[deliverable/linux.git] / drivers / s390 / scsi / zfcp_scsi.c

/*
 * zfcp device driver
 *
 * Interface to Linux SCSI midlayer.
 *
 * Copyright IBM Corporation 2002, 2008
 */

#include "zfcp_ext.h"
#include <asm/atomic.h>

/* Find start of Sense Information in FCP response unit*/
char *zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
{
	char *fcp_sns_info_ptr;

	fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
	if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
		fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;

	return fcp_sns_info_ptr;
}

static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
{
	struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
	atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
	unit->device = NULL;
	zfcp_erp_unit_failed(unit, 12, NULL);
	zfcp_unit_put(unit);
}

static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
{
	if (sdp->tagged_supported)
		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
	else
		scsi_adjust_queue_depth(sdp, 0, 1);
	return 0;
}

static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
{
	set_host_byte(scpnt, result);
	if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
		zfcp_scsi_dbf_event_result("fail", 4,
			(struct zfcp_adapter*) scpnt->device->host->hostdata[0],
			scpnt, NULL);
	/* return directly */
	scpnt->scsi_done(scpnt);
}

static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
				  void (*done) (struct scsi_cmnd *))
{
	struct zfcp_unit *unit;
	struct zfcp_adapter *adapter;
	int    status;
	int    ret;

	/* reset the status for this request */
	scpnt->result = 0;
	scpnt->host_scribble = NULL;
	scpnt->scsi_done = done;

	/*
	 * figure out adapter and target device
	 * (stored there by zfcp_scsi_slave_alloc)
	 */
	adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
	unit = scpnt->device->hostdata;

	BUG_ON(!adapter || (adapter != unit->port->adapter));
	BUG_ON(!scpnt->scsi_done);

	if (unlikely(!unit)) {
		zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
		return 0;
	}

	status = atomic_read(&unit->status);
	if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) ||
		     !(status & ZFCP_STATUS_COMMON_RUNNING))) {
		zfcp_scsi_command_fail(scpnt, DID_ERROR);
		return 0;;
	}

	ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
					     ZFCP_REQ_AUTO_CLEANUP);
	if (unlikely(ret == -EBUSY))
		return SCSI_MLQUEUE_DEVICE_BUSY;
	else if (unlikely(ret < 0))
		return SCSI_MLQUEUE_HOST_BUSY;

	return ret;
}

static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *adapter,
					  int channel, unsigned int id,
					  unsigned int lun)
{
	struct zfcp_port *port;
	struct zfcp_unit *unit;
	int scsi_lun;

	list_for_each_entry(port, &adapter->port_list_head, list) {
		if (!port->rport || (id != port->rport->scsi_target_id))
			continue;
		list_for_each_entry(unit, &port->unit_list_head, list) {
			scsi_lun = scsilun_to_int(
				(struct scsi_lun *)&unit->fcp_lun);
			if (lun == scsi_lun)
				return unit;
		}
	}

	return NULL;
}

static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
{
	struct zfcp_adapter *adapter;
	struct zfcp_unit *unit;
	unsigned long flags;
	int retval = -ENXIO;

	adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
	if (!adapter)
		goto out;

	read_lock_irqsave(&zfcp_data.config_lock, flags);
	unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
	if (unit &&
	    (atomic_read(&unit->status) & ZFCP_STATUS_UNIT_REGISTERED)) {
		sdp->hostdata = unit;
		unit->device = sdp;
		zfcp_unit_get(unit);
		retval = 0;
	}
	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
out:
	return retval;
}

static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
{
 	struct Scsi_Host *scsi_host;
 	struct zfcp_adapter *adapter;
	struct zfcp_unit *unit;
	struct zfcp_fsf_req *fsf_req;
	unsigned long flags;
	unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
	int retval = SUCCESS;

	scsi_host = scpnt->device->host;
	adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
	unit = scpnt->device->hostdata;

	/* avoid race condition between late normal completion and abort */
	write_lock_irqsave(&adapter->abort_lock, flags);

	/* Check whether corresponding fsf_req is still pending */
	spin_lock(&adapter->req_list_lock);
	fsf_req = zfcp_reqlist_find(adapter, old_req_id);
	spin_unlock(&adapter->req_list_lock);
	if (!fsf_req) {
		write_unlock_irqrestore(&adapter->abort_lock, flags);
		zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
		return retval;
	}
	fsf_req->data = NULL;

	/* don't access old fsf_req after releasing the abort_lock */
	write_unlock_irqrestore(&adapter->abort_lock, flags);

	fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
	if (!fsf_req) {
		zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
					  old_req_id);
		retval = FAILED;
		return retval;
	}

