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scsi: sd: sd_zbc: Trace zone append emulation 

Add tracepoints to the SCSI zone append emulation in order to trace the
zone start to write-pointer aligned LBA translation and the corresponding
completion.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/d103bcf5f90139143469f2a0084c74bd9e03ad4a.1669804487.git.johannes.thumshirn@wdc.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Johannes Thumshirn 2022-11-30 02:36:16 -08:00 committed by Martin K. Petersen
parent 6456ab5d7c
commit 9f5436f47c
2 changed files with 90 additions and 0 deletions
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84
drivers/scsi/sd_trace.h Normal file
View File

@ -0,0 +1,84 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2022 Western Digital Corporation or its affiliates.
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM sd
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE sd_trace
#if !defined(_SD_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <linux/tracepoint.h>
TRACE_EVENT(scsi_prepare_zone_append,
TP_PROTO(struct scsi_cmnd *cmnd, sector_t lba,
unsigned int wp_offset),
TP_ARGS(cmnd, lba, wp_offset),
TP_STRUCT__entry(
__field( unsigned int, host_no )
__field( unsigned int, channel )
__field( unsigned int, id )
__field( unsigned int, lun )
__field( sector_t, lba )
__field( unsigned int, wp_offset )
),
TP_fast_assign(
__entry->host_no = cmnd->device->host->host_no;
__entry->channel = cmnd->device->channel;
__entry->id = cmnd->device->id;
__entry->lun = cmnd->device->lun;
__entry->lba = lba;
__entry->wp_offset = wp_offset;
),
TP_printk("host_no=%u, channel=%u id=%u lun=%u lba=%llu wp_offset=%u",
__entry->host_no, __entry->channel, __entry->id,
__entry->lun, __entry->lba, __entry->wp_offset)
);
TRACE_EVENT(scsi_zone_wp_update,
TP_PROTO(struct scsi_cmnd *cmnd, sector_t rq_sector,
unsigned int wp_offset, unsigned int good_bytes),
TP_ARGS(cmnd, rq_sector, wp_offset, good_bytes),
TP_STRUCT__entry(
__field( unsigned int, host_no )
__field( unsigned int, channel )
__field( unsigned int, id )
__field( unsigned int, lun )
__field( sector_t, rq_sector )
__field( unsigned int, wp_offset )
__field( unsigned int, good_bytes )
),
TP_fast_assign(
__entry->host_no = cmnd->device->host->host_no;
__entry->channel = cmnd->device->channel;
__entry->id = cmnd->device->id;
__entry->lun = cmnd->device->lun;
__entry->rq_sector = rq_sector;
__entry->wp_offset = wp_offset;
__entry->good_bytes = good_bytes;
),
TP_printk("host_no=%u, channel=%u id=%u lun=%u rq_sector=%llu" \
" wp_offset=%u good_bytes=%u",
__entry->host_no, __entry->channel, __entry->id,
__entry->lun, __entry->rq_sector, __entry->wp_offset,
__entry->good_bytes)
);
#endif /* _SD_TRACE_H */
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH ../../drivers/scsi
#include <trace/define_trace.h>

6
drivers/scsi/sd_zbc.c
View File

@ -20,6 +20,9 @@
#include "sd.h"
#define CREATE_TRACE_POINTS
#include "sd_trace.h"
/**
* sd_zbc_get_zone_wp_offset - Get zone write pointer offset.
* @zone: Zone for which to return the write pointer offset.
@ -450,6 +453,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
break;
}
trace_scsi_prepare_zone_append(cmd, *lba, wp_offset);
*lba += wp_offset;
}
spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
@ -558,6 +562,8 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
switch (op) {
case REQ_OP_ZONE_APPEND:
trace_scsi_zone_wp_update(cmd, rq->__sector,
sdkp->zones_wp_offset[zno], good_bytes);
rq->__sector += sdkp->zones_wp_offset[zno];
fallthrough;
case REQ_OP_WRITE_ZEROES: