445 lines
9.9 KiB
C
445 lines
9.9 KiB
C
/*
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* HPE WatchDog Driver
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* based on
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*
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* SoftDog 0.05: A Software Watchdog Device
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*
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* (c) Copyright 2015 Hewlett Packard Enterprise Development LP
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* Thomas Mingarelli <thomas.mingarelli@hpe.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/io.h>
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#include <linux/bitops.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <asm/nmi.h>
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#define HPWDT_VERSION "1.4.0"
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#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
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#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
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#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
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#define DEFAULT_MARGIN 30
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static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
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static unsigned int reload; /* the computed soft_margin */
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static bool nowayout = WATCHDOG_NOWAYOUT;
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#ifdef CONFIG_HPWDT_NMI_DECODING
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static unsigned int allow_kdump = 1;
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#endif
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static char expect_release;
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static unsigned long hpwdt_is_open;
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static void __iomem *pci_mem_addr; /* the PCI-memory address */
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static unsigned long __iomem *hpwdt_nmistat;
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static unsigned long __iomem *hpwdt_timer_reg;
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static unsigned long __iomem *hpwdt_timer_con;
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static const struct pci_device_id hpwdt_devices[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */
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{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */
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{0}, /* terminate list */
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};
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MODULE_DEVICE_TABLE(pci, hpwdt_devices);
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/*
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* Watchdog operations
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*/
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static void hpwdt_start(void)
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{
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reload = SECS_TO_TICKS(soft_margin);
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iowrite16(reload, hpwdt_timer_reg);
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iowrite8(0x85, hpwdt_timer_con);
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}
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static void hpwdt_stop(void)
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{
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unsigned long data;
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data = ioread8(hpwdt_timer_con);
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data &= 0xFE;
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iowrite8(data, hpwdt_timer_con);
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}
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static void hpwdt_ping(void)
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{
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iowrite16(reload, hpwdt_timer_reg);
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}
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static int hpwdt_change_timer(int new_margin)
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{
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if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
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pr_warn("New value passed in is invalid: %d seconds\n",
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new_margin);
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return -EINVAL;
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}
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soft_margin = new_margin;
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pr_debug("New timer passed in is %d seconds\n", new_margin);
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reload = SECS_TO_TICKS(soft_margin);
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return 0;
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}
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static int hpwdt_time_left(void)
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{
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return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
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}
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#ifdef CONFIG_HPWDT_NMI_DECODING
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static int hpwdt_my_nmi(void)
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{
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return ioread8(hpwdt_nmistat) & 0x6;
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}
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/*
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* NMI Handler
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*/
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static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
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{
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if ((ulReason == NMI_UNKNOWN) && !hpwdt_my_nmi())
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return NMI_DONE;
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if (allow_kdump)
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hpwdt_stop();
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nmi_panic(regs, "An NMI occurred. Depending on your system the reason "
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"for the NMI is logged in any one of the following "
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"resources:\n"
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"1. Integrated Management Log (IML)\n"
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"2. OA Syslog\n"
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"3. OA Forward Progress Log\n"
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"4. iLO Event Log");
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return NMI_HANDLED;
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}
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#endif /* CONFIG_HPWDT_NMI_DECODING */
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/*
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* /dev/watchdog handling
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*/
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static int hpwdt_open(struct inode *inode, struct file *file)
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{
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/* /dev/watchdog can only be opened once */
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if (test_and_set_bit(0, &hpwdt_is_open))
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return -EBUSY;
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/* Start the watchdog */
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hpwdt_start();
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hpwdt_ping();
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return nonseekable_open(inode, file);
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}
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static int hpwdt_release(struct inode *inode, struct file *file)
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{
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/* Stop the watchdog */
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if (expect_release == 42) {
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hpwdt_stop();
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} else {
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pr_crit("Unexpected close, not stopping watchdog!\n");
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hpwdt_ping();
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}
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expect_release = 0;
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/* /dev/watchdog is being closed, make sure it can be re-opened */
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clear_bit(0, &hpwdt_is_open);
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return 0;
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}
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static ssize_t hpwdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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/* See if we got the magic character 'V' and reload the timer */
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if (len) {
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if (!nowayout) {
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size_t i;
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/* note: just in case someone wrote the magic character
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* five months ago... */
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expect_release = 0;
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/* scan to see whether or not we got the magic char. */
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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expect_release = 42;
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}
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}
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/* someone wrote to us, we should reload the timer */
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hpwdt_ping();
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}
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return len;
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}
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static const struct watchdog_info ident = {
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.options = WDIOF_SETTIMEOUT |
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WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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.identity = "HPE iLO2+ HW Watchdog Timer",
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};
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static long hpwdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int new_margin, options;
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int ret = -ENOTTY;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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ret = 0;
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if (copy_to_user(argp, &ident, sizeof(ident)))
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ret = -EFAULT;
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break;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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ret = put_user(0, p);
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break;
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case WDIOC_KEEPALIVE:
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hpwdt_ping();
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ret = 0;
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break;
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case WDIOC_SETOPTIONS:
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ret = get_user(options, p);
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if (ret)
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break;
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if (options & WDIOS_DISABLECARD)
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hpwdt_stop();
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if (options & WDIOS_ENABLECARD) {
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hpwdt_start();
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hpwdt_ping();
