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ebabbf58 MD |
1 | /* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only) |
2 | * | |
3 | * counter.c | |
4 | * | |
5 | * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
6 | */ | |
7 | ||
ebabbf58 MD |
8 | #include <errno.h> |
9 | #include "counter.h" | |
10 | #include "counter-internal.h" | |
ebabbf58 MD |
11 | #include <urcu/system.h> |
12 | #include <urcu/compiler.h> | |
13 | #include <stdbool.h> | |
9d315d6d MJ |
14 | |
15 | #include "common/macros.h" | |
16 | #include "common/align.h" | |
17 | #include "common/bitmap.h" | |
18 | ||
74cc1f59 | 19 | #include "common/smp.h" |
ebabbf58 | 20 | #include "shm.h" |
b7b5cf30 | 21 | |
ebabbf58 MD |
22 | static size_t lttng_counter_get_dimension_nr_elements(struct lib_counter_dimension *dimension) |
23 | { | |
24 | return dimension->max_nr_elem; | |
25 | } | |
26 | ||
2208d8b5 MJ |
27 | static int lttng_counter_init_stride( |
28 | const struct lib_counter_config *config __attribute__((unused)), | |
29 | struct lib_counter *counter) | |
ebabbf58 MD |
30 | { |
31 | size_t nr_dimensions = counter->nr_dimensions; | |
32 | size_t stride = 1; | |
33 | ssize_t i; | |
34 | ||
35 | for (i = nr_dimensions - 1; i >= 0; i--) { | |
36 | struct lib_counter_dimension *dimension = &counter->dimensions[i]; | |
37 | size_t nr_elem; | |
38 | ||
39 | nr_elem = lttng_counter_get_dimension_nr_elements(dimension); | |
40 | dimension->stride = stride; | |
41 | /* nr_elem should be minimum 1 for each dimension. */ | |
42 | if (!nr_elem) | |
43 | return -EINVAL; | |
44 | stride *= nr_elem; | |
45 | if (stride > SIZE_MAX / nr_elem) | |
46 | return -EINVAL; | |
47 | } | |
48 | return 0; | |
49 | } | |
50 | ||
51 | static int lttng_counter_layout_init(struct lib_counter *counter, int cpu, int shm_fd) | |
52 | { | |
53 | struct lib_counter_layout *layout; | |
54 | size_t counter_size; | |
55 | size_t nr_elem = counter->allocated_elem; | |
56 | size_t shm_length = 0, counters_offset, overflow_offset, underflow_offset; | |
57 | struct lttng_counter_shm_object *shm_object; | |
58 | ||
59 | if (shm_fd < 0) | |
60 | return 0; /* Skip, will be populated later. */ | |
61 | ||
62 | if (cpu == -1) | |
63 | layout = &counter->global_counters; | |
64 | else | |
65 | layout = &counter->percpu_counters[cpu]; | |
66 | switch (counter->config.counter_size) { | |
67 | case COUNTER_SIZE_8_BIT: | |
68 | case COUNTER_SIZE_16_BIT: | |
69 | case COUNTER_SIZE_32_BIT: | |
70 | case COUNTER_SIZE_64_BIT: | |
71 | counter_size = (size_t) counter->config.counter_size; | |
72 | break; | |
73 | default: | |
74 | return -EINVAL; | |
75 | } | |
76 | layout->shm_fd = shm_fd; | |
77 | counters_offset = shm_length; | |
78 | shm_length += counter_size * nr_elem; | |
79 | overflow_offset = shm_length; | |
00adec46 | 80 | shm_length += LTTNG_UST_ALIGN(nr_elem, 8) / 8; |
ebabbf58 | 81 | underflow_offset = shm_length; |
00adec46 | 82 | shm_length += LTTNG_UST_ALIGN(nr_elem, 8) / 8; |
ebabbf58 MD |
83 | layout->shm_len = shm_length; |
84 | if (counter->is_daemon) { | |
85 | /* Allocate and clear shared memory. */ | |
86 | shm_object = lttng_counter_shm_object_table_alloc(counter->object_table, | |
87 | shm_length, LTTNG_COUNTER_SHM_OBJECT_SHM, shm_fd, cpu); | |
88 | if (!shm_object) | |
89 | return -ENOMEM; | |
90 | } else { | |
91 | /* Map pre-existing shared memory. */ | |
92 | shm_object = lttng_counter_shm_object_table_append_shm(counter->object_table, | |
93 | shm_fd, shm_length); | |
94 | if (!shm_object) | |
95 | return -ENOMEM; | |
96 | } | |
97 | layout->counters = shm_object->memory_map + counters_offset; | |
98 | layout->overflow_bitmap = (unsigned long *)(shm_object->memory_map + overflow_offset); | |
99 | layout->underflow_bitmap = (unsigned long *)(shm_object->memory_map + underflow_offset); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | int lttng_counter_set_global_shm(struct lib_counter *counter, int fd) | |
104 | { | |
105 | struct lib_counter_config *config = &counter->config; | |
106 | struct lib_counter_layout *layout; | |
107 | ||
108 | if (!(config->alloc & COUNTER_ALLOC_GLOBAL)) | |
109 | return -EINVAL; | |
110 | layout = &counter->global_counters; | |
111 | if (layout->shm_fd >= 0) | |
112 | return -EBUSY; | |
113 | return lttng_counter_layout_init(counter, -1, fd); | |
114 | } | |
115 | ||
116 | int lttng_counter_set_cpu_shm(struct lib_counter *counter, int cpu, int fd) | |
117 | { | |
118 | struct lib_counter_config *config = &counter->config; | |
119 | struct lib_counter_layout *layout; | |
120 | ||
74cc1f59 | 121 | if (cpu < 0 || cpu >= num_possible_cpus()) |
ebabbf58 MD |
122 | return -EINVAL; |
123 | ||
124 | if (!(config->alloc & COUNTER_ALLOC_PER_CPU)) | |
125 | return -EINVAL; | |
126 | layout = &counter->percpu_counters[cpu]; | |
127 | if (layout->shm_fd >= 0) | |
128 | return -EBUSY; | |
129 | return lttng_counter_layout_init(counter, cpu, fd); | |
130 | } | |
131 | ||
132 | static | |
133 | int lttng_counter_set_global_sum_step(struct lib_counter *counter, | |
134 | int64_t global_sum_step) | |
135 | { | |
136 | if (global_sum_step < 0) | |
137 | return -EINVAL; | |
138 | ||
139 | switch (counter->config.counter_size) { | |
140 | case COUNTER_SIZE_8_BIT: | |
141 | if (global_sum_step > INT8_MAX) | |
142 | return -EINVAL; | |
143 | counter->global_sum_step.s8 = (int8_t) global_sum_step; | |
144 | break; | |
145 | case COUNTER_SIZE_16_BIT: | |
146 | if (global_sum_step > INT16_MAX) | |
147 | return -EINVAL; | |
148 | counter->global_sum_step.s16 = (int16_t) global_sum_step; | |
149 | break; | |
150 | case COUNTER_SIZE_32_BIT: | |
151 | if (global_sum_step > INT32_MAX) | |
152 | return -EINVAL; | |
153 | counter->global_sum_step.s32 = (int32_t) global_sum_step; | |
154 | break; | |
155 | case COUNTER_SIZE_64_BIT: | |
156 | counter->global_sum_step.s64 = global_sum_step; | |
157 | break; | |
158 | default: | |
159 | return -EINVAL; | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static | |
166 | int validate_args(const struct lib_counter_config *config, | |
2208d8b5 | 167 | size_t nr_dimensions __attribute__((unused)), |
ebabbf58 MD |
168 | const size_t *max_nr_elem, |
169 | int64_t global_sum_step, | |
170 | int global_counter_fd, | |
171 | int nr_counter_cpu_fds, | |
172 | const int *counter_cpu_fds) | |
173 | { | |
74cc1f59 | 174 | int nr_cpus = num_possible_cpus(); |
ebabbf58 MD |
175 | |
176 | if (CAA_BITS_PER_LONG != 64 && config->counter_size == COUNTER_SIZE_64_BIT) { | |
177 | WARN_ON_ONCE(1); | |
178 | return -1; | |
179 | } | |
180 | if (!max_nr_elem) | |
181 | return -1; | |
182 | /* | |
183 | * global sum step is only useful with allocating both per-cpu | |
