arch/powerpc/kernel/dt_cpu_ftrs.c

   1 /*
   2  * Copyright 2017, Nicholas Piggin, IBM Corporation
   3  * Licensed under GPLv2.
   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_V2_07B      2070
  28 #define ISA_V3_0B       3000
  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
  41 struct 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 CPU_FTRS_BASE \
  57            (CPU_FTR_USE_TB | \
  58             CPU_FTR_LWSYNC | \
  59             CPU_FTR_FPU_UNAVAILABLE |\
  60             CPU_FTR_NODSISRALIGN |\
  61             CPU_FTR_NOEXECUTE |\
  62             CPU_FTR_COHERENT_ICACHE | \
  63             CPU_FTR_STCX_CHECKS_ADDRESS |\
  64             CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
  65             CPU_FTR_DAWR | \
  66             CPU_FTR_ARCH_206 |\
  67             CPU_FTR_ARCH_207S)
  68
  69 #define MMU_FTRS_HASH_BASE (MMU_FTRS_POWER8)
  70
  71 #define COMMON_USER_BASE        (PPC_FEATURE_32 | PPC_FEATURE_64 | \
  72                                  PPC_FEATURE_ARCH_2_06 |\
  73                                  PPC_FEATURE_ICACHE_SNOOP)
  74 #define COMMON_USER2_BASE       (PPC_FEATURE2_ARCH_2_07 | \
  75                                  PPC_FEATURE2_ISEL)
  76 /*
  77  * Set up the base CPU
  78  */
  79
  80 extern void __flush_tlb_power8(unsigned int action);
  81 extern void __flush_tlb_power9(unsigned int action);
  82 extern long __machine_check_early_realmode_p8(struct pt_regs *regs);
  83 extern long __machine_check_early_realmode_p9(struct pt_regs *regs);
  84
  85 static int hv_mode;
  86
  87 static struct {
  88         u64     lpcr;
  89         u64     hfscr;
  90         u64     fscr;
  91 } system_registers;
  92
  93 static void (*init_pmu_registers)(void);
  94
  95 static void cpufeatures_flush_tlb(void)
  96 {
  97         unsigned long rb;
  98         unsigned int i, num_sets;
  99
 100         /*
 101          * This is a temporary measure to keep equivalent TLB flush as the
 102          * cputable based setup code.
 103          */
 104         switch (PVR_VER(mfspr(SPRN_PVR))) {
 105         case PVR_POWER8:
 106         case PVR_POWER8E:
 107         case PVR_POWER8NVL:
 108                 num_sets = POWER8_TLB_SETS;
 109                 break;
 110         case PVR_POWER9:
 111                 num_sets = POWER9_TLB_SETS_HASH;
 112                 break;
 113         default:
 114                 num_sets = 1;
 115                 pr_err("unknown CPU version for boot TLB flush\n");
 116                 break;
 117         }
 118
 119         asm volatile("ptesync" : : : "memory");
 120         rb = TLBIEL_INVAL_SET;
 121         for (i = 0; i < num_sets; i++) {
 122                 asm volatile("tlbiel %0" : : "r" (rb));
 123                 rb += 1 << TLBIEL_INVAL_SET_SHIFT;
 124         }
 125         asm volatile("ptesync" : : : "memory");
 126 }
 127
 128 static void __restore_cpu_cpufeatures(void)
 129 {
 130         /*
 131          * LPCR is restored by the power on engine already. It can be changed
 132          * after early init e.g., by radix enable, and we have no unified API
 133          * for saving and restoring such SPRs.
 134          *
 135          * This ->restore hook should really be removed from idle and register
 136          * restore moved directly into the idle restore code, because this code
 137          * doesn't know how idle is implemented or what it needs restored here.
 138          *
 139          * The best we can do to accommodate secondary boot and idle restore
 140          * for now is "or" LPCR with existing.
