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[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>
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Thomas Mingarelli
Wim Van Sebroeck
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2 changed files with 128 additions and 15 deletions
84
Documentation/watchdog/hpwdt.txt
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84
Documentation/watchdog/hpwdt.txt
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@ -0,0 +1,84 @@
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Last reviewed: 06/02/2009
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HP iLO2 NMI Watchdog Driver
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NMI sourcing for iLO2 based ProLiant Servers
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Documentation and Driver by
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Thomas Mingarelli <thomas.mingarelli@hp.com>
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The HP iLO2 NMI Watchdog driver is a kernel module that provides basic
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watchdog functionality and the added benefit of NMI sourcing. Both the
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watchdog functionality and the NMI sourcing capability need to be enabled
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by the user. Remember that the two modes are not dependant on one another.
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A user can have the NMI sourcing without the watchdog timer and vice-versa.
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Watchdog functionality is enabled like any other common watchdog driver. That
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is, an application needs to be started that kicks off the watchdog timer. A
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basic application exists in the Documentation/watchdog/src directory called
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watchdog-test.c. Simply compile the C file and kick it off. If the system
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gets into a bad state and hangs, the HP ProLiant iLO 2 timer register will
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not be updated in a timely fashion and a hardware system reset (also known as
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an Automatic Server Recovery (ASR)) event will occur.
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The hpwdt driver also has three (3) module parameters. They are the following:
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soft_margin - allows the user to set the watchdog timer value
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allow_kdump - allows the user to save off a kernel dump image after an NMI
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nowayout - basic watchdog parameter that does not allow the timer to
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be restarted or an impending ASR to be escaped.
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NOTE: More information about watchdog drivers in general, including the ioctl
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interface to /dev/watchdog can be found in
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Documentation/watchdog/watchdog-api.txt and Documentation/IPMI.txt.
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The NMI sourcing capability is disabled when the driver discovers that the
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nmi_watchdog is turned on (nmi_watchdog = 1). This is due to the inability to
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distinguish between "NMI Watchdog Ticks" and "HW generated NMI events" in the
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Linux kernel. What this means is that the hpwdt nmi handler code is called
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each time the NMI signal fires off. This could amount to several thousands of
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NMIs in a matter of seconds. If a user sees the Linux kernel's "dazed and
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confused" message in the logs or if the system gets into a hung state, then
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the user should reboot with nmi_watchdog=0.
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1. If the kernel has not been booted with nmi_watchdog turned off then
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edit /boot/grub/menu.lst and place the nmi_watchdog=0 at the end of the
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currently booting kernel line.
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2. reboot the sever
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Now, the hpwdt can successfully receive and source the NMI and provide a log
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message that details the reason for the NMI (as determined by the HP BIOS).
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Below is a list of NMIs the HP BIOS understands along with the associated
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code (reason):
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No source found 00h
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Uncorrectable Memory Error 01h
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ASR NMI 1Bh
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PCI Parity Error 20h
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NMI Button Press 27h
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SB_BUS_NMI 28h
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ILO Doorbell NMI 29h
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ILO IOP NMI 2Ah
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ILO Watchdog NMI 2Bh
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Proc Throt NMI 2Ch
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Front Side Bus NMI 2Dh
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PCI Express Error 2Fh
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DMA controller NMI 30h
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Hypertransport/CSI Error 31h
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-- Tom Mingarelli
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(thomas.mingarelli@hp.com)
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@ -19,6 +19,7 @@
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/nmi.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/mm.h>
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@ -47,7 +48,7 @@
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#define PCI_BIOS32_PARAGRAPH_LEN 16
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#define PCI_ROM_BASE1 0x000F0000
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#define ROM_SIZE 0x10000
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#define HPWDT_VERSION "1.01"
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#define HPWDT_VERSION "1.1.1"
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struct bios32_service_dir {
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u32 signature;
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@ -119,6 +120,7 @@ static int nowayout = WATCHDOG_NOWAYOUT;
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static char expect_release;
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static unsigned long hpwdt_is_open;
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static unsigned int allow_kdump;
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static int hpwdt_nmi_sourcing;
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static void __iomem *pci_mem_addr; /* the PCI-memory address */
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static unsigned long __iomem *hpwdt_timer_reg;
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@ -468,21 +470,22 @@ static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
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if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
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return NOTIFY_OK;
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spin_lock_irqsave(&rom_lock, rom_pl);
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if (!die_nmi_called)
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asminline_call(&cmn_regs, cru_rom_addr);
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die_nmi_called = 1;
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spin_unlock_irqrestore(&rom_lock, rom_pl);
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if (cmn_regs.u1.ral == 0) {
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printk(KERN_WARNING "hpwdt: An NMI occurred, "
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"but unable to determine source.\n");
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} else {
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if (allow_kdump)
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hpwdt_stop();
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panic("An NMI occurred, please see the Integrated "
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"Management Log for details.\n");
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if (hpwdt_nmi_sourcing) {
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spin_lock_irqsave(&rom_lock, rom_pl);
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if (!die_nmi_called)
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asminline_call(&cmn_regs, cru_rom_addr);
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die_nmi_called = 1;
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spin_unlock_irqrestore(&rom_lock, rom_pl);
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if (cmn_regs.u1.ral == 0) {
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printk(KERN_WARNING "hpwdt: An NMI occurred, "
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"but unable to determine source.\n");
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} else {
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if (allow_kdump)
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hpwdt_stop();
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panic("An NMI occurred, please see the Integrated "
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"Management Log for details.\n");
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}
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}
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return NOTIFY_OK;
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}
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@ -627,11 +630,37 @@ static struct notifier_block die_notifier = {
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* Init & Exit
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*/
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#ifdef ARCH_HAS_NMI_WATCHDOG
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static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
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{
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/*
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* If nmi_watchdog is turned off then we can turn on
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* our nmi sourcing capability.
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*/
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if (!nmi_watchdog_active())
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hpwdt_nmi_sourcing = 1;
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else
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dev_warn(&dev->dev, "NMI sourcing is disabled. To enable this "
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"functionality you must reboot with nmi_watchdog=0.\n");
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}
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#else
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static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
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{
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dev_warn(&dev->dev, "NMI sourcing is disabled. "
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"Your kernel does not support a NMI Watchdog.\n");
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}
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#endif
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static int __devinit hpwdt_init_one(struct pci_dev *dev,
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const struct pci_device_id *ent)
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{
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int retval;
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/*
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* Check if we can do NMI sourcing or not
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*/
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hpwdt_check_nmi_sourcing(dev);
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/*
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* First let's find out if we are on an iLO2 server. We will
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* not run on a legacy ASM box.
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