	__wait_event(fsf_req->completion_wq,
		     fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);

	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
		zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
	} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
		zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
	} else {
		zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
		retval = FAILED;
	}
	zfcp_fsf_req_free(fsf_req);

	return retval;
}

static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
					 struct scsi_cmnd *scpnt)
{
	struct zfcp_adapter *adapter = unit->port->adapter;
	struct zfcp_fsf_req *fsf_req;
	int retval = SUCCESS;

	/* issue task management function */
	fsf_req = zfcp_fsf_send_fcp_ctm(adapter, unit, tm_flags, 0);
	if (!fsf_req) {
		zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
		return FAILED;
	}

	__wait_event(fsf_req->completion_wq,
		     fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);

	/*
	 * check completion status of task management function
	 */
	if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
		zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
		retval = FAILED;
	} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
		zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
		retval = FAILED;
	} else
		zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);

	zfcp_fsf_req_free(fsf_req);

	return retval;
}

static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
{
	struct zfcp_unit *unit = scpnt->device->hostdata;

	if (!unit) {
		WARN_ON(1);
		return SUCCESS;
	}
	return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
}

static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
{
	struct zfcp_unit *unit = scpnt->device->hostdata;

	if (!unit) {
		WARN_ON(1);
		return SUCCESS;
	}
	return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
}

static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
{
	struct zfcp_unit *unit;
	struct zfcp_adapter *adapter;

	unit = scpnt->device->hostdata;
	adapter = unit->port->adapter;
	zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
	zfcp_erp_wait(adapter);

	return SUCCESS;
}

int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
{
	struct ccw_dev_id dev_id;

	if (adapter->scsi_host)
		return 0;

	ccw_device_get_id(adapter->ccw_device, &dev_id);
	/* register adapter as SCSI host with mid layer of SCSI stack */
	adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
					     sizeof (struct zfcp_adapter *));
	if (!adapter->scsi_host) {
		dev_err(&adapter->ccw_device->dev,
			"Registering the FCP device with the "
			"SCSI stack failed\n");
		return -EIO;
	}

	/* tell the SCSI stack some characteristics of this adapter */
	adapter->scsi_host->max_id = 1;
	adapter->scsi_host->max_lun = 1;
	adapter->scsi_host->max_channel = 0;
	adapter->scsi_host->unique_id = dev_id.devno;
	adapter->scsi_host->max_cmd_len = 255;
	adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;

	adapter->scsi_host->hostdata[0] = (unsigned long) adapter;

	if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
		scsi_host_put(adapter->scsi_host);
		return -EIO;
	}

	return 0;
}

void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
{
	struct Scsi_Host *shost;
	struct zfcp_port *port;

	shost = adapter->scsi_host;
	if (!shost)
		return;

	read_lock_irq(&zfcp_data.config_lock);
	list_for_each_entry(port, &adapter->port_list_head, list)
		if (port->rport)
			port->rport = NULL;

	read_unlock_irq(&zfcp_data.config_lock);
	fc_remove_host(shost);
	scsi_remove_host(shost);
	scsi_host_put(shost);
	adapter->scsi_host = NULL;

	return;
}

static struct fc_host_statistics*
zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
{
	struct fc_host_statistics *fc_stats;

	if (!adapter->fc_stats) {
		fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
		if (!fc_stats)
			return NULL;
		adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
	}
	memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
	return adapter->fc_stats;
}

static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
				      struct fsf_qtcb_bottom_port *data,
				      struct fsf_qtcb_bottom_port *old)
{
	fc_stats->seconds_since_last_reset =
		data->seconds_since_last_reset - old->seconds_since_last_reset;
	fc_stats->tx_frames = data->tx_frames - old->tx_frames;
	fc_stats->tx_words = data->tx_words - old->tx_words;
	fc_stats->rx_frames = data->rx_frames - old->rx_frames;
	fc_stats->rx_words = data->rx_words - old->rx_words;
	fc_stats->lip_count = data->lip - old->lip;
	fc_stats->nos_count = data->nos - old->nos;
	fc_stats->error_frames = data->error_frames - old->error_frames;
	fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
	fc_stats->link_failure_count = data->link_failure - old->link_failure;
	fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
	fc_stats->loss_of_signal_count =
		data->loss_of_signal - old->loss_of_signal;
	fc_stats->prim_seq_protocol_err_count =
		data->psp_error_counts - old->psp_error_counts;
	fc_stats->invalid_tx_word_count =
		data->invalid_tx_words - old->invalid_tx_words;
	fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
	fc_stats->fcp_input_requests =
		data->input_requests - old->input_requests;
	fc_stats->fcp_output_requests =
		data->output_requests - old->output_requests;
	fc_stats->fcp_control_requests =
		data->control_requests - old->control_requests;
	fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
	fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
}

