92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/*
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* common EDAC components that must be in kernel
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*
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* Author: Dave Jiang <djiang@mvista.com>
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*
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* 2007 (c) MontaVista Software, Inc.
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* 2010 (c) Advanced Micro Devices Inc.
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* Borislav Petkov <borislav.petkov@amd.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*
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*/
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#include <linux/module.h>
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#include <linux/edac.h>
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#include <linux/atomic.h>
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#include <linux/device.h>
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#include <asm/edac.h>
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int edac_op_state = EDAC_OPSTATE_INVAL;
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EXPORT_SYMBOL_GPL(edac_op_state);
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atomic_t edac_handlers = ATOMIC_INIT(0);
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EXPORT_SYMBOL_GPL(edac_handlers);
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int edac_err_assert = 0;
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EXPORT_SYMBOL_GPL(edac_err_assert);
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static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
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/*
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* called to determine if there is an EDAC driver interested in
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* knowing an event (such as NMI) occurred
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*/
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int edac_handler_set(void)
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{
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if (edac_op_state == EDAC_OPSTATE_POLL)
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return 0;
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return atomic_read(&edac_handlers);
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}
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EXPORT_SYMBOL_GPL(edac_handler_set);
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/*
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* handler for NMI type of interrupts to assert error
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*/
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void edac_atomic_assert_error(void)
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{
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edac_err_assert++;
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}
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EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
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/*
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* sysfs object: /sys/devices/system/edac
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* need to export to other files
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*/
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struct bus_type edac_subsys = {
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.name = "edac",
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.dev_name = "edac",
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};
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EXPORT_SYMBOL_GPL(edac_subsys);
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/* return pointer to the 'edac' node in sysfs */
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struct bus_type *edac_get_sysfs_subsys(void)
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{
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int err = 0;
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if (atomic_read(&edac_subsys_valid))
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goto out;
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/* create the /sys/devices/system/edac directory */
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err = subsys_system_register(&edac_subsys, NULL);
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if (err) {
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printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
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return NULL;
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}
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out:
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atomic_inc(&edac_subsys_valid);
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return &edac_subsys;
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}
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EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
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void edac_put_sysfs_subsys(void)
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{
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/* last user unregisters it */
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if (atomic_dec_and_test(&edac_subsys_valid))
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bus_unregister(&edac_subsys);
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}
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EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);
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