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; |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 38 | struct list_head 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 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 44 | struct event_file_link { |
| 45 | struct ftrace_event_file *file; |
| 46 | struct list_head list; |
| 47 | }; |
| 48 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 49 | #define SIZEOF_TRACE_PROBE(n) \ |
| 50 | (offsetof(struct trace_probe, args) + \ |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 51 | (sizeof(struct probe_arg) * (n))) |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 52 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 53 | |
Masami Hiramatsu | db02038 | 2013-05-09 14:44:32 +0900 | [diff] [blame] | 54 | static __kprobes bool trace_probe_is_return(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 55 | { |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 56 | return tp->rp.handler != NULL; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 57 | } |
| 58 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 59 | static __kprobes const char *trace_probe_symbol(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 60 | { |
| 61 | return tp->symbol ? tp->symbol : "unknown"; |
| 62 | } |
| 63 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 64 | static __kprobes unsigned long trace_probe_offset(struct trace_probe *tp) |
| 65 | { |
| 66 | return tp->rp.kp.offset; |
| 67 | } |
| 68 | |
| 69 | static __kprobes bool trace_probe_is_enabled(struct trace_probe *tp) |
| 70 | { |
| 71 | return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE)); |
| 72 | } |
| 73 | |
| 74 | static __kprobes bool trace_probe_is_registered(struct trace_probe *tp) |
| 75 | { |
| 76 | return !!(tp->flags & TP_FLAG_REGISTERED); |
| 77 | } |
| 78 | |
| 79 | static __kprobes bool trace_probe_has_gone(struct trace_probe *tp) |
| 80 | { |
| 81 | return !!(kprobe_gone(&tp->rp.kp)); |
| 82 | } |
| 83 | |
| 84 | static __kprobes bool trace_probe_within_module(struct trace_probe *tp, |
| 85 | struct module *mod) |
| 86 | { |
| 87 | int len = strlen(mod->name); |
| 88 | const char *name = trace_probe_symbol(tp); |
| 89 | return strncmp(mod->name, name, len) == 0 && name[len] == ':'; |
| 90 | } |
| 91 | |
| 92 | static __kprobes bool trace_probe_is_on_module(struct trace_probe *tp) |
| 93 | { |
| 94 | return !!strchr(trace_probe_symbol(tp), ':'); |
| 95 | } |
| 96 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 97 | static int register_probe_event(struct trace_probe *tp); |
| 98 | static void unregister_probe_event(struct trace_probe *tp); |
| 99 | |
| 100 | static DEFINE_MUTEX(probe_lock); |
| 101 | static LIST_HEAD(probe_list); |
| 102 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 103 | static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs); |
| 104 | static int kretprobe_dispatcher(struct kretprobe_instance *ri, |
| 105 | struct pt_regs *regs); |
| 106 | |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 107 | /* |
| 108 | * Allocate new trace_probe and initialize it (including kprobes). |
| 109 | */ |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 110 | static struct trace_probe *alloc_trace_probe(const char *group, |
| 111 | const char *event, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 112 | void *addr, |
| 113 | const char *symbol, |
| 114 | unsigned long offs, |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 115 | int nargs, bool is_return) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 116 | { |
| 117 | struct trace_probe *tp; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 118 | int ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 119 | |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 120 | tp = kzalloc(SIZEOF_TRACE_PROBE(nargs), GFP_KERNEL); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 121 | if (!tp) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 122 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 123 | |
| 124 | if (symbol) { |
| 125 | tp->symbol = kstrdup(symbol, GFP_KERNEL); |
| 126 | if (!tp->symbol) |
| 127 | goto error; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 128 | tp->rp.kp.symbol_name = tp->symbol; |
| 129 | tp->rp.kp.offset = offs; |
| 130 | } else |
| 131 | tp->rp.kp.addr = addr; |
| 132 | |
| 133 | if (is_return) |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 134 | tp->rp.handler = kretprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 135 | else |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 136 | tp->rp.kp.pre_handler = kprobe_dispatcher; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 137 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 138 | if (!event || !is_good_name(event)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 139 | ret = -EINVAL; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 140 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 141 | } |
| 142 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 143 | tp->call.class = &tp->class; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 144 | tp->call.name = kstrdup(event, GFP_KERNEL); |
| 145 | if (!tp->call.name) |
| 146 | goto error; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 147 | |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 148 | if (!group || !is_good_name(group)) { |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 149 | ret = -EINVAL; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 150 | goto error; |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 151 | } |
| 152 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 153 | tp->class.system = kstrdup(group, GFP_KERNEL); |
| 154 | if (!tp->class.system) |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 155 | goto error; |
| 156 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 157 | INIT_LIST_HEAD(&tp->list); |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 158 | INIT_LIST_HEAD(&tp->files); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 159 | return tp; |
| 160 | error: |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 161 | kfree(tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 162 | kfree(tp->symbol); |
| 163 | kfree(tp); |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 164 | return ERR_PTR(ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | static void free_trace_probe(struct trace_probe *tp) |
| 168 | { |
| 169 | int i; |
| 170 | |
| 171 | for (i = 0; i < tp->nr_args; i++) |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 172 | traceprobe_free_probe_arg(&tp->args[i]); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 173 | |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 174 | kfree(tp->call.class->system); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 175 | kfree(tp->call.name); |
| 176 | kfree(tp->symbol); |
| 177 | kfree(tp); |
| 178 | } |
| 179 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 180 | static struct trace_probe *find_trace_probe(const char *event, |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 181 | const char *group) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 182 | { |
| 183 | struct trace_probe *tp; |
| 184 | |
| 185 | list_for_each_entry(tp, &probe_list, list) |
Masami Hiramatsu | dd004c4 | 2009-10-27 16:42:44 -0400 | [diff] [blame] | 186 | if (strcmp(tp->call.name, event) == 0 && |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 187 | strcmp(tp->call.class->system, group) == 0) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 188 | return tp; |
| 189 | return NULL; |
| 190 | } |
| 191 | |
Oleg Nesterov | 3fe3d61 | 2013-06-20 19:38:09 +0200 | [diff] [blame] | 192 | /* |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 193 | * Enable trace_probe |
| 194 | * if the file is NULL, enable "perf" handler, or enable "trace" handler. |
| 195 | */ |
| 196 | static int |
| 197 | enable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file) |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 198 | { |
| 199 | int ret = 0; |
| 200 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 201 | if (file) { |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 202 | struct event_file_link *link; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 203 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 204 | link = kmalloc(sizeof(*link), GFP_KERNEL); |
| 205 | if (!link) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 206 | ret = -ENOMEM; |
Oleg Nesterov | 3fe3d61 | 2013-06-20 19:38:09 +0200 | [diff] [blame] | 207 | goto out; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 208 | } |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 209 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 210 | link->file = file; |
| 211 | list_add_tail_rcu(&link->list, &tp->files); |
| 212 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 213 | tp->flags |= TP_FLAG_TRACE; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 214 | } else |
| 215 | tp->flags |= TP_FLAG_PROFILE; |
| 216 | |
zhangwei(Jovi) | 195a84d | 2013-06-14 10:10:38 +0800 | [diff] [blame] | 217 | if (trace_probe_is_registered(tp) && !trace_probe_has_gone(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 218 | if (trace_probe_is_return(tp)) |
| 219 | ret = enable_kretprobe(&tp->rp); |
| 220 | else |
| 221 | ret = enable_kprobe(&tp->rp.kp); |
| 222 | } |
Oleg Nesterov | 3fe3d61 | 2013-06-20 19:38:09 +0200 | [diff] [blame] | 223 | out: |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 224 | return ret; |
| 225 | } |
| 226 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 227 | static struct event_file_link * |
| 228 | find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file) |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 229 | { |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 230 | struct event_file_link *link; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 231 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 232 | list_for_each_entry(link, &tp->files, list) |
| 233 | if (link->file == file) |
| 234 | return link; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 235 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 236 | return NULL; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Disable trace_probe |
| 241 | * if the file is NULL, disable "perf" handler, or disable "trace" handler. |
| 242 | */ |
| 243 | static int |
| 244 | disable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file) |
| 245 | { |
| 246 | int ret = 0; |
| 247 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 248 | if (file) { |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 249 | struct event_file_link *link; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 250 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 251 | link = find_event_file_link(tp, file); |
| 252 | if (!link) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 253 | ret = -EINVAL; |
Oleg Nesterov | 3fe3d61 | 2013-06-20 19:38:09 +0200 | [diff] [blame] | 254 | goto out; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 255 | } |
| 256 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 257 | list_del_rcu(&link->list); |
| 258 | /* synchronize with kprobe_trace_func/kretprobe_trace_func */ |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 259 | synchronize_sched(); |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 260 | kfree(link); |
| 261 | |
| 262 | if (!list_empty(&tp->files)) |
| 263 | goto out; |
| 264 | |
| 265 | tp->flags &= ~TP_FLAG_TRACE; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 266 | } else |
| 267 | tp->flags &= ~TP_FLAG_PROFILE; |
| 268 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 269 | if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 270 | if (trace_probe_is_return(tp)) |
| 271 | disable_kretprobe(&tp->rp); |
| 272 | else |
| 273 | disable_kprobe(&tp->rp.kp); |
| 274 | } |
Oleg Nesterov | 3fe3d61 | 2013-06-20 19:38:09 +0200 | [diff] [blame] | 275 | out: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 276 | return ret; |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 277 | } |
| 278 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 279 | /* Internal register function - just handle k*probes and flags */ |
| 280 | static int __register_trace_probe(struct trace_probe *tp) |
| 281 | { |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 282 | int i, ret; |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 283 | |
| 284 | if (trace_probe_is_registered(tp)) |
| 285 | return -EINVAL; |
| 286 | |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 287 | for (i = 0; i < tp->nr_args; i++) |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 288 | traceprobe_update_arg(&tp->args[i]); |
Masami Hiramatsu | 7f6878a | 2011-06-27 16:27:03 +0900 | [diff] [blame] | 289 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 290 | /* Set/clear disabled flag according to tp->flag */ |
| 291 | if (trace_probe_is_enabled(tp)) |
| 292 | tp->rp.kp.flags &= ~KPROBE_FLAG_DISABLED; |
| 293 | else |
| 294 | tp->rp.kp.flags |= KPROBE_FLAG_DISABLED; |
| 295 | |
| 296 | if (trace_probe_is_return(tp)) |
| 297 | ret = register_kretprobe(&tp->rp); |
| 298 | else |
| 299 | ret = register_kprobe(&tp->rp.kp); |
| 300 | |
| 301 | if (ret == 0) |
| 302 | tp->flags |= TP_FLAG_REGISTERED; |
| 303 | else { |
| 304 | pr_warning("Could not insert probe at %s+%lu: %d\n", |
| 305 | trace_probe_symbol(tp), trace_probe_offset(tp), ret); |
| 306 | if (ret == -ENOENT && trace_probe_is_on_module(tp)) { |
| 307 | pr_warning("This probe might be able to register after" |
| 308 | "target module is loaded. Continue.\n"); |
| 309 | ret = 0; |
| 310 | } else if (ret == -EILSEQ) { |
| 311 | pr_warning("Probing address(0x%p) is not an " |
| 312 | "instruction boundary.\n", |
| 313 | tp->rp.kp.addr); |
| 314 | ret = -EINVAL; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | return ret; |
| 319 | } |
| 320 | |
| 321 | /* Internal unregister function - just handle k*probes and flags */ |
| 322 | static void __unregister_trace_probe(struct trace_probe *tp) |
| 323 | { |
| 324 | if (trace_probe_is_registered(tp)) { |
| 325 | if (trace_probe_is_return(tp)) |
| 326 | unregister_kretprobe(&tp->rp); |
| 327 | else |
| 328 | unregister_kprobe(&tp->rp.kp); |
| 329 | tp->flags &= ~TP_FLAG_REGISTERED; |
| 330 | /* Cleanup kprobe for reuse */ |
| 331 | if (tp->rp.kp.symbol_name) |
| 332 | tp->rp.kp.addr = NULL; |
| 333 | } |
| 334 | } |
| 335 | |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 336 | /* Unregister a trace_probe and probe_event: call with locking probe_lock */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 337 | static int unregister_trace_probe(struct trace_probe *tp) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 338 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 339 | /* Enabled event can not be unregistered */ |
| 340 | if (trace_probe_is_enabled(tp)) |
| 341 | return -EBUSY; |
| 342 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 343 | __unregister_trace_probe(tp); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 344 | list_del(&tp->list); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 345 | unregister_probe_event(tp); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 346 | |
| 347 | return 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | /* Register a trace_probe and probe_event */ |
| 351 | static int register_trace_probe(struct trace_probe *tp) |
| 352 | { |
| 353 | struct trace_probe *old_tp; |
| 354 | int ret; |
| 355 | |
| 356 | mutex_lock(&probe_lock); |
| 357 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 358 | /* Delete old (same name) event if exist */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 359 | old_tp = find_trace_probe(tp->call.name, tp->call.class->system); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 360 | if (old_tp) { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 361 | ret = unregister_trace_probe(old_tp); |
| 362 | if (ret < 0) |
| 363 | goto end; |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 364 | free_trace_probe(old_tp); |
| 365 | } |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 366 | |
| 367 | /* Register new event */ |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 368 | ret = register_probe_event(tp); |
| 369 | if (ret) { |
Paul Bolle | 426d310 | 2010-08-07 12:30:03 +0200 | [diff] [blame] | 370 | pr_warning("Failed to register probe event(%d)\n", ret); |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 371 | goto end; |
| 372 | } |
| 373 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 374 | /* Register k*probe */ |
| 375 | ret = __register_trace_probe(tp); |
| 376 | if (ret < 0) |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 377 | unregister_probe_event(tp); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 378 | else |
Masami Hiramatsu | 2d5e067 | 2009-09-14 16:48:56 -0400 | [diff] [blame] | 379 | list_add_tail(&tp->list, &probe_list); |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 380 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 381 | end: |
| 382 | mutex_unlock(&probe_lock); |
| 383 | return ret; |
| 384 | } |
| 385 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 386 | /* Module notifier call back, checking event on the module */ |
| 387 | static int trace_probe_module_callback(struct notifier_block *nb, |
| 388 | unsigned long val, void *data) |
| 389 | { |
| 390 | struct module *mod = data; |
| 391 | struct trace_probe *tp; |
| 392 | int ret; |
| 393 | |
| 394 | if (val != MODULE_STATE_COMING) |
| 395 | return NOTIFY_DONE; |
| 396 | |
| 397 | /* Update probes on coming module */ |
| 398 | mutex_lock(&probe_lock); |
| 399 | list_for_each_entry(tp, &probe_list, list) { |
| 400 | if (trace_probe_within_module(tp, mod)) { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 401 | /* Don't need to check busy - this should have gone. */ |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 402 | __unregister_trace_probe(tp); |
| 403 | ret = __register_trace_probe(tp); |
| 404 | if (ret) |
| 405 | pr_warning("Failed to re-register probe %s on" |
| 406 | "%s: %d\n", |
| 407 | tp->call.name, mod->name, ret); |
| 408 | } |
| 409 | } |
| 410 | mutex_unlock(&probe_lock); |
| 411 | |
| 412 | return NOTIFY_DONE; |
| 413 | } |
| 414 | |
| 415 | static struct notifier_block trace_probe_module_nb = { |
| 416 | .notifier_call = trace_probe_module_callback, |
| 417 | .priority = 1 /* Invoked after kprobe module callback */ |
| 418 | }; |
| 419 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 420 | static int create_trace_probe(int argc, char **argv) |
| 421 | { |
| 422 | /* |
| 423 | * Argument syntax: |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 424 | * - Add kprobe: p[:[GRP/]EVENT] [MOD:]KSYM[+OFFS]|KADDR [FETCHARGS] |
| 425 | * - Add kretprobe: r[:[GRP/]EVENT] [MOD:]KSYM[+0] [FETCHARGS] |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 426 | * Fetch args: |
Masami Hiramatsu | 2e06ff6 | 2009-10-07 18:27:59 -0400 | [diff] [blame] | 427 | * $retval : fetch return value |
| 428 | * $stack : fetch stack address |
| 429 | * $stackN : fetch Nth of stack (N:0-) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 430 | * @ADDR : fetch memory at ADDR (ADDR should be in kernel) |
| 431 | * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) |
| 432 | * %REG : fetch register REG |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 433 | * Dereferencing memory fetch: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 434 | * +|-offs(ARG) : fetch memory at ARG +|- offs address. |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 435 | * Alias name of args: |
| 436 | * NAME=FETCHARG : set NAME as alias of FETCHARG. |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 437 | * Type of args: |
| 438 | * FETCHARG:TYPE : use TYPE instead of unsigned long. |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 439 | */ |
| 440 | struct trace_probe *tp; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 441 | int i, ret = 0; |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 442 | bool is_return = false, is_delete = false; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 443 | char *symbol = NULL, *event = NULL, *group = NULL; |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 444 | char *arg; |
Masami Hiramatsu | 2fba0c8 | 2009-09-10 19:53:14 -0400 | [diff] [blame] | 445 | unsigned long offset = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 446 | void *addr = NULL; |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 447 | char buf[MAX_EVENT_NAME_LEN]; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 448 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 449 | /* argc must be >= 1 */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 450 | if (argv[0][0] == 'p') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 451 | is_return = false; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 452 | else if (argv[0][0] == 'r') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 453 | is_return = true; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 454 | else if (argv[0][0] == '-') |
Srikar Dronamraju | 3a6b766 | 2012-04-09 14:41:33 +0530 | [diff] [blame] | 455 | is_delete = true; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 456 | else { |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 457 | pr_info("Probe definition must be started with 'p', 'r' or" |
| 458 | " '-'.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 459 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 460 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 461 | |
| 462 | if (argv[0][1] == ':') { |
| 463 | event = &argv[0][2]; |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 464 | if (strchr(event, '/')) { |
| 465 | group = event; |
| 466 | event = strchr(group, '/') + 1; |
| 467 | event[-1] = '\0'; |
| 468 | if (strlen(group) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 469 | pr_info("Group name is not specified\n"); |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 470 | return -EINVAL; |
| 471 | } |
| 472 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 473 | if (strlen(event) == 0) { |
Wenji Huang | a5efd92 | 2010-02-24 15:40:23 +0800 | [diff] [blame] | 474 | pr_info("Event name is not specified\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 475 | return -EINVAL; |
| 476 | } |
| 477 | } |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 478 | if (!group) |
| 479 | group = KPROBE_EVENT_SYSTEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 480 | |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 481 | if (is_delete) { |
| 482 | if (!event) { |
| 483 | pr_info("Delete command needs an event name.\n"); |
| 484 | return -EINVAL; |
| 485 | } |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 486 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 487 | tp = find_trace_probe(event, group); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 488 | if (!tp) { |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 489 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 490 | pr_info("Event %s/%s doesn't exist.\n", group, event); |
| 491 | return -ENOENT; |
| 492 | } |
| 493 | /* delete an event */ |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 494 | ret = unregister_trace_probe(tp); |
| 495 | if (ret == 0) |
| 496 | free_trace_probe(tp); |
Srikar Dronamraju | 9da79ab | 2010-06-30 14:15:48 +0530 | [diff] [blame] | 497 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 498 | return ret; |
Masami Hiramatsu | a7c312b | 2009-12-08 17:03:16 -0500 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | if (argc < 2) { |
| 502 | pr_info("Probe point is not specified.\n"); |
| 503 | return -EINVAL; |
| 504 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 505 | if (isdigit(argv[1][0])) { |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 506 | if (is_return) { |
| 507 | pr_info("Return probe point must be a symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 508 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 509 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 510 | /* an address specified */ |
Daniel Walter | bcd83ea | 2012-09-26 22:08:38 +0200 | [diff] [blame] | 511 | ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 512 | if (ret) { |
| 513 | pr_info("Failed to parse address.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 514 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 515 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 516 | } else { |
| 517 | /* a symbol specified */ |
| 518 | symbol = argv[1]; |
| 519 | /* TODO: support .init module functions */ |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 520 | ret = traceprobe_split_symbol_offset(symbol, &offset); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 521 | if (ret) { |
| 522 | pr_info("Failed to parse symbol.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 523 | return ret; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 524 | } |
| 525 | if (offset && is_return) { |
| 526 | pr_info("Return probe must be used without offset.\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 527 | return -EINVAL; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 528 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 529 | } |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 530 | argc -= 2; argv += 2; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 531 | |
| 532 | /* setup a probe */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 533 | if (!event) { |
| 534 | /* Make a new event name */ |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 535 | if (symbol) |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 536 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 537 | is_return ? 'r' : 'p', symbol, offset); |
| 538 | else |
Masami Hiramatsu | 6f3cf44 | 2009-12-16 17:24:08 -0500 | [diff] [blame] | 539 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 540 | is_return ? 'r' : 'p', addr); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 541 | event = buf; |
| 542 | } |
Masami Hiramatsu | f52487e | 2009-09-10 19:53:53 -0400 | [diff] [blame] | 543 | tp = alloc_trace_probe(group, event, addr, symbol, offset, argc, |
| 544 | is_return); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 545 | if (IS_ERR(tp)) { |
| 546 | pr_info("Failed to allocate trace_probe.(%d)\n", |
| 547 | (int)PTR_ERR(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 548 | return PTR_ERR(tp); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 549 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 550 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 551 | /* parse arguments */ |
Masami Hiramatsu | a82378d | 2009-08-13 16:35:18 -0400 | [diff] [blame] | 552 | ret = 0; |
| 553 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
Masami Hiramatsu | 61a5273 | 2010-08-27 20:38:46 +0900 | [diff] [blame] | 554 | /* Increment count for freeing args in error case */ |
| 555 | tp->nr_args++; |
| 556 | |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 557 | /* Parse argument name */ |
| 558 | arg = strchr(argv[i], '='); |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 559 | if (arg) { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 560 | *arg++ = '\0'; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 561 | tp->args[i].name = kstrdup(argv[i], GFP_KERNEL); |
| 562 | } else { |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 563 | arg = argv[i]; |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 564 | /* If argument name is omitted, set "argN" */ |
| 565 | snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1); |
| 566 | tp->args[i].name = kstrdup(buf, GFP_KERNEL); |
| 567 | } |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 568 | |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 569 | if (!tp->args[i].name) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 570 | pr_info("Failed to allocate argument[%d] name.\n", i); |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 571 | ret = -ENOMEM; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 572 | goto error; |
| 573 | } |
Masami Hiramatsu | da34634 | 2010-08-27 20:39:12 +0900 | [diff] [blame] | 574 | |
| 575 | if (!is_good_name(tp->args[i].name)) { |
| 576 | pr_info("Invalid argument[%d] name: %s\n", |
| 577 | i, tp->args[i].name); |
| 578 | ret = -EINVAL; |
| 579 | goto error; |
| 580 | } |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 581 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 582 | if (traceprobe_conflict_field_name(tp->args[i].name, |
| 583 | tp->args, i)) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 584 | pr_info("Argument[%d] name '%s' conflicts with " |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 585 | "another field.\n", i, argv[i]); |
| 586 | ret = -EINVAL; |
| 587 | goto error; |
| 588 | } |
Masami Hiramatsu | ba8665d | 2009-11-30 19:19:20 -0500 | [diff] [blame] | 589 | |
| 590 | /* Parse fetch argument */ |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 591 | ret = traceprobe_parse_probe_arg(arg, &tp->size, &tp->args[i], |
Srikar Dronamraju | f3f096c | 2012-04-11 16:00:43 +0530 | [diff] [blame] | 592 | is_return, true); |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 593 | if (ret) { |
Masami Hiramatsu | aba9159 | 2010-08-27 20:39:06 +0900 | [diff] [blame] | 594 | pr_info("Parse error at argument[%d]. (%d)\n", i, ret); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 595 | goto error; |
Masami Hiramatsu | e63cc23 | 2009-10-16 20:07:28 -0400 | [diff] [blame] | 596 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 597 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 598 | |
| 599 | ret = register_trace_probe(tp); |
| 600 | if (ret) |
| 601 | goto error; |
| 602 | return 0; |
| 603 | |
| 604 | error: |
| 605 | free_trace_probe(tp); |
| 606 | return ret; |
| 607 | } |
| 608 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 609 | static int release_all_trace_probes(void) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 610 | { |
| 611 | struct trace_probe *tp; |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 612 | int ret = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 613 | |
| 614 | mutex_lock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 615 | /* Ensure no probe is in use. */ |
| 616 | list_for_each_entry(tp, &probe_list, list) |
| 617 | if (trace_probe_is_enabled(tp)) { |
| 618 | ret = -EBUSY; |
| 619 | goto end; |
| 620 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 621 | /* TODO: Use batch unregistration */ |
| 622 | while (!list_empty(&probe_list)) { |
| 623 | tp = list_entry(probe_list.next, struct trace_probe, list); |
| 624 | unregister_trace_probe(tp); |
| 625 | free_trace_probe(tp); |
| 626 | } |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 627 | |
| 628 | end: |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 629 | mutex_unlock(&probe_lock); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 630 | |
| 631 | return ret; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 632 | } |
| 633 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 634 | /* Probes listing interfaces */ |
| 635 | static void *probes_seq_start(struct seq_file *m, loff_t *pos) |
| 636 | { |
| 637 | mutex_lock(&probe_lock); |
| 638 | return seq_list_start(&probe_list, *pos); |
| 639 | } |
| 640 | |
| 641 | static void *probes_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| 642 | { |
| 643 | return seq_list_next(v, &probe_list, pos); |
| 644 | } |
| 645 | |
| 646 | static void probes_seq_stop(struct seq_file *m, void *v) |
| 647 | { |
| 648 | mutex_unlock(&probe_lock); |
| 649 | } |
| 650 | |
| 651 | static int probes_seq_show(struct seq_file *m, void *v) |
| 652 | { |
| 653 | struct trace_probe *tp = v; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 654 | int i; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 655 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 656 | seq_printf(m, "%c", trace_probe_is_return(tp) ? 'r' : 'p'); |
Steven Rostedt | 8f08201 | 2010-04-20 10:47:33 -0400 | [diff] [blame] | 657 | seq_printf(m, ":%s/%s", tp->call.class->system, tp->call.name); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 658 | |
Lai Jiangshan | 52a11f3 | 2009-11-25 16:33:15 +0800 | [diff] [blame] | 659 | if (!tp->symbol) |
| 660 | seq_printf(m, " 0x%p", tp->rp.kp.addr); |
| 661 | else if (tp->rp.kp.offset) |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 662 | seq_printf(m, " %s+%u", trace_probe_symbol(tp), |
| 663 | tp->rp.kp.offset); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 664 | else |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 665 | seq_printf(m, " %s", trace_probe_symbol(tp)); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 666 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 667 | for (i = 0; i < tp->nr_args; i++) |
| 668 | 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] | 669 | seq_printf(m, "\n"); |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 670 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 671 | return 0; |
| 672 | } |
| 673 | |
| 674 | static const struct seq_operations probes_seq_op = { |
| 675 | .start = probes_seq_start, |
| 676 | .next = probes_seq_next, |
| 677 | .stop = probes_seq_stop, |
| 678 | .show = probes_seq_show |
| 679 | }; |
| 680 | |
| 681 | static int probes_open(struct inode *inode, struct file *file) |
| 682 | { |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 683 | int ret; |
| 684 | |
| 685 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
| 686 | ret = release_all_trace_probes(); |
| 687 | if (ret < 0) |
| 688 | return ret; |
| 689 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 690 | |
| 691 | return seq_open(file, &probes_seq_op); |
| 692 | } |
| 693 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 694 | static ssize_t probes_write(struct file *file, const char __user *buffer, |
| 695 | size_t count, loff_t *ppos) |
| 696 | { |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 697 | return traceprobe_probes_write(file, buffer, count, ppos, |
| 698 | create_trace_probe); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 699 | } |
| 700 | |
| 701 | static const struct file_operations kprobe_events_ops = { |
| 702 | .owner = THIS_MODULE, |
| 703 | .open = probes_open, |
| 704 | .read = seq_read, |
| 705 | .llseek = seq_lseek, |
| 706 | .release = seq_release, |
| 707 | .write = probes_write, |
| 708 | }; |
| 709 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 710 | /* Probes profiling interfaces */ |
| 711 | static int probes_profile_seq_show(struct seq_file *m, void *v) |
| 712 | { |
| 713 | struct trace_probe *tp = v; |
| 714 | |
| 715 | seq_printf(m, " %-44s %15lu %15lu\n", tp->call.name, tp->nhit, |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 716 | tp->rp.kp.nmissed); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | static const struct seq_operations profile_seq_op = { |
| 722 | .start = probes_seq_start, |
| 723 | .next = probes_seq_next, |
| 724 | .stop = probes_seq_stop, |
| 725 | .show = probes_profile_seq_show |
| 726 | }; |
| 727 | |
| 728 | static int profile_open(struct inode *inode, struct file *file) |
| 729 | { |
| 730 | return seq_open(file, &profile_seq_op); |
| 731 | } |
| 732 | |
| 733 | static const struct file_operations kprobe_profile_ops = { |
| 734 | .owner = THIS_MODULE, |
| 735 | .open = profile_open, |
| 736 | .read = seq_read, |
| 737 | .llseek = seq_lseek, |
| 738 | .release = seq_release, |
| 739 | }; |
| 740 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 741 | /* Sum up total data length for dynamic arraies (strings) */ |
| 742 | static __kprobes int __get_data_size(struct trace_probe *tp, |
| 743 | struct pt_regs *regs) |
| 744 | { |
| 745 | int i, ret = 0; |
| 746 | u32 len; |
| 747 | |
| 748 | for (i = 0; i < tp->nr_args; i++) |
| 749 | if (unlikely(tp->args[i].fetch_size.fn)) { |
| 750 | call_fetch(&tp->args[i].fetch_size, regs, &len); |
| 751 | ret += len; |
| 752 | } |
| 753 | |
| 754 | return ret; |
| 755 | } |
| 756 | |
| 757 | /* Store the value of each argument */ |
| 758 | static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp, |
| 759 | struct pt_regs *regs, |
| 760 | u8 *data, int maxlen) |
| 761 | { |
| 762 | int i; |
| 763 | u32 end = tp->size; |
