ipmi: Add a maintenance mode for IPMB messages

If you send a command to another BMC that might take some extra
time, increase the timeouts temporarily.

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

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index add8130..dcfbf2e 100644 (file)
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -143,6 +143,12 @@ module_param(default_retry_ms, ulong, 0644);
 MODULE_PARM_DESC(default_retry_ms,
                 "The time (milliseconds) between retry sends");
 
+/* The default timeout for maintenance mode message retries. */
+static unsigned long default_maintenance_retry_ms = 3000;
+module_param(default_maintenance_retry_ms, ulong, 0644);
+MODULE_PARM_DESC(default_maintenance_retry_ms,
+                "The time (milliseconds) between retry sends in maintenance mode");
+
 /* The default maximum number of retries */
 static unsigned int default_max_retries = 4;
 module_param(default_max_retries, uint, 0644);
@@ -525,6 +531,13 @@ struct ipmi_smi {
        spinlock_t maintenance_mode_lock; /* Used in a timer... */
 
        /*
+        * If we are doing maintenance on something on IPMB, extend
+        * the timeout time to avoid timeouts writing firmware and
+        * such.
+        */
+       int ipmb_maintenance_mode_timeout;
+
+       /*
         * 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
@@ -1861,6 +1874,15 @@ static int i_ipmi_request(ipmi_user_t          user,
 
                        spin_lock_irqsave(&(intf->seq_lock), flags);
 
+                       if (is_maintenance_mode_cmd(msg))
+                               intf->ipmb_maintenance_mode_timeout =
+                                       maintenance_mode_timeout_ms;
+
+                       if (intf->ipmb_maintenance_mode_timeout &&
+                           retry_time_ms == 0)
+                               /* Different default in maintenance mode */
+                               retry_time_ms = default_maintenance_retry_ms;
+
                        /*
                         * Create a sequence number with a 1 second
                         * timeout and 4 retries.
@@ -4710,6 +4732,12 @@ static unsigned int ipmi_timeout_handler(ipmi_smi_t intf,
         */
        INIT_LIST_HEAD(&timeouts);
        spin_lock_irqsave(&intf->seq_lock, flags);
+       if (intf->ipmb_maintenance_mode_timeout) {
+               if (intf->ipmb_maintenance_mode_timeout <= timeout_period)
+                       intf->ipmb_maintenance_mode_timeout = 0;
+               else
+                       intf->ipmb_maintenance_mode_timeout -= timeout_period;
+       }
        for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
                check_msg_timeout(intf, &(intf->seq_table[i]),
                                  &timeouts, timeout_period, i,