96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/*
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* Support for adapter interruptions
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*
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* Copyright IBM Corp. 1999, 2007
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* Author(s): Ingo Adlung <adlung@de.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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* Arnd Bergmann <arndb@de.ibm.com>
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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/kernel_stat.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/rculist.h>
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#include <linux/slab.h>
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#include <asm/airq.h>
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#include <asm/isc.h>
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#include "cio.h"
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#include "cio_debug.h"
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#include "ioasm.h"
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static DEFINE_SPINLOCK(airq_lists_lock);
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static struct hlist_head airq_lists[MAX_ISC+1];
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/**
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* register_adapter_interrupt() - register adapter interrupt handler
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* @airq: pointer to adapter interrupt descriptor
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*
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* Returns 0 on success, or -EINVAL.
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*/
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int register_adapter_interrupt(struct airq_struct *airq)
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{
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char dbf_txt[32];
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if (!airq->handler || airq->isc > MAX_ISC)
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return -EINVAL;
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if (!airq->lsi_ptr) {
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airq->lsi_ptr = kzalloc(1, GFP_KERNEL);
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if (!airq->lsi_ptr)
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return -ENOMEM;
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airq->flags |= AIRQ_PTR_ALLOCATED;
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}
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if (!airq->lsi_mask)
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airq->lsi_mask = 0xff;
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snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%p", airq);
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CIO_TRACE_EVENT(4, dbf_txt);
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isc_register(airq->isc);
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spin_lock(&airq_lists_lock);
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hlist_add_head_rcu(&airq->list, &airq_lists[airq->isc]);
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spin_unlock(&airq_lists_lock);
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return 0;
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}
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EXPORT_SYMBOL(register_adapter_interrupt);
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/**
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* unregister_adapter_interrupt - unregister adapter interrupt handler
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* @airq: pointer to adapter interrupt descriptor
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*/
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void unregister_adapter_interrupt(struct airq_struct *airq)
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{
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char dbf_txt[32];
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if (hlist_unhashed(&airq->list))
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return;
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snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%p", airq);
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CIO_TRACE_EVENT(4, dbf_txt);
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spin_lock(&airq_lists_lock);
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hlist_del_rcu(&airq->list);
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spin_unlock(&airq_lists_lock);
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synchronize_rcu();
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isc_unregister(airq->isc);
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if (airq->flags & AIRQ_PTR_ALLOCATED) {
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kfree(airq->lsi_ptr);
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airq->lsi_ptr = NULL;
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airq->flags &= ~AIRQ_PTR_ALLOCATED;
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}
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}
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EXPORT_SYMBOL(unregister_adapter_interrupt);
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void do_adapter_IO(u8 isc)
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{
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struct airq_struct *airq;
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struct hlist_head *head;
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head = &airq_lists[isc];
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rcu_read_lock();
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hlist_for_each_entry_rcu(airq, head, list)
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if ((*airq->lsi_ptr & airq->lsi_mask) != 0)
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airq->handler(airq);
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rcu_read_unlock();
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}
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