diff options
Diffstat (limited to 'drivers/watchdog/hpwdt.c')
| -rw-r--r-- | drivers/watchdog/hpwdt.c | 65 |
1 files changed, 43 insertions, 22 deletions
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index db1bf6f546ae..7d34bcf1c45b 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * HPE WatchDog Driver * based on @@ -6,11 +7,6 @@ * * (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 @@ -26,10 +22,11 @@ #include <linux/watchdog.h> #include <asm/nmi.h> -#define HPWDT_VERSION "2.0.2" +#define HPWDT_VERSION "2.0.3" #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 HPWDT_MAX_TICKS 65535 +#define HPWDT_MAX_TIMER TICKS_TO_SECS(HPWDT_MAX_TICKS) #define DEFAULT_MARGIN 30 #define PRETIMEOUT_SEC 9 @@ -37,6 +34,7 @@ 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 int kdumptimeout = -1; static void __iomem *pci_mem_addr; /* the PCI-memory address */ static unsigned long __iomem *hpwdt_nmistat; @@ -56,15 +54,21 @@ static const struct pci_device_id hpwdt_blacklist[] = { {0}, /* terminate list */ }; +static struct watchdog_device hpwdt_dev; /* * Watchdog operations */ +static int hpwdt_hw_is_running(void) +{ + return ioread8(hpwdt_timer_con) & 0x01; +} + static int hpwdt_start(struct watchdog_device *wdd) { int control = 0x81 | (pretimeout ? 0x4 : 0); - int reload = SECS_TO_TICKS(wdd->timeout); + int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000)); - dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%02x\n", reload, control); + dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%08x:0x%02x\n", wdd->timeout, reload, control); iowrite16(reload, hpwdt_timer_reg); iowrite8(control, hpwdt_timer_con); @@ -89,12 +93,18 @@ static int hpwdt_stop_core(struct watchdog_device *wdd) return 0; } +static void hpwdt_ping_ticks(int val) +{ + val = min(val, HPWDT_MAX_TICKS); + iowrite16(val, hpwdt_timer_reg); +} + static int hpwdt_ping(struct watchdog_device *wdd) { - int reload = SECS_TO_TICKS(wdd->timeout); + int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000)); - dev_dbg(wdd->parent, "ping watchdog 0x%08x\n", reload); - iowrite16(reload, hpwdt_timer_reg); + dev_dbg(wdd->parent, "ping watchdog 0x%08x:0x%08x\n", wdd->timeout, reload); + hpwdt_ping_ticks(reload); return 0; } @@ -170,7 +180,14 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) if (ilo5 && !pretimeout && !mynmi) return NMI_DONE; - hpwdt_stop(); + if (kdumptimeout < 0) + hpwdt_stop(); + else if (kdumptimeout == 0) + ; + else { + unsigned int val = max((unsigned int)kdumptimeout, hpwdt_dev.timeout); + hpwdt_ping_ticks(SECS_TO_TICKS(val)); + } hex_byte_pack(panic_msg, mynmi); nmi_panic(regs, panic_msg); @@ -208,9 +225,9 @@ static struct watchdog_device hpwdt_dev = { .info = &ident, .ops = &hpwdt_ops, .min_timeout = 1, - .max_timeout = HPWDT_MAX_TIMER, .timeout = DEFAULT_MARGIN, .pretimeout = PRETIMEOUT_SEC, + .max_hw_heartbeat_ms = HPWDT_MAX_TIMER * 1000, }; @@ -302,14 +319,18 @@ static int hpwdt_init_one(struct pci_dev *dev, 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(); + /* Have the core update running timer until user space is ready */ + if (hpwdt_hw_is_running()) { + dev_info(&dev->dev, "timer is running\n"); + set_bit(WDOG_HW_RUNNING, &hpwdt_dev.status); + } /* Initialize NMI Decoding functionality */ retval = hpwdt_init_nmi_decoding(dev); if (retval != 0) goto error_init_nmi_decoding; + watchdog_stop_on_unregister(&hpwdt_dev); watchdog_set_nowayout(&hpwdt_dev, nowayout); watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL); @@ -318,13 +339,12 @@ static int hpwdt_init_one(struct pci_dev *dev, pretimeout = 0; } hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0; + kdumptimeout = min(kdumptimeout, HPWDT_MAX_TIMER); hpwdt_dev.parent = &dev->dev; retval = watchdog_register_device(&hpwdt_dev); - if (retval < 0) { - dev_err(&dev->dev, "watchdog register failed: %d.\n", retval); + if (retval < 0) goto error_wd_register; - } dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n", HPWDT_VERSION); @@ -332,6 +352,7 @@ static int hpwdt_init_one(struct pci_dev *dev, hpwdt_dev.timeout, nowayout); dev_info(&dev->dev, "pretimeout: %s.\n", pretimeout ? "on" : "off"); + dev_info(&dev->dev, "kdumptimeout: %d.\n", kdumptimeout); if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR) ilo5 = true; @@ -349,9 +370,6 @@ error_pci_iomap: 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); @@ -380,6 +398,9 @@ module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); +module_param(kdumptimeout, int, 0444); +MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds"); + #ifdef CONFIG_HPWDT_NMI_DECODING module_param(pretimeout, bool, 0); MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled"); |