[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:
		INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
		break;
	case EDGE_DEV:
	case FANOUT_DEV:
		INIT_LIST_HEAD(&dev->ex_dev.children);
		mutex_init(&dev->ex_dev.cmd_mutex);
		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;
	int rc = -ENODEV;

	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);

	dev->port = port;
	switch (dev->dev_type) {
	case SATA_DEV:
		rc = sas_ata_init(dev);
		if (rc) {
			rphy = NULL;
			break;
		}
		/* fall through */
	case SAS_END_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 rc;
	}

	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->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;
	get_device(&dev->rphy->dev);

	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);

	put_device(&dev->rphy->dev);
	dev->rphy = NULL;

	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)
{
	struct sas_ha_struct *ha = port->ha;

	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);
	if (dev_is_sata(dev))
		sas_ata_end_eh(dev->sata_dev.ap);
	spin_unlock_irq(&port->dev_list_lock);

	spin_lock_irq(&ha->lock);
	if (dev->dev_type == SAS_END_DEV &&
	    !list_empty(&dev->ssp_dev.eh_list_node)) {
		list_del_init(&dev->ssp_dev.eh_list_node);
		ha->eh_active--;
	}
	spin_unlock_irq(&ha->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);
		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);
		sas_unregister_common_dev(port, dev);
		return;
	}

