1323 строки
33 KiB
C
1323 строки
33 KiB
C
/*
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* ipmi_watchdog.c
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*
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* A watchdog timer based upon the IPMI interface.
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*
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* Author: MontaVista Software, Inc.
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* Corey Minyard <minyard@mvista.com>
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* source@mvista.com
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*
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* Copyright 2002 MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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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/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 <asm/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 <asm/atomic.h>
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#ifdef CONFIG_X86
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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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#include <asm/kdebug.h>
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#define HAVE_DIE_NMI
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#endif
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#define PFX "IPMI Watchdog: "
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/*
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* The IPMI command/response information for the watchdog timer.
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*/
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/* values for byte 1 of the set command, byte 2 of the get response. */
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#define WDOG_DONT_LOG (1 << 7)
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#define WDOG_DONT_STOP_ON_SET (1 << 6)
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#define WDOG_SET_TIMER_USE(byte, use) \
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byte = ((byte) & 0xf8) | ((use) & 0x7)
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#define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7)
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#define WDOG_TIMER_USE_BIOS_FRB2 1
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#define WDOG_TIMER_USE_BIOS_POST 2
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#define WDOG_TIMER_USE_OS_LOAD 3
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#define WDOG_TIMER_USE_SMS_OS 4
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#define WDOG_TIMER_USE_OEM 5
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/* values for byte 2 of the set command, byte 3 of the get response. */
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#define WDOG_SET_PRETIMEOUT_ACT(byte, use) \
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byte = ((byte) & 0x8f) | (((use) & 0x7) << 4)
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#define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7)
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#define WDOG_PRETIMEOUT_NONE 0
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#define WDOG_PRETIMEOUT_SMI 1
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#define WDOG_PRETIMEOUT_NMI 2
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#define WDOG_PRETIMEOUT_MSG_INT 3
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/* Operations that can be performed on a pretimout. */
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#define WDOG_PREOP_NONE 0
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#define WDOG_PREOP_PANIC 1
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#define WDOG_PREOP_GIVE_DATA 2 /* Cause data to be available to
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read. Doesn't work in NMI
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mode. */
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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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/* 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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/* 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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/* 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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#define WDOG_SET_TIMEOUT(byte1, byte2, val) \
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(byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8)
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#define WDOG_GET_TIMEOUT(byte1, byte2) \
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(((byte1) | ((byte2) << 8)) / 10)
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#define IPMI_WDOG_RESET_TIMER 0x22
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#define IPMI_WDOG_SET_TIMER 0x24
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#define IPMI_WDOG_GET_TIMER 0x25
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/* These are here until the real ones get into the watchdog.h interface. */
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#ifndef WDIOC_GETTIMEOUT
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#define WDIOC_GETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 20, int)
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#endif
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#ifndef WDIOC_SET_PRETIMEOUT
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#define WDIOC_SET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 21, int)
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#endif
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#ifndef WDIOC_GET_PRETIMEOUT
