1 /*-
2  * Copyright (c) 2010 Isilon Systems, Inc.
3  * Copyright (c) 2010 iX Systems, Inc.
4  * Copyright (c) 2010 Panasas, Inc.
5  * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice unmodified, this list of conditions, and the following
13  *    disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  *
29  * $FreeBSD$
30  */
31 #ifndef _LINUX_DMAPOOL_H_
32 #define	_LINUX_DMAPOOL_H_
33 
34 #include <linux/types.h>
35 #include <linux/io.h>
36 #include <linux/scatterlist.h>
37 #include <linux/device.h>
38 #include <linux/slab.h>
39 
40 struct dma_pool {
41 	uma_zone_t	pool_zone;
42 };
43 
44 static inline struct dma_pool *
45 dma_pool_create(char *name, struct device *dev, size_t size,
46     size_t align, size_t boundary)
47 {
48 	struct dma_pool *pool;
49 
50 	pool = kmalloc(sizeof(*pool), GFP_KERNEL);
51 	align--;
52 	/*
53 	 * XXX Eventually this could use a separate allocf to honor boundary
54 	 * and physical address requirements of the device.
55 	 */
56 	pool->pool_zone = uma_zcreate(name, size, NULL, NULL, NULL, NULL,
57 	    align, UMA_ZONE_OFFPAGE|UMA_ZONE_HASH);
58 
59 	return (pool);
60 }
61 
62 static inline void
63 dma_pool_destroy(struct dma_pool *pool)
64 {
65 	uma_zdestroy(pool->pool_zone);
66 	kfree(pool);
67 }
68 
69 static inline void *
70 dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle)
71 {
72 	void *vaddr;
73 
74 	vaddr = uma_zalloc(pool->pool_zone, mem_flags);
75 	if (vaddr)
76 		*handle = vtophys(vaddr);
77 	return (vaddr);
78 }
79 
80 static inline void
81 dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr)
82 {
83 	uma_zfree(pool->pool_zone, vaddr);
84 }
85 
86 
87 #endif /* _LINUX_DMAPOOL_H_ */
88