^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * ipmi_watchdog.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * A watchdog timer based upon the IPMI interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: MontaVista Software, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Corey Minyard <minyard@mvista.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * source@mvista.com
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Copyright 2002 MontaVista Software Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define pr_fmt(fmt) "IPMI Watchdog: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/ipmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/ipmi_smi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/rwsem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #ifdef CONFIG_X86
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * This is ugly, but I've determined that x86 is the only architecture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * that can reasonably support the IPMI NMI watchdog timeout at this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * time. If another architecture adds this capability somehow, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * will have to be a somewhat different mechanism and I have no idea
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * how it will work. So in the unlikely event that another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * architecture supports this, we can figure out a good generic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * mechanism for it at that time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <asm/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <asm/nmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * The IPMI command/response information for the watchdog timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* values for byte 1 of the set command, byte 2 of the get response. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #define WDOG_DONT_LOG (1 << 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #define WDOG_DONT_STOP_ON_SET (1 << 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #define WDOG_SET_TIMER_USE(byte, use) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) byte = ((byte) & 0xf8) | ((use) & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define WDOG_TIMER_USE_BIOS_FRB2 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define WDOG_TIMER_USE_BIOS_POST 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #define WDOG_TIMER_USE_OS_LOAD 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define WDOG_TIMER_USE_SMS_OS 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #define WDOG_TIMER_USE_OEM 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* values for byte 2 of the set command, byte 3 of the get response. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #define WDOG_SET_PRETIMEOUT_ACT(byte, use) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) byte = ((byte) & 0x8f) | (((use) & 0x7) << 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #define WDOG_PRETIMEOUT_NONE 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #define WDOG_PRETIMEOUT_SMI 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #define WDOG_PRETIMEOUT_NMI 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #define WDOG_PRETIMEOUT_MSG_INT 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Operations that can be performed on a pretimout. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) #define WDOG_PREOP_NONE 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #define WDOG_PREOP_PANIC 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* Cause data to be available to read. Doesn't work in NMI mode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #define WDOG_PREOP_GIVE_DATA 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /* Actions to perform on a full timeout. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define WDOG_SET_TIMEOUT_ACT(byte, use) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) byte = ((byte) & 0xf8) | ((use) & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define WDOG_TIMEOUT_NONE 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #define WDOG_TIMEOUT_RESET 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #define WDOG_TIMEOUT_POWER_DOWN 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) #define WDOG_TIMEOUT_POWER_CYCLE 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * Byte 3 of the get command, byte 4 of the get response is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * pre-timeout in seconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* Bits for setting byte 4 of the set command, byte 5 of the get response. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define WDOG_EXPIRE_CLEAR_OEM (1 << 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * Setting/getting the watchdog timer value. This is for bytes 5 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * 6 (the timeout time) of the set command, and bytes 6 and 7 (the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * timeout time) and 8 and 9 (the current countdown value) of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * response. The timeout value is given in seconds (in the command it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * is 100ms intervals).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #define WDOG_SET_TIMEOUT(byte1, byte2, val) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) (byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #define WDOG_GET_TIMEOUT(byte1, byte2) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) (((byte1) | ((byte2) << 8)) / 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) #define IPMI_WDOG_RESET_TIMER 0x22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) #define IPMI_WDOG_SET_TIMER 0x24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) #define IPMI_WDOG_GET_TIMER 0x25
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #define IPMI_WDOG_TIMER_NOT_INIT_RESP 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static DEFINE_MUTEX(ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static struct ipmi_user *watchdog_user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static int watchdog_ifnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /* Default the timeout to 10 seconds. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int timeout = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /* The pre-timeout is disabled by default. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static int pretimeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* Default timeout to set on panic */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int panic_wdt_timeout = 255;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) /* Default action is to reset the board on a timeout. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static unsigned char action_val = WDOG_TIMEOUT_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static char action[16] = "reset";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static char preaction[16] = "pre_none";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static unsigned char preop_val = WDOG_PREOP_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static char preop[16] = "preop_none";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static DEFINE_SPINLOCK(ipmi_read_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static char data_to_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static DECLARE_WAIT_QUEUE_HEAD(read_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static struct fasync_struct *fasync_q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static atomic_t pretimeout_since_last_heartbeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static char expect_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static int ifnum_to_use = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* Parameters to ipmi_set_timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) #define IPMI_SET_TIMEOUT_NO_HB 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) #define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) #define IPMI_SET_TIMEOUT_FORCE_HB 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static int ipmi_set_timeout(int do_heartbeat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static void ipmi_register_watchdog(int ipmi_intf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static void ipmi_unregister_watchdog(int ipmi_intf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * If true, the driver will start running as soon as it is configured
