[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / edac / edac_module.c

/*
 * edac_module.c
 *
 * (C) 2007 www.douglaskthompson.com
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 *
 * Author: Doug Thompson <norsk5@xmission.com>
 *
 */
#include <linux/edac.h>

#include "edac_core.h"
#include "edac_module.h"

#define EDAC_MC_VERSION "Ver: 2.0.4 " __DATE__

#ifdef CONFIG_EDAC_DEBUG
/* Values of 0 to 4 will generate output */
int edac_debug_level = 1;
EXPORT_SYMBOL_GPL(edac_debug_level);
#endif

/* scope is to module level only */
struct workqueue_struct *edac_workqueue;

/*
 * sysfs object: /sys/devices/system/edac
 *	need to export to other files in this modules
 */
static struct sysdev_class edac_class = {
	set_kset_name("edac"),
};
static int edac_class_valid = 0;

/*
 * edac_get_edac_class()
 *
 *	return pointer to the edac class of 'edac'
 */
struct sysdev_class *edac_get_edac_class(void)
{
	struct sysdev_class *classptr=NULL;

	if (edac_class_valid)
		classptr = &edac_class;

	return classptr;
}

/*
 * edac_register_sysfs_edac_name()
 *
 *	register the 'edac' into /sys/devices/system
 *
 * return:
 *	0  success
 *	!0 error
 */
static int edac_register_sysfs_edac_name(void)
{
	int err;

	/* create the /sys/devices/system/edac directory */
	err = sysdev_class_register(&edac_class);

	if (err) {
		debugf1("%s() error=%d\n", __func__, err);
		return err;
	}

	edac_class_valid = 1;
	return 0;
}

/*
 * sysdev_class_unregister()
 *
 *	unregister the 'edac' from /sys/devices/system
 */
static void edac_unregister_sysfs_edac_name(void)
{
	/* only if currently registered, then unregister it */
	if (edac_class_valid)
		sysdev_class_unregister(&edac_class);

	edac_class_valid = 0;
}

/*
 * edac_workqueue_setup
 *	initialize the edac work queue for polling operations
 */
static int edac_workqueue_setup(void)
{
	edac_workqueue = create_singlethread_workqueue("edac-poller");
	if (edac_workqueue == NULL)
		return -ENODEV;
	else
		return 0;
}

/*
 * edac_workqueue_teardown
 *	teardown the edac workqueue
 */
static void edac_workqueue_teardown(void)
{
	if (edac_workqueue) {
		flush_workqueue(edac_workqueue);
		destroy_workqueue(edac_workqueue);
		edac_workqueue = NULL;
	}
}


/*
 * edac_init
 *      module initialization entry point
 */
static int __init edac_init(void)
{
	int err = 0;

	edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");

	/*
	 * Harvest and clear any boot/initialization PCI parity errors
	 *
	 * FIXME: This only clears errors logged by devices present at time of
	 * 	module initialization.  We should also do an initial clear
	 *	of each newly hotplugged device.
	 */
	edac_pci_clear_parity_errors();

	/*
	 * perform the registration of the /sys/devices/system/edac object
	 */
	if (edac_register_sysfs_edac_name()) {
		edac_printk(KERN_ERR, EDAC_MC,
			"Error initializing 'edac' kobject\n");
		err = -ENODEV;
		goto error;
	}

	/* Create the MC sysfs entries, must be first
	 */
	if (edac_sysfs_memctrl_setup()) {
		edac_printk(KERN_ERR, EDAC_MC,
			"Error initializing sysfs code\n");
		err = -ENODEV;
		goto error_sysfs;
	}

	/* Create the PCI parity sysfs entries */
	if (edac_sysfs_pci_setup()) {
		edac_printk(KERN_ERR, EDAC_MC,
			"PCI: Error initializing sysfs code\n");
		err = -ENODEV;
		goto error_mem;
	}

	/* Setup/Initialize the edac_device system */
	err = edac_workqueue_setup();
	if (err) {
		edac_printk(KERN_ERR, EDAC_MC, "init WorkQueue failure\n");
		goto error_pci;
	}

	return 0;

