include/counter/counter-internal.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * counter/counter-internal.h
   4  *
   5  * LTTng Counters Internal Header
   6  *
   7  * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  */
   9
  10 #ifndef _LTTNG_COUNTER_INTERNAL_H
  11 #define _LTTNG_COUNTER_INTERNAL_H
  12
  13 #include <linux/types.h>
  14 #include <linux/percpu.h>
  15 #include <counter/counter-types.h>
  16 #include <counter/config.h>
  17
  18 static inline int lttng_counter_validate_indexes(const struct lib_counter_config *config,
  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 (unlikely(dimension_indexes[i] >= counter->dimensions[i].max_nr_elem))
  26                         return -EOVERFLOW;
  27         }
  28         return 0;
  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 */