drivers/firmware/psci/psci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (C) 2015 ARM Limited
   5  */
   6
   7 #define pr_fmt(fmt) "psci: " fmt
   8
   9 #include <linux/acpi.h>
  10 #include <linux/arm-smccc.h>
  11 #include <linux/cpuidle.h>
  12 #include <linux/debugfs.h>
  13 #include <linux/errno.h>
  14 #include <linux/linkage.h>
  15 #include <linux/of.h>
  16 #include <linux/pm.h>
  17 #include <linux/printk.h>
  18 #include <linux/psci.h>
  19 #include <linux/reboot.h>
  20 #include <linux/slab.h>
  21 #include <linux/suspend.h>
  22
  23 #include <uapi/linux/psci.h>
  24
  25 #include <asm/cpuidle.h>
  26 #include <asm/cputype.h>
  27 #include <asm/hypervisor.h>
  28 #include <asm/system_misc.h>
  29 #include <asm/smp_plat.h>
  30 #include <asm/suspend.h>
  31
  32 /*
  33  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
  34  * calls it is necessary to use SMC64 to pass or return 64-bit values.
  35  * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
  36  * (native-width) function ID.
  37  */
  38 #ifdef CONFIG_64BIT
  39 #define PSCI_FN_NATIVE(version, name)   PSCI_##version##_FN64_##name
  40 #else
  41 #define PSCI_FN_NATIVE(version, name)   PSCI_##version##_FN_##name
  42 #endif
  43
  44 /*
  45  * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
  46  * calls to its resident CPU, so we must avoid issuing those. We never migrate
  47  * a Trusted OS even if it claims to be capable of migration -- doing so will
  48  * require cooperation with a Trusted OS driver.
  49  */
  50 static int resident_cpu = -1;
  51 struct psci_operations psci_ops;
  52 static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE;
  53
  54 bool psci_tos_resident_on(int cpu)
  55 {
  56         return cpu == resident_cpu;
  57 }
  58
  59 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
  60                                 unsigned long, unsigned long);
  61 static psci_fn *invoke_psci_fn;
  62
  63 static struct psci_0_1_function_ids psci_0_1_function_ids;
  64
  65 struct psci_0_1_function_ids get_psci_0_1_function_ids(void)
  66 {
  67         return psci_0_1_function_ids;
  68 }
  69
  70 #define PSCI_0_2_POWER_STATE_MASK               \
  71                                 (PSCI_0_2_POWER_STATE_ID_MASK | \
  72                                 PSCI_0_2_POWER_STATE_TYPE_MASK | \
  73                                 PSCI_0_2_POWER_STATE_AFFL_MASK)
  74
  75 #define PSCI_1_0_EXT_POWER_STATE_MASK           \
  76                                 (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
  77                                 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
  78
  79 static u32 psci_cpu_suspend_feature;
  80 static bool psci_system_reset2_supported;
  81 static bool psci_system_off2_hibernate_supported;
  82
  83 static inline bool psci_has_ext_power_state(void)
  84 {
  85         return psci_cpu_suspend_feature &
  86                                 PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
  87 }
  88
  89 bool psci_has_osi_support(void)
  90 {
  91         return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
  92 }
  93
  94 static inline bool psci_power_state_loses_context(u32 state)
  95 {
  96         const u32 mask = psci_has_ext_power_state() ?
  97                                         PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
  98                                         PSCI_0_2_POWER_STATE_TYPE_MASK;
  99
 100         return state & mask;
 101 }
 102
 103 bool psci_power_state_is_valid(u32 state)
 104 {
 105         const u32 valid_mask = psci_has_ext_power_state() ?
