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b36eb5e7b7
Don't do kfree or other risky things when oops_in_progress is set. It's easy enough to avoid doing them Signed-off-by: Corey Minyard <cminyard@mvista.com>
1352 lines
32 KiB
C
1352 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ipmi_watchdog.c
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*
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* A watchdog timer based upon the IPMI interface.
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*
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* Author: MontaVista Software, Inc.
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* Corey Minyard <minyard@mvista.com>
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* source@mvista.com
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*
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* Copyright 2002 MontaVista Software Inc.
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*/
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#define pr_fmt(fmt) "IPMI Watchdog: " fmt
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/ipmi.h>
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#include <linux/ipmi_smi.h>
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#include <linux/mutex.h>
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#include <linux/watchdog.h>
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#include <linux/miscdevice.h>
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#include <linux/init.h>
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#include <linux/completion.h>
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#include <linux/kdebug.h>
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#include <linux/rwsem.h>
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#include <linux/errno.h>
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#include <linux/uaccess.h>
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#include <linux/notifier.h>
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#include <linux/nmi.h>
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#include <linux/reboot.h>
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#include <linux/wait.h>
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#include <linux/poll.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/atomic.h>
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#include <linux/sched/signal.h>
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#ifdef CONFIG_X86
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/*
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* This is ugly, but I've determined that x86 is the only architecture
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* that can reasonably support the IPMI NMI watchdog timeout at this
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* time. If another architecture adds this capability somehow, it
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* will have to be a somewhat different mechanism and I have no idea
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* how it will work. So in the unlikely event that another
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* architecture supports this, we can figure out a good generic
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* mechanism for it at that time.
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*/
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#include <asm/kdebug.h>
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#include <asm/nmi.h>
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#define HAVE_DIE_NMI
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#endif
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/*
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* The IPMI command/response information for the watchdog timer.
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*/
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/* values for byte 1 of the set command, byte 2 of the get response. */
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#define WDOG_DONT_LOG (1 << 7)
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#define WDOG_DONT_STOP_ON_SET (1 << 6)
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#define WDOG_SET_TIMER_USE(byte, use) \
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byte = ((byte) & 0xf8) | ((use) & 0x7)
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#define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7)
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#define WDOG_TIMER_USE_BIOS_FRB2 1
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#define WDOG_TIMER_USE_BIOS_POST 2
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#define WDOG_TIMER_USE_OS_LOAD 3
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#define WDOG_TIMER_USE_SMS_OS 4
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#define WDOG_TIMER_USE_OEM 5
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/* values for byte 2 of the set command, byte 3 of the get response. */
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#define WDOG_SET_PRETIMEOUT_ACT(byte, use) \
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byte = ((byte) & 0x8f) | (((use) & 0x7) << 4)
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#define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7)
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#define WDOG_PRETIMEOUT_NONE 0
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#define WDOG_PRETIMEOUT_SMI 1
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#define WDOG_PRETIMEOUT_NMI 2
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#define WDOG_PRETIMEOUT_MSG_INT 3
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/* Operations that can be performed on a pretimout. */
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#define WDOG_PREOP_NONE 0
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#define WDOG_PREOP_PANIC 1
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/* Cause data to be available to read. Doesn't work in NMI mode. */
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#define WDOG_PREOP_GIVE_DATA 2
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/* Actions to perform on a full timeout. */
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#define WDOG_SET_TIMEOUT_ACT(byte, use) \
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byte = ((byte) & 0xf8) | ((use) & 0x7)
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#define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7)
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#define WDOG_TIMEOUT_NONE 0
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#define WDOG_TIMEOUT_RESET 1
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#define WDOG_TIMEOUT_POWER_DOWN 2
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#define WDOG_TIMEOUT_POWER_CYCLE 3
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/*
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* Byte 3 of the get command, byte 4 of the get response is the
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* pre-timeout in seconds.
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*/
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/* Bits for setting byte 4 of the set command, byte 5 of the get response. */
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#define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1)
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#define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2)
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#define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3)
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#define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4)
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#define WDOG_EXPIRE_CLEAR_OEM (1 << 5)
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/*
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* Setting/getting the watchdog timer value. This is for bytes 5 and
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* 6 (the timeout time) of the set command, and bytes 6 and 7 (the
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* timeout time) and 8 and 9 (the current countdown value) of the
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* response. The timeout value is given in seconds (in the command it
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* is 100ms intervals).
