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1/*
2 * Serial Attached SCSI (SAS) Event processing
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 <linux/export.h>
26#include <scsi/scsi_host.h>
27#include "sas_internal.h"
28#include "sas_dump.h"
29
30void sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
31{
32 if (!test_bit(SAS_HA_REGISTERED, &ha->state))
33 return;
34
35 if (test_bit(SAS_HA_DRAINING, &ha->state)) {
36 /* add it to the defer list, if not already pending */
37 if (list_empty(&sw->drain_node))
38 list_add(&sw->drain_node, &ha->defer_q);
39 } else
40 scsi_queue_work(ha->core.shost, &sw->work);
41}
42
43static void sas_queue_event(int event, unsigned long *pending,
44 struct sas_work *work,
45 struct sas_ha_struct *ha)
46{
47 if (!test_and_set_bit(event, pending)) {
48 unsigned long flags;
49
50 spin_lock_irqsave(&ha->lock, flags);
51 sas_queue_work(ha, work);
52 spin_unlock_irqrestore(&ha->lock, flags);
53 }
54}
55
56
57void __sas_drain_work(struct sas_ha_struct *ha)
58{
59 struct workqueue_struct *wq = ha->core.shost->work_q;
60 struct sas_work *sw, *_sw;
61
62 set_bit(SAS_HA_DRAINING, &ha->state);
63 /* flush submitters */
64 spin_lock_irq(&ha->lock);
65 spin_unlock_irq(&ha->lock);
66
67 drain_workqueue(wq);
68
69 spin_lock_irq(&ha->lock);
70 clear_bit(SAS_HA_DRAINING, &ha->state);
71 list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
72 list_del_init(&sw->drain_node);
73 sas_queue_work(ha, sw);
74 }
75 spin_unlock_irq(&ha->lock);
76}
77
78int sas_drain_work(struct sas_ha_struct *ha)
79{
80 int err;
81
82 err = mutex_lock_interruptible(&ha->drain_mutex);
83 if (err)
84 return err;
85 if (test_bit(SAS_HA_REGISTERED, &ha->state))
86 __sas_drain_work(ha);
87 mutex_unlock(&ha->drain_mutex);
88
89 return 0;
90}
91EXPORT_SYMBOL_GPL(sas_drain_work);
92
93void sas_disable_revalidation(struct sas_ha_struct *ha)
94{
95 mutex_lock(&ha->disco_mutex);
96 set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
97 mutex_unlock(&ha->disco_mutex);
98}
99
100void sas_enable_revalidation(struct sas_ha_struct *ha)
101{
102 int i;
103
104 mutex_lock(&ha->disco_mutex);
105 clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
106 for (i = 0; i < ha->num_phys; i++) {
107 struct asd_sas_port *port = ha->sas_port[i];
108 const int ev = DISCE_REVALIDATE_DOMAIN;
109 struct sas_discovery *d = &port->disc;
110
111 if (!test_and_clear_bit(ev, &d->pending))
112 continue;
113
114 sas_queue_event(ev, &d->pending, &d->disc_work[ev].work, ha);
115 }
116 mutex_unlock(&ha->disco_mutex);
117}
118
119static void notify_ha_event(struct sas_ha_struct *sas_ha, enum ha_event event)
120{
121 BUG_ON(event >= HA_NUM_EVENTS);
122
123 sas_queue_event(event, &sas_ha->pending,
124 &sas_ha->ha_events[event].work, sas_ha);
125}
126
127static void notify_port_event(struct asd_sas_phy *phy, enum port_event event)
128{
129 struct sas_ha_struct *ha = phy->ha;
130
131 BUG_ON(event >= PORT_NUM_EVENTS);
132
133 sas_queue_event(event, &phy->port_events_pending,
134 &phy->port_events[event].work, ha);
135}
136
137void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
138{
139 struct sas_ha_struct *ha = phy->ha;
140
141 BUG_ON(event >= PHY_NUM_EVENTS);
142
143 sas_queue_event(event, &phy->phy_events_pending,
144 &phy->phy_events[event].work, ha);
145}
146
147int sas_init_events(struct sas_ha_struct *sas_ha)
148{
149 static const work_func_t sas_ha_event_fns[HA_NUM_EVENTS] = {
150 [HAE_RESET] = sas_hae_reset,
151 };
152
153 int i;
154
155 for (i = 0; i < HA_NUM_EVENTS; i++) {
156 INIT_SAS_WORK(&sas_ha->ha_events[i].work, sas_ha_event_fns[i]);
157 sas_ha->ha_events[i].ha = sas_ha;
158 }
159
160 sas_ha->notify_ha_event = notify_ha_event;
161 sas_ha->notify_port_event = notify_port_event;
162 sas_ha->notify_phy_event = sas_notify_phy_event;
163
164 return 0;
165}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Serial Attached SCSI (SAS) Event processing
4 *
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 */
8
9#include <linux/export.h>
10#include <scsi/scsi_host.h>
11#include "sas_internal.h"