 106                                PSCI_1_0_EXT_POWER_STATE_MASK :
 107                                PSCI_0_2_POWER_STATE_MASK;
 108
 109         return !(state & ~valid_mask);
 110 }
 111
 112 static __always_inline unsigned long
 113 __invoke_psci_fn_hvc(unsigned long function_id,
 114                      unsigned long arg0, unsigned long arg1,
 115                      unsigned long arg2)
 116 {
 117         struct arm_smccc_res res;
 118
 119         arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
 120         return res.a0;
 121 }
 122
 123 static __always_inline unsigned long
 124 __invoke_psci_fn_smc(unsigned long function_id,
 125                      unsigned long arg0, unsigned long arg1,
 126                      unsigned long arg2)
 127 {
 128         struct arm_smccc_res res;
 129
 130         arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
 131         return res.a0;
 132 }
 133
 134 static __always_inline int psci_to_linux_errno(int errno)
 135 {
 136         switch (errno) {
 137         case PSCI_RET_SUCCESS:
 138                 return 0;
 139         case PSCI_RET_NOT_SUPPORTED:
 140                 return -EOPNOTSUPP;
 141         case PSCI_RET_INVALID_PARAMS:
 142         case PSCI_RET_INVALID_ADDRESS:
 143                 return -EINVAL;
 144         case PSCI_RET_DENIED:
 145                 return -EPERM;
 146         }
 147
 148         return -EINVAL;
 149 }
 150
 151 static u32 psci_0_1_get_version(void)
 152 {
 153         return PSCI_VERSION(0, 1);
 154 }
 155
 156 static u32 psci_0_2_get_version(void)
 157 {
 158         return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
 159 }
 160
 161 int psci_set_osi_mode(bool enable)
 162 {
 163         unsigned long suspend_mode;
 164         int err;
 165
 166         suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :
 167                         PSCI_1_0_SUSPEND_MODE_PC;
 168
 169         err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);
 170         if (err < 0)
 171                 pr_info(FW_BUG "failed to set %s mode: %d\n",
 172                                 enable ? "OSI" : "PC", err);
 173         return psci_to_linux_errno(err);
 174 }
 175
 176 static __always_inline int
 177 __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
 178 {
 179         int err;
 180
 181         err = invoke_psci_fn(fn, state, entry_point, 0);
 182         return psci_to_linux_errno(err);
 183 }
 184
 185 static __always_inline int
 186 psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
 187 {
 188         return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
 189                                   state, entry_point);
 190 }
 191
 192 static __always_inline int
 193 psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
 194 {
 195         return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
 196                                   state, entry_point);
 197 }
 198
 199 static int __psci_cpu_off(u32 fn, u32 state)
 200 {
 201         int err;
 202
 203         err = invoke_psci_fn(fn, state, 0, 0);
 204         return psci_to_linux_errno(err);
 205 }
 206
 207 static int psci_0_1_cpu_off(u32 state)
 208 {
 209         return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);
 210 }
 211
 212 static int psci_0_2_cpu_off(u32 state)
 213 {
 214         return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
 215 }
 216
 217 static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
 218 {
 219         int err;
 220
 221         err = invoke_psci_fn(fn, cpuid, entry_point, 0);
 222         return psci_to_linux_errno(err);
 223 }
 224
 225 static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
 226 {
 227         return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);
 228 }
 229
 230 static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
 231 {
 232         return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
 233 }
 234
 235 static int __psci_migrate(u32 fn, unsigned long cpuid)
 236 {
 237         int err;
 238
 239         err = invoke_psci_fn(fn, cpuid, 0, 0);
 240         return psci_to_linux_errno(err);
 241 }
 242
 243 static int psci_0_1_migrate(unsigned long cpuid)
 244 {
