#include <linux/miscdevice.h>
#include <linux/init.h>
#include <linux/completion.h>
+#include <linux/kdebug.h>
#include <linux/rwsem.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
#include <linux/poll.h>
#include <linux/string.h>
#include <linux/ctype.h>
+#include <linux/delay.h>
#include <asm/atomic.h>
-#ifdef CONFIG_X86_LOCAL_APIC
-#include <asm/apic.h>
+
+#ifdef CONFIG_X86
+/* This is ugly, but I've determined that x86 is the only architecture
+ that can reasonably support the IPMI NMI watchdog timeout at this
+ time. If another architecture adds this capability somehow, it
+ will have to be a somewhat different mechanism and I have no idea
+ how it will work. So in the unlikely event that another
+ architecture supports this, we can figure out a good generic
+ mechanism for it at that time. */
+#include <asm/kdebug.h>
+#define HAVE_DIE_NMI
#endif
#define PFX "IPMI Watchdog: "
static int nowayout = WATCHDOG_NOWAYOUT;
-static ipmi_user_t watchdog_user = NULL;
+static ipmi_user_t watchdog_user;
static int watchdog_ifnum;
/* Default the timeout to 10 seconds. */
static int timeout = 10;
/* The pre-timeout is disabled by default. */
-static int pretimeout = 0;
+static int pretimeout;
/* Default action is to reset the board on a timeout. */
static unsigned char action_val = WDOG_TIMEOUT_RESET;
static char preop[16] = "preop_none";
static DEFINE_SPINLOCK(ipmi_read_lock);
-static char data_to_read = 0;
+static char data_to_read;
static DECLARE_WAIT_QUEUE_HEAD(read_q);
-static struct fasync_struct *fasync_q = NULL;
-static char pretimeout_since_last_heartbeat = 0;
+static struct fasync_struct *fasync_q;
+static char pretimeout_since_last_heartbeat;
static char expect_close;
static int ifnum_to_use = -1;
-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
/* If true, the driver will start running as soon as it is configured
and ready. */
-static int start_now = 0;
+static int start_now;
static int set_param_int(const char *val, struct kernel_param *kp)
{
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;
}
{
action_fn fn = (action_fn) kp->arg;
int rv = 0;
- char *dup, *s;
+ char valcp[16];
+ char *s;
- dup = kstrdup(val, GFP_KERNEL);
- if (!dup)
- return -ENOMEM;
+ strncpy(valcp, val, 16);
+ valcp[15] = '\0';
- s = strstrip(dup);
+ s = strstrip(valcp);
- down_read(®ister_sem);
rv = fn(s, NULL);
if (rv)
- goto out_unlock;
+ goto out;
check_parms();
if (watchdog_user)
rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
- out_unlock:
- up_read(®ister_sem);
- kfree(dup);
+ out:
return rv;
}
static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE;
/* If shutting down via IPMI, we ignore the heartbeat. */
-static int ipmi_ignore_heartbeat = 0;
+static int ipmi_ignore_heartbeat;
/* Is someone using the watchdog? Only one user is allowed. */
-static unsigned long ipmi_wdog_open = 0;
+static unsigned long ipmi_wdog_open;
/* 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;
+static int ipmi_start_timer_on_heartbeat;
/* IPMI version of the BMC. */
static unsigned char ipmi_version_major;
/* 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);
+#ifdef HAVE_DIE_NMI
+static int testing_nmi;
+static int nmi_handler_registered;
+#endif
+static int ipmi_heartbeat(void);
/* 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.
