From cc4673eecdcc4a918e4d8796295d798b5e98d602 Mon Sep 17 00:00:00 2001 From: Corey Minyard Date: Mon, 7 Nov 2005 00:59:57 -0800 Subject: [PATCH] [PATCH] ipmi: watchdog parms in sysfs Modify the IPMI watchdog parameters (the ones that make sense) to be exported from sysfs. This is somewhat complicated because these parameters have side-effects that must be handled. Signed-off-by: Corey Minyard Cc: Matt Domsch Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/ipmi/ipmi_watchdog.c | 246 ++++++++++++++++++++++++------ 1 file changed, 196 insertions(+), 50 deletions(-) diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c index 2da64bf746..405697a9f4 100644 --- a/drivers/char/ipmi/ipmi_watchdog.c +++ b/drivers/char/ipmi/ipmi_watchdog.c @@ -47,6 +47,8 @@ #include #include #include +#include +#include #ifdef CONFIG_X86_LOCAL_APIC #include #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(®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. */ @@ -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(®ister_sem); #ifdef HAVE_NMI_HANDLER - if (preaction_val == WDOG_PRETIMEOUT_NMI) + if (nmi_handler_registered) release_nmi(&ipmi_nmi_handler); #endif -- 2.39.5