MPSAFE locking for the ahc/ahd drivers using lockmgr locks.
[dragonfly.git] / sys / dev / disk / aic7xxx / aic_osm_lib.c
1 /*
2  * FreeBSD OSM Library for the aic7xxx aic79xx based Adaptec SCSI controllers
3  *
4  * Copyright (c) 1994-2002 Justin T. Gibbs.
5  * Copyright (c) 2001-2003 Adaptec Inc.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions, and the following disclaimer,
13  *    without modification.
14  * 2. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission.
16  *
17  * Alternatively, this software may be distributed under the terms of the
18  * GNU Public License ("GPL").
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
24  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * $Id: //depot/aic7xxx/freebsd/dev/aic7xxx/aic_osm_lib.c#5 $
33  *
34  * $FreeBSD: src/sys/dev/aic7xxx/aic_osm_lib.c,v 1.3 2004/08/17 00:14:31 gibbs Exp $
35  * $DragonFly: src/sys/dev/disk/aic7xxx/aic_osm_lib.c,v 1.3 2008/02/09 18:13:13 pavalos Exp $
36  */
37
38 static void     aic_recovery_thread(void *arg);
39
40 void
41 aic_set_recoveryscb(struct aic_softc *aic, struct scb *scb)
42 {
43
44         if ((scb->flags & SCB_RECOVERY_SCB) == 0) {
45                 struct scb *list_scb;
46
47                 scb->flags |= SCB_RECOVERY_SCB;
48
49                 AIC_SCB_DATA(aic)->recovery_scbs++;
50
51                 /*
52                  * Go through all of our pending SCBs and remove
53                  * any scheduled timeouts for them.  We will reschedule
54                  * them after we've successfully fixed this problem.
55                  */
56                 LIST_FOREACH(list_scb, &aic->pending_scbs, pending_links) {
57                         union ccb *ccb;
58
59                         ccb = list_scb->io_ctx;
60                         callout_stop(&scb->io_timer);
61                 }
62         }
63 }
64
65 void
66 aic_platform_timeout(void *arg)
67 {
68         struct  scb *scb;
69         
70         scb = (struct scb *)arg; 
71         aic_lock(scb->aic_softc);
72         aic_timeout(scb);
73         aic_unlock(scb->aic_softc);
74 }
75
76 int
77 aic_spawn_recovery_thread(struct aic_softc *aic)
78 {
79         int error;
80
81         error = aic_kthread_create(aic_recovery_thread, aic,
82                                &aic->platform_data->recovery_thread,
83                                /*flags*/0, /*altstack*/0, "aic_recovery%d",
84                                aic->unit);
85         return (error);
86 }
87
88 /*
89  * Lock is not held on entry.
90  */
91 void
92 aic_terminate_recovery_thread(struct aic_softc *aic)
93 {
94
95         if (aic->platform_data->recovery_thread == NULL) {
96                 return;
97         }
98         aic->flags |= AIC_SHUTDOWN_RECOVERY;
99         wakeup(aic);
100         /*
101          * Sleep on a slightly different location 
102          * for this interlock just for added safety.
103          */
104         crit_enter();
105         aic_lock(aic);
106         tsleep_interlock(aic->platform_data);
107         aic_unlock(aic);
108         tsleep(aic->platform_data, 0, "thtrm", 0);
109         crit_exit();
110 }
111
112 static void
113 aic_recovery_thread(void *arg)
114 {
115         struct aic_softc *aic;
116
117         aic = (struct aic_softc *)arg;
118         aic_lock(aic);
119         for (;;) {
120                 
121                 if (LIST_EMPTY(&aic->timedout_scbs) != 0
122                  && (aic->flags & AIC_SHUTDOWN_RECOVERY) == 0) {
123                         crit_enter();
124                         tsleep_interlock(aic);
125                         aic_unlock(aic);
126                         tsleep(aic, 0, "idle", 0);
127                         aic_lock(aic);
128                         crit_exit();
129                 }
130
131                 if ((aic->flags & AIC_SHUTDOWN_RECOVERY) != 0)
132                         break;
133
134                 aic_recover_commands(aic);
135         }
136         aic->platform_data->recovery_thread = NULL;
137         wakeup(aic->platform_data);
138         aic_unlock(aic);
139         kthread_exit();
140 }