summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
blob: d321222fd92ef0a1cbc0fda0110da1f8230d9d39 (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
/*
 * Copyright 2014 Advanced Micro Devices, Inc.
 *
 * 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 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
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 <linux/device.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/compat.h>
#include <uapi/linux/kfd_ioctl.h>
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <asm/processor.h>
#include "kfd_priv.h"
#include "kfd_device_queue_manager.h"
#include "kfd_dbgmgr.h"

static long kfd_ioctl(struct file *, unsigned int, unsigned long);
static int kfd_open(struct inode *, struct file *);
static int kfd_mmap(struct file *, struct vm_area_struct *);

static const char kfd_dev_name[] = "kfd";

static const struct file_operations kfd_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = kfd_ioctl,
	.compat_ioctl = kfd_ioctl,
	.open = kfd_open,
	.mmap = kfd_mmap,
};

static int kfd_char_dev_major = -1;
static struct class *kfd_class;
struct device *kfd_device;

int kfd_chardev_init(void)
{
	int err = 0;

	kfd_char_dev_major = register_chrdev(0, kfd_dev_name, &kfd_fops);
	err = kfd_char_dev_major;
	if (err < 0)
		goto err_register_chrdev;

	kfd_class = class_create(THIS_MODULE, kfd_dev_name);
	err = PTR_ERR(kfd_class);
	if (IS_ERR(kfd_class))
		goto err_class_create;

	kfd_device = device_create(kfd_class, NULL,
					MKDEV(kfd_char_dev_major, 0),
					NULL, kfd_dev_name);
	err = PTR_ERR(kfd_device);
	if (IS_ERR(kfd_device))
		goto err_device_create;

	return 0;

err_device_create:
	class_destroy(kfd_class);
err_class_create:
	unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
err_register_chrdev:
	return err;
}

void kfd_chardev_exit(void)
{
	device_destroy(kfd_class, MKDEV(kfd_char_dev_major, 0));
	class_destroy(kfd_class);
	unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
}

struct device *kfd_chardev(void)
{
	return kfd_device;
}


static int kfd_open(struct inode *inode, struct file *filep)
{
	struct kfd_process *process;
	bool is_32bit_user_mode;

	if (iminor(inode) != 0)
		return -ENODEV;

	is_32bit_user_mode = is_compat_task();

	if (is_32bit_user_mode == true) {
		dev_warn(kfd_device,
			"Process %d (32-bit) failed to open /dev/kfd\n"
			"32-bit processes are not supported by amdkfd\n",
			current->pid);
		return -EPERM;
	}

	process = kfd_create_process(current);
	if (IS_ERR(process))
		return PTR_ERR(process);

	dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n",
		process->pasid, process->is_32bit_user_mode);

	return 0;
}

static int kfd_ioctl_get_version(struct file *filep, struct kfd_process *p,
					void *data)
{
	struct kfd_ioctl_get_version_args *args = data;
	int err = 0;

	args->major_version = KFD_IOCTL_MAJOR_VERSION;
	args->minor_version = KFD_IOCTL_MINOR_VERSION;

	return err;
}

static int set_queue_properties_from_user(struct queue_properties *q_properties,
				struct kfd_ioctl_create_queue_args *args)
{
	if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
		pr_err("kfd: queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
		return -EINVAL;
	}

	if (args->queue_priority > KFD_MAX_QUEUE_PRIORITY) {
		pr_err("kfd: queue priority must be between 0 to KFD_MAX_QUEUE_PRIORITY\n");
		return -EINVAL;
	}

	if ((args->ring_base_address) &&
		(!access_ok(VERIFY_WRITE,
			(const void __user *) args->ring_base_address,
			sizeof(uint64_t)))) {
		pr_err("kfd: can't access ring base address\n");
		return -EFAULT;
	}

	if (!is_power_of_2(args->ring_size) && (args->ring_size != 0)) {
		pr_err("kfd: ring size must be a power of 2 or 0\n");
		return -EINVAL;
	}

	if (!access_ok(VERIFY_WRITE,
			(const void __user *) args->read_pointer_address,
			sizeof(uint32_t))) {
		pr_err("kfd: can't access read pointer\n");
		return -EFAULT;
	}

	if (!access_ok(VERIFY_WRITE,
			(const void __user *) args->write_pointer_address,
			sizeof(uint32_t))) {
		pr_err("kfd: can't access write pointer\n");
		return -EFAULT;
	}

	if (args->eop_buffer_address &&
		!access_ok(VERIFY_WRITE,
			(const void __user *) args->eop_buffer_address,
			sizeof(uint32_t))) {
		pr_debug("kfd: can't access eop buffer");
		return -EFAULT;
	}

	if (args->ctx_save_restore_address &&
		!access_ok(VERIFY_WRITE,
			(const void __user *) args->ctx_save_restore_address,
			sizeof(uint32_t))) {
		pr_debug("kfd: can't access ctx save restore buffer");
		return -EFAULT;
	}

	q_properties->is_interop = false;
	q_properties->queue_percent = args->queue_percentage;
	q_properties->priority = args->queue_priority;
	q_properties->queue_address = args->ring_base_address;
	q_properties->queue_size = args->ring_size;
	q_properties->read_ptr = (uint32_t *) args->read_pointer_address;
	q_properties->write_ptr = (uint32_t *) args->write_pointer_address;
	q_properties->eop_ring_buffer_address = args->eop_buffer_address;
	q_properties->eop_ring_buffer_size = args->eop_buffer_size;
	q_properties->ctx_save_restore_area_address =
			args->ctx_save_restore_address;
	q_properties->ctx_save_restore_area_size = args->ctx_save_restore_size;
	if (args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE ||
		args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE_AQL)
		q_properties->type = KFD_QUEUE_TYPE_COMPUTE;
	else if (args->queue_type == KFD_IOC_QUEUE_TYPE_SDMA)
		q_properties->type = KFD_QUEUE_TYPE_SDMA;
	else
		return -ENOTSUPP;

	if (args->queue_type == KFD_IOC_QUEUE_TYPE_COMPUTE_AQL)
		q_properties->format = KFD_QUEUE_FORMAT_AQL;
	else
		q_properties->format = KFD_QUEUE_FORMAT_PM4;

	pr_debug("Queue Percentage (%d, %d)\n",
			q_properties->queue_percent, args->queue_percentage);

	pr_debug("Queue Priority (%d, %d)\n",
			q_properties->priority, args->queue_priority);

	pr_debug("Queue Address (0x%llX, 0x%llX)\n",
			q_properties->queue_address, args->ring_base_address);

	pr_debug("Queue Size (0x%llX, %u)\n",
			q_properties->queue_size, args->ring_size);

	pr_debug("Queue r/w Pointers (0x%llX, 0x%llX)\n",
			(uint64_t) q_properties->read_ptr,
			(uint64_t) q_properties->write_ptr);

	pr_debug("Queue Format (%d)\n", q_properties->format);

	pr_debug("Queue EOP (0x%llX)\n", q_properties->eop_ring_buffer_address);

	pr_debug("Queue CTX save arex (0x%llX)\n",
			q_properties->ctx_save_restore_area_address);

	return 0;
}

static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
					void *data)
{
	struct kfd_ioctl_create_queue_args *args = data;
	struct kfd_dev *dev;
	int err = 0;
	unsigned int queue_id;
	struct kfd_process_device *pdd;
	struct queue_properties q_properties;

	memset(&q_properties, 0, sizeof(struct queue_properties));

	pr_debug("kfd: creating queue ioctl\n");

	err = set_queue_properties_from_user(&q_properties, args);
	if (err)
		return err;

	pr_debug("kfd: looking for gpu id 0x%x\n", args->gpu_id);
	dev = kfd_device_by_id(args->gpu_id);
	if (dev == NULL) {
		pr_debug("kfd: gpu id 0x%x was not found\n", args->gpu_id);
		return -EINVAL;
	}

	mutex_lock(&p->mutex);

	pdd = kfd_bind_process_to_device(dev, p);
	if (IS_ERR(pdd)) {
		err = -ESRCH;
		goto err_bind_process;
	}

	pr_debug("kfd: creating queue for PASID %d on GPU 0x%x\n",
			p->pasid,
			dev->id);

	err = pqm_create_queue(&p->pqm, dev, filep, &q_properties,
				0, q_properties.type, &queue_id);
	if (err != 0)
		goto err_create_queue;

	args->queue_id = queue_id;


	/* Return gpu_id as doorbell offset for mmap usage */
	args->doorbell_offset = (KFD_MMAP_DOORBELL_MASK | args->gpu_id);
	args->doorbell_offset <<= PAGE_SHIFT;

	mutex_unlock(&p->mutex);

	pr_debug("kfd: queue id %d was created successfully\n", args->queue_id);

	pr_debug("ring buffer address == 0x%016llX\n",
			args->ring_base_address);

	pr_debug("read ptr address    == 0x%016llX\n",
			args->read_pointer_address);

	pr_debug("write ptr address   == 0x%016llX\n",
			args->write_pointer_address);

	return 0;

err_create_queue:
err_bind_process:
	mutex_unlock(&p->mutex);
	return err;
}

static int kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p,
					void *data)
{
	int retval;
	struct kfd_ioctl_destroy_queue_args *args = data;

	pr_debug("kfd: destroying queue id %d for PASID %d\n",
				args->queue_id,
				p->pasid);

	mutex_lock(&p->mutex);

	retval = pqm_destroy_queue(&p->pqm, args->queue_id);

	mutex_unlock(&p->mutex);
	return retval;
}

static int kfd_ioctl_update_queue(struct file *filp, struct kfd_process *p,
					void *data)
{
	int retval;
	struct kfd_ioctl_update_queue_args *args = data;
	struct queue_properties properties;

	if (args->queue_percentage > KFD_MAX_QUEUE_PERCENTAGE) {
		pr_err("kfd: queue percentage must be between 0 to KFD_MAX_QUEUE_PERCENTAGE\n");
		return -EINVAL;
	}

	if (args->queue_priority > KFD_MAX_QUEUE_PRIORITY) {
		pr_err("kfd: queue priority must be between 0 to KFD_MAX_QUEUE_PRIORITY\n");
		return -EINVAL;
	}

	if ((args->ring_base_address) &&
		(!access_ok(VERIFY_WRITE,
			(const void __user *) args->ring_base_address,
			sizeof(uint64_t)))) {
		pr_err("kfd: can't access ring base address\n");
		return -EFAULT;
	}

	if (!is_power_of_2(args->ring_size) && (args->ring_size != 0)) {
		pr_err("kfd: ring size must be a power of 2 or 0\n");
		return -EINVAL;
	}

	properties.queue_address = args->ring_base_address;
	properties.queue_size = args->ring_size;
	properties.queue_percent = args->queue_percentage;
	properties.priority = args->queue_priority;

	pr_debug("kfd: updating queue id %d for PASID %d\n",
			args->queue_id, p->pasid);

	mutex_lock(&p->mutex);

	retval = pqm_update_queue(&p->pqm, args->queue_id, &properties);

	mutex_unlock(&p->mutex);

	return retval;
}

static int kfd_ioctl_set_memory_policy(struct file *filep,
					struct kfd_process *p, void *data)
{
	struct kfd_ioctl_set_memory_policy_args *args = data;
	struct kfd_dev *dev;
	int err = 0;
	struct kfd_process_device *pdd;
	enum cache_policy default_policy, alternate_policy;

	if (args->default_policy != KFD_IOC_CACHE_POLICY_COHERENT
	    && args->default_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
		return -EINVAL;
	}

	if (args->alternate_policy != KFD_IOC_CACHE_POLICY_COHERENT
	    && args->alternate_policy != KFD_IOC_CACHE_POLICY_NONCOHERENT) {
		return -EINVAL;
	}

	dev = kfd_device_by_id(args->gpu_id);
	if (dev == NULL)
		return -EINVAL;

	mutex_lock(&p->mutex);

