1 #include <stdbool.h>
2 #include <stdint.h>
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6
7 #if !defined(__ANDROID__)
8 /*
9 * sched.h is only used for CPU_SETSIZE constant.
10 * Android NDK headers before platform 21 do have this constant in sched.h
11 */
12 #include <sched.h>
13 #endif
14
15 #include <cpuinfo/log.h>
16 #include <linux/api.h>
17
18 #define STRINGIFY(token) #token
19
20 #define KERNEL_MAX_FILENAME "/sys/devices/system/cpu/kernel_max"
21 #define KERNEL_MAX_FILESIZE 32
22 #define FREQUENCY_FILENAME_SIZE \
23 (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/cpufreq/cpuinfo_max_freq"))
24 #define CUR_FREQUENCY_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/cpufreq/cpuinfo_cur_freq"
25 #define MAX_FREQUENCY_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/cpufreq/cpuinfo_max_freq"
26 #define MIN_FREQUENCY_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/cpufreq/cpuinfo_min_freq"
27 #define FREQUENCY_FILESIZE 32
28 #define PACKAGE_ID_FILENAME_SIZE \
29 (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/physical_package_id"))
30 #define PACKAGE_ID_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/physical_package_id"
31 #define PACKAGE_ID_FILESIZE 32
32 #define CORE_ID_FILENAME_SIZE (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/core_id"))
33 #define CORE_ID_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/core_id"
34 #define CORE_ID_FILESIZE 32
35
36 #define CORE_CPUS_FILENAME_SIZE (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/core_cpus_list"))
37 #define CORE_CPUS_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/core_cpus_list"
38 #define CORE_SIBLINGS_FILENAME_SIZE \
39 (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/core_siblings_list"))
40 #define CORE_SIBLINGS_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/core_siblings_list"
41 #define CLUSTER_CPUS_FILENAME_SIZE \
42 (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/cluster_cpus_list"))
43 #define CLUSTER_CPUS_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/cluster_cpus_list"
44 #define PACKAGE_CPUS_FILENAME_SIZE \
45 (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/package_cpus_list"))
46 #define PACKAGE_CPUS_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/package_cpus_list"
47 #define THREAD_SIBLINGS_FILENAME_SIZE \
48 (sizeof("/sys/devices/system/cpu/cpu" STRINGIFY(UINT32_MAX) "/topology/thread_siblings_list"))
49 #define THREAD_SIBLINGS_FILENAME_FORMAT "/sys/devices/system/cpu/cpu%" PRIu32 "/topology/thread_siblings_list"
50
51 #define POSSIBLE_CPULIST_FILENAME "/sys/devices/system/cpu/possible"
52 #define PRESENT_CPULIST_FILENAME "/sys/devices/system/cpu/present"
53
parse_number(const char * start,const char * end,uint32_t number_ptr[restrict static1])54 inline static const char* parse_number(const char* start, const char* end, uint32_t number_ptr[restrict static 1]) {
55 uint32_t number = 0;
56 const char* parsed = start;
57 for (; parsed != end; parsed++) {
58 const uint32_t digit = (uint32_t)(uint8_t)(*parsed) - (uint32_t)'0';
59 if (digit >= 10) {
60 break;
61 }
62 number = number * UINT32_C(10) + digit;
63 }
64 *number_ptr = number;
65 return parsed;
66 }
67
68 /* Locale-independent */
is_whitespace(char c)69 inline static bool is_whitespace(char c) {
70 switch (c) {
71 case ' ':
72 case '\t':
73 case '\n':
74 case '\r':
75 return true;
76 default:
77 return false;
78 }
79 }
80