int hbnow = 0;
+ /* These can be cleared as we are setting the timeout. */
+ pretimeout_since_last_heartbeat = 0;
+
data[0] = 0;
WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
wait_for_completion(&set_timeout_wait);
+ mutex_unlock(&set_timeout_lock);
+
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;
}
-static void dummy_smi_free(struct ipmi_smi_msg *msg)
+static atomic_t panic_done_count = ATOMIC_INIT(0);
+
+static void panic_smi_free(struct ipmi_smi_msg *msg)
{
+ atomic_dec(&panic_done_count);
}
-static void dummy_recv_free(struct ipmi_recv_msg *msg)
+static void panic_recv_free(struct ipmi_recv_msg *msg)
{
+ atomic_dec(&panic_done_count);
+}
+
+static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg =
+{
+ .done = panic_smi_free
+};
+static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg =
+{
+ .done = panic_recv_free
+};
+
+static void panic_halt_ipmi_heartbeat(void)
+{
+ struct kernel_ipmi_msg msg;
+ 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 = dummy_smi_free
+ .done = panic_smi_free
};
static struct ipmi_recv_msg panic_halt_recv_msg =
{
- .done = dummy_recv_free
+ .done = panic_recv_free
};
/* Special call, doesn't claim any locks. This is only to be called
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
.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) {
+ if (ipmi_ignore_heartbeat)
return 0;
- }
if (ipmi_start_timer_on_heartbeat) {
ipmi_start_timer_on_heartbeat = 0;
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);
}
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, */
{
int rv = -EBUSY;
- down_write(®ister_sem);
if (watchdog_user)
goto out;
printk(KERN_CRIT PFX "Unable to register misc device\n");
}
- out:
- up_write(®ister_sem);
+#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);
}
}
{
int rv;
- down_write(®ister_sem);
-
if (!watchdog_user)
goto out;
watchdog_user = NULL;
out:
- up_write(®ister_sem);
+ return;
}
-#ifdef HAVE_NMI_HANDLER
+#ifdef HAVE_DIE_NMI
static int
-ipmi_nmi(void *dev_id, int cpu, int handled)
+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_DONE;
+ 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 ((!handled) && (preop_val == WDOG_PREOP_PANIC)) {
+ 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. */
panic(PFX "pre-timeout");
}
- return NOTIFY_DONE;
+ return NOTIFY_STOP;
}
-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. */
+static struct notifier_block ipmi_nmi_handler = {
+ .notifier_call = ipmi_nmi
};
-int nmi_handler_registered;
#endif
static int wdog_reboot_handler(struct notifier_block *this,
/* Make sure we only do this once. */
reboot_event_handled = 1;
- if (code == SYS_DOWN || code == SYS_HALT) {
+ 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();
preaction_val = WDOG_PRETIMEOUT_NONE;
else if (strcmp(inval, "pre_smi") == 0)
preaction_val = WDOG_PRETIMEOUT_SMI;
-#ifdef HAVE_NMI_HANDLER
+#ifdef HAVE_DIE_NMI
else if (strcmp(inval, "pre_nmi") == 0)
preaction_val = WDOG_PRETIMEOUT_NMI;
#endif
static void check_parms(void)
{
-#ifdef HAVE_NMI_HANDLER
+#ifdef HAVE_DIE_NMI
int do_nmi = 0;
int rv;
preop_op("preop_none", NULL);
do_nmi = 0;
}
-#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;
- do_nmi = 0;
- }
-#endif
}
if (do_nmi && !nmi_handler_registered) {
- rv = request_nmi(&ipmi_nmi_handler);
+ rv = register_die_notifier(&ipmi_nmi_handler);
if (rv) {
printk(KERN_WARNING PFX
"Can't register nmi handler\n");
} else
nmi_handler_registered = 1;
} else if (!do_nmi && nmi_handler_registered) {
- release_nmi(&ipmi_nmi_handler);
+ unregister_die_notifier(&ipmi_nmi_handler);
nmi_handler_registered = 0;
}
#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);
+#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);
ipmi_smi_watcher_unregister(&smi_watcher);
ipmi_unregister_watchdog(watchdog_ifnum);
-#ifdef HAVE_NMI_HANDLER
+#ifdef HAVE_DIE_NMI
if (nmi_handler_registered)
- release_nmi(&ipmi_nmi_handler);
+ unregister_die_notifier(&ipmi_nmi_handler);
#endif
atomic_notifier_chain_unregister(&panic_notifier_list,
projects / linux-2.6-omap-h63xx.git / blobdiff