 245         return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);
 246 }
 247
 248 static int psci_0_2_migrate(unsigned long cpuid)
 249 {
 250         return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
 251 }
 252
 253 static int psci_affinity_info(unsigned long target_affinity,
 254                 unsigned long lowest_affinity_level)
 255 {
 256         return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
 257                               target_affinity, lowest_affinity_level, 0);
 258 }
 259
 260 static int psci_migrate_info_type(void)
 261 {
 262         return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
 263 }
 264
 265 static unsigned long psci_migrate_info_up_cpu(void)
 266 {
 267         return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
 268                               0, 0, 0);
 269 }
 270
 271 static void set_conduit(enum arm_smccc_conduit conduit)
 272 {
 273         switch (conduit) {
 274         case SMCCC_CONDUIT_HVC:
 275                 invoke_psci_fn = __invoke_psci_fn_hvc;
 276                 break;
 277         case SMCCC_CONDUIT_SMC:
 278                 invoke_psci_fn = __invoke_psci_fn_smc;
 279                 break;
 280         default:
 281                 WARN(1, "Unexpected PSCI conduit %d\n", conduit);
 282         }
 283
 284         psci_conduit = conduit;
 285 }
 286
 287 static int get_set_conduit_method(const struct device_node *np)
 288 {
 289         const char *method;
 290
 291         pr_info("probing for conduit method from DT.\n");
 292
 293         if (of_property_read_string(np, "method", &method)) {
 294                 pr_warn("missing \"method\" property\n");
 295                 return -ENXIO;
 296         }
 297
 298         if (!strcmp("hvc", method)) {
 299                 set_conduit(SMCCC_CONDUIT_HVC);
 300         } else if (!strcmp("smc", method)) {
 301                 set_conduit(SMCCC_CONDUIT_SMC);
 302         } else {
 303                 pr_warn("invalid \"method\" property: %s\n", method);
 304                 return -EINVAL;
 305         }
 306         return 0;
 307 }
 308
 309 static int psci_sys_reset(struct notifier_block *nb, unsigned long action,
 310                           void *data)
 311 {
 312         if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
 313             psci_system_reset2_supported) {
 314                 /*
 315                  * reset_type[31] = 0 (architectural)
 316                  * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
 317                  * cookie = 0 (ignored by the implementation)
 318                  */
 319                 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
 320         } else {
 321                 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
 322         }
 323
 324         return NOTIFY_DONE;
 325 }
 326
 327 static struct notifier_block psci_sys_reset_nb = {
 328         .notifier_call = psci_sys_reset,
 329         .priority = 129,
 330 };
 331
 332 static void psci_sys_poweroff(void)
 333 {
 334         invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
 335 }
 336
 337 #ifdef CONFIG_HIBERNATION
 338 static int psci_sys_hibernate(struct sys_off_data *data)
 339 {
 340         /*
 341          * If no hibernate type is specified SYSTEM_OFF2 defaults to selecting
 342          * HIBERNATE_OFF.
 343          *
 344          * There are hypervisors in the wild that do not align with the spec and
 345          * reject calls that explicitly provide a hibernate type. For
 346          * compatibility with these nonstandard implementations, pass 0 as the
 347          * type.
 348          */
 349         if (system_entering_hibernation())
 350                 invoke_psci_fn(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2), 0, 0, 0);
 351         return NOTIFY_DONE;
 352 }
 353
 354 static int __init psci_hibernate_init(void)
 355 {
 356         if (psci_system_off2_hibernate_supported) {
 357                 /* Higher priority than EFI shutdown, but only for hibernate */
 358                 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
 359                                          SYS_OFF_PRIO_FIRMWARE + 2,
 360                                          psci_sys_hibernate, NULL);