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*/
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#define WDOG_SET_TIMEOUT(byte1, byte2, val) \
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(byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8)
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#define WDOG_GET_TIMEOUT(byte1, byte2) \
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(((byte1) | ((byte2) << 8)) / 10)
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#define IPMI_WDOG_RESET_TIMER 0x22
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#define IPMI_WDOG_SET_TIMER 0x24
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#define IPMI_WDOG_GET_TIMER 0x25
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#define IPMI_WDOG_TIMER_NOT_INIT_RESP 0x80
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static DEFINE_MUTEX(ipmi_watchdog_mutex);
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static bool nowayout = WATCHDOG_NOWAYOUT;
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static struct ipmi_user *watchdog_user;
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static int watchdog_ifnum;
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/* Default the timeout to 10 seconds. */
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static int timeout = 10;
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/* The pre-timeout is disabled by default. */
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static int pretimeout;
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/* Default timeout to set on panic */
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static int panic_wdt_timeout = 255;
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/* Default action is to reset the board on a timeout. */
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static unsigned char action_val = WDOG_TIMEOUT_RESET;
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static char action[16] = "reset";
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static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE;
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static char preaction[16] = "pre_none";
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static unsigned char preop_val = WDOG_PREOP_NONE;
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static char preop[16] = "preop_none";
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static DEFINE_SPINLOCK(ipmi_read_lock);
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static char data_to_read;
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static DECLARE_WAIT_QUEUE_HEAD(read_q);
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static struct fasync_struct *fasync_q;
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static atomic_t pretimeout_since_last_heartbeat;
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static char expect_close;
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static int ifnum_to_use = -1;
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/* Parameters to ipmi_set_timeout */
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#define IPMI_SET_TIMEOUT_NO_HB 0
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#define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1
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#define IPMI_SET_TIMEOUT_FORCE_HB 2
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static int ipmi_set_timeout(int do_heartbeat);
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static void ipmi_register_watchdog(int ipmi_intf);
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static void ipmi_unregister_watchdog(int ipmi_intf);
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/*
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* If true, the driver will start running as soon as it is configured
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* and ready.
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*/
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static int start_now;
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static int set_param_timeout(const char *val, const struct kernel_param *kp)
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{
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char *endp;
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int l;
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int rv = 0;
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if (!val)
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return -EINVAL;
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l = simple_strtoul(val, &endp, 0);
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if (endp == val)
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return -EINVAL;
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*((int *)kp->arg) = l;
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if (watchdog_user)
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rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
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return rv;
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}
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static const struct kernel_param_ops param_ops_timeout = {
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.set = set_param_timeout,
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.get = param_get_int,
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};
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#define param_check_timeout param_check_int
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typedef int (*action_fn)(const char *intval, char *outval);
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static int action_op(const char *inval, char *outval);
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static int preaction_op(const char *inval, char *outval);
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static int preop_op(const char *inval, char *outval);
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static void check_parms(void);
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static int set_param_str(const char *val, const struct kernel_param *kp)
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{
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action_fn fn = (action_fn) kp->arg;
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int rv = 0;
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char valcp[16];
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char *s;
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strncpy(valcp, val, 15);
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valcp[15] = '\0';
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s = strstrip(valcp);
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rv = fn(s, NULL);
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if (rv)
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goto out;
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check_parms();
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if (watchdog_user)
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rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
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out:
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return rv;
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}
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static int get_param_str(char *buffer, const struct kernel_param *kp)
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{
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action_fn fn = (action_fn) kp->arg;
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int rv, len;
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rv = fn(NULL, buffer);
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if (rv)
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return rv;
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len = strlen(buffer);
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buffer[len++] = '\n';
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buffer[len] = 0;
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return len;
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}
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static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp)
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{
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int rv = param_set_int(val, kp);
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if (rv)
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return rv;
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if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum))
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return 0;
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ipmi_unregister_watchdog(watchdog_ifnum);
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ipmi_register_watchdog(ifnum_to_use);
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return 0;
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}
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static const struct kernel_param_ops param_ops_wdog_ifnum = {
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.set = set_param_wdog_ifnum,
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.get = param_get_int,
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};
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#define param_check_wdog_ifnum param_check_int
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static const struct kernel_param_ops param_ops_str = {
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.set = set_param_str,
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.get = get_param_str,
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};
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module_param(ifnum_to_use, wdog_ifnum, 0644);
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MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
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"timer. Setting to -1 defaults to the first registered "
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"interface");
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module_param(timeout, timeout, 0644);
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MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
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module_param(pretimeout, timeout, 0644);
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MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");
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module_param(panic_wdt_timeout, timeout, 0644);
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MODULE_PARM_DESC(panic_wdt_timeout, "Timeout value on kernel panic in seconds.");
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module_param_cb(action, ¶m_ops_str, action_op, 0644);
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MODULE_PARM_DESC(action, "Timeout action. One of: "
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"reset, none, power_cycle, power_off.");
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module_param_cb(preaction, ¶m_ops_str, preaction_op, 0644);
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MODULE_PARM_DESC(preaction, "Pretimeout action. One of: "
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"pre_none, pre_smi, pre_nmi, pre_int.");
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module_param_cb(preop, ¶m_ops_str, preop_op, 0644);
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MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: "
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"preop_none, preop_panic, preop_give_data.");
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module_param(start_now, int, 0444);
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MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as"
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"soon as the driver is loaded.");
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module_param(nowayout, bool, 0644);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
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"(default=CONFIG_WATCHDOG_NOWAYOUT)");
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/* Default state of the timer. */
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static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
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/* Is someone using the watchdog? Only one user is allowed. */
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static unsigned long ipmi_wdog_open;
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/*
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* If set to 1, the heartbeat command will set the state to reset and
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* start the timer. The timer doesn't normally run when the driver is
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* first opened until the heartbeat is set the first time, this
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* variable is used to accomplish this.
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*/
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static int ipmi_start_timer_on_heartbeat;
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/* IPMI version of the BMC. */
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static unsigned char ipmi_version_major;
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static unsigned char ipmi_version_minor;
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/* If a pretimeout occurs, this is used to allow only one panic to happen. */
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static atomic_t preop_panic_excl = ATOMIC_INIT(-1);
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#ifdef HAVE_DIE_NMI
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static int testing_nmi;
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static int nmi_handler_registered;
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#endif
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static int __ipmi_heartbeat(void);
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/*
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* We use a mutex to make sure that only one thing can send a set a
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* message at one time. The mutex is claimed when a message is sent
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* and freed when both the send and receive messages are free.