static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
				   struct fsf_qtcb_bottom_port *data)
{
	fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
	fc_stats->tx_frames = data->tx_frames;
	fc_stats->tx_words = data->tx_words;
	fc_stats->rx_frames = data->rx_frames;
	fc_stats->rx_words = data->rx_words;
	fc_stats->lip_count = data->lip;
	fc_stats->nos_count = data->nos;
	fc_stats->error_frames = data->error_frames;
	fc_stats->dumped_frames = data->dumped_frames;
	fc_stats->link_failure_count = data->link_failure;
	fc_stats->loss_of_sync_count = data->loss_of_sync;
	fc_stats->loss_of_signal_count = data->loss_of_signal;
	fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
	fc_stats->invalid_tx_word_count = data->invalid_tx_words;
	fc_stats->invalid_crc_count = data->invalid_crcs;
	fc_stats->fcp_input_requests = data->input_requests;
	fc_stats->fcp_output_requests = data->output_requests;
	fc_stats->fcp_control_requests = data->control_requests;
	fc_stats->fcp_input_megabytes = data->input_mb;
	fc_stats->fcp_output_megabytes = data->output_mb;
}

static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
{
	struct zfcp_adapter *adapter;
	struct fc_host_statistics *fc_stats;
	struct fsf_qtcb_bottom_port *data;
	int ret;

	adapter = (struct zfcp_adapter *)host->hostdata[0];
	fc_stats = zfcp_init_fc_host_stats(adapter);
	if (!fc_stats)
		return NULL;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return NULL;

	ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
	if (ret) {
		kfree(data);
		return NULL;
	}

	if (adapter->stats_reset &&
	    ((jiffies/HZ - adapter->stats_reset) <
	     data->seconds_since_last_reset))
		zfcp_adjust_fc_host_stats(fc_stats, data,
					  adapter->stats_reset_data);
	else
		zfcp_set_fc_host_stats(fc_stats, data);

	kfree(data);
	return fc_stats;
}

static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
{
	struct zfcp_adapter *adapter;
	struct fsf_qtcb_bottom_port *data;
	int ret;

	adapter = (struct zfcp_adapter *)shost->hostdata[0];
	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return;

	ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
	if (ret)
		kfree(data);
	else {
		adapter->stats_reset = jiffies/HZ;
		kfree(adapter->stats_reset_data);
		adapter->stats_reset_data = data; /* finally freed in
						     adapter_dequeue */
	}
}

static void zfcp_get_host_port_state(struct Scsi_Host *shost)
{
	struct zfcp_adapter *adapter =
		(struct zfcp_adapter *)shost->hostdata[0];
	int status = atomic_read(&adapter->status);

	if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
	    !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
	else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
	else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
		fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
	else
		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
}

static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
{
	rport->dev_loss_tmo = timeout;
}

struct fc_function_template zfcp_transport_functions = {
	.show_starget_port_id = 1,
	.show_starget_port_name = 1,
	.show_starget_node_name = 1,
	.show_rport_supported_classes = 1,
	.show_rport_maxframe_size = 1,
	.show_rport_dev_loss_tmo = 1,
	.show_host_node_name = 1,
	.show_host_port_name = 1,
	.show_host_permanent_port_name = 1,
	.show_host_supported_classes = 1,
	.show_host_supported_speeds = 1,
	.show_host_maxframe_size = 1,
	.show_host_serial_number = 1,
	.get_fc_host_stats = zfcp_get_fc_host_stats,
	.reset_fc_host_stats = zfcp_reset_fc_host_stats,
	.set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
	.get_host_port_state = zfcp_get_host_port_state,
	.show_host_port_state = 1,
	/* no functions registered for following dynamic attributes but
	   directly set by LLDD */
	.show_host_port_type = 1,
	.show_host_speed = 1,
	.show_host_port_id = 1,
	.disable_target_scan = 1,
};

