#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/nmi.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#define PCI_BIOS32_PARAGRAPH_LEN 16
#define PCI_ROM_BASE1 0x000F0000
#define ROM_SIZE 0x10000
-#define HPWDT_VERSION "1.01"
+#define HPWDT_VERSION "1.1.1"
struct bios32_service_dir {
u32 signature;
static char expect_release;
static unsigned long hpwdt_is_open;
static unsigned int allow_kdump;
+static unsigned int hpwdt_nmi_sourcing;
+static unsigned int priority; /* hpwdt at end of die_notify list */
static void __iomem *pci_mem_addr; /* the PCI-memory address */
static unsigned long __iomem *hpwdt_timer_reg;
};
MODULE_DEVICE_TABLE(pci, hpwdt_devices);
-extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
+extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
+ unsigned long *pRomEntry);
#ifndef CONFIG_X86_64
/* --32 Bit Bios------------------------------------------------------------ */
* This function checks whether or not a SMBIOS/DMI record is
* the 64bit CRU info or not
*/
-static void __devinit dmi_find_cru(const struct dmi_header *dm)
+static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
{
struct smbios_cru64_info *smbios_cru64_ptr;
unsigned long cru_physical_address;
{
cru_rom_addr = NULL;
- dmi_walk(dmi_find_cru);
+ dmi_walk(dmi_find_cru, NULL);
/* if cru_rom_addr has been set then we found a CRU service */
return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
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");
+ if (hpwdt_nmi_sourcing) {
+ 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_OK;
}
/*
* Kernel interfaces
*/
-static struct file_operations hpwdt_fops = {
+static const struct file_operations hpwdt_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = hpwdt_write,
static struct notifier_block die_notifier = {
.notifier_call = hpwdt_pretimeout,
- .priority = 0x7FFFFFFF,
+ .priority = 0,
};
/*
* Init & Exit
*/
+#ifdef ARCH_HAS_NMI_WATCHDOG
+static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
+{
+ /*
+ * If nmi_watchdog is turned off then we can turn on
+ * our nmi sourcing capability.
+ */
+ if (!nmi_watchdog_active())
+ hpwdt_nmi_sourcing = 1;
+ else
+ dev_warn(&dev->dev, "NMI sourcing is disabled. To enable this "
+ "functionality you must reboot with nmi_watchdog=0 "
+ "and load the hpwdt driver with priority=1.\n");
+}
+#else
+static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
+{
+ dev_warn(&dev->dev, "NMI sourcing is disabled. "
+ "Your kernel does not support a NMI Watchdog.\n");
+}
+#endif
+
static int __devinit hpwdt_init_one(struct pci_dev *dev,
const struct pci_device_id *ent)
{
int retval;
/*
+ * Check if we can do NMI sourcing or not
+ */
+ hpwdt_check_nmi_sourcing(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.
cmn_regs.u1.rah = 0x0D;
cmn_regs.u1.ral = 0x02;
+ /*
+ * If the priority is set to 1, then we will be put first on the
+ * die notify list to handle a critical NMI. The default is to
+ * be last so other users of the NMI signal can function.
+ */
+ if (priority)
+ die_notifier.priority = 0x7FFFFFFF;
+
retval = register_die_notifier(&die_notifier);
if (retval != 0) {
dev_warn(&dev->dev,
printk(KERN_INFO
"hp Watchdog Timer Driver: %s"
", timer margin: %d seconds (nowayout=%d)"
- ", allow kernel dump: %s (default = 0/OFF).\n",
+ ", allow kernel dump: %s (default = 0/OFF)"
+ ", priority: %s (default = 0/LAST).\n",
HPWDT_VERSION, soft_margin, nowayout,
- (allow_kdump == 0) ? "OFF" : "ON");
+ (allow_kdump == 0) ? "OFF" : "ON",
+ (priority == 0) ? "LAST" : "FIRST");
return 0;
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+module_param(priority, int, 0);
+MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
+ " (default = 0/Last)\n");
+
module_init(hpwdt_init);
module_exit(hpwdt_cleanup);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff