1/*
2 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses.  You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 *     Redistribution and use in source and binary forms, with or
12 *     without modification, are permitted provided that the following
13 *     conditions are met:
14 *
15 *      - Redistributions of source code must retain the above
16 *        copyright notice, this list of conditions and the following
17 *        disclaimer.
18 *
19 *      - Redistributions in binary form must reproduce the above
20 *        copyright notice, this list of conditions and the following
21 *        disclaimer in the documentation and/or other materials
22 *        provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#ifndef MLX4_ICM_H
35#define MLX4_ICM_H
36
37#include <linux/list.h>
38#include <linux/pci.h>
39#include <linux/mutex.h>
40
41#define MLX4_ICM_CHUNK_LEN						\
42	((256 - sizeof (struct list_head) - 2 * sizeof (int)) /		\
43	 (sizeof (struct scatterlist)))
44
45enum {
46	MLX4_ICM_PAGE_SHIFT	= 12,
47	MLX4_ICM_PAGE_SIZE	= 1 << MLX4_ICM_PAGE_SHIFT,
48};
49
50struct mlx4_icm_chunk {
51	struct list_head	list;
52	int			npages;
53	int			nsg;
54	struct scatterlist	mem[MLX4_ICM_CHUNK_LEN];
55};
56
57struct mlx4_icm {
58	struct list_head	chunk_list;
59	int			refcount;
60};
61
62struct mlx4_icm_iter {
63	struct mlx4_icm	       *icm;
64	struct mlx4_icm_chunk  *chunk;
65	int			page_idx;
66};
67
68struct mlx4_dev;
69
70struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
71				gfp_t gfp_mask, int coherent);
72void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);
73
74int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
75void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
76int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
77			 u32 start, u32 end);
78void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
79			  u32 start, u32 end);
80int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
81			u64 virt, int obj_size,	u32 nobj, int reserved,
82			int use_lowmem, int use_coherent);
83void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);
84void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);
85
86static inline void mlx4_icm_first(struct mlx4_icm *icm,
87				  struct mlx4_icm_iter *iter)
88{
89	iter->icm      = icm;
90	iter->chunk    = list_empty(&icm->chunk_list) ?
91		NULL : list_entry(icm->chunk_list.next,
92				  struct mlx4_icm_chunk, list);
93	iter->page_idx = 0;
94}
95
96static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)
97{
98	return !iter->chunk;
99}
100
101static inline void mlx4_icm_next(struct mlx4_icm_iter *iter)
102{
103	if (++iter->page_idx >= iter->chunk->nsg) {
104		if (iter->chunk->list.next == &iter->icm->chunk_list) {
105			iter->chunk = NULL;
106			return;
107		}
108
109		iter->chunk = list_entry(iter->chunk->list.next,
110					 struct mlx4_icm_chunk, list);
111		iter->page_idx = 0;
112	}
113}
114
115static inline dma_addr_t mlx4_icm_addr(struct mlx4_icm_iter *iter)
116{
117	return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
118}
119
120static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter)
121{
122	return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
123}
124
125
126#endif /* MLX4_ICM_H */
127