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/cacheinfo.h>
  11 #include <linux/cpu.h>
  12 #include <linux/cpufreq.h>
  13 #include <linux/device.h>
  14 #include <linux/of.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched/topology.h>
  17 #include <linux/cpuset.h>
  18 #include <linux/cpumask.h>
  19 #include <linux/init.h>
  20 #include <linux/rcupdate.h>
  21 #include <linux/sched.h>
  22 #include <linux/units.h>
  23
  24 #define CREATE_TRACE_POINTS
  25 #include <trace/events/hw_pressure.h>
  26
  27 static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data);
  28 static struct cpumask scale_freq_counters_mask;
  29 static bool scale_freq_invariant;
  30 DEFINE_PER_CPU(unsigned long, capacity_freq_ref) = 1;
  31 EXPORT_PER_CPU_SYMBOL_GPL(capacity_freq_ref);
  32
  33 static bool supports_scale_freq_counters(const struct cpumask *cpus)
  34 {
  35         return cpumask_subset(cpus, &scale_freq_counters_mask);
  36 }
  37
  38 bool topology_scale_freq_invariant(void)
  39 {
  40         return cpufreq_supports_freq_invariance() ||
  41                supports_scale_freq_counters(cpu_online_mask);
  42 }
  43
  44 static void update_scale_freq_invariant(bool status)
  45 {
  46         if (scale_freq_invariant == status)
  47                 return;
  48
  49         /*
  50          * Task scheduler behavior depends on frequency invariance support,
  51          * either cpufreq or counter driven. If the support status changes as
  52          * a result of counter initialisation and use, retrigger the build of
  53          * scheduling domains to ensure the information is propagated properly.
  54          */
  55         if (topology_scale_freq_invariant() == status) {
  56                 scale_freq_invariant = status;
  57                 rebuild_sched_domains_energy();
  58         }
  59 }
  60
  61 void topology_set_scale_freq_source(struct scale_freq_data *data,
  62                                     const struct cpumask *cpus)
  63 {
  64         struct scale_freq_data *sfd;
  65         int cpu;
  66
  67         /*
  68          * Avoid calling rebuild_sched_domains() unnecessarily if FIE is
  69          * supported by cpufreq.
  70          */
  71         if (cpumask_empty(&scale_freq_counters_mask))
  72                 scale_freq_invariant = topology_scale_freq_invariant();
  73
  74         rcu_read_lock();
  75
  76         for_each_cpu(cpu, cpus) {
  77                 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
  78
  79                 /* Use ARCH provided counters whenever possible */
  80                 if (!sfd || sfd->source != SCALE_FREQ_SOURCE_ARCH) {
  81                         rcu_assign_pointer(per_cpu(sft_data, cpu), data);
  82                         cpumask_set_cpu(cpu, &scale_freq_counters_mask);
  83                 }
  84         }
  85
  86         rcu_read_unlock();
  87
  88         update_scale_freq_invariant(true);
  89 }
  90 EXPORT_SYMBOL_GPL(topology_set_scale_freq_source);
  91
  92 void topology_clear_scale_freq_source(enum scale_freq_source source,
  93                                       const struct cpumask *cpus)
  94 {
  95         struct scale_freq_data *sfd;
  96         int cpu;
  97
  98         rcu_read_lock();
  99
 100         for_each_cpu(cpu, cpus) {
 101                 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
 102
 103                 if (sfd && sfd->source == source) {
 104                         rcu_assign_pointer(per_cpu(sft_data, cpu), NULL);
 105                         cpumask_clear_cpu(cpu, &scale_freq_counters_mask);
 106                 }
 107         }
 108
 109         rcu_read_unlock();
 110
 111         /*
 112          * Make sure all references to previous sft_data are dropped to avoid
 113          * use-after-free races.
 114          */
 115         synchronize_rcu();
 116
 117         update_scale_freq_invariant(false);
 118 }
 119 EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source);
 120
 121 void topology_scale_freq_tick(void)
 122 {
 123         struct scale_freq_data *sfd = rcu_dereference_sched(*this_cpu_ptr(&sft_data));
 124
 125         if (sfd)
 126                 sfd->set_freq_scale();
 127 }
 128
 129 DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
 130 EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale);
 131
 132 void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
 133                              unsigned long max_freq)
 134 {
 135         unsigned long scale;
 136         int i;
 137
 138         if (WARN_ON_ONCE(!cur_freq || !max_freq))
 139                 return;
 140
 141         /*
 142          * If the use of counters for FIE is enabled, just return as we don't
 143          * want to update the scale factor with information from CPUFREQ.
