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Diffstat (limited to 'kernel/trace/trace_syscalls.c')
-rw-r--r--kernel/trace/trace_syscalls.c90
1 files changed, 51 insertions, 39 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 7a809e321058..8f2ac73c7a5f 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -12,10 +12,6 @@
#include "trace.h"
static DEFINE_MUTEX(syscall_trace_lock);
-static int sys_refcount_enter;
-static int sys_refcount_exit;
-static DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
-static DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
static int syscall_enter_register(struct ftrace_event_call *event,
enum trace_reg type, void *data);
@@ -41,7 +37,7 @@ static inline bool arch_syscall_match_sym_name(const char *sym, const char *name
/*
* Only compare after the "sys" prefix. Archs that use
* syscall wrappers may have syscalls symbols aliases prefixed
- * with "SyS" instead of "sys", leading to an unwanted
+ * with ".SyS" or ".sys" instead of "sys", leading to an unwanted
* mismatch.
*/
return !strcmp(sym + 3, name + 3);
@@ -265,7 +261,7 @@ static void free_syscall_print_fmt(struct ftrace_event_call *call)
kfree(call->print_fmt);
}
-static int syscall_enter_define_fields(struct ftrace_event_call *call)
+static int __init syscall_enter_define_fields(struct ftrace_event_call *call)
{
struct syscall_trace_enter trace;
struct syscall_metadata *meta = call->data;
@@ -288,7 +284,7 @@ static int syscall_enter_define_fields(struct ftrace_event_call *call)
return ret;
}
-static int syscall_exit_define_fields(struct ftrace_event_call *call)
+static int __init syscall_exit_define_fields(struct ftrace_event_call *call)
{
struct syscall_trace_exit trace;
int ret;
@@ -303,8 +299,9 @@ static int syscall_exit_define_fields(struct ftrace_event_call *call)
return ret;
}
-static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
+static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
{
+ struct trace_array *tr = data;
struct syscall_trace_enter *entry;
struct syscall_metadata *sys_data;
struct ring_buffer_event *event;
@@ -315,7 +312,7 @@ static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
syscall_nr = trace_get_syscall_nr(current, regs);
if (syscall_nr < 0)
return;
- if (!test_bit(syscall_nr, enabled_enter_syscalls))
+ if (!test_bit(syscall_nr, tr->enabled_enter_syscalls))
return;
sys_data = syscall_nr_to_meta(syscall_nr);
@@ -324,7 +321,8 @@ static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
- event = trace_current_buffer_lock_reserve(&buffer,
+ buffer = tr->trace_buffer.buffer;
+ event = trace_buffer_lock_reserve(buffer,
sys_data->enter_event->event.type, size, 0, 0);
if (!event)
return;
@@ -338,8 +336,9 @@ static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
trace_current_buffer_unlock_commit(buffer, event, 0, 0);
}
-static void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
+static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
{
+ struct trace_array *tr = data;
struct syscall_trace_exit *entry;
struct syscall_metadata *sys_data;
struct ring_buffer_event *event;
@@ -349,14 +348,15 @@ static void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
syscall_nr = trace_get_syscall_nr(current, regs);
if (syscall_nr < 0)
return;
- if (!test_bit(syscall_nr, enabled_exit_syscalls))
+ if (!test_bit(syscall_nr, tr->enabled_exit_syscalls))
return;
sys_data = syscall_nr_to_meta(syscall_nr);
if (!sys_data)
return;
- event = trace_current_buffer_lock_reserve(&buffer,
+ buffer = tr->trace_buffer.buffer;
+ event = trace_buffer_lock_reserve(buffer,
sys_data->exit_event->event.type, sizeof(*entry), 0, 0);
if (!event)
return;
@@ -370,8 +370,10 @@ static void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
trace_current_buffer_unlock_commit(buffer, event, 0, 0);
}
-static int reg_event_syscall_enter(struct ftrace_event_call *call)
+static int reg_event_syscall_enter(struct ftrace_event_file *file,
+ struct ftrace_event_call *call)
{
+ struct trace_array *tr = file->tr;
int ret = 0;
int num;
@@ -379,33 +381,37 @@ static int reg_event_syscall_enter(struct ftrace_event_call *call)
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return -ENOSYS;
mutex_lock(&syscall_trace_lock);
- if (!sys_refcount_enter)
- ret = register_trace_sys_enter(ftrace_syscall_enter, NULL);
