[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / libsas / sas_port.c

/*
 * Serial Attached SCSI (SAS) Port class
 *
 * 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 "sas_internal.h"

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

/**
 * sas_form_port -- add this phy to a port
 * @phy: the phy of interest
 *
 * This function adds this phy to an existing port, thus creating a wide
 * port, or it creates a port and adds the phy to the port.
 */
static void sas_form_port(struct asd_sas_phy *phy)
{
	int i;
	struct sas_ha_struct *sas_ha = phy->ha;
	struct asd_sas_port *port = phy->port;
	struct sas_internal *si =
		to_sas_internal(sas_ha->core.shost->transportt);
	unsigned long flags;

	if (port) {
		if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
			   SAS_ADDR_SIZE) == 0)
			sas_deform_port(phy);
		else {
			SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
				    __FUNCTION__, phy->id, phy->port->id,
				    phy->port->num_phys);
			return;
		}
	}

	/* find a port */
	spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
	for (i = 0; i < sas_ha->num_phys; i++) {
		port = sas_ha->sas_port[i];
		spin_lock(&port->phy_list_lock);
		if (*(u64 *) port->sas_addr &&
		    memcmp(port->attached_sas_addr,
			   phy->attached_sas_addr, SAS_ADDR_SIZE) == 0 &&
		    port->num_phys > 0) {
			/* wide port */
			SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
				    port->id);
			break;
		} else if (*(u64 *) port->sas_addr == 0 && port->num_phys==0) {
			memcpy(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE);
			break;
		}
		spin_unlock(&port->phy_list_lock);
	}

	if (i >= sas_ha->num_phys) {
		printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
		       __FUNCTION__);
		spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
		return;
	}

	/* add the phy to the port */
	list_add_tail(&phy->port_phy_el, &port->phy_list);
	phy->port = port;
	port->num_phys++;
	port->phy_mask |= (1U << phy->id);

	if (!port->phy)
		port->phy = phy->phy;

	SAS_DPRINTK("phy%d added to port%d, phy_mask:0x%x\n", phy->id,
		    port->id, port->phy_mask);

	if (*(u64 *)port->attached_sas_addr == 0) {
		port->class = phy->class;
		memcpy(port->attached_sas_addr, phy->attached_sas_addr,
		       SAS_ADDR_SIZE);
		port->iproto = phy->iproto;
		port->tproto = phy->tproto;
		port->oob_mode = phy->oob_mode;
		port->linkrate = phy->linkrate;
	} else
		port->linkrate = max(port->linkrate, phy->linkrate);
	spin_unlock(&port->phy_list_lock);
	spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);

	if (!port->port) {
		port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
		BUG_ON(!port->port);
		sas_port_add(port->port);
	}
	sas_port_add_phy(port->port, phy->phy);

	if (port->port_dev)
		port->port_dev->pathways = port->num_phys;

	/* Tell the LLDD about this port formation. */
	if (si->dft->lldd_port_formed)
		si->dft->lldd_port_formed(phy);

	sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
}

/**
 * sas_deform_port -- remove this phy from the port it belongs to
 * @phy: the phy of interest
 *
 * This is called when the physical link to the other phy has been
 * lost (on this phy), in Event thread context. We cannot delay here.
 */
void sas_deform_port(struct asd_sas_phy *phy)
{
	struct sas_ha_struct *sas_ha = phy->ha;
	struct asd_sas_port *port = phy->port;
	struct sas_internal *si =
		to_sas_internal(sas_ha->core.shost->transportt);
	unsigned long flags;

	if (!port)
		return;		  /* done by a phy event */

	if (port->port_dev)
		port->port_dev->pathways--;

	if (port->num_phys == 1) {
		sas_unregister_domain_devices(port);
		sas_port_delete(port->port);
		port->port = NULL;
	} else
		sas_port_delete_phy(port->port, phy->phy);


	if (si->dft->lldd_port_deformed)
		si->dft->lldd_port_deformed(phy);

	spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
	spin_lock(&port->phy_list_lock);

	list_del_init(&phy->port_phy_el);
	phy->port = NULL;
	port->num_phys--;
	port->phy_mask &= ~(1U << phy->id);

	if (port->num_phys == 0) {
		INIT_LIST_HEAD(&port->phy_list);
		memset(port->sas_addr, 0, SAS_ADDR_SIZE);
		memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
		port->class = 0;
		port->iproto = 0;
		port->tproto = 0;
		port->oob_mode = 0;
		port->phy_mask = 0;
	}
	spin_unlock(&port->phy_list_lock);
	spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);

	return;
}

/* ---------- SAS port events ---------- */

void sas_porte_bytes_dmaed(struct work_struct *work)
{
	struct asd_sas_event *ev =
		container_of(work, struct asd_sas_event, work);
	struct asd_sas_phy *phy = ev->phy;

	sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
			&phy->port_events_pending);

	sas_form_port(phy);
}

void sas_porte_broadcast_rcvd(struct work_struct *work)
{
	struct asd_sas_event *ev =
		container_of(work, struct asd_sas_event, work);
	struct asd_sas_phy *phy = ev->phy;
	unsigned long flags;
	u32 prim;

	sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
			&phy->port_events_pending);

	spin_lock_irqsave(&phy->sas_prim_lock, flags);
	prim = phy->sas_prim;
	spin_unlock_irqrestore(&phy->sas_prim_lock, flags);

	SAS_DPRINTK("broadcast received: %d\n", prim);
	sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
}

void sas_porte_link_reset_err(struct work_struct *work)
{
	struct asd_sas_event *ev =
		container_of(work, struct asd_sas_event, work);
	struct asd_sas_phy *phy = ev->phy;

	sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
			&phy->port_events_pending);

	sas_deform_port(phy);
}

void sas_porte_timer_event(struct work_struct *work)
{
	struct asd_sas_event *ev =
		container_of(work, struct asd_sas_event, work);
	struct asd_sas_phy *phy = ev->phy;

	sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
			&phy->port_events_pending);

	sas_deform_port(phy);
}

void sas_porte_hard_reset(struct work_struct *work)
{
	struct asd_sas_event *ev =
		container_of(work, struct asd_sas_event, work);
	struct asd_sas_phy *phy = ev->phy;

	sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
			&phy->port_events_pending);

	sas_deform_port(phy);
}

/* ---------- SAS port registration ---------- */

static void sas_init_port(struct asd_sas_port *port,
			  struct sas_ha_struct *sas_ha, int i)
{
	port->id = i;
	INIT_LIST_HEAD(&port->dev_list);
	spin_lock_init(&port->phy_list_lock);
	INIT_LIST_HEAD(&port->phy_list);
	port->num_phys = 0;
	port->phy_mask = 0;
	port->ha = sas_ha;

	spin_lock_init(&port->dev_list_lock);
}

int sas_register_ports(struct sas_ha_struct *sas_ha)
{
	int i;

	/* initialize the ports and discovery */
	for (i = 0; i < sas_ha->num_phys; i++) {
		struct asd_sas_port *port = sas_ha->sas_port[i];

		sas_init_port(port, sas_ha, i);
		sas_init_disc(&port->disc, port);
	}
	return 0;
}

void sas_unregister_ports(struct sas_ha_struct *sas_ha)
{
	int i;

	for (i = 0; i < sas_ha->num_phys; i++)
		if (sas_ha->sas_phy[i]->port)
			sas_deform_port(sas_ha->sas_phy[i]);

}
Commit	Line	Data
2908d778 JB	1	/*
	2	* Serial Attached SCSI (SAS) Port class
	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
	25	#include "sas_internal.h"
	26
	27	#include <scsi/scsi_transport.h>
	28	#include <scsi/scsi_transport_sas.h>
	29	#include "../scsi_sas_internal.h"
	30
	31	/**
	32	* sas_form_port -- add this phy to a port
	33	* @phy: the phy of interest
	34	*
	35	* This function adds this phy to an existing port, thus creating a wide
	36	* port, or it creates a port and adds the phy to the port.
	37	*/
	38	static void sas_form_port(struct asd_sas_phy *phy)
	39	{
	40	int i;
	41	struct sas_ha_struct *sas_ha = phy->ha;
	42	struct asd_sas_port *port = phy->port;
	43	struct sas_internal *si =
	44	to_sas_internal(sas_ha->core.shost->transportt);
980fa2f9	45	unsigned long flags;
2908d778 JB	46
	47	if (port) {
	48	if (memcmp(port->attached_sas_addr, phy->attached_sas_addr,
	49	SAS_ADDR_SIZE) == 0)
	50	sas_deform_port(phy);
	51	else {
	52	SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n",
	53	__FUNCTION__, phy->id, phy->port->id,
	54	phy->port->num_phys);
	55	return;
	56	}
	57	}
	58
	59	/* find a port */
980fa2f9	60	spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
2908d778 JB	61	for (i = 0; i < sas_ha->num_phys; i++) {
	62	port = sas_ha->sas_port[i];
	63	spin_lock(&port->phy_list_lock);
	64	if ((u64 ) port->sas_addr &&
	65	memcmp(port->attached_sas_addr,
	66	phy->attached_sas_addr, SAS_ADDR_SIZE) == 0 &&
	67	port->num_phys > 0) {
	68	/* wide port */
	69	SAS_DPRINTK("phy%d matched wide port%d\n", phy->id,
	70	port->id);
	71	break;
	72	} else if ((u64 ) port->sas_addr == 0 && port->num_phys==0) {
	73	memcpy(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE);
	74	break;
	75	}
	76	spin_unlock(&port->phy_list_lock);
	77	}
	78
	79	if (i >= sas_ha->num_phys) {
	80	printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n",
	81	__FUNCTION__);
980fa2f9	82	spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
2908d778 JB	83	return;
	84	}
	85
	86	/* add the phy to the port */
	87	list_add_tail(&phy->port_phy_el, &port->phy_list);
	88	phy->port = port;
	89	port->num_phys++;
	90	port->phy_mask \|= (1U << phy->id);
	91
	92	if (!port->phy)
	93	port->phy = phy->phy;
	94
	95	SAS_DPRINTK("phy%d added to port%d, phy_mask:0x%x\n", phy->id,
	96	port->id, port->phy_mask);
	97
	98	if ((u64 )port->attached_sas_addr == 0) {
	99	port->class = phy->class;
	100	memcpy(port->attached_sas_addr, phy->attached_sas_addr,
	101	SAS_ADDR_SIZE);
	102	port->iproto = phy->iproto;
	103	port->tproto = phy->tproto;
	104	port->oob_mode = phy->oob_mode;
	105	port->linkrate = phy->linkrate;
	106	} else
	107	port->linkrate = max(port->linkrate, phy->linkrate);
	108	spin_unlock(&port->phy_list_lock);
980fa2f9	109	spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
2908d778 JB	110
	111	if (!port->port) {
	112	port->port = sas_port_alloc(phy->phy->dev.parent, port->id);
	113	BUG_ON(!port->port);
	114	sas_port_add(port->port);
	115	}
	116	sas_port_add_phy(port->port, phy->phy);
	117
	118	if (port->port_dev)
	119	port->port_dev->pathways = port->num_phys;
	120
	121	/* Tell the LLDD about this port formation. */
	122	if (si->dft->lldd_port_formed)
	123	si->dft->lldd_port_formed(phy);
	124
	125	sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN);
	126	}
	127
	128	/**
	129	* sas_deform_port -- remove this phy from the port it belongs to
	130	* @phy: the phy of interest
	131	*
	132	* This is called when the physical link to the other phy has been
	133	* lost (on this phy), in Event thread context. We cannot delay here.
	134	*/
	135	void sas_deform_port(struct asd_sas_phy *phy)
	136	{
	137	struct sas_ha_struct *sas_ha = phy->ha;
	138	struct asd_sas_port *port = phy->port;
	139	struct sas_internal *si =
	140	to_sas_internal(sas_ha->core.shost->transportt);
980fa2f9	141	unsigned long flags;
2908d778 JB	142
	143	if (!port)
	144	return; /* done by a phy event */
	145
	146	if (port->port_dev)
	147	port->port_dev->pathways--;
	148
	149	if (port->num_phys == 1) {
	150	sas_unregister_domain_devices(port);
	151	sas_port_delete(port->port);
	152	port->port = NULL;
	153	} else
	154	sas_port_delete_phy(port->port, phy->phy);
	155
	156
	157	if (si->dft->lldd_port_deformed)
	158	si->dft->lldd_port_deformed(phy);
	159
980fa2f9	160	spin_lock_irqsave(&sas_ha->phy_port_lock, flags);
2908d778 JB	161	spin_lock(&port->phy_list_lock);
	162
	163	list_del_init(&phy->port_phy_el);
	164	phy->port = NULL;
	165	port->num_phys--;
	166	port->phy_mask &= ~(1U << phy->id);
	167
	168	if (port->num_phys == 0) {
	169	INIT_LIST_HEAD(&port->phy_list);
	170	memset(port->sas_addr, 0, SAS_ADDR_SIZE);
	171	memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE);
	172	port->class = 0;
	173	port->iproto = 0;
	174	port->tproto = 0;
	175	port->oob_mode = 0;
	176	port->phy_mask = 0;
	177	}
	178	spin_unlock(&port->phy_list_lock);
980fa2f9	179	spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags);
2908d778 JB	180
	181	return;
	182	}
	183
	184	/* ---------- SAS port events ---------- */
	185
c4028958	186	void sas_porte_bytes_dmaed(struct work_struct *work)
2908d778	187	{
c4028958 DH	188	struct asd_sas_event *ev =
	189	container_of(work, struct asd_sas_event, work);
	190	struct asd_sas_phy *phy = ev->phy;
2908d778 JB	191
	192	sas_begin_event(PORTE_BYTES_DMAED, &phy->ha->event_lock,
	193	&phy->port_events_pending);
	194
	195	sas_form_port(phy);
	196	}
	197
c4028958	198	void sas_porte_broadcast_rcvd(struct work_struct *work)
2908d778	199	{
c4028958 DH	200	struct asd_sas_event *ev =
	201	container_of(work, struct asd_sas_event, work);
	202	struct asd_sas_phy *phy = ev->phy;
2908d778 JB	203	unsigned long flags;
2908d778 JB	204	u32 prim;
2908d778 JB	205
	206	sas_begin_event(PORTE_BROADCAST_RCVD, &phy->ha->event_lock,
	207	&phy->port_events_pending);
	208
	209	spin_lock_irqsave(&phy->sas_prim_lock, flags);
	210	prim = phy->sas_prim;
	211	spin_unlock_irqrestore(&phy->sas_prim_lock, flags);
	212
	213	SAS_DPRINTK("broadcast received: %d\n", prim);
	214	sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN);
	215	}
	216
c4028958	217	void sas_porte_link_reset_err(struct work_struct *work)
2908d778	218	{
c4028958 DH	219	struct asd_sas_event *ev =
	220	container_of(work, struct asd_sas_event, work);
	221	struct asd_sas_phy *phy = ev->phy;
2908d778 JB	222
	223	sas_begin_event(PORTE_LINK_RESET_ERR, &phy->ha->event_lock,
	224	&phy->port_events_pending);
	225
	226	sas_deform_port(phy);
	227	}
	228
c4028958	229	void sas_porte_timer_event(struct work_struct *work)
2908d778	230	{
c4028958 DH	231	struct asd_sas_event *ev =
	232	container_of(work, struct asd_sas_event, work);
	233	struct asd_sas_phy *phy = ev->phy;
2908d778 JB	234
	235	sas_begin_event(PORTE_TIMER_EVENT, &phy->ha->event_lock,
	236	&phy->port_events_pending);
	237
	238	sas_deform_port(phy);
	239	}
	240
c4028958	241	void sas_porte_hard_reset(struct work_struct *work)
2908d778	242	{
c4028958 DH	243	struct asd_sas_event *ev =
	244	container_of(work, struct asd_sas_event, work);
	245	struct asd_sas_phy *phy = ev->phy;
2908d778 JB	246
	247	sas_begin_event(PORTE_HARD_RESET, &phy->ha->event_lock,
	248	&phy->port_events_pending);
	249
	250	sas_deform_port(phy);
	251	}
	252
	253	/* ---------- SAS port registration ---------- */
	254
	255	static void sas_init_port(struct asd_sas_port *port,
	256	struct sas_ha_struct *sas_ha, int i)
	257	{
	258	port->id = i;
	259	INIT_LIST_HEAD(&port->dev_list);
	260	spin_lock_init(&port->phy_list_lock);
	261	INIT_LIST_HEAD(&port->phy_list);
	262	port->num_phys = 0;
	263	port->phy_mask = 0;
	264	port->ha = sas_ha;
	265
	266	spin_lock_init(&port->dev_list_lock);
	267	}
	268
	269	int sas_register_ports(struct sas_ha_struct *sas_ha)
	270	{
	271	int i;
	272
	273	/* initialize the ports and discovery */
	274	for (i = 0; i < sas_ha->num_phys; i++) {
	275	struct asd_sas_port *port = sas_ha->sas_port[i];
	276
	277	sas_init_port(port, sas_ha, i);
	278	sas_init_disc(&port->disc, port);
	279	}
	280	return 0;
	281	}
	282
	283	void sas_unregister_ports(struct sas_ha_struct *sas_ha)
	284	{
	285	int i;
	286
	287	for (i = 0; i < sas_ha->num_phys; i++)
	288	if (sas_ha->sas_phy[i]->port)
	289	sas_deform_port(sas_ha->sas_phy[i]);
	290
	291	}