blktrace: pass zfcp driver data

This patch writes the channel and fabric latencies in nanoseconds per
request via blktrace for later analysis. The utilization of the inbound
and outbound adapter queue is also reported.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h
index fd3a88777ac8..fa2a31780611 100644
--- a/drivers/s390/scsi/zfcp_fsf.h
+++ b/drivers/s390/scsi/zfcp_fsf.h
@@ -439,4 +439,16 @@ struct fsf_qtcb {
         u8 log[FSF_QTCB_LOG_SIZE];
 } __attribute__ ((packed));
 
+struct zfcp_blk_drv_data {
+#define ZFCP_BLK_DRV_DATA_MAGIC                 0x1
+        u32 magic;
+#define ZFCP_BLK_LAT_VALID                      0x1
+#define ZFCP_BLK_REQ_ERROR                      0x2
+        u16 flags;
+        u8 inb_usage;
+        u8 outb_usage;
+        u64 channel_lat;
+        u64 fabric_lat;
+} __attribute__ ((packed));
+
 #endif                          /* FSF_H */