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#define WDIOC_GET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 22, int)
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#endif
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static int nowayout = WATCHDOG_NOWAYOUT;
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static ipmi_user_t watchdog_user;
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static int watchdog_ifnum;
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/* Default the timeout to 10 seconds. */
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static int timeout = 10;
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/* The pre-timeout is disabled by default. */
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static int pretimeout;
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/* Default action is to reset the board on a timeout. */
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static unsigned char action_val = WDOG_TIMEOUT_RESET;
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static char action[16] = "reset";
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static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE;
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static char preaction[16] = "pre_none";
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static unsigned char preop_val = WDOG_PREOP_NONE;
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static char preop[16] = "preop_none";
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static DEFINE_SPINLOCK(ipmi_read_lock);
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static char data_to_read;
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static DECLARE_WAIT_QUEUE_HEAD(read_q);
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static struct fasync_struct *fasync_q;
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static char pretimeout_since_last_heartbeat;
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static char expect_close;
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static int ifnum_to_use = -1;
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/* Parameters to ipmi_set_timeout */
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#define IPMI_SET_TIMEOUT_NO_HB 0
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#define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1
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#define IPMI_SET_TIMEOUT_FORCE_HB 2
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static int ipmi_set_timeout(int do_heartbeat);
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static void ipmi_register_watchdog(int ipmi_intf);
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static void ipmi_unregister_watchdog(int ipmi_intf);
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/* If true, the driver will start running as soon as it is configured
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and ready. */
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static int start_now;
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static int set_param_int(const char *val, struct kernel_param *kp)
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{
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char *endp;
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int l;
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int rv = 0;
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if (!val)
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return -EINVAL;
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l = simple_strtoul(val, &endp, 0);
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if (endp == val)
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return -EINVAL;
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*((int *)kp->arg) = l;
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if (watchdog_user)
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rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
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return rv;
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}
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static int get_param_int(char *buffer, struct kernel_param *kp)
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{
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return sprintf(buffer, "%i", *((int *)kp->arg));
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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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static int set_param_str(const char *val, 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, 16);
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valcp[15] = '\0';
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s = strstrip(valcp);
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rv = fn(s, NULL);
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if (rv)
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goto out;
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check_parms();
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if (watchdog_user)
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rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
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out:
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return rv;
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}
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static int get_param_str(char *buffer, 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;
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rv = fn(NULL, buffer);
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if (rv)
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return rv;
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return strlen(buffer);
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}
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static int set_param_wdog_ifnum(const char *val, 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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module_param_call(ifnum_to_use, set_param_wdog_ifnum, get_param_int,
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&ifnum_to_use, 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_call(timeout, set_param_int, get_param_int, &timeout, 0644);
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MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
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module_param_call(pretimeout, set_param_int, get_param_int, &pretimeout, 0644);
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MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");
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module_param_call(action, set_param_str, get_param_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_call(preaction, set_param_str, get_param_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_call(preop, set_param_str, get_param_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, int, 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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/* If shutting down via IPMI, we ignore the heartbeat. */
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static int ipmi_ignore_heartbeat;
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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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/* 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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static int ipmi_start_timer_on_heartbeat;
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/* IPMI version of the BMC. */
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static unsigned char ipmi_version_major;
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static unsigned char ipmi_version_minor;
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/* If a pretimeout occurs, this is used to allow only one panic to happen. */
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static atomic_t preop_panic_excl = ATOMIC_INIT(-1);
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#ifdef HAVE_DIE_NMI
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static int testing_nmi;
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static int nmi_handler_registered;
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#endif
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static int ipmi_heartbeat(void);
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/* We use a mutex to make sure that only one thing can send a set
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timeout at one time, because we only have one copy of the data.
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The mutex is claimed when the set_timeout is sent and freed
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when both messages are free. */
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static atomic_t set_timeout_tofree = ATOMIC_INIT(0);
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static DEFINE_MUTEX(set_timeout_lock);
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static DECLARE_COMPLETION(set_timeout_wait);
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static void set_timeout_free_smi(struct ipmi_smi_msg *msg)
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{
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if (atomic_dec_and_test(&set_timeout_tofree))
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complete(&set_timeout_wait);
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}
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static void set_timeout_free_recv(struct ipmi_recv_msg *msg)
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{
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if (atomic_dec_and_test(&set_timeout_tofree))
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complete(&set_timeout_wait);
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}
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static struct ipmi_smi_msg set_timeout_smi_msg =
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{
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.done = set_timeout_free_smi
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};
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static struct ipmi_recv_msg set_timeout_recv_msg =
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{
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.done = set_timeout_free_recv
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};
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static int i_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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/* These can be cleared as we are setting the timeout. */
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pretimeout_since_last_heartbeat = 0;
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data[0] = 0;
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WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
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if ((ipmi_version_major > 1)
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|| ((ipmi_version_major == 1) && (ipmi_version_minor >= 5)))
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{
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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 if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
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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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hbnow = 1;
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}
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data[1] = 0;
