projects / lttng-modules.git / blame
| Commit | Line | Data |
|---|---|---|
| a90917c3 MD |
1 | #ifndef _LTTNG_WRAPPER_FTRACE_H |
| 2 | #define _LTTNG_WRAPPER_FTRACE_H | |
| 5a9479dc MD |
3 | |
| 4 | /* | |
| 886d51a3 | 5 | * wrapper/ftrace.h |
| 5a9479dc MD |
6 | * |
| 7 | * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when | |
| 8 | * available, else we need to have a kernel that exports this function to GPL | |
| 9 | * modules. | |
| 10 | * | |
| 886d51a3 MD |
11 | * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 12 | * | |
| 13 | * This library is free software; you can redistribute it and/or | |
| 14 | * modify it under the terms of the GNU Lesser General Public | |
| 15 | * License as published by the Free Software Foundation; only | |
| 16 | * version 2.1 of the License. | |
| 17 | * | |
| 18 | * This library is distributed in the hope that it will be useful, | |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 21 | * Lesser General Public License for more details. | |
| 22 | * | |
| 23 | * You should have received a copy of the GNU Lesser General Public | |
| 24 | * License along with this library; if not, write to the Free Software | |
| 25 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 5a9479dc MD |
26 | */ |
| 27 | ||
| 28 | #include <linux/ftrace.h> | |
| 5d849667 MJ |
29 | #include <linux/version.h> |
| 30 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0)) | |
| 31 | #include <../kernel/trace/trace.h> | |
| 32 | #endif | |
| 5a9479dc MD |
33 | |
| 34 | #ifdef CONFIG_KALLSYMS | |
| 35 | ||
| 36 | #include <linux/kallsyms.h> | |
| 5a2f5e92 | 37 | #include <wrapper/kallsyms.h> |
| 5a9479dc MD |
38 | |
| 39 | static inline | |
| 40 | int wrapper_register_ftrace_function_probe(char *glob, | |
| 41 | struct ftrace_probe_ops *ops, void *data) | |
| 42 | { | |
| 43 | int (*register_ftrace_function_probe_sym)(char *glob, | |
| 44 | struct ftrace_probe_ops *ops, void *data); | |
| 45 | ||
| c539a324 | 46 | register_ftrace_function_probe_sym = (void *) kallsyms_lookup_funcptr("register_ftrace_function_probe"); |
| 5a9479dc MD |
47 | if (register_ftrace_function_probe_sym) { |
| 48 | return register_ftrace_function_probe_sym(glob, ops, data); | |
| 49 | } else { | |
| e36de50d | 50 | printk_once(KERN_WARNING "LTTng: register_ftrace_function_probe symbol lookup failed.\n"); |
| 5a9479dc MD |
51 | return -EINVAL; |
| 52 | } | |
| 53 | } | |
| 54 | ||
| 55 | static inline | |
| 56 | void wrapper_unregister_ftrace_function_probe(char *glob, | |
| 57 | struct ftrace_probe_ops *ops, void *data) | |
| 58 | { | |
| 59 | void (*unregister_ftrace_function_probe_sym)(char *glob, | |
| 60 | struct ftrace_probe_ops *ops, void *data); | |
| 61 | ||
| c539a324 | 62 | unregister_ftrace_function_probe_sym = (void *) kallsyms_lookup_funcptr("unregister_ftrace_function_probe"); |
| 5a9479dc MD |
63 | if (unregister_ftrace_function_probe_sym) { |
| 64 | unregister_ftrace_function_probe_sym(glob, ops, data); | |
| 65 | } else { | |
| e36de50d | 66 | printk_once(KERN_WARNING "LTTng: unregister_ftrace_function_probe symbol lookup failed.\n"); |
| 5a9479dc MD |
67 | WARN_ON(1); |
| 68 | } | |
| 69 | } | |
| 70 | ||
| 71 | #else | |
| 72 | ||
| 73 | static inline | |
| 74 | int wrapper_register_ftrace_function_probe(char *glob, | |
| c4c357a4 | 75 | struct ftrace_probe_ops *ops, void *data) |
| 5a9479dc | 76 | { |
| 9fe47d18 | 77 | return register_ftrace_function_probe(glob, ops, data); |
| 5a9479dc MD |
78 | } |
| 79 | ||
| 80 | static inline | |
| 81 | void wrapper_unregister_ftrace_function_probe(char *glob, | |
| c4c357a4 | 82 | struct ftrace_probe_ops *ops, void *data) |
| 5a9479dc | 83 | { |
| 9fe47d18 | 84 | return unregister_ftrace_function_probe(glob, ops, data); |
| 5a9479dc MD |
85 | } |
| 86 | #endif | |
| 87 | ||
| a90917c3 | 88 | #endif /* _LTTNG_WRAPPER_FTRACE_H */ |