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null_blk: add tracepoint helpers for zoned mode

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This patch adds two new tracpoints for null_blk_zoned.c that allows us
to trace report-zones, zone-mgmt-op and zone-write operations which has
direct effect on the zone condition state machine.

Also, we update drivers/block/Makefile so that new null_blk related
tracefiles can be compiled.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Chaitanya Kulkarni 2020-03-25 10:49:55 -07:00 committed by Jens Axboe
parent 02694e8635
commit c51d041998
3 changed files with 106 additions and 0 deletions
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6
drivers/block/Makefile
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@ -6,6 +6,9 @@
# Rewritten to use lists instead of if-statements.
#
# needed for trace events
ccflags-y += -I$(src)
obj-$(CONFIG_MAC_FLOPPY) += swim3.o
obj-$(CONFIG_BLK_DEV_SWIM) += swim_mod.o
obj-$(CONFIG_BLK_DEV_FD) += floppy.o
@ -39,6 +42,9 @@ obj-$(CONFIG_ZRAM) += zram/
obj-$(CONFIG_BLK_DEV_NULL_BLK) += null_blk.o
null_blk-objs := null_blk_main.o
ifeq ($(CONFIG_BLK_DEV_ZONED), y)
null_blk-$(CONFIG_TRACING) += null_blk_trace.o
endif
null_blk-$(CONFIG_BLK_DEV_ZONED) += null_blk_zoned.o
skd-y := skd_main.o

21
drivers/block/null_blk_trace.c Normal file
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@ -0,0 +1,21 @@
// SPDX-License-Identifier: GPL-2.0
/*
* null_blk trace related helpers.
*
* Copyright (C) 2020 Western Digital Corporation or its affiliates.
*/
#include "null_blk_trace.h"
/*
* Helper to use for all null_blk traces to extract disk name.
*/
const char *nullb_trace_disk_name(struct trace_seq *p, char *name)
{
const char *ret = trace_seq_buffer_ptr(p);
if (name && *name)
trace_seq_printf(p, "disk=%s, ", name);
trace_seq_putc(p, 0);
return ret;
}

79
drivers/block/null_blk_trace.h Normal file
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@ -0,0 +1,79 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* null_blk device driver tracepoints.
*
* Copyright (C) 2020 Western Digital Corporation or its affiliates.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM nullb
#if !defined(_TRACE_NULLB_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_NULLB_H
#include <linux/tracepoint.h>
#include <linux/trace_seq.h>
#include "null_blk.h"
const char *nullb_trace_disk_name(struct trace_seq *p, char *name);
#define __print_disk_name(name) nullb_trace_disk_name(p, name)
#ifndef TRACE_HEADER_MULTI_READ
static inline void __assign_disk_name(char *name, struct gendisk *disk)
{
if (disk)
memcpy(name, disk->disk_name, DISK_NAME_LEN);
else
memset(name, 0, DISK_NAME_LEN);
}
#endif
TRACE_EVENT(nullb_zone_op,
TP_PROTO(struct nullb_cmd *cmd, unsigned int zone_no,
unsigned int zone_cond),
TP_ARGS(cmd, zone_no, zone_cond),
TP_STRUCT__entry(
__array(char, disk, DISK_NAME_LEN)
__field(enum req_opf, op)
__field(unsigned int, zone_no)
__field(unsigned int, zone_cond)
),
TP_fast_assign(
__entry->op = req_op(cmd->rq);
__entry->zone_no = zone_no;
__entry->zone_cond = zone_cond;
__assign_disk_name(__entry->disk, cmd->rq->rq_disk);
),
TP_printk("%s req=%-15s zone_no=%u zone_cond=%-10s",
__print_disk_name(__entry->disk),
blk_op_str(__entry->op),
__entry->zone_no,
blk_zone_cond_str(__entry->zone_cond))
);
TRACE_EVENT(nullb_report_zones,
TP_PROTO(struct nullb *nullb, unsigned int nr_zones),
TP_ARGS(nullb, nr_zones),
TP_STRUCT__entry(
__array(char, disk, DISK_NAME_LEN)
__field(unsigned int, nr_zones)
),
TP_fast_assign(
__entry->nr_zones = nr_zones;
__assign_disk_name(__entry->disk, nullb->disk);
),
TP_printk("%s nr_zones=%u",
__print_disk_name(__entry->disk), __entry->nr_zones)
);
#endif /* _TRACE_NULLB_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE null_blk_trace
/* This part must be outside protection */
#include <trace/define_trace.h>