summaryrefslogtreecommitdiffstats
path: root/drivers/misc/habanalabs/device.c
blob: aef4de36b7aaeff8086d8d5f1f9ad2dde7e2bbfe (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
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
// SPDX-License-Identifier: GPL-2.0

/*
 * Copyright 2016-2019 HabanaLabs, Ltd.
 * All Rights Reserved.
 */

#define pr_fmt(fmt)			"habanalabs: " fmt

#include "habanalabs.h"

#include <linux/pci.h>
#include <linux/sched/signal.h>
#include <linux/hwmon.h>
#include <uapi/misc/habanalabs.h>

#define HL_PLDM_PENDING_RESET_PER_SEC	(HL_PENDING_RESET_PER_SEC * 10)

bool hl_device_disabled_or_in_reset(struct hl_device *hdev)
{
	if ((hdev->disabled) || (atomic_read(&hdev->in_reset)))
		return true;
	else
		return false;
}

enum hl_device_status hl_device_status(struct hl_device *hdev)
{
	enum hl_device_status status;

	if (hdev->disabled)
		status = HL_DEVICE_STATUS_MALFUNCTION;
	else if (atomic_read(&hdev->in_reset))
		status = HL_DEVICE_STATUS_IN_RESET;
	else
		status = HL_DEVICE_STATUS_OPERATIONAL;

	return status;
}

static void hpriv_release(struct kref *ref)
{
	struct hl_fpriv *hpriv;
	struct hl_device *hdev;

	hpriv = container_of(ref, struct hl_fpriv, refcount);

	hdev = hpriv->hdev;

	put_pid(hpriv->taskpid);

	hl_debugfs_remove_file(hpriv);

	mutex_destroy(&hpriv->restore_phase_mutex);

	mutex_lock(&hdev->fpriv_list_lock);
	list_del(&hpriv->dev_node);
	hdev->compute_ctx = NULL;
	mutex_unlock(&hdev->fpriv_list_lock);

	kfree(hpriv);
}

void hl_hpriv_get(struct hl_fpriv *hpriv)
{
	kref_get(&hpriv->refcount);
}

void hl_hpriv_put(struct hl_fpriv *hpriv)
{
	kref_put(&hpriv->refcount, hpriv_release);
}

/*
 * hl_device_release - release function for habanalabs device
 *
 * @inode: pointer to inode structure
 * @filp: pointer to file structure
 *
 * Called when process closes an habanalabs device
 */
static int hl_device_release(struct inode *inode, struct file *filp)
{
	struct hl_fpriv *hpriv = filp->private_data;

	hl_cb_mgr_fini(hpriv->hdev, &hpriv->cb_mgr);
	hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);

	filp->private_data = NULL;

	hl_hpriv_put(hpriv);

	return 0;
}

static int hl_device_release_ctrl(struct inode *inode, struct file *filp)
{
	struct hl_fpriv *hpriv = filp->private_data;
	struct hl_device *hdev;

	filp->private_data = NULL;

	hdev = hpriv->hdev;

	mutex_lock(&hdev->fpriv_list_lock);
	list_del(&hpriv->dev_node);
	mutex_unlock(&hdev->fpriv_list_lock);

	kfree(hpriv);

	return 0;
}

/*
 * hl_mmap - mmap function for habanalabs device
 *
 * @*filp: pointer to file structure
 * @*vma: pointer to vm_area_struct of the process
 *
 * Called when process does an mmap on habanalabs device. Call the device's mmap
 * function at the end of the common code.
 */
static int hl_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct hl_fpriv *hpriv = filp->private_data;

	if ((vma->vm_pgoff & HL_MMAP_CB_MASK) == HL_MMAP_CB_MASK) {
		vma->vm_pgoff ^= HL_MMAP_CB_MASK;
		return hl_cb_mmap(hpriv, vma);
	}

	return -EINVAL;
}

static const struct file_operations hl_ops = {
	.owner = THIS_MODULE,
	.open = hl_device_open,
	.release = hl_device_release,
	.mmap = hl_mmap,
	.unlocked_ioctl = hl_ioctl,
	.compat_ioctl = hl_ioctl
};

static const struct file_operations hl_ctrl_ops = {
	.owner = THIS_MODULE,
	.open = hl_device_open_ctrl,
	.release = hl_device_release_ctrl,
	.unlocked_ioctl = hl_ioctl_control,
	.compat_ioctl = hl_ioctl_control
};

static void device_release_func(struct device *dev)
{
	kfree(dev);
}

/*
 * device_init_cdev - Initialize cdev and device for habanalabs device
 *
 * @hdev: pointer to habanalabs device structure
 * @hclass: pointer to the class object of the device
 * @minor: minor number of the specific device
 * @fpos: file operations to install for this device
 * @name: name of the device as it will appear in the filesystem
 * @cdev: pointer to the char device object that will be initialized
 * @dev: pointer to the device object that will be initialized
 *
 * Initialize a cdev and a Linux device for habanalabs's device.
 */
static int device_init_cdev(struct hl_device *hdev, struct class *hclass,
				int minor, const struct file_operations *fops,
				char *name, struct cdev *cdev,
				struct device **dev)
{
	cdev_init(cdev, fops);
	cdev->owner = THIS_MODULE;

