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 long __machine_check_early_realmode_p8(struct pt_regs *regs);
  81 extern long __machine_check_early_realmode_p9(struct pt_regs *regs);
  82
  83 static int hv_mode;
  84
  85 static struct {
  86         u64     lpcr;
  87         u64     hfscr;
  88         u64     fscr;
  89 } system_registers;
  90
  91 static void (*init_pmu_registers)(void);
  92
  93 static void __restore_cpu_cpufeatures(void)
  94 {
  95         /*
  96          * LPCR is restored by the power on engine already. It can be changed
  97          * after early init e.g., by radix enable, and we have no unified API
  98          * for saving and restoring such SPRs.
  99          *
 100          * This ->restore hook should really be removed from idle and register
 101          * restore moved directly into the idle restore code, because this code
 102          * doesn't know how idle is implemented or what it needs restored here.
 103          *
 104          * The best we can do to accommodate secondary boot and idle restore
 105          * for now is "or" LPCR with existing.
 106          */
 107
 108         mtspr(SPRN_LPCR, system_registers.lpcr | mfspr(SPRN_LPCR));
 109         if (hv_mode) {
 110                 mtspr(SPRN_LPID, 0);
 111                 mtspr(SPRN_HFSCR, system_registers.hfscr);
 112         }
 113         mtspr(SPRN_FSCR, system_registers.fscr);
 114
 115         if (init_pmu_registers)
 116                 init_pmu_registers();
 117 }
 118
 119 static char dt_cpu_name[64];
 120
 121 static struct cpu_spec __initdata base_cpu_spec = {
 122         .cpu_name               = NULL,
 123         .cpu_features           = CPU_FTRS_BASE,
 124         .cpu_user_features      = COMMON_USER_BASE,
 125         .cpu_user_features2     = COMMON_USER2_BASE,
 126         .mmu_features           = 0,
 127         .icache_bsize           = 32, /* minimum block size, fixed by */
 128         .dcache_bsize           = 32, /* cache info init.             */
 129         .num_pmcs               = 0,
 130         .pmc_type               = PPC_PMC_DEFAULT,
 131         .oprofile_cpu_type      = NULL,
 132         .oprofile_type          = PPC_OPROFILE_INVALID,
 133         .cpu_setup              = NULL,
 134         .cpu_restore            = __restore_cpu_cpufeatures,
 135         .machine_check_early    = NULL,
 136         .platform               = NULL,
 137 };
 138
 139 static void __init cpufeatures_setup_cpu(void)
 140 {
 141         set_cur_cpu_spec(&base_cpu_spec);
 142
 143         cur_cpu_spec->pvr_mask = -1;
 144         cur_cpu_spec->pvr_value = mfspr(SPRN_PVR);
 145
 146         /* Initialize the base environment -- clear FSCR/HFSCR.  */
 147         hv_mode = !!(mfmsr() & MSR_HV);
 148         if (hv_mode) {
 149                 /* CPU_FTR_HVMODE is used early in PACA setup */
 150                 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
 151                 mtspr(SPRN_HFSCR, 0);
 152         }
 153         mtspr(SPRN_FSCR, 0);
 154
 155         /*
 156          * LPCR does not get cleared, to match behaviour with secondaries
 157          * in __restore_cpu_cpufeatures. Once the idle code is fixed, this
 158          * could clear LPCR too.
