[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / scsi / zfcp_ccw.c

/*
 * zfcp device driver
 *
 * Registration and callback for the s390 common I/O layer.
 *
 * Copyright IBM Corporation 2002, 2008
 */

#include "zfcp_ext.h"

/**
 * zfcp_ccw_probe - probe function of zfcp driver
 * @ccw_device: pointer to belonging ccw device
 *
 * This function gets called by the common i/o layer and sets up the initial
 * data structures for each fcp adapter, which was detected by the system.
 * Also the sysfs files for this adapter will be created by this function.
 * In addition the nameserver port will be added to the ports of the adapter
 * and its sysfs representation will be created too.
 */
static int zfcp_ccw_probe(struct ccw_device *ccw_device)
{
	struct zfcp_adapter *adapter;
	int retval = 0;

	down(&zfcp_data.config_sema);
	adapter = zfcp_adapter_enqueue(ccw_device);
	if (!adapter) {
		dev_err(&ccw_device->dev,
			"Setup of data structures failed.\n");
		retval = -EINVAL;
	}
	up(&zfcp_data.config_sema);
	return retval;
}

/**
 * zfcp_ccw_remove - remove function of zfcp driver
 * @ccw_device: pointer to belonging ccw device
 *
 * This function gets called by the common i/o layer and removes an adapter
 * from the system. Task of this function is to get rid of all units and
 * ports that belong to this adapter. And in addition all resources of this
 * adapter will be freed too.
 */
static void zfcp_ccw_remove(struct ccw_device *ccw_device)
{
	struct zfcp_adapter *adapter;
	struct zfcp_port *port, *p;
	struct zfcp_unit *unit, *u;

	ccw_device_set_offline(ccw_device);
	down(&zfcp_data.config_sema);
	adapter = dev_get_drvdata(&ccw_device->dev);

	write_lock_irq(&zfcp_data.config_lock);
	list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
		list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
			list_move(&unit->list, &port->unit_remove_lh);
			atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
					&unit->status);
		}
		list_move(&port->list, &adapter->port_remove_lh);
		atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
	}
	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
	write_unlock_irq(&zfcp_data.config_lock);

	list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) {
		list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) {
			if (atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
				&unit->status))
				scsi_remove_device(unit->device);
			zfcp_unit_dequeue(unit);
		}
		zfcp_port_dequeue(port);
	}
	zfcp_adapter_wait(adapter);
	zfcp_adapter_dequeue(adapter);

	up(&zfcp_data.config_sema);
}

/**
 * zfcp_ccw_set_online - set_online function of zfcp driver
 * @ccw_device: pointer to belonging ccw device
 *
 * This function gets called by the common i/o layer and sets an adapter
 * into state online. Setting an fcp device online means that it will be
 * registered with the SCSI stack, that the QDIO queues will be set up
 * and that the adapter will be opened (asynchronously).
 */
static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
{
	struct zfcp_adapter *adapter;
	int retval;

	down(&zfcp_data.config_sema);
	adapter = dev_get_drvdata(&ccw_device->dev);

	retval = zfcp_erp_thread_setup(adapter);
	if (retval)
		goto out;

	retval = zfcp_adapter_scsi_register(adapter);
	if (retval)
		goto out_scsi_register;

	/* initialize request counter */
	BUG_ON(!zfcp_reqlist_isempty(adapter));
	adapter->req_no = 0;

	zfcp_erp_modify_adapter_status(adapter, 10, NULL,
				       ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
				NULL);
	zfcp_erp_wait(adapter);
	goto out;

 out_scsi_register:
	zfcp_erp_thread_kill(adapter);
 out:
	up(&zfcp_data.config_sema);
	return retval;
}

/**
 * zfcp_ccw_set_offline - set_offline function of zfcp driver
 * @ccw_device: pointer to belonging ccw device
 *
 * This function gets called by the common i/o layer and sets an adapter
 * into state offline.
 */
static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
{
	struct zfcp_adapter *adapter;

	down(&zfcp_data.config_sema);
	adapter = dev_get_drvdata(&ccw_device->dev);
	zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
	zfcp_erp_wait(adapter);
	zfcp_erp_thread_kill(adapter);
	up(&zfcp_data.config_sema);
	return 0;
}

