drivers/base/arch_topology.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Arch specific cpu topology information
   4  *
   5  * Copyright (C) 2016, ARM Ltd.
   6  * Written by: Juri Lelli, ARM Ltd.
   7  */
   8
   9 #include <linux/acpi.h>
  10 #include <linux/cpu.h>
  11 #include <linux/cpufreq.h>
  12 #include <linux/device.h>
  13 #include <linux/of.h>
  14 #include <linux/slab.h>
  15 #include <linux/sched/topology.h>
  16 #include <linux/cpuset.h>
  17 #include <linux/cpumask.h>
  18 #include <linux/init.h>
  19 #include <linux/rcupdate.h>
  20 #include <linux/sched.h>
  21
  22 static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data);
  23 static struct cpumask scale_freq_counters_mask;
  24 static bool scale_freq_invariant;
  25 static DEFINE_PER_CPU(u32, freq_factor) = 1;
  26
  27 static bool supports_scale_freq_counters(const struct cpumask *cpus)
  28 {
  29         return cpumask_subset(cpus, &scale_freq_counters_mask);
  30 }
  31
  32 bool topology_scale_freq_invariant(void)
  33 {
  34         return cpufreq_supports_freq_invariance() ||
  35                supports_scale_freq_counters(cpu_online_mask);
  36 }
  37
  38 static void update_scale_freq_invariant(bool status)
  39 {
  40         if (scale_freq_invariant == status)
  41                 return;
  42
  43         /*
  44          * Task scheduler behavior depends on frequency invariance support,
  45          * either cpufreq or counter driven. If the support status changes as
  46          * a result of counter initialisation and use, retrigger the build of
  47          * scheduling domains to ensure the information is propagated properly.
  48          */
  49         if (topology_scale_freq_invariant() == status) {
  50                 scale_freq_invariant = status;
  51                 rebuild_sched_domains_energy();
  52         }
  53 }
  54
  55 void topology_set_scale_freq_source(struct scale_freq_data *data,
  56                                     const struct cpumask *cpus)
  57 {
  58         struct scale_freq_data *sfd;
  59         int cpu;
  60
  61         /*
  62          * Avoid calling rebuild_sched_domains() unnecessarily if FIE is
  63          * supported by cpufreq.
  64          */
  65         if (cpumask_empty(&scale_freq_counters_mask))
  66                 scale_freq_invariant = topology_scale_freq_invariant();
  67
  68         rcu_read_lock();
  69
  70         for_each_cpu(cpu, cpus) {
  71                 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
  72
  73                 /* Use ARCH provided counters whenever possible */
  74                 if (!sfd || sfd->source != SCALE_FREQ_SOURCE_ARCH) {
  75                         rcu_assign_pointer(per_cpu(sft_data, cpu), data);
  76                         cpumask_set_cpu(cpu, &scale_freq_counters_mask);
  77                 }
  78         }
  79
  80         rcu_read_unlock();
  81
  82         update_scale_freq_invariant(true);
  83 }
  84 EXPORT_SYMBOL_GPL(topology_set_scale_freq_source);
  85
  86 void topology_clear_scale_freq_source(enum scale_freq_source source,
  87                                       const struct cpumask *cpus)
  88 {
  89         struct scale_freq_data *sfd;
  90         int cpu;
  91
  92         rcu_read_lock();
  93
  94         for_each_cpu(cpu, cpus) {
  95                 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
  96
  97                 if (sfd && sfd->source == source) {
  98                         rcu_assign_pointer(per_cpu(sft_data, cpu), NULL);
  99                         cpumask_clear_cpu(cpu, &scale_freq_counters_mask);
 100                 }
 101         }
 102
 103         rcu_read_unlock();
 104
 105         /*
 106          * Make sure all references to previous sft_data are dropped to avoid
 107          * use-after-free races.
 108          */
 109         synchronize_rcu();
 110
 111         update_scale_freq_invariant(false);
 112 }
 113 EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source);
 114
 115 void topology_scale_freq_tick(void)
 116 {
 117         struct scale_freq_data *sfd = rcu_dereference_sched(*this_cpu_ptr(&sft_data));
 118
 119         if (sfd)
 120                 sfd->set_freq_scale();
 121 }
 122
 123 DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
 124 EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale);
 125
 126 void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
 127                              unsigned long max_freq)
 128 {
 129         unsigned long scale;
 130         int i;
 131
 132         if (WARN_ON_ONCE(!cur_freq || !max_freq))
 133                 return;
 134
 135         /*
 136          * If the use of counters for FIE is enabled, just return as we don't
 137          * want to update the scale factor with information from CPUFREQ.
