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
  23 #define CREATE_TRACE_POINTS
  24 #include <trace/events/thermal_pressure.h>
  25
  26 static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data);
  27 static struct cpumask scale_freq_counters_mask;
  28 static bool scale_freq_invariant;
  29 static DEFINE_PER_CPU(u32, freq_factor) = 1;
  30
  31 static bool supports_scale_freq_counters(const struct cpumask *cpus)
  32 {
  33         return cpumask_subset(cpus, &scale_freq_counters_mask);
  34 }
  35
  36 bool topology_scale_freq_invariant(void)
  37 {
  38         return cpufreq_supports_freq_invariance() ||
  39                supports_scale_freq_counters(cpu_online_mask);
  40 }
  41
  42 static void update_scale_freq_invariant(bool status)
  43 {
  44         if (scale_freq_invariant == status)
  45                 return;
  46
  47         /*
  48          * Task scheduler behavior depends on frequency invariance support,
  49          * either cpufreq or counter driven. If the support status changes as
  50          * a result of counter initialisation and use, retrigger the build of
  51          * scheduling domains to ensure the information is propagated properly.
  52          */
  53         if (topology_scale_freq_invariant() == status) {
  54                 scale_freq_invariant = status;
  55                 rebuild_sched_domains_energy();
  56         }
  57 }
  58
  59 void topology_set_scale_freq_source(struct scale_freq_data *data,
  60                                     const struct cpumask *cpus)
  61 {
  62         struct scale_freq_data *sfd;
  63         int cpu;
  64
  65         /*
  66          * Avoid calling rebuild_sched_domains() unnecessarily if FIE is
  67          * supported by cpufreq.
  68          */
  69         if (cpumask_empty(&scale_freq_counters_mask))
  70                 scale_freq_invariant = topology_scale_freq_invariant();
  71
  72         rcu_read_lock();
  73
  74         for_each_cpu(cpu, cpus) {
  75                 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
  76
  77                 /* Use ARCH provided counters whenever possible */
  78                 if (!sfd || sfd->source != SCALE_FREQ_SOURCE_ARCH) {
  79                         rcu_assign_pointer(per_cpu(sft_data, cpu), data);
  80                         cpumask_set_cpu(cpu, &scale_freq_counters_mask);
  81                 }
  82         }
  83
  84         rcu_read_unlock();
  85
  86         update_scale_freq_invariant(true);
  87 }
  88 EXPORT_SYMBOL_GPL(topology_set_scale_freq_source);
  89
  90 void topology_clear_scale_freq_source(enum scale_freq_source source,
  91                                       const struct cpumask *cpus)
  92 {
  93         struct scale_freq_data *sfd;
  94         int cpu;
  95
  96         rcu_read_lock();
  97
  98         for_each_cpu(cpu, cpus) {
  99                 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu));
 100
 101                 if (sfd && sfd->source == source) {
 102                         rcu_assign_pointer(per_cpu(sft_data, cpu), NULL);
 103                         cpumask_clear_cpu(cpu, &scale_freq_counters_mask);
 104                 }
 105         }
 106
 107         rcu_read_unlock();
 108
 109         /*
 110          * Make sure all references to previous sft_data are dropped to avoid
 111          * use-after-free races.
 112          */
 113         synchronize_rcu();
 114
 115         update_scale_freq_invariant(false);
 116 }
 117 EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source);
 118
 119 void topology_scale_freq_tick(void)
 120 {
 121         struct scale_freq_data *sfd = rcu_dereference_sched(*this_cpu_ptr(&sft_data));
 122
 123         if (sfd)
 124                 sfd->set_freq_scale();
 125 }
 126
 127 DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
 128 EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale);
 129
 130 void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
 131                              unsigned long max_freq)
 132 {
 133         unsigned long scale;
 134         int i;
 135
 136         if (WARN_ON_ONCE(!cur_freq || !max_freq))
 137                 return;
 138
 139         /*
 140          * If the use of counters for FIE is enabled, just return as we don't
 141          * want to update the scale factor with information from CPUFREQ.