struct zfcp_data zfcp_data = {
	.scsi_host_template = {
		.name			 = "zfcp",
		.module			 = THIS_MODULE,
		.proc_name		 = "zfcp",
		.slave_alloc		 = zfcp_scsi_slave_alloc,
		.slave_configure	 = zfcp_scsi_slave_configure,
		.slave_destroy		 = zfcp_scsi_slave_destroy,
		.queuecommand		 = zfcp_scsi_queuecommand,
		.eh_abort_handler	 = zfcp_scsi_eh_abort_handler,
		.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
		.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
		.eh_host_reset_handler	 = zfcp_scsi_eh_host_reset_handler,
		.can_queue		 = 4096,
		.this_id		 = -1,
		.sg_tablesize		 = ZFCP_MAX_SBALES_PER_REQ,
		.cmd_per_lun		 = 1,
		.use_clustering		 = 1,
		.sdev_attrs		 = zfcp_sysfs_sdev_attrs,
		.max_sectors		 = (ZFCP_MAX_SBALES_PER_REQ * 8),
		.shost_attrs		 = zfcp_sysfs_shost_attrs,
	},
};
Commit	Line	Data
41fa2ada	1	/*
553448f6	2	* zfcp device driver
1da177e4	3	*
553448f6	4	* Interface to Linux SCSI midlayer.
41fa2ada	5	*
553448f6	6	* Copyright IBM Corporation 2002, 2008
1da177e4 LT	7	*/
1da177e4 LT	8
1da177e4	9	#include "zfcp_ext.h"
5f852be9	10	#include <asm/atomic.h>
1da177e4	11
1da177e4	12	/* Find start of Sense Information in FCP response unit*/
f76af7d7	13	char zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu fcp_rsp_iu)
1da177e4 LT	14	{
	15	char *fcp_sns_info_ptr;
	16
f76af7d7	17	fcp_sns_info_ptr = (unsigned char *) &fcp_rsp_iu[1];
1da177e4	18	if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
f76af7d7	19	fcp_sns_info_ptr += fcp_rsp_iu->fcp_rsp_len;
1da177e4 LT	20
	21	return fcp_sns_info_ptr;
	22	}
	23
f6c0e7a7	24	static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
1da177e4 LT	25	{
1da177e4 LT	26	struct zfcp_unit unit = (struct zfcp_unit ) sdpnt->hostdata;
26816f1c CS	27	atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
	28	unit->device = NULL;
	29	zfcp_erp_unit_failed(unit, 12, NULL);
	30	zfcp_unit_put(unit);
1da177e4 LT	31	}
1da177e4 LT	32
f76af7d7	33	static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
1da177e4 LT	34	{
1da177e4 LT	35	if (sdp->tagged_supported)
f76af7d7	36	scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, 32);
1da177e4 LT	37	else
	38	scsi_adjust_queue_depth(sdp, 0, 1);
	39	return 0;
	40	}
	41
f76af7d7	42	static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
1da177e4	43	{
feac6a07	44	set_host_byte(scpnt, result);
8a36e453 MS	45	if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
	46	zfcp_scsi_dbf_event_result("fail", 4,
	47	(struct zfcp_adapter*) scpnt->device->host->hostdata[0],
ed829ad6	48	scpnt, NULL);
1da177e4 LT	49	/* return directly */
	50	scpnt->scsi_done(scpnt);
	51	}
	52
f76af7d7 MP	53	static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
f76af7d7 MP	54	void (done) (struct scsi_cmnd ))
1da177e4 LT	55	{
	56	struct zfcp_unit *unit;
	57	struct zfcp_adapter *adapter;
f76af7d7 MP	58	int status;
f76af7d7 MP	59	int ret;
1da177e4 LT	60
	61	/* reset the status for this request */
	62	scpnt->result = 0;
	63	scpnt->host_scribble = NULL;
	64	scpnt->scsi_done = done;
	65
	66	/*
	67	* figure out adapter and target device
	68	* (stored there by zfcp_scsi_slave_alloc)
	69	*/
	70	adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
f76af7d7 MP	71	unit = scpnt->device->hostdata;
	72
	73	BUG_ON(!adapter \|\| (adapter != unit->port->adapter));
	74	BUG_ON(!scpnt->scsi_done);
	75
	76	if (unlikely(!unit)) {
	77	zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
	78	return 0;
	79	}
	80
	81	status = atomic_read(&unit->status);
	82	if (unlikely((status & ZFCP_STATUS_COMMON_ERP_FAILED) \|\|
	83	!(status & ZFCP_STATUS_COMMON_RUNNING))) {
	84	zfcp_scsi_command_fail(scpnt, DID_ERROR);
	85	return 0;;
	86	}
	87
	88	ret = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, 0,
	89	ZFCP_REQ_AUTO_CLEANUP);
	90	if (unlikely(ret == -EBUSY))
f7a65e92	91	return SCSI_MLQUEUE_DEVICE_BUSY;
f76af7d7 MP	92	else if (unlikely(ret < 0))
f76af7d7 MP	93	return SCSI_MLQUEUE_HOST_BUSY;
1da177e4	94
f76af7d7	95	return ret;
1da177e4 LT	96	}
1da177e4 LT	97
f76af7d7 MP	98	static struct zfcp_unit zfcp_unit_lookup(struct zfcp_adapter adapter,
	99	int channel, unsigned int id,