 138          * Instead the scale factor will be updated from arch_scale_freq_tick.
 139          */
 140         if (supports_scale_freq_counters(cpus))
 141                 return;
 142
 143         scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;
 144
 145         for_each_cpu(i, cpus)
 146                 per_cpu(arch_freq_scale, i) = scale;
 147 }
 148
 149 DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
 150 EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale);
 151
 152 void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
 153 {
 154         per_cpu(cpu_scale, cpu) = capacity;
 155 }
 156
 157 DEFINE_PER_CPU(unsigned long, thermal_pressure);
 158
 159 /**
 160  * topology_update_thermal_pressure() - Update thermal pressure for CPUs
 161  * @cpus        : The related CPUs for which capacity has been reduced
 162  * @capped_freq : The maximum allowed frequency that CPUs can run at
 163  *
 164  * Update the value of thermal pressure for all @cpus in the mask. The
 165  * cpumask should include all (online+offline) affected CPUs, to avoid
 166  * operating on stale data when hot-plug is used for some CPUs. The
 167  * @capped_freq reflects the currently allowed max CPUs frequency due to
 168  * thermal capping. It might be also a boost frequency value, which is bigger
 169  * than the internal 'freq_factor' max frequency. In such case the pressure
 170  * value should simply be removed, since this is an indication that there is
 171  * no thermal throttling. The @capped_freq must be provided in kHz.
 172  */
 173 void topology_update_thermal_pressure(const struct cpumask *cpus,
 174                                       unsigned long capped_freq)
 175 {
 176         unsigned long max_capacity, capacity, th_pressure;
 177         u32 max_freq;
 178         int cpu;
 179
 180         cpu = cpumask_first(cpus);
 181         max_capacity = arch_scale_cpu_capacity(cpu);
 182         max_freq = per_cpu(freq_factor, cpu);
 183
 184         /* Convert to MHz scale which is used in 'freq_factor' */
 185         capped_freq /= 1000;
 186
 187         /*
 188          * Handle properly the boost frequencies, which should simply clean
 189          * the thermal pressure value.
 190          */
 191         if (max_freq <= capped_freq)
 192                 capacity = max_capacity;
 193         else
 194                 capacity = mult_frac(max_capacity, capped_freq, max_freq);
 195
 196         th_pressure = max_capacity - capacity;
 197
 198         for_each_cpu(cpu, cpus)
 199                 WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure);
 200 }
 201 EXPORT_SYMBOL_GPL(topology_update_thermal_pressure);
 202
 203 static ssize_t cpu_capacity_show(struct device *dev,
 204                                  struct device_attribute *attr,
 205                                  char *buf)
 206 {
 207         struct cpu *cpu = container_of(dev, struct cpu, dev);
 208
 209         return sysfs_emit(buf, "%lu\n", topology_get_cpu_scale(cpu->dev.id));
 210 }
 211
 212 static void update_topology_flags_workfn(struct work_struct *work);
 213 static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn);
 214
 215 static DEVICE_ATTR_RO(cpu_capacity);
 216
 217 static int register_cpu_capacity_sysctl(void)
 218 {
 219         int i;
 220         struct device *cpu;
 221
 222         for_each_possible_cpu(i) {
 223                 cpu = get_cpu_device(i);
 224                 if (!cpu) {
 225                         pr_err("%s: too early to get CPU%d device!\n",
 226                                __func__, i);
 227                         continue;
 228                 }
 229                 device_create_file(cpu, &dev_attr_cpu_capacity);
 230         }
 231
 232         return 0;
 233 }
 234 subsys_initcall(register_cpu_capacity_sysctl);
 235
 236 static int update_topology;
 237
 238 int topology_update_cpu_topology(void)
 239 {
 240         return update_topology;
 241 }
 242
 243 /*
 244  * Updating the sched_domains can't be done directly from cpufreq callbacks
 245  * due to locking, so queue the work for later.
 246  */
 247 static void update_topology_flags_workfn(struct work_struct *work)
 248 {
 249         update_topology = 1;
 250         rebuild_sched_domains();
 251         pr_debug("sched_domain hierarchy rebuilt, flags updated\n");
 252         update_topology = 0;
 253 }
 254
 255 static u32 *raw_capacity;
 256
 257 static int free_raw_capacity(void)
 258 {
 259         kfree(raw_capacity);
 260         raw_capacity = NULL;
 261
 262         return 0;
 263 }
 264
 265 void topology_normalize_cpu_scale(void)
 266 {
 267         u64 capacity;
 268         u64 capacity_scale;
 269         int cpu;
 270
 271         if (!raw_capacity)
 272                 return;
 273
 274         capacity_scale = 1;
 275         for_each_possible_cpu(cpu) {
 276                 capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
 277                 capacity_scale = max(capacity, capacity_scale);
 278         }
 279
 280         pr_debug("cpu_capacity: capacity_scale=%llu\n", capacity_scale);
 281         for_each_possible_cpu(cpu) {
 282                 capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
 283                 capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT,
 284                         capacity_scale);
 285                 topology_set_cpu_scale(cpu, capacity);
 286                 pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
 287                         cpu, topology_get_cpu_scale(cpu));
 288         }
 289 }
 290
 291 bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
 292 {
 293         struct clk *cpu_clk;
 294         static bool cap_parsing_failed;
 295         int ret;
 296         u32 cpu_capacity;
 297
 298         if (cap_parsing_failed)
 299                 return false;
 300
 301         ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",
 302                                    &cpu_capacity);
 303         if (!ret) {
 304                 if (!raw_capacity) {
 305                         raw_capacity = kcalloc(num_possible_cpus(),
 306                                                sizeof(*raw_capacity),
 307                                                GFP_KERNEL);
 308                         if (!raw_capacity) {
 309                                 cap_parsing_failed = true;
 310                                 return false;
 311                         }
 312                 }
 313                 raw_capacity[cpu] = cpu_capacity;
 314                 pr_debug("cpu_capacity: %pOF cpu_capacity=%u (raw)\n",
 315                         cpu_node, raw_capacity[cpu]);
 316
 317                 /*
 318                  * Update freq_factor for calculating early boot cpu capacities.
 319                  * For non-clk CPU DVFS mechanism, there's no way to get the
 320                  * frequency value now, assuming they are running at the same
 321                  * frequency (by keeping the initial freq_factor value).
 322                  */
 323                 cpu_clk = of_clk_get(cpu_node, 0);
 324                 if (!PTR_ERR_OR_ZERO(cpu_clk)) {
 325                         per_cpu(freq_factor, cpu) =
 326                                 clk_get_rate(cpu_clk) / 1000;
 327                         clk_put(cpu_clk);
 328                 }
 329         } else {
 330                 if (raw_capacity) {
 331                         pr_err("cpu_capacity: missing %pOF raw capacity\n",
 332                                 cpu_node);
 333                         pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
 334                 }
 335                 cap_parsing_failed = true;
 336                 free_raw_capacity();
 337         }
 338
 339         return !ret;
 340 }
 341
 342 #ifdef CONFIG_ACPI_CPPC_LIB
 343 #include <acpi/cppc_acpi.h>
 344
 345 void topology_init_cpu_capacity_cppc(void)
 346 {
 347         struct cppc_perf_caps perf_caps;
 348         int cpu;
 349
 350         if (likely(acpi_disabled || !acpi_cpc_valid()))
 351                 return;
 352
 353         raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity),
 354                                GFP_KERNEL);
 355         if (!raw_capacity)
 356                 return;
 357
 358         for_each_possible_cpu(cpu) {
