IPMI fix for panic handling

From: Corey Minyard
Date: Thu Aug 21 2003 - 08:50:33 EST

This patch adds something I missed that previous IPMI drivers did, adding panic information to the event log. Some programs use this information to analyze panics. Please apply.

Thanks,

-Corey Index: drivers/char/ipmi/Kconfig
===================================================================
RCS file: /home/cvs/linux-2.5/drivers/char/ipmi/Kconfig,v
retrieving revision 1.3
diff -u -r1.3 Kconfig
--- drivers/char/ipmi/Kconfig 28 Mar 2003 05:14:18 -0000 1.3
+++ drivers/char/ipmi/Kconfig 19 Aug 2003 14:20:43 -0000
@@ -24,6 +24,18 @@
generate an IPMI event describing the panic to each interface
registered with the message handler.

+config IPMI_PANIC_STRING
+ bool 'Generate a OEM events holding the panic string'
+ depends on IPMI_PANIC_EVENT
+ help
+ When a panic occurs, this will cause the IPMI message handler to
+ generate an 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.
+
config IPMI_DEVICE_INTERFACE
tristate 'Device interface for IPMI'
depends on IPMI_HANDLER
Index: drivers/char/ipmi/ipmi_msghandler.c
===================================================================
RCS file: /home/cvs/linux-2.5/drivers/char/ipmi/ipmi_msghandler.c,v
retrieving revision 1.7
diff -u -r1.7 ipmi_msghandler.c
--- drivers/char/ipmi/ipmi_msghandler.c 24 May 2003 17:02:51 -0000 1.7
+++ drivers/char/ipmi/ipmi_msghandler.c 19 Aug 2003 14:20:45 -0000
@@ -169,6 +169,19 @@
/* My LUN. This should generally stay the SMS LUN, but just in
case... */
unsigned char my_lun;
+
+ /* The event receiver for my BMC, only really used at panic
+ shutdown as a place to store this. */
+ unsigned char event_receiver;
+ unsigned char event_receiver_lun;
+ unsigned char local_sel_device;
+ unsigned char local_event_generator;
+
+ /* A cheap hack, if this is non-null and a message to an
+ interface comes in with a NULL user, call this routine with
+ it. Note that the message will still be freed by the
+ caller. This only works on the system interface. */
+ void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_smi_msg *msg);
};

int
@@ -1465,6 +1478,9 @@
}

if (!found) {
+ /* Special handling for NULL users. */
+ if (!recv_msg->user && intf->null_user_handler)
+ intf->null_user_handler(intf, msg);
/* The user for the message went away, so give up. */
ipmi_free_recv_msg(recv_msg);
} else {
@@ -1813,18 +1829,48 @@
{
}

-static void send_panic_events(void)
+#ifdef CONFIG_IPMI_PANIC_STRING
+static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_smi_msg *msg)
+{
+ if ((msg->rsp[0] == (0x5 << 2))
+ && (msg->rsp[1] == 1)
+ && (msg->rsp[2] == 0))
+ {
+ /* A get event receiver command, save it. */
+ intf->event_receiver = msg->rsp[3];
+ intf->event_receiver_lun = msg->rsp[4] & 0x3;
+ }
+}
+
+static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_smi_msg *msg)
+{
+ if ((msg->rsp[0] == (0x7 << 2))
+ && (msg->rsp[1] == 1)
+ && (msg->rsp[2] == 0))
+ {
+ /* A get device id command, save if we are an event
+ receiver or generator. */
+ intf->local_sel_device = (msg->rsp[8] >> 2) & 1;
+ intf->local_event_generator = (msg->rsp[8] >> 5) & 1;
+ }
+}
+#endif
+
+static void send_panic_events(char *str)
{
struct ipmi_msg msg;
ipmi_smi_t intf;
- unsigned char data[8];
+ unsigned char data[16];
int i;
- struct ipmi_system_interface_addr addr;
+ struct ipmi_system_interface_addr *si;
+ struct ipmi_addr addr;
struct ipmi_smi_msg smi_msg;
struct ipmi_recv_msg recv_msg;

- addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
- addr.channel = IPMI_BMC_CHANNEL;
+ si = (struct ipmi_system_interface_addr *) &addr;
+ si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
+ si->channel = IPMI_BMC_CHANNEL;
+ si->lun = 0;

/* Fill in an event telling that we have failed. */
msg.netfn = 0x04; /* Sensor or Event. */
@@ -1837,12 +1883,13 @@
data[4] = 0x6f; /* Sensor specific, IPMI table 36-1 */
data[5] = 0xa1; /* Runtime stop OEM bytes 2 & 3. */

- /* These used to have the first three bytes of the panic string,
- but not only is that not terribly useful, it's not available
- any more. */
- data[3] = 0;
- data[6] = 0;
- data[7] = 0;
+ /* Put a few breadcrums in. Hopefully later we can add more things
+ to make the panic events more useful. */
+ if (str) {
+ data[3] = str[0];
+ data[6] = str[1];
+ data[7] = str[2];
+ }

smi_msg.done = dummy_smi_done_handler;
recv_msg.done = dummy_recv_done_handler;
@@ -1853,10 +1900,11 @@
if (intf == NULL)
continue;

