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

/*
 * zfcp device driver
 *
 * Registration and callback for the s390 common I/O layer.
 *
 * Copyright IBM Corporation 2002, 2009
 */

#define KMSG_COMPONENT "zfcp"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include "zfcp_ext.h"

#define ZFCP_MODEL_PRIV 0x4

static int zfcp_ccw_suspend(struct ccw_device *cdev)

{
	struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);

	if (!adapter)
		return 0;

	mutex_lock(&zfcp_data.config_mutex);

	zfcp_erp_adapter_shutdown(adapter, 0, "ccsusp1", NULL);
	zfcp_erp_wait(adapter);

	mutex_unlock(&zfcp_data.config_mutex);

	return 0;
}

static int zfcp_ccw_activate(struct ccw_device *cdev)

{
	struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);

	if (!adapter)
		return 0;

	zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
				       ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
				"ccresu2", NULL);
	zfcp_erp_wait(adapter);
	flush_work(&adapter->scan_work);

	return 0;
}

static struct ccw_device_id zfcp_ccw_device_id[] = {
	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
	{},
};
MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);

/**
 * zfcp_ccw_priv_sch - check if subchannel is privileged
 * @adapter: Adapter/Subchannel to check
 */
int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
{
	return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
}

/**
 * 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 for each FCP
 * device found on the current system. This is only a stub to make cio
 * work: To only allocate adapter resources for devices actually used,
 * the allocation is deferred to the first call to ccw_set_online.
 */
static int zfcp_ccw_probe(struct ccw_device *ccw_device)
{
	return 0;
}

/**
 * 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;
	LIST_HEAD(unit_remove_lh);
	LIST_HEAD(port_remove_lh);

	ccw_device_set_offline(ccw_device);

	mutex_lock(&zfcp_data.config_mutex);
	adapter = dev_get_drvdata(&ccw_device->dev);
	if (!adapter)
		goto out;
	mutex_unlock(&zfcp_data.config_mutex);

	cancel_work_sync(&adapter->scan_work);

	mutex_lock(&zfcp_data.config_mutex);

	/* this also removes the scsi devices, so call it first */
	zfcp_adapter_scsi_unregister(adapter);

	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, &unit_remove_lh);
			atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
					&unit->status);
		}
		list_move(&port->list, &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, &port_remove_lh, list) {
		list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
			zfcp_unit_dequeue(unit);
		zfcp_port_dequeue(port);
	}
	wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
	zfcp_adapter_dequeue(adapter);

out:
	mutex_unlock(&zfcp_data.config_mutex);
}

/**
 * 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.  The first call will allocate all
 * adapter resources that will be retained until the device is removed
 * via zfcp_ccw_remove.
 *
 * 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.
 */
static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
{
	struct zfcp_adapter *adapter;
	int ret = 0;

	mutex_lock(&zfcp_data.config_mutex);
	adapter = dev_get_drvdata(&ccw_device->dev);

	if (!adapter) {
		ret = zfcp_adapter_enqueue(ccw_device);
		if (ret) {
			dev_err(&ccw_device->dev,
				"Setting up data structures for the "
				"FCP adapter failed\n");
			goto out;
		}
		adapter = dev_get_drvdata(&ccw_device->dev);
	}

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

	zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
				       ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
				"ccsonl2", NULL);
	zfcp_erp_wait(adapter);
out:
	mutex_unlock(&zfcp_data.config_mutex);
	if (!ret)
		flush_work(&adapter->scan_work);
	return ret;
}

/**
 * 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;

	mutex_lock(&zfcp_data.config_mutex);
	adapter = dev_get_drvdata(&ccw_device->dev);
	zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
	zfcp_erp_wait(adapter);
	mutex_unlock(&zfcp_data.config_mutex);
	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 = dev_get_drvdata(&ccw_device->dev);

	switch (event) {
	case CIO_GONE:
		dev_warn(&adapter->ccw_device->dev,
			 "The FCP device has been detached\n");
		zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
		break;
	case CIO_NO_PATH:
		dev_warn(&adapter->ccw_device->dev,
			 "The CHPID for the FCP device is offline\n");
		zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
		break;
	case CIO_OPER:
		dev_info(&adapter->ccw_device->dev,
			 "The FCP device is operational again\n");
		zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
					       ZFCP_STATUS_COMMON_RUNNING,
					       ZFCP_SET);
		zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
					"ccnoti4", NULL);
		break;
	case CIO_BOXED:
		dev_warn(&adapter->ccw_device->dev, "The FCP device "
			 "did not respond within the specified time\n");
		zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
		break;
	}
	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;

	mutex_lock(&zfcp_data.config_mutex);
	adapter = dev_get_drvdata(&cdev->dev);
	if (!adapter)
		goto out;

	zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
	zfcp_erp_wait(adapter);
	zfcp_erp_thread_kill(adapter);
out:
	mutex_unlock(&zfcp_data.config_mutex);
}

