLEVEL 0

static drm_device_t	      gamma_device;

static struct file_operations gamma_fops = {
#if LINUX_VERSION_CODE >= 0x020400
				/* This started being used during 2.4.0-test */
	owner:   THIS_MODULE,
#endif
	open:	 gamma_open,
	flush:	 drm_flush,
	release: gamma_release,
	ioctl:	 gamma_ioctl,
	mmap:	 drm_mmap,
	read:	 drm_read,
	fasync:	 drm_fasync,
	poll:	 drm_poll,
};

static struct miscdevice      gamma_misc = {
	minor: MISC_DYNAMIC_MINOR,
	name:  GAMMA_NAME,
	fops:  &gamma_fops,
};

static drm_ioctl_desc_t	      gamma_ioctls[] = {
	[DRM_IOCTL_NR(DRM_IOCTL_VERSION)]    = { gamma_version,	  0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = { drm_getunique,	  0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)]  = { drm_getmagic,	  0, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)]  = { drm_irq_busid,	  0, 1 },

	[DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = { drm_setunique,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_BLOCK)]	     = { drm_block,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)]    = { drm_unblock,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_CONTROL)]    = { gamma_control,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = { drm_authmagic,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)]    = { drm_addmap,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)]   = { drm_addbufs,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)]  = { drm_markbufs,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)]  = { drm_infobufs,	  1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)]   = { drm_mapbufs,	  1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)]  = { drm_freebufs,	  1, 0 },

	[DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)]    = { drm_addctx,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)]     = { drm_rmctx,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)]    = { drm_modctx,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)]    = { drm_getctx,	  1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = { drm_switchctx,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)]    = { drm_newctx,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)]    = { drm_resctx,	  1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)]   = { drm_adddraw,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)]    = { drm_rmdraw,	  1, 1 },
	[DRM_IOCTL_NR(DRM_IOCTL_DMA)]	     = { gamma_dma,	  1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_LOCK)]	     = { gamma_lock,	  1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)]     = { gamma_unlock,	  1, 0 },
	[DRM_IOCTL_NR(DRM_IOCTL_FINISH)]     = { drm_finish,	  1, 0 },
};
#define GAMMA_IOCTL_COUNT DRM_ARRAY_SIZE(gamma_ioctls)

#ifdef MODULE
static char		      *gamma = NULL;
#endif
static int 		      devices = 0;

MODULE_AUTHOR("VA Linux Systems, Inc.");
MODULE_DESCRIPTION("3dlabs GMX 2000");
MODULE_PARM(gamma, "s");
MODULE_PARM(devices, "i");
MODULE_PARM_DESC(devices,
		 "devices=x, where x is the number of MX chips on card\n");
#ifndef MODULE
/* gamma_options is called by the kernel to parse command-line options
 * passed via the boot-loader (e.g., LILO).  It calls the insmod option
 * routine, drm_parse_options.
 */


static int __init gamma_options(char *str)
{
	drm_parse_options(str);
	return 1;
}

__setup("gamma=", gamma_options);
#endif

static int gamma_setup(drm_device_t *dev)
{
	int i;

	atomic_set(&dev->ioctl_count, 0);
	atomic_set(&dev->vma_count, 0);
	dev->buf_use	  = 0;
	atomic_set(&dev->buf_alloc, 0);

	drm_dma_setup(dev);

	atomic_set(&dev->total_open, 0);
	atomic_set(&dev->total_close, 0);
	atomic_set(&dev->total_ioctl, 0);
	atomic_set(&dev->total_irq, 0);
	atomic_set(&dev->total_ctx, 0);
	atomic_set(&dev->total_locks, 0);
	atomic_set(&dev->total_unlocks, 0);
	atomic_set(&dev->total_contends, 0);
	atomic_set(&dev->total_sleeps, 0);

	for (i = 0; i < DRM_HASH_SIZE; i++) {
		dev->magiclist[i].head = NULL;
		dev->magiclist[i].tail = NULL;
	}
	dev->maplist	    = NULL;
	dev->map_count	    = 0;
	dev->vmalist	    = NULL;
	dev->lock.hw_lock   = NULL;
	init_waitqueue_head(&dev->lock.lock_queue);
	dev->queue_count    = 0;
	dev->queue_reserved = 0;
	dev->queue_slots    = 0;
	dev->queuelist	    = NULL;
	dev->irq	    = 0;
	dev->context_flag   = 0;
	dev->interrupt_flag = 0;
	dev->dma_flag	    = 0;
	dev->last_context   = 0;
	dev->last_switch    = 0;
	dev->last_checked   = 0;
	init_timer(&dev->timer);
	init_waitqueue_head(&dev->context_wait);
#if DRM_DMA_HISTO
	memset(&dev->histo, 0, sizeof(dev->histo));
#endif
	dev->ctx_start	    = 0;
	dev->lck_start	    = 0;

	dev->buf_rp	  = dev->buf;
	dev->buf_wp	  = dev->buf;
	dev->buf_end	  = dev->buf + DRM_BSZ;
	dev->buf_async	  = NULL;
	init_waitqueue_head(&dev->buf_readers);
	init_waitqueue_head(&dev->buf_writers);

	DRM_DEBUG("\n");

	/* The kernel's context could be created here, but is now created
	   in drm_dma_enqueue.	This is more resource-efficient for
	   hardware that does not do DMA, but may mean that
	   drm_select_queue fails between the time the interrupt is
	   initialized and the time the queues are initialized. */

	return 0;
}


static int gamma_takedown(drm_device_t *dev)
{
	int		  i;
	drm_magic_entry_t *pt, *next;
	drm_map_t	  *map;
	drm_vma_entry_t	  *vma, *vma_next;

	DRM_DEBUG("\n");

	if (dev->irq) gamma_irq_uninstall(dev);

	down(&dev->struct_sem);
	del_timer(&dev->timer);

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

	if (dev->unique) {
		drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
		dev->unique = NULL;
		dev->unique_len = 0;
	}
				/* Clear pid list */
	for (i = 0; i < DRM_HASH_SIZE; i++) {
		for (pt = dev->magiclist[i].head; pt; pt = next) {
			next = pt->next;
			drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
		}
		dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
	}

				/* Clear vma list (only built for debugging) */
	if (dev->vmalist) {
		for (vma = dev->vmalist; vma; vma = vma_next) {
			vma_next = vma->next;
			drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
		}
		dev->vmalist = NULL;
	}

				/* Clear map area and mtrr information */
	if (dev->maplist) {
		for (i = 0; i < dev->map_count; i++) {
			map = dev->maplist[i];
			switch (map->type) {
			case _DRM_REGISTERS:
			case _DRM_FRAME_BUFFER:
#ifdef CONFIG_MTRR
				if (map->mtrr >= 0) {
					int retcode;
					retcode = mtrr_del(map->mtrr,
							   map->offset,
							   map->size);
					DRM_DEBUG("mtrr_del = %d\n", retcode);
				}
#endif
				drm_ioremapfree(map->handle, map->size);
				break;
			case _DRM_SHM:
				drm_free_pages((unsigned long)map->handle,
					       drm_order(map->size)
					       - PAGE_SHIFT,
					       DRM_MEM_SAREA);
				break;
			case _DRM_AGP:
				/* Do nothing here, because this is all
                                   handled in the AGP/GART driver. */
				break;
			}
			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
		}
		drm_free(dev->maplist,
			 dev->map_count * sizeof(*dev->maplist),
			 DRM_MEM_MAPS);
		dev->maplist   = NULL;
		dev->map_count = 0;
	}

	if (dev->queuelist) {
		for (i = 0; i < dev->queue_count; i++) {
			drm_waitlist_destroy(&dev->queuelist[i]->waitlist);
			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;
	}

	drm_dma_takedown(dev);

	dev->queue_count     = 0;
	if (dev->lock.hw_lock) {
		dev->lock.hw_lock    = NULL; /* SHM removed */
		dev->lock.pid	     = 0;
		wake_up_interruptible(&dev->lock.lock_queue);
	}
	up(&dev->struct_sem);

	return 0;
}

int gamma_found(void)
{
	return devices;
}

int gamma_find_devices(void)
{
	struct pci_dev *d = NULL, *one = NULL, *two = NULL;

	d = pci_find_device(PCI_VENDOR_ID_3DLABS,PCI_DEVICE_ID_3DLABS_GAMMA,d);
	if (!d) return 0;

	one = pci_find_device(PCI_VENDOR_ID_3DLABS,PCI_DEVICE_ID_3DLABS_MX,d);
	if (!one) return 0;

	/* Make sure it's on the same card, if not - no MX's found */
	if (PCI_SLOT(d->devfn) != PCI_SLOT(one->devfn)) return 0;

	two = pci_find_device(PCI_VENDOR_ID_3DLABS,PCI_DEVICE_ID_3DLABS_MX,one);
	if (!two) return 1;

	/* Make sure it's on the same card, if not - only 1 MX found */
	if (PCI_SLOT(d->devfn) != PCI_SLOT(two->devfn)) return 1;

	/* Two MX's found - we don't currently support more than 2 */
	return 2;
}

/* gamma_init is called via init_module at module load time, or via
 * linux/init/main.c (this is not currently supported). */

static int gamma_init(void)
{
	int		      retcode;
	drm_device_t	      *dev = &gamma_device;

	DRM_DEBUG("\n");

	memset((void *)dev, 0, sizeof(*dev));
	dev->count_lock	  = SPIN_LOCK_UNLOCKED;
	sema_init(&dev->struct_sem, 1);

#ifdef MODULE
	drm_parse_options(gamma);
#endif
	devices = gamma_find_devices();
	if (devices == 0) return -1;

	if ((retcode = misc_register(&gamma_misc))) {
		DRM_ERROR("Cannot register \"%s\"\n", GAMMA_NAME);
		return retcode;
	}
	dev->device = MKDEV(MISC_MAJOR, gamma_misc.minor);
	dev->name   = GAMMA_NAME;

	drm_mem_init();
	drm_proc_init(dev);

	DRM_INFO("Initialized %s %d.%d.%d %s on minor %d with %d MX devices\n",
		 GAMMA_NAME,
		 GAMMA_MAJOR,
		 GAMMA_MINOR,
		 GAMMA_PATCHLEVEL,
		 GAMMA_DATE,
		 gamma_misc.minor,
		 devices);

	return 0;
}

/* gamma_cleanup is called via cleanup_module at module unload time. */

static void gamma_cleanup(void)
{
	drm_device_t	      *dev = &gamma_device;

	DRM_DEBUG("\n");

	drm_proc_cleanup();
	if (misc_deregister(&gamma_misc)) {
		DRM_ERROR("Cannot unload module\n");
	} else {
		DRM_INFO("Module unloaded\n");
	}
	gamma_takedown(dev);
}

module_init(gamma_init);
module_exit(gamma_cleanup);


int gamma_version(struct inode *inode, struct file *filp, unsigned int cmd,
		  unsigned long arg)
{
	drm_version_t version;
	int	      len;

	if (copy_from_user(&version,
			   (drm_version_t *)arg,
			   sizeof(version)))
		return -EFAULT;

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

	version.version_major	   = GAMMA_MAJOR;
	version.version_minor	   = GAMMA_MINOR;
	version.version_patchlevel = GAMMA_PATCHLEVEL;

	DRM_COPY(version.name, GAMMA_NAME);
	DRM_COPY(version.date, GAMMA_DATE);
	DRM_COPY(version.desc, GAMMA_DESC);

	if (copy_to_user((drm_version_t *)arg,
			 &version,
			 sizeof(version)))
		return -EFAULT;
	return 0;
}

int gamma_open(struct inode *inode, struct file *filp)
{
	drm_device_t  *dev    = &gamma_device;
	int	      retcode = 0;

