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 static inline 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 void acpi_processor_init_invariance_cppc(void)
 421 {
 422         topology_init_cpu_capacity_cppc();
 423 }
 424 #endif
 425
 426 #ifdef CONFIG_CPU_FREQ
 427 static cpumask_var_t cpus_to_visit;
 428 static void parsing_done_workfn(struct work_struct *work);
 429 static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
 430
 431 static int
 432 init_cpu_capacity_callback(struct notifier_block *nb,
 433                            unsigned long val,
 434                            void *data)
 435 {
 436         struct cpufreq_policy *policy = data;
 437         int cpu;
 438
 439         if (val != CPUFREQ_CREATE_POLICY)
 440                 return 0;
 441
 442         pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
 443                  cpumask_pr_args(policy->related_cpus),
 444                  cpumask_pr_args(cpus_to_visit));
 445
 446         cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);
 447
 448         for_each_cpu(cpu, policy->related_cpus) {
 449                 per_cpu(capacity_freq_ref, cpu) = policy->cpuinfo.max_freq;
 450                 freq_inv_set_max_ratio(cpu,
 451                                        per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ);
 452         }
 453
 454         if (cpumask_empty(cpus_to_visit)) {
 455                 if (raw_capacity) {
 456                         topology_normalize_cpu_scale();
 457                         schedule_work(&update_topology_flags_work);
 458                         free_raw_capacity();
 459                 }
 460                 pr_debug("cpu_capacity: parsing done\n");
 461                 schedule_work(&parsing_done_work);
 462         }
 463
 464         return 0;
 465 }
 466
 467 static struct notifier_block init_cpu_capacity_notifier = {
 468         .notifier_call = init_cpu_capacity_callback,
 469 };
 470
 471 static int __init register_cpufreq_notifier(void)
 472 {
 473         int ret;
 474
 475         /*
 476          * On ACPI-based systems skip registering cpufreq notifier as cpufreq
 477          * information is not needed for cpu capacity initialization.
 478          */
 479         if (!acpi_disabled)
 480                 return -EINVAL;
 481
 482         if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL))
 483                 return -ENOMEM;
 484
 485         cpumask_copy(cpus_to_visit, cpu_possible_mask);
 486
 487         ret = cpufreq_register_notifier(&init_cpu_capacity_notifier,
 488                                         CPUFREQ_POLICY_NOTIFIER);
 489
 490         if (ret)
 491                 free_cpumask_var(cpus_to_visit);
 492
 493         return ret;
 494 }
 495 core_initcall(register_cpufreq_notifier);
 496
 497 static void parsing_done_workfn(struct work_struct *work)
 498 {
 499         cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
 500                                          CPUFREQ_POLICY_NOTIFIER);
 501         free_cpumask_var(cpus_to_visit);
 502 }
 503
 504 #else
 505 core_initcall(free_raw_capacity);
 506 #endif
 507
 508 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 509 /*
 510  * This function returns the logic cpu number of the node.
 511  * There are basically three kinds of return values:
 512  * (1) logic cpu number which is > 0.
 513  * (2) -ENODEV when the device tree(DT) node is valid and found in the DT but
 514  * there is no possible logical CPU in the kernel to match. This happens
 515  * when CONFIG_NR_CPUS is configure to be smaller than the number of
 516  * CPU nodes in DT. We need to just ignore this case.
