static int function_trace_init(struct trace_array *tr)
{
func_trace = tr;
- tr->cpu = get_cpu();
+ tr->trace_buffer.cpu = get_cpu();
put_cpu();
tracing_start_cmdline_record();
static void function_trace_start(struct trace_array *tr)
{
- tracing_reset_online_cpus(tr);
+ tracing_reset_online_cpus(&tr->trace_buffer);
}
/* Our option */
goto out;
cpu = smp_processor_id();
- data = tr->data[cpu];
+ data = per_cpu_ptr(tr->trace_buffer.data, cpu);
if (!atomic_read(&data->disabled)) {
local_save_flags(flags);
trace_function(tr, ip, parent_ip, flags, pc);
*/
local_irq_save(flags);
cpu = raw_smp_processor_id();
- data = tr->data[cpu];
+ data = per_cpu_ptr(tr->trace_buffer.data, cpu);
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
};
#ifdef CONFIG_DYNAMIC_FTRACE
-static void
-ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
+static int update_count(void **data)
{
- long *count = (long *)data;
-
- if (tracing_is_on())
- return;
+ unsigned long *count = (long *)data;
if (!*count)
- return;
+ return 0;
if (*count != -1)
(*count)--;
- tracing_on();
+ return 1;
}
static void
-ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
+ftrace_traceon_count(unsigned long ip, unsigned long parent_ip, void **data)
{
- long *count = (long *)data;
+ if (tracing_is_on())
+ return;
+
+ if (update_count(data))
+ tracing_on();
+}
+static void
+ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip, void **data)
+{
if (!tracing_is_on())
return;
- if (!*count)
+ if (update_count(data))
+ tracing_off();
+}
+
+static void
+ftrace_traceon(unsigned long ip, unsigned long parent_ip, void **data)
+{
+ if (tracing_is_on())
return;
- if (*count != -1)
- (*count)--;
+ tracing_on();
+}
+
+static void
+ftrace_traceoff(unsigned long ip, unsigned long parent_ip, void **data)
+{
+ if (!tracing_is_on())
+ return;
tracing_off();
}
-static int
-ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,
- struct ftrace_probe_ops *ops, void *data);
+/*
+ * Skip 4:
+ * ftrace_stacktrace()
+ * function_trace_probe_call()
+ * ftrace_ops_list_func()
+ * ftrace_call()
+ */
+#define STACK_SKIP 4
-static struct ftrace_probe_ops traceon_probe_ops = {
- .func = ftrace_traceon,
- .print = ftrace_trace_onoff_print,
-};
+static void
+ftrace_stacktrace(unsigned long ip, unsigned long parent_ip, void **data)
+{
+ trace_dump_stack(STACK_SKIP);
+}
-static struct ftrace_probe_ops traceoff_probe_ops = {
- .func = ftrace_traceoff,
- .print = ftrace_trace_onoff_print,
-};
+static void
+ftrace_stacktrace_count(unsigned long ip, unsigned long parent_ip, void **data)
+{
+ if (!tracing_is_on())
+ return;
+
+ if (update_count(data))
+ trace_dump_stack(STACK_SKIP);
+}
static int
-ftrace_trace_onoff_print(struct seq_file *m, unsigned long ip,
- struct ftrace_probe_ops *ops, void *data)
+ftrace_probe_print(const char *name, struct seq_file *m,
+ unsigned long ip, void *data)
{
long count = (long)data;
- seq_printf(m, "%ps:", (void *)ip);
-
- if (ops == &traceon_probe_ops)
- seq_printf(m, "traceon");
- else
- seq_printf(m, "traceoff");
+ seq_printf(m, "%ps:%s", (void *)ip, name);
if (count == -1)
seq_printf(m, ":unlimited\n");
}
static int
-ftrace_trace_onoff_unreg(char *glob, char *cmd, char *param)
+ftrace_traceon_print(struct seq_file *m, unsigned long ip,
+ struct ftrace_probe_ops *ops, void *data)
{
- struct ftrace_probe_ops *ops;
-
- /* we register both traceon and traceoff to this callback */
- if (strcmp(cmd, "traceon") == 0)
- ops = &traceon_probe_ops;
- else
- ops = &traceoff_probe_ops;
