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-rw-r--r--drivers/char/ipmi/ipmi_watchdog.c134
1 files changed, 42 insertions, 92 deletions
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 147c12047cf3..41f78e2c158f 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -50,18 +50,10 @@
#include <linux/poll.h>
#include <linux/string.h>
#include <linux/ctype.h>
-#include <linux/delay.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. */
-#define HAVE_DIE_NMI_POST
+#ifdef CONFIG_X86_LOCAL_APIC
+#include <asm/apic.h>
#endif
#define PFX "IPMI Watchdog: "
@@ -327,11 +319,6 @@ 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);
-#ifdef HAVE_DIE_NMI_POST
-static int testing_nmi;
-static int nmi_handler_registered;
-#endif
-
static int ipmi_heartbeat(void);
static void panic_halt_ipmi_heartbeat(void);
@@ -373,10 +360,6 @@ static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg,
int hbnow = 0;
- /* These can be cleared as we are setting the timeout. */
- ipmi_start_timer_on_heartbeat = 0;
- pretimeout_since_last_heartbeat = 0;
-
data[0] = 0;
WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS);
@@ -451,12 +434,13 @@ static int ipmi_set_timeout(int do_heartbeat)
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;
@@ -536,10 +520,12 @@ static int ipmi_heartbeat(void)
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;
ipmi_watchdog_state = action_val;
return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB);
} else if (pretimeout_since_last_heartbeat) {
@@ -547,6 +533,7 @@ static int ipmi_heartbeat(void)
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);
}
@@ -934,45 +921,6 @@ static void ipmi_register_watchdog(int ipmi_intf)
printk(KERN_CRIT PFX "Unable to register misc device\n");
}
-#ifdef HAVE_DIE_NMI_POST
- 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:
up_write(&register_sem);
@@ -982,10 +930,6 @@ static void ipmi_register_watchdog(int ipmi_intf)
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);
}
}
@@ -1022,28 +966,17 @@ static void ipmi_unregister_watchdog(int ipmi_intf)
up_write(&register_sem);
}
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
static int
-ipmi_nmi(struct notifier_block *self, unsigned long val, void *data)
+ipmi_nmi(void *dev_id, int cpu, int handled)
{
- if (val != DIE_NMI_POST)
- return NOTIFY_OK;
-
- 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;
+ return NOTIFY_DONE;
/* If no one else handled the NMI, we assume it was the IPMI
watchdog. */
- if (preop_val == WDOG_PREOP_PANIC) {
+ 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. */
@@ -1052,12 +985,18 @@ ipmi_nmi(struct notifier_block *self, unsigned long val, void *data)
panic(PFX "pre-timeout");
}
- return NOTIFY_STOP;
+ return NOTIFY_DONE;
}
-static struct notifier_block ipmi_nmi_handler = {
- .notifier_call = ipmi_nmi
+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. */
};
+int nmi_handler_registered;
#endif
static int wdog_reboot_handler(struct notifier_block *this,
@@ -1174,7 +1113,7 @@ static int preaction_op(const char *inval, char *outval)
preaction_val = WDOG_PRETIMEOUT_NONE;
else if (strcmp(inval, "pre_smi") == 0)
preaction_val = WDOG_PRETIMEOUT_SMI;
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
else if (strcmp(inval, "pre_nmi") == 0)
preaction_val = WDOG_PRETIMEOUT_NMI;
#endif
@@ -1208,7 +1147,7 @@ static int preop_op(const char *inval, char *outval)
static void check_parms(void)
{
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
int do_nmi = 0;
int rv;
@@ -1221,9 +1160,20 @@ static void check_parms(void)
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 = register_die_notifier(&ipmi_nmi_handler);
+ rv = request_nmi(&ipmi_nmi_handler);
if (rv) {
printk(KERN_WARNING PFX
"Can't register nmi handler\n");
@@ -1231,7 +1181,7 @@ static void check_parms(void)
} else
nmi_handler_registered = 1;
} else if (!do_nmi && nmi_handler_registered) {
- unregister_die_notifier(&ipmi_nmi_handler);
+ release_nmi(&ipmi_nmi_handler);
nmi_handler_registered = 0;
}
#endif
@@ -1267,9 +1217,9 @@ static int __init ipmi_wdog_init(void)
rv = ipmi_smi_watcher_register(&smi_watcher);
if (rv) {
-#ifdef HAVE_DIE_NMI_POST
- if (nmi_handler_registered)
- unregister_die_notifier(&ipmi_nmi_handler);
+#ifdef HAVE_NMI_HANDLER
+ if (preaction_val == WDOG_PRETIMEOUT_NMI)
+ release_nmi(&ipmi_nmi_handler);
#endif
atomic_notifier_chain_unregister(&panic_notifier_list,
&wdog_panic_notifier);
@@ -1288,9 +1238,9 @@ static void __exit ipmi_wdog_exit(void)
ipmi_smi_watcher_unregister(&smi_watcher);
ipmi_unregister_watchdog(watchdog_ifnum);
-#ifdef HAVE_DIE_NMI_POST
+#ifdef HAVE_NMI_HANDLER
if (nmi_handler_registered)
- unregister_die_notifier(&ipmi_nmi_handler);
+ release_nmi(&ipmi_nmi_handler);
#endif
atomic_notifier_chain_unregister(&panic_notifier_list,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.