Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * cacheinfo support - processor cache information via sysfs
4 : *
5 : * Based on arch/x86/kernel/cpu/intel_cacheinfo.c
6 : * Author: Sudeep Holla <sudeep.holla@arm.com>
7 : */
8 : #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 :
10 : #include <linux/acpi.h>
11 : #include <linux/bitops.h>
12 : #include <linux/cacheinfo.h>
13 : #include <linux/compiler.h>
14 : #include <linux/cpu.h>
15 : #include <linux/device.h>
16 : #include <linux/init.h>
17 : #include <linux/of.h>
18 : #include <linux/sched.h>
19 : #include <linux/slab.h>
20 : #include <linux/smp.h>
21 : #include <linux/sysfs.h>
22 :
23 : /* pointer to per cpu cacheinfo */
24 : static DEFINE_PER_CPU(struct cpu_cacheinfo, ci_cpu_cacheinfo);
25 : #define ci_cacheinfo(cpu) (&per_cpu(ci_cpu_cacheinfo, cpu))
26 : #define cache_leaves(cpu) (ci_cacheinfo(cpu)->num_leaves)
27 : #define per_cpu_cacheinfo(cpu) (ci_cacheinfo(cpu)->info_list)
28 :
29 0 : struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu)
30 : {
31 0 : return ci_cacheinfo(cpu);
32 : }
33 :
34 : #ifdef CONFIG_OF
35 : static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
36 : struct cacheinfo *sib_leaf)
37 : {
38 : return sib_leaf->fw_token == this_leaf->fw_token;
39 : }
40 :
41 : /* OF properties to query for a given cache type */
42 : struct cache_type_info {
43 : const char *size_prop;
44 : const char *line_size_props[2];
45 : const char *nr_sets_prop;
46 : };
47 :
48 : static const struct cache_type_info cache_type_info[] = {
49 : {
50 : .size_prop = "cache-size",
51 : .line_size_props = { "cache-line-size",
52 : "cache-block-size", },
53 : .nr_sets_prop = "cache-sets",
54 : }, {
55 : .size_prop = "i-cache-size",
56 : .line_size_props = { "i-cache-line-size",
57 : "i-cache-block-size", },
58 : .nr_sets_prop = "i-cache-sets",
59 : }, {
60 : .size_prop = "d-cache-size",
61 : .line_size_props = { "d-cache-line-size",
62 : "d-cache-block-size", },
63 : .nr_sets_prop = "d-cache-sets",
64 : },
65 : };
66 :
67 : static inline int get_cacheinfo_idx(enum cache_type type)
68 : {
69 : if (type == CACHE_TYPE_UNIFIED)
70 : return 0;
71 : return type;
72 : }
73 :
74 : static void cache_size(struct cacheinfo *this_leaf, struct device_node *np)
75 : {
76 : const char *propname;
77 : int ct_idx;
78 :
79 : ct_idx = get_cacheinfo_idx(this_leaf->type);
80 : propname = cache_type_info[ct_idx].size_prop;
81 :
82 : of_property_read_u32(np, propname, &this_leaf->size);
83 : }
84 :
85 : /* not cache_line_size() because that's a macro in include/linux/cache.h */
86 : static void cache_get_line_size(struct cacheinfo *this_leaf,
87 : struct device_node *np)
88 : {
89 : int i, lim, ct_idx;
90 :
91 : ct_idx = get_cacheinfo_idx(this_leaf->type);
92 : lim = ARRAY_SIZE(cache_type_info[ct_idx].line_size_props);
93 :
94 : for (i = 0; i < lim; i++) {
95 : int ret;
96 : u32 line_size;
97 : const char *propname;
98 :
99 : propname = cache_type_info[ct_idx].line_size_props[i];
100 : ret = of_property_read_u32(np, propname, &line_size);
101 : if (!ret) {
102 : this_leaf->coherency_line_size = line_size;
103 : break;
104 : }
105 : }
106 : }
107 :
108 : static void cache_nr_sets(struct cacheinfo *this_leaf, struct device_node *np)
109 : {
110 : const char *propname;
111 : int ct_idx;
112 :
113 : ct_idx = get_cacheinfo_idx(this_leaf->type);
114 : propname = cache_type_info[ct_idx].nr_sets_prop;
115 :
116 : of_property_read_u32(np, propname, &this_leaf->number_of_sets);
117 : }
118 :
119 : static void cache_associativity(struct cacheinfo *this_leaf)
120 : {
121 : unsigned int line_size = this_leaf->coherency_line_size;
122 : unsigned int nr_sets = this_leaf->number_of_sets;
123 : unsigned int size = this_leaf->size;
124 :
125 : /*
126 : * If the cache is fully associative, there is no need to
127 : * check the other properties.
