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1345 lines
32 KiB
1345 lines
32 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* ipmi_watchdog.c |
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* |
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* A watchdog timer based upon the IPMI interface. |
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* |
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* Author: MontaVista Software, Inc. |
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* Corey Minyard <[email protected]> |
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* [email protected] |
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* |
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* Copyright 2002 MontaVista Software Inc. |
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*/ |
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|
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#define pr_fmt(fmt) "IPMI Watchdog: " fmt |
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|
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/ipmi.h> |
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#include <linux/ipmi_smi.h> |
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#include <linux/mutex.h> |
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#include <linux/watchdog.h> |
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#include <linux/miscdevice.h> |
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#include <linux/init.h> |
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#include <linux/completion.h> |
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#include <linux/kdebug.h> |
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#include <linux/rwsem.h> |
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#include <linux/errno.h> |
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#include <linux/uaccess.h> |
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#include <linux/notifier.h> |
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#include <linux/nmi.h> |
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#include <linux/reboot.h> |
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#include <linux/wait.h> |
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#include <linux/poll.h> |
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#include <linux/string.h> |
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#include <linux/ctype.h> |
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#include <linux/delay.h> |
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#include <linux/atomic.h> |
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#include <linux/sched/signal.h> |
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|
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#ifdef CONFIG_X86 |
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/* |
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* This is ugly, but I've determined that x86 is the only architecture |
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* that can reasonably support the IPMI NMI watchdog timeout at this |
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* time. If another architecture adds this capability somehow, it |
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* will have to be a somewhat different mechanism and I have no idea |
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* how it will work. So in the unlikely event that another |
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* architecture supports this, we can figure out a good generic |
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* mechanism for it at that time. |
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*/ |
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#include <asm/kdebug.h> |
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#include <asm/nmi.h> |
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#define HAVE_DIE_NMI |
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#endif |
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|
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/* |
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* The IPMI command/response information for the watchdog timer. |
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*/ |
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|
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/* values for byte 1 of the set command, byte 2 of the get response. */ |
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#define WDOG_DONT_LOG (1 << 7) |
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#define WDOG_DONT_STOP_ON_SET (1 << 6) |
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#define WDOG_SET_TIMER_USE(byte, use) \ |
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byte = ((byte) & 0xf8) | ((use) & 0x7) |
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#define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7) |
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#define WDOG_TIMER_USE_BIOS_FRB2 1 |
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#define WDOG_TIMER_USE_BIOS_POST 2 |
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#define WDOG_TIMER_USE_OS_LOAD 3 |
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#define WDOG_TIMER_USE_SMS_OS 4 |
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#define WDOG_TIMER_USE_OEM 5 |
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|
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/* values for byte 2 of the set command, byte 3 of the get response. */ |
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#define WDOG_SET_PRETIMEOUT_ACT(byte, use) \ |
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byte = ((byte) & 0x8f) | (((use) & 0x7) << 4) |
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#define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7) |
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#define WDOG_PRETIMEOUT_NONE 0 |
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#define WDOG_PRETIMEOUT_SMI 1 |
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#define WDOG_PRETIMEOUT_NMI 2 |
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#define WDOG_PRETIMEOUT_MSG_INT 3 |
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|
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/* Operations that can be performed on a pretimout. */ |
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#define WDOG_PREOP_NONE 0 |
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#define WDOG_PREOP_PANIC 1 |
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/* Cause data to be available to read. Doesn't work in NMI mode. */ |
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#define WDOG_PREOP_GIVE_DATA 2 |
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|
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/* Actions to perform on a full timeout. */ |
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#define WDOG_SET_TIMEOUT_ACT(byte, use) \ |
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byte = ((byte) & 0xf8) | ((use) & 0x7) |
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#define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7) |
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#define WDOG_TIMEOUT_NONE 0 |
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#define WDOG_TIMEOUT_RESET 1 |
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#define WDOG_TIMEOUT_POWER_DOWN 2 |
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#define WDOG_TIMEOUT_POWER_CYCLE 3 |
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|
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/* |
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* Byte 3 of the get command, byte 4 of the get response is the |
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* pre-timeout in seconds. |
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*/ |
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|
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/* Bits for setting byte 4 of the set command, byte 5 of the get response. */ |
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#define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1) |
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#define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2) |
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#define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3) |
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#define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4) |
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#define WDOG_EXPIRE_CLEAR_OEM (1 << 5) |
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|
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/* |
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* Setting/getting the watchdog timer value. This is for bytes 5 and |
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* 6 (the timeout time) of the set command, and bytes 6 and 7 (the |
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* timeout time) and 8 and 9 (the current countdown value) of the |
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* response. The timeout value is given in seconds (in the command it |
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* is 100ms intervals). |
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*/ |
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#define WDOG_SET_TIMEOUT(byte1, byte2, val) \ |
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(byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8) |
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#define WDOG_GET_TIMEOUT(byte1, byte2) \ |
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(((byte1) | ((byte2) << 8)) / 10) |
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|
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#define IPMI_WDOG_RESET_TIMER 0x22 |
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#define IPMI_WDOG_SET_TIMER 0x24 |
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#define IPMI_WDOG_GET_TIMER 0x25 |
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|
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#define IPMI_WDOG_TIMER_NOT_INIT_RESP 0x80 |
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|
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static DEFINE_MUTEX(ipmi_watchdog_mutex); |
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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|
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static struct ipmi_user *watchdog_user; |
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static int watchdog_ifnum; |
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|
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/* Default the timeout to 10 seconds. */ |
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static int timeout = 10; |
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|
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/* The pre-timeout is disabled by default. */ |
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static int pretimeout; |
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|
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/* Default timeout to set on panic */ |
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static int panic_wdt_timeout = 255; |
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|
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/* Default action is to reset the board on a timeout. */ |
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static unsigned char action_val = WDOG_TIMEOUT_RESET; |
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static char action[16] = "reset"; |
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|
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static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE; |
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|
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static char preaction[16] = "pre_none"; |
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static unsigned char preop_val = WDOG_PREOP_NONE; |
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|
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static char preop[16] = "preop_none"; |
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static DEFINE_SPINLOCK(ipmi_read_lock); |
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static char data_to_read; |
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static DECLARE_WAIT_QUEUE_HEAD(read_q); |
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static struct fasync_struct *fasync_q; |
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static atomic_t pretimeout_since_last_heartbeat; |
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static char expect_close; |
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|
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static int ifnum_to_use = -1; |
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|
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/* Parameters to ipmi_set_timeout */ |
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#define IPMI_SET_TIMEOUT_NO_HB 0 |
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#define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1 |
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#define IPMI_SET_TIMEOUT_FORCE_HB 2 |
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static int ipmi_set_timeout(int do_heartbeat); |
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static void ipmi_register_watchdog(int ipmi_intf); |
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static void ipmi_unregister_watchdog(int ipmi_intf); |
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|
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/* |
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* If true, the driver will start running as soon as it is configured |
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* and ready. |
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*/ |
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static int start_now; |
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|
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static int set_param_timeout(const char *val, const struct kernel_param *kp) |
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{ |
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char *endp; |
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int l; |
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int rv = 0; |
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|
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if (!val) |
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return -EINVAL; |
