Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
4e8e56c6 | 2 | * Support for adapter interruptions |
1da177e4 | 3 | * |
a53c8fab | 4 | * Copyright IBM Corp. 1999, 2007 |
4e8e56c6 PO |
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> | |
1da177e4 LT |
9 | */ |
10 | ||
11 | #include <linux/init.h> | |
f4eae94f MS |
12 | #include <linux/irq.h> |
13 | #include <linux/kernel_stat.h> | |
1da177e4 | 14 | #include <linux/module.h> |
f4eae94f MS |
15 | #include <linux/mutex.h> |
16 | #include <linux/rculist.h> | |
1da177e4 | 17 | #include <linux/slab.h> |
1da177e4 | 18 | |
4e8e56c6 | 19 | #include <asm/airq.h> |
da7c5af8 | 20 | #include <asm/isc.h> |
4e8e56c6 PO |
21 | |
22 | #include "cio.h" | |
1da177e4 | 23 | #include "cio_debug.h" |
f4eae94f | 24 | #include "ioasm.h" |
1da177e4 | 25 | |
f4eae94f MS |
26 | static DEFINE_SPINLOCK(airq_lists_lock); |
27 | static struct hlist_head airq_lists[MAX_ISC+1]; | |
1da177e4 | 28 | |
4e8e56c6 | 29 | /** |
f4eae94f MS |
30 | * register_adapter_interrupt() - register adapter interrupt handler |
31 | * @airq: pointer to adapter interrupt descriptor | |
4e8e56c6 | 32 | * |
f4eae94f | 33 | * Returns 0 on success, or -EINVAL. |
4e8e56c6 | 34 | */ |
f4eae94f | 35 | int register_adapter_interrupt(struct airq_struct *airq) |
1da177e4 | 36 | { |
f4eae94f MS |
37 | char dbf_txt[32]; |
38 | ||
39 | if (!airq->handler || airq->isc > MAX_ISC) | |
40 | return -EINVAL; | |
41 | if (!airq->lsi_ptr) { | |
42 | airq->lsi_ptr = kzalloc(1, GFP_KERNEL); | |
43 | if (!airq->lsi_ptr) | |
44 | return -ENOMEM; | |
45 | airq->flags |= AIRQ_PTR_ALLOCATED; | |
1da177e4 | 46 | } |
f4eae94f MS |
47 | if (!airq->lsi_mask) |
48 | airq->lsi_mask = 0xff; | |
49 | snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%p", airq); | |
4e8e56c6 | 50 | CIO_TRACE_EVENT(4, dbf_txt); |
f4eae94f MS |
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); | |
55 | return 0; | |
1da177e4 | 56 | } |
f4eae94f | 57 | EXPORT_SYMBOL(register_adapter_interrupt); |
1da177e4 | 58 | |
4e8e56c6 | 59 | /** |
f4eae94f MS |
60 | * unregister_adapter_interrupt - unregister adapter interrupt handler |
61 | * @airq: pointer to adapter interrupt descriptor | |
4e8e56c6 | 62 | */ |
f4eae94f | 63 | void unregister_adapter_interrupt(struct airq_struct *airq) |
1da177e4 | 64 | { |
f4eae94f | 65 | char dbf_txt[32]; |
1da177e4 | 66 | |
f4eae94f MS |
67 | if (hlist_unhashed(&airq->list)) |
68 | return; | |
69 | snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%p", airq); | |
4e8e56c6 | 70 | CIO_TRACE_EVENT(4, dbf_txt); |
f4eae94f MS |
71 | spin_lock(&airq_lists_lock); |
72 | hlist_del_rcu(&airq->list); | |
73 | spin_unlock(&airq_lists_lock); | |
74 | synchronize_rcu(); | |
75 | isc_unregister(airq->isc); | |
76 | if (airq->flags & AIRQ_PTR_ALLOCATED) { | |
77 | kfree(airq->lsi_ptr); | |
78 | airq->lsi_ptr = NULL; | |
79 | airq->flags &= ~AIRQ_PTR_ALLOCATED; | |
80 | } | |
1da177e4 | 81 | } |
f4eae94f | 82 | EXPORT_SYMBOL(unregister_adapter_interrupt); |
1da177e4 | 83 | |
da7c5af8 | 84 | void do_adapter_IO(u8 isc) |
4e8e56c6 | 85 | { |
f4eae94f MS |
86 | struct airq_struct *airq; |
87 | struct hlist_head *head; | |
88 | ||
89 | head = &airq_lists[isc]; | |
90 | rcu_read_lock(); | |
91 | hlist_for_each_entry_rcu(airq, head, list) | |
92 | if ((*airq->lsi_ptr & airq->lsi_mask) != 0) | |
93 | airq->handler(airq); | |
94 | rcu_read_unlock(); | |
4e8e56c6 | 95 | } |