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WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state);
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if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) {
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WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val);
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data[2] = pretimeout;
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} else {
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WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE);
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data[2] = 0; /* No pretimeout. */
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}
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data[3] = 0;
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WDOG_SET_TIMEOUT(data[4], data[5], timeout);
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addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
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addr.channel = IPMI_BMC_CHANNEL;
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addr.lun = 0;
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msg.netfn = 0x06;
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msg.cmd = IPMI_WDOG_SET_TIMER;
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msg.data = data;
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msg.data_len = sizeof(data);
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rv = ipmi_request_supply_msgs(watchdog_user,
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(struct ipmi_addr *) &addr,
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0,
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&msg,
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NULL,
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smi_msg,
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recv_msg,
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1);
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if (rv) {
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printk(KERN_WARNING PFX "set timeout error: %d\n",
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rv);
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}
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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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/* We can only send one of these at a time. */
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mutex_lock(&set_timeout_lock);
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atomic_set(&set_timeout_tofree, 2);
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rv = i_ipmi_set_timeout(&set_timeout_smi_msg,
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&set_timeout_recv_msg,
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&send_heartbeat_now);
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if (rv) {
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mutex_unlock(&set_timeout_lock);
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goto out;
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}
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wait_for_completion(&set_timeout_wait);
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mutex_unlock(&set_timeout_lock);
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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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out:
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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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{
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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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{
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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;
|
|
int rv;
|
|
|
|
/* 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;
|
|
|
|
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,
|
|
&panic_halt_heartbeat_smi_msg,
|
|
&panic_halt_heartbeat_recv_msg,
|
|
1);
|
|
if (!rv)
|
|
atomic_add(2, &panic_done_count);
|
|
}
|
|
|
|
static struct ipmi_smi_msg panic_halt_smi_msg =
|
|
{
|
|
.done = panic_smi_free
|
|
};
|
|
static struct ipmi_recv_msg panic_halt_recv_msg =
|
|
{
|
|
.done = panic_recv_free
|
|
};
|
|
|
|
/* Special call, doesn't claim any locks. This is only to be called
|
|
at panic or halt time, in run-to-completion mode, when the caller
|
|
is the only CPU and the only thing that will be going is these IPMI
|
|
calls. */
|
|
static void panic_halt_ipmi_set_timeout(void)
|
|
{
|
|
int send_heartbeat_now;
|
|
int rv;
|
|
|
|
/* Wait for the messages to be free. */
|
|
while (atomic_read(&panic_done_count) != 0)
|
|
ipmi_poll_interface(watchdog_user);
|
|
rv = i_ipmi_set_timeout(&panic_halt_smi_msg,
|
|
&panic_halt_recv_msg,
|
|
&send_heartbeat_now);
|
|
if (!rv) {
|
|
atomic_add(2, &panic_done_count);
|
|
if (send_heartbeat_now)
|
|
panic_halt_ipmi_heartbeat();
|
|
} else
|
|
printk(KERN_WARNING PFX
|
|
"Unable to extend the watchdog timeout.");
|
|
while (atomic_read(&panic_done_count) != 0)
|
|
ipmi_poll_interface(watchdog_user);
|
|
}
|
|
|
|
/* We use a semaphore to make sure that only one thing can send a
|
|
heartbeat at one time, because we only have one copy of the data.
|
|
The semaphore is claimed when the set_timeout is sent and freed
|
|
when both messages are free. */
|
|
static atomic_t heartbeat_tofree = ATOMIC_INIT(0);
|
|
static DEFINE_MUTEX(heartbeat_lock);
|
|
static DECLARE_COMPLETION(heartbeat_wait);
|
|
static void heartbeat_free_smi(struct ipmi_smi_msg *msg)
|
|
{
|
|
if (atomic_dec_and_test(&heartbeat_tofree))
|
|
complete(&heartbeat_wait);
|
|
}
|
|
static void heartbeat_free_recv(struct ipmi_recv_msg *msg)
|
|
{
|
|
if (atomic_dec_and_test(&heartbeat_tofree))
|
|
complete(&heartbeat_wait);
|
|
}
|
|
static struct ipmi_smi_msg heartbeat_smi_msg =
|
|
{
|
|
.done = heartbeat_free_smi
|
|
};
|
|
static struct ipmi_recv_msg heartbeat_recv_msg =
|
|
{
|
|
.done = heartbeat_free_recv
|
|
};
|
|
|
|
static int ipmi_heartbeat(void)
|
|
{
|
|
struct kernel_ipmi_msg msg;
|
|
int rv;
|
|
struct ipmi_system_interface_addr addr;
|
|
|
|
if (ipmi_ignore_heartbeat)
|
|
return 0;
|
|
|
|
if (ipmi_start_timer_on_heartbeat) {
|
|
ipmi_start_timer_on_heartbeat = 0;
|
|
ipmi_watchdog_state = action_val;
|
|
return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
|
|
} else if (pretimeout_since_last_heartbeat) {
|
|
/* 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. */
|
|
return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
|
|
}
|
|
|
|
mutex_lock(&heartbeat_lock);
|
|
|
|
atomic_set(&heartbeat_tofree, 2);
|
|
|
|
/* Don't reset the timer if we have the timer turned off, that
|
|
re-enables the watchdog. */
|
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) {
|
|
mutex_unlock(&heartbeat_lock);
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
&heartbeat_smi_msg,
|
|
&heartbeat_recv_msg,
|
|
1);
|
|
if (rv) {
|
|
mutex_unlock(&heartbeat_lock);
|
|
printk(KERN_WARNING PFX "heartbeat failure: %d\n",
|
|
rv);
|
|
return rv;
|
|
}
|
|
|
|
/* Wait for the heartbeat to be sent. */
|
|
wait_for_completion(&heartbeat_wait);
|
|
|
|
if (heartbeat_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;
|
|
}
|
|
|
|
mutex_unlock(&heartbeat_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
static struct watchdog_info ident =
|
|
{
|
|
.options = 0, /* WDIOF_SETTIMEOUT, */
|
|
.firmware_version = 1,
|
|
.identity = "IPMI"
|
|
};
|
|
|
|
static int ipmi_ioctl(struct inode *inode, 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_SET_PRETIMEOUT:
|
|
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_GET_PRETIMEOUT:
|
|
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 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 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ipmi_read(struct file *file,
|
|
char __user *buf,
|
|
size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
int rv = 0;
|
|
wait_queue_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(&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(&ipmi_read_lock);
|
|
schedule();
|
|
spin_lock(&ipmi_read_lock);
|
|
}
|
|
remove_wait_queue(&read_q, &wait);
|
|
|
|
if (signal_pending(current)) {
|
|
rv = -ERESTARTSYS;
|
|
goto out;
|
|
}
|
|
}
|
|
data_to_read = 0;
|
|
|
|
out:
|
|
spin_unlock(&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 nonseekable_open(ino, filep);
|
|
|
|
default:
|
|
return (-ENODEV);
|
|
}
|
|
}
|
|
|
|
static unsigned int ipmi_poll(struct file *file, poll_table *wait)
|
|
{
|
|
unsigned int mask = 0;
|
|
|
|
poll_wait(file, &read_q, wait);
|
|
|
|
spin_lock(&ipmi_read_lock);
|
|
if (data_to_read)
|
|
mask |= (POLLIN | POLLRDNORM);
|
|
spin_unlock(&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) {
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
|
|
ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB);
|
|
} else {
|
|
printk(KERN_CRIT PFX
|
|
"Unexpected close, not stopping watchdog!\n");
|
|
ipmi_heartbeat();
|
|
}
|
|
clear_bit(0, &ipmi_wdog_open);
|
|
}
|
|
|
|
ipmi_fasync (-1, filep, 0);
|
|
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,
|
|
.ioctl = ipmi_ioctl,
|
|
.open = ipmi_open,
|
|
.release = ipmi_close,
|
|
.fasync = ipmi_fasync,
|
|
};
|
|
|
|
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.data[0] != 0) {
|
|
printk(KERN_ERR PFX "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) {
|
|
spin_lock(&ipmi_read_lock);
|
|
data_to_read = 1;
|
|
wake_up_interruptible(&read_q);
|
|
kill_fasync(&fasync_q, SIGIO, POLL_IN);
|
|
|
|
spin_unlock(&ipmi_read_lock);
|
|
}
|
|
}
|
|
|
|
/* On some machines, the heartbeat will give
|
|
an error and not work unless we re-enable
|
|
the timer. So do so. */
|
|
pretimeout_since_last_heartbeat = 1;
|
|
}
|
|
|
|
static struct ipmi_user_hndl ipmi_hndlrs =
|
|
{
|
|
.ipmi_recv_hndl = ipmi_wdog_msg_handler,
|
|
.ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_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) {
|
|
printk(KERN_CRIT PFX "Unable to register with ipmi\n");
|
|
goto out;
|
|
}
|
|
|
|
ipmi_get_version(watchdog_user,
|
|
&ipmi_version_major,
|
|
&ipmi_version_minor);
|
|
|
|
rv = misc_register(&ipmi_wdog_miscdev);
|
|
if (rv < 0) {
|
|
ipmi_destroy_user(watchdog_user);
|
|
watchdog_user = NULL;
|
|
printk(KERN_CRIT PFX "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) {
|
|
printk(KERN_WARNING PFX "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) {
|
|
printk(KERN_WARNING PFX "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);
|
|
printk(KERN_INFO PFX "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;
|
|
|
|
if (!watchdog_user)
|
|
goto out;
|
|
|
|
if (watchdog_ifnum != ipmi_intf)
|
|
goto out;
|
|
|
|
/* Make sure no one can call us any more. */
|
|
misc_deregister(&ipmi_wdog_miscdev);
|
|
|
|
/* 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(&set_timeout_tofree))
|
|
schedule_timeout_uninterruptible(1);
|
|
|
|
/* Disconnect from IPMI. */
|
|
rv = ipmi_destroy_user(watchdog_user);
|
|
if (rv) {
|
|
printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n",
|
|
rv);
|
|
}
|
|
watchdog_user = NULL;
|
|
|
|
out:
|
|
return;
|
|
}
|
|
|
|
#ifdef HAVE_DIE_NMI
|
|
static int
|
|
ipmi_nmi(struct notifier_block *self, unsigned long val, void *data)
|
|
{
|
|
struct die_args *args = data;
|
|
|
|
if (val != DIE_NMI)
|
|
return NOTIFY_OK;
|
|
|
|
/* Hack, if it's a memory or I/O error, ignore it. */
|
|
if (args->err & 0xc0)
|
|
return NOTIFY_OK;
|
|
|
|
/*
|
|
* 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 NOTIFY_STOP;
|
|
}
|
|
|
|
/* If we are not expecting a timeout, ignore it. */
|
|
if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
|
|
return NOTIFY_OK;