	pdd = kfd_bind_process_to_device(dev, p);
	if (IS_ERR(pdd)) {
		err = -ESRCH;
		goto out;
	}

	default_policy = (args->default_policy == KFD_IOC_CACHE_POLICY_COHERENT)
			 ? cache_policy_coherent : cache_policy_noncoherent;

	alternate_policy =
		(args->alternate_policy == KFD_IOC_CACHE_POLICY_COHERENT)
		   ? cache_policy_coherent : cache_policy_noncoherent;

	if (!dev->dqm->ops.set_cache_memory_policy(dev->dqm,
				&pdd->qpd,
				default_policy,
				alternate_policy,
				(void __user *)args->alternate_aperture_base,
				args->alternate_aperture_size))
		err = -EINVAL;

out:
	mutex_unlock(&p->mutex);

	return err;
}

static int kfd_ioctl_dbg_register(struct file *filep,
				struct kfd_process *p, void *data)
{
	struct kfd_ioctl_dbg_register_args *args = data;
	struct kfd_dev *dev;
	struct kfd_dbgmgr *dbgmgr_ptr;
	struct kfd_process_device *pdd;
	bool create_ok;
	long status = 0;

	dev = kfd_device_by_id(args->gpu_id);
	if (dev == NULL)
		return -EINVAL;

	if (dev->device_info->asic_family == CHIP_CARRIZO) {
		pr_debug("kfd_ioctl_dbg_register not supported on CZ\n");
		return -EINVAL;
	}

	mutex_lock(kfd_get_dbgmgr_mutex());
	mutex_lock(&p->mutex);

	/*
	 * make sure that we have pdd, if this the first queue created for
	 * this process
	 */
	pdd = kfd_bind_process_to_device(dev, p);
	if (IS_ERR(pdd)) {
		mutex_unlock(&p->mutex);
		mutex_unlock(kfd_get_dbgmgr_mutex());
		return PTR_ERR(pdd);
	}

	if (dev->dbgmgr == NULL) {
		/* In case of a legal call, we have no dbgmgr yet */
		create_ok = kfd_dbgmgr_create(&dbgmgr_ptr, dev);
		if (create_ok) {
			status = kfd_dbgmgr_register(dbgmgr_ptr, p);
			if (status != 0)
				kfd_dbgmgr_destroy(dbgmgr_ptr);
			else
				dev->dbgmgr = dbgmgr_ptr;
		}
	} else {
		pr_debug("debugger already registered\n");
		status = -EINVAL;
	}

	mutex_unlock(&p->mutex);
	mutex_unlock(kfd_get_dbgmgr_mutex());

	return status;
}

static int kfd_ioctl_dbg_unrgesiter(struct file *filep,
				struct kfd_process *p, void *data)
{
	struct kfd_ioctl_dbg_unregister_args *args = data;
	struct kfd_dev *dev;
	long status;

	dev = kfd_device_by_id(args->gpu_id);
	if (dev == NULL)
		return -EINVAL;

	if (dev->device_info->asic_family == CHIP_CARRIZO) {
		pr_debug("kfd_ioctl_dbg_unrgesiter not supported on CZ\n");
		return -EINVAL;
	}

	mutex_lock(kfd_get_dbgmgr_mutex());

	status = kfd_dbgmgr_unregister(dev->dbgmgr, p);
	if (status == 0) {
		kfd_dbgmgr_destroy(dev->dbgmgr);
		dev->dbgmgr = NULL;
	}

	mutex_unlock(kfd_get_dbgmgr_mutex());

	return status;
}

/*
 * Parse and generate variable size data structure for address watch.
 * Total size of the buffer and # watch points is limited in order
 * to prevent kernel abuse. (no bearing to the much smaller HW limitation
 * which is enforced by dbgdev module)
 * please also note that the watch address itself are not "copied from user",
 * since it be set into the HW in user mode values.
 *
 */
static int kfd_ioctl_dbg_address_watch(struct file *filep,
					struct kfd_process *p, void *data)
{
	struct kfd_ioctl_dbg_address_watch_args *args = data;
	struct kfd_dev *dev;
	struct dbg_address_watch_info aw_info;
	unsigned char *args_buff;
	long status;
	void __user *cmd_from_user;
	uint64_t watch_mask_value = 0;
	unsigned int args_idx = 0;

