#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
+#include <linux/completion.h>
#include <linux/rwsem.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
#include <linux/reboot.h>
#include <linux/wait.h>
#include <linux/poll.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <asm/atomic.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.
*/
#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 int nowayout = WATCHDOG_NOWAYOUT;
static ipmi_user_t watchdog_user = NULL;
static char pretimeout_since_last_heartbeat = 0;
static char expect_close;
+static DECLARE_RWSEM(register_sem);
+
+/* 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);
+
/* 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);
+static int set_param_int(const char *val, struct kernel_param *kp)
+{
+ char *endp;
+ int l;
+ int rv = 0;
+
+ if (!val)
+ return -EINVAL;
+ l = simple_strtoul(val, &endp, 0);
+ if (endp == val)
+ return -EINVAL;
+
+ down_read(®ister_sem);
+ *((int *)kp->arg) = l;
+ if (watchdog_user)
+ rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
+ up_read(®ister_sem);
+
+ return rv;
+}
+
+static int get_param_int(char *buffer, struct kernel_param *kp)
+{
+ return sprintf(buffer, "%i", *((int *)kp->arg));
+}
+
+typedef int (*action_fn)(const char *intval, char *outval);
+
+static int action_op(const char *inval, char *outval);
+static int preaction_op(const char *inval, char *outval);
+static int preop_op(const char *inval, char *outval);
+static void check_parms(void);
+
+static int set_param_str(const char *val, struct kernel_param *kp)
+{
+ action_fn fn = (action_fn) kp->arg;
+ int rv = 0;
+ const char *end;
+ char valcp[16];
+ int len;
+
+ /* Truncate leading and trailing spaces. */
+ while (isspace(*val))
+ val++;
+ end = val + strlen(val) - 1;
+ while ((end >= val) && isspace(*end))
+ end--;
+ len = end - val + 1;
+ if (len > sizeof(valcp) - 1)
+ return -EINVAL;
+ memcpy(valcp, val, len);
+ valcp[len] = '\0';
+
+ down_read(®ister_sem);
+ rv = fn(valcp, NULL);
+ if (rv)
+ goto out_unlock;
+
+ check_parms();
+ if (watchdog_user)
+ rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
+
+ out_unlock:
+ up_read(®ister_sem);
+ return rv;
+}
+
+static int get_param_str(char *buffer, struct kernel_param *kp)
+{
+ action_fn fn = (action_fn) kp->arg;
+ int rv;
+
+ rv = fn(NULL, buffer);
+ if (rv)
+ return rv;
+ return strlen(buffer);
+}
+
+module_param_call(timeout, set_param_int, get_param_int, &timeout, 0644);
MODULE_PARM_DESC(timeout, "Timeout value in seconds.");
-module_param(pretimeout, int, 0);
+
+module_param_call(pretimeout, set_param_int, get_param_int, &pretimeout, 0644);
MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds.");
-module_param_string(action, action, sizeof(action), 0);
+
+module_param_call(action, set_param_str, get_param_str, action_op, 0644);
MODULE_PARM_DESC(action, "Timeout action. One of: "
"reset, none, power_cycle, power_off.");
-module_param_string(preaction, preaction, sizeof(preaction), 0);
+
+module_param_call(preaction, set_param_str, get_param_str, preaction_op, 0644);
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_param_call(preop, set_param_str, get_param_str, preop_op, 0644);
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_param(nowayout, int, 0644);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
/* Default state of the timer. */
static unsigned char ipmi_version_major;
static unsigned char ipmi_version_minor;
+/* If a pretimeout occurs, this is used to allow only one panic to happen. */
+static atomic_t preop_panic_excl = ATOMIC_INIT(-1);
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
+/* We use a mutex 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
+ The mutex 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 DEFINE_MUTEX(set_timeout_lock);
