libtracing/tracercore.c

   1 /*
   2  * LTT core in-kernel infrastructure.
   3  *
   4  * Copyright 2006 - Mathieu Desnoyers mathieu.desnoyers@polymtl.ca
   5  *
   6  * Distributed under the GPL license
   7  */
   8
   9 //ust// #include <linux/ltt-core.h>
  10 //ust// #include <linux/percpu.h>
  11 //ust// #include <linux/module.h>
  12 //ust// #include <linux/debugfs.h>
  13 #include "tracercore.h"
  14
  15 /* Traces structures */
  16 struct ltt_traces ltt_traces = {
  17         .setup_head = LIST_HEAD_INIT(ltt_traces.setup_head),
  18         .head = LIST_HEAD_INIT(ltt_traces.head),
  19 };
  20 //ust// EXPORT_SYMBOL(ltt_traces);
  21
  22 /* Traces list writer locking */
  23 static DEFINE_MUTEX(ltt_traces_mutex);
  24
  25 /* dentry of ltt's root dir */
  26 //ust// static struct dentry *ltt_root_dentry;
  27 //ust// struct dentry *get_ltt_root(void)
  28 //ust// {
  29 //ust//         if (!ltt_root_dentry) {
  30 //ust//         ltt_root_dentry = debugfs_create_dir(LTT_ROOT, NULL);
  31 //ust//                 if (!ltt_root_dentry)
  32 //ust//                         printk(KERN_ERR "LTT : create ltt root dir failed\n");
  33 //ust//         }
  34 //ust//         return ltt_root_dentry;
  35 //ust// }
  36 //ust// EXPORT_SYMBOL_GPL(get_ltt_root);
  37
  38 void ltt_lock_traces(void)
  39 {
  40         mutex_lock(&ltt_traces_mutex);
  41 }
  42 //ust// EXPORT_SYMBOL_GPL(ltt_lock_traces);
  43
  44 void ltt_unlock_traces(void)
  45 {
  46         mutex_unlock(&ltt_traces_mutex);
  47 }
  48 //ust// EXPORT_SYMBOL_GPL(ltt_unlock_traces);
  49
  50 //ust// DEFINE_PER_CPU(unsigned int, ltt_nesting);
  51 //ust// EXPORT_PER_CPU_SYMBOL(ltt_nesting);
  52 unsigned int ltt_nesting;
  53
  54 int ltt_run_filter_default(void *trace, uint16_t eID)
  55 {
  56         return 1;
  57 }
  58
  59 /* This function pointer is protected by a trace activation check */
  60 ltt_run_filter_functor ltt_run_filter = ltt_run_filter_default;
  61 //ust// EXPORT_SYMBOL_GPL(ltt_run_filter);
  62
  63 void ltt_filter_register(ltt_run_filter_functor func)
  64 {
  65         ltt_run_filter = func;
  66 }
  67 //ust// EXPORT_SYMBOL_GPL(ltt_filter_register);
  68
  69 void ltt_filter_unregister(void)
  70 {
  71         ltt_run_filter = ltt_run_filter_default;
  72 }
  73 //ust// EXPORT_SYMBOL_GPL(ltt_filter_unregister);