| 764 | u32 *dl; /* Data (relative) location */ |
| 765 | |
| 766 | for (i = 0; i < tp->nr_args; i++) { |
| 767 | if (unlikely(tp->args[i].fetch_size.fn)) { |
| 768 | /* |
| 769 | * First, we set the relative location and |
| 770 | * maximum data length to *dl |
| 771 | */ |
| 772 | dl = (u32 *)(data + tp->args[i].offset); |
| 773 | *dl = make_data_rloc(maxlen, end - tp->args[i].offset); |
| 774 | /* Then try to fetch string or dynamic array data */ |
| 775 | call_fetch(&tp->args[i].fetch, regs, dl); |
| 776 | /* Reduce maximum length */ |
| 777 | end += get_rloc_len(*dl); |
| 778 | maxlen -= get_rloc_len(*dl); |
| 779 | /* Trick here, convert data_rloc to data_loc */ |
| 780 | *dl = convert_rloc_to_loc(*dl, |
| 781 | ent_size + tp->args[i].offset); |
| 782 | } else |
| 783 | /* Just fetching data normally */ |
| 784 | call_fetch(&tp->args[i].fetch, regs, |
| 785 | data + tp->args[i].offset); |
| 786 | } |
| 787 | } |
| 788 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 789 | /* Kprobe handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 790 | static __kprobes void |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 791 | __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs, |
| 792 | struct ftrace_event_file *ftrace_file) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 793 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 794 | struct kprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 795 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 796 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 797 | int size, dsize, pc; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 798 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 799 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 800 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 801 | WARN_ON(call != ftrace_file->event_call); |
| 802 | |
Masami Hiramatsu | b882008 | 2013-05-09 14:44:54 +0900 | [diff] [blame] | 803 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
| 804 | return; |
| 805 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 806 | local_save_flags(irq_flags); |
| 807 | pc = preempt_count(); |
| 808 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 809 | dsize = __get_data_size(tp, regs); |
| 810 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 811 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 812 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
| 813 | call->event.type, |
| 814 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 815 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 816 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 817 | |
| 818 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 819 | entry->ip = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 820 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 821 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 822 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Steven Rostedt | 0d5c6e1 | 2012-11-01 20:54:21 -0400 | [diff] [blame] | 823 | trace_buffer_unlock_commit_regs(buffer, event, |
| 824 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 825 | } |
| 826 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 827 | static __kprobes void |
| 828 | kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs) |
| 829 | { |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 830 | struct event_file_link *link; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 831 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 832 | list_for_each_entry_rcu(link, &tp->files, list) |
| 833 | __kprobe_trace_func(tp, regs, link->file); |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 834 | } |
| 835 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 836 | /* Kretprobe handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 837 | static __kprobes void |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 838 | __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri, |
| 839 | struct pt_regs *regs, |
| 840 | struct ftrace_event_file *ftrace_file) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 841 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 842 | struct kretprobe_trace_entry_head *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 843 | struct ring_buffer_event *event; |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 844 | struct ring_buffer *buffer; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 845 | int size, pc, dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 846 | unsigned long irq_flags; |
Masami Hiramatsu | 4263565 | 2009-08-13 16:35:26 -0400 | [diff] [blame] | 847 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 848 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 849 | WARN_ON(call != ftrace_file->event_call); |
| 850 | |
Masami Hiramatsu | b882008 | 2013-05-09 14:44:54 +0900 | [diff] [blame] | 851 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) |
| 852 | return; |
| 853 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 854 | local_save_flags(irq_flags); |
| 855 | pc = preempt_count(); |
| 856 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 857 | dsize = __get_data_size(tp, regs); |
| 858 | size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 859 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 860 | event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, |
| 861 | call->event.type, |
| 862 | size, irq_flags, pc); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 863 | if (!event) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 864 | return; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 865 | |
| 866 | entry = ring_buffer_event_data(event); |
Masami Hiramatsu | 4a846b4 | 2009-09-11 05:31:21 +0200 | [diff] [blame] | 867 | entry->func = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 868 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 869 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 870 | |
Frederic Weisbecker | 8f8ffe2 | 2009-09-11 01:09:23 +0200 | [diff] [blame] | 871 | if (!filter_current_check_discard(buffer, call, entry, event)) |
Steven Rostedt | 0d5c6e1 | 2012-11-01 20:54:21 -0400 | [diff] [blame] | 872 | trace_buffer_unlock_commit_regs(buffer, event, |
| 873 | irq_flags, pc, regs); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 874 | } |
| 875 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 876 | static __kprobes void |
| 877 | kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri, |
| 878 | struct pt_regs *regs) |
| 879 | { |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 880 | struct event_file_link *link; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 881 | |
Oleg Nesterov | b04d52e | 2013-06-20 19:38:14 +0200 | [diff] [blame^] | 882 | list_for_each_entry_rcu(link, &tp->files, list) |
| 883 | __kretprobe_trace_func(tp, ri, regs, link->file); |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 884 | } |
| 885 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 886 | /* Event entry printers */ |
Masami Hiramatsu | b62fdd9 | 2013-05-13 20:58:39 +0900 | [diff] [blame] | 887 | static enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 888 | print_kprobe_event(struct trace_iterator *iter, int flags, |
| 889 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 890 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 891 | struct kprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 892 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 893 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 894 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 895 | int i; |
| 896 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 897 | field = (struct kprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 898 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 899 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 900 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 901 | goto partial; |
| 902 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 903 | if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 904 | goto partial; |
| 905 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 906 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 907 | goto partial; |
| 908 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 909 | data = (u8 *)&field[1]; |
| 910 | for (i = 0; i < tp->nr_args; i++) |
| 911 | if (!tp->args[i].type->print(s, tp->args[i].name, |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 912 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 913 | goto partial; |
| 914 | |
| 915 | if (!trace_seq_puts(s, "\n")) |
| 916 | goto partial; |
| 917 | |
| 918 | return TRACE_TYPE_HANDLED; |
| 919 | partial: |
| 920 | return TRACE_TYPE_PARTIAL_LINE; |
| 921 | } |
| 922 | |
Masami Hiramatsu | b62fdd9 | 2013-05-13 20:58:39 +0900 | [diff] [blame] | 923 | static enum print_line_t |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 924 | print_kretprobe_event(struct trace_iterator *iter, int flags, |