 142          * Instead the scale factor will be updated from arch_scale_freq_tick.
 143          */
 144         if (supports_scale_freq_counters(cpus))
 145                 return;
 146
 147         scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq;
 148
 149         for_each_cpu(i, cpus)
 150                 per_cpu(arch_freq_scale, i) = scale;
 151 }
 152
 153 DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE;
 154 EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale);
 155
 156 void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
 157 {
 158         per_cpu(cpu_scale, cpu) = capacity;
 159 }
 160
 161 DEFINE_PER_CPU(unsigned long, thermal_pressure);
 162
 163 /**
 164  * topology_update_thermal_pressure() - Update thermal pressure for CPUs
 165  * @cpus        : The related CPUs for which capacity has been reduced
 166  * @capped_freq : The maximum allowed frequency that CPUs can run at
 167  *
 168  * Update the value of thermal pressure for all @cpus in the mask. The
 169  * cpumask should include all (online+offline) affected CPUs, to avoid
 170  * operating on stale data when hot-plug is used for some CPUs. The
 171  * @capped_freq reflects the currently allowed max CPUs frequency due to
 172  * thermal capping. It might be also a boost frequency value, which is bigger
 173  * than the internal 'freq_factor' max frequency. In such case the pressure
 174  * value should simply be removed, since this is an indication that there is
 175  * no thermal throttling. The @capped_freq must be provided in kHz.
 176  */
 177 void topology_update_thermal_pressure(const struct cpumask *cpus,
 178                                       unsigned long capped_freq)
 179 {
 180         unsigned long max_capacity, capacity, th_pressure;
 181         u32 max_freq;
 182         int cpu;
 183
 184         cpu = cpumask_first(cpus);
 185         max_capacity = arch_scale_cpu_capacity(cpu);
 186         max_freq = per_cpu(freq_factor, cpu);
 187
 188         /* Convert to MHz scale which is used in 'freq_factor' */
 189         capped_freq /= 1000;
 190
 191         /*
 192          * Handle properly the boost frequencies, which should simply clean
 193          * the thermal 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         th_pressure = max_capacity - capacity;
 201
 202         trace_thermal_pressure_update(cpu, th_pressure);
 203
 204         for_each_cpu(cpu, cpus)
 205                 WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure);
 206 }
 207 EXPORT_SYMBOL_GPL(topology_update_thermal_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 register_cpu_capacity_sysctl(void)
 224 {
 225         int i;
 226         struct device *cpu;
 227
 228         for_each_possible_cpu(i) {
 229                 cpu = get_cpu_device(i);
 230                 if (!cpu) {
 231                         pr_err("%s: too early to get CPU%d device!\n",
 232                                __func__, i);
 233                         continue;
 234                 }
 235                 device_create_file(cpu, &dev_attr_cpu_capacity);
 236         }
 237
 238         return 0;
 239 }
 240 subsys_initcall(register_cpu_capacity_sysctl);
 241
 242 static int update_topology;
 243
 244 int topology_update_cpu_topology(void)
 245 {
 246         return update_topology;
 247 }
 248
 249 /*
 250  * Updating the sched_domains can't be done directly from cpufreq callbacks
 251  * due to locking, so queue the work for later.