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l = simple_strtoul(val, &endp, 0); |
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if (endp == val) |
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return -EINVAL; |
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*((int *)kp->arg) = l; |
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if (watchdog_user) |
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rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
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return rv; |
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} |
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static const struct kernel_param_ops param_ops_timeout = { |
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.set = set_param_timeout, |
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.get = param_get_int, |
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}; |
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#define param_check_timeout param_check_int |
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|
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typedef int (*action_fn)(const char *intval, char *outval); |
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static int action_op(const char *inval, char *outval); |
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static int preaction_op(const char *inval, char *outval); |
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static int preop_op(const char *inval, char *outval); |
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static void check_parms(void); |
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|
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static int set_param_str(const char *val, const struct kernel_param *kp) |
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{ |
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action_fn fn = (action_fn) kp->arg; |
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int rv = 0; |
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char valcp[16]; |
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char *s; |
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strncpy(valcp, val, 15); |
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valcp[15] = '\0'; |
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s = strstrip(valcp); |
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|
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rv = fn(s, NULL); |
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if (rv) |
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goto out; |
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check_parms(); |
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if (watchdog_user) |
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rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
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|
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out: |
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return rv; |
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} |
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|
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static int get_param_str(char *buffer, const struct kernel_param *kp) |
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{ |
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action_fn fn = (action_fn) kp->arg; |
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int rv, len; |
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rv = fn(NULL, buffer); |
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if (rv) |
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return rv; |
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len = strlen(buffer); |
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buffer[len++] = '\n'; |
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buffer[len] = 0; |
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return len; |
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} |
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static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp) |
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{ |
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int rv = param_set_int(val, kp); |
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if (rv) |
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return rv; |
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if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum)) |
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return 0; |
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ipmi_unregister_watchdog(watchdog_ifnum); |
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ipmi_register_watchdog(ifnum_to_use); |
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return 0; |
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} |
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static const struct kernel_param_ops param_ops_wdog_ifnum = { |
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.set = set_param_wdog_ifnum, |
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.get = param_get_int, |
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}; |
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#define param_check_wdog_ifnum param_check_int |
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static const struct kernel_param_ops param_ops_str = { |
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.set = set_param_str, |
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.get = get_param_str, |
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}; |
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module_param(ifnum_to_use, wdog_ifnum, 0644); |
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MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog " |
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"timer. Setting to -1 defaults to the first registered " |
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"interface"); |
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module_param(timeout, timeout, 0644); |
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MODULE_PARM_DESC(timeout, "Timeout value in seconds."); |
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module_param(pretimeout, timeout, 0644); |
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MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); |
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module_param(panic_wdt_timeout, timeout, 0644); |
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MODULE_PARM_DESC(panic_wdt_timeout, "Timeout value on kernel panic in seconds."); |
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module_param_cb(action, ¶m_ops_str, action_op, 0644); |
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MODULE_PARM_DESC(action, "Timeout action. One of: " |
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"reset, none, power_cycle, power_off."); |
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module_param_cb(preaction, ¶m_ops_str, preaction_op, 0644); |
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MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " |
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"pre_none, pre_smi, pre_nmi, pre_int."); |
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module_param_cb(preop, ¶m_ops_str, preop_op, 0644); |