	memset((void *) &aw_info, 0, sizeof(struct dbg_address_watch_info));

	dev = kfd_device_by_id(args->gpu_id);
	if (dev == NULL)
		return -EINVAL;

	if (dev->device_info->asic_family == CHIP_CARRIZO) {
		pr_debug("kfd_ioctl_dbg_wave_control not supported on CZ\n");
		return -EINVAL;
	}

	cmd_from_user = (void __user *) args->content_ptr;

	/* Validate arguments */

	if ((args->buf_size_in_bytes > MAX_ALLOWED_AW_BUFF_SIZE) ||
		(args->buf_size_in_bytes <= sizeof(*args) + sizeof(int) * 2) ||
		(cmd_from_user == NULL))
		return -EINVAL;

	/* this is the actual buffer to work with */

	args_buff = memdup_user(args_buff,
				args->buf_size_in_bytes - sizeof(*args));
	if (IS_ERR(args_buff))
		return PTR_ERR(args_buff);

	aw_info.process = p;

	aw_info.num_watch_points = *((uint32_t *)(&args_buff[args_idx]));
	args_idx += sizeof(aw_info.num_watch_points);

	aw_info.watch_mode = (enum HSA_DBG_WATCH_MODE *) &args_buff[args_idx];
	args_idx += sizeof(enum HSA_DBG_WATCH_MODE) * aw_info.num_watch_points;

	/*
	 * set watch address base pointer to point on the array base
	 * within args_buff
	 */
	aw_info.watch_address = (uint64_t *) &args_buff[args_idx];

	/* skip over the addresses buffer */
	args_idx += sizeof(aw_info.watch_address) * aw_info.num_watch_points;

	if (args_idx >= args->buf_size_in_bytes - sizeof(*args)) {
		kfree(args_buff);
		return -EINVAL;
	}

	watch_mask_value = (uint64_t) args_buff[args_idx];

	if (watch_mask_value > 0) {
		/*
		 * There is an array of masks.
		 * set watch mask base pointer to point on the array base
		 * within args_buff
		 */
		aw_info.watch_mask = (uint64_t *) &args_buff[args_idx];

		/* skip over the masks buffer */
		args_idx += sizeof(aw_info.watch_mask) *
				aw_info.num_watch_points;
	} else {
		/* just the NULL mask, set to NULL and skip over it */
		aw_info.watch_mask = NULL;
		args_idx += sizeof(aw_info.watch_mask);
	}

	if (args_idx >= args->buf_size_in_bytes - sizeof(args)) {
		kfree(args_buff);
		return -EINVAL;
	}

	/* Currently HSA Event is not supported for DBG */
	aw_info.watch_event = NULL;

	mutex_lock(kfd_get_dbgmgr_mutex());

	status = kfd_dbgmgr_address_watch(dev->dbgmgr, &aw_info);

	mutex_unlock(kfd_get_dbgmgr_mutex());

	kfree(args_buff);

	return status;
}

/* Parse and generate fixed size data structure for wave control */
static int kfd_ioctl_dbg_wave_control(struct file *filep,
					struct kfd_process *p, void *data)
{
	struct kfd_ioctl_dbg_wave_control_args *args = data;
	struct kfd_dev *dev;
	struct dbg_wave_control_info wac_info;
	unsigned char *args_buff;
	uint32_t computed_buff_size;
	long status;
	void __user *cmd_from_user;
	unsigned int args_idx = 0;

	memset((void *) &wac_info, 0, sizeof(struct dbg_wave_control_info));

	/* we use compact form, independent of the packing attribute value */
	computed_buff_size = sizeof(*args) +
				sizeof(wac_info.mode) +
				sizeof(wac_info.operand) +
				sizeof(wac_info.dbgWave_msg.DbgWaveMsg) +
				sizeof(wac_info.dbgWave_msg.MemoryVA) +
				sizeof(wac_info.trapId);

	dev = kfd_device_by_id(args->gpu_id);
	if (dev == NULL)
		return -EINVAL;

	if (dev->device_info->asic_family == CHIP_CARRIZO) {
		pr_debug("kfd_ioctl_dbg_wave_control not supported on CZ\n");
		return -EINVAL;
	}

	/* input size must match the computed "compact" size */
	if (args->buf_size_in_bytes != computed_buff_size) {
		pr_debug("size mismatch, computed : actual %u : %u\n",
				args->buf_size_in_bytes, computed_buff_size);
		return -EINVAL;
	}

	cmd_from_user = (void __user *) args->content_ptr;

	if (cmd_from_user == NULL)
		return -EINVAL;

	/* copy the entire buffer from user */

	args_buff = memdup_user(cmd_from_user,
				args->buf_size_in_bytes - sizeof(*args));
	if (IS_ERR(args_buff))
		return PTR_ERR(args_buff);

	/* move ptr to the start of the "pay-load" area */
	wac_info.process = p;

	wac_info.operand = *((enum HSA_DBG_WAVEOP *)(&args_buff[args_idx]));
	args_idx += sizeof(wac_info.operand);

	wac_info.mode = *((enum HSA_DBG_WAVEMODE *)(&args_buff[args_idx]));
	args_idx += sizeof(wac_info.mode);

	wac_info.trapId = *((uint32_t *)(&args_buff[args_idx]));
	args_idx += sizeof(wac_info.trapId);

	wac_info.dbgWave_msg.DbgWaveMsg.WaveMsgInfoGen2.Value =
					*((uint32_t *)(&args_buff[args_idx]));
	wac_info.dbgWave_msg.MemoryVA = NULL;

	mutex_lock(kfd_get_dbgmgr_mutex());

	pr_debug("Calling dbg manager process %p, operand %u, mode %u, trapId %u, message %u\n",
			wac_info.process, wac_info.operand,
			wac_info.mode, wac_info.trapId,
			wac_info.dbgWave_msg.DbgWaveMsg.WaveMsgInfoGen2.Value);

	status = kfd_dbgmgr_wave_control(dev->dbgmgr, &wac_info);

	pr_debug("Returned status of dbg manager is %ld\n", status);

	mutex_unlock(kfd_get_dbgmgr_mutex());

	kfree(args_buff);

	return status;
}

static int kfd_ioctl_get_clock_counters(struct file *filep,
				struct kfd_process *p, void *data)
{
	struct kfd_ioctl_get_clock_counters_args *args = data;
	struct kfd_dev *dev;
	struct timespec64 time;

	dev = kfd_device_by_id(args->gpu_id);
	if (dev == NULL)
		return -EINVAL;

	/* Reading GPU clock counter from KGD */
	args->gpu_clock_counter =
		dev->kfd2kgd->get_gpu_clock_counter(dev->kgd);

	/* No access to rdtsc. Using raw monotonic time */
	getrawmonotonic64(&time);
	args->cpu_clock_counter = (uint64_t)timespec64_to_ns(&time);

	get_monotonic_boottime64(&time);
	args->system_clock_counter = (uint64_t)timespec64_to_ns(&time);

	/* Since the counter is in nano-seconds we use 1GHz frequency */
	args->system_clock_freq = 1000000000;

	return 0;
}


static int kfd_ioctl_get_process_apertures(struct file *filp,
				struct kfd_process *p, void *data)
{
	struct kfd_ioctl_get_process_apertures_args *args = data;
	struct kfd_process_device_apertures *pAperture;
	struct kfd_process_device *pdd;

	dev_dbg(kfd_device, "get apertures for PASID %d", p->pasid);

	args->num_of_nodes = 0;

	mutex_lock(&p->mutex);

	/*if the process-device list isn't empty*/
	if (kfd_has_process_device_data(p)) {
		/* Run over all pdd of the process */
		pdd = kfd_get_first_process_device_data(p);
		do {
			pAperture =
				&args->process_apertures[args->num_of_nodes];
			pAperture->gpu_id = pdd->dev->id;
			pAperture->lds_base = pdd->lds_base;
			pAperture->lds_limit = pdd->lds_limit;
			pAperture->gpuvm_base = pdd->gpuvm_base;
			pAperture->gpuvm_limit = pdd->gpuvm_limit;
			pAperture->scratch_base = pdd->scratch_base;
			pAperture->scratch_limit = pdd->scratch_limit;

			dev_dbg(kfd_device,
				"node id %u\n", args->num_of_nodes);
			dev_dbg(kfd_device,
				"gpu id %u\n", pdd->dev->id);
			dev_dbg(kfd_device,
				"lds_base %llX\n", pdd->lds_base);
			dev_dbg(kfd_device,
				"lds_limit %llX\n", pdd->lds_limit);
			dev_dbg(kfd_device,
				"gpuvm_base %llX\n", pdd->gpuvm_base);
			dev_dbg(kfd_device,
				"gpuvm_limit %llX\n", pdd->gpuvm_limit);
			dev_dbg(kfd_device,
				"scratch_base %llX\n", pdd->scratch_base);
			dev_dbg(kfd_device,
				"scratch_limit %llX\n", pdd->scratch_limit);

			args->num_of_nodes++;
		} while ((pdd = kfd_get_next_process_device_data(p, pdd)) != NULL &&
				(args->num_of_nodes < NUM_OF_SUPPORTED_GPUS));
	}

	mutex_unlock(&p->mutex);

	return 0;
}

static int kfd_ioctl_create_event(struct file *filp, struct kfd_process *p,
					void *data)
{
	struct kfd_ioctl_create_event_args *args = data;
	int err;

	err = kfd_event_create(filp, p, args->event_type,
				args->auto_reset != 0, args->node_id,
				&args->event_id, &args->event_trigger_data,
				&args->event_page_offset,
				&args->event_slot_index);

	return err;
}

static int kfd_ioctl_destroy_event(struct file *filp, struct kfd_process *p,
					void *data)
{
	struct kfd_ioctl_destroy_event_args *args = data;

	return kfd_event_destroy(p, args->event_id);
}

static int kfd_ioctl_set_event(struct file *filp, struct kfd_process *p,
				void *data)
{
	struct kfd_ioctl_set_event_args *args = data;

	return kfd_set_event(p, args->event_id);
}

static int kfd_ioctl_reset_event(struct file *filp, struct kfd_process *p,
				void *data)
{
	struct kfd_ioctl_reset_event_args *args = data;

	return kfd_reset_event(p, args->event_id);
}

static int kfd_ioctl_wait_events(struct file *filp, struct kfd_process *p,
				void *data)
{
	struct kfd_ioctl_wait_events_args *args = data;
	enum kfd_event_wait_result wait_result;
	int err;

	err = kfd_wait_on_events(p, args->num_events,
			(void __user *)args->events_ptr,
			(args->wait_for_all != 0),
			args->timeout, &wait_result);

	args->wait_result = wait_result;

	return err;
}

#define AMDKFD_IOCTL_DEF(ioctl, _func, _flags) \
	[_IOC_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}

/** Ioctl table */
static const struct amdkfd_ioctl_desc amdkfd_ioctls[] = {
	AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_VERSION,
			kfd_ioctl_get_version, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_CREATE_QUEUE,
			kfd_ioctl_create_queue, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_DESTROY_QUEUE,
			kfd_ioctl_destroy_queue, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_SET_MEMORY_POLICY,
			kfd_ioctl_set_memory_policy, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_CLOCK_COUNTERS,
			kfd_ioctl_get_clock_counters, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_GET_PROCESS_APERTURES,
			kfd_ioctl_get_process_apertures, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_UPDATE_QUEUE,
			kfd_ioctl_update_queue, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_CREATE_EVENT,
			kfd_ioctl_create_event, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_DESTROY_EVENT,
			kfd_ioctl_destroy_event, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_SET_EVENT,
			kfd_ioctl_set_event, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_RESET_EVENT,
			kfd_ioctl_reset_event, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_WAIT_EVENTS,
			kfd_ioctl_wait_events, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_DBG_REGISTER,
			kfd_ioctl_dbg_register, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_DBG_UNREGISTER,
			kfd_ioctl_dbg_unrgesiter, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_DBG_ADDRESS_WATCH,
			kfd_ioctl_dbg_address_watch, 0),

