[linux.git] / drivers / edac / edac_stub.c

/*
 * common EDAC components that must be in kernel
 *
 * Author: Dave Jiang <[email protected]>
 *
 * 2007 (c) MontaVista Software, Inc.
 * 2010 (c) Advanced Micro Devices Inc.
 *	    Borislav Petkov <[email protected]>
 *
 * 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.
 *
 */
#include <linux/module.h>
#include <linux/edac.h>
#include <linux/atomic.h>
#include <asm/edac.h>

int edac_op_state = EDAC_OPSTATE_INVAL;
EXPORT_SYMBOL_GPL(edac_op_state);

atomic_t edac_handlers = ATOMIC_INIT(0);
EXPORT_SYMBOL_GPL(edac_handlers);

int edac_err_assert = 0;
EXPORT_SYMBOL_GPL(edac_err_assert);

static atomic_t edac_subsys_valid = ATOMIC_INIT(0);

/*
 * called to determine if there is an EDAC driver interested in
 * knowing an event (such as NMI) occurred
 */
int edac_handler_set(void)
{
	if (edac_op_state == EDAC_OPSTATE_POLL)
		return 0;

	return atomic_read(&edac_handlers);
}
EXPORT_SYMBOL_GPL(edac_handler_set);

/*
 * handler for NMI type of interrupts to assert error
 */
void edac_atomic_assert_error(void)
{
	edac_err_assert++;
}
EXPORT_SYMBOL_GPL(edac_atomic_assert_error);

/*
 * sysfs object: /sys/devices/system/edac
 *	need to export to other files
 */
struct bus_type edac_subsys = {
	.name = "edac",
	.dev_name = "edac",
};
EXPORT_SYMBOL_GPL(edac_subsys);

/* return pointer to the 'edac' node in sysfs */
struct bus_type *edac_get_sysfs_subsys(void)
{
	int err = 0;

	if (atomic_read(&edac_subsys_valid))
		goto out;

	/* create the /sys/devices/system/edac directory */
	err = subsys_system_register(&edac_subsys, NULL);
	if (err) {
		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
		return NULL;
	}

out:
	atomic_inc(&edac_subsys_valid);
	return &edac_subsys;
}
EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);

void edac_put_sysfs_subsys(void)
{
	/* last user unregisters it */
	if (atomic_dec_and_test(&edac_subsys_valid))
		bus_unregister(&edac_subsys);
}
EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);
Commit	Line	Data
c0d12172 DJ	1	/*
	2	* common EDAC components that must be in kernel
	3	*
	4	* Author: Dave Jiang <[email protected]>
	5	*
30e1f7a8 BP	6	* 2007 (c) MontaVista Software, Inc.
	7	* 2010 (c) Advanced Micro Devices Inc.
	8	* Borislav Petkov <[email protected]>
	9	*
	10	* This file is licensed under the terms of the GNU General Public
	11	* License version 2. This program is licensed "as is" without any
	12	* warranty of any kind, whether express or implied.
c0d12172 DJ	13	*
	14	*/
	15	#include <linux/module.h>
	16	#include <linux/edac.h>
60063497	17	#include <linux/atomic.h>
c0d12172 DJ	18	#include <asm/edac.h>
	19
	20	int edac_op_state = EDAC_OPSTATE_INVAL;
fb3fb206	21	EXPORT_SYMBOL_GPL(edac_op_state);
c0d12172 DJ	22
c0d12172 DJ	23	atomic_t edac_handlers = ATOMIC_INIT(0);
fb3fb206	24	EXPORT_SYMBOL_GPL(edac_handlers);
c0d12172	25
66ee2f94	26	int edac_err_assert = 0;
fb3fb206	27	EXPORT_SYMBOL_GPL(edac_err_assert);
c0d12172	28
fe5ff8b8	29	static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
30e1f7a8	30
fb3fb206 DT	31	/*
	32	* called to determine if there is an EDAC driver interested in
	33	* knowing an event (such as NMI) occurred
	34	*/
	35	int edac_handler_set(void)
c0d12172 DJ	36	{
	37	if (edac_op_state == EDAC_OPSTATE_POLL)
	38	return 0;
	39
	40	return atomic_read(&edac_handlers);
	41	}
fb3fb206	42	EXPORT_SYMBOL_GPL(edac_handler_set);
c0d12172 DJ	43
	44	/*
	45	* handler for NMI type of interrupts to assert error
	46	*/
fb3fb206	47	void edac_atomic_assert_error(void)
c0d12172	48	{
66ee2f94	49	edac_err_assert++;
c0d12172	50	}
fb3fb206	51	EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
30e1f7a8 BP	52
	53	/*
	54	* sysfs object: /sys/devices/system/edac
	55	* need to export to other files
	56	*/
fe5ff8b8	57	struct bus_type edac_subsys = {
30e1f7a8	58	.name = "edac",
fe5ff8b8	59	.dev_name = "edac",
30e1f7a8	60	};
fe5ff8b8	61	EXPORT_SYMBOL_GPL(edac_subsys);
30e1f7a8 BP	62
30e1f7a8 BP	63	/* return pointer to the 'edac' node in sysfs */
fe5ff8b8	64	struct bus_type *edac_get_sysfs_subsys(void)
30e1f7a8 BP	65	{
	66	int err = 0;
	67
fe5ff8b8	68	if (atomic_read(&edac_subsys_valid))
30e1f7a8 BP	69	goto out;
	70
	71	/* create the /sys/devices/system/edac directory */
fe5ff8b8	72	err = subsys_system_register(&edac_subsys, NULL);
30e1f7a8 BP	73	if (err) {
	74	printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
	75	return NULL;
	76	}
	77
	78	out:
fe5ff8b8 KS	79	atomic_inc(&edac_subsys_valid);
fe5ff8b8 KS	80	return &edac_subsys;
30e1f7a8	81	}
fe5ff8b8	82	EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
30e1f7a8	83
fe5ff8b8	84	void edac_put_sysfs_subsys(void)
30e1f7a8 BP	85	{
30e1f7a8 BP	86	/* last user unregisters it */
fe5ff8b8 KS	87	if (atomic_dec_and_test(&edac_subsys_valid))
fe5ff8b8 KS	88	bus_unregister(&edac_subsys);
30e1f7a8	89	}
fe5ff8b8	90	EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);