81 #if defined(__ANDROID__) && !defined(CPU_SETSIZE)
82 /*
83 * Android NDK headers before platform 21 do not define CPU_SETSIZE,
84 * so we hard-code its value, as defined in platform 21 headers
85 */
86 #if defined(__LP64__)
87 static const uint32_t default_max_processors_count = 1024;
88 #else
89 static const uint32_t default_max_processors_count = 32;
90 #endif
91 #else
92 static const uint32_t default_max_processors_count = CPU_SETSIZE;
93 #endif
94
uint32_parser(const char * filename,const char * text_start,const char * text_end,void * context)95 static bool uint32_parser(const char* filename, const char* text_start, const char* text_end, void* context) {
96 if (text_start == text_end) {
97 cpuinfo_log_error("failed to parse file %s: file is empty", KERNEL_MAX_FILENAME);
98 return false;
99 }
100
101 uint32_t kernel_max = 0;
102 const char* parsed_end = parse_number(text_start, text_end, &kernel_max);
103 if (parsed_end == text_start) {
104 cpuinfo_log_error(
105 "failed to parse file %s: \"%.*s\" is not an unsigned number",
106 filename,
107 (int)(text_end - text_start),
108 text_start);
109 return false;
110 } else {
111 for (const char* char_ptr = parsed_end; char_ptr != text_end; char_ptr++) {
112 if (!is_whitespace(*char_ptr)) {
113 cpuinfo_log_warning(
114 "non-whitespace characters \"%.*s\" following number in file %s are ignored",
115 (int)(text_end - char_ptr),
116 char_ptr,
117 filename);
118 break;
119 }
120 }
121 }
122
123 uint32_t* kernel_max_ptr = (uint32_t*)context;
124 *kernel_max_ptr = kernel_max;
125 return true;
126 }
127
cpuinfo_linux_get_max_processors_count(void)128 uint32_t cpuinfo_linux_get_max_processors_count(void) {
129 uint32_t kernel_max;
130 if (cpuinfo_linux_parse_small_file(KERNEL_MAX_FILENAME, KERNEL_MAX_FILESIZE, uint32_parser, &kernel_max)) {
131 cpuinfo_log_debug("parsed kernel_max value of %" PRIu32 " from %s", kernel_max, KERNEL_MAX_FILENAME);
132
133 if (kernel_max >= default_max_processors_count) {
134 cpuinfo_log_warning(
135 "kernel_max value of %" PRIu32
136 " parsed from %s exceeds platform-default limit %" PRIu32,
137 kernel_max,
138 KERNEL_MAX_FILENAME,
139 default_max_processors_count - 1);
140 }
141
142 return kernel_max + 1;
143 } else {
144 cpuinfo_log_warning(
145 "using platform-default max processors count = %" PRIu32, default_max_processors_count);
146 return default_max_processors_count;
147 }
148 }
149
cpuinfo_linux_get_processor_cur_frequency(uint32_t processor)150 uint32_t cpuinfo_linux_get_processor_cur_frequency(uint32_t processor) {
151 char cur_frequency_filename[FREQUENCY_FILENAME_SIZE];
152 const int chars_formatted =
153 snprintf(cur_frequency_filename, FREQUENCY_FILENAME_SIZE, CUR_FREQUENCY_FILENAME_FORMAT, processor);
154 if ((unsigned int)chars_formatted >= FREQUENCY_FILENAME_SIZE) {
155 cpuinfo_log_warning("failed to format filename for current frequency of processor %" PRIu32, processor);
156 return 0;
157 }
158
159 uint32_t cur_frequency;
160 if (cpuinfo_linux_parse_small_file(cur_frequency_filename, FREQUENCY_FILESIZE, uint32_parser, &cur_frequency)) {
161 cpuinfo_log_debug(
162 "parsed currrent frequency value of %" PRIu32 " KHz for logical processor %" PRIu32 " from %s",
163 cur_frequency,
164 processor,
165 cur_frequency_filename);
166 return cur_frequency;
167 } else {
168 cpuinfo_log_warning(
169 "failed to parse current frequency for processor %" PRIu32 " from %s",
170 processor,
171 cur_frequency_filename);
