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nvme-pci: trace SQ status on completions

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Export the disk name, queue id, sq_head, sq_tail to a trace event in
completion handling.

Usage example:

cd /sys/kernel/debug/tracing/events/nvme/nvme_sq

echo 'disk=="nvme1n1"' > filter

echo 1 > enable

cat /sys/kernel/debug/tracing/trace_pipe

Signed-off-by: yupeng <yupeng0921@gmail.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Keith Busch <keith.busch@intel.com>
[hch: slight formatting tweaks, use standard nvme tracepoint
 conventions]
Signed-off-by: Christoph Hellwig <hch@lst.de>

wip
This commit is contained in:
yupeng 2018-12-18 17:59:53 +01:00 committed by Christoph Hellwig
parent ff8519f9e9
commit 604c01d567
3 changed files with 28 additions and 0 deletions
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2
drivers/nvme/host/pci.c
View file

@ -32,6 +32,7 @@
#include <linux/sed-opal.h>
#include <linux/pci-p2pdma.h>
#include "trace.h"
#include "nvme.h"
#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
@ -1003,6 +1004,7 @@ static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, u16 idx)
}
req = blk_mq_tag_to_rq(*nvmeq->tags, cqe->command_id);
trace_nvme_sq(req, cqe->sq_head, nvmeq->sq_tail);
nvme_end_request(req, cqe->status, cqe->result);
}

3
drivers/nvme/host/trace.c
View file

@ -139,3 +139,6 @@ const char *nvme_trace_disk_name(struct trace_seq *p, char *name)
return ret;
}
EXPORT_SYMBOL_GPL(nvme_trace_disk_name);
EXPORT_TRACEPOINT_SYMBOL_GPL(nvme_sq);

23
drivers/nvme/host/trace.h
View file

@ -184,6 +184,29 @@ TRACE_EVENT(nvme_async_event,
#undef aer_name
TRACE_EVENT(nvme_sq,
TP_PROTO(struct request *req, __le16 sq_head, int sq_tail),
TP_ARGS(req, sq_head, sq_tail),
TP_STRUCT__entry(
__field(int, ctrl_id)
__array(char, disk, DISK_NAME_LEN)
__field(int, qid)
__field(u16, sq_head)
__field(u16, sq_tail)
),
TP_fast_assign(
__entry->ctrl_id = nvme_req(req)->ctrl->instance;
__assign_disk_name(__entry->disk, req->rq_disk);
__entry->qid = nvme_req_qid(req);
__entry->sq_head = le16_to_cpu(sq_head);
__entry->sq_tail = sq_tail;
),
TP_printk("nvme%d: %sqid=%d, head=%u, tail=%u",
__entry->ctrl_id, __print_disk_name(__entry->disk),
__entry->qid, __entry->sq_head, __entry->sq_tail
)
);
#endif /* _TRACE_NVME_H */
#undef TRACE_INCLUDE_PATH