+ if (!tr->sys_refcount_enter)
+ ret = register_trace_sys_enter(ftrace_syscall_enter, tr);
if (!ret) {
- set_bit(num, enabled_enter_syscalls);
- sys_refcount_enter++;
+ set_bit(num, tr->enabled_enter_syscalls);
+ tr->sys_refcount_enter++;
}
mutex_unlock(&syscall_trace_lock);
return ret;
}
-static void unreg_event_syscall_enter(struct ftrace_event_call *call)
+static void unreg_event_syscall_enter(struct ftrace_event_file *file,
+ struct ftrace_event_call *call)
{
+ struct trace_array *tr = file->tr;
int num;
num = ((struct syscall_metadata *)call->data)->syscall_nr;
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return;
mutex_lock(&syscall_trace_lock);
- sys_refcount_enter--;
- clear_bit(num, enabled_enter_syscalls);
- if (!sys_refcount_enter)
- unregister_trace_sys_enter(ftrace_syscall_enter, NULL);
+ tr->sys_refcount_enter--;
+ clear_bit(num, tr->enabled_enter_syscalls);
+ if (!tr->sys_refcount_enter)
+ unregister_trace_sys_enter(ftrace_syscall_enter, tr);
mutex_unlock(&syscall_trace_lock);
}
-static int reg_event_syscall_exit(struct ftrace_event_call *call)
+static int reg_event_syscall_exit(struct ftrace_event_file *file,
+ struct ftrace_event_call *call)
{
+ struct trace_array *tr = file->tr;
int ret = 0;
int num;
@@ -413,28 +419,30 @@ static int reg_event_syscall_exit(struct ftrace_event_call *call)
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return -ENOSYS;
mutex_lock(&syscall_trace_lock);
- if (!sys_refcount_exit)
- ret = register_trace_sys_exit(ftrace_syscall_exit, NULL);
+ if (!tr->sys_refcount_exit)
+ ret = register_trace_sys_exit(ftrace_syscall_exit, tr);
if (!ret) {
- set_bit(num, enabled_exit_syscalls);
- sys_refcount_exit++;
+ set_bit(num, tr->enabled_exit_syscalls);
+ tr->sys_refcount_exit++;
}
mutex_unlock(&syscall_trace_lock);
return ret;
}
-static void unreg_event_syscall_exit(struct ftrace_event_call *call)
+static void unreg_event_syscall_exit(struct ftrace_event_file *file,
+ struct ftrace_event_call *call)
{
+ struct trace_array *tr = file->tr;
int num;
num = ((struct syscall_metadata *)call->data)->syscall_nr;
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return;
mutex_lock(&syscall_trace_lock);
- sys_refcount_exit--;
- clear_bit(num, enabled_exit_syscalls);
- if (!sys_refcount_exit)
- unregister_trace_sys_exit(ftrace_syscall_exit, NULL);
+ tr->sys_refcount_exit--;
+ clear_bit(num, tr->enabled_exit_syscalls);
+ if (!tr->sys_refcount_exit)
+ unregister_trace_sys_exit(ftrace_syscall_exit, tr);
mutex_unlock(&syscall_trace_lock);
}
@@ -471,7 +479,7 @@ struct trace_event_functions exit_syscall_print_funcs = {
.trace = print_syscall_exit,
};
-struct ftrace_event_class event_class_syscall_enter = {
+struct ftrace_event_class __refdata event_class_syscall_enter = {
.system = "syscalls",
.reg = syscall_enter_register,
.define_fields = syscall_enter_define_fields,
@@ -479,7 +487,7 @@ struct ftrace_event_class event_class_syscall_enter = {
.raw_init = init_syscall_trace,
};
-struct ftrace_event_class event_class_syscall_exit = {
+struct ftrace_event_class __refdata event_class_syscall_exit = {
.system = "syscalls",
.reg = syscall_exit_register,
.define_fields = syscall_exit_define_fields,
@@ -685,11 +693,13 @@ static void perf_sysexit_disable(struct ftrace_event_call *call)
static int syscall_enter_register(struct ftrace_event_call *event,
enum trace_reg type, void *data)
{
+ struct ftrace_event_file *file = data;
+
switch (type) {
case TRACE_REG_REGISTER:
- return reg_event_syscall_enter(event);
+ return reg_event_syscall_enter(file, event);
case TRACE_REG_UNREGISTER:
- unreg_event_syscall_enter(event);
+ unreg_event_syscall_enter(file, event);
return 0;
#ifdef CONFIG_PERF_EVENTS
@@ -711,11 +721,13 @@ static int syscall_enter_register(struct ftrace_event_call *event,
static int syscall_exit_register(struct ftrace_event_call *event,
enum trace_reg type, void *data)
{
+ struct ftrace_event_file *file = data;
+
switch (type) {
case TRACE_REG_REGISTER:
- return reg_event_syscall_exit(event);
+ return reg_event_syscall_exit(file, event);
case TRACE_REG_UNREGISTER:
- unreg_event_syscall_exit(event);
+ unreg_event_syscall_exit(file, event);
return 0;
#ifdef CONFIG_PERF_EVENTS
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-06 02:37:15 +0000