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*/
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static atomic_t msg_tofree = ATOMIC_INIT(0);
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static DECLARE_COMPLETION(msg_wait);
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static void msg_free_smi(struct ipmi_smi_msg *msg)
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{
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if (atomic_dec_and_test(&msg_tofree)) {
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if (!oops_in_progress)
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complete(&msg_wait);
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}
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}
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static void msg_free_recv(struct ipmi_recv_msg *msg)
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{
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if (atomic_dec_and_test(&msg_tofree)) {
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if (!oops_in_progress)
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complete(&msg_wait);
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}
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}
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static struct ipmi_smi_msg smi_msg = {
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.done = msg_free_smi
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};
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static struct ipmi_recv_msg recv_msg = {
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.done = msg_free_recv
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};
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static int __ipmi_set_timeout(struct ipmi_smi_msg *smi_msg,
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struct ipmi_recv_msg *recv_msg,
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int *send_heartbeat_now)
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{
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struct kernel_ipmi_msg msg;
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unsigned char data[6];
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int rv;
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struct ipmi_system_interface_addr addr;
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int hbnow = 0;
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data[0] = 0;
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WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
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if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
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if ((ipmi_version_major > 1) ||
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((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) {
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/* This is an IPMI 1.5-only feature. */
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data[0] |= WDOG_DONT_STOP_ON_SET;
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} else {
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/*
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* In ipmi 1.0, setting the timer stops the watchdog, we
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* need to start it back up again.
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*/
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hbnow = 1;
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}
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}
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data[1] = 0;
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WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state);
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if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) {
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WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val);
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data[2] = pretimeout;
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} else {
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WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE);
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data[2] = 0; /* No pretimeout. */
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}
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data[3] = 0;
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WDOG_SET_TIMEOUT(data[4], data[5], timeout);
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addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
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addr.channel = IPMI_BMC_CHANNEL;
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addr.lun = 0;
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msg.netfn = 0x06;
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msg.cmd = IPMI_WDOG_SET_TIMER;
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msg.data = data;
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msg.data_len = sizeof(data);
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rv = ipmi_request_supply_msgs(watchdog_user,
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(struct ipmi_addr *) &addr,
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0,
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&msg,
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NULL,
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smi_msg,
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recv_msg,
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1);
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if (rv)
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pr_warn("set timeout error: %d\n", rv);
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else if (send_heartbeat_now)
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*send_heartbeat_now = hbnow;
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return rv;
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}
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static int _ipmi_set_timeout(int do_heartbeat)
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{
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int send_heartbeat_now;
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int rv;
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if (!watchdog_user)
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return -ENODEV;
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atomic_set(&msg_tofree, 2);
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rv = __ipmi_set_timeout(&smi_msg,
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&recv_msg,
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&send_heartbeat_now);
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if (rv) {
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atomic_set(&msg_tofree, 0);
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return rv;
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}
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wait_for_completion(&msg_wait);
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if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB)
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|| ((send_heartbeat_now)
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&& (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY)))
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rv = __ipmi_heartbeat();
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return rv;
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}
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static int ipmi_set_timeout(int do_heartbeat)
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{
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int rv;
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mutex_lock(&ipmi_watchdog_mutex);
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rv = _ipmi_set_timeout(do_heartbeat);
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mutex_unlock(&ipmi_watchdog_mutex);
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return rv;
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}
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static atomic_t panic_done_count = ATOMIC_INIT(0);
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static void panic_smi_free(struct ipmi_smi_msg *msg)
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{
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atomic_dec(&panic_done_count);
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}
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static void panic_recv_free(struct ipmi_recv_msg *msg)
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{
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atomic_dec(&panic_done_count);
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}
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static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = {
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.done = panic_smi_free
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};
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static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = {
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.done = panic_recv_free
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};
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|
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static void panic_halt_ipmi_heartbeat(void)
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{
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struct kernel_ipmi_msg msg;
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struct ipmi_system_interface_addr addr;
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int rv;
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|
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/*
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* Don't reset the timer if we have the timer turned off, that
|
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* re-enables the watchdog.
|
|
*/
|
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
|
|
return;
|
|
|
|
addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
|
|
addr.channel = IPMI_BMC_CHANNEL;
|
|
addr.lun = 0;
|
|
|
|
msg.netfn = 0x06;
|
|
msg.cmd = IPMI_WDOG_RESET_TIMER;
|
|
msg.data = NULL;
|
|
msg.data_len = 0;
|
|
atomic_add(2, &panic_done_count);
|
|
rv = ipmi_request_supply_msgs(watchdog_user,
|
|
(struct ipmi_addr *) &addr,
|
|
0,
|
|
&msg,
|
|
NULL,
|
|
&panic_halt_heartbeat_smi_msg,
|
|
&panic_halt_heartbeat_recv_msg,
|
|
1);
|
|
if (rv)
|
|
atomic_sub(2, &panic_done_count);
|
|
}
|
|
|
|
static struct ipmi_smi_msg panic_halt_smi_msg = {
|
|
.done = panic_smi_free
|
|
};
|
|
static struct ipmi_recv_msg panic_halt_recv_msg = {
|
|
.done = panic_recv_free
|
|
};
|
|
|
|
/*
|
|
* Special call, doesn't claim any locks. This is only to be called
|
|
* at panic or halt time, in run-to-completion mode, when the caller
|
|
* is the only CPU and the only thing that will be going is these IPMI
|
|
* calls.
