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 <errno.h>
  14
  15 #include <lttng/ust-config.h>
  16 #include <urcu/compiler.h>
  17 #include "counter-types.h"
  18
  19 static inline int lttng_counter_validate_indexes(
  20                 const struct lib_counter_config *config __attribute__((unused)),
  21                 struct lib_counter *counter,
  22                 const size_t *dimension_indexes)
  23 {
  24         size_t nr_dimensions = counter->nr_dimensions, i;
  25
  26         for (i = 0; i < nr_dimensions; i++) {
  27                 if (caa_unlikely(dimension_indexes[i] >= counter->dimensions[i].max_nr_elem))
  28                         return -EOVERFLOW;
  29         }
  30         return 0;
  31 }
  32
  33
  34 static inline size_t lttng_counter_get_index(
  35                 const struct lib_counter_config *config __attribute__((unused)),
  36                 struct lib_counter *counter,
  37                 const size_t *dimension_indexes)
  38 {
  39         size_t nr_dimensions = counter->nr_dimensions, i;
  40         size_t index = 0;
  41
  42         for (i = 0; i < nr_dimensions; i++) {
  43                 struct lib_counter_dimension *dimension = &counter->dimensions[i];
  44                 const size_t *dimension_index = &dimension_indexes[i];
  45
  46                 index += *dimension_index * dimension->stride;
  47         }
  48         return index;
  49 }
  50
  51 #endif /* _LTTNG_COUNTER_INTERNAL_H */