diff options
Diffstat (limited to 'drivers/watchdog/hpwdt.c')
| -rw-r--r-- | drivers/watchdog/hpwdt.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c new file mode 100644 index 000000000..9dc62a461 --- /dev/null +++ b/drivers/watchdog/hpwdt.c @@ -0,0 +1,376 @@ +/* + * HPE WatchDog Driver + * based on + * + * SoftDog 0.05: A Software Watchdog Device + * + * (c) Copyright 2018 Hewlett Packard Enterprise Development LP + * Thomas Mingarelli <thomas.mingarelli@hpe.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/device.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/pci.h> +#include <linux/pci_ids.h> +#include <linux/types.h> +#include <linux/watchdog.h> +#include <asm/nmi.h> + +#define HPWDT_VERSION "2.0.0" +#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 +#define PRETIMEOUT_SEC 9 + +static bool ilo5; +static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */ +static bool nowayout = WATCHDOG_NOWAYOUT; +static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING); + +static void __iomem *pci_mem_addr; /* the PCI-memory address */ +static unsigned long __iomem *hpwdt_nmistat; +static unsigned long __iomem *hpwdt_timer_reg; +static unsigned long __iomem *hpwdt_timer_con; + +static const 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); + + +/* + * Watchdog operations + */ +static int hpwdt_start(struct watchdog_device *wdd) +{ + int control = 0x81 | (pretimeout ? 0x4 : 0); + int reload = SECS_TO_TICKS(wdd->timeout); + + dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%02x\n", reload, control); + iowrite16(reload, hpwdt_timer_reg); + iowrite8(control, hpwdt_timer_con); + + return 0; +} + +static void hpwdt_stop(void) +{ + unsigned long data; + + pr_debug("stop watchdog\n"); + + data = ioread8(hpwdt_timer_con); + data &= 0xFE; + iowrite8(data, hpwdt_timer_con); +} + +static int hpwdt_stop_core(struct watchdog_device *wdd) +{ + hpwdt_stop(); + + return 0; +} + +static int hpwdt_ping(struct watchdog_device *wdd) +{ + int reload = SECS_TO_TICKS(wdd->timeout); + + dev_dbg(wdd->parent, "ping watchdog 0x%08x\n", reload); + iowrite16(reload, hpwdt_timer_reg); + + return 0; +} + +static unsigned int hpwdt_gettimeleft(struct watchdog_device *wdd) +{ + return TICKS_TO_SECS(ioread16(hpwdt_timer_reg)); +} + +static int hpwdt_settimeout(struct watchdog_device *wdd, unsigned int val) +{ + dev_dbg(wdd->parent, "set_timeout = %d\n", val); + + wdd->timeout = val; + if (val <= wdd->pretimeout) { + dev_dbg(wdd->parent, "pretimeout < timeout. Setting to zero\n"); + wdd->pretimeout = 0; + pretimeout = 0; + if (watchdog_active(wdd)) + hpwdt_start(wdd); + } + hpwdt_ping(wdd); + + return 0; +} + +#ifdef CONFIG_HPWDT_NMI_DECODING +static int hpwdt_set_pretimeout(struct watchdog_device *wdd, unsigned int req) +{ + unsigned int val = 0; + + dev_dbg(wdd->parent, "set_pretimeout = %d\n", req); + if (req) { + val = PRETIMEOUT_SEC; + if (val >= wdd->timeout) + return -EINVAL; + } + + if (val != req) + dev_dbg(wdd->parent, "Rounding pretimeout to: %d\n", val); + + wdd->pretimeout = val; + pretimeout = !!val; + + if (watchdog_active(wdd)) + hpwdt_start(wdd); + + return 0; +} + +static int hpwdt_my_nmi(void) +{ + return ioread8(hpwdt_nmistat) & 0x6; +} + +/* + * NMI Handler + */ +static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) +{ + unsigned int mynmi = hpwdt_my_nmi(); + static char panic_msg[] = + "00: An NMI occurred. Depending on your system the reason " + "for the NMI is logged in any one of the following resources:\n" + "1. Integrated Management Log (IML)\n" + "2. OA Syslog\n" + "3. OA Forward Progress Log\n" + "4. iLO Event Log"; + + if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi) + return NMI_DONE; + + if (ilo5 && !pretimeout) + return NMI_DONE; + + hpwdt_stop(); + + hex_byte_pack(panic_msg, mynmi); + nmi_panic(regs, panic_msg); + + return NMI_HANDLED; +} +#endif /* CONFIG_HPWDT_NMI_DECODING */ + + +static const struct watchdog_info ident = { + .options = WDIOF_PRETIMEOUT | + WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE, + .identity = "HPE iLO2+ HW Watchdog Timer", +}; + +/* + * Kernel interfaces + */ + +static const struct watchdog_ops hpwdt_ops = { + .owner = THIS_MODULE, + .start = hpwdt_start, + .stop = hpwdt_stop_core, + .ping = hpwdt_ping, + .set_timeout = hpwdt_settimeout, + .get_timeleft = hpwdt_gettimeleft, +#ifdef CONFIG_HPWDT_NMI_DECODING + .set_pretimeout = hpwdt_set_pretimeout, +#endif +}; + +static struct watchdog_device hpwdt_dev = { + .info = &ident, + .ops = &hpwdt_ops, + .min_timeout = 1, + .max_timeout = HPWDT_MAX_TIMER, + .timeout = DEFAULT_MARGIN, +#ifdef CONFIG_HPWDT_NMI_DECODING + .pretimeout = PRETIMEOUT_SEC, +#endif +}; + + +/* + * Init & Exit + */ + +static int hpwdt_init_nmi_decoding(struct pci_dev *dev) +{ +#ifdef CONFIG_HPWDT_NMI_DECODING + int retval; + /* + * Only one function can register for NMI_UNKNOWN + */ + retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt"); + if (retval) + goto error; + retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt"); + if (retval) + goto error1; + retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt"); + if (retval) + goto error2; + + dev_info(&dev->dev, + "HPE Watchdog Timer Driver: NMI decoding initialized\n"); + + return 0; + +error2: + unregister_nmi_handler(NMI_SERR, "hpwdt"); +error1: + unregister_nmi_handler(NMI_UNKNOWN, "hpwdt"); +error: + dev_warn(&dev->dev, + "Unable to register a die notifier (err=%d).\n", + retval); + return retval; +#endif /* CONFIG_HPWDT_NMI_DECODING */ + return 0; +} + +static void hpwdt_exit_nmi_decoding(void) +{ +#ifdef CONFIG_HPWDT_NMI_DECODING + unregister_nmi_handler(NMI_UNKNOWN, "hpwdt"); + unregister_nmi_handler(NMI_SERR, "hpwdt"); + unregister_nmi_handler(NMI_IO_CHECK, "hpwdt"); +#endif +} + +static int hpwdt_init_one(struct pci_dev *dev, + const struct pci_device_id *ent) +{ + int retval; + + /* + * 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->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) { + dev_warn(&dev->dev, + "This server does not have an iLO2+ ASIC.\n"); + return -ENODEV; + } + + /* + * Ignore all auxilary iLO devices with the following PCI ID + */ + if (dev->subsystem_vendor == PCI_VENDOR_ID_HP && + dev->subsystem_device == 0x1979) + 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_nmistat = pci_mem_addr + 0x6e; + hpwdt_timer_reg = pci_mem_addr + 0x70; + hpwdt_timer_con = pci_mem_addr + 0x72; + + /* Make sure that timer is disabled until /dev/watchdog is opened */ + hpwdt_stop(); + + /* Initialize NMI Decoding functionality */ + retval = hpwdt_init_nmi_decoding(dev); + if (retval != 0) + goto error_init_nmi_decoding; + + watchdog_set_nowayout(&hpwdt_dev, nowayout); + if (watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL)) + dev_warn(&dev->dev, "Invalid soft_margin: %d.\n", soft_margin); + + hpwdt_dev.parent = &dev->dev; + retval = watchdog_register_device(&hpwdt_dev); + if (retval < 0) { + dev_err(&dev->dev, "watchdog register failed: %d.\n", retval); + goto error_wd_register; + } + + dev_info(&dev->dev, "HPE Watchdog Timer Driver: %s" + ", timer margin: %d seconds (nowayout=%d).\n", + HPWDT_VERSION, hpwdt_dev.timeout, nowayout); + + if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR) + ilo5 = true; + + return 0; + +error_wd_register: + hpwdt_exit_nmi_decoding(); +error_init_nmi_decoding: + pci_iounmap(dev, pci_mem_addr); +error_pci_iomap: + pci_disable_device(dev); + return retval; +} + +static void hpwdt_exit(struct pci_dev *dev) +{ + if (!nowayout) + hpwdt_stop(); + + watchdog_unregister_device(&hpwdt_dev); + hpwdt_exit_nmi_decoding(); + pci_iounmap(dev, pci_mem_addr); + pci_disable_device(dev); +} + +static struct pci_driver hpwdt_driver = { + .name = "hpwdt", + .id_table = hpwdt_devices, + .probe = hpwdt_init_one, + .remove = hpwdt_exit, +}; + +MODULE_AUTHOR("Tom Mingarelli"); +MODULE_DESCRIPTION("hpe watchdog driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(HPWDT_VERSION); + +module_param(soft_margin, int, 0); +MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds"); + +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +#ifdef CONFIG_HPWDT_NMI_DECODING +module_param(pretimeout, bool, 0); +MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled"); +#endif + +module_pci_driver(hpwdt_driver); |