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>

4 files changed, 49 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 8a13071c444c..9ce4c75bd190 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -583,6 +583,8 @@ struct zfcp_fsf_req {
         unsigned long long     issued;         /* request sent time (STCK) */
         struct zfcp_unit       *unit;
         void                    (*handler)(struct zfcp_fsf_req *);
+        u16                     qdio_outb_usage;/* usage of outbound queue */
+        u16                     qdio_inb_usage; /* usage of inbound queue */
 };
 
 /* driver data */
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 739356a5c123..5ae1d497e5ed 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -6,6 +6,7 @@
  * Copyright IBM Corporation 2002, 2008
  */
 
+#include <linux/blktrace_api.h>
 #include "zfcp_ext.h"
 
 static void zfcp_fsf_request_timeout_handler(unsigned long data)
@@ -777,6 +778,7 @@ static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
         list_add_tail(&req->list, &adapter->req_list[idx]);
         spin_unlock(&adapter->req_list_lock);
 
+        req->qdio_outb_usage = atomic_read(&req_q->count);
         req->issued = get_clock();
         if (zfcp_qdio_send(req)) {
                 /* Queues are down..... */
@@ -2082,6 +2084,36 @@ static void zfcp_fsf_req_latency(struct zfcp_fsf_req *req)
         spin_unlock_irqrestore(&unit->latencies.lock, flags);
 }
 
+#ifdef CONFIG_BLK_DEV_IO_TRACE
+static void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
+{
+        struct fsf_qual_latency_info *lat_inf;
+        struct scsi_cmnd *scsi_cmnd = (struct scsi_cmnd *)fsf_req->data;
+        struct request *req = scsi_cmnd->request;
+        struct zfcp_blk_drv_data trace;
+        int ticks = fsf_req->adapter->timer_ticks;
+
+        trace.flags = 0;
+        trace.magic = ZFCP_BLK_DRV_DATA_MAGIC;
+        if (fsf_req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA) {
+                trace.flags |= ZFCP_BLK_LAT_VALID;
+                lat_inf = &fsf_req->qtcb->prefix.prot_status_qual.latency_info;
+                trace.channel_lat = lat_inf->channel_lat * ticks;
+                trace.fabric_lat = lat_inf->fabric_lat * ticks;
+        }
+        if (fsf_req->status & ZFCP_STATUS_FSFREQ_ERROR)
+                trace.flags |= ZFCP_BLK_REQ_ERROR;
+        trace.inb_usage = fsf_req->qdio_inb_usage;
+        trace.outb_usage = fsf_req->qdio_outb_usage;
+
+        blk_add_driver_data(req->q, req, &trace, sizeof(trace));
+}
+#else
+static inline void zfcp_fsf_trace_latency(struct zfcp_fsf_req *fsf_req)
+{
+}
+#endif
+
 static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
 {
         struct scsi_cmnd *scpnt = req->data;
@@ -2114,6 +2146,8 @@ static void zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *req)
         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA)
                 zfcp_fsf_req_latency(req);
 
+        zfcp_fsf_trace_latency(req);
+
         if (unlikely(fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)) {
                 if (fcp_rsp_info[3] == RSP_CODE_GOOD)
                         set_host_byte(scpnt, DID_OK);
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 */
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index 3e05080e62d4..664752f90b20 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -115,6 +115,7 @@ static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
 
         fsf_req->sbal_response = sbal_idx;
+        fsf_req->qdio_inb_usage = atomic_read(&adapter->resp_q.count);
         zfcp_fsf_req_complete(fsf_req);
 }