summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/dt_cpu_ftrs.c
blob: 3a409517c031dc9506e649b9f9b7c3eca7322434 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2017, Nicholas Piggin, IBM Corporation
 */

#define pr_fmt(fmt) "dt-cpu-ftrs: " fmt

#include <linux/export.h>
#include <linux/init.h>
#include <linux/jump_label.h>
#include <linux/libfdt.h>
#include <linux/memblock.h>
#include <linux/printk.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/threads.h>

#include <asm/cputable.h>
#include <asm/dt_cpu_ftrs.h>
#include <asm/mmu.h>
#include <asm/oprofile_impl.h>
#include <asm/prom.h>
#include <asm/setup.h>


/* Device-tree visible constants follow */
#define ISA_V2_07B      2070
#define ISA_V3_0B       3000
#define ISA_V3_1        3100

#define USABLE_PR               (1U << 0)
#define USABLE_OS               (1U << 1)
#define USABLE_HV               (1U << 2)

#define HV_SUPPORT_HFSCR        (1U << 0)
#define OS_SUPPORT_FSCR         (1U << 0)

/* For parsing, we define all bits set as "NONE" case */
#define HV_SUPPORT_NONE		0xffffffffU
#define OS_SUPPORT_NONE		0xffffffffU

struct dt_cpu_feature {
	const char *name;
	uint32_t isa;
	uint32_t usable_privilege;
	uint32_t hv_support;
	uint32_t os_support;
	uint32_t hfscr_bit_nr;
	uint32_t fscr_bit_nr;
	uint32_t hwcap_bit_nr;
	/* fdt parsing */
	unsigned long node;
	int enabled;
	int disabled;
};

#define MMU_FTRS_HASH_BASE (MMU_FTRS_POWER8)

#define COMMON_USER_BASE	(PPC_FEATURE_32 | PPC_FEATURE_64 | \
				 PPC_FEATURE_ARCH_2_06 |\
				 PPC_FEATURE_ICACHE_SNOOP)
#define COMMON_USER2_BASE	(PPC_FEATURE2_ARCH_2_07 | \
				 PPC_FEATURE2_ISEL)
/*
 * Set up the base CPU
 */

extern long __machine_check_early_realmode_p8(struct pt_regs *regs);
extern long __machine_check_early_realmode_p9(struct pt_regs *regs);

static int hv_mode;

static struct {
	u64	lpcr;
	u64	lpcr_clear;
	u64	hfscr;
	u64	fscr;
	u64	pcr;
} system_registers;

static void (*init_pmu_registers)(void);

static void __restore_cpu_cpufeatures(void)
{
	u64 lpcr;

	/*
	 * LPCR is restored by the power on engine already. It can be changed
	 * after early init e.g., by radix enable, and we have no unified API
	 * for saving and restoring such SPRs.
	 *
	 * This ->restore hook should really be removed from idle and register
	 * restore moved directly into the idle restore code, because this code
	 * doesn't know how idle is implemented or what it needs restored here.
	 *
	 * The best we can do to accommodate secondary boot and idle restore
	 * for now is "or" LPCR with existing.
	 */
	lpcr = mfspr(SPRN_LPCR);
	lpcr |= system_registers.lpcr;
	lpcr &= ~system_registers.lpcr_clear;
	mtspr(SPRN_LPCR, lpcr);
	if (hv_mode) {
		mtspr(SPRN_LPID, 0);
		mtspr(SPRN_HFSCR, system_registers.hfscr);
		mtspr(SPRN_PCR, system_registers.pcr);
	}
	mtspr(SPRN_FSCR, system_registers.fscr);

	if (init_pmu_registers)
		init_pmu_registers();
}

static char dt_cpu_name[64];

static struct cpu_spec __initdata base_cpu_spec = {
	.cpu_name		= NULL,
	.cpu_features		= CPU_FTRS_DT_CPU_BASE,
	.cpu_user_features	= COMMON_USER_BASE,
	.cpu_user_features2	= COMMON_USER2_BASE,
	.mmu_features		= 0,
	.icache_bsize		= 32, /* minimum block size, fixed by */
	.dcache_bsize		= 32, /* cache info init.             */
	.num_pmcs		= 0,
	.pmc_type		= PPC_PMC_DEFAULT,
	.oprofile_cpu_type	= NULL,
	.oprofile_type		= PPC_OPROFILE_INVALID,
	.cpu_setup		= NULL,
	.cpu_restore		= __restore_cpu_cpufeatures,
	.machine_check_early	= NULL,
	.platform		= NULL,
};

static void __init cpufeatures_setup_cpu(void)
{
	set_cur_cpu_spec(&base_cpu_spec);

	cur_cpu_spec->pvr_mask = -1;
	cur_cpu_spec->pvr_value = mfspr(SPRN_PVR);

