lttng-cpuhotplug.h

   1 #ifndef LTTNG_CPUHOTPLUG_H
   2 #define LTTNG_CPUHOTPLUG_H
   3
   4 /*
   5  * lttng-cpuhotplug.h
   6  *
   7  * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 struct lttng_cpuhp_node;
  25
  26 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
  27
  28 #include <linux/cpuhotplug.h>
  29
  30 enum lttng_cpuhp_component {
  31         LTTNG_RING_BUFFER_FRONTEND,
  32         LTTNG_RING_BUFFER_BACKEND,
  33         LTTNG_RING_BUFFER_ITER,
  34         LTTNG_CONTEXT_PERF_COUNTERS,
  35 };
  36
  37 struct lttng_cpuhp_node {
  38         enum lttng_cpuhp_component component;
  39         struct hlist_node node;
  40 };
  41
  42 extern enum cpuhp_state lttng_hp_prepare;
  43 extern enum cpuhp_state lttng_hp_online;
  44
  45 int lttng_cpuhp_rb_backend_prepare(unsigned int cpu,
  46                 struct lttng_cpuhp_node *node);
  47 int lttng_cpuhp_rb_frontend_dead(unsigned int cpu,
  48                 struct lttng_cpuhp_node *node);
  49 int lttng_cpuhp_rb_frontend_online(unsigned int cpu,
  50                 struct lttng_cpuhp_node *node);
  51 int lttng_cpuhp_rb_frontend_offline(unsigned int cpu,
  52                 struct lttng_cpuhp_node *node);
  53 int lttng_cpuhp_rb_iter_online(unsigned int cpu,
  54                 struct lttng_cpuhp_node *node);
  55
  56 /* Ring buffer is a separate library. */
  57 void lttng_rb_set_hp_prepare(enum cpuhp_state val);
  58 void lttng_rb_set_hp_online(enum cpuhp_state val);
  59
  60 extern enum cpuhp_state lttng_rb_hp_prepare;
  61 extern enum cpuhp_state lttng_rb_hp_online;
  62
  63 #endif
  64
  65 #endif /* LTTNG_CPUHOTPLUG_H */