1 /* 2 * common EDAC components that must be in kernel 3 * 4 * Author: Dave Jiang <djiang@mvista.com> 5 * 6 * 2007 (c) MontaVista Software, Inc. 7 * 2010 (c) Advanced Micro Devices Inc. 8 * Borislav Petkov <bp@alien8.de> 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. 13 * 14 */ 15 #include <linux/module.h> 16 #include <linux/edac.h> 17 #include <linux/atomic.h> 18 #include <linux/device.h> 19 #include <asm/edac.h> 20 21 int edac_op_state = EDAC_OPSTATE_INVAL; 22 EXPORT_SYMBOL_GPL(edac_op_state); 23 24 atomic_t edac_handlers = ATOMIC_INIT(0); 25 EXPORT_SYMBOL_GPL(edac_handlers); 26 27 int edac_err_assert = 0; 28 EXPORT_SYMBOL_GPL(edac_err_assert); 29 30 static atomic_t edac_subsys_valid = ATOMIC_INIT(0); 31 32 /* 33 * called to determine if there is an EDAC driver interested in 34 * knowing an event (such as NMI) occurred 35 */ edac_handler_set(void)36int edac_handler_set(void) 37 { 38 if (edac_op_state == EDAC_OPSTATE_POLL) 39 return 0; 40 41 return atomic_read(&edac_handlers); 42 } 43 EXPORT_SYMBOL_GPL(edac_handler_set); 44 45 /* 46 * handler for NMI type of interrupts to assert error 47 */ edac_atomic_assert_error(void)48void edac_atomic_assert_error(void) 49 { 50 edac_err_assert++; 51 } 52 EXPORT_SYMBOL_GPL(edac_atomic_assert_error); 53 54 /* 55 * sysfs object: /sys/devices/system/edac 56 * need to export to other files 57 */ 58 struct bus_type edac_subsys = { 59 .name = "edac", 60 .dev_name = "edac", 61 }; 62 EXPORT_SYMBOL_GPL(edac_subsys); 63 64 /* return pointer to the 'edac' node in sysfs */ edac_get_sysfs_subsys(void)65struct bus_type *edac_get_sysfs_subsys(void) 66 { 67 int err = 0; 68 69 if (atomic_read(&edac_subsys_valid)) 70 goto out; 71 72 /* create the /sys/devices/system/edac directory */ 73 err = subsys_system_register(&edac_subsys, NULL); 74 if (err) { 75 printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n"); 76 return NULL; 77 } 78 79 out: 80 atomic_inc(&edac_subsys_valid); 81 return &edac_subsys; 82 } 83 EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys); 84 edac_put_sysfs_subsys(void)85void edac_put_sysfs_subsys(void) 86 { 87 /* last user unregisters it */ 88 if (atomic_dec_and_test(&edac_subsys_valid)) 89 bus_unregister(&edac_subsys); 90 } 91 EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys); 92