drivers/scsi/libsas/sas_event.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Serial Attached SCSI (SAS) Event processing
   4  *
   5  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7  */
   8
   9 #include <linux/export.h>
  10 #include <scsi/scsi_host.h>
  11 #include "sas_internal.h"
  12
  13 int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
  14 {
  15         /* it's added to the defer_q when draining so return succeed */
  16         int rc = 1;
  17
  18         if (!test_bit(SAS_HA_REGISTERED, &ha->state))
  19                 return 0;
  20
  21         if (test_bit(SAS_HA_DRAINING, &ha->state)) {
  22                 /* add it to the defer list, if not already pending */
  23                 if (list_empty(&sw->drain_node))
  24                         list_add_tail(&sw->drain_node, &ha->defer_q);
  25         } else
  26                 rc = queue_work(ha->event_q, &sw->work);
  27
  28         return rc;
  29 }
  30
  31 static int sas_queue_event(int event, struct sas_work *work,
  32                             struct sas_ha_struct *ha)
  33 {
  34         unsigned long flags;
  35         int rc;
  36
  37         spin_lock_irqsave(&ha->lock, flags);
  38         rc = sas_queue_work(ha, work);
  39         spin_unlock_irqrestore(&ha->lock, flags);
  40
  41         return rc;
  42 }
  43
  44
  45 void __sas_drain_work(struct sas_ha_struct *ha)
  46 {
  47         struct sas_work *sw, *_sw;
  48         int ret;
  49
  50         set_bit(SAS_HA_DRAINING, &ha->state);
  51         /* flush submitters */
  52         spin_lock_irq(&ha->lock);
  53         spin_unlock_irq(&ha->lock);
  54
  55         drain_workqueue(ha->event_q);
  56         drain_workqueue(ha->disco_q);
  57
  58         spin_lock_irq(&ha->lock);
  59         clear_bit(SAS_HA_DRAINING, &ha->state);
  60         list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
  61                 list_del_init(&sw->drain_node);
  62                 ret = sas_queue_work(ha, sw);
  63                 if (ret != 1)
  64                         sas_free_event(to_asd_sas_event(&sw->work));
  65
  66         }
  67         spin_unlock_irq(&ha->lock);
  68 }
  69
  70 int sas_drain_work(struct sas_ha_struct *ha)
  71 {
  72         int err;
  73
  74         err = mutex_lock_interruptible(&ha->drain_mutex);
  75         if (err)
  76                 return err;
  77         if (test_bit(SAS_HA_REGISTERED, &ha->state))
  78                 __sas_drain_work(ha);
  79         mutex_unlock(&ha->drain_mutex);
  80
  81         return 0;
  82 }
  83 EXPORT_SYMBOL_GPL(sas_drain_work);
  84
  85 void sas_disable_revalidation(struct sas_ha_struct *ha)
  86 {
  87         mutex_lock(&ha->disco_mutex);
  88         set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
  89         mutex_unlock(&ha->disco_mutex);
  90 }
  91
  92 void sas_enable_revalidation(struct sas_ha_struct *ha)
  93 {
  94         int i;
  95
  96         mutex_lock(&ha->disco_mutex);
  97         clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
  98         for (i = 0; i < ha->num_phys; i++) {
  99                 struct asd_sas_port *port = ha->sas_port[i];
 100                 const int ev = DISCE_REVALIDATE_DOMAIN;
 101                 struct sas_discovery *d = &port->disc;
 102                 struct asd_sas_phy *sas_phy;
 103
 104                 if (!test_and_clear_bit(ev, &d->pending))
 105                         continue;
 106
 107                 if (list_empty(&port->phy_list))
 108                         continue;
 109
 110                 sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
 111                                 port_phy_el);
 112                 ha->notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
 113         }
 114         mutex_unlock(&ha->disco_mutex);
 115 }
 116
 117
 118 static void sas_port_event_worker(struct work_struct *work)
 119 {
 120         struct asd_sas_event *ev = to_asd_sas_event(work);
 121
 122         sas_port_event_fns[ev->event](work);
 123         sas_free_event(ev);
 124 }
 125
 126 static void sas_phy_event_worker(struct work_struct *work)
 127 {
 128         struct asd_sas_event *ev = to_asd_sas_event(work);
 129
 130         sas_phy_event_fns[ev->event](work);
 131         sas_free_event(ev);
 132 }
 133
 134 static int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
 135 {
 136         struct asd_sas_event *ev;
 137         struct sas_ha_struct *ha = phy->ha;
 138         int ret;
 139
 140         BUG_ON(event >= PORT_NUM_EVENTS);
 141
 142         ev = sas_alloc_event(phy);
 143         if (!ev)
 144                 return -ENOMEM;
 145
 146         INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
 147
 148         ret = sas_queue_event(event, &ev->work, ha);
 149         if (ret != 1)
 150                 sas_free_event(ev);
 151
 152         return ret;
 153 }
 154
 155 int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
 156 {
 157         struct asd_sas_event *ev;
 158         struct sas_ha_struct *ha = phy->ha;
 159         int ret;
 160
 161         BUG_ON(event >= PHY_NUM_EVENTS);
 162
 163         ev = sas_alloc_event(phy);
 164         if (!ev)
 165                 return -ENOMEM;
 166
 167         INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
 168
 169         ret = sas_queue_event(event, &ev->work, ha);
 170         if (ret != 1)
 171                 sas_free_event(ev);
 172
 173         return ret;
 174 }
 175
 176 int sas_init_events(struct sas_ha_struct *sas_ha)
 177 {
 178         sas_ha->notify_port_event = sas_notify_port_event;
 179         sas_ha->notify_phy_event = sas_notify_phy_event;
 180
 181         return 0;
 182 }