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * and ready.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static int start_now;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static int set_param_timeout(const char *val, const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) char *endp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) int rv = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) if (!val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) l = simple_strtoul(val, &endp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (endp == val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) *((int *)kp->arg) = l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (watchdog_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static const struct kernel_param_ops param_ops_timeout = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) .set = set_param_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) .get = param_get_int,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #define param_check_timeout param_check_int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) typedef int (*action_fn)(const char *intval, char *outval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static int action_op(const char *inval, char *outval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int preaction_op(const char *inval, char *outval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static int preop_op(const char *inval, char *outval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static void check_parms(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static int set_param_str(const char *val, const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) action_fn fn = (action_fn) kp->arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int rv = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) char valcp[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) char *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) strncpy(valcp, val, 15);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) valcp[15] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) s = strstrip(valcp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) rv = fn(s, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) check_parms();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (watchdog_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int get_param_str(char *buffer, const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) action_fn fn = (action_fn) kp->arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) int rv, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) rv = fn(NULL, buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) len = strlen(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) buffer[len++] = '\n';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) buffer[len] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) int rv = param_set_int(val, kp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ipmi_unregister_watchdog(watchdog_ifnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) ipmi_register_watchdog(ifnum_to_use);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static const struct kernel_param_ops param_ops_wdog_ifnum = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) .set = set_param_wdog_ifnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) .get = param_get_int,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) #define param_check_wdog_ifnum param_check_int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static const struct kernel_param_ops param_ops_str = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) .set = set_param_str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) .get = get_param_str,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) module_param(ifnum_to_use, wdog_ifnum, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) "timer. Setting to -1 defaults to the first registered "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) "interface");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) module_param(timeout, timeout, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) module_param(pretimeout, timeout, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) module_param(panic_wdt_timeout, timeout, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) MODULE_PARM_DESC(panic_wdt_timeout, "Timeout value on kernel panic in seconds.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) module_param_cb(action, ¶m_ops_str, action_op, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) MODULE_PARM_DESC(action, "Timeout action. One of: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) "reset, none, power_cycle, power_off.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) module_param_cb(preaction, ¶m_ops_str, preaction_op, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) MODULE_PARM_DESC(preaction, "Pretimeout action. One of: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) "pre_none, pre_smi, pre_nmi, pre_int.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) module_param_cb(preop, ¶m_ops_str, preop_op, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) "preop_none, preop_panic, preop_give_data.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) module_param(start_now, int, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) "soon as the driver is loaded.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) module_param(nowayout, bool, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) "(default=CONFIG_WATCHDOG_NOWAYOUT)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* Default state of the timer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /* Is someone using the watchdog? Only one user is allowed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static unsigned long ipmi_wdog_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * If set to 1, the heartbeat command will set the state to reset and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * start the timer. The timer doesn't normally run when the driver is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * first opened until the heartbeat is set the first time, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * variable is used to accomplish this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static int ipmi_start_timer_on_heartbeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /* IPMI version of the BMC. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static unsigned char ipmi_version_major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) static unsigned char ipmi_version_minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /* If a pretimeout occurs, this is used to allow only one panic to happen. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) static atomic_t preop_panic_excl = ATOMIC_INIT(-1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) #ifdef HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) static int testing_nmi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) static int nmi_handler_registered;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) static int __ipmi_heartbeat(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * We use a mutex to make sure that only one thing can send a set a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * message at one time. The mutex is claimed when a message is sent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * and freed when both the send and receive messages are free.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) static atomic_t msg_tofree = ATOMIC_INIT(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static DECLARE_COMPLETION(msg_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static void msg_free_smi(struct ipmi_smi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (atomic_dec_and_test(&msg_tofree)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (!oops_in_progress)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) complete(&msg_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static void msg_free_recv(struct ipmi_recv_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (atomic_dec_and_test(&msg_tofree)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (!oops_in_progress)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) complete(&msg_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) static struct ipmi_smi_msg smi_msg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) .done = msg_free_smi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) static struct ipmi_recv_msg recv_msg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) .done = msg_free_recv
