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/mce.h>
21 #include <asm/mmu.h>
22 #include <asm/oprofile_impl.h>
23 #include <asm/prom.h>
24 #include <asm/setup.h>
25
26
27 /* Device-tree visible constants follow */
28 #define ISA_V3_0B 3000
29 #define ISA_V3_1 3100
30
31 #define USABLE_PR (1U << 0)
32 #define USABLE_OS (1U << 1)
33 #define USABLE_HV (1U << 2)
34
35 #define HV_SUPPORT_HFSCR (1U << 0)
36 #define OS_SUPPORT_FSCR (1U << 0)
37
38 /* For parsing, we define all bits set as "NONE" case */
39 #define HV_SUPPORT_NONE 0xffffffffU
40 #define OS_SUPPORT_NONE 0xffffffffU
41
42 struct dt_cpu_feature {
43 const char *name;
44 uint32_t isa;
45 uint32_t usable_privilege;
46 uint32_t hv_support;
47 uint32_t os_support;
48 uint32_t hfscr_bit_nr;
49 uint32_t fscr_bit_nr;
50 uint32_t hwcap_bit_nr;
51 /* fdt parsing */
52 unsigned long node;
53 int enabled;
54 int disabled;
55 };
56
57 #define MMU_FTRS_HASH_BASE (MMU_FTRS_POWER8)
58
59 #define COMMON_USER_BASE (PPC_FEATURE_32 | PPC_FEATURE_64 | \
60 PPC_FEATURE_ARCH_2_06 |\
61 PPC_FEATURE_ICACHE_SNOOP)
62 #define COMMON_USER2_BASE (PPC_FEATURE2_ARCH_2_07 | \
63 PPC_FEATURE2_ISEL)
64 /*
65 * Set up the base CPU
66 */
67
68 static int hv_mode;
69
70 static struct {
71 u64 lpcr;
72 u64 lpcr_clear;
73 u64 hfscr;
74 u64 fscr;
75 u64 pcr;
76 } system_registers;
77
78 static void (*init_pmu_registers)(void);
79
__restore_cpu_cpufeatures(void)80 static void __restore_cpu_cpufeatures(void)
81 {
82 u64 lpcr;
83
84 /*
85 * LPCR is restored by the power on engine already. It can be changed
86 * after early init e.g., by radix enable, and we have no unified API
87 * for saving and restoring such SPRs.
88 *
89 * This ->restore hook should really be removed from idle and register
90 * restore moved directly into the idle restore code, because this code
91 * doesn't know how idle is implemented or what it needs restored here.
92 *
93 * The best we can do to accommodate secondary boot and idle restore
94 * for now is "or" LPCR with existing.
95 */
96 lpcr = mfspr(SPRN_LPCR);
97 lpcr |= system_registers.lpcr;
98 lpcr &= ~system_registers.lpcr_clear;
99 mtspr(SPRN_LPCR, lpcr);
100 if (hv_mode) {
101 mtspr(SPRN_LPID, 0);
102 mtspr(SPRN_HFSCR, system_registers.hfscr);
103 mtspr(SPRN_PCR, system_registers.pcr);
104 }
105 mtspr(SPRN_FSCR, system_registers.fscr);
106
107 if (init_pmu_registers)
108 init_pmu_registers();
109 }
110
111 static char dt_cpu_name[64];
112
113 static struct cpu_spec __initdata base_cpu_spec = {
114 .cpu_name = NULL,
115 .cpu_features = CPU_FTRS_DT_CPU_BASE,
116 .cpu_user_features = COMMON_USER_BASE,
117 .cpu_user_features2 = COMMON_USER2_BASE,
118 .mmu_features = 0,
119 .icache_bsize = 32, /* minimum block size, fixed by */
120 .dcache_bsize = 32, /* cache info init. */
121 .num_pmcs = 0,
122 .pmc_type = PPC_PMC_DEFAULT,
123 .oprofile_cpu_type = NULL,
124 .oprofile_type = PPC_OPROFILE_INVALID,
125 .cpu_setup = NULL,
126 .cpu_restore = __restore_cpu_cpufeatures,
127 .machine_check_early = NULL,
128 .platform = NULL,
129 };
130
cpufeatures_setup_cpu(void)131 static void __init cpufeatures_setup_cpu(void)
132 {
133 set_cur_cpu_spec(&base_cpu_spec);
134
135 cur_cpu_spec->pvr_mask = -1;
136 cur_cpu_spec->pvr_value = mfspr(SPRN_PVR);
137
138 /* Initialize the base environment -- clear FSCR/HFSCR. */
139 hv_mode = !!(mfmsr() & MSR_HV);
140 if (hv_mode) {
141 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
142 mtspr(SPRN_HFSCR, 0);
143 }
144 mtspr(SPRN_FSCR, 0);
145 mtspr(SPRN_PCR, PCR_MASK);
146
147 /*
148 * LPCR does not get cleared, to match behaviour with secondaries
149 * in __restore_cpu_cpufeatures. Once the idle code is fixed, this
150 * could clear LPCR too.