	/* Initialize the base environment -- clear FSCR/HFSCR.  */
	hv_mode = !!(mfmsr() & MSR_HV);
	if (hv_mode) {
		cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
		mtspr(SPRN_HFSCR, 0);
	}
	mtspr(SPRN_FSCR, 0);
	mtspr(SPRN_PCR, PCR_MASK);

	/*
	 * LPCR does not get cleared, to match behaviour with secondaries
	 * in __restore_cpu_cpufeatures. Once the idle code is fixed, this
	 * could clear LPCR too.
	 */
}

static int __init feat_try_enable_unknown(struct dt_cpu_feature *f)
{
	if (f->hv_support == HV_SUPPORT_NONE) {
	} else if (f->hv_support & HV_SUPPORT_HFSCR) {
		u64 hfscr = mfspr(SPRN_HFSCR);
		hfscr |= 1UL << f->hfscr_bit_nr;
		mtspr(SPRN_HFSCR, hfscr);
	} else {
		/* Does not have a known recipe */
		return 0;
	}

	if (f->os_support == OS_SUPPORT_NONE) {
	} else if (f->os_support & OS_SUPPORT_FSCR) {
		u64 fscr = mfspr(SPRN_FSCR);
		fscr |= 1UL << f->fscr_bit_nr;
		mtspr(SPRN_FSCR, fscr);
	} else {
		/* Does not have a known recipe */
		return 0;
	}

	if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
		uint32_t word = f->hwcap_bit_nr / 32;
		uint32_t bit = f->hwcap_bit_nr % 32;

		if (word == 0)
			cur_cpu_spec->cpu_user_features |= 1U << bit;
		else if (word == 1)
			cur_cpu_spec->cpu_user_features2 |= 1U << bit;
		else
			pr_err("%s could not advertise to user (no hwcap bits)\n", f->name);
	}

	return 1;
}

static int __init feat_enable(struct dt_cpu_feature *f)
{
	if (f->hv_support != HV_SUPPORT_NONE) {
		if (f->hfscr_bit_nr != -1) {
			u64 hfscr = mfspr(SPRN_HFSCR);
			hfscr |= 1UL << f->hfscr_bit_nr;
			mtspr(SPRN_HFSCR, hfscr);
		}
	}

	if (f->os_support != OS_SUPPORT_NONE) {
		if (f->fscr_bit_nr != -1) {
			u64 fscr = mfspr(SPRN_FSCR);
			fscr |= 1UL << f->fscr_bit_nr;
			mtspr(SPRN_FSCR, fscr);
		}
	}

	if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
		uint32_t word = f->hwcap_bit_nr / 32;
		uint32_t bit = f->hwcap_bit_nr % 32;

		if (word == 0)
			cur_cpu_spec->cpu_user_features |= 1U << bit;
		else if (word == 1)
			cur_cpu_spec->cpu_user_features2 |= 1U << bit;
		else
			pr_err("CPU feature: %s could not advertise to user (no hwcap bits)\n", f->name);
	}

	return 1;
}

static int __init feat_disable(struct dt_cpu_feature *f)
{
	return 0;
}

static int __init feat_enable_hv(struct dt_cpu_feature *f)
{
	u64 lpcr;

	if (!hv_mode) {
		pr_err("CPU feature hypervisor present in device tree but HV mode not enabled in the CPU. Ignoring.\n");
		return 0;
	}

	mtspr(SPRN_LPID, 0);

	lpcr = mfspr(SPRN_LPCR);
	lpcr &=  ~LPCR_LPES0; /* HV external interrupts */
	mtspr(SPRN_LPCR, lpcr);

	cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;

	return 1;
}

static int __init feat_enable_le(struct dt_cpu_feature *f)
{
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_TRUE_LE;
	return 1;
}

static int __init feat_enable_smt(struct dt_cpu_feature *f)
{
	cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_SMT;
	return 1;
}

static int __init feat_enable_idle_nap(struct dt_cpu_feature *f)
{
	u64 lpcr;

