[GitHub/LineageOS/android_kernel_samsung_universal7580.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:
		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;
	sas_device_set_phy(dev, port->port);

	dev->rphy = rphy;

	if (dev_is_sata(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);
	}

	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);

	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 =
		container_of(work, struct 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);

		sas_put_device(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 =
		container_of(work, struct 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 =
		container_of(work, struct 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 work_struct *work)
{
	/* chained work is not subject to SA_HA_DRAINING or SAS_HA_REGISTERED */
	scsi_queue_work(ha->core.shost, work);
}

static void sas_chain_event(int event, unsigned long *pending,
			    struct work_struct *work,
			    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, work);
		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_sata,
		[DISCE_DESTRUCT] = sas_destruct_devices,
	};

	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	{
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:
	51	INIT_LIST_HEAD(&dev->sata_dev.children);
	52	break;
	53	default:
	54	break;
	55	}
2908d778 JB	56	}
2908d778 JB	57
2908d778 JB	58	/* ---------- Domain device discovery ---------- */
	59
	60	/**
	61	* sas_get_port_device -- Discover devices which caused port creation
	62	* @port: pointer to struct sas_port of interest
	63	*
	64	* Devices directly attached to a HA port, have no parent. This is
	65	* how we know they are (domain) "root" devices. All other devices
	66	* do, and should have their "parent" pointer set appropriately as
	67	* soon as a child device is discovered.
	68	*/
	69	static int sas_get_port_device(struct asd_sas_port *port)
	70	{
	71	unsigned long flags;
	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
	80	spin_lock_irqsave(&port->phy_list_lock, flags);
	81	if (list_empty(&port->phy_list)) {
	82	spin_unlock_irqrestore(&port->phy_list_lock, flags);
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);
	91	spin_unlock_irqrestore(&port->phy_list_lock, flags);
	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;
	135	}
	136	rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
	137	memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
	138	sas_fill_in_rphy(dev, rphy);
	139	sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
	140	port->port_dev = dev;
	141	dev->port = port;
	142	dev->linkrate = port->linkrate;
	143	dev->min_linkrate = port->linkrate;
	144	dev->max_linkrate = port->linkrate;
	145	dev->pathways = port->num_phys;
	146	memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
	147	memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
	148	memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
	149	port->disc.max_level = 0;
f41a0c44	150	sas_device_set_phy(dev, port->port);
2908d778 JB	151
2908d778 JB	152	dev->rphy = rphy;
87c8331f DW	153
	154	if (dev_is_sata(dev))
	155	list_add_tail(&dev->disco_list_node, &port->disco_list);
	156	else {
	157	spin_lock_irq(&port->dev_list_lock);
	158	list_add_tail(&dev->dev_list_node, &port->dev_list);
	159	spin_unlock_irq(&port->dev_list_lock);
	160	}
2908d778 JB	161
	162	return 0;
	163	}
	164
	165	/* ---------- Discover and Revalidate ---------- */
	166
2908d778 JB	167	int sas_notify_lldd_dev_found(struct domain_device *dev)
