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a5448fdc46
This patch introduces target-side request tracing. As Christoph suggested, the trace would not be in a core or module to avoid disadvantages like cache miss: http://lists.infradead.org/pipermail/linux-nvme/2019-June/024721.html The target-side trace code is entirely based on the Johannes's trace code from the host side. It has lots of codes duplicated, but it would be better than having advantages mentioned above. It also traces not only fabrics commands, but also nvme normal commands. Once the codes to be shared gets bigger, then we can make it common as suggsted. This also removed the create_sq and create_cq trace parsing functions because it will be done by the connect fabrics command. Example: echo 1 > /sys/kernel/debug/tracing/event/nvmet/nvmet_req_init/enable echo 1 > /sys/kernel/debug/tracing/event/nvmet/nvmet_req_complete/enable cat /sys/kernel/debug/tracing/trace Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com> [hch: fixed the symbol namespace and a an endianess conversion] Signed-off-by: Christoph Hellwig <hch@lst.de>
141 lines
4 KiB
C
141 lines
4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* NVM Express target device driver tracepoints
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* Copyright (c) 2018 Johannes Thumshirn, SUSE Linux GmbH
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*
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* This is entirely based on drivers/nvme/host/trace.h
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*/
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM nvmet
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#if !defined(_TRACE_NVMET_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_NVMET_H
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#include <linux/nvme.h>
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#include <linux/tracepoint.h>
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#include <linux/trace_seq.h>
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#include "nvmet.h"
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const char *nvmet_trace_parse_admin_cmd(struct trace_seq *p, u8 opcode,
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u8 *cdw10);
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const char *nvmet_trace_parse_nvm_cmd(struct trace_seq *p, u8 opcode,
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u8 *cdw10);
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const char *nvmet_trace_parse_fabrics_cmd(struct trace_seq *p, u8 fctype,
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u8 *spc);
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#define parse_nvme_cmd(qid, opcode, fctype, cdw10) \
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((opcode) == nvme_fabrics_command ? \
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nvmet_trace_parse_fabrics_cmd(p, fctype, cdw10) : \
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(qid ? \
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nvmet_trace_parse_nvm_cmd(p, opcode, cdw10) : \
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nvmet_trace_parse_admin_cmd(p, opcode, cdw10)))
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const char *nvmet_trace_ctrl_name(struct trace_seq *p, struct nvmet_ctrl *ctrl);
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#define __print_ctrl_name(ctrl) \
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nvmet_trace_ctrl_name(p, ctrl)
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const char *nvmet_trace_disk_name(struct trace_seq *p, char *name);
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#define __print_disk_name(name) \
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nvmet_trace_disk_name(p, name)
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#ifndef TRACE_HEADER_MULTI_READ
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static inline struct nvmet_ctrl *nvmet_req_to_ctrl(struct nvmet_req *req)
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{
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return req->sq->ctrl;
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}
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static inline void __assign_disk_name(char *name, struct nvmet_req *req,
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bool init)
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{
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struct nvmet_ctrl *ctrl = nvmet_req_to_ctrl(req);
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struct nvmet_ns *ns;
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if ((init && req->sq->qid) || (!init && req->cq->qid)) {
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ns = nvmet_find_namespace(ctrl, req->cmd->rw.nsid);
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strncpy(name, ns->device_path, DISK_NAME_LEN);
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return;
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}
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memset(name, 0, DISK_NAME_LEN);
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}
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#endif
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TRACE_EVENT(nvmet_req_init,
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TP_PROTO(struct nvmet_req *req, struct nvme_command *cmd),
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TP_ARGS(req, cmd),
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TP_STRUCT__entry(
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__field(struct nvme_command *, cmd)
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__field(struct nvmet_ctrl *, ctrl)
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__array(char, disk, DISK_NAME_LEN)
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__field(int, qid)
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__field(u16, cid)
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__field(u8, opcode)
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__field(u8, fctype)
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__field(u8, flags)
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__field(u32, nsid)
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__field(u64, metadata)
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__array(u8, cdw10, 24)
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),
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TP_fast_assign(
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__entry->cmd = cmd;
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__entry->ctrl = nvmet_req_to_ctrl(req);
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__assign_disk_name(__entry->disk, req, true);
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__entry->qid = req->sq->qid;
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__entry->cid = cmd->common.command_id;
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__entry->opcode = cmd->common.opcode;
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__entry->fctype = cmd->fabrics.fctype;
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__entry->flags = cmd->common.flags;
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__entry->nsid = le32_to_cpu(cmd->common.nsid);
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__entry->metadata = le64_to_cpu(cmd->common.metadata);
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memcpy(__entry->cdw10, &cmd->common.cdw10,
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sizeof(__entry->cdw10));
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),
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TP_printk("nvmet%s: %sqid=%d, cmdid=%u, nsid=%u, flags=%#x, "
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"meta=%#llx, cmd=(%s, %s)",
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__print_ctrl_name(__entry->ctrl),
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__print_disk_name(__entry->disk),
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__entry->qid, __entry->cid, __entry->nsid,
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__entry->flags, __entry->metadata,
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show_opcode_name(__entry->qid, __entry->opcode,
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__entry->fctype),
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parse_nvme_cmd(__entry->qid, __entry->opcode,
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__entry->fctype, __entry->cdw10))
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);
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TRACE_EVENT(nvmet_req_complete,
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TP_PROTO(struct nvmet_req *req),
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TP_ARGS(req),
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TP_STRUCT__entry(
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__field(struct nvmet_ctrl *, ctrl)
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__array(char, disk, DISK_NAME_LEN)
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__field(int, qid)
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__field(int, cid)
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__field(u64, result)
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__field(u16, status)
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),
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TP_fast_assign(
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__entry->ctrl = nvmet_req_to_ctrl(req);
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__entry->qid = req->cq->qid;
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__entry->cid = req->cqe->command_id;
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__entry->result = le64_to_cpu(req->cqe->result.u64);
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__entry->status = le16_to_cpu(req->cqe->status) >> 1;
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__assign_disk_name(__entry->disk, req, false);
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),
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TP_printk("nvmet%s: %sqid=%d, cmdid=%u, res=%#llx, status=%#x",
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__print_ctrl_name(__entry->ctrl),
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__print_disk_name(__entry->disk),
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__entry->qid, __entry->cid, __entry->result, __entry->status)
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);
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#endif /* _TRACE_NVMET_H */
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH .
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#undef TRACE_INCLUDE_FILE
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#define TRACE_INCLUDE_FILE trace
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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