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) static int __ipmi_set_timeout(struct ipmi_smi_msg *smi_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct ipmi_recv_msg *recv_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) int *send_heartbeat_now)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) struct kernel_ipmi_msg msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) unsigned char data[6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) struct ipmi_system_interface_addr addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) int hbnow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) data[0] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) if ((ipmi_version_major > 1) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) /* This is an IPMI 1.5-only feature. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) data[0] |= WDOG_DONT_STOP_ON_SET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * In ipmi 1.0, setting the timer stops the watchdog, we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * need to start it back up again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) hbnow = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) data[1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) data[2] = pretimeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) data[2] = 0; /* No pretimeout. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) data[3] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) WDOG_SET_TIMEOUT(data[4], data[5], timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) addr.channel = IPMI_BMC_CHANNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) addr.lun = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) msg.netfn = 0x06;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) msg.cmd = IPMI_WDOG_SET_TIMER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) msg.data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) msg.data_len = sizeof(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) rv = ipmi_request_supply_msgs(watchdog_user,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) (struct ipmi_addr *) &addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) &msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) smi_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) recv_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) pr_warn("set timeout error: %d\n", rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) else if (send_heartbeat_now)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) *send_heartbeat_now = hbnow;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) static int _ipmi_set_timeout(int do_heartbeat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) int send_heartbeat_now;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) if (!watchdog_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) atomic_set(&msg_tofree, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) rv = __ipmi_set_timeout(&smi_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) &recv_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) &send_heartbeat_now);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) atomic_set(&msg_tofree, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) wait_for_completion(&msg_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) || ((send_heartbeat_now)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) rv = __ipmi_heartbeat();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) static int ipmi_set_timeout(int do_heartbeat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) mutex_lock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) rv = _ipmi_set_timeout(do_heartbeat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) mutex_unlock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) static atomic_t panic_done_count = ATOMIC_INIT(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static void panic_smi_free(struct ipmi_smi_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) atomic_dec(&panic_done_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) static void panic_recv_free(struct ipmi_recv_msg *msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) atomic_dec(&panic_done_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) .done = panic_smi_free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) .done = panic_recv_free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) static void panic_halt_ipmi_heartbeat(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) struct kernel_ipmi_msg msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) struct ipmi_system_interface_addr addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * Don't reset the timer if we have the timer turned off, that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * re-enables the watchdog.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) addr.channel = IPMI_BMC_CHANNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) addr.lun = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) msg.netfn = 0x06;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) msg.cmd = IPMI_WDOG_RESET_TIMER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) msg.data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) msg.data_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) atomic_add(1, &panic_done_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) rv = ipmi_request_supply_msgs(watchdog_user,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) (struct ipmi_addr *) &addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) &msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) &panic_halt_heartbeat_smi_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) &panic_halt_heartbeat_recv_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) atomic_sub(1, &panic_done_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) static struct ipmi_smi_msg panic_halt_smi_msg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) .done = panic_smi_free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) static struct ipmi_recv_msg panic_halt_recv_msg = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) .done = panic_recv_free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) * Special call, doesn't claim any locks. This is only to be called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) * at panic or halt time, in run-to-completion mode, when the caller