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MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " |
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"preop_none, preop_panic, preop_give_data."); |
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module_param(start_now, int, 0444); |
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MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" |
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"soon as the driver is loaded."); |
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module_param(nowayout, bool, 0644); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
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"(default=CONFIG_WATCHDOG_NOWAYOUT)"); |
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/* Default state of the timer. */ |
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static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
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/* Is someone using the watchdog? Only one user is allowed. */ |
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static unsigned long ipmi_wdog_open; |
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/* |
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* If set to 1, the heartbeat command will set the state to reset and |
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* start the timer. The timer doesn't normally run when the driver is |
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* first opened until the heartbeat is set the first time, this |
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* variable is used to accomplish this. |
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*/ |
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static int ipmi_start_timer_on_heartbeat; |
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|
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/* IPMI version of the BMC. */ |
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static unsigned char ipmi_version_major; |
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static unsigned char ipmi_version_minor; |
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|
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/* If a pretimeout occurs, this is used to allow only one panic to happen. */ |
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static atomic_t preop_panic_excl = ATOMIC_INIT(-1); |
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#ifdef HAVE_DIE_NMI |
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static int testing_nmi; |
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static int nmi_handler_registered; |
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#endif |
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static int __ipmi_heartbeat(void); |
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|
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/* |
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* We use a mutex to make sure that only one thing can send a set a |
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* message at one time. The mutex is claimed when a message is sent |
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* and freed when both the send and receive messages are free. |
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*/ |
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static atomic_t msg_tofree = ATOMIC_INIT(0); |
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static DECLARE_COMPLETION(msg_wait); |
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static void msg_free_smi(struct ipmi_smi_msg *msg) |
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{ |
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if (atomic_dec_and_test(&msg_tofree)) |
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complete(&msg_wait); |
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} |
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static void msg_free_recv(struct ipmi_recv_msg *msg) |
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{ |
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if (atomic_dec_and_test(&msg_tofree)) |
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complete(&msg_wait); |
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} |
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static struct ipmi_smi_msg smi_msg = { |
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.done = msg_free_smi |
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}; |
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static struct ipmi_recv_msg recv_msg = { |
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.done = msg_free_recv |
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}; |
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|
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static int __ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, |
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struct ipmi_recv_msg *recv_msg, |
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int *send_heartbeat_now) |
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{ |
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struct kernel_ipmi_msg msg; |
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unsigned char data[6]; |
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int rv; |
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struct ipmi_system_interface_addr addr; |
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int hbnow = 0; |
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|
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data[0] = 0; |
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WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); |
|
|
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if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
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if ((ipmi_version_major > 1) || |
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((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) { |
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/* This is an IPMI 1.5-only feature. */ |
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data[0] |= WDOG_DONT_STOP_ON_SET; |
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} else { |
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/* |
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* In ipmi 1.0, setting the timer stops the watchdog, we |
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* need to start it back up again. |
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*/ |
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hbnow = 1; |
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} |
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} |
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|
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data[1] = 0; |
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WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); |
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if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) { |
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WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); |
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data[2] = pretimeout; |
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} else { |