	/* Set PECE wakeup modes for ISA 207 */
	lpcr = mfspr(SPRN_LPCR);
	lpcr |=  LPCR_PECE0;
	lpcr |=  LPCR_PECE1;
	lpcr |=  LPCR_PECE2;
	mtspr(SPRN_LPCR, lpcr);

	return 1;
}

static int __init feat_enable_align_dsisr(struct dt_cpu_feature *f)
{
	cur_cpu_spec->cpu_features &= ~CPU_FTR_NODSISRALIGN;

	return 1;
}

static int __init feat_enable_idle_stop(struct dt_cpu_feature *f)
{
	u64 lpcr;

	/* Set PECE wakeup modes for ISAv3.0B */
	lpcr = mfspr(SPRN_LPCR);
	lpcr |=  LPCR_PECE0;
	lpcr |=  LPCR_PECE1;
	lpcr |=  LPCR_PECE2;
	mtspr(SPRN_LPCR, lpcr);

	return 1;
}

static int __init feat_enable_mmu_hash(struct dt_cpu_feature *f)
{
	u64 lpcr;

	lpcr = mfspr(SPRN_LPCR);
	lpcr &= ~LPCR_ISL;

	/* VRMASD */
	lpcr |= LPCR_VPM0;
	lpcr &= ~LPCR_VPM1;
	lpcr |= 0x10UL << LPCR_VRMASD_SH; /* L=1 LP=00 */
	mtspr(SPRN_LPCR, lpcr);

	cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;

	return 1;
}

static int __init feat_enable_mmu_hash_v3(struct dt_cpu_feature *f)
{
	u64 lpcr;

	system_registers.lpcr_clear |= (LPCR_ISL | LPCR_UPRT | LPCR_HR);
	lpcr = mfspr(SPRN_LPCR);
	lpcr &= ~(LPCR_ISL | LPCR_UPRT | LPCR_HR);
	mtspr(SPRN_LPCR, lpcr);

	cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;

	return 1;
}


static int __init feat_enable_mmu_radix(struct dt_cpu_feature *f)
{
#ifdef CONFIG_PPC_RADIX_MMU
	cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX;
	cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;

	return 1;
#endif
	return 0;
}

static int __init feat_enable_dscr(struct dt_cpu_feature *f)
{
	u64 lpcr;

	/*
	 * Linux relies on FSCR[DSCR] being clear, so that we can take the
	 * facility unavailable interrupt and track the task's usage of DSCR.
	 * See facility_unavailable_exception().
	 * Clear the bit here so that feat_enable() doesn't set it.
	 */
	f->fscr_bit_nr = -1;

	feat_enable(f);

	lpcr = mfspr(SPRN_LPCR);
	lpcr &= ~LPCR_DPFD;
	lpcr |=  (4UL << LPCR_DPFD_SH);
	mtspr(SPRN_LPCR, lpcr);

	return 1;
}

static void hfscr_pmu_enable(void)
{
	u64 hfscr = mfspr(SPRN_HFSCR);
	hfscr |= PPC_BIT(60);
	mtspr(SPRN_HFSCR, hfscr);
}

static void init_pmu_power8(void)
{
	if (hv_mode) {
		mtspr(SPRN_MMCRC, 0);
		mtspr(SPRN_MMCRH, 0);
	}

	mtspr(SPRN_MMCRA, 0);
	mtspr(SPRN_MMCR0, 0);
	mtspr(SPRN_MMCR1, 0);
	mtspr(SPRN_MMCR2, 0);
	mtspr(SPRN_MMCRS, 0);
}

static int __init feat_enable_mce_power8(struct dt_cpu_feature *f)
{
	cur_cpu_spec->platform = "power8";
	cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p8;

	return 1;
}

static int __init feat_enable_pmu_power8(struct dt_cpu_feature *f)
{
	hfscr_pmu_enable();

	init_pmu_power8();
	init_pmu_registers = init_pmu_power8;

	cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
	if (pvr_version_is(PVR_POWER8E))
		cur_cpu_spec->cpu_features |= CPU_FTR_PMAO_BUG;

	cur_cpu_spec->num_pmcs		= 6;
	cur_cpu_spec->pmc_type		= PPC_PMC_IBM;
	cur_cpu_spec->oprofile_cpu_type	= "ppc64/power8";

	return 1;
}

static void init_pmu_power9(void)
{
	if (hv_mode)
		mtspr(SPRN_MMCRC, 0);