|
|
*/
|
|
static void panic_halt_ipmi_set_timeout(void)
|
|
{
|
|
int send_heartbeat_now;
|
|
int rv;
|
|
|
|
/* Wait for the messages to be free. */
|
|
while (atomic_read(&panic_done_count) != 0)
|
|
ipmi_poll_interface(watchdog_user);
|
|
atomic_add(2, &panic_done_count);
|
|
rv = __ipmi_set_timeout(&panic_halt_smi_msg,
|
|
&panic_halt_recv_msg,
|
|
&send_heartbeat_now);
|
|
if (rv) {
|
|
atomic_sub(2, &panic_done_count);
|
|
pr_warn("Unable to extend the watchdog timeout\n");
|
|
} else {
|
|
if (send_heartbeat_now)
|
|
panic_halt_ipmi_heartbeat();
|
|
}
|
|
while (atomic_read(&panic_done_count) != 0)
|
|
ipmi_poll_interface(watchdog_user);
|
|
}
|
|
|
|
static int __ipmi_heartbeat(void)
|
|
{
|
|
struct kernel_ipmi_msg msg;
|
|
int rv;
|
|
struct ipmi_system_interface_addr addr;
|
|
int timeout_retries = 0;
|
|
|
|
restart:
|
|
/*
|
|
* Don't reset the timer if we have the timer turned off, that
|
|
* re-enables the watchdog.
|
|
*/
|
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
|
|
return 0;
|
|
|
|
atomic_set(&msg_tofree, 2);
|
|
|
|
addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
|
|
addr.channel = IPMI_BMC_CHANNEL;
|
|
addr.lun = 0;
|
|
|
|
msg.netfn = 0x06;
|
|
msg.cmd = IPMI_WDOG_RESET_TIMER;
|
|
msg.data = NULL;
|
|
msg.data_len = 0;
|
|
rv = ipmi_request_supply_msgs(watchdog_user,
|
|
(struct ipmi_addr *) &addr,
|
|
0,
|
|
&msg,
|
|
NULL,
|
|
&smi_msg,
|
|
&recv_msg,
|
|
1);
|
|
if (rv) {
|
|
atomic_set(&msg_tofree, 0);
|
|
pr_warn("heartbeat send failure: %d\n", rv);
|
|
return rv;
|
|
}
|
|
|
|
/* Wait for the heartbeat to be sent. */
|
|
wait_for_completion(&msg_wait);
|
|
|
|
if (recv_msg.msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) {
|
|
timeout_retries++;
|
|
if (timeout_retries > 3) {
|
|
pr_err("Unable to restore the IPMI watchdog's settings, giving up\n");
|
|
rv = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The timer was not initialized, that means the BMC was
|
|
* probably reset and lost the watchdog information. Attempt
|
|
* to restore the timer's info. Note that we still hold
|
|
* the heartbeat lock, to keep a heartbeat from happening
|
|
* in this process, so must say no heartbeat to avoid a
|
|
* deadlock on this mutex
|
|
*/
|
|
rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
|
|
if (rv) {
|
|
pr_err("Unable to send the command to set the watchdog's settings, giving up\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Might need a heartbeat send, go ahead and do it. */
|
|
goto restart;
|
|
} else if (recv_msg.msg.data[0] != 0) {
|
|
/*
|
|
* Got an error in the heartbeat response. It was already
|
|
* reported in ipmi_wdog_msg_handler, but we should return
|
|
* an error here.
|
|
*/
|
|
rv = -EINVAL;
|
|
}
|
|
|
|
out:
|
|
return rv;
|
|
}
|
|
|
|
static int _ipmi_heartbeat(void)
|
|
{
|
|
int rv;
|
|
|
|
if (!watchdog_user)
|
|
return -ENODEV;
|
|
|
|
if (ipmi_start_timer_on_heartbeat) {
|
|
ipmi_start_timer_on_heartbeat = 0;
|
|
ipmi_watchdog_state = action_val;
|
|
rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
|
|
} else if (atomic_cmpxchg(&pretimeout_since_last_heartbeat, 1, 0)) {
|
|
/*
|
|
* A pretimeout occurred, make sure we set the timeout.
|
|
* We don't want to set the action, though, we want to
|
|
* leave that alone (thus it can't be combined with the
|
|
* above operation.