/**
 * zfcp_ccw_notify - ccw notify function
 * @ccw_device: pointer to belonging ccw device
 * @event: indicates if adapter was detached or attached
 *
 * This function gets called by the common i/o layer if an adapter has gone
 * or reappeared.
 */
static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
{
	struct zfcp_adapter *adapter;

	down(&zfcp_data.config_sema);
	adapter = dev_get_drvdata(&ccw_device->dev);
	switch (event) {
	case CIO_GONE:
		dev_warn(&adapter->ccw_device->dev, "device gone\n");
		zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
		break;
	case CIO_NO_PATH:
		dev_warn(&adapter->ccw_device->dev, "no path\n");
		zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
		break;
	case CIO_OPER:
		dev_info(&adapter->ccw_device->dev, "operational again\n");
		zfcp_erp_modify_adapter_status(adapter, 11, NULL,
					       ZFCP_STATUS_COMMON_RUNNING,
					       ZFCP_SET);
		zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
					89, NULL);
		break;
	}
	zfcp_erp_wait(adapter);
	up(&zfcp_data.config_sema);
	return 1;
}

/**
 * zfcp_ccw_shutdown - handle shutdown from cio
 * @cdev: device for adapter to shutdown.
 */
static void zfcp_ccw_shutdown(struct ccw_device *cdev)
{
	struct zfcp_adapter *adapter;

	down(&zfcp_data.config_sema);
	adapter = dev_get_drvdata(&cdev->dev);
	zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
	zfcp_erp_wait(adapter);
	up(&zfcp_data.config_sema);
}

static struct ccw_device_id zfcp_ccw_device_id[] = {
	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
	{},
};

MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);

static struct ccw_driver zfcp_ccw_driver = {
	.owner       = THIS_MODULE,
	.name        = "zfcp",
	.ids         = zfcp_ccw_device_id,
	.probe       = zfcp_ccw_probe,
	.remove      = zfcp_ccw_remove,
	.set_online  = zfcp_ccw_set_online,
	.set_offline = zfcp_ccw_set_offline,
	.notify      = zfcp_ccw_notify,
	.shutdown    = zfcp_ccw_shutdown,
};

/**
 * zfcp_ccw_register - ccw register function
 *
 * Registers the driver at the common i/o layer. This function will be called
 * at module load time/system start.
 */
int __init zfcp_ccw_register(void)
{
	return ccw_driver_register(&zfcp_ccw_driver);
}
Commit	Line	Data
1da177e4	1	/*
fa04c281	2	* zfcp device driver
1da177e4	3	*
fa04c281	4	* Registration and callback for the s390 common I/O layer.
1da177e4	5	*
fa04c281	6	* Copyright IBM Corporation 2002, 2008
1da177e4 LT	7	*/
1da177e4 LT	8
1da177e4 LT	9	#include "zfcp_ext.h"
1da177e4 LT	10
1da177e4 LT	11	/**
	12	* zfcp_ccw_probe - probe function of zfcp driver
	13	* @ccw_device: pointer to belonging ccw device
	14	*
	15	* This function gets called by the common i/o layer and sets up the initial
	16	* data structures for each fcp adapter, which was detected by the system.
	17	* Also the sysfs files for this adapter will be created by this function.
	18	* In addition the nameserver port will be added to the ports of the adapter
	19	* and its sysfs representation will be created too.
	20	*/
fa04c281	21	static int zfcp_ccw_probe(struct ccw_device *ccw_device)
1da177e4 LT	22	{
	23	struct zfcp_adapter *adapter;
	24	int retval = 0;
	25
	26	down(&zfcp_data.config_sema);
	27	adapter = zfcp_adapter_enqueue(ccw_device);
fa04c281 CS	28	if (!adapter) {
	29	dev_err(&ccw_device->dev,
	30	"Setup of data structures failed.\n");
1da177e4	31	retval = -EINVAL;
fa04c281	32	}
1da177e4 LT	33	up(&zfcp_data.config_sema);
	34	return retval;
	35	}
	36
	37	/**
	38	* zfcp_ccw_remove - remove function of zfcp driver
	39	* @ccw_device: pointer to belonging ccw device
	40	*
	41	* This function gets called by the common i/o layer and removes an adapter
	42	* from the system. Task of this function is to get rid of all units and
	43	* ports that belong to this adapter. And in addition all resources of this
	44	* adapter will be freed too.
	45	*/
fa04c281	46	static void zfcp_ccw_remove(struct ccw_device *ccw_device)
1da177e4 LT	47	{
	48	struct zfcp_adapter *adapter;
	49	struct zfcp_port port, p;
	50	struct zfcp_unit unit, u;
	51
	52	ccw_device_set_offline(ccw_device);
	53	down(&zfcp_data.config_sema);
	54	adapter = dev_get_drvdata(&ccw_device->dev);
	55
1da177e4 LT	56	write_lock_irq(&zfcp_data.config_lock);
	57	list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
	58	list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
	59	list_move(&unit->list, &port->unit_remove_lh);
	60	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
	61	&unit->status);
	62	}
	63	list_move(&port->list, &adapter->port_remove_lh);
	64	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
	65	}
	66	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
	67	write_unlock_irq(&zfcp_data.config_lock);
	68
	69	list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) {
	70	list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) {
e39c8877 CS	71	if (atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
	72	&unit->status))
	73	scsi_remove_device(unit->device);
1da177e4 LT	74	zfcp_unit_dequeue(unit);
	75	}
	76	zfcp_port_dequeue(port);
	77	}
	78	zfcp_adapter_wait(adapter);
	79	zfcp_adapter_dequeue(adapter);
	80
	81	up(&zfcp_data.config_sema);
	82	}
	83
	84	/**
	85	* zfcp_ccw_set_online - set_online function of zfcp driver
	86	* @ccw_device: pointer to belonging ccw device
	87	*
	88	* This function gets called by the common i/o layer and sets an adapter
	89	* into state online. Setting an fcp device online means that it will be
	90	* registered with the SCSI stack, that the QDIO queues will be set up
	91	* and that the adapter will be opened (asynchronously).
	92	*/
fa04c281	93	static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
1da177e4 LT	94	{
	95	struct zfcp_adapter *adapter;
	96	int retval;
	97
	98	down(&zfcp_data.config_sema);
	99	adapter = dev_get_drvdata(&ccw_device->dev);
	100
1da177e4	101	retval = zfcp_erp_thread_setup(adapter);
fa04c281	102	if (retval)
ff17a29d	103	goto out;
1da177e4 LT	104
	105	retval = zfcp_adapter_scsi_register(adapter);
	106	if (retval)
	107	goto out_scsi_register;
