[SCSI] zfcp: Redesign of the debug tracing for recovery actions.

The tracing environment of the zfcp LLD has become very bulky and hard
to maintain. Small changes involve a large modification process which
is error-prone and not effective.  This patch is the first of a set to
redesign the zfcp tracing to a more straight-forward and easy to
extend scheme.  It removes all interpretation and visualization parts
and focuses on bare logging of the information.

This patch deals with all trace records of the zfcp error recovery.

Signed-off-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, 58 insertions, 42 deletions

diff --git a/drivers/s390/scsi/zfcp_dbf.h b/drivers/s390/scsi/zfcp_dbf.h
index 04081b1b62b4..2e823d4ede6e 100644
--- a/drivers/s390/scsi/zfcp_dbf.h
+++ b/drivers/s390/scsi/zfcp_dbf.h
@@ -27,6 +27,7 @@
 #include "zfcp_fsf.h"
 #include "zfcp_def.h"
 
+#define ZFCP_DBF_TAG_LEN       7
 #define ZFCP_DBF_TAG_SIZE      4
 #define ZFCP_DBF_ID_SIZE       7
 
@@ -40,57 +41,72 @@ struct zfcp_dbf_dump {
 	u8 data[];		/* dump data */
 } __attribute__ ((packed));
 
-struct zfcp_dbf_rec_record_thread {
-	u32 total;
+/**
+ * struct zfcp_dbf_rec_trigger - trace record for triggered recovery action
+ * @ready: number of ready recovery actions
+ * @running: number of running recovery actions
+ * @want: wanted recovery action
+ * @need: needed recovery action
+ */
+struct zfcp_dbf_rec_trigger {
 	u32 ready;
 	u32 running;
-};
-
-struct zfcp_dbf_rec_record_target {
-	u64 ref;
-	u32 status;
-	u32 d_id;
-	u64 wwpn;
-	u64 fcp_lun;
-	u32 erp_count;
-};
-
-struct zfcp_dbf_rec_record_trigger {
 	u8 want;
 	u8 need;
-	u32 as;
-	u32 ps;
-	u32 ls;
-	u64 ref;
-	u64 action;
-	u64 wwpn;
-	u64 fcp_lun;
-};
+} __packed;
+
+/**
+ * struct zfcp_dbf_rec_running - trace record for running recovery
+ * @fsf_req_id: request id for fsf requests
+ * @rec_status: status of the fsf request
+ * @rec_step: current step of the recovery action
+ * rec_count: recovery counter
+ */
+struct zfcp_dbf_rec_running {
+	u64 fsf_req_id;
+	u32 rec_status;
+	u16 rec_step;
+	u8 rec_action;
+	u8 rec_count;
+} __packed;
 
-struct zfcp_dbf_rec_record_action {
-	u32 status;
-	u32 step;
-	u64 action;
-	u64 fsf_req;
+/**
+ * enum zfcp_dbf_rec_id - recovery trace record id
+ * @ZFCP_DBF_REC_TRIG: triggered recovery identifier
+ * @ZFCP_DBF_REC_RUN: running recovery identifier
+ */
+enum zfcp_dbf_rec_id {
+	ZFCP_DBF_REC_TRIG	= 1,
+	ZFCP_DBF_REC_RUN	= 2,
 };
 
-struct zfcp_dbf_rec_record {
+/**
+ * struct zfcp_dbf_rec - trace record for error recovery actions
+ * @id: unique number of recovery record type
+ * @tag: identifier string specifying the location of initiation
+ * @lun: logical unit number
+ * @wwpn: word wide port number
+ * @d_id: destination ID
+ * @adapter_status: current status of the adapter
+ * @port_status: current status of the port
+ * @lun_status: current status of the lun
+ * @u.trig: structure zfcp_dbf_rec_trigger
+ * @u.run: structure zfcp_dbf_rec_running
+ */
+struct zfcp_dbf_rec {
 	u8 id;
-	char id2[7];
+	char tag[ZFCP_DBF_TAG_LEN];
+	u64 lun;
+	u64 wwpn;
+	u32 d_id;
+	u32 adapter_status;
+	u32 port_status;
+	u32 lun_status;
 	union {
-		struct zfcp_dbf_rec_record_action action;
-		struct zfcp_dbf_rec_record_thread thread;
-		struct zfcp_dbf_rec_record_target target;
-		struct zfcp_dbf_rec_record_trigger trigger;
+		struct zfcp_dbf_rec_trigger trig;
+		struct zfcp_dbf_rec_running run;
 	} u;
-};
-
-enum {
-	ZFCP_REC_DBF_ID_ACTION,
-	ZFCP_REC_DBF_ID_THREAD,
-	ZFCP_REC_DBF_ID_TARGET,
-	ZFCP_REC_DBF_ID_TRIGGER,
-};
+} __packed;
 
 struct zfcp_dbf_hba_record_response {
 	u32 fsf_command;
@@ -232,7 +248,7 @@ struct zfcp_dbf {
 	spinlock_t			hba_lock;
 	spinlock_t			san_lock;
 	spinlock_t			scsi_lock;
-	struct zfcp_dbf_rec_record	rec_buf;
+	struct zfcp_dbf_rec		rec_buf;
 	struct zfcp_dbf_hba_record	hba_buf;
 	struct zfcp_dbf_san_record	san_buf;
 	struct zfcp_dbf_scsi_record	scsi_buf;