[SCSI] zfcp: enhancement of zfcp debug features

Debug features (DBFs) els_dbf, cmd_dbf and abt_dbf were removed and
san_dbf, hba_dbf and scsi_dbf were introduced. The erp_dbf did not
change.
The new traces improve debugging of problems with zfcp, scsi-stack,
multipath and hardware in the SAN. san_dbf traces things like ELS and
CT commands, hba_dbf saves HBA specific information of requests, and
scsi_dbf saves FCP and SCSI specific information of requests. Common
to all new DBFs is that they provide a so called structured view. This
significantly improves readability of the traces.

Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 1 insertions, 179 deletions

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 17f9989238f..0b5087f7cab 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -122,93 +122,6 @@ _zfcp_hex_dump(char *addr, int count)
 
 #define ZFCP_LOG_AREA			ZFCP_LOG_AREA_OTHER
 
-static inline int
-zfcp_fsf_req_is_scsi_cmnd(struct zfcp_fsf_req *fsf_req)
-{
-	return ((fsf_req->fsf_command == FSF_QTCB_FCP_CMND) &&
-		!(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT));
-}
-
-void
-zfcp_cmd_dbf_event_fsf(const char *text, struct zfcp_fsf_req *fsf_req,
-		       void *add_data, int add_length)
-{
-	struct zfcp_adapter *adapter = fsf_req->adapter;
-	struct scsi_cmnd *scsi_cmnd;
-	int level = 3;
-	int i;
-	unsigned long flags;
-
-	spin_lock_irqsave(&adapter->dbf_lock, flags);
-	if (zfcp_fsf_req_is_scsi_cmnd(fsf_req)) {
-		scsi_cmnd = (struct scsi_cmnd*) fsf_req->data;
-		debug_text_event(adapter->cmd_dbf, level, "fsferror");
-		debug_text_event(adapter->cmd_dbf, level, text);
-		debug_event(adapter->cmd_dbf, level, &fsf_req,
-			    sizeof (unsigned long));
-		debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
-			    sizeof (u32));
-		debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
-			    sizeof (unsigned long));
-		debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
-			    min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
-		for (i = 0; i < add_length; i += ZFCP_CMD_DBF_LENGTH)
-			debug_event(adapter->cmd_dbf,
-				    level,
-				    (char *) add_data + i,
-				    min(ZFCP_CMD_DBF_LENGTH, add_length - i));
-	}
-	spin_unlock_irqrestore(&adapter->dbf_lock, flags);
-}
-
-/* XXX additionally log unit if available */
-/* ---> introduce new parameter for unit, see 2.4 code */
-void
-zfcp_cmd_dbf_event_scsi(const char *text, struct scsi_cmnd *scsi_cmnd)
-{
-	struct zfcp_adapter *adapter;
-	struct zfcp_fsf_req *fsf_req;
-	int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
-	unsigned long flags;
-
-	adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
-	fsf_req = (struct zfcp_fsf_req  *) scsi_cmnd->host_scribble;
-	spin_lock_irqsave(&adapter->dbf_lock, flags);
-	debug_text_event(adapter->cmd_dbf, level, "hostbyte");
-	debug_text_event(adapter->cmd_dbf, level, text);
-	debug_event(adapter->cmd_dbf, level, &scsi_cmnd->result, sizeof (u32));
-	debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
-		    sizeof (unsigned long));
-	debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
-		    min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
-	if (likely(fsf_req)) {
-		debug_event(adapter->cmd_dbf, level, &fsf_req,
-			    sizeof (unsigned long));
-		debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
-			    sizeof (u32));
-	} else {
-		debug_text_event(adapter->cmd_dbf, level, "");
-		debug_text_event(adapter->cmd_dbf, level, "");
-	}
-	spin_unlock_irqrestore(&adapter->dbf_lock, flags);
-}
-
-void
-zfcp_in_els_dbf_event(struct zfcp_adapter *adapter, const char *text,
-		      struct fsf_status_read_buffer *status_buffer, int length)
-{
-	int level = 1;
-	int i;
-
-	debug_text_event(adapter->in_els_dbf, level, text);
-	debug_event(adapter->in_els_dbf, level, &status_buffer->d_id, 8);
-	for (i = 0; i < length; i += ZFCP_IN_ELS_DBF_LENGTH)
-		debug_event(adapter->in_els_dbf,
-			    level,
-			    (char *) status_buffer->payload + i,
-			    min(ZFCP_IN_ELS_DBF_LENGTH, length - i));
-}
-
 /**
  * zfcp_device_setup - setup function
  * @str: pointer to parameter string
@@ -1015,81 +928,6 @@ zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
 		mempool_destroy(adapter->pool.data_gid_pn);
 }
 