 159          */
 160 }
 161
 162 static int __init feat_try_enable_unknown(struct dt_cpu_feature *f)
 163 {
 164         if (f->hv_support == HV_SUPPORT_NONE) {
 165         } else if (f->hv_support & HV_SUPPORT_HFSCR) {
 166                 u64 hfscr = mfspr(SPRN_HFSCR);
 167                 hfscr |= 1UL << f->hfscr_bit_nr;
 168                 mtspr(SPRN_HFSCR, hfscr);
 169         } else {
 170                 /* Does not have a known recipe */
 171                 return 0;
 172         }
 173
 174         if (f->os_support == OS_SUPPORT_NONE) {
 175         } else if (f->os_support & OS_SUPPORT_FSCR) {
 176                 u64 fscr = mfspr(SPRN_FSCR);
 177                 fscr |= 1UL << f->fscr_bit_nr;
 178                 mtspr(SPRN_FSCR, fscr);
 179         } else {
 180                 /* Does not have a known recipe */
 181                 return 0;
 182         }
 183
 184         if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
 185                 uint32_t word = f->hwcap_bit_nr / 32;
 186                 uint32_t bit = f->hwcap_bit_nr % 32;
 187
 188                 if (word == 0)
 189                         cur_cpu_spec->cpu_user_features |= 1U << bit;
 190                 else if (word == 1)
 191                         cur_cpu_spec->cpu_user_features2 |= 1U << bit;
 192                 else
 193                         pr_err("%s could not advertise to user (no hwcap bits)\n", f->name);
 194         }
 195
 196         return 1;
 197 }
 198
 199 static int __init feat_enable(struct dt_cpu_feature *f)
 200 {
 201         if (f->hv_support != HV_SUPPORT_NONE) {
 202                 if (f->hfscr_bit_nr != -1) {
 203                         u64 hfscr = mfspr(SPRN_HFSCR);
 204                         hfscr |= 1UL << f->hfscr_bit_nr;
 205                         mtspr(SPRN_HFSCR, hfscr);
 206                 }
 207         }
 208
 209         if (f->os_support != OS_SUPPORT_NONE) {
 210                 if (f->fscr_bit_nr != -1) {
 211                         u64 fscr = mfspr(SPRN_FSCR);
 212                         fscr |= 1UL << f->fscr_bit_nr;
 213                         mtspr(SPRN_FSCR, fscr);
 214                 }
 215         }
 216
 217         if ((f->usable_privilege & USABLE_PR) && (f->hwcap_bit_nr != -1)) {
 218                 uint32_t word = f->hwcap_bit_nr / 32;
 219                 uint32_t bit = f->hwcap_bit_nr % 32;
 220
 221                 if (word == 0)
 222                         cur_cpu_spec->cpu_user_features |= 1U << bit;
 223                 else if (word == 1)
 224                         cur_cpu_spec->cpu_user_features2 |= 1U << bit;
 225                 else
 226                         pr_err("CPU feature: %s could not advertise to user (no hwcap bits)\n", f->name);
 227         }
 228
 229         return 1;
 230 }
 231
 232 static int __init feat_disable(struct dt_cpu_feature *f)
 233 {
 234         return 0;
 235 }
 236
 237 static int __init feat_enable_hv(struct dt_cpu_feature *f)
 238 {
 239         u64 lpcr;
 240
 241         if (!hv_mode) {
 242                 pr_err("CPU feature hypervisor present in device tree but HV mode not enabled in the CPU. Ignoring.\n");
 243                 return 0;
 244         }
 245
 246         mtspr(SPRN_LPID, 0);
 247
 248         lpcr = mfspr(SPRN_LPCR);
 249         lpcr &=  ~LPCR_LPES0; /* HV external interrupts */
 250         mtspr(SPRN_LPCR, lpcr);
 251
 252         cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
 253
 254         return 1;
 255 }
 256
 257 static int __init feat_enable_le(struct dt_cpu_feature *f)
 258 {
 259         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_TRUE_LE;
 260         return 1;
 261 }
 262
 263 static int __init feat_enable_smt(struct dt_cpu_feature *f)
 264 {
 265         cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
 266         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_SMT;
 267         return 1;
 268 }
 269
 270 static int __init feat_enable_idle_nap(struct dt_cpu_feature *f)
 271 {
 272         u64 lpcr;
