Loading...
Note: File does not exist in v4.6.
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2017, Nicholas Piggin, IBM Corporation
4 */
5
6#define pr_fmt(fmt) "dt-cpu-ftrs: " fmt
7
8#include <linux/export.h>
9#include <linux/init.h>
10#include <linux/jump_label.h>
11#include <linux/libfdt.h>
12#include <linux/memblock.h>
13#include <linux/printk.h>
14#include <linux/sched.h>
15#include <linux/string.h>
16#include <linux/threads.h>
17
18#include <asm/cputable.h>
19#include <asm/dt_cpu_ftrs.h>
20#include <asm/mmu.h>
21#include <asm/oprofile_impl.h>
22#include <asm/prom.h>
23#include <asm/setup.h>
24
25
26/* Device-tree visible constants follow */
27#define ISA_V3_0B 3000
28#define ISA_V3_1 3100
29
30#define USABLE_PR (1U << 0)
31#define USABLE_OS (1U << 1)
32#define USABLE_HV (1U << 2)
33
34#define HV_SUPPORT_HFSCR (1U << 0)
35#define OS_SUPPORT_FSCR (1U << 0)
36
37/* For parsing, we define all bits set as "NONE" case */
38#define HV_SUPPORT_NONE 0xffffffffU
39#define OS_SUPPORT_NONE 0xffffffffU
40
41struct dt_cpu_feature {
42 const char *name;
43 uint32_t isa;
44 uint32_t usable_privilege;
45 uint32_t hv_support;
46 uint32_t os_support;
47 uint32_t hfscr_bit_nr;
48 uint32_t fscr_bit_nr;
49 uint32_t hwcap_bit_nr;
50 /* fdt parsing */
51 unsigned long node;
52 int enabled;
53 int disabled;
54};
55
56#define MMU_FTRS_HASH_BASE (MMU_FTRS_POWER8)
57
58#define COMMON_USER_BASE (PPC_FEATURE_32 | PPC_FEATURE_64 | \
59 PPC_FEATURE_ARCH_2_06 |\
60 PPC_FEATURE_ICACHE_SNOOP)
61#define COMMON_USER2_BASE (PPC_FEATURE2_ARCH_2_07 | \
62 PPC_FEATURE2_ISEL)
63/*
64 * Set up the base CPU
65 */
66
67static int hv_mode;
68
69static struct {
70 u64 lpcr;
71 u64 lpcr_clear;
72 u64 hfscr;
73 u64 fscr;
74 u64 pcr;
75} system_registers;
76
77static void (*init_pmu_registers)(void);
78
79static void __restore_cpu_cpufeatures(void)
80{
81 u64 lpcr;
82
83 /*
84 * LPCR is restored by the power on engine already. It can be changed
85 * after early init e.g., by radix enable, and we have no unified API
86 * for saving and restoring such SPRs.
87 *
88 * This ->restore hook should really be removed from idle and register
89 * restore moved directly into the idle restore code, because this code
90 * doesn't know how idle is implemented or what it needs restored here.
91 *
92 * The best we can do to accommodate secondary boot and idle restore
93 * for now is "or" LPCR with existing.
94 */
95 lpcr = mfspr(SPRN_LPCR);
96 lpcr |= system_registers.lpcr;
97 lpcr &= ~system_registers.lpcr_clear;
98 mtspr(SPRN_LPCR, lpcr);
99 if (hv_mode) {
100 mtspr(SPRN_LPID, 0);
101 mtspr(SPRN_HFSCR, system_registers.hfscr);
102 mtspr(SPRN_PCR, system_registers.pcr);
103 }
104 mtspr(SPRN_FSCR, system_registers.fscr);
105
106 if (init_pmu_registers)
107 init_pmu_registers();
108}
109
110static char dt_cpu_name[64];
111
112static struct cpu_spec __initdata base_cpu_spec = {
113 .cpu_name = NULL,
114 .cpu_features = CPU_FTRS_DT_CPU_BASE,
115 .cpu_user_features = COMMON_USER_BASE,
116 .cpu_user_features2 = COMMON_USER2_BASE,
117 .mmu_features = 0,
118 .icache_bsize = 32, /* minimum block size, fixed by */
119 .dcache_bsize = 32, /* cache info init. */
120 .num_pmcs = 0,
121 .pmc_type = PPC_PMC_DEFAULT,
122 .oprofile_cpu_type = NULL,
123 .oprofile_type = PPC_OPROFILE_INVALID,
124 .cpu_setup = NULL,
125 .cpu_restore = __restore_cpu_cpufeatures,
126 .machine_check_early = NULL,
127 .platform = NULL,
128};
129
130static void __init cpufeatures_setup_cpu(void)
131{
132 set_cur_cpu_spec(&base_cpu_spec);
133
134 cur_cpu_spec->pvr_mask = -1;
135 cur_cpu_spec->pvr_value = mfspr(SPRN_PVR);
136
137 /* Initialize the base environment -- clear FSCR/HFSCR. */
138 hv_mode = !!(mfmsr() & MSR_HV);
139 if (hv_mode) {
140 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
141 mtspr(SPRN_HFSCR, 0);
142 }
143 mtspr(SPRN_FSCR, 0);
144 mtspr(SPRN_PCR, PCR_MASK);
145
146 /*
147 * LPCR does not get cleared, to match behaviour with secondaries
148 * in __restore_cpu_cpufeatures. Once the idle code is fixed, this
149 * could clear LPCR too.