172 return 0;
173 }
174 }
175
cpuinfo_linux_get_processor_max_frequency(uint32_t processor)176 uint32_t cpuinfo_linux_get_processor_max_frequency(uint32_t processor) {
177 char max_frequency_filename[FREQUENCY_FILENAME_SIZE];
178 const int chars_formatted =
179 snprintf(max_frequency_filename, FREQUENCY_FILENAME_SIZE, MAX_FREQUENCY_FILENAME_FORMAT, processor);
180 if ((unsigned int)chars_formatted >= FREQUENCY_FILENAME_SIZE) {
181 cpuinfo_log_warning("failed to format filename for max frequency of processor %" PRIu32, processor);
182 return 0;
183 }
184
185 uint32_t max_frequency;
186 if (cpuinfo_linux_parse_small_file(max_frequency_filename, FREQUENCY_FILESIZE, uint32_parser, &max_frequency)) {
187 cpuinfo_log_debug(
188 "parsed max frequency value of %" PRIu32 " KHz for logical processor %" PRIu32 " from %s",
189 max_frequency,
190 processor,
191 max_frequency_filename);
192 return max_frequency;
193 } else {
194 cpuinfo_log_warning(
195 "failed to parse max frequency for processor %" PRIu32 " from %s",
196 processor,
197 max_frequency_filename);
198 return 0;
199 }
200 }
201
cpuinfo_linux_get_processor_min_frequency(uint32_t processor)202 uint32_t cpuinfo_linux_get_processor_min_frequency(uint32_t processor) {
203 char min_frequency_filename[FREQUENCY_FILENAME_SIZE];
204 const int chars_formatted =
205 snprintf(min_frequency_filename, FREQUENCY_FILENAME_SIZE, MIN_FREQUENCY_FILENAME_FORMAT, processor);
206 if ((unsigned int)chars_formatted >= FREQUENCY_FILENAME_SIZE) {
207 cpuinfo_log_warning("failed to format filename for min frequency of processor %" PRIu32, processor);
208 return 0;
209 }
210
211 uint32_t min_frequency;
212 if (cpuinfo_linux_parse_small_file(min_frequency_filename, FREQUENCY_FILESIZE, uint32_parser, &min_frequency)) {
213 cpuinfo_log_debug(
214 "parsed min frequency value of %" PRIu32 " KHz for logical processor %" PRIu32 " from %s",
215 min_frequency,
216 processor,
217 min_frequency_filename);
218 return min_frequency;
219 } else {
220 /*
221 * This error is less severe than parsing max frequency, because
222 * min frequency is only useful for clustering, while max
223 * frequency is also needed for peak FLOPS calculation.
224 */
225 cpuinfo_log_info(
226 "failed to parse min frequency for processor %" PRIu32 " from %s",
227 processor,
228 min_frequency_filename);
229 return 0;
230 }
231 }
232
cpuinfo_linux_get_processor_core_id(uint32_t processor,uint32_t core_id_ptr[restrict static1])233 bool cpuinfo_linux_get_processor_core_id(uint32_t processor, uint32_t core_id_ptr[restrict static 1]) {
234 char core_id_filename[PACKAGE_ID_FILENAME_SIZE];
235 const int chars_formatted =
236 snprintf(core_id_filename, CORE_ID_FILENAME_SIZE, CORE_ID_FILENAME_FORMAT, processor);
237 if ((unsigned int)chars_formatted >= CORE_ID_FILENAME_SIZE) {
238 cpuinfo_log_warning("failed to format filename for core id of processor %" PRIu32, processor);
239 return 0;
240 }
241
242 uint32_t core_id;
243 if (cpuinfo_linux_parse_small_file(core_id_filename, CORE_ID_FILESIZE, uint32_parser, &core_id)) {
244 cpuinfo_log_debug(
245 "parsed core id value of %" PRIu32 " for logical processor %" PRIu32 " from %s",
246 core_id,
247 processor,
248 core_id_filename);
249 *core_id_ptr = core_id;
250 return true;
251 } else {
252 cpuinfo_log_info(
253 "failed to parse core id for processor %" PRIu32 " from %s", processor, core_id_filename);
254 return false;
255 }
256 }
257
