This file is indexed.

/usr/share/systemtap/tapset/linux/scsi.stp is in systemtap-common 2.3-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
// scsi tapset
// Copyright (C) 2005, 2006, 2009 IBM Corp.
// Copyright (C) 2010 Red Hat
//
// 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.
// <tapsetdescription>
// This family of probe points is used to probe SCSI activities.
// </tapsetdescription>
%{
#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>
%}

function describe_data_direction:string(state:long)
%{ /* pure */
	switch ((long)STAP_ARG_state) {
		case DMA_BIDIRECTIONAL:  strlcpy(STAP_RETVALUE, "BIDIRECTIONAL", MAXSTRINGLEN); break;
		case DMA_TO_DEVICE:      strlcpy(STAP_RETVALUE, "TO_DEVICE",     MAXSTRINGLEN); break;
		case DMA_FROM_DEVICE:    strlcpy(STAP_RETVALUE, "FROM_DEVICE",   MAXSTRINGLEN); break;
		case DMA_NONE:           strlcpy(STAP_RETVALUE, "NONE",          MAXSTRINGLEN); break;
		default:                 strlcpy(STAP_RETVALUE, "[INVALID]",     MAXSTRINGLEN);
	}
%}

function describe_device_state:string(state:long)
%{ /* pure */
	switch ((long)STAP_ARG_state) {
		case SDEV_CREATED:       strlcpy(STAP_RETVALUE, "CREATED",       MAXSTRINGLEN); break;
		case SDEV_RUNNING:       strlcpy(STAP_RETVALUE, "RUNNING",       MAXSTRINGLEN); break;
		case SDEV_CANCEL:        strlcpy(STAP_RETVALUE, "CANCEL",        MAXSTRINGLEN); break;
		case SDEV_DEL:           strlcpy(STAP_RETVALUE, "DEL",           MAXSTRINGLEN); break;
		case SDEV_QUIESCE:       strlcpy(STAP_RETVALUE, "QUIESCE",       MAXSTRINGLEN); break;
		case SDEV_OFFLINE:       strlcpy(STAP_RETVALUE, "OFFLINE",       MAXSTRINGLEN); break;
#ifdef SDEV_BLOCK
		case SDEV_BLOCK:         strlcpy(STAP_RETVALUE, "BLOCK",         MAXSTRINGLEN); break;
#endif
#ifdef SDEV_CREATED_BLOCK
		case SDEV_CREATED_BLOCK: strlcpy(STAP_RETVALUE, "CREATED_BLOCK", MAXSTRINGLEN); break;
#endif
		default:                 strlcpy(STAP_RETVALUE, "[INVALID]",     MAXSTRINGLEN);
	}
%}
/**
  * probe scsi.ioentry - Prepares a SCSI mid-layer request
  * @disk_major: The major number of the disk (-1 if no information)
  * @disk_minor: The minor number of the disk (-1 if no information)
  * @device_state: The current state of the device
  * @device_state_str: The current state of the device, as a string
  * @req_addr: The current struct request pointer, as a number
  */
probe scsi.ioentry.scsilib =
      module("scsi_mod").function("scsi_prep_fn")!, kernel.function("scsi_prep_fn") { }
probe scsi.ioentry.sd =
      module("sd_mod").function("sd_prep_fn")!, kernel.function("sd_prep_fn") { }
probe scsi.ioentry.sr =
      module("sr_mod").function("sr_prep_fn")!, kernel.function("sr_prep_fn") { }

probe scsi.ioentry = scsi.ioentry.* ?
{
        req_addr = @choose_defined($req, $rq);
	if(@cast(req_addr,"request")->rq_disk == 0)  {
		disk_major = -1
		disk_minor = -1
	} else {
		disk_major = @cast(req_addr,"request")->rq_disk->major
		disk_minor = @cast(req_addr,"request")->rq_disk->first_minor
	}
	device_state = get_devstate_from_req($q)
	device_state_str = describe_device_state(device_state)
}

/**
 * probe scsi.iodispatching - SCSI mid-layer dispatched low-level SCSI command
 * @host_no: The host number
 * @channel: The channel number
 * @lun: The lun number
 * @dev_id: The scsi device id
 * @device_state: The current state of the device
 * @device_state_str: The current state of the device, as a string
 * @data_direction: The data_direction specifies whether this command is from/to the device
 *		0 (DMA_BIDIRECTIONAL), 1 (DMA_TO_DEVICE),
 *		2 (DMA_FROM_DEVICE), 3 (DMA_NONE)
 * @data_direction_str: Data direction, as a string
 * @request_buffer: The request buffer address
 * @request_bufflen: The request buffer length
 * @req_addr: The current struct request pointer, as a number
 */
probe scsi.iodispatching
	= module("scsi_mod").function("scsi_dispatch_cmd@drivers/scsi/scsi.c")!,
	  kernel.function("scsi_dispatch_cmd@drivers/scsi/scsi.c")?
{
	host_no = $cmd->device->host->host_no
	channel = $cmd->device->channel
	lun = $cmd->device->lun
	dev_id = $cmd->device->id
	device_state = $cmd->device->sdev_state
	device_state_str = describe_device_state(device_state)
	data_direction = $cmd->sc_data_direction
	data_direction_str = describe_data_direction(data_direction)
	request_buffer = @choose_defined($cmd->sdb->table->sgl,
					 $cmd->request_buffer)
	request_bufflen = @choose_defined($cmd->sdb->length,
					  $cmd->request_bufflen)
	req_addr = $cmd->request
}

