1 files changed, 128 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
new file mode 100644
index 000000000..0d555847c
--- /dev/null
+++ b/arch/riscv/include/asm/smp.h
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_SMP_H
+#define _ASM_RISCV_SMP_H
+
+#include <linux/cpumask.h>
+#include <linux/irqreturn.h>
+#include <linux/thread_info.h>
+
+#define INVALID_HARTID ULONG_MAX
+
+struct seq_file;
+extern unsigned long boot_cpu_hartid;
+
+#ifdef CONFIG_SMP
+
+#include <linux/jump_label.h>
+
+/*
+ * Mapping between linux logical cpu index and hartid.
+ */
+extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
+#define cpuid_to_hartid_map(cpu)    __cpuid_to_hartid_map[cpu]
+
+/* print IPI stats */
+void show_ipi_stats(struct seq_file *p, int prec);
+
+/* SMP initialization hook for setup_arch */
+void __init setup_smp(void);
+
+/* Hook for the generic smp_call_function_many() routine. */
+void arch_send_call_function_ipi_mask(struct cpumask *mask);
+
+/* Hook for the generic smp_call_function_single() routine. */
+void arch_send_call_function_single_ipi(int cpu);
+
+int riscv_hartid_to_cpuid(unsigned long hartid);
+
+/* Enable IPI for CPU hotplug */
+void riscv_ipi_enable(void);
+
+/* Disable IPI for CPU hotplug */
+void riscv_ipi_disable(void);
+
+/* Check if IPI interrupt numbers are available */
+bool riscv_ipi_have_virq_range(void);
+
+/* Set the IPI interrupt numbers for arch (called by irqchip drivers) */
+void riscv_ipi_set_virq_range(int virq, int nr, bool use_for_rfence);
+
+/* Check if we can use IPIs for remote FENCEs */
+DECLARE_STATIC_KEY_FALSE(riscv_ipi_for_rfence);
+#define riscv_use_ipi_for_rfence() \
+	static_branch_unlikely(&riscv_ipi_for_rfence)
+
+/* Check other CPUs stop or not */
+bool smp_crash_stop_failed(void);
+
+/* Secondary hart entry */
+asmlinkage void smp_callin(void);
+
+/*
+ * Obtains the hart ID of the currently executing task.  This relies on
+ * THREAD_INFO_IN_TASK, but we define that unconditionally.
+ */
+#define raw_smp_processor_id() (current_thread_info()->cpu)
+
+#if defined CONFIG_HOTPLUG_CPU
+int __cpu_disable(void);
+static inline void __cpu_die(unsigned int cpu) { }
+#endif /* CONFIG_HOTPLUG_CPU */
+
+#else
+
+static inline void show_ipi_stats(struct seq_file *p, int prec)
+{
+}
+
+static inline int riscv_hartid_to_cpuid(unsigned long hartid)
+{
+	if (hartid == boot_cpu_hartid)
+		return 0;
+
+	return -1;
+}
+static inline unsigned long cpuid_to_hartid_map(int cpu)
+{
+	return boot_cpu_hartid;
+}
+
+static inline void riscv_ipi_enable(void)
+{
+}
+
+static inline void riscv_ipi_disable(void)
+{
+}
+
+static inline bool riscv_ipi_have_virq_range(void)
+{
+	return false;
+}
+
+static inline void riscv_ipi_set_virq_range(int virq, int nr,
+					    bool use_for_rfence)
+{
+}
+
+static inline bool riscv_use_ipi_for_rfence(void)
+{
+	return false;
+}
+
+#endif /* CONFIG_SMP */
+
+#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
+bool cpu_has_hotplug(unsigned int cpu);
+#else
+static inline bool cpu_has_hotplug(unsigned int cpu)
+{
+	return false;
+}
+#endif
+
+#endif /* _ASM_RISCV_SMP_H */