|
|
*/
|
|
rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
|
|
} else {
|
|
rv = __ipmi_heartbeat();
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int ipmi_heartbeat(void)
|
|
{
|
|
int rv;
|
|
|
|
mutex_lock(&ipmi_watchdog_mutex);
|
|
rv = _ipmi_heartbeat();
|
|
mutex_unlock(&ipmi_watchdog_mutex);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static struct watchdog_info ident = {
|
|
.options = 0, /* WDIOF_SETTIMEOUT, */
|
|
.firmware_version = 1,
|
|
.identity = "IPMI"
|
|
};
|
|
|
|
static int ipmi_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
int i;
|
|
int val;
|
|
|
|
switch (cmd) {
|
|
case WDIOC_GETSUPPORT:
|
|
i = copy_to_user(argp, &ident, sizeof(ident));
|
|
return i ? -EFAULT : 0;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
i = copy_from_user(&val, argp, sizeof(int));
|
|
if (i)
|
|
return -EFAULT;
|
|
timeout = val;
|
|
return _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
|
|
|
|
case WDIOC_GETTIMEOUT:
|
|
i = copy_to_user(argp, &timeout, sizeof(timeout));
|
|
if (i)
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case WDIOC_SETPRETIMEOUT:
|
|
i = copy_from_user(&val, argp, sizeof(int));
|
|
if (i)
|
|
return -EFAULT;
|
|
pretimeout = val;
|
|
return _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
|
|
|
|
case WDIOC_GETPRETIMEOUT:
|
|
i = copy_to_user(argp, &pretimeout, sizeof(pretimeout));
|
|
if (i)
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case WDIOC_KEEPALIVE:
|
|
return _ipmi_heartbeat();
|
|
|
|
case WDIOC_SETOPTIONS:
|
|
i = copy_from_user(&val, argp, sizeof(int));
|
|
if (i)
|
|
return -EFAULT;
|
|
if (val & WDIOS_DISABLECARD) {
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
|
|
_ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
|
|
ipmi_start_timer_on_heartbeat = 0;
|
|
}
|
|
|
|
if (val & WDIOS_ENABLECARD) {
|
|
ipmi_watchdog_state = action_val;
|
|
_ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
|
|
}
|
|
return 0;
|
|
|
|
case WDIOC_GETSTATUS:
|
|
val = 0;
|
|
i = copy_to_user(argp, &val, sizeof(val));
|
|
if (i)
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
static long ipmi_unlocked_ioctl(struct file *file,
|
|
unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&ipmi_watchdog_mutex);
|
|
ret = ipmi_ioctl(file, cmd, arg);
|
|
mutex_unlock(&ipmi_watchdog_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ipmi_write(struct file *file,
|
|
const char __user *buf,
|
|
size_t len,
|
|
loff_t *ppos)
|
|
{
|
|
int rv;
|
|
|
|
if (len) {
|
|
if (!nowayout) {
|
|
size_t i;
|
|
|
|
/* In case it was set long ago */
|
|
expect_close = 0;
|
|
|
|
for (i = 0; i != len; i++) {
|
|
char c;
|
|
|
|
if (get_user(c, buf + i))
|
|
return -EFAULT;
|
|
if (c == 'V')
|
|
expect_close = 42;
|
|
}
|
|
}
|
|
rv = ipmi_heartbeat();
|
|
if (rv)
|
|
return rv;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
static ssize_t ipmi_read(struct file *file,
|
|
char __user *buf,
|
|
size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
int rv = 0;
|
|
wait_queue_entry_t wait;
|
|
|
|
if (count <= 0)
|
|
return 0;
|
|
|
|
/*
|
|
* Reading returns if the pretimeout has gone off, and it only does
|
|
* it once per pretimeout.
|
|
*/
|
|
spin_lock_irq(&ipmi_read_lock);
|
|
if (!data_to_read) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
rv = -EAGAIN;
|
|
goto out;
|
|
}
|
|
|
|
init_waitqueue_entry(&wait, current);
|
|
add_wait_queue(&read_q, &wait);
|
|
while (!data_to_read) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
spin_unlock_irq(&ipmi_read_lock);
|
|
schedule();
|
|
spin_lock_irq(&ipmi_read_lock);
|
|
}
|
|
remove_wait_queue(&read_q, &wait);
|
|
|
|
if (signal_pending(current)) {
|
|
rv = -ERESTARTSYS;
|
|
goto out;
|
|
}
|
|
}
|
|
data_to_read = 0;
|
|
|
|
out:
|
|
spin_unlock_irq(&ipmi_read_lock);
|
|
|
|
if (rv == 0) {
|
|
if (copy_to_user(buf, &data_to_read, 1))
|
|
rv = -EFAULT;
|
|
else
|
|
rv = 1;
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
static int ipmi_open(struct inode *ino, struct file *filep)
|
|
{
|
|
switch (iminor(ino)) {
|
|
case WATCHDOG_MINOR:
|
|
if (test_and_set_bit(0, &ipmi_wdog_open))
|
|
return -EBUSY;
|
|
|
|
|
|
/*
|
|
* Don't start the timer now, let it start on the
|
|
* first heartbeat.
