1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
|
/*
* Processor cache information made available to userspace via sysfs;
* intended to be compatible with x86 intel_cacheinfo implementation.
*
* Copyright 2008 IBM Corporation
* Author: Nathan Lynch
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*/
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/percpu.h>
#include <asm/prom.h>
#include "cacheinfo.h"
/* per-cpu object for tracking:
* - a "cache" kobject for the top-level directory
* - a list of "index" objects representing the cpu's local cache hierarchy
*/
struct cache_dir {
struct kobject *kobj; /* bare (not embedded) kobject for cache
* directory */
struct cache_index_dir *index; /* list of index objects */
};
/* "index" object: each cpu's cache directory has an index
* subdirectory corresponding to a cache object associated with the
* cpu. This object's lifetime is managed via the embedded kobject.
*/
struct cache_index_dir {
struct kobject kobj;
struct cache_index_dir *next; /* next index in parent directory */
struct cache *cache;
};
/* Template for determining which OF properties to query for a given
* cache type */
struct cache_type_info {
const char *name;
const char *size_prop;
/* Allow for both [di]-cache-line-size and
* [di]-cache-block-size properties. According to the PowerPC
* Processor binding, -line-size should be provided if it
* differs from the cache block size (that which is operated
* on by cache instructions), so we look for -line-size first.
* See cache_get_line_size(). */
const char *line_size_props[2];
const char *nr_sets_prop;
};
/* These are used to index the cache_type_info array. */
#define CACHE_TYPE_UNIFIED 0
#define CACHE_TYPE_INSTRUCTION 1
#define CACHE_TYPE_DATA 2
static const struct cache_type_info cache_type_info[] = {
{
/* PowerPC Processor binding says the [di]-cache-*
* must be equal on unified caches, so just use
* d-cache properties. */
.name = "Unified",
.size_prop = "d-cache-size",
.line_size_props = { "d-cache-line-size",
"d-cache-block-size", },
.nr_sets_prop = "d-cache-sets",
},
{
.name = "Instruction",
.size_prop = "i-cache-size",
.line_size_props = { "i-cache-line-size",
"i-cache-block-size", },
.nr_sets_prop = "i-cache-sets",
},
{
.name = "Data",
.size_prop = "d-cache-size",
.line_size_props = { "d-cache-line-size",
"d-cache-block-size", },
.nr_sets_prop = "d-cache-sets",
},
};
/* Cache object: each instance of this corresponds to a distinct cache
* in the system. There are separate objects for Harvard caches: one
* each for instruction and data, and each refers to the same OF node.
* The refcount of the OF node is elevated for the lifetime of the
* cache object. A cache object is released when its shared_cpu_map
* is cleared (see cache_cpu_clear).
*
* A cache object is on two lists: an unsorted global list
* (cache_list) of cache objects; and a singly-linked list
* representing the local cache hierarchy, which is ordered by level
* (e.g. L1d -> L1i -> L2 -> L3).
*/
struct cache {
struct device_node *ofnode; /* OF node for this cache, may be cpu */
struct cpumask shared_cpu_map; /* online CPUs using this cache */
int type; /* split cache disambiguation */
int level; /* level not explicit in device tree */
struct list_head list; /* global list of cache objects */
struct cache *next_local; /* next cache of >= level */
};
static DEFINE_PER_CPU(struct cache_dir *, cache_dir_pcpu);
/* traversal/modification of this list occurs only at cpu hotplug time;
* access is serialized by cpu hotplug locking
*/
static LIST_HEAD(cache_list);
static struct cache_index_dir *kobj_to_cache_index_dir(struct kobject *k)
{
return container_of(k, struct cache_index_dir, kobj);
}
static const char *cache_type_string(const struct cache *cache)
{
return cache_type_info[cache->type].name;
}
static void __cpuinit cache_init(struct cache *cache, int type, int level, struct device_node *ofnode)
{
cache->type = type;
cache->level = level;
cache->ofnode = of_node_get(ofnode);
INIT_LIST_HEAD(&cache->list);
list_add(&cache->list, &cache_list);
}
static struct cache *__cpuinit new_cache(int type, int level, struct device_node *ofnode)
{
struct cache *cache;
cache = kzalloc(sizeof(*cache), GFP_KERNEL);
if (cache)
cache_init(cache, type, level, ofnode);
return cache;
}
static void release_cache_debugcheck(struct cache *cache)
{
struct cache *iter;
list_for_each_entry(iter, &cache_list, list)
WARN_ONCE(iter->next_local == cache,
"cache for %s(%s) refers to cache for %s(%s)\n",
iter->ofnode->full_name,
cache_type_string(iter),
cache->ofnode->full_name,
cache_type_string(cache));
}
static void release_cache(struct cache *cache)
{
if (!cache)
return;
pr_debug("freeing L%d %s cache for %s\n", cache->level,
cache_type_string(cache), cache->ofnode->full_name);
release_cache_debugcheck(cache);
list_del(&cache->list);
of_node_put(cache->ofnode);
kfree(cache);
}
static void cache_cpu_set(struct cache *cache, int cpu)
{
struct cache *next = cache;
while (next) {
WARN_ONCE(cpumask_test_cpu(cpu, &next->shared_cpu_map),
"CPU %i already accounted in %s(%s)\n",
cpu, next->ofnode->full_name,
cache_type_string(next));
cpumask_set_cpu(cpu, &next->shared_cpu_map);
next = next->next_local;
}
}
static int cache_size(const struct cache *cache, unsigned int *ret)
{
const char *propname;
const u32 *cache_size;
propname = cache_type_info[cache->type].size_prop;
cache_size = of_get_property(cache->ofnode
|