 141          */
 142
 143         mtspr(SPRN_LPCR, system_registers.lpcr | mfspr(SPRN_LPCR));
 144         if (hv_mode) {
 145                 mtspr(SPRN_LPID, 0);
 146                 mtspr(SPRN_HFSCR, system_registers.hfscr);
 147         }
 148         mtspr(SPRN_FSCR, system_registers.fscr);
 149
 150         if (init_pmu_registers)
 151                 init_pmu_registers();
 152
 153         cpufeatures_flush_tlb();
 154 }
 155
 156 static char dt_cpu_name[64];
 157
 158 static struct cpu_spec __initdata base_cpu_spec = {
 159         .cpu_name               = NULL,
 160         .cpu_features           = CPU_FTRS_BASE,
 161         .cpu_user_features      = COMMON_USER_BASE,
 162         .cpu_user_features2     = COMMON_USER2_BASE,
 163         .mmu_features           = 0,
 164         .icache_bsize           = 32, /* minimum block size, fixed by */
 165         .dcache_bsize           = 32, /* cache info init.             */
 166         .num_pmcs               = 0,
 167         .pmc_type               = PPC_PMC_DEFAULT,
 168         .oprofile_cpu_type      = NULL,
 169         .oprofile_type          = PPC_OPROFILE_INVALID,
 170         .cpu_setup              = NULL,
 171         .cpu_restore            = __restore_cpu_cpufeatures,
 172         .flush_tlb              = NULL,
 173         .machine_check_early    = NULL,
 174         .platform               = NULL,
 175 };
 176
 177 static void __init cpufeatures_setup_cpu(void)
 178 {
 179         set_cur_cpu_spec(&base_cpu_spec);
 180
 181         cur_cpu_spec->pvr_mask = -1;
 182         cur_cpu_spec->pvr_value = mfspr(SPRN_PVR);
 183
 184         /* Initialize the base environment -- clear FSCR/HFSCR.  */
 185         hv_mode = !!(mfmsr() & MSR_HV);
 186         if (hv_mode) {
 187                 /* CPU_FTR_HVMODE is used early in PACA setup */
 188                 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
 189                 mtspr(SPRN_HFSCR, 0);
 190         }
 191         mtspr(SPRN_FSCR, 0);
 192
 193         /*
 194          * LPCR does not get cleared, to match behaviour with secondaries
 195          * in __restore_cpu_cpufeatures. Once the idle code is fixed, this
 196          * could clear LPCR too.
 197          */
 198 }
 199
 200 static int __init feat_try_enable_unknown(struct dt_cpu_feature *f)
 201 {
 202         if (f->hv_support == HV_SUPPORT_NONE) {
 203         } else if (f->hv_support & HV_SUPPORT_HFSCR) {
 204                 u64 hfscr = mfspr(SPRN_HFSCR);
 205                 hfscr |= 1UL << f->hfscr_bit_nr;
 206                 mtspr(SPRN_HFSCR, hfscr);
 207         } else {
 208                 /* Does not have a known recipe */
 209                 return 0;
 210         }
 211
 212         if (f->os_support == OS_SUPPORT_NONE) {
 213         } else if (f->os_support & OS_SUPPORT_FSCR) {
 214                 u64 fscr = mfspr(SPRN_FSCR);
 215                 fscr |= 1UL << f->fscr_bit_nr;
 216                 mtspr(SPRN_FSCR, fscr);
 217         } else {
 218                 /* Does not have a known recipe */
 219                 return 0;
 220         }
 221
 222         if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
 223                 uint32_t word = f->hwcap_bit_nr / 32;
 224                 uint32_t bit = f->hwcap_bit_nr % 32;
 225
 226                 if (word == 0)
 227                         cur_cpu_spec->cpu_user_features |= 1U << bit;
 228                 else if (word == 1)
 229                         cur_cpu_spec->cpu_user_features2 |= 1U << bit;
 230                 else
 231                         pr_err("%s could not advertise to user (no hwcap bits)\n", f->name);
 232         }
 233
 234         return 1;
 235 }
 236
 237 static int __init feat_enable(struct dt_cpu_feature *f)
 238 {
 239         if (f->hv_support != HV_SUPPORT_NONE) {
 240                 if (f->hfscr_bit_nr != -1) {
 241                         u64 hfscr = mfspr(SPRN_HFSCR);
 242                         hfscr |= 1UL << f->hfscr_bit_nr;
 243                         mtspr(SPRN_HFSCR, hfscr);
 244                 }
 245         }
 246
 247         if (f->os_support != OS_SUPPORT_NONE) {
 248                 if (f->fscr_bit_nr != -1) {
 249                         u64 fscr = mfspr(SPRN_FSCR);
 250                         fscr |= 1UL << f->fscr_bit_nr;
 251                         mtspr(SPRN_FSCR, fscr);
 252                 }
 253         }
 254
 255         if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
 256                 uint32_t word = f->hwcap_bit_nr / 32;
 257                 uint32_t bit = f->hwcap_bit_nr % 32;
 258
 259                 if (word == 0)
