1/*-
2 * Copyright (c) 2003, 2004 Silicon Graphics International Corp.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions, and the following disclaimer,
10 *    without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 *    substantially similar to the "NO WARRANTY" disclaimer below
13 *    ("Disclaimer") and any redistribution must be conditioned upon
14 *    including a substantially similar Disclaimer requirement for further
15 *    binary redistribution.
16 *
17 * NO WARRANTY
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGES.
29 *
30 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_mem_pool.h#1 $
31 * $FreeBSD$
32 */
33/*
34 * CAM Target Layer memory pool code.
35 *
36 * Author: Ken Merry <ken@FreeBSD.org>
37 */
38
39#ifndef	_CTL_MEMPOOL_H_
40#define	_CTL_MEMPOOL_H_
41
42typedef enum {
43	CTL_MEM_POOL_NONE,
44	CTL_MEM_POOL_PERM_GROW
45} ctl_mem_pool_flags;
46
47struct ctl_mem_pool {
48	ctl_mem_pool_flags flags;
49	int chunk_size;
50	int grow_inc;
51	struct mtx lock;
52        struct cv wait_mem;
53	STAILQ_HEAD(, ctl_mem_element) free_mem_list;
54};
55
56typedef enum {
57	CTL_MEM_ELEMENT_NONE,
58	CTL_MEM_ELEMENT_PREALLOC
59} ctl_mem_element_flags;
60
61struct ctl_mem_element {
62	ctl_mem_element_flags flags;
63	struct ctl_mem_pool *pool;
64	uint8_t *bytes;
65	STAILQ_ENTRY(ctl_mem_element) links;
66};
67
68#ifdef	_KERNEL
69
70MALLOC_DECLARE(M_CTL_POOL);
71
72int ctl_init_mem_pool(struct ctl_mem_pool *pool, int chunk_size,
73		      ctl_mem_pool_flags flags, int grow_inc,
74		      int initial_pool_size);
75struct ctl_mem_element *ctl_alloc_mem_element(struct ctl_mem_pool *pool,
76					      int can_wait);
77void ctl_free_mem_element(struct ctl_mem_element *mem);
78int ctl_grow_mem_pool(struct ctl_mem_pool *pool, int count,
79		      int can_wait);
80int ctl_shrink_mem_pool(struct ctl_mem_pool *pool);
81#endif	/* _KERNEL */
82
83#endif	/* _CTL_MEMPOOL_H_ */
84