	*dev = kzalloc(sizeof(**dev), GFP_KERNEL);
	if (!*dev)
		return -ENOMEM;

	device_initialize(*dev);
	(*dev)->devt = MKDEV(hdev->major, minor);
	(*dev)->class = hclass;
	(*dev)->release = device_release_func;
	dev_set_drvdata(*dev, hdev);
	dev_set_name(*dev, "%s", name);

	return 0;
}

static int device_cdev_sysfs_add(struct hl_device *hdev)
{
	int rc;

	rc = cdev_device_add(&hdev->cdev, hdev->dev);
	if (rc) {
		dev_err(hdev->dev,
			"failed to add a char device to the system\n");
		return rc;
	}

	rc = cdev_device_add(&hdev->cdev_ctrl, hdev->dev_ctrl);
	if (rc) {
		dev_err(hdev->dev,
			"failed to add a control char device to the system\n");
		goto delete_cdev_device;
	}

	/* hl_sysfs_init() must be done after adding the device to the system */
	rc = hl_sysfs_init(hdev);
	if (rc) {
		dev_err(hdev->dev, "failed to initialize sysfs\n");
		goto delete_ctrl_cdev_device;
	}

	hdev->cdev_sysfs_created = true;

	return 0;

delete_ctrl_cdev_device:
	cdev_device_del(&hdev->cdev_ctrl, hdev->dev_ctrl);
delete_cdev_device:
	cdev_device_del(&hdev->cdev, hdev->dev);
	return rc;
}

static void device_cdev_sysfs_del(struct hl_device *hdev)
{
	/* device_release() won't be called so must free devices explicitly */
	if (!hdev->cdev_sysfs_created) {
		kfree(hdev->dev_ctrl);
		kfree(hdev->dev);
		return;
	}

	hl_sysfs_fini(hdev);
	cdev_device_del(&hdev->cdev_ctrl, hdev->dev_ctrl);
	cdev_device_del(&hdev->cdev, hdev->dev);
}

/*
 * device_early_init - do some early initialization for the habanalabs device
 *
 * @hdev: pointer to habanalabs device structure
 *
 * Install the relevant function pointers and call the early_init function,
 * if such a function exists
 */
static int device_early_init(struct hl_device *hdev)
{
	int rc;

	switch (hdev->asic_type) {
	case ASIC_GOYA:
		goya_set_asic_funcs(hdev);
		strlcpy(hdev->asic_name, "GOYA", sizeof(hdev->asic_name));
		break;
	default:
		dev_err(hdev->dev, "Unrecognized ASIC type %d\n",
			hdev->asic_type);
		return -EINVAL;
	}

	rc = hdev->asic_funcs->early_init(hdev);
	if (rc)
		return rc;

	rc = hl_asid_init(hdev);
	if (rc)
		goto early_fini;

	hdev->cq_wq = alloc_workqueue("hl-free-jobs", WQ_UNBOUND, 0);
	if (hdev->cq_wq == NULL) {
		dev_err(hdev->dev, "Failed to allocate CQ workqueue\n");
		rc = -ENOMEM;
		goto asid_fini;
	}

	hdev->eq_wq = alloc_workqueue("hl-events", WQ_UNBOUND, 0);
	if (hdev->eq_wq == NULL) {
		dev_err(hdev->dev, "Failed to allocate EQ workqueue\n");
		rc = -ENOMEM;
		goto free_cq_wq;
	}

	hdev->hl_chip_info = kzalloc(sizeof(struct hwmon_chip_info),
					GFP_KERNEL);
	if (!hdev->hl_chip_info) {
		rc = -ENOMEM;
		goto free_eq_wq;
	}

	hdev->idle_busy_ts_arr = kmalloc_array(HL_IDLE_BUSY_TS_ARR_SIZE,
					sizeof(struct hl_device_idle_busy_ts),
					(GFP_KERNEL | __GFP_ZERO));
	if (!hdev->idle_busy_ts_arr) {
		rc = -ENOMEM;
		goto free_chip_info;
	}

	hl_cb_mgr_init(&hdev->kernel_cb_mgr);

	mutex_init(&hdev->send_cpu_message_lock);
	mutex_init(&hdev->debug_lock);
	mutex_init(&hdev->mmu_cache_lock);
	INIT_LIST_HEAD(&hdev->hw_queues_mirror_list);
	spin_lock_init(&hdev->hw_queues_mirror_lock);
	INIT_LIST_HEAD(&hdev->fpriv_list);
	mutex_init(&hdev->fpriv_list_lock);
	atomic_set(&hdev->in_reset, 0);

	return 0;

free_chip_info:
	kfree(hdev->hl_chip_info);
free_eq_wq:
	destroy_workqueue(hdev->eq_wq);
free_cq_wq:
	destroy_workqueue(hdev->cq_wq);
asid_fini:
	hl_asid_fini(hdev);
early_fini:
	if (hdev->asic_funcs->early_fini)
		hdev->asic_funcs->early_fini(hdev);

	return rc;
}

/*
 * device_early_fini - finalize all that was done in device_early_init
 *
 * @hdev: pointer to habanalabs device structure
 *
 */
static void device_early_fini(struct hl_device *hdev)
{
	mutex_destroy(&hdev->mmu_cache_lock);
	mutex_destroy(&hdev->debug_lock);
	mutex_destroy(&hdev->send_cpu_message_lock);

	mutex_destroy(&hdev->fpriv_list_lock);

	hl_cb_mgr_fini(hdev, &hdev->kernel_cb_mgr);

	kfree(hdev->idle_busy_ts_arr);
	kfree(hdev->hl_chip_info);

	destroy_workqueue(hdev->eq_wq);
	destroy_workqueue(hdev->cq_wq);

	hl_asid_fini(hdev);

