1 /* 2 * edac_module.c 3 * 4 * (C) 2007 www.softwarebitmaker.com 5 * 6 * This file is licensed under the terms of the GNU General Public 7 * License version 2. This program is licensed "as is" without any 8 * warranty of any kind, whether express or implied. 9 * 10 * Author: Doug Thompson <dougthompson@xmission.com> 11 * 12 */ 13 #include <linux/edac.h> 14 15 #include "edac_core.h" 16 #include "edac_module.h" 17 18 #define EDAC_VERSION "Ver: 3.0.0" 19 20 #ifdef CONFIG_EDAC_DEBUG 21 22 static int edac_set_debug_level(const char *buf, struct kernel_param *kp) 23 { 24 unsigned long val; 25 int ret; 26 27 ret = kstrtoul(buf, 0, &val); 28 if (ret) 29 return ret; 30 31 if (val > 4) 32 return -EINVAL; 33 34 return param_set_int(buf, kp); 35 } 36 37 /* Values of 0 to 4 will generate output */ 38 int edac_debug_level = 2; 39 EXPORT_SYMBOL_GPL(edac_debug_level); 40 41 module_param_call(edac_debug_level, edac_set_debug_level, param_get_int, 42 &edac_debug_level, 0644); 43 MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2"); 44 #endif 45 46 /* scope is to module level only */ 47 struct workqueue_struct *edac_workqueue; 48 49 /* 50 * edac_op_state_to_string() 51 */ 52 char *edac_op_state_to_string(int opstate) 53 { 54 if (opstate == OP_RUNNING_POLL) 55 return "POLLED"; 56 else if (opstate == OP_RUNNING_INTERRUPT) 57 return "INTERRUPT"; 58 else if (opstate == OP_RUNNING_POLL_INTR) 59 return "POLL-INTR"; 60 else if (opstate == OP_ALLOC) 61 return "ALLOC"; 62 else if (opstate == OP_OFFLINE) 63 return "OFFLINE"; 64 65 return "UNKNOWN"; 66 } 67 68 /* 69 * edac_workqueue_setup 70 * initialize the edac work queue for polling operations 71 */ 72 static int edac_workqueue_setup(void) 73 { 74 edac_workqueue = create_singlethread_workqueue("edac-poller"); 75 if (edac_workqueue == NULL) 76 return -ENODEV; 77 else 78 return 0; 79 } 80 81 /* 82 * edac_workqueue_teardown 83 * teardown the edac workqueue 84 */ 85 static void edac_workqueue_teardown(void) 86 { 87 if (edac_workqueue) { 88 flush_workqueue(edac_workqueue); 89 destroy_workqueue(edac_workqueue); 90 edac_workqueue = NULL; 91 } 92 } 93 94 /* 95 * edac_init 96 * module initialization entry point 97 */ 98 static int __init edac_init(void) 99 { 100 int err = 0; 101 102 edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n"); 103 104 /* 105 * Harvest and clear any boot/initialization PCI parity errors 106 * 107 * FIXME: This only clears errors logged by devices present at time of 108 * module initialization. We should also do an initial clear 109 * of each newly hotplugged device. 110 */ 111 edac_pci_clear_parity_errors(); 112 113 err = edac_mc_sysfs_init(); 114 if (err) 115 goto err_sysfs; 116 117 edac_debugfs_init(); 118 119 err = edac_workqueue_setup(); 120 if (err) { 121 edac_printk(KERN_ERR, EDAC_MC, "Failure initializing workqueue\n"); 122 goto err_wq; 123 } 124 125 return 0; 126 127 err_wq: 128 edac_debugfs_exit(); 129 edac_mc_sysfs_exit(); 130 131 err_sysfs: 132 return err; 133 } 134 135 /* 136 * edac_exit() 137 * module exit/termination function 138 */ 139 static void __exit edac_exit(void) 140 { 141 edac_dbg(0, "\n"); 142 143 /* tear down the various subsystems */ 144 edac_workqueue_teardown(); 145 edac_mc_sysfs_exit(); 146 edac_debugfs_exit(); 147 } 148 149 /* 150 * Inform the kernel of our entry and exit points 151 */ 152 subsys_initcall(edac_init); 153 module_exit(edac_exit); 154 155 MODULE_LICENSE("GPL"); 156 MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al"); 157 MODULE_DESCRIPTION("Core library routines for EDAC reporting"); 158