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) * is the only CPU and the only thing that will be going is these IPMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) static void panic_halt_ipmi_set_timeout(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) int send_heartbeat_now;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) /* Wait for the messages to be free. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) while (atomic_read(&panic_done_count) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) ipmi_poll_interface(watchdog_user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) atomic_add(1, &panic_done_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) rv = __ipmi_set_timeout(&panic_halt_smi_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) &panic_halt_recv_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) &send_heartbeat_now);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) atomic_sub(1, &panic_done_count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) pr_warn("Unable to extend the watchdog timeout\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (send_heartbeat_now)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) panic_halt_ipmi_heartbeat();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) while (atomic_read(&panic_done_count) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) ipmi_poll_interface(watchdog_user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) static int __ipmi_heartbeat(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) struct kernel_ipmi_msg msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) struct ipmi_system_interface_addr addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) int timeout_retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) * Don't reset the timer if we have the timer turned off, that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) * re-enables the watchdog.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) atomic_set(&msg_tofree, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) addr.channel = IPMI_BMC_CHANNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) addr.lun = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) msg.netfn = 0x06;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) msg.cmd = IPMI_WDOG_RESET_TIMER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) msg.data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) msg.data_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) rv = ipmi_request_supply_msgs(watchdog_user,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) (struct ipmi_addr *) &addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) &msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) &smi_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) &recv_msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) atomic_set(&msg_tofree, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) pr_warn("heartbeat send failure: %d\n", rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) /* Wait for the heartbeat to be sent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) wait_for_completion(&msg_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (recv_msg.msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) timeout_retries++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (timeout_retries > 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) pr_err("Unable to restore the IPMI watchdog's settings, giving up\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) rv = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * The timer was not initialized, that means the BMC was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * probably reset and lost the watchdog information. Attempt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * to restore the timer's info. Note that we still hold
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) * the heartbeat lock, to keep a heartbeat from happening
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * in this process, so must say no heartbeat to avoid a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) * deadlock on this mutex
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) pr_err("Unable to send the command to set the watchdog's settings, giving up\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) /* Might need a heartbeat send, go ahead and do it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) goto restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) } else if (recv_msg.msg.data[0] != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * Got an error in the heartbeat response. It was already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * reported in ipmi_wdog_msg_handler, but we should return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) * an error here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) rv = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) static int _ipmi_heartbeat(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) if (!watchdog_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (ipmi_start_timer_on_heartbeat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) ipmi_start_timer_on_heartbeat = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) ipmi_watchdog_state = action_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) } else if (atomic_cmpxchg(&pretimeout_since_last_heartbeat, 1, 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) * A pretimeout occurred, make sure we set the timeout.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) * We don't want to set the action, though, we want to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) * leave that alone (thus it can't be combined with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) * above operation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) rv = __ipmi_heartbeat();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) static int ipmi_heartbeat(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) mutex_lock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) rv = _ipmi_heartbeat();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) mutex_unlock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) static struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) .options = 0, /* WDIOF_SETTIMEOUT, */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) .identity = "IPMI"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) static int ipmi_ioctl(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) int val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) i = copy_to_user(argp, &ident, sizeof(ident));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) return i ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) i = copy_from_user(&val, argp, sizeof(int));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) timeout = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) return _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) i = copy_to_user(argp, &timeout, sizeof(timeout));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) case WDIOC_SETPRETIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) i = copy_from_user(&val, argp, sizeof(int));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) pretimeout = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) return _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) case WDIOC_GETPRETIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) i = copy_to_user(argp, &pretimeout, sizeof(pretimeout));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) return _ipmi_heartbeat();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) i = copy_from_user(&val, argp, sizeof(int));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) if (val & WDIOS_DISABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) _ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) ipmi_start_timer_on_heartbeat = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) if (val & WDIOS_ENABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) ipmi_watchdog_state = action_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) _ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) val = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) i = copy_to_user(argp, &val, sizeof(val));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) return -ENOIOCTLCMD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) static long ipmi_unlocked_ioctl(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) mutex_lock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) ret = ipmi_ioctl(file, cmd, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) mutex_unlock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) static ssize_t ipmi_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) /* In case it was set long ago */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) for (i = 0; i != len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (get_user(c, buf + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) rv = ipmi_heartbeat();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) static ssize_t ipmi_read(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) int rv = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) wait_queue_entry_t wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) if (count <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) * Reading returns if the pretimeout has gone off, and it only does
