libcounter/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(const struct lib_counter_config *config,
  18                                                  struct lib_counter *counter,
  19                                                  const size_t *dimension_indexes)
  20 {
  21         size_t nr_dimensions = counter->nr_dimensions, i;
  22
  23         for (i = 0; i < nr_dimensions; i++) {
  24                 if (caa_unlikely(dimension_indexes[i] >= counter->dimensions[i].max_nr_elem))
  25                         return -EOVERFLOW;
  26         }
  27         return 0;
  28 }
  29
  30
  31 static inline size_t lttng_counter_get_index(const struct lib_counter_config *config,
  32                                              struct lib_counter *counter,
  33                                              const size_t *dimension_indexes)
  34 {
  35         size_t nr_dimensions = counter->nr_dimensions, i;
  36         size_t index = 0;
  37
  38         for (i = 0; i < nr_dimensions; i++) {
  39                 struct lib_counter_dimension *dimension = &counter->dimensions[i];
  40                 const size_t *dimension_index = &dimension_indexes[i];
  41
  42                 index += *dimension_index * dimension->stride;
  43         }
  44         return index;
  45 }
  46
  47 #endif /* _LTTNG_COUNTER_INTERNAL_H */