drivers/scsi/libsas/sas_event.c

   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
  29 int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
  30 {
  31         /* it's added to the defer_q when draining so return succeed */
  32         int rc = 1;
  33
  34         if (!test_bit(SAS_HA_REGISTERED, &ha->state))
  35                 return 0;
  36
  37         if (test_bit(SAS_HA_DRAINING, &ha->state)) {
  38                 /* add it to the defer list, if not already pending */
  39                 if (list_empty(&sw->drain_node))
  40                         list_add_tail(&sw->drain_node, &ha->defer_q);
  41         } else
  42                 rc = queue_work(ha->event_q, &sw->work);
  43
  44         return rc;
  45 }
  46
  47 static int sas_queue_event(int event, struct sas_work *work,
  48                             struct sas_ha_struct *ha)
  49 {
  50         unsigned long flags;
  51         int rc;
  52
  53         spin_lock_irqsave(&ha->lock, flags);
  54         rc = sas_queue_work(ha, work);
  55         spin_unlock_irqrestore(&ha->lock, flags);
  56
  57         return rc;
  58 }
  59
  60
  61 void __sas_drain_work(struct sas_ha_struct *ha)
  62 {
  63         struct sas_work *sw, *_sw;
  64         int ret;
  65
  66         set_bit(SAS_HA_DRAINING, &ha->state);
  67         /* flush submitters */
  68         spin_lock_irq(&ha->lock);
  69         spin_unlock_irq(&ha->lock);
  70
  71         drain_workqueue(ha->event_q);
  72         drain_workqueue(ha->disco_q);
  73
  74         spin_lock_irq(&ha->lock);
  75         clear_bit(SAS_HA_DRAINING, &ha->state);
  76         list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
  77                 list_del_init(&sw->drain_node);
  78                 ret = sas_queue_work(ha, sw);
  79                 if (ret != 1)
  80                         sas_free_event(to_asd_sas_event(&sw->work));
  81
  82         }
  83         spin_unlock_irq(&ha->lock);
  84 }
  85
  86 int sas_drain_work(struct sas_ha_struct *ha)
  87 {
  88         int err;
  89
  90         err = mutex_lock_interruptible(&ha->drain_mutex);
  91         if (err)
  92                 return err;
  93         if (test_bit(SAS_HA_REGISTERED, &ha->state))
  94                 __sas_drain_work(ha);
  95         mutex_unlock(&ha->drain_mutex);
  96
  97         return 0;
  98 }
  99 EXPORT_SYMBOL_GPL(sas_drain_work);
 100
 101 void sas_disable_revalidation(struct sas_ha_struct *ha)
 102 {
 103         mutex_lock(&ha->disco_mutex);
 104         set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
 105         mutex_unlock(&ha->disco_mutex);
 106 }
 107
 108 void sas_enable_revalidation(struct sas_ha_struct *ha)
 109 {
 110         int i;
 111
 112         mutex_lock(&ha->disco_mutex);
 113         clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
 114         for (i = 0; i < ha->num_phys; i++) {
 115                 struct asd_sas_port *port = ha->sas_port[i];
 116                 const int ev = DISCE_REVALIDATE_DOMAIN;
 117                 struct sas_discovery *d = &port->disc;
 118                 struct asd_sas_phy *sas_phy;
 119
 120                 if (!test_and_clear_bit(ev, &d->pending))
 121                         continue;
 122
 123                 if (list_empty(&port->phy_list))
 124                         continue;
 125
 126                 sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
 127                                 port_phy_el);
 128                 ha->notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
 129         }
 130         mutex_unlock(&ha->disco_mutex);
 131 }
 132
 133
 134 static void sas_port_event_worker(struct work_struct *work)
 135 {
 136         struct asd_sas_event *ev = to_asd_sas_event(work);
 137
 138         sas_port_event_fns[ev->event](work);
 139         sas_free_event(ev);
 140 }
 141
 142 static void sas_phy_event_worker(struct work_struct *work)
 143 {
 144         struct asd_sas_event *ev = to_asd_sas_event(work);
 145
 146         sas_phy_event_fns[ev->event](work);
 147         sas_free_event(ev);
 148 }
 149
 150 static int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
 151 {
 152         struct asd_sas_event *ev;
 153         struct sas_ha_struct *ha = phy->ha;
 154         int ret;
 155
 156         BUG_ON(event >= PORT_NUM_EVENTS);
 157
 158         ev = sas_alloc_event(phy);
 159         if (!ev)
 160                 return -ENOMEM;
 161
 162         INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
 163
 164         ret = sas_queue_event(event, &ev->work, ha);
 165         if (ret != 1)
 166                 sas_free_event(ev);
 167
 168         return ret;
 169 }
 170
 171 int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
 172 {
 173         struct asd_sas_event *ev;
 174         struct sas_ha_struct *ha = phy->ha;
 175         int ret;
 176
 177         BUG_ON(event >= PHY_NUM_EVENTS);
 178
 179         ev = sas_alloc_event(phy);
 180         if (!ev)
 181                 return -ENOMEM;
 182
 183         INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
 184
 185         ret = sas_queue_event(event, &ev->work, ha);
 186         if (ret != 1)
 187                 sas_free_event(ev);
 188
 189         return ret;
 190 }
 191
 192 int sas_init_events(struct sas_ha_struct *sas_ha)
 193 {
 194         sas_ha->notify_port_event = sas_notify_port_event;
 195         sas_ha->notify_phy_event = sas_notify_phy_event;
 196
 197         return 0;
 198 }