	mtspr(SPRN_MMCRA, 0);
	mtspr(SPRN_MMCR0, 0);
	mtspr(SPRN_MMCR1, 0);
	mtspr(SPRN_MMCR2, 0);
}

static int __init feat_enable_mce_power9(struct dt_cpu_feature *f)
{
	cur_cpu_spec->platform = "power9";
	cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p9;

	return 1;
}

static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f)
{
	hfscr_pmu_enable();

	init_pmu_power9();
	init_pmu_registers = init_pmu_power9;

	cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;

	cur_cpu_spec->num_pmcs		= 6;
	cur_cpu_spec->pmc_type		= PPC_PMC_IBM;
	cur_cpu_spec->oprofile_cpu_type	= "ppc64/power9";

	return 1;
}

static int __init feat_enable_tm(struct dt_cpu_feature *f)
{
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	feat_enable(f);
	cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NOSC;
	return 1;
#endif
	return 0;
}

static int __init feat_enable_fp(struct dt_cpu_feature *f)
{
	feat_enable(f);
	cur_cpu_spec->cpu_features &= ~CPU_FTR_FPU_UNAVAILABLE;

	return 1;
}

static int __init feat_enable_vector(struct dt_cpu_feature *f)
{
#ifdef CONFIG_ALTIVEC
	feat_enable(f);
	cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
	cur_cpu_spec->cpu_features |= CPU_FTR_VMX_COPY;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;

	return 1;
#endif
	return 0;
}

static int __init feat_enable_vsx(struct dt_cpu_feature *f)
{
#ifdef CONFIG_VSX
	feat_enable(f);
	cur_cpu_spec->cpu_features |= CPU_FTR_VSX;
	cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_VSX;

	return 1;
#endif
	return 0;
}

static int __init feat_enable_purr(struct dt_cpu_feature *f)
{
	cur_cpu_spec->cpu_features |= CPU_FTR_PURR | CPU_FTR_SPURR;

	return 1;
}

static int __init feat_enable_ebb(struct dt_cpu_feature *f)
{
	/*
	 * PPC_FEATURE2_EBB is enabled in PMU init code because it has
	 * historically been related to the PMU facility. This may have
	 * to be decoupled if EBB becomes more generic. For now, follow
	 * existing convention.
	 */
	f->hwcap_bit_nr = -1;
	feat_enable(f);

	return 1;
}

static int __init feat_enable_dbell(struct dt_cpu_feature *f)
{
	u64 lpcr;

	/* P9 has an HFSCR for privileged state */
	feat_enable(f);

	cur_cpu_spec->cpu_features |= CPU_FTR_DBELL;

	lpcr = mfspr(SPRN_LPCR);
	lpcr |=  LPCR_PECEDH; /* hyp doorbell wakeup */
	mtspr(SPRN_LPCR, lpcr);

	return 1;
}

static int __init feat_enable_hvi(struct dt_cpu_feature *f)
{
	u64 lpcr;

	/*
	 * POWER9 XIVE interrupts including in OPAL XICS compatibility
	 * are always delivered as hypervisor virtualization interrupts (HVI)
	 * rather than EE.
	 *
	 * However LPES0 is not set here, in the chance that an EE does get
	 * delivered to the host somehow, the EE handler would not expect it
	 * to be delivered in LPES0 mode (e.g., using SRR[01]). This could
	 * happen if there is a bug in interrupt controller code, or IC is
	 * misconfigured in systemsim.
	 */

	lpcr = mfspr(SPRN_LPCR);
	lpcr |= LPCR_HVICE;	/* enable hvi interrupts */
	lpcr |= LPCR_HEIC;	/* disable ee interrupts when MSR_HV */
	lpcr |= LPCR_PECE_HVEE; /* hvi can wake from stop */
	mtspr(SPRN_LPCR, lpcr);

	return 1;
}

static int __init feat_enable_large_ci(struct dt_cpu_feature *f)
{
	cur_cpu_spec->mmu_features |= MMU_FTR_CI_LARGE_PAGE;

	return 1;
}

static int __init feat_enable_mma(struct dt_cpu_feature *f)
{
	u64 pcr;

	feat_enable(f);
	pcr = mfspr(SPRN_PCR);
	pcr &= ~PCR_MMA_DIS;
	mtspr(SPRN_PCR, pcr);