 273
 274         /* Set PECE wakeup modes for ISA 207 */
 275         lpcr = mfspr(SPRN_LPCR);
 276         lpcr |=  LPCR_PECE0;
 277         lpcr |=  LPCR_PECE1;
 278         lpcr |=  LPCR_PECE2;
 279         mtspr(SPRN_LPCR, lpcr);
 280
 281         return 1;
 282 }
 283
 284 static int __init feat_enable_align_dsisr(struct dt_cpu_feature *f)
 285 {
 286         cur_cpu_spec->cpu_features &= ~CPU_FTR_NODSISRALIGN;
 287
 288         return 1;
 289 }
 290
 291 static int __init feat_enable_idle_stop(struct dt_cpu_feature *f)
 292 {
 293         u64 lpcr;
 294
 295         /* Set PECE wakeup modes for ISAv3.0B */
 296         lpcr = mfspr(SPRN_LPCR);
 297         lpcr |=  LPCR_PECE0;
 298         lpcr |=  LPCR_PECE1;
 299         lpcr |=  LPCR_PECE2;
 300         mtspr(SPRN_LPCR, lpcr);
 301
 302         return 1;
 303 }
 304
 305 static int __init feat_enable_mmu_hash(struct dt_cpu_feature *f)
 306 {
 307         u64 lpcr;
 308
 309         lpcr = mfspr(SPRN_LPCR);
 310         lpcr &= ~LPCR_ISL;
 311
 312         /* VRMASD */
 313         lpcr |= LPCR_VPM0;
 314         lpcr &= ~LPCR_VPM1;
 315         lpcr |= 0x10UL << LPCR_VRMASD_SH; /* L=1 LP=00 */
 316         mtspr(SPRN_LPCR, lpcr);
 317
 318         cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
 319         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
 320
 321         return 1;
 322 }
 323
 324 static int __init feat_enable_mmu_hash_v3(struct dt_cpu_feature *f)
 325 {
 326         u64 lpcr;
 327
 328         lpcr = mfspr(SPRN_LPCR);
 329         lpcr &= ~LPCR_ISL;
 330         mtspr(SPRN_LPCR, lpcr);
 331
 332         cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
 333         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
 334
 335         return 1;
 336 }
 337
 338
 339 static int __init feat_enable_mmu_radix(struct dt_cpu_feature *f)
 340 {
 341 #ifdef CONFIG_PPC_RADIX_MMU
 342         cur_cpu_spec->mmu_features |= MMU_FTR_TYPE_RADIX;
 343         cur_cpu_spec->mmu_features |= MMU_FTRS_HASH_BASE;
 344         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_MMU;
 345
 346         return 1;
 347 #endif
 348         return 0;
 349 }
 350
 351 static int __init feat_enable_dscr(struct dt_cpu_feature *f)
 352 {
 353         u64 lpcr;
 354
 355         feat_enable(f);
 356
 357         lpcr = mfspr(SPRN_LPCR);
 358         lpcr &= ~LPCR_DPFD;
 359         lpcr |=  (4UL << LPCR_DPFD_SH);
 360         mtspr(SPRN_LPCR, lpcr);
 361
 362         return 1;
 363 }
 364
 365 static void hfscr_pmu_enable(void)
 366 {
 367         u64 hfscr = mfspr(SPRN_HFSCR);
 368         hfscr |= PPC_BIT(60);
 369         mtspr(SPRN_HFSCR, hfscr);
 370 }
 371
 372 static void init_pmu_power8(void)
 373 {
 374         if (hv_mode) {
 375                 mtspr(SPRN_MMCRC, 0);
 376                 mtspr(SPRN_MMCRH, 0);
 377         }
 378
 379         mtspr(SPRN_MMCRA, 0);
 380         mtspr(SPRN_MMCR0, 0);
 381         mtspr(SPRN_MMCR1, 0);
 382         mtspr(SPRN_MMCR2, 0);
 383         mtspr(SPRN_MMCRS, 0);
 384 }
 385
 386 static int __init feat_enable_mce_power8(struct dt_cpu_feature *f)
 387 {
 388         cur_cpu_spec->platform = "power8";
 389         cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p8;
 390
 391         return 1;
 392 }
 393
 394 static int __init feat_enable_pmu_power8(struct dt_cpu_feature *f)
 395 {
 396         hfscr_pmu_enable();
 397
 398         init_pmu_power8();
 399         init_pmu_registers = init_pmu_power8;
 400
 401         cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
 402         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
 403         if (pvr_version_is(PVR_POWER8E))
 404                 cur_cpu_spec->cpu_features |= CPU_FTR_PMAO_BUG;
 405
 406         cur_cpu_spec->num_pmcs          = 6;
 407         cur_cpu_spec->pmc_type          = PPC_PMC_IBM;
 408         cur_cpu_spec->oprofile_cpu_type = "ppc64/power8";
 409
 410         return 1;
 411 }
 412
 413 static void init_pmu_power9(void)
 414 {
 415         if (hv_mode)
