[PATCH] ipmi: various si cleanup

A number of small changes for the various system interface drivers,
consolidated from a number of patches from Matt Domsch.

Clear B2H_ATN and drain the BMC message buffer on command timeout.  This
prevents further commands from failing after a timeout.

Add bt_debug and smic_debug module parameters, expose them in sysfs.  This
lets you enable and disable debugging messages at runtime.

Unsigned jiffies math in ipmi_si_intf.c causes a too-large value to be passed
to ->event() after jiffies wrap-around.  The BT driver had caught this, but
didn't know how to fix it.  Now all calls to ->event() use a sane value for
time.

Increase timeout for commands handed to the BT driver from 2 seconds to 5
seconds.  This is necessary particularly when the previous command was a
"Clear SEL", as that command completes, yet the BMC isn't really ready to
handle another command yet.

Silence BT debugging messages which were being printed on the console.

Increase SMIC timeout form 1/10s to 2s.  This is needed on Dell PowerEdge 2650
and PowerEdge 750 with ERA/O cards to allow commands to complete without
timing out.

Adds kcs_debug module param, to match behavior of BT and SMIC.  This also
prevents messages from being sent to the console unless explicitly requested.

Signed-off-by: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 13 insertions, 21 deletions

diff --git a/drivers/char/ipmi/ipmi_bt_sm.c b/drivers/char/ipmi/ipmi_bt_sm.c
index 3386267..7c4a195 100644
--- a/drivers/char/ipmi/ipmi_bt_sm.c
+++ b/drivers/char/ipmi/ipmi_bt_sm.c
@@ -28,6 +28,8 @@
 
 #include <linux/kernel.h> /* For printk. */
 #include <linux/string.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/ipmi_msgdefs.h>		/* for completion codes */
 #include "ipmi_si_sm.h"
 
@@ -36,6 +38,8 @@ static int bt_debug = 0x00;	/* Production value 0, see following flags */
 #define	BT_DEBUG_ENABLE	1
 #define BT_DEBUG_MSG	2
 #define BT_DEBUG_STATES	4
+module_param(bt_debug, int, 0644);
+MODULE_PARM_DESC(bt_debug, "debug bitmask, 1=enable, 2=messages, 4=states");
 
 /* Typical "Get BT Capabilities" values are 2-3 retries, 5-10 seconds,
    and 64 byte buffers.  However, one HP implementation wants 255 bytes of
@@ -43,7 +47,7 @@ static int bt_debug = 0x00;	/* Production value 0, see following flags */
    Since the Open IPMI architecture is single-message oriented at this
    stage, the queue depth of BT is of no concern. */
 
-#define BT_NORMAL_TIMEOUT	2000000	/* seconds in microseconds */
+#define BT_NORMAL_TIMEOUT	5000000	/* seconds in microseconds */
 #define BT_RETRY_LIMIT		2
 #define BT_RESET_DELAY		6000000	/* 6 seconds after warm reset */
 
@@ -202,7 +206,7 @@ static int bt_get_result(struct si_sm_data *bt,
 	msg_len = bt->read_count - 2;		/* account for length & seq */
 	/* Always NetFn, Cmd, cCode */
 	if (msg_len < 3 || msg_len > IPMI_MAX_MSG_LENGTH) {
-		printk(KERN_WARNING "BT results: bad msg_len = %d\n", msg_len);
+		printk(KERN_DEBUG "BT results: bad msg_len = %d\n", msg_len);
 		data[0] = bt->write_data[1] | 0x4;	/* Kludge a response */
 		data[1] = bt->write_data[3];
 		data[2] = IPMI_ERR_UNSPECIFIED;
@@ -240,7 +244,7 @@ static void reset_flags(struct si_sm_data *bt)
 	       BT_CONTROL(BT_B_BUSY);
 	BT_CONTROL(BT_CLR_WR_PTR);
 	BT_CONTROL(BT_SMS_ATN);
-#ifdef DEVELOPMENT_ONLY_NOT_FOR_PRODUCTION
+
 	if (BT_STATUS & BT_B2H_ATN) {
 		int i;
 		BT_CONTROL(BT_H_BUSY);
@@ -250,7 +254,6 @@ static void reset_flags(struct si_sm_data *bt)
 		       BMC2HOST;
 		BT_CONTROL(BT_H_BUSY);
 	}
-#endif
 }
 
