lttng-cpuhotplug.h

   1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
   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 #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0))
  14
  15 #include <linux/cpuhotplug.h>
  16
  17 enum lttng_cpuhp_component {
  18         LTTNG_RING_BUFFER_FRONTEND,
  19         LTTNG_RING_BUFFER_BACKEND,
  20         LTTNG_RING_BUFFER_ITER,
  21         LTTNG_CONTEXT_PERF_COUNTERS,
  22 };
  23
  24 struct lttng_cpuhp_node {
  25         enum lttng_cpuhp_component component;
  26         struct hlist_node node;
  27 };
  28
  29 extern enum cpuhp_state lttng_hp_prepare;
  30 extern enum cpuhp_state lttng_hp_online;
  31
  32 int lttng_cpuhp_rb_backend_prepare(unsigned int cpu,
  33                 struct lttng_cpuhp_node *node);
  34 int lttng_cpuhp_rb_frontend_dead(unsigned int cpu,
  35                 struct lttng_cpuhp_node *node);
  36 int lttng_cpuhp_rb_frontend_online(unsigned int cpu,
  37                 struct lttng_cpuhp_node *node);
  38 int lttng_cpuhp_rb_frontend_offline(unsigned int cpu,
  39                 struct lttng_cpuhp_node *node);
  40 int lttng_cpuhp_rb_iter_online(unsigned int cpu,
  41                 struct lttng_cpuhp_node *node);
  42
  43 /* Ring buffer is a separate library. */
  44 void lttng_rb_set_hp_prepare(enum cpuhp_state val);
  45 void lttng_rb_set_hp_online(enum cpuhp_state val);
  46
  47 extern enum cpuhp_state lttng_rb_hp_prepare;
  48 extern enum cpuhp_state lttng_rb_hp_online;
  49
  50 #endif
  51
  52 #endif /* LTTNG_CPUHOTPLUG_H */