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// Copyright (C) 2005, 2006 IBM Corp.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version
/***********************************************************
* Trace the following activities of scsi layer: *
* 1. I/O Entry *
* 2. Issuing I/O to LLD *
* 3. I/O done by LLD *
* 4. I/O Complete *
* *
***********************************************************/
%{
#include <linux/types.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <linux/timer.h>
#include <linux/blkdev.h>
%}
probe addevent.scsi
= addevent.scsi.ioentry,
addevent.scsi.iodispatching,
addevent.scsi.iodone,
addevent.scsi.iocompleted
{}
/* mid-layer prepare a IO request */
probe addevent.scsi.ioentry
+= _addevent.scsi.ioentry
{
update_record()
}
probe _addevent.scsi.ioentry
= scsi.ioentry
{
log_scsi_ioentry(disk_major, disk_minor, device_state, req_addr)
}
/* Dispatch a command to the low-level driver. */
probe addevent.scsi.iodispatching
+= _addevent.scsi.iodispatching
{
update_record()
}
probe _addevent.scsi.iodispatching
= scsi.iodispatching
{
log_scsi_dispatch(host_no, channel, lun, dev_id, device_state,
data_direction, request_buffer, request_bufflen, req_addr)
}
/* I/O is done by low-level driver*/
probe addevent.scsi.iodone
+= _addevent.scsi.iodone
{
update_record()
}
probe _addevent.scsi.iodone
= scsi.iodone
{
/* scsi timer check. We should record the hook only
* when the timer is inactive. But there's a gap between
* the checking and the actual calling of scsi_delete_timer.
*/
if( scsi_timer_pending == 1) {
log_scsi_iodone_extra(host_no, channel, lun,
dev_id, device_state, data_direction, req_addr)
}
}
/* mid-layer processes the completed IO */
probe addevent.scsi.iocompleted
+= _addevent.scsi.iocompleted
{
update_record()
}
probe _addevent.scsi.iocompleted
= scsi.iocompleted
{
log_scsi_iocompleted(host_no, channel, lun, dev_id, device_state,
data_direction, req_addr, goodbytes)
}
/* log the info about scsi io entry */
function log_scsi_ioentry(major:long, minor:long, dev_state:long, req_addr:long)
%{
/*
major|minor|scsi_device_state|request_addr
*/
_lket_trace(_GROUP_SCSI, _HOOKID_SCSI_IOENTRY, "%1b%1b%1b%8b",
THIS->major, THIS->minor, THIS->dev_state, THIS->req_addr);
%}
/* log the info about scsi_dispatching_cmd */
function log_scsi_dispatch(host_no:long, channel:long, lun:long, dev_id:long,
device_state:long, data_direction:long, request_buffer:long,
request_bufflen:long, req_addr:long)
%{
_lket_trace(_GROUP_SCSI, _HOOKID_SCSI_IO_TO_LLD, "%1b%1b%1b%1b%1b%1b%8b%4b%8b",
THIS->host_no, THIS->channel, THIS->lun, THIS->dev_id,
THIS->device_state, THIS->data_direction, THIS->request_buffer,
THIS->request_bufflen, THIS->req_addr);
%}
/* log the info about scsi_done */
function log_scsi_iodone_extra(host_no:long, channel:long, lun:long,
dev_id:long, device_state:long, data_direction:long,
req_addr:long)
%{
_lket_trace(_GROUP_SCSI, _HOOKID_SCSI_IODONE_BY_LLD, "%1b%1b%1b%1b%1b%1b%8b",
THIS->host_no, THIS->channel, THIS->lun, THIS->dev_id,
THIS->device_state, THIS->data_direction, THIS->req_addr);
%}
/* log the info about scsi_dispatching_cmd */
function log_scsi_iocompleted(host_no:long, channel:long, lun:long, dev_id:long,
device_state:long, data_direction:long, req_addr:long, goodbytes:long)
%{
_lket_trace(_GROUP_SCSI, _HOOKID_SCSI_IOCOMP_BY_MIDLEVEL,
"%1b%1b%1b%1b%1b%1b%8b%4b", THIS->host_no, THIS->channel,
THIS->lun, THIS->dev_id, THIS->device_state, THIS->data_direction,
THIS->req_addr, THIS->goodbytes);
%}
probe never
{
printf("%d\n", GROUP_SCSI)
}
|
