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 | |
27 | static DEFINE_PER_CPU(struct scale_freq_data __rcu *, sft_data); |
28 | static struct cpumask scale_freq_counters_mask; |
29 | static bool scale_freq_invariant; |
30 | DEFINE_PER_CPU(unsigned long, capacity_freq_ref) = 1; |
31 | EXPORT_PER_CPU_SYMBOL_GPL(capacity_freq_ref); |
32 | |
33 | static bool supports_scale_freq_counters(const struct cpumask *cpus) |
34 | { |
35 | return cpumask_subset(src1p: cpus, src2p: &scale_freq_counters_mask); |
36 | } |
37 | |
38 | bool topology_scale_freq_invariant(void) |
39 | { |
40 | return cpufreq_supports_freq_invariance() || |
41 | supports_scale_freq_counters(cpu_online_mask); |
42 | } |
43 | |
44 | static void update_scale_freq_invariant(bool status) |
45 | { |
46 | if (scale_freq_invariant == status) |
47 | return; |
48 | |
49 | /* |
50 | * Task scheduler behavior depends on frequency invariance support, |
51 | * either cpufreq or counter driven. If the support status changes as |
52 | * a result of counter initialisation and use, retrigger the build of |
53 | * scheduling domains to ensure the information is propagated properly. |
54 | */ |
55 | if (topology_scale_freq_invariant() == status) { |
56 | scale_freq_invariant = status; |
57 | rebuild_sched_domains_energy(); |
58 | } |
59 | } |
60 | |
61 | void topology_set_scale_freq_source(struct scale_freq_data *data, |
62 | const struct cpumask *cpus) |
63 | { |
64 | struct scale_freq_data *sfd; |
65 | int cpu; |
66 | |
67 | /* |
68 | * Avoid calling rebuild_sched_domains() unnecessarily if FIE is |
69 | * supported by cpufreq. |
70 | */ |
71 | if (cpumask_empty(srcp: &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, dstp: &scale_freq_counters_mask); |
83 | } |
84 | } |
85 | |
86 | rcu_read_unlock(); |
87 | |
88 | update_scale_freq_invariant(status: true); |
89 | } |
90 | EXPORT_SYMBOL_GPL(topology_set_scale_freq_source); |
91 | |
92 | void topology_clear_scale_freq_source(enum scale_freq_source source, |
93 | const struct cpumask *cpus) |
94 | { |
95 | struct scale_freq_data *sfd; |
96 | int cpu; |
97 | |
98 | rcu_read_lock(); |
99 | |
100 | for_each_cpu(cpu, cpus) { |
101 | sfd = rcu_dereference(*per_cpu_ptr(&sft_data, cpu)); |
102 | |
103 | if (sfd && sfd->source == source) { |
104 | rcu_assign_pointer(per_cpu(sft_data, cpu), NULL); |
105 | cpumask_clear_cpu(cpu, dstp: &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(status: false); |
118 | } |
119 | EXPORT_SYMBOL_GPL(topology_clear_scale_freq_source); |
120 | |
121 | void topology_scale_freq_tick(void) |
122 | { |
123 | struct scale_freq_data *sfd = rcu_dereference_sched(*this_cpu_ptr(&sft_data)); |
124 | |
125 | if (sfd) |
126 | sfd->set_freq_scale(); |
127 | } |
128 | |
129 | DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE; |
130 | EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale); |
131 | |
132 | void topology_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq, |
133 | unsigned long max_freq) |
134 | { |
135 | unsigned long scale; |
136 | int i; |
137 | |
138 | if (WARN_ON_ONCE(!cur_freq || !max_freq)) |
139 | return; |
140 | |
141 | /* |
142 | * If the use of counters for FIE is enabled, just return as we don't |
143 | * want to update the scale factor with information from CPUFREQ. |
144 | * Instead the scale factor will be updated from arch_scale_freq_tick. |