 361         }
 362         return 0;
 363 }
 364 subsys_initcall(psci_hibernate_init);
 365 #endif
 366
 367 static int psci_features(u32 psci_func_id)
 368 {
 369         return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
 370                               psci_func_id, 0, 0);
 371 }
 372
 373 #ifdef CONFIG_DEBUG_FS
 374
 375 #define PSCI_ID(ver, _name) \
 376         { .fn = PSCI_##ver##_FN_##_name, .name = #_name, }
 377 #define PSCI_ID_NATIVE(ver, _name) \
 378         { .fn = PSCI_FN_NATIVE(ver, _name), .name = #_name, }
 379
 380 /* A table of all optional functions */
 381 static const struct {
 382         u32 fn;
 383         const char *name;
 384 } psci_fn_ids[] = {
 385         PSCI_ID_NATIVE(0_2, MIGRATE),
 386         PSCI_ID(0_2, MIGRATE_INFO_TYPE),
 387         PSCI_ID_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
 388         PSCI_ID(1_0, CPU_FREEZE),
 389         PSCI_ID_NATIVE(1_0, CPU_DEFAULT_SUSPEND),
 390         PSCI_ID_NATIVE(1_0, NODE_HW_STATE),
 391         PSCI_ID_NATIVE(1_0, SYSTEM_SUSPEND),
 392         PSCI_ID(1_0, SET_SUSPEND_MODE),
 393         PSCI_ID_NATIVE(1_0, STAT_RESIDENCY),
 394         PSCI_ID_NATIVE(1_0, STAT_COUNT),
 395         PSCI_ID_NATIVE(1_1, SYSTEM_RESET2),
 396         PSCI_ID(1_1, MEM_PROTECT),
 397         PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE),
 398         PSCI_ID_NATIVE(1_3, SYSTEM_OFF2),
 399 };
 400
 401 static int psci_debugfs_read(struct seq_file *s, void *data)
 402 {
 403         int feature, type, i;
 404         u32 ver;
 405
 406         ver = psci_ops.get_version();
 407         seq_printf(s, "PSCIv%d.%d\n",
 408                    PSCI_VERSION_MAJOR(ver),
 409                    PSCI_VERSION_MINOR(ver));
 410
 411         /* PSCI_FEATURES is available only starting from 1.0 */
 412         if (PSCI_VERSION_MAJOR(ver) < 1)
 413                 return 0;
 414
 415         feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
 416         if (feature != PSCI_RET_NOT_SUPPORTED) {
 417                 ver = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
 418                 seq_printf(s, "SMC Calling Convention v%d.%d\n",
 419                            PSCI_VERSION_MAJOR(ver),
 420                            PSCI_VERSION_MINOR(ver));
 421         } else {
 422                 seq_puts(s, "SMC Calling Convention v1.0 is assumed\n");
 423         }
 424
 425         feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
 426         if (feature < 0) {
 427                 seq_printf(s, "PSCI_FEATURES(CPU_SUSPEND) error (%d)\n", feature);
 428         } else {
 429                 seq_printf(s, "OSI is %ssupported\n",
 430                            (feature & BIT(0)) ? "" : "not ");
 431                 seq_printf(s, "%s StateID format is used\n",
 432                            (feature & BIT(1)) ? "Extended" : "Original");
 433         }
 434
 435         type = psci_ops.migrate_info_type();
 436         if (type == PSCI_0_2_TOS_UP_MIGRATE ||
 437             type == PSCI_0_2_TOS_UP_NO_MIGRATE) {
 438                 unsigned long cpuid;
 439
 440                 seq_printf(s, "Trusted OS %smigrate capable\n",
 441                            type == PSCI_0_2_TOS_UP_NO_MIGRATE ? "not " : "");
 442                 cpuid = psci_migrate_info_up_cpu();
 443                 seq_printf(s, "Trusted OS resident on physical CPU 0x%lx (#%d)\n",
 444                            cpuid, resident_cpu);
 445         } else if (type == PSCI_0_2_TOS_MP) {
 446                 seq_puts(s, "Trusted OS migration not required\n");
 447         } else {
 448                 if (type != PSCI_RET_NOT_SUPPORTED)
 449                         seq_printf(s, "MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
 450         }
 451
 452         for (i = 0; i < ARRAY_SIZE(psci_fn_ids); i++) {
 453                 feature = psci_features(psci_fn_ids[i].fn);
 454                 if (feature == PSCI_RET_NOT_SUPPORTED)
 455                         continue;
 456                 if (feature < 0)
 457                         seq_printf(s, "PSCI_FEATURES(%s) error (%d)\n",
 458                                    psci_fn_ids[i].name, feature);
 459                 else