184 | * and global counters. | |
185 | */ | |
186 | if (global_sum_step && (!(config->alloc & COUNTER_ALLOC_GLOBAL) || | |
187 | !(config->alloc & COUNTER_ALLOC_PER_CPU))) | |
188 | return -1; | |
189 | if (!(config->alloc & COUNTER_ALLOC_GLOBAL) && global_counter_fd >= 0) | |
190 | return -1; | |
191 | if (!(config->alloc & COUNTER_ALLOC_PER_CPU) && counter_cpu_fds) | |
192 | return -1; | |
41d6c53d | 193 | if (!(config->alloc & COUNTER_ALLOC_PER_CPU) && nr_counter_cpu_fds >= 0) |
ebabbf58 MD |
194 | return -1; |
195 | if (counter_cpu_fds && nr_cpus != nr_counter_cpu_fds) | |
196 | return -1; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | struct lib_counter *lttng_counter_create(const struct lib_counter_config *config, | |
201 | size_t nr_dimensions, | |
202 | const size_t *max_nr_elem, | |
203 | int64_t global_sum_step, | |
204 | int global_counter_fd, | |
205 | int nr_counter_cpu_fds, | |
206 | const int *counter_cpu_fds, | |
207 | bool is_daemon) | |
208 | { | |
209 | struct lib_counter *counter; | |
210 | size_t dimension, nr_elem = 1; | |
211 | int cpu, ret; | |
212 | int nr_handles = 0; | |
74cc1f59 | 213 | int nr_cpus = num_possible_cpus(); |
ebabbf58 MD |
214 | |
215 | if (validate_args(config, nr_dimensions, max_nr_elem, | |
216 | global_sum_step, global_counter_fd, nr_counter_cpu_fds, | |
217 | counter_cpu_fds)) | |
218 | return NULL; | |
219 | counter = zmalloc(sizeof(struct lib_counter)); | |
220 | if (!counter) | |
221 | return NULL; | |
222 | counter->global_counters.shm_fd = -1; | |
223 | counter->config = *config; | |
224 | counter->is_daemon = is_daemon; | |
225 | if (lttng_counter_set_global_sum_step(counter, global_sum_step)) | |
226 | goto error_sum_step; | |
227 | counter->nr_dimensions = nr_dimensions; | |
228 | counter->dimensions = zmalloc(nr_dimensions * sizeof(*counter->dimensions)); | |
229 | if (!counter->dimensions) | |
230 | goto error_dimensions; | |
231 | for (dimension = 0; dimension < nr_dimensions; dimension++) | |
232 | counter->dimensions[dimension].max_nr_elem = max_nr_elem[dimension]; | |
233 | if (config->alloc & COUNTER_ALLOC_PER_CPU) { | |
234 | counter->percpu_counters = zmalloc(sizeof(struct lib_counter_layout) * nr_cpus); | |
235 | if (!counter->percpu_counters) | |
236 | goto error_alloc_percpu; | |
74cc1f59 | 237 | for_each_possible_cpu(cpu) |
ebabbf58 MD |
238 | counter->percpu_counters[cpu].shm_fd = -1; |
239 | } | |
240 | ||
241 | if (lttng_counter_init_stride(config, counter)) | |
242 | goto error_init_stride; | |
243 | //TODO saturation values. | |
244 | for (dimension = 0; dimension < counter->nr_dimensions; dimension++) | |
245 | nr_elem *= lttng_counter_get_dimension_nr_elements(&counter->dimensions[dimension]); | |
246 | counter->allocated_elem = nr_elem; | |
247 | ||
248 | if (config->alloc & COUNTER_ALLOC_GLOBAL) | |
249 | nr_handles++; | |
250 | if (config->alloc & COUNTER_ALLOC_PER_CPU) | |
251 | nr_handles += nr_cpus; | |
252 | /* Allocate table for global and per-cpu counters. */ | |
253 | counter->object_table = lttng_counter_shm_object_table_create(nr_handles); | |
254 | if (!counter->object_table) | |
255 | goto error_alloc_object_table; | |
256 | ||
257 | if (config->alloc & COUNTER_ALLOC_GLOBAL) { | |
258 | ret = lttng_counter_layout_init(counter, -1, global_counter_fd); /* global */ | |