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}
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break;
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case WDIOC_SETTIMEOUT:
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ret = get_user(new_margin, p);
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if (ret)
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break;
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ret = hpwdt_change_timer(new_margin);
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if (ret)
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break;
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hpwdt_ping();
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/* Fall */
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case WDIOC_GETTIMEOUT:
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ret = put_user(soft_margin, p);
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break;
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case WDIOC_GETTIMELEFT:
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ret = put_user(hpwdt_time_left(), p);
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break;
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}
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return ret;
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}
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/*
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* Kernel interfaces
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*/
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static const struct file_operations hpwdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = hpwdt_write,
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.unlocked_ioctl = hpwdt_ioctl,
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.open = hpwdt_open,
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.release = hpwdt_release,
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};
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static struct miscdevice hpwdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &hpwdt_fops,
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};
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/*
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* Init & Exit
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*/
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static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
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{
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#ifdef CONFIG_HPWDT_NMI_DECODING
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int retval;
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/*
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* Only one function can register for NMI_UNKNOWN
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*/
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retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
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if (retval)
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goto error;
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retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
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if (retval)
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goto error1;
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retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
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if (retval)
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goto error2;
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dev_info(&dev->dev,
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"HPE Watchdog Timer Driver: NMI decoding initialized"
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", allow kernel dump: %s (default = 1/ON)\n",
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(allow_kdump == 0) ? "OFF" : "ON");
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return 0;
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error2:
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unregister_nmi_handler(NMI_SERR, "hpwdt");
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error1:
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unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
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error:
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dev_warn(&dev->dev,
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"Unable to register a die notifier (err=%d).\n",
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retval);
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return retval;
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#endif /* CONFIG_HPWDT_NMI_DECODING */
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return 0;
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}
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static void hpwdt_exit_nmi_decoding(void)
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{
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#ifdef CONFIG_HPWDT_NMI_DECODING
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unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
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unregister_nmi_handler(NMI_SERR, "hpwdt");
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unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
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#endif
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}
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static int hpwdt_init_one(struct pci_dev *dev,
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const struct pci_device_id *ent)
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{
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int retval;
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/*
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* First let's find out if we are on an iLO2+ server. We will
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* not run on a legacy ASM box.
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* So we only support the G5 ProLiant servers and higher.
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*/
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if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
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dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
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dev_warn(&dev->dev,
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"This server does not have an iLO2+ ASIC.\n");
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return -ENODEV;
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}
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/*
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* Ignore all auxilary iLO devices with the following PCI ID
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*/
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if (dev->subsystem_vendor == PCI_VENDOR_ID_HP &&
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dev->subsystem_device == 0x1979)
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return -ENODEV;
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if (pci_enable_device(dev)) {
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dev_warn(&dev->dev,
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"Not possible to enable PCI Device: 0x%x:0x%x.\n",
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ent->vendor, ent->device);
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return -ENODEV;
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}
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pci_mem_addr = pci_iomap(dev, 1, 0x80);
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if (!pci_mem_addr) {
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dev_warn(&dev->dev,
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"Unable to detect the iLO2+ server memory.\n");
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retval = -ENOMEM;
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goto error_pci_iomap;
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}
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hpwdt_nmistat = pci_mem_addr + 0x6e;
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hpwdt_timer_reg = pci_mem_addr + 0x70;
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hpwdt_timer_con = pci_mem_addr + 0x72;
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/* Make sure that timer is disabled until /dev/watchdog is opened */
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hpwdt_stop();
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/* Make sure that we have a valid soft_margin */
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if (hpwdt_change_timer(soft_margin))
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hpwdt_change_timer(DEFAULT_MARGIN);
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/* Initialize NMI Decoding functionality */
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retval = hpwdt_init_nmi_decoding(dev);
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if (retval != 0)
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goto error_init_nmi_decoding;
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retval = misc_register(&hpwdt_miscdev);
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if (retval < 0) {
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dev_warn(&dev->dev,
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"Unable to register miscdev on minor=%d (err=%d).\n",
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WATCHDOG_MINOR, retval);
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goto error_misc_register;
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}
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dev_info(&dev->dev, "HPE Watchdog Timer Driver: %s"
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", timer margin: %d seconds (nowayout=%d).\n",
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HPWDT_VERSION, soft_margin, nowayout);
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return 0;
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error_misc_register:
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hpwdt_exit_nmi_decoding();
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error_init_nmi_decoding:
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pci_iounmap(dev, pci_mem_addr);
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error_pci_iomap:
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pci_disable_device(dev);
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return retval;
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}
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static void hpwdt_exit(struct pci_dev *dev)
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{
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if (!nowayout)
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hpwdt_stop();
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misc_deregister(&hpwdt_miscdev);
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hpwdt_exit_nmi_decoding();
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pci_iounmap(dev, pci_mem_addr);
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pci_disable_device(dev);
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}
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static struct pci_driver hpwdt_driver = {
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.name = "hpwdt",
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.id_table = hpwdt_devices,
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.probe = hpwdt_init_one,
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.remove = hpwdt_exit,
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};
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MODULE_AUTHOR("Tom Mingarelli");
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MODULE_DESCRIPTION("hp watchdog driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(HPWDT_VERSION);
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module_param(soft_margin, int, 0);
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MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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#ifdef CONFIG_HPWDT_NMI_DECODING
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module_param(allow_kdump, int, 0);
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MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
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#endif /* CONFIG_HPWDT_NMI_DECODING */
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module_pci_driver(hpwdt_driver);
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