150 */
151}
152
153static int __init feat_try_enable_unknown(struct dt_cpu_feature *f)
154{
155 if (f->hv_support == HV_SUPPORT_NONE) {
156 } else if (f->hv_support & HV_SUPPORT_HFSCR) {
157 u64 hfscr = mfspr(SPRN_HFSCR);
158 hfscr |= 1UL << f->hfscr_bit_nr;
159 mtspr(SPRN_HFSCR, hfscr);
160 } else {
161 /* Does not have a known recipe */
162 return 0;
163 }
164
165 if (f->os_support == OS_SUPPORT_NONE) {
166 } else if (f->os_support & OS_SUPPORT_FSCR) {
167 u64 fscr = mfspr(SPRN_FSCR);
168 fscr |= 1UL << f->fscr_bit_nr;
169 mtspr(SPRN_FSCR, fscr);
170 } else {
171 /* Does not have a known recipe */
172 return 0;
173 }
174
175 if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
176 uint32_t word = f->hwcap_bit_nr / 32;
177 uint32_t bit = f->hwcap_bit_nr % 32;
178
179 if (word == 0)
180 cur_cpu_spec->cpu_user_features |= 1U << bit;
181 else if (word == 1)
182 cur_cpu_spec->cpu_user_features2 |= 1U << bit;
183 else
184 pr_err("%s could not advertise to user (no hwcap bits)\n", f->name);
185 }
186
187 return 1;
188}
189
190static int __init feat_enable(struct dt_cpu_feature *f)
191{
192 if (f->hv_support != HV_SUPPORT_NONE) {
193 if (f->hfscr_bit_nr != -1) {
194 u64 hfscr = mfspr(SPRN_HFSCR);
195 hfscr |= 1UL << f->hfscr_bit_nr;
196 mtspr(SPRN_HFSCR, hfscr);
197 }
198 }
199
200 if (f->os_support != OS_SUPPORT_NONE) {
201 if (f->fscr_bit_nr != -1) {
202 u64 fscr = mfspr(SPRN_FSCR);
203 fscr |= 1UL << f->fscr_bit_nr;
204 mtspr(SPRN_FSCR, fscr);
205 }
206 }
207
208 if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
209 uint32_t word = f->hwcap_bit_nr / 32;
210 uint32_t bit = f->hwcap_bit_nr % 32;
211
212 if (word == 0)
213 cur_cpu_spec->cpu_user_features |= 1U << bit;
214 else if (word == 1)
215 cur_cpu_spec->cpu_user_features2 |= 1U << bit;
216 else
217 pr_err("CPU feature: %s could not advertise to user (no hwcap bits)\n", f->name);
218 }
219
220 return 1;
221}
222
223static int __init feat_disable(struct dt_cpu_feature *f)
224{
225 return 0;
226}
227
228static int __init feat_enable_hv(struct dt_cpu_feature *f)
229{
230 u64 lpcr;
231
232 if (!hv_mode) {
233 pr_err("CPU feature hypervisor present in device tree but HV mode not enabled in the CPU. Ignoring.\n");
234 return 0;
235 }
236
237 mtspr(SPRN_LPID, 0);
238
239 lpcr = mfspr(SPRN_LPCR);
240 lpcr &= ~LPCR_LPES0; /* HV external interrupts */
241 mtspr(SPRN_LPCR, lpcr);
242
243 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
244
245 return 1;
246}
247
248static int __init feat_enable_le(struct dt_cpu_feature *f)
249{
250 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_TRUE_LE;
251 return 1;
252}
253
254static int __init feat_enable_smt(struct dt_cpu_feature *f)
255{
256 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
257 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_SMT;
258 return 1;
259}
260
261static int __init feat_enable_idle_nap(struct dt_cpu_feature *f)
262{
263 u64 lpcr;
264
265 /* Set PECE wakeup modes for ISA 207 */
266 lpcr = mfspr(SPRN_LPCR);
267 lpcr |= LPCR_PECE0;
268 lpcr |= LPCR_PECE1;
269 lpcr |= LPCR_PECE2;
270 mtspr(SPRN_LPCR, lpcr);
271
272 return 1;
273}
274
275static int __init feat_enable_align_dsisr(struct dt_cpu_feature *f)
276{
277 cur_cpu_spec->cpu_features &= ~CPU_FTR_NODSISRALIGN;
278
279 return 1;
280}
281
282static int __init feat_enable_idle_stop(struct dt_cpu_feature *f)
283{
284 u64 lpcr;
285
286 /* Set PECE wakeup modes for ISAv3.0B */
287 lpcr = mfspr(SPRN_LPCR);
288 lpcr |= LPCR_PECE0;
289 lpcr |= LPCR_PECE1;
290 lpcr |= LPCR_PECE2;
291 mtspr(SPRN_LPCR, lpcr);
292