128 : */
129 : if (!(nr_sets == 1) && (nr_sets > 0 && size > 0 && line_size > 0))
130 : this_leaf->ways_of_associativity = (size / nr_sets) / line_size;
131 : }
132 :
133 : static bool cache_node_is_unified(struct cacheinfo *this_leaf,
134 : struct device_node *np)
135 : {
136 : return of_property_read_bool(np, "cache-unified");
137 : }
138 :
139 : static void cache_of_set_props(struct cacheinfo *this_leaf,
140 : struct device_node *np)
141 : {
142 : /*
143 : * init_cache_level must setup the cache level correctly
144 : * overriding the architecturally specified levels, so
145 : * if type is NONE at this stage, it should be unified
146 : */
147 : if (this_leaf->type == CACHE_TYPE_NOCACHE &&
148 : cache_node_is_unified(this_leaf, np))
149 : this_leaf->type = CACHE_TYPE_UNIFIED;
150 : cache_size(this_leaf, np);
151 : cache_get_line_size(this_leaf, np);
152 : cache_nr_sets(this_leaf, np);
153 : cache_associativity(this_leaf);
154 : }
155 :
156 : static int cache_setup_of_node(unsigned int cpu)
157 : {
158 : struct device_node *np;
159 : struct cacheinfo *this_leaf;
160 : struct device *cpu_dev = get_cpu_device(cpu);
161 : struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
162 : unsigned int index = 0;
163 :
164 : /* skip if fw_token is already populated */
165 : if (this_cpu_ci->info_list->fw_token) {
166 : return 0;
167 : }
168 :
169 : if (!cpu_dev) {
170 : pr_err("No cpu device for CPU %d\n", cpu);
171 : return -ENODEV;
172 : }
173 : np = cpu_dev->of_node;
174 : if (!np) {
175 : pr_err("Failed to find cpu%d device node\n", cpu);
176 : return -ENOENT;
177 : }
178 :
179 : while (index < cache_leaves(cpu)) {
180 : this_leaf = this_cpu_ci->info_list + index;
181 : if (this_leaf->level != 1)
182 : np = of_find_next_cache_node(np);
183 : else
184 : np = of_node_get(np);/* cpu node itself */
185 : if (!np)
186 : break;
187 : cache_of_set_props(this_leaf, np);
188 : this_leaf->fw_token = np;
189 : index++;
190 : }
191 :
192 : if (index != cache_leaves(cpu)) /* not all OF nodes populated */
193 : return -ENOENT;
194 :
195 : return 0;
196 : }
197 : #else
198 : static inline int cache_setup_of_node(unsigned int cpu) { return 0; }
199 : static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
200 : struct cacheinfo *sib_leaf)
201 : {
202 : /*
203 : * For non-DT/ACPI systems, assume unique level 1 caches, system-wide
204 : * shared caches for all other levels. This will be used only if
205 : * arch specific code has not populated shared_cpu_map
206 : */
207 : return !(this_leaf->level == 1);
208 : }
209 : #endif
210 :
211 0 : int __weak cache_setup_acpi(unsigned int cpu)
212 : {
213 0 : return -ENOTSUPP;
214 : }
215 :
216 : unsigned int coherency_max_size;
217 :
218 0 : static int cache_shared_cpu_map_setup(unsigned int cpu)
219 : {
220 0 : struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
221 : struct cacheinfo *this_leaf, *sib_leaf;
222 : unsigned int index;
223 0 : int ret = 0;
224 :
225 0 : if (this_cpu_ci->cpu_map_populated)
226 : return 0;
227 :
228 : if (of_have_populated_dt())
229 : ret = cache_setup_of_node(cpu);
230 : else if (!acpi_disabled)
231 : ret = cache_setup_acpi(cpu);
232 :
233 : if (ret)
234 : return ret;
235 :
236 0 : for (index = 0; index < cache_leaves(cpu); index++) {
237 : unsigned int i;
238 :
239 0 : this_leaf = this_cpu_ci->info_list + index;
240 : /* skip if shared_cpu_map is already populated */
241 0 : if (!cpumask_empty(&this_leaf->shared_cpu_map))