 144          * Instead the scale factor will be updated from arch_scale_freq_tick.
 145          */
 146         if (supports_scale_freq_counters(cpus))
 147                 return;
 148
 149         scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;
 150
 151         for_each_cpu(i, cpus)
 152                 per_cpu(arch_freq_scale, i) = scale;
 153 }
 154
 155 DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
 156 EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale);
 157
 158 void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
 159 {
 160         per_cpu(cpu_scale, cpu) = capacity;
 161 }
 162
 163 DEFINE_PER_CPU(unsigned long, hw_pressure);
 164
 165 /**
 166  * topology_update_hw_pressure() - Update HW pressure for CPUs
 167  * @cpus        : The related CPUs for which capacity has been reduced
 168  * @capped_freq : The maximum allowed frequency that CPUs can run at
 169  *
 170  * Update the value of HW pressure for all @cpus in the mask. The
 171  * cpumask should include all (online+offline) affected CPUs, to avoid
 172  * operating on stale data when hot-plug is used for some CPUs. The
 173  * @capped_freq reflects the currently allowed max CPUs frequency due to
 174  * HW capping. It might be also a boost frequency value, which is bigger
 175  * than the internal 'capacity_freq_ref' max frequency. In such case the
 176  * pressure value should simply be removed, since this is an indication that
 177  * there is no HW throttling. The @capped_freq must be provided in kHz.
 178  */
 179 void topology_update_hw_pressure(const struct cpumask *cpus,
 180                                       unsigned long capped_freq)
 181 {
 182         unsigned long max_capacity, capacity, pressure;
 183         u32 max_freq;
 184         int cpu;
 185
 186         cpu = cpumask_first(cpus);
 187         max_capacity = arch_scale_cpu_capacity(cpu);
 188         max_freq = arch_scale_freq_ref(cpu);
 189
 190         /*
 191          * Handle properly the boost frequencies, which should simply clean
 192          * the HW pressure value.
 193          */
 194         if (max_freq <= capped_freq)
 195                 capacity = max_capacity;
 196         else
 197                 capacity = mult_frac(max_capacity, capped_freq, max_freq);
 198
 199         pressure = max_capacity - capacity;
 200
 201         trace_hw_pressure_update(cpu, pressure);
 202
 203         for_each_cpu(cpu, cpus)
 204                 WRITE_ONCE(per_cpu(hw_pressure, cpu), pressure);
 205 }
 206 EXPORT_SYMBOL_GPL(topology_update_hw_pressure);
 207
 208 static ssize_t cpu_capacity_show(struct device *dev,
 209                                  struct device_attribute *attr,
 210                                  char *buf)
 211 {
 212         struct cpu *cpu = container_of(dev, struct cpu, dev);
 213
 214         return sysfs_emit(buf, "%lu\n", topology_get_cpu_scale(cpu->dev.id));
 215 }
 216
 217 static void update_topology_flags_workfn(struct work_struct *work);
 218 static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn);
 219
 220 static DEVICE_ATTR_RO(cpu_capacity);
 221
 222 static int cpu_capacity_sysctl_add(unsigned int cpu)
 223 {
 224         struct device *cpu_dev = get_cpu_device(cpu);
 225
 226         if (!cpu_dev)
 227                 return -ENOENT;
 228
 229         device_create_file(cpu_dev, &dev_attr_cpu_capacity);
 230
 231         return 0;
 232 }
 233
 234 static int cpu_capacity_sysctl_remove(unsigned int cpu)
 235 {
 236         struct device *cpu_dev = get_cpu_device(cpu);
 237
 238         if (!cpu_dev)
 239                 return -ENOENT;
 240
 241         device_remove_file(cpu_dev, &dev_attr_cpu_capacity);
 242
 243         return 0;
 244 }
 245
 246 static int register_cpu_capacity_sysctl(void)
 247 {
 248         cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "topology/cpu-capacity",
 249                           cpu_capacity_sysctl_add, cpu_capacity_sysctl_remove);
 250
 251         return 0;
 252 }
 253 subsys_initcall(register_cpu_capacity_sysctl);
 254
 255 static int update_topology;
 256
 257 int topology_update_cpu_topology(void)
 258 {
 259         return update_topology;
 260 }
 261
 262 /*
 263  * Updating the sched_domains can't be done directly from cpufreq callbacks
 264  * due to locking, so queue the work for later.
