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tracepoint: Support iterating tracepoints in a loading module

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Add for_each_tracepoint_in_module() function to iterate tracepoints in
a module. This API is needed for handling tracepoints in a loading
module from tracepoint_module_notifier callback function.
This also update for_each_module_tracepoint() to pass the module to
callback function so that it can find module easily.

Link: https://lore.kernel.org/all/172397778740.286558.15781131277732977643.stgit@devnote2/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Masami Hiramatsu (Google) 2024-08-18 19:43:07 +09:00
parent d5dbf8b48a
commit d4df54f338
2 changed files with 44 additions and 10 deletions
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17
include/linux/tracepoint.h
View File

@ -64,8 +64,13 @@ struct tp_module {
bool trace_module_has_bad_taint(struct module *mod);
extern int register_tracepoint_module_notifier(struct notifier_block *nb);
extern int unregister_tracepoint_module_notifier(struct notifier_block *nb);
void for_each_module_tracepoint(void (*fct)(struct tracepoint *, void *),
void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
struct module *, void *),
void *priv);
void for_each_tracepoint_in_module(struct module *,
void (*fct)(struct tracepoint *,
struct module *, void *),
void *priv);
#else
static inline bool trace_module_has_bad_taint(struct module *mod)
{
@ -82,10 +87,18 @@ int unregister_tracepoint_module_notifier(struct notifier_block *nb)
return 0;
}
static inline
void for_each_module_tracepoint(void (*fct)(struct tracepoint *, void *),
void for_each_module_tracepoint(void (*fct)(struct tracepoint *,
struct module *, void *),
void *priv)
{
}
static inline
void for_each_tracepoint_in_module(struct module *mod,
void (*fct)(struct tracepoint *,
struct module *, void *),
void *priv)
{
}
#endif /* CONFIG_MODULES */
/*

37
kernel/tracepoint.c
View File

@ -736,24 +736,45 @@ static __init int init_tracepoints(void)
}
__initcall(init_tracepoints);
/**
* for_each_tracepoint_in_module - iteration on all tracepoints in a module
* @mod: module
* @fct: callback
* @priv: private data
*/
void for_each_tracepoint_in_module(struct module *mod,
void (*fct)(struct tracepoint *tp,
struct module *mod, void *priv),
void *priv)
{
tracepoint_ptr_t *begin, *end, *iter;
lockdep_assert_held(&tracepoint_module_list_mutex);
if (!mod)
return;
begin = mod->tracepoints_ptrs;
end = mod->tracepoints_ptrs + mod->num_tracepoints;
for (iter = begin; iter < end; iter++)
fct(tracepoint_ptr_deref(iter), mod, priv);
}
/**
* for_each_module_tracepoint - iteration on all tracepoints in all modules
* @fct: callback
* @priv: private data
*/
void for_each_module_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
void for_each_module_tracepoint(void (*fct)(struct tracepoint *tp,
struct module *mod, void *priv),
void *priv)
{
struct tp_module *tp_mod;
struct module *mod;
mutex_lock(&tracepoint_module_list_mutex);
list_for_each_entry(tp_mod, &tracepoint_module_list, list) {
mod = tp_mod->mod;
for_each_tracepoint_range(mod->tracepoints_ptrs,
mod->tracepoints_ptrs + mod->num_tracepoints,
fct, priv);
}
list_for_each_entry(tp_mod, &tracepoint_module_list, list)
for_each_tracepoint_in_module(tp_mod->mod, fct, priv);
mutex_unlock(&tracepoint_module_list_mutex);
}
#endif /* CONFIG_MODULES */