null_blk: add trace in null_blk_zoned.c

With the help of previously added tracepoints we can now trace
report-zones, zone-write and zone-mgmt ops in null_blk_zoned.c.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/null_blk_zoned.c

@@ -2,6 +2,9 @@
 #include <linux/vmalloc.h>
 #include "null_blk.h"
 
+#define CREATE_TRACE_POINTS
+#include "null_blk_trace.h"
+
 /* zone_size in MBs to sectors. */
 #define ZONE_SIZE_SHIFT		11
 
@@ -80,6 +83,8 @@ int null_report_zones(struct gendisk *disk, sector_t sector,
 		return 0;
 
 	nr_zones = min(nr_zones, dev->nr_zones - first_zone);
+	trace_nullb_report_zones(nullb, nr_zones);
+
 	for (i = 0; i < nr_zones; i++) {
 		/*
 		 * Stacked DM target drivers will remap the zone information by
@@ -148,6 +153,8 @@ static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
 		/* Invalid zone condition */
 		return BLK_STS_IOERR;
 	}
+
+	trace_nullb_zone_op(cmd, zno, zone->cond);
 	return BLK_STS_OK;
 }
 
@@ -155,7 +162,8 @@ static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op,
 				   sector_t sector)
 {
 	struct nullb_device *dev = cmd->nq->dev;
-	struct blk_zone *zone = &dev->zones[null_zone_no(dev, sector)];
+	unsigned int zone_no = null_zone_no(dev, sector);
+	struct blk_zone *zone = &dev->zones[zone_no];
 	size_t i;
 
 	switch (op) {
@@ -203,6 +211,8 @@ static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_opf op,
 	default:
 		return BLK_STS_NOTSUPP;
 	}
+
+	trace_nullb_zone_op(cmd, zone_no, zone->cond);
 	return BLK_STS_OK;
 }