151 */
152 }
153
feat_try_enable_unknown(struct dt_cpu_feature * f)154 static int __init feat_try_enable_unknown(struct dt_cpu_feature *f)
155 {
156 if (f->hv_support == HV_SUPPORT_NONE) {
157 } else if (f->hv_support & HV_SUPPORT_HFSCR) {
158 u64 hfscr = mfspr(SPRN_HFSCR);
159 hfscr |= 1UL << f->hfscr_bit_nr;
160 mtspr(SPRN_HFSCR, hfscr);
161 } else {
162 /* Does not have a known recipe */
163 return 0;
164 }
165
166 if (f->os_support == OS_SUPPORT_NONE) {
167 } else if (f->os_support & OS_SUPPORT_FSCR) {
168 u64 fscr = mfspr(SPRN_FSCR);
169 fscr |= 1UL << f->fscr_bit_nr;
170 mtspr(SPRN_FSCR, fscr);
171 } else {
172 /* Does not have a known recipe */
173 return 0;
174 }
175
176 if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
177 uint32_t word = f->hwcap_bit_nr / 32;
178 uint32_t bit = f->hwcap_bit_nr % 32;
179
180 if (word == 0)
181 cur_cpu_spec->cpu_user_features |= 1U << bit;
182 else if (word == 1)
183 cur_cpu_spec->cpu_user_features2 |= 1U << bit;
184 else
185 pr_err("%s could not advertise to user (no hwcap bits)\n", f->name);
186 }
187
188 return 1;
189 }
190
feat_enable(struct dt_cpu_feature * f)191 static int __init feat_enable(struct dt_cpu_feature *f)
192 {
193 if (f->hv_support != HV_SUPPORT_NONE) {
194 if (f->hfscr_bit_nr != -1) {
195 u64 hfscr = mfspr(SPRN_HFSCR);
196 hfscr |= 1UL << f->hfscr_bit_nr;
197 mtspr(SPRN_HFSCR, hfscr);
198 }
199 }
200
201 if (f->os_support != OS_SUPPORT_NONE) {
202 if (f->fscr_bit_nr != -1) {
203 u64 fscr = mfspr(SPRN_FSCR);
204 fscr |= 1UL << f->fscr_bit_nr;
205 mtspr(SPRN_FSCR, fscr);
206 }
207 }
208
209 if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
210 uint32_t word = f->hwcap_bit_nr / 32;
211 uint32_t bit = f->hwcap_bit_nr % 32;
212
213 if (word == 0)
214 cur_cpu_spec->cpu_user_features |= 1U << bit;
215 else if (word == 1)
216 cur_cpu_spec->cpu_user_features2 |= 1U << bit;
217 else
218 pr_err("CPU feature: %s could not advertise to user (no hwcap bits)\n", f->name);
219 }
220
221 return 1;
222 }
223
feat_disable(struct dt_cpu_feature * f)224 static int __init feat_disable(struct dt_cpu_feature *f)
225 {
226 return 0;
227 }
228
feat_enable_hv(struct dt_cpu_feature * f)229 static int __init feat_enable_hv(struct dt_cpu_feature *f)
230 {
231 u64 lpcr;
232
233 if (!hv_mode) {
234 pr_err("CPU feature hypervisor present in device tree but HV mode not enabled in the CPU. Ignoring.\n");
235 return 0;
236 }
237
238 mtspr(SPRN_LPID, 0);
239
240 lpcr = mfspr(SPRN_LPCR);
241 lpcr &= ~LPCR_LPES0; /* HV external interrupts */
242 mtspr(SPRN_LPCR, lpcr);
243
244 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
245
246 return 1;
247 }
248
feat_enable_le(struct dt_cpu_feature * f)249 static int __init feat_enable_le(struct dt_cpu_feature *f)
250 {
251 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_TRUE_LE;
252 return 1;
253 }
254
feat_enable_smt(struct dt_cpu_feature * f)255 static int __init feat_enable_smt(struct dt_cpu_feature *f)
256 {
257 cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
258 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_SMT;
259 return 1;
260 }
261
feat_enable_idle_nap(struct dt_cpu_feature * f)262 static int __init feat_enable_idle_nap(struct dt_cpu_feature *f)
263 {
264 u64 lpcr;
265
266 /* Set PECE wakeup modes for ISA 207 */
267 lpcr = mfspr(SPRN_LPCR);
268 lpcr |= LPCR_PECE0;
269 lpcr |= LPCR_PECE1;
270 lpcr |= LPCR_PECE2;
271 mtspr(SPRN_LPCR, lpcr);
272
273 return 1;
274 }
275
feat_enable_align_dsisr(struct dt_cpu_feature * f)276 static int __init feat_enable_align_dsisr(struct dt_cpu_feature *f)
277 {
278 cur_cpu_spec->cpu_features &= ~CPU_FTR_NODSISRALIGN;
279
280 return 1;
281 }
282
feat_enable_idle_stop(struct dt_cpu_feature * f)283 static int __init feat_enable_idle_stop(struct dt_cpu_feature *f)
284 {
285 u64 lpcr;
286
287 /* Set PECE wakeup modes for ISAv3.0B */
288 lpcr = mfspr(SPRN_LPCR);
289 lpcr |= LPCR_PECE0;
290 lpcr |= LPCR_PECE1;
291 lpcr |= LPCR_PECE2;
292 mtspr(SPRN_LPCR, lpcr);
293
294 return 1;
295 }
296
feat_enable_mmu_hash(struct dt_cpu_feature * f)297 static int __init feat_enable_mmu_hash(struct dt_cpu_feature *f)
298 {
299 u64 lpcr;
300
301 lpcr = mfspr(SPRN_LPCR);
302 lpcr &= ~LPCR_ISL;
303
304 /* VRMASD */
305 lpcr |= LPCR_VPM0;
306 lpcr &= ~LPCR_VPM1;
307 lpcr |= 0x10UL << LPCR_VRMASD_SH; /* L=1 LP=00 */
308 mtspr(SPRN_LPCR, lpcr);
309
310 cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
311 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
312
313 return 1;
314 }
315
feat_enable_mmu_hash_v3(struct dt_cpu_feature * f)316 static int __init feat_enable_mmu_hash_v3(struct dt_cpu_feature *f)
317 {
318 u64 lpcr;
319
320 system_registers.lpcr_clear |= (LPCR_ISL | LPCR_UPRT | LPCR_HR);
321 lpcr = mfspr(SPRN_LPCR);
322 lpcr &= ~(LPCR_ISL | LPCR_UPRT | LPCR_HR);
323 mtspr(SPRN_LPCR, lpcr);
324
325 cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
326 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
327
328 return 1;
329 }
330
331
feat_enable_mmu_radix(struct dt_cpu_feature * f)332 static int __init feat_enable_mmu_radix(struct dt_cpu_feature *f)
333 {
334 #ifdef CONFIG_PPC_RADIX_MMU
335 cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX;
336 cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
337 cur_cpu_spec->mmu_features |= MMU_FTR_GTSE;
338 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
339
340 return 1;
341 #endif
342 return 0;
343 }
344
feat_enable_dscr(struct dt_cpu_feature * f)345 static int __init feat_enable_dscr(struct dt_cpu_feature *f)
346 {
347 u64 lpcr;
348
349 /*
350 * Linux relies on FSCR[DSCR] being clear, so that we can take the
351 * facility unavailable interrupt and track the task's usage of DSCR.
352 * See facility_unavailable_exception().
353 * Clear the bit here so that feat_enable() doesn't set it.
354 */
355 f->fscr_bit_nr = -1;
356
357 feat_enable(f);
358
359 lpcr = mfspr(SPRN_LPCR);
360 lpcr &= ~LPCR_DPFD;
361 lpcr |= (4UL << LPCR_DPFD_SH);
362 mtspr(SPRN_LPCR, lpcr);
363
364 return 1;
365 }
366
hfscr_pmu_enable(void)367 static void hfscr_pmu_enable(void)
368 {
369 u64 hfscr = mfspr(SPRN_HFSCR);
370 hfscr |= PPC_BIT(60);
371 mtspr(SPRN_HFSCR, hfscr);
372 }
373
init_pmu_power8(void)374 static void init_pmu_power8(void)
375 {
376 if (hv_mode) {
377 mtspr(SPRN_MMCRC, 0);
378 mtspr(SPRN_MMCRH, 0);
379 }
380
381 mtspr(SPRN_MMCRA, 0);
382 mtspr(SPRN_MMCR0, 0);
383 mtspr(SPRN_MMCR1, 0);
384 mtspr(SPRN_MMCR2, 0);
385 mtspr(SPRN_MMCRS, 0);
386 }
387
feat_enable_mce_power8(struct dt_cpu_feature * f)388 static int __init feat_enable_mce_power8(struct dt_cpu_feature *f)
389 {
390 cur_cpu_spec->platform = "power8";
391 cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p8;
392
393 return 1;
394 }
395
feat_enable_pmu_power8(struct dt_cpu_feature * f)396 static int __init feat_enable_pmu_power8(struct dt_cpu_feature *f)
397 {
398 hfscr_pmu_enable();
399
400 init_pmu_power8();
401 init_pmu_registers = init_pmu_power8;
402
403 cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
404 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
405 if (pvr_version_is(PVR_POWER8E))
406 cur_cpu_spec->cpu_features |= CPU_FTR_PMAO_BUG;
407
408 cur_cpu_spec->num_pmcs = 6;
409 cur_cpu_spec->pmc_type = PPC_PMC_IBM;
410 cur_cpu_spec->oprofile_cpu_type = "ppc64/power8";
411
412 return 1;
413 }
414
init_pmu_power9(void)415 static void init_pmu_power9(void)
416 {
417 if (hv_mode)
418 mtspr(SPRN_MMCRC, 0);
419
420 mtspr(SPRN_MMCRA, 0);
421 mtspr(SPRN_MMCR0, 0);
422 mtspr(SPRN_MMCR1, 0);
423 mtspr(SPRN_MMCR2, 0);
424 }
425
feat_enable_mce_power9(struct dt_cpu_feature * f)426 static int __init feat_enable_mce_power9(struct dt_cpu_feature *f)
427 {
428 cur_cpu_spec->platform = "power9";
429 cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p9;
430
431 return 1;
432 }
433
feat_enable_pmu_power9(struct dt_cpu_feature * f)434 static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f)
435 {
436 hfscr_pmu_enable();
437
438 init_pmu_power9();
439 init_pmu_registers = init_pmu_power9;
440
441 cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