 260                         cur_cpu_spec->cpu_user_features |= 1U << bit;
 261                 else if (word == 1)
 262                         cur_cpu_spec->cpu_user_features2 |= 1U << bit;
 263                 else
 264                         pr_err("CPU feature: %s could not advertise to user (no hwcap bits)\n", f->name);
 265         }
 266
 267         return 1;
 268 }
 269
 270 static int __init feat_disable(struct dt_cpu_feature *f)
 271 {
 272         return 0;
 273 }
 274
 275 static int __init feat_enable_hv(struct dt_cpu_feature *f)
 276 {
 277         u64 lpcr;
 278
 279         if (!hv_mode) {
 280                 pr_err("CPU feature hypervisor present in device tree but HV mode not enabled in the CPU. Ignoring.\n");
 281                 return 0;
 282         }
 283
 284         mtspr(SPRN_LPID, 0);
 285
 286         lpcr = mfspr(SPRN_LPCR);
 287         lpcr &=  ~LPCR_LPES0; /* HV external interrupts */
 288         mtspr(SPRN_LPCR, lpcr);
 289
 290         cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
 291
 292         return 1;
 293 }
 294
 295 static int __init feat_enable_le(struct dt_cpu_feature *f)
 296 {
 297         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_TRUE_LE;
 298         return 1;
 299 }
 300
 301 static int __init feat_enable_smt(struct dt_cpu_feature *f)
 302 {
 303         cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 304         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_SMT;
 305         return 1;
 306 }
 307
 308 static int __init feat_enable_idle_nap(struct dt_cpu_feature *f)
 309 {
 310         u64 lpcr;
 311
 312         /* Set PECE wakeup modes for ISA 207 */
 313         lpcr = mfspr(SPRN_LPCR);
 314         lpcr |=  LPCR_PECE0;
 315         lpcr |=  LPCR_PECE1;
 316         lpcr |=  LPCR_PECE2;
 317         mtspr(SPRN_LPCR, lpcr);
 318
 319         return 1;
 320 }
 321
 322 static int __init feat_enable_align_dsisr(struct dt_cpu_feature *f)
 323 {
 324         cur_cpu_spec->cpu_features &= ~CPU_FTR_NODSISRALIGN;
 325
 326         return 1;
 327 }
 328
 329 static int __init feat_enable_idle_stop(struct dt_cpu_feature *f)
 330 {
 331         u64 lpcr;
 332
 333         /* Set PECE wakeup modes for ISAv3.0B */
 334         lpcr = mfspr(SPRN_LPCR);
 335         lpcr |=  LPCR_PECE0;
 336         lpcr |=  LPCR_PECE1;
 337         lpcr |=  LPCR_PECE2;
 338         mtspr(SPRN_LPCR, lpcr);
 339
 340         return 1;
 341 }
 342
 343 static int __init feat_enable_mmu_hash(struct dt_cpu_feature *f)
 344 {
 345         u64 lpcr;
 346
 347         lpcr = mfspr(SPRN_LPCR);
 348         lpcr &= ~LPCR_ISL;
 349
 350         /* VRMASD */
 351         lpcr |= LPCR_VPM0;
 352         lpcr &= ~LPCR_VPM1;
 353         lpcr |= 0x10UL << LPCR_VRMASD_SH; /* L=1 LP=00 */
 354         mtspr(SPRN_LPCR, lpcr);
 355
 356         cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
 357         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
 358
 359         return 1;
 360 }
 361
 362 static int __init feat_enable_mmu_hash_v3(struct dt_cpu_feature *f)
 363 {
 364         u64 lpcr;
 365
 366         lpcr = mfspr(SPRN_LPCR);
 367         lpcr &= ~LPCR_ISL;
 368         mtspr(SPRN_LPCR, lpcr);
 369
 370         cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
 371         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
 372
 373         return 1;
 374 }
 375
 376
 377 static int __init feat_enable_mmu_radix(struct dt_cpu_feature *f)
 378 {
 379 #ifdef CONFIG_PPC_RADIX_MMU
 380         cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX;
 381         cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
 382         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
 383
 384         return 1;
 385 #endif
 386         return 0;
 387 }
 388
 389 static int __init feat_enable_dscr(struct dt_cpu_feature *f)
 390 {
 391         u64 lpcr;
 392
 393         feat_enable(f);
 394
 395         lpcr = mfspr(SPRN_LPCR);
 396         lpcr &= ~LPCR_DPFD;
 397         lpcr |=  (4UL << LPCR_DPFD_SH);
 398         mtspr(SPRN_LPCR, lpcr);
 399
 400         return 1;
 401 }
 402
 403 static void hfscr_pmu_enable(void)
 404 {
 405         u64 hfscr = mfspr(SPRN_HFSCR);
 406         hfscr |= PPC_BIT(60);
 407         mtspr(SPRN_HFSCR, hfscr);
 408 }
 409
 410 static void init_pmu_power8(void)
 411 {
 412         if (hv_mode) {
 413                 mtspr(SPRN_MMCRC, 0);
 414                 mtspr(SPRN_MMCRH, 0);
 415         }
 416
 417         mtspr(SPRN_MMCRA, 0);
 418         mtspr(SPRN_MMCR0, 0);
 419         mtspr(SPRN_MMCR1, 0);
 420         mtspr(SPRN_MMCR2, 0);
 421         mtspr(SPRN_MMCRS, 0);
 422 }
 423
 424 static int __init feat_enable_mce_power8(struct dt_cpu_feature *f)