145 | */ |
146 | if (supports_scale_freq_counters(cpus)) |
147 | return; |
148 | |
149 | scale = (cur_freq << SCHED_CAPACITY_SHIFT) / max_freq; |
150 | |
151 | for_each_cpu(i, cpus) |
152 | per_cpu(arch_freq_scale, i) = scale; |
153 | } |
154 | |
155 | DEFINE_PER_CPU(unsigned long, cpu_scale) = SCHED_CAPACITY_SCALE; |
156 | EXPORT_PER_CPU_SYMBOL_GPL(cpu_scale); |
157 | |
158 | void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity) |
159 | { |
160 | per_cpu(cpu_scale, cpu) = capacity; |
161 | } |
162 | |
163 | DEFINE_PER_CPU(unsigned long, 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 | */ |
179 | void 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(srcp: 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, thermal_pressure: th_pressure); |
202 | |
203 | for_each_cpu(cpu, cpus) |
204 | WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure); |
205 | } |
206 | EXPORT_SYMBOL_GPL(topology_update_thermal_pressure); |
207 | |
208 | static ssize_t cpu_capacity_show(struct device *dev, |
209 | struct device_attribute *attr, |
210 | char *buf) |
211 | { |
212 | struct cpu *cpu = container_of(dev, struct cpu, dev); |
213 | |
214 | return sysfs_emit(buf, fmt: "%lu\n" , topology_get_cpu_scale(cpu: cpu->dev.id)); |
215 | } |
216 | |
217 | static void update_topology_flags_workfn(struct work_struct *work); |
218 | static DECLARE_WORK(update_topology_flags_work, update_topology_flags_workfn); |
219 | |
220 | static DEVICE_ATTR_RO(cpu_capacity); |
221 | |
222 | static int cpu_capacity_sysctl_add(unsigned int cpu) |
223 | { |
224 | struct device *cpu_dev = get_cpu_device(cpu); |
225 | |
226 | if (!cpu_dev) |
227 | return -ENOENT; |
228 | |
229 | device_create_file(device: cpu_dev, entry: &dev_attr_cpu_capacity); |
230 | |
231 | return 0; |
232 | } |
233 | |
234 | static int cpu_capacity_sysctl_remove(unsigned int cpu) |
235 | { |
236 | struct device *cpu_dev = get_cpu_device(cpu); |
237 | |
238 | if (!cpu_dev) |
239 | return -ENOENT; |
240 | |
241 | device_remove_file(dev: cpu_dev, attr: &dev_attr_cpu_capacity); |
242 | |
243 | return 0; |
244 | } |
245 | |
246 | static int register_cpu_capacity_sysctl(void) |
247 | { |
248 | cpuhp_setup_state(state: CPUHP_AP_ONLINE_DYN, name: "topology/cpu-capacity" , |
249 | startup: cpu_capacity_sysctl_add, teardown: cpu_capacity_sysctl_remove); |
250 | |
251 | return 0; |
252 | } |
253 | subsys_initcall(register_cpu_capacity_sysctl); |
254 | |
255 | static int update_topology; |
256 | |
257 | int topology_update_cpu_topology(void) |
258 | { |
259 | return update_topology; |
260 | } |
261 | |
262 | /* |
263 | * Updating the sched_domains can't be done directly from cpufreq callbacks |
264 | * due to locking, so queue the work for later. |
265 | */ |
266 | static void update_topology_flags_workfn(struct work_struct *work) |
267 | { |
268 | update_topology = 1; |
269 | rebuild_sched_domains(); |
270 | pr_debug("sched_domain hierarchy rebuilt, flags updated\n" ); |
271 | update_topology = 0; |
272 | } |
273 | |
274 | static u32 *raw_capacity; |
275 | |
276 | static int free_raw_capacity(void) |
277 | { |
278 | kfree(objp: raw_capacity); |
279 | raw_capacity = NULL; |
280 | |
281 | return 0; |
282 | } |
283 | |
284 | void topology_normalize_cpu_scale(void) |
285 | { |
286 | u64 capacity; |
287 | u64 capacity_scale; |
288 | int cpu; |
