1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Arch specific cpu topology information 4 * 5 * Copyright (C) 2016, ARM Ltd. 6 * Written by: Juri Lelli, ARM Ltd. 7 */ 8 9#include <linux/acpi.h> 10#include <linux/cacheinfo.h> 11#include <linux/cpu.h> 12#include <linux/cpufreq.h> 13#include <linux/device.h> 14#include <linux/of.h> 15#include <linux/slab.h> 16#include <linux/sched/topology.h> 17#include <linux/cpuset.h> 18#include <linux/cpumask.h> 19#include <linux/init.h> 20#include <linux/rcupdate.h> 21#include <linux/sched.h> 22#include <linux/units.h> 23 24#define CREATE_TRACE_POINTS 25#include <trace/events/thermal_pressure.h> 26 27static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data); 28static struct cpumask scale_freq_counters_mask; 29static bool scale_freq_invariant; 30DEFINE_PER_CPU(unsigned long, capacity_freq_ref) = 1; 31EXPORT_PER_CPU_SYMBOL_GPL(capacity_freq_ref); 32 33static bool supports_scale_freq_counters(const struct cpumask *cpus) 34{ 35 return cpumask_subset(cpus, &scale_freq_counters_mask); 36} 37 38bool topology_scale_freq_invariant(void) 39{ 40 return cpufreq_supports_freq_invariance() || 41 supports_scale_freq_counters(cpu_online_mask); 42} 43 44static void update_scale_freq_invariant(bool status) 45{ 46 if (scale_freq_invariant == status) 47 return; 48 49 /* 50 * Task scheduler behavior depends on frequency invariance support, 51 * either cpufreq or counter driven. If the support status changes as 52 * a result of counter initialisation and use, retrigger the build of 53 * scheduling domains to ensure the information is propagated properly. 54 */ 55 if (topology_scale_freq_invariant() == status) { 56 scale_freq_invariant = status; 57 rebuild_sched_domains_energy(); 58 } 59} 60 61void topology_set_scale_freq_source(struct scale_freq_data *data, 62 const struct cpumask *cpus) 63{ 64 struct scale_freq_data *sfd; 65 int cpu; 66 67 /* 68 * Avoid calling rebuild_sched_domains() unnecessarily if FIE is 69 * supported by cpufreq. 70 */ 71 if (cpumask_empty(&scale_freq_counters_mask)) 72 scale_freq_invariant = topology_scale_freq_invariant(); 73 74 rcu_read_lock(); 75 76 for_each_cpu(cpu, cpus) { 77 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu)); 78 79 /* Use ARCH provided counters whenever possible */ 80 if (!sfd || sfd->source != SCALE_FREQ_SOURCE_ARCH) { 81 rcu_assign_pointer(per_cpu(sft_data, cpu), data); 82 cpumask_set_cpu(cpu, &scale_freq_counters_mask); 83 } 84 } 85 86 rcu_read_unlock(); 87 88 update_scale_freq_invariant(true); 89} 90EXPORT_SYMBOL_GPL(topology_set_scale_freq_source); 91 92void topology_clear_scale_freq_source(enum scale_freq_source source, 93 const struct cpumask *cpus) 94{ 95 struct scale_freq_data *sfd; 96 int cpu; 97 98 rcu_read_lock(); 99 100 for_each_cpu(cpu, cpus) { 101 sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu)); 102 103 if (sfd && sfd->source == source) { 104 rcu_assign_pointer(per_cpu(sft_data, cpu), NULL); 105 cpumask_clear_cpu(cpu, &scale_freq_counters_mask); 106 } 107 } 108 109 rcu_read_unlock(); 110 111 /* 112 * Make sure all references to previous sft_data are dropped to avoid 113 * use-after-free races. 