 359                 if (!cppc_get_perf_caps(cpu, &perf_caps) &&
 360                     (perf_caps.highest_perf >= perf_caps.nominal_perf) &&
 361                     (perf_caps.highest_perf >= perf_caps.lowest_perf)) {
 362                         raw_capacity[cpu] = perf_caps.highest_perf;
 363                         pr_debug("cpu_capacity: CPU%d cpu_capacity=%u (raw).\n",
 364                                  cpu, raw_capacity[cpu]);
 365                         continue;
 366                 }
 367
 368                 pr_err("cpu_capacity: CPU%d missing/invalid highest performance.\n", cpu);
 369                 pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
 370                 goto exit;
 371         }
 372
 373         topology_normalize_cpu_scale();
 374         schedule_work(&update_topology_flags_work);
 375         pr_debug("cpu_capacity: cpu_capacity initialization done\n");
 376
 377 exit:
 378         free_raw_capacity();
 379 }
 380 #endif
 381
 382 #ifdef CONFIG_CPU_FREQ
 383 static cpumask_var_t cpus_to_visit;
 384 static void parsing_done_workfn(struct work_struct *work);
 385 static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
 386
 387 static int
 388 init_cpu_capacity_callback(struct notifier_block *nb,
 389                            unsigned long val,
 390                            void *data)
 391 {
 392         struct cpufreq_policy *policy = data;
 393         int cpu;
 394
 395         if (!raw_capacity)
 396                 return 0;
 397
 398         if (val != CPUFREQ_CREATE_POLICY)
 399                 return 0;
 400
 401         pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
 402                  cpumask_pr_args(policy->related_cpus),
 403                  cpumask_pr_args(cpus_to_visit));
 404
 405         cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);
 406
 407         for_each_cpu(cpu, policy->related_cpus)
 408                 per_cpu(freq_factor, cpu) = policy->cpuinfo.max_freq / 1000;
 409
 410         if (cpumask_empty(cpus_to_visit)) {
 411                 topology_normalize_cpu_scale();
 412                 schedule_work(&update_topology_flags_work);
 413                 free_raw_capacity();
 414                 pr_debug("cpu_capacity: parsing done\n");
 415                 schedule_work(&parsing_done_work);
 416         }
 417
 418         return 0;
 419 }
 420
 421 static struct notifier_block init_cpu_capacity_notifier = {
 422         .notifier_call = init_cpu_capacity_callback,
 423 };
 424
 425 static int __init register_cpufreq_notifier(void)
 426 {
 427         int ret;
 428
 429         /*
 430          * On ACPI-based systems skip registering cpufreq notifier as cpufreq
 431          * information is not needed for cpu capacity initialization.
 432          */
 433         if (!acpi_disabled || !raw_capacity)
 434                 return -EINVAL;
 435
 436         if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL))
 437                 return -ENOMEM;
 438
 439         cpumask_copy(cpus_to_visit, cpu_possible_mask);
 440
 441         ret = cpufreq_register_notifier(&init_cpu_capacity_notifier,
 442                                         CPUFREQ_POLICY_NOTIFIER);
 443
 444         if (ret)
 445                 free_cpumask_var(cpus_to_visit);
 446
 447         return ret;
 448 }
 449 core_initcall(register_cpufreq_notifier);
 450
 451 static void parsing_done_workfn(struct work_struct *work)
 452 {
 453         cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
 454                                          CPUFREQ_POLICY_NOTIFIER);
 455         free_cpumask_var(cpus_to_visit);
 456 }
 457
 458 #else
 459 core_initcall(free_raw_capacity);
 460 #endif
 461
 462 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 463 /*
 464  * This function returns the logic cpu number of the node.
 465  * There are basically three kinds of return values:
 466  * (1) logic cpu number which is > 0.
 467  * (2) -ENODEV when the device tree(DT) node is valid and found in the DT but
 468  * there is no possible logical CPU in the kernel to match. This happens
 469  * when CONFIG_NR_CPUS is configure to be smaller than the number of
 470  * CPU nodes in DT. We need to just ignore this case.
