1 files changed, 47 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c
new file mode 100644
index 000000000..5712dd846
--- /dev/null
+++ b/arch/powerpc/kernel/dbell.c
@@ -0,0 +1,47 @@
+// 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 */