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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1943f53c9c
PSW restart can be triggered on offline CPUs. If this happens, currently the PSW restart code fails, because functions like smp_processor_id() do not work on offline CPUs. This patch fixes this as follows: If PSW restart is triggered on an offline CPU, the PSW restart (sigp restart) is done a second time on another CPU that is online and the old CPU is stopped afterwards. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Copyright IBM Corp. 1999,2009
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* Author(s): Denis Joseph Barrow,
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* Martin Schwidefsky <schwidefsky@de.ibm.com>,
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* Heiko Carstens <heiko.carstens@de.ibm.com>,
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*/
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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#ifdef CONFIG_SMP
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#include <asm/system.h>
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#include <asm/sigp.h>
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extern void machine_restart_smp(char *);
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extern void machine_halt_smp(void);
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extern void machine_power_off_smp(void);
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#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
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extern int __cpu_disable (void);
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extern void __cpu_die (unsigned int cpu);
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extern int __cpu_up (unsigned int cpu);
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extern struct mutex smp_cpu_state_mutex;
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extern int smp_cpu_polarization[];
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
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extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *);
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extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp,
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int from, int to);
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extern void smp_restart_with_online_cpu(void);
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extern void smp_restart_cpu(void);
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/*
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* returns 1 if (virtual) cpu is scheduled
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* returns 0 otherwise
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*/
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static inline int smp_vcpu_scheduled(int cpu)
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{
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u32 status;
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switch (sigp_ps(&status, 0, cpu, sigp_sense_running)) {
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case sigp_status_stored:
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/* Check for running status */
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if (status & 0x400)
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return 0;
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break;
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case sigp_not_operational:
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return 0;
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default:
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break;
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}
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return 1;
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}
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#else /* CONFIG_SMP */
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static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
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{
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func(data);
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}
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static inline void smp_restart_with_online_cpu(void)
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{
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}
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#define smp_vcpu_scheduled (1)
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_HOTPLUG_CPU
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extern int smp_rescan_cpus(void);
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extern void __noreturn cpu_die(void);
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#else
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static inline int smp_rescan_cpus(void) { return 0; }
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static inline void cpu_die(void) { }
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#endif
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#endif /* __ASM_SMP_H */
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