-/**
- * zfcp_adapter_debug_register - registers debug feature for an adapter
- * @adapter: pointer to adapter for which debug features should be registered
- * return: -ENOMEM on error, 0 otherwise
- */
-int
-zfcp_adapter_debug_register(struct zfcp_adapter *adapter)
-{
-	char dbf_name[20];
-
-	/* debug feature area which records SCSI command failures (hostbyte) */
-	spin_lock_init(&adapter->dbf_lock);
-
-	sprintf(dbf_name, ZFCP_CMD_DBF_NAME "%s",
-		zfcp_get_busid_by_adapter(adapter));
-	adapter->cmd_dbf = debug_register(dbf_name, ZFCP_CMD_DBF_INDEX,
-					  ZFCP_CMD_DBF_AREAS,
-					  ZFCP_CMD_DBF_LENGTH);
-	debug_register_view(adapter->cmd_dbf, &debug_hex_ascii_view);
-	debug_set_level(adapter->cmd_dbf, ZFCP_CMD_DBF_LEVEL);
-
-	/* debug feature area which records SCSI command aborts */
-	sprintf(dbf_name, ZFCP_ABORT_DBF_NAME "%s",
-		zfcp_get_busid_by_adapter(adapter));
-	adapter->abort_dbf = debug_register(dbf_name, ZFCP_ABORT_DBF_INDEX,
-					    ZFCP_ABORT_DBF_AREAS,
-					    ZFCP_ABORT_DBF_LENGTH);
-	debug_register_view(adapter->abort_dbf, &debug_hex_ascii_view);
-	debug_set_level(adapter->abort_dbf, ZFCP_ABORT_DBF_LEVEL);
-
-	/* debug feature area which records incoming ELS commands */
-	sprintf(dbf_name, ZFCP_IN_ELS_DBF_NAME "%s",
-		zfcp_get_busid_by_adapter(adapter));
-	adapter->in_els_dbf = debug_register(dbf_name, ZFCP_IN_ELS_DBF_INDEX,
-					     ZFCP_IN_ELS_DBF_AREAS,
-					     ZFCP_IN_ELS_DBF_LENGTH);
-	debug_register_view(adapter->in_els_dbf, &debug_hex_ascii_view);
-	debug_set_level(adapter->in_els_dbf, ZFCP_IN_ELS_DBF_LEVEL);
-
-	/* debug feature area which records erp events */
-	sprintf(dbf_name, ZFCP_ERP_DBF_NAME "%s",
-		zfcp_get_busid_by_adapter(adapter));
-	adapter->erp_dbf = debug_register(dbf_name, ZFCP_ERP_DBF_INDEX,
-					  ZFCP_ERP_DBF_AREAS,
-					  ZFCP_ERP_DBF_LENGTH);
-	debug_register_view(adapter->erp_dbf, &debug_hex_ascii_view);
-	debug_set_level(adapter->erp_dbf, ZFCP_ERP_DBF_LEVEL);
-
-	if (!(adapter->cmd_dbf && adapter->abort_dbf &&
-	      adapter->in_els_dbf && adapter->erp_dbf)) {
-		zfcp_adapter_debug_unregister(adapter);
-		return -ENOMEM;
-	}
-
-	return 0;
-
-}
-
-/**
- * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
- * @adapter: pointer to adapter for which debug features should be unregistered
- */
-void
-zfcp_adapter_debug_unregister(struct zfcp_adapter *adapter)
-{
- 	debug_unregister(adapter->abort_dbf);
- 	debug_unregister(adapter->cmd_dbf);
- 	debug_unregister(adapter->erp_dbf);
- 	debug_unregister(adapter->in_els_dbf);
-	adapter->abort_dbf = NULL;
-	adapter->cmd_dbf = NULL;
-	adapter->erp_dbf = NULL;
-	adapter->in_els_dbf = NULL;
-}
-
 void
 zfcp_dummy_release(struct device *dev)
 {
@@ -1460,10 +1298,6 @@ zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
 	/* see FC-FS */
 	no_entries = (fcp_rscn_head->payload_len / 4);
 
