diff options
Diffstat (limited to 'drivers/char/ipmi/ipmi_watchdog.c')
| -rw-r--r-- | drivers/char/ipmi/ipmi_watchdog.c | 1068 |
1 files changed, 1068 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c new file mode 100644 index 0000000..fd70938 --- /dev/null +++ b/drivers/char/ipmi/ipmi_watchdog.c @@ -0,0 +1,1068 @@ +/* + * ipmi_watchdog.c + * + * A watchdog timer based upon the IPMI interface. + * + * Author: MontaVista Software, Inc. + * Corey Minyard <minyard@mvista.com> + * source@mvista.com + * + * Copyright 2002 MontaVista Software Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE + * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/ipmi.h> +#include <linux/ipmi_smi.h> +#include <linux/watchdog.h> +#include <linux/miscdevice.h> +#include <linux/init.h> +#include <linux/rwsem.h> +#include <linux/errno.h> +#include <asm/uaccess.h> +#include <linux/notifier.h> +#include <linux/nmi.h> +#include <linux/reboot.h> +#include <linux/wait.h> +#include <linux/poll.h> +#ifdef CONFIG_X86_LOCAL_APIC +#include <asm/apic.h> +#endif + +#define PFX "IPMI Watchdog: " + +#define IPMI_WATCHDOG_VERSION "v33" + +/* + * The IPMI command/response information for the watchdog timer. + */ + +/* values for byte 1 of the set command, byte 2 of the get response. */ +#define WDOG_DONT_LOG (1 << 7) +#define WDOG_DONT_STOP_ON_SET (1 << 6) +#define WDOG_SET_TIMER_USE(byte, use) \ + byte = ((byte) & 0xf8) | ((use) & 0x7) +#define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7) +#define WDOG_TIMER_USE_BIOS_FRB2 1 +#define WDOG_TIMER_USE_BIOS_POST 2 +#define WDOG_TIMER_USE_OS_LOAD 3 +#define WDOG_TIMER_USE_SMS_OS 4 +#define WDOG_TIMER_USE_OEM 5 + +/* values for byte 2 of the set command, byte 3 of the get response. */ +#define WDOG_SET_PRETIMEOUT_ACT(byte, use) \ + byte = ((byte) & 0x8f) | (((use) & 0x7) << 4) +#define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7) +#define WDOG_PRETIMEOUT_NONE 0 +#define WDOG_PRETIMEOUT_SMI 1 +#define WDOG_PRETIMEOUT_NMI 2 +#define WDOG_PRETIMEOUT_MSG_INT 3 + +/* Operations that can be performed on a pretimout. */ +#define WDOG_PREOP_NONE 0 +#define WDOG_PREOP_PANIC 1 +#define WDOG_PREOP_GIVE_DATA 2 /* Cause data to be available to + read. Doesn't work in NMI + mode. */ + +/* Actions to perform on a full timeout. */ +#define WDOG_SET_TIMEOUT_ACT(byte, use) \ + byte = ((byte) & 0xf8) | ((use) & 0x7) +#define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7) +#define WDOG_TIMEOUT_NONE 0 +#define WDOG_TIMEOUT_RESET 1 +#define WDOG_TIMEOUT_POWER_DOWN 2 +#define WDOG_TIMEOUT_POWER_CYCLE 3 + +/* Byte 3 of the get command, byte 4 of the get response is the + pre-timeout in seconds. */ + +/* Bits for setting byte 4 of the set command, byte 5 of the get response. */ +#define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1) +#define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2) +#define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3) +#define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4) +#define WDOG_EXPIRE_CLEAR_OEM (1 << 5) + +/* Setting/getting the watchdog timer value. This is for bytes 5 and + 6 (the timeout time) of the set command, and bytes 6 and 7 (the + timeout time) and 8 and 9 (the current countdown value) of the + response. The timeout value is given in seconds (in the command it + is 100ms intervals). */ +#define WDOG_SET_TIMEOUT(byte1, byte2, val) \ + (byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8) +#define WDOG_GET_TIMEOUT(byte1, byte2) \ + (((byte1) | ((byte2) << 8)) / 10) + +#define IPMI_WDOG_RESET_TIMER 0x22 +#define IPMI_WDOG_SET_TIMER 0x24 +#define IPMI_WDOG_GET_TIMER 0x25 + +/* These are here until the real ones get into the watchdog.h interface. */ +#ifndef WDIOC_GETTIMEOUT +#define WDIOC_GETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 20, int) +#endif +#ifndef WDIOC_SET_PRETIMEOUT +#define WDIOC_SET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 21, int) +#endif +#ifndef WDIOC_GET_PRETIMEOUT +#define WDIOC_GET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 22, int) +#endif + +#ifdef CONFIG_WATCHDOG_NOWAYOUT +static int nowayout = 1; +#else +static int nowayout; +#endif + +static ipmi_user_t watchdog_user = NULL; + +/* Default the timeout to 10 seconds. */ +static int timeout = 10; + +/* The pre-timeout is disabled by default. */ +static int pretimeout = 0; + +/* Default action is to reset the