drivers/block/null_blk/trace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * null_blk device driver tracepoints.
   4  *
   5  * Copyright (C) 2020 Western Digital Corporation or its affiliates.
   6  */
   7
   8 #undef TRACE_SYSTEM
   9 #define TRACE_SYSTEM nullb
  10
  11 #if !defined(_TRACE_NULLB_H) || defined(TRACE_HEADER_MULTI_READ)
  12 #define _TRACE_NULLB_H
  13
  14 #include <linux/tracepoint.h>
  15 #include <linux/trace_seq.h>
  16
  17 #include "null_blk.h"
  18
  19 const char *nullb_trace_disk_name(struct trace_seq *p, char *name);
  20
  21 #define __print_disk_name(name) nullb_trace_disk_name(p, name)
  22
  23 #ifndef TRACE_HEADER_MULTI_READ
  24 static inline void __assign_disk_name(char *name, struct gendisk *disk)
  25 {
  26         if (disk)
  27                 memcpy(name, disk->disk_name, DISK_NAME_LEN);
  28         else
  29                 memset(name, 0, DISK_NAME_LEN);
  30 }
  31 #endif
  32
  33 TRACE_EVENT(nullb_zone_op,
  34             TP_PROTO(struct nullb_cmd *cmd, unsigned int zone_no,
  35                      unsigned int zone_cond),
  36             TP_ARGS(cmd, zone_no, zone_cond),
  37             TP_STRUCT__entry(
  38                 __array(char, disk, DISK_NAME_LEN)
  39                 /*
  40                  * __field() uses is_signed_type(). is_signed_type() does not
  41                  * support bitwise types. Use __field_struct() instead because
  42                  * it does not use is_signed_type().
  43                  */
  44                 __field_struct(enum req_op, op)
  45                 __field(unsigned int, zone_no)
  46                 __field(unsigned int, zone_cond)
  47             ),
  48             TP_fast_assign(
  49                 __entry->op = req_op(blk_mq_rq_from_pdu(cmd));
  50                 __entry->zone_no = zone_no;
  51                 __entry->zone_cond = zone_cond;
  52                 __assign_disk_name(__entry->disk,
  53                         blk_mq_rq_from_pdu(cmd)->q->disk);
  54             ),
  55             TP_printk("%s req=%-15s zone_no=%u zone_cond=%-10s",
  56                       __print_disk_name(__entry->disk),
  57                       blk_op_str(__entry->op),
  58                       __entry->zone_no,
  59                       blk_zone_cond_str(__entry->zone_cond))
  60 );
  61
  62 TRACE_EVENT(nullb_report_zones,
  63             TP_PROTO(struct nullb *nullb, unsigned int nr_zones),
  64             TP_ARGS(nullb, nr_zones),
  65             TP_STRUCT__entry(
  66                 __array(char, disk, DISK_NAME_LEN)
  67                 __field(unsigned int, nr_zones)
  68             ),
  69             TP_fast_assign(
  70                 __entry->nr_zones = nr_zones;
  71                 __assign_disk_name(__entry->disk, nullb->disk);
  72             ),
  73             TP_printk("%s nr_zones=%u",
  74                       __print_disk_name(__entry->disk), __entry->nr_zones)
  75 );
  76
  77 #endif /* _TRACE_NULLB_H */
  78
  79 #undef TRACE_INCLUDE_PATH
  80 #define TRACE_INCLUDE_PATH .
  81 #undef TRACE_INCLUDE_FILE
  82 #define TRACE_INCLUDE_FILE trace
  83
  84 /* This part must be outside protection */
  85 #include <trace/define_trace.h>