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) * it once per pretimeout.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) spin_lock_irq(&ipmi_read_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) if (!data_to_read) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (file->f_flags & O_NONBLOCK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) rv = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) init_waitqueue_entry(&wait, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) add_wait_queue(&read_q, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) while (!data_to_read) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) set_current_state(TASK_INTERRUPTIBLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) spin_unlock_irq(&ipmi_read_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) schedule();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) spin_lock_irq(&ipmi_read_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) remove_wait_queue(&read_q, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) if (signal_pending(current)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) rv = -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) data_to_read = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) spin_unlock_irq(&ipmi_read_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) if (rv == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (copy_to_user(buf, &data_to_read, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) rv = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) rv = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) static int ipmi_open(struct inode *ino, struct file *filep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) switch (iminor(ino)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) case WATCHDOG_MINOR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) if (test_and_set_bit(0, &ipmi_wdog_open))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) * Don't start the timer now, let it start on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) * first heartbeat.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) ipmi_start_timer_on_heartbeat = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) return stream_open(ino, filep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) return (-ENODEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) static __poll_t ipmi_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) __poll_t mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) poll_wait(file, &read_q, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) spin_lock_irq(&ipmi_read_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) if (data_to_read)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) mask |= (EPOLLIN | EPOLLRDNORM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) spin_unlock_irq(&ipmi_read_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) return mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) static int ipmi_fasync(int fd, struct file *file, int on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) result = fasync_helper(fd, file, on, &fasync_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) return (result);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) static int ipmi_close(struct inode *ino, struct file *filep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) if (iminor(ino) == WATCHDOG_MINOR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (expect_close == 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) mutex_lock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) _ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) mutex_unlock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) pr_crit("Unexpected close, not stopping watchdog!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) ipmi_heartbeat();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) clear_bit(0, &ipmi_wdog_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) static const struct file_operations ipmi_wdog_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) .read = ipmi_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) .poll = ipmi_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) .write = ipmi_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) .unlocked_ioctl = ipmi_unlocked_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) .open = ipmi_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) .release = ipmi_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) .fasync = ipmi_fasync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) static struct miscdevice ipmi_wdog_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) .fops = &ipmi_wdog_fops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) void *handler_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) if (msg->msg.cmd == IPMI_WDOG_RESET_TIMER &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) msg->msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) pr_info("response: The IPMI controller appears to have been reset, will attempt to reinitialize the watchdog timer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) else if (msg->msg.data[0] != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) pr_err("response: Error %x on cmd %x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) msg->msg.data[0],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) msg->msg.cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) ipmi_free_recv_msg(msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) static void ipmi_wdog_pretimeout_handler(void *handler_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) if (preaction_val != WDOG_PRETIMEOUT_NONE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) if (preop_val == WDOG_PREOP_PANIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) if (atomic_inc_and_test(&preop_panic_excl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) panic("Watchdog pre-timeout");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) } else if (preop_val == WDOG_PREOP_GIVE_DATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) spin_lock_irqsave(&ipmi_read_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) data_to_read = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) wake_up_interruptible(&read_q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) kill_fasync(&fasync_q, SIGIO, POLL_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) spin_unlock_irqrestore(&ipmi_read_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) * On some machines, the heartbeat will give an error and not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) * work unless we re-enable the timer. So do so.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) atomic_set(&pretimeout_since_last_heartbeat, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) static void ipmi_wdog_panic_handler(void *user_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) static int panic_event_handled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) * On a panic, if we have a panic timeout, make sure to extend