	if (hdev->asic_funcs->early_fini)
		hdev->asic_funcs->early_fini(hdev);
}

static void set_freq_to_low_job(struct work_struct *work)
{
	struct hl_device *hdev = container_of(work, struct hl_device,
						work_freq.work);

	mutex_lock(&hdev->fpriv_list_lock);

	if (!hdev->compute_ctx)
		hl_device_set_frequency(hdev, PLL_LOW);

	mutex_unlock(&hdev->fpriv_list_lock);

	schedule_delayed_work(&hdev->work_freq,
			usecs_to_jiffies(HL_PLL_LOW_JOB_FREQ_USEC));
}

static void hl_device_heartbeat(struct work_struct *work)
{
	struct hl_device *hdev = container_of(work, struct hl_device,
						work_heartbeat.work);

	if (hl_device_disabled_or_in_reset(hdev))
		goto reschedule;

	if (!hdev->asic_funcs->send_heartbeat(hdev))
		goto reschedule;

	dev_err(hdev->dev, "Device heartbeat failed!\n");
	hl_device_reset(hdev, true, false);

	return;

reschedule:
	schedule_delayed_work(&hdev->work_heartbeat,
			usecs_to_jiffies(HL_HEARTBEAT_PER_USEC));
}

/*
 * device_late_init - do late stuff initialization for the habanalabs device
 *
 * @hdev: pointer to habanalabs device structure
 *
 * Do stuff that either needs the device H/W queues to be active or needs
 * to happen after all the rest of the initialization is finished
 */
static int device_late_init(struct hl_device *hdev)
{
	int rc;

	if (hdev->asic_funcs->late_init) {
		rc = hdev->asic_funcs->late_init(hdev);
		if (rc) {
			dev_err(hdev->dev,
				"failed late initialization for the H/W\n");
			return rc;
		}
	}

	hdev->high_pll = hdev->asic_prop.high_pll;

	/* force setting to low frequency */
	hdev->curr_pll_profile = PLL_LOW;

	if (hdev->pm_mng_profile == PM_AUTO)
		hdev->asic_funcs->set_pll_profile(hdev, PLL_LOW);
	else
		hdev->asic_funcs->set_pll_profile(hdev, PLL_LAST);

	INIT_DELAYED_WORK(&hdev->work_freq, set_freq_to_low_job);
	schedule_delayed_work(&hdev->work_freq,
	usecs_to_jiffies(HL_PLL_LOW_JOB_FREQ_USEC));

	if (hdev->heartbeat) {
		INIT_DELAYED_WORK(&hdev->work_heartbeat, hl_device_heartbeat);
		schedule_delayed_work(&hdev->work_heartbeat,
				usecs_to_jiffies(HL_HEARTBEAT_PER_USEC));
	}

	hdev->late_init_done = true;

	return 0;
}

/*
 * device_late_fini - finalize all that was done in device_late_init
 *
 * @hdev: pointer to habanalabs device structure
 *
 */
static void device_late_fini(struct hl_device *hdev)
{
	if (!hdev->late_init_done)
		return;

	cancel_delayed_work_sync(&hdev->work_freq);
	if (hdev->heartbeat)
		cancel_delayed_work_sync(&hdev->work_heartbeat);

	if (hdev->asic_funcs->late_fini)
		hdev->asic_funcs->late_fini(hdev);

	hdev->late_init_done = false;
}

uint32_t hl_device_utilization(struct hl_device *hdev, uint32_t period_ms)
{
	struct hl_device_idle_busy_ts *ts;
	ktime_t zero_ktime, curr = ktime_get();
	u32 overlap_cnt = 0, last_index = hdev->idle_busy_ts_idx;
	s64 period_us, last_start_us, last_end_us, last_busy_time_us,
		total_busy_time_us = 0, total_busy_time_ms;

	zero_ktime = ktime_set(0, 0);
	period_us = period_ms * USEC_PER_MSEC;
	ts = &hdev->idle_busy_ts_arr[last_index];

	/* check case that device is currently in idle */
	if (!ktime_compare(ts->busy_to_idle_ts, zero_ktime) &&
			!ktime_compare(ts->idle_to_busy_ts, zero_ktime)) {

		last_index--;
		/* Handle case idle_busy_ts_idx was 0 */
		if (last_index > HL_IDLE_BUSY_TS_ARR_SIZE)
			last_index = HL_IDLE_BUSY_TS_ARR_SIZE - 1;

		ts = &hdev->idle_busy_ts_arr[last_index];
	}

	while (overlap_cnt < HL_IDLE_BUSY_TS_ARR_SIZE) {
		/* Check if we are in last sample case. i.e. if the sample
		 * begun before the sampling period. This could be a real
		 * sample or 0 so need to handle both cases
		 */
		last_start_us = ktime_to_us(
				ktime_sub(curr, ts->idle_to_busy_ts));

		if (last_start_us > period_us) {

			/* First check two cases:
			 * 1. If the device is currently busy
			 * 2. If the device was idle during the whole sampling
			 *    period
			 */

			if (!ktime_compare(ts->busy_to_idle_ts, zero_ktime)) {
				/* Check if the device is currently busy */
				if (ktime_compare(ts->idle_to_busy_ts,
						zero_ktime))
					return 100;

				/* We either didn't have any activity or we
				 * reached an entry which is 0. Either way,
				 * exit and return what was accumulated so far
				 */
				break;
			}

			/* If sample has finished, check it is relevant */
			last_end_us = ktime_to_us(
					ktime_sub(curr, ts->busy_to_idle_ts));

			if (last_end_us > period_us)
				break;

