![Jason Yan](/assets/img/avatar_default.png)
There are two places queuing the disco event DISCE_REVALIDATE_DOMAIN. One is in sas_porte_broadcast_rcvd() and uses sas_chain_event() to queue the event. The other is in sas_enable_revalidation() and uses sas_queue_event() to queue the event. We have diffrent work queues for event and discovery now, so the DISCE_REVALIDATE_DOMAIN event may be processed in both event queue and discovery queue. Now since we do synchronous event handling, we cannot do it in discovery queue, so have to trigger a fake broadcast event to re-trigger the revalidation from event queue. Signed-off-by: Jason Yan <yanaijie@huawei.com> CC: John Garry <john.garry@huawei.com> CC: Johannes Thumshirn <jthumshirn@suse.de> CC: Ewan Milne <emilne@redhat.com> CC: Christoph Hellwig <hch@lst.de> CC: Tomas Henzl <thenzl@redhat.com> CC: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
200 lines
4.6 KiB
C
200 lines
4.6 KiB
C
/*
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* Serial Attached SCSI (SAS) Event processing
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*
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
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* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
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*
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* This file is licensed under GPLv2.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/export.h>
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#include <scsi/scsi_host.h>
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#include "sas_internal.h"
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#include "sas_dump.h"
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int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
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{
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/* it's added to the defer_q when draining so return succeed */
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int rc = 1;
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if (!test_bit(SAS_HA_REGISTERED, &ha->state))
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return 0;
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if (test_bit(SAS_HA_DRAINING, &ha->state)) {
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/* add it to the defer list, if not already pending */
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if (list_empty(&sw->drain_node))
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list_add_tail(&sw->drain_node, &ha->defer_q);
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} else
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rc = queue_work(ha->event_q, &sw->work);
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return rc;
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}
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static int sas_queue_event(int event, struct sas_work *work,
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struct sas_ha_struct *ha)
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{
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unsigned long flags;
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int rc;
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spin_lock_irqsave(&ha->lock, flags);
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rc = sas_queue_work(ha, work);
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spin_unlock_irqrestore(&ha->lock, flags);
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return rc;
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}
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void __sas_drain_work(struct sas_ha_struct *ha)
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{
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struct sas_work *sw, *_sw;
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int ret;
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set_bit(SAS_HA_DRAINING, &ha->state);
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/* flush submitters */
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spin_lock_irq(&ha->lock);
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spin_unlock_irq(&ha->lock);
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drain_workqueue(ha->event_q);
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drain_workqueue(ha->disco_q);
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spin_lock_irq(&ha->lock);
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clear_bit(SAS_HA_DRAINING, &ha->state);
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list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
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list_del_init(&sw->drain_node);
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ret = sas_queue_work(ha, sw);
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if (ret != 1)
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sas_free_event(to_asd_sas_event(&sw->work));
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}
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spin_unlock_irq(&ha->lock);
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}
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int sas_drain_work(struct sas_ha_struct *ha)
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{
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int err;
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err = mutex_lock_interruptible(&ha->drain_mutex);
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if (err)
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return err;
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if (test_bit(SAS_HA_REGISTERED, &ha->state))
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__sas_drain_work(ha);
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mutex_unlock(&ha->drain_mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sas_drain_work);
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void sas_disable_revalidation(struct sas_ha_struct *ha)
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{
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mutex_lock(&ha->disco_mutex);
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set_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
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mutex_unlock(&ha->disco_mutex);
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}
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void sas_enable_revalidation(struct sas_ha_struct *ha)
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{
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int i;
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mutex_lock(&ha->disco_mutex);
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clear_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state);
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for (i = 0; i < ha->num_phys; i++) {
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struct asd_sas_port *port = ha->sas_port[i];
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const int ev = DISCE_REVALIDATE_DOMAIN;
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struct sas_discovery *d = &port->disc;
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struct asd_sas_phy *sas_phy;
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if (!test_and_clear_bit(ev, &d->pending))
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continue;
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if (list_empty(&port->phy_list))
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continue;
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sas_phy = container_of(port->phy_list.next, struct asd_sas_phy,
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port_phy_el);
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ha->notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
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}
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mutex_unlock(&ha->disco_mutex);
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}
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static void sas_port_event_worker(struct work_struct *work)
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{
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struct asd_sas_event *ev = to_asd_sas_event(work);
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sas_port_event_fns[ev->event](work);
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sas_free_event(ev);
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}
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static void sas_phy_event_worker(struct work_struct *work)
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{
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struct asd_sas_event *ev = to_asd_sas_event(work);
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sas_phy_event_fns[ev->event](work);
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sas_free_event(ev);
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}
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static int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
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{
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struct asd_sas_event *ev;
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struct sas_ha_struct *ha = phy->ha;
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int ret;
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BUG_ON(event >= PORT_NUM_EVENTS);
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ev = sas_alloc_event(phy);
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if (!ev)
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return -ENOMEM;
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INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
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ret = sas_queue_event(event, &ev->work, ha);
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if (ret != 1)
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sas_free_event(ev);
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return ret;
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}
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int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
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{
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struct asd_sas_event *ev;
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struct sas_ha_struct *ha = phy->ha;
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int ret;
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BUG_ON(event >= PHY_NUM_EVENTS);
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ev = sas_alloc_event(phy);
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if (!ev)
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return -ENOMEM;
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INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
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ret = sas_queue_event(event, &ev->work, ha);
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if (ret != 1)
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sas_free_event(ev);
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return ret;
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}
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int sas_init_events(struct sas_ha_struct *sas_ha)
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{
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sas_ha->notify_port_event = sas_notify_port_event;
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sas_ha->notify_phy_event = sas_notify_phy_event;
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return 0;
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}
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