Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/scsi/libsas/sas_event.c b/drivers/scsi/libsas/sas_event.c
new file mode 100644
index 000000000..f3a17191a
--- /dev/null
+++ b/drivers/scsi/libsas/sas_event.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Serial Attached SCSI (SAS) Event processing
+ *
+ * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ */
+
+#include <linux/export.h>
+#include <scsi/scsi_host.h>
+#include "sas_internal.h"
+
+bool sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
+{
+	if (!test_bit(SAS_HA_REGISTERED, &ha->state))
+		return false;
+
+	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);
+		return true;
+	}
+
+	return queue_work(ha->event_q, &sw->work);
+}
+
+static bool sas_queue_event(int event, struct sas_work *work,
+			    struct sas_ha_struct *ha)
+{
+	unsigned long flags;
+	bool rc;
+
+	spin_lock_irqsave(&ha->lock, flags);
+	rc = sas_queue_work(ha, work);
+	spin_unlock_irqrestore(&ha->lock, flags);
+
+	return rc;
+}
+
+void sas_queue_deferred_work(struct sas_ha_struct *ha)
+{
+	struct sas_work *sw, *_sw;
+
+	spin_lock_irq(&ha->lock);
+	list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
+		list_del_init(&sw->drain_node);
+
+		if (!sas_queue_work(ha, sw)) {
+			pm_runtime_put(ha->dev);
+			sas_free_event(to_asd_sas_event(&sw->work));
+		}
+	}
+	spin_unlock_irq(&ha->lock);
+}
+
+void __sas_drain_work(struct sas_ha_struct *ha)
+{
+	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);
+
+	clear_bit(SAS_HA_DRAINING, &ha->state);
+	sas_queue_deferred_work(ha);
+}
+
+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;
+
+		spin_lock(&port->phy_list_lock);
+		if (list_empty(&port->phy_list)) {
+			spin_unlock(&port->phy_list_lock);
+			continue;
+		}
+
+		sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
+				port_phy_el);
+		spin_unlock(&port->phy_list_lock);
+		sas_notify_port_event(sas_phy,
+				PORTE_BROADCAST_RCVD, GFP_KERNEL);
+	}
+	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);
+	struct asd_sas_phy *phy = ev->phy;
+	struct sas_ha_struct *ha = phy->ha;
+
+	sas_port_event_fns[ev->event](work);
+	pm_runtime_put(ha->dev);
+	sas_free_event(ev);
+}
+
+static void sas_phy_event_worker(struct work_struct *work)
+{
+	struct asd_sas_event *ev = to_asd_sas_event(work);
+	struct asd_sas_phy *phy = ev->phy;
+	struct sas_ha_struct *ha = phy->ha;
+
+	sas_phy_event_fns[ev->event](work);
+	pm_runtime_put(ha->dev);
+	sas_free_event(ev);
+}
+
+/* defer works of new phys during suspend */
+static bool sas_defer_event(struct asd_sas_phy *phy, struct asd_sas_event *ev)
+{
+	struct sas_ha_struct *ha = phy->ha;
+	unsigned long flags;
+	bool deferred = false;
+
+	spin_lock_irqsave(&ha->lock, flags);
+	if (test_bit(SAS_HA_RESUMING, &ha->state) && !phy->suspended) {
+		struct sas_work *sw = &ev->work;
+
+		list_add_tail(&sw->drain_node, &ha->defer_q);
+		deferred = true;
+	}
+	spin_unlock_irqrestore(&ha->lock, flags);
+	return deferred;
+}
+
+void sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
+			   gfp_t gfp_flags)
+{
+	struct sas_ha_struct *ha = phy->ha;
+	struct asd_sas_event *ev;
+
+	BUG_ON(event >= PORT_NUM_EVENTS);
+
+	ev = sas_alloc_event(phy, gfp_flags);
+	if (!ev)
+		return;
+
+	/* Call pm_runtime_put() with pairs in sas_port_event_worker() */
+	pm_runtime_get_noresume(ha->dev);
+
+	INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
+
+	if (sas_defer_event(phy, ev))
+		return;
+
+	if (!sas_queue_event(event, &ev->work, ha)) {
+		pm_runtime_put(ha->dev);
+		sas_free_event(ev);
+	}
+}
+EXPORT_SYMBOL_GPL(sas_notify_port_event);
+
+void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event,
+			  gfp_t gfp_flags)
+{
+	struct sas_ha_struct *ha = phy->ha;
+	struct asd_sas_event *ev;
+
+	BUG_ON(event >= PHY_NUM_EVENTS);
+
+	ev = sas_alloc_event(phy, gfp_flags);
+	if (!ev)
+		return;
+
+	/* Call pm_runtime_put() with pairs in sas_phy_event_worker() */
+	pm_runtime_get_noresume(ha->dev);
+
+	INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
+
+	if (sas_defer_event(phy, ev))
+		return;
+
+	if (!sas_queue_event(event, &ev->work, ha)) {
+		pm_runtime_put(ha->dev);
+		sas_free_event(ev);
+	}
+}
+EXPORT_SYMBOL_GPL(sas_notify_phy_event);