242 0 : continue;
243 :
244 0 : cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
245 0 : for_each_online_cpu(i) {
246 0 : struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
247 :
248 0 : if (i == cpu || !sib_cpu_ci->info_list)
249 0 : continue;/* skip if itself or no cacheinfo */
250 0 : sib_leaf = sib_cpu_ci->info_list + index;
251 0 : if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
252 0 : cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);
253 0 : cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
254 : }
255 : }
256 : /* record the maximum cache line size */
257 0 : if (this_leaf->coherency_line_size > coherency_max_size)
258 0 : coherency_max_size = this_leaf->coherency_line_size;
259 : }
260 :
261 : return 0;
262 : }
263 :
264 0 : static void cache_shared_cpu_map_remove(unsigned int cpu)
265 : {
266 0 : struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
267 : struct cacheinfo *this_leaf, *sib_leaf;
268 : unsigned int sibling, index;
269 :
270 0 : for (index = 0; index < cache_leaves(cpu); index++) {
271 0 : this_leaf = this_cpu_ci->info_list + index;
272 0 : for_each_cpu(sibling, &this_leaf->shared_cpu_map) {
273 : struct cpu_cacheinfo *sib_cpu_ci;
274 :
275 0 : if (sibling == cpu) /* skip itself */
276 0 : continue;
277 :
278 0 : sib_cpu_ci = get_cpu_cacheinfo(sibling);
279 0 : if (!sib_cpu_ci->info_list)
280 0 : continue;
281 :
282 0 : sib_leaf = sib_cpu_ci->info_list + index;
283 0 : cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
284 0 : cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
285 : }
286 : if (of_have_populated_dt())
287 : of_node_put(this_leaf->fw_token);
288 : }
289 0 : }
290 :
291 0 : static void free_cache_attributes(unsigned int cpu)
292 : {
293 0 : if (!per_cpu_cacheinfo(cpu))
294 : return;
295 :
296 0 : cache_shared_cpu_map_remove(cpu);
297 :
298 0 : kfree(per_cpu_cacheinfo(cpu));
299 0 : per_cpu_cacheinfo(cpu) = NULL;
300 0 : cache_leaves(cpu) = 0;
301 : }
302 :
303 1 : int __weak init_cache_level(unsigned int cpu)
304 : {
305 1 : return -ENOENT;
306 : }
307 :
308 0 : int __weak populate_cache_leaves(unsigned int cpu)
309 : {
310 0 : return -ENOENT;
311 : }
312 :
313 1 : static int detect_cache_attributes(unsigned int cpu)
314 : {
315 : int ret;
316 :
317 1 : if (init_cache_level(cpu) || !cache_leaves(cpu))
318 : return -ENOENT;
319 :
320 0 : per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu),
321 : sizeof(struct cacheinfo), GFP_KERNEL);
322 0 : if (per_cpu_cacheinfo(cpu) == NULL)
323 : return -ENOMEM;
324 :
325 : /*
326 : * populate_cache_leaves() may completely setup the cache leaves and
327 : * shared_cpu_map or it may leave it partially setup.
328 : */
329 0 : ret = populate_cache_leaves(cpu);
330 0 : if (ret)
331 : goto free_ci;
332 : /*
333 : * For systems using DT for cache hierarchy, fw_token
334 : * and shared_cpu_map will be set up here only if they are
335 : * not populated already
336 : */
337 0 : ret = cache_shared_cpu_map_setup(cpu);
338 0 : if (ret) {
339 0 : pr_warn("Unable to detect cache hierarchy for CPU %d\n", cpu);
340 0 : goto free_ci;
341 : }
342 :
343 : return 0;
344 :
345 : free_ci:
346 0 : free_cache_attributes(cpu);
347 0 : return ret;
348 : }
349 :
350 : /* pointer to cpuX/cache device */
351 : static DEFINE_PER_CPU(struct device *, ci_cache_dev);
352 : #define per_cpu_cache_dev(cpu) (per_cpu(ci_cache_dev, cpu))
353 :
354 : static cpumask_t cache_dev_map;
355 :