 517  * (3) -1 if the node does not exist in the device tree
 518  */
 519 static int __init get_cpu_for_node(struct device_node *node)
 520 {
 521         int cpu;
 522         struct device_node *cpu_node __free(device_node) =
 523                 of_parse_phandle(node, "cpu", 0);
 524
 525         if (!cpu_node)
 526                 return -1;
 527
 528         cpu = of_cpu_node_to_id(cpu_node);
 529         if (cpu >= 0)
 530                 topology_parse_cpu_capacity(cpu_node, cpu);
 531         else
 532                 pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n",
 533                         cpu_node, cpumask_pr_args(cpu_possible_mask));
 534
 535         return cpu;
 536 }
 537
 538 static int __init parse_core(struct device_node *core, int package_id,
 539                              int cluster_id, int core_id)
 540 {
 541         char name[20];
 542         bool leaf = true;
 543         int i = 0;
 544         int cpu;
 545
 546         do {
 547                 snprintf(name, sizeof(name), "thread%d", i);
 548                 struct device_node *t __free(device_node) =
 549                         of_get_child_by_name(core, name);
 550
 551                 if (!t)
 552                         break;
 553
 554                 leaf = false;
 555                 cpu = get_cpu_for_node(t);
 556                 if (cpu >= 0) {
 557                         cpu_topology[cpu].package_id = package_id;
 558                         cpu_topology[cpu].cluster_id = cluster_id;
 559                         cpu_topology[cpu].core_id = core_id;
 560                         cpu_topology[cpu].thread_id = i;
 561                 } else if (cpu != -ENODEV) {
 562                         pr_err("%pOF: Can't get CPU for thread\n", t);
 563                         return -EINVAL;
 564                 }
 565                 i++;
 566         } while (1);
 567
 568         cpu = get_cpu_for_node(core);
 569         if (cpu >= 0) {
 570                 if (!leaf) {
 571                         pr_err("%pOF: Core has both threads and CPU\n",
 572                                core);
 573                         return -EINVAL;
 574                 }
 575
 576                 cpu_topology[cpu].package_id = package_id;
 577                 cpu_topology[cpu].cluster_id = cluster_id;
 578                 cpu_topology[cpu].core_id = core_id;
 579         } else if (leaf && cpu != -ENODEV) {
 580                 pr_err("%pOF: Can't get CPU for leaf core\n", core);
 581                 return -EINVAL;
 582         }
 583
 584         return 0;
 585 }
 586
 587 static int __init parse_cluster(struct device_node *cluster, int package_id,
 588                                 int cluster_id, int depth)
 589 {
 590         char name[20];
 591         bool leaf = true;
 592         bool has_cores = false;
 593         int core_id = 0;
 594         int i, ret;
 595
 596         /*
 597          * First check for child clusters; we currently ignore any
 598          * information about the nesting of clusters and present the
 599          * scheduler with a flat list of them.
 600          */
 601         i = 0;
 602         do {
 603                 snprintf(name, sizeof(name), "cluster%d", i);
 604                 struct device_node *c __free(device_node) =
 605                         of_get_child_by_name(cluster, name);
 606
 607                 if (!c)
 608                         break;
 609
 610                 leaf = false;
 611                 ret = parse_cluster(c, package_id, i, depth + 1);
 612                 if (depth > 0)
 613                         pr_warn("Topology for clusters of clusters not yet supported\n");
 614                 if (ret != 0)
 615                         return ret;
 616                 i++;
 617         } while (1);
 618
 619         /* Now check for cores */
 620         i = 0;
 621         do {
 622                 snprintf(name, sizeof(name), "core%d", i);
 623                 struct device_node *c __free(device_node) =
 624                         of_get_child_by_name(cluster, name);
 625
 626                 if (!c)
 627                         break;
 628
 629                 has_cores = true;
 630
 631                 if (depth == 0) {
 632                         pr_err("%pOF: cpu-map children should be clusters\n", c);
 633                         return -EINVAL;
 634                 }
 635
 636                 if (leaf) {
 637                         ret = parse_core(c, package_id, cluster_id, core_id++);
 638                         if (ret != 0)
 639                                 return ret;
 640                 } else {
 641                         pr_err("%pOF: Non-leaf cluster with core %s\n",
 642                                cluster, name);
 643                         return -EINVAL;
 644                 }
 645
 646                 i++;
 647         } while (1);
 648
 649         if (leaf && !has_cores)
 650                 pr_warn("%pOF: empty cluster\n", cluster);
 651
 652         return 0;
 653 }
 654
 655 static int __init parse_socket(struct device_node *socket)
 656 {
 657         char name[20];
 658         bool has_socket = false;
 659         int package_id = 0, ret;
 660
 661         do {
 662                 snprintf(name, sizeof(name), "socket%d", package_id);
 663                 struct device_node *c __free(device_node) =
 664                         of_get_child_by_name(socket, name);
 665
 666                 if (!c)
 667                         break;
 668
 669                 has_socket = true;
 670                 ret = parse_cluster(c, package_id, -1, 0);
 671                 if (ret != 0)
 672                         return ret;
 673
 674                 package_id++;
 675         } while (1);
 676
 677         if (!has_socket)
 678                 ret = parse_cluster(socket, 0, -1, 0);
 679
 680         return ret;
 681 }
 682
 683 static int __init parse_dt_topology(void)
 684 {
 685         int ret = 0;
 686         int cpu;
 687         struct device_node *cn __free(device_node) =
 688                 of_find_node_by_path("/cpus");
 689
 690         if (!cn) {
 691                 pr_err("No CPU information found in DT\n");
 692                 return 0;
 693         }
 694
 695         /*
 696          * When topology is provided cpu-map is essentially a root
 697          * cluster with restricted subnodes.