 252  */
 253 static void update_topology_flags_workfn(struct work_struct *work)
 254 {
 255         update_topology = 1;
 256         rebuild_sched_domains();
 257         pr_debug("sched_domain hierarchy rebuilt, flags updated\n");
 258         update_topology = 0;
 259 }
 260
 261 static u32 *raw_capacity;
 262
 263 static int free_raw_capacity(void)
 264 {
 265         kfree(raw_capacity);
 266         raw_capacity = NULL;
 267
 268         return 0;
 269 }
 270
 271 void topology_normalize_cpu_scale(void)
 272 {
 273         u64 capacity;
 274         u64 capacity_scale;
 275         int cpu;
 276
 277         if (!raw_capacity)
 278                 return;
 279
 280         capacity_scale = 1;
 281         for_each_possible_cpu(cpu) {
 282                 capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
 283                 capacity_scale = max(capacity, capacity_scale);
 284         }
 285
 286         pr_debug("cpu_capacity: capacity_scale=%llu\n", capacity_scale);
 287         for_each_possible_cpu(cpu) {
 288                 capacity = raw_capacity[cpu] * per_cpu(freq_factor, cpu);
 289                 capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT,
 290                         capacity_scale);
 291                 topology_set_cpu_scale(cpu, capacity);
 292                 pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n",
 293                         cpu, topology_get_cpu_scale(cpu));
 294         }
 295 }
 296
 297 bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
 298 {
 299         struct clk *cpu_clk;
 300         static bool cap_parsing_failed;
 301         int ret;
 302         u32 cpu_capacity;
 303
 304         if (cap_parsing_failed)
 305                 return false;
 306
 307         ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",
 308                                    &cpu_capacity);
 309         if (!ret) {
 310                 if (!raw_capacity) {
 311                         raw_capacity = kcalloc(num_possible_cpus(),
 312                                                sizeof(*raw_capacity),
 313                                                GFP_KERNEL);
 314                         if (!raw_capacity) {
 315                                 cap_parsing_failed = true;
 316                                 return false;
 317                         }
 318                 }
 319                 raw_capacity[cpu] = cpu_capacity;
 320                 pr_debug("cpu_capacity: %pOF cpu_capacity=%u (raw)\n",
 321                         cpu_node, raw_capacity[cpu]);
 322
 323                 /*
 324                  * Update freq_factor for calculating early boot cpu capacities.
 325                  * For non-clk CPU DVFS mechanism, there's no way to get the
 326                  * frequency value now, assuming they are running at the same
 327                  * frequency (by keeping the initial freq_factor value).
 328                  */
 329                 cpu_clk = of_clk_get(cpu_node, 0);
 330                 if (!PTR_ERR_OR_ZERO(cpu_clk)) {
 331                         per_cpu(freq_factor, cpu) =
 332                                 clk_get_rate(cpu_clk) / 1000;
 333                         clk_put(cpu_clk);
 334                 }
 335         } else {
 336                 if (raw_capacity) {
 337                         pr_err("cpu_capacity: missing %pOF raw capacity\n",
 338                                 cpu_node);
 339                         pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
 340                 }
 341                 cap_parsing_failed = true;
 342                 free_raw_capacity();
 343         }
 344
 345         return !ret;
 346 }
 347
 348 #ifdef CONFIG_ACPI_CPPC_LIB
 349 #include <acpi/cppc_acpi.h>
 350
 351 void topology_init_cpu_capacity_cppc(void)
 352 {
 353         struct cppc_perf_caps perf_caps;
 354         int cpu;
 355
 356         if (likely(acpi_disabled || !acpi_cpc_valid()))
 357                 return;
 358
 359         raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity),
 360                                GFP_KERNEL);
 361         if (!raw_capacity)
 362                 return;
 363
 364         for_each_possible_cpu(cpu) {