259 | if (ret) | |
260 | goto layout_init_error; | |
261 | } | |
262 | if ((config->alloc & COUNTER_ALLOC_PER_CPU) && counter_cpu_fds) { | |
74cc1f59 | 263 | for_each_possible_cpu(cpu) { |
ebabbf58 MD |
264 | ret = lttng_counter_layout_init(counter, cpu, counter_cpu_fds[cpu]); |
265 | if (ret) | |
266 | goto layout_init_error; | |
267 | } | |
268 | } | |
269 | return counter; | |
270 | ||
271 | layout_init_error: | |
272 | lttng_counter_shm_object_table_destroy(counter->object_table, is_daemon); | |
273 | error_alloc_object_table: | |
274 | error_init_stride: | |
275 | free(counter->percpu_counters); | |
276 | error_alloc_percpu: | |
277 | free(counter->dimensions); | |
278 | error_dimensions: | |
279 | error_sum_step: | |
280 | free(counter); | |
281 | return NULL; | |
282 | } | |
283 | ||
284 | void lttng_counter_destroy(struct lib_counter *counter) | |
285 | { | |
286 | struct lib_counter_config *config = &counter->config; | |
287 | ||
288 | if (config->alloc & COUNTER_ALLOC_PER_CPU) | |
289 | free(counter->percpu_counters); | |
290 | lttng_counter_shm_object_table_destroy(counter->object_table, counter->is_daemon); | |
291 | free(counter->dimensions); | |
292 | free(counter); | |
293 | } | |
294 | ||
295 | int lttng_counter_get_global_shm(struct lib_counter *counter, int *fd, size_t *len) | |
296 | { | |
297 | int shm_fd; | |
298 | ||
299 | shm_fd = counter->global_counters.shm_fd; | |
300 | if (shm_fd < 0) | |
301 | return -1; | |
302 | *fd = shm_fd; | |
303 | *len = counter->global_counters.shm_len; | |
304 | return 0; | |
305 | } | |
306 | ||
307 | int lttng_counter_get_cpu_shm(struct lib_counter *counter, int cpu, int *fd, size_t *len) | |
308 | { | |
309 | struct lib_counter_layout *layout; | |
310 | int shm_fd; | |
311 | ||
74cc1f59 | 312 | if (cpu >= num_possible_cpus()) |
ebabbf58 MD |
313 | return -1; |
314 | layout = &counter->percpu_counters[cpu]; | |
315 | shm_fd = layout->shm_fd; | |
316 | if (shm_fd < 0) | |
317 | return -1; | |
318 | *fd = shm_fd; | |
319 | *len = layout->shm_len; | |
320 | return 0; | |
321 | } | |
322 | ||
323 | int lttng_counter_read(const struct lib_counter_config *config, | |
324 | struct lib_counter *counter, | |
325 | const size_t *dimension_indexes, | |
326 | int cpu, int64_t *value, bool *overflow, | |
327 | bool *underflow) | |
328 | { | |
329 | size_t index; | |
330 | struct lib_counter_layout *layout; | |
331 | ||
332 | if (caa_unlikely(lttng_counter_validate_indexes(config, counter, dimension_indexes))) | |
333 | return -EOVERFLOW; | |
334 | index = lttng_counter_get_index(config, counter, dimension_indexes); | |
335 | ||
336 | switch (config->alloc) { | |
337 | case COUNTER_ALLOC_PER_CPU: | |
74cc1f59 | 338 | if (cpu < 0 || cpu >= num_possible_cpus()) |
ebabbf58 MD |
339 | return -EINVAL; |
340 | layout = &counter->percpu_counters[cpu]; | |
341 | break; | |
342 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: | |
343 | if (cpu >= 0) { | |
74cc1f59 | 344 | if (cpu >= num_possible_cpus()) |
ebabbf58 MD |
345 | return -EINVAL; |
346 | layout = &counter->percpu_counters[cpu]; | |
347 | } else { | |
348 | layout = &counter->global_counters; | |
349 | } | |
350 | break; | |
351 | case COUNTER_ALLOC_GLOBAL: | |
352 | if (cpu >= 0) | |
353 | return -EINVAL; | |
354 | layout = &counter->global_counters; | |
355 | break; | |
356 | default: | |
357 | return -EINVAL; | |
358 | } | |
359 | if (caa_unlikely(!layout->counters)) | |
360 | return -ENODEV; | |
361 | ||
362 | switch (config->counter_size) { | |
363 | case COUNTER_SIZE_8_BIT: | |
364 | { | |
365 | int8_t *int_p = (int8_t *) layout->counters + index; | |
366 | *value = (int64_t) CMM_LOAD_SHARED(*int_p); | |
367 | break; | |
368 | } | |
369 | case COUNTER_SIZE_16_BIT: | |
370 | { | |
371 | int16_t *int_p = (int16_t *) layout->counters + index; | |
372 | *value = (int64_t) CMM_LOAD_SHARED(*int_p); | |
373 | break; | |
374 | } | |
375 | case COUNTER_SIZE_32_BIT: | |
376 | { | |
377 | int32_t *int_p = (int32_t *) layout->counters + index; | |
378 | *value = (int64_t) CMM_LOAD_SHARED(*int_p); | |
379 | break; | |
380 | } | |
381 | #if CAA_BITS_PER_LONG == 64 | |
382 | case COUNTER_SIZE_64_BIT: | |
383 | { | |
384 | int64_t *int_p = (int64_t *) layout->counters + index; | |
385 | *value = CMM_LOAD_SHARED(*int_p); | |
386 | break; | |
387 | } | |
388 | #endif | |
389 | default: | |
390 | return -EINVAL; | |
391 | } | |
392 | *overflow = lttng_bitmap_test_bit(index, layout->overflow_bitmap); | |
393 | *underflow = lttng_bitmap_test_bit(index, layout->underflow_bitmap); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | int lttng_counter_aggregate(const struct lib_counter_config *config, | |
398 | struct lib_counter *counter, | |
399 | const size_t *dimension_indexes, | |
400 | int64_t *value, bool *overflow, | |
401 | bool *underflow) | |
402 | { | |
403 | int cpu, ret; | |
404 | int64_t v, sum = 0; | |
405 | bool of, uf; | |
406 | ||
407 | *overflow = false; | |
408 | *underflow = false; | |
409 | ||
410 | switch (config->alloc) { | |
411 | case COUNTER_ALLOC_GLOBAL: /* Fallthrough */ | |
412 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: | |
413 | /* Read global counter. */ | |
414 | ret = lttng_counter_read(config, counter, dimension_indexes, | |
415 | -1, &v, &of, &uf); | |
416 | if (ret < 0) | |
417 | return ret; | |
418 | sum += v; | |
419 | *overflow |= of; | |
420 | *underflow |= uf; | |
421 | break; | |
422 | case COUNTER_ALLOC_PER_CPU: | |
423 | break; | |
424 | default: | |
425 | return -EINVAL; | |
426 | } | |
427 | ||
428 | switch (config->alloc) { | |
429 | case COUNTER_ALLOC_GLOBAL: | |
430 | break; | |
431 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: /* Fallthrough */ | |
432 | case COUNTER_ALLOC_PER_CPU: | |
74cc1f59 | 433 | for_each_possible_cpu(cpu) { |
ebabbf58 MD |
434 | int64_t old = sum; |
435 | ||
436 | ret = lttng_counter_read(config, counter, dimension_indexes, | |
437 | cpu, &v, &of, &uf); | |
438 | if (ret < 0) | |
439 | return ret; | |
440 | *overflow |= of; | |
441 | *underflow |= uf; | |
442 | /* Overflow is defined on unsigned types. */ | |
443 | sum = (int64_t) ((uint64_t) old + (uint64_t) v); | |
444 | if (v > 0 && sum < old) | |
445 | *overflow = true; | |
446 | else if (v < 0 && sum > old) | |
447 | *underflow = true; | |
448 | } | |
449 | break; | |
450 | default: | |
451 | return -EINVAL; | |
452 | } | |
453 | *value = sum; | |
454 | return 0; | |
455 | } | |
456 | ||
457 | static | |
458 | int lttng_counter_clear_cpu(const struct lib_counter_config *config, | |
459 | struct lib_counter *counter, | |
460 | const size_t *dimension_indexes, | |
461 | int cpu) | |
462 | { | |
463 | size_t index; | |
