[WATCHDOG] hpwdt.c kdebug support

add kdebug support for the hpwdt.c driver.
Signed-off-by: NThomas Mingarelli <Thomas.Mingarelli@hp.com>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

drivers/watchdog/hpwdt.c

@@ -116,6 +116,7 @@ static unsigned int reload;			/* the computed soft_margin */
 static int nowayout = WATCHDOG_NOWAYOUT;
 static char expect_release;
 static unsigned long hpwdt_is_open;
+static unsigned int allow_kdump;
 
 static void __iomem *pci_mem_addr;		/* the PCI-memory address */
 static unsigned long __iomem *hpwdt_timer_reg;
@@ -356,7 +357,6 @@ asm(".text                      \n\t"
     "call       *%r12           \n\t"
     "pushfq                     \n\t"
     "popq        %r12           \n\t"
-    "popfq                      \n\t"
     "movl       %eax, (%r9)     \n\t"
     "movl       %ebx, 4(%r9)    \n\t"
     "movl       %ecx, 8(%r9)    \n\t"
@@ -405,41 +405,13 @@ static int __devinit detect_cru_service(void)
 	dmi_walk(dmi_find_cru);
 
 	/* if cru_rom_addr has been set then we found a CRU service */
-	return ((cru_rom_addr != NULL) ? 0: -ENODEV);
+	return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
 }
 
 /* ------------------------------------------------------------------------- */
 
 #endif
 
-/*
- *	NMI Handler
- */
-static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
-			    void *data)
-{
-	unsigned long rom_pl;
-	static int die_nmi_called;
-
-	if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
-		return NOTIFY_OK;
-
-	spin_lock_irqsave(&rom_lock, rom_pl);
-	if (!die_nmi_called)
-		asminline_call(&cmn_regs, cru_rom_addr);
-	die_nmi_called = 1;
-	spin_unlock_irqrestore(&rom_lock, rom_pl);
-	if (cmn_regs.u1.ral == 0) {
-		printk(KERN_WARNING "hpwdt: An NMI occurred, "
-		       "but unable to determine source.\n");
-	} else {
-		panic("An NMI occurred, please see the Integrated "
-			"Management Log for details.\n");
-	}
-
-	return NOTIFY_STOP;
-}
-
 /*
  *	Watchdog operations
  */
@@ -483,6 +455,36 @@ static int hpwdt_change_timer(int new_margin)
 	return 0;
 }
 
+/*
+ *	NMI Handler
+ */
+static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
+				void *data)
+{
+	unsigned long rom_pl;
+	static int die_nmi_called;
+
+	if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
+		return NOTIFY_OK;
+
+	spin_lock_irqsave(&rom_lock, rom_pl);
+	if (!die_nmi_called)
+		asminline_call(&cmn_regs, cru_rom_addr);
+	die_nmi_called = 1;
+	spin_unlock_irqrestore(&rom_lock, rom_pl);
+	if (cmn_regs.u1.ral == 0) {
+		printk(KERN_WARNING "hpwdt: An NMI occurred, "
+			"but unable to determine source.\n");
+	} else {
+		if (allow_kdump)
+			hpwdt_stop();
+		panic("An NMI occurred, please see the Integrated "
+			"Management Log for details.\n");
+	}
+
+	return NOTIFY_STOP;
+}
+
 /*
  *	/dev/watchdog handling
  */
@@ -632,6 +634,7 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
 	/*
 	 * First let's find out if we are on an iLO2 server. We will
 	 * not run on a legacy ASM box.
+	 * So we only support the G5 ProLiant servers and higher.
 	 */
 	if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
 		dev_warn(&dev->dev,
@@ -699,8 +702,9 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
 
 	printk(KERN_INFO
 		"hp Watchdog Timer Driver: 1.00"
-		", timer margin: %d seconds( nowayout=%d).\n",
-		soft_margin, nowayout);
+		", timer margin: %d seconds (nowayout=%d)"
+		", allow kernel dump: %s (default = 0/OFF).\n",
+		soft_margin, nowayout, (allow_kdump == 0) ? "OFF" : "ON");
 
 	return 0;
 
@@ -755,6 +759,9 @@ MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 module_param(soft_margin, int, 0);
 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
 
+module_param(allow_kdump, int, 0);
+MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
+
 module_param(nowayout, int, 0);
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");