#include <linux/debugfs.h>
#include <linux/ftrace.h>
#include <linux/kallsyms.h>
+#include <linux/time.h>
#include "trace.h"
+#include "trace_output.h"
static struct trace_array *boot_trace;
-static int trace_boot_enabled;
+static bool pre_initcalls_finished;
-
-/* Should be started after do_pre_smp_initcalls() in init/main.c */
+/* Tells the boot tracer that the pre_smp_initcalls are finished.
+ * So we are ready .
+ * It doesn't enable sched events tracing however.
+ * You have to call enable_boot_trace to do so.
+ */
void start_boot_trace(void)
{
- trace_boot_enabled = 1;
+ pre_initcalls_finished = true;
+}
+
+void enable_boot_trace(void)
+{
+ if (boot_trace && pre_initcalls_finished)
+ tracing_start_sched_switch_record();
}
-void stop_boot_trace(struct trace_array *tr)
+void disable_boot_trace(void)
{
- trace_boot_enabled = 0;
+ if (boot_trace && pre_initcalls_finished)
+ tracing_stop_sched_switch_record();
}
-static void boot_trace_init(struct trace_array *tr)
+static int boot_trace_init(struct trace_array *tr)
{
- int cpu;
boot_trace = tr;
- trace_boot_enabled = 0;
+ if (!tr)
+ return 0;
- for_each_cpu_mask(cpu, cpu_possible_map)
- tracing_reset(tr, cpu);
+ tracing_reset_online_cpus(tr);
+
+ tracing_sched_switch_assign_trace(tr);
+ return 0;
}
-static void boot_trace_ctrl_update(struct trace_array *tr)
+static enum print_line_t
+initcall_call_print_line(struct trace_iterator *iter)
{
- if (tr->ctrl)
- start_boot_trace();
+ struct trace_entry *entry = iter->ent;
+ struct trace_seq *s = &iter->seq;
+ struct trace_boot_call *field;
+ struct boot_trace_call *call;
+ u64 ts;
+ unsigned long nsec_rem;
+ int ret;
+
+ trace_assign_type(field, entry);
+ call = &field->boot_call;
+ ts = iter->ts;
+ nsec_rem = do_div(ts, NSEC_PER_SEC);
+
+ ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n",
+ (unsigned long)ts, nsec_rem, call->func, call->caller);
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
else
- stop_boot_trace(tr);
+ return TRACE_TYPE_HANDLED;
}
-static enum print_line_t initcall_print_line(struct trace_iterator *iter)
+static enum print_line_t
+initcall_ret_print_line(struct trace_iterator *iter)
{
- int ret;
struct trace_entry *entry = iter->ent;
- struct trace_boot *field = (struct trace_boot *)entry;
- struct boot_trace *it = &field->initcall;
struct trace_seq *s = &iter->seq;
- struct timespec calltime = ktime_to_timespec(it->calltime);
- struct timespec rettime = ktime_to_timespec(it->rettime);
-
- if (entry->type == TRACE_BOOT) {
- ret = trace_seq_printf(s, "[%5ld.%06ld] calling %s @ %i\n",
- calltime.tv_sec,
- calltime.tv_nsec,
- it->func, it->caller);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
- ret = trace_seq_printf(s, "[%5ld.%06ld] initcall %s "
- "returned %d after %lld msecs\n",
- rettime.tv_sec,
- rettime.tv_nsec,
- it->func, it->result, it->duration);
-
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
+ struct trace_boot_ret *field;
+ struct boot_trace_ret *init_ret;
+ u64 ts;
+ unsigned long nsec_rem;
+ int ret;
+
+ trace_assign_type(field, entry);
+ init_ret = &field->boot_ret;
+ ts = iter->ts;
+ nsec_rem = do_div(ts, NSEC_PER_SEC);
+
+ ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
+ "returned %d after %llu msecs\n",
+ (unsigned long) ts,
+ nsec_rem,
+ init_ret->func, init_ret->result, init_ret->duration);
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ else
return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t initcall_print_line(struct trace_iterator *iter)
+{
+ struct trace_entry *entry = iter->ent;
+
+ switch (entry->type) {
+ case TRACE_BOOT_CALL:
+ return initcall_call_print_line(iter);
+ case TRACE_BOOT_RET:
+ return initcall_ret_print_line(iter);
+ default:
+ return TRACE_TYPE_UNHANDLED;
}
- return TRACE_TYPE_UNHANDLED;
}
struct tracer boot_tracer __read_mostly =
{
.name = "initcall",
.init = boot_trace_init,
- .reset = stop_boot_trace,
- .ctrl_update = boot_trace_ctrl_update,
+ .reset = tracing_reset_online_cpus,
.print_line = initcall_print_line,
};
-void trace_boot(struct boot_trace *it, initcall_t fn)
+void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
{
+ struct ftrace_event_call *call = &event_boot_call;
struct ring_buffer_event *event;
- struct trace_boot *entry;
- struct trace_array_cpu *data;
- unsigned long irq_flags;
+ struct ring_buffer *buffer;
+ struct trace_boot_call *entry;
struct trace_array *tr = boot_trace;
- if (!trace_boot_enabled)
+ if (!tr || !pre_initcalls_finished)
return;
/* Get its name now since this function could
* disappear because it is in the .init section.
*/
- sprint_symbol(it->func, (unsigned long)fn);
+ sprint_symbol(bt->func, (unsigned long)fn);
preempt_disable();
- data = tr->data[smp_processor_id()];
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
- &irq_flags);
+ buffer = tr->buffer;
+ event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_CALL,
+ sizeof(*entry), 0, 0);
if (!event)
goto out;
entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, 0, 0);
- entry->ent.type = TRACE_BOOT;
- entry->initcall = *it;
- ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ entry->boot_call = *bt;
+ if (!filter_check_discard(call, entry, buffer, event))
+ trace_buffer_unlock_commit(buffer, event, 0, 0);
+ out:
+ preempt_enable();
+}
- trace_wake_up();
+void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
+{
+ struct ftrace_event_call *call = &event_boot_ret;
+ struct ring_buffer_event *event;
+ struct ring_buffer *buffer;
+ struct trace_boot_ret *entry;
+ struct trace_array *tr = boot_trace;
+ if (!tr || !pre_initcalls_finished)
+ return;
+
+ sprint_symbol(bt->func, (unsigned long)fn);
+ preempt_disable();
+
+ buffer = tr->buffer;
+ event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_RET,
+ sizeof(*entry), 0, 0);
+ if (!event)
+ goto out;
+ entry = ring_buffer_event_data(event);
+ entry->boot_ret = *bt;
+ if (!filter_check_discard(call, entry, buffer, event))
+ trace_buffer_unlock_commit(buffer, event, 0, 0);
out:
preempt_enable();
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff