[deliverable/linux.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);
		mutex_init(&dev->ex_dev.cmd_mutex);
		break;
	case SATA_DEV:
	case SATA_PM:
	case SATA_PM_PORT:
	case SATA_PENDING:
		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)
{
	struct asd_sas_phy *phy;
	struct sas_rphy *rphy;
	struct domain_device *dev;

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

	spin_lock_irq(&port->phy_list_lock);
	if (list_empty(&port->phy_list)) {
		spin_unlock_irq(&port->phy_list_lock);
		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_irq(&port->phy_list_lock);

	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;
	sas_device_set_phy(dev, port->port);

	dev->rphy = rphy;

	if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEV)
		list_add_tail(&dev->disco_list_node, &port->disco_list);
	else {
		spin_lock_irq(&port->dev_list_lock);
		list_add_tail(&dev->dev_list_node, &port->dev_list);
		spin_unlock_irq(&port->dev_list_lock);
	}

	spin_lock_irq(&port->phy_list_lock);
	list_for_each_entry(phy, &port->phy_list, port_phy_el)
		sas_phy_set_target(phy, dev);
	spin_unlock_irq(&port->phy_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);
	}
}

static void sas_probe_devices(struct work_struct *work)
{
	struct domain_device *dev, *n;
	struct sas_discovery_event *ev = to_sas_discovery_event(work);
	struct asd_sas_port *port = ev->port;

	clear_bit(DISCE_PROBE, &port->disc.pending);

	/* devices must be domain members before link recovery and probe */
	list_for_each_entry(dev, &port->disco_list, disco_list_node) {
		spin_lock_irq(&port->dev_list_lock);
		list_add_tail(&dev->dev_list_node, &port->dev_list);
		spin_unlock_irq(&port->dev_list_lock);
	}

	sas_probe_sata(port);

	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
		int err;

		err = sas_rphy_add(dev->rphy);
		if (err)
			sas_fail_probe(dev, __func__, err);
		else
			list_del_init(&dev->disco_list_node);
	}
}

/**
 * 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)
		return res;
	sas_discover_event(dev->port, DISCE_PROBE);

	return 0;
}

/* ---------- 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);

	sas_port_put_phy(dev->phy);
	dev->phy = NULL;

	/* 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) && dev->sata_dev.ap) {
		ata_sas_port_destroy(dev->sata_dev.ap);
		dev->sata_dev.ap = NULL;
	}

	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);
}

static void sas_destruct_devices(struct work_struct *work)
{
	struct domain_device *dev, *n;
	struct sas_discovery_event *ev = to_sas_discovery_event(work);
	struct asd_sas_port *port = ev->port;

	clear_bit(DISCE_DESTRUCT, &port->disc.pending);

	list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
		list_del_init(&dev->disco_list_node);

		sas_remove_children(&dev->rphy->dev);
		sas_rphy_delete(dev->rphy);
		dev->rphy = NULL;
		sas_unregister_common_dev(port, dev);
	}
}

void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
{
	if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
	    !list_empty(&dev->disco_list_node)) {
		/* this rphy never saw sas_rphy_add */
		list_del_init(&dev->disco_list_node);
		sas_rphy_free(dev->rphy);
		dev->rphy = NULL;
		sas_unregister_common_dev(port, dev);
	}

	if (dev->rphy && !test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
		sas_rphy_unlink(dev->rphy);
		list_move_tail(&dev->disco_list_node, &port->destroy_list);
		sas_discover_event(dev->port, DISCE_DESTRUCT);
	}
}

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

	list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
		if (gone)
			set_bit(SAS_DEV_GONE, &dev->state);
		sas_unregister_dev(port, dev);
	}

	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
		sas_unregister_dev(port, dev);

	port->port->rphy = NULL;

}

void sas_device_set_phy(struct domain_device *dev, struct sas_port *port)
{
	struct sas_ha_struct *ha;
	struct sas_phy *new_phy;

	if (!dev)
		return;

	ha = dev->port->ha;
	new_phy = sas_port_get_phy(port);

	/* pin and record last seen phy */
	spin_lock_irq(&ha->phy_port_lock);
	if (new_phy) {
		sas_port_put_phy(dev->phy);
		dev->phy = new_phy;
	}
	spin_unlock_irq(&ha->phy_port_lock);
}

/* ---------- 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 = to_sas_discovery_event(work);
	struct asd_sas_port *port = ev->port;

	clear_bit(DISCE_DISCOVER_DOMAIN, &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;

		list_del_init(&dev->disco_list_node);
		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 = to_sas_discovery_event(work);
	struct asd_sas_port *port = ev->port;
	struct sas_ha_struct *ha = port->ha;

	/* prevent revalidation from finding sata links in recovery */
	mutex_lock(&ha->disco_mutex);
	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
		SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
			    port->id, task_pid_nr(current));
		goto out;
	}

	clear_bit(DISCE_REVALIDATE_DOMAIN, &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);
 out:
	mutex_unlock(&ha->disco_mutex);
}

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

static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw)
{
	/* chained work is not subject to SA_HA_DRAINING or
	 * SAS_HA_REGISTERED, because it is either submitted in the
	 * workqueue, or known to be submitted from a context that is
	 * not racing against draining
	 */
	scsi_queue_work(ha->core.shost, &sw->work);
}

static void sas_chain_event(int event, unsigned long *pending,
			    struct sas_work *sw,
			    struct sas_ha_struct *ha)
{
	if (!test_and_set_bit(event, pending)) {
		unsigned long flags;

		spin_lock_irqsave(&ha->state_lock, flags);
		sas_chain_work(ha, sw);
		spin_unlock_irqrestore(&ha->state_lock, flags);
	}
}

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_chain_event(ev, &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,
		[DISCE_PROBE] = sas_probe_devices,
		[DISCE_DESTRUCT] = sas_destruct_devices,
	};