 416                 mtspr(SPRN_MMCRC, 0);
 417
 418         mtspr(SPRN_MMCRA, 0);
 419         mtspr(SPRN_MMCR0, 0);
 420         mtspr(SPRN_MMCR1, 0);
 421         mtspr(SPRN_MMCR2, 0);
 422 }
 423
 424 static int __init feat_enable_mce_power9(struct dt_cpu_feature *f)
 425 {
 426         cur_cpu_spec->platform = "power9";
 427         cur_cpu_spec->machine_check_early = __machine_check_early_realmode_p9;
 428
 429         return 1;
 430 }
 431
 432 static int __init feat_enable_pmu_power9(struct dt_cpu_feature *f)
 433 {
 434         hfscr_pmu_enable();
 435
 436         init_pmu_power9();
 437         init_pmu_registers = init_pmu_power9;
 438
 439         cur_cpu_spec->cpu_features |= CPU_FTR_MMCRA;
 440         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_PSERIES_PERFMON_COMPAT;
 441
 442         cur_cpu_spec->num_pmcs          = 6;
 443         cur_cpu_spec->pmc_type          = PPC_PMC_IBM;
 444         cur_cpu_spec->oprofile_cpu_type = "ppc64/power9";
 445
 446         return 1;
 447 }
 448
 449 static int __init feat_enable_tm(struct dt_cpu_feature *f)
 450 {
 451 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 452         feat_enable(f);
 453         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NOSC;
 454         return 1;
 455 #endif
 456         return 0;
 457 }
 458
 459 static int __init feat_enable_fp(struct dt_cpu_feature *f)
 460 {
 461         feat_enable(f);
 462         cur_cpu_spec->cpu_features &= ~CPU_FTR_FPU_UNAVAILABLE;
 463
 464         return 1;
 465 }
 466
 467 static int __init feat_enable_vector(struct dt_cpu_feature *f)
 468 {
 469 #ifdef CONFIG_ALTIVEC
 470         feat_enable(f);
 471         cur_cpu_spec->cpu_features |= CPU_FTR_ALTIVEC;
 472         cur_cpu_spec->cpu_features |= CPU_FTR_VMX_COPY;
 473         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
 474
 475         return 1;
 476 #endif
 477         return 0;
 478 }
 479
 480 static int __init feat_enable_vsx(struct dt_cpu_feature *f)
 481 {
 482 #ifdef CONFIG_VSX
 483         feat_enable(f);
 484         cur_cpu_spec->cpu_features |= CPU_FTR_VSX;
 485         cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_VSX;
 486
 487         return 1;
 488 #endif
 489         return 0;
 490 }
 491
 492 static int __init feat_enable_purr(struct dt_cpu_feature *f)
 493 {
 494         cur_cpu_spec->cpu_features |= CPU_FTR_PURR | CPU_FTR_SPURR;
 495
 496         return 1;
 497 }
 498
 499 static int __init feat_enable_ebb(struct dt_cpu_feature *f)
 500 {
 501         /*
 502          * PPC_FEATURE2_EBB is enabled in PMU init code because it has
 503          * historically been related to the PMU facility. This may have
 504          * to be decoupled if EBB becomes more generic. For now, follow
 505          * existing convention.
 506          */
 507         f->hwcap_bit_nr = -1;
 508         feat_enable(f);
 509
 510         return 1;
 511 }
 512
 513 static int __init feat_enable_dbell(struct dt_cpu_feature *f)
 514 {
 515         u64 lpcr;
 516
 517         /* P9 has an HFSCR for privileged state */
 518         feat_enable(f);
 519
 520         cur_cpu_spec->cpu_features |= CPU_FTR_DBELL;
 521
 522         lpcr = mfspr(SPRN_LPCR);
 523         lpcr |=  LPCR_PECEDH; /* hyp doorbell wakeup */
 524         mtspr(SPRN_LPCR, lpcr);
 525
 526         return 1;
 527 }
 528
 529 static int __init feat_enable_hvi(struct dt_cpu_feature *f)
 530 {
 531         u64 lpcr;
 532
 533         /*
 534          * POWER9 XIVE interrupts including in OPAL XICS compatibility
 535          * are always delivered as hypervisor virtualization interrupts (HVI)
 536          * rather than EE.
 537          *
 538          * However LPES0 is not set here, in the chance that an EE does get
 539          * delivered to the host somehow, the EE handler would not expect it
 540          * to be delivered in LPES0 mode (e.g., using SRR[01]). This could
 541          * happen if there is a bug in interrupt controller code, or IC is
 542          * misconfigured in systemsim.
