[linux-2.6-block.git] / drivers / scsi / libsas / sas_discover.c

/*
 * Serial Attached SCSI (SAS) Discover process
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 *
 * This file is licensed under GPLv2.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_eh.h>
#include "sas_internal.h"

#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include <scsi/sas_ata.h>
#include "../scsi_sas_internal.h"

/* ---------- Basic task processing for discovery purposes ---------- */

void sas_init_dev(struct domain_device *dev)
{
        switch (dev->dev_type) {
        case SAS_END_DEV:
                break;
        case EDGE_DEV:
        case FANOUT_DEV:
                INIT_LIST_HEAD(&dev->ex_dev.children);
                break;
        case SATA_DEV:
        case SATA_PM:
        case SATA_PM_PORT:
                INIT_LIST_HEAD(&dev->sata_dev.children);
                break;
        default:
                break;
        }
}

/* ---------- Domain device discovery ---------- */

/**
 * sas_get_port_device -- Discover devices which caused port creation
 * @port: pointer to struct sas_port of interest
 *
 * Devices directly attached to a HA port, have no parent.  This is
 * how we know they are (domain) "root" devices.  All other devices
 * do, and should have their "parent" pointer set appropriately as
 * soon as a child device is discovered.
 */
static int sas_get_port_device(struct asd_sas_port *port)
{
	unsigned long flags;
	struct asd_sas_phy *phy;
	struct sas_rphy *rphy;
	struct domain_device *dev;

	dev = sas_alloc_device();
	if (!dev)
		return -ENOMEM;

	spin_lock_irqsave(&port->phy_list_lock, flags);
	if (list_empty(&port->phy_list)) {
		spin_unlock_irqrestore(&port->phy_list_lock, flags);
		sas_put_device(dev);
		return -ENODEV;
	}
	phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
	spin_lock(&phy->frame_rcvd_lock);
	memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
					     (size_t)phy->frame_rcvd_size));
	spin_unlock(&phy->frame_rcvd_lock);
	spin_unlock_irqrestore(&port->phy_list_lock, flags);

	if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
		struct dev_to_host_fis *fis =
			(struct dev_to_host_fis *) dev->frame_rcvd;
		if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
		    fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
		    && (fis->device & ~0x10) == 0)
			dev->dev_type = SATA_PM;
		else
			dev->dev_type = SATA_DEV;
		dev->tproto = SAS_PROTOCOL_SATA;
	} else {
		struct sas_identify_frame *id =
			(struct sas_identify_frame *) dev->frame_rcvd;
		dev->dev_type = id->dev_type;
		dev->iproto = id->initiator_bits;
		dev->tproto = id->target_bits;
	}

	sas_init_dev(dev);

	switch (dev->dev_type) {
	case SAS_END_DEV:
	case SATA_DEV:
		rphy = sas_end_device_alloc(port->port);
		break;
	case EDGE_DEV:
		rphy = sas_expander_alloc(port->port,
					  SAS_EDGE_EXPANDER_DEVICE);
		break;
	case FANOUT_DEV:
		rphy = sas_expander_alloc(port->port,
					  SAS_FANOUT_EXPANDER_DEVICE);
		break;
	default:
		printk("ERROR: Unidentified device type %d\n", dev->dev_type);
		rphy = NULL;
		break;
	}

	if (!rphy) {
		sas_put_device(dev);
		return -ENODEV;
	}
	rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
	memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
	sas_fill_in_rphy(dev, rphy);
	sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
	port->port_dev = dev;
	dev->port = port;
	dev->linkrate = port->linkrate;
	dev->min_linkrate = port->linkrate;
	dev->max_linkrate = port->linkrate;
	dev->pathways = port->num_phys;
	memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
	memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
	memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
	port->disc.max_level = 0;

	dev->rphy = rphy;
	spin_lock_irq(&port->dev_list_lock);
	list_add_tail(&dev->dev_list_node, &port->dev_list);
	spin_unlock_irq(&port->dev_list_lock);

