From e33e89ab1a8d295de0500b697f4f31c3ceee9aa2 Mon Sep 17 00:00:00 2001 From: Don Zickus Date: Tue, 26 Sep 2006 10:52:27 +0200 Subject: [PATCH] x86: Add abilty to enable/disable nmi watchdog from procfs (update) Adds a new /proc/sys/kernel/nmi_watchdog call that will enable/disable the nmi watchdog. By entering a non-zero value here, a user can enable the nmi watchdog to monitor the online cpus in the system. By entering a zero value here, a user can disable the nmi watchdog and free up a performance counter which could then be utilized by the oprofile subsystem, otherwise oprofile may be short a counter when in use. Signed-off-by: Don Zickus Signed-off-by: Andi Kleen Cc: Andi Kleen Signed-off-by: Andrew Morton --- arch/i386/kernel/nmi.c | 21 ++++----------------- arch/x86_64/kernel/nmi.c | 21 ++++----------------- 2 files changed, 8 insertions(+), 34 deletions(-) (limited to 'arch') diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c index 28065d0b71a9..6241e4448cab 100644 --- a/arch/i386/kernel/nmi.c +++ b/arch/i386/kernel/nmi.c @@ -847,7 +847,7 @@ static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu) } /* - * proc handler for /proc/sys/kernel/nmi_watchdog + * 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) @@ -861,8 +861,8 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, return 0; if (atomic_read(&nmi_active) < 0) { - printk(KERN_WARNING "NMI watchdog is permanently disabled\n"); - return -EINVAL; + printk( KERN_WARNING "NMI watchdog is permanently disabled\n"); + return -EIO; } if (nmi_watchdog == NMI_DEFAULT) { @@ -872,24 +872,11 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, nmi_watchdog = NMI_IO_APIC; } - if (nmi_watchdog == NMI_LOCAL_APIC) - { + 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 -EINVAL; -#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"); diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c index 3a17411a9a19..dd57410dad51 100644 --- a/arch/x86_64/kernel/nmi.c +++ b/arch/x86_64/kernel/nmi.c @@ -167,7 +167,7 @@ static __cpuinit inline int nmi_known_cpu(void) } /* Run after command line and cpu_init init, but before all other checks */ -void __cpuinit nmi_watchdog_default(void) +void nmi_watchdog_default(void) { if (nmi_watchdog != NMI_DEFAULT) return; @@ -766,32 +766,19 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, if (atomic_read(&nmi_active) < 0) { printk( KERN_WARNING "NMI watchdog is permanently disabled\n"); - return -EINVAL; + return -EIO; } /* if nmi_watchdog is not set yet, then set it */ nmi_watchdog_default(); - if (nmi_watchdog == NMI_LOCAL_APIC) - { + 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 + printk( KERN_WARNING "NMI watchdog doesn't know what hardware to touch\n"); return -EIO; } -- cgit v1.2.2