	return 1;
}

struct dt_cpu_feature_match {
	const char *name;
	int (*enable)(struct dt_cpu_feature *f);
	u64 cpu_ftr_bit_mask;
};

static struct dt_cpu_feature_match __initdata
		dt_cpu_feature_match_table[] = {
	{"hypervisor", feat_enable_hv, 0},
	{"big-endian", feat_enable, 0},
	{"little-endian", feat_enable_le, CPU_FTR_REAL_LE},
	{"smt", feat_enable_smt, 0},
	{"interrupt-facilities", feat_enable, 0},
	{"timer-facilities", feat_enable, 0},
	{"timer-facilities-v3", feat_enable, 0},
	{"debug-facilities", feat_enable, 0},
	{"come-from-address-register", feat_enable, CPU_FTR_CFAR},
	{"branch-tracing", feat_enable, 0},
	{"floating-point", feat_enable_fp, 0},
	{"vector", feat_enable_vector, 0},
	{"vector-scalar", feat_enable_vsx, 0},
	{"vector-scalar-v3", feat_enable, 0},
	{"decimal-floating-point", feat_enable, 0},
	{"decimal-integer", feat_enable, 0},
	{"quadword-load-store", feat_enable, 0},
	{"vector-crypto", feat_enable, 0},
	{"mmu-hash", feat_enable_mmu_hash, 0},
	{"mmu-radix", feat_enable_mmu_radix, 0},
	{"mmu-hash-v3", feat_enable_mmu_hash_v3, 0},
	{"virtual-page-class-key-protection", feat_enable, 0},
	{"transactional-memory", feat_enable_tm, CPU_FTR_TM},
	{"transactional-memory-v3", feat_enable_tm, 0},
	{"tm-suspend-hypervisor-assist", feat_enable, CPU_FTR_P9_TM_HV_ASSIST},
	{"tm-suspend-xer-so-bug", feat_enable, CPU_FTR_P9_TM_XER_SO_BUG},
	{"idle-nap", feat_enable_idle_nap, 0},
	{"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0},
	{"idle-stop", feat_enable_idle_stop, 0},
	{"machine-check-power8", feat_enable_mce_power8, 0},
	{"performance-monitor-power8", feat_enable_pmu_power8, 0},
	{"data-stream-control-register", feat_enable_dscr, CPU_FTR_DSCR},
	{"event-based-branch", feat_enable_ebb, 0},
	{"target-address-register", feat_enable, 0},
	{"branch-history-rolling-buffer", feat_enable, 0},
	{"control-register", feat_enable, CPU_FTR_CTRL},
	{"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL},
	{"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL},
	{"processor-utilization-of-resources-register", feat_enable_purr, 0},
	{"no-execute", feat_enable, 0},
	{"strong-access-ordering", feat_enable, CPU_FTR_SAO},
	{"cache-inhibited-large-page", feat_enable_large_ci, 0},
	{"coprocessor-icswx", feat_enable, 0},
	{"hypervisor-virtualization-interrupt", feat_enable_hvi, 0},
	{"program-priority-register", feat_enable, CPU_FTR_HAS_PPR},
	{"wait", feat_enable, 0},
	{"atomic-memory-operations", feat_enable, 0},
	{"branch-v3", feat_enable, 0},
	{"copy-paste", feat_enable, 0},
	{"decimal-floating-point-v3", feat_enable, 0},
	{"decimal-integer-v3", feat_enable, 0},
	{"fixed-point-v3", feat_enable, 0},
	{"floating-point-v3", feat_enable, 0},
	{"group-start-register", feat_enable, 0},
	{"pc-relative-addressing", feat_enable, 0},
	{"machine-check-power9", feat_enable_mce_power9, 0},
	{"performance-monitor-power9", feat_enable_pmu_power9, 0},
	{"event-based-branch-v3", feat_enable, 0},
	{"random-number-generator", feat_enable, 0},
	{"system-call-vectored", feat_disable, 0},
	{"trace-interrupt-v3", feat_enable, 0},
	{"vector-v3", feat_enable, 0},
	{"vector-binary128", feat_enable, 0},
	{"vector-binary16", feat_enable, 0},
	{"wait-v3", feat_enable, 0},
	{"prefix-instructions", feat_enable, 0},
	{"matrix-multiply-assist", feat_enable_mma, 0},
};

static bool __initdata using_dt_cpu_ftrs;
static bool __initdata enable_unknown = true;

