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c0d12172 DJ |
1 | /* |
2 | * common EDAC components that must be in kernel | |
3 | * | |
4 | * Author: Dave Jiang <djiang@mvista.com> | |
5 | * | |
30e1f7a8 BP |
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. | |
c0d12172 DJ |
13 | * |
14 | */ | |
15 | #include <linux/module.h> | |
16 | #include <linux/edac.h> | |
17 | #include <asm/atomic.h> | |
18 | #include <asm/edac.h> | |
19 | ||
20 | int edac_op_state = EDAC_OPSTATE_INVAL; | |
fb3fb206 | 21 | EXPORT_SYMBOL_GPL(edac_op_state); |
c0d12172 DJ |
22 | |
23 | atomic_t edac_handlers = ATOMIC_INIT(0); | |
fb3fb206 | 24 | EXPORT_SYMBOL_GPL(edac_handlers); |
c0d12172 | 25 | |
66ee2f94 | 26 | int edac_err_assert = 0; |
fb3fb206 | 27 | EXPORT_SYMBOL_GPL(edac_err_assert); |
c0d12172 | 28 | |
30e1f7a8 BP |
29 | static atomic_t edac_class_valid = ATOMIC_INIT(0); |
30 | ||
fb3fb206 DT |
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) | |
c0d12172 DJ |
36 | { |
37 | if (edac_op_state == EDAC_OPSTATE_POLL) | |
38 | return 0; | |
39 | ||
40 | return atomic_read(&edac_handlers); | |
41 | } | |
fb3fb206 | 42 | EXPORT_SYMBOL_GPL(edac_handler_set); |
c0d12172 DJ |
43 | |
44 | /* | |
45 | * handler for NMI type of interrupts to assert error | |
46 | */ | |
fb3fb206 | 47 | void edac_atomic_assert_error(void) |
c0d12172 | 48 | { |
66ee2f94 | 49 | edac_err_assert++; |
c0d12172 | 50 | } |
fb3fb206 | 51 | EXPORT_SYMBOL_GPL(edac_atomic_assert_error); |
30e1f7a8 BP |
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); |