Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1 | /* |
Masami Hiramatsu | 77b44d1 | 2009-11-03 19:12:47 -0500 | [diff] [blame] | 2 | * Kprobes-based tracing events |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 3 | * |
| 4 | * Created by Masami Hiramatsu <mhiramat@redhat.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/uaccess.h> |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 22 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 23 | #include "trace_probe.h" |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 24 | |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 25 | #define KPROBE_EVENT_SYSTEM "kprobes" |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 26 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 27 | /** |
Masami Hiramatsu | 77b44d1 | 2009-11-03 19:12:47 -0500 | [diff] [blame] | 28 | * Kprobe event core functions |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 29 | */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 30 | struct trace_probe { |
| 31 | struct list_head list; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 32 | struct kretprobe rp; /* Use rp.kp for kprobe use */ |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 33 | unsigned long nhit; |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 34 | unsigned int flags; /* For TP_FLAG_* */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 35 | const char *symbol; /* symbol name */ |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 36 | struct ftrace_event_class class; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 37 | struct ftrace_event_call call; |
Masami Hiramatsu | 3d1fc7b | 2013-05-13 20:58:37 +0900 | [diff] [blame] | 38 | struct ftrace_event_file * __rcu *files; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 39 | ssize_t size; /* trace entry size */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 40 | unsigned int nr_args; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 41 | struct probe_arg args[]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 42 | }; |
| 43 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 44 | #define SIZEOF_TRACE_PROBE(n) \ |
| 45 | (offsetof(struct trace_probe, args) + \ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 46 | (sizeof(struct probe_arg) * (n))) |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 47 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 48 | |
Masami Hiramatsu | db02038 | 2013-05-09 14:44:32 +0900 | [diff] [blame] | 49 | static __kprobes bool trace_probe_is_return(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 50 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 51 | return tp->rp.handler != NULL; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 52 | } |
| 53 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 54 | static __kprobes const char *trace_probe_symbol(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 55 | { |
| 56 | return tp->symbol ? tp->symbol : "unknown"; |
| 57 | } |
| 58 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 59 | static __kprobes unsigned long trace_probe_offset(struct trace_probe *tp) |
| 60 | { |
| 61 | return tp->rp.kp.offset; |
| 62 | } |
| 63 | |
| 64 | static __kprobes bool trace_probe_is_enabled(struct trace_probe *tp) |
| 65 | { |
| 66 | return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE)); |
| 67 | } |
| 68 | |
| 69 | static __kprobes bool trace_probe_is_registered(struct trace_probe *tp) |
| 70 | { |
| 71 | return !!(tp->flags & TP_FLAG_REGISTERED); |
| 72 | } |
| 73 | |
| 74 | static __kprobes bool trace_probe_has_gone(struct trace_probe *tp) |
| 75 | { |
| 76 | return !!(kprobe_gone(&tp->rp.kp)); |
| 77 | } |
| 78 | |
| 79 | static __kprobes bool trace_probe_within_module(struct trace_probe *tp, |
| 80 | struct module *mod) |
| 81 | { |
| 82 | int len = strlen(mod->name); |
| 83 | const char *name = trace_probe_symbol(tp); |
| 84 | return strncmp(mod->name, name, len) == 0 && name[len] == ':'; |
| 85 | } |
| 86 | |
| 87 | static __kprobes bool trace_probe_is_on_module(struct trace_probe *tp) |
| 88 | { |
| 89 | return !!strchr(trace_probe_symbol(tp), ':'); |
| 90 | } |
| 91 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 92 | static int register_probe_event(struct trace_probe *tp); |
| 93 | static void unregister_probe_event(struct trace_probe *tp); |
| 94 | |
| 95 | static DEFINE_MUTEX(probe_lock); |
| 96 | static LIST_HEAD(probe_list); |
| 97 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 98 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
| 99 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, |
| 100 | struct pt_regs *regs); |
| 101 | |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 102 | /* |
| 103 | * Allocate new trace_probe and initialize it (including kprobes). |
| 104 | */ |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 105 | static struct trace_probe *alloc_trace_probe(const char *group, |
| 106 | const char *event, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 107 | void *addr, |
| 108 | const char *symbol, |
| 109 | unsigned long offs, |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 110 | int nargs, bool is_return) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 111 | { |
| 112 | struct trace_probe *tp; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 113 | int ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 114 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 115 | tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 116 | if (!tp) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 117 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 118 | |
| 119 | if (symbol) { |
| 120 | tp->symbol = kstrdup(symbol, GFP_KERNEL); |
| 121 | if (!tp->symbol) |
| 122 | goto error; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 123 | tp->rp.kp.symbol_name = tp->symbol; |
| 124 | tp->rp.kp.offset = offs; |
| 125 | } else |
| 126 | tp->rp.kp.addr = addr; |
| 127 | |
| 128 | if (is_return) |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 129 | tp->rp.handler = kretprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 130 | else |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 131 | tp->rp.kp.pre_handler = kprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 132 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 133 | if (!event || !is_good_name(event)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 134 | ret = -EINVAL; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 135 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 136 | } |
| 137 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 138 | tp->call.class = &tp->class; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 139 | tp->call.name = kstrdup(event, GFP_KERNEL); |
| 140 | if (!tp->call.name) |
| 141 | goto error; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 142 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 143 | if (!group || !is_good_name(group)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 144 | ret = -EINVAL; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 145 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 146 | } |
| 147 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 148 | tp->class.system = kstrdup(group, GFP_KERNEL); |
| 149 | if (!tp->class.system) |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 150 | goto error; |
| 151 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 152 | INIT_LIST_HEAD(&tp->list); |
| 153 | return tp; |
| 154 | error: |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 155 | kfree(tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 156 | kfree(tp->symbol); |
| 157 | kfree(tp); |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 158 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | static void free_trace_probe(struct trace_probe *tp) |
| 162 | { |
| 163 | int i; |
| 164 | |
| 165 | for (i = 0; i < tp->nr_args; i++) |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 166 | traceprobe_free_probe_arg(&tp->args[i]); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 167 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 168 | kfree(tp->call.class->system); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 169 | kfree(tp->call.name); |
| 170 | kfree(tp->symbol); |
| 171 | kfree(tp); |
| 172 | } |
| 173 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 174 | static struct trace_probe *find_trace_probe(const char *event, |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 175 | const char *group) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 176 | { |
| 177 | struct trace_probe *tp; |
| 178 | |
| 179 | list_for_each_entry(tp, &probe_list, list) |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 180 | if (strcmp(tp->call.name, event) == 0 && |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 181 | strcmp(tp->call.class->system, group) == 0) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 182 | return tp; |
| 183 | return NULL; |
| 184 | } |
| 185 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 186 | static int trace_probe_nr_files(struct trace_probe *tp) |
| 187 | { |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 188 | struct ftrace_event_file **file; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 189 | int ret = 0; |
| 190 | |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 191 | /* |
| 192 | * Since all tp->files updater is protected by probe_enable_lock, |
| 193 | * we don't need to lock an rcu_read_lock. |
| 194 | */ |
| 195 | file = rcu_dereference_raw(tp->files); |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 196 | if (file) |
| 197 | while (*(file++)) |
| 198 | ret++; |
| 199 | |
| 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | static DEFINE_MUTEX(probe_enable_lock); |
| 204 | |
| 205 | /* |
| 206 | * Enable trace_probe |
| 207 | * if the file is NULL, enable "perf" handler, or enable "trace" handler. |
| 208 | */ |
| 209 | static int |
| 210 | enable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file) |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 211 | { |
| 212 | int ret = 0; |
| 213 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 214 | mutex_lock(&probe_enable_lock); |
| 215 | |
| 216 | if (file) { |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 217 | struct ftrace_event_file **new, **old; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 218 | int n = trace_probe_nr_files(tp); |
| 219 | |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 220 | old = rcu_dereference_raw(tp->files); |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 221 | /* 1 is for new one and 1 is for stopper */ |
| 222 | new = kzalloc((n + 2) * sizeof(struct ftrace_event_file *), |
| 223 | GFP_KERNEL); |
| 224 | if (!new) { |
| 225 | ret = -ENOMEM; |
| 226 | goto out_unlock; |
| 227 | } |
| 228 | memcpy(new, old, n * sizeof(struct ftrace_event_file *)); |
| 229 | new[n] = file; |
| 230 | /* The last one keeps a NULL */ |
| 231 | |
| 232 | rcu_assign_pointer(tp->files, new); |
| 233 | tp->flags |= TP_FLAG_TRACE; |
| 234 | |
| 235 | if (old) { |
| 236 | /* Make sure the probe is done with old files */ |
| 237 | synchronize_sched(); |
| 238 | kfree(old); |
| 239 | } |
| 240 | } else |
| 241 | tp->flags |= TP_FLAG_PROFILE; |
| 242 | |
zhangwei(Jovi) | 195a84d | 2013-06-14 10:10:38 +0800 | [diff] [blame] | 243 | if (trace_probe_is_registered(tp) && !trace_probe_has_gone(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 244 | if (trace_probe_is_return(tp)) |
| 245 | ret = enable_kretprobe(&tp->rp); |
| 246 | else |
| 247 | ret = enable_kprobe(&tp->rp.kp); |
| 248 | } |
| 249 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 250 | out_unlock: |
| 251 | mutex_unlock(&probe_enable_lock); |
| 252 | |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 253 | return ret; |
| 254 | } |
| 255 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 256 | static int |
| 257 | trace_probe_file_index(struct trace_probe *tp, struct ftrace_event_file *file) |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 258 | { |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 259 | struct ftrace_event_file **files; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 260 | int i; |
| 261 | |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 262 | /* |
| 263 | * Since all tp->files updater is protected by probe_enable_lock, |
| 264 | * we don't need to lock an rcu_read_lock. |
| 265 | */ |
| 266 | files = rcu_dereference_raw(tp->files); |
| 267 | if (files) { |
| 268 | for (i = 0; files[i]; i++) |
| 269 | if (files[i] == file) |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 270 | return i; |
| 271 | } |
| 272 | |
| 273 | return -1; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Disable trace_probe |
| 278 | * if the file is NULL, disable "perf" handler, or disable "trace" handler. |
| 279 | */ |
| 280 | static int |
| 281 | disable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file) |
| 282 | { |
| 283 | int ret = 0; |
| 284 | |
| 285 | mutex_lock(&probe_enable_lock); |
| 286 | |
| 287 | if (file) { |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 288 | struct ftrace_event_file **new, **old; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 289 | int n = trace_probe_nr_files(tp); |
| 290 | int i, j; |
| 291 | |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 292 | old = rcu_dereference_raw(tp->files); |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 293 | if (n == 0 || trace_probe_file_index(tp, file) < 0) { |
| 294 | ret = -EINVAL; |
| 295 | goto out_unlock; |
| 296 | } |
| 297 | |
| 298 | if (n == 1) { /* Remove the last file */ |
| 299 | tp->flags &= ~TP_FLAG_TRACE; |
| 300 | new = NULL; |
| 301 | } else { |
| 302 | new = kzalloc(n * sizeof(struct ftrace_event_file *), |
| 303 | GFP_KERNEL); |
| 304 | if (!new) { |
| 305 | ret = -ENOMEM; |
| 306 | goto out_unlock; |
| 307 | } |
| 308 | |
| 309 | /* This copy & check loop copies the NULL stopper too */ |
| 310 | for (i = 0, j = 0; j < n && i < n + 1; i++) |
| 311 | if (old[i] != file) |
| 312 | new[j++] = old[i]; |
| 313 | } |
| 314 | |
| 315 | rcu_assign_pointer(tp->files, new); |
| 316 | |
| 317 | /* Make sure the probe is done with old files */ |
| 318 | synchronize_sched(); |
| 319 | kfree(old); |
| 320 | } else |
| 321 | tp->flags &= ~TP_FLAG_PROFILE; |
| 322 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 323 | if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 324 | if (trace_probe_is_return(tp)) |
| 325 | disable_kretprobe(&tp->rp); |
| 326 | else |
| 327 | disable_kprobe(&tp->rp.kp); |
| 328 | } |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 329 | |
| 330 | out_unlock: |
| 331 | mutex_unlock(&probe_enable_lock); |
| 332 | |
| 333 | return ret; |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 334 | } |
| 335 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 336 | /* Internal register function - just handle k*probes and flags */ |
| 337 | static int __register_trace_probe(struct trace_probe *tp) |
| 338 | { |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 339 | int i, ret; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 340 | |
| 341 | if (trace_probe_is_registered(tp)) |
| 342 | return -EINVAL; |
| 343 | |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 344 | for (i = 0; i < tp->nr_args; i++) |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 345 | traceprobe_update_arg(&tp->args[i]); |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 346 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 347 | /* Set/clear disabled flag according to tp->flag */ |
| 348 | if (trace_probe_is_enabled(tp)) |
| 349 | tp->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; |
| 350 | else |
| 351 | tp->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
| 352 | |
| 353 | if (trace_probe_is_return(tp)) |
| 354 | ret = register_kretprobe(&tp->rp); |
| 355 | else |
| 356 | ret = register_kprobe(&tp->rp.kp); |
| 357 | |
| 358 | if (ret == 0) |
| 359 | tp->flags |= TP_FLAG_REGISTERED; |
| 360 | else { |
| 361 | pr_warning("Could not insert probe at %s+%lu: %d\n", |
| 362 | trace_probe_symbol(tp), trace_probe_offset(tp), ret); |
| 363 | if (ret == -ENOENT && trace_probe_is_on_module(tp)) { |
| 364 | pr_warning("This probe might be able to register after" |
| 365 | "target module is loaded. Continue.\n"); |
| 366 | ret = 0; |
| 367 | } else if (ret == -EILSEQ) { |
| 368 | pr_warning("Probing address(0x%p) is not an " |
| 369 | "instruction boundary.\n", |
| 370 | tp->rp.kp.addr); |
| 371 | ret = -EINVAL; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | return ret; |
| 376 | } |
| 377 | |
| 378 | /* Internal unregister function - just handle k*probes and flags */ |
| 379 | static void __unregister_trace_probe(struct trace_probe *tp) |
| 380 | { |
| 381 | if (trace_probe_is_registered(tp)) { |
| 382 | if (trace_probe_is_return(tp)) |
| 383 | unregister_kretprobe(&tp->rp); |
| 384 | else |
| 385 | unregister_kprobe(&tp->rp.kp); |
| 386 | tp->flags &= ~TP_FLAG_REGISTERED; |
| 387 | /* Cleanup kprobe for reuse */ |
| 388 | if (tp->rp.kp.symbol_name) |
| 389 | tp->rp.kp.addr = NULL; |
| 390 | } |
| 391 | } |
| 392 | |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 393 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 394 | static int unregister_trace_probe(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 395 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 396 | /* Enabled event can not be unregistered */ |
| 397 | if (trace_probe_is_enabled(tp)) |
| 398 | return -EBUSY; |
| 399 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 400 | __unregister_trace_probe(tp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 401 | list_del(&tp->list); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 402 | unregister_probe_event(tp); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 403 | |
| 404 | return 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | /* Register a trace_probe and probe_event */ |
| 408 | static int register_trace_probe(struct trace_probe *tp) |
| 409 | { |
| 410 | struct trace_probe *old_tp; |
| 411 | int ret; |
| 412 | |
| 413 | mutex_lock(&probe_lock); |
| 414 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 415 | /* Delete old (same name) event if exist */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 416 | old_tp = find_trace_probe(tp->call.name, tp->call.class->system); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 417 | if (old_tp) { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 418 | ret = unregister_trace_probe(old_tp); |
| 419 | if (ret < 0) |
| 420 | goto end; |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 421 | free_trace_probe(old_tp); |
| 422 | } |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 423 | |
| 424 | /* Register new event */ |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 425 | ret = register_probe_event(tp); |
| 426 | if (ret) { |
Paul Bolle | 426d310 | 2010-08-07 12:30:03 +0200 | [diff] [blame] | 427 | pr_warning("Failed to register probe event(%d)\n", ret); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 428 | goto end; |
| 429 | } |
| 430 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 431 | /* Register k*probe */ |
| 432 | ret = __register_trace_probe(tp); |
| 433 | if (ret < 0) |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 434 | unregister_probe_event(tp); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 435 | else |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 436 | list_add_tail(&tp->list, &probe_list); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 437 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 438 | end: |
| 439 | mutex_unlock(&probe_lock); |
| 440 | return ret; |
| 441 | } |
| 442 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 443 | /* Module notifier call back, checking event on the module */ |
| 444 | static int trace_probe_module_callback(struct notifier_block *nb, |
| 445 | unsigned long val, void *data) |
| 446 | { |
| 447 | struct module *mod = data; |
| 448 | struct trace_probe *tp; |
| 449 | int ret; |
| 450 | |
| 451 | if (val != MODULE_STATE_COMING) |
| 452 | return NOTIFY_DONE; |
| 453 | |
| 454 | /* Update probes on coming module */ |
| 455 | mutex_lock(&probe_lock); |
| 456 | list_for_each_entry(tp, &probe_list, list) { |
| 457 | if (trace_probe_within_module(tp, mod)) { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 458 | /* Don't need to check busy - this should have gone. */ |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 459 | __unregister_trace_probe(tp); |
| 460 | ret = __register_trace_probe(tp); |
| 461 | if (ret) |
| 462 | pr_warning("Failed to re-register probe %s on" |
| 463 | "%s: %d\n", |
| 464 | tp->call.name, mod->name, ret); |
| 465 | } |
| 466 | } |
| 467 | mutex_unlock(&probe_lock); |
| 468 | |
| 469 | return NOTIFY_DONE; |
| 470 | } |
| 471 | |
| 472 | static struct notifier_block trace_probe_module_nb = { |
| 473 | .notifier_call = trace_probe_module_callback, |
| 474 | .priority = 1 /* Invoked after kprobe module callback */ |
| 475 | }; |
| 476 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 477 | static int create_trace_probe(int argc, char **argv) |
| 478 | { |
| 479 | /* |
| 480 | * Argument syntax: |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 481 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
| 482 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 483 | * Fetch args: |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 484 | * $retval : fetch return value |
| 485 | * $stack : fetch stack address |
| 486 | * $stackN : fetch Nth of stack (N:0-) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 487 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
| 488 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) |
| 489 | * %REG : fetch register REG |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 490 | * Dereferencing memory fetch: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 491 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 492 | * Alias name of args: |
| 493 | * NAME=FETCHARG : set NAME as alias of FETCHARG. |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 494 | * Type of args: |
| 495 | * FETCHARG:TYPE : use TYPE instead of unsigned long. |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 496 | */ |
| 497 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 498 | int i, ret = 0; |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 499 | bool is_return = false, is_delete = false; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 500 | char *symbol = NULL, *event = NULL, *group = NULL; |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 501 | char *arg; |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 502 | unsigned long offset = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 503 | void *addr = NULL; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 504 | char buf[MAX_EVENT_NAME_LEN]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 505 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 506 | /* argc must be >= 1 */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 507 | if (argv[0][0] == 'p') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 508 | is_return = false; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 509 | else if (argv[0][0] == 'r') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 510 | is_return = true; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 511 | else if (argv[0][0] == '-') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 512 | is_delete = true; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 513 | else { |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 514 | pr_info("Probe definition must be started with 'p', 'r' or" |
| 515 | " '-'.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 516 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 517 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 518 | |
| 519 | if (argv[0][1] == ':') { |
| 520 | event = &argv[0][2]; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 521 | if (strchr(event, '/')) { |
| 522 | group = event; |
| 523 | event = strchr(group, '/') + 1; |
| 524 | event[-1] = '\0'; |
| 525 | if (strlen(group) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 526 | pr_info("Group name is not specified\n"); |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 527 | return -EINVAL; |
| 528 | } |
| 529 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 530 | if (strlen(event) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 531 | pr_info("Event name is not specified\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 532 | return -EINVAL; |
| 533 | } |
| 534 | } |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 535 | if (!group) |
| 536 | group = KPROBE_EVENT_SYSTEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 537 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 538 | if (is_delete) { |
| 539 | if (!event) { |
| 540 | pr_info("Delete command needs an event name.\n"); |
| 541 | return -EINVAL; |
| 542 | } |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 543 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 544 | tp = find_trace_probe(event, group); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 545 | if (!tp) { |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 546 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 547 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
| 548 | return -ENOENT; |
| 549 | } |
| 550 | /* delete an event */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 551 | ret = unregister_trace_probe(tp); |
| 552 | if (ret == 0) |
| 553 | free_trace_probe(tp); |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 554 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 555 | return ret; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | if (argc < 2) { |
| 559 | pr_info("Probe point is not specified.\n"); |
| 560 | return -EINVAL; |
| 561 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 562 | if (isdigit(argv[1][0])) { |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 563 | if (is_return) { |
| 564 | pr_info("Return probe point must be a symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 565 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 566 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 567 | /* an address specified */ |
Daniel Walter | bcd83ea | 2012-09-26 22:08:38 +0200 | [diff] [blame] | 568 | ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 569 | if (ret) { |
| 570 | pr_info("Failed to parse address.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 571 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 572 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 573 | } else { |
| 574 | /* a symbol specified */ |
| 575 | symbol = argv[1]; |
| 576 | /* TODO: support .init module functions */ |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 577 | ret = traceprobe_split_symbol_offset(symbol, &offset); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 578 | if (ret) { |
| 579 | pr_info("Failed to parse symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 580 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 581 | } |
| 582 | if (offset && is_return) { |
| 583 | pr_info("Return probe must be used without offset.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 584 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 585 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 586 | } |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 587 | argc -= 2; argv += 2; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 588 | |
| 589 | /* setup a probe */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 590 | if (!event) { |
| 591 | /* Make a new event name */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 592 | if (symbol) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 593 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 594 | is_return ? 'r' : 'p', symbol, offset); |
| 595 | else |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 596 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 597 | is_return ? 'r' : 'p', addr); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 598 | event = buf; |
| 599 | } |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 600 | tp = alloc_trace_probe(group, event, addr, symbol, offset, argc, |
| 601 | is_return); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 602 | if (IS_ERR(tp)) { |
| 603 | pr_info("Failed to allocate trace_probe.(%d)\n", |
| 604 | (int)PTR_ERR(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 605 | return PTR_ERR(tp); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 606 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 607 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 608 | /* parse arguments */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 609 | ret = 0; |
| 610 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
Masami Hiramatsu | 61a5273 | 2010-08-27 20:38:46 +0900 | [diff] [blame] | 611 | /* Increment count for freeing args in error case */ |
| 612 | tp->nr_args++; |
| 613 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 614 | /* Parse argument name */ |
| 615 | arg = strchr(argv[i], '='); |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 616 | if (arg) { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 617 | *arg++ = '\0'; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 618 | tp->args[i].name = kstrdup(argv[i], GFP_KERNEL); |
| 619 | } else { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 620 | arg = argv[i]; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 621 | /* If argument name is omitted, set "argN" */ |
| 622 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); |
| 623 | tp->args[i].name = kstrdup(buf, GFP_KERNEL); |
| 624 | } |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 625 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 626 | if (!tp->args[i].name) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 627 | pr_info("Failed to allocate argument[%d] name.\n", i); |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 628 | ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 629 | goto error; |
| 630 | } |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 631 | |
| 632 | if (!is_good_name(tp->args[i].name)) { |
| 633 | pr_info("Invalid argument[%d] name: %s\n", |
| 634 | i, tp->args[i].name); |
| 635 | ret = -EINVAL; |
| 636 | goto error; |
| 637 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 638 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 639 | if (traceprobe_conflict_field_name(tp->args[i].name, |
| 640 | tp->args, i)) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 641 | pr_info("Argument[%d] name '%s' conflicts with " |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 642 | "another field.\n", i, argv[i]); |
| 643 | ret = -EINVAL; |
| 644 | goto error; |
| 645 | } |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 646 | |
| 647 | /* Parse fetch argument */ |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 648 | ret = traceprobe_parse_probe_arg(arg, &tp->size, &tp->args[i], |
Srikar Dronamraju | f3f096c | 2012-04-11 16:00:43 +0530 | [diff] [blame] | 649 | is_return, true); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 650 | if (ret) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 651 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 652 | goto error; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 653 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 654 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 655 | |
| 656 | ret = register_trace_probe(tp); |
| 657 | if (ret) |
| 658 | goto error; |
| 659 | return 0; |
| 660 | |
| 661 | error: |
| 662 | free_trace_probe(tp); |
| 663 | return ret; |
| 664 | } |
| 665 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 666 | static int release_all_trace_probes(void) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 667 | { |
| 668 | struct trace_probe *tp; |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 669 | int ret = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 670 | |
| 671 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 672 | /* Ensure no probe is in use. */ |
| 673 | list_for_each_entry(tp, &probe_list, list) |
| 674 | if (trace_probe_is_enabled(tp)) { |
| 675 | ret = -EBUSY; |
| 676 | goto end; |
| 677 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 678 | /* TODO: Use batch unregistration */ |
| 679 | while (!list_empty(&probe_list)) { |
| 680 | tp = list_entry(probe_list.next, struct trace_probe, list); |
| 681 | unregister_trace_probe(tp); |
| 682 | free_trace_probe(tp); |
| 683 | } |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 684 | |
| 685 | end: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 686 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 687 | |
| 688 | return ret; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 689 | } |
| 690 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 691 | /* Probes listing interfaces */ |
| 692 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) |
| 693 | { |
| 694 | mutex_lock(&probe_lock); |
| 695 | return seq_list_start(&probe_list, *pos); |
| 696 | } |
| 697 | |
| 698 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| 699 | { |
| 700 | return seq_list_next(v, &probe_list, pos); |
| 701 | } |
| 702 | |
| 703 | static void probes_seq_stop(struct seq_file *m, void *v) |
| 704 | { |
| 705 | mutex_unlock(&probe_lock); |
| 706 | } |
| 707 | |
| 708 | static int probes_seq_show(struct seq_file *m, void *v) |
| 709 | { |
| 710 | struct trace_probe *tp = v; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 711 | int i; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 712 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 713 | seq_printf(m, "%c", trace_probe_is_return(tp) ? 'r' : 'p'); |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 714 | seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 715 | |
Lai Jiangshan | 52a11f3 | 2009-11-25 16:33:15 +0800 | [diff] [blame] | 716 | if (!tp->symbol) |
| 717 | seq_printf(m, " 0x%p", tp->rp.kp.addr); |
| 718 | else if (tp->rp.kp.offset) |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 719 | seq_printf(m, " %s+%u", trace_probe_symbol(tp), |
| 720 | tp->rp.kp.offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 721 | else |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 722 | seq_printf(m, " %s", trace_probe_symbol(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 723 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 724 | for (i = 0; i < tp->nr_args; i++) |
| 725 | seq_printf(m, " %s=%s", tp->args[i].name, tp->args[i].comm); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 726 | seq_printf(m, "\n"); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 727 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 728 | return 0; |
| 729 | } |
| 730 | |
| 731 | static const struct seq_operations probes_seq_op = { |
| 732 | .start = probes_seq_start, |
| 733 | .next = probes_seq_next, |
| 734 | .stop = probes_seq_stop, |
| 735 | .show = probes_seq_show |
| 736 | }; |
| 737 | |
| 738 | static int probes_open(struct inode *inode, struct file *file) |
| 739 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 740 | int ret; |
| 741 | |
| 742 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
| 743 | ret = release_all_trace_probes(); |
| 744 | if (ret < 0) |
| 745 | return ret; |
| 746 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 747 | |
| 748 | return seq_open(file, &probes_seq_op); |
| 749 | } |
| 750 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 751 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
| 752 | size_t count, loff_t *ppos) |
| 753 | { |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 754 | return traceprobe_probes_write(file, buffer, count, ppos, |
