linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *    Support for adapter interruptions

 *

 *    Copyright IBM Corp. 1999, 2007

 *    Author(s): Ingo Adlung <adlung@de.ibm.com>

 *       Cornelia Huck <cornelia.huck@de.ibm.com>

 *       Arnd Bergmann <arndb@de.ibm.com>

 *       Peter Oberparleiter <peter.oberparleiter@de.ibm.com>

 */

​

#include <linux/init.h>

#include <linux/irq.h>

#include <linux/kernel_stat.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/rculist.h>

#include <linux/slab.h>

​

#include <asm/airq.h>

#include <asm/isc.h>

​

#include "cio.h"

#include "cio_debug.h"

#include "ioasm.h"

​

static DEFINE_SPINLOCK(airq_lists_lock);

static struct hlist_head airq_lists[MAX_ISC+1];

​

/**

 * register_adapter_interrupt() - register adapter interrupt handler

 * @airq: pointer to adapter interrupt descriptor

 *

 * Returns 0 on success, or -EINVAL.

 */

int register_adapter_interrupt(struct airq_struct *airq)

{

    char dbf_txt[32];

​

    if (!airq->handler || airq->isc > MAX_ISC)

        return -EINVAL;

    if (!airq->lsi_ptr) {

        airq->lsi_ptr = kzalloc(1, GFP_KERNEL);

        if (!airq->lsi_ptr)

            return -ENOMEM;

        airq->flags |= AIRQ_PTR_ALLOCATED;

    }

    if (!airq->lsi_mask)

        airq->lsi_mask = 0xff;

    snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%p", airq);

    CIO_TRACE_EVENT(4, dbf_txt);

    isc_register(airq->isc);

    spin_lock(&airq_lists_lock);

    hlist_add_head_rcu(&airq->list, &airq_lists[airq->isc]);

    spin_unlock(&airq_lists_lock);

    return 0;

}

EXPORT_SYMBOL(register_adapter_interrupt);

​

/**

 * unregister_adapter_interrupt - unregister adapter interrupt handler

 * @airq: pointer to adapter interrupt descriptor

 */