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 <borislav.petkov@amd.com>
   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 <asm/edac.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_class_valid = ATOMIC_INIT(0);
  30
  31 /*
  32  * called to determine if there is an EDAC driver interested in
  33  * knowing an event (such as NMI) occurred
  34  */
  35 int edac_handler_set(void)
  36 {
  37         if (edac_op_state == EDAC_OPSTATE_POLL)
  38                 return 0;
  39
  40         return atomic_read(&edac_handlers);
  41 }
  42 EXPORT_SYMBOL_GPL(edac_handler_set);
  43
  44 /*
  45  * handler for NMI type of interrupts to assert error
  46  */
  47 void edac_atomic_assert_error(void)
  48 {
  49         edac_err_assert++;
  50 }
  51 EXPORT_SYMBOL_GPL(edac_atomic_assert_error);
  52
  53 /*
  54  * sysfs object: /sys/devices/system/edac
  55  *      need to export to other files
  56  */
  57 struct sysdev_class edac_class = {
  58         .name = "edac",
  59 };
  60 EXPORT_SYMBOL_GPL(edac_class);
  61
  62 /* return pointer to the 'edac' node in sysfs */
  63 struct sysdev_class *edac_get_sysfs_class(void)
  64 {
  65         int err = 0;
  66
  67         if (atomic_read(&edac_class_valid))
  68                 goto out;
  69
  70         /* create the /sys/devices/system/edac directory */
  71         err = sysdev_class_register(&edac_class);
  72         if (err) {
  73                 printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
  74                 return NULL;
  75         }
  76
  77 out:
  78         atomic_inc(&edac_class_valid);
  79         return &edac_class;
  80 }
  81 EXPORT_SYMBOL_GPL(edac_get_sysfs_class);
  82
  83 void edac_put_sysfs_class(void)
  84 {
  85         /* last user unregisters it */
  86         if (atomic_dec_and_test(&edac_class_valid))
  87                 sysdev_class_unregister(&edac_class);
  88 }
  89 EXPORT_SYMBOL_GPL(edac_put_sysfs_class);