	100	unsigned int lun)
1da177e4 LT	101	{
1da177e4 LT	102	struct zfcp_port *port;
f76af7d7	103	struct zfcp_unit *unit;
0406289e	104	int scsi_lun;
1da177e4 LT	105
1da177e4 LT	106	list_for_each_entry(port, &adapter->port_list_head, list) {
3859f6a2	107	if (!port->rport \|\| (id != port->rport->scsi_target_id))
1da177e4	108	continue;
0406289e CS	109	list_for_each_entry(unit, &port->unit_list_head, list) {
	110	scsi_lun = scsilun_to_int(
	111	(struct scsi_lun *)&unit->fcp_lun);
	112	if (lun == scsi_lun)
f76af7d7	113	return unit;
0406289e	114	}
1da177e4	115	}
f76af7d7 MP	116
	117	return NULL;
	118	}
	119
	120	static int zfcp_scsi_slave_alloc(struct scsi_device *sdp)
	121	{
	122	struct zfcp_adapter *adapter;
	123	struct zfcp_unit *unit;
	124	unsigned long flags;
	125	int retval = -ENXIO;
	126
	127	adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
	128	if (!adapter)
	129	goto out;
	130
	131	read_lock_irqsave(&zfcp_data.config_lock, flags);
	132	unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
	133	if (unit &&
	134	(atomic_read(&unit->status) & ZFCP_STATUS_UNIT_REGISTERED)) {
	135	sdp->hostdata = unit;
	136	unit->device = sdp;
	137	zfcp_unit_get(unit);
	138	retval = 0;
	139	}
	140	read_unlock_irqrestore(&zfcp_data.config_lock, flags);
	141	out:
1da177e4 LT	142	return retval;
	143	}
	144
2b67fc46	145	static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
1da177e4	146	{
059c97d0 AH	147	struct Scsi_Host *scsi_host;
	148	struct zfcp_adapter *adapter;
	149	struct zfcp_unit *unit;
4eff4a36	150	struct zfcp_fsf_req *fsf_req;
1da177e4	151	unsigned long flags;
f76af7d7	152	unsigned long old_req_id = (unsigned long) scpnt->host_scribble;
4eff4a36	153	int retval = SUCCESS;
059c97d0 AH	154
	155	scsi_host = scpnt->device->host;
	156	adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
f76af7d7	157	unit = scpnt->device->hostdata;
1da177e4	158
059c97d0	159	/* avoid race condition between late normal completion and abort */
1da177e4 LT	160	write_lock_irqsave(&adapter->abort_lock, flags);
1da177e4 LT	161
4eff4a36 AH	162	/* Check whether corresponding fsf_req is still pending */
4eff4a36 AH	163	spin_lock(&adapter->req_list_lock);
f76af7d7	164	fsf_req = zfcp_reqlist_find(adapter, old_req_id);
4eff4a36 AH	165	spin_unlock(&adapter->req_list_lock);
4eff4a36 AH	166	if (!fsf_req) {
1da177e4	167	write_unlock_irqrestore(&adapter->abort_lock, flags);
4eff4a36	168	zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
f76af7d7	169	return retval;
1da177e4	170	}
c41f8cbd	171	fsf_req->data = NULL;
1da177e4	172
4eff4a36	173	/* don't access old fsf_req after releasing the abort_lock */
1da177e4	174	write_unlock_irqrestore(&adapter->abort_lock, flags);
4eff4a36 AH	175
	176	fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
	177	if (!fsf_req) {
ed829ad6	178	zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
4eff4a36	179	old_req_id);
1da177e4	180	retval = FAILED;
f76af7d7	181	return retval;
1da177e4 LT	182	}
1da177e4 LT	183
4eff4a36 AH	184	__wait_event(fsf_req->completion_wq,
4eff4a36 AH	185	fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
059c97d0	186
4eff4a36 AH	187	if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
4eff4a36 AH	188	zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
4eff4a36 AH	189	} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
4eff4a36 AH	190	zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
1da177e4	191	} else {
4eff4a36	192	zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
1da177e4	193	retval = FAILED;
1da177e4	194	}
4eff4a36	195	zfcp_fsf_req_free(fsf_req);
1da177e4	196
f76af7d7	197	return retval;
1da177e4 LT	198	}
1da177e4 LT	199
f76af7d7 MP	200	static int zfcp_task_mgmt_function(struct zfcp_unit *unit, u8 tm_flags,
f76af7d7 MP	201	struct scsi_cmnd *scpnt)
1da177e4 LT	202	{
1da177e4 LT	203	struct zfcp_adapter *adapter = unit->port->adapter;
1da177e4	204	struct zfcp_fsf_req *fsf_req;
f76af7d7	205	int retval = SUCCESS;
1da177e4 LT	206
1da177e4 LT	207	/* issue task management function */
c41f8cbd	208	fsf_req = zfcp_fsf_send_fcp_ctm(adapter, unit, tm_flags, 0);