| 925 | struct trace_event *event) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 926 | { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 927 | struct kretprobe_trace_entry_head *field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 928 | struct trace_seq *s = &iter->seq; |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 929 | struct trace_probe *tp; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 930 | u8 *data; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 931 | int i; |
| 932 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 933 | field = (struct kretprobe_trace_entry_head *)iter->ent; |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 934 | tp = container_of(event, struct trace_probe, call.event); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 935 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 936 | if (!trace_seq_printf(s, "%s: (", tp->call.name)) |
| 937 | goto partial; |
| 938 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 939 | if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) |
| 940 | goto partial; |
| 941 | |
| 942 | if (!trace_seq_puts(s, " <- ")) |
| 943 | goto partial; |
| 944 | |
| 945 | if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) |
| 946 | goto partial; |
| 947 | |
Masami Hiramatsu | 6e9f23d | 2009-09-10 19:53:45 -0400 | [diff] [blame] | 948 | if (!trace_seq_puts(s, ")")) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 949 | goto partial; |
| 950 | |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 951 | data = (u8 *)&field[1]; |
| 952 | for (i = 0; i < tp->nr_args; i++) |
| 953 | if (!tp->args[i].type->print(s, tp->args[i].name, |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 954 | data + tp->args[i].offset, field)) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 955 | goto partial; |
| 956 | |
| 957 | if (!trace_seq_puts(s, "\n")) |
| 958 | goto partial; |
| 959 | |
| 960 | return TRACE_TYPE_HANDLED; |
| 961 | partial: |
| 962 | return TRACE_TYPE_PARTIAL_LINE; |
| 963 | } |
| 964 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 965 | |
| 966 | static int kprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 967 | { |
| 968 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 969 | struct kprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 970 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 971 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 972 | DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 973 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 974 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 975 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 976 | tp->args[i].name, |
| 977 | sizeof(field) + tp->args[i].offset, |
| 978 | tp->args[i].type->size, |
| 979 | tp->args[i].type->is_signed, |
| 980 | FILTER_OTHER); |
| 981 | if (ret) |
| 982 | return ret; |
| 983 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 984 | return 0; |
| 985 | } |
| 986 | |
| 987 | static int kretprobe_event_define_fields(struct ftrace_event_call *event_call) |
| 988 | { |
| 989 | int ret, i; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 990 | struct kretprobe_trace_entry_head field; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 991 | struct trace_probe *tp = (struct trace_probe *)event_call->data; |
| 992 | |
Masami Hiramatsu | a703d94 | 2009-10-07 18:28:07 -0400 | [diff] [blame] | 993 | DEFINE_FIELD(unsigned long, func, FIELD_STRING_FUNC, 0); |
| 994 | DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0); |
Masami Hiramatsu | eca0d91 | 2009-09-10 19:53:38 -0400 | [diff] [blame] | 995 | /* Set argument names as fields */ |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 996 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 997 | ret = trace_define_field(event_call, tp->args[i].type->fmttype, |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 998 | tp->args[i].name, |
| 999 | sizeof(field) + tp->args[i].offset, |
| 1000 | tp->args[i].type->size, |
| 1001 | tp->args[i].type->is_signed, |
| 1002 | FILTER_OTHER); |
| 1003 | if (ret) |
| 1004 | return ret; |
| 1005 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1006 | return 0; |
| 1007 | } |
| 1008 | |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1009 | static int __set_print_fmt(struct trace_probe *tp, char *buf, int len) |
| 1010 | { |
| 1011 | int i; |
| 1012 | int pos = 0; |
| 1013 | |
| 1014 | const char *fmt, *arg; |
| 1015 | |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1016 | if (!trace_probe_is_return(tp)) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1017 | fmt = "(%lx)"; |
| 1018 | arg = "REC->" FIELD_STRING_IP; |
| 1019 | } else { |
| 1020 | fmt = "(%lx <- %lx)"; |
| 1021 | arg = "REC->" FIELD_STRING_FUNC ", REC->" FIELD_STRING_RETIP; |
| 1022 | } |
| 1023 | |
| 1024 | /* When len=0, we just calculate the needed length */ |
| 1025 | #define LEN_OR_ZERO (len ? len - pos : 0) |
| 1026 | |
| 1027 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\"%s", fmt); |
| 1028 | |
| 1029 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1030 | pos += snprintf(buf + pos, LEN_OR_ZERO, " %s=%s", |
| 1031 | tp->args[i].name, tp->args[i].type->fmt); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1032 | } |
| 1033 | |
| 1034 | pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg); |
| 1035 | |
| 1036 | for (i = 0; i < tp->nr_args; i++) { |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1037 | if (strcmp(tp->args[i].type->name, "string") == 0) |
| 1038 | pos += snprintf(buf + pos, LEN_OR_ZERO, |
| 1039 | ", __get_str(%s)", |
| 1040 | tp->args[i].name); |
| 1041 | else |
| 1042 | pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s", |
| 1043 | tp->args[i].name); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1044 | } |
| 1045 | |
| 1046 | #undef LEN_OR_ZERO |
| 1047 | |
| 1048 | /* return the length of print_fmt */ |
| 1049 | return pos; |
| 1050 | } |
| 1051 | |
| 1052 | static int set_print_fmt(struct trace_probe *tp) |
| 1053 | { |
| 1054 | int len; |
| 1055 | char *print_fmt; |
| 1056 | |
| 1057 | /* First: called with 0 length to calculate the needed length */ |
| 1058 | len = __set_print_fmt(tp, NULL, 0); |
| 1059 | print_fmt = kmalloc(len + 1, GFP_KERNEL); |
| 1060 | if (!print_fmt) |
| 1061 | return -ENOMEM; |
| 1062 | |
| 1063 | /* Second: actually write the @print_fmt */ |
| 1064 | __set_print_fmt(tp, print_fmt, len + 1); |
| 1065 | tp->call.print_fmt = print_fmt; |
| 1066 | |
| 1067 | return 0; |
| 1068 | } |
| 1069 | |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1070 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1071 | |
| 1072 | /* Kprobe profile handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1073 | static __kprobes void |
| 1074 | kprobe_perf_func(struct trace_probe *tp, struct pt_regs *regs) |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1075 | { |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1076 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1077 | struct kprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1078 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1079 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1080 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1081 | |
Oleg Nesterov | 288e984 | 2013-06-20 19:38:06 +0200 | [diff] [blame] | 1082 | head = this_cpu_ptr(call->perf_events); |
| 1083 | if (hlist_empty(head)) |
| 1084 | return; |
| 1085 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1086 | dsize = __get_data_size(tp, regs); |
| 1087 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1088 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1089 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1090 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1091 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1092 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1093 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 1094 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 1095 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1096 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1097 | |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1098 | entry->ip = (unsigned long)tp->rp.kp.addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1099 | memset(&entry[1], 0, dsize); |
| 1100 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 1101 | perf_trace_buf_submit(entry, size, rctx, |
| 1102 | entry->ip, 1, regs, head, NULL); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1103 | } |
| 1104 | |
| 1105 | /* Kretprobe profile handler */ |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1106 | static __kprobes void |
| 1107 | kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri, |
| 1108 | struct pt_regs *regs) |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1109 | { |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1110 | struct ftrace_event_call *call = &tp->call; |
Masami Hiramatsu | 93ccae7 | 2010-04-12 13:17:08 -0400 | [diff] [blame] | 1111 | struct kretprobe_trace_entry_head *entry; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 1112 | struct hlist_head *head; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1113 | int size, __size, dsize; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 1114 | int rctx; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1115 | |
