scsi: ufs: core: Include the SCSI ID in UFS command tracing output

The logical unit information is missing from the UFS command tracing
output. Although the device name is logged, e.g. 13200000.ufs, this name
does not include logical unit information. Hence this patch that replaces
the device name with the SCSI ID in the tracing output. An example of
tracing output with this patch applied:

    kworker/8:0H-80      [008] .....    89.106063: ufshcd_command: send_req: 0:0:0:4: tag: 10, DB: 0x7ffffbff, size: 524288, IS: 0, LBA: 1085538, opcode: 0x8a (WRITE_16), group_id: 0x0
              dd-4225    [000] d.h..    89.106219: ufshcd_command: complete_rsp: 0:0:0:4: tag: 11, DB: 0x7ffff7ff, size: 524288, IS: 0, LBA: 1081728, opcode: 0x8a (WRITE_16), group_id: 0x0

Cc: Christoph Hellwig <[email protected]>
Cc: Steven Rostedt <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Can Guo <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: bvanassche

drivers/ufs/core/ufshcd.c

@@ -446,8 +446,8 @@ static void ufshcd_add_command_trace(struct ufs_hba *hba, unsigned int tag,
 	} else {
 		doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
 	}
-	trace_ufshcd_command(dev_name(hba->dev), str_t, tag,
-			doorbell, hwq_id, transfer_len, intr, lba, opcode, group_id);
+	trace_ufshcd_command(cmd->device, str_t, tag, doorbell, hwq_id,
+			     transfer_len, intr, lba, opcode, group_id);
 }
 
 static void ufshcd_print_clk_freqs(struct ufs_hba *hba)

include/trace/events/ufs.h

@@ -267,15 +267,15 @@ DEFINE_EVENT(ufshcd_template, ufshcd_wl_runtime_resume,
 	     TP_ARGS(dev_name, err, usecs, dev_state, link_state));
 
 TRACE_EVENT(ufshcd_command,
-	TP_PROTO(const char *dev_name, enum ufs_trace_str_t str_t,
+	TP_PROTO(struct scsi_device *sdev, enum ufs_trace_str_t str_t,
 		 unsigned int tag, u32 doorbell, u32 hwq_id, int transfer_len,
 		 u32 intr, u64 lba, u8 opcode, u8 group_id),
 
-	TP_ARGS(dev_name, str_t, tag, doorbell, hwq_id, transfer_len,
-			intr, lba, opcode, group_id),
+	TP_ARGS(sdev, str_t, tag, doorbell, hwq_id, transfer_len, intr, lba,
+		opcode, group_id),
 
 	TP_STRUCT__entry(
-		__string(dev_name, dev_name)
+		__field(struct scsi_device *, sdev)
 		__field(enum ufs_trace_str_t, str_t)
 		__field(unsigned int, tag)
 		__field(u32, doorbell)
@@ -288,7 +288,7 @@ TRACE_EVENT(ufshcd_command,
 	),
 
 	TP_fast_assign(
-		__assign_str(dev_name, dev_name);
+		__entry->sdev = sdev;
 		__entry->str_t = str_t;
 		__entry->tag = tag;
 		__entry->doorbell = doorbell;
@@ -302,8 +302,9 @@ TRACE_EVENT(ufshcd_command,
 
 	TP_printk(
 		"%s: %s: tag: %u, DB: 0x%x, size: %d, IS: %u, LBA: %llu, opcode: 0x%x (%s), group_id: 0x%x, hwq_id: %d",
-		show_ufs_cmd_trace_str(__entry->str_t), __get_str(dev_name),
-		__entry->tag, __entry->doorbell, __entry->transfer_len, __entry->intr,
+		show_ufs_cmd_trace_str(__entry->str_t),
+		dev_name(&__entry->sdev->sdev_dev), __entry->tag,
+		__entry->doorbell, __entry->transfer_len, __entry->intr,
 		__entry->lba, (u32)__entry->opcode, str_opcode(__entry->opcode),
 		(u32)__entry->group_id, __entry->hwq_id
 	)