7c572ac0cf
When the boot tracer can't handle an entry output, it returns 1. It should return 0 to relay on other output functions. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
101 lines
2 KiB
C
101 lines
2 KiB
C
/*
|
|
* ring buffer based initcalls tracer
|
|
*
|
|
* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/ftrace.h>
|
|
|
|
#include "trace.h"
|
|
|
|
static struct trace_array *boot_trace;
|
|
static int trace_boot_enabled;
|
|
|
|
|
|
/* Should be started after do_pre_smp_initcalls() in init/main.c */
|
|
void start_boot_trace(void)
|
|
{
|
|
trace_boot_enabled = 1;
|
|
}
|
|
|
|
void stop_boot_trace(struct trace_array *tr)
|
|
{
|
|
trace_boot_enabled = 0;
|
|
}
|
|
|
|
static void boot_trace_init(struct trace_array *tr)
|
|
{
|
|
int cpu;
|
|
boot_trace = tr;
|
|
|
|
trace_boot_enabled = 0;
|
|
|
|
for_each_cpu_mask(cpu, cpu_possible_map)
|
|
tracing_reset(tr->data[cpu]);
|
|
}
|
|
|
|
static void boot_trace_ctrl_update(struct trace_array *tr)
|
|
{
|
|
if (tr->ctrl)
|
|
start_boot_trace();
|
|
else
|
|
stop_boot_trace(tr);
|
|
}
|
|
|
|
static int initcall_print_line(struct trace_iterator *iter)
|
|
{
|
|
int ret = 0;
|
|
struct trace_entry *entry = iter->ent;
|
|
struct boot_trace *it = &entry->field.initcall;
|
|
struct trace_seq *s = &iter->seq;
|
|
|
|
if (iter->ent->type == TRACE_BOOT)
|
|
ret = trace_seq_printf(s, "%pF called from %i "
|
|
"returned %d after %lld msecs\n",
|
|
it->func, it->caller, it->result,
|
|
it->duration);
|
|
if (ret)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
struct tracer boot_tracer __read_mostly =
|
|
{
|
|
.name = "initcall",
|
|
.init = boot_trace_init,
|
|
.reset = stop_boot_trace,
|
|
.ctrl_update = boot_trace_ctrl_update,
|
|
.print_line = initcall_print_line,
|
|
};
|
|
|
|
|
|
void trace_boot(struct boot_trace *it)
|
|
{
|
|
struct trace_entry *entry;
|
|
struct trace_array_cpu *data;
|
|
unsigned long irq_flags;
|
|
struct trace_array *tr = boot_trace;
|
|
|
|
if (!trace_boot_enabled)
|
|
return;
|
|
|
|
preempt_disable();
|
|
data = tr->data[smp_processor_id()];
|
|
|
|
raw_local_irq_save(irq_flags);
|
|
__raw_spin_lock(&data->lock);
|
|
|
|
entry = tracing_get_trace_entry(tr, data);
|
|
tracing_generic_entry_update(entry, 0);
|
|
entry->type = TRACE_BOOT;
|
|
entry->field.initcall = *it;
|
|
|
|
__raw_spin_unlock(&data->lock);
|
|
raw_local_irq_restore(irq_flags);
|
|
trace_wake_up();
|
|
|
|
preempt_enable();
|
|
}
|