	DRM_DEBUG("open_count = %d\n", dev->open_count);
	if (!(retcode = drm_open_helper(inode, filp, dev))) {
#if LINUX_VERSION_CODE < 0x020333
		MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
		atomic_inc(&dev->total_open);
		spin_lock(&dev->count_lock);
		if (!dev->open_count++) {
			spin_unlock(&dev->count_lock);
			return gamma_setup(dev);
		}
		spin_unlock(&dev->count_lock);
	}
	return retcode;
}

int gamma_release(struct inode *inode, struct file *filp)
{
	drm_file_t    *priv   = filp->private_data;
	drm_device_t  *dev;
	int	      retcode = 0;

	lock_kernel();
	dev = priv->dev;

	DRM_DEBUG("open_count = %d\n", dev->open_count);
	if (!(retcode = drm_release(inode, filp))) {
#if LINUX_VERSION_CODE < 0x020333
		MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
#endif
		atomic_inc(&dev->total_close);
		spin_lock(&dev->count_lock);
		if (!--dev->open_count) {
			if (atomic_read(&dev->ioctl_count) || dev->blocked) {
				DRM_ERROR("Device busy: %d %d\n",
					  atomic_read(&dev->ioctl_count),
					  dev->blocked);
				spin_unlock(&dev->count_lock);
				unlock_kernel();
				return -EBUSY;
			}
			spin_unlock(&dev->count_lock);
			unlock_kernel();
			return gamma_takedown(dev);
		}
		spin_unlock(&dev->count_lock);
	}
	unlock_kernel();
	return retcode;
}

/* drm_ioctl is called whenever a process performs an ioctl on /dev/drm. */

int gamma_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
		unsigned long arg)
{
	int		 nr	 = DRM_IOCTL_NR(cmd);
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->dev;
	int		 retcode = 0;
	drm_ioctl_desc_t *ioctl;
	drm_ioctl_t	 *func;

	atomic_inc(&dev->ioctl_count);
	atomic_inc(&dev->total_ioctl);
	++priv->ioctl_count;

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

	if (nr >= GAMMA_IOCTL_COUNT) {
		retcode = -EINVAL;
	} else {
		ioctl	  = &gamma_ioctls[nr];
		func	  = ioctl->func;

		if (!func) {
			DRM_DEBUG("no function\n");
			retcode = -EINVAL;
		} else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
			    || (ioctl->auth_needed && !priv->authenticated)) {
			retcode = -EACCES;
		} else {
			retcode = (func)(inode, filp, cmd, arg);
		}
	}

	atomic_dec(&dev->ioctl_count);
	return retcode;
}


int gamma_unlock(struct inode *inode, struct file *filp, unsigned int cmd,
		 unsigned long arg)
{
	drm_file_t	  *priv	  = filp->private_data;
	drm_device_t	  *dev	  = priv->dev;
	drm_lock_t	  lock;

	if (copy_from_user(&lock, (drm_lock_t *)arg, sizeof(lock)))
		return -EFAULT;

	if (lock.context == DRM_KERNEL_CONTEXT) {
		DRM_ERROR("Process %d using kernel context %d\n",
			  current->pid, lock.context);
		return -EINVAL;
	}

	DRM_DEBUG("%d frees lock (%d holds)\n",
		  lock.context,
		  _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
	atomic_inc(&dev->total_unlocks);
	if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
		atomic_inc(&dev->total_contends);
	drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
	gamma_dma_schedule(dev, 1);
	if (!dev->context_flag) {
		if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
				  DRM_KERNEL_CONTEXT)) {
			DRM_ERROR("\n");
		}
	}
#if DRM_DMA_HISTOGRAM
	atomic_inc(&dev->histo.lhld[drm_histogram_slot(get_cycles()
						       - dev->lck_start)]);
#endif

	unblock_all_signals();
	return 0;
}