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nvme: add tracepoint for nvme_complete_rq 

Add a tracepoint in nvme_complete_rq() for completions of NVMe commands. An
expmale output of the trace-point is as follows:

<idle>-0     [001] d.h.     3.505266: nvme_complete_rq: cmdid=989, qid=1, res=0, retries=0, flags=0x0, status=0

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
hifive-unleashed-5.1
Johannes Thumshirn 2018-01-26 11:21:38 +01:00 committed by Christoph Hellwig
parent 3d030e41d9
commit ca5554a696
2 changed files with 27 additions and 0 deletions
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2
drivers/nvme/host/core.c
View File

@ -220,6 +220,8 @@ void nvme_complete_rq(struct request *req)
{
blk_status_t status = nvme_error_status(req);
trace_nvme_complete_rq(req);
if (unlikely(status != BLK_STS_OK && nvme_req_needs_retry(req))) {
if (nvme_req_needs_failover(req, status)) {
nvme_failover_req(req);

25
drivers/nvme/host/trace.h
View File

@ -129,6 +129,31 @@ TRACE_EVENT(nvme_setup_nvm_cmd,
__parse_nvme_cmd(__entry->opcode, __entry->cdw10))
);
TRACE_EVENT(nvme_complete_rq,
TP_PROTO(struct request *req),
TP_ARGS(req),
TP_STRUCT__entry(
__field(int, qid)
__field(int, cid)
__field(u64, result)
__field(u8, retries)
__field(u8, flags)
__field(u16, status)
),
TP_fast_assign(
__entry->qid = req->q->id;
__entry->cid = req->tag;
__entry->result = le64_to_cpu(nvme_req(req)->result.u64);
__entry->retries = nvme_req(req)->retries;
__entry->flags = nvme_req(req)->flags;
__entry->status = nvme_req(req)->status;
),
TP_printk("cmdid=%u, qid=%d, res=%llu, retries=%u, flags=0x%x, status=%u",
__entry->cid, __entry->qid, __entry->result,
__entry->retries, __entry->flags, __entry->status)
);
#endif /* _TRACE_NVME_H */
#undef TRACE_INCLUDE_PATH