|
|
*/
|
|
ipmi_start_timer_on_heartbeat = 1;
|
|
return stream_open(ino, filep);
|
|
|
|
default:
|
|
return (-ENODEV);
|
|
}
|
|
}
|
|
|
|
static __poll_t ipmi_poll(struct file *file, poll_table *wait)
|
|
{
|
|
__poll_t mask = 0;
|
|
|
|
poll_wait(file, &read_q, wait);
|
|
|
|
spin_lock_irq(&ipmi_read_lock);
|
|
if (data_to_read)
|
|
mask |= (EPOLLIN | EPOLLRDNORM);
|
|
spin_unlock_irq(&ipmi_read_lock);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int ipmi_fasync(int fd, struct file *file, int on)
|
|
{
|
|
int result;
|
|
|
|
result = fasync_helper(fd, file, on, &fasync_q);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static int ipmi_close(struct inode *ino, struct file *filep)
|
|
{
|
|
if (iminor(ino) == WATCHDOG_MINOR) {
|
|
if (expect_close == 42) {
|
|
mutex_lock(&ipmi_watchdog_mutex);
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
|
|
_ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
|
|
mutex_unlock(&ipmi_watchdog_mutex);
|
|
} else {
|
|
pr_crit("Unexpected close, not stopping watchdog!\n");
|
|
ipmi_heartbeat();
|
|
}
|
|
clear_bit(0, &ipmi_wdog_open);
|
|
}
|
|
|
|
expect_close = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations ipmi_wdog_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = ipmi_read,
|
|
.poll = ipmi_poll,
|
|
.write = ipmi_write,
|
|
.unlocked_ioctl = ipmi_unlocked_ioctl,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.open = ipmi_open,
|
|
.release = ipmi_close,
|
|
.fasync = ipmi_fasync,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct miscdevice ipmi_wdog_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &ipmi_wdog_fops
|
|
};
|
|
|
|
static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg,
|
|
void *handler_data)
|
|
{
|
|
if (msg->msg.cmd == IPMI_WDOG_RESET_TIMER &&
|
|
msg->msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP)
|
|
pr_info("response: The IPMI controller appears to have been reset, will attempt to reinitialize the watchdog timer\n");
|
|
else if (msg->msg.data[0] != 0)
|
|
pr_err("response: Error %x on cmd %x\n",
|
|
msg->msg.data[0],
|
|
msg->msg.cmd);
|
|
|
|
ipmi_free_recv_msg(msg);
|
|
}
|
|
|
|
static void ipmi_wdog_pretimeout_handler(void *handler_data)
|
|
{
|
|
if (preaction_val != WDOG_PRETIMEOUT_NONE) {
|
|
if (preop_val == WDOG_PREOP_PANIC) {
|
|
if (atomic_inc_and_test(&preop_panic_excl))
|
|
panic("Watchdog pre-timeout");
|
|
} else if (preop_val == WDOG_PREOP_GIVE_DATA) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ipmi_read_lock, flags);
|
|
data_to_read = 1;
|
|
wake_up_interruptible(&read_q);
|
|
kill_fasync(&fasync_q, SIGIO, POLL_IN);
|
|
spin_unlock_irqrestore(&ipmi_read_lock, flags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* On some machines, the heartbeat will give an error and not
|
|
* work unless we re-enable the timer. So do so.
|
|
*/
|
|
atomic_set(&pretimeout_since_last_heartbeat, 1);
|
|
}
|
|
|
|
static void ipmi_wdog_panic_handler(void *user_data)
|
|
{
|
|
static int panic_event_handled;
|
|
|
|
/*
|
|
* On a panic, if we have a panic timeout, make sure to extend
|
|
* the watchdog timer to a reasonable value to complete the
|
|
* panic, if the watchdog timer is running. Plus the
|
|
* pretimeout is meaningless at panic time.
|
|
*/
|
|
if (watchdog_user && !panic_event_handled &&
|
|
ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
|
|
/* Make sure we do this only once. */
|
|
panic_event_handled = 1;
|
|
|
|
timeout = panic_wdt_timeout;
|
|
pretimeout = 0;
|
|
panic_halt_ipmi_set_timeout();
|
|
}
|
|
}
|
|
|
|
static const struct ipmi_user_hndl ipmi_hndlrs = {
|
|
.ipmi_recv_hndl = ipmi_wdog_msg_handler,
|
|
.ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler,
|
|
.ipmi_panic_handler = ipmi_wdog_panic_handler
|
|
};
|
|
|
|
static void ipmi_register_watchdog(int ipmi_intf)
|
|
{
|
|
int rv = -EBUSY;
|
|
|
|
if (watchdog_user)
|
|
goto out;
|
|
|
|
if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf))
|
|
goto out;
|
|
|
|
watchdog_ifnum = ipmi_intf;
|
|
|
|
rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user);
|
|
if (rv < 0) {
|
|
pr_crit("Unable to register with ipmi\n");
|
|
goto out;
|
|
}
|
|
|
|
rv = ipmi_get_version(watchdog_user,
|
|
&ipmi_version_major,
|
|
&ipmi_version_minor);
|
|
if (rv) {
|
|
pr_warn("Unable to get IPMI version, assuming 1.0\n");
|
|
ipmi_version_major = 1;
|
|
ipmi_version_minor = 0;
|
|
}
|
|
|
|
rv = misc_register(&ipmi_wdog_miscdev);
|
|
if (rv < 0) {
|
|
ipmi_destroy_user(watchdog_user);
|
|
watchdog_user = NULL;
|
|
pr_crit("Unable to register misc device\n");
|
|
}
|
|
|
|
#ifdef HAVE_DIE_NMI
|
|
if (nmi_handler_registered) {
|
|
int old_pretimeout = pretimeout;
|
|
int old_timeout = timeout;
|
|
int old_preop_val = preop_val;
|
|
|
|
/*
|
|
* Set the pretimeout to go off in a second and give
|
|
* ourselves plenty of time to stop the timer.
