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