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         aic_lock(aic);
 105         tsleep_interlock(aic->platform_data, 0);
 106         aic_unlock(aic);
 107         tsleep(aic->platform_data, PINTERLOCKED, "thtrm", 0);
 108 }
 109
 110 static void
 111 aic_recovery_thread(void *arg)
 112 {
 113         struct aic_softc *aic;
 114
 115         get_mplock();
 116
 117         aic = (struct aic_softc *)arg;
 118         aic_lock(aic);
 119
 120         for (;;) {
 121
 122                 if (LIST_EMPTY(&aic->timedout_scbs) != 0
 123                  && (aic->flags & AIC_SHUTDOWN_RECOVERY) == 0) {
 124                         tsleep_interlock(aic, 0);
 125                         aic_unlock(aic);
 126                         tsleep(aic, PINTERLOCKED, "idle", 0);
 127                         aic_lock(aic);
 128                 }
 129
 130                 if ((aic->flags & AIC_SHUTDOWN_RECOVERY) != 0)
 131                         break;
 132
 133                 aic_recover_commands(aic);
 134         }
 135         aic->platform_data->recovery_thread = NULL;
 136         wakeup(aic->platform_data);
 137         aic_unlock(aic);
 138
 139         rel_mplock();
 140 }