			/* It is relevant so add it but with adjustment */
			last_busy_time_us = ktime_to_us(
						ktime_sub(ts->busy_to_idle_ts,
						ts->idle_to_busy_ts));
			total_busy_time_us += last_busy_time_us -
					(last_start_us - period_us);
			break;
		}

		/* Check if the sample is finished or still open */
		if (ktime_compare(ts->busy_to_idle_ts, zero_ktime))
			last_busy_time_us = ktime_to_us(
						ktime_sub(ts->busy_to_idle_ts,
						ts->idle_to_busy_ts));
		else
			last_busy_time_us = ktime_to_us(
					ktime_sub(curr, ts->idle_to_busy_ts));

		total_busy_time_us += last_busy_time_us;

		last_index--;
		/* Handle case idle_busy_ts_idx was 0 */
		if (last_index > HL_IDLE_BUSY_TS_ARR_SIZE)
			last_index = HL_IDLE_BUSY_TS_ARR_SIZE - 1;

		ts = &hdev->idle_busy_ts_arr[last_index];

		overlap_cnt++;
	}

	total_busy_time_ms = DIV_ROUND_UP_ULL(total_busy_time_us,
						USEC_PER_MSEC);

	return DIV_ROUND_UP_ULL(total_busy_time_ms * 100, period_ms);
}

/*
 * hl_device_set_frequency - set the frequency of the device
 *
 * @hdev: pointer to habanalabs device structure
 * @freq: the new frequency value
 *
 * Change the frequency if needed. This function has no protection against
 * concurrency, therefore it is assumed that the calling function has protected
 * itself against the case of calling this function from multiple threads with
 * different values
 *
 * Returns 0 if no change was done, otherwise returns 1
 */
int hl_device_set_frequency(struct hl_device *hdev, enum hl_pll_frequency freq)
{
	if ((hdev->pm_mng_profile == PM_MANUAL) ||
			(hdev->curr_pll_profile == freq))
		return 0;

	dev_dbg(hdev->dev, "Changing device frequency to %s\n",
		freq == PLL_HIGH ? "high" : "low");

	hdev->asic_funcs->set_pll_profile(hdev, freq);

	hdev->curr_pll_profile = freq;

	return 1;
}

int hl_device_set_debug_mode(struct hl_device *hdev, bool enable)
{
	int rc = 0;

	mutex_lock(&hdev->debug_lock);

	if (!enable) {
		if (!hdev->in_debug) {
			dev_err(hdev->dev,
				"Failed to disable debug mode because device was not in debug mode\n");
			rc = -EFAULT;
			goto out;
		}

		if (!hdev->hard_reset_pending)
			hdev->asic_funcs->halt_coresight(hdev);

		hdev->in_debug = 0;

		goto out;
	}

	if (hdev->in_debug) {
		dev_err(hdev->dev,
			"Failed to enable debug mode because device is already in debug mode\n");
		rc = -EFAULT;
		goto out;
	}

	hdev->in_debug = 1;

out:
	mutex_unlock(&hdev->debug_lock);

	return rc;
}

/*
 * hl_device_suspend - initiate device suspend
 *
 * @hdev: pointer to habanalabs device structure
 *
 * Puts the hw in the suspend state (all asics).
 * Returns 0 for success or an error on failure.
 * Called at driver suspend.
 */
int hl_device_suspend(struct hl_device *hdev)
{
	int rc;

	pci_save_state(hdev->pdev);

	/* Block future CS/VM/JOB completion operations */
	rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
	if (rc) {
		dev_err(hdev->dev, "Can't suspend while in reset\n");
		return -EIO;
	}

	/* This blocks all other stuff that is not blocked by in_reset */
	hdev->disabled = true;

	/*
	 * Flush anyone that is inside the critical section of enqueue
	 * jobs to the H/W
	 */
	hdev->asic_funcs->hw_queues_lock(hdev);
	hdev->asic_funcs->hw_queues_unlock(hdev);

	/* Flush processes that are sending message to CPU */
	mutex_lock(&hdev->send_cpu_message_lock);
	mutex_unlock(&hdev->send_cpu_message_lock);

	rc = hdev->asic_funcs->suspend(hdev);
	if (rc)
		dev_err(hdev->dev,
			"Failed to disable PCI access of device CPU\n");

	/* Shut down the device */
	pci_disable_device(hdev->pdev);
	pci_set_power_state(hdev->pdev, PCI_D3hot);

	return 0;
}

/*
 * hl_device_resume - initiate device resume
 *
 * @hdev: pointer to habanalabs device structure
 *
 * Bring the hw back to operating state (all asics).
 * Returns 0 for success or an error on failure.
 * Called at driver resume.
 */
int hl_device_resume(struct hl_device *hdev)
{
	int rc;

	pci_set_power_state(hdev->pdev, PCI_D0);
	pci_restore_state(hdev->pdev);
	rc = pci_enable_device_mem(hdev->pdev);
	if (rc) {
		dev_err(hdev->dev,
			"Failed to enable PCI device in resume\n");
		return rc;
	}

	pci_set_master(hdev->pdev);

	rc = hdev->asic_funcs->resume(hdev);
	if (rc) {
		dev_err(hdev->dev, "Failed to resume device after suspend\n");
		goto disable_device;
	}


	hdev->disabled = false;
	atomic_set(&hdev->in_reset, 0);

	rc = hl_device_reset(hdev, true, false);
	if (rc) {
		dev_err(hdev->dev, "Failed to reset device during resume\n");
		goto disable_device;
	}

	return 0;

disable_device:
	pci_clear_master(hdev->pdev);
	pci_disable_device(hdev->pdev);

	return rc;
}

static void device_kill_open_processes(struct hl_device *hdev)
{
	u16 pending_total, pending_cnt;
	struct hl_fpriv	*hpriv;
	struct task_struct *task = NULL;

	if (hdev->pldm)
		pending_total = HL_PLDM_PENDING_RESET_PER_SEC;
	else
		pending_total = HL_PENDING_RESET_PER_SEC;