	disc->pending = 0;
	for (i = 0; i < DISC_NUM_EVENTS; i++) {
		INIT_SAS_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	{
89d3cf6a JS	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	mutex_init(&dev->ex_dev.cmd_mutex);
	47	break;
	48	case SATA_DEV:
	49	case SATA_PM:
	50	case SATA_PM_PORT:
354cf829	51	case SATA_PENDING:
89d3cf6a JS	52	INIT_LIST_HEAD(&dev->sata_dev.children);
	53	break;
	54	default:
	55	break;
	56	}
2908d778 JB	57	}
2908d778 JB	58
2908d778 JB	59	/* ---------- Domain device discovery ---------- */
	60
	61	/**
	62	* sas_get_port_device -- Discover devices which caused port creation
	63	* @port: pointer to struct sas_port of interest
	64	*
	65	* Devices directly attached to a HA port, have no parent. This is
	66	* how we know they are (domain) "root" devices. All other devices
	67	* do, and should have their "parent" pointer set appropriately as
	68	* soon as a child device is discovered.
	69	*/
	70	static int sas_get_port_device(struct asd_sas_port *port)
	71	{
2908d778 JB	72	struct asd_sas_phy *phy;
	73	struct sas_rphy *rphy;
	74	struct domain_device *dev;
	75
735f7d2f	76	dev = sas_alloc_device();
2908d778 JB	77	if (!dev)
	78	return -ENOMEM;
	79
899fcf40	80	spin_lock_irq(&port->phy_list_lock);
2908d778	81	if (list_empty(&port->phy_list)) {
899fcf40	82	spin_unlock_irq(&port->phy_list_lock);
735f7d2f	83	sas_put_device(dev);
2908d778 JB	84	return -ENODEV;
	85	}
	86	phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
	87	spin_lock(&phy->frame_rcvd_lock);
	88	memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
	89	(size_t)phy->frame_rcvd_size));
	90	spin_unlock(&phy->frame_rcvd_lock);
899fcf40	91	spin_unlock_irq(&port->phy_list_lock);
2908d778 JB	92
	93	if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
	94	struct dev_to_host_fis *fis =
	95	(struct dev_to_host_fis *) dev->frame_rcvd;
	96	if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
	97	fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
	98	&& (fis->device & ~0x10) == 0)
	99	dev->dev_type = SATA_PM;
	100	else
	101	dev->dev_type = SATA_DEV;
5929faf3	102	dev->tproto = SAS_PROTOCOL_SATA;
2908d778 JB	103	} else {
	104	struct sas_identify_frame *id =
	105	(struct sas_identify_frame *) dev->frame_rcvd;
	106	dev->dev_type = id->dev_type;
	107	dev->iproto = id->initiator_bits;
	108	dev->tproto = id->target_bits;
	109	}
	110
	111	sas_init_dev(dev);
	112
	113	switch (dev->dev_type) {
	114	case SAS_END_DEV:
fa1c1e8f	115	case SATA_DEV:
2908d778 JB	116	rphy = sas_end_device_alloc(port->port);
	117	break;
	118	case EDGE_DEV:
	119	rphy = sas_expander_alloc(port->port,
	120	SAS_EDGE_EXPANDER_DEVICE);
	121	break;
	122	case FANOUT_DEV:
	123	rphy = sas_expander_alloc(port->port,
	124	SAS_FANOUT_EXPANDER_DEVICE);
	125	break;
2908d778 JB	126	default:
	127	printk("ERROR: Unidentified device type %d\n", dev->dev_type);
	128	rphy = NULL;
	129	break;
	130	}
	131
	132	if (!rphy) {
735f7d2f	133	sas_put_device(dev);
2908d778 JB	134	return -ENODEV;
2908d778 JB	135	}
899fcf40	136
2908d778 JB	137	rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
	138	memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
	139	sas_fill_in_rphy(dev, rphy);
	140	sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
	141	port->port_dev = dev;
	142	dev->port = port;
	143	dev->linkrate = port->linkrate;
	144	dev->min_linkrate = port->linkrate;
	145	dev->max_linkrate = port->linkrate;
	146	dev->pathways = port->num_phys;
	147	memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
	148	memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
	149	memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
	150	port->disc.max_level = 0;
f41a0c44	151	sas_device_set_phy(dev, port->port);
2908d778 JB	152
2908d778 JB	153	dev->rphy = rphy;
87c8331f	154
92625f9b	155	if (dev_is_sata(dev) \|\| dev->dev_type == SAS_END_DEV)
87c8331f DW	156	list_add_tail(&dev->disco_list_node, &port->disco_list);
	157	else {
	158	spin_lock_irq(&port->dev_list_lock);