static int __init dt_cpu_ftrs_parse(char *str)
{
	if (!str)
		return 0;

	if (!strcmp(str, "off"))
		using_dt_cpu_ftrs = false;
	else if (!strcmp(str, "known"))
		enable_unknown = false;
	else
		return 1;

	return 0;
}
early_param("dt_cpu_ftrs", dt_cpu_ftrs_parse);

static void __init cpufeatures_setup_start(u32 isa)
{
	pr_info("setup for ISA %d\n", isa);

	if (isa >= 3000) {
		cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300;
		cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00;
	}

	if (isa >= 3100) {
		cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_31;
		cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_1;
	}
}

static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f)
{
	const struct dt_cpu_feature_match *m;
	bool known = false;
	int i;

	for (i = 0; i < ARRAY_SIZE(dt_cpu_feature_match_table); i++) {
		m = &dt_cpu_feature_match_table[i];
		if (!strcmp(f->name, m->name)) {
			known = true;
			if (m->enable(f)) {
				cur_cpu_spec->cpu_features |= m->cpu_ftr_bit_mask;
				break;
			}

			pr_info("not enabling: %s (disabled or unsupported by kernel)\n",
				f->name);
			return false;
		}
	}

	if (!known && (!enable_unknown || !feat_try_enable_unknown(f))) {
		pr_info("not enabling: %s (unknown and unsupported by kernel)\n",
			f->name);
		return false;
	}

	if (known)
		pr_debug("enabling: %s\n", f->name);
	else
		pr_debug("enabling: %s (unknown)\n", f->name);

	return true;
}

/*
 * Handle POWER9 broadcast tlbie invalidation issue using
 * cpu feature flag.
 */
static __init void update_tlbie_feature_flag(unsigned long pvr)
{
	if (PVR_VER(pvr) == PVR_POWER9) {
		/*
		 * Set the tlbie feature flag for anything below
		 * Nimbus DD 2.3 and Cumulus DD 1.3
		 */
		if ((pvr & 0xe000) == 0) {
			/* Nimbus */
			if ((pvr & 0xfff) < 0x203)
				cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
		} else if ((pvr & 0xc000) == 0) {
			/* Cumulus */
			if ((pvr & 0xfff) < 0x103)
				cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
		} else {
			WARN_ONCE(1, "Unknown PVR");
			cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
		}

		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_ERAT_BUG;
	}
}

static __init void cpufeatures_cpu_quirks(void)
{
	unsigned long version = mfspr(SPRN_PVR);

	/*
	 * Not all quirks can be derived from the cpufeatures device tree.
	 */
	if ((version & 0xffffefff) == 0x004e0200) {
		/* DD2.0 has no feature flag */
		cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
	} else if ((version & 0xffffefff) == 0x004e0201) {
		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
		cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
	} else if ((version & 0xffffefff) == 0x004e0202) {
		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST;
		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG;
		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
	} else if ((version & 0xffff0000) == 0x004e0000) {
		/* DD2.1 and up have DD2_1 */
		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
	}

	if ((version & 0xffff0000) == 0x004e0000) {
		cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR);
		cur_cpu_spec->cpu_features |= CPU_FTR_P9_TIDR;
	}

	update_tlbie_feature_flag(version);
	/*
	 * PKEY was not in the initial base or feature node
	 * specification, but it should become optional in the next
	 * cpu feature version sequence.
	 */
	cur_cpu_spec->cpu_features |= CPU_FTR_PKEY;
}

static void __init cpufeatures_setup_finished(void)
{
	cpufeatures_cpu_quirks();

	if (hv_mode && !(cur_cpu_spec->cpu_features & CPU_FTR_HVMODE)) {
		pr_err("hypervisor not present in device tree but HV mode is enabled in the CPU. Enabling.\n");
		cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
	}