289 | |
290 | if (!raw_capacity) |
291 | return; |
292 | |
293 | capacity_scale = 1; |
294 | for_each_possible_cpu(cpu) { |
295 | capacity = raw_capacity[cpu] * per_cpu(capacity_freq_ref, cpu); |
296 | capacity_scale = max(capacity, capacity_scale); |
297 | } |
298 | |
299 | pr_debug("cpu_capacity: capacity_scale=%llu\n" , capacity_scale); |
300 | for_each_possible_cpu(cpu) { |
301 | capacity = raw_capacity[cpu] * per_cpu(capacity_freq_ref, cpu); |
302 | capacity = div64_u64(dividend: capacity << SCHED_CAPACITY_SHIFT, |
303 | divisor: capacity_scale); |
304 | topology_set_cpu_scale(cpu, capacity); |
305 | pr_debug("cpu_capacity: CPU%d cpu_capacity=%lu\n" , |
306 | cpu, topology_get_cpu_scale(cpu)); |
307 | } |
308 | } |
309 | |
310 | bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu) |
311 | { |
312 | struct clk *cpu_clk; |
313 | static bool cap_parsing_failed; |
314 | int ret; |
315 | u32 cpu_capacity; |
316 | |
317 | if (cap_parsing_failed) |
318 | return false; |
319 | |
320 | ret = of_property_read_u32(np: cpu_node, propname: "capacity-dmips-mhz" , |
321 | out_value: &cpu_capacity); |
322 | if (!ret) { |
323 | if (!raw_capacity) { |
324 | raw_capacity = kcalloc(num_possible_cpus(), |
325 | size: 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(np: cpu_node, index: 0); |
343 | if (!PTR_ERR_OR_ZERO(ptr: cpu_clk)) { |
344 | per_cpu(capacity_freq_ref, cpu) = |
345 | clk_get_rate(clk: cpu_clk) / HZ_PER_KHZ; |
346 | clk_put(clk: cpu_clk); |
347 | } |
348 | } else { |
349 | if (raw_capacity) { |
350 | pr_err("cpu_capacity: missing %pOF raw capacity\n" , |
351 | cpu_node); |
352 | pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n" ); |
353 | } |
354 | cap_parsing_failed = true; |
355 | free_raw_capacity(); |
356 | } |
357 | |
358 | return !ret; |
359 | } |
360 | |
361 | void __weak freq_inv_set_max_ratio(int cpu, u64 max_rate) |
362 | { |
363 | } |
364 | |
365 | #ifdef CONFIG_ACPI_CPPC_LIB |
366 | #include <acpi/cppc_acpi.h> |
367 | |
368 | void topology_init_cpu_capacity_cppc(void) |
369 | { |
370 | u64 capacity, capacity_scale = 0; |
371 | struct cppc_perf_caps perf_caps; |
372 | int cpu; |
373 | |
374 | if (likely(!acpi_cpc_valid())) |
375 | return; |
376 | |
377 | raw_capacity = kcalloc(num_possible_cpus(), size: 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, caps: &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(caps: &perf_caps, perf: 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(dividend: capacity << SCHED_CAPACITY_SHIFT, |
407 | divisor: 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(work: &update_topology_flags_work); |
414 | pr_debug("cpu_capacity: cpu_capacity initialization done\n" ); |
415 | |
416 | exit: |
417 | free_raw_capacity(); |
418 | } |
419 | #endif |
420 | |
421 | #ifdef CONFIG_CPU_FREQ |
422 | static cpumask_var_t cpus_to_visit; |
423 | static void parsing_done_workfn(struct work_struct *work); |
424 | static DECLARE_WORK(parsing_done_work, parsing_done_workfn); |
425 | |
426 | static int |
427 | init_cpu_capacity_callback(struct notifier_block *nb, |
428 | unsigned long val, |
429 | void *data) |
430 | { |
431 | struct cpufreq_policy *policy = data; |
432 | int cpu; |
433 | |
434 | if (val != CPUFREQ_CREATE_POLICY) |
435 | return 0; |
436 | |
437 | pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n" , |