/**
 * probe scsi.iodone - SCSI command completed by low level driver and enqueued into the done queue.
 * @host_no: The host number
 * @channel: The channel number
 * @lun: The lun number
 * @dev_id: The scsi device id
 * @device_state: The current state of the device
 * @device_state_str: The current state of the device, as a string
 * @data_direction: The data_direction specifies whether this command is
 * 		from/to the device.
 * @data_direction_str: Data direction, as a string
 * @req_addr: The current struct request pointer, as a number
 * @scsi_timer_pending: 1 if a timer is pending on this request
 */
probe scsi.iodone
	= module("scsi_mod").function("scsi_done@drivers/scsi/scsi.c")!,
	  kernel.function("scsi_done@drivers/scsi/scsi.c")?

{
	host_no = $cmd->device->host->host_no
	channel = $cmd->device->channel
	lun = $cmd->device->lun
	dev_id = $cmd->device->id
	device_state = $cmd->device->sdev_state
	device_state_str = describe_device_state(device_state)
	data_direction = $cmd->sc_data_direction
	data_direction_str = describe_data_direction(data_direction)
	req_addr = $cmd->request
	scsi_timer_pending = scsi_timer_pending($cmd);
}

/**
 * probe scsi.iocompleted - SCSI mid-layer running the completion processing for block device I/O requests
 * @host_no: The host number
 * @channel: The channel number
 * @lun: The lun number
 * @dev_id: The scsi device id
 * @device_state: The current state of the device
 * @device_state_str: The current state of the device, as a string
 * @data_direction: The data_direction specifies whether this command is from/to
 * 		the device
 * @data_direction_str: Data direction, as a string
 * @goodbytes: The bytes completed
 * @req_addr: The current struct request pointer, as a number
 */
// mid-layer processes the completed IO
probe scsi.iocompleted
	= module("scsi_mod").function("scsi_io_completion@drivers/scsi/scsi_lib.c")!,
	  kernel.function("scsi_io_completion@drivers/scsi/scsi_lib.c")?
{
	host_no = $cmd->device->host->host_no
	channel = $cmd->device->channel
	lun = $cmd->device->lun
	dev_id = $cmd->device->id
	device_state = $cmd->device->sdev_state
	device_state_str = describe_device_state(device_state)
	data_direction = $cmd->sc_data_direction
	data_direction_str = describe_data_direction(data_direction)
	req_addr = $cmd->request
	goodbytes = $good_bytes
}

function timer_pending:long(timer:long)
{
	return (@choose_defined(@cast(timer, "timer_list")->entry->next,
				@cast(timer, "timer_list")->base) != 0)
}

function scsi_timer_pending:long(cmd:long)
{
%( kernel_v >= "2.6.28" %?
	return timer_pending(&@cast(cmd, "scsi_cmnd", "kernel:scsi_mod")->request->q->timeout)
%:
	return timer_pending(&@cast(cmd, "scsi_cmnd", "kernel:scsi_mod")->eh_timeout)
%)
}

function get_devstate_from_req:long(var:long)
{
	sdev = @cast(var, "request_queue", "kernel:scsi_mod")->queuedata
	return @cast(sdev, "scsi_device", "kernel:scsi_mod")->sdev_state
}

/**
 * probe scsi.ioexecute - Create mid-layer SCSI request and wait for the result
 * @host_no: The host number
 * @channel: The channel number
 * @lun: The lun number
 * @dev_id: The scsi device id
 * @device_state: The current state of the device
 * @device_state_str: The current state of the device, as a string
 * @data_direction: The data_direction specifies whether this command is
 * 		from/to the device.
 * @data_direction_str: Data direction, as a string
 * @request_buffer: The data buffer address
 * @request_bufflen: The data buffer buffer length
 * @timeout: Request timeout in seconds
 * @retries: Number of times to retry request
 */
probe scsi.ioexecute
	= module("scsi_mod").function("scsi_execute@drivers/scsi/scsi_lib.c")!,
	  kernel.function("scsi_execute@drivers/scsi/scsi_lib.c")?
{
	host_no = $sdev->host->host_no
	channel = $sdev->channel
	lun = $sdev->lun
	dev_id = $sdev->id
	device_state = $sdev->sdev_state
	device_state_str = describe_device_state(device_state)
	data_direction = $data_direction
	data_direction_str = describe_data_direction(data_direction)
	request_buffer = $buffer
	request_bufflen = $bufflen
	timeout = $timeout
	retries = $retries
}

/**
 * probe scsi.set_state - Order SCSI device state change
 * @host_no: The host number
 * @channel: The channel number
 * @lun: The lun number
 * @dev_id: The scsi device id
 * @old_state: The current state of the device
 * @old_state_str: The current state of the device, as a string
 * @state: The new state of the device
 * @state_str: The new state of the device, as a string
 */
probe scsi.set_state
	= module("scsi_mod").function("scsi_device_set_state@drivers/scsi/scsi_lib.c")!,
	  kernel.function("scsi_device_set_state@drivers/scsi/scsi_lib.c")?
{
	state = $state
	state_str = describe_device_state(state)

	host_no = $sdev->host->host_no
	channel = $sdev->channel
	lun = $sdev->lun
	dev_id = $sdev->id
	old_state = $sdev->sdev_state
	old_state_str = describe_device_state(old_state)
}