v4.19.13 snapshot.
diff --git a/arch/powerpc/include/asm/dbell.h b/arch/powerpc/include/asm/dbell.h
new file mode 100644
index 0000000..99b84db
--- /dev/null
+++ b/arch/powerpc/include/asm/dbell.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2009 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * provides masks and opcode images for use by code generation, emulation
+ * and for instructions that older assemblers might not know about
+ */
+#ifndef _ASM_POWERPC_DBELL_H
+#define _ASM_POWERPC_DBELL_H
+
+#include <linux/smp.h>
+#include <linux/threads.h>
+
+#include <asm/ppc-opcode.h>
+#include <asm/feature-fixups.h>
+
+#define PPC_DBELL_MSG_BRDCAST (0x04000000)
+#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
+#define PPC_DBELL_TYPE_MASK PPC_DBELL_TYPE(0xf)
+#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
+#define PPC_DBELL_PIR_MASK 0x3fff
+enum ppc_dbell {
+ PPC_DBELL = 0, /* doorbell */
+ PPC_DBELL_CRIT = 1, /* critical doorbell */
+ PPC_G_DBELL = 2, /* guest doorbell */
+ PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
+ PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
+ PPC_DBELL_SERVER = 5, /* doorbell on server */
+};
+
+#ifdef CONFIG_PPC_BOOK3S
+
+#define PPC_DBELL_MSGTYPE PPC_DBELL_SERVER
+
+static inline void _ppc_msgsnd(u32 msg)
+{
+ __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0)
+ : : "i" (CPU_FTR_HVMODE), "r" (msg));
+}
+
+/* sync before sending message */
+static inline void ppc_msgsnd_sync(void)
+{
+ __asm__ __volatile__ ("sync" : : : "memory");
+}
+
+/* sync after taking message interrupt */
+static inline void ppc_msgsync(void)
+{
+ /* sync is not required when taking messages from the same core */
+ __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSYNC " ; lwsync", "", %0)
+ : : "i" (CPU_FTR_HVMODE|CPU_FTR_ARCH_300));
+}
+
+static inline void _ppc_msgclr(u32 msg)
+{
+ __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGCLR(%1), PPC_MSGCLRP(%1), %0)
+ : : "i" (CPU_FTR_HVMODE), "r" (msg));
+}
+
+static inline void ppc_msgclr(enum ppc_dbell type)
+{
+ u32 msg = PPC_DBELL_TYPE(type);
+
+ _ppc_msgclr(msg);
+}
+
+#else /* CONFIG_PPC_BOOK3S */
+
+#define PPC_DBELL_MSGTYPE PPC_DBELL
+
+static inline void _ppc_msgsnd(u32 msg)
+{
+ __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
+}
+
+/* sync before sending message */
+static inline void ppc_msgsnd_sync(void)
+{
+ __asm__ __volatile__ ("sync" : : : "memory");
+}
+
+/* sync after taking message interrupt */
+static inline void ppc_msgsync(void)
+{
+}
+
+#endif /* CONFIG_PPC_BOOK3S */
+
+extern void doorbell_global_ipi(int cpu);
+extern void doorbell_core_ipi(int cpu);
+extern int doorbell_try_core_ipi(int cpu);
+extern void doorbell_exception(struct pt_regs *regs);
+
+static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
+{
+ u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
+ (tag & 0x07ffffff);
+
+ _ppc_msgsnd(msg);
+}
+
+#endif /* _ASM_POWERPC_DBELL_H */