	/* Error teardown stack */
error_pci:
	edac_sysfs_pci_teardown();
error_mem:
	edac_sysfs_memctrl_teardown();
error_sysfs:
	edac_unregister_sysfs_edac_name();
error:
	return err;
}

/*
 * edac_exit()
 *      module exit/termination function
 */
static void __exit edac_exit(void)
{
	debugf0("%s()\n", __func__);

	/* tear down the various subsystems*/
	edac_workqueue_teardown();
	edac_sysfs_memctrl_teardown();
	edac_sysfs_pci_teardown();
	edac_unregister_sysfs_edac_name();
}

/*
 * Inform the kernel of our entry and exit points
 */
module_init(edac_init);
module_exit(edac_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
MODULE_DESCRIPTION("Core library routines for EDAC reporting");

/* refer to *_sysfs.c files for parameters that are exported via sysfs */

#ifdef CONFIG_EDAC_DEBUG
module_param(edac_debug_level, int, 0644);
MODULE_PARM_DESC(edac_debug_level, "Debug level");
#endif
Commit	Line	Data
81d87cb1 DJ	1	/*
	2	* edac_module.c
	3	*
	4	* (C) 2007 www.douglaskthompson.com
	5	* This file is licensed under the terms of the GNU General Public
	6	* License version 2. This program is licensed "as is" without any
	7	* warranty of any kind, whether express or implied.
	8	*
	9	* Author: Doug Thompson <norsk5@xmission.com>
	10	*
	11	*/
c0d12172	12	#include <linux/edac.h>
7c9281d7	13
20bcb7a8	14	#include "edac_core.h"
7c9281d7 DT	15	#include "edac_module.h"
7c9281d7 DT	16
20bcb7a8	17	#define EDAC_MC_VERSION "Ver: 2.0.4 " __DATE__
7c9281d7 DT	18
	19	#ifdef CONFIG_EDAC_DEBUG
	20	/* Values of 0 to 4 will generate output */
	21	int edac_debug_level = 1;
	22	EXPORT_SYMBOL_GPL(edac_debug_level);
	23	#endif
	24
e27e3dac DT	25	/* scope is to module level only */
	26	struct workqueue_struct *edac_workqueue;
	27
e27e3dac DT	28	/*
	29	* sysfs object: /sys/devices/system/edac
	30	* need to export to other files in this modules
	31	*/
	32	static struct sysdev_class edac_class = {
	33	set_kset_name("edac"),
	34	};
	35	static int edac_class_valid = 0;
	36
	37	/*
	38	* edac_get_edac_class()
	39	*
	40	* return pointer to the edac class of 'edac'
	41	*/
	42	struct sysdev_class *edac_get_edac_class(void)
	43	{
	44	struct sysdev_class *classptr=NULL;
	45
	46	if (edac_class_valid)
	47	classptr = &edac_class;
	48
	49	return classptr;
	50	}
	51
	52	/*
	53	* edac_register_sysfs_edac_name()
	54	*
	55	* register the 'edac' into /sys/devices/system
	56	*
	57	* return:
	58	* 0 success
	59	* !0 error
	60	*/
	61	static int edac_register_sysfs_edac_name(void)
	62	{
	63	int err;
	64
	65	/* create the /sys/devices/system/edac directory */
	66	err = sysdev_class_register(&edac_class);
	67
	68	if (err) {
	69	debugf1("%s() error=%d\n", __func__, err);
	70	return err;
	71	}
	72
	73	edac_class_valid = 1;
	74	return 0;
	75	}
	76
	77	/*
	78	* sysdev_class_unregister()
	79	*
	80	* unregister the 'edac' from /sys/devices/system
	81	*/
	82	static void edac_unregister_sysfs_edac_name(void)
	83	{
	84	/* only if currently registered, then unregister it */
	85	if (edac_class_valid)
	86	sysdev_class_unregister(&edac_class);
	87
	88	edac_class_valid = 0;
	89	}
	90
e27e3dac DT	91	/*
	92	* edac_workqueue_setup
	93	* initialize the edac work queue for polling operations
	94	*/
	95	static int edac_workqueue_setup(void)
	96	{
	97	edac_workqueue = create_singlethread_workqueue("edac-poller");
	98	if (edac_workqueue == NULL)
	99	return -ENODEV;
	100	else
	101	return 0;
	102	}
	103
	104	/*
	105	* edac_workqueue_teardown
	106	* teardown the edac workqueue
	107	*/
	108	static void edac_workqueue_teardown(void)
	109	{
	110	if (edac_workqueue) {
	111	flush_workqueue(edac_workqueue);
	112	destroy_workqueue(edac_workqueue);
	113	edac_workqueue = NULL;
	114	}
	115	}
	116
	117
7c9281d7 DT	118	/*
	119	* edac_init
	120	* module initialization entry point
	121	*/
	122	static int __init edac_init(void)
	123	{
e27e3dac DT	124	int err = 0;
e27e3dac DT	125
7c9281d7 DT	126	edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");
	127
	128	/*
	129	* Harvest and clear any boot/initialization PCI parity errors
	130	*
	131	* FIXME: This only clears errors logged by devices present at time of
	132	* module initialization. We should also do an initial clear
	133	* of each newly hotplugged device.
	134	*/
	135	edac_pci_clear_parity_errors();
	136
e27e3dac DT	137	/*
	138	* perform the registration of the /sys/devices/system/edac object
	139	*/
	140	if (edac_register_sysfs_edac_name()) {
	141	edac_printk(KERN_ERR, EDAC_MC,
	142	"Error initializing 'edac' kobject\n");
	143	err = -ENODEV;
	144	goto error;
	145	}
	146
	147	/* Create the MC sysfs entries, must be first
	148	*/
7c9281d7 DT	149	if (edac_sysfs_memctrl_setup()) {
	150	edac_printk(KERN_ERR, EDAC_MC,
	151	"Error initializing sysfs code\n");
e27e3dac DT	152	err = -ENODEV;
e27e3dac DT	153	goto error_sysfs;
7c9281d7 DT	154	}
	155
	156	/* Create the PCI parity sysfs entries */
	157	if (edac_sysfs_pci_setup()) {
7c9281d7 DT	158	edac_printk(KERN_ERR, EDAC_MC,
7c9281d7 DT	159	"PCI: Error initializing sysfs code\n");
e27e3dac DT	160	err = -ENODEV;
	161	goto error_mem;
	162	}
	163
	164	/* Setup/Initialize the edac_device system */
	165	err = edac_workqueue_setup();
	166	if (err) {
	167	edac_printk(KERN_ERR, EDAC_MC, "init WorkQueue failure\n");
	168	goto error_pci;
7c9281d7 DT	169	}
7c9281d7 DT	170
7c9281d7	171	return 0;
e27e3dac DT	172
e27e3dac DT	173	/* Error teardown stack */
e27e3dac DT	174	error_pci:
	175	edac_sysfs_pci_teardown();
	176	error_mem:
	177	edac_sysfs_memctrl_teardown();
	178	error_sysfs:
	179	edac_unregister_sysfs_edac_name();
	180	error:
	181	return err;
7c9281d7 DT	182	}
	183
	184	/*
	185	* edac_exit()
	186	* module exit/termination function
	187	*/
	188	static void __exit edac_exit(void)
	189	{
	190	debugf0("%s()\n", __func__);
7c9281d7	191
e27e3dac DT	192	/* tear down the various subsystems*/
e27e3dac DT	193	edac_workqueue_teardown();
7c9281d7 DT	194	edac_sysfs_memctrl_teardown();
7c9281d7 DT	195	edac_sysfs_pci_teardown();
e27e3dac	196	edac_unregister_sysfs_edac_name();
7c9281d7 DT	197	}
	198
	199	/*
	200	* Inform the kernel of our entry and exit points
	201	*/
	202	module_init(edac_init);
	203	module_exit(edac_exit);
	204
	205	MODULE_LICENSE("GPL");
	206	MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
	207	MODULE_DESCRIPTION("Core library routines for EDAC reporting");
	208
	209	/* refer to _sysfs.c files for parameters that are exported via sysfs /
	210
	211	#ifdef CONFIG_EDAC_DEBUG
	212	module_param(edac_debug_level, int, 0644);
	213	MODULE_PARM_DESC(edac_debug_level, "Debug level");
	214	#endif
	215