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// 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"
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_queue_deferred_work(struct sas_ha_struct *ha)
{
struct sas_work *sw, *_sw;
int ret;
spin_lock_irq(&ha->lock);
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) {
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;
}
int 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;
int ret;
BUG_ON(event >= PORT_NUM_EVENTS);
ev = sas_alloc_event(phy, gfp_flags);
if (!ev)
return -ENOMEM;
/* 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 0;
ret = sas_queue_event(event, &ev->work, ha);
if (ret != 1) {
pm_runtime_put(ha->dev);
sas_free_event(ev);
}
return ret;
}
EXPORT_SYMBOL_GPL(sas_notify_port_event);
int 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;
int ret;
BUG_ON(event >= PHY_NUM_EVENTS);
ev = sas_alloc_event(phy, gfp_flags);
if (!ev)
return -ENOMEM;
/* 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 0;
ret = sas_queue_event(event, &ev->work, ha);
if (ret != 1) {
pm_runtime_put(ha->dev);
sas_free_event(ev);
}
return ret;
}
EXPORT_SYMBOL_GPL(sas_notify_phy_event);
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