diff options
Diffstat (limited to 'drivers/watchdog/hpwdt.c')
| -rw-r--r-- | drivers/watchdog/hpwdt.c | 310 |
1 files changed, 176 insertions, 134 deletions
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index 809e7167a624..3d77116e4634 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -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 @@ -246,8 +243,8 @@ static int __devinit cru_detect(unsigned long map_entry, physical_bios_offset); printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n", cru_length); - printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n", - (unsigned int)&cru_rom_addr); + printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n", + &cru_rom_addr); } iounmap(bios32_map); return retval; @@ -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; - - 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"); - } + goto out; + + 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; } @@ -621,80 +630,45 @@ 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 * BIOS Service Directory @@ -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); |