edac_stub.c revision 43aff26ce1684dae4bf75437b2733371106aa767
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. 843aff26ce1684dae4bf75437b2733371106aa767Borislav Petkov * Borislav Petkov <bp@alien8.de> 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> 1760063497a95e716c9a689af3be2687d261f115b4Arun Sharma#include <linux/atomic.h> 1851990e825431089747f8896244b5c17d3a6423f1Paul Gortmaker#include <linux/device.h> 19c0d121720220584bba2876b032e58a076b843fa1Dave Jiang#include <asm/edac.h> 20c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 21c0d121720220584bba2876b032e58a076b843fa1Dave Jiangint edac_op_state = EDAC_OPSTATE_INVAL; 22fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_op_state); 23c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 24c0d121720220584bba2876b032e58a076b843fa1Dave Jiangatomic_t edac_handlers = ATOMIC_INIT(0); 25fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_handlers); 26c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 2766ee2f940ac8ab25f0c43a1e717d25dc46bfe74dDave Jiangint edac_err_assert = 0; 28fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_err_assert); 29c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 30fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sieversstatic atomic_t edac_subsys_valid = ATOMIC_INIT(0); 3130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 32fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson/* 33fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson * called to determine if there is an EDAC driver interested in 34fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson * knowing an event (such as NMI) occurred 35fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson */ 36fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompsonint edac_handler_set(void) 37c0d121720220584bba2876b032e58a076b843fa1Dave Jiang{ 38c0d121720220584bba2876b032e58a076b843fa1Dave Jiang if (edac_op_state == EDAC_OPSTATE_POLL) 39c0d121720220584bba2876b032e58a076b843fa1Dave Jiang return 0; 40c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 41c0d121720220584bba2876b032e58a076b843fa1Dave Jiang return atomic_read(&edac_handlers); 42c0d121720220584bba2876b032e58a076b843fa1Dave Jiang} 43fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_handler_set); 44c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 45c0d121720220584bba2876b032e58a076b843fa1Dave Jiang/* 46c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * handler for NMI type of interrupts to assert error 47c0d121720220584bba2876b032e58a076b843fa1Dave Jiang */ 48fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompsonvoid edac_atomic_assert_error(void) 49c0d121720220584bba2876b032e58a076b843fa1Dave Jiang{ 5066ee2f940ac8ab25f0c43a1e717d25dc46bfe74dDave Jiang edac_err_assert++; 51c0d121720220584bba2876b032e58a076b843fa1Dave Jiang} 52fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_atomic_assert_error); 5330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 5430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov/* 5530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * sysfs object: /sys/devices/system/edac 5630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * need to export to other files 5730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov */ 58fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sieversstruct bus_type edac_subsys = { 5930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov .name = "edac", 60fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers .dev_name = "edac", 6130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov}; 62fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay SieversEXPORT_SYMBOL_GPL(edac_subsys); 6330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 6430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov/* return pointer to the 'edac' node in sysfs */ 65fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sieversstruct bus_type *edac_get_sysfs_subsys(void) 6630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov{ 6730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov int err = 0; 6830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 69fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers if (atomic_read(&edac_subsys_valid)) 7030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov goto out; 7130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 7230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov /* create the /sys/devices/system/edac directory */ 73fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers err = subsys_system_register(&edac_subsys, NULL); 7430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov if (err) { 7530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n"); 7630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov return NULL; 7730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov } 7830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 7930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkovout: 80fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers atomic_inc(&edac_subsys_valid); 81fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers return &edac_subsys; 8230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov} 83fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay SieversEXPORT_SYMBOL_GPL(edac_get_sysfs_subsys); 8430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 85fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sieversvoid edac_put_sysfs_subsys(void) 8630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov{ 8730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov /* last user unregisters it */ 88fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers if (atomic_dec_and_test(&edac_subsys_valid)) 89fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers bus_unregister(&edac_subsys); 9030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov} 91fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay SieversEXPORT_SYMBOL_GPL(edac_put_sysfs_subsys); 92