438 | cpumask_pr_args(policy->related_cpus), |
439 | cpumask_pr_args(cpus_to_visit)); |
440 | |
441 | cpumask_andnot(dstp: cpus_to_visit, src1p: cpus_to_visit, src2p: 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(srcp: cpus_to_visit)) { |
450 | if (raw_capacity) { |
451 | topology_normalize_cpu_scale(); |
452 | schedule_work(work: &update_topology_flags_work); |
453 | free_raw_capacity(); |
454 | } |
455 | pr_debug("cpu_capacity: parsing done\n" ); |
456 | schedule_work(work: &parsing_done_work); |
457 | } |
458 | |
459 | return 0; |
460 | } |
461 | |
462 | static struct notifier_block init_cpu_capacity_notifier = { |
463 | .notifier_call = init_cpu_capacity_callback, |
464 | }; |
465 | |
466 | static int __init register_cpufreq_notifier(void) |
467 | { |
468 | int ret; |
469 | |
470 | /* |
471 | * On ACPI-based systems skip registering cpufreq notifier as cpufreq |
472 | * information is not needed for cpu capacity initialization. |
473 | */ |
474 | if (!acpi_disabled) |
475 | return -EINVAL; |
476 | |
477 | if (!alloc_cpumask_var(mask: &cpus_to_visit, GFP_KERNEL)) |
478 | return -ENOMEM; |
479 | |
480 | cpumask_copy(dstp: cpus_to_visit, cpu_possible_mask); |
481 | |
482 | ret = cpufreq_register_notifier(nb: &init_cpu_capacity_notifier, |
483 | CPUFREQ_POLICY_NOTIFIER); |
484 | |
485 | if (ret) |
486 | free_cpumask_var(mask: cpus_to_visit); |
487 | |
488 | return ret; |
489 | } |
490 | core_initcall(register_cpufreq_notifier); |
491 | |
492 | static void parsing_done_workfn(struct work_struct *work) |
493 | { |
494 | cpufreq_unregister_notifier(nb: &init_cpu_capacity_notifier, |
495 | CPUFREQ_POLICY_NOTIFIER); |
496 | free_cpumask_var(mask: cpus_to_visit); |
497 | } |
498 | |
499 | #else |
500 | core_initcall(free_raw_capacity); |
501 | #endif |
502 | |
503 | #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) |
504 | /* |
505 | * This function returns the logic cpu number of the node. |
506 | * There are basically three kinds of return values: |
507 | * (1) logic cpu number which is > 0. |
508 | * (2) -ENODEV when the device tree(DT) node is valid and found in the DT but |
509 | * there is no possible logical CPU in the kernel to match. This happens |
510 | * when CONFIG_NR_CPUS is configure to be smaller than the number of |
511 | * CPU nodes in DT. We need to just ignore this case. |
512 | * (3) -1 if the node does not exist in the device tree |
513 | */ |
514 | static int __init get_cpu_for_node(struct device_node *node) |
515 | { |
516 | struct device_node *cpu_node; |
517 | int cpu; |
518 | |
519 | cpu_node = of_parse_phandle(node, "cpu" , 0); |
520 | if (!cpu_node) |
521 | return -1; |
522 | |
523 | cpu = of_cpu_node_to_id(cpu_node); |
524 | if (cpu >= 0) |
525 | topology_parse_cpu_capacity(cpu_node, cpu); |
526 | else |
527 | pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n" , |
528 | cpu_node, cpumask_pr_args(cpu_possible_mask)); |
529 | |
530 | of_node_put(cpu_node); |
531 | return cpu; |
532 | } |
533 | |
534 | static int __init parse_core(struct device_node *core, int package_id, |
535 | int cluster_id, int core_id) |
536 | { |
537 | char name[20]; |
538 | bool leaf = true; |
539 | int i = 0; |
540 | int cpu; |
541 | struct device_node *t; |
542 | |
543 | do { |
544 | snprintf(name, sizeof(name), "thread%d" , i); |
545 | t = of_get_child_by_name(core, name); |
546 | if (t) { |