293 return 1;
294}
295
296static int __init feat_enable_mmu_hash(struct dt_cpu_feature *f)
297{
298 u64 lpcr;
299
300 lpcr = mfspr(SPRN_LPCR);
301 lpcr &= ~LPCR_ISL;
302
303 /* VRMASD */
304 lpcr |= LPCR_VPM0;
305 lpcr &= ~LPCR_VPM1;
306 lpcr |= 0x10UL << LPCR_VRMASD_SH; /* L=1 LP=00 */
307 mtspr(SPRN_LPCR, lpcr);
308
309 cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
310 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
311
312 return 1;
313}
314
315static int __init feat_enable_mmu_hash_v3(struct dt_cpu_feature *f)
316{
317 u64 lpcr;
318
319 system_registers.lpcr_clear |= (LPCR_ISL | LPCR_UPRT | LPCR_HR);
320 lpcr = mfspr(SPRN_LPCR);
321 lpcr &= ~(LPCR_ISL | LPCR_UPRT | LPCR_HR);
322 mtspr(SPRN_LPCR, lpcr);
323
324 cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
325 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
326
327 return 1;
328}
329
330
331static int __init feat_enable_mmu_radix(struct dt_cpu_feature *f)
332{
333#ifdef CONFIG_PPC_RADIX_MMU
334 cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX;
335 cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
336 cur_cpu_spec->mmu_features |= MMU_FTR_GTSE;
337 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
338
339 return 1;
340#endif
341 return 0;
342}
343
344static int __init feat_enable_dscr(struct dt_cpu_feature *f)
345{
346 u64 lpcr;
347
348 /*
349 * Linux relies on FSCR[DSCR] being clear, so that we can take the
350 * facility unavailable interrupt and track the task's usage of DSCR.
351 * See facility_unavailable_exception().
352 * Clear the bit here so that feat_enable() doesn't set it.
353 */
354 f->fscr_bit_nr = -1;
355
356 feat_enable(f);
357
358 lpcr = mfspr(SPRN_LPCR);
359 lpcr &= ~LPCR_DPFD;
360 lpcr |= (4UL << LPCR_DPFD_SH);
361 mtspr(SPRN_LPCR, lpcr);
362
363 return 1;
364}
365
366static void hfscr_pmu_enable(void)
367{
368 u64 hfscr = mfspr(SPRN_HFSCR);
369 hfscr |= PPC_BIT(60);
370 mtspr(SPRN_HFSCR, hfscr);
371}
372
373static void init_pmu_power8(void)
374{
375 if (hv_mode) {
376 mtspr(SPRN_MMCRC, 0);
377 mtspr(SPRN_MMCRH, 0);
378 }
379
380 mtspr(SPRN_MMCRA, 0);
381 mtspr(SPRN_MMCR0, 0);
382 mtspr(SPRN_MMCR1, 0);
383 mtspr(SPRN_MMCR2, 0);
384 mtspr(SPRN_MMCRS, 0);
385}
386
387static int __init feat_enable_mce_power8(struct dt_cpu_feature *f)
388{
389 cur_cpu_spec->platform = "power8";
390 cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p8;
391
392 return 1;
393}
394
395static int __init feat_enable_pmu_power8(struct dt_cpu_feature *f)
396{
397 hfscr_pmu_enable();
398
399 init_pmu_power8();
400 init_pmu_registers = init_pmu_power8;
401
402 cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
403 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
404 if (pvr_version_is(PVR_POWER8E))
405 cur_cpu_spec->cpu_features |= CPU_FTR_PMAO_BUG;
406
407 cur_cpu_spec->num_pmcs = 6;
408 cur_cpu_spec->pmc_type = PPC_PMC_IBM;
409 cur_cpu_spec->oprofile_cpu_type = "ppc64/power8";
410
411 return 1;
412}
413
414static void init_pmu_power9(void)
415{
416 if (hv_mode)
417 mtspr(SPRN_MMCRC, 0);
418
419 mtspr(SPRN_MMCRA, 0);
420 mtspr(SPRN_MMCR0, 0);
421 mtspr(SPRN_MMCR1, 0);
422 mtspr(SPRN_MMCR2, 0);
423}
424
425static int __init feat_enable_mce_power9(struct dt_cpu_feature *f)
426{
427 cur_cpu_spec->platform = "power9";
428 cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p9;
429
430 return 1;
431}
432
433static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f)
434{
435 hfscr_pmu_enable();
436
437 init_pmu_power9();
438 init_pmu_registers = init_pmu_power9;
439
440 cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
