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 32c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gongint edac_report_status = EDAC_REPORTING_ENABLED; 33c700f013adb0ec57518a7fe0163e3117659ce249Chen, GongEXPORT_SYMBOL_GPL(edac_report_status); 34c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong 35c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gongstatic int __init edac_report_setup(char *str) 36c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong{ 37c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong if (!str) 38c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong return -EINVAL; 39c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong 40c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong if (!strncmp(str, "on", 2)) 41c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong set_edac_report_status(EDAC_REPORTING_ENABLED); 42c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong else if (!strncmp(str, "off", 3)) 43c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong set_edac_report_status(EDAC_REPORTING_DISABLED); 44c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong else if (!strncmp(str, "force", 5)) 45c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong set_edac_report_status(EDAC_REPORTING_FORCE); 46c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong 47c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong return 0; 48c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong} 49c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong__setup("edac_report=", edac_report_setup); 50c700f013adb0ec57518a7fe0163e3117659ce249Chen, Gong 51fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson/* 52fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson * called to determine if there is an EDAC driver interested in 53fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson * knowing an event (such as NMI) occurred 54fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompson */ 55fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompsonint edac_handler_set(void) 56c0d121720220584bba2876b032e58a076b843fa1Dave Jiang{ 57c0d121720220584bba2876b032e58a076b843fa1Dave Jiang if (edac_op_state == EDAC_OPSTATE_POLL) 58c0d121720220584bba2876b032e58a076b843fa1Dave Jiang return 0; 59c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 60c0d121720220584bba2876b032e58a076b843fa1Dave Jiang return atomic_read(&edac_handlers); 61c0d121720220584bba2876b032e58a076b843fa1Dave Jiang} 62fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_handler_set); 63c0d121720220584bba2876b032e58a076b843fa1Dave Jiang 64c0d121720220584bba2876b032e58a076b843fa1Dave Jiang/* 65c0d121720220584bba2876b032e58a076b843fa1Dave Jiang * handler for NMI type of interrupts to assert error 66c0d121720220584bba2876b032e58a076b843fa1Dave Jiang */ 67fb3fb2068775a1363265edc00870aa5e2f0e3631Doug Thompsonvoid edac_atomic_assert_error(void) 68c0d121720220584bba2876b032e58a076b843fa1Dave Jiang{ 6966ee2f940ac8ab25f0c43a1e717d25dc46bfe74dDave Jiang edac_err_assert++; 70c0d121720220584bba2876b032e58a076b843fa1Dave Jiang} 71fb3fb2068775a1363265edc00870aa5e2f0e3631Doug ThompsonEXPORT_SYMBOL_GPL(edac_atomic_assert_error); 7230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 7330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov/* 7430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * sysfs object: /sys/devices/system/edac 7530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov * need to export to other files 7630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov */ 77fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sieversstruct bus_type edac_subsys = { 7830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov .name = "edac", 79fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers .dev_name = "edac", 8030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov}; 81fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay SieversEXPORT_SYMBOL_GPL(edac_subsys); 8230e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 8330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov/* return pointer to the 'edac' node in sysfs */ 84fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sieversstruct bus_type *edac_get_sysfs_subsys(void) 8530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov{ 8630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov int err = 0; 8730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 88fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers if (atomic_read(&edac_subsys_valid)) 8930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov goto out; 9030e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 9130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov /* create the /sys/devices/system/edac directory */ 92fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers err = subsys_system_register(&edac_subsys, NULL); 9330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov if (err) { 9430e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n"); 9530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov return NULL; 9630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov } 9730e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 9830e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkovout: 99fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers atomic_inc(&edac_subsys_valid); 100fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers return &edac_subsys; 10130e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov} 102fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay SieversEXPORT_SYMBOL_GPL(edac_get_sysfs_subsys); 10330e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov 104fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sieversvoid edac_put_sysfs_subsys(void) 10530e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov{ 10630e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov /* last user unregisters it */ 107fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers if (atomic_dec_and_test(&edac_subsys_valid)) 108fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay Sievers bus_unregister(&edac_subsys); 10930e1f7a8122145f44f45c95366e27b6bb0b08428Borislav Petkov} 110fe5ff8b84c8b03348a2f64ea9d884348faec2217Kay SieversEXPORT_SYMBOL_GPL(edac_put_sysfs_subsys); 111