	return 0;
}

/* ---------- Discover and Revalidate ---------- */

int sas_notify_lldd_dev_found(struct domain_device *dev)
{
	int res = 0;
	struct sas_ha_struct *sas_ha = dev->port->ha;
	struct Scsi_Host *shost = sas_ha->core.shost;
	struct sas_internal *i = to_sas_internal(shost->transportt);

	if (i->dft->lldd_dev_found) {
		res = i->dft->lldd_dev_found(dev);
		if (res) {
			printk("sas: driver on pcidev %s cannot handle "
			       "device %llx, error:%d\n",
			       dev_name(sas_ha->dev),
			       SAS_ADDR(dev->sas_addr), res);
		}
		kref_get(&dev->kref);
	}
	return res;
}


void sas_notify_lldd_dev_gone(struct domain_device *dev)
{
	struct sas_ha_struct *sas_ha = dev->port->ha;
	struct Scsi_Host *shost = sas_ha->core.shost;
	struct sas_internal *i = to_sas_internal(shost->transportt);

	if (i->dft->lldd_dev_gone) {
		i->dft->lldd_dev_gone(dev);
		sas_put_device(dev);
	}
}

/* ---------- Common/dispatchers ---------- */


/**
 * sas_discover_end_dev -- discover an end device (SSP, etc)
 * @end: pointer to domain device of interest
 *
 * See comment in sas_discover_sata().
 */
int sas_discover_end_dev(struct domain_device *dev)
{
	int res;

	res = sas_notify_lldd_dev_found(dev);
	if (res)
		goto out_err2;

	res = sas_rphy_add(dev->rphy);
	if (res)
		goto out_err;

	return 0;

out_err:
	sas_notify_lldd_dev_gone(dev);
out_err2:
	return res;
}

/* ---------- Device registration and unregistration ---------- */

void sas_free_device(struct kref *kref)
{
	struct domain_device *dev = container_of(kref, typeof(*dev), kref);

	if (dev->parent)
		sas_put_device(dev->parent);

	/* remove the phys and ports, everything else should be gone */
	if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV)
		kfree(dev->ex_dev.ex_phy);

	if (dev_is_sata(dev)) {
		kfree(dev->sata_dev.identify_device);
		kfree(dev->sata_dev.identify_packet_device);
	}

	kfree(dev);
}

static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
{
	sas_notify_lldd_dev_gone(dev);
	if (!dev->parent)
		dev->port->port_dev = NULL;
	else
		list_del_init(&dev->siblings);

	spin_lock_irq(&port->dev_list_lock);
	list_del_init(&dev->dev_list_node);
	spin_unlock_irq(&port->dev_list_lock);

	sas_put_device(dev);
}

void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
{
	if (dev->rphy) {
		sas_remove_children(&dev->rphy->dev);
		sas_rphy_delete(dev->rphy);
		dev->rphy = NULL;
	}
	sas_unregister_common_dev(port, dev);
}

void sas_unregister_domain_devices(struct asd_sas_port *port)
{
	struct domain_device *dev, *n;

	list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node)
		sas_unregister_dev(port, dev);

	port->port->rphy = NULL;

}

/* ---------- Discovery and Revalidation ---------- */

/**
 * sas_discover_domain -- discover the domain
 * @port: port to the domain of interest
 *
 * NOTE: this process _must_ quit (return) as soon as any connection
 * errors are encountered.  Connection recovery is done elsewhere.
 * Discover process only interrogates devices in order to discover the
 * domain.
 */
static void sas_discover_domain(struct work_struct *work)
{
	struct domain_device *dev;
	int error = 0;
	struct sas_discovery_event *ev =
		container_of(work, struct sas_discovery_event, work);
	struct asd_sas_port *port = ev->port;

	sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
			&port->disc.pending);

	if (port->port_dev)
		return;

	error = sas_get_port_device(port);
	if (error)
		return;
	dev = port->port_dev;

	SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
		    task_pid_nr(current));

	switch (dev->dev_type) {
	case SAS_END_DEV:
		error = sas_discover_end_dev(dev);
		break;
	case EDGE_DEV:
	case FANOUT_DEV:
		error = sas_discover_root_expander(dev);
		break;
	case SATA_DEV:
	case SATA_PM:
#ifdef CONFIG_SCSI_SAS_ATA
		error = sas_discover_sata(dev);
		break;
#else
		SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
		/* Fall through */
#endif
	default:
		error = -ENXIO;
		SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
		break;
	}

	if (error) {
		sas_rphy_free(dev->rphy);
		dev->rphy = NULL;

		spin_lock_irq(&port->dev_list_lock);
		list_del_init(&dev->dev_list_node);
		spin_unlock_irq(&port->dev_list_lock);

		sas_put_device(dev);
		port->port_dev = NULL;
	}

	SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
		    task_pid_nr(current), error);
}

static void sas_revalidate_domain(struct work_struct *work)
{
	int res = 0;
	struct sas_discovery_event *ev =
		container_of(work, struct sas_discovery_event, work);
	struct asd_sas_port *port = ev->port;

	sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
			&port->disc.pending);

	SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
		    task_pid_nr(current));
	if (port->port_dev)
		res = sas_ex_revalidate_domain(port->port_dev);

	SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
		    port->id, task_pid_nr(current), res);
}

/* ---------- Events ---------- */

int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
{
	struct sas_discovery *disc;

	if (!port)
		return 0;
	disc = &port->disc;

	BUG_ON(ev >= DISC_NUM_EVENTS);

	sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
			&disc->disc_work[ev].work, port->ha);

	return 0;
}

/**
 * sas_init_disc -- initialize the discovery struct in the port
 * @port: pointer to struct port
 *
 * Called when the ports are being initialized.
 */
void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
{
	int i;

	static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
		[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
		[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
	};

	spin_lock_init(&disc->disc_event_lock);
	disc->pending = 0;
	for (i = 0; i < DISC_NUM_EVENTS; i++) {
		INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
		disc->disc_work[i].port = port;
	}
}
Commit	Line	Data
2908d778 JB	1	/*
	2	* Serial Attached SCSI (SAS) Discover process
	3	*
	4	* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
	5	* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
	6	*
	7	* This file is licensed under GPLv2.
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License as
	11	* published by the Free Software Foundation; either version 2 of the
	12	* License, or (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	22	*
	23	*/
	24
2908d778	25	#include <linux/scatterlist.h>
5a0e3ad6	26	#include <linux/slab.h>
2908d778 JB	27	#include <scsi/scsi_host.h>
	28	#include <scsi/scsi_eh.h>
	29	#include "sas_internal.h"
	30
	31	#include <scsi/scsi_transport.h>
	32	#include <scsi/scsi_transport_sas.h>
756f173f	33	#include <scsi/sas_ata.h>
2908d778 JB	34	#include "../scsi_sas_internal.h"
	35
	36	/* ---------- Basic task processing for discovery purposes ---------- */
	37
	38	void sas_init_dev(struct domain_device *dev)
	39	{
2908d778 JB	40	switch (dev->dev_type) {
	41	case SAS_END_DEV:
	42	break;
	43	case EDGE_DEV:
	44	case FANOUT_DEV:
	45	INIT_LIST_HEAD(&dev->ex_dev.children);
	46	break;
	47	case SATA_DEV:
	48	case SATA_PM:
	49	case SATA_PM_PORT:
	50	INIT_LIST_HEAD(&dev->sata_dev.children);
	51	break;
	52	default:
	53	break;
	54	}
	55	}
	56
2908d778 JB	57	/* ---------- Domain device discovery ---------- */
	58
	59	/**
	60	* sas_get_port_device -- Discover devices which caused port creation
	61	* @port: pointer to struct sas_port of interest
	62	*
	63	* Devices directly attached to a HA port, have no parent. This is
	64	* how we know they are (domain) "root" devices. All other devices
	65	* do, and should have their "parent" pointer set appropriately as
	66	* soon as a child device is discovered.
	67	*/
	68	static int sas_get_port_device(struct asd_sas_port *port)
	69	{
	70	unsigned long flags;
	71	struct asd_sas_phy *phy;
	72	struct sas_rphy *rphy;
	73	struct domain_device *dev;
	74
735f7d2f	75	dev = sas_alloc_device();
2908d778 JB	76	if (!dev)
	77	return -ENOMEM;
	78
	79	spin_lock_irqsave(&port->phy_list_lock, flags);
	80	if (list_empty(&port->phy_list)) {
	81	spin_unlock_irqrestore(&port->phy_list_lock, flags);
735f7d2f	82	sas_put_device(dev);
2908d778 JB	83	return -ENODEV;
	84	}
	85	phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
	86	spin_lock(&phy->frame_rcvd_lock);
	87	memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
	88	(size_t)phy->frame_rcvd_size));
	89	spin_unlock(&phy->frame_rcvd_lock);
	90	spin_unlock_irqrestore(&port->phy_list_lock, flags);
	91
	92	if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
	93	struct dev_to_host_fis *fis =
	94	(struct dev_to_host_fis *) dev->frame_rcvd;
	95	if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
	96	fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
	97	&& (fis->device & ~0x10) == 0)
	98	dev->dev_type = SATA_PM;
	99	else
	100	dev->dev_type = SATA_DEV;
5929faf3	101	dev->tproto = SAS_PROTOCOL_SATA;
2908d778 JB	102	} else {
	103	struct sas_identify_frame *id =
	104	(struct sas_identify_frame *) dev->frame_rcvd;
	105	dev->dev_type = id->dev_type;
	106	dev->iproto = id->initiator_bits;
	107	dev->tproto = id->target_bits;
	108	}
	109
	110	sas_init_dev(dev);
	111
	112	switch (dev->dev_type) {
	113	case SAS_END_DEV:
fa1c1e8f	114	case SATA_DEV:
2908d778 JB	115	rphy = sas_end_device_alloc(port->port);
	116	break;
	117	case EDGE_DEV:
	118	rphy = sas_expander_alloc(port->port,
	119	SAS_EDGE_EXPANDER_DEVICE);
	120	break;
	121	case FANOUT_DEV:
	122	rphy = sas_expander_alloc(port->port,
	123	SAS_FANOUT_EXPANDER_DEVICE);
	124	break;
2908d778 JB	125	default:
	126	printk("ERROR: Unidentified device type %d\n", dev->dev_type);
	127	rphy = NULL;
	128	break;
	129	}
	130
	131	if (!rphy) {
735f7d2f	132	sas_put_device(dev);
2908d778 JB	133	return -ENODEV;
	134	}
	135	rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
	136	memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
	137	sas_fill_in_rphy(dev, rphy);