 425 {
 426         cur_cpu_spec->platform = "power8";
 427         cur_cpu_spec->flush_tlb = __flush_tlb_power8;
 428         cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p8;
 429
 430         return 1;
 431 }
 432
 433 static int __init feat_enable_pmu_power8(struct dt_cpu_feature *f)
 434 {
 435         hfscr_pmu_enable();
 436
 437         init_pmu_power8();
 438         init_pmu_registers = init_pmu_power8;
 439
 440         cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
 441         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
 442         if (pvr_version_is(PVR_POWER8E))
 443                 cur_cpu_spec->cpu_features |= CPU_FTR_PMAO_BUG;
 444
 445         cur_cpu_spec->num_pmcs          = 6;
 446         cur_cpu_spec->pmc_type          = PPC_PMC_IBM;
 447         cur_cpu_spec->oprofile_cpu_type = "ppc64/power8";
 448
 449         return 1;
 450 }
 451
 452 static void init_pmu_power9(void)
 453 {
 454         if (hv_mode)
 455                 mtspr(SPRN_MMCRC, 0);
 456
 457         mtspr(SPRN_MMCRA, 0);
 458         mtspr(SPRN_MMCR0, 0);
 459         mtspr(SPRN_MMCR1, 0);
 460         mtspr(SPRN_MMCR2, 0);
 461 }
 462
 463 static int __init feat_enable_mce_power9(struct dt_cpu_feature *f)
 464 {
 465         cur_cpu_spec->platform = "power9";
 466         cur_cpu_spec->flush_tlb = __flush_tlb_power9;
 467         cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p9;
 468
 469         return 1;
 470 }
 471
 472 static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f)
 473 {
 474         hfscr_pmu_enable();
 475
 476         init_pmu_power9();
 477         init_pmu_registers = init_pmu_power9;
 478
 479         cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
 480         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
 481
 482         cur_cpu_spec->num_pmcs          = 6;
 483         cur_cpu_spec->pmc_type          = PPC_PMC_IBM;
 484         cur_cpu_spec->oprofile_cpu_type = "ppc64/power9";
 485
 486         return 1;
 487 }
 488
 489 static int __init feat_enable_tm(struct dt_cpu_feature *f)
 490 {
 491 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 492         feat_enable(f);
 493         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NOSC;
 494         return 1;
 495 #endif
 496         return 0;
 497 }
 498
 499 static int __init feat_enable_fp(struct dt_cpu_feature *f)
 500 {
 501         feat_enable(f);
 502         cur_cpu_spec->cpu_features &= ~CPU_FTR_FPU_UNAVAILABLE;
 503
 504         return 1;
 505 }
 506
 507 static int __init feat_enable_vector(struct dt_cpu_feature *f)
 508 {
 509 #ifdef CONFIG_ALTIVEC
 510         feat_enable(f);
 511         cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
 512         cur_cpu_spec->cpu_features |= CPU_FTR_VMX_COPY;
 513         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
 514
 515         return 1;
 516 #endif
 517         return 0;
 518 }
 519
 520 static int __init feat_enable_vsx(struct dt_cpu_feature *f)
 521 {
 522 #ifdef CONFIG_VSX
 523         feat_enable(f);
 524         cur_cpu_spec->cpu_features |= CPU_FTR_VSX;
 525         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_VSX;
 526
 527         return 1;
 528 #endif
 529         return 0;
 530 }
 531
 532 static int __init feat_enable_purr(struct dt_cpu_feature *f)
 533 {
 534         cur_cpu_spec->cpu_features |= CPU_FTR_PURR | CPU_FTR_SPURR;
 535
 536         return 1;
 537 }
 538
 539 static int __init feat_enable_ebb(struct dt_cpu_feature *f)
 540 {
 541         /*
 542          * PPC_FEATURE2_EBB is enabled in PMU init code because it has
 543          * historically been related to the PMU facility. This may have
 544          * to be decoupled if EBB becomes more generic. For now, follow
 545          * existing convention.
 546          */
 547         f->hwcap_bit_nr = -1;
 548         feat_enable(f);
 549
 550         return 1;
 551 }
 552
 553 static int __init feat_enable_dbell(struct dt_cpu_feature *f)
 554 {
 555         u64 lpcr;
 556
 557         /* P9 has an HFSCR for privileged state */
 558         feat_enable(f);
 559
 560         cur_cpu_spec->cpu_features |= CPU_FTR_DBELL;
 561
 562         lpcr = mfspr(SPRN_LPCR);
 563         lpcr |=  LPCR_PECEDH; /* hyp doorbell wakeup */
 564         mtspr(SPRN_LPCR, lpcr);
 565
 566         return 1;
 567 }
 568
 569 static int __init feat_enable_hvi(struct dt_cpu_feature *f)
 570 {
 571         u64 lpcr;
 572
 573         /*
 574          * POWER9 XIVE interrupts including in OPAL XICS compatibility
 575          * are always delivered as hypervisor virtualization interrupts (HVI)
 576          * rather than EE.