441 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
442
443 cur_cpu_spec->num_pmcs = 6;
444 cur_cpu_spec->pmc_type = PPC_PMC_IBM;
445 cur_cpu_spec->oprofile_cpu_type = "ppc64/power9";
446
447 return 1;
448}
449
450static void init_pmu_power10(void)
451{
452 init_pmu_power9();
453
454 mtspr(SPRN_MMCR3, 0);
455 mtspr(SPRN_MMCRA, MMCRA_BHRB_DISABLE);
456}
457
458static int __init feat_enable_pmu_power10(struct dt_cpu_feature *f)
459{
460 hfscr_pmu_enable();
461
462 init_pmu_power10();
463 init_pmu_registers = init_pmu_power10;
464
465 cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
466 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
467
468 cur_cpu_spec->num_pmcs = 6;
469 cur_cpu_spec->pmc_type = PPC_PMC_IBM;
470 cur_cpu_spec->oprofile_cpu_type = "ppc64/power10";
471
472 return 1;
473}
474
475static int __init feat_enable_mce_power10(struct dt_cpu_feature *f)
476{
477 cur_cpu_spec->platform = "power10";
478 cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p10;
479
480 return 1;
481}
482
483static int __init feat_enable_tm(struct dt_cpu_feature *f)
484{
485#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
486 feat_enable(f);
487 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NOSC;
488 return 1;
489#endif
490 return 0;
491}
492
493static int __init feat_enable_fp(struct dt_cpu_feature *f)
494{
495 feat_enable(f);
496 cur_cpu_spec->cpu_features &= ~CPU_FTR_FPU_UNAVAILABLE;
497
498 return 1;
499}
500
501static int __init feat_enable_vector(struct dt_cpu_feature *f)
502{
503#ifdef CONFIG_ALTIVEC
504 feat_enable(f);
505 cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
506 cur_cpu_spec->cpu_features |= CPU_FTR_VMX_COPY;
507 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
508
509 return 1;
510#endif
511 return 0;
512}
513
514static int __init feat_enable_vsx(struct dt_cpu_feature *f)
515{
516#ifdef CONFIG_VSX
517 feat_enable(f);
518 cur_cpu_spec->cpu_features |= CPU_FTR_VSX;
519 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_VSX;
520
521 return 1;
522#endif
523 return 0;
524}
525
526static int __init feat_enable_purr(struct dt_cpu_feature *f)
527{
528 cur_cpu_spec->cpu_features |= CPU_FTR_PURR | CPU_FTR_SPURR;
529
530 return 1;
531}
532
533static int __init feat_enable_ebb(struct dt_cpu_feature *f)
534{
535 /*
536 * PPC_FEATURE2_EBB is enabled in PMU init code because it has
537 * historically been related to the PMU facility. This may have
538 * to be decoupled if EBB becomes more generic. For now, follow
539 * existing convention.
540 */
541 f->hwcap_bit_nr = -1;
542 feat_enable(f);
543
544 return 1;
545}
546
547static int __init feat_enable_dbell(struct dt_cpu_feature *f)
548{
549 u64 lpcr;
550
551 /* P9 has an HFSCR for privileged state */
552 feat_enable(f);
553
554 cur_cpu_spec->cpu_features |= CPU_FTR_DBELL;
555
556 lpcr = mfspr(SPRN_LPCR);
557 lpcr |= LPCR_PECEDH; /* hyp doorbell wakeup */
558 mtspr(SPRN_LPCR, lpcr);
559
560 return 1;
561}
562
563static int __init feat_enable_hvi(struct dt_cpu_feature *f)
564{
565 u64 lpcr;
566
567 /*
568 * POWER9 XIVE interrupts including in OPAL XICS compatibility
569 * are always delivered as hypervisor virtualization interrupts (HVI)
570 * rather than EE.
571 *
572 * However LPES0 is not set here, in the chance that an EE does get
573 * delivered to the host somehow, the EE handler would not expect it
574 * to be delivered in LPES0 mode (e.g., using SRR[01]). This could
575 * happen if there is a bug in interrupt controller code, or IC is
576 * misconfigured in systemsim.
