scsi: sd: sd_zbc: Trace zone append emulation

Add tracepoints to the SCSI zone append emulation in order to trace the
zone start to write-pointer aligned LBA translation and the corresponding
completion.

Signed-off-by: Johannes Thumshirn <[email protected]>
Link: https://lore.kernel.org/r/d103bcf5f90139143469f2a0084c74bd9e03ad4a.1669804487.git.johannes.thumshirn@wdc.com
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jason Yan <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: morbidrsa

drivers/scsi/sd_trace.h

@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 Western Digital Corporation or its affiliates.
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM sd
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE sd_trace
+
+#if !defined(_SD_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(scsi_prepare_zone_append,
+
+	    TP_PROTO(struct scsi_cmnd *cmnd, sector_t lba,
+		     unsigned int wp_offset),
+
+	    TP_ARGS(cmnd, lba, wp_offset),
+
+	    TP_STRUCT__entry(
+		     __field( unsigned int, host_no )
+		     __field( unsigned int, channel )
+		     __field( unsigned int, id )
+		     __field( unsigned int, lun )
+		     __field( sector_t,     lba )
+		     __field( unsigned int, wp_offset )
+	    ),
+
+	    TP_fast_assign(
+		__entry->host_no	= cmnd->device->host->host_no;
+		__entry->channel	= cmnd->device->channel;
+		__entry->id		= cmnd->device->id;
+		__entry->lun		= cmnd->device->lun;
+		__entry->lba		= lba;
+		__entry->wp_offset	= wp_offset;
+	    ),
+
+	    TP_printk("host_no=%u, channel=%u id=%u lun=%u lba=%llu wp_offset=%u",
+		      __entry->host_no, __entry->channel, __entry->id,
+		      __entry->lun, __entry->lba, __entry->wp_offset)
+);
+
+TRACE_EVENT(scsi_zone_wp_update,
+
+	    TP_PROTO(struct scsi_cmnd *cmnd, sector_t rq_sector,
+		     unsigned int wp_offset, unsigned int good_bytes),
+
+	    TP_ARGS(cmnd, rq_sector, wp_offset, good_bytes),
+
+	    TP_STRUCT__entry(
+		     __field( unsigned int, host_no )
+		     __field( unsigned int, channel )
+		     __field( unsigned int, id )
+		     __field( unsigned int, lun )
+		     __field( sector_t,     rq_sector )
+		     __field( unsigned int, wp_offset )
+		     __field( unsigned int, good_bytes )
+	    ),
+
+	    TP_fast_assign(
+		__entry->host_no	= cmnd->device->host->host_no;
+		__entry->channel	= cmnd->device->channel;
+		__entry->id		= cmnd->device->id;
+		__entry->lun		= cmnd->device->lun;
+		__entry->rq_sector	= rq_sector;
+		__entry->wp_offset	= wp_offset;
+		__entry->good_bytes	= good_bytes;
+	    ),
+
+	    TP_printk("host_no=%u, channel=%u id=%u lun=%u rq_sector=%llu" \
+		      " wp_offset=%u good_bytes=%u",
+		      __entry->host_no, __entry->channel, __entry->id,
+		      __entry->lun, __entry->rq_sector, __entry->wp_offset,
+		      __entry->good_bytes)
+);
+#endif /* _SD_TRACE_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH ../../drivers/scsi
+#include <trace/define_trace.h>

drivers/scsi/sd_zbc.c

@@ -20,6 +20,9 @@
 
 #include "sd.h"
 
+#define CREATE_TRACE_POINTS
+#include "sd_trace.h"
+
 /**
  * sd_zbc_get_zone_wp_offset - Get zone write pointer offset.
  * @zone: Zone for which to return the write pointer offset.
@@ -450,6 +453,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 			break;
 		}
 
+		trace_scsi_prepare_zone_append(cmd, *lba, wp_offset);
 		*lba += wp_offset;
 	}
 	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
@@ -558,6 +562,8 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
 
 	switch (op) {
 	case REQ_OP_ZONE_APPEND:
+		trace_scsi_zone_wp_update(cmd, rq->__sector,
+				  sdkp->zones_wp_offset[zno], good_bytes);
 		rq->__sector += sdkp->zones_wp_offset[zno];
 		fallthrough;
 	case REQ_OP_WRITE_ZEROES: