linux-kernel - [PATCH v1 2/3] scsi: ufs: Let command trace only for the cmd != null case

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Date:   Sun, 23 May 2021 23:14:08 +0200
From:   Bean Huo <huobean@...il.com>
To:     alim.akhtar@...sung.com, avri.altman@....com,
        asutoshd@...eaurora.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        beanhuo@...ron.com, bvanassche@....org, tomas.winkler@...el.com,
        cang@...eaurora.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/3] scsi: ufs: Let command trace only for the cmd != null case

From: Bean Huo <beanhuo@...ron.com>

For the query request, we already have query_trace, but in
ufshcd_send_command (), there will add two more redundant
traces. Since lrbp->cmd is null in the query request, the
below these two trace events provide nothing except the tag
and DB. Instead of letting them take up the limited trace
ring buffer, it’s better not to print these traces in case
of cmd == null.

ufshcd_command: send_req: ff3b0000.ufs: tag: 28, DB: 0x0, size: -1, IS: 0, LBA: 18446744073709551615, opcode: 0x0 (0x0), group_id: 0x0
ufshcd_command: dev_complete: ff3b0000.ufs: tag: 28, DB: 0x0, size: -1, IS: 0, LBA: 18446744073709551615, opcode: 0x0 (0x0), group_id: 0x0

Signed-off-by: Bean Huo <beanhuo@...ron.com>
---
 drivers/scsi/ufs/ufshcd.c | 49 ++++++++++++++++++---------------------
 1 file changed, 23 insertions(+), 26 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index dc5f13ccf176..ed9059b3e63d 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -376,33 +376,31 @@ static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
 	struct scsi_cmnd *cmd = lrbp->cmd;
 	int transfer_len = -1;
 
-	if (!trace_ufshcd_command_enabled()) {
-		/* trace UPIU W/O tracing command */
-		if (cmd)
-			ufshcd_add_cmd_upiu_trace(hba, tag, str_t);
+	if (!cmd)
 		return;
-	}
 
-	if (cmd) { /* data phase exists */
-		/* trace UPIU also */
-		ufshcd_add_cmd_upiu_trace(hba, tag, str_t);
-		opcode = cmd->cmnd[0];
-		if ((opcode == READ_10) || (opcode == WRITE_10)) {
-			/*
-			 * Currently we only fully trace read(10) and write(10)
-			 * commands
-			 */
-			if (cmd->request && cmd->request->bio)
-				lba = cmd->request->bio->bi_iter.bi_sector;
-			transfer_len = be32_to_cpu(
+	/* trace UPIU W/O tracing command */
+	ufshcd_add_cmd_upiu_trace(hba, tag, str_t);
+
+	if (!trace_ufshcd_command_enabled())
+		return;
+
+	opcode = cmd->cmnd[0];
+	if ((opcode == READ_10) || (opcode == WRITE_10)) {
+		/*
+		 * Currently we only fully trace read(10) and write(10)
+		 * commands
+		 */
+		if (cmd->request && cmd->request->bio)
+			lba = cmd->request->bio->bi_iter.bi_sector;
+		transfer_len = be32_to_cpu(
 				lrbp->ucd_req_ptr->sc.exp_data_transfer_len);
-			if (opcode == WRITE_10)
-				group_id = lrbp->cmd->cmnd[6];
-		} else if (opcode == UNMAP) {
-			if (cmd->request) {
-				lba = scsi_get_lba(cmd);
-				transfer_len = blk_rq_bytes(cmd->request);
-			}
+		if (opcode == WRITE_10)
+			group_id = lrbp->cmd->cmnd[6];
+	} else if (opcode == UNMAP) {
+		if (cmd->request) {
+			lba = scsi_get_lba(cmd);
+			transfer_len = blk_rq_bytes(cmd->request);
 		}
 	}
 
@@ -9774,8 +9772,7 @@ static const struct dev_pm_ops ufs_rpmb_pm_ops = {
 };
 
 /**
- * Describes the ufs rpmb wlun.
- * Used only to send uac.
+ * Describes the ufs rpmb wlun. Used only to send uac.
  */
 static struct scsi_driver ufs_rpmb_wlun_template = {
 	.gendrv = {
-- 
2.25.1