 265  */
 266 static void update_topology_flags_workfn(struct work_struct *work)
 267 {
 268         update_topology = 1;
 269         rebuild_sched_domains();
 270         pr_debug("sched_domain hierarchy rebuilt, flags updated\n");
 271         update_topology = 0;
 272 }
 273
 274 static u32 *raw_capacity;
 275
 276 static int free_raw_capacity(void)
 277 {
 278         kfree(raw_capacity);
 279         raw_capacity = NULL;
 280
 281         return 0;
 282 }
 283
 284 void topology_normalize_cpu_scale(void)
 285 {
 286         u64 capacity;
 287         u64 capacity_scale;
 288         int cpu;
 289
 290         if (!raw_capacity)
 291                 return;
 292
 293         capacity_scale = 1;
 294         for_each_possible_cpu(cpu) {
 295                 capacity = raw_capacity[cpu] * per_cpu(capacity_freq_ref, cpu);
 296                 capacity_scale = max(capacity, capacity_scale);
 297         }
 298
 299         pr_debug("cpu_capacity: capacity_scale=%llu\n", capacity_scale);
 300         for_each_possible_cpu(cpu) {
 301                 capacity = raw_capacity[cpu] * per_cpu(capacity_freq_ref, cpu);
 302                 capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT,
 303                         capacity_scale);
 304                 topology_set_cpu_scale(cpu, capacity);
 305                 pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
 306                         cpu, topology_get_cpu_scale(cpu));
 307         }
 308 }
 309
 310 bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
 311 {
 312         struct clk *cpu_clk;
 313         static bool cap_parsing_failed;
 314         int ret;
 315         u32 cpu_capacity;
 316
 317         if (cap_parsing_failed)
 318                 return false;
 319
 320         ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",
 321                                    &cpu_capacity);
 322         if (!ret) {
 323                 if (!raw_capacity) {
 324                         raw_capacity = kcalloc(num_possible_cpus(),
 325                                                sizeof(*raw_capacity),
 326                                                GFP_KERNEL);
 327                         if (!raw_capacity) {
 328                                 cap_parsing_failed = true;
 329                                 return false;
 330                         }
 331                 }
 332                 raw_capacity[cpu] = cpu_capacity;
 333                 pr_debug("cpu_capacity: %pOF cpu_capacity=%u (raw)\n",
 334                         cpu_node, raw_capacity[cpu]);
 335
 336                 /*
 337                  * Update capacity_freq_ref for calculating early boot CPU capacities.
 338                  * For non-clk CPU DVFS mechanism, there's no way to get the
 339                  * frequency value now, assuming they are running at the same
 340                  * frequency (by keeping the initial capacity_freq_ref value).
 341                  */
 342                 cpu_clk = of_clk_get(cpu_node, 0);
 343                 if (!PTR_ERR_OR_ZERO(cpu_clk)) {
 344                         per_cpu(capacity_freq_ref, cpu) =
 345                                 clk_get_rate(cpu_clk) / HZ_PER_KHZ;
 346                         clk_put(cpu_clk);
 347                 }
 348         } else {
 349                 if (raw_capacity) {
 350                         pr_err("cpu_capacity: missing %pOF raw capacity\n",
 351                                 cpu_node);
 352                         pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
 353                 }
 354                 cap_parsing_failed = true;
 355                 free_raw_capacity();
 356         }
 357
 358         return !ret;
 359 }
 360
 361 void __weak freq_inv_set_max_ratio(int cpu, u64 max_rate)
 362 {
 363 }
 364
 365 #ifdef CONFIG_ACPI_CPPC_LIB
 366 #include <acpi/cppc_acpi.h>
 367
 368 void topology_init_cpu_capacity_cppc(void)
 369 {
 370         u64 capacity, capacity_scale = 0;
 371         struct cppc_perf_caps perf_caps;
 372         int cpu;
 373
 374         if (likely(!acpi_cpc_valid()))
 375                 return;
 376
 377         raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity),
 378                                GFP_KERNEL);
 379         if (!raw_capacity)
 380                 return;
 381
 382         for_each_possible_cpu(cpu) {
 383                 if (!cppc_get_perf_caps(cpu, &perf_caps) &&
 384                     (perf_caps.highest_perf >= perf_caps.nominal_perf) &&
 385                     (perf_caps.highest_perf >= perf_caps.lowest_perf)) {
 386                         raw_capacity[cpu] = perf_caps.highest_perf;
 387                         capacity_scale = max_t(u64, capacity_scale, raw_capacity[cpu]);
 388
 389                         per_cpu(capacity_freq_ref, cpu) = cppc_perf_to_khz(&perf_caps, raw_capacity[cpu]);
 390
 391                         pr_debug("cpu_capacity: CPU%d cpu_capacity=%u (raw).\n",
 392                                  cpu, raw_capacity[cpu]);
 393                         continue;
 394                 }
 395
 396                 pr_err("cpu_capacity: CPU%d missing/invalid highest performance.\n", cpu);
 397                 pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
 398                 goto exit;
 399         }
 400
 401         for_each_possible_cpu(cpu) {
 402                 freq_inv_set_max_ratio(cpu,
 403                                        per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ);
 404
 405                 capacity = raw_capacity[cpu];
 406                 capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT,
 407                                      capacity_scale);
 408                 topology_set_cpu_scale(cpu, capacity);
 409                 pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
 410                         cpu, topology_get_cpu_scale(cpu));
 411         }
 412
 413         schedule_work(&update_topology_flags_work);
 414         pr_debug("cpu_capacity: cpu_capacity initialization done\n");
 415
 416 exit:
 417         free_raw_capacity();
 418 }
 419 #endif
 420
 421 #ifdef CONFIG_CPU_FREQ
 422 static cpumask_var_t cpus_to_visit;
 423 static void parsing_done_workfn(struct work_struct *work);
 424 static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
 425
 426 static int
 427 init_cpu_capacity_callback(struct notifier_block *nb,
 428                            unsigned long val,
 429                            void *data)
 430 {
 431         struct cpufreq_policy *policy = data;
 432         int cpu;
 433
 434         if (val != CPUFREQ_CREATE_POLICY)
 435                 return 0;
 436
 437         pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
 438                  cpumask_pr_args(policy->related_cpus),
 439                  cpumask_pr_args(cpus_to_visit));
 440
 441         cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);
 442
 443         for_each_cpu(cpu, policy->related_cpus) {
 444                 per_cpu(capacity_freq_ref, cpu) = policy->cpuinfo.max_freq;
 445                 freq_inv_set_max_ratio(cpu,
 446                                        per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ);
 447         }
 448
 449         if (cpumask_empty(cpus_to_visit)) {
 450                 if (raw_capacity) {
 451                         topology_normalize_cpu_scale();
 452                         schedule_work(&update_topology_flags_work);
 453                         free_raw_capacity();
 454                 }
 455                 pr_debug("cpu_capacity: parsing done\n");
 456                 schedule_work(&parsing_done_work);
 457         }
 458
 459         return 0;
 460 }
 461
 462 static struct notifier_block init_cpu_capacity_notifier = {
 463         .notifier_call = init_cpu_capacity_callback,
 464 };
 465
 466 static int __init register_cpufreq_notifier(void)
 467 {
 468         int ret;
 469
 470         /*
 471          * On ACPI-based systems skip registering cpufreq notifier as cpufreq
 472          * information is not needed for cpu capacity initialization.
 473          */
 474         if (!acpi_disabled)
 475                 return -EINVAL;
 476
 477         if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL))
 478                 return -ENOMEM;
 479
 480         cpumask_copy(cpus_to_visit, cpu_possible_mask);
 481
 482         ret = cpufreq_register_notifier(&init_cpu_capacity_notifier,
 483                                         CPUFREQ_POLICY_NOTIFIER);
 484
 485         if (ret)
 486                 free_cpumask_var(cpus_to_visit);
 487
 488         return ret;
 489 }
 490 core_initcall(register_cpufreq_notifier);
 491
 492 static void parsing_done_workfn(struct work_struct *work)
 493 {
 494         cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
 495                                          CPUFREQ_POLICY_NOTIFIER);
 496         free_cpumask_var(cpus_to_visit);
 497 }
 498
 499 #else
 500 core_initcall(free_raw_capacity);
 501 #endif
 502
 503 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 504 /*
 505  * This function returns the logic cpu number of the node.
 506  * There are basically three kinds of return values:
 507  * (1) logic cpu number which is > 0.