114 */ 115 synchronize_rcu(); 116 117 update_scale_freq_invariant(false); 118} 119EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source); 120 121void topology_scale_freq_tick(void) 122{ 123 struct scale_freq_data *sfd = rcu_dereference_sched(*this_cpu_ptr(&sft_data)); 124 125 if (sfd) 126 sfd->set_freq_scale(); 127} 128 129DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE; 130EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale); 131 132void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq, 133 unsigned long max_freq) 134{ 135 unsigned long scale; 136 int i; 137 138 if (WARN_ON_ONCE(!cur_freq || !max_freq)) 139 return; 140 141 /* 142 * If the use of counters for FIE is enabled, just return as we don't 143 * want to update the scale factor with information from CPUFREQ. 144 * Instead the scale factor will be updated from arch_scale_freq_tick. 145 */ 146 if (supports_scale_freq_counters(cpus)) 147 return; 148 149 scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq; 150 151 for_each_cpu(i, cpus) 152 per_cpu(arch_freq_scale, i) = scale; 153} 154 155DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE; 156EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale); 157 158void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity) 159{ 160 per_cpu(cpu_scale, cpu) = capacity; 161} 162 163DEFINE_PER_CPU(unsigned long, thermal_pressure); 164 165/** 166 * topology_update_thermal_pressure() - Update thermal pressure for CPUs 167 * @cpus : The related CPUs for which capacity has been reduced 168 * @capped_freq : The maximum allowed frequency that CPUs can run at 169 * 170 * Update the value of thermal pressure for all @cpus in the mask. The 171 * cpumask should include all (online+offline) affected CPUs, to avoid 172 * operating on stale data when hot-plug is used for some CPUs. The 173 * @capped_freq reflects the currently allowed max CPUs frequency due to 174 * thermal capping. It might be also a boost frequency value, which is bigger 175 * than the internal 'capacity_freq_ref' max frequency. In such case the 176 * pressure value should simply be removed, since this is an indication that 177 * there is no thermal throttling. The @capped_freq must be provided in kHz. 178 */ 179void topology_update_thermal_pressure(const struct cpumask *cpus, 180 unsigned long capped_freq) 181{ 182 unsigned long max_capacity, capacity, th_pressure; 183 u32 max_freq; 184 int cpu; 185 186 cpu = cpumask_first(cpus); 187 max_capacity = arch_scale_cpu_capacity(cpu); 188 max_freq = arch_scale_freq_ref(cpu); 189 190 /* 191 * Handle properly the boost frequencies, which should simply clean 192 * the thermal pressure value. 193 */ 194 if (max_freq <= capped_freq) 195 capacity = max_capacity; 196 else 197 capacity = mult_frac(max_capacity, capped_freq, max_freq); 198 199 th_pressure = max_capacity - capacity; 200 201 trace_thermal_pressure_update(cpu, th_pressure); 202 203 for_each_cpu(cpu, cpus) 204 WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure); 205} 206EXPORT_SYMBOL_GPL(topology_update_thermal_pressure); 207 208static ssize_t cpu_capacity_show(struct device *dev, 209 struct device_attribute *attr, 210 char *buf) 211{ 212 struct cpu *cpu = container_of(dev, struct cpu, dev); 213 214 return sysfs_emit(buf, "%lu\n", topology_get_cpu_scale(cpu->dev.id)); 215} 216 217static void update_topology_flags_workfn(struct work_struct *work); 218static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn); 219 220static DEVICE_ATTR_RO(cpu_capacity); 221 222static int cpu_capacity_sysctl_add(unsigned int cpu) 223{ 224 struct device *cpu_dev = get_cpu_device(cpu); 225 226 if (!cpu_dev) 227 return -ENOENT; 228 229 device_create_file(cpu_dev, &dev_attr_cpu_capacity); 230 231 return 0; 232} 233 234static int cpu_capacity_sysctl_remove(unsigned int cpu) 235{ 236 struct device *cpu_dev = get_cpu_device(cpu); 237 238 if (!cpu_dev) 239 return -ENOENT; 240 241 