 577          *
 578          * However LPES0 is not set here, in the chance that an EE does get
 579          * delivered to the host somehow, the EE handler would not expect it
 580          * to be delivered in LPES0 mode (e.g., using SRR[01]). This could
 581          * happen if there is a bug in interrupt controller code, or IC is
 582          * misconfigured in systemsim.
 583          */
 584
 585         lpcr = mfspr(SPRN_LPCR);
 586         lpcr |= LPCR_HVICE;     /* enable hvi interrupts */
 587         lpcr |= LPCR_HEIC;      /* disable ee interrupts when MSR_HV */
 588         lpcr |= LPCR_PECE_HVEE; /* hvi can wake from stop */
 589         mtspr(SPRN_LPCR, lpcr);
 590
 591         return 1;
 592 }
 593
 594 static int __init feat_enable_large_ci(struct dt_cpu_feature *f)
 595 {
 596         cur_cpu_spec->mmu_features |= MMU_FTR_CI_LARGE_PAGE;
 597
 598         return 1;
 599 }
 600
 601 struct dt_cpu_feature_match {
 602         const char *name;
 603         int (*enable)(struct dt_cpu_feature *f);
 604         u64 cpu_ftr_bit_mask;
 605 };
 606
 607 static struct dt_cpu_feature_match __initdata
 608                 dt_cpu_feature_match_table[] = {
 609         {"hypervisor", feat_enable_hv, 0},
 610         {"big-endian", feat_enable, 0},
 611         {"little-endian", feat_enable_le, CPU_FTR_REAL_LE},
 612         {"smt", feat_enable_smt, 0},
 613         {"interrupt-facilities", feat_enable, 0},
 614         {"timer-facilities", feat_enable, 0},
 615         {"timer-facilities-v3", feat_enable, 0},
 616         {"debug-facilities", feat_enable, 0},
 617         {"come-from-address-register", feat_enable, CPU_FTR_CFAR},
 618         {"branch-tracing", feat_enable, 0},
 619         {"floating-point", feat_enable_fp, 0},
 620         {"vector", feat_enable_vector, 0},
 621         {"vector-scalar", feat_enable_vsx, 0},
 622         {"vector-scalar-v3", feat_enable, 0},
 623         {"decimal-floating-point", feat_enable, 0},
 624         {"decimal-integer", feat_enable, 0},
 625         {"quadword-load-store", feat_enable, 0},
 626         {"vector-crypto", feat_enable, 0},
 627         {"mmu-hash", feat_enable_mmu_hash, 0},
 628         {"mmu-radix", feat_enable_mmu_radix, 0},
 629         {"mmu-hash-v3", feat_enable_mmu_hash_v3, 0},
 630         {"virtual-page-class-key-protection", feat_enable, 0},
 631         {"transactional-memory", feat_enable_tm, CPU_FTR_TM},
 632         {"transactional-memory-v3", feat_enable_tm, 0},
 633         {"idle-nap", feat_enable_idle_nap, 0},
 634         {"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0},
 635         {"idle-stop", feat_enable_idle_stop, 0},
 636         {"machine-check-power8", feat_enable_mce_power8, 0},
 637         {"performance-monitor-power8", feat_enable_pmu_power8, 0},
 638         {"data-stream-control-register", feat_enable_dscr, CPU_FTR_DSCR},
 639         {"event-based-branch", feat_enable_ebb, 0},
 640         {"target-address-register", feat_enable, 0},
 641         {"branch-history-rolling-buffer", feat_enable, 0},
 642         {"control-register", feat_enable, CPU_FTR_CTRL},
 643         {"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL},
 644         {"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL},
 645         {"processor-utilization-of-resources-register", feat_enable_purr, 0},
 646         {"no-execute", feat_enable, 0},
 647         {"strong-access-ordering", feat_enable, CPU_FTR_SAO},
 648         {"cache-inhibited-large-page", feat_enable_large_ci, 0},
 649         {"coprocessor-icswx", feat_enable, CPU_FTR_ICSWX},
 650         {"hypervisor-virtualization-interrupt", feat_enable_hvi, 0},
 651         {"program-priority-register", feat_enable, CPU_FTR_HAS_PPR},
 652         {"wait", feat_enable, 0},
 653         {"atomic-memory-operations", feat_enable, 0},
 654         {"branch-v3", feat_enable, 0},
 655         {"copy-paste", feat_enable, 0},
 656         {"decimal-floating-point-v3", feat_enable, 0},
 657         {"decimal-integer-v3", feat_enable, 0},
 658         {"fixed-point-v3", feat_enable, 0},
 659         {"floating-point-v3", feat_enable, 0},
 660         {"group-start-register", feat_enable, 0},
 661         {"pc-relative-addressing", feat_enable, 0},
 662         {"machine-check-power9", feat_enable_mce_power9, 0},
 663         {"performance-monitor-power9", feat_enable_pmu_power9, 0},
 664         {"event-based-branch-v3", feat_enable, 0},
 665         {"random-number-generator", feat_enable, 0},
 666         {"system-call-vectored", feat_disable, 0},
 667         {"trace-interrupt-v3", feat_enable, 0},
 668         {"vector-v3", feat_enable, 0},
 669         {"vector-binary128", feat_enable, 0},
