1/* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
2/*
3 * aoemain.c
4 * Module initialization routines, discover timer
5 */
6
7#include <linux/hdreg.h>
8#include <linux/blkdev.h>
9#include <linux/module.h>
10#include <linux/skbuff.h>
11#include "aoe.h"
12
13MODULE_LICENSE("GPL");
14MODULE_AUTHOR("Sam Hopkins <sah@coraid.com>");
15MODULE_DESCRIPTION("AoE block/char driver for 2.6.2 and newer 2.6 kernels");
16MODULE_VERSION(VERSION);
17
18enum { TINIT, TRUN, TKILL };
19
20static void
21discover_timer(ulong vp)
22{
23	static struct timer_list t;
24	static volatile ulong die;
25	static spinlock_t lock;
26	ulong flags;
27	enum { DTIMERTICK = HZ * 60 }; /* one minute */
28
29	switch (vp) {
30	case TINIT:
31		init_timer(&t);
32		spin_lock_init(&lock);
33		t.data = TRUN;
34		t.function = discover_timer;
35		die = 0;
36	case TRUN:
37		spin_lock_irqsave(&lock, flags);
38		if (!die) {
39			t.expires = jiffies + DTIMERTICK;
40			add_timer(&t);
41		}
42		spin_unlock_irqrestore(&lock, flags);
43
44		aoecmd_cfg(0xffff, 0xff);
45		return;
46	case TKILL:
47		spin_lock_irqsave(&lock, flags);
48		die = 1;
49		spin_unlock_irqrestore(&lock, flags);
50
51		del_timer_sync(&t);
52	default:
53		return;
54	}
55}
56
57static void
58aoe_exit(void)
59{
60	discover_timer(TKILL);
61
62	aoenet_exit();
63	unregister_blkdev(AOE_MAJOR, DEVICE_NAME);
64	aoechr_exit();
65	aoedev_exit();
66	aoeblk_exit();		/* free cache after de-allocating bufs */
67}
68
69static int __init
70aoe_init(void)
71{
72	int ret;
73
74	ret = aoedev_init();
75	if (ret)
76		return ret;
77	ret = aoechr_init();
78	if (ret)
79		goto chr_fail;
80	ret = aoeblk_init();
81	if (ret)
82		goto blk_fail;
83	ret = aoenet_init();
84	if (ret)
85		goto net_fail;
86	ret = register_blkdev(AOE_MAJOR, DEVICE_NAME);
87	if (ret < 0) {
88		printk(KERN_ERR "aoe: can't register major\n");
89		goto blkreg_fail;
90	}
91
92	printk(KERN_INFO "aoe: AoE v%s initialised.\n", VERSION);
93	discover_timer(TINIT);
94	return 0;
95
96 blkreg_fail:
97	aoenet_exit();
98 net_fail:
99	aoeblk_exit();
100 blk_fail:
101	aoechr_exit();
102 chr_fail:
103	aoedev_exit();
104
105	printk(KERN_INFO "aoe: initialisation failure.\n");
106	return ret;
107}
108
109module_init(aoe_init);
110module_exit(aoe_exit);
111
112