	/* Make sure powerpc_base_platform is non-NULL */
	powerpc_base_platform = cur_cpu_spec->platform;

	system_registers.lpcr = mfspr(SPRN_LPCR);
	system_registers.hfscr = mfspr(SPRN_HFSCR);
	system_registers.fscr = mfspr(SPRN_FSCR);
	system_registers.pcr = mfspr(SPRN_PCR);

	pr_info("final cpu/mmu features = 0x%016lx 0x%08x\n",
		cur_cpu_spec->cpu_features, cur_cpu_spec->mmu_features);
}

static int __init disabled_on_cmdline(void)
{
	unsigned long root, chosen;
	const char *p;

	root = of_get_flat_dt_root();
	chosen = of_get_flat_dt_subnode_by_name(root, "chosen");
	if (chosen == -FDT_ERR_NOTFOUND)
		return false;

	p = of_get_flat_dt_prop(chosen, "bootargs", NULL);
	if (!p)
		return false;

	if (strstr(p, "dt_cpu_ftrs=off"))
		return true;

	return false;
}

static int __init fdt_find_cpu_features(unsigned long node, const char *uname,
					int depth, void *data)
{
	if (of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features")
	    && of_get_flat_dt_prop(node, "isa", NULL))
		return 1;

	return 0;
}

bool __init dt_cpu_ftrs_in_use(void)
{
	return using_dt_cpu_ftrs;
}

bool __init dt_cpu_ftrs_init(void *fdt)
{
	using_dt_cpu_ftrs = false;

	/* Setup and verify the FDT, if it fails we just bail */
	if (!early_init_dt_verify(fdt))
		return false;

	if (!of_scan_flat_dt(fdt_find_cpu_features, NULL))
		return false;

	if (disabled_on_cmdline())
		return false;

	cpufeatures_setup_cpu();

	using_dt_cpu_ftrs = true;
	return true;
}

static int nr_dt_cpu_features;
static struct dt_cpu_feature *dt_cpu_features;

static int __init process_cpufeatures_node(unsigned long node,
					  const char *uname, int i)
{
	const __be32 *prop;
	struct dt_cpu_feature *f;
	int len;

	f = &dt_cpu_features[i];

	f->node = node;

	f->name = uname;

	prop = of_get_flat_dt_prop(node, "isa", &len);
	if (!prop) {
		pr_warn("%s: missing isa property\n", uname);
		return 0;
	}
	f->isa = be32_to_cpup(prop);

	prop = of_get_flat_dt_prop(node, "usable-privilege", &len);
	if (!prop) {
		pr_warn("%s: missing usable-privilege property", uname);
		return 0;
	}
	f->usable_privilege = be32_to_cpup(prop);

	prop = of_get_flat_dt_prop(node, "hv-support", &len);
	if (prop)
		f->hv_support = be32_to_cpup(prop);
	else
		f->hv_support = HV_SUPPORT_NONE;

	prop = of_get_flat_dt_prop(node, "os-support", &len);
	if (prop)
		f->os_support = be32_to_cpup(prop);
	else
		f->os_support = OS_SUPPORT_NONE;

	prop = of_get_flat_dt_prop(node, "hfscr-bit-nr", &len);
	if (prop)
		f->hfscr_bit_nr = be32_to_cpup(prop);
	else
		f->hfscr_bit_nr = -1;
	prop = of_get_flat_dt_prop(node, "fscr-bit-nr", &len);
	if (prop)
		f->fscr_bit_nr = be32_to_cpup(prop);
	else
		f->fscr_bit_nr = -1;
	prop = of_get_flat_dt_prop(node, "hwcap-bit-nr", &len);
	if (prop)
		f->hwcap_bit_nr = be32_to_cpup(prop);
	else
		f->hwcap_bit_nr = -1;

	if (f->usable_privilege & USABLE_HV) {
		if (!(mfmsr() & MSR_HV)) {
			pr_warn("%s: HV feature passed to guest\n", uname);
			return 0;
		}

		if (f->hv_support == HV_SUPPORT_NONE && f->hfscr_bit_nr != -1) {
			pr_warn("%s: unwanted hfscr_bit_nr\n", uname);
			return 0;
		}

		if (f->hv_support == HV_SUPPORT_HFSCR) {
			if (f->hfscr_bit_nr == -1) {
				pr_warn("%s: missing hfscr_bit_nr\n", uname);
				return 0;
			}
		}
	} else {
		if (f->hv_support != HV_SUPPORT_NONE || f->hfscr_bit_nr != -1) {
			pr_warn("%s: unwanted hv_support/hfscr_bit_nr\n", uname);
			return 0;
		}
	}

	if (f->usable_privilege & USABLE_OS) {
		if (f->os_support == OS_SUPPORT_NONE && f->fscr_bit_nr != -1) {
			pr_warn("%s: unwanted fscr_bit_nr\n", uname);
			return 0;
		}

		if (f->os_support == OS_SUPPORT_FSCR) {
			if (f->fscr_bit_nr == -1) {
				pr_warn("%s: missing fscr_bit_nr\n", uname);
				return 0;
			}
		}
	} else {
		if (f->os_support != OS_SUPPORT_NONE || f->fscr_bit_nr != -1) {
			pr_warn("%s: unwanted os_support/fscr_bit_nr\n", uname);
			return 0;
		}
	}

	if (!(f->usable_privilege & USABLE_PR)) {
		if (f->hwcap_bit_nr != -1) {
			pr_warn("%s: unwanted hwcap_bit_nr\n", uname);
			return 0;
		}
	}

