diff options
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/watchdog/hpwdt.c | 216 |
2 files changed, 48 insertions, 169 deletions
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 37460cd6cabb..e873522fca2d 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -1118,6 +1118,7 @@ config IT87_WDT config HP_WATCHDOG tristate "HP ProLiant iLO2+ Hardware Watchdog Timer" + select WATCHDOG_CORE depends on X86 && PCI help A software monitoring watchdog and NMI sourcing driver. This driver diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index 44c3038cc531..0e35bb735d8e 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -16,17 +16,13 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/device.h> -#include <linux/fs.h> #include <linux/io.h> -#include <linux/bitops.h> #include <linux/kernel.h> -#include <linux/miscdevice.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/pci.h> #include <linux/pci_ids.h> #include <linux/types.h> -#include <linux/uaccess.h> #include <linux/watchdog.h> #include <asm/nmi.h> @@ -42,8 +38,6 @@ static bool nowayout = WATCHDOG_NOWAYOUT; #ifdef CONFIG_HPWDT_NMI_DECODING static unsigned int allow_kdump = 1; #endif -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_nmistat; @@ -61,11 +55,14 @@ MODULE_DEVICE_TABLE(pci, hpwdt_devices); /* * Watchdog operations */ -static void hpwdt_start(void) +static int hpwdt_start(struct watchdog_device *wdd) { - reload = SECS_TO_TICKS(soft_margin); + reload = SECS_TO_TICKS(wdd->timeout); + iowrite16(reload, hpwdt_timer_reg); iowrite8(0x85, hpwdt_timer_con); + + return 0; } static void hpwdt_stop(void) @@ -77,31 +74,32 @@ static void hpwdt_stop(void) iowrite8(data, hpwdt_timer_con); } -static void hpwdt_ping(void) +static int hpwdt_stop_core(struct watchdog_device *wdd) { - iowrite16(reload, hpwdt_timer_reg); + hpwdt_stop(); + + return 0; } -static int hpwdt_change_timer(int new_margin) +static int hpwdt_ping(struct watchdog_device *wdd) { - if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) { - pr_warn("New value passed in is invalid: %d seconds\n", - new_margin); - return -EINVAL; - } - - soft_margin = new_margin; - pr_debug("New timer passed in is %d seconds\n", new_margin); - reload = SECS_TO_TICKS(soft_margin); - + iowrite16(reload, hpwdt_timer_reg); return 0; } -static int hpwdt_time_left(void) +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) +{ + wdd->timeout = val; + hpwdt_ping(wdd); + + return 0; +} + #ifdef CONFIG_HPWDT_NMI_DECODING static int hpwdt_my_nmi(void) { @@ -135,68 +133,6 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs) } #endif /* CONFIG_HPWDT_NMI_DECODING */ -/* - * /dev/watchdog handling - */ -static int hpwdt_open(struct inode *inode, struct file *file) -{ - /* /dev/watchdog can only be opened once */ - if (test_and_set_bit(0, &hpwdt_is_open)) - return -EBUSY; - - /* Start the watchdog */ - hpwdt_start(); - hpwdt_ping(); - - return nonseekable_open(inode, file); -} - -static int hpwdt_release(struct inode *inode, struct file *file) -{ - /* Stop the watchdog */ - if (expect_release == 42) { - hpwdt_stop(); - } else { - pr_crit("Unexpected close, not stopping watchdog!\n"); - hpwdt_ping(); - } - - expect_release = 0; - - /* /dev/watchdog is being closed, make sure it can be re-opened */ - clear_bit(0, &hpwdt_is_open); - - return 0; -} - -static ssize_t hpwdt_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - /* See if we got the magic character 'V' and reload the timer */ - if (len) { - if (!nowayout) { - size_t i; - - /* note: just in case someone wrote the magic character - * five months ago... */ - expect_release = 0; - - /* scan to see whether or not we got the magic char. */ - for (i = 0; i != len; i++) { - char c; - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - expect_release = 42; - } - } - - /* someone wrote to us, we should reload the timer */ - hpwdt_ping(); - } - - return len; -} static const struct watchdog_info ident = { .options = WDIOF_SETTIMEOUT | @@ -205,90 +141,32 @@ static const struct watchdog_info ident = { .identity = "HPE iLO2+ HW Watchdog Timer", }; -static long hpwdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_margin, options; - int ret = -ENOTTY; - - switch (cmd) { - case WDIOC_GETSUPPORT: - ret = 0; - if (copy_to_user(argp, &ident, sizeof(ident))) - ret = -EFAULT; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - ret = put_user(0, p); - break; - - case WDIOC_KEEPALIVE: - hpwdt_ping(); - ret = 0; - break; - - case WDIOC_SETOPTIONS: - ret = get_user(options, p); - if (ret) - break; - - if (options & WDIOS_DISABLECARD) - hpwdt_stop(); - - if (options & WDIOS_ENABLECARD) { - hpwdt_start(); - hpwdt_ping(); - } - break; - - case WDIOC_SETTIMEOUT: - ret = get_user(new_margin, p); - if (ret) - break; - - ret = hpwdt_change_timer(new_margin); - if (ret) - break; - - hpwdt_ping(); - /* Fall */ - case WDIOC_GETTIMEOUT: - ret = put_user(soft_margin, p); - break; - - case WDIOC_GETTIMELEFT: - ret = put_user(hpwdt_time_left(), p); - break; - } - return ret; -} - /* * Kernel interfaces */ -static const struct file_operations hpwdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = hpwdt_write, - .unlocked_ioctl = hpwdt_ioctl, - .open = hpwdt_open, - .release = hpwdt_release, + +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, }; -static struct miscdevice hpwdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &hpwdt_fops, +static struct watchdog_device hpwdt_dev = { + .info = &ident, + .ops = &hpwdt_ops, + .min_timeout = 1, + .max_timeout = HPWDT_MAX_TIMER, + .timeout = DEFAULT_MARGIN, }; + /* * Init & Exit */ - static int hpwdt_init_nmi_decoding(struct pci_dev *dev) { #ifdef CONFIG_HPWDT_NMI_DECODING @@ -379,29 +257,29 @@ static int hpwdt_init_one(struct pci_dev *dev, /* Make sure that timer is disabled until /dev/watchdog is opened */ hpwdt_stop(); - /* 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); + 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_warn(&dev->dev, - "Unable to register miscdev on minor=%d (err=%d).\n", - WATCHDOG_MINOR, retval); - goto error_misc_register; + 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, soft_margin, nowayout); + HPWDT_VERSION, hpwdt_dev.timeout, nowayout); + return 0; -error_misc_register: +error_wd_register: hpwdt_exit_nmi_decoding(); error_init_nmi_decoding: pci_iounmap(dev, pci_mem_addr); @@ -415,7 +293,7 @@ static void hpwdt_exit(struct pci_dev *dev) if (!nowayout) hpwdt_stop(); - misc_deregister(&hpwdt_miscdev); + watchdog_unregister_device(&hpwdt_dev); hpwdt_exit_nmi_decoding(); pci_iounmap(dev, pci_mem_addr); pci_disable_device(dev); |