linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * This file contains functions which emulate a local clock-event

 * device via a broadcast event source.

 *

 * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>

 * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar

 * Copyright(C) 2006-2007, Timesys Corp., Thomas Gleixner

 */

#include <linux/cpu.h>

#include <linux/err.h>

#include <linux/hrtimer.h>

#include <linux/interrupt.h>

#include <linux/percpu.h>

#include <linux/profile.h>

#include <linux/sched.h>

#include <linux/smp.h>

#include <linux/module.h>

​

#include "tick-internal.h"

​

/*

 * Broadcast support for broken x86 hardware, where the local apic

 * timer stops in C3 state.

 */

​

static struct tick_device tick_broadcast_device;

static cpumask_var_t tick_broadcast_mask __cpumask_var_read_mostly;

static cpumask_var_t tick_broadcast_on __cpumask_var_read_mostly;

static cpumask_var_t tmpmask __cpumask_var_read_mostly;

static int tick_broadcast_forced;

​

static __cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(tick_broadcast_lock);

​

#ifdef CONFIG_TICK_ONESHOT

static void tick_broadcast_setup_oneshot(struct clock_event_device *bc);

static void tick_broadcast_clear_oneshot(int cpu);

static void tick_resume_broadcast_oneshot(struct clock_event_device *bc);

#else

static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { BUG(); }

static inline void tick_broadcast_clear_oneshot(int cpu) { }

static inline void tick_resume_broadcast_oneshot(struct clock_event_device *bc) { }

#endif

​

/*

 * Debugging: see timer_list.c

 */

struct tick_device *tick_get_broadcast_device(void)

{

    return &tick_broadcast_device;

}

​

struct cpumask *tick_get_broadcast_mask(void)

{

    return tick_broadcast_mask;

}

​

/*

 * Start the device in periodic mode

 */

static void tick_broadcast_start_periodic(struct clock_event_device *bc)

{

    if (bc)