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47cab6a722
As Andrew noted, my previous patch ("debug lockups: Improve lockup
detection") broke/removed SysRq-L support from architecture that do
not provide a __trigger_all_cpu_backtrace implementation.
Restore a fallback path and clean up the SysRq-L machinery a bit:
- Rename the arch method to arch_trigger_all_cpu_backtrace()
- Simplify the define
- Document the method a bit - in the hope of more architectures
adding support for it.
[ The patch touches Sparc code for the rename. ]
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "David S. Miller" <davem@davemloft.net>
LKML-Reference: <20090802140809.7ec4bb6b.akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
#ifndef _ASM_X86_NMI_H
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#define _ASM_X86_NMI_H
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#include <linux/pm.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#ifdef ARCH_HAS_NMI_WATCHDOG
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/**
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* do_nmi_callback
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*
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* Check to see if a callback exists and execute it. Return 1
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* if the handler exists and was handled successfully.
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*/
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int do_nmi_callback(struct pt_regs *regs, int cpu);
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extern void die_nmi(char *str, struct pt_regs *regs, int do_panic);
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extern int check_nmi_watchdog(void);
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extern int nmi_watchdog_enabled;
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extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
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extern int avail_to_resrv_perfctr_nmi(unsigned int);
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extern int reserve_perfctr_nmi(unsigned int);
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extern void release_perfctr_nmi(unsigned int);
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extern int reserve_evntsel_nmi(unsigned int);
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extern void release_evntsel_nmi(unsigned int);
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extern void setup_apic_nmi_watchdog(void *);
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extern void stop_apic_nmi_watchdog(void *);
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extern void disable_timer_nmi_watchdog(void);
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extern void enable_timer_nmi_watchdog(void);
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extern int nmi_watchdog_tick(struct pt_regs *regs, unsigned reason);
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extern void cpu_nmi_set_wd_enabled(void);
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extern atomic_t nmi_active;
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extern unsigned int nmi_watchdog;
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#define NMI_NONE 0
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#define NMI_IO_APIC 1
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#define NMI_LOCAL_APIC 2
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#define NMI_INVALID 3
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struct ctl_table;
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struct file;
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extern int proc_nmi_enabled(struct ctl_table *, int , struct file *,
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void __user *, size_t *, loff_t *);
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extern int unknown_nmi_panic;
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void arch_trigger_all_cpu_backtrace(void);
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#define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
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static inline void localise_nmi_watchdog(void)
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{
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if (nmi_watchdog == NMI_IO_APIC)
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nmi_watchdog = NMI_LOCAL_APIC;
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}
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/* check if nmi_watchdog is active (ie was specified at boot) */
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static inline int nmi_watchdog_active(void)
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{
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/*
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* actually it should be:
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* return (nmi_watchdog == NMI_LOCAL_APIC ||
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* nmi_watchdog == NMI_IO_APIC)
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* but since they are power of two we could use a
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* cheaper way --cvg
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*/
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return nmi_watchdog & (NMI_LOCAL_APIC | NMI_IO_APIC);
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}
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#endif
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void lapic_watchdog_stop(void);
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int lapic_watchdog_init(unsigned nmi_hz);
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int lapic_wd_event(unsigned nmi_hz);
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unsigned lapic_adjust_nmi_hz(unsigned hz);
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void disable_lapic_nmi_watchdog(void);
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void enable_lapic_nmi_watchdog(void);
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void stop_nmi(void);
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void restart_nmi(void);
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#endif /* _ASM_X86_NMI_H */
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