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,
	.freeze      = zfcp_ccw_suspend,
	.thaw	     = zfcp_ccw_activate,
	.restore     = zfcp_ccw_activate,
};

/**
 * 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	*
6d1a27f6	6	* Copyright IBM Corporation 2002, 2009
1da177e4 LT	7	*/
1da177e4 LT	8
ecf39d42 CS	9	#define KMSG_COMPONENT "zfcp"
	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	11
1da177e4 LT	12	#include "zfcp_ext.h"
1da177e4 LT	13
6fcf41d1 CS	14	#define ZFCP_MODEL_PRIV 0x4
6fcf41d1 CS	15
daa70fa9 MP	16	static int zfcp_ccw_suspend(struct ccw_device *cdev)
	17
	18	{
	19	struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
	20
143bb6bf CS	21	if (!adapter)
	22	return 0;
	23
24680def	24	mutex_lock(&zfcp_data.config_mutex);
daa70fa9 MP	25
	26	zfcp_erp_adapter_shutdown(adapter, 0, "ccsusp1", NULL);
	27	zfcp_erp_wait(adapter);
	28
24680def	29	mutex_unlock(&zfcp_data.config_mutex);
daa70fa9 MP	30
	31	return 0;
	32	}
	33
	34	static int zfcp_ccw_activate(struct ccw_device *cdev)
	35
	36	{
	37	struct zfcp_adapter *adapter = dev_get_drvdata(&cdev->dev);
	38
143bb6bf CS	39	if (!adapter)
	40	return 0;
	41
daa70fa9 MP	42	zfcp_erp_modify_adapter_status(adapter, "ccresu1", NULL,
	43	ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
	44	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
	45	"ccresu2", NULL);
	46	zfcp_erp_wait(adapter);
	47	flush_work(&adapter->scan_work);
	48
	49	return 0;
	50	}
	51
6fcf41d1 CS	52	static struct ccw_device_id zfcp_ccw_device_id[] = {
	53	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, 0x3) },
	54	{ CCW_DEVICE_DEVTYPE(0x1731, 0x3, 0x1732, ZFCP_MODEL_PRIV) },
	55	{},
	56	};
	57	MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
	58
	59	/**
	60	* zfcp_ccw_priv_sch - check if subchannel is privileged
	61	* @adapter: Adapter/Subchannel to check
	62	*/
	63	int zfcp_ccw_priv_sch(struct zfcp_adapter *adapter)
	64	{
	65	return adapter->ccw_device->id.dev_model == ZFCP_MODEL_PRIV;
	66	}
	67
1da177e4 LT	68	/**
	69	* zfcp_ccw_probe - probe function of zfcp driver
	70	* @ccw_device: pointer to belonging ccw device
	71	*
143bb6bf CS	72	* This function gets called by the common i/o layer for each FCP
	73	* device found on the current system. This is only a stub to make cio
	74	* work: To only allocate adapter resources for devices actually used,
	75	* the allocation is deferred to the first call to ccw_set_online.
1da177e4	76	*/
fa04c281	77	static int zfcp_ccw_probe(struct ccw_device *ccw_device)
1da177e4	78	{
143bb6bf	79	return 0;
1da177e4 LT	80	}
	81
	82	/**
	83	* zfcp_ccw_remove - remove function of zfcp driver
	84	* @ccw_device: pointer to belonging ccw device
	85	*
	86	* This function gets called by the common i/o layer and removes an adapter
	87	* from the system. Task of this function is to get rid of all units and
	88	* ports that belong to this adapter. And in addition all resources of this
	89	* adapter will be freed too.
	90	*/
fa04c281	91	static void zfcp_ccw_remove(struct ccw_device *ccw_device)
1da177e4 LT	92	{
	93	struct zfcp_adapter *adapter;
	94	struct zfcp_port port, p;
	95	struct zfcp_unit unit, u;
0406289e CS	96	LIST_HEAD(unit_remove_lh);
0406289e CS	97	LIST_HEAD(port_remove_lh);
1da177e4 LT	98
1da177e4 LT	99	ccw_device_set_offline(ccw_device);
143bb6bf	100
24680def	101	mutex_lock(&zfcp_data.config_mutex);
1da177e4	102	adapter = dev_get_drvdata(&ccw_device->dev);
143bb6bf CS	103	if (!adapter)
143bb6bf CS	104	goto out;
f45a5421 CS	105	mutex_unlock(&zfcp_data.config_mutex);