442 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
443
444 cur_cpu_spec->num_pmcs = 6;
445 cur_cpu_spec->pmc_type = PPC_PMC_IBM;
446 cur_cpu_spec->oprofile_cpu_type = "ppc64/power9";
447
448 return 1;
449 }
450
init_pmu_power10(void)451 static void init_pmu_power10(void)
452 {
453 init_pmu_power9();
454
455 mtspr(SPRN_MMCR3, 0);
456 mtspr(SPRN_MMCRA, MMCRA_BHRB_DISABLE);
457 }
458
feat_enable_pmu_power10(struct dt_cpu_feature * f)459 static int __init feat_enable_pmu_power10(struct dt_cpu_feature *f)
460 {
461 hfscr_pmu_enable();
462
463 init_pmu_power10();
464 init_pmu_registers = init_pmu_power10;
465
466 cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
467 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
468
469 cur_cpu_spec->num_pmcs = 6;
470 cur_cpu_spec->pmc_type = PPC_PMC_IBM;
471 cur_cpu_spec->oprofile_cpu_type = "ppc64/power10";
472
473 return 1;
474 }
475
feat_enable_mce_power10(struct dt_cpu_feature * f)476 static int __init feat_enable_mce_power10(struct dt_cpu_feature *f)
477 {
478 cur_cpu_spec->platform = "power10";
479 cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p10;
480
481 return 1;
482 }
483
feat_enable_tm(struct dt_cpu_feature * f)484 static int __init feat_enable_tm(struct dt_cpu_feature *f)
485 {
486 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
487 feat_enable(f);
488 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NOSC;
489 return 1;
490 #endif
491 return 0;
492 }
493
feat_enable_fp(struct dt_cpu_feature * f)494 static int __init feat_enable_fp(struct dt_cpu_feature *f)
495 {
496 feat_enable(f);
497 cur_cpu_spec->cpu_features &= ~CPU_FTR_FPU_UNAVAILABLE;
498
499 return 1;
500 }
501
feat_enable_vector(struct dt_cpu_feature * f)502 static int __init feat_enable_vector(struct dt_cpu_feature *f)
503 {
504 #ifdef CONFIG_ALTIVEC
505 feat_enable(f);
506 cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
507 cur_cpu_spec->cpu_features |= CPU_FTR_VMX_COPY;
508 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
509
510 return 1;
511 #endif
512 return 0;
513 }
514
feat_enable_vsx(struct dt_cpu_feature * f)515 static int __init feat_enable_vsx(struct dt_cpu_feature *f)
516 {
517 #ifdef CONFIG_VSX
518 feat_enable(f);
519 cur_cpu_spec->cpu_features |= CPU_FTR_VSX;
520 cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_VSX;
521
522 return 1;
523 #endif
524 return 0;
525 }
526
feat_enable_purr(struct dt_cpu_feature * f)527 static int __init feat_enable_purr(struct dt_cpu_feature *f)
528 {
529 cur_cpu_spec->cpu_features |= CPU_FTR_PURR | CPU_FTR_SPURR;
530
531 return 1;
532 }
533
feat_enable_ebb(struct dt_cpu_feature * f)534 static int __init feat_enable_ebb(struct dt_cpu_feature *f)
535 {
536 /*
537 * PPC_FEATURE2_EBB is enabled in PMU init code because it has
538 * historically been related to the PMU facility. This may have
539 * to be decoupled if EBB becomes more generic. For now, follow
540 * existing convention.
541 */
542 f->hwcap_bit_nr = -1;
543 feat_enable(f);
544
545 return 1;
546 }
547
feat_enable_dbell(struct dt_cpu_feature * f)548 static int __init feat_enable_dbell(struct dt_cpu_feature *f)
549 {
550 u64 lpcr;
551
552 /* P9 has an HFSCR for privileged state */
553 feat_enable(f);
554
555 cur_cpu_spec->cpu_features |= CPU_FTR_DBELL;
556
557 lpcr = mfspr(SPRN_LPCR);
558 lpcr |= LPCR_PECEDH; /* hyp doorbell wakeup */
559 mtspr(SPRN_LPCR, lpcr);
560
561 return 1;
562 }
563
feat_enable_hvi(struct dt_cpu_feature * f)564 static int __init feat_enable_hvi(struct dt_cpu_feature *f)
565 {
566 u64 lpcr;
567
568 /*
569 * POWER9 XIVE interrupts including in OPAL XICS compatibility
570 * are always delivered as hypervisor virtualization interrupts (HVI)
571 * rather than EE.
572 *
573 * However LPES0 is not set here, in the chance that an EE does get
574 * delivered to the host somehow, the EE handler would not expect it
575 * to be delivered in LPES0 mode (e.g., using SRR[01]). This could
576 * happen if there is a bug in interrupt controller code, or IC is
577 * misconfigured in systemsim.