+static DECLARE_COMPLETION(set_timeout_wait);
static void set_timeout_free_smi(struct ipmi_smi_msg *msg)
{
if (atomic_dec_and_test(&set_timeout_tofree))
- up(&set_timeout_lock);
+ complete(&set_timeout_wait);
}
static void set_timeout_free_recv(struct ipmi_recv_msg *msg)
{
if (atomic_dec_and_test(&set_timeout_tofree))
- up(&set_timeout_lock);
+ complete(&set_timeout_wait);
}
static struct ipmi_smi_msg set_timeout_smi_msg =
{
data[1] = 0;
WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state);
- if (pretimeout > 0) {
+ if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) {
WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val);
data[2] = pretimeout;
} else {
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;
/* We can only send one of these at a time. */
- down(&set_timeout_lock);
+ mutex_lock(&set_timeout_lock);
atomic_set(&set_timeout_tofree, 2);
&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();
- }
+ mutex_unlock(&set_timeout_lock);
+ goto out;
+ }
+
+ wait_for_completion(&set_timeout_wait);
+
+ if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB)
+ || ((send_heartbeat_now)
+ && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY)))
+ {
+ rv = ipmi_heartbeat();
}
+ mutex_unlock(&set_timeout_lock);
+out:
return rv;
}
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 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))
- up(&heartbeat_wait_lock);
+ complete(&heartbeat_wait);
}
static void heartbeat_free_recv(struct ipmi_recv_msg *msg)
{
if (atomic_dec_and_test(&heartbeat_tofree))
- up(&heartbeat_wait_lock);
+ complete(&heartbeat_wait);
}
static struct ipmi_smi_msg heartbeat_smi_msg =
{
return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
}
- down(&heartbeat_lock);
+ 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) {
- up(&heartbeat_lock);
+ mutex_unlock(&heartbeat_lock);
return 0;
}
&heartbeat_recv_msg,
1);
if (rv) {
- up(&heartbeat_lock);
+ mutex_unlock(&heartbeat_lock);
printk(KERN_WARNING PFX "heartbeat failure: %d\n",
rv);
return rv;
}
/* Wait for the heartbeat to be sent. */
- down(&heartbeat_wait_lock);
+ wait_for_completion(&heartbeat_wait);
if (heartbeat_recv_msg.msg.data[0] != 0) {
/* Got an error in the heartbeat response. It was already
rv = -EINVAL;
}
- up(&heartbeat_lock);
+ mutex_unlock(&heartbeat_lock);
return rv;
}
1);
}
-static struct watchdog_info ident=
+static struct watchdog_info ident =
{
.options = 0, /* WDIOF_SETTIMEOUT, */
.firmware_version = 1,
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))
+ 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);
+ /* 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);
+ default:
+ return (-ENODEV);
}
}
static int ipmi_close(struct inode *ino, struct file *filep)
{
- if (iminor(ino)==WATCHDOG_MINOR)
- {
+ 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");
+ printk(KERN_CRIT PFX
+ "Unexpected close, not stopping watchdog!\n");
ipmi_heartbeat();
}
clear_bit(0, &ipmi_wdog_open);
.fops = &ipmi_wdog_fops
};
-static DECLARE_RWSEM(register_sem);
-
static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg,
void *handler_data)
{
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) {
+ 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);
static int
ipmi_nmi(void *dev_id, struct pt_regs *regs, int cpu, int handled)
{
+ /* If we are not expecting a timeout, ignore it. */
+ if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE)
+ return NOTIFY_DONE;
+
/* 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;
+ if ((!handled) && (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_DONE;
}
.handler = ipmi_nmi,
.priority = 0, /* Call us last. */
};
+int nmi_handler_registered;
#endif
static int wdog_reboot_handler(struct notifier_block *this,
};
-static void ipmi_new_smi(int if_num)