 670         {"vector-binary16", feat_enable, 0},
 671         {"wait-v3", feat_enable, 0},
 672 };
 673
 674 static bool __initdata using_dt_cpu_ftrs;
 675 static bool __initdata enable_unknown = true;
 676
 677 static int __init dt_cpu_ftrs_parse(char *str)
 678 {
 679         if (!str)
 680                 return 0;
 681
 682         if (!strcmp(str, "off"))
 683                 using_dt_cpu_ftrs = false;
 684         else if (!strcmp(str, "known"))
 685                 enable_unknown = false;
 686         else
 687                 return 1;
 688
 689         return 0;
 690 }
 691 early_param("dt_cpu_ftrs", dt_cpu_ftrs_parse);
 692
 693 static void __init cpufeatures_setup_start(u32 isa)
 694 {
 695         pr_info("setup for ISA %d\n", isa);
 696
 697         if (isa >= 3000) {
 698                 cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300;
 699                 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00;
 700         }
 701 }
 702
 703 static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f)
 704 {
 705         const struct dt_cpu_feature_match *m;
 706         bool known = false;
 707         int i;
 708
 709         for (i = 0; i < ARRAY_SIZE(dt_cpu_feature_match_table); i++) {
 710                 m = &dt_cpu_feature_match_table[i];
 711                 if (!strcmp(f->name, m->name)) {
 712                         known = true;
 713                         if (m->enable(f))
 714                                 break;
 715
 716                         pr_info("not enabling: %s (disabled or unsupported by kernel)\n",
 717                                 f->name);
 718                         return false;
 719                 }
 720         }
 721
 722         if (!known && enable_unknown) {
 723                 if (!feat_try_enable_unknown(f)) {
 724                         pr_info("not enabling: %s (unknown and unsupported by kernel)\n",
 725                                 f->name);
 726                         return false;
 727                 }
 728         }
 729
 730         if (m->cpu_ftr_bit_mask)
 731                 cur_cpu_spec->cpu_features |= m->cpu_ftr_bit_mask;
 732
 733         if (known)
 734                 pr_debug("enabling: %s\n", f->name);
 735         else
 736                 pr_debug("enabling: %s (unknown)\n", f->name);
 737
 738         return true;
 739 }
 740
 741 static __init void cpufeatures_cpu_quirks(void)
 742 {
 743         int version = mfspr(SPRN_PVR);
 744
 745         /*
 746          * Not all quirks can be derived from the cpufeatures device tree.
 747          */
 748         if ((version & 0xffffff00) == 0x004e0100)
 749                 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1;
 750 }
 751
 752 static void __init cpufeatures_setup_finished(void)
 753 {
 754         cpufeatures_cpu_quirks();
 755
 756         if (hv_mode && !(cur_cpu_spec->cpu_features & CPU_FTR_HVMODE)) {
 757                 pr_err("hypervisor not present in device tree but HV mode is enabled in the CPU. Enabling.\n");
 758                 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
 759         }
 760
 761         system_registers.lpcr = mfspr(SPRN_LPCR);
 762         system_registers.hfscr = mfspr(SPRN_HFSCR);
 763         system_registers.fscr = mfspr(SPRN_FSCR);
 764
 765         cpufeatures_flush_tlb();
 766
 767         pr_info("final cpu/mmu features = 0x%016lx 0x%08x\n",
 768                 cur_cpu_spec->cpu_features, cur_cpu_spec->mmu_features);
 769 }
 770
 771 static int __init disabled_on_cmdline(void)
 772 {
 773         unsigned long root, chosen;
 774         const char *p;
 775
 776         root = of_get_flat_dt_root();
 777         chosen = of_get_flat_dt_subnode_by_name(root, "chosen");
 778         if (chosen == -FDT_ERR_NOTFOUND)
 779                 return false;
 780
 781         p = of_get_flat_dt_prop(chosen, "bootargs", NULL);
 782         if (!p)
 783                 return false;
 784
 785         if (strstr(p, "dt_cpu_ftrs=off"))
 786                 return true;
 787
 788         return false;
 789 }
 790
 791 static int __init fdt_find_cpu_features(unsigned long node, const char *uname,
 792                                         int depth, void *data)
 793 {
 794         if (of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features")
 795             && of_get_flat_dt_prop(node, "isa", NULL))
 796                 return 1;
 797
 798         return 0;
 799 }
 800
 801 bool __init dt_cpu_ftrs_in_use(void)
 802 {
 803         return using_dt_cpu_ftrs;
 804 }
 805
 806 bool __init dt_cpu_ftrs_init(void *fdt)
 807 {
 808         using_dt_cpu_ftrs = false;
 809
 810         /* Setup and verify the FDT, if it fails we just bail */