 460                         seq_printf(s, "%s is supported\n", psci_fn_ids[i].name);
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int psci_debugfs_open(struct inode *inode, struct file *f)
 467 {
 468         return single_open(f, psci_debugfs_read, NULL);
 469 }
 470
 471 static const struct file_operations psci_debugfs_ops = {
 472         .owner = THIS_MODULE,
 473         .open = psci_debugfs_open,
 474         .release = single_release,
 475         .read = seq_read,
 476         .llseek = seq_lseek
 477 };
 478
 479 static int __init psci_debugfs_init(void)
 480 {
 481         if (!invoke_psci_fn || !psci_ops.get_version)
 482                 return 0;
 483
 484         return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,
 485                                                    &psci_debugfs_ops));
 486 }
 487 late_initcall(psci_debugfs_init)
 488 #endif
 489
 490 #ifdef CONFIG_CPU_IDLE
 491 static noinstr int psci_suspend_finisher(unsigned long state)
 492 {
 493         u32 power_state = state;
 494         phys_addr_t pa_cpu_resume;
 495
 496         pa_cpu_resume = __pa_symbol_nodebug((unsigned long)cpu_resume);
 497
 498         return psci_ops.cpu_suspend(power_state, pa_cpu_resume);
 499 }
 500
 501 int psci_cpu_suspend_enter(u32 state)
 502 {
 503         int ret;
 504
 505         if (!psci_power_state_loses_context(state)) {
 506                 struct arm_cpuidle_irq_context context;
 507
 508                 ct_cpuidle_enter();
 509                 arm_cpuidle_save_irq_context(&context);
 510                 ret = psci_ops.cpu_suspend(state, 0);
 511                 arm_cpuidle_restore_irq_context(&context);
 512                 ct_cpuidle_exit();
 513         } else {
 514                 /*
 515                  * ARM64 cpu_suspend() wants to do ct_cpuidle_*() itself.
 516                  */
 517                 if (!IS_ENABLED(CONFIG_ARM64))
 518                         ct_cpuidle_enter();
 519
 520                 ret = cpu_suspend(state, psci_suspend_finisher);
 521
 522                 if (!IS_ENABLED(CONFIG_ARM64))
 523                         ct_cpuidle_exit();
 524         }
 525
 526         return ret;
 527 }
 528 #endif
 529
 530 static int psci_system_suspend(unsigned long unused)
 531 {
 532         int err;
 533         phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);
 534
 535         err = invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
 536                               pa_cpu_resume, 0, 0);
 537         return psci_to_linux_errno(err);
 538 }
 539
 540 static int psci_system_suspend_enter(suspend_state_t state)
 541 {
 542         return cpu_suspend(0, psci_system_suspend);
 543 }
 544
 545 static const struct platform_suspend_ops psci_suspend_ops = {
 546         .valid          = suspend_valid_only_mem,
 547         .enter          = psci_system_suspend_enter,
 548 };
 549
 550 static void __init psci_init_system_reset2(void)
 551 {
 552         int ret;
 553
 554         ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));
 555
 556         if (ret != PSCI_RET_NOT_SUPPORTED)
 557                 psci_system_reset2_supported = true;
 558 }
 559
 560 static void __init psci_init_system_off2(void)
 561 {
 562         int ret;
 563
 564         ret = psci_features(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2));
 565         if (ret < 0)
 566                 return;
 567
 568         if (ret & PSCI_1_3_OFF_TYPE_HIBERNATE_OFF)
 569                 psci_system_off2_hibernate_supported = true;
 570 }
 571
 572 static void __init psci_init_system_suspend(void)
 573 {
 574         int ret;
 575
 576         if (!IS_ENABLED(CONFIG_SUSPEND))
 577                 return;
 578
 579         ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
 580
 581         if (ret != PSCI_RET_NOT_SUPPORTED)
 582                 suspend_set_ops(&psci_suspend_ops);
 583 }
 584
 585 static void __init psci_init_cpu_suspend(void)
 586 {
 587         int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
 588
 589         if (feature != PSCI_RET_NOT_SUPPORTED)
 590                 psci_cpu_suspend_feature = feature;
 591 }
 592
 593 /*
 594  * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
 595  * return DENIED (which would be fatal).
