webprobe/webprobe.c

   1 /**
   2  * webprobe/webprobe.c
   3  * @author Ruslan Soloviev
   4  *
   5  * @section LICENSE
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  *
  20  * @section COPYRIGHT
  21  *
  22  * Copyright (C) Samsung Electronics, 2014
  23  *
  24  * @section DESCRIPTION
  25  *
  26  * Web application profiling
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/slab.h>
  31 #include <us_manager/us_manager.h>
  32 #include <us_manager/pf/pf_group.h>
  33 #include <us_manager/probes/probe_info_new.h>
  34 #include <uprobe/swap_uprobes.h>
  35 #include <parser/msg_cmd.h>
  36 #include <master/swap_initializer.h>
  37
  38 #include "webprobe.h"
  39 #include "webprobe_debugfs.h"
  40 #include "web_msg.h"
  41
  42 struct web_prof_data {
  43         struct dentry *app_dentry;
  44         struct dentry *lib_dentry;
  45         struct pf_group *pfg;
  46         u64 inspserver_addr;
  47         u64 tick_addr;
  48         bool enable;
  49 };
  50
  51 static DEFINE_MUTEX(web_mutex);
  52 static const char *CHROMIUM_EWK = "/usr/lib/libchromium-ewk.so";
  53 static struct web_prof_data *web_data;
  54
  55 /* function tick handler */
  56 static int tick_handler(struct uprobe *p, struct pt_regs *regs);
  57 static struct probe_desc pin_tick_handler = MAKE_UPROBE(tick_handler);
  58 static struct probe_new tick_probe = {
  59         .desc = &pin_tick_handler
  60 };
  61
  62 /* function inspector port */
  63 static int insport_rhandler(struct uretprobe_instance *ri,
  64                             struct pt_regs *regs);
  65 static struct probe_desc pin_insport_rhandler =
  66                                 MAKE_URPROBE(NULL, insport_rhandler, 0);
  67 static struct probe_new insport_probe = {
  68         .desc = &pin_insport_rhandler
  69 };
  70
  71 static int insport_rhandler(struct uretprobe_instance *ri,
  72                             struct pt_regs *regs)
  73 {
  74         set_wrt_launcher_port((int)regs_return_value(regs));
  75
  76         return 0;
  77 }
  78
  79 static int tick_handler(struct uprobe *p, struct pt_regs *regs)
  80 {
  81         web_sample_msg(regs);
  82
  83         return 0;
  84 }
  85
  86 u64 *web_prof_addr_ptr(enum web_prof_addr_t type)
  87 {
  88         u64 *addr_ptr;
  89
  90         mutex_lock(&web_mutex);
  91         switch (type) {
  92         case INSPSERVER_START:
  93                 addr_ptr = &web_data->inspserver_addr;
  94                 break;
  95         case TICK_PROBE:
  96                 addr_ptr = &web_data->tick_addr;
  97                 break;
  98         default:
  99                 pr_err("ERROR: WEB_PROF_ADDR_PTR_TYPE=0x%x\n", type);
 100                 addr_ptr = NULL;
 101         }
 102         mutex_unlock(&web_mutex);
 103
 104         return addr_ptr;
 105 }
 106
 107 int web_prof_data_set(char *app_path, char *app_id)
 108 {
 109         int ret = 0;
 110
 111         mutex_lock(&web_mutex);
 112         web_data->app_dentry = dentry_by_path(app_path);
 113         if (!web_data->app_dentry) {
 114                 ret = -EFAULT;
 115                 goto out;
 116         }
 117
 118         web_data->lib_dentry = dentry_by_path(CHROMIUM_EWK);
 119         if (!web_data->lib_dentry) {
 120                 ret = -EFAULT;
 121                 goto out;
 122         }
 123
 124         if (web_data->pfg)
 125                 put_pf_group(web_data->pfg);
 126
 127         web_data->pfg = get_pf_group_by_comm(app_id, web_data->app_dentry);
 128         if (!web_data->pfg) {
 129                 ret = -EFAULT;
 130                 goto out;
 131         }
 132
 133 out:
 134         mutex_unlock(&web_mutex);