547 | leaf = false; |
548 | cpu = get_cpu_for_node(t); |
549 | if (cpu >= 0) { |
550 | cpu_topology[cpu].package_id = package_id; |
551 | cpu_topology[cpu].cluster_id = cluster_id; |
552 | cpu_topology[cpu].core_id = core_id; |
553 | cpu_topology[cpu].thread_id = i; |
554 | } else if (cpu != -ENODEV) { |
555 | pr_err("%pOF: Can't get CPU for thread\n" , t); |
556 | of_node_put(t); |
557 | return -EINVAL; |
558 | } |
559 | of_node_put(t); |
560 | } |
561 | i++; |
562 | } while (t); |
563 | |
564 | cpu = get_cpu_for_node(core); |
565 | if (cpu >= 0) { |
566 | if (!leaf) { |
567 | pr_err("%pOF: Core has both threads and CPU\n" , |
568 | core); |
569 | return -EINVAL; |
570 | } |
571 | |
572 | cpu_topology[cpu].package_id = package_id; |
573 | cpu_topology[cpu].cluster_id = cluster_id; |
574 | cpu_topology[cpu].core_id = core_id; |
575 | } else if (leaf && cpu != -ENODEV) { |
576 | pr_err("%pOF: Can't get CPU for leaf core\n" , core); |
577 | return -EINVAL; |
578 | } |
579 | |
580 | return 0; |
581 | } |
582 | |
583 | static int __init parse_cluster(struct device_node *cluster, int package_id, |
584 | int cluster_id, int depth) |
585 | { |
586 | char name[20]; |
587 | bool leaf = true; |
588 | bool has_cores = false; |
589 | struct device_node *c; |
590 | int core_id = 0; |
591 | int i, ret; |
592 | |
593 | /* |
594 | * First check for child clusters; we currently ignore any |
595 | * information about the nesting of clusters and present the |
596 | * scheduler with a flat list of them. |
597 | */ |
598 | i = 0; |
599 | do { |
600 | snprintf(name, sizeof(name), "cluster%d" , i); |
601 | c = of_get_child_by_name(cluster, name); |
602 | if (c) { |
603 | leaf = false; |
604 | ret = parse_cluster(c, package_id, i, depth + 1); |
605 | if (depth > 0) |
606 | pr_warn("Topology for clusters of clusters not yet supported\n" ); |
607 | of_node_put(c); |
608 | if (ret != 0) |
609 | return ret; |
610 | } |
611 | i++; |
612 | } while (c); |
613 | |
614 | /* Now check for cores */ |
615 | i = 0; |
616 | do { |
617 | snprintf(name, sizeof(name), "core%d" , i); |
618 | c = of_get_child_by_name(cluster, name); |
619 | if (c) { |
620 | has_cores = true; |
621 | |
622 | if (depth == 0) { |
623 | pr_err("%pOF: cpu-map children should be clusters\n" , |
624 | c); |
625 | of_node_put(c); |
626 | return -EINVAL; |
627 | } |
628 | |
629 | if (leaf) { |
630 | ret = parse_core(c, package_id, cluster_id, |
631 | core_id++); |
632 | } else { |
633 | pr_err("%pOF: Non-leaf cluster with core %s\n" , |
634 | cluster, name); |
635 | ret = -EINVAL; |
636 | } |
637 | |
638 | of_node_put(c); |
639 | if (ret != 0) |
640 | return ret; |
641 | } |
642 | i++; |
643 | } while (c); |
644 | |
645 | if (leaf && !has_cores) |
646 | pr_warn("%pOF: empty cluster\n" , cluster); |
647 | |
648 | return 0; |
649 | } |
650 | |
651 | static int __init parse_socket(struct device_node *socket) |
652 | { |
653 | char name[20]; |
654 | struct device_node *c; |
655 | bool has_socket = false; |
656 | int package_id = 0, ret; |
657 | |
658 | do { |
659 | snprintf(name, sizeof(name), "socket%d" , package_id); |
660 | c = of_get_child_by_name(socket, name); |
661 | if (c) { |
662 | has_socket = true; |
663 | ret = parse_cluster(c, package_id, -1, 0); |
664 | of_node_put(c); |
665 | if (ret != 0) |
666 | return ret; |
667 | } |
668 | package_id++; |