-	zfcp_in_els_dbf_event(adapter, "##rscn", status_buffer,
-			      fcp_rscn_head->payload_len);
-
-	debug_text_event(adapter->erp_dbf, 1, "unsol_els_rscn:");
 	for (i = 1; i < no_entries; i++) {
 		/* skip head and start with 1st element */
 		fcp_rscn_element++;
@@ -1495,8 +1329,6 @@ zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
 			    (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
 				ZFCP_LOG_INFO("incoming RSCN, trying to open "
 					      "port 0x%016Lx\n", port->wwpn);
-				debug_text_event(adapter->erp_dbf, 1,
-						 "unsol_els_rscnu:");
 				zfcp_erp_port_reopen(port,
 						     ZFCP_STATUS_COMMON_ERP_FAILED);
 				continue;
@@ -1522,8 +1354,6 @@ zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
 				 */
 				ZFCP_LOG_INFO("incoming RSCN, trying to open "
 					      "port 0x%016Lx\n", port->wwpn);
-				debug_text_event(adapter->erp_dbf, 1,
-						 "unsol_els_rscnk:");
 				zfcp_test_link(port);
 			}
 		}
@@ -1539,8 +1369,6 @@ zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
 	struct zfcp_port *port;
 	unsigned long flags;
 
-	zfcp_in_els_dbf_event(adapter, "##plogi", status_buffer, 28);
-
 	read_lock_irqsave(&zfcp_data.config_lock, flags);
 	list_for_each_entry(port, &adapter->port_list_head, list) {
 		if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
@@ -1554,8 +1382,6 @@ zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
 			       status_buffer->d_id,
 			       zfcp_get_busid_by_adapter(adapter));
 	} else {
-		debug_text_event(adapter->erp_dbf, 1, "unsol_els_plogi:");
-		debug_event(adapter->erp_dbf, 1, &els_logi->nport_wwn, 8);
 		zfcp_erp_port_forced_reopen(port, 0);
 	}
 }
@@ -1568,8 +1394,6 @@ zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
 	struct zfcp_port *port;
 	unsigned long flags;
 
-	zfcp_in_els_dbf_event(adapter, "##logo", status_buffer, 16);
-
 	read_lock_irqsave(&zfcp_data.config_lock, flags);
 	list_for_each_entry(port, &adapter->port_list_head, list) {
 		if (port->wwpn == els_logo->nport_wwpn)
@@ -1583,8 +1407,6 @@ zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
 			       status_buffer->d_id,
 			       zfcp_get_busid_by_adapter(adapter));
 	} else {
-		debug_text_event(adapter->erp_dbf, 1, "unsol_els_logo:");
-		debug_event(adapter->erp_dbf, 1, &els_logo->nport_wwpn, 8);
 		zfcp_erp_port_forced_reopen(port, 0);
 	}
 }
@@ -1593,7 +1415,6 @@ static void
 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
 			      struct fsf_status_read_buffer *status_buffer)
 {
-	zfcp_in_els_dbf_event(adapter, "##undef", status_buffer, 24);
 	ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
 			"for adapter %s\n", *(u32 *) (status_buffer->payload),
 			zfcp_get_busid_by_adapter(adapter));
@@ -1611,6 +1432,7 @@ zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
 	els_type = *(u32 *) (status_buffer->payload);
 	adapter = fsf_req->adapter;
 
+	zfcp_san_dbf_event_incoming_els(fsf_req);
 	if (els_type == LS_PLOGI)
 		zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
 	else if (els_type == LS_LOGO)