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WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); |
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data[2] = 0; /* No pretimeout. */ |
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} |
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data[3] = 0; |
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WDOG_SET_TIMEOUT(data[4], data[5], timeout); |
|
|
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addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
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addr.channel = IPMI_BMC_CHANNEL; |
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addr.lun = 0; |
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|
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msg.netfn = 0x06; |
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msg.cmd = IPMI_WDOG_SET_TIMER; |
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msg.data = data; |
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msg.data_len = sizeof(data); |
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rv = ipmi_request_supply_msgs(watchdog_user, |
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(struct ipmi_addr *) &addr, |
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0, |
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&msg, |
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NULL, |
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smi_msg, |
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recv_msg, |
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1); |
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if (rv) |
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pr_warn("set timeout error: %d\n", rv); |
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else if (send_heartbeat_now) |
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*send_heartbeat_now = hbnow; |
|
|
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return rv; |
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} |
|
|
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static int _ipmi_set_timeout(int do_heartbeat) |
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{ |
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int send_heartbeat_now; |
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int rv; |
|
|
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if (!watchdog_user) |
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return -ENODEV; |
|
|
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atomic_set(&msg_tofree, 2); |
|
|
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rv = __ipmi_set_timeout(&smi_msg, |
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&recv_msg, |
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&send_heartbeat_now); |
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if (rv) |
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return rv; |
|
|
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wait_for_completion(&msg_wait); |
|
|
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if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) |
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|| ((send_heartbeat_now) |
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&& (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) |
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rv = __ipmi_heartbeat(); |
|
|
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return rv; |
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} |
|
|
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static int ipmi_set_timeout(int do_heartbeat) |
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{ |
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int rv; |
|
|
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mutex_lock(&ipmi_watchdog_mutex); |
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rv = _ipmi_set_timeout(do_heartbeat); |
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mutex_unlock(&ipmi_watchdog_mutex); |
|
|
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return rv; |
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} |
|
|
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static atomic_t panic_done_count = ATOMIC_INIT(0); |
|
|
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static void panic_smi_free(struct ipmi_smi_msg *msg) |
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{ |
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atomic_dec(&panic_done_count); |
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} |
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static void panic_recv_free(struct ipmi_recv_msg *msg) |
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{ |
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atomic_dec(&panic_done_count); |
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} |
|
|
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static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = { |
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.done = panic_smi_free |
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}; |
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static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = { |
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.done = panic_recv_free |
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}; |
|
|
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static void panic_halt_ipmi_heartbeat(void) |
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{ |
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struct kernel_ipmi_msg msg; |
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struct ipmi_system_interface_addr addr; |
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int rv; |
|
|
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/* |
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* Don't reset the timer if we have the timer turned off, that |
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* re-enables the watchdog. |
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*/ |
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
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return; |
|
|
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addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
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addr.channel = IPMI_BMC_CHANNEL; |
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addr.lun = 0; |
|
|
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msg.netfn = 0x06; |
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msg.cmd = IPMI_WDOG_RESET_TIMER; |
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msg.data = NULL; |
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msg.data_len = 0; |
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atomic_inc(&panic_done_count); |
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rv = ipmi_request_supply_msgs(watchdog_user, |
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(struct ipmi_addr *) &addr, |
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0, |
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&msg, |
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NULL, |
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&panic_halt_heartbeat_smi_msg, |
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&panic_halt_heartbeat_recv_msg, |
