diff --git a/drivers/s390/scsi/zfcp_dbf.c b/drivers/s390/scsi/zfcp_dbf.c
index 71f625926ae1..81fb8af408e9 100644
--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -4,7 +4,7 @@
  *
  * Debug traces for zfcp.
  *
- * Copyright IBM Corp. 2002, 2023
+ * Copyright IBM Corp. 2002, 2026
  */
 
 #define pr_fmt(fmt) "zfcp: " fmt
@@ -35,13 +35,18 @@ static inline unsigned int zfcp_dbf_plen(unsigned int offset)
 	return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
 }
 
+#define ZFCP_DBF_PAY_LEVEL 1
+
 static inline
 void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
-		       u64 req_id)
+		       u64 req_id, int level)
 {
 	struct zfcp_dbf_pay *pl = &dbf->pay_buf;
 	u16 offset = 0, rec_length;
 
+	if (unlikely(!debug_level_enabled(dbf->pay, level)))
+		return;
+
 	spin_lock(&dbf->pay_lock);
 	memset(pl, 0, sizeof(*pl));
 	pl->fsf_req_id = req_id;
@@ -51,7 +56,7 @@ void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
 		rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
 				 (u16) (length - offset));
 		memcpy(pl->data, data + offset, rec_length);
-		debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
+		debug_event(dbf->pay, level, pl, zfcp_dbf_plen(rec_length));
 
 		offset += rec_length;
 		pl->counter++;
@@ -96,7 +101,27 @@ void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req)
 
 	rec->pl_len = q_head->log_length;
 	zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
-			  rec->pl_len, "fsf_res", req->req_id);
+			  rec->pl_len, "fsf_res", req->req_id,
+			  ZFCP_DBF_PAY_LEVEL);
+
+	if (q_head->fsf_command == FSF_QTCB_OPEN_PORT_WITH_DID) {
+		struct fsf_qtcb_bottom_support *q_bott =
+			&req->qtcb->bottom.support;
+		u32 plogi_len = 0, prli_len = 0;
+
+		if (q_bott->els1_length) {
+			rec->u.res.plogi_len = q_bott->els1_length;
+			plogi_len = min_t(u32, q_bott->els1_length,
+					  sizeof(q_bott->els));
+		}
+		if (q_bott->els2_length) {
+			rec->u.res.prli_len = q_bott->els2_length;
+			prli_len = min_t(u32, q_bott->els2_length,
+					 sizeof(q_bott->els) - plogi_len);
+		}
+		zfcp_dbf_pl_write(dbf, q_bott->els, plogi_len + prli_len,
+				  "fsf_els", req->req_id, 4);
+	}
 
 	debug_event(dbf->hba, level, rec, sizeof(*rec));
 	spin_unlock_irqrestore(&dbf->hba_lock, flags);
@@ -220,6 +245,13 @@ void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
 	rec->u.uss.lun = srb->fcp_lun;
 	memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
 	       sizeof(rec->u.uss.queue_designator));
+	rec->u.uss.length = srb->length;
+	rec->u.uss.res1 = srb->res1;
+	rec->u.uss.res2 = srb->res2;
+	rec->u.uss.class = srb->class;
+	rec->u.uss.res3 = srb->res3;
+	rec->u.uss.s_id = ntoh24(srb->s_id);
+	memcpy(&rec->u.uss.res4, &srb->res4, sizeof(rec->u.uss.res4));
 
 	/* status read buffer payload length */
 	rec->pl_len = (!srb->length) ? 0 : srb->length -
@@ -227,12 +259,48 @@ void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
 
 	if (rec->pl_len)
 		zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
-				  "fsf_uss", req->req_id);
+				  "fsf_uss", req->req_id, ZFCP_DBF_PAY_LEVEL);
 log:
 	debug_event(dbf->hba, level, rec, sizeof(*rec));
 	spin_unlock_irqrestore(&dbf->hba_lock, flags);
 }
 
+/**
+ * zfcp_dbf_hba_uas - trace event for sysfs unit add store
+ * @tag: tag indicating which kind of unit add store condition occurred
+ * @level: debug trace level
+ * @adapter: pointer to struct zfcp_adapter
+ * @wwpn: remote port wwn
+ * @fcp_lun: FCP LUN
+ * @ret: return value
+ */
+void zfcp_dbf_hba_uas(char *tag, int level, struct zfcp_adapter *adapter,
+		      u64 wwpn, u64 fcp_lun, int ret)
+{
+	struct zfcp_dbf *dbf = adapter->dbf;
+	struct zfcp_dbf_hba *rec = &dbf->hba_buf;
+	unsigned long flags;
+
+	if (unlikely(!debug_level_enabled(dbf->hba, level)))
+		return;
+
+	spin_lock_irqsave(&dbf->hba_lock, flags);
+	memset(rec, 0, sizeof(*rec));
+
+	memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
+	rec->id = ZFCP_DBF_HBA_UAS;
+	rec->fsf_req_id = ~0u;
+	rec->fsf_req_status = ~0u;
+	rec->fsf_cmd = ~0u;
+	rec->fsf_seq_no = ~0u;
+	rec->u.uas.wwpn = wwpn;
+	rec->u.uas.fcp_lun = fcp_lun;
+	rec->u.uas.ret = ret;
+
+	debug_event(dbf->hba, level, rec, sizeof(*rec));
+	spin_unlock_irqrestore(&dbf->hba_lock, flags);
+}
+
 /**
  * zfcp_dbf_hba_bit_err - trace event for bit error conditions
  * @tag: tag indicating which kind of bit error unsolicited status was received
@@ -732,7 +800,7 @@ void zfcp_dbf_scsi_common(char *tag, int level, struct scsi_device *sdev,
 				min_t(u16, max_t(u16, rec->pl_len,
 						 ZFCP_DBF_PAY_MAX_REC),
 				      FSF_FCP_RSP_SIZE),
-				"fcp_riu", fsf->req_id);
+				"fcp_riu", fsf->req_id, ZFCP_DBF_PAY_LEVEL);
 	}
 
 	debug_event(dbf->scsi, level, rec, sizeof(*rec));
diff --git a/drivers/s390/scsi/zfcp_dbf.h b/drivers/s390/scsi/zfcp_dbf.h
index 4d1435c573bc..79973fb24b1c 100644
--- a/drivers/s390/scsi/zfcp_dbf.h
+++ b/drivers/s390/scsi/zfcp_dbf.h
@@ -3,7 +3,7 @@
  * zfcp device driver
  * debug feature declarations
  *
- * Copyright IBM Corp. 2008, 2020
+ * Copyright IBM Corp. 2008, 2026
  */
 
 #ifndef ZFCP_DBF_H
@@ -140,6 +140,8 @@ struct zfcp_dbf_hba_res {
 	u8  fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
 	u32 port_handle;
 	u32 lun_handle;
+	u32 plogi_len;
+	u32 prli_len;
 } __packed;
 
 /**
@@ -149,6 +151,13 @@ struct zfcp_dbf_hba_res {
  * @d_id: destination ID
  * @lun: logical unit number
  * @queue_designator: queue designator
+ * @length: buffer length
+ * @res1: reserved field 1
+ * @res2: reserved field 2
+ * @class: class of service
+ * @res3: reserved field 3
+ * @s_id: source ID
+ * @res4: reserved field 4
  */
 struct zfcp_dbf_hba_uss {
 	u32 status_type;
@@ -156,6 +165,25 @@ struct zfcp_dbf_hba_uss {
 	u32 d_id;
 	u64 lun;
 	u64 queue_designator;
+	u32 length;
+	u32 res1;
+	u8 res2;
+	u32 class;
+	u8 res3;
+	u32 s_id;
+	u8 res4[20];
+} __packed;
+
+/**
+ * struct zfcp_dbf_hba_uas - trace record for sysfs unit add store
+ * @wwpn: remote port wwn
+ * @fcp_lun: FCP LUN
+ * @ret: return value
+ */
+struct zfcp_dbf_hba_uas {
+	u64 wwpn;
+	u64 fcp_lun;
+	u32 ret;
 } __packed;
 