 471  * (3) -1 if the node does not exist in the device tree
 472  */
 473 static int __init get_cpu_for_node(struct device_node *node)
 474 {
 475         struct device_node *cpu_node;
 476         int cpu;
 477
 478         cpu_node = of_parse_phandle(node, "cpu", 0);
 479         if (!cpu_node)
 480                 return -1;
 481
 482         cpu = of_cpu_node_to_id(cpu_node);
 483         if (cpu >= 0)
 484                 topology_parse_cpu_capacity(cpu_node, cpu);
 485         else
 486                 pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n",
 487                         cpu_node, cpumask_pr_args(cpu_possible_mask));
 488
 489         of_node_put(cpu_node);
 490         return cpu;
 491 }
 492
 493 static int __init parse_core(struct device_node *core, int package_id,
 494                              int core_id)
 495 {
 496         char name[20];
 497         bool leaf = true;
 498         int i = 0;
 499         int cpu;
 500         struct device_node *t;
 501
 502         do {
 503                 snprintf(name, sizeof(name), "thread%d", i);
 504                 t = of_get_child_by_name(core, name);
 505                 if (t) {
 506                         leaf = false;
 507                         cpu = get_cpu_for_node(t);
 508                         if (cpu >= 0) {
 509                                 cpu_topology[cpu].package_id = package_id;
 510                                 cpu_topology[cpu].core_id = core_id;
 511                                 cpu_topology[cpu].thread_id = i;
 512                         } else if (cpu != -ENODEV) {
 513                                 pr_err("%pOF: Can't get CPU for thread\n", t);
 514                                 of_node_put(t);
 515                                 return -EINVAL;
 516                         }
 517                         of_node_put(t);
 518                 }
 519                 i++;
 520         } while (t);
 521
 522         cpu = get_cpu_for_node(core);
 523         if (cpu >= 0) {
 524                 if (!leaf) {
 525                         pr_err("%pOF: Core has both threads and CPU\n",
 526                                core);
 527                         return -EINVAL;
 528                 }
 529
 530                 cpu_topology[cpu].package_id = package_id;
 531                 cpu_topology[cpu].core_id = core_id;
 532         } else if (leaf && cpu != -ENODEV) {
 533                 pr_err("%pOF: Can't get CPU for leaf core\n", core);
 534                 return -EINVAL;
 535         }
 536
 537         return 0;
 538 }
 539
 540 static int __init parse_cluster(struct device_node *cluster, int depth)
 541 {
 542         char name[20];
 543         bool leaf = true;
 544         bool has_cores = false;
 545         struct device_node *c;
 546         static int package_id __initdata;
 547         int core_id = 0;
 548         int i, ret;
 549
 550         /*
 551          * First check for child clusters; we currently ignore any
 552          * information about the nesting of clusters and present the
 553          * scheduler with a flat list of them.
 554          */
 555         i = 0;
 556         do {
 557                 snprintf(name, sizeof(name), "cluster%d", i);
 558                 c = of_get_child_by_name(cluster, name);
 559                 if (c) {
 560                         leaf = false;
 561                         ret = parse_cluster(c, depth + 1);
 562                         of_node_put(c);
 563                         if (ret != 0)
 564                                 return ret;
 565                 }
 566                 i++;
 567         } while (c);
 568
 569         /* Now check for cores */
 570         i = 0;
 571         do {
 572                 snprintf(name, sizeof(name), "core%d", i);
 573                 c = of_get_child_by_name(cluster, name);
 574                 if (c) {
 575                         has_cores = true;
 576
 577                         if (depth == 0) {
 578                                 pr_err("%pOF: cpu-map children should be clusters\n",
 579                                        c);
 580                                 of_node_put(c);
 581                                 return -EINVAL;
 582                         }
 583
 584                         if (leaf) {
 585                                 ret = parse_core(c, package_id, core_id++);
 586                         } else {
 587                                 pr_err("%pOF: Non-leaf cluster with core %s\n",
 588                                        cluster, name);
 589                                 ret = -EINVAL;
 590                         }
 591
 592                         of_node_put(c);
 593                         if (ret != 0)
 594                                 return ret;
 595                 }
 596                 i++;
 597         } while (c);
 598
 599         if (leaf && !has_cores)
 600                 pr_warn("%pOF: empty cluster\n", cluster);
 601
 602         if (leaf)
 603                 package_id++;
 604
 605         return 0;
 606 }
 607
 608 static int __init parse_dt_topology(void)
 609 {
 610         struct device_node *cn, *map;
 611         int ret = 0;
 612         int cpu;
 613
 614         cn = of_find_node_by_path("/cpus");
 615         if (!cn) {
 616                 pr_err("No CPU information found in DT\n");
 617                 return 0;
 618         }
 619
 620         /*
 621          * When topology is provided cpu-map is essentially a root
 622          * cluster with restricted subnodes.
 623          */
 624         map = of_get_child_by_name(cn, "cpu-map");
 625         if (!map)
 626                 goto out;
 627
 628         ret = parse_cluster(map, 0);
 629         if (ret != 0)
 630                 goto out_map;
 631
 632         topology_normalize_cpu_scale();
 633
 634         /*
 635          * Check that all cores are in the topology; the SMP code will
 636          * only mark cores described in the DT as possible.