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1); |
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if (rv) |
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atomic_dec(&panic_done_count); |
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} |
|
|
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static struct ipmi_smi_msg panic_halt_smi_msg = { |
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.done = panic_smi_free |
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}; |
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static struct ipmi_recv_msg panic_halt_recv_msg = { |
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.done = panic_recv_free |
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}; |
|
|
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/* |
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* Special call, doesn't claim any locks. This is only to be called |
|
* at panic or halt time, in run-to-completion mode, when the caller |
|
* is the only CPU and the only thing that will be going is these IPMI |
|
* calls. |
|
*/ |
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static void panic_halt_ipmi_set_timeout(void) |
|
{ |
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int send_heartbeat_now; |
|
int rv; |
|
|
|
/* Wait for the messages to be free. */ |
|
while (atomic_read(&panic_done_count) != 0) |
|
ipmi_poll_interface(watchdog_user); |
|
atomic_inc(&panic_done_count); |
|
rv = __ipmi_set_timeout(&panic_halt_smi_msg, |
|
&panic_halt_recv_msg, |
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&send_heartbeat_now); |
|
if (rv) { |
|
atomic_dec(&panic_done_count); |
|
pr_warn("Unable to extend the watchdog timeout\n"); |
|
} else { |
|
if (send_heartbeat_now) |
|
panic_halt_ipmi_heartbeat(); |
|
} |
|
while (atomic_read(&panic_done_count) != 0) |
|
ipmi_poll_interface(watchdog_user); |
|
} |
|
|
|
static int __ipmi_heartbeat(void) |
|
{ |
|
struct kernel_ipmi_msg msg; |
|
int rv; |
|
struct ipmi_system_interface_addr addr; |
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int timeout_retries = 0; |
|
|
|
restart: |
|
/* |
|
* Don't reset the timer if we have the timer turned off, that |
|
* re-enables the watchdog. |
|
*/ |
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
|
return 0; |
|
|
|
atomic_set(&msg_tofree, 2); |
|
|
|
addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; |
|
addr.channel = IPMI_BMC_CHANNEL; |
|
addr.lun = 0; |
|
|
|
msg.netfn = 0x06; |
|
msg.cmd = IPMI_WDOG_RESET_TIMER; |
|
msg.data = NULL; |
|
msg.data_len = 0; |
|
rv = ipmi_request_supply_msgs(watchdog_user, |
|
(struct ipmi_addr *) &addr, |
|
0, |
|
&msg, |
|
NULL, |
|
&smi_msg, |
|
&recv_msg, |
|
1); |
|
if (rv) { |
|
pr_warn("heartbeat send failure: %d\n", rv); |
|
return rv; |
|
} |
|
|
|
/* Wait for the heartbeat to be sent. */ |
|
wait_for_completion(&msg_wait); |
|
|
|
if (recv_msg.msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) { |
|
timeout_retries++; |
|
if (timeout_retries > 3) { |
|
pr_err("Unable to restore the IPMI watchdog's settings, giving up\n"); |
|
rv = -EIO; |
|
goto out; |
|
} |
|
|
|
/* |
|
* The timer was not initialized, that means the BMC was |
|
* probably reset and lost the watchdog information. Attempt |
|
* to restore the timer's info. Note that we still hold |
|
* the heartbeat lock, to keep a heartbeat from happening |
|
* in this process, so must say no heartbeat to avoid a |
|
* deadlock on this mutex |
|
*/ |
|
rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
|
if (rv) { |
|
pr_err("Unable to send the command to set the watchdog's settings, giving up\n"); |
|
goto out; |
|
} |
|
|
|
/* Might need a heartbeat send, go ahead and do it. */ |
|
goto restart; |
|
} else if (recv_msg.msg.data[0] != 0) { |
|
/* |
|
* Got an error in the heartbeat response. It was already |
|
* reported in ipmi_wdog_msg_handler, but we should return |
|
* an error here. |
|
*/ |
|
rv = -EINVAL; |
|
} |
|
|
|
out: |
|
return rv; |
|
} |
|
|
|
static int _ipmi_heartbeat(void) |
|
{ |
|
int rv; |
|
|
|
if (!watchdog_user) |
|
return -ENODEV; |
|
|
|
if (ipmi_start_timer_on_heartbeat) { |
|
ipmi_start_timer_on_heartbeat = 0; |
|
ipmi_watchdog_state = action_val; |
|
rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
|
} else if (atomic_cmpxchg(&pretimeout_since_last_heartbeat, 1, 0)) { |
|
/* |
|
* A pretimeout occurred, make sure we set the timeout. |
|
* We don't want to set the action, though, we want to |
|
* leave that alone (thus it can't be combined with the |
|
* above operation. |
|
*/ |
|
rv = _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
|
} else { |
|
rv = __ipmi_heartbeat(); |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
static int ipmi_heartbeat(void) |
|
{ |
|
int rv; |
|
|
|
mutex_lock(&ipmi_watchdog_mutex); |
|
rv = _ipmi_heartbeat(); |
|
mutex_unlock(&ipmi_watchdog_mutex); |
|
|
|
return rv; |
|
} |
|
|
|
static struct watchdog_info ident = { |
|
.options = 0, /* WDIOF_SETTIMEOUT, */ |
|
.firmware_version = 1, |
|
.identity = "IPMI" |
|
}; |
|
|
|
static int ipmi_ioctl(struct file *file, |
|
unsigned int cmd, unsigned long arg) |
|
{ |
|
void __user *argp = (void __user *)arg; |
|
int i; |
|
int val; |
|
|
|
switch (cmd) { |
|
case WDIOC_GETSUPPORT: |
|
i = copy_to_user(argp, &ident, sizeof(ident)); |
|
return i ? -EFAULT : 0; |
|
|
|
case WDIOC_SETTIMEOUT: |
|
i = copy_from_user(&val, argp, sizeof(int)); |
|
if (i) |
|
return -EFAULT; |
|
timeout = val; |
|
return _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
|
|
|
case WDIOC_GETTIMEOUT: |
|
i = copy_to_user(argp, &timeout, sizeof(timeout)); |
|
if (i) |
|
return -EFAULT; |
|
return 0; |
|
|
|
case WDIOC_SETPRETIMEOUT: |
|
i = copy_from_user(&val, argp, sizeof(int)); |
|
if (i) |
|
return -EFAULT; |
|
pretimeout = val; |
|
return _ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
|
|
|
case WDIOC_GETPRETIMEOUT: |
|
i = copy_to_user(argp, &pretimeout, sizeof(pretimeout)); |
|
if (i) |
|
return -EFAULT; |
|
return 0; |
|
|
|
case WDIOC_KEEPALIVE: |
|
return _ipmi_heartbeat(); |
|
|
|
case WDIOC_SETOPTIONS: |
|
i = copy_from_user(&val, argp, sizeof(int)); |
|
if (i) |
|
return -EFAULT; |
|
if (val & WDIOS_DISABLECARD) { |
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
|
_ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
|
ipmi_start_timer_on_heartbeat = 0; |
|
} |
|
|
|
if (val & WDIOS_ENABLECARD) { |
|
ipmi_watchdog_state = action_val; |
|
_ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
|
} |
|
return 0; |
|
|
|
case WDIOC_GETSTATUS: |
|
val = 0; |
|
i = copy_to_user(argp, &val, sizeof(val)); |
|
if (i) |
|
return -EFAULT; |
|
return 0; |
|
|
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
} |
|
|
|
static long ipmi_unlocked_ioctl(struct file *file, |
|
unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&ipmi_watchdog_mutex); |
|
ret = ipmi_ioctl(file, cmd, arg); |
|
mutex_unlock(&ipmi_watchdog_mutex); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t ipmi_write(struct file *file, |
|
const char __user *buf, |
|
size_t len, |
|
loff_t *ppos) |
|
{ |
|
int rv; |
|
|
|
if (len) { |
|
if (!nowayout) { |
|
size_t i; |
|
|
|
/* In case it was set long ago */ |
|
expect_close = 0; |
|
|
|
for (i = 0; i != len; i++) { |
|
char c; |
|
|
|
if (get_user(c, buf + i)) |
|
return -EFAULT; |
|
if (c == 'V') |
|
expect_close = 42; |
|
} |
|
} |
|
rv = ipmi_heartbeat(); |
|
if (rv) |
|
return rv; |
|
} |
|
return len; |
|
} |
|
|
|