 811         if (!early_init_dt_verify(fdt))
 812                 return false;
 813
 814         if (!of_scan_flat_dt(fdt_find_cpu_features, NULL))
 815                 return false;
 816
 817         if (disabled_on_cmdline())
 818                 return false;
 819
 820         cpufeatures_setup_cpu();
 821
 822         using_dt_cpu_ftrs = true;
 823         return true;
 824 }
 825
 826 static int nr_dt_cpu_features;
 827 static struct dt_cpu_feature *dt_cpu_features;
 828
 829 static int __init process_cpufeatures_node(unsigned long node,
 830                                           const char *uname, int i)
 831 {
 832         const __be32 *prop;
 833         struct dt_cpu_feature *f;
 834         int len;
 835
 836         f = &dt_cpu_features[i];
 837         memset(f, 0, sizeof(struct dt_cpu_feature));
 838
 839         f->node = node;
 840
 841         f->name = uname;
 842
 843         prop = of_get_flat_dt_prop(node, "isa", &len);
 844         if (!prop) {
 845                 pr_warn("%s: missing isa property\n", uname);
 846                 return 0;
 847         }
 848         f->isa = be32_to_cpup(prop);
 849
 850         prop = of_get_flat_dt_prop(node, "usable-privilege", &len);
 851         if (!prop) {
 852                 pr_warn("%s: missing usable-privilege property", uname);
 853                 return 0;
 854         }
 855         f->usable_privilege = be32_to_cpup(prop);
 856
 857         prop = of_get_flat_dt_prop(node, "hv-support", &len);
 858         if (prop)
 859                 f->hv_support = be32_to_cpup(prop);
 860         else
 861                 f->hv_support = HV_SUPPORT_NONE;
 862
 863         prop = of_get_flat_dt_prop(node, "os-support", &len);
 864         if (prop)
 865                 f->os_support = be32_to_cpup(prop);
 866         else
 867                 f->os_support = OS_SUPPORT_NONE;
 868
 869         prop = of_get_flat_dt_prop(node, "hfscr-bit-nr", &len);
 870         if (prop)
 871                 f->hfscr_bit_nr = be32_to_cpup(prop);
 872         else
 873                 f->hfscr_bit_nr = -1;
 874         prop = of_get_flat_dt_prop(node, "fscr-bit-nr", &len);
 875         if (prop)
 876                 f->fscr_bit_nr = be32_to_cpup(prop);
 877         else
 878                 f->fscr_bit_nr = -1;
 879         prop = of_get_flat_dt_prop(node, "hwcap-bit-nr", &len);
 880         if (prop)
 881                 f->hwcap_bit_nr = be32_to_cpup(prop);
 882         else
 883                 f->hwcap_bit_nr = -1;
 884
 885         if (f->usable_privilege & USABLE_HV) {
 886                 if (!(mfmsr() & MSR_HV)) {
 887                         pr_warn("%s: HV feature passed to guest\n", uname);
 888                         return 0;
 889                 }
 890
 891                 if (f->hv_support == HV_SUPPORT_NONE && f->hfscr_bit_nr != -1) {
 892                         pr_warn("%s: unwanted hfscr_bit_nr\n", uname);
 893                         return 0;
 894                 }
 895
 896                 if (f->hv_support == HV_SUPPORT_HFSCR) {
 897                         if (f->hfscr_bit_nr == -1) {
 898                                 pr_warn("%s: missing hfscr_bit_nr\n", uname);
 899                                 return 0;
 900                         }
 901                 }
 902         } else {
 903                 if (f->hv_support != HV_SUPPORT_NONE || f->hfscr_bit_nr != -1) {
 904                         pr_warn("%s: unwanted hv_support/hfscr_bit_nr\n", uname);
 905                         return 0;
 906                 }
 907         }
 908
 909         if (f->usable_privilege & USABLE_OS) {
 910                 if (f->os_support == OS_SUPPORT_NONE && f->fscr_bit_nr != -1) {
 911                         pr_warn("%s: unwanted fscr_bit_nr\n", uname);
 912                         return 0;
 913                 }
 914
 915                 if (f->os_support == OS_SUPPORT_FSCR) {
 916                         if (f->fscr_bit_nr == -1) {
 917                                 pr_warn("%s: missing fscr_bit_nr\n", uname);
 918                                 return 0;
 919                         }
 920                 }
 921         } else {
 922                 if (f->os_support != OS_SUPPORT_NONE || f->fscr_bit_nr != -1) {
 923                         pr_warn("%s: unwanted os_support/fscr_bit_nr\n", uname);
 924                         return 0;
 925                 }
 926         }
 927
 928         if (!(f->usable_privilege & USABLE_PR)) {
 929                 if (f->hwcap_bit_nr != -1) {
 930                         pr_warn("%s: unwanted hwcap_bit_nr\n", uname);
 931                         return 0;
 932                 }
 933         }