device_remove_file(cpu_dev, &dev_attr_cpu_capacity); 242 243 return 0; 244} 245 246static int register_cpu_capacity_sysctl(void) 247{ 248 cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "topology/cpu-capacity", 249 cpu_capacity_sysctl_add, cpu_capacity_sysctl_remove); 250 251 return 0; 252} 253subsys_initcall(register_cpu_capacity_sysctl); 254 255static int update_topology; 256 257int topology_update_cpu_topology(void) 258{ 259 return update_topology; 260} 261 262/* 263 * Updating the sched_domains can't be done directly from cpufreq callbacks 264 * due to locking, so queue the work for later. 265 */ 266static void update_topology_flags_workfn(struct work_struct *work) 267{ 268 update_topology = 1; 269 rebuild_sched_domains(); 270 pr_debug("sched_domain hierarchy rebuilt, flags updated\n"); 271 update_topology = 0; 272} 273 274static u32 *raw_capacity; 275 276static int free_raw_capacity(void) 277{ 278 kfree(raw_capacity); 279 raw_capacity = NULL; 280 281 return 0; 282} 283 284void topology_normalize_cpu_scale(void) 285{ 286 u64 capacity; 287 u64 capacity_scale; 288 int cpu; 289 290 if (!raw_capacity) 291 return; 292 293 capacity_scale = 1; 294 for_each_possible_cpu(cpu) { 295 capacity = raw_capacity[cpu] * per_cpu(capacity_freq_ref, cpu); 296 capacity_scale = max(capacity, capacity_scale); 297 } 298 299 pr_debug("cpu_capacity: capacity_scale=%llu\n", capacity_scale); 300 for_each_possible_cpu(cpu) { 301 capacity = raw_capacity[cpu] * per_cpu(capacity_freq_ref, cpu); 302 capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT, 303 capacity_scale); 304 topology_set_cpu_scale(cpu, capacity); 305 pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n", 306 cpu, topology_get_cpu_scale(cpu)); 307 } 308} 309 310bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu) 311{ 312 struct clk *cpu_clk; 313 static bool cap_parsing_failed; 314 int ret; 315 u32 cpu_capacity; 316 317 if (cap_parsing_failed) 318 return false; 319 320 ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz", 321 &cpu_capacity); 322 if (!ret) { 323 if (!raw_capacity) { 324 raw_capacity = kcalloc(num_possible_cpus(), 325 sizeof(*raw_capacity), 326 GFP_KERNEL); 327 if (!raw_capacity) { 328 cap_parsing_failed = true; 329 return false; 330 } 331 } 332 raw_capacity[cpu] = cpu_capacity; 333 pr_debug("cpu_capacity: %pOF cpu_capacity=%u (raw)\n", 334 cpu_node, raw_capacity[cpu]); 335 336 /* 337 * Update capacity_freq_ref for calculating early boot CPU capacities. 338 * For non-clk CPU DVFS mechanism, there's no way to get the 339 * frequency value now, assuming they are running at the same 340 * frequency (by keeping the initial capacity_freq_ref value). 341 */ 342 cpu_clk = of_clk_get(cpu_node, 0); 343 if (!PTR_ERR_OR_ZERO(cpu_clk)) { 344 per_cpu(capacity_freq_ref, cpu) = 345 clk_get_rate(cpu_clk) / HZ_PER_KHZ; 346 clk_put(cpu_clk); 347 } 348 } else { 349 if (raw_capacity) { 350 pr_err("cpu_capacity: missing %pOF raw capacity\n", 351 cpu_node); 352 pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n"); 353 } 354 cap_parsing_failed = true; 355 free_raw_capacity(); 356 } 357 358 return !ret; 359} 360 361void __weak freq_inv_set_max_ratio(int cpu, u64 max_rate) 362{ 363} 364 365#ifdef CONFIG_ACPI_CPPC_LIB 366#include <acpi/cppc_acpi.h> 367 368void topology_init_cpu_capacity_cppc(void) 369{ 370 u64 capacity, capacity_scale = 0; 371 struct cppc_perf_caps perf_caps; 372 int cpu; 373 374 if (likely(!acpi_cpc_valid())) 375 return; 376 377 raw_capacity = kcalloc(num_possible_cpus(), sizeof(*raw_capacity), 378 GFP_KERNEL); 379 if (!raw_capacity) 380 return; 381 382 for_each_possible_cpu(cpu) { 383 if (!cppc_get_perf_caps(cpu, &perf_caps) && 384 (perf_caps.highest_perf >= perf_caps.nominal_perf) && 385 (perf_caps.highest_perf >= perf_caps.lowest_perf)) { 386 raw_capacity[cpu] = perf_caps.highest_perf; 387 capacity_scale = max_t(u64, capacity_scale, raw_capacity[cpu]); 388 389 per_cpu(capacity_freq_ref, cpu) = cppc_perf_to_khz(&perf_caps, raw_capacity[cpu]); 390 391 pr_debug("cpu_capacity: CPU%d cpu_capacity=%u (raw).