+ /* Send the event announcing the panic. */
intf->handlers->set_run_to_completion(intf->send_info, 1);
i_ipmi_request(NULL,
intf,
- (struct ipmi_addr *) &addr,
+ &addr,
0,
&msg,
&smi_msg,
@@ -1865,6 +1913,130 @@
intf->my_address,
intf->my_lun);
}
+
+#ifdef CONFIG_IPMI_PANIC_STRING
+ /* On every interface, dump a bunch of OEM event holding the
+ string. */
+ if (!str)
+ return;
+
+ for (i=0; i<MAX_IPMI_INTERFACES; i++) {
+ char *p = str;
+ struct ipmi_ipmb_addr *ipmb;
+ int j;
+
+ intf = ipmi_interfaces[i];
+ if (intf == NULL)
+ continue;
+
+ /* First job here is to figure out where to send the
+ OEM events. There's no way in IPMI to send OEM
+ events using an event send command, so we have to
+ find the SEL to put them in and stick them in
+ there. */
+
+ /* Get capabilities from the get device id. */
+ intf->local_sel_device = 0;
+ intf->local_event_generator = 0;
+ intf->event_receiver = 0;
+
+ /* Request the device info from the local MC. */
+ msg.netfn = 0x06; /* App. */
+ msg.cmd = 0x01; /* Get device id cmd */
+ msg.data = NULL;
+ msg.data_len = 0;
+ intf->null_user_handler = device_id_fetcher;
+ i_ipmi_request(NULL,
+ intf,
+ &addr,
+ 0,
+ &msg,
+ &smi_msg,
+ &recv_msg,
+ 0,
+ intf->my_address,
+ intf->my_lun);
+
+ if (intf->local_event_generator) {
+ /* Request the event receiver from the local MC. */
+ msg.netfn = 0x04; /* Sensor or Event. */
+ msg.cmd = 0x01; /* Get Event Receiver cmd */
+ msg.data = NULL;
+ msg.data_len = 0;
+ intf->null_user_handler = event_receiver_fetcher;
+ i_ipmi_request(NULL,
+ intf,
+ &addr,
+ 0,
+ &msg,
+ &smi_msg,
+ &recv_msg,
+ 0,
+ intf->my_address,
+ intf->my_lun);
+ }
+ intf->null_user_handler = NULL;
+
+ /* Validate the event receiver. The low bit must not
+ be 1 (it must be a valid IPMB address), it cannot
+ be zero, and it must not be my address. */
+ if (((intf->event_receiver & 1) == 0)
+ && (intf->event_receiver != 0)
+ && (intf->event_receiver != intf->my_address))
+ {
+ /* The event receiver is valid, send an IPMB
+ message. */
+ ipmb = (struct ipmi_ipmb_addr *) &addr;
+ ipmb->addr_type = IPMI_IPMB_ADDR_TYPE;
+ ipmb->channel = 0; /* FIXME - is this right? */
+ ipmb->lun = intf->event_receiver_lun;
+ ipmb->slave_addr = intf->event_receiver;
+ } else if (intf->local_sel_device) {
+ /* The event receiver was not valid (or was
+ me), but I am an SEL device, just dump it
+ in my SEL. */
+ si = (struct ipmi_system_interface_addr *) &addr;
+ si->addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
+ si->channel = IPMI_BMC_CHANNEL;
+ si->lun = 0;
+ } else
+ continue; /* No where to send the event. */
+
+
+ msg.netfn = 0x0a; /* Storage. */
+ msg.cmd = 0x44; /* Add SEL entry command. */
+ msg.data = data;
+ msg.data_len = 16;
+
+ j = 0;
+ while (*p) {
+ int size = strlen(p);
+
+ if (size > 11)
+ size = 11;
+ data[0] = 0;
+ data[1] = 0;
+ data[2] = 0xf0; /* OEM event without timestamp. */
+ data[3] = intf->my_address;
+ data[4] = j++; /* sequence # */
+ /* Always give 11 bytes, so strncpy will fill
+ it with zeroes for me. */
+ strncpy(data+5, p, 11);
+ p += size;
+
+ i_ipmi_request(NULL,
+ intf,
+ &addr,
+ 0,
+ &msg,
+ &smi_msg,
+ &recv_msg,
+ 0,
+ intf->my_address,
+ intf->my_lun);
+ }
+ }
+#endif /* CONFIG_IPMI_PANIC_STRING */
}
#endif /* CONFIG_IPMI_PANIC_EVENT */

@@ -1891,7 +2063,7 @@
}

#ifdef CONFIG_IPMI_PANIC_EVENT
- send_panic_events();
+ send_panic_events(ptr);
#endif

return NOTIFY_DONE;