1da177e4	209	if (!fsf_req) {
8a36e453	210	zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
f76af7d7	211	return FAILED;
1da177e4 LT	212	}
1da177e4 LT	213
77eb1699 AH	214	__wait_event(fsf_req->completion_wq,
	215	fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
	216
8a36e453 MS	217	/*
	218	* check completion status of task management function
	219	*/
	220	if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
	221	zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
f76af7d7	222	retval = FAILED;
8a36e453 MS	223	} else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
8a36e453 MS	224	zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
f76af7d7	225	retval = FAILED;
8a36e453 MS	226	} else
8a36e453 MS	227	zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
77eb1699 AH	228
77eb1699 AH	229	zfcp_fsf_req_free(fsf_req);
f76af7d7	230
1da177e4 LT	231	return retval;
	232	}
	233
f76af7d7 MP	234	static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
	235	{
	236	struct zfcp_unit *unit = scpnt->device->hostdata;
	237
	238	if (!unit) {
	239	WARN_ON(1);
	240	return SUCCESS;
	241	}
	242	return zfcp_task_mgmt_function(unit, FCP_LOGICAL_UNIT_RESET, scpnt);
	243	}
	244
	245	static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
	246	{
	247	struct zfcp_unit *unit = scpnt->device->hostdata;
	248
	249	if (!unit) {
	250	WARN_ON(1);
	251	return SUCCESS;
	252	}
	253	return zfcp_task_mgmt_function(unit, FCP_TARGET_RESET, scpnt);
	254	}
	255
2b67fc46	256	static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
1da177e4	257	{
f6c0e7a7 AH	258	struct zfcp_unit *unit;
f6c0e7a7 AH	259	struct zfcp_adapter *adapter;
1da177e4	260
f76af7d7	261	unit = scpnt->device->hostdata;
f6c0e7a7	262	adapter = unit->port->adapter;
1f6f7129	263	zfcp_erp_adapter_reopen(adapter, 0, 141, scpnt);
81654286	264	zfcp_erp_wait(adapter);
1da177e4	265
810f1e3e	266	return SUCCESS;
1da177e4 LT	267	}
1da177e4 LT	268
f76af7d7	269	int zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
1da177e4	270	{
f76af7d7	271	struct ccw_dev_id dev_id;
1da177e4	272
9f28745a	273	if (adapter->scsi_host)
f76af7d7	274	return 0;
9f28745a	275
f76af7d7	276	ccw_device_get_id(adapter->ccw_device, &dev_id);
1da177e4 LT	277	/* register adapter as SCSI host with mid layer of SCSI stack */
	278	adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
	279	sizeof (struct zfcp_adapter *));
	280	if (!adapter->scsi_host) {
553448f6	281	dev_err(&adapter->ccw_device->dev,
ff3b24fa CS	282	"Registering the FCP device with the "
ff3b24fa CS	283	"SCSI stack failed\n");
f76af7d7	284	return -EIO;
1da177e4	285	}
1da177e4 LT	286
	287	/* tell the SCSI stack some characteristics of this adapter */
	288	adapter->scsi_host->max_id = 1;
	289	adapter->scsi_host->max_lun = 1;
	290	adapter->scsi_host->max_channel = 0;
f76af7d7 MP	291	adapter->scsi_host->unique_id = dev_id.devno;
f76af7d7 MP	292	adapter->scsi_host->max_cmd_len = 255;
dd52e0ea	293	adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
1da177e4	294
1da177e4 LT	295	adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
	296
	297	if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
	298	scsi_host_put(adapter->scsi_host);
f76af7d7	299	return -EIO;
1da177e4	300	}
f76af7d7 MP	301
f76af7d7 MP	302	return 0;
1da177e4 LT	303	}
1da177e4 LT	304
f76af7d7	305	void zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
1da177e4 LT	306	{
1da177e4 LT	307	struct Scsi_Host *shost;
13e1e1f0	308	struct zfcp_port *port;
1da177e4 LT	309
	310	shost = adapter->scsi_host;
	311	if (!shost)
	312	return;
f76af7d7	313
13e1e1f0 AH	314	read_lock_irq(&zfcp_data.config_lock);
	315	list_for_each_entry(port, &adapter->port_list_head, list)
	316	if (port->rport)
	317	port->rport = NULL;
f76af7d7	318
13e1e1f0	319	read_unlock_irq(&zfcp_data.config_lock);
3859f6a2	320	fc_remove_host(shost);
1da177e4 LT	321	scsi_remove_host(shost);
	322	scsi_host_put(shost);
	323	adapter->scsi_host = NULL;
1da177e4 LT	324
	325	return;
	326	}
	327
f6cd94b1 AH	328	static struct fc_host_statistics*
f6cd94b1 AH	329	zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
1da177e4	330	{
f6cd94b1	331	struct fc_host_statistics *fc_stats;
1da177e4	332
f6cd94b1 AH	333	if (!adapter->fc_stats) {
	334	fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
	335	if (!fc_stats)
	336	return NULL;
	337	adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
	338	}
	339	memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
	340	return adapter->fc_stats;
1da177e4 LT	341	}
1da177e4 LT	342
f76af7d7 MP	343	static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
	344	struct fsf_qtcb_bottom_port *data,
	345	struct fsf_qtcb_bottom_port *old)
1da177e4	346	{
f76af7d7 MP	347	fc_stats->seconds_since_last_reset =
f76af7d7 MP	348	data->seconds_since_last_reset - old->seconds_since_last_reset;
f6cd94b1 AH	349	fc_stats->tx_frames = data->tx_frames - old->tx_frames;
	350	fc_stats->tx_words = data->tx_words - old->tx_words;
	351	fc_stats->rx_frames = data->rx_frames - old->rx_frames;
	352	fc_stats->rx_words = data->rx_words - old->rx_words;
	353	fc_stats->lip_count = data->lip - old->lip;
	354	fc_stats->nos_count = data->nos - old->nos;
	355	fc_stats->error_frames = data->error_frames - old->error_frames;
	356	fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
	357	fc_stats->link_failure_count = data->link_failure - old->link_failure;
	358	fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
f76af7d7 MP	359	fc_stats->loss_of_signal_count =
	360	data->loss_of_signal - old->loss_of_signal;
	361	fc_stats->prim_seq_protocol_err_count =
	362	data->psp_error_counts - old->psp_error_counts;
	363	fc_stats->invalid_tx_word_count =
	364	data->invalid_tx_words - old->invalid_tx_words;
f6cd94b1	365	fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
f76af7d7 MP	366	fc_stats->fcp_input_requests =
	367	data->input_requests - old->input_requests;
	368	fc_stats->fcp_output_requests =
	369	data->output_requests - old->output_requests;
	370	fc_stats->fcp_control_requests =
	371	data->control_requests - old->control_requests;
f6cd94b1 AH	372	fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
	373	fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
	374	}
1da177e4	375
f76af7d7 MP	376	static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
f76af7d7 MP	377	struct fsf_qtcb_bottom_port *data)
f6cd94b1 AH	378	{
	379	fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
	380	fc_stats->tx_frames = data->tx_frames;
	381	fc_stats->tx_words = data->tx_words;
	382	fc_stats->rx_frames = data->rx_frames;
	383	fc_stats->rx_words = data->rx_words;
	384	fc_stats->lip_count = data->lip;
	385	fc_stats->nos_count = data->nos;
	386	fc_stats->error_frames = data->error_frames;
	387	fc_stats->dumped_frames = data->dumped_frames;
	388	fc_stats->link_failure_count = data->link_failure;
	389	fc_stats->loss_of_sync_count = data->loss_of_sync;
	390	fc_stats->loss_of_signal_count = data->loss_of_signal;
	391	fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
	392	fc_stats->invalid_tx_word_count = data->invalid_tx_words;
	393	fc_stats->invalid_crc_count = data->invalid_crcs;
	394	fc_stats->fcp_input_requests = data->input_requests;
	395	fc_stats->fcp_output_requests = data->output_requests;
	396	fc_stats->fcp_control_requests = data->control_requests;
	397	fc_stats->fcp_input_megabytes = data->input_mb;
	398	fc_stats->fcp_output_megabytes = data->output_mb;
	399	}
	400
f76af7d7	401	static struct fc_host_statistics zfcp_get_fc_host_stats(struct Scsi_Host host)
f6cd94b1 AH	402	{
	403	struct zfcp_adapter *adapter;
	404	struct fc_host_statistics *fc_stats;
	405	struct fsf_qtcb_bottom_port *data;
	406	int ret;
	407
f76af7d7	408	adapter = (struct zfcp_adapter *)host->hostdata[0];
f6cd94b1 AH	409	fc_stats = zfcp_init_fc_host_stats(adapter);
	410	if (!fc_stats)
	411	return NULL;
	412
ec4081c6	413	data = kzalloc(sizeof(*data), GFP_KERNEL);
f6cd94b1 AH	414	if (!data)
f6cd94b1 AH	415	return NULL;
f6cd94b1	416
52ef11a7	417	ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
f6cd94b1 AH	418	if (ret) {
f6cd94b1 AH	419	kfree(data);
f76af7d7	420	return NULL;
f6cd94b1 AH	421	}
	422
	423	if (adapter->stats_reset &&
	424	((jiffies/HZ - adapter->stats_reset) <
