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author | Don Zickus <dzickus@redhat.com> | 2006-09-26 10:52:27 +0200 |
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committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:27 +0200 |
commit | 407984f1af259b31957c7c05075a454a751bb801 (patch) | |
tree | 1e9318b4255957c27a4dbacd84711604bf789393 /arch/x86_64 | |
parent | 2fbe7b25c8edaf2d10e6c1a4cc9f8afe714c4764 (diff) | |
download | op-kernel-dev-407984f1af259b31957c7c05075a454a751bb801.zip op-kernel-dev-407984f1af259b31957c7c05075a454a751bb801.tar.gz |
[PATCH] x86: Add abilty to enable/disable nmi watchdog with sysctl
Adds a new /proc/sys/kernel/nmi call that will enable/disable the nmi
watchdog.
Signed-off-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64')
-rw-r--r-- | arch/x86_64/kernel/nmi.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c index 9d175dc..3a17411 100644 --- a/arch/x86_64/kernel/nmi.c +++ b/arch/x86_64/kernel/nmi.c @@ -750,6 +750,54 @@ static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu) return 0; } +/* + * proc handler for /proc/sys/kernel/nmi + */ +int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, + void __user *buffer, size_t *length, loff_t *ppos) +{ + int old_state; + + nmi_watchdog_enabled = (atomic_read(&nmi_active) > 0) ? 1 : 0; + old_state = nmi_watchdog_enabled; + proc_dointvec(table, write, file, buffer, length, ppos); + if (!!old_state == !!nmi_watchdog_enabled) + return 0; + + if (atomic_read(&nmi_active) < 0) { + printk( KERN_WARNING "NMI watchdog is permanently disabled\n"); + return -EINVAL; + } + + /* if nmi_watchdog is not set yet, then set it */ + nmi_watchdog_default(); + + if (nmi_watchdog == NMI_LOCAL_APIC) + { + if (nmi_watchdog_enabled) + enable_lapic_nmi_watchdog(); + else + disable_lapic_nmi_watchdog(); + } else if (nmi_watchdog == NMI_IO_APIC) { + /* FIXME + * for some reason these functions don't work + */ + printk("Can not enable/disable NMI on IO APIC\n"); + return -EIO; +#if 0 + if (nmi_watchdog_enabled) + enable_timer_nmi_watchdog(); + else + disable_timer_nmi_watchdog(); +#endif + } else { + printk(KERN_WARNING + "NMI watchdog doesn't know what hardware to touch\n"); + return -EIO; + } + return 0; +} + #endif EXPORT_SYMBOL(nmi_active); |