Oleg Nesterov | 288e984 | 2013-06-20 19:38:06 +0200 | [diff] [blame] | 1116 | head = this_cpu_ptr(call->perf_events); |
| 1117 | if (hlist_empty(head)) |
| 1118 | return; |
| 1119 | |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1120 | dsize = __get_data_size(tp, regs); |
| 1121 | __size = sizeof(*entry) + tp->size + dsize; |
Masami Hiramatsu | 74ebb63 | 2009-09-14 16:49:28 -0400 | [diff] [blame] | 1122 | size = ALIGN(__size + sizeof(u32), sizeof(u64)); |
| 1123 | size -= sizeof(u32); |
Frederic Weisbecker | 97d5a22 | 2010-03-05 05:35:37 +0100 | [diff] [blame] | 1124 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1125 | "profile buffer not large enough")) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1126 | return; |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1127 | |
Steven Rostedt | ff5f149 | 2010-05-21 11:49:57 -0400 | [diff] [blame] | 1128 | entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx); |
Xiao Guangrong | 430ad5a | 2010-01-28 09:32:29 +0800 | [diff] [blame] | 1129 | if (!entry) |
Xiao Guangrong | 1e12a4a | 2010-01-28 09:34:27 +0800 | [diff] [blame] | 1130 | return; |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 1131 | |
Masami Hiramatsu | a1a138d | 2009-09-25 11:20:12 -0700 | [diff] [blame] | 1132 | entry->func = (unsigned long)tp->rp.kp.addr; |
| 1133 | entry->ret_ip = (unsigned long)ri->ret_addr; |
Masami Hiramatsu | e09c861 | 2010-07-05 15:54:45 -0300 | [diff] [blame] | 1134 | store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize); |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 1135 | perf_trace_buf_submit(entry, size, rctx, |
| 1136 | entry->ret_ip, 1, regs, head, NULL); |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1137 | } |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1138 | #endif /* CONFIG_PERF_EVENTS */ |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1139 | |
Oleg Nesterov | 3fe3d61 | 2013-06-20 19:38:09 +0200 | [diff] [blame] | 1140 | /* |
| 1141 | * called by perf_trace_init() or __ftrace_set_clr_event() under event_mutex. |
| 1142 | * |
| 1143 | * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe |
| 1144 | * lockless, but we can't race with this __init function. |
| 1145 | */ |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1146 | static __kprobes |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1147 | int kprobe_register(struct ftrace_event_call *event, |
| 1148 | enum trace_reg type, void *data) |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1149 | { |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1150 | struct trace_probe *tp = (struct trace_probe *)event->data; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1151 | struct ftrace_event_file *file = data; |
Masami Hiramatsu | 1538f88 | 2011-06-27 16:26:44 +0900 | [diff] [blame] | 1152 | |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1153 | switch (type) { |
| 1154 | case TRACE_REG_REGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1155 | return enable_trace_probe(tp, file); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1156 | case TRACE_REG_UNREGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1157 | return disable_trace_probe(tp, file); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1158 | |
| 1159 | #ifdef CONFIG_PERF_EVENTS |
| 1160 | case TRACE_REG_PERF_REGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1161 | return enable_trace_probe(tp, NULL); |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1162 | case TRACE_REG_PERF_UNREGISTER: |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1163 | return disable_trace_probe(tp, NULL); |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1164 | case TRACE_REG_PERF_OPEN: |
| 1165 | case TRACE_REG_PERF_CLOSE: |
Jiri Olsa | 489c75c | 2012-02-15 15:51:50 +0100 | [diff] [blame] | 1166 | case TRACE_REG_PERF_ADD: |
| 1167 | case TRACE_REG_PERF_DEL: |
Jiri Olsa | ceec0b6 | 2012-02-15 15:51:49 +0100 | [diff] [blame] | 1168 | return 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1169 | #endif |
| 1170 | } |
| 1171 | return 0; |
| 1172 | } |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1173 | |
| 1174 | static __kprobes |
| 1175 | int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs) |
| 1176 | { |
| 1177 | struct trace_probe *tp = container_of(kp, struct trace_probe, rp.kp); |
| 1178 | |
Masami Hiramatsu | 48182bd | 2013-05-09 14:44:36 +0900 | [diff] [blame] | 1179 | tp->nhit++; |
| 1180 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1181 | if (tp->flags & TP_FLAG_TRACE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1182 | kprobe_trace_func(tp, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1183 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1184 | if (tp->flags & TP_FLAG_PROFILE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1185 | kprobe_perf_func(tp, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1186 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1187 | return 0; /* We don't tweek kernel, so just return 0 */ |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1188 | } |
| 1189 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1190 | static __kprobes |
| 1191 | int kretprobe_dispatcher(struct kretprobe_instance *ri, struct pt_regs *regs) |
| 1192 | { |
| 1193 | struct trace_probe *tp = container_of(ri->rp, struct trace_probe, rp); |
| 1194 | |
Masami Hiramatsu | 48182bd | 2013-05-09 14:44:36 +0900 | [diff] [blame] | 1195 | tp->nhit++; |
| 1196 | |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1197 | if (tp->flags & TP_FLAG_TRACE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1198 | kretprobe_trace_func(tp, ri, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1199 | #ifdef CONFIG_PERF_EVENTS |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1200 | if (tp->flags & TP_FLAG_PROFILE) |
Masami Hiramatsu | 2b106aa | 2013-05-09 14:44:41 +0900 | [diff] [blame] | 1201 | kretprobe_perf_func(tp, ri, regs); |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 1202 | #endif |
Masami Hiramatsu | 50d7805 | 2009-09-14 16:49:20 -0400 | [diff] [blame] | 1203 | return 0; /* We don't tweek kernel, so just return 0 */ |
| 1204 | } |
Masami Hiramatsu | e08d1c6 | 2009-09-10 19:53:30 -0400 | [diff] [blame] | 1205 | |
Steven Rostedt | a9a5776 | 2010-04-22 18:46:14 -0400 | [diff] [blame] | 1206 | static struct trace_event_functions kretprobe_funcs = { |
| 1207 | .trace = print_kretprobe_event |
| 1208 | }; |
| 1209 | |
| 1210 | static struct trace_event_functions kprobe_funcs = { |
| 1211 | .trace = print_kprobe_event |
| 1212 | }; |
| 1213 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1214 | static int register_probe_event(struct trace_probe *tp) |
| 1215 | { |
| 1216 | struct ftrace_event_call *call = &tp->call; |
| 1217 | int ret; |
| 1218 | |
| 1219 | /* Initialize ftrace_event_call */ |
Li Zefan | ffb9f99 | 2010-05-24 16:24:52 +0800 | [diff] [blame] | 1220 | INIT_LIST_HEAD(&call->class->fields); |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1221 | if (trace_probe_is_return(tp)) { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1222 | call->event.funcs = &kretprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1223 | call->class->define_fields = kretprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1224 | } else { |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1225 | call->event.funcs = &kprobe_funcs; |
Steven Rostedt | 2e33af0 | 2010-04-22 10:35:55 -0400 | [diff] [blame] | 1226 | call->class->define_fields = kprobe_event_define_fields; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1227 | } |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1228 | if (set_print_fmt(tp) < 0) |
| 1229 | return -ENOMEM; |
Steven Rostedt | 32c0eda | 2010-04-23 10:38:03 -0400 | [diff] [blame] | 1230 | ret = register_ftrace_event(&call->event); |
| 1231 | if (!ret) { |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1232 | kfree(call->print_fmt); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1233 | return -ENODEV; |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1234 | } |
Steven Rostedt | 553552c | 2010-04-23 11:12:36 -0400 | [diff] [blame] | 1235 | call->flags = 0; |
Steven Rostedt | 2239291 | 2010-04-21 12:27:06 -0400 | [diff] [blame] | 1236 | call->class->reg = kprobe_register; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1237 | call->data = tp; |
| 1238 | ret = trace_add_event_call(call); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1239 | if (ret) { |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1240 | pr_info("Failed to register kprobe event: %s\n", call->name); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1241 | kfree(call->print_fmt); |
Steven Rostedt | 80decc7 | 2010-04-23 10:00:22 -0400 | [diff] [blame] | 1242 | unregister_ftrace_event(&call->event); |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1243 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1244 | return ret; |
| 1245 | } |
| 1246 | |
