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