#include <linux/moduleparam.h>
#include <linux/ipmi.h>
#include <linux/ipmi_smi.h>
+#include <linux/smp_lock.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/init.h>
#include <asm/atomic.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. */
+/*
+ * 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
/* 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. */
+/* Cause data to be available to read. Doesn't work in NMI mode. */
+#define WDOG_PREOP_GIVE_DATA 2
/* Actions to perform on a full timeout. */
#define WDOG_SET_TIMEOUT_ACT(byte, use) \
#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. */
+/*
+ * 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_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). */
+/*
+ * 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) \
static void ipmi_register_watchdog(int ipmi_intf);
static void ipmi_unregister_watchdog(int ipmi_intf);
-/* If true, the driver will start running as soon as it is configured
- and ready. */
+/*
+ * If true, the driver will start running as soon as it is configured
+ * and ready.
+ */
static int start_now;
static int set_param_int(const char *val, struct kernel_param *kp)
/* Is someone using the watchdog? Only one user is allowed. */
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. */
+/*
+ * 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;
/* IPMI version of the BMC. */
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.
- The mutex is claimed when the set_timeout is sent and freed
- when both messages are free. */
+/*
+ * 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 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 DEFINE_MUTEX(set_timeout_lock);
static DECLARE_COMPLETION(set_timeout_wait);
if (atomic_dec_and_test(&set_timeout_tofree))
complete(&set_timeout_wait);
}
-static struct ipmi_smi_msg set_timeout_smi_msg =
-{
+static struct ipmi_smi_msg set_timeout_smi_msg = {
.done = set_timeout_free_smi
};
-static struct ipmi_recv_msg set_timeout_recv_msg =
-{
+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)
WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
if ((ipmi_version_major > 1)
- || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5)))
- {
+ || ((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. */
+ /*
+ * In ipmi 1.0, setting the timer stops the watchdog, we
+ * need to start it back up again.
+ */
hbnow = 1;
}
atomic_dec(&panic_done_count);
}
-static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg =
-{
+static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = {
.done = panic_smi_free
};
-static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg =
-{
+static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = {
.done = panic_recv_free
};
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. */
+ /*
+ * 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;
atomic_add(2, &panic_done_count);
}
-static struct ipmi_smi_msg panic_halt_smi_msg =
-{
+static struct ipmi_smi_msg panic_halt_smi_msg = {
.done = panic_smi_free
};
-static struct ipmi_recv_msg panic_halt_recv_msg =
-{
+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. */
+/*
+ * 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;
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. */
+/*
+ * We use a mutex 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);
if (atomic_dec_and_test(&heartbeat_tofree))
complete(&heartbeat_wait);
}
-static struct ipmi_smi_msg heartbeat_smi_msg =
-{
+static struct ipmi_smi_msg heartbeat_smi_msg = {
.done = heartbeat_free_smi
};
-static struct ipmi_recv_msg heartbeat_recv_msg =
-{
+static struct ipmi_recv_msg heartbeat_recv_msg = {
.done = heartbeat_free_recv
};
-
+
static int ipmi_heartbeat(void)
{
struct kernel_ipmi_msg msg;
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. */
+ /*
+ * 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);
}
atomic_set(&heartbeat_tofree, 2);
- /* Don't reset the timer if we have the timer turned off, that
- re-enables the watchdog. */
+ /*
+ * 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;
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;
+ /*
+ * 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 =
-{
+static struct watchdog_info ident = {
.options = 0, /* WDIOF_SETTIMEOUT, */
.firmware_version = 1,
.identity = "IPMI"
int i;
int val;
- switch(cmd) {
+ switch (cmd) {
case WDIOC_GETSUPPORT:
i = copy_to_user(argp, &ident, sizeof(ident));
return i ? -EFAULT : 0;
i = copy_from_user(&val, argp, sizeof(int));
if (i)
return -EFAULT;
- if (val & WDIOS_DISABLECARD)
- {
+ 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)
- {
+ if (val & WDIOS_ENABLECARD) {
ipmi_watchdog_state = action_val;
ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
}
int rv;
if (len) {
- if (!nowayout) {
- size_t i;
+ if (!nowayout) {
+ size_t i;
/* In case it was set long ago */
expect_close = 0;
- for (i = 0; i != len; i++) {
+ for (i = 0; i != len; i++) {
char c;
if (get_user(c, buf + i))
rv = ipmi_heartbeat();
if (rv)
return rv;
- return 1;
}
- return 0;
+ return len;
}
static ssize_t ipmi_read(struct file *file,
if (count <= 0)
return 0;
- /* Reading returns if the pretimeout has gone off, and it only does
- it once per pretimeout. */
+ /*
+ * 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) {
spin_lock(&ipmi_read_lock);
}
remove_wait_queue(&read_q, &wait);
-
+
if (signal_pending(current)) {
rv = -ERESTARTSYS;
goto out;
static int ipmi_open(struct inode *ino, struct file *filep)
{
- switch (iminor(ino)) {
- case WATCHDOG_MINOR:
+ switch (iminor(ino)) {
+ case WATCHDOG_MINOR:
if (test_and_set_bit(0, &ipmi_wdog_open))
- return -EBUSY;
+ return -EBUSY;
+
+ cycle_kernel_lock();
- /* Don't start the timer now, let it start on the
- first heartbeat. */
+ /*
+ * 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);
clear_bit(0, &ipmi_wdog_open);
}
- ipmi_fasync (-1, filep, 0);
+ ipmi_fasync(-1, filep, 0);
expect_close = 0;
return 0;
msg->msg.data[0],
msg->msg.cmd);
}
-
+
ipmi_free_recv_msg(msg);
}
}
}
- /* On some machines, the heartbeat will give
- an error and not work unless we re-enable
- the timer. So do so. */
+ /*
+ * 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 =
-{
+static struct ipmi_user_hndl ipmi_hndlrs = {
.ipmi_recv_hndl = ipmi_wdog_msg_handler,
.ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler
};
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. */
+ /*
+ * 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;
" occur. The NMI pretimeout will"
" likely not work\n");
}
- out_restore:
+ out_restore:
testing_nmi = 0;
preop_val = old_preop_val;
pretimeout = old_pretimeout;
/* 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. */
+ /*
+ * 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);
return NOTIFY_STOP;
}
- /* If we are not expecting a timeout, ignore it. */
+ /* 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 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
unsigned long code,
void *unused)
{
- static int reboot_event_handled = 0;
+ static int reboot_event_handled;
if ((watchdog_user) && (!reboot_event_handled)) {
/* Make sure we only do this once. */
unsigned long event,
void *unused)
{
- static int panic_event_handled = 0;
+ static int panic_event_handled;
/* On a panic, if we have a panic timeout, make sure to extend
the watchdog timer to a reasonable value to complete the
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();
ipmi_unregister_watchdog(if_num);
}
-static struct ipmi_smi_watcher smi_watcher =
-{
+static struct ipmi_smi_watcher smi_watcher = {
.owner = THIS_MODULE,
.new_smi = ipmi_new_smi,
.smi_gone = ipmi_smi_gone
git.openpandora.org / pandora-kernel.git / blobdiff