577 */
578
579 lpcr = mfspr(SPRN_LPCR);
580 lpcr |= LPCR_HVICE; /* enable hvi interrupts */
581 lpcr |= LPCR_HEIC; /* disable ee interrupts when MSR_HV */
582 lpcr |= LPCR_PECE_HVEE; /* hvi can wake from stop */
583 mtspr(SPRN_LPCR, lpcr);
584
585 return 1;
586}
587
588static int __init feat_enable_large_ci(struct dt_cpu_feature *f)
589{
590 cur_cpu_spec->mmu_features |= MMU_FTR_CI_LARGE_PAGE;
591
592 return 1;
593}
594
595static int __init feat_enable_mma(struct dt_cpu_feature *f)
596{
597 u64 pcr;
598
599 feat_enable(f);
600 pcr = mfspr(SPRN_PCR);
601 pcr &= ~PCR_MMA_DIS;
602 mtspr(SPRN_PCR, pcr);
603
604 return 1;
605}
606
607struct dt_cpu_feature_match {
608 const char *name;
609 int (*enable)(struct dt_cpu_feature *f);
610 u64 cpu_ftr_bit_mask;
611};
612
613static struct dt_cpu_feature_match __initdata
614 dt_cpu_feature_match_table[] = {
615 {"hypervisor", feat_enable_hv, 0},
616 {"big-endian", feat_enable, 0},
617 {"little-endian", feat_enable_le, CPU_FTR_REAL_LE},
618 {"smt", feat_enable_smt, 0},
619 {"interrupt-facilities", feat_enable, 0},
620 {"system-call-vectored", feat_enable, 0},
621 {"timer-facilities", feat_enable, 0},
622 {"timer-facilities-v3", feat_enable, 0},
623 {"debug-facilities", feat_enable, 0},
624 {"come-from-address-register", feat_enable, CPU_FTR_CFAR},
625 {"branch-tracing", feat_enable, 0},
626 {"floating-point", feat_enable_fp, 0},
627 {"vector", feat_enable_vector, 0},
628 {"vector-scalar", feat_enable_vsx, 0},
629 {"vector-scalar-v3", feat_enable, 0},
630 {"decimal-floating-point", feat_enable, 0},
631 {"decimal-integer", feat_enable, 0},
632 {"quadword-load-store", feat_enable, 0},
633 {"vector-crypto", feat_enable, 0},
634 {"mmu-hash", feat_enable_mmu_hash, 0},
635 {"mmu-radix", feat_enable_mmu_radix, 0},
636 {"mmu-hash-v3", feat_enable_mmu_hash_v3, 0},
637 {"virtual-page-class-key-protection", feat_enable, 0},
638 {"transactional-memory", feat_enable_tm, CPU_FTR_TM},
639 {"transactional-memory-v3", feat_enable_tm, 0},
640 {"tm-suspend-hypervisor-assist", feat_enable, CPU_FTR_P9_TM_HV_ASSIST},
641 {"tm-suspend-xer-so-bug", feat_enable, CPU_FTR_P9_TM_XER_SO_BUG},
642 {"idle-nap", feat_enable_idle_nap, 0},
643 {"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0},
644 {"idle-stop", feat_enable_idle_stop, 0},
645 {"machine-check-power8", feat_enable_mce_power8, 0},
646 {"performance-monitor-power8", feat_enable_pmu_power8, 0},
647 {"data-stream-control-register", feat_enable_dscr, CPU_FTR_DSCR},
648 {"event-based-branch", feat_enable_ebb, 0},
649 {"target-address-register", feat_enable, 0},
650 {"branch-history-rolling-buffer", feat_enable, 0},
651 {"control-register", feat_enable, CPU_FTR_CTRL},
652 {"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL},
653 {"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL},
654 {"processor-utilization-of-resources-register", feat_enable_purr, 0},
655 {"no-execute", feat_enable, 0},
656 {"strong-access-ordering", feat_enable, CPU_FTR_SAO},
657 {"cache-inhibited-large-page", feat_enable_large_ci, 0},
658 {"coprocessor-icswx", feat_enable, 0},
659 {"hypervisor-virtualization-interrupt", feat_enable_hvi, 0},
660 {"program-priority-register", feat_enable, CPU_FTR_HAS_PPR},
661 {"wait", feat_enable, 0},
662 {"atomic-memory-operations", feat_enable, 0},
663 {"branch-v3", feat_enable, 0},
664 {"copy-paste", feat_enable, 0},
665 {"decimal-floating-point-v3", feat_enable, 0},
666 {"decimal-integer-v3", feat_enable, 0},
667 {"fixed-point-v3", feat_enable, 0},
668 {"floating-point-v3", feat_enable, 0},
669 {"group-start-register", feat_enable, 0},
670 {"pc-relative-addressing", feat_enable, 0},
671 {"machine-check-power9", feat_enable_mce_power9, 0},
672 {"machine-check-power10", feat_enable_mce_power10, 0},
673 {"performance-monitor-power9", feat_enable_pmu_power9, 0},
674 {"performance-monitor-power10", feat_enable_pmu_power10, 0},
675 {"event-based-branch-v3", feat_enable, 0},
676 {"random-number-generator", feat_enable, 0},
677 {"system-call-vectored", feat_disable, 0},
678 {"trace-interrupt-v3", feat_enable, 0},
