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nvmet: add async event tracing support 

This adds a new tracepoint for the target to trace async event. This is
helpful in debugging and comparing host and target side async events
especially when host is connected to different targets on different
machines and now that we rely on userspace components to generate AEN. 

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni 2020-05-19 01:06:30 -07:00 committed by Christoph Hellwig
parent ec0862ac5a
commit 696ece7513
2 changed files with 29 additions and 0 deletions
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1
drivers/nvme/target/core.c
View File

@ -151,6 +151,7 @@ static void nvmet_async_events_process(struct nvmet_ctrl *ctrl, u16 status)
kfree(aen);
mutex_unlock(&ctrl->lock);
trace_nvmet_async_event(ctrl, req->cqe->result.u32);
nvmet_req_complete(req, status);
}
}

28
drivers/nvme/target/trace.h
View File

@ -130,6 +130,34 @@ TRACE_EVENT(nvmet_req_complete,
);
#define aer_name(aer) { aer, #aer }
TRACE_EVENT(nvmet_async_event,
TP_PROTO(struct nvmet_ctrl *ctrl, __le32 result),
TP_ARGS(ctrl, result),
TP_STRUCT__entry(
__field(int, ctrl_id)
__field(u32, result)
),
TP_fast_assign(
__entry->ctrl_id = ctrl->cntlid;
__entry->result = (le32_to_cpu(result) & 0xff00) >> 8;
),
TP_printk("nvmet%d: NVME_AEN=%#08x [%s]",
__entry->ctrl_id, __entry->result,
__print_symbolic(__entry->result,
aer_name(NVME_AER_NOTICE_NS_CHANGED),
aer_name(NVME_AER_NOTICE_ANA),
aer_name(NVME_AER_NOTICE_FW_ACT_STARTING),
aer_name(NVME_AER_NOTICE_DISC_CHANGED),
aer_name(NVME_AER_ERROR),
aer_name(NVME_AER_SMART),
aer_name(NVME_AER_CSS),
aer_name(NVME_AER_VS))
)
);
#undef aer_name
#endif /* _TRACE_NVMET_H */
#undef TRACE_INCLUDE_PATH