	AMDKFD_IOCTL_DEF(AMDKFD_IOC_DBG_WAVE_CONTROL,
			kfd_ioctl_dbg_wave_control, 0),
};

#define AMDKFD_CORE_IOCTL_COUNT	ARRAY_SIZE(amdkfd_ioctls)

static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
	struct kfd_process *process;
	amdkfd_ioctl_t *func;
	const struct amdkfd_ioctl_desc *ioctl = NULL;
	unsigned int nr = _IOC_NR(cmd);
	char stack_kdata[128];
	char *kdata = NULL;
	unsigned int usize, asize;
	int retcode = -EINVAL;

	if (nr >= AMDKFD_CORE_IOCTL_COUNT)
		goto err_i1;

	if ((nr >= AMDKFD_COMMAND_START) && (nr < AMDKFD_COMMAND_END)) {
		u32 amdkfd_size;

		ioctl = &amdkfd_ioctls[nr];

		amdkfd_size = _IOC_SIZE(ioctl->cmd);
		usize = asize = _IOC_SIZE(cmd);
		if (amdkfd_size > asize)
			asize = amdkfd_size;

		cmd = ioctl->cmd;
	} else
		goto err_i1;

	dev_dbg(kfd_device, "ioctl cmd 0x%x (#%d), arg 0x%lx\n", cmd, nr, arg);

	process = kfd_get_process(current);
	if (IS_ERR(process)) {
		dev_dbg(kfd_device, "no process\n");
		goto err_i1;
	}

	/* Do not trust userspace, use our own definition */
	func = ioctl->func;

	if (unlikely(!func)) {
		dev_dbg(kfd_device, "no function\n");
		retcode = -EINVAL;
		goto err_i1;
	}

	if (cmd & (IOC_IN | IOC_OUT)) {
		if (asize <= sizeof(stack_kdata)) {
			kdata = stack_kdata;
		} else {
			kdata = kmalloc(asize, GFP_KERNEL);
			if (!kdata) {
				retcode = -ENOMEM;
				goto err_i1;
			}
		}
		if (asize > usize)
			memset(kdata + usize, 0, asize - usize);
	}

	if (cmd & IOC_IN) {
		if (copy_from_user(kdata, (void __user *)arg, usize) != 0) {
			retcode = -EFAULT;
			goto err_i1;
		}
	} else if (cmd & IOC_OUT) {
		memset(kdata, 0, usize);
	}

	retcode = func(filep, process, kdata);

	if (cmd & IOC_OUT)
		if (copy_to_user((void __user *)arg, kdata, usize) != 0)
			retcode = -EFAULT;

err_i1:
	if (!ioctl)
		dev_dbg(kfd_device, "invalid ioctl: pid=%d, cmd=0x%02x, nr=0x%02x\n",
			  task_pid_nr(current), cmd, nr);

	if (kdata != stack_kdata)
		kfree(kdata);

	if (retcode)
		dev_dbg(kfd_device, "ret = %d\n", retcode);

	return retcode;
}

static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct kfd_process *process;

	process = kfd_get_process(current);
	if (IS_ERR(process))
		return PTR_ERR(process);

	if ((vma->vm_pgoff & KFD_MMAP_DOORBELL_MASK) ==
			KFD_MMAP_DOORBELL_MASK) {
		vma->vm_pgoff = vma->vm_pgoff ^ KFD_MMAP_DOORBELL_MASK;
		return kfd_doorbell_mmap(process, vma);
	} else if ((vma->vm_pgoff & KFD_MMAP_EVENTS_MASK) ==
			KFD_MMAP_EVENTS_MASK) {
		vma->vm_pgoff = vma->vm_pgoff ^ KFD_MMAP_EVENTS_MASK;
		return kfd_event_mmap(process, vma);
	}

	return -EFAULT;
}
OpenPOWER on IntegriCloud