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) * the watchdog timer to a reasonable value to complete the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) * panic, if the watchdog timer is running. Plus the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) * pretimeout is meaningless at panic time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) if (watchdog_user && !panic_event_handled &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) /* Make sure we do this only once. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) panic_event_handled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) timeout = panic_wdt_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) pretimeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) panic_halt_ipmi_set_timeout();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) static const struct ipmi_user_hndl ipmi_hndlrs = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) .ipmi_recv_hndl = ipmi_wdog_msg_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) .ipmi_panic_handler = ipmi_wdog_panic_handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) static void ipmi_register_watchdog(int ipmi_intf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) int rv = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) if (watchdog_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) watchdog_ifnum = ipmi_intf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) if (rv < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) pr_crit("Unable to register with ipmi\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) rv = ipmi_get_version(watchdog_user,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) &ipmi_version_major,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) &ipmi_version_minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) pr_warn("Unable to get IPMI version, assuming 1.0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) ipmi_version_major = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) ipmi_version_minor = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) rv = misc_register(&ipmi_wdog_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) if (rv < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) ipmi_destroy_user(watchdog_user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) watchdog_user = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) pr_crit("Unable to register misc device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) #ifdef HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) if (nmi_handler_registered) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) int old_pretimeout = pretimeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) int old_timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) int old_preop_val = preop_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) * Set the pretimeout to go off in a second and give
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) * ourselves plenty of time to stop the timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) pretimeout = 99;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) timeout = 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) testing_nmi = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) pr_warn("Error starting timer to test NMI: 0x%x. The NMI pretimeout will likely not work\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) rv = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) goto out_restore;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) msleep(1500);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) if (testing_nmi != 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) pr_warn("IPMI NMI didn't seem to occur. The NMI pretimeout will likely not work\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) out_restore:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) testing_nmi = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) preop_val = old_preop_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) pretimeout = old_pretimeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) timeout = old_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) if ((start_now) && (rv == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) /* Run from startup, so start the timer now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) start_now = 0; /* Disable this function after first startup. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) ipmi_watchdog_state = action_val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) pr_info("Starting now!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) /* Stop the timer now. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) static void ipmi_unregister_watchdog(int ipmi_intf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) struct ipmi_user *loc_user = watchdog_user;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) if (!loc_user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) if (watchdog_ifnum != ipmi_intf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) /* Make sure no one can call us any more. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) misc_deregister(&ipmi_wdog_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) watchdog_user = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) * Wait to make sure the message makes it out. The lower layer has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) * pointers to our buffers, we want to make sure they are done before
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) * we release our memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) while (atomic_read(&msg_tofree))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) msg_free_smi(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) mutex_lock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) /* Disconnect from IPMI. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) rv = ipmi_destroy_user(loc_user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) if (rv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) pr_warn("error unlinking from IPMI: %d\n", rv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) /* If it comes back, restart it properly. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) ipmi_start_timer_on_heartbeat = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) mutex_unlock(&ipmi_watchdog_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) #ifdef HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) ipmi_nmi(unsigned int val, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) * If we get here, it's an NMI that's not a memory or I/O
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) * error. We can't truly tell if it's from IPMI or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) * without sending a message, and sending a message is almost
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) * impossible because of locking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) if (testing_nmi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) testing_nmi = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) return NMI_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) /* If we are not expecting a timeout, ignore it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) return NMI_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) if (preaction_val != WDOG_PRETIMEOUT_NMI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) return NMI_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) * If no one else handled the NMI, we assume it was the IPMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) * watchdog.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) if (preop_val == WDOG_PREOP_PANIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) /* On some machines, the heartbeat will give
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) an error and not work unless we re-enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) the timer. So do so. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) atomic_set(&pretimeout_since_last_heartbeat, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) if (atomic_inc_and_test(&preop_panic_excl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) nmi_panic(regs, "pre-timeout");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) return NMI_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) static int wdog_reboot_handler(struct notifier_block *this,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) unsigned long code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) static int reboot_event_handled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) if ((watchdog_user) && (!reboot_event_handled)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) /* Make sure we only do this once. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) reboot_event_handled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) if (code == SYS_POWER_OFF || code == SYS_HALT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) /* Disable the WDT if we are shutting down. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) /* Set a long timer to let the reboot happen or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) reset if it hangs, but only if the watchdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) timer was already running. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) if (timeout < 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) timeout = 120;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) pretimeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) static struct notifier_block wdog_reboot_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) .notifier_call = wdog_reboot_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) .next = NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) .priority = 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) static void ipmi_new_smi(int if_num, struct device *device)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) ipmi_register_watchdog(if_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) static void ipmi_smi_gone(int if_num)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) ipmi_unregister_watchdog(if_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) static struct ipmi_smi_watcher smi_watcher = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) .new_smi = ipmi_new_smi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) .smi_gone = ipmi_smi_gone