static ssize_t ipmi_read(struct file *file, |
|
char __user *buf, |
|
size_t count, |
|
loff_t *ppos) |
|
{ |
|
int rv = 0; |
|
wait_queue_entry_t wait; |
|
|
|
if (count <= 0) |
|
return 0; |
|
|
|
/* |
|
* Reading returns if the pretimeout has gone off, and it only does |
|
* it once per pretimeout. |
|
*/ |
|
spin_lock_irq(&ipmi_read_lock); |
|
if (!data_to_read) { |
|
if (file->f_flags & O_NONBLOCK) { |
|
rv = -EAGAIN; |
|
goto out; |
|
} |
|
|
|
init_waitqueue_entry(&wait, current); |
|
add_wait_queue(&read_q, &wait); |
|
while (!data_to_read) { |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
spin_unlock_irq(&ipmi_read_lock); |
|
schedule(); |
|
spin_lock_irq(&ipmi_read_lock); |
|
} |
|
remove_wait_queue(&read_q, &wait); |
|
|
|
if (signal_pending(current)) { |
|
rv = -ERESTARTSYS; |
|
goto out; |
|
} |
|
} |
|
data_to_read = 0; |
|
|
|
out: |
|
spin_unlock_irq(&ipmi_read_lock); |
|
|
|
if (rv == 0) { |
|
if (copy_to_user(buf, &data_to_read, 1)) |
|
rv = -EFAULT; |
|
else |
|
rv = 1; |
|
} |
|
|
|
return rv; |
|
} |
|
|
|
static int ipmi_open(struct inode *ino, struct file *filep) |
|
{ |
|
switch (iminor(ino)) { |
|
case WATCHDOG_MINOR: |
|
if (test_and_set_bit(0, &ipmi_wdog_open)) |
|
return -EBUSY; |
|
|
|
|
|
/* |
|
* Don't start the timer now, let it start on the |
|
* first heartbeat. |
|
*/ |
|
ipmi_start_timer_on_heartbeat = 1; |
|
return stream_open(ino, filep); |
|
|
|
default: |
|
return (-ENODEV); |
|
} |
|
} |
|
|
|
static __poll_t ipmi_poll(struct file *file, poll_table *wait) |
|
{ |
|
__poll_t mask = 0; |
|
|
|
poll_wait(file, &read_q, wait); |
|
|
|
spin_lock_irq(&ipmi_read_lock); |
|
if (data_to_read) |
|
mask |= (EPOLLIN | EPOLLRDNORM); |
|
spin_unlock_irq(&ipmi_read_lock); |
|
|
|
return mask; |
|
} |
|
|
|
static int ipmi_fasync(int fd, struct file *file, int on) |
|
{ |
|
int result; |
|
|
|
result = fasync_helper(fd, file, on, &fasync_q); |
|
|
|
return (result); |
|
} |
|
|
|
static int ipmi_close(struct inode *ino, struct file *filep) |
|
{ |
|
if (iminor(ino) == WATCHDOG_MINOR) { |
|
if (expect_close == 42) { |
|
mutex_lock(&ipmi_watchdog_mutex); |
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
|
_ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
|
mutex_unlock(&ipmi_watchdog_mutex); |
|
} else { |
|
pr_crit("Unexpected close, not stopping watchdog!\n"); |
|
ipmi_heartbeat(); |
|
} |
|
clear_bit(0, &ipmi_wdog_open); |
|
} |
|
|
|
expect_close = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static const struct file_operations ipmi_wdog_fops = { |
|
.owner = THIS_MODULE, |
|
.read = ipmi_read, |
|
.poll = ipmi_poll, |
|
.write = ipmi_write, |
|
.unlocked_ioctl = ipmi_unlocked_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.open = ipmi_open, |
|
.release = ipmi_close, |
|
.fasync = ipmi_fasync, |
|
.llseek = no_llseek, |
|
}; |
|
|
|
static struct miscdevice ipmi_wdog_miscdev = { |
|
.minor = WATCHDOG_MINOR, |
|
.name = "watchdog", |
|
.fops = &ipmi_wdog_fops |
|
}; |
|
|
|
static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg, |
|
void *handler_data) |
|
{ |
|
if (msg->msg.cmd == IPMI_WDOG_RESET_TIMER && |
|
msg->msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) |
|
pr_info("response: The IPMI controller appears to have been reset, will attempt to reinitialize the watchdog timer\n"); |
|
else if (msg->msg.data[0] != 0) |
|
pr_err("response: Error %x on cmd %x\n", |
|
msg->msg.data[0], |
|
msg->msg.cmd); |
|
|
|
ipmi_free_recv_msg(msg); |
|
} |
|
|
|
static void ipmi_wdog_pretimeout_handler(void *handler_data) |
|
{ |
|
if (preaction_val != WDOG_PRETIMEOUT_NONE) { |
|
if (preop_val == WDOG_PREOP_PANIC) { |
|
if (atomic_inc_and_test(&preop_panic_excl)) |
|
panic("Watchdog pre-timeout"); |
|
} else if (preop_val == WDOG_PREOP_GIVE_DATA) { |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ipmi_read_lock, flags); |
|
data_to_read = 1; |
|
wake_up_interruptible(&read_q); |
|
kill_fasync(&fasync_q, SIGIO, POLL_IN); |
|
spin_unlock_irqrestore(&ipmi_read_lock, flags); |
|
} |
|
} |
|
|
|
/* |
|
* On some machines, the heartbeat will give an error and not |
|
* work unless we re-enable the timer. So do so. |
|
*/ |
|
atomic_set(&pretimeout_since_last_heartbeat, 1); |
|
} |
|
|
|
static void ipmi_wdog_panic_handler(void *user_data) |
|
{ |
|
static int panic_event_handled; |
|
|
|
/* |
|
* On a panic, if we have a panic timeout, make sure to extend |
|
* the watchdog timer to a reasonable value to complete the |
|
* panic, if the watchdog timer is running. Plus the |
|
* pretimeout is meaningless at panic time. |
|
*/ |
|
if (watchdog_user && !panic_event_handled && |
|
ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
|
/* Make sure we do this only once. */ |
|
panic_event_handled = 1; |
|
|
|
timeout = panic_wdt_timeout; |
|
pretimeout = 0; |
|
panic_halt_ipmi_set_timeout(); |
|
} |
|
} |
|
|
|
static const struct ipmi_user_hndl ipmi_hndlrs = { |
|
.ipmi_recv_hndl = ipmi_wdog_msg_handler, |
|
.ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler, |
|
.ipmi_panic_handler = ipmi_wdog_panic_handler |
|
}; |
|
|
|
static void ipmi_register_watchdog(int ipmi_intf) |
|
{ |
|
int rv = -EBUSY; |
|
|
|
if (watchdog_user) |
|
goto out; |
|
|
|
if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf)) |
|
goto out; |
|
|
|
watchdog_ifnum = ipmi_intf; |
|
|
|
rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user); |
|
if (rv < 0) { |
|
pr_crit("Unable to register with ipmi\n"); |
|
goto out; |
|
} |
|
|
|
rv = ipmi_get_version(watchdog_user, |
|
&ipmi_version_major, |
|
&ipmi_version_minor); |
|
if (rv) { |
|
pr_warn("Unable to get IPMI version, assuming 1.0\n"); |
|
ipmi_version_major = 1; |
|
ipmi_version_minor = 0; |
|
} |
|
|
|
rv = misc_register(&ipmi_wdog_miscdev); |
|
if (rv < 0) { |
|
ipmi_destroy_user(watchdog_user); |
|
watchdog_user = NULL; |
|
pr_crit("Unable to register misc device\n"); |
|
} |
|
|
|
#ifdef HAVE_DIE_NMI |
|
if (nmi_handler_registered) { |
|
int old_pretimeout = pretimeout; |
|
int old_timeout = timeout; |
|
int old_preop_val = preop_val; |
|
|
|
/* |
|
* Set the pretimeout to go off in a second and give |
|
* ourselves plenty of time to stop the timer. |
|
*/ |
|
ipmi_watchdog_state = WDOG_TIMEOUT_RESET; |
|
preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */ |
|
pretimeout = 99; |
|
timeout = 100; |
|
|
|
testing_nmi = 1; |
|
|
|
rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
|
if (rv) { |
|
pr_warn("Error starting timer to test NMI: 0x%x. The NMI pretimeout will likely not work\n", |
|
rv); |
|
rv = 0; |
|
goto out_restore; |
|
} |
|
|
|
msleep(1500); |
|
|
|
if (testing_nmi != 2) { |
|
pr_warn("IPMI NMI didn't seem to occur. The NMI pretimeout will likely not work\n"); |
|
} |
|
out_restore: |
|
testing_nmi = 0; |
|
preop_val = old_preop_val; |
|
pretimeout = old_pretimeout; |
|
timeout = old_timeout; |
|
} |
|
#endif |
|
|
|
out: |
|
if ((start_now) && (rv == 0)) { |
|
/* Run from startup, so start the timer now. */ |
|
start_now = 0; /* Disable this function after first startup. */ |
|
ipmi_watchdog_state = action_val; |
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); |
|
pr_info("Starting now!\n"); |
|
} else { |
|
/* Stop the timer now. */ |
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
|
} |
|
} |
|
|
|
static void ipmi_unregister_watchdog(int ipmi_intf) |
|
{ |
|
int rv; |
|
struct ipmi_user *loc_user = watchdog_user; |
|
|
|
if (!loc_user) |
|
return; |
|
|
|
if (watchdog_ifnum != ipmi_intf) |
|
return; |
|
|
|
