Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Author: Kumar Gala <galak@kernel.crashing.org>
 *
 * Copyright 2009 Freescale Semiconductor Inc.
 */
 
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/hardirq.h>
 
#include <asm/dbell.h>
#include <asm/irq_regs.h>
#include <asm/kvm_ppc.h>
#include <asm/trace.h>
 
#ifdef CONFIG_SMP
 
void doorbell_exception(struct pt_regs *regs)
{
<------>struct pt_regs *old_regs = set_irq_regs(regs);
 
<------>irq_enter();
<------>trace_doorbell_entry(regs);
 
<------>ppc_msgsync();
 
<------>may_hard_irq_enable();
 
<------>kvmppc_clear_host_ipi(smp_processor_id());
<------>__this_cpu_inc(irq_stat.doorbell_irqs);
 
<------>smp_ipi_demux_relaxed(); /* already performed the barrier */
 
<------>trace_doorbell_exit(regs);
<------>irq_exit();
<------>set_irq_regs(old_regs);
}
#else /* CONFIG_SMP */
void doorbell_exception(struct pt_regs *regs)
{
<------>printk(KERN_WARNING "Received doorbell on non-smp system\n");
}
#endif /* CONFIG_SMP */