1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Author: Kumar Gala <galak@kernel.crashing.org> 4 * 5 * Copyright 2009 Freescale Semiconductor Inc. 6 */ 7 8 #include <linux/stddef.h> 9 #include <linux/kernel.h> 10 #include <linux/smp.h> 11 #include <linux/threads.h> 12 #include <linux/hardirq.h> 13 14 #include <asm/dbell.h> 15 #include <asm/interrupt.h> 16 #include <asm/irq_regs.h> 17 #include <asm/kvm_ppc.h> 18 #include <asm/trace.h> 19 20 #ifdef CONFIG_SMP 21 22 DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception) 23 { 24 struct pt_regs *old_regs = set_irq_regs(regs); 25 26 trace_doorbell_entry(regs); 27 28 ppc_msgsync(); 29 30 if (should_hard_irq_enable()) 31 do_hard_irq_enable(); 32 33 kvmppc_clear_host_ipi(smp_processor_id()); 34 __this_cpu_inc(irq_stat.doorbell_irqs); 35 36 smp_ipi_demux_relaxed(); /* already performed the barrier */ 37 38 trace_doorbell_exit(regs); 39 40 set_irq_regs(old_regs); 41 } 42 #else /* CONFIG_SMP */ 43 DEFINE_INTERRUPT_HANDLER_ASYNC(doorbell_exception) 44 { 45 printk(KERN_WARNING "Received doorbell on non-smp system\n"); 46 } 47 #endif /* CONFIG_SMP */ 48