linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * trace task wakeup timings

 *

 * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>

 * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>

 *

 * Based on code from the latency_tracer, that is:

 *

 *  Copyright (C) 2004-2006 Ingo Molnar

 *  Copyright (C) 2004 Nadia Yvette Chambers

 */

#include <linux/module.h>

#include <linux/kallsyms.h>

#include <linux/uaccess.h>

#include <linux/ftrace.h>

#include <linux/sched/rt.h>

#include <linux/sched/deadline.h>

#include <trace/events/sched.h>

#include "trace.h"

​

static struct trace_array   *wakeup_trace;

static int __read_mostly    tracer_enabled;

​

static struct task_struct   *wakeup_task;

static int          wakeup_cpu;

static int          wakeup_current_cpu;

static unsigned         wakeup_prio = -1;

static int          wakeup_rt;

static int          wakeup_dl;

static int          tracing_dl = 0;

​

static arch_spinlock_t wakeup_lock =

    (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;

​

static void wakeup_reset(struct trace_array *tr);

static void __wakeup_reset(struct trace_array *tr);

static int start_func_tracer(struct trace_array *tr, int graph);

static void stop_func_tracer(struct trace_array *tr, int graph);

​

static int save_flags;

​

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

# define is_graph(tr) ((tr)->trace_flags & TRACE_ITER_DISPLAY_GRAPH)

#else

# define is_graph(tr) false

#endif

​

#ifdef CONFIG_FUNCTION_TRACER

​

static bool function_enabled;

​

/*

 * Prologue for the wakeup function tracers.

 *

 * Returns 1 if it is OK to continue, and preemption

 *            is disabled and data->disabled is incremented.

 *         0 if the trace is to be ignored, and preemption

 *            is not disabled and data->disabled is

 *            kept the same.

 *

 * Note, this function is also used outside this ifdef but

 *  inside the #ifdef of the function graph tracer below.