| 755 | create_trace_probe); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | static const struct file_operations kprobe_events_ops = { |
| 759 | .owner = THIS_MODULE, |
| 760 | .open = probes_open, |
| 761 | .read = seq_read, |
| 762 | .llseek = seq_lseek, |
| 763 | .release = seq_release, |
| 764 | .write = probes_write, |
| 765 | }; |
| 766 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 767 | /* Probes profiling interfaces */ |
| 768 | static int probes_profile_seq_show(struct seq_file *m, void *v) |
| 769 | { |
| 770 | struct trace_probe *tp = v; |
| 771 | |
| 772 | seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 773 | tp->rp.kp.nmissed); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 774 | |
| 775 | return 0; |
| 776 | } |
| 777 | |
| 778 | static const struct seq_operations profile_seq_op = { |
| 779 | .start = probes_seq_start, |
| 780 | .next = probes_seq_next, |
| 781 | .stop = probes_seq_stop, |
| 782 | .show = probes_profile_seq_show |
| 783 | }; |
| 784 | |
| 785 | static int profile_open(struct inode *inode, struct file *file) |
| 786 | { |
| 787 | return seq_open(file, &profile_seq_op); |
| 788 | } |
| 789 | |
| 790 | static const struct file_operations kprobe_profile_ops = { |
| 791 | .owner = THIS_MODULE, |
| 792 | .open = profile_open, |
| 793 | .read = seq_read, |
| 794 | .llseek = seq_lseek, |
| 795 | .release = seq_release, |
| 796 | }; |
| 797 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 798 | /* Sum up total data length for dynamic arraies (strings) */ |
| 799 | static __kprobes int __get_data_size(struct trace_probe *tp, |
| 800 | struct pt_regs *regs) |
| 801 | { |
| 802 | int i, ret = 0; |
| 803 | u32 len; |
| 804 | |
| 805 | for (i = 0; i < tp->nr_args; i++) |
| 806 | if (unlikely(tp->args[i].fetch_size.fn)) { |
| 807 | call_fetch(&tp->args[i].fetch_size, regs, &len); |
| 808 | ret += len; |
| 809 | } |
| 810 | |
| 811 | return ret; |
| 812 | } |
| 813 | |
| 814 | /* Store the value of each argument */ |
| 815 | static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp, |
| 816 | struct pt_regs *regs, |
| 817 | u8 *data, int maxlen) |
| 818 | { |
| 819 | int i; |
| 820 | u32 end = tp->size; |
| 821 | u32 *dl; /* Data (relative) location */ |
| 822 | |
| 823 | for (i = 0; i < tp->nr_args; i++) { |
| 824 | if (unlikely(tp->args[i].fetch_size.fn)) { |
| 825 | /* |
| 826 | * First, we set the relative location and |
| 827 | * maximum data length to *dl |
| 828 | */ |
| 829 | dl = (u32 *)(data + tp->args[i].offset); |
| 830 | *dl = make_data_rloc(maxlen, end - tp->args[i].offset); |
| 831 | /* Then try to fetch string or dynamic array data */ |
| 832 | call_fetch(&tp->args[i].fetch, regs, dl); |
| 833 | /* Reduce maximum length */ |
| 834 | end += get_rloc_len(*dl); |
| 835 | maxlen -= get_rloc_len(*dl); |
| 836 | /* Trick here, convert data_rloc to data_loc */ |
| 837 | *dl = convert_rloc_to_loc(*dl, |
| 838 | ent_size + tp->args[i].offset); |
| 839 | } else |
| 840 | /* Just fetching data normally */ |
| 841 | call_fetch(&tp->args[i].fetch, regs, |
| 842 | data + tp->args[i].offset); |
| 843 | } |
| 844 | } |
| 845 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 846 | /* Kprobe handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 847 | static __kprobes void |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 848 | __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs, |
| 849 | struct ftrace_event_file *ftrace_file) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 850 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 851 | struct kprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 852 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 853 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 854 | int size, dsize, pc; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 855 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 856 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 857 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 858 | WARN_ON(call != ftrace_file->event_call); |
| 859 | |
Masami Hiramatsu | b882008 | 2013-05-09 14:44:54 +0900 | [diff] [blame] | 860 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
| 861 | return; |
| 862 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 863 | local_save_flags(irq_flags); |
| 864 | pc = preempt_count(); |
| 865 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 866 | dsize = __get_data_size(tp, regs); |
| 867 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 868 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 869 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
| 870 | call->event.type, |
| 871 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 872 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 873 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 874 | |
| 875 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 876 | entry->ip = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 877 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 878 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 879 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Steven Rostedt | 0d5c6e1 | 2012-11-01 20:54:21 -0400 | [diff] [blame] | 880 | trace_buffer_unlock_commit_regs(buffer, event, |
| 881 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 882 | } |
| 883 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 884 | static __kprobes void |
| 885 | kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs) |
| 886 | { |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 887 | /* |
| 888 | * Note: preempt is already disabled around the kprobe handler. |
| 889 | * However, we still need an smp_read_barrier_depends() corresponding |
| 890 | * to smp_wmb() in rcu_assign_pointer() to access the pointer. |
| 891 | */ |
| 892 | struct ftrace_event_file **file = rcu_dereference_raw(tp->files); |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 893 | |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 894 | if (unlikely(!file)) |
| 895 | return; |
| 896 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 897 | while (*file) { |
| 898 | __kprobe_trace_func(tp, regs, *file); |
| 899 | file++; |
| 900 | } |
| 901 | } |
| 902 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 903 | /* Kretprobe handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 904 | static __kprobes void |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 905 | __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri, |
| 906 | struct pt_regs *regs, |
| 907 | struct ftrace_event_file *ftrace_file) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 908 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 909 | struct kretprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 910 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 911 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 912 | int size, pc, dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 913 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 914 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 915 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 916 | WARN_ON(call != ftrace_file->event_call); |
| 917 | |
Masami Hiramatsu | b882008 | 2013-05-09 14:44:54 +0900 | [diff] [blame] | 918 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
| 919 | return; |
| 920 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 921 | local_save_flags(irq_flags); |
| 922 | pc = preempt_count(); |
| 923 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 924 | dsize = __get_data_size(tp, regs); |
| 925 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 926 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 927 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
| 928 | call->event.type, |
| 929 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 930 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 931 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 932 | |
| 933 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 934 | entry->func = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 935 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 936 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 937 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 938 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Steven Rostedt | 0d5c6e1 | 2012-11-01 20:54:21 -0400 | [diff] [blame] | 939 | trace_buffer_unlock_commit_regs(buffer, event, |
| 940 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 941 | } |
| 942 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 943 | static __kprobes void |
| 944 | kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri, |
| 945 | struct pt_regs *regs) |
| 946 | { |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 947 | /* |
| 948 | * Note: preempt is already disabled around the kprobe handler. |
| 949 | * However, we still need an smp_read_barrier_depends() corresponding |
| 950 | * to smp_wmb() in rcu_assign_pointer() to access the pointer. |
| 951 | */ |