	159	list_add_tail(&dev->dev_list_node, &port->dev_list);
	160	spin_unlock_irq(&port->dev_list_lock);
	161	}
2908d778	162
ec236e52 DW	163	spin_lock_irq(&port->phy_list_lock);
	164	list_for_each_entry(phy, &port->phy_list, port_phy_el)
	165	sas_phy_set_target(phy, dev);
	166	spin_unlock_irq(&port->phy_list_lock);
	167
2908d778 JB	168	return 0;
	169	}
	170
	171	/* ---------- Discover and Revalidate ---------- */
	172
2908d778 JB	173	int sas_notify_lldd_dev_found(struct domain_device *dev)
	174	{
	175	int res = 0;
	176	struct sas_ha_struct *sas_ha = dev->port->ha;
	177	struct Scsi_Host *shost = sas_ha->core.shost;
	178	struct sas_internal *i = to_sas_internal(shost->transportt);
	179
	180	if (i->dft->lldd_dev_found) {
	181	res = i->dft->lldd_dev_found(dev);
	182	if (res) {
	183	printk("sas: driver on pcidev %s cannot handle "
	184	"device %llx, error:%d\n",
71610f55	185	dev_name(sas_ha->dev),
2908d778 JB	186	SAS_ADDR(dev->sas_addr), res);
2908d778 JB	187	}
735f7d2f	188	kref_get(&dev->kref);
2908d778 JB	189	}
	190	return res;
	191	}
	192
	193
	194	void sas_notify_lldd_dev_gone(struct domain_device *dev)
	195	{
	196	struct sas_ha_struct *sas_ha = dev->port->ha;
	197	struct Scsi_Host *shost = sas_ha->core.shost;
	198	struct sas_internal *i = to_sas_internal(shost->transportt);
	199
735f7d2f	200	if (i->dft->lldd_dev_gone) {
2908d778	201	i->dft->lldd_dev_gone(dev);
735f7d2f DW	202	sas_put_device(dev);
735f7d2f DW	203	}
2908d778 JB	204	}
2908d778 JB	205
92625f9b DW	206	static void sas_probe_devices(struct work_struct *work)
	207	{
	208	struct domain_device dev, n;
22b9153f	209	struct sas_discovery_event *ev = to_sas_discovery_event(work);
92625f9b	210	struct asd_sas_port *port = ev->port;
2908d778	211
92625f9b DW	212	clear_bit(DISCE_PROBE, &port->disc.pending);
92625f9b DW	213
9508a66f DW	214	/* devices must be domain members before link recovery and probe */
9508a66f DW	215	list_for_each_entry(dev, &port->disco_list, disco_list_node) {
92625f9b DW	216	spin_lock_irq(&port->dev_list_lock);
	217	list_add_tail(&dev->dev_list_node, &port->dev_list);
	218	spin_unlock_irq(&port->dev_list_lock);
9508a66f	219	}
92625f9b	220
9508a66f	221	sas_probe_sata(port);
92625f9b	222
9508a66f DW	223	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
	224	int err;
	225
	226	err = sas_rphy_add(dev->rphy);
	227	if (err)
	228	sas_fail_probe(dev, __func__, err);
	229	else
92625f9b DW	230	list_del_init(&dev->disco_list_node);
	231	}
	232	}
2908d778 JB	233
	234	/**
	235	* sas_discover_end_dev -- discover an end device (SSP, etc)
	236	* @end: pointer to domain device of interest
	237	*
	238	* See comment in sas_discover_sata().
	239	*/
	240	int sas_discover_end_dev(struct domain_device *dev)
	241	{
	242	int res;
	243
	244	res = sas_notify_lldd_dev_found(dev);
	245	if (res)
92625f9b DW	246	return res;
92625f9b DW	247	sas_discover_event(dev->port, DISCE_PROBE);
2908d778	248
2908d778	249	return 0;
2908d778 JB	250	}
	251
	252	/* ---------- Device registration and unregistration ---------- */
	253
735f7d2f DW	254	void sas_free_device(struct kref *kref)
	255	{
	256	struct domain_device dev = container_of(kref, typeof(dev), kref);
	257
	258	if (dev->parent)
	259	sas_put_device(dev->parent);
	260
f41a0c44 DW	261	sas_port_put_phy(dev->phy);
	262	dev->phy = NULL;
	263
735f7d2f DW	264	/* remove the phys and ports, everything else should be gone */
	265	if (dev->dev_type == EDGE_DEV \|\| dev->dev_type == FANOUT_DEV)
	266	kfree(dev->ex_dev.ex_phy);
	267
8abda4d2 DW	268	if (dev_is_sata(dev) && dev->sata_dev.ap) {
	269	ata_sas_port_destroy(dev->sata_dev.ap);
	270	dev->sata_dev.ap = NULL;
	271	}
	272
735f7d2f DW	273	kfree(dev);
	274	}
	275
1a34c064	276	static void sas_unregister_common_dev(struct asd_sas_port port, struct domain_device dev)
2908d778 JB	277	{
	278	sas_notify_lldd_dev_gone(dev);
	279	if (!dev->parent)
	280	dev->port->port_dev = NULL;
	281	else
	282	list_del_init(&dev->siblings);
1a34c064 DW	283
1a34c064 DW	284	spin_lock_irq(&port->dev_list_lock);
