ipmi: Make IPMI panic strings always available

They were set by config items, but people complained that they were
never turned on.  So have them always available and enabled by a
module parameter.

Signed-off-by: Corey Minyard <cminyard@mvista.com>

Documentation/IPMI.txt

@@ -81,7 +81,9 @@ If you want the driver to put an event into the event log on a panic,
 enable the 'Generate a panic event to all BMCs on a panic' option.  If
 you want the whole panic string put into the event log using OEM
 events, enable the 'Generate OEM events containing the panic string'
-option.
+option.  You can also enable these dynamically by setting the module
+parameter named "panic_op" in the ipmi_msghandler module to "event"
+or "string".  Setting that parameter to "none" disables this function.
 
 Basic Design
 ------------

drivers/char/ipmi/Kconfig

@@ -25,21 +25,28 @@ if IPMI_HANDLER
 config IPMI_PANIC_EVENT
        bool 'Generate a panic event to all BMCs on a panic'
        help
-         When a panic occurs, this will cause the IPMI message handler to
-	 generate an IPMI event describing the panic to each interface
-	 registered with the message handler.
+	 When a panic occurs, this will cause the IPMI message handler to,
+	 by default, generate an IPMI event describing the panic to each
+	 interface registered with the message handler.  This is always
+	 available, the module parameter for ipmi_msghandler named
+	 panic_op can be set to "event" to chose this value, this config
+	 simply causes the default value to be set to "event".
 
 config IPMI_PANIC_STRING
 	bool 'Generate OEM events containing the panic string'
 	depends on IPMI_PANIC_EVENT
 	help
-	  When a panic occurs, this will cause the IPMI message handler to
-	  generate IPMI OEM type f0 events holding the IPMB address of the
-	  panic generator (byte 4 of the event), a sequence number for the
-	  string (byte 5 of the event) and part of the string (the rest of the
-	  event).  Bytes 1, 2, and 3 are the normal usage for an OEM event.
-	  You can fetch these events and use the sequence numbers to piece the
-	  string together.
+	  When a panic occurs, this will cause the IPMI message handler to,
+	  by default, generate IPMI OEM type f0 events holding the IPMB
+	  address of the panic generator (byte 4 of the event), a sequence
+	  number for the string (byte 5 of the event) and part of the
+	  string (the rest of the event).  Bytes 1, 2, and 3 are the normal
+	  usage for an OEM event.  You can fetch these events and use the
+	  sequence numbers to piece the string together.  This config
+	  parameter sets the default value to generate these events,
+	  the module parameter for ipmi_msghandler named panic_op can
+	  be set to "string" to chose this value, this config simply
+	  causes the default value to be set to "string".
 
 config IPMI_DEVICE_INTERFACE
        tristate 'Device interface for IPMI'

drivers/char/ipmi/ipmi_msghandler.c

@@ -46,6 +46,7 @@
 #include <linux/proc_fs.h>
 #include <linux/rcupdate.h>
 #include <linux/interrupt.h>
+#include <linux/moduleparam.h>
 
 #define PFX "IPMI message handler: "
 
@@ -61,6 +62,74 @@ static int handle_one_recv_msg(ipmi_smi_t          intf,
 
 static int initialized;
 