 static inline void write_all_bytes(struct si_sm_data *bt)
@@ -295,7 +298,7 @@ static inline int read_all_bytes(struct si_sm_data *bt)
 	    	printk ("\n");
 	}
 	if (bt->seq != bt->write_data[2])	/* idiot check */
-		printk(KERN_WARNING "BT: internal error: sequence mismatch\n");
+		printk(KERN_DEBUG "BT: internal error: sequence mismatch\n");
 
 	/* per the spec, the (NetFn, Seq, Cmd) tuples should match */
 	if ((bt->read_data[3] == bt->write_data[3]) &&		/* Cmd */
@@ -321,18 +324,18 @@ static void error_recovery(struct si_sm_data *bt, char *reason)
 	bt->timeout = BT_NORMAL_TIMEOUT; /* various places want to retry */
 
 	status = BT_STATUS;
-	printk(KERN_WARNING "BT: %s in %s %s ", reason, STATE2TXT,
+	printk(KERN_DEBUG "BT: %s in %s %s\n", reason, STATE2TXT,
 	       STATUS2TXT(buf));
 
 	(bt->error_retries)++;
 	if (bt->error_retries > BT_RETRY_LIMIT) {
-		printk("retry limit (%d) exceeded\n", BT_RETRY_LIMIT);
+		printk(KERN_DEBUG "retry limit (%d) exceeded\n", BT_RETRY_LIMIT);
 		bt->state = BT_STATE_HOSED;
 		if (!bt->nonzero_status)
 			printk(KERN_ERR "IPMI: BT stuck, try power cycle\n");
 		else if (bt->seq == FIRST_SEQ + BT_RETRY_LIMIT) {
 			/* most likely during insmod */
-			printk(KERN_WARNING "IPMI: BT reset (takes 5 secs)\n");
+			printk(KERN_DEBUG "IPMI: BT reset (takes 5 secs)\n");
         		bt->state = BT_STATE_RESET1;
 		}
 	return;
@@ -340,11 +343,11 @@ static void error_recovery(struct si_sm_data *bt, char *reason)
 
 	/* Sometimes the BMC queues get in an "off-by-one" state...*/
 	if ((bt->state == BT_STATE_B2H_WAIT) && (status & BT_B2H_ATN)) {
-    		printk("retry B2H_WAIT\n");
+    		printk(KERN_DEBUG "retry B2H_WAIT\n");
 		return;
 	}
 
-	printk("restart command\n");
+	printk(KERN_DEBUG "restart command\n");
 	bt->state = BT_STATE_RESTART;
 }
 
@@ -372,17 +375,6 @@ static enum si_sm_result bt_event(struct si_sm_data *bt, long time)
 	       return SI_SM_HOSED;
 
 	if (bt->state != BT_STATE_IDLE) {	/* do timeout test */
-
-		/* Certain states, on error conditions, can lock up a CPU
-		   because they are effectively in an infinite loop with
-		   CALL_WITHOUT_DELAY (right back here with time == 0).
-		   Prevent infinite lockup by ALWAYS decrementing timeout. */
-
-    	/* FIXME: bt_event is sometimes called with time > BT_NORMAL_TIMEOUT
-              (noticed in ipmi_smic_sm.c January 2004) */
-
-		if ((time <= 0) || (time >= BT_NORMAL_TIMEOUT))
-		       time = 100;
 		bt->timeout -= time;
 		if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1)) {
 			error_recovery(bt, "timed out");