leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ftrace: Add symbols for ftrace trampolines

Browse Source 
Symbols are needed for tools to describe instruction addresses. Pages
allocated for ftrace's purposes need symbols to be created for them.
Add such symbols to be visible via /proc/kallsyms.

Example on x86 with CONFIG_DYNAMIC_FTRACE=y

	# echo function > /sys/kernel/debug/tracing/current_tracer
	# cat /proc/kallsyms | grep '\[__builtin__ftrace\]'
	ffffffffc0238000 t ftrace_trampoline    [__builtin__ftrace]

Note: This patch adds "__builtin__ftrace" as a module name in /proc/kallsyms for
symbols for pages allocated for ftrace's purposes, even though "__builtin__ftrace"
is not a module.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200512121922.8997-7-adrian.hunter@intel.com
This commit is contained in:
Adrian Hunter 2020-05-12 15:19:13 +03:00 committed by Peter Zijlstra
parent 3e46bb40af
commit fc0ea795f5
3 changed files with 88 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/ftrace.h
View File

@ -58,9 +58,6 @@ struct ftrace_direct_func;
const char *
ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
unsigned long *off, char **modname, char *sym);
int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
char *type, char *name,
char *module_name, int *exported);
#else
static inline const char *
ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
@ -68,6 +65,13 @@ ftrace_mod_address_lookup(unsigned long addr, unsigned long *size,
{
return NULL;
}
#endif
#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
char *type, char *name,
char *module_name, int *exported);
#else
static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
char *type, char *name,
char *module_name, int *exported)
@ -76,7 +80,6 @@ static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *val
}
#endif
#ifdef CONFIG_FUNCTION_TRACER
extern int ftrace_enabled;
@ -207,6 +210,7 @@ struct ftrace_ops {
struct ftrace_ops_hash old_hash;
unsigned long trampoline;
unsigned long trampoline_size;
struct list_head list;
#endif
};

5
kernel/kallsyms.c
View File

@ -482,6 +482,11 @@ static int get_ksymbol_mod(struct kallsym_iter *iter)
return 1;
}
/*
* ftrace_mod_get_kallsym() may also get symbols for pages allocated for ftrace
* purposes. In that case "__builtin__ftrace" is used as a module name, even
* though "__builtin__ftrace" is not a module.
*/
static int get_ksymbol_ftrace_mod(struct kallsym_iter *iter)
{
int ret = ftrace_mod_get_kallsym(iter->pos - iter->pos_mod_end,

77
kernel/trace/ftrace.c
View File

@ -2764,6 +2764,38 @@ void __weak arch_ftrace_trampoline_free(struct ftrace_ops *ops)
{
}
/* List of trace_ops that have allocated trampolines */
static LIST_HEAD(ftrace_ops_trampoline_list);
static void ftrace_add_trampoline_to_kallsyms(struct ftrace_ops *ops)
{
lockdep_assert_held(&ftrace_lock);
list_add_rcu(&ops->list, &ftrace_ops_trampoline_list);
}
static void ftrace_remove_trampoline_from_kallsyms(struct ftrace_ops *ops)
{
lockdep_assert_held(&ftrace_lock);
list_del_rcu(&ops->list);
}
/*
* "__builtin__ftrace" is used as a module name in /proc/kallsyms for symbols
* for pages allocated for ftrace purposes, even though "__builtin__ftrace" is
* not a module.
*/
#define FTRACE_TRAMPOLINE_MOD "__builtin__ftrace"
#define FTRACE_TRAMPOLINE_SYM "ftrace_trampoline"
static void ftrace_trampoline_free(struct ftrace_ops *ops)
{
if (ops && (ops->flags & FTRACE_OPS_FL_ALLOC_TRAMP) &&
ops->trampoline)
ftrace_remove_trampoline_from_kallsyms(ops);
arch_ftrace_trampoline_free(ops);
}
static void ftrace_startup_enable(int command)
{
if (saved_ftrace_func != ftrace_trace_function) {
@ -2934,7 +2966,7 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
synchronize_rcu_tasks();
free_ops:
arch_ftrace_trampoline_free(ops);
ftrace_trampoline_free(ops);
}
return 0;
@ -6178,6 +6210,27 @@ struct ftrace_mod_map {
unsigned int num_funcs;
};
static int ftrace_get_trampoline_kallsym(unsigned int symnum,
unsigned long *value, char *type,
char *name, char *module_name,
int *exported)
{
struct ftrace_ops *op;
list_for_each_entry_rcu(op, &ftrace_ops_trampoline_list, list) {
if (!op->trampoline || symnum--)
continue;
*value = op->trampoline;
*type = 't';
strlcpy(name, FTRACE_TRAMPOLINE_SYM, KSYM_NAME_LEN);
strlcpy(module_name, FTRACE_TRAMPOLINE_MOD, MODULE_NAME_LEN);
*exported = 0;
return 0;
}
return -ERANGE;
}
#ifdef CONFIG_MODULES
#define next_to_ftrace_page(p) container_of(p, struct ftrace_page, next)
@ -6514,6 +6567,7 @@ int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
{
struct ftrace_mod_map *mod_map;
struct ftrace_mod_func *mod_func;
int ret;
preempt_disable();
list_for_each_entry_rcu(mod_map, &ftrace_mod_maps, list) {
@ -6540,8 +6594,10 @@ int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
WARN_ON(1);
break;
}
ret = ftrace_get_trampoline_kallsym(symnum, value, type, name,
module_name, exported);
preempt_enable();
return -ERANGE;
return ret;
}
#else
@ -6553,6 +6609,18 @@ allocate_ftrace_mod_map(struct module *mod,
{
return NULL;
}
int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value,
char *type, char *name, char *module_name,
int *exported)
{
int ret;
preempt_disable();
ret = ftrace_get_trampoline_kallsym(symnum, value, type, name,
module_name, exported);
preempt_enable();
return ret;
}
#endif /* CONFIG_MODULES */
struct ftrace_init_func {
@ -6733,7 +6801,12 @@ void __weak arch_ftrace_update_trampoline(struct ftrace_ops *ops)
static void ftrace_update_trampoline(struct ftrace_ops *ops)
{
unsigned long trampoline = ops->trampoline;
arch_ftrace_update_trampoline(ops);
if (ops->trampoline && ops->trampoline != trampoline &&
(ops->flags & FTRACE_OPS_FL_ALLOC_TRAMP))
ftrace_add_trampoline_to_kallsyms(ops);
}
void ftrace_init_trace_array(struct trace_array *tr)