Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / block / aoe / aoemain.c
1 /* Copyright (c) 2012 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
13 MODULE_LICENSE("GPL");
14 MODULE_AUTHOR("Sam Hopkins <sah@coraid.com>");
15 MODULE_DESCRIPTION("AoE block/char driver for 2.6.2 and newer 2.6 kernels");
16 MODULE_VERSION(VERSION);
17
18 enum { TINIT, TRUN, TKILL };
19
20 static void
21 discover_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
57 static void
58 aoe_exit(void)
59 {
60         discover_timer(TKILL);
61
62         aoenet_exit();
63         unregister_blkdev(AOE_MAJOR, DEVICE_NAME);
64         aoecmd_exit();
65         aoechr_exit();
66         aoedev_exit();
67         aoeblk_exit();          /* free cache after de-allocating bufs */
68 }
69
70 static int __init
71 aoe_init(void)
72 {
73         int ret;
74
75         ret = aoedev_init();
76         if (ret)
77                 return ret;
78         ret = aoechr_init();
79         if (ret)
80                 goto chr_fail;
81         ret = aoeblk_init();
82         if (ret)
83                 goto blk_fail;
84         ret = aoenet_init();
85         if (ret)
86                 goto net_fail;
87         ret = aoecmd_init();
88         if (ret)
89                 goto cmd_fail;
90         ret = register_blkdev(AOE_MAJOR, DEVICE_NAME);
91         if (ret < 0) {
92                 printk(KERN_ERR "aoe: can't register major\n");
93                 goto blkreg_fail;
94         }
95         printk(KERN_INFO "aoe: AoE v%s initialised.\n", VERSION);
96         discover_timer(TINIT);
97         return 0;
98  blkreg_fail:
99         aoecmd_exit();
100  cmd_fail:
101         aoenet_exit();
102  net_fail:
103         aoeblk_exit();
104  blk_fail:
105         aoechr_exit();
106  chr_fail:
107         aoedev_exit();
108
109         printk(KERN_INFO "aoe: initialisation failure.\n");
110         return ret;
111 }
112
113 module_init(aoe_init);
114 module_exit(aoe_exit);
115