	168	{
	169	int res = 0;
	170	struct sas_ha_struct *sas_ha = dev->port->ha;
	171	struct Scsi_Host *shost = sas_ha->core.shost;
	172	struct sas_internal *i = to_sas_internal(shost->transportt);
	173
	174	if (i->dft->lldd_dev_found) {
	175	res = i->dft->lldd_dev_found(dev);
	176	if (res) {
	177	printk("sas: driver on pcidev %s cannot handle "
	178	"device %llx, error:%d\n",
71610f55	179	dev_name(sas_ha->dev),
2908d778 JB	180	SAS_ADDR(dev->sas_addr), res);
2908d778 JB	181	}
735f7d2f	182	kref_get(&dev->kref);
2908d778 JB	183	}
	184	return res;
	185	}
	186
	187
	188	void sas_notify_lldd_dev_gone(struct domain_device *dev)
	189	{
	190	struct sas_ha_struct *sas_ha = dev->port->ha;
	191	struct Scsi_Host *shost = sas_ha->core.shost;
	192	struct sas_internal *i = to_sas_internal(shost->transportt);
	193
735f7d2f	194	if (i->dft->lldd_dev_gone) {
2908d778	195	i->dft->lldd_dev_gone(dev);
735f7d2f DW	196	sas_put_device(dev);
735f7d2f DW	197	}
2908d778 JB	198	}
	199
	200	/* ---------- Common/dispatchers ---------- */
	201
2908d778 JB	202
	203	/**
	204	* sas_discover_end_dev -- discover an end device (SSP, etc)
	205	* @end: pointer to domain device of interest
	206	*
	207	* See comment in sas_discover_sata().
	208	*/
	209	int sas_discover_end_dev(struct domain_device *dev)
	210	{
	211	int res;
	212
	213	res = sas_notify_lldd_dev_found(dev);
	214	if (res)
88808398	215	goto out_err2;
2908d778 JB	216
	217	res = sas_rphy_add(dev->rphy);
	218	if (res)
	219	goto out_err;
	220
2908d778 JB	221	return 0;
	222
	223	out_err:
	224	sas_notify_lldd_dev_gone(dev);
88808398	225	out_err2:
2908d778 JB	226	return res;
	227	}
	228
	229	/* ---------- Device registration and unregistration ---------- */
	230
735f7d2f DW	231	void sas_free_device(struct kref *kref)
	232	{
	233	struct domain_device dev = container_of(kref, typeof(dev), kref);
	234
	235	if (dev->parent)
	236	sas_put_device(dev->parent);
	237
f41a0c44 DW	238	sas_port_put_phy(dev->phy);
	239	dev->phy = NULL;
	240
735f7d2f DW	241	/* remove the phys and ports, everything else should be gone */
	242	if (dev->dev_type == EDGE_DEV \|\| dev->dev_type == FANOUT_DEV)
	243	kfree(dev->ex_dev.ex_phy);
	244
8abda4d2 DW	245	if (dev_is_sata(dev) && dev->sata_dev.ap) {
	246	ata_sas_port_destroy(dev->sata_dev.ap);
	247	dev->sata_dev.ap = NULL;
	248	}
	249
735f7d2f DW	250	kfree(dev);
	251	}
	252
1a34c064	253	static void sas_unregister_common_dev(struct asd_sas_port port, struct domain_device dev)
2908d778 JB	254	{
	255	sas_notify_lldd_dev_gone(dev);
	256	if (!dev->parent)
	257	dev->port->port_dev = NULL;
	258	else
	259	list_del_init(&dev->siblings);
1a34c064 DW	260
1a34c064 DW	261	spin_lock_irq(&port->dev_list_lock);
2908d778	262	list_del_init(&dev->dev_list_node);
1a34c064	263	spin_unlock_irq(&port->dev_list_lock);
735f7d2f DW	264
735f7d2f DW	265	sas_put_device(dev);
2908d778 JB	266	}
2908d778 JB	267
87c8331f	268	static void sas_destruct_devices(struct work_struct *work)
2908d778	269	{
87c8331f DW	270	struct domain_device dev, n;
	271	struct sas_discovery_event *ev =
	272	container_of(work, struct sas_discovery_event, work);
	273	struct asd_sas_port *port = ev->port;
	274
	275	clear_bit(DISCE_DESTRUCT, &port->disc.pending);
	276
	277	list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
	278	list_del_init(&dev->disco_list_node);
	279
2908d778 JB	280	sas_remove_children(&dev->rphy->dev);
	281	sas_rphy_delete(dev->rphy);
	282	dev->rphy = NULL;
87c8331f DW	283	sas_unregister_common_dev(port, dev);
	284
