| // 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 */ |