/* Make sure no one can call us any more. */ |
|
misc_deregister(&ipmi_wdog_miscdev); |
|
|
|
watchdog_user = NULL; |
|
|
|
/* |
|
* Wait to make sure the message makes it out. The lower layer has |
|
* pointers to our buffers, we want to make sure they are done before |
|
* we release our memory. |
|
*/ |
|
while (atomic_read(&msg_tofree)) |
|
msg_free_smi(NULL); |
|
|
|
mutex_lock(&ipmi_watchdog_mutex); |
|
|
|
/* Disconnect from IPMI. */ |
|
rv = ipmi_destroy_user(loc_user); |
|
if (rv) |
|
pr_warn("error unlinking from IPMI: %d\n", rv); |
|
|
|
/* If it comes back, restart it properly. */ |
|
ipmi_start_timer_on_heartbeat = 1; |
|
|
|
mutex_unlock(&ipmi_watchdog_mutex); |
|
} |
|
|
|
#ifdef HAVE_DIE_NMI |
|
static int |
|
ipmi_nmi(unsigned int val, struct pt_regs *regs) |
|
{ |
|
/* |
|
* If we get here, it's an NMI that's not a memory or I/O |
|
* error. We can't truly tell if it's from IPMI or not |
|
* without sending a message, and sending a message is almost |
|
* impossible because of locking. |
|
*/ |
|
|
|
if (testing_nmi) { |
|
testing_nmi = 2; |
|
return NMI_HANDLED; |
|
} |
|
|
|
/* If we are not expecting a timeout, ignore it. */ |
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
|
return NMI_DONE; |
|
|
|
if (preaction_val != WDOG_PRETIMEOUT_NMI) |
|
return NMI_DONE; |
|
|
|
/* |
|
* If no one else handled the NMI, we assume it was the IPMI |
|
* watchdog. |
|
*/ |
|
if (preop_val == WDOG_PREOP_PANIC) { |
|
/* On some machines, the heartbeat will give |
|
an error and not work unless we re-enable |
|
the timer. So do so. */ |
|
atomic_set(&pretimeout_since_last_heartbeat, 1); |
|
if (atomic_inc_and_test(&preop_panic_excl)) |
|
nmi_panic(regs, "pre-timeout"); |
|
} |
|
|
|
return NMI_HANDLED; |
|
} |
|
#endif |
|
|
|
static int wdog_reboot_handler(struct notifier_block *this, |
|
unsigned long code, |
|
void *unused) |
|
{ |
|
static int reboot_event_handled; |
|
|
|
if ((watchdog_user) && (!reboot_event_handled)) { |
|
/* Make sure we only do this once. */ |
|
reboot_event_handled = 1; |
|
|
|
if (code == SYS_POWER_OFF || code == SYS_HALT) { |
|
/* Disable the WDT if we are shutting down. */ |
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
|
} else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
|
/* Set a long timer to let the reboot happen or |
|
reset if it hangs, but only if the watchdog |
|
timer was already running. */ |
|
if (timeout < 120) |
|
timeout = 120; |
|
pretimeout = 0; |
|
ipmi_watchdog_state = WDOG_TIMEOUT_RESET; |
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
|
} |
|
} |
|
return NOTIFY_OK; |
|
} |
|
|
|
static struct notifier_block wdog_reboot_notifier = { |
|
.notifier_call = wdog_reboot_handler, |
|
.next = NULL, |
|
.priority = 0 |
|
}; |
|
|
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static void ipmi_new_smi(int if_num, struct device *device) |
|
{ |
|
ipmi_register_watchdog(if_num); |
|
} |
|
|
|
static void ipmi_smi_gone(int if_num) |
|
{ |
|
ipmi_unregister_watchdog(if_num); |
|
} |
|
|
|
static struct ipmi_smi_watcher smi_watcher = { |
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.owner = THIS_MODULE, |
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.new_smi = ipmi_new_smi, |
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.smi_gone = ipmi_smi_gone |
|
}; |
|
|
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static int action_op(const char *inval, char *outval) |
|
{ |
|
if (outval) |
|
strcpy(outval, action); |
|
|
|
if (!inval) |
|
return 0; |
|
|
|
if (strcmp(inval, "reset") == 0) |
|
action_val = WDOG_TIMEOUT_RESET; |
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else if (strcmp(inval, "none") == 0) |
|
action_val = WDOG_TIMEOUT_NONE; |
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else if (strcmp(inval, "power_cycle") == 0) |
|
action_val = WDOG_TIMEOUT_POWER_CYCLE; |
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else if (strcmp(inval, "power_off") == 0) |
|
action_val = WDOG_TIMEOUT_POWER_DOWN; |
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else |
|
return -EINVAL; |
|
strcpy(action, inval); |
|
return 0; |
|
} |
|
|
|
static int preaction_op(const char *inval, char *outval) |
|
{ |
|
if (outval) |
|
strcpy(outval, preaction); |
|
|
|
if (!inval) |
|
return 0; |
|
|
|
if (strcmp(inval, "pre_none") == 0) |
|
preaction_val = WDOG_PRETIMEOUT_NONE; |
|
else if (strcmp(inval, "pre_smi") == 0) |
|
preaction_val = WDOG_PRETIMEOUT_SMI; |
|
#ifdef HAVE_DIE_NMI |
|
else if (strcmp(inval, "pre_nmi") == 0) |
|
preaction_val = WDOG_PRETIMEOUT_NMI; |
|
#endif |
|
else if (strcmp(inval, "pre_int") == 0) |
|
preaction_val = WDOG_PRETIMEOUT_MSG_INT; |
|
else |
|
return -EINVAL; |
|
strcpy(preaction, inval); |
|
return 0; |
|
} |
|
|
|
static int preop_op(const char *inval, char *outval) |
|
{ |
|
if (outval) |
|
strcpy(outval, preop); |
|
|
|
if (!inval) |
|
return 0; |
|
|
|
if (strcmp(inval, "preop_none") == 0) |
|
preop_val = WDOG_PREOP_NONE; |
|
else if (strcmp(inval, "preop_panic") == 0) |
|
preop_val = WDOG_PREOP_PANIC; |
|
else if (strcmp(inval, "preop_give_data") == 0) |
|
preop_val = WDOG_PREOP_GIVE_DATA; |
|
else |
|
return -EINVAL; |
|
strcpy(preop, inval); |
|
return 0; |
|
} |
|
|
|
static void check_parms(void) |
|
{ |
|
#ifdef HAVE_DIE_NMI |
|
int do_nmi = 0; |
|
int rv; |
|
|
|
if (preaction_val == WDOG_PRETIMEOUT_NMI) { |
|
do_nmi = 1; |
|
if (preop_val == WDOG_PREOP_GIVE_DATA) { |
|
pr_warn("Pretimeout op is to give data but NMI pretimeout is enabled, setting pretimeout op to none\n"); |
|
preop_op("preop_none", NULL); |
|
do_nmi = 0; |
|
} |
|
} |
|
if (do_nmi && !nmi_handler_registered) { |
|
rv = register_nmi_handler(NMI_UNKNOWN, ipmi_nmi, 0, |
|
"ipmi"); |
|
if (rv) { |
|
pr_warn("Can't register nmi handler\n"); |
|
return; |
|
} else |
|
nmi_handler_registered = 1; |
|
} else if (!do_nmi && nmi_handler_registered) { |
|
unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
|
nmi_handler_registered = 0; |
|
} |
|
#endif |
|
} |
|
|
|
static int __init ipmi_wdog_init(void) |
|
{ |
|
int rv; |
|
|
|
if (action_op(action, NULL)) { |
|
action_op("reset", NULL); |
|
pr_info("Unknown action '%s', defaulting to reset\n", action); |
|
} |
|
|
|
if (preaction_op(preaction, NULL)) { |
|
preaction_op("pre_none", NULL); |
|
pr_info("Unknown preaction '%s', defaulting to none\n", |
|
preaction); |
|
} |
|
|
|
if (preop_op(preop, NULL)) { |
|
preop_op("preop_none", NULL); |
|
pr_info("Unknown preop '%s', defaulting to none\n", preop); |
|
} |
|
|
|
check_parms(); |
|
|
|
register_reboot_notifier(&wdog_reboot_notifier); |
|
|
|
rv = ipmi_smi_watcher_register(&smi_watcher); |
|
if (rv) { |
|
#ifdef HAVE_DIE_NMI |
|
if (nmi_handler_registered) |
|
unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
|
#endif |
|
unregister_reboot_notifier(&wdog_reboot_notifier); |
|
pr_warn("can't register smi watcher\n"); |
|
return rv; |
|
} |
|
|
|
pr_info("driver initialized\n"); |
|
|
|
return 0; |
|
} |
|
|
|
static void __exit ipmi_wdog_exit(void) |
|
{ |
|
ipmi_smi_watcher_unregister(&smi_watcher); |
|
ipmi_unregister_watchdog(watchdog_ifnum); |
|
|
|
#ifdef HAVE_DIE_NMI |
|
if (nmi_handler_registered) |
|
unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
|
#endif |
|
|
|
unregister_reboot_notifier(&wdog_reboot_notifier); |
|
} |
|
module_exit(ipmi_wdog_exit); |
|
module_init(ipmi_wdog_init); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Corey Minyard <[email protected]>"); |
|
MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface.");
|
|
|