2908d778	285	list_del_init(&dev->dev_list_node);
1a34c064	286	spin_unlock_irq(&port->dev_list_lock);
735f7d2f DW	287
735f7d2f DW	288	sas_put_device(dev);
2908d778 JB	289	}
2908d778 JB	290
87c8331f	291	static void sas_destruct_devices(struct work_struct *work)
2908d778	292	{
87c8331f	293	struct domain_device dev, n;
22b9153f	294	struct sas_discovery_event *ev = to_sas_discovery_event(work);
87c8331f DW	295	struct asd_sas_port *port = ev->port;
	296
	297	clear_bit(DISCE_DESTRUCT, &port->disc.pending);
	298
	299	list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
	300	list_del_init(&dev->disco_list_node);
	301
2908d778 JB	302	sas_remove_children(&dev->rphy->dev);
	303	sas_rphy_delete(dev->rphy);
	304	dev->rphy = NULL;
87c8331f	305	sas_unregister_common_dev(port, dev);
87c8331f DW	306	}
	307	}
	308
	309	void sas_unregister_dev(struct asd_sas_port port, struct domain_device dev)
	310	{
	311	if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
	312	!list_empty(&dev->disco_list_node)) {
	313	/* this rphy never saw sas_rphy_add */
	314	list_del_init(&dev->disco_list_node);
	315	sas_rphy_free(dev->rphy);
	316	dev->rphy = NULL;
	317	sas_unregister_common_dev(port, dev);
	318	}
	319
	320	if (dev->rphy && !test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
	321	sas_rphy_unlink(dev->rphy);
	322	list_move_tail(&dev->disco_list_node, &port->destroy_list);
	323	sas_discover_event(dev->port, DISCE_DESTRUCT);
2908d778	324	}
2908d778 JB	325	}
2908d778 JB	326
7d05919a	327	void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
2908d778 JB	328	{
	329	struct domain_device dev, n;
	330
7d05919a DW	331	list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
	332	if (gone)
	333	set_bit(SAS_DEV_GONE, &dev->state);
1a34c064	334	sas_unregister_dev(port, dev);
7d05919a DW	335	}
7d05919a DW	336
87c8331f DW	337	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
87c8331f DW	338	sas_unregister_dev(port, dev);
2908d778 JB	339
	340	port->port->rphy = NULL;
	341
	342	}
	343
f41a0c44 DW	344	void sas_device_set_phy(struct domain_device dev, struct sas_port port)
	345	{
	346	struct sas_ha_struct *ha;
	347	struct sas_phy *new_phy;
	348
	349	if (!dev)
	350	return;
	351
	352	ha = dev->port->ha;
	353	new_phy = sas_port_get_phy(port);
	354
	355	/* pin and record last seen phy */
	356	spin_lock_irq(&ha->phy_port_lock);
	357	if (new_phy) {
	358	sas_port_put_phy(dev->phy);
	359	dev->phy = new_phy;
	360	}
	361	spin_unlock_irq(&ha->phy_port_lock);
	362	}
	363
2908d778 JB	364	/* ---------- Discovery and Revalidation ---------- */
	365
	366	/**
	367	* sas_discover_domain -- discover the domain
	368	* @port: port to the domain of interest
	369	*
	370	* NOTE: this process _must_ quit (return) as soon as any connection
	371	* errors are encountered. Connection recovery is done elsewhere.
	372	* Discover process only interrogates devices in order to discover the
	373	* domain.
	374	*/
c4028958	375	static void sas_discover_domain(struct work_struct *work)
2908d778	376	{
6f63caae	377	struct domain_device *dev;
2908d778	378	int error = 0;
22b9153f	379	struct sas_discovery_event *ev = to_sas_discovery_event(work);
c4028958	380	struct asd_sas_port *port = ev->port;
2908d778	381
b15ebe0b	382	clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
2908d778 JB	383
2908d778 JB	384	if (port->port_dev)
6f63caae DW	385	return;
	386
	387	error = sas_get_port_device(port);
	388	if (error)
	389	return;
	390	dev = port->port_dev;
2908d778 JB	391
2908d778 JB	392	SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
ba25f9dc	393	task_pid_nr(current));
2908d778	394
6f63caae	395	switch (dev->dev_type) {
2908d778	396	case SAS_END_DEV:
6f63caae	397	error = sas_discover_end_dev(dev);
2908d778 JB	398	break;
	399	case EDGE_DEV:
	400	case FANOUT_DEV:
6f63caae	401	error = sas_discover_root_expander(dev);
2908d778 JB	402	break;
	403	case SATA_DEV:
	404	case SATA_PM:
15c73d5a	405	#ifdef CONFIG_SCSI_SAS_ATA
6f63caae	406	error = sas_discover_sata(dev);
