// 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/interrupt.h>#include <asm/irq_regs.h>#include <asm/kvm_ppc.h>#include <asm/trace.h> #ifdef CONFIG_SMP DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception){	struct pt_regs *old_regs = set_irq_regs(regs); 	trace_doorbell_entry(regs); 	ppc_msgsync(); 	if (should_hard_irq_enable(regs))		do_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); 	set_irq_regs(old_regs);}#else /* CONFIG_SMP */DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception){	printk(KERN_WARNING "Received doorbell on non-smp system\n");}#endif /* CONFIG_SMP */