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Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog

Browse source 
* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  watchdog: hpwdt (12/12): Make NMI decoding a compile-time option
  watchdog: hpwdt (11/12): move NMI-decoding init and exit to seperate functions
  watchdog: hpwdt (10/12): Use "decoding" instead of "sourcing"
  watchdog: hpwdt (9/12): hpwdt_pretimeout reorganization
  watchdog: hpwdt (8/12): implement WDIOC_GETTIMELEFT
  watchdog: hpwdt (7/12): allow full range of timer values supported by hardware
  watchdog: hpwdt (6/12): Introduce SECS_TO_TICKS() macro
  watchdog: hpwdt (5/12): Make x86 assembly ifdef guard more strict
  watchdog: hpwdt (4/12): Despecificate driver from iLO2
  watchdog: hpwdt (3/12): Group NMI sourcing specific items together
  watchdog: hpwdt (2/12): Group options that affect watchdog behavior together
  watchdog: hpwdt (1/12): clean-up include-files.
This commit is contained in:
Linus Torvalds 2010-08-13 17:58:54 -07:00
commit 7ec3fa1f4a
2 changed files with 185 additions and 138 deletions
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19
drivers/watchdog/Kconfig
View file

@ -574,16 +574,21 @@ config IT87_WDT
be called it87_wdt.
config HP_WATCHDOG
tristate "HP Proliant iLO 2 Hardware Watchdog Timer"
tristate "HP Proliant iLO2+ Hardware Watchdog Timer"
depends on X86
help
A software monitoring watchdog and NMI sourcing driver. This driver
will detect lockups and provide stack trace. Also, when an NMI
occurs this driver will make the necessary BIOS calls to log
the cause of the NMI. This is a driver that will only load on a
HP ProLiant system with a minimum of iLO2 support.
To compile this driver as a module, choose M here: the
module will be called hpwdt.
will detect lockups and provide a stack trace. This is a driver that
will only load on a HP ProLiant system with a minimum of iLO2 support.
To compile this driver as a module, choose M here: the module will be
called hpwdt.
config HPWDT_NMI_DECODING
bool "NMI decoding support for the HP ProLiant iLO2+ Hardware Watchdog Timer"
depends on HP_WATCHDOG
help
When an NMI occurs this feature will make the necessary BIOS calls to
log the cause of the NMI.
config SC1200_WDT
tristate "National Semiconductor PC87307/PC97307 (ala SC1200) Watchdog"

304
drivers/watchdog/hpwdt.c
View file

@ -16,38 +16,55 @@
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/nmi.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/kdebug.h>
#include <linux/moduleparam.h>
#include <linux/notifier.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/reboot.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/watchdog.h>
#ifdef CONFIG_HPWDT_NMI_DECODING
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/string.h>
#include <linux/bootmem.h>
#include <asm/desc.h>
#include <linux/spinlock.h>
#include <linux/nmi.h>
#include <linux/kdebug.h>
#include <linux/notifier.h>
#include <asm/cacheflush.h>
#endif /* CONFIG_HPWDT_NMI_DECODING */
#define HPWDT_VERSION "1.2.0"
#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
#define DEFAULT_MARGIN 30
static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
static unsigned int reload; /* the computed soft_margin */
static int nowayout = WATCHDOG_NOWAYOUT;
static char expect_release;
static unsigned long hpwdt_is_open;
static void __iomem *pci_mem_addr; /* the PCI-memory address */
static unsigned long __iomem *hpwdt_timer_reg;
static unsigned long __iomem *hpwdt_timer_con;
static struct pci_device_id hpwdt_devices[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */
{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */
{0}, /* terminate list */
};
MODULE_DEVICE_TABLE(pci, hpwdt_devices);
#ifdef CONFIG_HPWDT_NMI_DECODING
#define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */
#define CRU_BIOS_SIGNATURE_VALUE 0x55524324
#define PCI_BIOS32_PARAGRAPH_LEN 16
#define PCI_ROM_BASE1 0x000F0000
#define ROM_SIZE 0x10000
#define HPWDT_VERSION "1.1.1"
struct bios32_service_dir {
u32 signature;
@ -112,37 +129,17 @@ struct cmn_registers {
u32 reflags;
} __attribute__((packed));
#define DEFAULT_MARGIN 30
static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
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 hpwdt_nmi_decoding;
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;
static unsigned long __iomem *hpwdt_timer_con;
static DEFINE_SPINLOCK(rom_lock);
static void *cru_rom_addr;
static struct cmn_registers cmn_regs;
static struct pci_device_id hpwdt_devices[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
{0}, /* terminate list */
};
MODULE_DEVICE_TABLE(pci, hpwdt_devices);
extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
unsigned long *pRomEntry);
#ifndef CONFIG_X86_64
#ifdef CONFIG_X86_32
/* --32 Bit Bios------------------------------------------------------------ */
#define HPWDT_ARCH 32
@ -331,8 +328,9 @@ static int __devinit detect_cru_service(void)
iounmap(p);
return rc;
}
#else
/* ------------------------------------------------------------------------- */
#endif /* CONFIG_X86_32 */
#ifdef CONFIG_X86_64
/* --64 Bit Bios------------------------------------------------------------ */
#define HPWDT_ARCH 64
@ -410,17 +408,16 @@ static int __devinit detect_cru_service(void)
/* if cru_rom_addr has been set then we found a CRU service */
return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
}
/* ------------------------------------------------------------------------- */
#endif
#endif /* CONFIG_X86_64 */
#endif /* CONFIG_HPWDT_NMI_DECODING */
/*
* Watchdog operations
*/
static void hpwdt_start(void)
{
reload = (soft_margin * 1000) / 128;
reload = SECS_TO_TICKS(soft_margin);
iowrite16(reload, hpwdt_timer_reg);
iowrite16(0x85, hpwdt_timer_con);
}
@ -441,8 +438,7 @@ static void hpwdt_ping(void)
static int hpwdt_change_timer(int new_margin)
{
/* Arbitrary, can't find the card's limits */
if (new_margin < 5 || new_margin > 600) {
if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
printk(KERN_WARNING
"hpwdt: New value passed in is invalid: %d seconds.\n",
new_margin);
@ -453,11 +449,17 @@ static int hpwdt_change_timer(int new_margin)
printk(KERN_DEBUG
"hpwdt: New timer passed in is %d seconds.\n",
new_margin);
reload = (soft_margin * 1000) / 128;
reload = SECS_TO_TICKS(soft_margin);
return 0;
}
static int hpwdt_time_left(void)
{
return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
}
#ifdef CONFIG_HPWDT_NMI_DECODING
/*
* NMI Handler
*/
@ -468,26 +470,29 @@ static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
static int die_nmi_called;
if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
return NOTIFY_OK;
goto out;
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");
}
if (!hpwdt_nmi_decoding)
goto out;
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");
}
out:
return NOTIFY_OK;
}
#endif /* CONFIG_HPWDT_NMI_DECODING */
/*
* /dev/watchdog handling
@ -557,7 +562,7 @@ static const struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.identity = "HP iLO2 HW Watchdog Timer",
.identity = "HP iLO2+ HW Watchdog Timer",
};
static long hpwdt_ioctl(struct file *file, unsigned int cmd,
@ -599,6 +604,10 @@ static long hpwdt_ioctl(struct file *file, unsigned int cmd,
case WDIOC_GETTIMEOUT:
ret = put_user(soft_margin, p);
break;
case WDIOC_GETTIMELEFT:
ret = put_user(hpwdt_time_left(), p);
break;
}
return ret;
}
@ -621,79 +630,44 @@ static struct miscdevice hpwdt_miscdev = {
.fops = &hpwdt_fops,
};
#ifdef CONFIG_HPWDT_NMI_DECODING
static struct notifier_block die_notifier = {
.notifier_call = hpwdt_pretimeout,
.priority = 0,
};
#endif /* CONFIG_HPWDT_NMI_DECODING */
/*
* Init & Exit
*/
#ifdef CONFIG_HPWDT_NMI_DECODING
#ifdef ARCH_HAS_NMI_WATCHDOG
static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
{
/*
* If nmi_watchdog is turned off then we can turn on
* our nmi sourcing capability.
* our nmi decoding capability.
*/
if (!nmi_watchdog_active())
hpwdt_nmi_sourcing = 1;
hpwdt_nmi_decoding = 1;
else
dev_warn(&dev->dev, "NMI sourcing is disabled. To enable this "
dev_warn(&dev->dev, "NMI decoding 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)
static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
{
dev_warn(&dev->dev, "NMI sourcing is disabled. "
dev_warn(&dev->dev, "NMI decoding is disabled. "
"Your kernel does not support a NMI Watchdog.\n");
}
#endif
#endif /* ARCH_HAS_NMI_WATCHDOG */
static int __devinit hpwdt_init_one(struct pci_dev *dev,
const struct pci_device_id *ent)
static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
{
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.
*/
if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
dev_warn(&dev->dev,
"This server does not have an iLO2 ASIC.\n");
return -ENODEV;
}
if (pci_enable_device(dev)) {
dev_warn(&dev->dev,
"Not possible to enable PCI Device: 0x%x:0x%x.\n",
ent->vendor, ent->device);
return -ENODEV;
}
pci_mem_addr = pci_iomap(dev, 1, 0x80);
if (!pci_mem_addr) {
dev_warn(&dev->dev,
"Unable to detect the iLO2 server memory.\n");
retval = -ENOMEM;
goto error_pci_iomap;
}
hpwdt_timer_reg = pci_mem_addr + 0x70;
hpwdt_timer_con = pci_mem_addr + 0x72;
/* Make sure that we have a valid soft_margin */
if (hpwdt_change_timer(soft_margin))
hpwdt_change_timer(DEFAULT_MARGIN);
/*
* We need to map the ROM to get the CRU service.
* For 32 bit Operating Systems we need to go through the 32 Bit
@ -705,7 +679,7 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
dev_warn(&dev->dev,
"Unable to detect the %d Bit CRU Service.\n",
HPWDT_ARCH);
goto error_get_cru;
return retval;
}
/*
@ -728,9 +702,87 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
dev_warn(&dev->dev,
"Unable to register a die notifier (err=%d).\n",
retval);
goto error_die_notifier;
if (cru_rom_addr)
iounmap(cru_rom_addr);
}
dev_info(&dev->dev,
"HP Watchdog Timer Driver: NMI decoding initialized"
", allow kernel dump: %s (default = 0/OFF)"
", priority: %s (default = 0/LAST).\n",
(allow_kdump == 0) ? "OFF" : "ON",
(priority == 0) ? "LAST" : "FIRST");
return 0;
}
static void __devexit hpwdt_exit_nmi_decoding(void)
{
unregister_die_notifier(&die_notifier);
if (cru_rom_addr)
iounmap(cru_rom_addr);
}
#else /* !CONFIG_HPWDT_NMI_DECODING */
static void __devinit hpwdt_check_nmi_decoding(struct pci_dev *dev)
{
}
static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev)
{
return 0;
}
static void __devexit hpwdt_exit_nmi_decoding(void)
{
}
#endif /* CONFIG_HPWDT_NMI_DECODING */
static int __devinit hpwdt_init_one(struct pci_dev *dev,
const struct pci_device_id *ent)
{
int retval;
/*
* Check if we can do NMI decoding or not
*/
hpwdt_check_nmi_decoding(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,
"This server does not have an iLO2+ ASIC.\n");
return -ENODEV;
}
if (pci_enable_device(dev)) {
dev_warn(&dev->dev,
"Not possible to enable PCI Device: 0x%x:0x%x.\n",
ent->vendor, ent->device);
return -ENODEV;
}
pci_mem_addr = pci_iomap(dev, 1, 0x80);
if (!pci_mem_addr) {
dev_warn(&dev->dev,
"Unable to detect the iLO2+ server memory.\n");
retval = -ENOMEM;
goto error_pci_iomap;
}
hpwdt_timer_reg = pci_mem_addr + 0x70;
hpwdt_timer_con = pci_mem_addr + 0x72;
/* Make sure that we have a valid soft_margin */
if (hpwdt_change_timer(soft_margin))
hpwdt_change_timer(DEFAULT_MARGIN);
/* Initialize NMI Decoding functionality */
retval = hpwdt_init_nmi_decoding(dev);
if (retval != 0)
goto error_init_nmi_decoding;
retval = misc_register(&hpwdt_miscdev);
if (retval < 0) {
dev_warn(&dev->dev,
@ -739,23 +791,14 @@ static int __devinit hpwdt_init_one(struct pci_dev *dev,
goto error_misc_register;
}
printk(KERN_INFO
"hp Watchdog Timer Driver: %s"
", timer margin: %d seconds (nowayout=%d)"
", allow kernel dump: %s (default = 0/OFF)"
", priority: %s (default = 0/LAST).\n",
HPWDT_VERSION, soft_margin, nowayout,
(allow_kdump == 0) ? "OFF" : "ON",
(priority == 0) ? "LAST" : "FIRST");
dev_info(&dev->dev, "HP Watchdog Timer Driver: %s"
", timer margin: %d seconds (nowayout=%d).\n",
HPWDT_VERSION, soft_margin, nowayout);
return 0;
error_misc_register:
unregister_die_notifier(&die_notifier);
error_die_notifier:
if (cru_rom_addr)
iounmap(cru_rom_addr);
error_get_cru:
hpwdt_exit_nmi_decoding();
error_init_nmi_decoding:
pci_iounmap(dev, pci_mem_addr);
error_pci_iomap:
pci_disable_device(dev);
@ -768,10 +811,7 @@ static void __devexit hpwdt_exit(struct pci_dev *dev)
hpwdt_stop();
misc_deregister(&hpwdt_miscdev);
unregister_die_notifier(&die_notifier);
if (cru_rom_addr)
iounmap(cru_rom_addr);
hpwdt_exit_nmi_decoding();
pci_iounmap(dev, pci_mem_addr);
pci_disable_device(dev);
}
@ -802,16 +842,18 @@ 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) ")");
#ifdef CONFIG_HPWDT_NMI_DECODING
module_param(allow_kdump, int, 0);
MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
" (default = 0/Last)\n");
#endif /* !CONFIG_HPWDT_NMI_DECODING */
module_init(hpwdt_init);
module_exit(hpwdt_cleanup);