	138	sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
	139	port->port_dev = dev;
	140	dev->port = port;
	141	dev->linkrate = port->linkrate;
	142	dev->min_linkrate = port->linkrate;
	143	dev->max_linkrate = port->linkrate;
	144	dev->pathways = port->num_phys;
	145	memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
	146	memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
	147	memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
	148	port->disc.max_level = 0;
	149
	150	dev->rphy = rphy;
9d720d82	151	spin_lock_irq(&port->dev_list_lock);
2908d778	152	list_add_tail(&dev->dev_list_node, &port->dev_list);
9d720d82	153	spin_unlock_irq(&port->dev_list_lock);
2908d778 JB	154
	155	return 0;
	156	}
	157
	158	/* ---------- Discover and Revalidate ---------- */
	159
2908d778 JB	160	int sas_notify_lldd_dev_found(struct domain_device *dev)
	161	{
	162	int res = 0;
	163	struct sas_ha_struct *sas_ha = dev->port->ha;
	164	struct Scsi_Host *shost = sas_ha->core.shost;
	165	struct sas_internal *i = to_sas_internal(shost->transportt);
	166
	167	if (i->dft->lldd_dev_found) {
	168	res = i->dft->lldd_dev_found(dev);
	169	if (res) {
	170	printk("sas: driver on pcidev %s cannot handle "
	171	"device %llx, error:%d\n",
71610f55	172	dev_name(sas_ha->dev),
2908d778 JB	173	SAS_ADDR(dev->sas_addr), res);
2908d778 JB	174	}
735f7d2f	175	kref_get(&dev->kref);
2908d778 JB	176	}
	177	return res;
	178	}
	179
	180
	181	void sas_notify_lldd_dev_gone(struct domain_device *dev)
	182	{
	183	struct sas_ha_struct *sas_ha = dev->port->ha;
	184	struct Scsi_Host *shost = sas_ha->core.shost;
	185	struct sas_internal *i = to_sas_internal(shost->transportt);
	186
735f7d2f	187	if (i->dft->lldd_dev_gone) {
2908d778	188	i->dft->lldd_dev_gone(dev);
735f7d2f DW	189	sas_put_device(dev);
735f7d2f DW	190	}
2908d778 JB	191	}
	192
	193	/* ---------- Common/dispatchers ---------- */
	194
2908d778 JB	195
	196	/**
	197	* sas_discover_end_dev -- discover an end device (SSP, etc)
	198	* @end: pointer to domain device of interest
	199	*
	200	* See comment in sas_discover_sata().
	201	*/
	202	int sas_discover_end_dev(struct domain_device *dev)
	203	{
	204	int res;
	205
	206	res = sas_notify_lldd_dev_found(dev);
	207	if (res)
88808398	208	goto out_err2;
2908d778 JB	209
	210	res = sas_rphy_add(dev->rphy);
	211	if (res)
	212	goto out_err;
	213
2908d778 JB	214	return 0;
	215
	216	out_err:
	217	sas_notify_lldd_dev_gone(dev);
88808398	218	out_err2:
2908d778 JB	219	return res;
	220	}
	221
	222	/* ---------- Device registration and unregistration ---------- */
	223
735f7d2f DW	224	void sas_free_device(struct kref *kref)
	225	{
	226	struct domain_device dev = container_of(kref, typeof(dev), kref);
	227
	228	if (dev->parent)
	229	sas_put_device(dev->parent);
	230
	231	/* remove the phys and ports, everything else should be gone */
	232	if (dev->dev_type == EDGE_DEV \|\| dev->dev_type == FANOUT_DEV)
	233	kfree(dev->ex_dev.ex_phy);
	234
756f173f DW	235	if (dev_is_sata(dev)) {
	236	kfree(dev->sata_dev.identify_device);
	237	kfree(dev->sata_dev.identify_packet_device);
	238	}
	239
735f7d2f DW	240	kfree(dev);
	241	}
	242
1a34c064	243	static void sas_unregister_common_dev(struct asd_sas_port port, struct domain_device dev)
2908d778 JB	244	{
	245	sas_notify_lldd_dev_gone(dev);
	246	if (!dev->parent)
	247	dev->port->port_dev = NULL;
	248	else
	249	list_del_init(&dev->siblings);
1a34c064 DW	250
1a34c064 DW	251	spin_lock_irq(&port->dev_list_lock);
2908d778	252	list_del_init(&dev->dev_list_node);
1a34c064	253	spin_unlock_irq(&port->dev_list_lock);
735f7d2f DW	254
735f7d2f DW	255	sas_put_device(dev);
2908d778 JB	256	}
2908d778 JB	257
1a34c064	258	void sas_unregister_dev(struct asd_sas_port port, struct domain_device dev)
2908d778 JB	259	{
	260	if (dev->rphy) {
	261	sas_remove_children(&dev->rphy->dev);
	262	sas_rphy_delete(dev->rphy);
	263	dev->rphy = NULL;
	264	}
1a34c064	265	sas_unregister_common_dev(port, dev);
2908d778 JB	266	}
	267
	268	void sas_unregister_domain_devices(struct asd_sas_port *port)
	269	{
	270	struct domain_device dev, n;
	271
1a34c064 DW	272	list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node)
1a34c064 DW	273	sas_unregister_dev(port, dev);
2908d778 JB	274