679 {"vector-v3", feat_enable, 0},
680 {"vector-binary128", feat_enable, 0},
681 {"vector-binary16", feat_enable, 0},
682 {"wait-v3", feat_enable, 0},
683 {"prefix-instructions", feat_enable, 0},
684 {"matrix-multiply-assist", feat_enable_mma, 0},
685 {"debug-facilities-v31", feat_enable, CPU_FTR_DAWR1},
686};
687
688static bool __initdata using_dt_cpu_ftrs;
689static bool __initdata enable_unknown = true;
690
691static int __init dt_cpu_ftrs_parse(char *str)
692{
693 if (!str)
694 return 0;
695
696 if (!strcmp(str, "off"))
697 using_dt_cpu_ftrs = false;
698 else if (!strcmp(str, "known"))
699 enable_unknown = false;
700 else
701 return 1;
702
703 return 0;
704}
705early_param("dt_cpu_ftrs", dt_cpu_ftrs_parse);
706
707static void __init cpufeatures_setup_start(u32 isa)
708{
709 pr_info("setup for ISA %d\n", isa);
710
711 if (isa >= ISA_V3_0B) {
712 cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300;
713 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00;
714 }
715
716 if (isa >= ISA_V3_1) {
717 cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_31;
718 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_1;
719 }
720}
721
722static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f)
723{
724 const struct dt_cpu_feature_match *m;
725 bool known = false;
726 int i;
727
728 for (i = 0; i < ARRAY_SIZE(dt_cpu_feature_match_table); i++) {
729 m = &dt_cpu_feature_match_table[i];
730 if (!strcmp(f->name, m->name)) {
731 known = true;
732 if (m->enable(f)) {
733 cur_cpu_spec->cpu_features |= m->cpu_ftr_bit_mask;
734 break;
735 }
736
737 pr_info("not enabling: %s (disabled or unsupported by kernel)\n",
738 f->name);
739 return false;
740 }
741 }
742
743 if (!known && (!enable_unknown || !feat_try_enable_unknown(f))) {
744 pr_info("not enabling: %s (unknown and unsupported by kernel)\n",
745 f->name);
746 return false;
747 }
748
749 if (known)
750 pr_debug("enabling: %s\n", f->name);
751 else
752 pr_debug("enabling: %s (unknown)\n", f->name);
753
754 return true;
755}
756
757/*
758 * Handle POWER9 broadcast tlbie invalidation issue using
759 * cpu feature flag.
760 */
761static __init void update_tlbie_feature_flag(unsigned long pvr)
762{
763 if (PVR_VER(pvr) == PVR_POWER9) {
764 /*
765 * Set the tlbie feature flag for anything below
766 * Nimbus DD 2.3 and Cumulus DD 1.3
767 */
768 if ((pvr & 0xe000) == 0) {
769 /* Nimbus */
770 if ((pvr & 0xfff) < 0x203)
771 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
772 } else if ((pvr & 0xc000) == 0) {
773 /* Cumulus */
774 if ((pvr & 0xfff) < 0x103)
775 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
776 } else {
777 WARN_ONCE(1, "Unknown PVR");
778 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
779 }
780
781 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_ERAT_BUG;
782 }
783}
784
785static __init void cpufeatures_cpu_quirks(void)
786{
787 unsigned long version = mfspr(SPRN_PVR);
788
789 /*
790 * Not all quirks can be derived from the cpufeatures device tree.
791 */
792 if ((version & 0xffffefff) == 0x004e0200) {
793 /* DD2.0 has no feature flag */
794 cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
795 } else if ((version & 0xffffefff) == 0x004e0201) {
796 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
797 cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
798 } else if ((version & 0xffffefff) == 0x004e0202) {
799 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST;
800 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG;
801 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
802 } else if ((version & 0xffff0000) == 0x004e0000) {
803 /* DD2.1 and up have DD2_1 */
804 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
805 }
806
807 if ((version & 0xffff0000) == 0x004e0000) {
808 cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR);
809 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TIDR;
810 }
811
812 update_tlbie_feature_flag(version);
813}
814
815static void __init cpufeatures_setup_finished(void)
816{
817 cpufeatures_cpu_quirks();
818
819 if (hv_mode && !(cur_cpu_spec->cpu_features & CPU_FTR_HVMODE)) {
820 pr_err("hypervisor not present in device tree but HV mode is enabled in the CPU. Enabling.\n");
821 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
822 }
823
824 /* Make sure powerpc_base_platform is non-NULL */
825 powerpc_base_platform = cur_cpu_spec->platform;
826
827 system_registers.lpcr = mfspr(SPRN_LPCR);
828 system_registers.hfscr = mfspr(SPRN_HFSCR);
829 system_registers.fscr = mfspr(SPRN_FSCR);
830 system_registers.pcr = mfspr(SPRN_PCR);
831
832 pr_info("final cpu/mmu features = 0x%016lx 0x%08x\n",
833 cur_cpu_spec->cpu_features, cur_cpu_spec->mmu_features);
834}
835
836static int __init disabled_on_cmdline(void)
837{
838 unsigned long root, chosen;
839 const char *p;
840
841 root = of_get_flat_dt_root();
842 chosen = of_get_flat_dt_subnode_by_name(root, "chosen");
843 if (chosen == -FDT_ERR_NOTFOUND)
844 return false;
845
846 p = of_get_flat_dt_prop(chosen, "bootargs", NULL);
847 if (!p)
848 return false;
849
850 if (strstr(p, "dt_cpu_ftrs=off"))
851 return true;
852
853 return false;
854}
855
856static int __init fdt_find_cpu_features(unsigned long node, const char *uname,
857 int depth, void *data)
858{
859 if (of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features")
860 && of_get_flat_dt_prop(node, "isa", NULL))
861 return 1;
862
863 return 0;
864}
865
866bool __init dt_cpu_ftrs_in_use(void)
867{
868 return using_dt_cpu_ftrs;
869}
870
871bool __init dt_cpu_ftrs_init(void *fdt)
872{
873 using_dt_cpu_ftrs = false;
874
875 /* Setup and verify the FDT, if it fails we just bail */
876 if (!early_init_dt_verify(fdt))
877 return false;
878
879 if (!of_scan_flat_dt(fdt_find_cpu_features, NULL))
880 return false;
881
882 if (disabled_on_cmdline())
883 return false;
884
885 cpufeatures_setup_cpu();
886
887 using_dt_cpu_ftrs = true;
888 return true;
889}
890
891static int nr_dt_cpu_features;
892static struct dt_cpu_feature *dt_cpu_features;
893
894static int __init process_cpufeatures_node(unsigned long node,
895 const char *uname, int i)
896{
897 const __be32 *prop;
898 struct dt_cpu_feature *f;
899 int len;
900
901 f = &dt_cpu_features[i];
902
903 f->node = node;
904
905 f->name = uname;
906
907 prop = of_get_flat_dt_prop(node, "isa", &len);
908 if (!prop) {
909 pr_warn("%s: missing isa property\n", uname);
910 return 0;
911 }
912 f->isa = be32_to_cpup(prop);
913
914 prop = of_get_flat_dt_prop(node, "usable-privilege", &len);
915 if (!prop) {
916 pr_warn("%s: missing usable-privilege property", uname);
917 return 0;
918 }
919 f->usable_privilege = be32_to_cpup(prop);
920
921 prop = of_get_flat_dt_prop(node, "hv-support", &len);
922 if (prop)
923 f->hv_support = be32_to_cpup(prop);
924 else
925 f->hv_support = HV_SUPPORT_NONE;
926
927 prop = of_get_flat_dt_prop(node, "os-support", &len);
928 if (prop)
929 f->os_support = be32_to_cpup(prop);
930 else
931 f->os_support = OS_SUPPORT_NONE;
932
933 prop = of_get_flat_dt_prop(node, "hfscr-bit-nr", &len);
934 if (prop)
935 f->hfscr_bit_nr = be32_to_cpup(prop);
936 else
937 f->hfscr_bit_nr = -1;
938 prop = of_get_flat_dt_prop(node, "fscr-bit-nr", &len);
939 if (prop)
940 f->fscr_bit_nr = be32_to_cpup(prop);
941 else
942 f->fscr_bit_nr = -1;
943 prop = of_get_flat_dt_prop(node, "hwcap-bit-nr", &len);
944 if (prop)
945 f->hwcap_bit_nr = be32_to_cpup(prop);
946 else
947 f->hwcap_bit_nr = -1;
948
949 if (f->usable_privilege & USABLE_HV) {
950 if (!(mfmsr() & MSR_HV)) {
951 pr_warn("%s: HV feature passed to guest\n", uname);
952 return 0;
953 }
954
955 if (f->hv_support == HV_SUPPORT_NONE && f->hfscr_bit_nr != -1) {
956 pr_warn("%s: unwanted hfscr_bit_nr\n", uname);
957 return 0;
958 }
959
960 if (f->hv_support == HV_SUPPORT_HFSCR) {
961 if (f->hfscr_bit_nr == -1) {
962 pr_warn("%s: missing hfscr_bit_nr\n", uname);
963 return 0;
964 }
965 }
966 } else {
967 if (f->hv_support != HV_SUPPORT_NONE || f->hfscr_bit_nr != -1) {
968 pr_warn("%s: unwanted hv_support/hfscr_bit_nr\n", uname);
969 return 0;
970 }
971 }
972
973 if (f->usable_privilege & USABLE_OS) {
974 if (f->os_support == OS_SUPPORT_NONE && f->fscr_bit_nr != -1) {