464 | struct lib_counter_layout *layout; | |
465 | ||
466 | if (caa_unlikely(lttng_counter_validate_indexes(config, counter, dimension_indexes))) | |
467 | return -EOVERFLOW; | |
468 | index = lttng_counter_get_index(config, counter, dimension_indexes); | |
469 | ||
470 | switch (config->alloc) { | |
471 | case COUNTER_ALLOC_PER_CPU: | |
74cc1f59 | 472 | if (cpu < 0 || cpu >= num_possible_cpus()) |
ebabbf58 MD |
473 | return -EINVAL; |
474 | layout = &counter->percpu_counters[cpu]; | |
475 | break; | |
476 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: | |
477 | if (cpu >= 0) { | |
74cc1f59 | 478 | if (cpu >= num_possible_cpus()) |
ebabbf58 MD |
479 | return -EINVAL; |
480 | layout = &counter->percpu_counters[cpu]; | |
481 | } else { | |
482 | layout = &counter->global_counters; | |
483 | } | |
484 | break; | |
485 | case COUNTER_ALLOC_GLOBAL: | |
486 | if (cpu >= 0) | |
487 | return -EINVAL; | |
488 | layout = &counter->global_counters; | |
489 | break; | |
490 | default: | |
491 | return -EINVAL; | |
492 | } | |
493 | if (caa_unlikely(!layout->counters)) | |
494 | return -ENODEV; | |
495 | ||
496 | switch (config->counter_size) { | |
497 | case COUNTER_SIZE_8_BIT: | |
498 | { | |
499 | int8_t *int_p = (int8_t *) layout->counters + index; | |
500 | CMM_STORE_SHARED(*int_p, 0); | |
501 | break; | |
502 | } | |
503 | case COUNTER_SIZE_16_BIT: | |
504 | { | |
505 | int16_t *int_p = (int16_t *) layout->counters + index; | |
506 | CMM_STORE_SHARED(*int_p, 0); | |
507 | break; | |
508 | } | |
509 | case COUNTER_SIZE_32_BIT: | |
510 | { | |
511 | int32_t *int_p = (int32_t *) layout->counters + index; | |
512 | CMM_STORE_SHARED(*int_p, 0); | |
513 | break; | |
514 | } | |
515 | #if CAA_BITS_PER_LONG == 64 | |
516 | case COUNTER_SIZE_64_BIT: | |
517 | { | |
518 | int64_t *int_p = (int64_t *) layout->counters + index; | |
519 | CMM_STORE_SHARED(*int_p, 0); | |
520 | break; | |
521 | } | |
522 | #endif | |
523 | default: | |
524 | return -EINVAL; | |
525 | } | |
526 | lttng_bitmap_clear_bit(index, layout->overflow_bitmap); | |
527 | lttng_bitmap_clear_bit(index, layout->underflow_bitmap); | |
528 | return 0; | |
529 | } | |
530 | ||
531 | int lttng_counter_clear(const struct lib_counter_config *config, | |
532 | struct lib_counter *counter, | |
533 | const size_t *dimension_indexes) | |
534 | { | |
535 | int cpu, ret; | |
536 | ||
537 | switch (config->alloc) { | |
538 | case COUNTER_ALLOC_PER_CPU: | |
539 | break; | |
540 | case COUNTER_ALLOC_GLOBAL: /* Fallthrough */ | |
541 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: | |
542 | /* Clear global counter. */ | |
543 | ret = lttng_counter_clear_cpu(config, counter, dimension_indexes, -1); | |
544 | if (ret < 0) | |
545 | return ret; | |
546 | break; | |
547 | default: | |
548 | return -EINVAL; | |
549 | } | |
550 | ||
551 | switch (config->alloc) { | |
552 | case COUNTER_ALLOC_PER_CPU: /* Fallthrough */ | |
553 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: | |
74cc1f59 | 554 | for_each_possible_cpu(cpu) { |
ebabbf58 MD |
555 | ret = lttng_counter_clear_cpu(config, counter, dimension_indexes, cpu); |
556 | if (ret < 0) | |
557 | return ret; | |
558 | } | |
559 | break; | |
560 | case COUNTER_ALLOC_GLOBAL: | |
561 | break; | |
562 | default: | |
563 | return -EINVAL; | |
564 | } | |
565 | return 0; | |
566 | } |