cpuinfo_linux_get_processor_package_id(uint32_t processor,uint32_t package_id_ptr[restrict static1])258 bool cpuinfo_linux_get_processor_package_id(uint32_t processor, uint32_t package_id_ptr[restrict static 1]) {
259 char package_id_filename[PACKAGE_ID_FILENAME_SIZE];
260 const int chars_formatted =
261 snprintf(package_id_filename, PACKAGE_ID_FILENAME_SIZE, PACKAGE_ID_FILENAME_FORMAT, processor);
262 if ((unsigned int)chars_formatted >= PACKAGE_ID_FILENAME_SIZE) {
263 cpuinfo_log_warning("failed to format filename for package id of processor %" PRIu32, processor);
264 return 0;
265 }
266
267 uint32_t package_id;
268 if (cpuinfo_linux_parse_small_file(package_id_filename, PACKAGE_ID_FILESIZE, uint32_parser, &package_id)) {
269 cpuinfo_log_debug(
270 "parsed package id value of %" PRIu32 " for logical processor %" PRIu32 " from %s",
271 package_id,
272 processor,
273 package_id_filename);
274 *package_id_ptr = package_id;
275 return true;
276 } else {
277 cpuinfo_log_info(
278 "failed to parse package id for processor %" PRIu32 " from %s", processor, package_id_filename);
279 return false;
280 }
281 }
282
max_processor_number_parser(uint32_t processor_list_start,uint32_t processor_list_end,void * context)283 static bool max_processor_number_parser(uint32_t processor_list_start, uint32_t processor_list_end, void* context) {
284 uint32_t* processor_number_ptr = (uint32_t*)context;
285 const uint32_t processor_list_last = processor_list_end - 1;
286 if (*processor_number_ptr < processor_list_last) {
287 *processor_number_ptr = processor_list_last;
288 }
289 return true;
290 }
291
cpuinfo_linux_get_max_possible_processor(uint32_t max_processors_count)292 uint32_t cpuinfo_linux_get_max_possible_processor(uint32_t max_processors_count) {
293 uint32_t max_possible_processor = 0;
294 if (!cpuinfo_linux_parse_cpulist(
295 POSSIBLE_CPULIST_FILENAME, max_processor_number_parser, &max_possible_processor)) {
296 #if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
297 cpuinfo_log_error("failed to parse the list of possible processors in %s", POSSIBLE_CPULIST_FILENAME);
298 #else
299 cpuinfo_log_warning("failed to parse the list of possible processors in %s", POSSIBLE_CPULIST_FILENAME);
300 #endif
301 return UINT32_MAX;
302 }
303 if (max_possible_processor >= max_processors_count) {
304 cpuinfo_log_warning(
305 "maximum possible processor number %" PRIu32 " exceeds system limit %" PRIu32
306 ": truncating to the latter",
307 max_possible_processor,
308 max_processors_count - 1);
309 max_possible_processor = max_processors_count - 1;
310 }
311 return max_possible_processor;
312 }
313
cpuinfo_linux_get_max_present_processor(uint32_t max_processors_count)314 uint32_t cpuinfo_linux_get_max_present_processor(uint32_t max_processors_count) {
315 uint32_t max_present_processor = 0;
316 if (!cpuinfo_linux_parse_cpulist(
317 PRESENT_CPULIST_FILENAME, max_processor_number_parser, &max_present_processor)) {
318 #if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
319 cpuinfo_log_error("failed to parse the list of present processors in %s", PRESENT_CPULIST_FILENAME);
320 #else
321 cpuinfo_log_warning("failed to parse the list of present processors in %s", PRESENT_CPULIST_FILENAME);
322 #endif
323 return UINT32_MAX;
324 }
325 if (max_present_processor >= max_processors_count) {
326 cpuinfo_log_warning(
327 "maximum present processor number %" PRIu32 " exceeds system limit %" PRIu32
