aboutsummaryrefslogtreecommitdiff
path: root/include/linux/idr.h
blob: 871a213a8477eb5f1d7c6ad3318f6b796bac7106 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/*
 * include/linux/idr.h
 * 
 * 2002-10-18  written by Jim Houston jim.houston@ccur.com
 *	Copyright (C) 2002 by Concurrent Computer Corporation
 *	Distributed under the GNU GPL license version 2.
 *
 * Small id to pointer translation service avoiding fixed sized
 * tables.
 */

#ifndef __IDR_H__
#define __IDR_H__

#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/rcupdate.h>

/*
 * We want shallower trees and thus more bits covered at each layer.  8
 * bits gives us large enough first layer for most use cases and maximum
 * tree depth of 4.  Each idr_layer is slightly larger than 2k on 64bit and
 * 1k on 32bit.
 */
#define IDR_BITS 8
#define IDR_SIZE (1 << IDR_BITS)
#define IDR_MASK ((1 << IDR_BITS)-1)

struct idr_layer {
	int			prefix;	/* the ID prefix of this idr_layer */
	DECLARE_BITMAP(bitmap, IDR_SIZE); /* A zero bit means "space here" */
	struct idr_layer __rcu	*ary[1<<IDR_BITS];
	int			count;	/* When zero, we can release it */
	int			layer;	/* distance from leaf */
	struct rcu_head		rcu_head;
};

struct idr {
	struct idr_layer __rcu	*hint;	/* the last layer allocated from */
	struct idr_layer __rcu	*top;
	struct idr_layer	*id_free;
	int			layers;	/* only valid w/o concurrent changes */
	int			id_free_cnt;
	int			cur;	/* current pos for cyclic allocation */
	spinlock_t		lock;
};

#define IDR_INIT(name)							\
{									\
	.lock			= __SPIN_LOCK_UNLOCKED(name.lock),	\
}
#define DEFINE_IDR(name)	struct idr name = IDR_INIT(name)

/**
 * DOC: idr sync
 * idr synchronization (stolen from radix-tree.h)
 *
 * idr_find() is able to be called locklessly, using RCU. The caller must
 * ensure calls to this function are made within rcu_read_lock() regions.
 * Other readers (lock-free or otherwise) and modifications may be running
 * concurrently.
 *
 * It is still required that the caller manage the synchronization and
 * lifetimes of the items. So if RCU lock-free lookups are used, typically
 * this would mean that the items have their own locks, or are amenable to
 * lock-free access; and that the items are freed by RCU (or only freed after
 * having been deleted from the idr tree *and* a synchronize_rcu() grace
 * period).
 */

/*
 * This is what we export.
 */

void *idr_find_slowpath(struct idr *idp, int id);
void idr_preload(gfp_t gfp_mask);
int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t gfp_mask);
int idr_alloc_cyclic(struct idr *idr, void *ptr, int start, int end, gfp_t gfp_mask);
int idr_for_each(struct idr *idp,
		 int (*fn)(int id, void *p, void *data), void *data);
void *idr_get_next(struct idr *idp, int *nextid);
void *idr_replace(struct idr *idp, void *ptr, int id);
void idr_remove(struct idr *idp, int id);
void idr_free(struct idr *idp, int id);
void idr_destroy(struct idr *idp);
void idr_init(struct idr *idp);

/**
 * idr_preload_end - end preload section started with idr_preload()
 *
 * Each idr_preload() should be matched with an invocation of this
 * function.  See idr_preload() for details.
 */
static inline void idr_preload_end(void)
{
	preempt_enable();
}

/**
 * idr_find - return pointer for given id
 * @idr: idr handle
 * @id: lookup key
 *
 * Return the pointer given the id it has been registered with.  A %NULL
 * return indicates that @id is not valid or you passed %NULL in
 * idr_get_new().
 *
 * This function can be called under rcu_read_lock(), given that the leaf
 * pointers lifetimes are correctly managed.
 */
static inline void *idr_find(struct idr *idr, int id)
{
	struct idr_layer *hint = rcu_dereference_raw(idr->hint);

	if (hint && (id & ~IDR_MASK) == hint->prefix)
		return rcu_dereference_raw(hint->ary[id & IDR_MASK]);

	return idr_find_slowpath(idr, id);
}

/**
 * idr_for_each_entry - iterate over an idr's elements of a given type
 * @idp:     idr handle
 * @entry:   the type * to use as cursor
 * @id:      id entry's key
 *
 * @entry and @id do not need to be initialized before the loop, and
 * after normal terminatinon @entry is left with the value NULL.  This
 * is convenient for a "not found" value.
 */
#define idr_for_each_entry(idp, entry, id)			\
	for (id = 0; ((entry) = idr_get_next(idp, &(id))) != NULL; ++id)

