From b75db73159ccffaf60a67896fdfed3856b1f65e3 Mon Sep 17 00:00:00 2001
From: Martin Peschke <mp3@de.ibm.com>
Date: Thu, 27 Mar 2008 14:21:58 +0100
Subject: [PATCH] [SCSI] zfcp: Add qtcb dump to hba debug trace
This patch adds per request hardware debugging data to the trace
record which is written per request. It's a replacement for some sad
kernel message based debugging code. Considering the amount of trace
data, printk() is not suitable for this stuff. Writing binary traces
is more efficient. In addition we got all information in one place.
The QTCB trace data is only dumped for requests other than SCSI
requests. Otherwise we would flood the trace ring buffer. We are
mostly interested in non-SCSI, recovery related requests here anyway.
This patch also works around a known hardware bug. It truncates QTCB
traces so that we do not save unused areas of the hardware trace.
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---
drivers/s390/scsi/zfcp_dbf.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index 5019d7b738bc..658053c74707 100644
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -179,6 +179,9 @@ void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
(fsf_req->fsf_command == FSF_QTCB_OPEN_LUN)) {
strncpy(rec->tag2, "open", ZFCP_DBF_TAG_SIZE);
level = 4;
+ } else if (qtcb->header.log_length) {
+ strncpy(rec->tag2, "qtcb", ZFCP_DBF_TAG_SIZE);
+ level = 5;
} else {
strncpy(rec->tag2, "norm", ZFCP_DBF_TAG_SIZE);
level = 6;
@@ -250,6 +253,17 @@ void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
debug_event(adapter->hba_dbf, level,
rec, sizeof(struct zfcp_hba_dbf_record));
+
+ /* have fcp channel microcode fixed to use as little as possible */
+ if (fsf_req->fsf_command != FSF_QTCB_FCP_CMND) {
+ /* adjust length skipping trailing zeros */
+ char *buf = (char *)qtcb + qtcb->header.log_start;
+ int len = qtcb->header.log_length;
+ for (; len && !buf[len - 1]; len--);
+ zfcp_dbf_hexdump(adapter->hba_dbf, rec, sizeof(*rec), level,
+ buf, len);
+ }
+
spin_unlock_irqrestore(&adapter->hba_dbf_lock, flags);
}