diff mbox series

[v3,4/6] scsi: ufs: Distinguish between query REQ and query RSP in query trace

Message ID 20201214202014.13835-5-huobean@gmail.com
State Superseded
Headers show
Series Several changes for the UPIU trace | expand

Commit Message

Bean Huo Dec. 14, 2020, 8:20 p.m. UTC 
From: Bean Huo <beanhuo@micron.com>

Currently, in the query completion trace print,  since we use
hba->lrb[tag].ucd_req_ptr and didn't differentiate UPIU between
request and response, thus header and transaction-specific field
in UPIU printed by query trace are identical. This is not very
practical. As below:

query_send: HDR:16 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00 00 00 00 00 00 00 00 00 00 00 00
query_complete: HDR:16 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00 00 00 00 00 00 00 00 00 00 00 00

For the failure analysis, we want to understand the real response
reported by the UFS device, however, the current query trace tells
us nothing. After this patch, the query trace on the query_send, and
the above a pair of query_send and query_complete will be:

query_send: HDR:16 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00 00 00 00 00 00 00 00 00 00 00 00
ufshcd_upiu: HDR:36 00 00 0e 00 81 00 00 00 00 00 00, CDB:06 0e 03 00 00 00 00 00 00 00 00 01 00 00 00 00

Acked-by: Avri Altman <avri.altman@wdc.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Bean Huo <beanhuo@micron.com>
---
 drivers/scsi/ufs/ufshcd.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index f4a071d12542..d0b054aa0a3c 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -318,12 +318,18 @@  static void ufshcd_add_cmd_upiu_trace(struct ufs_hba *hba, unsigned int tag,
 static void ufshcd_add_query_upiu_trace(struct ufs_hba *hba, unsigned int tag,
 					enum ufs_trace_str_t str_t)
 {
-	struct utp_upiu_req *rq = hba->lrb[tag].ucd_req_ptr;
+	struct utp_upiu_req *rq_rsp;
 
 	if (!trace_ufshcd_upiu_enabled())
 		return;
 
-	trace_ufshcd_upiu(dev_name(hba->dev), str_t, &rq->header, &rq->qr);
+	if (str_t == UFS_QUERY_SEND)
+		rq_rsp = hba->lrb[tag].ucd_req_ptr;
+	else
+		rq_rsp = (struct utp_upiu_req *)hba->lrb[tag].ucd_rsp_ptr;
+
+	trace_ufshcd_upiu(dev_name(hba->dev), str_t, &rq_rsp->header,
+			  &rq_rsp->qr);
 }
 
 static void ufshcd_add_tm_upiu_trace(struct ufs_hba *hba, unsigned int tag,