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2908d778 JB |
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 | ||
b1124cd3 | 25 | #include <linux/export.h> |
2908d778 JB |
26 | #include <scsi/scsi_host.h> |
27 | #include "sas_internal.h" | |
28 | #include "sas_dump.h" | |
29 | ||
b1124cd3 DW |
30 | static void sas_queue_work(struct sas_ha_struct *ha, struct work_struct *work) |
31 | { | |
32 | if (!test_bit(SAS_HA_REGISTERED, &ha->state)) | |
33 | return; | |
34 | ||
35 | if (test_bit(SAS_HA_DRAINING, &ha->state)) | |
36 | list_add(&work->entry, &ha->defer_q); | |
37 | else | |
38 | scsi_queue_work(ha->core.shost, work); | |
39 | } | |
40 | ||
41 | static void sas_queue_event(int event, unsigned long *pending, | |
42 | struct work_struct *work, | |
43 | struct sas_ha_struct *ha) | |
44 | { | |
45 | if (!test_and_set_bit(event, pending)) { | |
46 | unsigned long flags; | |
47 | ||
48 | spin_lock_irqsave(&ha->state_lock, flags); | |
49 | sas_queue_work(ha, work); | |
50 | spin_unlock_irqrestore(&ha->state_lock, flags); | |
51 | } | |
52 | } | |
53 | ||
54 | int sas_drain_work(struct sas_ha_struct *ha) | |
55 | { | |
56 | struct workqueue_struct *wq = ha->core.shost->work_q; | |
57 | struct work_struct *w, *_w; | |
58 | int err; | |
59 | ||
60 | err = mutex_lock_interruptible(&ha->drain_mutex); | |
61 | if (err) | |
62 | return err; | |
63 | ||
64 | set_bit(SAS_HA_DRAINING, &ha->state); | |
65 | /* flush submitters */ | |
66 | spin_lock_irq(&ha->state_lock); | |
67 | spin_unlock_irq(&ha->state_lock); | |
68 | ||
69 | drain_workqueue(wq); | |
70 | ||
71 | spin_lock_irq(&ha->state_lock); | |
72 | clear_bit(SAS_HA_DRAINING, &ha->state); | |
73 | list_for_each_entry_safe(w, _w, &ha->defer_q, entry) { | |
74 | list_del_init(&w->entry); | |
75 | sas_queue_work(ha, w); | |
76 | } | |
77 | spin_unlock_irq(&ha->state_lock); | |
78 | mutex_unlock(&ha->drain_mutex); | |
79 | ||
80 | return 0; | |
81 | } | |
82 | EXPORT_SYMBOL_GPL(sas_drain_work); | |
83 | ||
2908d778 JB |
84 | static void notify_ha_event(struct sas_ha_struct *sas_ha, enum ha_event event) |
85 | { | |
86 | BUG_ON(event >= HA_NUM_EVENTS); | |
87 | ||
b15ebe0b | 88 | sas_queue_event(event, &sas_ha->pending, |
6b0efb85 | 89 | &sas_ha->ha_events[event].work, sas_ha); |
2908d778 JB |
90 | } |
91 | ||
92 | static void notify_port_event(struct asd_sas_phy *phy, enum port_event event) | |
93 | { | |
94 | struct sas_ha_struct *ha = phy->ha; | |
95 | ||
96 | BUG_ON(event >= PORT_NUM_EVENTS); | |
97 | ||
b15ebe0b | 98 | sas_queue_event(event, &phy->port_events_pending, |
6b0efb85 | 99 | &phy->port_events[event].work, ha); |
2908d778 JB |
100 | } |
101 | ||
102 | static void notify_phy_event(struct asd_sas_phy *phy, enum phy_event event) | |
103 | { | |
104 | struct sas_ha_struct *ha = phy->ha; | |
105 | ||
106 | BUG_ON(event >= PHY_NUM_EVENTS); | |
107 | ||
b15ebe0b | 108 | sas_queue_event(event, &phy->phy_events_pending, |
6b0efb85 | 109 | &phy->phy_events[event].work, ha); |
2908d778 JB |
110 | } |
111 | ||
112 | int sas_init_events(struct sas_ha_struct *sas_ha) | |
113 | { | |
c4028958 | 114 | static const work_func_t sas_ha_event_fns[HA_NUM_EVENTS] = { |
2908d778 JB |
115 | [HAE_RESET] = sas_hae_reset, |
116 | }; | |
117 | ||
118 | int i; | |
119 | ||
c4028958 DH |
120 | for (i = 0; i < HA_NUM_EVENTS; i++) { |
121 | INIT_WORK(&sas_ha->ha_events[i].work, sas_ha_event_fns[i]); | |
122 | sas_ha->ha_events[i].ha = sas_ha; | |
123 | } | |
2908d778 JB |
124 | |
125 | sas_ha->notify_ha_event = notify_ha_event; | |
126 | sas_ha->notify_port_event = notify_port_event; | |
127 | sas_ha->notify_phy_event = notify_phy_event; | |
128 | ||
129 | return 0; | |
130 | } |