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); 115 116