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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/block/null_blk/trace.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * null_blk device driver tracepoints.

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 *

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 * Copyright (C) 2020 Western Digital Corporation or its affiliates.

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 */

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#undef TRACE_SYSTEM

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#define TRACE_SYSTEM nullb

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#if !defined(_TRACE_NULLB_H) || defined(TRACE_HEADER_MULTI_READ)

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#define _TRACE_NULLB_H

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#include <linux/tracepoint.h>

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#include <linux/trace_seq.h>

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#include "null_blk.h"

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const char *nullb_trace_disk_name(struct trace_seq *p, char *name);

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#define __print_disk_name(name) nullb_trace_disk_name(p, name)

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#ifndef TRACE_HEADER_MULTI_READ

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static inline void __assign_disk_name(char *name, struct gendisk *disk)

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{

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	if (disk)

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		memcpy(name, disk->disk_name, DISK_NAME_LEN);

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	else

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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(nullb_zone_op,

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	    TP_PROTO(struct nullb_cmd *cmd, unsigned int zone_no,

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		     unsigned int zone_cond),

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	    TP_ARGS(cmd, zone_no, zone_cond),

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	    TP_STRUCT__entry(

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		__array(char, disk, DISK_NAME_LEN)

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		/*

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		 * __field() uses is_signed_type(). is_signed_type() does not

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		 * support bitwise types. Use __field_struct() instead because

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		 * it does not use is_signed_type().

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		 */

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		__field_struct(enum req_op, op)

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		__field(unsigned int, zone_no)

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		__field(unsigned int, zone_cond)

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	    ),

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	    TP_fast_assign(

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		__entry->op = req_op(blk_mq_rq_from_pdu(cmd));

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		__entry->zone_no = zone_no;

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		__entry->zone_cond = zone_cond;

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		__assign_disk_name(__entry->disk,

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			blk_mq_rq_from_pdu(cmd)->q->disk);

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	    ),

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	    TP_printk("%s req=%-15s zone_no=%u zone_cond=%-10s",

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		      __print_disk_name(__entry->disk),

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		      blk_op_str(__entry->op),

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		      __entry->zone_no,

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		      blk_zone_cond_str(__entry->zone_cond))

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);

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TRACE_EVENT(nullb_report_zones,

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	    TP_PROTO(struct nullb *nullb, unsigned int nr_zones),

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	    TP_ARGS(nullb, nr_zones),

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	    TP_STRUCT__entry(

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		__array(char, disk, DISK_NAME_LEN)

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		__field(unsigned int, nr_zones)

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	    ),

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	    TP_fast_assign(

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		__entry->nr_zones = nr_zones;

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		__assign_disk_name(__entry->disk, nullb->disk);

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	    ),

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	    TP_printk("%s nr_zones=%u",

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		      __print_disk_name(__entry->disk), __entry->nr_zones)

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);

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#endif /* _TRACE_NULLB_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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