356 : /* pointer to array of devices for cpuX/cache/indexY */
357 : static DEFINE_PER_CPU(struct device **, ci_index_dev);
358 : #define per_cpu_index_dev(cpu) (per_cpu(ci_index_dev, cpu))
359 : #define per_cache_index_dev(cpu, idx) ((per_cpu_index_dev(cpu))[idx])
360 :
361 : #define show_one(file_name, object) \
362 : static ssize_t file_name##_show(struct device *dev, \
363 : struct device_attribute *attr, char *buf) \
364 : { \
365 : struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
366 : return sysfs_emit(buf, "%u\n", this_leaf->object); \
367 : }
368 :
369 0 : show_one(id, id);
370 0 : show_one(level, level);
371 0 : show_one(coherency_line_size, coherency_line_size);
372 0 : show_one(number_of_sets, number_of_sets);
373 0 : show_one(physical_line_partition, physical_line_partition);
374 0 : show_one(ways_of_associativity, ways_of_associativity);
375 :
376 0 : static ssize_t size_show(struct device *dev,
377 : struct device_attribute *attr, char *buf)
378 : {
379 0 : struct cacheinfo *this_leaf = dev_get_drvdata(dev);
380 :
381 0 : return sysfs_emit(buf, "%uK\n", this_leaf->size >> 10);
382 : }
383 :
384 0 : static ssize_t shared_cpu_map_show(struct device *dev,
385 : struct device_attribute *attr, char *buf)
386 : {
387 0 : struct cacheinfo *this_leaf = dev_get_drvdata(dev);
388 0 : const struct cpumask *mask = &this_leaf->shared_cpu_map;
389 :
390 0 : return sysfs_emit(buf, "%*pb\n", nr_cpu_ids, mask);
391 : }
392 :
393 0 : static ssize_t shared_cpu_list_show(struct device *dev,
394 : struct device_attribute *attr, char *buf)
395 : {
396 0 : struct cacheinfo *this_leaf = dev_get_drvdata(dev);
397 0 : const struct cpumask *mask = &this_leaf->shared_cpu_map;
398 :
399 0 : return sysfs_emit(buf, "%*pbl\n", nr_cpu_ids, mask);
400 : }
401 :
402 0 : static ssize_t type_show(struct device *dev,
403 : struct device_attribute *attr, char *buf)
404 : {
405 0 : struct cacheinfo *this_leaf = dev_get_drvdata(dev);
406 : const char *output;
407 :
408 0 : switch (this_leaf->type) {
409 : case CACHE_TYPE_DATA:
410 : output = "Data";
411 : break;
412 : case CACHE_TYPE_INST:
413 0 : output = "Instruction";
414 0 : break;
415 : case CACHE_TYPE_UNIFIED:
416 0 : output = "Unified";
417 0 : break;
418 : default:
419 : return -EINVAL;
420 : }
421 :
422 0 : return sysfs_emit(buf, "%s\n", output);
423 : }
424 :
425 0 : static ssize_t allocation_policy_show(struct device *dev,
426 : struct device_attribute *attr, char *buf)
427 : {
428 0 : struct cacheinfo *this_leaf = dev_get_drvdata(dev);
429 0 : unsigned int ci_attr = this_leaf->attributes;
430 : const char *output;
431 :
432 0 : if ((ci_attr & CACHE_READ_ALLOCATE) && (ci_attr & CACHE_WRITE_ALLOCATE))
433 : output = "ReadWriteAllocate";
434 0 : else if (ci_attr & CACHE_READ_ALLOCATE)
435 : output = "ReadAllocate";
436 0 : else if (ci_attr & CACHE_WRITE_ALLOCATE)
437 : output = "WriteAllocate";
438 : else
439 : return 0;
440 :
441 0 : return sysfs_emit(buf, "%s\n", output);
442 : }
443 :
444 0 : static ssize_t write_policy_show(struct device *dev,
445 : struct device_attribute *attr, char *buf)
446 : {
447 0 : struct cacheinfo *this_leaf = dev_get_drvdata(dev);
448 0 : unsigned int ci_attr = this_leaf->attributes;
449 0 : int n = 0;
450 :
451 0 : if (ci_attr & CACHE_WRITE_THROUGH)
452 0 : n = sysfs_emit(buf, "WriteThrough\n");
453 0 : else if (ci_attr & CACHE_WRITE_BACK)
454 0 : n = sysfs_emit(buf, "WriteBack\n");
455 0 : return n;
456 : }
457 :
458 : static DEVICE_ATTR_RO(id);