+ return ftrace_probe_print("traceon", m, ip, data);
+}
- unregister_ftrace_function_probe_func(glob, ops);
+static int
+ftrace_traceoff_print(struct seq_file *m, unsigned long ip,
+ struct ftrace_probe_ops *ops, void *data)
+{
+ return ftrace_probe_print("traceoff", m, ip, data);
+}
- return 0;
+static int
+ftrace_stacktrace_print(struct seq_file *m, unsigned long ip,
+ struct ftrace_probe_ops *ops, void *data)
+{
+ return ftrace_probe_print("stacktrace", m, ip, data);
}
+static struct ftrace_probe_ops traceon_count_probe_ops = {
+ .func = ftrace_traceon_count,
+ .print = ftrace_traceon_print,
+};
+
+static struct ftrace_probe_ops traceoff_count_probe_ops = {
+ .func = ftrace_traceoff_count,
+ .print = ftrace_traceoff_print,
+};
+
+static struct ftrace_probe_ops stacktrace_count_probe_ops = {
+ .func = ftrace_stacktrace_count,
+ .print = ftrace_stacktrace_print,
+};
+
+static struct ftrace_probe_ops traceon_probe_ops = {
+ .func = ftrace_traceon,
+ .print = ftrace_traceon_print,
+};
+
+static struct ftrace_probe_ops traceoff_probe_ops = {
+ .func = ftrace_traceoff,
+ .print = ftrace_traceoff_print,
+};
+
+static struct ftrace_probe_ops stacktrace_probe_ops = {
+ .func = ftrace_stacktrace,
+ .print = ftrace_stacktrace_print,
+};
+
static int
-ftrace_trace_onoff_callback(struct ftrace_hash *hash,
- char *glob, char *cmd, char *param, int enable)
+ftrace_trace_probe_callback(struct ftrace_probe_ops *ops,
+ struct ftrace_hash *hash, char *glob,
+ char *cmd, char *param, int enable)
{
- struct ftrace_probe_ops *ops;
void *count = (void *)-1;
char *number;
int ret;
if (!enable)
return -EINVAL;
- if (glob[0] == '!')
- return ftrace_trace_onoff_unreg(glob+1, cmd, param);
-
- /* we register both traceon and traceoff to this callback */
- if (strcmp(cmd, "traceon") == 0)
- ops = &traceon_probe_ops;
- else
- ops = &traceoff_probe_ops;
+ if (glob[0] == '!') {
+ unregister_ftrace_function_probe_func(glob+1, ops);
+ return 0;
+ }
if (!param)
goto out_reg;
return ret < 0 ? ret : 0;
}
+static int
+ftrace_trace_onoff_callback(struct ftrace_hash *hash,
+ char *glob, char *cmd, char *param, int enable)
+{
+ struct ftrace_probe_ops *ops;
+
+ /* we register both traceon and traceoff to this callback */
+ if (strcmp(cmd, "traceon") == 0)
+ ops = param ? &traceon_count_probe_ops : &traceon_probe_ops;
+ else
+ ops = param ? &traceoff_count_probe_ops : &traceoff_probe_ops;
+
+ return ftrace_trace_probe_callback(ops, hash, glob, cmd,
+ param, enable);
+}
+
+static int
+ftrace_stacktrace_callback(struct ftrace_hash *hash,
+ char *glob, char *cmd, char *param, int enable)
+{
+ struct ftrace_probe_ops *ops;
+
+ ops = param ? &stacktrace_count_probe_ops : &stacktrace_probe_ops;
+
+ return ftrace_trace_probe_callback(ops, hash, glob, cmd,
+ param, enable);
+}
+
static struct ftrace_func_command ftrace_traceon_cmd = {
.name = "traceon",
.func = ftrace_trace_onoff_callback,
.func = ftrace_trace_onoff_callback,
};
+static struct ftrace_func_command ftrace_stacktrace_cmd = {
+ .name = "stacktrace",
+ .func = ftrace_stacktrace_callback,
+};
+
static int __init init_func_cmd_traceon(void)
{
int ret;
ret = register_ftrace_command(&ftrace_traceon_cmd);
if (ret)
unregister_ftrace_command(&ftrace_traceoff_cmd);
+
+ ret = register_ftrace_command(&ftrace_stacktrace_cmd);
+ if (ret) {
+ unregister_ftrace_command(&ftrace_traceoff_cmd);
+ unregister_ftrace_command(&ftrace_traceon_cmd);
+ }
return ret;
}
#else
projects / firefly-linux-kernel-4.4.55.git / blobdiff