include/lttng/lttng-cpuhotplug.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   2  *
   3  * lttng-cpuhotplug.h
   4  *
   5  * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  */
   7
   8 #ifndef LTTNG_CPUHOTPLUG_H
   9 #define LTTNG_CPUHOTPLUG_H
  10
  11 struct lttng_cpuhp_node;
  12
  13 #include <linux/cpuhotplug.h>
  14
  15 enum lttng_cpuhp_component {
  16         LTTNG_RING_BUFFER_FRONTEND,
  17         LTTNG_RING_BUFFER_BACKEND,
  18         LTTNG_RING_BUFFER_ITER,
  19         LTTNG_CONTEXT_PERF_COUNTERS,
  20 };
  21
  22 struct lttng_cpuhp_node {
  23         enum lttng_cpuhp_component component;
  24         struct hlist_node node;
  25 };
  26
  27 extern enum cpuhp_state lttng_hp_prepare;
  28 extern enum cpuhp_state lttng_hp_online;
  29
  30 int lttng_cpuhp_rb_backend_prepare(unsigned int cpu,
  31                 struct lttng_cpuhp_node *node);
  32 int lttng_cpuhp_rb_frontend_dead(unsigned int cpu,
  33                 struct lttng_cpuhp_node *node);
  34 int lttng_cpuhp_rb_frontend_online(unsigned int cpu,
  35                 struct lttng_cpuhp_node *node);
  36 int lttng_cpuhp_rb_frontend_offline(unsigned int cpu,
  37                 struct lttng_cpuhp_node *node);
  38 int lttng_cpuhp_rb_iter_online(unsigned int cpu,
  39                 struct lttng_cpuhp_node *node);
  40
  41 /* Ring buffer is a separate library. */
  42 void lttng_rb_set_hp_prepare(enum cpuhp_state val);
  43 void lttng_rb_set_hp_online(enum cpuhp_state val);
  44
  45 extern enum cpuhp_state lttng_rb_hp_prepare;
  46 extern enum cpuhp_state lttng_rb_hp_online;
  47
  48 #endif /* LTTNG_CPUHOTPLUG_H */