 596  */
 597 static void __init psci_init_migrate(void)
 598 {
 599         unsigned long cpuid;
 600         int type, cpu = -1;
 601
 602         type = psci_ops.migrate_info_type();
 603
 604         if (type == PSCI_0_2_TOS_MP) {
 605                 pr_info("Trusted OS migration not required\n");
 606                 return;
 607         }
 608
 609         if (type == PSCI_RET_NOT_SUPPORTED) {
 610                 pr_info("MIGRATE_INFO_TYPE not supported.\n");
 611                 return;
 612         }
 613
 614         if (type != PSCI_0_2_TOS_UP_MIGRATE &&
 615             type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
 616                 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
 617                 return;
 618         }
 619
 620         cpuid = psci_migrate_info_up_cpu();
 621         if (cpuid & ~MPIDR_HWID_BITMASK) {
 622                 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
 623                         cpuid);
 624                 return;
 625         }
 626
 627         cpu = get_logical_index(cpuid);
 628         resident_cpu = cpu >= 0 ? cpu : -1;
 629
 630         pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
 631 }
 632
 633 static void __init psci_init_smccc(void)
 634 {
 635         u32 ver = ARM_SMCCC_VERSION_1_0;
 636         int feature;
 637
 638         feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
 639
 640         if (feature != PSCI_RET_NOT_SUPPORTED) {
 641                 u32 ret;
 642                 ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
 643                 if (ret >= ARM_SMCCC_VERSION_1_1) {
 644                         arm_smccc_version_init(ret, psci_conduit);
 645                         ver = ret;
 646                 }
 647         }
 648
 649         /*
 650          * Conveniently, the SMCCC and PSCI versions are encoded the
 651          * same way. No, this isn't accidental.
 652          */
 653         pr_info("SMC Calling Convention v%d.%d\n",
 654                 PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver));
 655
 656 }
 657
 658 static void __init psci_0_2_set_functions(void)
 659 {
 660         pr_info("Using standard PSCI v0.2 function IDs\n");
 661
 662         psci_ops = (struct psci_operations){
 663                 .get_version = psci_0_2_get_version,
 664                 .cpu_suspend = psci_0_2_cpu_suspend,
 665                 .cpu_off = psci_0_2_cpu_off,
 666                 .cpu_on = psci_0_2_cpu_on,
 667                 .migrate = psci_0_2_migrate,
 668                 .affinity_info = psci_affinity_info,
 669                 .migrate_info_type = psci_migrate_info_type,
 670         };
 671
 672         register_restart_handler(&psci_sys_reset_nb);
 673
 674         pm_power_off = psci_sys_poweroff;
 675 }
 676
 677 /*
 678  * Probe function for PSCI firmware versions >= 0.2
 679  */
 680 static int __init psci_probe(void)
 681 {
 682         u32 ver = psci_0_2_get_version();
 683
 684         pr_info("PSCIv%d.%d detected in firmware.\n",
 685                         PSCI_VERSION_MAJOR(ver),
 686                         PSCI_VERSION_MINOR(ver));
 687
 688         if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
 689                 pr_err("Conflicting PSCI version detected.\n");
 690                 return -EINVAL;
 691         }
 692
 693         psci_0_2_set_functions();
 694
 695         psci_init_migrate();
 696
 697         if (PSCI_VERSION_MAJOR(ver) >= 1) {
 698                 psci_init_smccc();
 699                 psci_init_cpu_suspend();
 700                 psci_init_system_suspend();
 701                 psci_init_system_reset2();
 702                 psci_init_system_off2();
 703                 kvm_init_hyp_services();
 704         }
 705
 706         return 0;
 707 }
 708
 709 typedef int (*psci_initcall_t)(const struct device_node *);
 710
 711 /*
 712  * PSCI init function for PSCI versions >=0.2
 713  *
 714  * Probe based on PSCI PSCI_VERSION function
 715  */
 716 static int __init psci_0_2_init(const struct device_node *np)
 717 {
 718         int err;
 719
 720         err = get_set_conduit_method(np);
 721         if (err)
 722                 return err;
 723
 724         /*
 725          * Starting with v0.2, the PSCI specification introduced a call
 726          * (PSCI_VERSION) that allows probing the firmware version, so
 727          * that PSCI function IDs and version specific initialization
 728          * can be carried out according to the specific version reported
 729          * by firmware
 730          */
 731         return psci_probe();
 732 }
 733
 734 /*
 735  * PSCI < v0.2 get PSCI Function IDs via DT.
