[PATCH 3.16 013/306] zfcp: trace on request for open and close of WKA port

[Ben Hutchings]

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Steffen Maier <ma...@linux.vnet.ibm.com>

commit d27a7cb91960cf1fdd11b10071e601828cbf4b1f upstream.

Since commit a54ca0f62f953898b05549391ac2a8a4dad6482b
("[SCSI] zfcp: Redesign of the debug tracing for HBA records.")
HBA records no longer contain WWPN, D_ID, or LUN
to reduce duplicate information which is already in REC records.
In contrast to "regular" target ports, we don't use recovery to open
WKA ports such as directory/nameserver, so we don't get REC records.
Therefore, introduce pseudo REC running records without any
actual recovery action but including D_ID of WKA port on open/close.

Signed-off-by: Steffen Maier <ma...@linux.vnet.ibm.com>
Fixes: a54ca0f62f95 ("[SCSI] zfcp: Redesign of the debug tracing for HBA 
records.")
Reviewed-by: Benjamin Block <bbl...@linux.vnet.ibm.com>
Reviewed-by: Hannes Reinecke <h...@suse.com>
Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/s390/scsi/zfcp_dbf.c | 32 ++++++++++++++++++++++++++++++++
 drivers/s390/scsi/zfcp_ext.h |  1 +
 drivers/s390/scsi/zfcp_fsf.c |  8 ++++++--
 3 files changed, 39 insertions(+), 2 deletions(-)

--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -321,6 +321,38 @@ void zfcp_dbf_rec_run(char *tag, struct
        spin_unlock_irqrestore(&dbf->rec_lock, flags);
 }
 
+/**
+ * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery
+ * @tag: identifier for event
+ * @wka_port: well known address port
+ * @req_id: request ID to correlate with potential HBA trace record
+ */
+void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
+                         u64 req_id)
+{
+       struct zfcp_dbf *dbf = wka_port->adapter->dbf;
+       struct zfcp_dbf_rec *rec = &dbf->rec_buf;
+       unsigned long flags;
+
+       spin_lock_irqsave(&dbf->rec_lock, flags);
+       memset(rec, 0, sizeof(*rec));
+
+       rec->id = ZFCP_DBF_REC_RUN;
+       memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+       rec->port_status = wka_port->status;
+       rec->d_id = wka_port->d_id;
+       rec->lun = ZFCP_DBF_INVALID_LUN;
+
+       rec->u.run.fsf_req_id = req_id;
+       rec->u.run.rec_status = ~0;
+       rec->u.run.rec_step = ~0;
+       rec->u.run.rec_action = ~0;
+       rec->u.run.rec_count = ~0;
+
+       debug_event(dbf->rec, 1, rec, sizeof(*rec));
+       spin_unlock_irqrestore(&dbf->rec_lock, flags);
+}
+
 static inline
 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
                  u64 req_id, u32 d_id)
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -35,6 +35,7 @@ extern void zfcp_dbf_adapter_unregister(
 extern void zfcp_dbf_rec_trig(char *, struct zfcp_adapter *,
                              struct zfcp_port *, struct scsi_device *, u8, u8);
 extern void zfcp_dbf_rec_run(char *, struct zfcp_erp_action *);
+extern void zfcp_dbf_rec_run_wka(char *, struct zfcp_fc_wka_port *, u64);
 extern void zfcp_dbf_hba_fsf_uss(char *, struct zfcp_fsf_req *);
 extern void zfcp_dbf_hba_fsf_res(char *, int, struct zfcp_fsf_req *);
 extern void zfcp_dbf_hba_bit_err(char *, struct zfcp_fsf_req *);
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -1582,7 +1582,7 @@ out:
 int zfcp_fsf_open_wka_port(struct zfcp_fc_wka_port *wka_port)
 {
        struct zfcp_qdio *qdio = wka_port->adapter->qdio;
-       struct zfcp_fsf_req *req;
+       struct zfcp_fsf_req *req = NULL;
        int retval = -EIO;
 
        spin_lock_irq(&qdio->req_q_lock);
@@ -1611,6 +1611,8 @@ int zfcp_fsf_open_wka_port(struct zfcp_f
                zfcp_fsf_req_free(req);
 out:
        spin_unlock_irq(&qdio->req_q_lock);
+       if (req && !IS_ERR(req))
+               zfcp_dbf_rec_run_wka("fsowp_1", wka_port, req->req_id);
        return retval;
 }
 
@@ -1635,7 +1637,7 @@ static void zfcp_fsf_close_wka_port_hand
 int zfcp_fsf_close_wka_port(struct zfcp_fc_wka_port *wka_port)
 {
        struct zfcp_qdio *qdio = wka_port->adapter->qdio;
-       struct zfcp_fsf_req *req;
+       struct zfcp_fsf_req *req = NULL;
        int retval = -EIO;
 
        spin_lock_irq(&qdio->req_q_lock);
@@ -1664,6 +1666,8 @@ int zfcp_fsf_close_wka_port(struct zfcp_
                zfcp_fsf_req_free(req);
 out:
        spin_unlock_irq(&qdio->req_q_lock);
+       if (req && !IS_ERR(req))
+               zfcp_dbf_rec_run_wka("fscwp_1", wka_port, req->req_id);
        return retval;
 }