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