578 */
579
580 lpcr = mfspr(SPRN_LPCR);
581 lpcr |= LPCR_HVICE; /* enable hvi interrupts */
582 lpcr |= LPCR_HEIC; /* disable ee interrupts when MSR_HV */
583 lpcr |= LPCR_PECE_HVEE; /* hvi can wake from stop */
584 mtspr(SPRN_LPCR, lpcr);
585
586 return 1;
587 }
588
feat_enable_large_ci(struct dt_cpu_feature * f)589 static int __init feat_enable_large_ci(struct dt_cpu_feature *f)
590 {
591 cur_cpu_spec->mmu_features |= MMU_FTR_CI_LARGE_PAGE;
592
593 return 1;
594 }
595
feat_enable_mma(struct dt_cpu_feature * f)596 static int __init feat_enable_mma(struct dt_cpu_feature *f)
597 {
598 u64 pcr;
599
600 feat_enable(f);
601 pcr = mfspr(SPRN_PCR);
602 pcr &= ~PCR_MMA_DIS;
603 mtspr(SPRN_PCR, pcr);
604
605 return 1;
606 }
607
608 struct dt_cpu_feature_match {
609 const char *name;
610 int (*enable)(struct dt_cpu_feature *f);
611 u64 cpu_ftr_bit_mask;
612 };
613
614 static struct dt_cpu_feature_match __initdata
615 dt_cpu_feature_match_table[] = {
616 {"hypervisor", feat_enable_hv, 0},
617 {"big-endian", feat_enable, 0},
618 {"little-endian", feat_enable_le, CPU_FTR_REAL_LE},
619 {"smt", feat_enable_smt, 0},
620 {"interrupt-facilities", feat_enable, 0},
621 {"system-call-vectored", feat_enable, 0},
622 {"timer-facilities", feat_enable, 0},
623 {"timer-facilities-v3", feat_enable, 0},
624 {"debug-facilities", feat_enable, 0},
625 {"come-from-address-register", feat_enable, CPU_FTR_CFAR},
626 {"branch-tracing", feat_enable, 0},
627 {"floating-point", feat_enable_fp, 0},
628 {"vector", feat_enable_vector, 0},
629 {"vector-scalar", feat_enable_vsx, 0},
630 {"vector-scalar-v3", feat_enable, 0},
631 {"decimal-floating-point", feat_enable, 0},
632 {"decimal-integer", feat_enable, 0},
633 {"quadword-load-store", feat_enable, 0},
634 {"vector-crypto", feat_enable, 0},
635 {"mmu-hash", feat_enable_mmu_hash, 0},
636 {"mmu-radix", feat_enable_mmu_radix, 0},
637 {"mmu-hash-v3", feat_enable_mmu_hash_v3, 0},
638 {"virtual-page-class-key-protection", feat_enable, 0},
639 {"transactional-memory", feat_enable_tm, CPU_FTR_TM},
640 {"transactional-memory-v3", feat_enable_tm, 0},
641 {"tm-suspend-hypervisor-assist", feat_enable, CPU_FTR_P9_TM_HV_ASSIST},
642 {"tm-suspend-xer-so-bug", feat_enable, CPU_FTR_P9_TM_XER_SO_BUG},
643 {"idle-nap", feat_enable_idle_nap, 0},
644 {"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0},
645 {"idle-stop", feat_enable_idle_stop, 0},
646 {"machine-check-power8", feat_enable_mce_power8, 0},
647 {"performance-monitor-power8", feat_enable_pmu_power8, 0},
648 {"data-stream-control-register", feat_enable_dscr, CPU_FTR_DSCR},
649 {"event-based-branch", feat_enable_ebb, 0},
650 {"target-address-register", feat_enable, 0},
651 {"branch-history-rolling-buffer", feat_enable, 0},
652 {"control-register", feat_enable, CPU_FTR_CTRL},
653 {"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL},
654 {"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL},
655 {"processor-utilization-of-resources-register", feat_enable_purr, 0},
656 {"no-execute", feat_enable, 0},
657 {"strong-access-ordering", feat_enable, CPU_FTR_SAO},
658 {"cache-inhibited-large-page", feat_enable_large_ci, 0},
659 {"coprocessor-icswx", feat_enable, 0},
660 {"hypervisor-virtualization-interrupt", feat_enable_hvi, 0},
661 {"program-priority-register", feat_enable, CPU_FTR_HAS_PPR},
662 {"wait", feat_enable, 0},
663 {"atomic-memory-operations", feat_enable, 0},
664 {"branch-v3", feat_enable, 0},
665 {"copy-paste", feat_enable, 0},
666 {"decimal-floating-point-v3", feat_enable, 0},
667 {"decimal-integer-v3", feat_enable, 0},
668 {"fixed-point-v3", feat_enable, 0},
669 {"floating-point-v3", feat_enable, 0},
670 {"group-start-register", feat_enable, 0},
671 {"pc-relative-addressing", feat_enable, 0},
672 {"machine-check-power9", feat_enable_mce_power9, 0},
673 {"machine-check-power10", feat_enable_mce_power10, 0},
674 {"performance-monitor-power9", feat_enable_pmu_power9, 0},
675 {"performance-monitor-power10", feat_enable_pmu_power10, 0},
676 {"event-based-branch-v3", feat_enable, 0},
677 {"random-number-generator", feat_enable, 0},
678 {"system-call-vectored", feat_disable, 0},
679 {"trace-interrupt-v3", feat_enable, 0},
680 {"vector-v3", feat_enable, 0},
681 {"vector-binary128", feat_enable, 0},
682 {"vector-binary16", feat_enable, 0},
683 {"wait-v3", feat_enable, 0},
