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-rw-r--r--drivers/char/ipmi/ipmi_watchdog.c246
1 files changed, 196 insertions, 50 deletions
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 2da64bf7469c..405697a9f4d9 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -47,6 +47,8 @@
#include <linux/reboot.h>
#include <linux/wait.h>
#include <linux/poll.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/apic.h>
#endif
@@ -158,27 +160,120 @@ static struct fasync_struct *fasync_q = 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(&register_sem);
+ *((int *)kp->arg) = l;
+ if (watchdog_user)
+ rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY);
+ up_read(&register_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(&register_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(&register_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. */
@@ -294,11 +389,6 @@ static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg,
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;
@@ -732,8 +822,6 @@ static struct miscdevice ipmi_wdog_miscdev = {
.fops = &ipmi_wdog_fops
};
-static DECLARE_RWSEM(register_sem);
-
static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg,
void *handler_data)
{
@@ -839,6 +927,7 @@ static struct nmi_handler ipmi_nmi_handler =
.handler = ipmi_nmi,
.priority = 0, /* Call us last. */
};
+int nmi_handler_registered;
#endif
static int wdog_reboot_handler(struct notifier_block *this,
@@ -921,59 +1010,86 @@ static struct ipmi_smi_watcher smi_watcher =
.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);
+
+ 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 (strcmp(preop, "preop_none") == 0) {
+ if (!inval)
+ return 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) {
@@ -983,18 +1099,48 @@ static int __init ipmi_wdog_init(void)
" 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) {
@@ -1021,7 +1167,7 @@ static __exit void ipmi_unregister_watchdog(void)
down_write(&register_sem);
#ifdef HAVE_NMI_HANDLER
- if (preaction_val == WDOG_PRETIMEOUT_NMI)
+ if (nmi_handler_registered)
release_nmi(&ipmi_nmi_handler);
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 23:40:10 +0000