459 : static DEVICE_ATTR_RO(level);
460 : static DEVICE_ATTR_RO(type);
461 : static DEVICE_ATTR_RO(coherency_line_size);
462 : static DEVICE_ATTR_RO(ways_of_associativity);
463 : static DEVICE_ATTR_RO(number_of_sets);
464 : static DEVICE_ATTR_RO(size);
465 : static DEVICE_ATTR_RO(allocation_policy);
466 : static DEVICE_ATTR_RO(write_policy);
467 : static DEVICE_ATTR_RO(shared_cpu_map);
468 : static DEVICE_ATTR_RO(shared_cpu_list);
469 : static DEVICE_ATTR_RO(physical_line_partition);
470 :
471 : static struct attribute *cache_default_attrs[] = {
472 : &dev_attr_id.attr,
473 : &dev_attr_type.attr,
474 : &dev_attr_level.attr,
475 : &dev_attr_shared_cpu_map.attr,
476 : &dev_attr_shared_cpu_list.attr,
477 : &dev_attr_coherency_line_size.attr,
478 : &dev_attr_ways_of_associativity.attr,
479 : &dev_attr_number_of_sets.attr,
480 : &dev_attr_size.attr,
481 : &dev_attr_allocation_policy.attr,
482 : &dev_attr_write_policy.attr,
483 : &dev_attr_physical_line_partition.attr,
484 : NULL
485 : };
486 :
487 : static umode_t
488 0 : cache_default_attrs_is_visible(struct kobject *kobj,
489 : struct attribute *attr, int unused)
490 : {
491 0 : struct device *dev = kobj_to_dev(kobj);
492 0 : struct cacheinfo *this_leaf = dev_get_drvdata(dev);
493 0 : const struct cpumask *mask = &this_leaf->shared_cpu_map;
494 0 : umode_t mode = attr->mode;
495 :
496 0 : if ((attr == &dev_attr_id.attr) && (this_leaf->attributes & CACHE_ID))
497 : return mode;
498 0 : if ((attr == &dev_attr_type.attr) && this_leaf->type)
499 : return mode;
500 0 : if ((attr == &dev_attr_level.attr) && this_leaf->level)
501 : return mode;
502 0 : if ((attr == &dev_attr_shared_cpu_map.attr) && !cpumask_empty(mask))
503 : return mode;
504 0 : if ((attr == &dev_attr_shared_cpu_list.attr) && !cpumask_empty(mask))
505 : return mode;
506 0 : if ((attr == &dev_attr_coherency_line_size.attr) &&
507 0 : this_leaf->coherency_line_size)
508 : return mode;
509 0 : if ((attr == &dev_attr_ways_of_associativity.attr) &&
510 0 : this_leaf->size) /* allow 0 = full associativity */
511 : return mode;
512 0 : if ((attr == &dev_attr_number_of_sets.attr) &&
513 0 : this_leaf->number_of_sets)
514 : return mode;
515 0 : if ((attr == &dev_attr_size.attr) && this_leaf->size)
516 : return mode;
517 0 : if ((attr == &dev_attr_write_policy.attr) &&
518 0 : (this_leaf->attributes & CACHE_WRITE_POLICY_MASK))
519 : return mode;
520 0 : if ((attr == &dev_attr_allocation_policy.attr) &&
521 0 : (this_leaf->attributes & CACHE_ALLOCATE_POLICY_MASK))
522 : return mode;
523 0 : if ((attr == &dev_attr_physical_line_partition.attr) &&
524 0 : this_leaf->physical_line_partition)
525 : return mode;
526 :
527 0 : return 0;
528 : }
529 :
530 : static const struct attribute_group cache_default_group = {
531 : .attrs = cache_default_attrs,
532 : .is_visible = cache_default_attrs_is_visible,
533 : };
534 :
535 : static const struct attribute_group *cache_default_groups[] = {
536 : &cache_default_group,
537 : NULL,
538 : };
539 :
540 : static const struct attribute_group *cache_private_groups[] = {
541 : &cache_default_group,
542 : NULL, /* Place holder for private group */
543 : NULL,
544 : };
545 :
546 : const struct attribute_group *
547 0 : __weak cache_get_priv_group(struct cacheinfo *this_leaf)
548 : {
549 0 : return NULL;
550 : }
551 :
552 : static const struct attribute_group **
553 : cache_get_attribute_groups(struct cacheinfo *this_leaf)
554 : {
555 0 : const struct attribute_group *priv_group =