 543          */
 544
 545         lpcr = mfspr(SPRN_LPCR);
 546         lpcr |= LPCR_HVICE;     /* enable hvi interrupts */
 547         lpcr |= LPCR_HEIC;      /* disable ee interrupts when MSR_HV */
 548         lpcr |= LPCR_PECE_HVEE; /* hvi can wake from stop */
 549         mtspr(SPRN_LPCR, lpcr);
 550
 551         return 1;
 552 }
 553
 554 static int __init feat_enable_large_ci(struct dt_cpu_feature *f)
 555 {
 556         cur_cpu_spec->mmu_features |= MMU_FTR_CI_LARGE_PAGE;
 557
 558         return 1;
 559 }
 560
 561 struct dt_cpu_feature_match {
 562         const char *name;
 563         int (*enable)(struct dt_cpu_feature *f);
 564         u64 cpu_ftr_bit_mask;
 565 };
 566
 567 static struct dt_cpu_feature_match __initdata
 568                 dt_cpu_feature_match_table[] = {
 569         {"hypervisor", feat_enable_hv, 0},
 570         {"big-endian", feat_enable, 0},
 571         {"little-endian", feat_enable_le, CPU_FTR_REAL_LE},
 572         {"smt", feat_enable_smt, 0},
 573         {"interrupt-facilities", feat_enable, 0},
 574         {"timer-facilities", feat_enable, 0},
 575         {"timer-facilities-v3", feat_enable, 0},
 576         {"debug-facilities", feat_enable, 0},
 577         {"come-from-address-register", feat_enable, CPU_FTR_CFAR},
 578         {"branch-tracing", feat_enable, 0},
 579         {"floating-point", feat_enable_fp, 0},
 580         {"vector", feat_enable_vector, 0},
 581         {"vector-scalar", feat_enable_vsx, 0},
 582         {"vector-scalar-v3", feat_enable, 0},
 583         {"decimal-floating-point", feat_enable, 0},
 584         {"decimal-integer", feat_enable, 0},
 585         {"quadword-load-store", feat_enable, 0},
 586         {"vector-crypto", feat_enable, 0},
 587         {"mmu-hash", feat_enable_mmu_hash, 0},
 588         {"mmu-radix", feat_enable_mmu_radix, 0},
 589         {"mmu-hash-v3", feat_enable_mmu_hash_v3, 0},
 590         {"virtual-page-class-key-protection", feat_enable, 0},
 591         {"transactional-memory", feat_enable_tm, CPU_FTR_TM},
 592         {"transactional-memory-v3", feat_enable_tm, 0},
 593         {"idle-nap", feat_enable_idle_nap, 0},
 594         {"alignment-interrupt-dsisr", feat_enable_align_dsisr, 0},
 595         {"idle-stop", feat_enable_idle_stop, 0},
 596         {"machine-check-power8", feat_enable_mce_power8, 0},
 597         {"performance-monitor-power8", feat_enable_pmu_power8, 0},
 598         {"data-stream-control-register", feat_enable_dscr, CPU_FTR_DSCR},
 599         {"event-based-branch", feat_enable_ebb, 0},
 600         {"target-address-register", feat_enable, 0},
 601         {"branch-history-rolling-buffer", feat_enable, 0},
 602         {"control-register", feat_enable, CPU_FTR_CTRL},
 603         {"processor-control-facility", feat_enable_dbell, CPU_FTR_DBELL},
 604         {"processor-control-facility-v3", feat_enable_dbell, CPU_FTR_DBELL},
 605         {"processor-utilization-of-resources-register", feat_enable_purr, 0},
 606         {"no-execute", feat_enable, 0},
 607         {"strong-access-ordering", feat_enable, CPU_FTR_SAO},
 608         {"cache-inhibited-large-page", feat_enable_large_ci, 0},
 609         {"coprocessor-icswx", feat_enable, 0},
 610         {"hypervisor-virtualization-interrupt", feat_enable_hvi, 0},
 611         {"program-priority-register", feat_enable, CPU_FTR_HAS_PPR},
 612         {"wait", feat_enable, 0},
 613         {"atomic-memory-operations", feat_enable, 0},
 614         {"branch-v3", feat_enable, 0},
 615         {"copy-paste", feat_enable, 0},
 616         {"decimal-floating-point-v3", feat_enable, 0},
 617         {"decimal-integer-v3", feat_enable, 0},
 618         {"fixed-point-v3", feat_enable, 0},
 619         {"floating-point-v3", feat_enable, 0},
 620         {"group-start-register", feat_enable, 0},
 621         {"pc-relative-addressing", feat_enable, 0},
 622         {"machine-check-power9", feat_enable_mce_power9, 0},
 623         {"performance-monitor-power9", feat_enable_pmu_power9, 0},
 624         {"event-based-branch-v3", feat_enable, 0},
 625         {"random-number-generator", feat_enable, 0},
 626         {"system-call-vectored", feat_disable, 0},
 627         {"trace-interrupt-v3", feat_enable, 0},
 628         {"vector-v3", feat_enable, 0},
 629         {"vector-binary128", feat_enable, 0},
 630         {"vector-binary16", feat_enable, 0},
 631         {"wait-v3", feat_enable, 0},
 632 };
 633
 634 static bool __initdata using_dt_cpu_ftrs;
 635 static bool __initdata enable_unknown = true;
 636
 637 static int __init dt_cpu_ftrs_parse(char *str)
 638 {
 639         if (!str)