 637          */
 638         for_each_possible_cpu(cpu)
 639                 if (cpu_topology[cpu].package_id == -1)
 640                         ret = -EINVAL;
 641
 642 out_map:
 643         of_node_put(map);
 644 out:
 645         of_node_put(cn);
 646         return ret;
 647 }
 648 #endif
 649
 650 /*
 651  * cpu topology table
 652  */
 653 struct cpu_topology cpu_topology[NR_CPUS];
 654 EXPORT_SYMBOL_GPL(cpu_topology);
 655
 656 const struct cpumask *cpu_coregroup_mask(int cpu)
 657 {
 658         const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
 659
 660         /* Find the smaller of NUMA, core or LLC siblings */
 661         if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
 662                 /* not numa in package, lets use the package siblings */
 663                 core_mask = &cpu_topology[cpu].core_sibling;
 664         }
 665         if (cpu_topology[cpu].llc_id != -1) {
 666                 if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
 667                         core_mask = &cpu_topology[cpu].llc_sibling;
 668         }
 669
 670         return core_mask;
 671 }
 672
 673 const struct cpumask *cpu_clustergroup_mask(int cpu)
 674 {
 675         return &cpu_topology[cpu].cluster_sibling;
 676 }
 677
 678 void update_siblings_masks(unsigned int cpuid)
 679 {
 680         struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
 681         int cpu;
 682
 683         /* update core and thread sibling masks */
 684         for_each_online_cpu(cpu) {
 685                 cpu_topo = &cpu_topology[cpu];
 686
 687                 if (cpuid_topo->llc_id == cpu_topo->llc_id) {
 688                         cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
 689                         cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
 690                 }
 691
 692                 if (cpuid_topo->package_id != cpu_topo->package_id)
 693                         continue;
 694
 695                 if (cpuid_topo->cluster_id == cpu_topo->cluster_id &&
 696                     cpuid_topo->cluster_id != -1) {
 697                         cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling);
 698                         cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling);
 699                 }
 700
 701                 cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
 702                 cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
 703
 704                 if (cpuid_topo->core_id != cpu_topo->core_id)
 705                         continue;
 706
 707                 cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
 708                 cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
 709         }
 710 }
 711
 712 static void clear_cpu_topology(int cpu)
 713 {
 714         struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 715
 716         cpumask_clear(&cpu_topo->llc_sibling);
 717         cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
 718
 719         cpumask_clear(&cpu_topo->cluster_sibling);
 720         cpumask_set_cpu(cpu, &cpu_topo->cluster_sibling);
 721
 722         cpumask_clear(&cpu_topo->core_sibling);
 723         cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
 724         cpumask_clear(&cpu_topo->thread_sibling);
 725         cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
 726 }
 727
 728 void __init reset_cpu_topology(void)
 729 {
 730         unsigned int cpu;
 731
 732         for_each_possible_cpu(cpu) {
 733                 struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 734
 735                 cpu_topo->thread_id = -1;
 736                 cpu_topo->core_id = -1;
 737                 cpu_topo->cluster_id = -1;
 738                 cpu_topo->package_id = -1;
 739                 cpu_topo->llc_id = -1;
 740
 741                 clear_cpu_topology(cpu);
 742         }
 743 }
 744
 745 void remove_cpu_topology(unsigned int cpu)
 746 {
 747         int sibling;
 748
 749         for_each_cpu(sibling, topology_core_cpumask(cpu))
 750                 cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
 751         for_each_cpu(sibling, topology_sibling_cpumask(cpu))
 752                 cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
 753         for_each_cpu(sibling, topology_cluster_cpumask(cpu))
 754                 cpumask_clear_cpu(cpu, topology_cluster_cpumask(sibling));
 755         for_each_cpu(sibling, topology_llc_cpumask(cpu))
 756                 cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
 757
 758         clear_cpu_topology(cpu);
 759 }
 760
 761 __weak int __init parse_acpi_topology(void)
 762 {
 763         return 0;
 764 }
 765
 766 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 767 void __init init_cpu_topology(void)
 768 {
 769         reset_cpu_topology();
 770
 771         /*
 772          * Discard anything that was parsed if we hit an error so we
 773          * don't use partial information.
 774          */
 775         if (parse_acpi_topology())
 776                 reset_cpu_topology();
 777         else if (of_have_populated_dt() && parse_dt_topology())
 778                 reset_cpu_topology();
 779 }
 780 #endif