src/common/counter/counter-internal.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * LTTng Counters Internal Header
   7  */
   8
   9 #ifndef _LTTNG_COUNTER_INTERNAL_H
  10 #define _LTTNG_COUNTER_INTERNAL_H
  11
  12 #include <stdint.h>
  13 #include <lttng/ust-config.h>
  14 #include <urcu/compiler.h>
  15 #include "counter-types.h"
  16
  17 static inline int lttng_counter_validate_indexes(
  18                 const struct lib_counter_config *config __attribute__((unused)),
  19                 struct lib_counter *counter,
  20                 const size_t *dimension_indexes)
  21 {
  22         size_t nr_dimensions = counter->nr_dimensions, i;
  23
  24         for (i = 0; i < nr_dimensions; i++) {
  25                 if (caa_unlikely(dimension_indexes[i] >= counter->dimensions[i].max_nr_elem))
  26                         return -EOVERFLOW;
  27         }
  28         return 0;
  29 }
  30
  31
  32 static inline size_t lttng_counter_get_index(
  33                 const struct lib_counter_config *config __attribute__((unused)),
  34                 struct lib_counter *counter,
  35                 const size_t *dimension_indexes)
  36 {
  37         size_t nr_dimensions = counter->nr_dimensions, i;
  38         size_t index = 0;
  39
  40         for (i = 0; i < nr_dimensions; i++) {
  41                 struct lib_counter_dimension *dimension = &counter->dimensions[i];
  42                 const size_t *dimension_index = &dimension_indexes[i];
  43
  44                 index += *dimension_index * dimension->stride;
  45         }
  46         return index;
  47 }
  48
  49 #endif /* _LTTNG_COUNTER_INTERNAL_H */