 640                 return 0;
 641
 642         if (!strcmp(str, "off"))
 643                 using_dt_cpu_ftrs = false;
 644         else if (!strcmp(str, "known"))
 645                 enable_unknown = false;
 646         else
 647                 return 1;
 648
 649         return 0;
 650 }
 651 early_param("dt_cpu_ftrs", dt_cpu_ftrs_parse);
 652
 653 static void __init cpufeatures_setup_start(u32 isa)
 654 {
 655         pr_info("setup for ISA %d\n", isa);
 656
 657         if (isa >= 3000) {
 658                 cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300;
 659                 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00;
 660         }
 661 }
 662
 663 static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f)
 664 {
 665         const struct dt_cpu_feature_match *m;
 666         bool known = false;
 667         int i;
 668
 669         for (i = 0; i < ARRAY_SIZE(dt_cpu_feature_match_table); i++) {
 670                 m = &dt_cpu_feature_match_table[i];
 671                 if (!strcmp(f->name, m->name)) {
 672                         known = true;
 673                         if (m->enable(f))
 674                                 break;
 675
 676                         pr_info("not enabling: %s (disabled or unsupported by kernel)\n",
 677                                 f->name);
 678                         return false;
 679                 }
 680         }
 681
 682         if (!known && enable_unknown) {
 683                 if (!feat_try_enable_unknown(f)) {
 684                         pr_info("not enabling: %s (unknown and unsupported by kernel)\n",
 685                                 f->name);
 686                         return false;
 687                 }
 688         }
 689
 690         if (m->cpu_ftr_bit_mask)
 691                 cur_cpu_spec->cpu_features |= m->cpu_ftr_bit_mask;
 692
 693         if (known)
 694                 pr_debug("enabling: %s\n", f->name);
 695         else
 696                 pr_debug("enabling: %s (unknown)\n", f->name);
 697
 698         return true;
 699 }
 700
 701 static __init void cpufeatures_cpu_quirks(void)
 702 {
 703         int version = mfspr(SPRN_PVR);
 704
 705         /*
 706          * Not all quirks can be derived from the cpufeatures device tree.
 707          */
 708         if ((version & 0xffffff00) == 0x004e0100)
 709                 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1;
 710         else if ((version & 0xffffefff) == 0x004e0201)
 711                 cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
 712 }
 713
 714 static void __init cpufeatures_setup_finished(void)
 715 {
 716         cpufeatures_cpu_quirks();
 717
 718         if (hv_mode && !(cur_cpu_spec->cpu_features & CPU_FTR_HVMODE)) {
 719                 pr_err("hypervisor not present in device tree but HV mode is enabled in the CPU. Enabling.\n");
 720                 cur_cpu_spec->cpu_features |= CPU_FTR_HVMODE;
 721         }
 722
 723         system_registers.lpcr = mfspr(SPRN_LPCR);
 724         system_registers.hfscr = mfspr(SPRN_HFSCR);
 725         system_registers.fscr = mfspr(SPRN_FSCR);
 726
 727         pr_info("final cpu/mmu features = 0x%016lx 0x%08x\n",
 728                 cur_cpu_spec->cpu_features, cur_cpu_spec->mmu_features);
 729 }
 730
 731 static int __init disabled_on_cmdline(void)
 732 {
 733         unsigned long root, chosen;
 734         const char *p;
 735
 736         root = of_get_flat_dt_root();
 737         chosen = of_get_flat_dt_subnode_by_name(root, "chosen");
 738         if (chosen == -FDT_ERR_NOTFOUND)
 739                 return false;
 740
 741         p = of_get_flat_dt_prop(chosen, "bootargs", NULL);
 742         if (!p)
 743                 return false;
 744
 745         if (strstr(p, "dt_cpu_ftrs=off"))
 746                 return true;
 747
 748         return false;
 749 }
 750
 751 static int __init fdt_find_cpu_features(unsigned long node, const char *uname,
 752                                         int depth, void *data)
 753 {
 754         if (of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features")
 755             && of_get_flat_dt_prop(node, "isa", NULL))
 756                 return 1;
 757
 758         return 0;
 759 }
 760
 761 bool __init dt_cpu_ftrs_in_use(void)
 762 {
 763         return using_dt_cpu_ftrs;
 764 }
 765
 766 bool __init dt_cpu_ftrs_init(void *fdt)
 767 {
 768         using_dt_cpu_ftrs = false;
 769
 770         /* Setup and verify the FDT, if it fails we just bail */
 771         if (!early_init_dt_verify(fdt))
 772                 return false;
 773
 774         if (!of_scan_flat_dt(fdt_find_cpu_features, NULL))
