[linux-2.6-block.git] / drivers / block / aoe / aoemain.c

/* Copyright (c) 2012 Coraid, Inc.  See COPYING for GPL terms. */
/*
 * aoemain.c
 * Module initialization routines, discover timer
 */

#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include "aoe.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sam Hopkins <sah@coraid.com>");
MODULE_DESCRIPTION("AoE block/char driver for 2.6.2 and newer 2.6 kernels");
MODULE_VERSION(VERSION);

enum { TINIT, TRUN, TKILL };

static void
discover_timer(ulong vp)
{
	static struct timer_list t;
	static volatile ulong die;
	static spinlock_t lock;
	ulong flags;
	enum { DTIMERTICK = HZ * 60 }; /* one minute */

	switch (vp) {
	case TINIT:
		init_timer(&t);
		spin_lock_init(&lock);
		t.data = TRUN;
		t.function = discover_timer;
		die = 0;
	case TRUN:
		spin_lock_irqsave(&lock, flags);
		if (!die) {
			t.expires = jiffies + DTIMERTICK;
			add_timer(&t);
		}
		spin_unlock_irqrestore(&lock, flags);

		aoecmd_cfg(0xffff, 0xff);
		return;
	case TKILL:
		spin_lock_irqsave(&lock, flags);
		die = 1;
		spin_unlock_irqrestore(&lock, flags);

		del_timer_sync(&t);
	default:
		return;
	}
}

static void
aoe_exit(void)
{
	discover_timer(TKILL);

	aoenet_exit();
	unregister_blkdev(AOE_MAJOR, DEVICE_NAME);
	aoecmd_exit();
	aoechr_exit();
	aoedev_exit();
	aoeblk_exit();		/* free cache after de-allocating bufs */
}

static int __init
aoe_init(void)
{
	int ret;

	ret = aoedev_init();
	if (ret)
		return ret;
	ret = aoechr_init();
	if (ret)
		goto chr_fail;
	ret = aoeblk_init();
	if (ret)
		goto blk_fail;
	ret = aoenet_init();
	if (ret)
		goto net_fail;
	ret = aoecmd_init();
	if (ret)
		goto cmd_fail;
	ret = register_blkdev(AOE_MAJOR, DEVICE_NAME);
	if (ret < 0) {
		printk(KERN_ERR "aoe: can't register major\n");
		goto blkreg_fail;
	}
	printk(KERN_INFO "aoe: AoE v%s initialised.\n", VERSION);
	discover_timer(TINIT);
	return 0;
 blkreg_fail:
	aoecmd_exit();
 cmd_fail:
	aoenet_exit();
 net_fail:
	aoeblk_exit();
 blk_fail:
	aoechr_exit();
 chr_fail:
	aoedev_exit();

	printk(KERN_INFO "aoe: initialisation failure.\n");
	return ret;
}

module_init(aoe_init);
module_exit(aoe_exit);
Commit	Line	Data
fea05a26	1	/* Copyright (c) 2012 Coraid, Inc. See COPYING for GPL terms. */
1da177e4 LT	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>
e9bb8fb0	10	#include <linux/skbuff.h>
1da177e4 LT	11	#include "aoe.h"
	12
	13	MODULE_LICENSE("GPL");
	14	MODULE_AUTHOR("Sam Hopkins <sah@coraid.com>");
02edb05e	15	MODULE_DESCRIPTION("AoE block/char driver for 2.6.2 and newer 2.6 kernels");
1da177e4 LT	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);
896831f5	64	aoecmd_exit();
1da177e4 LT	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;
896831f5 EC	87	ret = aoecmd_init();
	88	if (ret)
	89	goto cmd_fail;
1da177e4 LT	90	ret = register_blkdev(AOE_MAJOR, DEVICE_NAME);
1da177e4 LT	91	if (ret < 0) {
a12c93f0	92	printk(KERN_ERR "aoe: can't register major\n");
1da177e4 LT	93	goto blkreg_fail;
1da177e4 LT	94	}
a12c93f0	95	printk(KERN_INFO "aoe: AoE v%s initialised.\n", VERSION);
1da177e4 LT	96	discover_timer(TINIT);
1da177e4 LT	97	return 0;
1da177e4	98	blkreg_fail:
896831f5 EC	99	aoecmd_exit();
896831f5 EC	100	cmd_fail:
1da177e4 LT	101	aoenet_exit();
	102	net_fail:
	103	aoeblk_exit();
	104	blk_fail:
	105	aoechr_exit();
	106	chr_fail:
	107	aoedev_exit();
a04b41cd	108
a12c93f0	109	printk(KERN_INFO "aoe: initialisation failure.\n");
1da177e4 LT	110	return ret;
	111	}
	112
	113	module_init(aoe_init);
	114	module_exit(aoe_exit);
	115