|
|
*/
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
|
|
preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */
|
|
pretimeout = 99;
|
|
timeout = 100;
|
|
|
|
testing_nmi = 1;
|
|
|
|
rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
|
|
if (rv) {
|
|
pr_warn("Error starting timer to test NMI: 0x%x. The NMI pretimeout will likely not work\n",
|
|
rv);
|
|
rv = 0;
|
|
goto out_restore;
|
|
}
|
|
|
|
msleep(1500);
|
|
|
|
if (testing_nmi != 2) {
|
|
pr_warn("IPMI NMI didn't seem to occur. The NMI pretimeout will likely not work\n");
|
|
}
|
|
out_restore:
|
|
testing_nmi = 0;
|
|
preop_val = old_preop_val;
|
|
pretimeout = old_pretimeout;
|
|
timeout = old_timeout;
|
|
}
|
|
#endif
|
|
|
|
out:
|
|
if ((start_now) && (rv == 0)) {
|
|
/* Run from startup, so start the timer now. */
|
|
start_now = 0; /* Disable this function after first startup. */
|
|
ipmi_watchdog_state = action_val;
|
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
|
|
pr_info("Starting now!\n");
|
|
} else {
|
|
/* Stop the timer now. */
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
|
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
|
|
}
|
|
}
|
|
|
|
static void ipmi_unregister_watchdog(int ipmi_intf)
|
|
{
|
|
int rv;
|
|
struct ipmi_user *loc_user = watchdog_user;
|
|
|
|
if (!loc_user)
|
|
return;
|
|
|
|
if (watchdog_ifnum != ipmi_intf)
|
|
return;
|
|
|
|
/* Make sure no one can call us any more. */
|
|
misc_deregister(&ipmi_wdog_miscdev);
|
|
|
|
watchdog_user = NULL;
|
|
|
|
/*
|
|
* Wait to make sure the message makes it out. The lower layer has
|
|
* pointers to our buffers, we want to make sure they are done before
|
|
* we release our memory.
|
|
*/
|
|
while (atomic_read(&msg_tofree))
|
|
msg_free_smi(NULL);
|
|
|
|
mutex_lock(&ipmi_watchdog_mutex);
|
|
|
|
/* Disconnect from IPMI. */
|
|
rv = ipmi_destroy_user(loc_user);
|
|
if (rv)
|
|
pr_warn("error unlinking from IPMI: %d\n", rv);
|
|
|
|
/* If it comes back, restart it properly. */
|
|
ipmi_start_timer_on_heartbeat = 1;
|
|
|
|
mutex_unlock(&ipmi_watchdog_mutex);
|
|
}
|
|
|
|
#ifdef HAVE_DIE_NMI
|
|
static int
|
|
ipmi_nmi(unsigned int val, struct pt_regs *regs)
|
|
{
|
|
/*
|
|
* If we get here, it's an NMI that's not a memory or I/O
|
|
* error. We can't truly tell if it's from IPMI or not
|
|
* without sending a message, and sending a message is almost
|
|
* impossible because of locking.
|
|
*/
|
|
|
|
if (testing_nmi) {
|
|
testing_nmi = 2;
|
|
return NMI_HANDLED;
|
|
}
|
|
|
|
/* If we are not expecting a timeout, ignore it. */
|
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
|
|
return NMI_DONE;
|
|
|
|
if (preaction_val != WDOG_PRETIMEOUT_NMI)
|
|
return NMI_DONE;
|
|
|
|
/*
|
|
* If no one else handled the NMI, we assume it was the IPMI
|
|
* watchdog.
|
|
*/
|
|
if (preop_val == WDOG_PREOP_PANIC) {
|
|
/* On some machines, the heartbeat will give
|
|
an error and not work unless we re-enable
|
|
the timer. So do so. */
|
|
atomic_set(&pretimeout_since_last_heartbeat, 1);
|
|
if (atomic_inc_and_test(&preop_panic_excl))
|
|
nmi_panic(regs, "pre-timeout");
|
|
}
|
|
|
|
return NMI_HANDLED;
|
|
}
|
|
#endif
|
|
|
|
static int wdog_reboot_handler(struct notifier_block *this,
|
|
unsigned long code,
|
|
void *unused)
|
|
{
|
|
static int reboot_event_handled;
|
|
|
|
if ((watchdog_user) && (!reboot_event_handled)) {
|
|
/* Make sure we only do this once. */
|
|
reboot_event_handled = 1;
|
|
|
|
if (code == SYS_POWER_OFF || code == SYS_HALT) {
|
|
/* Disable the WDT if we are shutting down. */
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
|
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
|
|
} else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
|
|
/* Set a long timer to let the reboot happen or
|
|
reset if it hangs, but only if the watchdog
|
|
timer was already running. */
|
|
if (timeout < 120)
|
|
timeout = 120;
|
|
pretimeout = 0;
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
|
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
|
|
}
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block wdog_reboot_notifier = {
|
|
.notifier_call = wdog_reboot_handler,
|
|
.next = NULL,
|
|
.priority = 0
|
|
};
|
|
|
|
static void ipmi_new_smi(int if_num, struct device *device)
