]> pilppa.com Git - linux-2.6-omap-h63xx.git/commitdiff
[PATCH] x86: Add abilty to enable/disable nmi watchdog with sysctl
authorDon Zickus <dzickus@redhat.com>
Tue, 26 Sep 2006 08:52:27 +0000 (10:52 +0200)
committerAndi Kleen <andi@basil.nowhere.org>
Tue, 26 Sep 2006 08:52:27 +0000 (10:52 +0200)
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>
arch/i386/kernel/nmi.c
arch/x86_64/kernel/nmi.c
include/asm-i386/nmi.h
include/asm-x86_64/nmi.h
include/linux/sysctl.h
kernel/sysctl.c

index acd3fdea2a21402ca62b63f93df780a5d470b935..28065d0b71a99ee29fb031869dbff156d7b189bd 100644 (file)
@@ -846,6 +846,58 @@ static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu)
        return 0;
 }
 
+/*
+ * proc handler for /proc/sys/kernel/nmi_watchdog
+ */
+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 == NMI_DEFAULT) {
+               if (nmi_known_cpu() > 0)
+                       nmi_watchdog = NMI_LOCAL_APIC;
+               else
+                       nmi_watchdog = NMI_IO_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");
+               return -EIO;
+       }
+       return 0;
+}
+
 #endif
 
 EXPORT_SYMBOL(nmi_active);
index 9d175dcf3a2d49a213ee759ce7b8b3d0ac9d0676..3a17411a9a19cfa9eb4331f38e7734e436663e8a 100644 (file)
@@ -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);
index 34d6bf063b6eded65e59f91711e449f1728669be..13b5d8311bf7ec1fad09d8c82af1a0b1095ccda3 100644 (file)
@@ -14,6 +14,7 @@
  */
 int do_nmi_callback(struct pt_regs *regs, int cpu);
 
+extern int nmi_watchdog_enabled;
 extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
 extern int avail_to_resrv_perfctr_nmi(unsigned int);
 extern int reserve_perfctr_nmi(unsigned int);
index 8818c39d34e0727e5e711e49ddd47b63c7e7a3d1..2c23b0df87d2ad102043e974428bfab81ba0f70d 100644 (file)
@@ -43,6 +43,7 @@ extern void die_nmi(char *str, struct pt_regs *regs);
 
 extern int panic_on_timeout;
 extern int unknown_nmi_panic;
+extern int nmi_watchdog_enabled;
 
 extern int check_nmi_watchdog(void);
 extern int avail_to_resrv_perfctr_nmi_bit(unsigned int);
index 736ed917a4f8df2af5d25e1e8cc567cada1d863d..ecb79ba52ae19b235758ff06a9af62c642cae3ae 100644 (file)
@@ -150,6 +150,7 @@ enum
        KERN_IA64_UNALIGNED=72, /* int: ia64 unaligned userland trap enable */
        KERN_COMPAT_LOG=73,     /* int: print compat layer  messages */
        KERN_MAX_LOCK_DEPTH=74,
+       KERN_NMI_WATCHDOG=75, /* int: enable/disable nmi watchdog */
 };
 
 
index 83f168361624d53c197b8e86c2a7495d4e9a8304..040de6bd74dd8cb527d1ef1544cb3d9b45eacbb8 100644 (file)
@@ -76,6 +76,9 @@ extern int compat_log;
 
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 int unknown_nmi_panic;
+int nmi_watchdog_enabled;
+extern int proc_nmi_enabled(struct ctl_table *, int , struct file *,
+                       void __user *, size_t *, loff_t *);
 #endif
 
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
@@ -628,6 +631,14 @@ static ctl_table kern_table[] = {
                .mode           = 0644,
                .proc_handler   = &proc_dointvec,
        },
+       {
+               .ctl_name       = KERN_NMI_WATCHDOG,
+               .procname       = "nmi_watchdog",
+               .data           = &nmi_watchdog_enabled,
+               .maxlen         = sizeof (int),
+               .mode           = 0644,
+               .proc_handler   = &proc_nmi_enabled,
+       },
 #endif
 #if defined(CONFIG_X86)
        {