 508  * (2) -ENODEV when the device tree(DT) node is valid and found in the DT but
 509  * there is no possible logical CPU in the kernel to match. This happens
 510  * when CONFIG_NR_CPUS is configure to be smaller than the number of
 511  * CPU nodes in DT. We need to just ignore this case.
 512  * (3) -1 if the node does not exist in the device tree
 513  */
 514 static int __init get_cpu_for_node(struct device_node *node)
 515 {
 516         struct device_node *cpu_node;
 517         int cpu;
 518
 519         cpu_node = of_parse_phandle(node, "cpu", 0);
 520         if (!cpu_node)
 521                 return -1;
 522
 523         cpu = of_cpu_node_to_id(cpu_node);
 524         if (cpu >= 0)
 525                 topology_parse_cpu_capacity(cpu_node, cpu);
 526         else
 527                 pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n",
 528                         cpu_node, cpumask_pr_args(cpu_possible_mask));
 529
 530         of_node_put(cpu_node);
 531         return cpu;
 532 }
 533
 534 static int __init parse_core(struct device_node *core, int package_id,
 535                              int cluster_id, int core_id)
 536 {
 537         char name[20];
 538         bool leaf = true;
 539         int i = 0;
 540         int cpu;
 541         struct device_node *t;
 542
 543         do {
 544                 snprintf(name, sizeof(name), "thread%d", i);
 545                 t = of_get_child_by_name(core, name);
 546                 if (t) {
 547                         leaf = false;
 548                         cpu = get_cpu_for_node(t);
 549                         if (cpu >= 0) {
 550                                 cpu_topology[cpu].package_id = package_id;
 551                                 cpu_topology[cpu].cluster_id = cluster_id;
 552                                 cpu_topology[cpu].core_id = core_id;
 553                                 cpu_topology[cpu].thread_id = i;
 554                         } else if (cpu != -ENODEV) {
 555                                 pr_err("%pOF: Can't get CPU for thread\n", t);
 556                                 of_node_put(t);
 557                                 return -EINVAL;
 558                         }
 559                         of_node_put(t);
 560                 }
 561                 i++;
 562         } while (t);
 563
 564         cpu = get_cpu_for_node(core);
 565         if (cpu >= 0) {
 566                 if (!leaf) {
 567                         pr_err("%pOF: Core has both threads and CPU\n",
 568                                core);
 569                         return -EINVAL;
 570                 }
 571
 572                 cpu_topology[cpu].package_id = package_id;
 573                 cpu_topology[cpu].cluster_id = cluster_id;
 574                 cpu_topology[cpu].core_id = core_id;
 575         } else if (leaf && cpu != -ENODEV) {
 576                 pr_err("%pOF: Can't get CPU for leaf core\n", core);
 577                 return -EINVAL;
 578         }
 579
 580         return 0;
 581 }
 582
 583 static int __init parse_cluster(struct device_node *cluster, int package_id,
 584                                 int cluster_id, int depth)
 585 {
 586         char name[20];
 587         bool leaf = true;
 588         bool has_cores = false;
 589         struct device_node *c;
 590         int core_id = 0;
 591         int i, ret;
 592
 593         /*
 594          * First check for child clusters; we currently ignore any
 595          * information about the nesting of clusters and present the
 596          * scheduler with a flat list of them.
