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-rw-r--r--arch/riscv/include/asm/cpu_ops.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/cpu_ops.h b/arch/riscv/include/asm/cpu_ops.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ * Based on arch/arm64/include/asm/cpu_ops.h
+ */
+#ifndef __ASM_CPU_OPS_H
+#define __ASM_CPU_OPS_H
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/threads.h>
+
+/**
+ * struct cpu_operations - Callback operations for hotplugging CPUs.
+ *
+ * @name: Name of the boot protocol.
+ * @cpu_prepare: Early one-time preparation step for a cpu. If there
+ * is a mechanism for doing so, tests whether it is
+ * possible to boot the given HART.
+ * @cpu_start: Boots a cpu into the kernel.
+ * @cpu_disable: Prepares a cpu to die. May fail for some
+ * mechanism-specific reason, which will cause the hot
+ * unplug to be aborted. Called from the cpu to be killed.
+ * @cpu_stop: Makes a cpu leave the kernel. Must not fail. Called from
+ * the cpu being stopped.
+ * @cpu_is_stopped: Ensures a cpu has left the kernel. Called from another
+ * cpu.
+ */
+struct cpu_operations {
+ const char *name;
+ int (*cpu_prepare)(unsigned int cpu);
+ int (*cpu_start)(unsigned int cpu,
+ struct task_struct *tidle);
+#ifdef CONFIG_HOTPLUG_CPU
+ int (*cpu_disable)(unsigned int cpu);
+ void (*cpu_stop)(void);
+ int (*cpu_is_stopped)(unsigned int cpu);
+#endif
+};
+
+extern const struct cpu_operations *cpu_ops[NR_CPUS];
+void __init cpu_set_ops(int cpu);
+void cpu_update_secondary_bootdata(unsigned int cpuid,
+ struct task_struct *tidle);
+
+#endif /* ifndef __ASM_CPU_OPS_H */