arch/x86/xen/suspend.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/tick.h>

#include <xen/xen.h>
#include <xen/interface/xen.h>
#include <xen/grant_table.h>
#include <xen/events.h>

#include <asm/xen/hypercall.h>
#include <asm/xen/page.h>
#include <asm/fixmap.h>

#include "xen-ops.h"
#include "mmu.h"
#include "pmu.h"

void xen_arch_pre_suspend(void)
{
	xen_save_time_memory_area();

	if (xen_pv_domain())
		xen_pv_pre_suspend();
}

void xen_arch_post_suspend(int cancelled)
{
	if (xen_pv_domain())
		xen_pv_post_suspend(cancelled);
	else
		xen_hvm_post_suspend(cancelled);

	xen_restore_time_memory_area();
}

static void xen_vcpu_notify_restore(void *data)
{
	/* Boot processor notified via generic timekeeping_resume() */
	if (smp_processor_id() == 0)
		return;

	tick_resume_local();
}

static void xen_vcpu_notify_suspend(void *data)
{
	tick_suspend_local();
}

void xen_arch_resume(void)
{
	int cpu;

	on_each_cpu(xen_vcpu_notify_restore, NULL, 1);

	for_each_online_cpu(cpu)
		xen_pmu_init(cpu);
}

void xen_arch_suspend(void)
{
	int cpu;

	for_each_online_cpu(cpu)
		xen_pmu_finish(cpu);

	on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
}