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Linux/arch/arm64/include/asm/smp.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * Copyright (C) 2012 ARM Ltd.
  4  */
  5 #ifndef __ASM_SMP_H
  6 #define __ASM_SMP_H
  7 
  8 #include <linux/const.h>
  9 
 10 /* Values for secondary_data.status */
 11 #define CPU_STUCK_REASON_SHIFT          (8)
 12 #define CPU_BOOT_STATUS_MASK            ((UL(1) << CPU_STUCK_REASON_SHIFT) - 1)
 13 
 14 #define CPU_MMU_OFF                     (-1)
 15 #define CPU_BOOT_SUCCESS                (0)
 16 /* The cpu invoked ops->cpu_die, synchronise it with cpu_kill */
 17 #define CPU_KILL_ME                     (1)
 18 /* The cpu couldn't die gracefully and is looping in the kernel */
 19 #define CPU_STUCK_IN_KERNEL             (2)
 20 /* Fatal system error detected by secondary CPU, crash the system */
 21 #define CPU_PANIC_KERNEL                (3)
 22 
 23 #define CPU_STUCK_REASON_52_BIT_VA      (UL(1) << CPU_STUCK_REASON_SHIFT)
 24 #define CPU_STUCK_REASON_NO_GRAN        (UL(2) << CPU_STUCK_REASON_SHIFT)
 25 
 26 #ifndef __ASSEMBLY__
 27 
 28 #include <asm/percpu.h>
 29 
 30 #include <linux/threads.h>
 31 #include <linux/cpumask.h>
 32 #include <linux/thread_info.h>
 33 
 34 DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
 35 
 36 /*
 37  * We don't use this_cpu_read(cpu_number) as that has implicit writes to
 38  * preempt_count, and associated (compiler) barriers, that we'd like to avoid
 39  * the expense of. If we're preemptible, the value can be stale at use anyway.
 40  * And we can't use this_cpu_ptr() either, as that winds up recursing back
 41  * here under CONFIG_DEBUG_PREEMPT=y.
 42  */
 43 #define raw_smp_processor_id() (*raw_cpu_ptr(&cpu_number))
 44 
 45 /*
 46  * Logical CPU mapping.
 47  */
 48 extern u64 __cpu_logical_map[NR_CPUS];
 49 #define cpu_logical_map(cpu)    __cpu_logical_map[cpu]
 50 
 51 struct seq_file;
 52 
 53 /*
 54  * generate IPI list text
 55  */
 56 extern void show_ipi_list(struct seq_file *p, int prec);
 57 
 58 /*
 59  * Called from C code, this handles an IPI.
 60  */
 61 extern void handle_IPI(int ipinr, struct pt_regs *regs);
 62 
 63 /*
 64  * Discover the set of possible CPUs and determine their
 65  * SMP operations.
 66  */
 67 extern void smp_init_cpus(void);
 68 
 69 /*
 70  * Provide a function to raise an IPI cross call on CPUs in callmap.
 71  */
 72 extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
 73 
 74 extern void (*__smp_cross_call)(const struct cpumask *, unsigned int);
 75 
 76 /*
 77  * Called from the secondary holding pen, this is the secondary CPU entry point.
 78  */
 79 asmlinkage void secondary_start_kernel(void);
 80 
 81 /*
 82  * Initial data for bringing up a secondary CPU.
 83  * @stack  - sp for the secondary CPU
 84  * @status - Result passed back from the secondary CPU to
 85  *           indicate failure.
 86  */
 87 struct secondary_data {
 88         void *stack;
 89         struct task_struct *task;
 90         long status;
 91 };
 92 
 93 extern struct secondary_data secondary_data;
 94 extern long __early_cpu_boot_status;
 95 extern void secondary_entry(void);
 96 
 97 extern void arch_send_call_function_single_ipi(int cpu);
 98 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
 99 
100 #ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
101 extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
102 #else
103 static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
104 {
105         BUILD_BUG();
106 }
107 #endif
108 
109 extern int __cpu_disable(void);
110 
111 extern void __cpu_die(unsigned int cpu);
112 extern void cpu_die(void);
113 extern void cpu_die_early(void);
114 
115 static inline void cpu_park_loop(void)
116 {
117         for (;;) {
118                 wfe();
119                 wfi();
120         }
121 }
122 
123 static inline void update_cpu_boot_status(int val)
124 {
125         WRITE_ONCE(secondary_data.status, val);
126         /* Ensure the visibility of the status update */
127         dsb(ishst);
128 }
129 
130 /*
131  * The calling secondary CPU has detected serious configuration mismatch,
132  * which calls for a kernel panic. Update the boot status and park the calling
133  * CPU.
134  */
135 static inline void cpu_panic_kernel(void)
136 {
137         update_cpu_boot_status(CPU_PANIC_KERNEL);
138         cpu_park_loop();
139 }
140 
141 /*
142  * If a secondary CPU enters the kernel but fails to come online,
143  * (e.g. due to mismatched features), and cannot exit the kernel,
144  * we increment cpus_stuck_in_kernel and leave the CPU in a
145  * quiesecent loop within the kernel text. The memory containing
146  * this loop must not be re-used for anything else as the 'stuck'
147  * core is executing it.
148  *
149  * This function is used to inhibit features like kexec and hibernate.
150  */
151 bool cpus_are_stuck_in_kernel(void);
152 
153 extern void crash_smp_send_stop(void);
154 extern bool smp_crash_stop_failed(void);
155 
156 #endif /* ifndef __ASSEMBLY__ */
157 
158 #endif /* ifndef __ASM_SMP_H */
159 

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