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 	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 
81 int __must_check raid_component_add(struct raid_template *, struct device *,
82 				    struct device *);
83 
84