328 ": truncating to the latter",
329 max_present_processor,
330 max_processors_count - 1);
331 max_present_processor = max_processors_count - 1;
332 }
333 return max_present_processor;
334 }
335
336 struct detect_processors_context {
337 uint32_t max_processors_count;
338 uint32_t* processor0_flags;
339 uint32_t processor_struct_size;
340 uint32_t detected_flag;
341 };
342
detect_processor_parser(uint32_t processor_list_start,uint32_t processor_list_end,void * context)343 static bool detect_processor_parser(uint32_t processor_list_start, uint32_t processor_list_end, void* context) {
344 const uint32_t max_processors_count = ((struct detect_processors_context*)context)->max_processors_count;
345 const uint32_t* processor0_flags = ((struct detect_processors_context*)context)->processor0_flags;
346 const uint32_t processor_struct_size = ((struct detect_processors_context*)context)->processor_struct_size;
347 const uint32_t detected_flag = ((struct detect_processors_context*)context)->detected_flag;
348
349 for (uint32_t processor = processor_list_start; processor < processor_list_end; processor++) {
350 if (processor >= max_processors_count) {
351 break;
352 }
353 *((uint32_t*)((uintptr_t)processor0_flags + processor_struct_size * processor)) |= detected_flag;
354 }
355 return true;
356 }
357
cpuinfo_linux_detect_possible_processors(uint32_t max_processors_count,uint32_t * processor0_flags,uint32_t processor_struct_size,uint32_t possible_flag)358 bool cpuinfo_linux_detect_possible_processors(
359 uint32_t max_processors_count,
360 uint32_t* processor0_flags,
361 uint32_t processor_struct_size,
362 uint32_t possible_flag) {
363 struct detect_processors_context context = {
364 .max_processors_count = max_processors_count,
365 .processor0_flags = processor0_flags,
366 .processor_struct_size = processor_struct_size,
367 .detected_flag = possible_flag,
368 };
369 if (cpuinfo_linux_parse_cpulist(POSSIBLE_CPULIST_FILENAME, detect_processor_parser, &context)) {
370 return true;
371 } else {
372 cpuinfo_log_warning("failed to parse the list of possible processors in %s", POSSIBLE_CPULIST_FILENAME);
373 return false;
374 }
375 }
376
cpuinfo_linux_detect_present_processors(uint32_t max_processors_count,uint32_t * processor0_flags,uint32_t processor_struct_size,uint32_t present_flag)377 bool cpuinfo_linux_detect_present_processors(
378 uint32_t max_processors_count,
379 uint32_t* processor0_flags,
380 uint32_t processor_struct_size,
381 uint32_t present_flag) {
382 struct detect_processors_context context = {
383 .max_processors_count = max_processors_count,
384 .processor0_flags = processor0_flags,
385 .processor_struct_size = processor_struct_size,
386 .detected_flag = present_flag,
387 };
388 if (cpuinfo_linux_parse_cpulist(PRESENT_CPULIST_FILENAME, detect_processor_parser, &context)) {
389 return true;
390 } else {
391 cpuinfo_log_warning("failed to parse the list of present processors in %s", PRESENT_CPULIST_FILENAME);
392 return false;
393 }
394 }
395
396 struct siblings_context {
397 const char* group_name;
398 uint32_t max_processors_count;
399 uint32_t processor;
400 cpuinfo_siblings_callback callback;
401 void* callback_context;
402 };
403
siblings_parser(uint32_t sibling_list_start,uint32_t sibling_list_end,struct siblings_context * context)404 static bool siblings_parser(uint32_t sibling_list_start, uint32_t sibling_list_end, struct siblings_context* context) {
