arch/powerpc/kernel/dt_cpu_ftrs.c

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