 597          */
 598         i = 0;
 599         do {
 600                 snprintf(name, sizeof(name), "cluster%d", i);
 601                 c = of_get_child_by_name(cluster, name);
 602                 if (c) {
 603                         leaf = false;
 604                         ret = parse_cluster(c, package_id, i, depth + 1);
 605                         if (depth > 0)
 606                                 pr_warn("Topology for clusters of clusters not yet supported\n");
 607                         of_node_put(c);
 608                         if (ret != 0)
 609                                 return ret;
 610                 }
 611                 i++;
 612         } while (c);
 613
 614         /* Now check for cores */
 615         i = 0;
 616         do {
 617                 snprintf(name, sizeof(name), "core%d", i);
 618                 c = of_get_child_by_name(cluster, name);
 619                 if (c) {
 620                         has_cores = true;
 621
 622                         if (depth == 0) {
 623                                 pr_err("%pOF: cpu-map children should be clusters\n",
 624                                        c);
 625                                 of_node_put(c);
 626                                 return -EINVAL;
 627                         }
 628
 629                         if (leaf) {
 630                                 ret = parse_core(c, package_id, cluster_id,
 631                                                  core_id++);
 632                         } else {
 633                                 pr_err("%pOF: Non-leaf cluster with core %s\n",
 634                                        cluster, name);
 635                                 ret = -EINVAL;
 636                         }
 637
 638                         of_node_put(c);
 639                         if (ret != 0)
 640                                 return ret;
 641                 }
 642                 i++;
 643         } while (c);
 644
 645         if (leaf && !has_cores)
 646                 pr_warn("%pOF: empty cluster\n", cluster);
 647
 648         return 0;
 649 }
 650
 651 static int __init parse_socket(struct device_node *socket)
 652 {
 653         char name[20];
 654         struct device_node *c;
 655         bool has_socket = false;
 656         int package_id = 0, ret;
 657
 658         do {
 659                 snprintf(name, sizeof(name), "socket%d", package_id);
 660                 c = of_get_child_by_name(socket, name);
 661                 if (c) {
 662                         has_socket = true;
 663                         ret = parse_cluster(c, package_id, -1, 0);
 664                         of_node_put(c);
 665                         if (ret != 0)
 666                                 return ret;
 667                 }
 668                 package_id++;
 669         } while (c);
 670
 671         if (!has_socket)
 672                 ret = parse_cluster(socket, 0, -1, 0);
 673
 674         return ret;
 675 }
 676
 677 static int __init parse_dt_topology(void)
 678 {
 679         struct device_node *cn, *map;
 680         int ret = 0;
 681         int cpu;
 682
 683         cn = of_find_node_by_path("/cpus");
 684         if (!cn) {
 685                 pr_err("No CPU information found in DT\n");
 686                 return 0;
 687         }
 688
 689         /*
 690          * When topology is provided cpu-map is essentially a root
 691          * cluster with restricted subnodes.
 692          */
 693         map = of_get_child_by_name(cn, "cpu-map");
 694         if (!map)
 695                 goto out;
 696
 697         ret = parse_socket(map);
 698         if (ret != 0)
 699                 goto out_map;
 700
 701         topology_normalize_cpu_scale();
 702
 703         /*
 704          * Check that all cores are in the topology; the SMP code will
 705          * only mark cores described in the DT as possible.
 706          */
 707         for_each_possible_cpu(cpu)
 708                 if (cpu_topology[cpu].package_id < 0) {
 709                         ret = -EINVAL;
 710                         break;
 711                 }
 712
 713 out_map:
 714         of_node_put(map);
 715 out:
 716         of_node_put(cn);
 717         return ret;
 718 }
 719 #endif
 720
 721 /*
 722  * cpu topology table
 723  */
 724 struct cpu_topology cpu_topology[NR_CPUS];
 725 EXPORT_SYMBOL_GPL(cpu_topology);
 726
 727 const struct cpumask *cpu_coregroup_mask(int cpu)
 728 {
 729         const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
 730
 731         /* Find the smaller of NUMA, core or LLC siblings */
 732         if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
 733                 /* not numa in package, lets use the package siblings */
 734                 core_mask = &cpu_topology[cpu].core_sibling;
 735         }
 736
 737         if (last_level_cache_is_valid(cpu)) {
 738                 if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
 739                         core_mask = &cpu_topology[cpu].llc_sibling;
 740         }
 741
 742         /*
 743          * For systems with no shared cpu-side LLC but with clusters defined,
 744          * extend core_mask to cluster_siblings. The sched domain builder will
 745          * then remove MC as redundant with CLS if SCHED_CLUSTER is enabled.
 746          */
 747         if (IS_ENABLED(CONFIG_SCHED_CLUSTER) &&
 748             cpumask_subset(core_mask, &cpu_topology[cpu].cluster_sibling))
 749                 core_mask = &cpu_topology[cpu].cluster_sibling;
 750
 751         return core_mask;
 752 }
 753
 754 const struct cpumask *cpu_clustergroup_mask(int cpu)
 755 {
 756         /*
 757          * Forbid cpu_clustergroup_mask() to span more or the same CPUs as
 758          * cpu_coregroup_mask().