405 const char* group_name = context->group_name;
406 const uint32_t max_processors_count = context->max_processors_count;
407 const uint32_t processor = context->processor;
408
409 if (sibling_list_end > max_processors_count) {
410 cpuinfo_log_warning(
411 "ignore %s siblings %" PRIu32 "-%" PRIu32 " of processor %" PRIu32,
412 group_name,
413 max_processors_count,
414 sibling_list_end - 1,
415 processor);
416 sibling_list_end = max_processors_count;
417 }
418
419 return context->callback(processor, sibling_list_start, sibling_list_end, context->callback_context);
420 }
421
cpuinfo_linux_detect_core_cpus(uint32_t max_processors_count,uint32_t processor,cpuinfo_siblings_callback callback,void * context)422 bool cpuinfo_linux_detect_core_cpus(
423 uint32_t max_processors_count,
424 uint32_t processor,
425 cpuinfo_siblings_callback callback,
426 void* context) {
427 char core_cpus_filename[CORE_CPUS_FILENAME_SIZE];
428 const int chars_formatted =
429 snprintf(core_cpus_filename, CORE_CPUS_FILENAME_SIZE, CORE_CPUS_FILENAME_FORMAT, processor);
430 if ((unsigned int)chars_formatted >= CORE_CPUS_FILENAME_SIZE) {
431 cpuinfo_log_warning("failed to format filename for core cpus of processor %" PRIu32, processor);
432 return false;
433 }
434
435 struct siblings_context siblings_context = {
436 .group_name = "cpus",
437 .max_processors_count = max_processors_count,
438 .processor = processor,
439 .callback = callback,
440 .callback_context = context,
441 };
442 if (cpuinfo_linux_parse_cpulist(
443 core_cpus_filename, (cpuinfo_cpulist_callback)siblings_parser, &siblings_context)) {
444 return true;
445 } else {
446 cpuinfo_log_info(
447 "failed to parse the list of core cpus for processor %" PRIu32 " from %s",
448 processor,
449 core_cpus_filename);
450 return false;
451 }
452 }
453
cpuinfo_linux_detect_core_siblings(uint32_t max_processors_count,uint32_t processor,cpuinfo_siblings_callback callback,void * context)454 bool cpuinfo_linux_detect_core_siblings(
455 uint32_t max_processors_count,
456 uint32_t processor,
457 cpuinfo_siblings_callback callback,
458 void* context) {
459 char core_siblings_filename[CORE_SIBLINGS_FILENAME_SIZE];
460 const int chars_formatted =
461 snprintf(core_siblings_filename, CORE_SIBLINGS_FILENAME_SIZE, CORE_SIBLINGS_FILENAME_FORMAT, processor);
462 if ((unsigned int)chars_formatted >= CORE_SIBLINGS_FILENAME_SIZE) {
463 cpuinfo_log_warning("failed to format filename for core siblings of processor %" PRIu32, processor);
464 return false;
465 }
466
467 struct siblings_context siblings_context = {
468 .group_name = "package",
469 .max_processors_count = max_processors_count,
470 .processor = processor,
471 .callback = callback,
472 .callback_context = context,
473 };
474 if (cpuinfo_linux_parse_cpulist(
475 core_siblings_filename, (cpuinfo_cpulist_callback)siblings_parser, &siblings_context)) {
476 return true;
477 } else {
478 cpuinfo_log_info(
479 "failed to parse the list of core siblings for processor %" PRIu32 " from %s",
480 processor,
481 core_siblings_filename);
482 return false;
483 }
484 }
485
cpuinfo_linux_detect_thread_siblings(uint32_t max_processors_count,uint32_t processor,cpuinfo_siblings_callback callback,void * context)486 bool cpuinfo_linux_detect_thread_siblings(
487 uint32_t max_processors_count,
488 uint32_t processor,
489 cpuinfo_siblings_callback callback,
490 void* context) {
491 char thread_siblings_filename[THREAD_SIBLINGS_FILENAME_SIZE];