	/* Do all the independent features in the first pass */
	if (!of_get_flat_dt_prop(node, "dependencies", &len)) {
		if (cpufeatures_process_feature(f))
			f->enabled = 1;
		else
			f->disabled = 1;
	}

	return 0;
}

static void __init cpufeatures_deps_enable(struct dt_cpu_feature *f)
{
	const __be32 *prop;
	int len;
	int nr_deps;
	int i;

	if (f->enabled || f->disabled)
		return;

	prop = of_get_flat_dt_prop(f->node, "dependencies", &len);
	if (!prop) {
		pr_warn("%s: missing dependencies property", f->name);
		return;
	}

	nr_deps = len / sizeof(int);

	for (i = 0; i < nr_deps; i++) {
		unsigned long phandle = be32_to_cpu(prop[i]);
		int j;

		for (j = 0; j < nr_dt_cpu_features; j++) {
			struct dt_cpu_feature *d = &dt_cpu_features[j];

			if (of_get_flat_dt_phandle(d->node) == phandle) {
				cpufeatures_deps_enable(d);
				if (d->disabled) {
					f->disabled = 1;
					return;
				}
			}
		}
	}

	if (cpufeatures_process_feature(f))
		f->enabled = 1;
	else
		f->disabled = 1;
}

static int __init scan_cpufeatures_subnodes(unsigned long node,
					  const char *uname,
					  void *data)
{
	int *count = data;

	process_cpufeatures_node(node, uname, *count);

	(*count)++;

	return 0;
}

static int __init count_cpufeatures_subnodes(unsigned long node,
					  const char *uname,
					  void *data)
{
	int *count = data;

	(*count)++;

	return 0;
}

static int __init dt_cpu_ftrs_scan_callback(unsigned long node, const char
					    *uname, int depth, void *data)
{
	const __be32 *prop;
	int count, i;
	u32 isa;

	/* We are scanning "ibm,powerpc-cpu-features" nodes only */
	if (!of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features"))
		return 0;

	prop = of_get_flat_dt_prop(node, "isa", NULL);
	if (!prop)
		/* We checked before, "can't happen" */
		return 0;

	isa = be32_to_cpup(prop);

	/* Count and allocate space for cpu features */
	of_scan_flat_dt_subnodes(node, count_cpufeatures_subnodes,
						&nr_dt_cpu_features);
	dt_cpu_features = memblock_alloc(sizeof(struct dt_cpu_feature) * nr_dt_cpu_features, PAGE_SIZE);
	if (!dt_cpu_features)
		panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
		      __func__,
		      sizeof(struct dt_cpu_feature) * nr_dt_cpu_features,
		      PAGE_SIZE);

	cpufeatures_setup_start(isa);

	/* Scan nodes into dt_cpu_features and enable those without deps  */
	count = 0;
	of_scan_flat_dt_subnodes(node, scan_cpufeatures_subnodes, &count);

	/* Recursive enable remaining features with dependencies */
	for (i = 0; i < nr_dt_cpu_features; i++) {
		struct dt_cpu_feature *f = &dt_cpu_features[i];

		cpufeatures_deps_enable(f);
	}

	prop = of_get_flat_dt_prop(node, "display-name", NULL);
	if (prop && strlen((char *)prop) != 0) {
		strlcpy(dt_cpu_name, (char *)prop, sizeof(dt_cpu_name));
		cur_cpu_spec->cpu_name = dt_cpu_name;
	}

	cpufeatures_setup_finished();

	memblock_free(__pa(dt_cpu_features),
			sizeof(struct dt_cpu_feature)*nr_dt_cpu_features);

	return 0;
}

void __init dt_cpu_ftrs_scan(void)
{
	if (!using_dt_cpu_ftrs)
		return;

	of_scan_flat_dt(dt_cpu_ftrs_scan_callback, NULL);
}