[SCSI] zfcp: Only collect FSF/HBA debug data for matching trace levels

The default trace level is to only trace failed FSF commands. Thus it
is not necessary to collect trace data for most FSF commands, since
it will be thrown away later. Restructure the FSF/HBA trace
infrastructure to first check the trace level in a inline function and
only do the expensive data collection for matching trace levels.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 8 insertions, 36 deletions

diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index 61776d4..5568440 100644
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -120,14 +120,10 @@ static int zfcp_dbf_view_header(debug_info_t *id, struct debug_view *view,
 	return p - out_buf;
 }
 
-/**
- * zfcp_hba_dbf_event_fsf_response - trace event for request completion
- * @fsf_req: request that has been completed
- */
-void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
+void _zfcp_hba_dbf_event_fsf_response(const char *tag2, int level,
+				      struct zfcp_fsf_req *fsf_req,
+				      struct zfcp_dbf *dbf)
 {
-	struct zfcp_adapter *adapter = fsf_req->adapter;
-	struct zfcp_dbf *dbf = adapter->dbf;
 	struct fsf_qtcb *qtcb = fsf_req->qtcb;
 	union fsf_prot_status_qual *prot_status_qual =
 					&qtcb->prefix.prot_status_qual;
@@ -138,31 +134,12 @@ void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
 	struct zfcp_send_els *send_els;
 	struct zfcp_hba_dbf_record *rec = &dbf->hba_dbf_buf;
 	struct zfcp_hba_dbf_record_response *response = &rec->u.response;
-	int level;
 	unsigned long flags;
 
 	spin_lock_irqsave(&dbf->hba_dbf_lock, flags);
 	memset(rec, 0, sizeof(*rec));
 	strncpy(rec->tag, "resp", ZFCP_DBF_TAG_SIZE);
-
-	if ((qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
-	    (qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
-		strncpy(rec->tag2, "perr", ZFCP_DBF_TAG_SIZE);
-		level = 1;
-	} else if (qtcb->header.fsf_status != FSF_GOOD) {
-		strncpy(rec->tag2, "ferr", ZFCP_DBF_TAG_SIZE);
-		level = 1;
-	} else if ((fsf_req->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) ||
-		   (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;
-	}
+	strncpy(rec->tag2, tag2, ZFCP_DBF_TAG_SIZE);
 
 	response->fsf_command = fsf_req->fsf_command;
 	response->fsf_reqid = fsf_req->req_id;
@@ -241,14 +218,9 @@ void zfcp_hba_dbf_event_fsf_response(struct zfcp_fsf_req *fsf_req)
 	spin_unlock_irqrestore(&dbf->hba_dbf_lock, flags);
 }
 
-/**
- * zfcp_hba_dbf_event_fsf_unsol - trace event for an unsolicited status buffer
- * @tag: tag indicating which kind of unsolicited status has been received
- * @adapter: adapter that has issued the unsolicited status buffer
- * @status_buffer: buffer containing payload of unsolicited status
- */
-void zfcp_hba_dbf_event_fsf_unsol(const char *tag, struct zfcp_adapter *adapter,
-				  struct fsf_status_read_buffer *status_buffer)
+void _zfcp_hba_dbf_event_fsf_unsol(const char *tag, int level,
+				   struct zfcp_adapter *adapter,
+				   struct fsf_status_read_buffer *status_buffer)
 {
 	struct zfcp_dbf *dbf = adapter->dbf;
 	struct zfcp_hba_dbf_record *rec = &dbf->hba_dbf_buf;
@@ -296,7 +268,7 @@ void zfcp_hba_dbf_event_fsf_unsol(const char *tag, struct zfcp_adapter *adapter,
 		       &status_buffer->payload, rec->u.status.payload_size);
 	}
 
-	debug_event(dbf->hba_dbf, 2, rec, sizeof(*rec));
+	debug_event(dbf->hba_dbf, level, rec, sizeof(*rec));
 	spin_unlock_irqrestore(&dbf->hba_dbf_lock, flags);
 }