sas_event.c

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/*
 * Serial Attached SCSI (SAS) Event processing
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <[email protected]>
 *
 * 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"

void sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
{
    if (!test_bit(SAS_HA_REGISTERED, &ha->state))
        return;

    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(&sw->drain_node, &ha->defer_q);
    } else
        scsi_queue_work(ha->core.shost, &sw->work);
}

static void sas_queue_event(int event, unsigned long *pending,
                struct sas_work *work,
                struct sas_ha_struct *ha)
{
    if (!test_and_set_bit(event, pending)) {
        unsigned long flags;

        spin_lock_irqsave(&ha->lock, flags);
        sas_queue_work(ha, work);
        spin_unlock_irqrestore(&ha->lock, flags);
    }
}


void __sas_drain_work(struct sas_ha_struct *ha)
{
    struct workqueue_struct *wq = ha->core.shost->work_q;
    struct sas_work *sw, *_sw;

    set_bit(SAS_HA_DRAINING, &ha->state);
    /* flush submitters */
    spin_lock_irq(&ha->lock);
    spin_unlock_irq(&ha->lock);

    drain_workqueue(wq);

    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);
        sas_queue_work(ha, sw);
    }
    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;

        if (!test_and_clear_bit(ev, &d->pending))
            continue;

        sas_queue_event(ev, &d->pending, &d->disc_work[ev].work, ha);
    }
    mutex_unlock(&ha->disco_mutex);
}

static void notify_ha_event(struct sas_ha_struct *sas_ha, enum ha_event event)
{
    BUG_ON(event >= HA_NUM_EVENTS);

    sas_queue_event(event, &sas_ha->pending,
            &sas_ha->ha_events[event].work, sas_ha);
}

static void notify_port_event(struct asd_sas_phy *phy, enum port_event event)
{
    struct sas_ha_struct *ha = phy->ha;

    BUG_ON(event >= PORT_NUM_EVENTS);

    sas_queue_event(event, &phy->port_events_pending,
            &phy->port_events[event].work, ha);
}

void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
{
    struct sas_ha_struct *ha = phy->ha;

    BUG_ON(event >= PHY_NUM_EVENTS);

    sas_queue_event(event, &phy->phy_events_pending,
            &phy->phy_events[event].work, ha);
}

int sas_init_events(struct sas_ha_struct *sas_ha)
{
    static const work_func_t sas_ha_event_fns[HA_NUM_EVENTS] = {
        [HAE_RESET] = sas_hae_reset,
    };

    int i;

    for (i = 0; i < HA_NUM_EVENTS; i++) {
        INIT_SAS_WORK(&sas_ha->ha_events[i].work, sas_ha_event_fns[i]);
        sas_ha->ha_events[i].ha = sas_ha;
    }

    sas_ha->notify_ha_event = notify_ha_event;
    sas_ha->notify_port_event = notify_port_event;
    sas_ha->notify_phy_event = sas_notify_phy_event;

    return 0;
}