975 pr_warn("%s: unwanted fscr_bit_nr\n", uname);
976 return 0;
977 }
978
979 if (f->os_support == OS_SUPPORT_FSCR) {
980 if (f->fscr_bit_nr == -1) {
981 pr_warn("%s: missing fscr_bit_nr\n", uname);
982 return 0;
983 }
984 }
985 } else {
986 if (f->os_support != OS_SUPPORT_NONE || f->fscr_bit_nr != -1) {
987 pr_warn("%s: unwanted os_support/fscr_bit_nr\n", uname);
988 return 0;
989 }
990 }
991
992 if (!(f->usable_privilege & USABLE_PR)) {
993 if (f->hwcap_bit_nr != -1) {
994 pr_warn("%s: unwanted hwcap_bit_nr\n", uname);
995 return 0;
996 }
997 }
998
999 /* Do all the independent features in the first pass */
1000 if (!of_get_flat_dt_prop(node, "dependencies", &len)) {
1001 if (cpufeatures_process_feature(f))
1002 f->enabled = 1;
1003 else
1004 f->disabled = 1;
1005 }
1006
1007 return 0;
1008}
1009
1010static void __init cpufeatures_deps_enable(struct dt_cpu_feature *f)
1011{
1012 const __be32 *prop;
1013 int len;
1014 int nr_deps;
1015 int i;
1016
1017 if (f->enabled || f->disabled)
1018 return;
1019
1020 prop = of_get_flat_dt_prop(f->node, "dependencies", &len);
1021 if (!prop) {
1022 pr_warn("%s: missing dependencies property", f->name);
1023 return;
1024 }
1025
1026 nr_deps = len / sizeof(int);
1027
1028 for (i = 0; i < nr_deps; i++) {
1029 unsigned long phandle = be32_to_cpu(prop[i]);
1030 int j;
1031
1032 for (j = 0; j < nr_dt_cpu_features; j++) {
1033 struct dt_cpu_feature *d = &dt_cpu_features[j];
1034
1035 if (of_get_flat_dt_phandle(d->node) == phandle) {
1036 cpufeatures_deps_enable(d);
1037 if (d->disabled) {
1038 f->disabled = 1;
1039 return;
1040 }
1041 }
1042 }
1043 }
1044
1045 if (cpufeatures_process_feature(f))
1046 f->enabled = 1;
1047 else
1048 f->disabled = 1;
1049}
1050
1051static int __init scan_cpufeatures_subnodes(unsigned long node,
1052 const char *uname,
1053 void *data)
1054{
1055 int *count = data;
1056
1057 process_cpufeatures_node(node, uname, *count);
1058
1059 (*count)++;
1060
1061 return 0;
1062}
1063
1064static int __init count_cpufeatures_subnodes(unsigned long node,
1065 const char *uname,
1066 void *data)
1067{
1068 int *count = data;
1069
1070 (*count)++;
1071
1072 return 0;
1073}
1074
1075static int __init dt_cpu_ftrs_scan_callback(unsigned long node, const char
1076 *uname, int depth, void *data)
1077{
1078 const __be32 *prop;
1079 int count, i;
1080 u32 isa;
1081
1082 /* We are scanning "ibm,powerpc-cpu-features" nodes only */
1083 if (!of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features"))
1084 return 0;
1085
1086 prop = of_get_flat_dt_prop(node, "isa", NULL);
1087 if (!prop)
1088 /* We checked before, "can't happen" */
1089 return 0;
1090
1091 isa = be32_to_cpup(prop);
1092
1093 /* Count and allocate space for cpu features */
1094 of_scan_flat_dt_subnodes(node, count_cpufeatures_subnodes,
1095 &nr_dt_cpu_features);
1096 dt_cpu_features = memblock_alloc(sizeof(struct dt_cpu_feature) * nr_dt_cpu_features, PAGE_SIZE);
1097 if (!dt_cpu_features)
1098 panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
1099 __func__,
1100 sizeof(struct dt_cpu_feature) * nr_dt_cpu_features,
1101 PAGE_SIZE);
1102
1103 cpufeatures_setup_start(isa);
1104
1105 /* Scan nodes into dt_cpu_features and enable those without deps */
1106 count = 0;
1107 of_scan_flat_dt_subnodes(node, scan_cpufeatures_subnodes, &count);
1108
1109 /* Recursive enable remaining features with dependencies */
1110 for (i = 0; i < nr_dt_cpu_features; i++) {
1111 struct dt_cpu_feature *f = &dt_cpu_features[i];
1112
1113 cpufeatures_deps_enable(f);
1114 }
1115
1116 prop = of_get_flat_dt_prop(node, "display-name", NULL);
1117 if (prop && strlen((char *)prop) != 0) {
1118 strlcpy(dt_cpu_name, (char *)prop, sizeof(dt_cpu_name));
1119 cur_cpu_spec->cpu_name = dt_cpu_name;
1120 }
1121
1122 cpufeatures_setup_finished();
1123
1124 memblock_free(__pa(dt_cpu_features),
1125 sizeof(struct dt_cpu_feature)*nr_dt_cpu_features);
1126
1127 return 0;
1128}
1129
1130void __init dt_cpu_ftrs_scan(void)
1131{
1132 if (!using_dt_cpu_ftrs)
1133 return;
1134
1135 of_scan_flat_dt(dt_cpu_ftrs_scan_callback, NULL);
1136}