/*
 * Don't use the following functions.  These exist only to suppress
 * deprecated warnings on EXPORT_SYMBOL()s.
 */
int __idr_pre_get(struct idr *idp, gfp_t gfp_mask);
int __idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id);
void __idr_remove_all(struct idr *idp);

/**
 * idr_pre_get - reserve resources for idr allocation
 * @idp:	idr handle
 * @gfp_mask:	memory allocation flags
 *
 * Part of old alloc interface.  This is going away.  Use
 * idr_preload[_end]() and idr_alloc() instead.
 */
static inline int __deprecated idr_pre_get(struct idr *idp, gfp_t gfp_mask)
{
	return __idr_pre_get(idp, gfp_mask);
}

/**
 * idr_get_new_above - allocate new idr entry above or equal to a start id
 * @idp: idr handle
 * @ptr: pointer you want associated with the id
 * @starting_id: id to start search at
 * @id: pointer to the allocated handle
 *
 * Part of old alloc interface.  This is going away.  Use
 * idr_preload[_end]() and idr_alloc() instead.
 */
static inline int __deprecated idr_get_new_above(struct idr *idp, void *ptr,
						 int starting_id, int *id)
{
	return __idr_get_new_above(idp, ptr, starting_id, id);
}

/**
 * idr_get_new - allocate new idr entry
 * @idp: idr handle
 * @ptr: pointer you want associated with the id
 * @id: pointer to the allocated handle
 *
 * Part of old alloc interface.  This is going away.  Use
 * idr_preload[_end]() and idr_alloc() instead.
 */
static inline int __deprecated idr_get_new(struct idr *idp, void *ptr, int *id)
{
	return __idr_get_new_above(idp, ptr, 0, id);
}

/**
 * idr_remove_all - remove all ids from the given idr tree
 * @idp: idr handle
 *
 * If you're trying to destroy @idp, calling idr_destroy() is enough.
 * This is going away.  Don't use.
 */
static inline void __deprecated idr_remove_all(struct idr *idp)
{
	__idr_remove_all(idp);
}

/*
 * IDA - IDR based id allocator, use when translation from id to
 * pointer isn't necessary.
 *
 * IDA_BITMAP_LONGS is calculated to be one less to accommodate
 * ida_bitmap->nr_busy so that the whole struct fits in 128 bytes.
 */
#define IDA_CHUNK_SIZE		128	/* 128 bytes per chunk */
#define IDA_BITMAP_LONGS	(IDA_CHUNK_SIZE / sizeof(long) - 1)
#define IDA_BITMAP_BITS 	(IDA_BITMAP_LONGS * sizeof(long) * 8)

struct ida_bitmap {
	long			nr_busy;
	unsigned long		bitmap[IDA_BITMAP_LONGS];
};

struct ida {
	struct idr		idr;
	struct ida_bitmap	*free_bitmap;
};

#define IDA_INIT(name)		{ .idr = IDR_INIT((name).idr), .free_bitmap = NULL, }
#define DEFINE_IDA(name)	struct ida name = IDA_INIT(name)

int ida_pre_get(struct ida *ida, gfp_t gfp_mask);
int ida_get_new_above(struct ida *ida, int starting_id, int *p_id);
void ida_remove(struct ida *ida, int id);
void ida_destroy(struct ida *ida);
void ida_init(struct ida *ida);

int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
		   gfp_t gfp_mask);
void ida_simple_remove(struct ida *ida, unsigned int id);

/**
 * ida_get_new - allocate new ID
 * @ida:	idr handle
 * @p_id:	pointer to the allocated handle
 *
 * Simple wrapper around ida_get_new_above() w/ @starting_id of zero.
 */
static inline int ida_get_new(struct ida *ida, int *p_id)
{
	return ida_get_new_above(ida, 0, p_id);
}

void __init idr_init_cache(void);

#endif /* __IDR_H__ */