[WATCHDOG] hpwdt: Add NMI sourcing

Add NMI sourcing functionality (Can only be active if nmi_watchdog is
inactive).

Signed-off-by: Thomas Mingarelli <thomas.mingarelli@hp.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Thomas Mingarelli 2009-06-04 19:50:45 +00:00 committed by Wim Van Sebroeck
parent 55e8ddecec
commit 47bece87b1
2 changed files with 128 additions and 15 deletions

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@ -0,0 +1,84 @@
Last reviewed: 06/02/2009
HP iLO2 NMI Watchdog Driver
NMI sourcing for iLO2 based ProLiant Servers
Documentation and Driver by
Thomas Mingarelli <thomas.mingarelli@hp.com>
The HP iLO2 NMI Watchdog driver is a kernel module that provides basic
watchdog functionality and the added benefit of NMI sourcing. Both the
watchdog functionality and the NMI sourcing capability need to be enabled
by the user. Remember that the two modes are not dependant on one another.
A user can have the NMI sourcing without the watchdog timer and vice-versa.
Watchdog functionality is enabled like any other common watchdog driver. That
is, an application needs to be started that kicks off the watchdog timer. A
basic application exists in the Documentation/watchdog/src directory called
watchdog-test.c. Simply compile the C file and kick it off. If the system
gets into a bad state and hangs, the HP ProLiant iLO 2 timer register will
not be updated in a timely fashion and a hardware system reset (also known as
an Automatic Server Recovery (ASR)) event will occur.
The hpwdt driver also has three (3) module parameters. They are the following:
soft_margin - allows the user to set the watchdog timer value
allow_kdump - allows the user to save off a kernel dump image after an NMI
nowayout - basic watchdog parameter that does not allow the timer to
be restarted or an impending ASR to be escaped.
NOTE: More information about watchdog drivers in general, including the ioctl
interface to /dev/watchdog can be found in
Documentation/watchdog/watchdog-api.txt and Documentation/IPMI.txt.
The NMI sourcing capability is disabled when the driver discovers that the
nmi_watchdog is turned on (nmi_watchdog = 1). This is due to the inability to
distinguish between "NMI Watchdog Ticks" and "HW generated NMI events" in the
Linux kernel. What this means is that the hpwdt nmi handler code is called
each time the NMI signal fires off. This could amount to several thousands of
NMIs in a matter of seconds. If a user sees the Linux kernel's "dazed and
confused" message in the logs or if the system gets into a hung state, then
the user should reboot with nmi_watchdog=0.
1. If the kernel has not been booted with nmi_watchdog turned off then
edit /boot/grub/menu.lst and place the nmi_watchdog=0 at the end of the
currently booting kernel line.
2. reboot the sever
Now, the hpwdt can successfully receive and source the NMI and provide a log
message that details the reason for the NMI (as determined by the HP BIOS).
Below is a list of NMIs the HP BIOS understands along with the associated
code (reason):
No source found 00h
Uncorrectable Memory Error 01h
ASR NMI 1Bh
PCI Parity Error 20h
NMI Button Press 27h
SB_BUS_NMI 28h
ILO Doorbell NMI 29h
ILO IOP NMI 2Ah
ILO Watchdog NMI 2Bh
Proc Throt NMI 2Ch
Front Side Bus NMI 2Dh
PCI Express Error 2Fh
DMA controller NMI 30h
Hypertransport/CSI Error 31h
-- Tom Mingarelli
(thomas.mingarelli@hp.com)

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@ -19,6 +19,7 @@
#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>
@ -47,7 +48,7 @@
#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;
@ -119,6 +120,7 @@ static int nowayout = WATCHDOG_NOWAYOUT;
static char expect_release;
static unsigned long hpwdt_is_open;
static unsigned int allow_kdump;
static int hpwdt_nmi_sourcing;
static void __iomem *pci_mem_addr; /* the PCI-memory address */
static unsigned long __iomem *hpwdt_timer_reg;
@ -468,21 +470,22 @@ static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
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;
}
@ -627,11 +630,37 @@ static struct notifier_block die_notifier = {
* 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.\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.