board on a timeout. */ +static unsigned char action_val = WDOG_TIMEOUT_RESET; + +static char action[16] = "reset"; + +static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE; + +static char preaction[16] = "pre_none"; + +static unsigned char preop_val = WDOG_PREOP_NONE; + +static char preop[16] = "preop_none"; +static DEFINE_SPINLOCK(ipmi_read_lock); +static char data_to_read = 0; +static DECLARE_WAIT_QUEUE_HEAD(read_q); +static struct fasync_struct *fasync_q = NULL; +static char pretimeout_since_last_heartbeat = 0; +static char expect_close; + +/* If true, the driver will start running as soon as it is configured + and ready. */ +static int start_now = 0; + +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, "Timeout value in seconds."); +module_param(pretimeout, int, 0); +MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); +module_param_string(action, action, sizeof(action), 0); +MODULE_PARM_DESC(action, "Timeout action. One of: " + "reset, none, power_cycle, power_off."); +module_param_string(preaction, preaction, sizeof(preaction), 0); +MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " + "pre_none, pre_smi, pre_nmi, pre_int."); +module_param_string(preop, preop, sizeof(preop), 0); +MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " + "preop_none, preop_panic, preop_give_data."); +module_param(start_now, int, 0); +MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" + "soon as the driver is loaded."); +module_param(nowayout, int, 0); +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); + +/* Default state of the timer. */ +static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; + +/* If shutting down via IPMI, we ignore the heartbeat. */ +static int ipmi_ignore_heartbeat = 0; + +/* Is someone using the watchdog? Only one user is allowed. */ +static unsigned long ipmi_wdog_open = 0; + +/* If set to 1, the heartbeat command will set the state to reset and + start the timer. The timer doesn't normally run when the driver is + first opened until the heartbeat is set the first time, this + variable is used to accomplish this. */ +static int ipmi_start_timer_on_heartbeat = 0; + +/* IPMI version of the BMC. */ +static unsigned char ipmi_version_major; +static unsigned char ipmi_version_minor; + + +static int ipmi_heartbeat(void); +static void panic_halt_ipmi_heartbeat(void); + + +/* We use a semaphore to make sure that only one thing can send a set + timeout 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 set_timeout_tofree = ATOMIC_INIT(0); +static DECLARE_MUTEX(set_timeout_lock); +static void set_timeout_free_smi(struct ipmi_smi_msg *msg) +{ + if (atomic_dec_and_test(&set_timeout_tofree)) + up(&set_timeout_lock); +} +static void set_timeout_free_recv(struct ipmi_recv_msg *msg) +{ + if (atomic_dec_and_test(&set_timeout_tofree)) + up(&set_timeout_lock); +} +static struct ipmi_smi_msg set_timeout_smi_msg = +{ + .done = set_timeout_free_smi +}; +static struct ipmi_recv_msg set_timeout_recv_msg = +{ + .done = set_timeout_free_recv +}; + +static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, + struct ipmi_recv_msg *recv_msg, + int *send_heartbeat_now) +{ + struct kernel_ipmi_msg msg; + unsigned char data[6]; + int rv; + struct ipmi_system_interface_addr addr; + int hbnow = 0; + + + data[0] = 0; + WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); + + if ((ipmi_version_major > 1) + || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) + { + /* This is an IPMI 1.5-only feature. */ + data[0] |= WDOG_DONT_STOP_ON_SET; + } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { + /* In ipmi 1.0, setting the timer stops the watchdog, we + need to start it back up again. */ + hbnow = 1; + } + + data[1] = 0; + WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); + if (pretimeout > 0) { + WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); + data[2] = pretimeout; + } else { + WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); + data[2] = 0; /* No pretimeout. */ + } + data[3] = 0; + WDOG_SET_TIMEOUT(data[4], data[5], timeout); + + addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; + addr.channel = IPMI_BMC_CHANNEL; + addr.lun = 0; + + msg.netfn = 0x06; + msg.cmd = IPMI_WDOG_SET_TIMER; + msg.data = data; + msg.data_len = sizeof(data); + rv = ipmi_request_supply_msgs(watchdog_user, + (struct ipmi_addr *) &addr, + 0, + &msg, + NULL, + smi_msg, + recv_msg, + 