v4.19.13 snapshot.
diff --git a/drivers/scsi/libsas/sas_event.c b/drivers/scsi/libsas/sas_event.c
new file mode 100644
index 0000000..ae923eb
--- /dev/null
+++ b/drivers/scsi/libsas/sas_event.c
@@ -0,0 +1,199 @@
+/*
+ * Serial Attached SCSI (SAS) Event processing
+ *
+ * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ *
+ * This file is licensed under GPLv2.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include <linux/export.h>
+#include <scsi/scsi_host.h>
+#include "sas_internal.h"
+#include "sas_dump.h"
+
+int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
+{
+ /* it's added to the defer_q when draining so return succeed */
+ int rc = 1;
+
+ if (!test_bit(SAS_HA_REGISTERED, &ha->state))
+ return 0;
+
+ if (test_bit(SAS_HA_DRAINING, &ha->state)) {
+ /* add it to the defer list, if not already pending */
+ if (list_empty(&sw->drain_node))
+ list_add_tail(&sw->drain_node, &ha->defer_q);
+ } else
+ rc = queue_work(ha->event_q, &sw->work);
+
+ return rc;
+}
+
+static int sas_queue_event(int event, struct sas_work *work,
+ struct sas_ha_struct *ha)
+{
+ unsigned long flags;
+ int rc;
+
+ spin_lock_irqsave(&ha->lock, flags);
+ rc = sas_queue_work(ha, work);
+ spin_unlock_irqrestore(&ha->lock, flags);
+
+ return rc;
+}
+
+
+void __sas_drain_work(struct sas_ha_struct *ha)
+{
+ struct sas_work *sw, *_sw;
+ int ret;
+
+ set_bit(SAS_HA_DRAINING, &ha->state);
+ /* flush submitters */
+ spin_lock_irq(&ha->lock);
+ spin_unlock_irq(&ha->lock);
+
+ drain_workqueue(ha->event_q);
+ drain_workqueue(ha->disco_q);
+
+ spin_lock_irq(&ha->lock);
+ clear_bit(SAS_HA_DRAINING, &ha->state);
+ list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
+ list_del_init(&sw->drain_node);
+ ret = sas_queue_work(ha, sw);
+ if (ret != 1)
+ sas_free_event(to_asd_sas_event(&sw->work));
+
+ }
+ spin_unlock_irq(&ha->lock);
+}
+
+int sas_drain_work(struct sas_ha_struct *ha)
+{
+ int err;
+
+ err = mutex_lock_interruptible(&ha->drain_mutex);
+ if (err)
+ return err;
+ if (test_bit(SAS_HA_REGISTERED, &ha->state))
+ __sas_drain_work(ha);
+ mutex_unlock(&ha->drain_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sas_drain_work);
+
+void sas_disable_revalidation(struct sas_ha_struct *ha)
+{
+ mutex_lock(&ha->disco_mutex);
+ set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
+ mutex_unlock(&ha->disco_mutex);
+}
+
+void sas_enable_revalidation(struct sas_ha_struct *ha)
+{
+ int i;
+
+ mutex_lock(&ha->disco_mutex);
+ clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
+ for (i = 0; i < ha->num_phys; i++) {
+ struct asd_sas_port *port = ha->sas_port[i];
+ const int ev = DISCE_REVALIDATE_DOMAIN;
+ struct sas_discovery *d = &port->disc;
+ struct asd_sas_phy *sas_phy;
+
+ if (!test_and_clear_bit(ev, &d->pending))
+ continue;
+
+ if (list_empty(&port->phy_list))
+ continue;
+
+ sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
+ port_phy_el);
+ ha->notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
+ }
+ mutex_unlock(&ha->disco_mutex);
+}
+
+
+static void sas_port_event_worker(struct work_struct *work)
+{
+ struct asd_sas_event *ev = to_asd_sas_event(work);
+
+ sas_port_event_fns[ev->event](work);
+ sas_free_event(ev);
+}
+
+static void sas_phy_event_worker(struct work_struct *work)
+{
+ struct asd_sas_event *ev = to_asd_sas_event(work);
+
+ sas_phy_event_fns[ev->event](work);
+ sas_free_event(ev);
+}
+
+static int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
+{
+ struct asd_sas_event *ev;
+ struct sas_ha_struct *ha = phy->ha;
+ int ret;
+
+ BUG_ON(event >= PORT_NUM_EVENTS);
+
+ ev = sas_alloc_event(phy);
+ if (!ev)
+ return -ENOMEM;
+
+ INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
+
+ ret = sas_queue_event(event, &ev->work, ha);
+ if (ret != 1)
+ sas_free_event(ev);
+
+ return ret;
+}
+
+int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
+{
+ struct asd_sas_event *ev;
+ struct sas_ha_struct *ha = phy->ha;
+ int ret;
+
+ BUG_ON(event >= PHY_NUM_EVENTS);
+
+ ev = sas_alloc_event(phy);
+ if (!ev)
+ return -ENOMEM;
+
+ INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
+
+ ret = sas_queue_event(event, &ev->work, ha);
+ if (ret != 1)
+ sas_free_event(ev);
+
+ return ret;
+}
+
+int sas_init_events(struct sas_ha_struct *sas_ha)
+{
+ sas_ha->notify_port_event = sas_notify_port_event;
+ sas_ha->notify_phy_event = sas_notify_phy_event;
+
+ return 0;
+}