2 * Serial Attached SCSI (SAS) Event processing
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 * This file is licensed under GPLv2.
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.
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.
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
25 #include <linux/export.h>
26 #include <scsi/scsi_host.h>
27 #include "sas_internal.h"
30 int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
34 if (!test_bit(SAS_HA_REGISTERED, &ha->state))
37 if (test_bit(SAS_HA_DRAINING, &ha->state)) {
38 /* add it to the defer list, if not already pending */
39 if (list_empty(&sw->drain_node))
40 list_add(&sw->drain_node, &ha->defer_q);
42 rc = scsi_queue_work(ha->core.shost, &sw->work);
47 static int sas_queue_event(int event, unsigned long *pending,
48 struct sas_work *work,
49 struct sas_ha_struct *ha)
53 if (!test_and_set_bit(event, pending)) {
56 spin_lock_irqsave(&ha->lock, flags);
57 rc = sas_queue_work(ha, work);
58 spin_unlock_irqrestore(&ha->lock, flags);
65 void __sas_drain_work(struct sas_ha_struct *ha)
67 struct workqueue_struct *wq = ha->core.shost->work_q;
68 struct sas_work *sw, *_sw;
70 set_bit(SAS_HA_DRAINING, &ha->state);
71 /* flush submitters */
72 spin_lock_irq(&ha->lock);
73 spin_unlock_irq(&ha->lock);
77 spin_lock_irq(&ha->lock);
78 clear_bit(SAS_HA_DRAINING, &ha->state);
79 list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
80 list_del_init(&sw->drain_node);
81 sas_queue_work(ha, sw);
83 spin_unlock_irq(&ha->lock);
86 int sas_drain_work(struct sas_ha_struct *ha)
90 err = mutex_lock_interruptible(&ha->drain_mutex);
93 if (test_bit(SAS_HA_REGISTERED, &ha->state))
95 mutex_unlock(&ha->drain_mutex);
99 EXPORT_SYMBOL_GPL(sas_drain_work);
101 void sas_disable_revalidation(struct sas_ha_struct *ha)
103 mutex_lock(&ha->disco_mutex);
104 set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
105 mutex_unlock(&ha->disco_mutex);
108 void sas_enable_revalidation(struct sas_ha_struct *ha)
112 mutex_lock(&ha->disco_mutex);
113 clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
114 for (i = 0; i < ha->num_phys; i++) {
115 struct asd_sas_port *port = ha->sas_port[i];
116 const int ev = DISCE_REVALIDATE_DOMAIN;
117 struct sas_discovery *d = &port->disc;
119 if (!test_and_clear_bit(ev, &d->pending))
122 sas_queue_event(ev, &d->pending, &d->disc_work[ev].work, ha);
124 mutex_unlock(&ha->disco_mutex);
127 static int notify_ha_event(struct sas_ha_struct *sas_ha, enum ha_event event)
129 BUG_ON(event >= HA_NUM_EVENTS);
131 return sas_queue_event(event, &sas_ha->pending,
132 &sas_ha->ha_events[event].work, sas_ha);
135 static int notify_port_event(struct asd_sas_phy *phy, enum port_event event)
137 struct sas_ha_struct *ha = phy->ha;
139 BUG_ON(event >= PORT_NUM_EVENTS);
141 return sas_queue_event(event, &phy->port_events_pending,
142 &phy->port_events[event].work, ha);
145 int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
147 struct sas_ha_struct *ha = phy->ha;
149 BUG_ON(event >= PHY_NUM_EVENTS);
151 return sas_queue_event(event, &phy->phy_events_pending,
152 &phy->phy_events[event].work, ha);
155 int sas_init_events(struct sas_ha_struct *sas_ha)
157 static const work_func_t sas_ha_event_fns[HA_NUM_EVENTS] = {
158 [HAE_RESET] = sas_hae_reset,
163 for (i = 0; i < HA_NUM_EVENTS; i++) {
164 INIT_SAS_WORK(&sas_ha->ha_events[i].work, sas_ha_event_fns[i]);
165 sas_ha->ha_events[i].ha = sas_ha;
168 sas_ha->notify_ha_event = notify_ha_event;
169 sas_ha->notify_port_event = notify_port_event;
170 sas_ha->notify_phy_event = sas_notify_phy_event;