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 "kernelcompat.h"
  14 #include "tracercore.h"
  15
  16 /* Traces structures */
  17 struct ltt_traces ltt_traces = {
  18         .setup_head = LIST_HEAD_INIT(ltt_traces.setup_head),
  19         .head = LIST_HEAD_INIT(ltt_traces.head),
  20 };
  21 //ust// EXPORT_SYMBOL(ltt_traces);
  22
  23 /* Traces list writer locking */
  24 static DEFINE_MUTEX(ltt_traces_mutex);
  25
  26 /* dentry of ltt's root dir */
  27 //ust// static struct dentry *ltt_root_dentry;
  28 //ust// struct dentry *get_ltt_root(void)
  29 //ust// {
  30 //ust//         if (!ltt_root_dentry) {
  31 //ust//         ltt_root_dentry = debugfs_create_dir(LTT_ROOT, NULL);
  32 //ust//                 if (!ltt_root_dentry)
  33 //ust//                         printk(KERN_ERR "LTT : create ltt root dir failed\n");
  34 //ust//         }
  35 //ust//         return ltt_root_dentry;
  36 //ust// }
  37 //ust// EXPORT_SYMBOL_GPL(get_ltt_root);
  38
  39 void ltt_lock_traces(void)
  40 {
  41         mutex_lock(&ltt_traces_mutex);
  42 }
  43 //ust// EXPORT_SYMBOL_GPL(ltt_lock_traces);
  44
  45 void ltt_unlock_traces(void)
  46 {
  47         mutex_unlock(&ltt_traces_mutex);
  48 }
  49 //ust// EXPORT_SYMBOL_GPL(ltt_unlock_traces);
  50
  51 //ust// DEFINE_PER_CPU(unsigned int, ltt_nesting);
  52 //ust// EXPORT_PER_CPU_SYMBOL(ltt_nesting);
  53 unsigned int ltt_nesting;
  54
  55 int ltt_run_filter_default(void *trace, uint16_t eID)
  56 {
  57         return 1;
  58 }
  59
  60 /* This function pointer is protected by a trace activation check */
  61 ltt_run_filter_functor ltt_run_filter = ltt_run_filter_default;
  62 //ust// EXPORT_SYMBOL_GPL(ltt_run_filter);
  63
  64 void ltt_filter_register(ltt_run_filter_functor func)
  65 {
  66         ltt_run_filter = func;
  67 }
  68 //ust// EXPORT_SYMBOL_GPL(ltt_filter_register);
  69
  70 void ltt_filter_unregister(void)
  71 {
  72         ltt_run_filter = ltt_run_filter_default;
  73 }
  74 //ust// EXPORT_SYMBOL_GPL(ltt_filter_unregister);