| 952 | struct ftrace_event_file **file = rcu_dereference_raw(tp->files); |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 953 | |
Masami Hiramatsu | c02c7e6 | 2013-05-13 20:58:34 +0900 | [diff] [blame] | 954 | if (unlikely(!file)) |
| 955 | return; |
| 956 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 957 | while (*file) { |
| 958 | __kretprobe_trace_func(tp, ri, regs, *file); |
| 959 | file++; |
| 960 | } |
| 961 | } |
| 962 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 963 | /* Event entry printers */ |
Masami Hiramatsu | b62fdd9 | 2013-05-13 20:58:39 +0900 | [diff] [blame] | 964 | static enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 965 | print_kprobe_event(struct trace_iterator *iter, int flags, |
| 966 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 967 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 968 | struct kprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 969 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 970 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 971 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 972 | int i; |
| 973 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 974 | field = (struct kprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 975 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 976 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 977 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 978 | goto partial; |
| 979 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 980 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 981 | goto partial; |
| 982 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 983 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 984 | goto partial; |
| 985 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 986 | data = (u8 *)&field[1]; |
| 987 | for (i = 0; i < tp->nr_args; i++) |
| 988 | if (!tp->args[i].type->print(s, tp->args[i].name, |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 989 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 990 | goto partial; |
| 991 | |
| 992 | if (!trace_seq_puts(s, "\n")) |
| 993 | goto partial; |
| 994 | |
| 995 | return TRACE_TYPE_HANDLED; |
| 996 | partial: |
| 997 | return TRACE_TYPE_PARTIAL_LINE; |
| 998 | } |
| 999 | |
Masami Hiramatsu | b62fdd9 | 2013-05-13 20:58:39 +0900 | [diff] [blame] | 1000 | static enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1001 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
| 1002 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1003 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1004 | struct kretprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1005 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1006 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1007 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1008 | int i; |
| 1009 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1010 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1011 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1012 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1013 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 1014 | goto partial; |
| 1015 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1016 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 1017 | goto partial; |
| 1018 | |
| 1019 | if (!trace_seq_puts(s, " <- ")) |
| 1020 | goto partial; |
| 1021 | |
| 1022 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) |
| 1023 | goto partial; |
| 1024 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 1025 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1026 | goto partial; |
| 1027 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1028 | data = (u8 *)&field[1]; |
| 1029 | for (i = 0; i < tp->nr_args; i++) |
| 1030 | if (!tp->args[i].type->print(s, tp->args[i].name, |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1031 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1032 | goto partial; |
| 1033 | |
| 1034 | if (!trace_seq_puts(s, "\n")) |
| 1035 | goto partial; |
| 1036 | |
| 1037 | return TRACE_TYPE_HANDLED; |
| 1038 | partial: |
| 1039 | return TRACE_TYPE_PARTIAL_LINE; |
| 1040 | } |
| 1041 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1042 | |
| 1043 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 1044 | { |
| 1045 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1046 | struct kprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1047 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 1048 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1049 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1050 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1051 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1052 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1053 | tp->args[i].name, |
| 1054 | sizeof(field) + tp->args[i].offset, |
| 1055 | tp->args[i].type->size, |
| 1056 | tp->args[i].type->is_signed, |
| 1057 | FILTER_OTHER); |
| 1058 | if (ret) |
| 1059 | return ret; |
| 1060 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 1065 | { |
| 1066 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1067 | struct kretprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1068 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 1069 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 1070 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
| 1071 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 1072 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1073 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1074 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1075 | tp->args[i].name, |
| 1076 | sizeof(field) + tp->args[i].offset, |
| 1077 | tp->args[i].type->size, |
| 1078 | tp->args[i].type->is_signed, |
| 1079 | FILTER_OTHER); |
| 1080 | if (ret) |
| 1081 | return ret; |
| 1082 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1083 | return 0; |
| 1084 | } |
| 1085 | |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1086 | static int __set_print_fmt(struct trace_probe *tp, char *buf, int len) |
| 1087 | { |
| 1088 | int i; |
| 1089 | int pos = 0; |
| 1090 | |
| 1091 | const char *fmt, *arg; |
| 1092 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1093 | if (!trace_probe_is_return(tp)) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1094 | fmt = "(%lx)"; |
| 1095 | arg = "REC->" FIELD_STRING_IP; |
| 1096 | } else { |
| 1097 | fmt = "(%lx <- %lx)"; |
| 1098 | arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP; |
| 1099 | } |
| 1100 | |
| 1101 | /* When len=0, we just calculate the needed length */ |
| 1102 | #define LEN_OR_ZERO (len ? len - pos : 0) |
| 1103 | |
| 1104 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt); |
| 1105 | |
| 1106 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1107 | pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s", |
| 1108 | tp->args[i].name, tp->args[i].type->fmt); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1109 | } |
| 1110 | |
| 1111 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg); |
| 1112 | |
| 1113 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1114 | if (strcmp(tp->args[i].type->name, "string") == 0) |
| 1115 | pos += snprintf(buf + pos, LEN_OR_ZERO, |
| 1116 | ", __get_str(%s)", |
| 1117 | tp->args[i].name); |
| 1118 | else |
| 1119 | pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s", |
| 1120 | tp->args[i].name); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1121 | } |
| 1122 | |
| 1123 | #undef LEN_OR_ZERO |
| 1124 | |
| 1125 | /* return the length of print_fmt */ |
| 1126 | return pos; |
| 1127 | } |
| 1128 | |
| 1129 | static int set_print_fmt(struct trace_probe *tp) |
| 1130 | { |
| 1131 | int len; |
| 1132 | char *print_fmt; |
| 1133 | |
| 1134 | /* First: called with 0 length to calculate the needed length */ |
| 1135 | len = __set_print_fmt(tp, NULL, 0); |
| 1136 | print_fmt = kmalloc(len + 1, GFP_KERNEL); |
| 1137 | if (!print_fmt) |
| 1138 | return -ENOMEM; |
| 1139 | |
| 1140 | /* Second: actually write the @print_fmt */ |
| 1141 | __set_print_fmt(tp, print_fmt, len + 1); |
| 1142 | tp->call.print_fmt = print_fmt; |
| 1143 | |
| 1144 | return 0; |
| 1145 | } |
| 1146 | |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1147 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1148 | |
| 1149 | /* Kprobe profile handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1150 | static __kprobes void |
| 1151 | kprobe_perf_func(struct trace_probe *tp, struct pt_regs *regs) |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1152 | { |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1153 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1154 | struct kprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1155 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1156 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1157 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1158 | |
Oleg Nesterov | 288e984 | 2013-06-20 19:38:06 +0200 | [diff] [blame^] | 1159 | head = this_cpu_ptr(call->perf_events); |
