| // 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 */ |
| |
