[PATCH v3] scsi: ufs: core: Add trace event for MCQ

[Ziqi Chen]

Added a new trace event to record MCQ relevant information
for each request in MCQ mode, include hardware queue ID,
SQ tail slot, CQ head slot and CQ tail slot.

Signed-off-by: Ziqi Chen <quic_ziqichen@xxxxxxxxxxx>

---
Changes to v2:
- Shorten printing strings.

Changes to v1:
- Adjust the order of fileds to keep them aligned.
---
 drivers/ufs/core/ufshcd.c  | 14 +++++++++++---
 include/trace/events/ufs.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 3b3cf78..67cb90d 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -426,6 +426,7 @@ static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
 	struct ufshcd_lrb *lrbp = &hba->lrb[tag];
 	struct scsi_cmnd *cmd = lrbp->cmd;
 	struct request *rq = scsi_cmd_to_rq(cmd);
+	struct ufs_hw_queue *hwq;
 	int transfer_len = -1;
 
 	if (!cmd)
@@ -456,9 +457,16 @@ static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
 	}
 
 	intr = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
-	doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
-	trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
-			doorbell, transfer_len, intr, lba, opcode, group_id);
+
+	if (is_mcq_enabled(hba)) {
+		hwq = ufshcd_mcq_req_to_hwq(hba, rq);
+		trace_ufshcd_command_mcq(dev_name(hba->dev), str_t, tag,
+				hwq, transfer_len, intr, lba, opcode, group_id);
+	} else {
+		doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
+		trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
+				doorbell, transfer_len, intr, lba, opcode, group_id);
+	}
 }
 
 static void ufshcd_print_clk_freqs(struct ufs_hba *hba)
diff --git a/include/trace/events/ufs.h b/include/trace/events/ufs.h
index 599739e..604b2cd 100644
--- a/include/trace/events/ufs.h
+++ b/include/trace/events/ufs.h
@@ -10,6 +10,7 @@
 #define _TRACE_UFS_H
 
 #include <linux/tracepoint.h>
+#include <ufs/ufshcd.h>
 
 #define str_opcode(opcode)						\
 	__print_symbolic(opcode,					\
@@ -307,6 +308,53 @@ TRACE_EVENT(ufshcd_command,
 	)
 );
 
+TRACE_EVENT(ufshcd_command_mcq,
+	TP_PROTO(const char *dev_name, enum ufs_trace_str_t str_t,
+		unsigned int tag, struct ufs_hw_queue *hwq, int transfer_len,
+		u32 intr, u64 lba, u8 opcode, u8 group_id),
+
+	TP_ARGS(dev_name, str_t, tag, hwq, transfer_len, intr, lba, opcode, group_id),
+
+	TP_STRUCT__entry(
+		__string(dev_name, dev_name)
+		__field(enum ufs_trace_str_t, str_t)
+		__field(unsigned int, tag)
+		__field(u32, hwq_id)
+		__field(u32, sq_tail)
+		__field(u32, cq_head)
+		__field(u32, cq_tail)
+		__field(int, transfer_len)
+		__field(u32, intr)
+		__field(u64, lba)
+		__field(u8, opcode)
+		__field(u8, group_id)
+	),
+
+	TP_fast_assign(
+		__assign_str(dev_name, dev_name);
+		__entry->str_t = str_t;
+		__entry->tag = tag;
+		__entry->hwq_id = hwq->id;
+		__entry->sq_tail = hwq->sq_tail_slot;
+		__entry->cq_head = hwq->cq_head_slot;
+		__entry->cq_tail = hwq->cq_tail_slot;
+		__entry->transfer_len = transfer_len;
+		__entry->intr = intr;
+		__entry->lba = lba;
+		__entry->opcode = opcode;
+		__entry->group_id = group_id;
+	),
+
+	TP_printk(
+		"%s: %s: tag: %u, hqid: %d, size: %d, IS: %u, LBA: %llu, opcode: 0x%x (%s), group_id: 0x%x, sqt: %d, cqh: %d, cqt: %d",
+		show_ufs_cmd_trace_str(__entry->str_t), __get_str(dev_name),
+		__entry->tag, __entry->hwq_id, __entry->transfer_len,
+		__entry->intr, __entry->lba, (u32)__entry->opcode,
+		str_opcode(__entry->opcode), (u32)__entry->group_id,
+		__entry->sq_tail, __entry->cq_head,  __entry->cq_tail
+	)
+);
+
 TRACE_EVENT(ufshcd_uic_command,
 	TP_PROTO(const char *dev_name, enum ufs_trace_str_t str_t, u32 cmd,
 		 u32 arg1, u32 arg2, u32 arg3),
-- 
2.7.4