	106
	107	cancel_work_sync(&adapter->scan_work);
1da177e4	108
f45a5421	109	mutex_lock(&zfcp_data.config_mutex);
d74cf7c3 CS	110
	111	/* this also removes the scsi devices, so call it first */
	112	zfcp_adapter_scsi_unregister(adapter);
	113
1da177e4 LT	114	write_lock_irq(&zfcp_data.config_lock);
	115	list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
	116	list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
0406289e	117	list_move(&unit->list, &unit_remove_lh);
1da177e4 LT	118	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
	119	&unit->status);
	120	}
0406289e	121	list_move(&port->list, &port_remove_lh);
1da177e4 LT	122	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
	123	}
	124	atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
	125	write_unlock_irq(&zfcp_data.config_lock);
	126
0406289e	127	list_for_each_entry_safe(port, p, &port_remove_lh, list) {
d74cf7c3	128	list_for_each_entry_safe(unit, u, &unit_remove_lh, list)
1da177e4	129	zfcp_unit_dequeue(unit);
1da177e4 LT	130	zfcp_port_dequeue(port);
1da177e4 LT	131	}
44cc76f2	132	wait_event(adapter->remove_wq, atomic_read(&adapter->refcount) == 0);
1da177e4 LT	133	zfcp_adapter_dequeue(adapter);
1da177e4 LT	134
143bb6bf	135	out:
24680def	136	mutex_unlock(&zfcp_data.config_mutex);
1da177e4 LT	137	}
	138
	139	/**
	140	* zfcp_ccw_set_online - set_online function of zfcp driver
	141	* @ccw_device: pointer to belonging ccw device
	142	*
143bb6bf CS	143	* This function gets called by the common i/o layer and sets an
	144	* adapter into state online. The first call will allocate all
	145	* adapter resources that will be retained until the device is removed
	146	* via zfcp_ccw_remove.
	147	*
	148	* Setting an fcp device online means that it will be registered with
	149	* the SCSI stack, that the QDIO queues will be set up and that the
	150	* adapter will be opened.
1da177e4	151	*/
fa04c281	152	static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
1da177e4 LT	153	{
1da177e4 LT	154	struct zfcp_adapter *adapter;
143bb6bf	155	int ret = 0;
1da177e4	156
24680def	157	mutex_lock(&zfcp_data.config_mutex);
1da177e4 LT	158	adapter = dev_get_drvdata(&ccw_device->dev);
1da177e4 LT	159
143bb6bf CS	160	if (!adapter) {
	161	ret = zfcp_adapter_enqueue(ccw_device);
	162	if (ret) {
	163	dev_err(&ccw_device->dev,
	164	"Setting up data structures for the "
	165	"FCP adapter failed\n");
	166	goto out;
	167	}
	168	adapter = dev_get_drvdata(&ccw_device->dev);
	169	}
1da177e4	170
fea9d6c7 VS	171	/* initialize request counter */
	172	BUG_ON(!zfcp_reqlist_isempty(adapter));
	173	adapter->req_no = 0;
	174
5ffd51a5	175	zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
698ec016	176	ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
5ffd51a5 SS	177	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
5ffd51a5 SS	178	"ccsonl2", NULL);
1da177e4	179	zfcp_erp_wait(adapter);
143bb6bf	180	out:
24680def	181	mutex_unlock(&zfcp_data.config_mutex);
143bb6bf CS	182	if (!ret)
	183	flush_work(&adapter->scan_work);
	184	return ret;
1da177e4 LT	185	}
	186
	187	/**
	188	* zfcp_ccw_set_offline - set_offline function of zfcp driver
	189	* @ccw_device: pointer to belonging ccw device
	190	*
	191	* This function gets called by the common i/o layer and sets an adapter
9f28745a	192	* into state offline.
1da177e4	193	*/
fa04c281	194	static int zfcp_ccw_set_offline(struct ccw_device *ccw_device)
1da177e4 LT	195	{
	196	struct zfcp_adapter *adapter;
	197