 365                 if (!cppc_get_perf_caps(cpu, &perf_caps) &&
 366                     (perf_caps.highest_perf >= perf_caps.nominal_perf) &&
 367                     (perf_caps.highest_perf >= perf_caps.lowest_perf)) {
 368                         raw_capacity[cpu] = perf_caps.highest_perf;
 369                         pr_debug("cpu_capacity: CPU%d cpu_capacity=%u (raw).\n",
 370                                  cpu, raw_capacity[cpu]);
 371                         continue;
 372                 }
 373
 374                 pr_err("cpu_capacity: CPU%d missing/invalid highest performance.\n", cpu);
 375                 pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
 376                 goto exit;
 377         }
 378
 379         topology_normalize_cpu_scale();
 380         schedule_work(&update_topology_flags_work);
 381         pr_debug("cpu_capacity: cpu_capacity initialization done\n");
 382
 383 exit:
 384         free_raw_capacity();
 385 }
 386 #endif
 387
 388 #ifdef CONFIG_CPU_FREQ
 389 static cpumask_var_t cpus_to_visit;
 390 static void parsing_done_workfn(struct work_struct *work);
 391 static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
 392
 393 static int
 394 init_cpu_capacity_callback(struct notifier_block *nb,
 395                            unsigned long val,
 396                            void *data)
 397 {
 398         struct cpufreq_policy *policy = data;
 399         int cpu;
 400
 401         if (!raw_capacity)
 402                 return 0;
 403
 404         if (val != CPUFREQ_CREATE_POLICY)
 405                 return 0;
 406
 407         pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
 408                  cpumask_pr_args(policy->related_cpus),
 409                  cpumask_pr_args(cpus_to_visit));
 410
 411         cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);
 412
 413         for_each_cpu(cpu, policy->related_cpus)
 414                 per_cpu(freq_factor, cpu) = policy->cpuinfo.max_freq / 1000;
 415
 416         if (cpumask_empty(cpus_to_visit)) {
 417                 topology_normalize_cpu_scale();
 418                 schedule_work(&update_topology_flags_work);
 419                 free_raw_capacity();
 420                 pr_debug("cpu_capacity: parsing done\n");
 421                 schedule_work(&parsing_done_work);
 422         }
 423
 424         return 0;
 425 }
 426
 427 static struct notifier_block init_cpu_capacity_notifier = {
 428         .notifier_call = init_cpu_capacity_callback,
 429 };
 430
 431 static int __init register_cpufreq_notifier(void)
 432 {
 433         int ret;
 434
 435         /*
 436          * On ACPI-based systems skip registering cpufreq notifier as cpufreq
 437          * information is not needed for cpu capacity initialization.
 438          */
 439         if (!acpi_disabled || !raw_capacity)
 440                 return -EINVAL;
 441
 442         if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL))
 443                 return -ENOMEM;
 444
 445         cpumask_copy(cpus_to_visit, cpu_possible_mask);
 446
 447         ret = cpufreq_register_notifier(&init_cpu_capacity_notifier,
 448                                         CPUFREQ_POLICY_NOTIFIER);
 449
 450         if (ret)
 451                 free_cpumask_var(cpus_to_visit);
 452
 453         return ret;
 454 }
 455 core_initcall(register_cpufreq_notifier);
 456
 457 static void parsing_done_workfn(struct work_struct *work)
 458 {
 459         cpufreq_unregister_notifier(&init_cpu_capacity_notifier,
 460                                          CPUFREQ_POLICY_NOTIFIER);
 461         free_cpumask_var(cpus_to_visit);
 462 }
 463
 464 #else
 465 core_initcall(free_raw_capacity);
 466 #endif
 467
 468 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 469 /*
 470  * This function returns the logic cpu number of the node.
 471  * There are basically three kinds of return values:
 472  * (1) logic cpu number which is > 0.
 473  * (2) -ENODEV when the device tree(DT) node is valid and found in the DT but
 474  * there is no possible logical CPU in the kernel to match. This happens
 475  * when CONFIG_NR_CPUS is configure to be smaller than the number of
 476  * CPU nodes in DT. We need to just ignore this case.