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) static int action_op(const char *inval, char *outval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) if (outval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) strcpy(outval, action);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) if (!inval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) if (strcmp(inval, "reset") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) action_val = WDOG_TIMEOUT_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) else if (strcmp(inval, "none") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) action_val = WDOG_TIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) else if (strcmp(inval, "power_cycle") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) action_val = WDOG_TIMEOUT_POWER_CYCLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) else if (strcmp(inval, "power_off") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) action_val = WDOG_TIMEOUT_POWER_DOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) strcpy(action, inval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) static int preaction_op(const char *inval, char *outval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) if (outval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) strcpy(outval, preaction);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) if (!inval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) if (strcmp(inval, "pre_none") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) preaction_val = WDOG_PRETIMEOUT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) else if (strcmp(inval, "pre_smi") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) preaction_val = WDOG_PRETIMEOUT_SMI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) #ifdef HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) else if (strcmp(inval, "pre_nmi") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) preaction_val = WDOG_PRETIMEOUT_NMI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) else if (strcmp(inval, "pre_int") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) preaction_val = WDOG_PRETIMEOUT_MSG_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) strcpy(preaction, inval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) static int preop_op(const char *inval, char *outval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) if (outval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) strcpy(outval, preop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) if (!inval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) if (strcmp(inval, "preop_none") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) preop_val = WDOG_PREOP_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) else if (strcmp(inval, "preop_panic") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) preop_val = WDOG_PREOP_PANIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) else if (strcmp(inval, "preop_give_data") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) preop_val = WDOG_PREOP_GIVE_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) strcpy(preop, inval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) static void check_parms(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) #ifdef HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) int do_nmi = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) if (preaction_val == WDOG_PRETIMEOUT_NMI) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) do_nmi = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) if (preop_val == WDOG_PREOP_GIVE_DATA) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) pr_warn("Pretimeout op is to give data but NMI pretimeout is enabled, setting pretimeout op to none\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) preop_op("preop_none", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) do_nmi = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) if (do_nmi && !nmi_handler_registered) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) rv = register_nmi_handler(NMI_UNKNOWN, ipmi_nmi, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) "ipmi");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) pr_warn("Can't register nmi handler\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) nmi_handler_registered = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) } else if (!do_nmi && nmi_handler_registered) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) unregister_nmi_handler(NMI_UNKNOWN, "ipmi");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) nmi_handler_registered = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) static int __init ipmi_wdog_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) if (action_op(action, NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) action_op("reset", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) pr_info("Unknown action '%s', defaulting to reset\n", action);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) if (preaction_op(preaction, NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) preaction_op("pre_none", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) pr_info("Unknown preaction '%s', defaulting to none\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) preaction);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) if (preop_op(preop, NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) preop_op("preop_none", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) pr_info("Unknown preop '%s', defaulting to none\n", preop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) check_parms();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) register_reboot_notifier(&wdog_reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) rv = ipmi_smi_watcher_register(&smi_watcher);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) if (rv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) #ifdef HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) if (nmi_handler_registered)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) unregister_nmi_handler(NMI_UNKNOWN, "ipmi");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) unregister_reboot_notifier(&wdog_reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) pr_warn("can't register smi watcher\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) pr_info("driver initialized\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) static void __exit ipmi_wdog_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) ipmi_smi_watcher_unregister(&smi_watcher);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) ipmi_unregister_watchdog(watchdog_ifnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) #ifdef HAVE_DIE_NMI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) if (nmi_handler_registered)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) unregister_nmi_handler(NMI_UNKNOWN, "ipmi");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) unregister_reboot_notifier(&wdog_reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) module_exit(ipmi_wdog_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) module_init(ipmi_wdog_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface.");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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