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
sas_queue_work(struct sas_ha_struct * ha,struct sas_work * sw)13 int 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
sas_queue_event(int event,struct sas_work * work,struct sas_ha_struct * ha)31 static 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
__sas_drain_work(struct sas_ha_struct * ha)45 void __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
sas_drain_work(struct sas_ha_struct * ha)70 int 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 }
83 EXPORT_SYMBOL_GPL(sas_drain_work);
84
sas_disable_revalidation(struct sas_ha_struct * ha)85 void 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
sas_enable_revalidation(struct sas_ha_struct * ha)92 void 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
sas_port_event_worker(struct work_struct * work)119 static 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
sas_phy_event_worker(struct work_struct * work)127 static 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
sas_notify_port_event(struct asd_sas_phy * phy,enum port_event event,gfp_t gfp_flags)135 int 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 }
156 EXPORT_SYMBOL_GPL(sas_notify_port_event);
157
sas_notify_phy_event(struct asd_sas_phy * phy,enum phy_event event,gfp_t gfp_flags)158 int 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 }
179 EXPORT_SYMBOL_GPL(sas_notify_phy_event);
180