 775                 return false;
 776
 777         if (disabled_on_cmdline())
 778                 return false;
 779
 780         cpufeatures_setup_cpu();
 781
 782         using_dt_cpu_ftrs = true;
 783         return true;
 784 }
 785
 786 static int nr_dt_cpu_features;
 787 static struct dt_cpu_feature *dt_cpu_features;
 788
 789 static int __init process_cpufeatures_node(unsigned long node,
 790                                           const char *uname, int i)
 791 {
 792         const __be32 *prop;
 793         struct dt_cpu_feature *f;
 794         int len;
 795
 796         f = &dt_cpu_features[i];
 797         memset(f, 0, sizeof(struct dt_cpu_feature));
 798
 799         f->node = node;
 800
 801         f->name = uname;
 802
 803         prop = of_get_flat_dt_prop(node, "isa", &len);
 804         if (!prop) {
 805                 pr_warn("%s: missing isa property\n", uname);
 806                 return 0;
 807         }
 808         f->isa = be32_to_cpup(prop);
 809
 810         prop = of_get_flat_dt_prop(node, "usable-privilege", &len);
 811         if (!prop) {
 812                 pr_warn("%s: missing usable-privilege property", uname);
 813                 return 0;
 814         }
 815         f->usable_privilege = be32_to_cpup(prop);
 816
 817         prop = of_get_flat_dt_prop(node, "hv-support", &len);
 818         if (prop)
 819                 f->hv_support = be32_to_cpup(prop);
 820         else
 821                 f->hv_support = HV_SUPPORT_NONE;
 822
 823         prop = of_get_flat_dt_prop(node, "os-support", &len);
 824         if (prop)
 825                 f->os_support = be32_to_cpup(prop);
 826         else
 827                 f->os_support = OS_SUPPORT_NONE;
 828
 829         prop = of_get_flat_dt_prop(node, "hfscr-bit-nr", &len);
 830         if (prop)
 831                 f->hfscr_bit_nr = be32_to_cpup(prop);
 832         else
 833                 f->hfscr_bit_nr = -1;
 834         prop = of_get_flat_dt_prop(node, "fscr-bit-nr", &len);
 835         if (prop)
 836                 f->fscr_bit_nr = be32_to_cpup(prop);
 837         else
 838                 f->fscr_bit_nr = -1;
 839         prop = of_get_flat_dt_prop(node, "hwcap-bit-nr", &len);
 840         if (prop)
 841                 f->hwcap_bit_nr = be32_to_cpup(prop);
 842         else
 843                 f->hwcap_bit_nr = -1;
 844
 845         if (f->usable_privilege & USABLE_HV) {
 846                 if (!(mfmsr() & MSR_HV)) {
 847                         pr_warn("%s: HV feature passed to guest\n", uname);
 848                         return 0;
 849                 }
 850
 851                 if (f->hv_support == HV_SUPPORT_NONE && f->hfscr_bit_nr != -1) {
 852                         pr_warn("%s: unwanted hfscr_bit_nr\n", uname);
 853                         return 0;
 854                 }
 855
 856                 if (f->hv_support == HV_SUPPORT_HFSCR) {
 857                         if (f->hfscr_bit_nr == -1) {
 858                                 pr_warn("%s: missing hfscr_bit_nr\n", uname);
 859                                 return 0;
 860                         }
 861                 }
 862         } else {
 863                 if (f->hv_support != HV_SUPPORT_NONE || f->hfscr_bit_nr != -1) {
 864                         pr_warn("%s: unwanted hv_support/hfscr_bit_nr\n", uname);
 865                         return 0;
 866                 }
 867         }
 868
 869         if (f->usable_privilege & USABLE_OS) {
 870                 if (f->os_support == OS_SUPPORT_NONE && f->fscr_bit_nr != -1) {
 871                         pr_warn("%s: unwanted fscr_bit_nr\n", uname);
 872                         return 0;
 873                 }
 874
 875                 if (f->os_support == OS_SUPPORT_FSCR) {
 876                         if (f->fscr_bit_nr == -1) {
 877                                 pr_warn("%s: missing fscr_bit_nr\n", uname);
 878                                 return 0;
 879                         }
 880                 }
 881         } else {
 882                 if (f->os_support != OS_SUPPORT_NONE || f->fscr_bit_nr != -1) {
 883                         pr_warn("%s: unwanted os_support/fscr_bit_nr\n", uname);
 884                         return 0;
 885                 }
 886         }
 887
 888         if (!(f->usable_privilege & USABLE_PR)) {
 889                 if (f->hwcap_bit_nr != -1) {
 890                         pr_warn("%s: unwanted hwcap_bit_nr\n", uname);
 891                         return 0;
 892                 }
 893         }
 894
 895         /* Do all the independent features in the first pass */