 /**
@@ -184,6 +212,7 @@ struct zfcp_dbf_hba_fces {
  * @ZFCP_DBF_HBA_BIT: bit error trace record
  * @ZFCP_DBF_HBA_BASIC: basic adapter event, only trace tag, no other data
  * @ZFCP_DBF_HBA_FCES: FC Endpoint Security trace record
+ * @ZFCP_DBF_HBA_UAS: unit add store trace record
  */
 enum zfcp_dbf_hba_id {
 	ZFCP_DBF_HBA_RES	= 1,
@@ -191,6 +220,7 @@ enum zfcp_dbf_hba_id {
 	ZFCP_DBF_HBA_BIT	= 3,
 	ZFCP_DBF_HBA_BASIC	= 4,
 	ZFCP_DBF_HBA_FCES	= 5,
+	ZFCP_DBF_HBA_UAS        = 6,
 };
 
 /**
@@ -207,6 +237,7 @@ enum zfcp_dbf_hba_id {
  * @u.uss:  data for unsolicited status buffer
  * @u.be:   data for bit error unsolicited status buffer
  * @u.fces: data for FC Endpoint Security
+ * @u.uas:  data for unit add store
  */
 struct zfcp_dbf_hba {
 	u8 id;
@@ -221,6 +252,7 @@ struct zfcp_dbf_hba {
 		struct zfcp_dbf_hba_uss uss;
 		struct fsf_bit_error_payload be;
 		struct zfcp_dbf_hba_fces fces;
+		struct zfcp_dbf_hba_uas uas;
 	} u;
 } __packed;
 
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index 9f5152b42b0e..40bd597fb4cd 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -4,7 +4,7 @@
  *
  * External function declarations.
  *
- * Copyright IBM Corp. 2002, 2023
+ * Copyright IBM Corp. 2002, 2026
  */
 
 #ifndef ZFCP_EXT_H
@@ -49,6 +49,8 @@ extern void zfcp_dbf_hba_fsf_fces(char *tag, const struct zfcp_fsf_req *req,
 extern void zfcp_dbf_hba_fsf_reqid(const char *const tag, const int level,
 				   struct zfcp_adapter *const adapter,
 				   const u64 req_id);
+extern void zfcp_dbf_hba_uas(char *tag, int level, struct zfcp_adapter *adapter,
+			     u64 wwpn, u64 fcp_lun, int ret);
 extern void zfcp_dbf_hba_bit_err(char *, struct zfcp_fsf_req *);
 extern void zfcp_dbf_hba_def_err(struct zfcp_adapter *, u64, u16, void **);
 extern void zfcp_dbf_san_req(char *, struct zfcp_fsf_req *, u32);
diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h
index 5e6b601af980..4b92e85ec71d 100644
--- a/drivers/s390/scsi/zfcp_fsf.h
+++ b/drivers/s390/scsi/zfcp_fsf.h
@@ -246,7 +246,9 @@ struct fsf_status_read_buffer {
 	u8 d_id[3];
 	u32 class;
 	u64 fcp_lun;
-	u8  res3[24];
+	u8 res3;
+	u8 s_id[3];
+	u8 res4[20];
 	union {
 		u8  data[FSF_STATUS_READ_PAYLOAD_SIZE];
 		u32 word[FSF_STATUS_READ_PAYLOAD_SIZE/sizeof(u32)];
diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index 42423549e511..4f23d585d062 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -4,7 +4,7 @@
  *
  * sysfs attributes.
  *
- * Copyright IBM Corp. 2008, 2020
+ * Copyright IBM Corp. 2008, 2026
  */
 
 #define pr_fmt(fmt) "zfcp: " fmt
@@ -442,17 +442,24 @@ static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
 					 const char *buf, size_t count)
 {
 	struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
-	u64 fcp_lun;
-	int retval;
+	struct zfcp_adapter *adapter = port->adapter;
+	u64 fcp_lun = 0;
+	int retval = -EINVAL;
 
-	if (kstrtoull(buf, 0, (unsigned long long *) &fcp_lun))
-		return -EINVAL;
+	if (kstrtoull(buf, 0, (unsigned long long *)&fcp_lun)) {
+		zfcp_dbf_hba_uas("syuast1", 3, adapter, port->wwpn,
+				 fcp_lun, retval);
+		return retval;
+	}
 
 	flush_work(&port->rport_work);
 
 	retval = zfcp_unit_add(port, fcp_lun);
-	if (retval)
+	if (retval) {
+		zfcp_dbf_hba_uas("syuast2", 3, adapter, port->wwpn,
+				 fcp_lun, retval);
 		return retval;
+	}
 
 	return count;
 }