 477  * (3) -1 if the node does not exist in the device tree
 478  */
 479 static int __init get_cpu_for_node(struct device_node *node)
 480 {
 481         struct device_node *cpu_node;
 482         int cpu;
 483
 484         cpu_node = of_parse_phandle(node, "cpu", 0);
 485         if (!cpu_node)
 486                 return -1;
 487
 488         cpu = of_cpu_node_to_id(cpu_node);
 489         if (cpu >= 0)
 490                 topology_parse_cpu_capacity(cpu_node, cpu);
 491         else
 492                 pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n",
 493                         cpu_node, cpumask_pr_args(cpu_possible_mask));
 494
 495         of_node_put(cpu_node);
 496         return cpu;
 497 }
 498
 499 static int __init parse_core(struct device_node *core, int package_id,
 500                              int cluster_id, int core_id)
 501 {
 502         char name[20];
 503         bool leaf = true;
 504         int i = 0;
 505         int cpu;
 506         struct device_node *t;
 507
 508         do {
 509                 snprintf(name, sizeof(name), "thread%d", i);
 510                 t = of_get_child_by_name(core, name);
 511                 if (t) {
 512                         leaf = false;
 513                         cpu = get_cpu_for_node(t);
 514                         if (cpu >= 0) {
 515                                 cpu_topology[cpu].package_id = package_id;
 516                                 cpu_topology[cpu].cluster_id = cluster_id;
 517                                 cpu_topology[cpu].core_id = core_id;
 518                                 cpu_topology[cpu].thread_id = i;
 519                         } else if (cpu != -ENODEV) {
 520                                 pr_err("%pOF: Can't get CPU for thread\n", t);
 521                                 of_node_put(t);
 522                                 return -EINVAL;
 523                         }
 524                         of_node_put(t);
 525                 }
 526                 i++;
 527         } while (t);
 528
 529         cpu = get_cpu_for_node(core);
 530         if (cpu >= 0) {
 531                 if (!leaf) {
 532                         pr_err("%pOF: Core has both threads and CPU\n",
 533                                core);
 534                         return -EINVAL;
 535                 }
 536
 537                 cpu_topology[cpu].package_id = package_id;
 538                 cpu_topology[cpu].cluster_id = cluster_id;
 539                 cpu_topology[cpu].core_id = core_id;
 540         } else if (leaf && cpu != -ENODEV) {
 541                 pr_err("%pOF: Can't get CPU for leaf core\n", core);
 542                 return -EINVAL;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int __init parse_cluster(struct device_node *cluster, int package_id,
 549                                 int cluster_id, int depth)
 550 {
 551         char name[20];
 552         bool leaf = true;
 553         bool has_cores = false;
 554         struct device_node *c;
 555         int core_id = 0;
 556         int i, ret;
 557
 558         /*
 559          * First check for child clusters; we currently ignore any
 560          * information about the nesting of clusters and present the
 561          * scheduler with a flat list of them.
 562          */
 563         i = 0;
 564         do {
 565                 snprintf(name, sizeof(name), "cluster%d", i);
 566                 c = of_get_child_by_name(cluster, name);
 567                 if (c) {
 568                         leaf = false;
 569                         ret = parse_cluster(c, package_id, i, depth + 1);
 570                         if (depth > 0)
 571                                 pr_warn("Topology for clusters of clusters not yet supported\n");
 572                         of_node_put(c);
 573                         if (ret != 0)
 574                                 return ret;
 575                 }
 576                 i++;
 577         } while (c);
 578
 579         /* Now check for cores */
 580         i = 0;
 581         do {
 582                 snprintf(name, sizeof(name), "core%d", i);
 583                 c = of_get_child_by_name(cluster, name);
 584                 if (c) {
 585                         has_cores = true;
 586
 587                         if (depth == 0) {
 588                                 pr_err("%pOF: cpu-map children should be clusters\n",
 589                                        c);
 590                                 of_node_put(c);
 591                                 return -EINVAL;