12
13int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
14{
15 /* it's added to the defer_q when draining so return succeed */
16 int rc = 1;
17
18 if (!test_bit(SAS_HA_REGISTERED, &ha->state))
19 return 0;
20
21 if (test_bit(SAS_HA_DRAINING, &ha->state)) {
22 /* add it to the defer list, if not already pending */
23 if (list_empty(&sw->drain_node))
24 list_add_tail(&sw->drain_node, &ha->defer_q);
25 } else
26 rc = queue_work(ha->event_q, &sw->work);
27
28 return rc;
29}
30
31static int sas_queue_event(int event, struct sas_work *work,
32 struct sas_ha_struct *ha)
33{
34 unsigned long flags;
35 int rc;
36
37 spin_lock_irqsave(&ha->lock, flags);
38 rc = sas_queue_work(ha, work);
39 spin_unlock_irqrestore(&ha->lock, flags);
40
41 return rc;
42}
43
44
45void __sas_drain_work(struct sas_ha_struct *ha)
46{
47 struct sas_work *sw, *_sw;
48 int ret;
49
50 set_bit(SAS_HA_DRAINING, &ha->state);
51 /* flush submitters */
52 spin_lock_irq(&ha->lock);
53 spin_unlock_irq(&ha->lock);
54
55 drain_workqueue(ha->event_q);
56 drain_workqueue(ha->disco_q);
57
58 spin_lock_irq(&ha->lock);
59 clear_bit(SAS_HA_DRAINING, &ha->state);
60 list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
61 list_del_init(&sw->drain_node);
62 ret = sas_queue_work(ha, sw);
63 if (ret != 1)
64 sas_free_event(to_asd_sas_event(&sw->work));
65
66 }
67 spin_unlock_irq(&ha->lock);
68}
69
70int sas_drain_work(struct sas_ha_struct *ha)
71{
72 int err;
73
74 err = mutex_lock_interruptible(&ha->drain_mutex);
75 if (err)
76 return err;
77 if (test_bit(SAS_HA_REGISTERED, &ha->state))
78 __sas_drain_work(ha);
79 mutex_unlock(&ha->drain_mutex);
80
81 return 0;
82}
83EXPORT_SYMBOL_GPL(sas_drain_work);
84
85void sas_disable_revalidation(struct sas_ha_struct *ha)
86{
87 mutex_lock(&ha->disco_mutex);
88 set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
89 mutex_unlock(&ha->disco_mutex);
90}
91
92void sas_enable_revalidation(struct sas_ha_struct *ha)
93{
94 int i;
95
96 mutex_lock(&ha->disco_mutex);
97 clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
98 for (i = 0; i < ha->num_phys; i++) {
99 struct asd_sas_port *port = ha->sas_port[i];
100 const int ev = DISCE_REVALIDATE_DOMAIN;
101 struct sas_discovery *d = &port->disc;
102 struct asd_sas_phy *sas_phy;
103
104 if (!test_and_clear_bit(ev, &d->pending))
105 continue;
106
107 if (list_empty(&port->phy_list))
108 continue;
109
110 sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
111 port_phy_el);
112 sas_notify_port_event(sas_phy,
113 PORTE_BROADCAST_RCVD, GFP_KERNEL);
114 }
115 mutex_unlock(&ha->disco_mutex);
116}
117
118
119static void sas_port_event_worker(struct work_struct *work)
120{
121 struct asd_sas_event *ev = to_asd_sas_event(work);
122
123 sas_port_event_fns[ev->event](work);
124 sas_free_event(ev);
125}
126
127static void sas_phy_event_worker(struct work_struct *work)
128{
129 struct asd_sas_event *ev = to_asd_sas_event(work);
130
131 sas_phy_event_fns[ev->event](work);
132 sas_free_event(ev);
133}
134
135int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
136 gfp_t gfp_flags)
137{
138 struct sas_ha_struct *ha = phy->ha;
139 struct asd_sas_event *ev;
140 int ret;
141
142 BUG_ON(event >= PORT_NUM_EVENTS);
143
144 ev = sas_alloc_event(phy, gfp_flags);
145 if (!ev)
146 return -ENOMEM;
147
148 INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
149
150 ret = sas_queue_event(event, &ev->work, ha);
151 if (ret != 1)
152 sas_free_event(ev);
153
154 return ret;
155}
156EXPORT_SYMBOL_GPL(sas_notify_port_event);
157
158int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event,
159 gfp_t gfp_flags)
160{
161 struct sas_ha_struct *ha = phy->ha;
162 struct asd_sas_event *ev;
163 int ret;
164
165 BUG_ON(event >= PHY_NUM_EVENTS);
166
167 ev = sas_alloc_event(phy, gfp_flags);
168 if (!ev)
169 return -ENOMEM;
170
171 INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
172
173 ret = sas_queue_event(event, &ev->work, ha);
174 if (ret != 1)
175 sas_free_event(ev);
176
177 return ret;
178}
179EXPORT_SYMBOL_GPL(sas_notify_phy_event);