	/* Giving time for user to close FD, and for processes that are inside
	 * hl_device_open to finish
	 */
	if (!list_empty(&hdev->fpriv_list))
		ssleep(1);

	mutex_lock(&hdev->fpriv_list_lock);

	/* This section must be protected because we are dereferencing
	 * pointers that are freed if the process exits
	 */
	list_for_each_entry(hpriv, &hdev->fpriv_list, dev_node) {
		task = get_pid_task(hpriv->taskpid, PIDTYPE_PID);
		if (task) {
			dev_info(hdev->dev, "Killing user process pid=%d\n",
				task_pid_nr(task));
			send_sig(SIGKILL, task, 1);
			usleep_range(1000, 10000);

			put_task_struct(task);
		}
	}

	mutex_unlock(&hdev->fpriv_list_lock);

	/* We killed the open users, but because the driver cleans up after the
	 * user contexts are closed (e.g. mmu mappings), we need to wait again
	 * to make sure the cleaning phase is finished before continuing with
	 * the reset
	 */

	pending_cnt = pending_total;

	while ((!list_empty(&hdev->fpriv_list)) && (pending_cnt)) {
		dev_info(hdev->dev,
			"Waiting for all unmap operations to finish before hard reset\n");

		pending_cnt--;

		ssleep(1);
	}

	if (!list_empty(&hdev->fpriv_list))
		dev_crit(hdev->dev,
			"Going to hard reset with open user contexts\n");
}

static void device_hard_reset_pending(struct work_struct *work)
{
	struct hl_device_reset_work *device_reset_work =
		container_of(work, struct hl_device_reset_work, reset_work);
	struct hl_device *hdev = device_reset_work->hdev;

	hl_device_reset(hdev, true, true);

	kfree(device_reset_work);
}

/*
 * hl_device_reset - reset the device
 *
 * @hdev: pointer to habanalabs device structure
 * @hard_reset: should we do hard reset to all engines or just reset the
 *              compute/dma engines
 *
 * Block future CS and wait for pending CS to be enqueued
 * Call ASIC H/W fini
 * Flush all completions
 * Re-initialize all internal data structures
 * Call ASIC H/W init, late_init
 * Test queues
 * Enable device
 *
 * Returns 0 for success or an error on failure.
 */
int hl_device_reset(struct hl_device *hdev, bool hard_reset,
			bool from_hard_reset_thread)
{
	int i, rc;

	if (!hdev->init_done) {
		dev_err(hdev->dev,
			"Can't reset before initialization is done\n");
		return 0;
	}

	/*
	 * Prevent concurrency in this function - only one reset should be
	 * done at any given time. Only need to perform this if we didn't
	 * get from the dedicated hard reset thread
	 */
	if (!from_hard_reset_thread) {
		/* Block future CS/VM/JOB completion operations */
		rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
		if (rc)
			return 0;

		/* This also blocks future CS/VM/JOB completion operations */
		hdev->disabled = true;

		/* Flush anyone that is inside the critical section of enqueue
		 * jobs to the H/W
		 */
		hdev->asic_funcs->hw_queues_lock(hdev);
		hdev->asic_funcs->hw_queues_unlock(hdev);

		/* Flush anyone that is inside device open */
		mutex_lock(&hdev->fpriv_list_lock);
		mutex_unlock(&hdev->fpriv_list_lock);

		dev_err(hdev->dev, "Going to RESET device!\n");
	}

again:
	if ((hard_reset) && (!from_hard_reset_thread)) {
		struct hl_device_reset_work *device_reset_work;

		hdev->hard_reset_pending = true;

		device_reset_work = kzalloc(sizeof(*device_reset_work),
						GFP_ATOMIC);
		if (!device_reset_work) {
			rc = -ENOMEM;
			goto out_err;
		}

		/*
		 * Because the reset function can't run from interrupt or
		 * from heartbeat work, we need to call the reset function
		 * from a dedicated work
		 */
		INIT_WORK(&device_reset_work->reset_work,
				device_hard_reset_pending);
		device_reset_work->hdev = hdev;
		schedule_work(&device_reset_work->reset_work);

		return 0;
	}

	if (hard_reset) {
		device_late_fini(hdev);

		/*
		 * Now that the heartbeat thread is closed, flush processes
		 * which are sending messages to CPU
		 */
		mutex_lock(&hdev->send_cpu_message_lock);
		mutex_unlock(&hdev->send_cpu_message_lock);
	}

	/*
	 * Halt the engines and disable interrupts so we won't get any more
	 * completions from H/W and we won't have any accesses from the
	 * H/W to the host machine
	 */
	hdev->asic_funcs->halt_engines(hdev, hard_reset);

	/* Go over all the queues, release all CS and their jobs */
	hl_cs_rollback_all(hdev);

	if (hard_reset) {
		/* Kill processes here after CS rollback. This is because the
		 * process can't really exit until all its CSs are done, which
		 * is what we do in cs rollback
		 */
		device_kill_open_processes(hdev);