fea9d6c7 VS	108
	109	/* initialize request counter */
	110	BUG_ON(!zfcp_reqlist_isempty(adapter));
	111	adapter->req_no = 0;
	112
1f6f7129	113	zfcp_erp_modify_adapter_status(adapter, 10, NULL,
698ec016	114	ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
1f6f7129 MP	115	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, 85,
1f6f7129 MP	116	NULL);
1da177e4 LT	117	zfcp_erp_wait(adapter);
	118	goto out;
	119
	120	out_scsi_register:
	121	zfcp_erp_thread_kill(adapter);
1da177e4 LT	122	out:
	123	up(&zfcp_data.config_sema);
	124	return retval;
	125	}
	126
	127	/**
	128	* zfcp_ccw_set_offline - set_offline function of zfcp driver
	129	* @ccw_device: pointer to belonging ccw device
	130	*
	131	* This function gets called by the common i/o layer and sets an adapter
9f28745a	132	* into state offline.
1da177e4	133	*/
fa04c281	134	static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
1da177e4 LT	135	{
	136	struct zfcp_adapter *adapter;
	137
	138	down(&zfcp_data.config_sema);
	139	adapter = dev_get_drvdata(&ccw_device->dev);
1f6f7129	140	zfcp_erp_adapter_shutdown(adapter, 0, 86, NULL);
1da177e4	141	zfcp_erp_wait(adapter);
1da177e4	142	zfcp_erp_thread_kill(adapter);
1da177e4 LT	143	up(&zfcp_data.config_sema);
	144	return 0;
	145	}
	146
	147	/**
fa04c281	148	* zfcp_ccw_notify - ccw notify function
1da177e4 LT	149	* @ccw_device: pointer to belonging ccw device
	150	* @event: indicates if adapter was detached or attached
	151	*
	152	* This function gets called by the common i/o layer if an adapter has gone
	153	* or reappeared.
	154	*/
fa04c281	155	static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
1da177e4 LT	156	{
	157	struct zfcp_adapter *adapter;
	158
	159	down(&zfcp_data.config_sema);
	160	adapter = dev_get_drvdata(&ccw_device->dev);
	161	switch (event) {
	162	case CIO_GONE:
fa04c281	163	dev_warn(&adapter->ccw_device->dev, "device gone\n");
1f6f7129	164	zfcp_erp_adapter_shutdown(adapter, 0, 87, NULL);
1da177e4 LT	165	break;
1da177e4 LT	166	case CIO_NO_PATH:
fa04c281	167	dev_warn(&adapter->ccw_device->dev, "no path\n");
1f6f7129	168	zfcp_erp_adapter_shutdown(adapter, 0, 88, NULL);
1da177e4 LT	169	break;
1da177e4 LT	170	case CIO_OPER:
fa04c281	171	dev_info(&adapter->ccw_device->dev, "operational again\n");
1f6f7129	172	zfcp_erp_modify_adapter_status(adapter, 11, NULL,
1da177e4 LT	173	ZFCP_STATUS_COMMON_RUNNING,
1da177e4 LT	174	ZFCP_SET);
1f6f7129 MP	175	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
1f6f7129 MP	176	89, NULL);
1da177e4 LT	177	break;
	178	}
	179	zfcp_erp_wait(adapter);
	180	up(&zfcp_data.config_sema);
	181	return 1;
	182	}
	183
	184	/**
fa04c281 CS	185	* zfcp_ccw_shutdown - handle shutdown from cio
fa04c281 CS	186	* @cdev: device for adapter to shutdown.
1da177e4	187	*/
fa04c281	188	static void zfcp_ccw_shutdown(struct ccw_device *cdev)
1da177e4 LT	189	{
	190	struct zfcp_adapter *adapter;
	191
	192	down(&zfcp_data.config_sema);
958974fb	193	adapter = dev_get_drvdata(&cdev->dev);
1f6f7129	194	zfcp_erp_adapter_shutdown(adapter, 0, 90, NULL);
1da177e4 LT	195	zfcp_erp_wait(adapter);
	196	up(&zfcp_data.config_sema);
	197	}
	198
fa04c281 CS	199	static struct ccw_device_id zfcp_ccw_device_id[] = {
	200	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
	201	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x4) }, /* priv. */
	202	{},
	203	};
	204
	205	MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
	206
	207	static struct ccw_driver zfcp_ccw_driver = {
	208	.owner = THIS_MODULE,
	209	.name = "zfcp",
	210	.ids = zfcp_ccw_device_id,
	211	.probe = zfcp_ccw_probe,
	212	.remove = zfcp_ccw_remove,
	213	.set_online = zfcp_ccw_set_online,
	214	.set_offline = zfcp_ccw_set_offline,
	215	.notify = zfcp_ccw_notify,
	216	.shutdown = zfcp_ccw_shutdown,
	217	};
	218
	219	/**
	220	* zfcp_ccw_register - ccw register function
	221	*
	222	* Registers the driver at the common i/o layer. This function will be called
	223	* at module load time/system start.
	224	*/
	225	int __init zfcp_ccw_register(void)
	226	{
	227	return ccw_driver_register(&zfcp_ccw_driver);
	228	}