2 * Support for adapter interruptions
4 * Copyright IBM Corp. 1999, 2007
5 * Author(s): Ingo Adlung <adlung@de.ibm.com>
6 * Cornelia Huck <cornelia.huck@de.ibm.com>
7 * Arnd Bergmann <arndb@de.ibm.com>
8 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
11 #include <linux/init.h>
12 #include <linux/irq.h>
13 #include <linux/kernel_stat.h>
14 #include <linux/module.h>
15 #include <linux/mutex.h>
16 #include <linux/rculist.h>
17 #include <linux/slab.h>
23 #include "cio_debug.h"
26 static DEFINE_SPINLOCK(airq_lists_lock);
27 static struct hlist_head airq_lists[MAX_ISC+1];
30 * register_adapter_interrupt() - register adapter interrupt handler
31 * @airq: pointer to adapter interrupt descriptor
33 * Returns 0 on success, or -EINVAL.
35 int register_adapter_interrupt(struct airq_struct *airq)
39 if (!airq->handler || airq->isc > MAX_ISC)
42 airq->lsi_ptr = kzalloc(1, GFP_KERNEL);
45 airq->flags |= AIRQ_PTR_ALLOCATED;
48 airq->lsi_mask = 0xff;
49 snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%p", airq);
50 CIO_TRACE_EVENT(4, dbf_txt);
51 isc_register(airq->isc);
52 spin_lock(&airq_lists_lock);
53 hlist_add_head_rcu(&airq->list, &airq_lists[airq->isc]);
54 spin_unlock(&airq_lists_lock);
57 EXPORT_SYMBOL(register_adapter_interrupt);
60 * unregister_adapter_interrupt - unregister adapter interrupt handler
61 * @airq: pointer to adapter interrupt descriptor
63 void unregister_adapter_interrupt(struct airq_struct *airq)
67 if (hlist_unhashed(&airq->list))
69 snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%p", airq);
70 CIO_TRACE_EVENT(4, dbf_txt);
71 spin_lock(&airq_lists_lock);
72 hlist_del_rcu(&airq->list);
73 spin_unlock(&airq_lists_lock);
75 isc_unregister(airq->isc);
76 if (airq->flags & AIRQ_PTR_ALLOCATED) {
79 airq->flags &= ~AIRQ_PTR_ALLOCATED;
82 EXPORT_SYMBOL(unregister_adapter_interrupt);
84 void do_adapter_IO(u8 isc)
86 struct airq_struct *airq;
87 struct hlist_head *head;
89 head = &airq_lists[isc];
91 hlist_for_each_entry_rcu(airq, head, list)
92 if ((*airq->lsi_ptr & airq->lsi_mask) != 0)