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// scsi tapset
// 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.
// <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>
%}
/**
* 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.
*/
// FIXME describe the device_state
probe scsi.ioentry
= module("scsi_mod").function("scsi_prep_fn@drivers/scsi/scsi_lib.c")!,
kernel.function("scsi_prep_fn@drivers/scsi/scsi_lib.c")?
{
if($req->rq_disk == 0) {
disk_major = -1
disk_minor = -1
} else {
disk_major = $req->rq_disk->major
disk_minor = $req->rq_disk->first_minor
}
device_state = get_devstate_from_req($q)
req_addr = $req
}
/**
* 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.
* @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)
* @request_buffer: The request buffer address
* @req_bufflen: The request buffer length
*/
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
data_direction = $cmd->sc_data_direction
%( kernel_v >= "2.6.25" %?
request_buffer = $cmd->sdb->table->sgl
request_bufflen = $cmd->sdb->length
%:
request_buffer = $cmd->request_buffer
request_bufflen = $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
* @data_direction: The data_direction specifies whether this command is
* from/to the device.
*/
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
data_direction = $cmd->sc_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
* @data_direction: The data_direction specifies whether this command is from/to
* the device
* @goodbytes: The bytes completed.
*/
// 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
data_direction = $cmd->sc_data_direction
req_addr = $cmd->request
goodbytes = $good_bytes
}
function scsi_timer_pending:long(var:long)
%{ /* pure */
struct scsi_cmnd *cmd = (struct scsi_cmnd *)((long)THIS->var);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
THIS->__retvalue = timer_pending(&cmd->eh_timeout); /* FIXME: deref hazard! */
#else
struct request *req;
struct request_queue *rq;
req = (struct request *)kread(&cmd->request);
rq = (struct request_queue *)kread(&req->q);
THIS->__retvalue = timer_pending(&rq->timeout); /* FIXME: deref hazard! */
CATCH_DEREF_FAULT();
#endif
%}
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
}
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