|
|
|
|
if (preaction_val != WDOG_PRETIMEOUT_NMI)
|
|
return NOTIFY_OK;
|
|
|
|
/* 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. */
|
|
pretimeout_since_last_heartbeat = 1;
|
|
if (atomic_inc_and_test(&preop_panic_excl))
|
|
panic(PFX "pre-timeout");
|
|
}
|
|
|
|
return NOTIFY_STOP;
|
|
}
|
|
|
|
static struct notifier_block ipmi_nmi_handler = {
|
|
.notifier_call = ipmi_nmi
|
|
};
|
|
#endif
|
|
|
|
static int wdog_reboot_handler(struct notifier_block *this,
|
|
unsigned long code,
|
|
void *unused)
|
|
{
|
|
static int reboot_event_handled = 0;
|
|
|
|
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;
|
|
panic_halt_ipmi_set_timeout();
|
|
} else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) {
|
|
/* Set a long timer to let the reboot happens, but
|
|
reboot if it hangs, but only if the watchdog
|
|
timer was already running. */
|
|
timeout = 120;
|
|
pretimeout = 0;
|
|
ipmi_watchdog_state = WDOG_TIMEOUT_RESET;
|
|
panic_halt_ipmi_set_timeout();
|
|
}
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block wdog_reboot_notifier = {
|
|
.notifier_call = wdog_reboot_handler,
|
|
.next = NULL,
|
|
.priority = 0
|
|
};
|
|
|
|
static int wdog_panic_handler(struct notifier_block *this,
|
|
unsigned long event,
|
|
void *unused)
|
|
{
|
|
static int panic_event_handled = 0;
|
|
|
|
/* 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 = 255;
|
|
pretimeout = 0;
|
|
panic_halt_ipmi_set_timeout();
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block wdog_panic_notifier = {
|
|
.notifier_call = wdog_panic_handler,
|
|
.next = NULL,
|
|
.priority = 150 /* priority: INT_MAX >= x >= 0 */
|
|
};
|
|
|
|
|
|
static void ipmi_new_smi(int if_num, struct device *device)
|
|
{
|
|
ipmi_register_watchdog(if_num);
|
|
}
|
|
|
|
static void ipmi_smi_gone(int if_num)
|
|
{
|
|
ipmi_unregister_watchdog(if_num);
|
|
}
|
|
|
|
static struct ipmi_smi_watcher smi_watcher =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.new_smi = ipmi_new_smi,
|
|
.smi_gone = ipmi_smi_gone
|
|
};
|
|
|
|
static int action_op(const char *inval, char *outval)
|
|
{
|
|
if (outval)
|
|
strcpy(outval, action);
|
|
|
|
if (!inval)
|
|
return 0;
|
|
|
|
if (strcmp(inval, "reset") == 0)
|
|
action_val = WDOG_TIMEOUT_RESET;
|
|
else if (strcmp(inval, "none") == 0)
|
|
action_val = WDOG_TIMEOUT_NONE;
|
|
else if (strcmp(inval, "power_cycle") == 0)
|
|
action_val = WDOG_TIMEOUT_POWER_CYCLE;
|
|
else if (strcmp(inval, "power_off") == 0)
|
|
action_val = WDOG_TIMEOUT_POWER_DOWN;
|
|
else
|
|
return -EINVAL;
|
|
strcpy(action, inval);
|
|
return 0;
|
|
}
|
|
|
|
static int preaction_op(const char *inval, char *outval)
|
|
{
|
|
if (outval)
|
|
strcpy(outval, preaction);
|
|
|
|
if (!inval)
|
|
return 0;
|
|
|
|
if (strcmp(inval, "pre_none") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_NONE;
|
|
else if (strcmp(inval, "pre_smi") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_SMI;
|
|
#ifdef HAVE_DIE_NMI
|
|
else if (strcmp(inval, "pre_nmi") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_NMI;
|
|
#endif
|
|
else if (strcmp(inval, "pre_int") == 0)
|
|
preaction_val = WDOG_PRETIMEOUT_MSG_INT;
|
|
else
|
|
return -EINVAL;
|
|
strcpy(preaction, inval);
|
|
return 0;
|
|
}
|
|
|
|
static int preop_op(const char *inval, char *outval)
|
|
{
|
|
if (outval)
|
|
strcpy(outval, preop);
|
|
|
|
if (!inval)
|
|
return 0;
|
|
|
|
if (strcmp(inval, "preop_none") == 0)
|
|
preop_val = WDOG_PREOP_NONE;
|
|
else if (strcmp(inval, "preop_panic") == 0)
|
|
preop_val = WDOG_PREOP_PANIC;
|
|
else if (strcmp(inval, "preop_give_data") == 0)
|
|
preop_val = WDOG_PREOP_GIVE_DATA;
|
|
else
|
|
return -EINVAL;
|
|
strcpy(preop, inval);
|
|
return 0;
|
|
}
|
|
|
|
static void check_parms(void)
|
|
{
|
|
#ifdef HAVE_DIE_NMI
|
|
int do_nmi = 0;
|
|
int rv;
|
|
|
|
if (preaction_val == WDOG_PRETIMEOUT_NMI) {
|
|
do_nmi = 1;
|
|
if (preop_val == WDOG_PREOP_GIVE_DATA) {
|
|
printk(KERN_WARNING PFX "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_die_notifier(&ipmi_nmi_handler);
|
|
if (rv) {
|
|
printk(KERN_WARNING PFX
|
|
"Can't register nmi handler\n");
|
|
return;
|
|
} else
|
|
nmi_handler_registered = 1;
|
|
} else if (!do_nmi && nmi_handler_registered) {
|
|
unregister_die_notifier(&ipmi_nmi_handler);
|
|
nmi_handler_registered = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int __init ipmi_wdog_init(void)
|
|
{
|
|
int rv;
|
|
|
|
if (action_op(action, NULL)) {
|
|
action_op("reset", NULL);
|
|
printk(KERN_INFO PFX "Unknown action '%s', defaulting to"
|
|
" reset\n", action);
|
|
}
|
|
|
|
if (preaction_op(preaction, NULL)) {
|
|
preaction_op("pre_none", NULL);
|
|
printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to"
|
|
" none\n", preaction);
|
|
}
|
|
|
|
if (preop_op(preop, NULL)) {
|
|
preop_op("preop_none", NULL);
|
|
printk(KERN_INFO PFX "Unknown preop '%s', defaulting to"
|
|
" none\n", preop);
|
|
}
|
|
|
|
check_parms();
|
|
|
|
register_reboot_notifier(&wdog_reboot_notifier);
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
|
&wdog_panic_notifier);
|
|
|
|
rv = ipmi_smi_watcher_register(&smi_watcher);
|
|
if (rv) {
|
|
#ifdef HAVE_DIE_NMI
|
|
if (nmi_handler_registered)
|
|
unregister_die_notifier(&ipmi_nmi_handler);
|
|
#endif
|
|
atomic_notifier_chain_unregister(&panic_notifier_list,
|
|
&wdog_panic_notifier);
|
|
unregister_reboot_notifier(&wdog_reboot_notifier);
|
|
printk(KERN_WARNING PFX "can't register smi watcher\n");
|
|
return rv;
|
|
}
|
|
|
|
printk(KERN_INFO PFX "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_die_notifier(&ipmi_nmi_handler);
|
|
#endif
|
|
|
|
atomic_notifier_chain_unregister(&panic_notifier_list,
|
|
&wdog_panic_notifier);
|
|
unregister_reboot_notifier(&wdog_reboot_notifier);
|
|
}
|
|
module_exit(ipmi_wdog_exit);
|
|
module_init(ipmi_wdog_init);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>");
|
|
MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface.");
|