492 const int chars_formatted = snprintf(
493 thread_siblings_filename, THREAD_SIBLINGS_FILENAME_SIZE, THREAD_SIBLINGS_FILENAME_FORMAT, processor);
494 if ((unsigned int)chars_formatted >= THREAD_SIBLINGS_FILENAME_SIZE) {
495 cpuinfo_log_warning("failed to format filename for thread siblings of processor %" PRIu32, processor);
496 return false;
497 }
498
499 struct siblings_context siblings_context = {
500 .group_name = "core",
501 .max_processors_count = max_processors_count,
502 .processor = processor,
503 .callback = callback,
504 .callback_context = context,
505 };
506 if (cpuinfo_linux_parse_cpulist(
507 thread_siblings_filename, (cpuinfo_cpulist_callback)siblings_parser, &siblings_context)) {
508 return true;
509 } else {
510 cpuinfo_log_info(
511 "failed to parse the list of thread siblings for processor %" PRIu32 " from %s",
512 processor,
513 thread_siblings_filename);
514 return false;
515 }
516 }
517
cpuinfo_linux_detect_cluster_cpus(uint32_t max_processors_count,uint32_t processor,cpuinfo_siblings_callback callback,void * context)518 bool cpuinfo_linux_detect_cluster_cpus(
519 uint32_t max_processors_count,
520 uint32_t processor,
521 cpuinfo_siblings_callback callback,
522 void* context) {
523 char cluster_cpus_filename[CLUSTER_CPUS_FILENAME_SIZE];
524 const int chars_formatted =
525 snprintf(cluster_cpus_filename, CLUSTER_CPUS_FILENAME_SIZE, CLUSTER_CPUS_FILENAME_FORMAT, processor);
526 if ((unsigned int)chars_formatted >= CLUSTER_CPUS_FILENAME_SIZE) {
527 cpuinfo_log_warning("failed to format filename for cluster cpus of processor %" PRIu32, processor);
528 return false;
529 }
530
531 struct siblings_context siblings_context = {
532 .group_name = "cluster",
533 .max_processors_count = max_processors_count,
534 .processor = processor,
535 .callback = callback,
536 .callback_context = context,
537 };
538 if (cpuinfo_linux_parse_cpulist(
539 cluster_cpus_filename, (cpuinfo_cpulist_callback)siblings_parser, &siblings_context)) {
540 return true;
541 } else {
542 cpuinfo_log_info(
543 "failed to parse the list of cluster cpus for processor %" PRIu32 " from %s",
544 processor,
545 cluster_cpus_filename);
546 return false;
547 }
548 }
549
cpuinfo_linux_detect_package_cpus(uint32_t max_processors_count,uint32_t processor,cpuinfo_siblings_callback callback,void * context)550 bool cpuinfo_linux_detect_package_cpus(
551 uint32_t max_processors_count,
552 uint32_t processor,
553 cpuinfo_siblings_callback callback,
554 void* context) {
555 char package_cpus_filename[PACKAGE_CPUS_FILENAME_SIZE];
556 const int chars_formatted =
557 snprintf(package_cpus_filename, PACKAGE_CPUS_FILENAME_SIZE, PACKAGE_CPUS_FILENAME_FORMAT, processor);
558 if ((unsigned int)chars_formatted >= PACKAGE_CPUS_FILENAME_SIZE) {
559 cpuinfo_log_warning("failed to format filename for package cpus of processor %" PRIu32, processor);
560 return false;
561 }
562
563 struct siblings_context siblings_context = {
564 .group_name = "package",
565 .max_processors_count = max_processors_count,
566 .processor = processor,
567 .callback = callback,
568 .callback_context = context,
569 };
570 if (cpuinfo_linux_parse_cpulist(
571 package_cpus_filename, (cpuinfo_cpulist_callback)siblings_parser, &siblings_context)) {
572 return true;
573 } else {
574 cpuinfo_log_info(
575 "failed to parse the list of package cpus for processor %" PRIu32 " from %s",
576 processor,
577 package_cpus_filename);
578 return false;
579 }
580 }
581