drivers/edac/edac_stub.c

   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
  20 int edac_op_state = EDAC_OPSTATE_INVAL;
  21 EXPORT_SYMBOL_GPL(edac_op_state);
  22
  23 atomic_t edac_handlers = ATOMIC_INIT(0);
  24 EXPORT_SYMBOL_GPL(edac_handlers);
  25
  26 int edac_err_assert = 0;
  27 EXPORT_SYMBOL_GPL(edac_err_assert);
  28
  29 static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
  30
  31 int edac_report_status = EDAC_REPORTING_ENABLED;
  32 EXPORT_SYMBOL_GPL(edac_report_status);
  33
  34 static int __init edac_report_setup(char *str)
  35 {
  36         if (!str)
  37                 return -EINVAL;
  38
  39         if (!strncmp(str, "on", 2))
  40                 set_edac_report_status(EDAC_REPORTING_ENABLED);
  41         else if (!strncmp(str, "off", 3))
  42                 set_edac_report_status(EDAC_REPORTING_DISABLED);
  43         else if (!strncmp(str, "force", 5))
  44                 set_edac_report_status(EDAC_REPORTING_FORCE);
  45
  46         return 0;
  47 }
  48 __setup("edac_report=", edac_report_setup);
  49
  50 /*
  51  * called to determine if there is an EDAC driver interested in
  52  * knowing an event (such as NMI) occurred
  53  */
  54 int edac_handler_set(void)
  55 {
  56         if (edac_op_state == EDAC_OPSTATE_POLL)
  57                 return 0;
  58
  59         return atomic_read(&edac_handlers);
  60 }
  61 EXPORT_SYMBOL_GPL(edac_handler_set);
  62
  63 /*
  64  * handler for NMI type of interrupts to assert error
  65  */
  66 void edac_atomic_assert_error(void)
  67 {
  68         edac_err_assert++;
  69 }
  70 EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
  71
  72 /*
  73  * sysfs object: /sys/devices/system/edac
  74  *      need to export to other files
  75  */
  76 struct bus_type edac_subsys = {
  77         .name = "edac",
  78         .dev_name = "edac",
  79 };
  80 EXPORT_SYMBOL_GPL(edac_subsys);
  81
  82 /* return pointer to the 'edac' node in sysfs */
  83 struct bus_type *edac_get_sysfs_subsys(void)
  84 {
  85         int err = 0;
  86
  87         if (atomic_read(&edac_subsys_valid))
  88                 goto out;
  89
  90         /* create the /sys/devices/system/edac directory */
  91         err = subsys_system_register(&edac_subsys, NULL);
  92         if (err) {
  93                 printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
  94                 return NULL;
  95         }
  96
  97 out:
  98         atomic_inc(&edac_subsys_valid);
  99         return &edac_subsys;
 100 }
 101 EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
 102
 103 void edac_put_sysfs_subsys(void)
 104 {
 105         /* last user unregisters it */
 106         if (atomic_dec_and_test(&edac_subsys_valid))
 107                 bus_unregister(&edac_subsys);
 108 }
 109 EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);