 896         if (!of_get_flat_dt_prop(node, "dependencies", &len)) {
 897                 if (cpufeatures_process_feature(f))
 898                         f->enabled = 1;
 899                 else
 900                         f->disabled = 1;
 901         }
 902
 903         return 0;
 904 }
 905
 906 static void __init cpufeatures_deps_enable(struct dt_cpu_feature *f)
 907 {
 908         const __be32 *prop;
 909         int len;
 910         int nr_deps;
 911         int i;
 912
 913         if (f->enabled || f->disabled)
 914                 return;
 915
 916         prop = of_get_flat_dt_prop(f->node, "dependencies", &len);
 917         if (!prop) {
 918                 pr_warn("%s: missing dependencies property", f->name);
 919                 return;
 920         }
 921
 922         nr_deps = len / sizeof(int);
 923
 924         for (i = 0; i < nr_deps; i++) {
 925                 unsigned long phandle = be32_to_cpu(prop[i]);
 926                 int j;
 927
 928                 for (j = 0; j < nr_dt_cpu_features; j++) {
 929                         struct dt_cpu_feature *d = &dt_cpu_features[j];
 930
 931                         if (of_get_flat_dt_phandle(d->node) == phandle) {
 932                                 cpufeatures_deps_enable(d);
 933                                 if (d->disabled) {
 934                                         f->disabled = 1;
 935                                         return;
 936                                 }
 937                         }
 938                 }
 939         }
 940
 941         if (cpufeatures_process_feature(f))
 942                 f->enabled = 1;
 943         else
 944                 f->disabled = 1;
 945 }
 946
 947 static int __init scan_cpufeatures_subnodes(unsigned long node,
 948                                           const char *uname,
 949                                           void *data)
 950 {
 951         int *count = data;
 952
 953         process_cpufeatures_node(node, uname, *count);
 954
 955         (*count)++;
 956
 957         return 0;
 958 }
 959
 960 static int __init count_cpufeatures_subnodes(unsigned long node,
 961                                           const char *uname,
 962                                           void *data)
 963 {
 964         int *count = data;
 965
 966         (*count)++;
 967
 968         return 0;
 969 }
 970
 971 static int __init dt_cpu_ftrs_scan_callback(unsigned long node, const char
 972                                             *uname, int depth, void *data)
 973 {
 974         const __be32 *prop;
 975         int count, i;
 976         u32 isa;
 977
 978         /* We are scanning "ibm,powerpc-cpu-features" nodes only */
 979         if (!of_flat_dt_is_compatible(node, "ibm,powerpc-cpu-features"))
 980                 return 0;
 981
 982         prop = of_get_flat_dt_prop(node, "isa", NULL);
 983         if (!prop)
 984                 /* We checked before, "can't happen" */
 985                 return 0;
 986
 987         isa = be32_to_cpup(prop);
 988
 989         /* Count and allocate space for cpu features */
 990         of_scan_flat_dt_subnodes(node, count_cpufeatures_subnodes,
 991                                                 &nr_dt_cpu_features);
 992         dt_cpu_features = __va(
 993                 memblock_alloc(sizeof(struct dt_cpu_feature)*
 994                                 nr_dt_cpu_features, PAGE_SIZE));
 995
 996         cpufeatures_setup_start(isa);
 997
 998         /* Scan nodes into dt_cpu_features and enable those without deps  */
 999         count = 0;
1000         of_scan_flat_dt_subnodes(node, scan_cpufeatures_subnodes, &count);
1001
1002         /* Recursive enable remaining features with dependencies */
1003         for (i = 0; i < nr_dt_cpu_features; i++) {
1004                 struct dt_cpu_feature *f = &dt_cpu_features[i];
1005
1006                 cpufeatures_deps_enable(f);
1007         }
1008
1009         prop = of_get_flat_dt_prop(node, "display-name", NULL);
1010         if (prop && strlen((char *)prop) != 0) {
1011                 strlcpy(dt_cpu_name, (char *)prop, sizeof(dt_cpu_name));
1012                 cur_cpu_spec->cpu_name = dt_cpu_name;
1013         }
1014
1015         cpufeatures_setup_finished();
1016
1017         memblock_free(__pa(dt_cpu_features),
1018                         sizeof(struct dt_cpu_feature)*nr_dt_cpu_features);
1019
1020         return 0;
1021 }
1022
1023 void __init dt_cpu_ftrs_scan(void)
1024 {
1025         if (!using_dt_cpu_ftrs)
1026                 return;
1027
1028         of_scan_flat_dt(dt_cpu_ftrs_scan_callback, NULL);
1029 }