 592                         }
 593
 594                         if (leaf) {
 595                                 ret = parse_core(c, package_id, cluster_id,
 596                                                  core_id++);
 597                         } else {
 598                                 pr_err("%pOF: Non-leaf cluster with core %s\n",
 599                                        cluster, name);
 600                                 ret = -EINVAL;
 601                         }
 602
 603                         of_node_put(c);
 604                         if (ret != 0)
 605                                 return ret;
 606                 }
 607                 i++;
 608         } while (c);
 609
 610         if (leaf && !has_cores)
 611                 pr_warn("%pOF: empty cluster\n", cluster);
 612
 613         return 0;
 614 }
 615
 616 static int __init parse_socket(struct device_node *socket)
 617 {
 618         char name[20];
 619         struct device_node *c;
 620         bool has_socket = false;
 621         int package_id = 0, ret;
 622
 623         do {
 624                 snprintf(name, sizeof(name), "socket%d", package_id);
 625                 c = of_get_child_by_name(socket, name);
 626                 if (c) {
 627                         has_socket = true;
 628                         ret = parse_cluster(c, package_id, -1, 0);
 629                         of_node_put(c);
 630                         if (ret != 0)
 631                                 return ret;
 632                 }
 633                 package_id++;
 634         } while (c);
 635
 636         if (!has_socket)
 637                 ret = parse_cluster(socket, 0, -1, 0);
 638
 639         return ret;
 640 }
 641
 642 static int __init parse_dt_topology(void)
 643 {
 644         struct device_node *cn, *map;
 645         int ret = 0;
 646         int cpu;
 647
 648         cn = of_find_node_by_path("/cpus");
 649         if (!cn) {
 650                 pr_err("No CPU information found in DT\n");
 651                 return 0;
 652         }
 653
 654         /*
 655          * When topology is provided cpu-map is essentially a root
 656          * cluster with restricted subnodes.
 657          */
 658         map = of_get_child_by_name(cn, "cpu-map");
 659         if (!map)
 660                 goto out;
 661
 662         ret = parse_socket(map);
 663         if (ret != 0)
 664                 goto out_map;
 665
 666         topology_normalize_cpu_scale();
 667
 668         /*
 669          * Check that all cores are in the topology; the SMP code will
 670          * only mark cores described in the DT as possible.
 671          */
 672         for_each_possible_cpu(cpu)
 673                 if (cpu_topology[cpu].package_id < 0) {
 674                         ret = -EINVAL;
 675                         break;
 676                 }
 677
 678 out_map:
 679         of_node_put(map);
 680 out:
 681         of_node_put(cn);
 682         return ret;
 683 }
 684 #endif
 685
 686 /*
 687  * cpu topology table
 688  */
 689 struct cpu_topology cpu_topology[NR_CPUS];
 690 EXPORT_SYMBOL_GPL(cpu_topology);
 691
 692 const struct cpumask *cpu_coregroup_mask(int cpu)
 693 {
 694         const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu));
 695
 696         /* Find the smaller of NUMA, core or LLC siblings */
 697         if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) {
 698                 /* not numa in package, lets use the package siblings */
 699                 core_mask = &cpu_topology[cpu].core_sibling;
 700         }
 701
 702         if (last_level_cache_is_valid(cpu)) {
 703                 if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask))
 704                         core_mask = &cpu_topology[cpu].llc_sibling;
 705         }
 706
 707         /*
 708          * For systems with no shared cpu-side LLC but with clusters defined,
 709          * extend core_mask to cluster_siblings. The sched domain builder will
 710          * then remove MC as redundant with CLS if SCHED_CLUSTER is enabled.
 711          */
 712         if (IS_ENABLED(CONFIG_SCHED_CLUSTER) &&
 713             cpumask_subset(core_mask, &cpu_topology[cpu].cluster_sibling))
 714                 core_mask = &cpu_topology[cpu].cluster_sibling;
 715
 716         return core_mask;
 717 }
 718
 719 const struct cpumask *cpu_clustergroup_mask(int cpu)
 720 {
 721         /*
 722          * Forbid cpu_clustergroup_mask() to span more or the same CPUs as
 723          * cpu_coregroup_mask().