|
|
{
|
|
ipmi_register_watchdog(if_num);
|
|
}
|
|
|
|
static void ipmi_smi_gone(int if_num)
|
|
{
|
|
ipmi_unregister_watchdog(if_num);
|
|
}
|
|
|
|
static struct ipmi_smi_watcher smi_watcher = {
|
|
.owner = THIS_MODULE,
|
|
.new_smi = ipmi_new_smi,
|
|
.smi_gone = ipmi_smi_gone
|
|
};
|
|
|
|
static int action_op(const char *inval, char *outval)
|
|
{
|
|
if (outval)
|
|
strcpy(outval, action);
|
|
|
|
if (!inval)
|
|
return 0;
|
|
|
|
if (strcmp(inval, "reset") == 0)
|
|
action_val = WDOG_TIMEOUT_RESET;
|
|
else if (strcmp(inval, "none") == 0)
|
|
action_val = WDOG_TIMEOUT_NONE;
|
|
else if (strcmp(inval, "power_cycle") == 0)
|
|
action_val = WDOG_TIMEOUT_POWER_CYCLE;
|
|
else if (strcmp(inval, "power_off") == 0)
|
|
action_val = WDOG_TIMEOUT_POWER_DOWN;
|
|
else
|
|
return -EINVAL;
|
|
strcpy(action, inval);
|
|
return 0;
|
|
}
|
|
|
|
static int preaction_op(const char *inval, char *outval)
|
|
{
|
|
if (outval)
|
|
strcpy(outval, preaction);
|
|
|
|
if (!inval)
|
|
return 0;
|
|
|
|
if (strcmp(inval, "pre_none") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_NONE;
|
|
else if (strcmp(inval, "pre_smi") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_SMI;
|
|
#ifdef HAVE_DIE_NMI
|
|
else if (strcmp(inval, "pre_nmi") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_NMI;
|
|
#endif
|
|
else if (strcmp(inval, "pre_int") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_MSG_INT;
|
|
else
|
|
return -EINVAL;
|
|
strcpy(preaction, inval);
|
|
return 0;
|
|
}
|
|
|
|
static int preop_op(const char *inval, char *outval)
|
|
{
|
|
if (outval)
|
|
strcpy(outval, preop);
|
|
|
|
if (!inval)
|
|
return 0;
|
|
|
|
if (strcmp(inval, "preop_none") == 0)
|
|
preop_val = WDOG_PREOP_NONE;
|
|
else if (strcmp(inval, "preop_panic") == 0)
|
|
preop_val = WDOG_PREOP_PANIC;
|
|
else if (strcmp(inval, "preop_give_data") == 0)
|
|
preop_val = WDOG_PREOP_GIVE_DATA;
|
|
else
|
|
return -EINVAL;
|
|
strcpy(preop, inval);
|
|
return 0;
|
|
}
|
|
|
|
static void check_parms(void)
|
|
{
|
|
#ifdef HAVE_DIE_NMI
|
|
int do_nmi = 0;
|
|
int rv;
|
|
|
|
if (preaction_val == WDOG_PRETIMEOUT_NMI) {
|
|
do_nmi = 1;
|
|
if (preop_val == WDOG_PREOP_GIVE_DATA) {
|
|
pr_warn("Pretimeout op is to give data but NMI pretimeout is enabled, setting pretimeout op to none\n");
|
|
preop_op("preop_none", NULL);
|
|
do_nmi = 0;
|
|
}
|
|
}
|
|
if (do_nmi && !nmi_handler_registered) {
|
|
rv = register_nmi_handler(NMI_UNKNOWN, ipmi_nmi, 0,
|
|
"ipmi");
|
|
if (rv) {
|
|
pr_warn("Can't register nmi handler\n");
|
|
return;
|
|
} else
|
|
nmi_handler_registered = 1;
|
|
} else if (!do_nmi && nmi_handler_registered) {
|
|
unregister_nmi_handler(NMI_UNKNOWN, "ipmi");
|
|
nmi_handler_registered = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int __init ipmi_wdog_init(void)
|
|
{
|
|
int rv;
|
|
|
|
if (action_op(action, NULL)) {
|
|
action_op("reset", NULL);
|
|
pr_info("Unknown action '%s', defaulting to reset\n", action);
|
|
}
|
|
|
|
if (preaction_op(preaction, NULL)) {
|
|
preaction_op("pre_none", NULL);
|
|
pr_info("Unknown preaction '%s', defaulting to none\n",
|
|
preaction);
|
|
}
|
|
|
|
if (preop_op(preop, NULL)) {
|
|
preop_op("preop_none", NULL);
|
|
pr_info("Unknown preop '%s', defaulting to none\n", preop);
|
|
}
|
|
|
|
check_parms();
|
|
|
|
register_reboot_notifier(&wdog_reboot_notifier);
|
|
|
|
rv = ipmi_smi_watcher_register(&smi_watcher);
|
|
if (rv) {
|
|
#ifdef HAVE_DIE_NMI
|
|
if (nmi_handler_registered)
|
|
unregister_nmi_handler(NMI_UNKNOWN, "ipmi");
|
|
#endif
|
|
unregister_reboot_notifier(&wdog_reboot_notifier);
|
|
pr_warn("can't register smi watcher\n");
|
|
return rv;
|
|
}
|
|
|
|
pr_info("driver initialized\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ipmi_wdog_exit(void)
|
|
{
|
|
ipmi_smi_watcher_unregister(&smi_watcher);
|
|
ipmi_unregister_watchdog(watchdog_ifnum);
|
|
|
|
#ifdef HAVE_DIE_NMI
|
|
if (nmi_handler_registered)
|
|
unregister_nmi_handler(NMI_UNKNOWN, "ipmi");
|
|
#endif
|
|
|
|
unregister_reboot_notifier(&wdog_reboot_notifier);
|
|
}
|
|
module_exit(ipmi_wdog_exit);
|
|
module_init(ipmi_wdog_init);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
|
|
MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface.");
|