	275	port->port->rphy = NULL;
	276
	277	}
	278
	279	/* ---------- Discovery and Revalidation ---------- */
	280
	281	/**
	282	* sas_discover_domain -- discover the domain
	283	* @port: port to the domain of interest
	284	*
	285	* NOTE: this process _must_ quit (return) as soon as any connection
	286	* errors are encountered. Connection recovery is done elsewhere.
	287	* Discover process only interrogates devices in order to discover the
	288	* domain.
	289	*/
c4028958	290	static void sas_discover_domain(struct work_struct *work)
2908d778	291	{
6f63caae	292	struct domain_device *dev;
2908d778	293	int error = 0;
c4028958 DH	294	struct sas_discovery_event *ev =
	295	container_of(work, struct sas_discovery_event, work);
	296	struct asd_sas_port *port = ev->port;
2908d778 JB	297
	298	sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
	299	&port->disc.pending);
	300
	301	if (port->port_dev)
6f63caae DW	302	return;
	303
	304	error = sas_get_port_device(port);
	305	if (error)
	306	return;
	307	dev = port->port_dev;
2908d778 JB	308
2908d778 JB	309	SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
ba25f9dc	310	task_pid_nr(current));
2908d778	311
6f63caae	312	switch (dev->dev_type) {
2908d778	313	case SAS_END_DEV:
6f63caae	314	error = sas_discover_end_dev(dev);
2908d778 JB	315	break;
	316	case EDGE_DEV:
	317	case FANOUT_DEV:
6f63caae	318	error = sas_discover_root_expander(dev);
2908d778 JB	319	break;
	320	case SATA_DEV:
	321	case SATA_PM:
15c73d5a	322	#ifdef CONFIG_SCSI_SAS_ATA
6f63caae	323	error = sas_discover_sata(dev);
2908d778	324	break;
15c73d5a JB	325	#else
	326	SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
	327	/* Fall through */
b9142174	328	#endif
2908d778	329	default:
b9142174	330	error = -ENXIO;
6f63caae	331	SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
2908d778 JB	332	break;
	333	}
	334
	335	if (error) {
6f63caae DW	336	sas_rphy_free(dev->rphy);
	337	dev->rphy = NULL;
	338
9d720d82	339	spin_lock_irq(&port->dev_list_lock);
6f63caae	340	list_del_init(&dev->dev_list_node);
9d720d82	341	spin_unlock_irq(&port->dev_list_lock);
88808398	342
735f7d2f	343	sas_put_device(dev);
2908d778 JB	344	port->port_dev = NULL;
	345	}
	346
	347	SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
ba25f9dc	348	task_pid_nr(current), error);
2908d778 JB	349	}
2908d778 JB	350
c4028958	351	static void sas_revalidate_domain(struct work_struct *work)
2908d778 JB	352	{
2908d778 JB	353	int res = 0;
c4028958 DH	354	struct sas_discovery_event *ev =
	355	container_of(work, struct sas_discovery_event, work);
	356	struct asd_sas_port *port = ev->port;
2908d778 JB	357
	358	sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
	359	&port->disc.pending);
	360
	361	SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
ba25f9dc	362	task_pid_nr(current));
2908d778 JB	363	if (port->port_dev)
	364	res = sas_ex_revalidate_domain(port->port_dev);
	365
	366	SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
ba25f9dc	367	port->id, task_pid_nr(current), res);
2908d778 JB	368	}
	369
	370	/* ---------- Events ---------- */
	371
	372	int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
	373	{
	374	struct sas_discovery *disc;
	375
	376	if (!port)
	377	return 0;
	378	disc = &port->disc;
	379
	380	BUG_ON(ev >= DISC_NUM_EVENTS);
	381
	382	sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
6b0efb85	383	&disc->disc_work[ev].work, port->ha);
2908d778 JB	384
	385	return 0;
	386	}
	387
	388	/**
	389	* sas_init_disc -- initialize the discovery struct in the port
	390	* @port: pointer to struct port
	391	*
	392	* Called when the ports are being initialized.
	393	*/
	394	void sas_init_disc(struct sas_discovery disc, struct asd_sas_port port)
	395	{
	396	int i;
	397
c4028958	398	static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
2908d778 JB	399	[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
	400	[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
	401	};
	402
	403	spin_lock_init(&disc->disc_event_lock);
	404	disc->pending = 0;
c4028958 DH	405	for (i = 0; i < DISC_NUM_EVENTS; i++) {
	406	INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
	407	disc->disc_work[i].port = port;
	408	}
2908d778	409	}