1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * raid_class.h - a generic raid visualisation class
4 *
5 * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
6 */
7 #include <linux/transport_class.h>
8
9 struct raid_template {
10 struct transport_container raid_attrs;
11 };
12
13 struct raid_function_template {
14 const void *cookie;
15 int (*is_raid)(struct device *);
16 void (*get_resync)(struct device *);
17 void (*get_state)(struct device *);
18 };
19
20 enum raid_state {
21 RAID_STATE_UNKNOWN = 0,
22 RAID_STATE_ACTIVE,
23 RAID_STATE_DEGRADED,
24 RAID_STATE_RESYNCING,
25 RAID_STATE_OFFLINE,
26 };
27
28 enum raid_level {
29 RAID_LEVEL_UNKNOWN = 0,
30 RAID_LEVEL_LINEAR,
31 RAID_LEVEL_0,
32 RAID_LEVEL_1,
33 RAID_LEVEL_10,
34 RAID_LEVEL_1E,
35 RAID_LEVEL_3,
36 RAID_LEVEL_4,
37 RAID_LEVEL_5,
38 RAID_LEVEL_50,
39 RAID_LEVEL_6,
40 RAID_LEVEL_JBOD,
41 };
42
43 struct raid_data {
44 struct list_head component_list;
45 int component_count;
46 enum raid_level level;
47 enum raid_state state;
48 int resync;
49 };
50
51 /* resync complete goes from 0 to this */
52 #define RAID_MAX_RESYNC (10000)
53
54 #define DEFINE_RAID_ATTRIBUTE(type, attr) \
55 static inline void \
56 raid_set_##attr(struct raid_template *r, struct device *dev, type value) { \
57 struct device *device = \
58 attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
59 struct raid_data *rd; \
60 BUG_ON(!device); \
61 rd = dev_get_drvdata(device); \
62 rd->attr = value; \
63 } \
64 static inline type \
65 raid_get_##attr(struct raid_template *r, struct device *dev) { \
66 struct device *device = \
67 attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
68 struct raid_data *rd; \
69 BUG_ON(!device); \
70 rd = dev_get_drvdata(device); \
71 return rd->attr; \
72 }
73
74 DEFINE_RAID_ATTRIBUTE(enum raid_level, level)
75 DEFINE_RAID_ATTRIBUTE(int, resync)
76 DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
77
78 struct raid_template *raid_class_attach(struct raid_function_template *);
79 void raid_class_release(struct raid_template *);
80
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