		/* Flush the Event queue workers to make sure no other thread is
		 * reading or writing to registers during the reset
		 */
		flush_workqueue(hdev->eq_wq);
	}

	/* Release kernel context */
	if ((hard_reset) && (hl_ctx_put(hdev->kernel_ctx) == 1))
		hdev->kernel_ctx = NULL;

	/* Reset the H/W. It will be in idle state after this returns */
	hdev->asic_funcs->hw_fini(hdev, hard_reset);

	if (hard_reset) {
		hl_vm_fini(hdev);
		hl_mmu_fini(hdev);
		hl_eq_reset(hdev, &hdev->event_queue);
	}

	/* Re-initialize PI,CI to 0 in all queues (hw queue, cq) */
	hl_hw_queue_reset(hdev, hard_reset);
	for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++)
		hl_cq_reset(hdev, &hdev->completion_queue[i]);

	hdev->idle_busy_ts_idx = 0;
	hdev->idle_busy_ts_arr[0].busy_to_idle_ts = ktime_set(0, 0);
	hdev->idle_busy_ts_arr[0].idle_to_busy_ts = ktime_set(0, 0);

	if (hdev->cs_active_cnt)
		dev_crit(hdev->dev, "CS active cnt %d is not 0 during reset\n",
			hdev->cs_active_cnt);

	mutex_lock(&hdev->fpriv_list_lock);

	/* Make sure the context switch phase will run again */
	if (hdev->compute_ctx) {
		atomic_set(&hdev->compute_ctx->thread_ctx_switch_token, 1);
		hdev->compute_ctx->thread_ctx_switch_wait_token = 0;
	}

	mutex_unlock(&hdev->fpriv_list_lock);

	/* Finished tear-down, starting to re-initialize */

	if (hard_reset) {
		hdev->device_cpu_disabled = false;
		hdev->hard_reset_pending = false;

		if (hdev->kernel_ctx) {
			dev_crit(hdev->dev,
				"kernel ctx was alive during hard reset, something is terribly wrong\n");
			rc = -EBUSY;
			goto out_err;
		}

		rc = hl_mmu_init(hdev);
		if (rc) {
			dev_err(hdev->dev,
				"Failed to initialize MMU S/W after hard reset\n");
			goto out_err;
		}

		/* Allocate the kernel context */
		hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx),
						GFP_KERNEL);
		if (!hdev->kernel_ctx) {
			rc = -ENOMEM;
			goto out_err;
		}

		hdev->compute_ctx = NULL;

		rc = hl_ctx_init(hdev, hdev->kernel_ctx, true);
		if (rc) {
			dev_err(hdev->dev,
				"failed to init kernel ctx in hard reset\n");
			kfree(hdev->kernel_ctx);
			hdev->kernel_ctx = NULL;
			goto out_err;
		}
	}

	rc = hdev->asic_funcs->hw_init(hdev);
	if (rc) {
		dev_err(hdev->dev,
			"failed to initialize the H/W after reset\n");
		goto out_err;
	}

	hdev->disabled = false;

	/* Check that the communication with the device is working */
	rc = hdev->asic_funcs->test_queues(hdev);
	if (rc) {
		dev_err(hdev->dev,
			"Failed to detect if device is alive after reset\n");
		goto out_err;
	}

	if (hard_reset) {
		rc = device_late_init(hdev);
		if (rc) {
			dev_err(hdev->dev,
				"Failed late init after hard reset\n");
			goto out_err;
		}

		rc = hl_vm_init(hdev);
		if (rc) {
			dev_err(hdev->dev,
				"Failed to init memory module after hard reset\n");
			goto out_err;
		}

		hl_set_max_power(hdev, hdev->max_power);
	} else {
		rc = hdev->asic_funcs->soft_reset_late_init(hdev);
		if (rc) {
			dev_err(hdev->dev,
				"Failed late init after soft reset\n");
			goto out_err;
		}
	}

	atomic_set(&hdev->in_reset, 0);

	if (hard_reset)
		hdev->hard_reset_cnt++;
	else
		hdev->soft_reset_cnt++;

	dev_warn(hdev->dev, "Successfully finished resetting the device\n");

	return 0;

out_err:
	hdev->disabled = true;

	if (hard_reset) {
		dev_err(hdev->dev,
			"Failed to reset! Device is NOT usable\n");
		hdev->hard_reset_cnt++;
	} else {
		dev_err(hdev->dev,
			"Failed to do soft-reset, trying hard reset\n");
		hdev->soft_reset_cnt++;
		hard_reset = true;
		goto again;
	}

	atomic_set(&hdev->in_reset, 0);

	return rc;
}

/*
 * hl_device_init - main initialization function for habanalabs device
 *
 * @hdev: pointer to habanalabs device structure
 *
 * Allocate an id for the device, do early initialization and then call the
 * ASIC specific initialization functions. Finally, create the cdev and the
 * Linux device to expose it to the user
 */
int hl_device_init(struct hl_device *hdev, struct class *hclass)
{
	int i, rc, cq_ready_cnt;
	char *name;
	bool add_cdev_sysfs_on_err = false;

	name = kasprintf(GFP_KERNEL, "hl%d", hdev->id / 2);
	if (!name) {
		rc = -ENOMEM;
		goto out_disabled;
	}

	/* Initialize cdev and device structures */
	rc = device_init_cdev(hdev, hclass, hdev->id, &hl_ops, name,
				&hdev->cdev, &hdev->dev);

	kfree(name);

	if (rc)
		goto out_disabled;

	name = kasprintf(GFP_KERNEL, "hl_controlD%d", hdev->id / 2);
	if (!name) {
		rc = -ENOMEM;
		goto free_dev;
	}

