dmapool.h revision 270710 
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
30#ifndef _LINUX_DMAPOOL_H_
31#define	_LINUX_DMAPOOL_H_
32
33#include <linux/types.h>
34#include <linux/io.h>
35#include <linux/scatterlist.h>
36#include <linux/device.h>
37#include <linux/slab.h>
38
39struct dma_pool {
40	uma_zone_t	pool_zone;
41};
42
43static inline struct dma_pool *
44dma_pool_create(char *name, struct device *dev, size_t size,
45    size_t align, size_t boundary)
46{
47	struct dma_pool *pool;
48
49	pool = kmalloc(sizeof(*pool), GFP_KERNEL);
50	align--;
51	/*
52	 * XXX Eventually this could use a seperate allocf to honor boundary
53	 * and physical address requirements of the device.
54	 */
55	pool->pool_zone = uma_zcreate(name, size, NULL, NULL, NULL, NULL,
56	    align, UMA_ZONE_OFFPAGE|UMA_ZONE_HASH);
57
58	return (pool);
59}
60
61static inline void
62dma_pool_destroy(struct dma_pool *pool)
63{
64	uma_zdestroy(pool->pool_zone);
65	kfree(pool);
66}
67
68static inline void *
69dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle)
70{
71	void *vaddr;
72
73	vaddr = uma_zalloc(pool->pool_zone, mem_flags);
74	if (vaddr)
75		*handle = vtophys(vaddr);
76	return (vaddr);
77}
78
79static inline void
80dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr)
81{
82	uma_zfree(pool->pool_zone, vaddr);
83}
84
85
86#endif /* _LINUX_DMAPOOL_H_ */
87