| 1160 | if (hlist_empty(head)) |
| 1161 | return; |
| 1162 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1163 | dsize = __get_data_size(tp, regs); |
| 1164 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1165 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1166 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1167 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1168 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1169 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1170 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 1171 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 1172 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1173 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1174 | |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1175 | entry->ip = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1176 | memset(&entry[1], 0, dsize); |
| 1177 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 1178 | perf_trace_buf_submit(entry, size, rctx, |
| 1179 | entry->ip, 1, regs, head, NULL); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1180 | } |
| 1181 | |
| 1182 | /* Kretprobe profile handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1183 | static __kprobes void |
| 1184 | kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri, |
| 1185 | struct pt_regs *regs) |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1186 | { |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1187 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1188 | struct kretprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1189 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1190 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1191 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1192 | |
Oleg Nesterov | 288e984 | 2013-06-20 19:38:06 +0200 | [diff] [blame^] | 1193 | head = this_cpu_ptr(call->perf_events); |
| 1194 | if (hlist_empty(head)) |
| 1195 | return; |
| 1196 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1197 | dsize = __get_data_size(tp, regs); |
| 1198 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1199 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1200 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1201 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1202 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1203 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1204 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 1205 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 1206 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1207 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1208 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1209 | entry->func = (unsigned long)tp->rp.kp.addr; |
| 1210 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1211 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 1212 | perf_trace_buf_submit(entry, size, rctx, |
| 1213 | entry->ret_ip, 1, regs, head, NULL); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1214 | } |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1215 | #endif /* CONFIG_PERF_EVENTS */ |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1216 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1217 | static __kprobes |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1218 | int kprobe_register(struct ftrace_event_call *event, |
| 1219 | enum trace_reg type, void *data) |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1220 | { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1221 | struct trace_probe *tp = (struct trace_probe *)event->data; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1222 | struct ftrace_event_file *file = data; |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1223 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1224 | switch (type) { |
| 1225 | case TRACE_REG_REGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1226 | return enable_trace_probe(tp, file); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1227 | case TRACE_REG_UNREGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1228 | return disable_trace_probe(tp, file); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1229 | |
| 1230 | #ifdef CONFIG_PERF_EVENTS |
| 1231 | case TRACE_REG_PERF_REGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1232 | return enable_trace_probe(tp, NULL); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1233 | case TRACE_REG_PERF_UNREGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1234 | return disable_trace_probe(tp, NULL); |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1235 | case TRACE_REG_PERF_OPEN: |
| 1236 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 1237 | case TRACE_REG_PERF_ADD: |
| 1238 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1239 | return 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1240 | #endif |
| 1241 | } |
| 1242 | return 0; |
| 1243 | } |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1244 | |
| 1245 | static __kprobes |
| 1246 | int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) |
| 1247 | { |
| 1248 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
| 1249 | |
Masami Hiramatsu | 48182bd | 2013-05-09 14:44:36 +0900 | [diff] [blame] | 1250 | tp->nhit++; |
| 1251 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1252 | if (tp->flags & TP_FLAG_TRACE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1253 | kprobe_trace_func(tp, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1254 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1255 | if (tp->flags & TP_FLAG_PROFILE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1256 | kprobe_perf_func(tp, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1257 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1258 | return 0; /* We don't tweek kernel, so just return 0 */ |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1259 | } |
| 1260 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1261 | static __kprobes |
| 1262 | int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) |
| 1263 | { |
| 1264 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
| 1265 | |
Masami Hiramatsu | 48182bd | 2013-05-09 14:44:36 +0900 | [diff] [blame] | 1266 | tp->nhit++; |
| 1267 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1268 | if (tp->flags & TP_FLAG_TRACE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1269 | kretprobe_trace_func(tp, ri, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1270 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1271 | if (tp->flags & TP_FLAG_PROFILE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1272 | kretprobe_perf_func(tp, ri, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1273 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1274 | return 0; /* We don't tweek kernel, so just return 0 */ |
| 1275 | } |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1276 | |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1277 | static struct trace_event_functions kretprobe_funcs = { |
| 1278 | .trace = print_kretprobe_event |
| 1279 | }; |
| 1280 | |
| 1281 | static struct trace_event_functions kprobe_funcs = { |
| 1282 | .trace = print_kprobe_event |
| 1283 | }; |
| 1284 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1285 | static int register_probe_event(struct trace_probe *tp) |
| 1286 | { |
| 1287 | struct ftrace_event_call *call = &tp->call; |
| 1288 | int ret; |
| 1289 | |
| 1290 | /* Initialize ftrace_event_call */ |
Li Zefan | ffb9f99 | 2010-05-24 16:24:52 +0800 | [diff] [blame] | 1291 | INIT_LIST_HEAD(&call->class->fields); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1292 | if (trace_probe_is_return(tp)) { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1293 | call->event.funcs = &kretprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1294 | call->class->define_fields = kretprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1295 | } else { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1296 | call->event.funcs = &kprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1297 | call->class->define_fields = kprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1298 | } |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1299 | if (set_print_fmt(tp) < 0) |
| 1300 | return -ENOMEM; |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 1301 | ret = register_ftrace_event(&call->event); |
| 1302 | if (!ret) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1303 | kfree(call->print_fmt); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1304 | return -ENODEV; |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1305 | } |
Steven Rostedt | 553552c | 2010-04-23 11:12:36 -0400 | [diff] [blame] | 1306 | call->flags = 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1307 | call->class->reg = kprobe_register; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1308 | call->data = tp; |
