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 #include "sas_dump.h"
  29
  30 int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
  31 {
  32         /* it's added to the defer_q when draining so return succeed */
  33         int rc = 1;
  34
  35         if (!test_bit(SAS_HA_REGISTERED, &ha->state))
  36                 return 0;
  37
  38         if (test_bit(SAS_HA_DRAINING, &ha->state)) {
  39                 /* add it to the defer list, if not already pending */
  40                 if (list_empty(&sw->drain_node))
  41                         list_add_tail(&sw->drain_node, &ha->defer_q);
  42         } else
  43                 rc = queue_work(ha->event_q, &sw->work);
  44
  45         return rc;
  46 }
  47
  48 static int sas_queue_event(int event, struct sas_work *work,
  49                             struct sas_ha_struct *ha)
  50 {
  51         unsigned long flags;
  52         int rc;
  53
  54         spin_lock_irqsave(&ha->lock, flags);
  55         rc = sas_queue_work(ha, work);
  56         spin_unlock_irqrestore(&ha->lock, flags);
  57
  58         return rc;
  59 }
  60
  61
  62 void __sas_drain_work(struct sas_ha_struct *ha)
  63 {
  64         struct sas_work *sw, *_sw;
  65         int ret;
  66
  67         set_bit(SAS_HA_DRAINING, &ha->state);
  68         /* flush submitters */
  69         spin_lock_irq(&ha->lock);
  70         spin_unlock_irq(&ha->lock);
  71
  72         drain_workqueue(ha->event_q);
  73         drain_workqueue(ha->disco_q);
  74
  75         spin_lock_irq(&ha->lock);
  76         clear_bit(SAS_HA_DRAINING, &ha->state);
  77         list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
  78                 list_del_init(&sw->drain_node);
  79                 ret = sas_queue_work(ha, sw);
  80                 if (ret != 1)
  81                         sas_free_event(to_asd_sas_event(&sw->work));
  82
  83         }
  84         spin_unlock_irq(&ha->lock);
  85 }
  86
  87 int sas_drain_work(struct sas_ha_struct *ha)
  88 {
  89         int err;
  90
  91         err = mutex_lock_interruptible(&ha->drain_mutex);
  92         if (err)
  93                 return err;
  94         if (test_bit(SAS_HA_REGISTERED, &ha->state))
  95                 __sas_drain_work(ha);
  96         mutex_unlock(&ha->drain_mutex);
  97
  98         return 0;
  99 }
 100 EXPORT_SYMBOL_GPL(sas_drain_work);
 101
 102 void sas_disable_revalidation(struct sas_ha_struct *ha)
 103 {
 104         mutex_lock(&ha->disco_mutex);
 105         set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
 106         mutex_unlock(&ha->disco_mutex);
 107 }
 108
 109 void sas_enable_revalidation(struct sas_ha_struct *ha)
 110 {
 111         int i;
 112
 113         mutex_lock(&ha->disco_mutex);
 114         clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
 115         for (i = 0; i < ha->num_phys; i++) {
 116                 struct asd_sas_port *port = ha->sas_port[i];
 117                 const int ev = DISCE_REVALIDATE_DOMAIN;
 118                 struct sas_discovery *d = &port->disc;
 119                 struct asd_sas_phy *sas_phy;
 120
 121                 if (!test_and_clear_bit(ev, &d->pending))
 122                         continue;
 123
 124                 if (list_empty(&port->phy_list))
 125                         continue;
 126
 127                 sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
 128                                 port_phy_el);
 129                 ha->notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
 130         }
 131         mutex_unlock(&ha->disco_mutex);
 132 }
 133
 134
 135 static void sas_port_event_worker(struct work_struct *work)
 136 {
 137         struct asd_sas_event *ev = to_asd_sas_event(work);
 138
 139         sas_port_event_fns[ev->event](work);
 140         sas_free_event(ev);
 141 }
 142
 143 static void sas_phy_event_worker(struct work_struct *work)
 144 {
 145         struct asd_sas_event *ev = to_asd_sas_event(work);
 146
 147         sas_phy_event_fns[ev->event](work);
 148         sas_free_event(ev);
 149 }
 150
 151 static int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
 152 {
 153         struct asd_sas_event *ev;
 154         struct sas_ha_struct *ha = phy->ha;
 155         int ret;
 156
 157         BUG_ON(event >= PORT_NUM_EVENTS);
 158
 159         ev = sas_alloc_event(phy);
 160         if (!ev)
 161                 return -ENOMEM;
 162
 163         INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
 164
 165         ret = sas_queue_event(event, &ev->work, ha);
 166         if (ret != 1)
 167                 sas_free_event(ev);
 168
 169         return ret;
 170 }
 171
 172 int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
 173 {
 174         struct asd_sas_event *ev;
 175         struct sas_ha_struct *ha = phy->ha;
 176         int ret;
 177
 178         BUG_ON(event >= PHY_NUM_EVENTS);
 179
 180         ev = sas_alloc_event(phy);
 181         if (!ev)
 182                 return -ENOMEM;
 183
 184         INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
 185
 186         ret = sas_queue_event(event, &ev->work, ha);
 187         if (ret != 1)
 188                 sas_free_event(ev);
 189
 190         return ret;
 191 }
 192
 193 int sas_init_events(struct sas_ha_struct *sas_ha)
 194 {
 195         sas_ha->notify_port_event = sas_notify_port_event;
 196         sas_ha->notify_phy_event = sas_notify_phy_event;
 197
 198         return 0;
 199 }