libust/tracercore.c

   1 /*
   2  * LTT core in-kernel infrastructure.
   3  *
   4  * Copyright 2006 - Mathieu Desnoyers mathieu.desnoyers@polymtl.ca
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 //ust// #include <linux/ltt-core.h>
  22 //ust// #include <linux/percpu.h>
  23 //ust// #include <linux/module.h>
  24 //ust// #include <linux/debugfs.h>
  25 #include <ust/kernelcompat.h>
  26 #include "tracercore.h"
  27
  28 /* Traces structures */
  29 struct ltt_traces ltt_traces = {
  30         .setup_head = LIST_HEAD_INIT(ltt_traces.setup_head),
  31         .head = LIST_HEAD_INIT(ltt_traces.head),
  32 };
  33 //ust// EXPORT_SYMBOL(ltt_traces);
  34
  35 /* Traces list writer locking */
  36 static DEFINE_MUTEX(ltt_traces_mutex);
  37
  38 /* dentry of ltt's root dir */
  39 //ust// static struct dentry *ltt_root_dentry;
  40 //ust// struct dentry *get_ltt_root(void)
  41 //ust// {
  42 //ust//         if (!ltt_root_dentry) {
  43 //ust//         ltt_root_dentry = debugfs_create_dir(LTT_ROOT, NULL);
  44 //ust//                 if (!ltt_root_dentry)
  45 //ust//                         printk(KERN_ERR "LTT : create ltt root dir failed\n");
  46 //ust//         }
  47 //ust//         return ltt_root_dentry;
  48 //ust// }
  49 //ust// EXPORT_SYMBOL_GPL(get_ltt_root);
  50
  51 void ltt_lock_traces(void)
  52 {
  53         mutex_lock(&ltt_traces_mutex);
  54 }
  55 //ust// EXPORT_SYMBOL_GPL(ltt_lock_traces);
  56
  57 void ltt_unlock_traces(void)
  58 {
  59         mutex_unlock(&ltt_traces_mutex);
  60 }
  61 //ust// EXPORT_SYMBOL_GPL(ltt_unlock_traces);
  62
  63 //ust// DEFINE_PER_CPU(unsigned int, ltt_nesting);
  64 //ust// EXPORT_PER_CPU_SYMBOL(ltt_nesting);
  65 unsigned int ltt_nesting;
  66
  67 int ltt_run_filter_default(void *trace, uint16_t eID)
  68 {
  69         return 1;
  70 }
  71
  72 /* This function pointer is protected by a trace activation check */
  73 ltt_run_filter_functor ltt_run_filter = ltt_run_filter_default;
  74 //ust// EXPORT_SYMBOL_GPL(ltt_run_filter);
  75
  76 void ltt_filter_register(ltt_run_filter_functor func)
  77 {
  78         ltt_run_filter = func;
  79 }
  80 //ust// EXPORT_SYMBOL_GPL(ltt_filter_register);
  81
  82 void ltt_filter_unregister(void)
  83 {
  84         ltt_run_filter = ltt_run_filter_default;
  85 }
  86 //ust// EXPORT_SYMBOL_GPL(ltt_filter_unregister);