	285	sas_put_device(dev);
	286	}
	287	}
	288
	289	void sas_unregister_dev(struct asd_sas_port port, struct domain_device dev)
	290	{
	291	if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
	292	!list_empty(&dev->disco_list_node)) {
	293	/* this rphy never saw sas_rphy_add */
	294	list_del_init(&dev->disco_list_node);
	295	sas_rphy_free(dev->rphy);
	296	dev->rphy = NULL;
	297	sas_unregister_common_dev(port, dev);
	298	}
	299
	300	if (dev->rphy && !test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
	301	sas_rphy_unlink(dev->rphy);
	302	list_move_tail(&dev->disco_list_node, &port->destroy_list);
	303	sas_discover_event(dev->port, DISCE_DESTRUCT);
2908d778	304	}
2908d778 JB	305	}
2908d778 JB	306
7d05919a	307	void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
2908d778 JB	308	{
	309	struct domain_device dev, n;
	310
7d05919a DW	311	list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
	312	if (gone)
	313	set_bit(SAS_DEV_GONE, &dev->state);
1a34c064	314	sas_unregister_dev(port, dev);
7d05919a DW	315	}
7d05919a DW	316
87c8331f DW	317	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
87c8331f DW	318	sas_unregister_dev(port, dev);
2908d778 JB	319
	320	port->port->rphy = NULL;
	321
	322	}
	323
f41a0c44 DW	324	void sas_device_set_phy(struct domain_device dev, struct sas_port port)
	325	{
	326	struct sas_ha_struct *ha;
	327	struct sas_phy *new_phy;
	328
	329	if (!dev)
	330	return;
	331
	332	ha = dev->port->ha;
	333	new_phy = sas_port_get_phy(port);
	334
	335	/* pin and record last seen phy */
	336	spin_lock_irq(&ha->phy_port_lock);
	337	if (new_phy) {
	338	sas_port_put_phy(dev->phy);
	339	dev->phy = new_phy;
	340	}
	341	spin_unlock_irq(&ha->phy_port_lock);
	342	}
	343
2908d778 JB	344	/* ---------- Discovery and Revalidation ---------- */
	345
	346	/**
	347	* sas_discover_domain -- discover the domain
	348	* @port: port to the domain of interest
	349	*
	350	* NOTE: this process _must_ quit (return) as soon as any connection
	351	* errors are encountered. Connection recovery is done elsewhere.
	352	* Discover process only interrogates devices in order to discover the
	353	* domain.
	354	*/
c4028958	355	static void sas_discover_domain(struct work_struct *work)
2908d778	356	{
6f63caae	357	struct domain_device *dev;
2908d778	358	int error = 0;
c4028958 DH	359	struct sas_discovery_event *ev =
	360	container_of(work, struct sas_discovery_event, work);
	361	struct asd_sas_port *port = ev->port;
2908d778	362
b15ebe0b	363	clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
2908d778 JB	364
2908d778 JB	365	if (port->port_dev)
6f63caae DW	366	return;
	367
	368	error = sas_get_port_device(port);
	369	if (error)
	370	return;
	371	dev = port->port_dev;
2908d778 JB	372
2908d778 JB	373	SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
ba25f9dc	374	task_pid_nr(current));
2908d778	375
6f63caae	376	switch (dev->dev_type) {
2908d778	377	case SAS_END_DEV:
6f63caae	378	error = sas_discover_end_dev(dev);
2908d778 JB	379	break;
	380	case EDGE_DEV:
	381	case FANOUT_DEV:
6f63caae	382	error = sas_discover_root_expander(dev);
2908d778 JB	383	break;
	384	case SATA_DEV:
	385	case SATA_PM:
15c73d5a	386	#ifdef CONFIG_SCSI_SAS_ATA
6f63caae	387	error = sas_discover_sata(dev);
2908d778	388	break;
15c73d5a JB	389	#else
	390	SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
	391	/* Fall through */
b9142174	392	#endif
2908d778	393	default:
b9142174	394	error = -ENXIO;
6f63caae	395	SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