669 | } while (c); |
670 | |
671 | if (!has_socket) |
672 | ret = parse_cluster(socket, 0, -1, 0); |
673 | |
674 | return ret; |
675 | } |
676 | |
677 | static int __init parse_dt_topology(void) |
678 | { |
679 | struct device_node *cn, *map; |
680 | int ret = 0; |
681 | int cpu; |
682 | |
683 | cn = of_find_node_by_path("/cpus" ); |
684 | if (!cn) { |
685 | pr_err("No CPU information found in DT\n" ); |
686 | return 0; |
687 | } |
688 | |
689 | /* |
690 | * When topology is provided cpu-map is essentially a root |
691 | * cluster with restricted subnodes. |
692 | */ |
693 | map = of_get_child_by_name(cn, "cpu-map" ); |
694 | if (!map) |
695 | goto out; |
696 | |
697 | ret = parse_socket(map); |
698 | if (ret != 0) |
699 | goto out_map; |
700 | |
701 | topology_normalize_cpu_scale(); |
702 | |
703 | /* |
704 | * Check that all cores are in the topology; the SMP code will |
705 | * only mark cores described in the DT as possible. |
706 | */ |
707 | for_each_possible_cpu(cpu) |
708 | if (cpu_topology[cpu].package_id < 0) { |
709 | ret = -EINVAL; |
710 | break; |
711 | } |
712 | |
713 | out_map: |
714 | of_node_put(map); |
715 | out: |
716 | of_node_put(cn); |
717 | return ret; |
718 | } |
719 | #endif |
720 | |
721 | /* |
722 | * cpu topology table |
723 | */ |
724 | struct cpu_topology cpu_topology[NR_CPUS]; |
725 | EXPORT_SYMBOL_GPL(cpu_topology); |
726 | |
727 | const struct cpumask *cpu_coregroup_mask(int cpu) |
728 | { |
729 | const cpumask_t *core_mask = cpumask_of_node(cpu_to_node(cpu)); |
730 | |
731 | /* Find the smaller of NUMA, core or LLC siblings */ |
732 | if (cpumask_subset(src1p: &cpu_topology[cpu].core_sibling, src2p: 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(src1p: &cpu_topology[cpu].llc_sibling, src2p: 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(src1p: core_mask, src2p: &cpu_topology[cpu].cluster_sibling)) |
749 | core_mask = &cpu_topology[cpu].cluster_sibling; |
750 | |
751 | return core_mask; |
752 | } |
753 | |
754 | const struct cpumask *cpu_clustergroup_mask(int cpu) |
755 | { |
756 | /* |
757 | * Forbid cpu_clustergroup_mask() to span more or the same CPUs as |
758 | * cpu_coregroup_mask(). |
759 | */ |
760 | if (cpumask_subset(src1p: cpu_coregroup_mask(cpu), |
761 | src2p: &cpu_topology[cpu].cluster_sibling)) |
762 | return topology_sibling_cpumask(cpu); |
763 | |
764 | return &cpu_topology[cpu].cluster_sibling; |
765 | } |
766 | |
767 | void update_siblings_masks(unsigned int cpuid) |
768 | { |
769 | struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid]; |
770 | int cpu, ret; |
771 | |
772 | ret = detect_cache_attributes(cpu: 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_x: cpu, cpu_y: cpuid)) { |
781 | cpumask_set_cpu(cpu, dstp: &cpuid_topo->llc_sibling); |
782 | cpumask_set_cpu(cpu: cpuid, dstp: &cpu_topo->llc_sibling); |
783 | } |
784 | |
785 | if (cpuid_topo->package_id != cpu_topo->package_id) |
786 | continue; |
787 | |
788 | cpumask_set_cpu(cpu: cpuid, dstp: &cpu_topo->core_sibling); |
789 | cpumask_set_cpu(cpu, dstp: &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, dstp: &cpuid_topo->cluster_sibling); |
796 | cpumask_set_cpu(cpu: cpuid, dstp: &cpu_topo->cluster_sibling); |
797 | } |
798 | |
799 | if (cpuid_topo->core_id != cpu_topo->core_id) |
800 | continue; |
801 | |
802 | cpumask_set_cpu(cpu: cpuid, dstp: &cpu_topo->thread_sibling); |