\n", 392 cpu, raw_capacity[cpu]); 393 continue; 394 } 395 396 pr_err("cpu_capacity: CPU%d missing/invalid highest performance.\n", cpu); 397 pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n"); 398 goto exit; 399 } 400 401 for_each_possible_cpu(cpu) { 402 freq_inv_set_max_ratio(cpu, 403 per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ); 404 405 capacity = raw_capacity[cpu]; 406 capacity = div64_u64(capacity << SCHED_CAPACITY_SHIFT, 407 capacity_scale); 408 topology_set_cpu_scale(cpu, capacity); 409 pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n", 410 cpu, topology_get_cpu_scale(cpu)); 411 } 412 413 schedule_work(&update_topology_flags_work); 414 pr_debug("cpu_capacity: cpu_capacity initialization done\n"); 415 416exit: 417 free_raw_capacity(); 418} 419#endif 420 421#ifdef CONFIG_CPU_FREQ 422static cpumask_var_t cpus_to_visit; 423static void parsing_done_workfn(struct work_struct *work); 424static DECLARE_WORK(parsing_done_work, parsing_done_workfn); 425 426static int 427init_cpu_capacity_callback(struct notifier_block *nb, 428 unsigned long val, 429 void *data) 430{ 431 struct cpufreq_policy *policy = data; 432 int cpu; 433 434 if (val != CPUFREQ_CREATE_POLICY) 435 return 0; 436 437 pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n", 438 cpumask_pr_args(policy->related_cpus), 439 cpumask_pr_args(cpus_to_visit)); 440 441 cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus); 442 443 for_each_cpu(cpu, policy->related_cpus) { 444 per_cpu(capacity_freq_ref, cpu) = policy->cpuinfo.max_freq; 445 freq_inv_set_max_ratio(cpu, 446 per_cpu(capacity_freq_ref, cpu) * HZ_PER_KHZ); 447 } 448 449 if (cpumask_empty(cpus_to_visit)) { 450 if (raw_capacity) { 451 topology_normalize_cpu_scale(); 452 schedule_work(&update_topology_flags_work); 453 free_raw_capacity(); 454 } 455 pr_debug("cpu_capacity: parsing done\n"); 456 schedule_work(&parsing_done_work); 457 } 458 459 return 0; 460} 461 462static struct notifier_block init_cpu_capacity_notifier = { 463 .notifier_call = init_cpu_capacity_callback, 464}; 465 466static int __init register_cpufreq_notifier(void) 467{ 468 int ret; 469 470 /* 471 * On ACPI-based systems skip registering cpufreq notifier as cpufreq 472 * information is not needed for cpu capacity initialization. 473 */ 474 if (!acpi_disabled) 475 return -EINVAL; 476 477 if (!alloc_cpumask_var(&cpus_to_visit, GFP_KERNEL)) 478 return -ENOMEM; 479 480 cpumask_copy(cpus_to_visit, cpu_possible_mask); 481 482 ret = cpufreq_register_notifier(&init_cpu_capacity_notifier, 483 CPUFREQ_POLICY_NOTIFIER); 484 485 if (ret) 486 free_cpumask_var(cpus_to_visit); 487 488 return ret; 489} 490core_initcall(register_cpufreq_notifier); 491 492static void parsing_done_workfn(struct work_struct *work) 493{ 494 cpufreq_unregister_notifier(&init_cpu_capacity_notifier, 495 CPUFREQ_POLICY_NOTIFIER); 496 free_cpumask_var(cpus_to_visit); 497} 498 499#else 500core_initcall(free_raw_capacity); 501#endif 502 503#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) 504/* 505 * This function returns the logic cpu number of the node. 506 * There are basically three kinds of return values: 507 * (1) logic cpu number which is > 0. 508 * (2) -ENODEV when the device tree(DT) node is valid and found in the DT but 509 * there is no possible logical CPU in the kernel to match. This happens 510 * when CONFIG_NR_CPUS is configure to be smaller than the number of 511 * CPU nodes in DT. We need to just ignore this case. 512 * (3) -1 if the node does not exist in the device tree 513 */ 514static int __init get_cpu_for_node(struct device_node *node) 515{ 516 struct device_node *cpu_node; 517 int cpu; 518 519 cpu_node = of_parse_phandle(node, "cpu", 0); 520 if (!cpu_node) 521 return -1; 522 523 cpu = of_cpu_node_to_id(cpu_node); 524 if (cpu >= 0) 525 topology_parse_cpu_capacity(cpu_node, cpu); 526 else 527 pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n", 528 cpu_node, cpumask_pr_args(cpu_possible_mask)); 529 530 of_node_put(cpu_node); 531 return cpu; 532} 533 534static int __init parse_core(struct device_node *core, int package_id, 535 int cluster_id, int core_id) 536{ 537 char name[20]; 538 bool leaf = true; 539 int i = 0; 540 int cpu; 541 struct device_node *t; 542 543 do { 544 snprintf(name, sizeof(name), "thread%d", i); 545 t = of_get_child_by_name(core, name); 546 if (t) { 547 leaf = false; 548 cpu = get_cpu_for_node(t); 549 if (cpu >= 0) { 550 cpu_topology[cpu].package_id = package_id; 551 cpu_topology[cpu].cluster_id = cluster_id; 552 cpu_topology[cpu].core_id = core_id; 553 cpu_topology[cpu].thread_id = i; 554 } else if (cpu != -ENODEV) { 555 pr_err("%pOF: Can't get CPU for thread\n", t); 556 of_node_put(t); 557 return -EINVAL; 558 } 559 of_node_put(t); 560 } 561 i++; 562 } while (t); 563 564 cpu = get_cpu_for_node(core); 565 if (cpu >= 0) { 566 if (!leaf) { 567 pr_err("%pOF: Core has both threads and CPU\n", 568 core); 569 return -EINVAL; 570 } 571 572 cpu_topology[cpu].package_id = package_id; 573 cpu_topology[cpu].cluster_id = cluster_id; 574 cpu_topology[cpu].core_id = core_id; 575 } else if (leaf && cpu != -ENODEV) { 576 pr_err("%pOF: Can't get CPU for leaf core\n", core); 577 return -EINVAL; 578 } 579 580 return 0; 581} 582 583static int __init parse_cluster(struct device_node *cluster, int package_id, 584 int cluster_id, int depth) 585{ 586 char name[20]; 587 bool leaf = true; 588 bool has_cores = false; 589 struct device_node *c; 590 int core_id = 0; 591 int i, ret; 592 593 /* 594 * First check for child clusters; we currently ignore any 595 * information about the nesting of clusters and present the 596 * scheduler with a flat list of them. 597 */ 598 i = 0; 599 do { 600 snprintf(name, sizeof(name), "cluster%d", i); 601 c = of_get_child_by_name(cluster, name); 602 if (c) { 603 leaf = false; 604 ret = parse_cluster(c, package_id, i, depth + 1); 605 if (depth > 0) 606 pr_warn("Topology for clusters of clusters not yet supported\n"); 607 of_node_put(c); 608 if (ret != 0) 609 return ret; 610 } 611 i++; 612 } while (c); 613 614 /* Now check for cores */ 615 i = 0; 616 do { 617 snprintf(name, sizeof(name), "core%d", i); 618 c = of_get_child_by_name(cluster, name); 619 if (c) { 620 has_cores = true; 621 622 if (depth == 0) { 623 pr_err("%pOF: cpu-map children should be clusters\n", 624 c); 625 of_node_put(c); 626 return -EINVAL; 627 } 628 629 if (leaf) { 630 ret = parse_core(c, package_id, cluster_id, 631 core_id++); 632 } else { 633 pr_err("%pOF: Non-leaf cluster with core %s\n", 634 cluster, name); 635 ret = -EINVAL; 636 } 637 638 