 736  */
 737 static int __init psci_0_1_init(const struct device_node *np)
 738 {
 739         u32 id;
 740         int err;
 741
 742         err = get_set_conduit_method(np);
 743         if (err)
 744                 return err;
 745
 746         pr_info("Using PSCI v0.1 Function IDs from DT\n");
 747
 748         psci_ops.get_version = psci_0_1_get_version;
 749
 750         if (!of_property_read_u32(np, "cpu_suspend", &id)) {
 751                 psci_0_1_function_ids.cpu_suspend = id;
 752                 psci_ops.cpu_suspend = psci_0_1_cpu_suspend;
 753         }
 754
 755         if (!of_property_read_u32(np, "cpu_off", &id)) {
 756                 psci_0_1_function_ids.cpu_off = id;
 757                 psci_ops.cpu_off = psci_0_1_cpu_off;
 758         }
 759
 760         if (!of_property_read_u32(np, "cpu_on", &id)) {
 761                 psci_0_1_function_ids.cpu_on = id;
 762                 psci_ops.cpu_on = psci_0_1_cpu_on;
 763         }
 764
 765         if (!of_property_read_u32(np, "migrate", &id)) {
 766                 psci_0_1_function_ids.migrate = id;
 767                 psci_ops.migrate = psci_0_1_migrate;
 768         }
 769
 770         return 0;
 771 }
 772
 773 static int __init psci_1_0_init(const struct device_node *np)
 774 {
 775         int err;
 776
 777         err = psci_0_2_init(np);
 778         if (err)
 779                 return err;
 780
 781         if (psci_has_osi_support()) {
 782                 pr_info("OSI mode supported.\n");
 783
 784                 /* Default to PC mode. */
 785                 psci_set_osi_mode(false);
 786         }
 787
 788         return 0;
 789 }
 790
 791 static const struct of_device_id psci_of_match[] __initconst = {
 792         { .compatible = "arm,psci",     .data = psci_0_1_init},
 793         { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
 794         { .compatible = "arm,psci-1.0", .data = psci_1_0_init},
 795         {},
 796 };
 797
 798 int __init psci_dt_init(void)
 799 {
 800         struct device_node *np;
 801         const struct of_device_id *matched_np;
 802         psci_initcall_t init_fn;
 803         int ret;
 804
 805         np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
 806
 807         if (!np || !of_device_is_available(np))
 808                 return -ENODEV;
 809
 810         init_fn = (psci_initcall_t)matched_np->data;
 811         ret = init_fn(np);
 812
 813         of_node_put(np);
 814         return ret;
 815 }
 816
 817 #ifdef CONFIG_ACPI
 818 /*
 819  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
 820  * explicitly clarified in SBBR
 821  */
 822 int __init psci_acpi_init(void)
 823 {
 824         if (!acpi_psci_present()) {
 825                 pr_info("is not implemented in ACPI.\n");
 826                 return -EOPNOTSUPP;
 827         }
 828
 829         pr_info("probing for conduit method from ACPI.\n");
 830
 831         if (acpi_psci_use_hvc())
 832                 set_conduit(SMCCC_CONDUIT_HVC);
 833         else
 834                 set_conduit(SMCCC_CONDUIT_SMC);
 835
 836         return psci_probe();
 837 }
 838 #endif