1 files changed, 149 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
new file mode 100644
index 000000000..9b31e6d0d
--- /dev/null
+++ b/arch/arm64/include/asm/smp.h
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ */
+#ifndef __ASM_SMP_H
+#define __ASM_SMP_H
+
+#include <linux/const.h>
+
+/* Values for secondary_data.status */
+#define CPU_STUCK_REASON_SHIFT		(8)
+#define CPU_BOOT_STATUS_MASK		((UL(1) << CPU_STUCK_REASON_SHIFT) - 1)
+
+#define CPU_MMU_OFF			(-1)
+#define CPU_BOOT_SUCCESS		(0)
+/* The cpu invoked ops->cpu_die, synchronise it with cpu_kill */
+#define CPU_KILL_ME			(1)
+/* The cpu couldn't die gracefully and is looping in the kernel */
+#define CPU_STUCK_IN_KERNEL		(2)
+/* Fatal system error detected by secondary CPU, crash the system */
+#define CPU_PANIC_KERNEL		(3)
+
+#define CPU_STUCK_REASON_52_BIT_VA	(UL(1) << CPU_STUCK_REASON_SHIFT)
+#define CPU_STUCK_REASON_NO_GRAN	(UL(2) << CPU_STUCK_REASON_SHIFT)
+
+#ifndef __ASSEMBLY__
+
+#include <asm/percpu.h>
+
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/thread_info.h>
+
+DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
+
+/*
+ * We don't use this_cpu_read(cpu_number) as that has implicit writes to
+ * preempt_count, and associated (compiler) barriers, that we'd like to avoid
+ * the expense of. If we're preemptible, the value can be stale at use anyway.
+ * And we can't use this_cpu_ptr() either, as that winds up recursing back
+ * here under CONFIG_DEBUG_PREEMPT=y.
+ */
+#define raw_smp_processor_id() (*raw_cpu_ptr(&cpu_number))
+
+/*
+ * Logical CPU mapping.
+ */
+extern u64 __cpu_logical_map[NR_CPUS];
+extern u64 cpu_logical_map(unsigned int cpu);
+
+static inline void set_cpu_logical_map(unsigned int cpu, u64 hwid)
+{
+	__cpu_logical_map[cpu] = hwid;
+}
+
+struct seq_file;
+
+/*
+ * Discover the set of possible CPUs and determine their
+ * SMP operations.
+ */
+extern void smp_init_cpus(void);
+
+/*
+ * Register IPI interrupts with the arch SMP code
+ */
+extern void set_smp_ipi_range(int ipi_base, int nr_ipi);
+
+/*
+ * Called from the secondary holding pen, this is the secondary CPU entry point.
+ */
+asmlinkage void secondary_start_kernel(void);
+
+/*
+ * Initial data for bringing up a secondary CPU.
+ * @status - Result passed back from the secondary CPU to
+ *           indicate failure.
+ */
+struct secondary_data {
+	struct task_struct *task;
+	long status;
+};
+
+extern struct secondary_data secondary_data;
+extern long __early_cpu_boot_status;
+extern void secondary_entry(void);
+
+extern void arch_send_call_function_single_ipi(int cpu);
+extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
+
+#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
+extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
+#else
+static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
+{
+	BUILD_BUG();
+}
+#endif
+
+extern int __cpu_disable(void);
+
+static inline void __cpu_die(unsigned int cpu) { }
+extern void __noreturn cpu_die(void);
+extern void __noreturn cpu_die_early(void);
+
+static inline void __noreturn cpu_park_loop(void)
+{
+	for (;;) {
+		wfe();
+		wfi();
+	}
+}
+
+static inline void update_cpu_boot_status(int val)
+{
+	WRITE_ONCE(secondary_data.status, val);
+	/* Ensure the visibility of the status update */
+	dsb(ishst);
+}
+
+/*
+ * The calling secondary CPU has detected serious configuration mismatch,
+ * which calls for a kernel panic. Update the boot status and park the calling
+ * CPU.
+ */
+static inline void __noreturn cpu_panic_kernel(void)
+{
+	update_cpu_boot_status(CPU_PANIC_KERNEL);
+	cpu_park_loop();
+}
+
+/*
+ * If a secondary CPU enters the kernel but fails to come online,
+ * (e.g. due to mismatched features), and cannot exit the kernel,
+ * we increment cpus_stuck_in_kernel and leave the CPU in a
+ * quiesecent loop within the kernel text. The memory containing
+ * this loop must not be re-used for anything else as the 'stuck'
+ * core is executing it.
+ *
+ * This function is used to inhibit features like kexec and hibernate.
+ */
+bool cpus_are_stuck_in_kernel(void);
+
+extern void crash_smp_send_stop(void);
+extern bool smp_crash_stop_failed(void);
+
+#endif /* ifndef __ASSEMBLY__ */
+
+#endif /* ifndef __ASM_SMP_H */