 934
 935         /* Do all the independent features in the first pass */
 936         if (!of_get_flat_dt_prop(node, "dependencies", &len)) {
 937                 if (cpufeatures_process_feature(f))
 938                         f->enabled = 1;
 939                 else
 940                         f->disabled = 1;
 941         }
 942
 943         return 0;
 944 }
 945
 946 static void __init cpufeatures_deps_enable(struct dt_cpu_feature *f)
 947 {
 948         const __be32 *prop;
 949         int len;
 950         int nr_deps;
 951         int i;
 952
 953         if (f->enabled || f->disabled)
 954                 return;
 955
 956         prop = of_get_flat_dt_prop(f->node, "dependencies", &len);
 957         if (!prop) {
 958                 pr_warn("%s: missing dependencies property", f->name);
 959                 return;
 960         }
 961
 962         nr_deps = len / sizeof(int);
 963
 964         for (i = 0; i < nr_deps; i++) {
 965                 unsigned long phandle = be32_to_cpu(prop[i]);
 966                 int j;
 967
 968                 for (j = 0; j < nr_dt_cpu_features; j++) {
 969                         struct dt_cpu_feature *d = &dt_cpu_features[j];
 970
 971                         if (of_get_flat_dt_phandle(d->node) == phandle) {
 972                                 cpufeatures_deps_enable(d);
 973                                 if (d->disabled) {
 974                                         f->disabled = 1;
 975                                         return;
 976                                 }
 977                         }
 978                 }
 979         }
 980
 981         if (cpufeatures_process_feature(f))
 982                 f->enabled = 1;
 983         else
 984                 f->disabled = 1;
 985 }
 986
 987 static int __init scan_cpufeatures_subnodes(unsigned long node,
 988                                           const char *uname,
 989                                           void *data)
 990 {
 991         int *count = data;
 992
 993         process_cpufeatures_node(node, uname, *count);
 994
 995         (*count)++;
 996
 997         return 0;
 998 }
 999
1000 static int __init count_cpufeatures_subnodes(unsigned long node,
1001                                           const char *uname,
1002                                           void *data)
1003 {
1004         int *count = data;
1005
1006         (*count)++;
1007
1008         return 0;
1009 }
1010
1011 static int __init dt_cpu_ftrs_scan_callback(unsigned long node, const char
1012                                             *uname, int depth, void *data)
1013 {
1014         const __be32 *prop;
1015         int count, i;
1016         u32 isa;
1017
1018         /* We are scanning "ibm,powerpc-cpu-features" nodes only */
1019         if (!of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features"))
1020                 return 0;
1021
1022         prop = of_get_flat_dt_prop(node, "isa", NULL);
1023         if (!prop)
1024                 /* We checked before, "can't happen" */
1025                 return 0;
1026
1027         isa = be32_to_cpup(prop);
1028
1029         /* Count and allocate space for cpu features */
1030         of_scan_flat_dt_subnodes(node, count_cpufeatures_subnodes,
1031                                                 &nr_dt_cpu_features);
1032         dt_cpu_features = __va(
1033                 memblock_alloc(sizeof(struct dt_cpu_feature)*
1034                                 nr_dt_cpu_features, PAGE_SIZE));
1035
1036         cpufeatures_setup_start(isa);
1037
1038         /* Scan nodes into dt_cpu_features and enable those without deps  */
1039         count = 0;
1040         of_scan_flat_dt_subnodes(node, scan_cpufeatures_subnodes, &count);
1041
1042         /* Recursive enable remaining features with dependencies */
1043         for (i = 0; i < nr_dt_cpu_features; i++) {
1044                 struct dt_cpu_feature *f = &dt_cpu_features[i];
1045
1046                 cpufeatures_deps_enable(f);
1047         }
1048
1049         prop = of_get_flat_dt_prop(node, "display-name", NULL);
1050         if (prop && strlen((char *)prop) != 0) {
1051                 strlcpy(dt_cpu_name, (char *)prop, sizeof(dt_cpu_name));
1052                 cur_cpu_spec->cpu_name = dt_cpu_name;
1053         }
1054
1055         cpufeatures_setup_finished();
1056
1057         memblock_free(__pa(dt_cpu_features),
1058                         sizeof(struct dt_cpu_feature)*nr_dt_cpu_features);
1059
1060         return 0;
1061 }
1062
1063 void __init dt_cpu_ftrs_scan(void)
1064 {
1065         if (!using_dt_cpu_ftrs)
1066                 return;
1067
1068         of_scan_flat_dt(dt_cpu_ftrs_scan_callback, NULL);
1069 }