2908d778 JB	396	break;
	397	}
	398
	399	if (error) {
6f63caae DW	400	sas_rphy_free(dev->rphy);
	401	dev->rphy = NULL;
	402
87c8331f	403	list_del_init(&dev->disco_list_node);
9d720d82	404	spin_lock_irq(&port->dev_list_lock);
6f63caae	405	list_del_init(&dev->dev_list_node);
9d720d82	406	spin_unlock_irq(&port->dev_list_lock);
88808398	407
735f7d2f	408	sas_put_device(dev);
2908d778 JB	409	port->port_dev = NULL;
	410	}
	411
	412	SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
ba25f9dc	413	task_pid_nr(current), error);
2908d778 JB	414	}
2908d778 JB	415
c4028958	416	static void sas_revalidate_domain(struct work_struct *work)
2908d778 JB	417	{
2908d778 JB	418	int res = 0;
c4028958 DH	419	struct sas_discovery_event *ev =
	420	container_of(work, struct sas_discovery_event, work);
	421	struct asd_sas_port *port = ev->port;
87c8331f DW	422	struct sas_ha_struct *ha = port->ha;
	423
	424	/* prevent revalidation from finding sata links in recovery */
	425	mutex_lock(&ha->disco_mutex);
	426	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
	427	SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
	428	port->id, task_pid_nr(current));
	429	goto out;
	430	}
2908d778	431
b15ebe0b	432	clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
2908d778 JB	433
2908d778 JB	434	SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
ba25f9dc	435	task_pid_nr(current));
87c8331f	436
2908d778 JB	437	if (port->port_dev)
	438	res = sas_ex_revalidate_domain(port->port_dev);
	439
	440	SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
ba25f9dc	441	port->id, task_pid_nr(current), res);
87c8331f DW	442	out:
87c8331f DW	443	mutex_unlock(&ha->disco_mutex);
2908d778 JB	444	}
	445
	446	/* ---------- Events ---------- */
	447
b1124cd3 DW	448	static void sas_chain_work(struct sas_ha_struct ha, struct work_struct work)
	449	{
	450	/* chained work is not subject to SA_HA_DRAINING or SAS_HA_REGISTERED */
	451	scsi_queue_work(ha->core.shost, work);
	452	}
	453
	454	static void sas_chain_event(int event, unsigned long *pending,
	455	struct work_struct *work,
	456	struct sas_ha_struct *ha)
	457	{
	458	if (!test_and_set_bit(event, pending)) {
	459	unsigned long flags;
	460
	461	spin_lock_irqsave(&ha->state_lock, flags);
	462	sas_chain_work(ha, work);
	463	spin_unlock_irqrestore(&ha->state_lock, flags);
	464	}
	465	}
	466
2908d778 JB	467	int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
	468	{
	469	struct sas_discovery *disc;
	470
	471	if (!port)
	472	return 0;
	473	disc = &port->disc;
	474
	475	BUG_ON(ev >= DISC_NUM_EVENTS);
	476
b1124cd3	477	sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
2908d778 JB	478
	479	return 0;
	480	}
	481
	482	/**
	483	* sas_init_disc -- initialize the discovery struct in the port
	484	* @port: pointer to struct port
	485	*
	486	* Called when the ports are being initialized.
	487	*/
	488	void sas_init_disc(struct sas_discovery disc, struct asd_sas_port port)
	489	{
	490	int i;
	491
c4028958	492	static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
2908d778 JB	493	[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
2908d778 JB	494	[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
87c8331f DW	495	[DISCE_PROBE] = sas_probe_sata,
87c8331f DW	496	[DISCE_DESTRUCT] = sas_destruct_devices,
2908d778 JB	497	};
2908d778 JB	498
2908d778	499	disc->pending = 0;
c4028958 DH	500	for (i = 0; i < DISC_NUM_EVENTS; i++) {
	501	INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
	502	disc->disc_work[i].port = port;
	503	}
2908d778	504	}