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

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  1 /*
  2  * Copyright (C) 2012 ARM Ltd.
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11  * GNU General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public License
 14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 15  */
 16 #ifndef __ASM_SMP_H
 17 #define __ASM_SMP_H
 18 
 19 #include <linux/const.h>
 20 
 21 /* Values for secondary_data.status */
 22 #define CPU_STUCK_REASON_SHIFT          (8)
 23 #define CPU_BOOT_STATUS_MASK            ((UL(1) << CPU_STUCK_REASON_SHIFT) - 1)
 24 
 25 #define CPU_MMU_OFF                     (-1)
 26 #define CPU_BOOT_SUCCESS                (0)
 27 /* The cpu invoked ops->cpu_die, synchronise it with cpu_kill */
 28 #define CPU_KILL_ME                     (1)
 29 /* The cpu couldn't die gracefully and is looping in the kernel */
 30 #define CPU_STUCK_IN_KERNEL             (2)
 31 /* Fatal system error detected by secondary CPU, crash the system */
 32 #define CPU_PANIC_KERNEL                (3)
 33 
 34 #define CPU_STUCK_REASON_52_BIT_VA      (UL(1) << CPU_STUCK_REASON_SHIFT)
 35 #define CPU_STUCK_REASON_NO_GRAN        (UL(2) << CPU_STUCK_REASON_SHIFT)
 36 
 37 #ifndef __ASSEMBLY__
 38 
 39 #include <asm/percpu.h>
 40 
 41 #include <linux/threads.h>
 42 #include <linux/cpumask.h>
 43 #include <linux/thread_info.h>
 44 
 45 DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
 46 
 47 /*
 48  * We don't use this_cpu_read(cpu_number) as that has implicit writes to
 49  * preempt_count, and associated (compiler) barriers, that we'd like to avoid
 50  * the expense of. If we're preemptible, the value can be stale at use anyway.
 51  * And we can't use this_cpu_ptr() either, as that winds up recursing back
 52  * here under CONFIG_DEBUG_PREEMPT=y.
 53  */
 54 #define raw_smp_processor_id() (*raw_cpu_ptr(&cpu_number))
 55 
 56 struct seq_file;
 57 
 58 /*
 59  * generate IPI list text
 60  */
 61 extern void show_ipi_list(struct seq_file *p, int prec);
 62 
 63 /*
 64  * Called from C code, this handles an IPI.
 65  */
 66 extern void handle_IPI(int ipinr, struct pt_regs *regs);
 67 
 68 /*
 69  * Discover the set of possible CPUs and determine their
 70  * SMP operations.
 71  */
 72 extern void smp_init_cpus(void);
 73 
 74 /*
 75  * Provide a function to raise an IPI cross call on CPUs in callmap.
 76  */
 77 extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
 78 
 79 extern void (*__smp_cross_call)(const struct cpumask *, unsigned int);
 80 
 81 /*
 82  * Called from the secondary holding pen, this is the secondary CPU entry point.
 83  */
 84 asmlinkage void secondary_start_kernel(void);
 85 
 86 /*
 87  * Initial data for bringing up a secondary CPU.
 88  * @stack  - sp for the secondary CPU
 89  * @status - Result passed back from the secondary CPU to
 90  *           indicate failure.
 91  */
 92 struct secondary_data {
 93         void *stack;
 94         struct task_struct *task;
 95         long status;
 96 };
 97 
 98 extern struct secondary_data secondary_data;
 99 extern long __early_cpu_boot_status;
100 extern void secondary_entry(void);
101 
102 extern void arch_send_call_function_single_ipi(int cpu);
103 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
104 
105 #ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
106 extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
107 #else
108 static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
109 {
110         BUILD_BUG();
111 }
112 #endif
113 
114 extern int __cpu_disable(void);
115 
116 extern void __cpu_die(unsigned int cpu);
117 extern void cpu_die(void);
118 extern void cpu_die_early(void);
119 
120 static inline void cpu_park_loop(void)
121 {
122         for (;;) {
123                 wfe();
124                 wfi();
125         }
126 }
127 
128 static inline void update_cpu_boot_status(int val)
129 {
130         WRITE_ONCE(secondary_data.status, val);
131         /* Ensure the visibility of the status update */
132         dsb(ishst);
133 }
134 
135 /*
136  * The calling secondary CPU has detected serious configuration mismatch,
137  * which calls for a kernel panic. Update the boot status and park the calling
138  * CPU.
139  */
140 static inline void cpu_panic_kernel(void)
141 {
142         update_cpu_boot_status(CPU_PANIC_KERNEL);
143         cpu_park_loop();
144 }
145 
146 /*
147  * If a secondary CPU enters the kernel but fails to come online,
148  * (e.g. due to mismatched features), and cannot exit the kernel,
149  * we increment cpus_stuck_in_kernel and leave the CPU in a
150  * quiesecent loop within the kernel text. The memory containing
151  * this loop must not be re-used for anything else as the 'stuck'
152  * core is executing it.
153  *
154  * This function is used to inhibit features like kexec and hibernate.
155  */
156 bool cpus_are_stuck_in_kernel(void);
157 
158 extern void crash_smp_send_stop(void);
159 extern bool smp_crash_stop_failed(void);
160 
161 #endif /* ifndef __ASSEMBLY__ */
162 
163 #endif /* ifndef __ASM_SMP_H */
164 

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