	if (!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);
		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->lock, flags);
		sas_chain_work(ha, sw);
		spin_unlock_irqrestore(&ha->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) {
89d3cf6a JS	41	case SAS_END_DEV:
5db45bdc	42	INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node);
89d3cf6a JS	43	break;
	44	case EDGE_DEV:
	45	case FANOUT_DEV:
	46	INIT_LIST_HEAD(&dev->ex_dev.children);
	47	mutex_init(&dev->ex_dev.cmd_mutex);
	48	break;
89d3cf6a JS	49	default:
	50	break;
	51	}
2908d778 JB	52	}
2908d778 JB	53
2908d778 JB	54	/* ---------- Domain device discovery ---------- */
	55
	56	/**
	57	* sas_get_port_device -- Discover devices which caused port creation
	58	* @port: pointer to struct sas_port of interest
	59	*
	60	* Devices directly attached to a HA port, have no parent. This is
	61	* how we know they are (domain) "root" devices. All other devices
	62	* do, and should have their "parent" pointer set appropriately as
	63	* soon as a child device is discovered.
	64	*/
	65	static int sas_get_port_device(struct asd_sas_port *port)
	66	{
2908d778 JB	67	struct asd_sas_phy *phy;
	68	struct sas_rphy *rphy;
	69	struct domain_device *dev;
b2024459	70	int rc = -ENODEV;
2908d778	71
735f7d2f	72	dev = sas_alloc_device();
2908d778 JB	73	if (!dev)
	74	return -ENOMEM;
	75
899fcf40	76	spin_lock_irq(&port->phy_list_lock);
2908d778	77	if (list_empty(&port->phy_list)) {
899fcf40	78	spin_unlock_irq(&port->phy_list_lock);
735f7d2f	79	sas_put_device(dev);
2908d778 JB	80	return -ENODEV;
	81	}
	82	phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
	83	spin_lock(&phy->frame_rcvd_lock);
	84	memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
	85	(size_t)phy->frame_rcvd_size));
	86	spin_unlock(&phy->frame_rcvd_lock);
899fcf40	87	spin_unlock_irq(&port->phy_list_lock);
2908d778 JB	88
	89	if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
	90	struct dev_to_host_fis *fis =
	91	(struct dev_to_host_fis *) dev->frame_rcvd;
	92	if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
	93	fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
	94	&& (fis->device & ~0x10) == 0)
	95	dev->dev_type = SATA_PM;
	96	else
	97	dev->dev_type = SATA_DEV;
5929faf3	98	dev->tproto = SAS_PROTOCOL_SATA;
2908d778 JB	99	} else {
	100	struct sas_identify_frame *id =
	101	(struct sas_identify_frame *) dev->frame_rcvd;
	102	dev->dev_type = id->dev_type;
	103	dev->iproto = id->initiator_bits;
	104	dev->tproto = id->target_bits;
	105	}
	106
	107	sas_init_dev(dev);
	108
b2024459	109	dev->port = port;
2908d778	110	switch (dev->dev_type) {
fa1c1e8f	111	case SATA_DEV:
b2024459 DW	112	rc = sas_ata_init(dev);
	113	if (rc) {
	114	rphy = NULL;
	115	break;
	116	}
	117	/* fall through */
	118	case SAS_END_DEV:
2908d778 JB	119	rphy = sas_end_device_alloc(port->port);
	120	break;
	121	case EDGE_DEV:
	122	rphy = sas_expander_alloc(port->port,
	123	SAS_EDGE_EXPANDER_DEVICE);
	124	break;
	125	case FANOUT_DEV:
	126	rphy = sas_expander_alloc(port->port,
	127	SAS_FANOUT_EXPANDER_DEVICE);
	128	break;
2908d778 JB	129	default:
	130	printk("ERROR: Unidentified device type %d\n", dev->dev_type);
	131	rphy = NULL;
	132	break;
	133	}
	134
	135	if (!rphy) {
735f7d2f	136	sas_put_device(dev);
b2024459	137	return rc;
2908d778	138	}
899fcf40	139
2908d778 JB	140	rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
	141	memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
	142	sas_fill_in_rphy(dev, rphy);
	143	sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
	144	port->port_dev = dev;
2908d778 JB	145	dev->linkrate = port->linkrate;
	146	dev->min_linkrate = port->linkrate;
	147	dev->max_linkrate = port->linkrate;
	148	dev->pathways = port->num_phys;
	149	memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
	150	memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
	151	memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
	152	port->disc.max_level = 0;
f41a0c44	153	sas_device_set_phy(dev, port->port);
2908d778 JB	154
2908d778 JB	155	dev->rphy = rphy;
9487669f	156	get_device(&dev->rphy->dev);
87c8331f	157
92625f9b	158	if (dev_is_sata(dev) \|\| dev->dev_type == SAS_END_DEV)
87c8331f DW	159	list_add_tail(&dev->disco_list_node, &port->disco_list);
	160	else {
	161	spin_lock_irq(&port->dev_list_lock);
	162	list_add_tail(&dev->dev_list_node, &port->dev_list);
	163	spin_unlock_irq(&port->dev_list_lock);
	164	}
2908d778	165
ec236e52 DW	166	spin_lock_irq(&port->phy_list_lock);
	167	list_for_each_entry(phy, &port->phy_list, port_phy_el)
	168	sas_phy_set_target(phy, dev);
	169	spin_unlock_irq(&port->phy_list_lock);
	170
2908d778 JB	171	return 0;
	172	}
	173
	174	/* ---------- Discover and Revalidate ---------- */
	175
2908d778 JB	176	int sas_notify_lldd_dev_found(struct domain_device *dev)
	177	{
	178	int res = 0;
	179	struct sas_ha_struct *sas_ha = dev->port->ha;
	180	struct Scsi_Host *shost = sas_ha->core.shost;
	181	struct sas_internal *i = to_sas_internal(shost->transportt);
	182
	183	if (i->dft->lldd_dev_found) {
	184	res = i->dft->lldd_dev_found(dev);
	185	if (res) {
	186	printk("sas: driver on pcidev %s cannot handle "
	187	"device %llx, error:%d\n",
71610f55	188	dev_name(sas_ha->dev),
2908d778 JB	189	SAS_ADDR(dev->sas_addr), res);
2908d778 JB	190	}
735f7d2f	191	kref_get(&dev->kref);
2908d778 JB	192	}
	193	return res;
	194	}
	195
	196
	197	void sas_notify_lldd_dev_gone(struct domain_device *dev)
	198	{
	199	struct sas_ha_struct *sas_ha = dev->port->ha;
	200	struct Scsi_Host *shost = sas_ha->core.shost;
	201	struct sas_internal *i = to_sas_internal(shost->transportt);
	202
735f7d2f	203	if (i->dft->lldd_dev_gone) {
2908d778	204	i->dft->lldd_dev_gone(dev);
735f7d2f DW	205	sas_put_device(dev);
735f7d2f DW	206	}
2908d778 JB	207	}
2908d778 JB	208
92625f9b DW	209	static void sas_probe_devices(struct work_struct *work)
	210	{
	211	struct domain_device dev, n;
22b9153f	212	struct sas_discovery_event *ev = to_sas_discovery_event(work);
92625f9b	213	struct asd_sas_port *port = ev->port;
2908d778	214
92625f9b DW	215	clear_bit(DISCE_PROBE, &port->disc.pending);
92625f9b DW	216
9508a66f DW	217	/* devices must be domain members before link recovery and probe */
9508a66f DW	218	list_for_each_entry(dev, &port->disco_list, disco_list_node) {
92625f9b DW	219	spin_lock_irq(&port->dev_list_lock);
	220	list_add_tail(&dev->dev_list_node, &port->dev_list);
	221	spin_unlock_irq(&port->dev_list_lock);
9508a66f	222	}
92625f9b	223
9508a66f	224	sas_probe_sata(port);
92625f9b	225
9508a66f DW	226	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
	227	int err;
	228
	229	err = sas_rphy_add(dev->rphy);
	230	if (err)
	231	sas_fail_probe(dev, __func__, err);
	232	else
92625f9b DW	233	list_del_init(&dev->disco_list_node);
	234	}
	235	}
2908d778 JB	236
	237	/**
	238	* sas_discover_end_dev -- discover an end device (SSP, etc)
	239	* @end: pointer to domain device of interest
	240	*
	241	* See comment in sas_discover_sata().
	242	*/
	243	int sas_discover_end_dev(struct domain_device *dev)
	244	{
	245	int res;
	246
	247	res = sas_notify_lldd_dev_found(dev);
	248	if (res)
92625f9b DW	249	return res;
92625f9b DW	250	sas_discover_event(dev->port, DISCE_PROBE);
2908d778	251
2908d778	252	return 0;
2908d778 JB	253	}
	254
	255	/* ---------- Device registration and unregistration ---------- */
	256
735f7d2f DW	257	void sas_free_device(struct kref *kref)
	258	{
	259	struct domain_device dev = container_of(kref, typeof(dev), kref);
	260
9487669f DW	261	put_device(&dev->rphy->dev);
	262	dev->rphy = NULL;
	263
735f7d2f DW	264	if (dev->parent)
	265	sas_put_device(dev->parent);
	266
f41a0c44 DW	267	sas_port_put_phy(dev->phy);
	268	dev->phy = NULL;
	269
735f7d2f DW	270	/* remove the phys and ports, everything else should be gone */
	271	if (dev->dev_type == EDGE_DEV \|\| dev->dev_type == FANOUT_DEV)
	272	kfree(dev->ex_dev.ex_phy);
	273
8abda4d2 DW	274	if (dev_is_sata(dev) && dev->sata_dev.ap) {
	275	ata_sas_port_destroy(dev->sata_dev.ap);
	276	dev->sata_dev.ap = NULL;
	277	}
	278
735f7d2f DW	279	kfree(dev);
	280	}
	281
1a34c064	282	static void sas_unregister_common_dev(struct asd_sas_port port, struct domain_device dev)
2908d778	283	{
5db45bdc DW	284	struct sas_ha_struct *ha = port->ha;
5db45bdc DW	285
2908d778 JB	286	sas_notify_lldd_dev_gone(dev);
	287	if (!dev->parent)
	288	dev->port->port_dev = NULL;
	289	else
	290	list_del_init(&dev->siblings);