	/* Initialize cdev and device structures for control device */
	rc = device_init_cdev(hdev, hclass, hdev->id_control, &hl_ctrl_ops,
				name, &hdev->cdev_ctrl, &hdev->dev_ctrl);

	kfree(name);

	if (rc)
		goto free_dev;

	/* Initialize ASIC function pointers and perform early init */
	rc = device_early_init(hdev);
	if (rc)
		goto free_dev_ctrl;

	/*
	 * Start calling ASIC initialization. First S/W then H/W and finally
	 * late init
	 */
	rc = hdev->asic_funcs->sw_init(hdev);
	if (rc)
		goto early_fini;

	/*
	 * Initialize the H/W queues. Must be done before hw_init, because
	 * there the addresses of the kernel queue are being written to the
	 * registers of the device
	 */
	rc = hl_hw_queues_create(hdev);
	if (rc) {
		dev_err(hdev->dev, "failed to initialize kernel queues\n");
		goto sw_fini;
	}

	/*
	 * Initialize the completion queues. Must be done before hw_init,
	 * because there the addresses of the completion queues are being
	 * passed as arguments to request_irq
	 */
	hdev->completion_queue =
			kcalloc(hdev->asic_prop.completion_queues_count,
				sizeof(*hdev->completion_queue), GFP_KERNEL);

	if (!hdev->completion_queue) {
		dev_err(hdev->dev, "failed to allocate completion queues\n");
		rc = -ENOMEM;
		goto hw_queues_destroy;
	}

	for (i = 0, cq_ready_cnt = 0;
			i < hdev->asic_prop.completion_queues_count;
			i++, cq_ready_cnt++) {
		rc = hl_cq_init(hdev, &hdev->completion_queue[i], i);
		if (rc) {
			dev_err(hdev->dev,
				"failed to initialize completion queue\n");
			goto cq_fini;
		}
	}

	/*
	 * Initialize the event queue. Must be done before hw_init,
	 * because there the address of the event queue is being
	 * passed as argument to request_irq
	 */
	rc = hl_eq_init(hdev, &hdev->event_queue);
	if (rc) {
		dev_err(hdev->dev, "failed to initialize event queue\n");
		goto cq_fini;
	}

	/* MMU S/W must be initialized before kernel context is created */
	rc = hl_mmu_init(hdev);
	if (rc) {
		dev_err(hdev->dev, "Failed to initialize MMU S/W structures\n");
		goto eq_fini;
	}

	/* Allocate the kernel context */
	hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx), GFP_KERNEL);
	if (!hdev->kernel_ctx) {
		rc = -ENOMEM;
		goto mmu_fini;
	}

	hdev->compute_ctx = NULL;

	rc = hl_ctx_init(hdev, hdev->kernel_ctx, true);
	if (rc) {
		dev_err(hdev->dev, "failed to initialize kernel context\n");
		kfree(hdev->kernel_ctx);
		goto mmu_fini;
	}

	rc = hl_cb_pool_init(hdev);
	if (rc) {
		dev_err(hdev->dev, "failed to initialize CB pool\n");
		goto release_ctx;
	}

	hl_debugfs_add_device(hdev);

	if (hdev->asic_funcs->get_hw_state(hdev) == HL_DEVICE_HW_STATE_DIRTY) {
		dev_info(hdev->dev,
			"H/W state is dirty, must reset before initializing\n");
		hdev->asic_funcs->halt_engines(hdev, true);
		hdev->asic_funcs->hw_fini(hdev, true);
	}

	/*
	 * From this point, in case of an error, add char devices and create
	 * sysfs nodes as part of the error flow, to allow debugging.
	 */
	add_cdev_sysfs_on_err = true;

	rc = hdev->asic_funcs->hw_init(hdev);
	if (rc) {
		dev_err(hdev->dev, "failed to initialize the H/W\n");
		rc = 0;
		goto out_disabled;
	}

	hdev->disabled = false;

	/* Check that the communication with the device is working */
	rc = hdev->asic_funcs->test_queues(hdev);
	if (rc) {
		dev_err(hdev->dev, "Failed to detect if device is alive\n");
		rc = 0;
		goto out_disabled;
	}

	rc = device_late_init(hdev);
	if (rc) {
		dev_err(hdev->dev, "Failed late initialization\n");
		rc = 0;
		goto out_disabled;
	}

	dev_info(hdev->dev, "Found %s device with %lluGB DRAM\n",
		hdev->asic_name,
		hdev->asic_prop.dram_size / 1024 / 1024 / 1024);

	rc = hl_vm_init(hdev);
	if (rc) {
		dev_err(hdev->dev, "Failed to initialize memory module\n");
		rc = 0;
		goto out_disabled;
	}

	/*
	 * Expose devices and sysfs nodes to user.
	 * From here there is no need to add char devices and create sysfs nodes
	 * in case of an error.
	 */
	add_cdev_sysfs_on_err = false;
	rc = device_cdev_sysfs_add(hdev);
	if (rc) {
		dev_err(hdev->dev,
			"Failed to add char devices and sysfs nodes\n");
		rc = 0;
		goto out_disabled;
	}

	/*
	 * hl_hwmon_init() must be called after device_late_init(), because only
	 * there we get the information from the device about which
	 * hwmon-related sensors the device supports.
	 * Furthermore, it must be done after adding the device to the system.
	 */
	rc = hl_hwmon_init(hdev);
	if (rc) {
		dev_err(hdev->dev, "Failed to initialize hwmon\n");
		rc = 0;
		goto out_disabled;
	}

	dev_notice(hdev->dev,
		"Successfully added device to habanalabs driver\n");

	hdev->init_done = true;

	return 0;

release_ctx:
	if (hl_ctx_put(hdev->kernel_ctx) != 1)
		dev_err(hdev->dev,
			"kernel ctx is still alive on initialization failure\n");
mmu_fini:
	hl_mmu_fini(hdev);
eq_fini:
	hl_eq_fini(hdev, &hdev->event_queue);
cq_fini:
	for (i = 0 ; i < cq_ready_cnt ; i++)
		hl_cq_fini(hdev, &hdev->completion_queue[i]);
	kfree(hdev->completion_queue);
hw_queues_destroy:
	hl_hw_queues_destroy(hdev);
sw_fini:
	hdev->asic_funcs->sw_fini(hdev);
early_fini:
	device_early_fini(hdev);
free_dev_ctrl:
	kfree(hdev->dev_ctrl);
free_dev:
	kfree(hdev->dev);
out_disabled:
	hdev->disabled = true;
	if (add_cdev_sysfs_on_err)
		device_cdev_sysfs_add(hdev);
	if (hdev->pdev)
		dev_err(&hdev->pdev->dev,
			"Failed to initialize hl%d. Device is NOT usable !\n",
			hdev->id / 2);
	else
		pr_err("Failed to initialize hl%d. Device is NOT usable !\n",
			hdev->id / 2);

	return rc;
}

/*
 * hl_device_fini - main tear-down function for habanalabs device
 *
 * @hdev: pointer to habanalabs device structure
 *
 * Destroy the device, call ASIC fini functions and release the id
 */
void hl_device_fini(struct hl_device *hdev)
{
	int i, rc;
	ktime_t timeout;

	dev_info(hdev->dev, "Removing device\n");

	/*
	 * This function is competing with the reset function, so try to
	 * take the reset atomic and if we are already in middle of reset,
	 * wait until reset function is finished. Reset function is designed
	 * to always finish (could take up to a few seconds in worst case).
	 */

	timeout = ktime_add_us(ktime_get(),
				HL_PENDING_RESET_PER_SEC * 1000 * 1000 * 4);
	rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
	while (rc) {
		usleep_range(50, 200);
		rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
		if (ktime_compare(ktime_get(), timeout) > 0) {
			WARN(1, "Failed to remove device because reset function did not finish\n");
			return;
		}
	}

	/* Mark device as disabled */
	hdev->disabled = true;

	/* Flush anyone that is inside the critical section of enqueue
	 * jobs to the H/W
	 */
	hdev->asic_funcs->hw_queues_lock(hdev);
	hdev->asic_funcs->hw_queues_unlock(hdev);

	/* Flush anyone that is inside device open */
	mutex_lock(&hdev->fpriv_list_lock);
	mutex_unlock(&hdev->fpriv_list_lock);

	hdev->hard_reset_pending = true;

	hl_hwmon_fini(hdev);

	device_late_fini(hdev);

	hl_debugfs_remove_device(hdev);

	/*
	 * Halt the engines and disable interrupts so we won't get any more
	 * completions from H/W and we won't have any accesses from the
	 * H/W to the host machine
	 */
	hdev->asic_funcs->halt_engines(hdev, true);

	/* Go over all the queues, release all CS and their jobs */
	hl_cs_rollback_all(hdev);

	/* Kill processes here after CS rollback. This is because the process
	 * can't really exit until all its CSs are done, which is what we
	 * do in cs rollback
	 */
	device_kill_open_processes(hdev);

	hl_cb_pool_fini(hdev);

	/* Release kernel context */
	if ((hdev->kernel_ctx) && (hl_ctx_put(hdev->kernel_ctx) != 1))
		dev_err(hdev->dev, "kernel ctx is still alive\n");

	/* Reset the H/W. It will be in idle state after this returns */
	hdev->asic_funcs->hw_fini(hdev, true);

	hl_vm_fini(hdev);

	hl_mmu_fini(hdev);

	hl_eq_fini(hdev, &hdev->event_queue);

	for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++)
		hl_cq_fini(hdev, &hdev->completion_queue[i]);
	kfree(hdev->completion_queue);

	hl_hw_queues_destroy(hdev);

	/* Call ASIC S/W finalize function */
	hdev->asic_funcs->sw_fini(hdev);

	device_early_fini(hdev);

	/* Hide devices and sysfs nodes from user */
	device_cdev_sysfs_del(hdev);

	pr_info("removed device successfully\n");
}

/*
 * MMIO register access helper functions.
 */

/*
 * hl_rreg - Read an MMIO register
 *
 * @hdev: pointer to habanalabs device structure
 * @reg: MMIO register offset (in bytes)
 *
 * Returns the value of the MMIO register we are asked to read
 *
 */
inline u32 hl_rreg(struct hl_device *hdev, u32 reg)
{
	return readl(hdev->rmmio + reg);
}

/*
 * hl_wreg - Write to an MMIO register
 *
 * @hdev: pointer to habanalabs device structure
 * @reg: MMIO register offset (in bytes)
 * @val: 32-bit value
 *
 * Writes the 32-bit value into the MMIO register
 *
 */
inline void hl_wreg(struct hl_device *hdev, u32 reg, u32 val)
{
	writel(val, hdev->rmmio + reg);
}