[WATCHDOG] hpwdt.c kdebug support

add kdebug support for the hpwdt.c driver.

Signed-off-by: Thomas Mingarelli <Thomas.Mingarelli@hp.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index d039d5f..a3765e0 100644 (file)
--- a/drivers/watchdog/hpwdt.c
+++ b/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;
@@ -221,19 +222,19 @@ static int __devinit cru_detect(unsigned long map_entry,
 
        if (cmn_regs.u1.ral != 0) {
                printk(KERN_WARNING
-                      "hpwdt: Call succeeded but with an error: 0x%x\n",
-                      cmn_regs.u1.ral);
+                       "hpwdt: Call succeeded but with an error: 0x%x\n",
+                       cmn_regs.u1.ral);
        } else {
                physical_bios_base = cmn_regs.u2.rebx;
                physical_bios_offset = cmn_regs.u4.redx;
                cru_length = cmn_regs.u3.recx;
                cru_physical_address =
-                   physical_bios_base + physical_bios_offset;
+                       physical_bios_base + physical_bios_offset;
 
                /* If the values look OK, then map it in. */
                if ((physical_bios_base + physical_bios_offset)) {
                        cru_rom_addr =
-                           ioremap(cru_physical_address, cru_length);
+                               ioremap(cru_physical_address, cru_length);
                        if (cru_rom_addr)
                                retval = 0;
                }
@@ -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"
@@ -390,10 +390,10 @@ static void __devinit dmi_find_cru(const struct dmi_header *dm)
                smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
                if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
                        cru_physical_address =
-                           smbios_cru64_ptr->physical_address +
-                           smbios_cru64_ptr->double_offset;
+                               smbios_cru64_ptr->physical_address +
+                               smbios_cru64_ptr->double_offset;
                        cru_rom_addr = ioremap(cru_physical_address,
-                                   smbios_cru64_ptr->double_length);
+                               smbios_cru64_ptr->double_length);
                }
        }
 }
@@ -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
  */
@@ -625,17 +627,18 @@ static struct notifier_block die_notifier = {
  */
 
 static int __devinit hpwdt_init_one(struct pci_dev *dev,
-                                   const struct pci_device_id *ent)
+                                       const struct pci_device_id *ent)
 {
        int retval;
 
        /*
         * 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,
-                      "This server does not have an iLO2 ASIC.\n");
+                       "This server does not have an iLO2 ASIC.\n");
                return -ENODEV;
        }
 
@@ -669,7 +672,7 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
        retval = detect_cru_service();
        if (retval < 0) {
                dev_warn(&dev->dev,
-                      "Unable to detect the %d Bit CRU Service.\n",
+                       "Unable to detect the %d Bit CRU Service.\n",
                        HPWDT_ARCH);
                goto error_get_cru;
        }
@@ -684,7 +687,7 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
        retval = register_die_notifier(&die_notifier);
        if (retval != 0) {
                dev_warn(&dev->dev,
-                      "Unable to register a die notifier (err=%d).\n",
+                       "Unable to register a die notifier (err=%d).\n",
                        retval);
                goto error_die_notifier;
        }
@@ -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) ")");