of_node_put(c); 639 if (ret != 0) 640 return ret; 641 } 642 i++; 643 } while (c); 644 645 if (leaf && !has_cores) 646 pr_warn("%pOF: empty cluster\n", cluster); 647 648 return 0; 649} 650 651static int __init parse_socket(struct device_node *socket) 652{ 653 char name[20]; 654 struct device_node *c; 655 bool has_socket = false; 656 int package_id = 0, ret; 657 658 do { 659 snprintf(name, sizeof(name), "socket%d", package_id); 660 c = of_get_child_by_name(socket, name); 661 if (c) { 662 has_socket = true; 663 ret = parse_cluster(c, package_id, -1, 0); 664 of_node_put(c); 665 if (ret != 0) 666 return ret; 667 } 668 package_id++; 669 } while (c); 670 671 if (!has_socket) 672 ret = parse_cluster(socket, 0, -1, 0); 673 674 return ret; 675} 676 677static int __init parse_dt_topology(void) 678{ 679 struct device_node *cn, *map; 680 int ret = 0; 681 int cpu; 682 683 cn = of_find_node_by_path("/cpus"); 684 if (!cn) { 685 pr_err("No CPU information found in DT\n"); 686 return 0; 687 } 688 689 /* 690 * When topology is provided cpu-map is essentially a root 691 * cluster with restricted subnodes. 692 */ 693 map = of_get_child_by_name(cn, "cpu-map"); 694 if (!map) 695 goto out; 696 697 ret = parse_socket(map); 698 if (ret != 0) 699 goto out_map; 700 701 topology_normalize_cpu_scale(); 702 703 /* 704 * Check that all cores are in the topology; the SMP code will 705 * only mark cores described in the DT as possible. 706 */ 707 for_each_possible_cpu(cpu) 708 if (cpu_topology[cpu].package_id < 0) { 709 ret = -EINVAL; 710 break; 711 } 712 713out_map: 714 of_node_put(map); 715out: 716 of_node_put(cn); 717 return ret; 718} 719#endif 720 721/* 722 * cpu topology table 723 */ 724struct cpu_topology cpu_topology[NR_CPUS]; 725EXPORT_SYMBOL_GPL(cpu_topology); 726 727const struct cpumask *cpu_coregroup_mask(int cpu) 728{ 729 const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu)); 730 731 /* Find the smaller of NUMA, core or LLC siblings */ 732 if (cpumask_subset(&cpu_topology[cpu].core_sibling, core_mask)) { 733 /* not numa in package, lets use the package siblings */ 734 core_mask = &cpu_topology[cpu].core_sibling; 735 } 736 737 if (last_level_cache_is_valid(cpu)) { 738 if (cpumask_subset(&cpu_topology[cpu].llc_sibling, core_mask)) 739 core_mask = &cpu_topology[cpu].llc_sibling; 740 } 741 742 /* 743 * For systems with no shared cpu-side LLC but with clusters defined, 744 * extend core_mask to cluster_siblings. The sched domain builder will 745 * then remove MC as redundant with CLS if SCHED_CLUSTER is enabled. 746 */ 747 if (IS_ENABLED(CONFIG_SCHED_CLUSTER) && 748 cpumask_subset(core_mask, &cpu_topology[cpu].cluster_sibling)) 749 core_mask = &cpu_topology[cpu].cluster_sibling; 750 751 return core_mask; 752} 753 754const struct cpumask *cpu_clustergroup_mask(int cpu) 755{ 756 /* 757 * Forbid cpu_clustergroup_mask() to span more or the same CPUs as 758 * cpu_coregroup_mask(). 759 */ 760 if (cpumask_subset(cpu_coregroup_mask(cpu), 761 &cpu_topology[cpu].cluster_sibling)) 762 return topology_sibling_cpumask(cpu); 763 764 return &cpu_topology[cpu].cluster_sibling; 765} 766 767void update_siblings_masks(unsigned int cpuid) 768{ 769 struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid]; 770 int cpu, ret; 771 772 ret = detect_cache_attributes(cpuid); 773 if (ret && ret != -ENOENT) 774 pr_info("Early cacheinfo allocation failed, ret = %d\n", ret); 775 776 /* update core and thread sibling masks */ 777 for_each_online_cpu(cpu) { 778 cpu_topo = &cpu_topology[cpu]; 779 780 if (last_level_cache_is_shared(cpu, cpuid)) { 781 cpumask_set_cpu(cpu, &cpuid_topo->llc_sibling); 782 cpumask_set_cpu(cpuid, &cpu_topo->llc_sibling); 783 } 784 785 if (cpuid_topo->package_id != cpu_topo->package_id) 786 continue; 787 788 cpumask_set_cpu(cpuid, &cpu_topo->core_sibling); 789 cpumask_set_cpu(cpu, &cpuid_topo->core_sibling); 790 791 if (cpuid_topo->cluster_id != cpu_topo->cluster_id) 792 continue; 793 794 if (cpuid_topo->cluster_id >= 0) { 795 cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling); 796 cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling); 797 } 798 799 if (cpuid_topo->core_id != cpu_topo->core_id) 800 continue; 801 802 cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling); 803 cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling); 804 } 805} 806 807static void clear_cpu_topology(int cpu) 808{ 809 struct cpu_topology *cpu_topo = &cpu_topology[cpu]; 810 811 cpumask_clear(&cpu_topo->llc_sibling); 812 cpumask_set_cpu(cpu, &cpu_topo->llc_sibling); 813 814 cpumask_clear(&cpu_topo->cluster_sibling); 815 cpumask_set_cpu(cpu, &cpu_topo->cluster_sibling); 816 817 cpumask_clear(&cpu_topo->core_sibling); 818 cpumask_set_cpu(cpu, &cpu_topo->core_sibling); 819 cpumask_clear(&cpu_topo->thread_sibling); 820 cpumask_set_cpu(cpu, &cpu_topo->thread_sibling); 821} 822 823void __init reset_cpu_topology(void) 824{ 825 unsigned int cpu; 826 827 for_each_possible_cpu(cpu) { 828 struct cpu_topology *cpu_topo = &cpu_topology[cpu]; 829 830 cpu_topo->thread_id = -1; 831 cpu_topo->core_id = -1; 832 cpu_topo->cluster_id = -1; 833 cpu_topo->package_id = -1; 834 835 clear_cpu_topology(cpu); 836 } 837} 838 839void remove_cpu_topology(unsigned int cpu) 840{ 841 int sibling; 842 843 for_each_cpu(sibling, topology_core_cpumask(cpu)) 844 cpumask_clear_cpu(cpu, topology_core_cpumask(sibling)); 845 for_each_cpu(sibling, topology_sibling_cpumask(cpu)) 846 cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling)); 847 for_each_cpu(sibling, topology_cluster_cpumask(cpu)) 848 cpumask_clear_cpu(cpu, topology_cluster_cpumask(sibling)); 849 for_each_cpu(sibling, topology_llc_cpumask(cpu)) 850 cpumask_clear_cpu(cpu, topology_llc_cpumask(sibling)); 851 852 clear_cpu_topology(cpu); 853} 854 855__weak int __init parse_acpi_topology(void) 856{ 857 return 0; 858} 859 860#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) 861void __init init_cpu_topology(void) 862{ 863 int cpu, ret; 864 865 reset_cpu_topology(); 866 ret = parse_acpi_topology(); 867 if (!ret) 868 ret = of_have_populated_dt() && parse_dt_topology(); 869 870 if (ret) { 871 /* 872 * Discard anything that was parsed if we hit an error so we 873 * don't use partial information. But do not return yet to give 874 * arch-specific early cache level detection a chance to run. 875 */ 876 reset_cpu_topology(); 877 } 878 879 for_each_possible_cpu(cpu) { 880 ret = fetch_cache_info(cpu); 881 if (!ret) 882 continue; 883 else if (ret != -ENOENT) 884 pr_err("Early cacheinfo failed, ret = %d\n", ret); 885 return; 886 } 887} 888 889void store_cpu_topology(unsigned int cpuid) 890{ 891 struct cpu_topology *cpuid_topo = &cpu_topology[cpuid]; 892 893 if (cpuid_topo->package_id != -1) 894 goto topology_populated; 895 896 cpuid_topo->thread_id = -1; 897 cpuid_topo->core_id = cpuid; 898 cpuid_topo->package_id = cpu_to_node(cpuid); 899 900 pr_debug("CPU%u: package %d core %d thread %d\n", 901 cpuid, cpuid_topo->package_id, cpuid_topo->core_id, 902 cpuid_topo->thread_id); 903 904topology_populated: 905 update_siblings_masks(cpuid); 906} 907#endif 908