556 : cache_get_priv_group(this_leaf);
557 :
558 0 : if (!priv_group)
559 : return cache_default_groups;
560 :
561 0 : if (!cache_private_groups[1])
562 0 : cache_private_groups[1] = priv_group;
563 :
564 : return cache_private_groups;
565 : }
566 :
567 : /* Add/Remove cache interface for CPU device */
568 0 : static void cpu_cache_sysfs_exit(unsigned int cpu)
569 : {
570 : int i;
571 : struct device *ci_dev;
572 :
573 0 : if (per_cpu_index_dev(cpu)) {
574 0 : for (i = 0; i < cache_leaves(cpu); i++) {
575 0 : ci_dev = per_cache_index_dev(cpu, i);
576 0 : if (!ci_dev)
577 0 : continue;
578 0 : device_unregister(ci_dev);
579 : }
580 0 : kfree(per_cpu_index_dev(cpu));
581 0 : per_cpu_index_dev(cpu) = NULL;
582 : }
583 0 : device_unregister(per_cpu_cache_dev(cpu));
584 0 : per_cpu_cache_dev(cpu) = NULL;
585 0 : }
586 :
587 0 : static int cpu_cache_sysfs_init(unsigned int cpu)
588 : {
589 0 : struct device *dev = get_cpu_device(cpu);
590 :
591 0 : if (per_cpu_cacheinfo(cpu) == NULL)
592 : return -ENOENT;
593 :
594 0 : per_cpu_cache_dev(cpu) = cpu_device_create(dev, NULL, NULL, "cache");
595 0 : if (IS_ERR(per_cpu_cache_dev(cpu)))
596 0 : return PTR_ERR(per_cpu_cache_dev(cpu));
597 :
598 : /* Allocate all required memory */
599 0 : per_cpu_index_dev(cpu) = kcalloc(cache_leaves(cpu),
600 : sizeof(struct device *), GFP_KERNEL);
601 0 : if (unlikely(per_cpu_index_dev(cpu) == NULL))
602 : goto err_out;
603 :
604 : return 0;
605 :
606 : err_out:
607 0 : cpu_cache_sysfs_exit(cpu);
608 0 : return -ENOMEM;
609 : }
610 :
611 0 : static int cache_add_dev(unsigned int cpu)
612 : {
613 : unsigned int i;
614 : int rc;
615 : struct device *ci_dev, *parent;
616 : struct cacheinfo *this_leaf;
617 0 : struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
618 : const struct attribute_group **cache_groups;
619 :
620 0 : rc = cpu_cache_sysfs_init(cpu);
621 0 : if (unlikely(rc < 0))
622 : return rc;
623 :
624 0 : parent = per_cpu_cache_dev(cpu);
625 0 : for (i = 0; i < cache_leaves(cpu); i++) {
626 0 : this_leaf = this_cpu_ci->info_list + i;
627 0 : if (this_leaf->disable_sysfs)
628 0 : continue;
629 0 : if (this_leaf->type == CACHE_TYPE_NOCACHE)
630 : break;
631 0 : cache_groups = cache_get_attribute_groups(this_leaf);
632 0 : ci_dev = cpu_device_create(parent, this_leaf, cache_groups,
633 : "index%1u", i);
634 0 : if (IS_ERR(ci_dev)) {
635 0 : rc = PTR_ERR(ci_dev);
636 : goto err;
637 : }
638 0 : per_cache_index_dev(cpu, i) = ci_dev;
639 : }
640 : cpumask_set_cpu(cpu, &cache_dev_map);
641 :
642 : return 0;
643 : err:
644 0 : cpu_cache_sysfs_exit(cpu);
645 0 : return rc;
646 : }
647 :
648 1 : static int cacheinfo_cpu_online(unsigned int cpu)
649 : {
650 1 : int rc = detect_cache_attributes(cpu);
651 :
652 1 : if (rc)
653 : return rc;
654 0 : rc = cache_add_dev(cpu);
655 0 : if (rc)
656 0 : free_cache_attributes(cpu);
657 : return rc;
658 : }
659 :
660 0 : static int cacheinfo_cpu_pre_down(unsigned int cpu)
661 : {
662 0 : if (cpumask_test_and_clear_cpu(cpu, &cache_dev_map))
663 0 : cpu_cache_sysfs_exit(cpu);
664 :
665 0 : free_cache_attributes(cpu);
666 0 : return 0;
667 : }
668 :
669 1 : static int __init cacheinfo_sysfs_init(void)
670 : {
671 1 : return cpuhp_setup_state(CPUHP_AP_BASE_CACHEINFO_ONLINE,
672 : "base/cacheinfo:online",
673 : cacheinfo_cpu_online, cacheinfo_cpu_pre_down);
674 : }
675 : device_initcall(cacheinfo_sysfs_init);
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