803 | cpumask_set_cpu(cpu, dstp: &cpuid_topo->thread_sibling); |
804 | } |
805 | } |
806 | |
807 | static void clear_cpu_topology(int cpu) |
808 | { |
809 | struct cpu_topology *cpu_topo = &cpu_topology[cpu]; |
810 | |
811 | cpumask_clear(dstp: &cpu_topo->llc_sibling); |
812 | cpumask_set_cpu(cpu, dstp: &cpu_topo->llc_sibling); |
813 | |
814 | cpumask_clear(dstp: &cpu_topo->cluster_sibling); |
815 | cpumask_set_cpu(cpu, dstp: &cpu_topo->cluster_sibling); |
816 | |
817 | cpumask_clear(dstp: &cpu_topo->core_sibling); |
818 | cpumask_set_cpu(cpu, dstp: &cpu_topo->core_sibling); |
819 | cpumask_clear(dstp: &cpu_topo->thread_sibling); |
820 | cpumask_set_cpu(cpu, dstp: &cpu_topo->thread_sibling); |
821 | } |
822 | |
823 | void __init reset_cpu_topology(void) |
824 | { |
825 | unsigned int cpu; |
826 | |
827 | for_each_possible_cpu(cpu) { |
828 | struct cpu_topology *cpu_topo = &cpu_topology[cpu]; |
829 | |
830 | cpu_topo->thread_id = -1; |
831 | cpu_topo->core_id = -1; |
832 | cpu_topo->cluster_id = -1; |
833 | cpu_topo->package_id = -1; |
834 | |
835 | clear_cpu_topology(cpu); |
836 | } |
837 | } |
838 | |
839 | void remove_cpu_topology(unsigned int cpu) |
840 | { |
841 | int sibling; |
842 | |
843 | for_each_cpu(sibling, topology_core_cpumask(cpu)) |
844 | cpumask_clear_cpu(cpu, topology_core_cpumask(sibling)); |
845 | for_each_cpu(sibling, topology_sibling_cpumask(cpu)) |
846 | cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling)); |
847 | for_each_cpu(sibling, topology_cluster_cpumask(cpu)) |
848 | cpumask_clear_cpu(cpu, topology_cluster_cpumask(sibling)); |
849 | for_each_cpu(sibling, topology_llc_cpumask(cpu)) |
850 | cpumask_clear_cpu(cpu, dstp: topology_llc_cpumask(sibling)); |
851 | |
852 | clear_cpu_topology(cpu); |
853 | } |
854 | |
855 | __weak int __init parse_acpi_topology(void) |
856 | { |
857 | return 0; |
858 | } |
859 | |
860 | #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV) |
861 | void __init init_cpu_topology(void) |
862 | { |
863 | int cpu, ret; |
864 | |
865 | reset_cpu_topology(); |
866 | ret = parse_acpi_topology(); |
867 | if (!ret) |
868 | ret = of_have_populated_dt() && parse_dt_topology(); |
869 | |
870 | if (ret) { |
871 | /* |
872 | * Discard anything that was parsed if we hit an error so we |
873 | * don't use partial information. But do not return yet to give |
874 | * arch-specific early cache level detection a chance to run. |
875 | */ |
876 | reset_cpu_topology(); |
877 | } |
878 | |
879 | for_each_possible_cpu(cpu) { |
880 | ret = fetch_cache_info(cpu); |
881 | if (!ret) |
882 | continue; |
883 | else if (ret != -ENOENT) |
884 | pr_err("Early cacheinfo failed, ret = %d\n" , ret); |
885 | return; |
886 | } |
887 | } |
888 | |
889 | void store_cpu_topology(unsigned int cpuid) |
890 | { |
891 | struct cpu_topology *cpuid_topo = &cpu_topology[cpuid]; |
892 | |
893 | if (cpuid_topo->package_id != -1) |
894 | goto topology_populated; |
895 | |
896 | cpuid_topo->thread_id = -1; |
897 | cpuid_topo->core_id = cpuid; |
898 | cpuid_topo->package_id = cpu_to_node(cpuid); |
899 | |
900 | pr_debug("CPU%u: package %d core %d thread %d\n" , |
901 | cpuid, cpuid_topo->package_id, cpuid_topo->core_id, |
902 | cpuid_topo->thread_id); |
903 | |
904 | topology_populated: |
905 | update_siblings_masks(cpuid); |
906 | } |
907 | #endif |
908 | |