f76af7d7	425	data->seconds_since_last_reset))
f6cd94b1 AH	426	zfcp_adjust_fc_host_stats(fc_stats, data,
f6cd94b1 AH	427	adapter->stats_reset_data);
f76af7d7	428	else
f6cd94b1 AH	429	zfcp_set_fc_host_stats(fc_stats, data);
	430
	431	kfree(data);
	432	return fc_stats;
1da177e4 LT	433	}
1da177e4 LT	434
f76af7d7	435	static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
1da177e4	436	{
f6cd94b1	437	struct zfcp_adapter *adapter;
f76af7d7	438	struct fsf_qtcb_bottom_port *data;
f6cd94b1	439	int ret;
1da177e4	440
f6cd94b1	441	adapter = (struct zfcp_adapter *)shost->hostdata[0];
ec4081c6	442	data = kzalloc(sizeof(*data), GFP_KERNEL);
f6cd94b1 AH	443	if (!data)
f6cd94b1 AH	444	return;
f6cd94b1	445
52ef11a7	446	ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
f76af7d7	447	if (ret)
83f6d6d7	448	kfree(data);
f76af7d7	449	else {
f6cd94b1	450	adapter->stats_reset = jiffies/HZ;
f76af7d7	451	kfree(adapter->stats_reset_data);
f6cd94b1	452	adapter->stats_reset_data = data; /* finally freed in
f76af7d7	453	adapter_dequeue */
f6cd94b1	454	}
1da177e4 LT	455	}
1da177e4 LT	456
85a82392 SS	457	static void zfcp_get_host_port_state(struct Scsi_Host *shost)
	458	{
	459	struct zfcp_adapter *adapter =
	460	(struct zfcp_adapter *)shost->hostdata[0];
	461	int status = atomic_read(&adapter->status);
	462
	463	if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
	464	!(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
	465	fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
	466	else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
	467	fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
	468	else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
	469	fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
	470	else
	471	fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
	472	}
	473
338151e0 AH	474	static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
	475	{
	476	rport->dev_loss_tmo = timeout;
	477	}
	478
1da177e4	479	struct fc_function_template zfcp_transport_functions = {
1da177e4 LT	480	.show_starget_port_id = 1,
	481	.show_starget_port_name = 1,
	482	.show_starget_node_name = 1,
3859f6a2	483	.show_rport_supported_classes = 1,
75bfc283	484	.show_rport_maxframe_size = 1,
338151e0	485	.show_rport_dev_loss_tmo = 1,
3859f6a2 AH	486	.show_host_node_name = 1,
3859f6a2 AH	487	.show_host_port_name = 1,
ad757cdf	488	.show_host_permanent_port_name = 1,
3859f6a2	489	.show_host_supported_classes = 1,
ad757cdf	490	.show_host_supported_speeds = 1,
13e1e1f0	491	.show_host_maxframe_size = 1,
3859f6a2	492	.show_host_serial_number = 1,
f6cd94b1 AH	493	.get_fc_host_stats = zfcp_get_fc_host_stats,
f6cd94b1 AH	494	.reset_fc_host_stats = zfcp_reset_fc_host_stats,
338151e0	495	.set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
85a82392 SS	496	.get_host_port_state = zfcp_get_host_port_state,
85a82392 SS	497	.show_host_port_state = 1,
f6cd94b1 AH	498	/* no functions registered for following dynamic attributes but
f6cd94b1 AH	499	directly set by LLDD */
ad757cdf	500	.show_host_port_type = 1,
13e1e1f0 AH	501	.show_host_speed = 1,
13e1e1f0 AH	502	.show_host_port_id = 1,
52ef11a7	503	.disable_target_scan = 1,
1da177e4 LT	504	};
1da177e4 LT	505
f76af7d7 MP	506	struct zfcp_data zfcp_data = {
	507	.scsi_host_template = {
	508	.name = "zfcp",
	509	.module = THIS_MODULE,
	510	.proc_name = "zfcp",
	511	.slave_alloc = zfcp_scsi_slave_alloc,
	512	.slave_configure = zfcp_scsi_slave_configure,
	513	.slave_destroy = zfcp_scsi_slave_destroy,
	514	.queuecommand = zfcp_scsi_queuecommand,
	515	.eh_abort_handler = zfcp_scsi_eh_abort_handler,
	516	.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
	517	.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
	518	.eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
	519	.can_queue = 4096,
	520	.this_id = -1,
	521	.sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
	522	.cmd_per_lun = 1,
	523	.use_clustering = 1,
	524	.sdev_attrs = zfcp_sysfs_sdev_attrs,
	525	.max_sectors = (ZFCP_MAX_SBALES_PER_REQ * 8),
60221920	526	.shost_attrs = zfcp_sysfs_shost_attrs,
f76af7d7 MP	527	},
f76af7d7 MP	528	};