+enum ipmi_panic_event_op {
+	IPMI_SEND_PANIC_EVENT_NONE,
+	IPMI_SEND_PANIC_EVENT,
+	IPMI_SEND_PANIC_EVENT_STRING
+};
+#ifdef CONFIG_IPMI_PANIC_STRING
+#define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT_STRING
+#elif defined(CONFIG_IPMI_PANIC_EVENT)
+#define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT
+#else
+#define IPMI_PANIC_DEFAULT IPMI_SEND_PANIC_EVENT_NONE
+#endif
+static enum ipmi_panic_event_op ipmi_send_panic_event = IPMI_PANIC_DEFAULT;
+
+static int panic_op_write_handler(const char *val,
+				  const struct kernel_param *kp)
+{
+	char valcp[16];
+	char *s;
+
+	strncpy(valcp, val, 16);
+	valcp[15] = '\0';
+
+	s = strstrip(valcp);
+
+	if (strcmp(s, "none") == 0)
+		ipmi_send_panic_event = IPMI_SEND_PANIC_EVENT_NONE;
+	else if (strcmp(s, "event") == 0)
+		ipmi_send_panic_event = IPMI_SEND_PANIC_EVENT;
+	else if (strcmp(s, "string") == 0)
+		ipmi_send_panic_event = IPMI_SEND_PANIC_EVENT_STRING;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static int panic_op_read_handler(char *buffer, const struct kernel_param *kp)
+{
+	switch (ipmi_send_panic_event) {
+	case IPMI_SEND_PANIC_EVENT_NONE:
+		strcpy(buffer, "none");
+		break;
+
+	case IPMI_SEND_PANIC_EVENT:
+		strcpy(buffer, "event");
+		break;
+
+	case IPMI_SEND_PANIC_EVENT_STRING:
+		strcpy(buffer, "string");
+		break;
+
+	default:
+		strcpy(buffer, "???");
+		break;
+	}
+
+	return strlen(buffer);
+}
+
+static const struct kernel_param_ops panic_op_ops = {
+	.set = panic_op_write_handler,
+	.get = panic_op_read_handler
+};
+module_param_cb(panic_op, &panic_op_ops, NULL, 0600);
+MODULE_PARM_DESC(panic_op, "Sets if the IPMI driver will attempt to store panic information in the event log in the event of a panic.  Set to 'none' for no, 'event' for a single event, or 'string' for a generic event and the panic string in IPMI OEM events.");
+
+
 #ifdef CONFIG_PROC_FS
 static struct proc_dir_entry *proc_ipmi_root;
 #endif /* CONFIG_PROC_FS */
@@ -4271,8 +4340,6 @@ void ipmi_free_recv_msg(struct ipmi_recv_msg *msg)
 }
 EXPORT_SYMBOL(ipmi_free_recv_msg);
 
-#ifdef CONFIG_IPMI_PANIC_EVENT
-
 static atomic_t panic_done_count = ATOMIC_INIT(0);
 
 static void dummy_smi_done_handler(struct ipmi_smi_msg *msg)
@@ -4320,7 +4387,6 @@ static void ipmi_panic_request_and_wait(ipmi_smi_t           intf,
 		ipmi_poll(intf);
 }
 
-#ifdef CONFIG_IPMI_PANIC_STRING
 static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
 {
 	if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
@@ -4347,7 +4413,6 @@ static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
 		intf->local_event_generator = (msg->msg.data[6] >> 5) & 1;
 	}
 }
-#endif
 
 static void send_panic_events(char *str)
 {
@@ -4357,6 +4422,9 @@ static void send_panic_events(char *str)
 	struct ipmi_system_interface_addr *si;
 	struct ipmi_addr                  addr;
 
+	if (ipmi_send_panic_event == IPMI_SEND_PANIC_EVENT_NONE)
+		return;
+
 	si = (struct ipmi_system_interface_addr *) &addr;
 	si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
 	si->channel = IPMI_BMC_CHANNEL;
@@ -4385,20 +4453,19 @@ static void send_panic_events(char *str)
 
 	/* For every registered interface, send the event. */
 	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
-		if (!intf->handlers)
-			/* Interface is not ready. */
+		if (!intf->handlers || !intf->handlers->poll)
+			/* Interface is not ready or can't run at panic time. */
 			continue;
 
 		/* Send the event announcing the panic. */
 		ipmi_panic_request_and_wait(intf, &addr, &msg);
 	}
 
-#ifdef CONFIG_IPMI_PANIC_STRING
 	/*
 	 * On every interface, dump a bunch of OEM event holding the
 	 * string.
 	 */
-	if (!str)
+	if (ipmi_send_panic_event != IPMI_SEND_PANIC_EVENT_STRING || !str)
 		return;
 
 	/* For every registered interface, send the event. */
@@ -4507,9 +4574,7 @@ static void send_panic_events(char *str)
 			ipmi_panic_request_and_wait(intf, &addr, &msg);
 		}
 	}
-#endif /* CONFIG_IPMI_PANIC_STRING */
 }
-#endif /* CONFIG_IPMI_PANIC_EVENT */
 
 static int has_panicked;
 
@@ -4547,12 +4612,12 @@ static int panic_event(struct notifier_block *this,
 			spin_unlock(&intf->waiting_rcv_msgs_lock);
 
 		intf->run_to_completion = 1;
-		intf->handlers->set_run_to_completion(intf->send_info, 1);
+		if (intf->handlers->set_run_to_completion)
+			intf->handlers->set_run_to_completion(intf->send_info,
+							      1);
 	}
 
-#ifdef CONFIG_IPMI_PANIC_EVENT
 	send_panic_events(ptr);
-#endif
 
 	return NOTIFY_DONE;
 }