1); + if (rv) { + printk(KERN_WARNING PFX "set timeout error: %d\n", + rv); + } + + if (send_heartbeat_now) + *send_heartbeat_now = hbnow; + + return rv; +} + +/* Parameters to ipmi_set_timeout */ +#define IPMI_SET_TIMEOUT_NO_HB 0 +#define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1 +#define IPMI_SET_TIMEOUT_FORCE_HB 2 + +static int ipmi_set_timeout(int do_heartbeat) +{ + int send_heartbeat_now; + int rv; + + + /* We can only send one of these at a time. */ + down(&set_timeout_lock); + + atomic_set(&set_timeout_tofree, 2); + + rv = i_ipmi_set_timeout(&set_timeout_smi_msg, + &set_timeout_recv_msg, + &send_heartbeat_now); + if (rv) { + up(&set_timeout_lock); + } else { + if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) + || ((send_heartbeat_now) + && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) + { + rv = ipmi_heartbeat(); + } + } + + return rv; +} + +static void dummy_smi_free(struct ipmi_smi_msg *msg) +{ +} +static void dummy_recv_free(struct ipmi_recv_msg *msg) +{ +} +static struct ipmi_smi_msg panic_halt_smi_msg = +{ + .done = dummy_smi_free +}; +static struct ipmi_recv_msg panic_halt_recv_msg = +{ + .done = dummy_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; + + rv = i_ipmi_set_timeout(&panic_halt_smi_msg, + &panic_halt_recv_msg, + &send_heartbeat_now); + if (!rv) { + if (send_heartbeat_now) + panic_halt_ipmi_heartbeat(); + } +} + +/* 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 DECLARE_MUTEX(heartbeat_lock); +static DECLARE_MUTEX_LOCKED(heartbeat_wait_lock); +static void heartbeat_free_smi(struct ipmi_smi_msg *msg) +{ + if (atomic_dec_and_test(&heartbeat_tofree)) + up(&heartbeat_wait_lock); +} +static void heartbeat_free_recv(struct ipmi_recv_msg *msg) +{ + if (atomic_dec_and_test(&heartbeat_tofree)) + up(&heartbeat_wait_lock); +} +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 struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = +{ + .done = dummy_smi_free +}; +static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = +{ + .done = dummy_recv_free +}; + +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. */ + pretimeout_since_last_heartbeat = 0; + return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); + } + + down(&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) { + up(&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) { + up(&heartbeat_lock); + printk(KERN_WARNING PFX "heartbeat failure: %d\n", + rv); + return rv; + } + + /* Wait for the heartbeat to be sent. */ + down(&heartbeat_wait_lock); + + 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; + } + + up(&heartbeat_lock); + + return rv; +} + +static void panic_halt_ipmi_heartbeat(void) +{ + struct kernel_ipmi_msg msg; + struct ipmi_system_interface_addr addr; + + + /* 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; + ipmi_request_supply_msgs(watchdog_user, + (struct ipmi_addr *) &addr, + 0, + &msg, + NULL, + &panic_halt_heartbeat_smi_msg, + &panic_halt_heartbeat_recv_msg, + 1); +} + +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: + 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: + 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); + clear_bit(0, &ipmi_wdog_open); + } else { + printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); + ipmi_heartbeat(); + } + } + + ipmi_fasync (-1, filep, 0); + expect_close = 0; + + return 0; +} + +static 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 DECLARE_RWSEM(register_sem); + +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) + 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; + + down_write(®ister_sem); + if (watchdog_user) + goto out; + + 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"); + } + + out: + up_write(®ister_sem); + + 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"); + } +} + +#ifdef HAVE_NMI_HANDLER +static int +ipmi_nmi(void *dev_id, struct pt_regs *regs, int cpu, int handled) +{ + /* If no one else handled the NMI, we assume it was the IPMI + watchdog. */ + if ((!handled) && (preop_val == WDOG_PREOP_PANIC)) + panic(PFX "pre-timeout"); + + /* 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; + + return NOTIFY_DONE; +} + +static struct nmi_handler ipmi_nmi_handler = +{ + .link = LIST_HEAD_INIT(ipmi_nmi_handler.link), + .dev_name = "ipmi_watchdog", + .dev_id = NULL, + .handler = ipmi_nmi, + .priority = 0, /* Call us last. */ +}; +#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_DOWN || code == SYS_HALT) { + /* Disable the WDT if we are shutting down. */ + ipmi_watchdog_state = WDOG_TIMEOUT_NONE; + panic_halt_ipmi_set_timeout(); + } else { + /* Set a long timer to let the reboot happens, but + reboot if it hangs. */ + 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 that the thing + reboots, even if it hangs during that panic. */ + if (watchdog_user && !panic_event_handled) { + /* Make sure the panic doesn't hang, and make sure we + do this only once. */ + panic_event_handled = 1; + + timeout = 255; + pretimeout = 0; + ipmi_watchdog_state = WDOG_TIMEOUT_RESET; + 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) +{ + ipmi_register_watchdog(if_num); +} + +static void ipmi_smi_gone(int if_num) +{ + /* This can never be called, because once the watchdog is + registered, the interface can't go away until the watchdog + is unregistered. */ +} + +static struct ipmi_smi_watcher smi_watcher = +{ + .owner = THIS_MODULE, + .new_smi = ipmi_new_smi, + .smi_gone = ipmi_smi_gone +}; + +static int __init ipmi_wdog_init(void) +{ + int rv; + + printk(KERN_INFO PFX "driver version " + IPMI_WATCHDOG_VERSION "\n"); + + if (strcmp(action, "reset") == 0) { + action_val = WDOG_TIMEOUT_RESET; + } else if (strcmp(action, "none") == 0) { + action_val = WDOG_TIMEOUT_NONE; + } else if (strcmp(action, "power_cycle") == 0) { + action_val = WDOG_TIMEOUT_POWER_CYCLE; + } else if (strcmp(action, "power_off") == 0) { + action_val = WDOG_TIMEOUT_POWER_DOWN; + } else { + action_val = WDOG_TIMEOUT_RESET; + printk(KERN_INFO PFX "Unknown action '%s', defaulting to" + " reset\n", action); + } + + if (strcmp(preaction, "pre_none") == 0) { + preaction_val = WDOG_PRETIMEOUT_NONE; + } else if (strcmp(preaction, "pre_smi") == 0) { + preaction_val = WDOG_PRETIMEOUT_SMI; +#ifdef HAVE_NMI_HANDLER + } else if (strcmp(preaction, "pre_nmi") == 0) { + preaction_val = WDOG_PRETIMEOUT_NMI; +#endif + } else if (strcmp(preaction, "pre_int") == 0) { + preaction_val = WDOG_PRETIMEOUT_MSG_INT; + } else { + preaction_val = WDOG_PRETIMEOUT_NONE; + printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to" + " none\n", preaction); + } + + if (strcmp(preop, "preop_none") == 0) { + preop_val = WDOG_PREOP_NONE; + } else if (strcmp(preop, "preop_panic") == 0) { + preop_val = WDOG_PREOP_PANIC; + } else if (strcmp(preop, "preop_give_data") == 0) { + preop_val = WDOG_PREOP_GIVE_DATA; + } else { + preop_val = WDOG_PREOP_NONE; + printk(KERN_INFO PFX "Unknown preop '%s', defaulting to" + " none\n", preop); + } + +#ifdef HAVE_NMI_HANDLER + if (preaction_val == WDOG_PRETIMEOUT_NMI) { + 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_val = WDOG_PREOP_NONE; + } +#ifdef CONFIG_X86_LOCAL_APIC + if (nmi_watchdog == NMI_IO_APIC) { + printk(KERN_WARNING PFX "nmi_watchdog is set to IO APIC" + " mode (value is %d), that is incompatible" + " with using NMI in the IPMI watchdog." + " Disabling IPMI nmi pretimeout.\n", + nmi_watchdog); + preaction_val = WDOG_PRETIMEOUT_NONE; + } else { +#endif + rv = request_nmi(&ipmi_nmi_handler); + if (rv) { + printk(KERN_WARNING PFX "Can't register nmi handler\n"); + return rv; + } +#ifdef CONFIG_X86_LOCAL_APIC + } +#endif + } +#endif + + rv = ipmi_smi_watcher_register(&smi_watcher); + if (rv) { +#ifdef HAVE_NMI_HANDLER + if (preaction_val == WDOG_PRETIMEOUT_NMI) + release_nmi(&ipmi_nmi_handler); +#endif + printk(KERN_WARNING PFX "can't register smi watcher\n"); + return rv; + } + + register_reboot_notifier(&wdog_reboot_notifier); + notifier_chain_register(&panic_notifier_list, &wdog_panic_notifier); + + return 0; +} + +static __exit void ipmi_unregister_watchdog(void) +{ + int rv; + + down_write(®ister_sem); + +#ifdef HAVE_NMI_HANDLER + if (preaction_val == WDOG_PRETIMEOUT_NMI) + release_nmi(&ipmi_nmi_handler); +#endif + + notifier_chain_unregister(&panic_notifier_list, &wdog_panic_notifier); + unregister_reboot_notifier(&wdog_reboot_notifier); + + if (! watchdog_user) + 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)) { + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(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: + up_write(®ister_sem); +} + +static void __exit ipmi_wdog_exit(void) +{ + ipmi_smi_watcher_unregister(&smi_watcher); + ipmi_unregister_watchdog(); +} +module_exit(ipmi_wdog_exit); +module_init(ipmi_wdog_init); +MODULE_LICENSE("GPL"); |