 698          */
 699         struct device_node *map __free(device_node) =
 700                 of_get_child_by_name(cn, "cpu-map");
 701
 702         if (!map)
 703                 return ret;
 704
 705         ret = parse_socket(map);
 706         if (ret != 0)
 707                 return ret;
 708
 709         topology_normalize_cpu_scale();
 710
 711         /*
 712          * Check that all cores are in the topology; the SMP code will
 713          * only mark cores described in the DT as possible.
 714          */
 715         for_each_possible_cpu(cpu)
 716                 if (cpu_topology[cpu].package_id < 0) {
 717                         return -EINVAL;
 718                 }
 719
 720         return ret;
 721 }
 722 #endif
 723
 724 /*
 725  * cpu topology table
 726  */
 727 struct cpu_topology cpu_topology[NR_CPUS];
 728 EXPORT_SYMBOL_GPL(cpu_topology);
 729
 730 const struct cpumask *cpu_coregroup_mask(int cpu)
 731 {
 732         const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
 733
 734         /* Find the smaller of NUMA, core or LLC siblings */
 735         if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
 736                 /* not numa in package, lets use the package siblings */
 737                 core_mask = &cpu_topology[cpu].core_sibling;
 738         }
 739
 740         if (last_level_cache_is_valid(cpu)) {
 741                 if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
 742                         core_mask = &cpu_topology[cpu].llc_sibling;
 743         }
 744
 745         /*
 746          * For systems with no shared cpu-side LLC but with clusters defined,
 747          * extend core_mask to cluster_siblings. The sched domain builder will
 748          * then remove MC as redundant with CLS if SCHED_CLUSTER is enabled.
 749          */
 750         if (IS_ENABLED(CONFIG_SCHED_CLUSTER) &&
 751             cpumask_subset(core_mask, &cpu_topology[cpu].cluster_sibling))
 752                 core_mask = &cpu_topology[cpu].cluster_sibling;
 753
 754         return core_mask;
 755 }
 756
 757 const struct cpumask *cpu_clustergroup_mask(int cpu)
 758 {
 759         /*
 760          * Forbid cpu_clustergroup_mask() to span more or the same CPUs as
 761          * cpu_coregroup_mask().
 762          */
 763         if (cpumask_subset(cpu_coregroup_mask(cpu),
 764                            &cpu_topology[cpu].cluster_sibling))
 765                 return topology_sibling_cpumask(cpu);
 766
 767         return &cpu_topology[cpu].cluster_sibling;
 768 }
 769
 770 void update_siblings_masks(unsigned int cpuid)
 771 {
 772         struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
 773         int cpu, ret;
 774
 775         ret = detect_cache_attributes(cpuid);
 776         if (ret && ret != -ENOENT)
 777                 pr_info("Early cacheinfo allocation failed, ret = %d\n", ret);
 778
 779         /* update core and thread sibling masks */
 780         for_each_online_cpu(cpu) {
 781                 cpu_topo = &cpu_topology[cpu];
 782
 783                 if (last_level_cache_is_shared(cpu, cpuid)) {
 784                         cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
 785                         cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
 786                 }
 787
 788                 if (cpuid_topo->package_id != cpu_topo->package_id)
 789                         continue;
 790
 791                 cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
 792                 cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
 793
 794                 if (cpuid_topo->cluster_id != cpu_topo->cluster_id)
 795                         continue;
 796
 797                 if (cpuid_topo->cluster_id >= 0) {
 798                         cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling);
 799                         cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling);
 800                 }
 801
 802                 if (cpuid_topo->core_id != cpu_topo->core_id)
 803                         continue;
 804
 805                 cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
 806                 cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
 807         }
 808 }
 809
 810 static void clear_cpu_topology(int cpu)
 811 {
 812         struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 813
 814         cpumask_clear(&cpu_topo->llc_sibling);
 815         cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
 816
 817         cpumask_clear(&cpu_topo->cluster_sibling);
 818         cpumask_set_cpu(cpu, &cpu_topo->cluster_sibling);
 819
 820         cpumask_clear(&cpu_topo->core_sibling);
 821         cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
 822         cpumask_clear(&cpu_topo->thread_sibling);
 823         cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
 824 }
 825
 826 void __init reset_cpu_topology(void)
 827 {
 828         unsigned int cpu;
 829
 830         for_each_possible_cpu(cpu) {
 831                 struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 832
 833                 cpu_topo->thread_id = -1;
 834                 cpu_topo->core_id = -1;
 835                 cpu_topo->cluster_id = -1;
 836                 cpu_topo->package_id = -1;
 837
 838                 clear_cpu_topology(cpu);
 839         }
 840 }
 841
 842 void remove_cpu_topology(unsigned int cpu)
 843 {
 844         int sibling;
 845
 846         for_each_cpu(sibling, topology_core_cpumask(cpu))
 847                 cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
 848         for_each_cpu(sibling, topology_sibling_cpumask(cpu))
 849                 cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
 850         for_each_cpu(sibling, topology_cluster_cpumask(cpu))
 851                 cpumask_clear_cpu(cpu, topology_cluster_cpumask(sibling));
 852         for_each_cpu(sibling, topology_llc_cpumask(cpu))
 853                 cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
 854
 855         clear_cpu_topology(cpu);
 856 }
 857
 858 __weak int __init parse_acpi_topology(void)
 859 {
 860         return 0;
 861 }
 862
 863 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 864 void __init init_cpu_topology(void)
 865 {
 866         int cpu, ret;
 867
 868         reset_cpu_topology();
 869         ret = parse_acpi_topology();
 870         if (!ret)
 871                 ret = of_have_populated_dt() && parse_dt_topology();
 872
 873         if (ret) {
 874                 /*
 875                  * Discard anything that was parsed if we hit an error so we
 876                  * don't use partial information. But do not return yet to give
 877                  * arch-specific early cache level detection a chance to run.
 878                  */
 879                 reset_cpu_topology();
 880         }
 881
 882         for_each_possible_cpu(cpu) {
 883                 ret = fetch_cache_info(cpu);
 884                 if (!ret)
 885                         continue;
 886                 else if (ret != -ENOENT)
 887                         pr_err("Early cacheinfo failed, ret = %d\n", ret);
 888                 return;
 889         }
 890 }
 891
 892 void store_cpu_topology(unsigned int cpuid)
 893 {
 894         struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
 895
 896         if (cpuid_topo->package_id != -1)
 897                 goto topology_populated;
 898
 899         cpuid_topo->thread_id = -1;
 900         cpuid_topo->core_id = cpuid;
 901         cpuid_topo->package_id = cpu_to_node(cpuid);
 902
 903         pr_debug("CPU%u: package %d core %d thread %d\n",
 904                  cpuid, cpuid_topo->package_id, cpuid_topo->core_id,
 905                  cpuid_topo->thread_id);
 906
 907 topology_populated:
 908         update_siblings_masks(cpuid);
 909 }
 910 #endif