| 1247 | static void unregister_probe_event(struct trace_probe *tp) |
| 1248 | { |
Masami Hiramatsu | ff50d99 | 2009-08-13 16:35:34 -0400 | [diff] [blame] | 1249 | /* tp->event is unregistered in trace_remove_event_call() */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1250 | trace_remove_event_call(&tp->call); |
Lai Jiangshan | a342a028 | 2009-12-15 15:39:49 +0800 | [diff] [blame] | 1251 | kfree(tp->call.print_fmt); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1252 | } |
| 1253 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1254 | /* Make a debugfs interface for controlling probe points */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1255 | static __init int init_kprobe_trace(void) |
| 1256 | { |
| 1257 | struct dentry *d_tracer; |
| 1258 | struct dentry *entry; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1259 | |
Masami Hiramatsu | 6142431 | 2011-06-27 16:26:56 +0900 | [diff] [blame] | 1260 | if (register_module_notifier(&trace_probe_module_nb)) |
| 1261 | return -EINVAL; |
| 1262 | |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1263 | d_tracer = tracing_init_dentry(); |
| 1264 | if (!d_tracer) |
| 1265 | return 0; |
| 1266 | |
| 1267 | entry = debugfs_create_file("kprobe_events", 0644, d_tracer, |
| 1268 | NULL, &kprobe_events_ops); |
| 1269 | |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1270 | /* Event list interface */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1271 | if (!entry) |
| 1272 | pr_warning("Could not create debugfs " |
| 1273 | "'kprobe_events' entry\n"); |
Masami Hiramatsu | cd7e7bd | 2009-08-13 16:35:42 -0400 | [diff] [blame] | 1274 | |
| 1275 | /* Profile interface */ |
| 1276 | entry = debugfs_create_file("kprobe_profile", 0444, d_tracer, |
| 1277 | NULL, &kprobe_profile_ops); |
| 1278 | |
| 1279 | if (!entry) |
| 1280 | pr_warning("Could not create debugfs " |
| 1281 | "'kprobe_profile' entry\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1282 | return 0; |
| 1283 | } |
| 1284 | fs_initcall(init_kprobe_trace); |
| 1285 | |
| 1286 | |
| 1287 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 1288 | |
Steven Rostedt | 265a5b7 | 2011-06-06 22:35:13 -0400 | [diff] [blame] | 1289 | /* |
| 1290 | * The "__used" keeps gcc from removing the function symbol |
| 1291 | * from the kallsyms table. |
| 1292 | */ |
| 1293 | static __used int kprobe_trace_selftest_target(int a1, int a2, int a3, |
| 1294 | int a4, int a5, int a6) |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1295 | { |
| 1296 | return a1 + a2 + a3 + a4 + a5 + a6; |
| 1297 | } |
| 1298 | |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1299 | static struct ftrace_event_file * |
| 1300 | find_trace_probe_file(struct trace_probe *tp, struct trace_array *tr) |
| 1301 | { |
| 1302 | struct ftrace_event_file *file; |
| 1303 | |
| 1304 | list_for_each_entry(file, &tr->events, list) |
| 1305 | if (file->event_call == &tp->call) |
| 1306 | return file; |
| 1307 | |
| 1308 | return NULL; |
| 1309 | } |
| 1310 | |
Oleg Nesterov | 3fe3d61 | 2013-06-20 19:38:09 +0200 | [diff] [blame] | 1311 | /* |
| 1312 | * Nobody but us can call enable_trace_probe/disable_trace_probe at this |
| 1313 | * stage, we can do this lockless. |
| 1314 | */ |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1315 | static __init int kprobe_trace_self_tests_init(void) |
| 1316 | { |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1317 | int ret, warn = 0; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1318 | int (*target)(int, int, int, int, int, int); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1319 | struct trace_probe *tp; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1320 | struct ftrace_event_file *file; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1321 | |
| 1322 | target = kprobe_trace_selftest_target; |
| 1323 | |
| 1324 | pr_info("Testing kprobe tracing: "); |
| 1325 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1326 | ret = traceprobe_command("p:testprobe kprobe_trace_selftest_target " |
| 1327 | "$stack $stack0 +0($stack)", |
| 1328 | create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1329 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1330 | pr_warn("error on probing function entry.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1331 | warn++; |
| 1332 | } else { |
| 1333 | /* Enable trace point */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1334 | tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1335 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1336 | pr_warn("error on getting new probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1337 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1338 | } else { |
| 1339 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1340 | if (WARN_ON_ONCE(file == NULL)) { |
| 1341 | pr_warn("error on getting probe file.\n"); |
| 1342 | warn++; |
| 1343 | } else |
| 1344 | enable_trace_probe(tp, file); |
| 1345 | } |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1346 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1347 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1348 | ret = traceprobe_command("r:testprobe2 kprobe_trace_selftest_target " |
| 1349 | "$retval", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1350 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1351 | pr_warn("error on probing function return.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1352 | warn++; |
| 1353 | } else { |
| 1354 | /* Enable trace point */ |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1355 | tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1356 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1357 | pr_warn("error on getting 2nd new probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1358 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1359 | } else { |
| 1360 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1361 | if (WARN_ON_ONCE(file == NULL)) { |
| 1362 | pr_warn("error on getting probe file.\n"); |
| 1363 | warn++; |
| 1364 | } else |
| 1365 | enable_trace_probe(tp, file); |
| 1366 | } |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1367 | } |
| 1368 | |
| 1369 | if (warn) |
| 1370 | goto end; |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1371 | |
| 1372 | ret = target(1, 2, 3, 4, 5, 6); |
| 1373 | |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1374 | /* Disable trace points before removing it */ |
| 1375 | tp = find_trace_probe("testprobe", KPROBE_EVENT_SYSTEM); |
| 1376 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1377 | pr_warn("error on getting test probe.\n"); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1378 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1379 | } else { |
| 1380 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1381 | if (WARN_ON_ONCE(file == NULL)) { |
| 1382 | pr_warn("error on getting probe file.\n"); |
| 1383 | warn++; |
| 1384 | } else |
| 1385 | disable_trace_probe(tp, file); |
| 1386 | } |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1387 | |
| 1388 | tp = find_trace_probe("testprobe2", KPROBE_EVENT_SYSTEM); |
| 1389 | if (WARN_ON_ONCE(tp == NULL)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1390 | pr_warn("error on getting 2nd test probe.\n"); |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1391 | warn++; |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1392 | } else { |
| 1393 | file = find_trace_probe_file(tp, top_trace_array()); |
| 1394 | if (WARN_ON_ONCE(file == NULL)) { |
| 1395 | pr_warn("error on getting probe file.\n"); |
| 1396 | warn++; |
| 1397 | } else |
| 1398 | disable_trace_probe(tp, file); |
| 1399 | } |
Masami Hiramatsu | 02ca152 | 2011-10-04 19:44:38 +0900 | [diff] [blame] | 1400 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1401 | ret = traceprobe_command("-:testprobe", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1402 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1403 | pr_warn("error on deleting a probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1404 | warn++; |
| 1405 | } |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1406 | |
Srikar Dronamraju | 8ab83f5 | 2012-04-09 14:41:44 +0530 | [diff] [blame] | 1407 | ret = traceprobe_command("-:testprobe2", create_trace_probe); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1408 | if (WARN_ON_ONCE(ret)) { |
Masami Hiramatsu | 41a7dd4 | 2013-05-09 14:44:49 +0900 | [diff] [blame] | 1409 | pr_warn("error on deleting a probe.\n"); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1410 | warn++; |
| 1411 | } |
| 1412 | |
| 1413 | end: |
Masami Hiramatsu | 7143f16 | 2011-06-27 16:26:36 +0900 | [diff] [blame] | 1414 | release_all_trace_probes(); |
Masami Hiramatsu | 231e36f | 2010-01-14 00:12:12 -0500 | [diff] [blame] | 1415 | if (warn) |
| 1416 | pr_cont("NG: Some tests are failed. Please check them.\n"); |
| 1417 | else |
| 1418 | pr_cont("OK\n"); |
Masami Hiramatsu | 413d37d | 2009-08-13 16:35:11 -0400 | [diff] [blame] | 1419 | return 0; |
| 1420 | } |
| 1421 | |
| 1422 | late_initcall(kprobe_trace_self_tests_init); |
| 1423 | |
| 1424 | #endif |