1a34c064 DW	291
1a34c064 DW	292	spin_lock_irq(&port->dev_list_lock);
2908d778	293	list_del_init(&dev->dev_list_node);
e4a9c373 DW	294	if (dev_is_sata(dev))
e4a9c373 DW	295	sas_ata_end_eh(dev->sata_dev.ap);
1a34c064	296	spin_unlock_irq(&port->dev_list_lock);
735f7d2f	297
5db45bdc DW	298	spin_lock_irq(&ha->lock);
	299	if (dev->dev_type == SAS_END_DEV &&
	300	!list_empty(&dev->ssp_dev.eh_list_node)) {
	301	list_del_init(&dev->ssp_dev.eh_list_node);
	302	ha->eh_active--;
	303	}
	304	spin_unlock_irq(&ha->lock);
	305
735f7d2f	306	sas_put_device(dev);
2908d778 JB	307	}
2908d778 JB	308
87c8331f	309	static void sas_destruct_devices(struct work_struct *work)
2908d778	310	{
87c8331f	311	struct domain_device dev, n;
22b9153f	312	struct sas_discovery_event *ev = to_sas_discovery_event(work);
87c8331f DW	313	struct asd_sas_port *port = ev->port;
	314
	315	clear_bit(DISCE_DESTRUCT, &port->disc.pending);
	316
	317	list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) {
	318	list_del_init(&dev->disco_list_node);
	319
2908d778 JB	320	sas_remove_children(&dev->rphy->dev);
2908d778 JB	321	sas_rphy_delete(dev->rphy);
87c8331f	322	sas_unregister_common_dev(port, dev);
87c8331f DW	323	}
	324	}
	325
	326	void sas_unregister_dev(struct asd_sas_port port, struct domain_device dev)
	327	{
	328	if (!test_bit(SAS_DEV_DESTROY, &dev->state) &&
	329	!list_empty(&dev->disco_list_node)) {
	330	/* this rphy never saw sas_rphy_add */
	331	list_del_init(&dev->disco_list_node);
	332	sas_rphy_free(dev->rphy);
87c8331f	333	sas_unregister_common_dev(port, dev);
9487669f	334	return;
87c8331f DW	335	}
87c8331f DW	336
9487669f	337	if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) {
87c8331f DW	338	sas_rphy_unlink(dev->rphy);
	339	list_move_tail(&dev->disco_list_node, &port->destroy_list);
	340	sas_discover_event(dev->port, DISCE_DESTRUCT);
2908d778	341	}
2908d778 JB	342	}
2908d778 JB	343
7d05919a	344	void sas_unregister_domain_devices(struct asd_sas_port *port, int gone)
2908d778 JB	345	{
	346	struct domain_device dev, n;
	347
7d05919a DW	348	list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) {
	349	if (gone)
	350	set_bit(SAS_DEV_GONE, &dev->state);
1a34c064	351	sas_unregister_dev(port, dev);
7d05919a DW	352	}
7d05919a DW	353
87c8331f DW	354	list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node)
87c8331f DW	355	sas_unregister_dev(port, dev);
2908d778 JB	356
	357	port->port->rphy = NULL;
	358
	359	}
	360
f41a0c44 DW	361	void sas_device_set_phy(struct domain_device dev, struct sas_port port)
	362	{
	363	struct sas_ha_struct *ha;
	364	struct sas_phy *new_phy;
	365
	366	if (!dev)
	367	return;
	368
	369	ha = dev->port->ha;
	370	new_phy = sas_port_get_phy(port);
	371
	372	/* pin and record last seen phy */
	373	spin_lock_irq(&ha->phy_port_lock);
	374	if (new_phy) {
	375	sas_port_put_phy(dev->phy);
	376	dev->phy = new_phy;
	377	}
	378	spin_unlock_irq(&ha->phy_port_lock);
	379	}
	380
2908d778 JB	381	/* ---------- Discovery and Revalidation ---------- */
	382
	383	/**
	384	* sas_discover_domain -- discover the domain
	385	* @port: port to the domain of interest
	386	*
	387	* NOTE: this process _must_ quit (return) as soon as any connection
	388	* errors are encountered. Connection recovery is done elsewhere.
	389	* Discover process only interrogates devices in order to discover the
	390	* domain.
	391	*/
c4028958	392	static void sas_discover_domain(struct work_struct *work)
2908d778	393	{
6f63caae	394	struct domain_device *dev;
2908d778	395	int error = 0;
22b9153f	396	struct sas_discovery_event *ev = to_sas_discovery_event(work);
c4028958	397	struct asd_sas_port *port = ev->port;
2908d778	398
b15ebe0b	399	clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending);
2908d778 JB	400
2908d778 JB	401	if (port->port_dev)
6f63caae DW	402	return;
	403
	404	error = sas_get_port_device(port);
	405	if (error)
	406	return;
	407	dev = port->port_dev;
2908d778 JB	408
2908d778 JB	409	SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
ba25f9dc	410	task_pid_nr(current));
2908d778	411
6f63caae	412	switch (dev->dev_type) {
2908d778	413	case SAS_END_DEV:
6f63caae	414	error = sas_discover_end_dev(dev);
2908d778 JB	415	break;
	416	case EDGE_DEV:
	417	case FANOUT_DEV:
6f63caae	418	error = sas_discover_root_expander(dev);
2908d778 JB	419	break;
	420	case SATA_DEV:
	421	case SATA_PM:
15c73d5a	422	#ifdef CONFIG_SCSI_SAS_ATA
6f63caae	423	error = sas_discover_sata(dev);
2908d778	424	break;
15c73d5a JB	425	#else
	426	SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
	427	/* Fall through */
b9142174	428	#endif
2908d778	429	default:
b9142174	430	error = -ENXIO;
6f63caae	431	SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
2908d778 JB	432	break;
	433	}
	434
	435	if (error) {
6f63caae	436	sas_rphy_free(dev->rphy);
87c8331f	437	list_del_init(&dev->disco_list_node);
9d720d82	438	spin_lock_irq(&port->dev_list_lock);
6f63caae	439	list_del_init(&dev->dev_list_node);
9d720d82	440	spin_unlock_irq(&port->dev_list_lock);
88808398	441
735f7d2f	442	sas_put_device(dev);
2908d778 JB	443	port->port_dev = NULL;
	444	}
	445
	446	SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
ba25f9dc	447	task_pid_nr(current), error);
2908d778 JB	448	}
2908d778 JB	449
c4028958	450	static void sas_revalidate_domain(struct work_struct *work)
2908d778 JB	451	{
2908d778 JB	452	int res = 0;
22b9153f	453	struct sas_discovery_event *ev = to_sas_discovery_event(work);
c4028958	454	struct asd_sas_port *port = ev->port;
87c8331f DW	455	struct sas_ha_struct *ha = port->ha;
	456
	457	/* prevent revalidation from finding sata links in recovery */
	458	mutex_lock(&ha->disco_mutex);
	459	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
	460	SAS_DPRINTK("REVALIDATION DEFERRED on port %d, pid:%d\n",
	461	port->id, task_pid_nr(current));
	462	goto out;
	463	}
2908d778	464
b15ebe0b	465	clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending);
2908d778 JB	466
2908d778 JB	467	SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
ba25f9dc	468	task_pid_nr(current));
87c8331f	469
2908d778 JB	470	if (port->port_dev)
	471	res = sas_ex_revalidate_domain(port->port_dev);
	472
	473	SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
ba25f9dc	474	port->id, task_pid_nr(current), res);
87c8331f DW	475	out:
87c8331f DW	476	mutex_unlock(&ha->disco_mutex);
2908d778 JB	477	}
	478
	479	/* ---------- Events ---------- */
	480
22b9153f	481	static void sas_chain_work(struct sas_ha_struct ha, struct sas_work sw)
b1124cd3	482	{
22b9153f DW	483	/* chained work is not subject to SA_HA_DRAINING or
	484	* SAS_HA_REGISTERED, because it is either submitted in the
	485	* workqueue, or known to be submitted from a context that is
	486	* not racing against draining
	487	*/
	488	scsi_queue_work(ha->core.shost, &sw->work);
b1124cd3 DW	489	}
	490
	491	static void sas_chain_event(int event, unsigned long *pending,
22b9153f	492	struct sas_work *sw,
b1124cd3 DW	493	struct sas_ha_struct *ha)
	494	{
	495	if (!test_and_set_bit(event, pending)) {
	496	unsigned long flags;
	497
e4a9c373	498	spin_lock_irqsave(&ha->lock, flags);
22b9153f	499	sas_chain_work(ha, sw);
e4a9c373	500	spin_unlock_irqrestore(&ha->lock, flags);
b1124cd3 DW	501	}
	502	}
	503
2908d778 JB	504	int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
	505	{
	506	struct sas_discovery *disc;
	507
	508	if (!port)
	509	return 0;
	510	disc = &port->disc;
	511
	512	BUG_ON(ev >= DISC_NUM_EVENTS);
	513
b1124cd3	514	sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha);
2908d778 JB	515
	516	return 0;
	517	}
	518
	519	/**
	520	* sas_init_disc -- initialize the discovery struct in the port
	521	* @port: pointer to struct port
	522	*
	523	* Called when the ports are being initialized.
	524	*/
	525	void sas_init_disc(struct sas_discovery disc, struct asd_sas_port port)
	526	{
	527	int i;
	528
c4028958	529	static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
2908d778 JB	530	[DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
2908d778 JB	531	[DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
92625f9b	532	[DISCE_PROBE] = sas_probe_devices,
87c8331f	533	[DISCE_DESTRUCT] = sas_destruct_devices,
2908d778 JB	534	};
2908d778 JB	535
2908d778	536	disc->pending = 0;
c4028958	537	for (i = 0; i < DISC_NUM_EVENTS; i++) {
22b9153f	538	INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
c4028958 DH	539	disc->disc_work[i].port = port;
c4028958 DH	540	}
2908d778	541	}