684 {"prefix-instructions", feat_enable, 0},
685 {"matrix-multiply-assist", feat_enable_mma, 0},
686 {"debug-facilities-v31", feat_enable, CPU_FTR_DAWR1},
687 };
688
689 static bool __initdata using_dt_cpu_ftrs;
690 static bool __initdata enable_unknown = true;
691
dt_cpu_ftrs_parse(char * str)692 static int __init dt_cpu_ftrs_parse(char *str)
693 {
694 if (!str)
695 return 0;
696
697 if (!strcmp(str, "off"))
698 using_dt_cpu_ftrs = false;
699 else if (!strcmp(str, "known"))
700 enable_unknown = false;
701 else
702 return 1;
703
704 return 0;
705 }
706 early_param("dt_cpu_ftrs", dt_cpu_ftrs_parse);
707
cpufeatures_setup_start(u32 isa)708 static void __init cpufeatures_setup_start(u32 isa)
709 {
710 pr_info("setup for ISA %d\n", isa);
711
712 if (isa >= ISA_V3_0B) {
713 cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300;
714 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00;
715 }
716
717 if (isa >= ISA_V3_1) {
718 cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_31;
719 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_1;
720 }
721 }
722
cpufeatures_process_feature(struct dt_cpu_feature * f)723 static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f)
724 {
725 const struct dt_cpu_feature_match *m;
726 bool known = false;
727 int i;
728
729 for (i = 0; i < ARRAY_SIZE(dt_cpu_feature_match_table); i++) {
730 m = &dt_cpu_feature_match_table[i];
731 if (!strcmp(f->name, m->name)) {
732 known = true;
733 if (m->enable(f)) {
734 cur_cpu_spec->cpu_features |= m->cpu_ftr_bit_mask;
735 break;
736 }
737
738 pr_info("not enabling: %s (disabled or unsupported by kernel)\n",
739 f->name);
740 return false;
741 }
742 }
743
744 if (!known && (!enable_unknown || !feat_try_enable_unknown(f))) {
745 pr_info("not enabling: %s (unknown and unsupported by kernel)\n",
746 f->name);
747 return false;
748 }
749
750 if (known)
751 pr_debug("enabling: %s\n", f->name);
752 else
753 pr_debug("enabling: %s (unknown)\n", f->name);
754
755 return true;
756 }
757
758 /*
759 * Handle POWER9 broadcast tlbie invalidation issue using
760 * cpu feature flag.
761 */
update_tlbie_feature_flag(unsigned long pvr)762 static __init void update_tlbie_feature_flag(unsigned long pvr)
763 {
764 if (PVR_VER(pvr) == PVR_POWER9) {
765 /*
766 * Set the tlbie feature flag for anything below
767 * Nimbus DD 2.3 and Cumulus DD 1.3
768 */
769 if ((pvr & 0xe000) == 0) {
770 /* Nimbus */
771 if ((pvr & 0xfff) < 0x203)
772 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
773 } else if ((pvr & 0xc000) == 0) {
774 /* Cumulus */
775 if ((pvr & 0xfff) < 0x103)
776 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
777 } else {
778 WARN_ONCE(1, "Unknown PVR");
779 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_STQ_BUG;
780 }
781
782 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TLBIE_ERAT_BUG;
783 }
784 }
785
cpufeatures_cpu_quirks(void)786 static __init void cpufeatures_cpu_quirks(void)
787 {
788 unsigned long version = mfspr(SPRN_PVR);
789
790 /*
791 * Not all quirks can be derived from the cpufeatures device tree.
792 */
793 if ((version & 0xffffefff) == 0x004e0200) {
794 /* DD2.0 has no feature flag */
795 cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
796 } else if ((version & 0xffffefff) == 0x004e0201) {
797 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
798 cur_cpu_spec->cpu_features |= CPU_FTR_P9_RADIX_PREFETCH_BUG;
799 } else if ((version & 0xffffefff) == 0x004e0202) {
800 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST;
801 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG;
802 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
803 } else if ((version & 0xffff0000) == 0x004e0000) {
804 /* DD2.1 and up have DD2_1 */
805 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
806 }
807
808 if ((version & 0xffff0000) == 0x004e0000) {
809 cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR);
810 cur_cpu_spec->cpu_features |= CPU_FTR_P9_TIDR;
811 }
812
813 update_tlbie_feature_flag(version);
814 }
815
cpufeatures_setup_finished(void)816 static void __init cpufeatures_setup_finished(void)
817 {
818 cpufeatures_cpu_quirks();
819
820 if (hv_mode && !(cur_cpu_spec->cpu_features & CPU_FTR_HVMODE)) {
821 pr_err("hypervisor not present in device tree but HV mode is enabled in the CPU. Enabling.\n");
