Revert "ipmi: add new IPMI nmi watchdog handling"

This reverts commit f64da95.

Andi Kleen is unhappy with the changes, and they really do not seem
worth it.  IPMI could use DIE_NMI_IPI instead of the new callback, even
though that ends up having its own set of problems too, mainly because
the IPMI code cannot really know the NMI was from IPMI or not.

Manually fix up conflicts in arch/x86_64/kernel/traps.c and
drivers/char/ipmi/ipmi_watchdog.c.

Cc: Andi Kleen <ak@suse.de>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Corey Minyard <minyard@acm.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/i386/kernel/traps.c

@@ -733,11 +733,6 @@ static __kprobes void default_do_nmi(struct pt_regs * regs)
 		 */
 		if (nmi_watchdog_tick(regs, reason))
 			return;
-#endif
-		if (notify_die(DIE_NMI_POST, "nmi_post", regs, reason, 2, 0)
-							== NOTIFY_STOP)
-			return;
-#ifdef CONFIG_X86_LOCAL_APIC
 		if (!do_nmi_callback(regs, smp_processor_id()))
 #endif
 			unknown_nmi_error(reason, regs);

arch/x86_64/kernel/traps.c

@@ -776,9 +776,6 @@ asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs)
 		 */
 		if (nmi_watchdog_tick(regs,reason))
 			return;
-		if (notify_die(DIE_NMI_POST, "nmi_post", regs, reason, 2, 0)
-								== NOTIFY_STOP)
-			return;
 		if (!do_nmi_callback(regs,cpu))
 			unknown_nmi_error(reason, regs);
 

drivers/char/ipmi/ipmi_watchdog.c

@@ -50,18 +50,10 @@
 #include <linux/poll.h>
 #include <linux/string.h>
 #include <linux/ctype.h>
-#include <linux/delay.h>
 #include <asm/atomic.h>
 
-#ifdef CONFIG_X86
-/* This is ugly, but I've determined that x86 is the only architecture
-   that can reasonably support the IPMI NMI watchdog timeout at this
-   time.  If another architecture adds this capability somehow, it
-   will have to be a somewhat different mechanism and I have no idea
-   how it will work.  So in the unlikely event that another
-   architecture supports this, we can figure out a good generic
-   mechanism for it at that time. */
-#define HAVE_DIE_NMI_POST
+#ifdef CONFIG_X86_LOCAL_APIC
+#include <asm/apic.h>
 #endif
 
 #define	PFX "IPMI Watchdog: "
@@ -327,11 +319,6 @@ static unsigned char ipmi_version_minor;
 /* If a pretimeout occurs, this is used to allow only one panic to happen. */
 static atomic_t preop_panic_excl = ATOMIC_INIT(-1);
 
-#ifdef HAVE_DIE_NMI_POST
-static int testing_nmi;
-static int nmi_handler_registered;
-#endif
-
 static int ipmi_heartbeat(void);
 static void panic_halt_ipmi_heartbeat(void);
 
@@ -373,10 +360,6 @@ static int i_ipmi_set_timeout(struct ipmi_smi_msg  *smi_msg,
 	int                               hbnow = 0;
 
 
-	/* These can be cleared as we are setting the timeout. */
-	ipmi_start_timer_on_heartbeat = 0;
-	pretimeout_since_last_heartbeat = 0;
-
 	data[0] = 0;
 	WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
 
@@ -451,12 +434,13 @@ static int ipmi_set_timeout(int do_heartbeat)
 
 	wait_for_completion(&set_timeout_wait);
 
-	mutex_unlock(&set_timeout_lock);
-
 	if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB)
 	    || ((send_heartbeat_now)
 		&& (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY)))
+	{
 		rv = ipmi_heartbeat();
+	}
+	mutex_unlock(&set_timeout_lock);
 
 out:
 	return rv;
@@ -536,17 +520,20 @@ static int ipmi_heartbeat(void)
 	int                               rv;
 	struct ipmi_system_interface_addr addr;
 
-	if (ipmi_ignore_heartbeat)
+	if (ipmi_ignore_heartbeat) {
 		return 0;
+	}
 
 	if (ipmi_start_timer_on_heartbeat) {
+		ipmi_start_timer_on_heartbeat = 0;
 		ipmi_watchdog_state = action_val;
 		return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
 	} else if (pretimeout_since_last_heartbeat) {
 		/* A pretimeout occurred, make sure we set the timeout.
 		   We don't want to set the action, though, we want to
 		   leave that alone (thus it can't be combined with the
 		   above operation. */
+		pretimeout_since_last_heartbeat = 0;
 		return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
 	}
 
@@ -934,45 +921,6 @@ static void ipmi_register_watchdog(int ipmi_intf)
 		printk(KERN_CRIT PFX "Unable to register misc device\n");
 	}
 
-#ifdef HAVE_DIE_NMI_POST
-	if (nmi_handler_registered) {
-		int old_pretimeout = pretimeout;
-		int old_timeout = timeout;
-		int old_preop_val = preop_val;
-
-		/* Set the pretimeout to go off in a second and give
-		   ourselves plenty of time to stop the timer. */
-		ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
-		preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */
-		pretimeout = 99;
-		timeout = 100;
-
-		testing_nmi = 1;
-
-		rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
-		if (rv) {
-			printk(KERN_WARNING PFX "Error starting timer to"
-			       " test NMI: 0x%x.  The NMI pretimeout will"
-			       " likely not work\n", rv);
-			rv = 0;
-			goto out_restore;
-		}
-
-		msleep(1500);
-
-		if (testing_nmi != 2) {
-			printk(KERN_WARNING PFX "IPMI NMI didn't seem to"
-			       " occur.  The NMI pretimeout will"
-			       " likely not work\n");
-		}
-	out_restore:
-		testing_nmi = 0;
-		preop_val = old_preop_val;
-		pretimeout = old_pretimeout;
-		timeout = old_timeout;
-	}
-#endif
-
  out:
 	up_write(&register_sem);
 
@@ -982,10 +930,6 @@ static void ipmi_register_watchdog(int ipmi_intf)
 		ipmi_watchdog_state = action_val;
 		ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
 		printk(KERN_INFO PFX "Starting now!\n");
-	} else {
-		/* Stop the timer now. */
-		ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
-		ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
 	}
 }
 
@@ -1022,28 +966,17 @@ static void ipmi_unregister_watchdog(int ipmi_intf)
 	up_write(&register_sem);
 }
 
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
 static int
-ipmi_nmi(struct notifier_block *self, unsigned long val, void *data)
+ipmi_nmi(void *dev_id, int cpu, int handled)
 {
-	if (val != DIE_NMI_POST)
-		return NOTIFY_OK;
-
-	if (testing_nmi) {
-		testing_nmi = 2;
-		return NOTIFY_STOP;
-	}
-
         /* If we are not expecting a timeout, ignore it. */
 	if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
-		return NOTIFY_OK;
-
-	if (preaction_val != WDOG_PRETIMEOUT_NMI)
-		return NOTIFY_OK;
+		return NOTIFY_DONE;
 
 	/* If no one else handled the NMI, we assume it was the IPMI
            watchdog. */
-	if (preop_val == WDOG_PREOP_PANIC) {
+	if ((!handled) && (preop_val == WDOG_PREOP_PANIC)) {
 		/* On some machines, the heartbeat will give
 		   an error and not work unless we re-enable
 		   the timer.   So do so. */
@@ -1052,12 +985,18 @@ ipmi_nmi(struct notifier_block *self, unsigned long val, void *data)
 			panic(PFX "pre-timeout");
 	}
 
-	return NOTIFY_STOP;
+	return NOTIFY_DONE;
 }
 
-static struct notifier_block ipmi_nmi_handler = {
-	.notifier_call = ipmi_nmi
+static struct nmi_handler ipmi_nmi_handler =
+{
+	.link     = LIST_HEAD_INIT(ipmi_nmi_handler.link),
+	.dev_name = "ipmi_watchdog",
+	.dev_id   = NULL,
+	.handler  = ipmi_nmi,
+	.priority = 0, /* Call us last. */
 };
+int nmi_handler_registered;
 #endif
 
 static int wdog_reboot_handler(struct notifier_block *this,
@@ -1174,7 +1113,7 @@ static int preaction_op(const char *inval, char *outval)
 		preaction_val = WDOG_PRETIMEOUT_NONE;
 	else if (strcmp(inval, "pre_smi") == 0)
 		preaction_val = WDOG_PRETIMEOUT_SMI;
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
 	else if (strcmp(inval, "pre_nmi") == 0)
 		preaction_val = WDOG_PRETIMEOUT_NMI;
 #endif
@@ -1208,7 +1147,7 @@ static int preop_op(const char *inval, char *outval)
 
 static void check_parms(void)
 {
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
 	int do_nmi = 0;
 	int rv;
 
@@ -1221,17 +1160,28 @@ static void check_parms(void)
 			preop_op("preop_none", NULL);
 			do_nmi = 0;
 		}
+#ifdef CONFIG_X86_LOCAL_APIC
+		if (nmi_watchdog == NMI_IO_APIC) {
+			printk(KERN_WARNING PFX "nmi_watchdog is set to IO APIC"
+			       " mode (value is %d), that is incompatible"
+			       " with using NMI in the IPMI watchdog."
+			       " Disabling IPMI nmi pretimeout.\n",
+			       nmi_watchdog);
+			preaction_val = WDOG_PRETIMEOUT_NONE;
+			do_nmi = 0;
+		}
+#endif
 	}
 	if (do_nmi && !nmi_handler_registered) {
-		rv = register_die_notifier(&ipmi_nmi_handler);
+		rv = request_nmi(&ipmi_nmi_handler);
 		if (rv) {
 			printk(KERN_WARNING PFX
 			       "Can't register nmi handler\n");
 			return;
 		} else
 			nmi_handler_registered = 1;
 	} else if (!do_nmi && nmi_handler_registered) {
-		unregister_die_notifier(&ipmi_nmi_handler);
+		release_nmi(&ipmi_nmi_handler);
 		nmi_handler_registered = 0;
 	}
 #endif
@@ -1267,9 +1217,9 @@ static int __init ipmi_wdog_init(void)
 
 	rv = ipmi_smi_watcher_register(&smi_watcher);
 	if (rv) {
-#ifdef HAVE_DIE_NMI_POST
-		if (nmi_handler_registered)
-			unregister_die_notifier(&ipmi_nmi_handler);
+#ifdef HAVE_NMI_HANDLER
+		if (preaction_val == WDOG_PRETIMEOUT_NMI)
+			release_nmi(&ipmi_nmi_handler);
 #endif
 		atomic_notifier_chain_unregister(&panic_notifier_list,
 						 &wdog_panic_notifier);
@@ -1288,9 +1238,9 @@ static void __exit ipmi_wdog_exit(void)
 	ipmi_smi_watcher_unregister(&smi_watcher);
 	ipmi_unregister_watchdog(watchdog_ifnum);
 
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
 	if (nmi_handler_registered)
-		unregister_die_notifier(&ipmi_nmi_handler);
+		release_nmi(&ipmi_nmi_handler);
 #endif
 
 	atomic_notifier_chain_unregister(&panic_notifier_list,

include/asm-i386/kdebug.h

@@ -27,7 +27,6 @@ enum die_val {
 	DIE_GPF,
 	DIE_CALL,
 	DIE_NMI_IPI,
-	DIE_NMI_POST,
 	DIE_PAGE_FAULT,
 };
 

include/asm-x86_64/kdebug.h

@@ -22,7 +22,6 @@ enum die_val {
 	DIE_GPF,
 	DIE_CALL,
 	DIE_NMI_IPI,
-	DIE_NMI_POST,
 	DIE_PAGE_FAULT,
 };