 135
 136         return 0;
 137 }
 138
 139 bool web_prof_enabled(void)
 140 {
 141         bool ret;
 142
 143         mutex_lock(&web_mutex);
 144         ret = web_data->enable;
 145         mutex_unlock(&web_mutex);
 146
 147         return ret;
 148 }
 149
 150 static void __web_prof_disable(struct web_prof_data *data)
 151 {
 152         pin_unregister(&tick_probe, data->pfg, data->lib_dentry);
 153         pin_unregister(&insport_probe, data->pfg, data->lib_dentry);
 154 }
 155
 156 static int __web_prof_enable(struct web_prof_data *data)
 157 {
 158         int ret;
 159
 160         tick_probe.offset = data->tick_addr;
 161         ret = pin_register(&tick_probe, data->pfg, data->lib_dentry);
 162         if (ret)
 163                 goto fail0;
 164
 165         insport_probe.offset = data->inspserver_addr;
 166         ret = pin_register(&insport_probe, data->pfg, data->lib_dentry);
 167         if (ret)
 168                 goto fail1;
 169
 170         return 0;
 171
 172 fail1:
 173         pin_unregister(&tick_probe, data->pfg, data->lib_dentry);
 174 fail0:
 175         return ret;
 176 }
 177
 178 int web_prof_enable(void)
 179 {
 180         int ret = 0;
 181
 182         mutex_lock(&web_mutex);
 183         if (web_data->enable) {
 184                 pr_err("ERROR: Web profiling is already enabled\n");
 185                 ret = -EBUSY;
 186                 goto out;
 187         }
 188
 189         if (!web_data->inspserver_addr) {
 190                 pr_err("bad inspserver addr 0x%llx\n",
 191                        web_data->inspserver_addr);
 192                 goto out;
 193         }
 194
 195         if (!web_data->tick_addr) {
 196                 pr_err("bad tick addr 0x%llx\n", web_data->tick_addr);
 197                 goto out;
 198         }
 199
 200         ret = __web_prof_enable(web_data);
 201         if (ret) {
 202                 pr_err("failed to enable Web profiling\n");
 203                 goto out;
 204         }
 205
 206         web_data->enable = true;
 207
 208 out:
 209         mutex_unlock(&web_mutex);
 210
 211         return ret;
 212 }
 213
 214 int web_prof_disable(void)
 215 {
 216         int ret = 0;
 217
 218         mutex_lock(&web_mutex);
 219         if (!web_data->enable) {
 220                 pr_err("ERROR: Web profiling is already disabled\n");
 221                 ret = -EBUSY;
 222                 goto out;
 223         }
 224
 225         __web_prof_disable(web_data);
 226         web_data->enable = false;
 227
 228 out:
 229         mutex_unlock(&web_mutex);
 230         return ret;
 231 }
 232
 233 static int webprobe_module_init(void)
 234 {
 235         mutex_lock(&web_mutex);
 236         web_data = kzalloc(sizeof(*web_data), GFP_KERNEL);
 237         if (!web_data)
 238                 return -ENOMEM;
 239
 240         web_data->enable = false;
 241         mutex_unlock(&web_mutex);
 242
 243         return 0;
 244 }
 245
 246 static void webprobe_module_exit(void)
 247 {
 248         mutex_lock(&web_mutex);
 249         if (web_data->enable)
 250                 __web_prof_disable(web_data);
 251
 252         if (web_data->pfg)
 253                 put_pf_group(web_data->pfg);
 254
 255         kfree(web_data);
 256         web_data = NULL;
 257         mutex_unlock(&web_mutex);
 258 }
 259
 260 SWAP_LIGHT_INIT_MODULE(NULL, webprobe_module_init, webprobe_module_exit,
 261                        webprobe_debugfs_init, webprobe_debugfs_exit);
 262
 263 MODULE_LICENSE("GPL");
 264 MODULE_DESCRIPTION("SWAP webprobe");
 265 MODULE_AUTHOR("Ruslan Soloviev <r.soloviev@samsung.com>"
 266               "Anastasia Lyupa <a.lyupa@samsung.com>");