+static void ipmi_new_smi(int if_num, struct device *device)
{
ipmi_register_watchdog(if_num);
}
.smi_gone = ipmi_smi_gone
};
-static int __init ipmi_wdog_init(void)
+static int action_op(const char *inval, char *outval)
{
- int rv;
+ if (outval)
+ strcpy(outval, action);
- printk(KERN_INFO PFX "driver version "
- IPMI_WATCHDOG_VERSION "\n");
+ if (!inval)
+ return 0;
- if (strcmp(action, "reset") == 0) {
+ if (strcmp(inval, "reset") == 0)
action_val = WDOG_TIMEOUT_RESET;
- } else if (strcmp(action, "none") == 0) {
+ else if (strcmp(inval, "none") == 0)
action_val = WDOG_TIMEOUT_NONE;
- } else if (strcmp(action, "power_cycle") == 0) {
+ else if (strcmp(inval, "power_cycle") == 0)
action_val = WDOG_TIMEOUT_POWER_CYCLE;
- } else if (strcmp(action, "power_off") == 0) {
+ else if (strcmp(inval, "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);
- }
+ else
+ return -EINVAL;
+ strcpy(action, inval);
+ return 0;
+}
+
+static int preaction_op(const char *inval, char *outval)
+{
+ if (outval)
+ strcpy(outval, preaction);
- if (strcmp(preaction, "pre_none") == 0) {
+ if (!inval)
+ return 0;
+
+ if (strcmp(inval, "pre_none") == 0)
preaction_val = WDOG_PRETIMEOUT_NONE;
- } else if (strcmp(preaction, "pre_smi") == 0) {
+ else if (strcmp(inval, "pre_smi") == 0)
preaction_val = WDOG_PRETIMEOUT_SMI;
#ifdef HAVE_NMI_HANDLER
- } else if (strcmp(preaction, "pre_nmi") == 0) {
+ else if (strcmp(inval, "pre_nmi") == 0)
preaction_val = WDOG_PRETIMEOUT_NMI;
#endif
- } else if (strcmp(preaction, "pre_int") == 0) {
+ else if (strcmp(inval, "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);
- }
+ 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(preop, "preop_none") == 0) {
+ if (strcmp(inval, "preop_none") == 0)
preop_val = WDOG_PREOP_NONE;
- } else if (strcmp(preop, "preop_panic") == 0) {
+ else if (strcmp(inval, "preop_panic") == 0)
preop_val = WDOG_PREOP_PANIC;
- } else if (strcmp(preop, "preop_give_data") == 0) {
+ else if (strcmp(inval, "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);
- }
+ else
+ return -EINVAL;
+ strcpy(preop, inval);
+ return 0;
+}
+static void check_parms(void)
+{
#ifdef HAVE_NMI_HANDLER
+ 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_val = WDOG_PREOP_NONE;
+ preop_op("preop_none", NULL);
+ do_nmi = 0;
}
#ifdef CONFIG_X86_LOCAL_APIC
if (nmi_watchdog == NMI_IO_APIC) {
" Disabling IPMI nmi pretimeout.\n",
nmi_watchdog);
preaction_val = WDOG_PRETIMEOUT_NONE;
- } else {
+ do_nmi = 0;
+ }
#endif
+ }
+ if (do_nmi && !nmi_handler_registered) {
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
+ printk(KERN_WARNING PFX
+ "Can't register nmi handler\n");
+ return;
+ } else
+ nmi_handler_registered = 1;
+ } else if (!do_nmi && nmi_handler_registered) {
+ release_nmi(&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();
rv = ipmi_smi_watcher_register(&smi_watcher);
if (rv) {
}
register_reboot_notifier(&wdog_reboot_notifier);
- notifier_chain_register(&panic_notifier_list, &wdog_panic_notifier);
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &wdog_panic_notifier);
+
+ printk(KERN_INFO PFX "driver initialized\n");
return 0;
}
down_write(®ister_sem);
#ifdef HAVE_NMI_HANDLER
- if (preaction_val == WDOG_PRETIMEOUT_NMI)
+ if (nmi_handler_registered)
release_nmi(&ipmi_nmi_handler);
#endif
- notifier_chain_unregister(&panic_notifier_list, &wdog_panic_notifier);
+ atomic_notifier_chain_unregister(&panic_notifier_list,
+ &wdog_panic_notifier);
unregister_reboot_notifier(&wdog_reboot_notifier);
if (! watchdog_user)
/* 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);
- }
+ while (atomic_read(&set_timeout_tofree))
+ schedule_timeout_uninterruptible(1);
/* Disconnect from IPMI. */
rv = ipmi_destroy_user(watchdog_user);
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.");
git://git.onelab.eu / linux-2.6.git / blobdiff