822 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
823 }
824
825 /* Make sure powerpc_base_platform is non-NULL */
826 powerpc_base_platform = cur_cpu_spec->platform;
827
828 system_registers.lpcr = mfspr(SPRN_LPCR);
829 system_registers.hfscr = mfspr(SPRN_HFSCR);
830 system_registers.fscr = mfspr(SPRN_FSCR);
831 system_registers.pcr = mfspr(SPRN_PCR);
832
833 pr_info("final cpu/mmu features = 0x%016lx 0x%08x\n",
834 cur_cpu_spec->cpu_features, cur_cpu_spec->mmu_features);
835 }
836
disabled_on_cmdline(void)837 static int __init disabled_on_cmdline(void)
838 {
839 unsigned long root, chosen;
840 const char *p;
841
842 root = of_get_flat_dt_root();
843 chosen = of_get_flat_dt_subnode_by_name(root, "chosen");
844 if (chosen == -FDT_ERR_NOTFOUND)
845 return false;
846
847 p = of_get_flat_dt_prop(chosen, "bootargs", NULL);
848 if (!p)
849 return false;
850
851 if (strstr(p, "dt_cpu_ftrs=off"))
852 return true;
853
854 return false;
855 }
856
fdt_find_cpu_features(unsigned long node,const char * uname,int depth,void * data)857 static int __init fdt_find_cpu_features(unsigned long node, const char *uname,
858 int depth, void *data)
859 {
860 if (of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features")
861 && of_get_flat_dt_prop(node, "isa", NULL))
862 return 1;
863
864 return 0;
865 }
866
dt_cpu_ftrs_in_use(void)867 bool __init dt_cpu_ftrs_in_use(void)
868 {
869 return using_dt_cpu_ftrs;
870 }
871
dt_cpu_ftrs_init(void * fdt)872 bool __init dt_cpu_ftrs_init(void *fdt)
873 {
874 using_dt_cpu_ftrs = false;
875
876 /* Setup and verify the FDT, if it fails we just bail */
877 if (!early_init_dt_verify(fdt))
878 return false;
879
880 if (!of_scan_flat_dt(fdt_find_cpu_features, NULL))
881 return false;
882
883 if (disabled_on_cmdline())
884 return false;
885
886 cpufeatures_setup_cpu();
887
888 using_dt_cpu_ftrs = true;
889 return true;
890 }
891
892 static int nr_dt_cpu_features;
893 static struct dt_cpu_feature *dt_cpu_features;
894
process_cpufeatures_node(unsigned long node,const char * uname,int i)895 static int __init process_cpufeatures_node(unsigned long node,
896 const char *uname, int i)
897 {
898 const __be32 *prop;
899 struct dt_cpu_feature *f;
900 int len;
901
902 f = &dt_cpu_features[i];
903
904 f->node = node;
905
906 f->name = uname;
907
908 prop = of_get_flat_dt_prop(node, "isa", &len);
909 if (!prop) {
910 pr_warn("%s: missing isa property\n", uname);
911 return 0;
912 }
913 f->isa = be32_to_cpup(prop);
914
915 prop = of_get_flat_dt_prop(node, "usable-privilege", &len);
916 if (!prop) {
917 pr_warn("%s: missing usable-privilege property", uname);
918 return 0;
919 }
920 f->usable_privilege = be32_to_cpup(prop);
921
922 prop = of_get_flat_dt_prop(node, "hv-support", &len);
923 if (prop)
924 f->hv_support = be32_to_cpup(prop);
925 else
926 f->hv_support = HV_SUPPORT_NONE;
927
928 prop = of_get_flat_dt_prop(node, "os-support", &len);
929 if (prop)
930 f->os_support = be32_to_cpup(prop);
931 else
932 f->os_support = OS_SUPPORT_NONE;
933
934 prop = of_get_flat_dt_prop(node, "hfscr-bit-nr", &len);
935 if (prop)
936 f->hfscr_bit_nr = be32_to_cpup(prop);
937 else
938 f->hfscr_bit_nr = -1;
939 prop = of_get_flat_dt_prop(node, "fscr-bit-nr", &len);
940 if (prop)
941 f->fscr_bit_nr = be32_to_cpup(prop);
942 else
943 f->fscr_bit_nr = -1;
944 prop = of_get_flat_dt_prop(node, "hwcap-bit-nr", &len);
945 if (prop)
946 f->hwcap_bit_nr = be32_to_cpup(prop);
947 else
948 f->hwcap_bit_nr = -1;
949
950 if (f->usable_privilege & USABLE_HV) {
951 if (!(mfmsr() & MSR_HV)) {
952 pr_warn("%s: HV feature passed to guest\n", uname);
953 return 0;
954 }
955
956 if (f->hv_support == HV_SUPPORT_NONE && f->hfscr_bit_nr != -1) {
957 pr_warn("%s: unwanted hfscr_bit_nr\n", uname);
958 return 0;
959 }
960
961 if (f->hv_support == HV_SUPPORT_HFSCR) {
962 if (f->hfscr_bit_nr == -1) {
963 pr_warn("%s: missing hfscr_bit_nr\n", uname);
964 return 0;
965 }
966 }
967 } else {
968 if (f->hv_support != HV_SUPPORT_NONE || f->hfscr_bit_nr != -1) {
969 pr_warn("%s: unwanted hv_support/hfscr_bit_nr\n", uname);
970 return 0;
971 }
972 }
973
974 if (f->usable_privilege & USABLE_OS) {
975 if (f->os_support == OS_SUPPORT_NONE && f->fscr_bit_nr != -1) {
976 pr_warn("%s: unwanted fscr_bit_nr\n", uname);
977 return 0;
978 }
979
980 if (f->os_support == OS_SUPPORT_FSCR) {
981 if (f->fscr_bit_nr == -1) {
982 pr_warn("%s: missing fscr_bit_nr\n", uname);
983 return 0;
984 }
985 }
986 } else {
987 if (f->os_support != OS_SUPPORT_NONE || f->fscr_bit_nr != -1) {
988 pr_warn("%s: unwanted os_support/fscr_bit_nr\n", uname);
989 return 0;
990 }
991 }
992
993 if (!(f->usable_privilege & USABLE_PR)) {
994 if (f->hwcap_bit_nr != -1) {
995 pr_warn("%s: unwanted hwcap_bit_nr\n", uname);
996 return 0;
997 }
998 }
999
1000 /* Do all the independent features in the first pass */
1001 if (!of_get_flat_dt_prop(node, "dependencies", &len)) {
1002 if (cpufeatures_process_feature(f))
1003 f->enabled = 1;
1004 else
1005 f->disabled = 1;
1006 }
1007
1008 return 0;
1009 }
1010
cpufeatures_deps_enable(struct dt_cpu_feature * f)1011 static void __init cpufeatures_deps_enable(struct dt_cpu_feature *f)
1012 {
1013 const __be32 *prop;
1014 int len;
1015 int nr_deps;
1016 int i;
1017
1018 if (f->enabled || f->disabled)
1019 return;
1020
1021 prop = of_get_flat_dt_prop(f->node, "dependencies", &len);
1022 if (!prop) {
1023 pr_warn("%s: missing dependencies property", f->name);
1024 return;
1025 }
1026
1027 nr_deps = len / sizeof(int);
1028
1029 for (i = 0; i < nr_deps; i++) {
1030 unsigned long phandle = be32_to_cpu(prop[i]);
1031 int j;
1032
1033 for (j = 0; j < nr_dt_cpu_features; j++) {
1034 struct dt_cpu_feature *d = &dt_cpu_features[j];
1035
1036 if (of_get_flat_dt_phandle(d->node) == phandle) {
1037 cpufeatures_deps_enable(d);
1038 if (d->disabled) {
1039 f->disabled = 1;
1040 return;
1041 }
1042 }
1043 }
1044 }
1045
1046 if (cpufeatures_process_feature(f))
1047 f->enabled = 1;
1048 else
1049 f->disabled = 1;
1050 }
1051
scan_cpufeatures_subnodes(unsigned long node,const char * uname,void * data)1052 static int __init scan_cpufeatures_subnodes(unsigned long node,
1053 const char *uname,
1054 void *data)
1055 {
1056 int *count = data;
1057
1058 process_cpufeatures_node(node, uname, *count);
1059
1060 (*count)++;
1061
1062 return 0;
1063 }
1064
count_cpufeatures_subnodes(unsigned long node,const char * uname,void * data)1065 static int __init count_cpufeatures_subnodes(unsigned long node,
1066 const char *uname,
1067 void *data)
1068 {
1069 int *count = data;
1070
1071 (*count)++;
1072
1073 return 0;
1074 }
1075
dt_cpu_ftrs_scan_callback(unsigned long node,const char * uname,int depth,void * data)1076 static int __init dt_cpu_ftrs_scan_callback(unsigned long node, const char
1077 *uname, int depth, void *data)
1078 {
1079 const __be32 *prop;
1080 int count, i;
1081 u32 isa;
1082
1083 /* We are scanning "ibm,powerpc-cpu-features" nodes only */
1084 if (!of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features"))
1085 return 0;
1086
1087 prop = of_get_flat_dt_prop(node, "isa", NULL);
1088 if (!prop)
1089 /* We checked before, "can't happen" */
1090 return 0;
1091
1092 isa = be32_to_cpup(prop);
1093
1094 /* Count and allocate space for cpu features */
1095 of_scan_flat_dt_subnodes(node, count_cpufeatures_subnodes,
1096 &nr_dt_cpu_features);
1097 dt_cpu_features = memblock_alloc(sizeof(struct dt_cpu_feature) * nr_dt_cpu_features, PAGE_SIZE);
1098 if (!dt_cpu_features)
1099 panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
1100 __func__,
1101 sizeof(struct dt_cpu_feature) * nr_dt_cpu_features,
1102 PAGE_SIZE);
1103
1104 cpufeatures_setup_start(isa);
1105
1106 /* Scan nodes into dt_cpu_features and enable those without deps */
1107 count = 0;
1108 of_scan_flat_dt_subnodes(node, scan_cpufeatures_subnodes, &count);
1109
1110 /* Recursive enable remaining features with dependencies */
1111 for (i = 0; i < nr_dt_cpu_features; i++) {
1112 struct dt_cpu_feature *f = &dt_cpu_features[i];
1113
1114 cpufeatures_deps_enable(f);
1115 }
1116
1117 prop = of_get_flat_dt_prop(node, "display-name", NULL);
1118 if (prop && strlen((char *)prop) != 0) {
1119 strlcpy(dt_cpu_name, (char *)prop, sizeof(dt_cpu_name));
1120 cur_cpu_spec->cpu_name = dt_cpu_name;
1121 }
1122
1123 cpufeatures_setup_finished();
1124
1125 memblock_free(__pa(dt_cpu_features),
1126 sizeof(struct dt_cpu_feature)*nr_dt_cpu_features);
1127
1128 return 0;
1129 }
1130
dt_cpu_ftrs_scan(void)1131 void __init dt_cpu_ftrs_scan(void)
1132 {
1133 if (!using_dt_cpu_ftrs)
1134 return;
1135
1136 of_scan_flat_dt(dt_cpu_ftrs_scan_callback, NULL);
1137 }
1138