24680def	198	mutex_lock(&zfcp_data.config_mutex);
1da177e4	199	adapter = dev_get_drvdata(&ccw_device->dev);
5ffd51a5	200	zfcp_erp_adapter_shutdown(adapter, 0, "ccsoff1", NULL);
1da177e4	201	zfcp_erp_wait(adapter);
24680def	202	mutex_unlock(&zfcp_data.config_mutex);
1da177e4 LT	203	return 0;
	204	}
	205
	206	/**
fa04c281	207	* zfcp_ccw_notify - ccw notify function
1da177e4 LT	208	* @ccw_device: pointer to belonging ccw device
	209	* @event: indicates if adapter was detached or attached
	210	*
	211	* This function gets called by the common i/o layer if an adapter has gone
	212	* or reappeared.
	213	*/
fa04c281	214	static int zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
1da177e4	215	{
f48bf7fb	216	struct zfcp_adapter *adapter = dev_get_drvdata(&ccw_device->dev);
1da177e4	217
1da177e4 LT	218	switch (event) {
1da177e4 LT	219	case CIO_GONE:
ff3b24fa CS	220	dev_warn(&adapter->ccw_device->dev,
ff3b24fa CS	221	"The FCP device has been detached\n");
5ffd51a5	222	zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti1", NULL);
1da177e4 LT	223	break;
1da177e4 LT	224	case CIO_NO_PATH:
ff3b24fa CS	225	dev_warn(&adapter->ccw_device->dev,
ff3b24fa CS	226	"The CHPID for the FCP device is offline\n");
5ffd51a5	227	zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti2", NULL);
1da177e4 LT	228	break;
1da177e4 LT	229	case CIO_OPER:
ff3b24fa CS	230	dev_info(&adapter->ccw_device->dev,
ff3b24fa CS	231	"The FCP device is operational again\n");
5ffd51a5	232	zfcp_erp_modify_adapter_status(adapter, "ccnoti3", NULL,
1da177e4 LT	233	ZFCP_STATUS_COMMON_RUNNING,
1da177e4 LT	234	ZFCP_SET);
1f6f7129	235	zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
5ffd51a5	236	"ccnoti4", NULL);
1da177e4	237	break;
47593bfa	238	case CIO_BOXED:
955a2155 CS	239	dev_warn(&adapter->ccw_device->dev, "The FCP device "
955a2155 CS	240	"did not respond within the specified time\n");
47593bfa SO	241	zfcp_erp_adapter_shutdown(adapter, 0, "ccnoti5", NULL);
47593bfa SO	242	break;
1da177e4	243	}
1da177e4 LT	244	return 1;
	245	}
	246
	247	/**
fa04c281 CS	248	* zfcp_ccw_shutdown - handle shutdown from cio
fa04c281 CS	249	* @cdev: device for adapter to shutdown.
1da177e4	250	*/
fa04c281	251	static void zfcp_ccw_shutdown(struct ccw_device *cdev)
1da177e4 LT	252	{
	253	struct zfcp_adapter *adapter;
	254
24680def	255	mutex_lock(&zfcp_data.config_mutex);
958974fb	256	adapter = dev_get_drvdata(&cdev->dev);
1f99bd4c CS	257	if (!adapter)
	258	goto out;
	259
5ffd51a5	260	zfcp_erp_adapter_shutdown(adapter, 0, "ccshut1", NULL);
1da177e4	261	zfcp_erp_wait(adapter);
143bb6bf	262	zfcp_erp_thread_kill(adapter);
1f99bd4c	263	out:
24680def	264	mutex_unlock(&zfcp_data.config_mutex);
1da177e4 LT	265	}
1da177e4 LT	266
c5afd81e	267	struct ccw_driver zfcp_ccw_driver = {
fa04c281 CS	268	.owner = THIS_MODULE,
	269	.name = "zfcp",
	270	.ids = zfcp_ccw_device_id,
	271	.probe = zfcp_ccw_probe,
	272	.remove = zfcp_ccw_remove,
	273	.set_online = zfcp_ccw_set_online,
	274	.set_offline = zfcp_ccw_set_offline,
	275	.notify = zfcp_ccw_notify,
	276	.shutdown = zfcp_ccw_shutdown,
daa70fa9 MP	277	.freeze = zfcp_ccw_suspend,
	278	.thaw = zfcp_ccw_activate,
	279	.restore = zfcp_ccw_activate,
fa04c281 CS	280	};
	281
	282	/**
	283	* zfcp_ccw_register - ccw register function
	284	*
	285	* Registers the driver at the common i/o layer. This function will be called
	286	* at module load time/system start.
	287	*/
	288	int __init zfcp_ccw_register(void)
	289	{
	290	return ccw_driver_register(&zfcp_ccw_driver);
	291	}