 724          */
 725         if (cpumask_subset(cpu_coregroup_mask(cpu),
 726                            &cpu_topology[cpu].cluster_sibling))
 727                 return get_cpu_mask(cpu);
 728
 729         return &cpu_topology[cpu].cluster_sibling;
 730 }
 731
 732 void update_siblings_masks(unsigned int cpuid)
 733 {
 734         struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
 735         int cpu, ret;
 736
 737         ret = detect_cache_attributes(cpuid);
 738         if (ret)
 739                 pr_info("Early cacheinfo failed, ret = %d\n", ret);
 740
 741         /* update core and thread sibling masks */
 742         for_each_online_cpu(cpu) {
 743                 cpu_topo = &cpu_topology[cpu];
 744
 745                 if (last_level_cache_is_shared(cpu, cpuid)) {
 746                         cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling);
 747                         cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling);
 748                 }
 749
 750                 if (cpuid_topo->package_id != cpu_topo->package_id)
 751                         continue;
 752
 753                 cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
 754                 cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
 755
 756                 if (cpuid_topo->cluster_id != cpu_topo->cluster_id)
 757                         continue;
 758
 759                 if (cpuid_topo->cluster_id >= 0) {
 760                         cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling);
 761                         cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling);
 762                 }
 763
 764                 if (cpuid_topo->core_id != cpu_topo->core_id)
 765                         continue;
 766
 767                 cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
 768                 cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
 769         }
 770 }
 771
 772 static void clear_cpu_topology(int cpu)
 773 {
 774         struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 775
 776         cpumask_clear(&cpu_topo->llc_sibling);
 777         cpumask_set_cpu(cpu, &cpu_topo->llc_sibling);
 778
 779         cpumask_clear(&cpu_topo->cluster_sibling);
 780         cpumask_set_cpu(cpu, &cpu_topo->cluster_sibling);
 781
 782         cpumask_clear(&cpu_topo->core_sibling);
 783         cpumask_set_cpu(cpu, &cpu_topo->core_sibling);
 784         cpumask_clear(&cpu_topo->thread_sibling);
 785         cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
 786 }
 787
 788 void __init reset_cpu_topology(void)
 789 {
 790         unsigned int cpu;
 791
 792         for_each_possible_cpu(cpu) {
 793                 struct cpu_topology *cpu_topo = &cpu_topology[cpu];
 794
 795                 cpu_topo->thread_id = -1;
 796                 cpu_topo->core_id = -1;
 797                 cpu_topo->cluster_id = -1;
 798                 cpu_topo->package_id = -1;
 799
 800                 clear_cpu_topology(cpu);
 801         }
 802 }
 803
 804 void remove_cpu_topology(unsigned int cpu)
 805 {
 806         int sibling;
 807
 808         for_each_cpu(sibling, topology_core_cpumask(cpu))
 809                 cpumask_clear_cpu(cpu, topology_core_cpumask(sibling));
 810         for_each_cpu(sibling, topology_sibling_cpumask(cpu))
 811                 cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
 812         for_each_cpu(sibling, topology_cluster_cpumask(cpu))
 813                 cpumask_clear_cpu(cpu, topology_cluster_cpumask(sibling));
 814         for_each_cpu(sibling, topology_llc_cpumask(cpu))
 815                 cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling));
 816
 817         clear_cpu_topology(cpu);
 818 }
 819
 820 __weak int __init parse_acpi_topology(void)
 821 {
 822         return 0;
 823 }
 824
 825 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 826 void __init init_cpu_topology(void)
 827 {
 828         int ret;
 829
 830         reset_cpu_topology();
 831         ret = parse_acpi_topology();
 832         if (!ret)
 833                 ret = of_have_populated_dt() && parse_dt_topology();
 834
 835         if (ret) {
 836                 /*
 837                  * Discard anything that was parsed if we hit an error so we
 838                  * don't use partial information.
 839                  */
 840                 reset_cpu_topology();
 841                 return;
 842         }
 843 }
 844 #endif