 759          */
 760         if (cpumask_subset(cpu_coregroup_mask(cpu),
 761                            &cpu_topology[cpu].cluster_sibling))
 762                 return topology_sibling_cpumask(cpu);
 763
 764         return &cpu_topology[cpu].cluster_sibling;
 765 }
 766
 767 void update_siblings_masks(unsigned int cpuid)
 768 {
 769         struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
 770         int cpu, ret;
 771
 772         ret = detect_cache_attributes(cpuid);
 773         if (ret && ret != -ENOENT)
 774                 pr_info("Early cacheinfo allocation failed, ret = %d\n", ret);
 775
 776         /* update core and thread sibling masks */
 777         for_each_online_cpu(cpu) {
 778                 cpu_topo = &cpu_topology[cpu];
 779
 780                 if (last_level_cache_is_shared(cpu, cpuid)) {
 781                         cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
 782                         cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
 783                 }
 784
 785                 if (cpuid_topo->package_id != cpu_topo->package_id)
 786                         continue;
 787
 788                 cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
 789                 cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
 790
 791                 if (cpuid_topo->cluster_id != cpu_topo->cluster_id)
 792                         continue;
 793
 794                 if (cpuid_topo->cluster_id >= 0) {
 795                         cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling);
 796                         cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling);
 797                 }
 798
 799                 if (cpuid_topo->core_id != cpu_topo->core_id)
 800                         continue;
 801
 802                 cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
 803                 cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
 804         }
 805 }
 806
 807 static void clear_cpu_topology(int cpu)
 808 {
 809         struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 810
 811         cpumask_clear(&cpu_topo->llc_sibling);
 812         cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
 813
 814         cpumask_clear(&cpu_topo->cluster_sibling);
 815         cpumask_set_cpu(cpu, &cpu_topo->cluster_sibling);
 816
 817         cpumask_clear(&cpu_topo->core_sibling);
 818         cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
 819         cpumask_clear(&cpu_topo->thread_sibling);
 820         cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
 821 }
 822
 823 void __init reset_cpu_topology(void)
 824 {
 825         unsigned int cpu;
 826
 827         for_each_possible_cpu(cpu) {
 828                 struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 829
 830                 cpu_topo->thread_id = -1;
 831                 cpu_topo->core_id = -1;
 832                 cpu_topo->cluster_id = -1;
 833                 cpu_topo->package_id = -1;
 834
 835                 clear_cpu_topology(cpu);
 836         }
 837 }
 838
 839 void remove_cpu_topology(unsigned int cpu)
 840 {
 841         int sibling;
 842
 843         for_each_cpu(sibling, topology_core_cpumask(cpu))
 844                 cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
 845         for_each_cpu(sibling, topology_sibling_cpumask(cpu))
 846                 cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
 847         for_each_cpu(sibling, topology_cluster_cpumask(cpu))
 848                 cpumask_clear_cpu(cpu, topology_cluster_cpumask(sibling));
 849         for_each_cpu(sibling, topology_llc_cpumask(cpu))
 850                 cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
 851
 852         clear_cpu_topology(cpu);
 853 }
 854
 855 __weak int __init parse_acpi_topology(void)
 856 {
 857         return 0;
 858 }
 859
 860 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 861 void __init init_cpu_topology(void)
 862 {
 863         int cpu, ret;
 864
 865         reset_cpu_topology();
 866         ret = parse_acpi_topology();
 867         if (!ret)
 868                 ret = of_have_populated_dt() && parse_dt_topology();
 869
 870         if (ret) {
 871                 /*
 872                  * Discard anything that was parsed if we hit an error so we
 873                  * don't use partial information. But do not return yet to give
 874                  * arch-specific early cache level detection a chance to run.
 875                  */
 876                 reset_cpu_topology();
 877         }
 878
 879         for_each_possible_cpu(cpu) {
 880                 ret = fetch_cache_info(cpu);
 881                 if (!ret)
 882                         continue;
 883                 else if (ret != -ENOENT)
 884                         pr_err("Early cacheinfo failed, ret = %d\n", ret);
 885                 return;
 886         }
 887 }
 888
 889 void store_cpu_topology(unsigned int cpuid)
 890 {
 891         struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
 892
 893         if (cpuid_topo->package_id != -1)
 894                 goto topology_populated;
 895
 896         cpuid_topo->thread_id = -1;
 897         cpuid_topo->core_id = cpuid;
 898         cpuid_topo->package_id = cpu_to_node(cpuid);
 899
 900         pr_debug("CPU%u: package %d core %d thread %d\n",
 901                  cpuid, cpuid_topo->package_id, cpuid_topo->core_id,
 902                  cpuid_topo->thread_id);
 903
 904 topology_populated:
 905         update_siblings_masks(cpuid);
 906 }
 907 #endif