2908d778	407	break;
15c73d5a JB	408	#else
	409	SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
	410	/* Fall through */
b9142174	411	#endif
2908d778	412	default:
b9142174	413	error = -ENXIO;
6f63caae	414	SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
2908d778 JB	415	break;
	416	}
	417
	418	if (error) {
6f63caae DW	419	sas_rphy_free(dev->rphy);
	420	dev->rphy = NULL;
	421
87c8331f	422	list_del_init(&dev->disco_list_node);
9d720d82	423	spin_lock_irq(&port->dev_list_lock);
6f63caae	424	list_del_init(&dev->dev_list_node);
9d720d82	425	spin_unlock_irq(&port->dev_list_lock);
88808398	426
735f7d2f	427	sas_put_device(dev);
2908d778 JB	428	port->port_dev = NULL;
	429	}
	430
	431	SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
ba25f9dc	432	task_pid_nr(current), error);
2908d778 JB	433	}
2908d778 JB	434
c4028958	435	static void sas_revalidate_domain(struct work_struct *work)
2908d778 JB	436	{
2908d778 JB	437	int res = 0;
22b9153f	438	struct sas_discovery_event *ev = to_sas_discovery_event(work);
c4028958	439	struct asd_sas_port *port = ev->port;
87c8331f DW	440	struct sas_ha_struct *ha = port->ha;
	441
	442	/* prevent revalidation from finding sata links in recovery */
	443	mutex_lock(&ha->disco_mutex);
	444	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
	445	SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
	446	port->id, task_pid_nr(current));
	447	goto out;
	448	}
2908d778	449
b15ebe0b	450	clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
2908d778 JB	451
2908d778 JB	452	SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
ba25f9dc	453	task_pid_nr(current));
87c8331f	454
2908d778 JB	455	if (port->port_dev)
	456	res = sas_ex_revalidate_domain(port->port_dev);
	457
	458	SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
ba25f9dc	459	port->id, task_pid_nr(current), res);
87c8331f DW	460	out:
87c8331f DW	461	mutex_unlock(&ha->disco_mutex);
2908d778 JB	462	}
	463
	464	/* ---------- Events ---------- */
	465
22b9153f	466	static void sas_chain_work(struct sas_ha_struct ha, struct sas_work sw)
b1124cd3	467	{
22b9153f DW	468	/* chained work is not subject to SA_HA_DRAINING or
	469	* SAS_HA_REGISTERED, because it is either submitted in the
	470	* workqueue, or known to be submitted from a context that is
	471	* not racing against draining
	472	*/
	473	scsi_queue_work(ha->core.shost, &sw->work);
b1124cd3 DW	474	}
	475
	476	static void sas_chain_event(int event, unsigned long *pending,
22b9153f	477	struct sas_work *sw,
b1124cd3 DW	478	struct sas_ha_struct *ha)
	479	{
	480	if (!test_and_set_bit(event, pending)) {
	481	unsigned long flags;
	482
	483	spin_lock_irqsave(&ha->state_lock, flags);
22b9153f	484	sas_chain_work(ha, sw);
b1124cd3 DW	485	spin_unlock_irqrestore(&ha->state_lock, flags);
	486	}
	487	}
	488
2908d778 JB	489	int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
	490	{
	491	struct sas_discovery *disc;
	492
	493	if (!port)
	494	return 0;
	495	disc = &port->disc;
	496
	497	BUG_ON(ev >= DISC_NUM_EVENTS);
	498
b1124cd3	499	sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
2908d778 JB	500
	501	return 0;
	502	}
	503
	504	/**
	505	* sas_init_disc -- initialize the discovery struct in the port
	506	* @port: pointer to struct port
	507	*
	508	* Called when the ports are being initialized.
	509	*/
	510	void sas_init_disc(struct sas_discovery disc, struct asd_sas_port port)
	511	{
	512	int i;
	513
c4028958	514	static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
2908d778 JB	515	[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
2908d778 JB	516	[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
92625f9b	517	[DISCE_PROBE] = sas_probe_devices,
87c8331f	518	[DISCE_DESTRUCT] = sas_destruct_devices,
2908d778 JB	519	};
2908d778 JB	520
2908d778	521	disc->pending = 0;
c4028958	522	for (i = 0; i < DISC_NUM_EVENTS; i++) {
22b9153f	523	INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
c4028958 DH	524	disc->disc_work[i].port = port;
c4028958 DH	525	}
2908d778	526	}