edac_stub.c revision 30e1f7a8122145f44f45c95366e27b6bb0b08428
1c0d121720220584bba2876b032e58a076b843fa1Dave Jiang/* 2c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * common EDAC components that must be in kernel 3c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * 4c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * Author: Dave Jiang <djiang@mvista.com> 5c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * 630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * 2007 (c) MontaVista Software, Inc. 730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * 2010 (c) Advanced Micro Devices Inc. 830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * Borislav Petkov <borislav.petkov@amd.com> 930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * 1030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * This file is licensed under the terms of the GNU General Public 1130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * License version 2. This program is licensed "as is" without any 1230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * warranty of any kind, whether express or implied. 13c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * 14c0d121720220584bba2876b032e58a076b843fa1Dave Jiang */ 15c0d121720220584bba2876b032e58a076b843fa1Dave Jiang#include <linux/module.h> 16c0d121720220584bba2876b032e58a076b843fa1Dave Jiang#include <linux/edac.h> 17c0d121720220584bba2876b032e58a076b843fa1Dave Jiang#include <asm/atomic.h> 18c0d121720220584bba2876b032e58a076b843fa1Dave Jiang#include <asm/edac.h> 19c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 20c0d121720220584bba2876b032e58a076b843fa1Dave Jiangint edac_op_state = EDAC_OPSTATE_INVAL; 21fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_op_state); 22c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 23c0d121720220584bba2876b032e58a076b843fa1Dave Jiangatomic_t edac_handlers = ATOMIC_INIT(0); 24fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_handlers); 25c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 2666ee2f940ac8ab25f0c43a1e717d25dc46bfe74dDave Jiangint edac_err_assert = 0; 27fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_err_assert); 28c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 2930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkovstatic atomic_t edac_class_valid = ATOMIC_INIT(0); 3030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 31fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson/* 32fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson * called to determine if there is an EDAC driver interested in 33fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson * knowing an event (such as NMI) occurred 34fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson */ 35fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompsonint edac_handler_set(void) 36c0d121720220584bba2876b032e58a076b843fa1Dave Jiang{ 37c0d121720220584bba2876b032e58a076b843fa1Dave Jiang if (edac_op_state == EDAC_OPSTATE_POLL) 38c0d121720220584bba2876b032e58a076b843fa1Dave Jiang return 0; 39c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 40c0d121720220584bba2876b032e58a076b843fa1Dave Jiang return atomic_read(&edac_handlers); 41c0d121720220584bba2876b032e58a076b843fa1Dave Jiang} 42fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_handler_set); 43c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 44c0d121720220584bba2876b032e58a076b843fa1Dave Jiang/* 45c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * handler for NMI type of interrupts to assert error 46c0d121720220584bba2876b032e58a076b843fa1Dave Jiang */ 47fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompsonvoid edac_atomic_assert_error(void) 48c0d121720220584bba2876b032e58a076b843fa1Dave Jiang{ 4966ee2f940ac8ab25f0c43a1e717d25dc46bfe74dDave Jiang edac_err_assert++; 50c0d121720220584bba2876b032e58a076b843fa1Dave Jiang} 51fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_atomic_assert_error); 5230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 5330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov/* 5430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * sysfs object: /sys/devices/system/edac 5530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * need to export to other files 5630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov */ 5730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkovstruct sysdev_class edac_class = { 5830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov .name = "edac", 5930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov}; 6030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav PetkovEXPORT_SYMBOL_GPL(edac_class); 6130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 6230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov/* return pointer to the 'edac' node in sysfs */ 6330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkovstruct sysdev_class *edac_get_sysfs_class(void) 6430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov{ 6530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov int err = 0; 6630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 6730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov if (atomic_read(&edac_class_valid)) 6830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov goto out; 6930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 7030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov /* create the /sys/devices/system/edac directory */ 7130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov err = sysdev_class_register(&edac_class); 7230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov if (err) { 7330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n"); 7430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov return NULL; 7530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov } 7630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 7730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkovout: 7830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov atomic_inc(&edac_class_valid); 7930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov return &edac_class; 8030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov} 8130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav PetkovEXPORT_SYMBOL_GPL(edac_get_sysfs_class); 8230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 8330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkovvoid edac_put_sysfs_class(void) 8430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov{ 8530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov /* last user unregisters it */ 8630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov if (atomic_dec_and_test(&edac_class_valid)) 8730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov sysdev_class_unregister(&edac_class); 8830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov} 8930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav PetkovEXPORT_SYMBOL_GPL(edac_put_sysfs_class); 90