| 1309 | ret = trace_add_event_call(call); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1310 | if (ret) { |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1311 | pr_info("Failed to register kprobe event: %s\n", call->name); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1312 | kfree(call->print_fmt); |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1313 | unregister_ftrace_event(&call->event); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1314 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1315 | return ret; |
| 1316 | } |
| 1317 | |
| 1318 | static void unregister_probe_event(struct trace_probe *tp) |
| 1319 | { |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1320 | /* tp->event is unregistered in trace_remove_event_call() */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1321 | trace_remove_event_call(&tp->call); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1322 | kfree(tp->call.print_fmt); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1323 | } |
| 1324 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1325 | /* Make a debugfs interface for controlling probe points */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1326 | static __init int init_kprobe_trace(void) |
| 1327 | { |
| 1328 | struct dentry *d_tracer; |
| 1329 | struct dentry *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1330 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 1331 | if (register_module_notifier(&trace_probe_module_nb)) |
| 1332 | return -EINVAL; |
| 1333 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1334 | d_tracer = tracing_init_dentry(); |
| 1335 | if (!d_tracer) |
| 1336 | return 0; |
| 1337 | |
| 1338 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, |
| 1339 | NULL, &kprobe_events_ops); |
| 1340 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1341 | /* Event list interface */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1342 | if (!entry) |
| 1343 | pr_warning("Could not create debugfs " |
| 1344 | "'kprobe_events' entry\n"); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1345 | |
| 1346 | /* Profile interface */ |
| 1347 | entry = debugfs_create_file("kprobe_profile", 0444, d_tracer, |
| 1348 | NULL, &kprobe_profile_ops); |
| 1349 | |
| 1350 | if (!entry) |
| 1351 | pr_warning("Could not create debugfs " |
| 1352 | "'kprobe_profile' entry\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1353 | return 0; |
| 1354 | } |
| 1355 | fs_initcall(init_kprobe_trace); |
| 1356 | |
| 1357 | |
| 1358 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 1359 | |
Steven Rostedt | 265a5b7 | 2011-06-06 22:35:13 -0400 | [diff] [blame] | 1360 | /* |
| 1361 | * The "__used" keeps gcc from removing the function symbol |
| 1362 | * from the kallsyms table. |
| 1363 | */ |
| 1364 | static __used int kprobe_trace_selftest_target(int a1, int a2, int a3, |
| 1365 | int a4, int a5, int a6) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1366 | { |
| 1367 | return a1 + a2 + a3 + a4 + a5 + a6; |
| 1368 | } |
| 1369 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1370 | static struct ftrace_event_file * |
| 1371 | find_trace_probe_file(struct trace_probe *tp, struct trace_array *tr) |
| 1372 | { |
| 1373 | struct ftrace_event_file *file; |
| 1374 | |
| 1375 | list_for_each_entry(file, &tr->events, list) |
| 1376 | if (file->event_call == &tp->call) |
| 1377 | return file; |
| 1378 | |
| 1379 | return NULL; |
| 1380 | } |
| 1381 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1382 | static __init int kprobe_trace_self_tests_init(void) |
| 1383 | { |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1384 | int ret, warn = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1385 | int (*target)(int, int, int, int, int, int); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1386 | struct trace_probe *tp; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1387 | struct ftrace_event_file *file; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1388 | |
| 1389 | target = kprobe_trace_selftest_target; |
| 1390 | |
| 1391 | pr_info("Testing kprobe tracing: "); |
| 1392 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1393 | ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target " |
| 1394 | "$stack $stack0 +0($stack)", |
| 1395 | create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1396 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1397 | pr_warn("error on probing function entry.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1398 | warn++; |
| 1399 | } else { |
| 1400 | /* Enable trace point */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1401 | tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1402 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1403 | pr_warn("error on getting new probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1404 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1405 | } else { |
| 1406 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1407 | if (WARN_ON_ONCE(file == NULL)) { |
| 1408 | pr_warn("error on getting probe file.\n"); |
| 1409 | warn++; |
| 1410 | } else |
| 1411 | enable_trace_probe(tp, file); |
| 1412 | } |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1413 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1414 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1415 | ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target " |
| 1416 | "$retval", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1417 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1418 | pr_warn("error on probing function return.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1419 | warn++; |
| 1420 | } else { |
| 1421 | /* Enable trace point */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1422 | tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1423 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1424 | pr_warn("error on getting 2nd new probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1425 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1426 | } else { |
| 1427 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1428 | if (WARN_ON_ONCE(file == NULL)) { |
| 1429 | pr_warn("error on getting probe file.\n"); |
| 1430 | warn++; |
| 1431 | } else |
| 1432 | enable_trace_probe(tp, file); |
| 1433 | } |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1434 | } |
| 1435 | |
| 1436 | if (warn) |
| 1437 | goto end; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1438 | |
| 1439 | ret = target(1, 2, 3, 4, 5, 6); |
| 1440 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1441 | /* Disable trace points before removing it */ |
| 1442 | tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM); |
| 1443 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1444 | pr_warn("error on getting test probe.\n"); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1445 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1446 | } else { |
| 1447 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1448 | if (WARN_ON_ONCE(file == NULL)) { |
| 1449 | pr_warn("error on getting probe file.\n"); |
| 1450 | warn++; |
| 1451 | } else |
| 1452 | disable_trace_probe(tp, file); |
| 1453 | } |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1454 | |
| 1455 | tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM); |
| 1456 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1457 | pr_warn("error on getting 2nd test probe.\n"); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1458 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1459 | } else { |
| 1460 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1461 | if (WARN_ON_ONCE(file == NULL)) { |
| 1462 | pr_warn("error on getting probe file.\n"); |
| 1463 | warn++; |
| 1464 | } else |
| 1465 | disable_trace_probe(tp, file); |
| 1466 | } |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1467 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1468 | ret = traceprobe_command("-:testprobe", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1469 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1470 | pr_warn("error on deleting a probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1471 | warn++; |
| 1472 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1473 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1474 | ret = traceprobe_command("-:testprobe2", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1475 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1476 | pr_warn("error on deleting a probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1477 | warn++; |
| 1478 | } |
| 1479 | |
| 1480 | end: |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1481 | release_all_trace_probes(); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1482 | if (warn) |
| 1483 | pr_cont("NG: Some tests are failed. Please check them.\n"); |
| 1484 | else |
| 1485 | pr_cont("OK\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1486 | return 0; |
| 1487 | } |
| 1488 | |
| 1489 | late_initcall(kprobe_trace_self_tests_init); |
| 1490 | |
| 1491 | #endif |