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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_buf {
51 void *addr;
52 size_t size;
53 dma_addr_t dma_addr;
54};
55
56struct mlx4_icm_chunk {
57 struct list_head list;
58 int npages;
59 int nsg;
60 bool coherent;
61 union {
62 struct scatterlist sg[MLX4_ICM_CHUNK_LEN];
63 struct mlx4_icm_buf buf[MLX4_ICM_CHUNK_LEN];
64 };
65};
66
67struct mlx4_icm {
68 struct list_head chunk_list;
69 int refcount;
70};
71
72struct mlx4_icm_iter {
73 struct mlx4_icm *icm;
74 struct mlx4_icm_chunk *chunk;
75 int page_idx;
76};
77
78struct mlx4_dev;
79
80struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
81 gfp_t gfp_mask, int coherent);
82void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);
83
84int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
85void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
86int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
87 u32 start, u32 end);
88void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
89 u32 start, u32 end);
90int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
91 u64 virt, int obj_size, u32 nobj, int reserved,
92 int use_lowmem, int use_coherent);
93void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);
94void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);
95
96static inline void mlx4_icm_first(struct mlx4_icm *icm,
97 struct mlx4_icm_iter *iter)
98{
99 iter->icm = icm;
100 iter->chunk = list_empty(&icm->chunk_list) ?
101 NULL : list_entry(icm->chunk_list.next,
102 struct mlx4_icm_chunk, list);
103 iter->page_idx = 0;
104}
105
106static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)
107{
108 return !iter->chunk;
109}
110
111static inline void mlx4_icm_next(struct mlx4_icm_iter *iter)
112{
113 if (++iter->page_idx >= iter->chunk->nsg) {
114 if (iter->chunk->list.next == &iter->icm->chunk_list) {
115 iter->chunk = NULL;
116 return;
117 }
118
119 iter->chunk = list_entry(iter->chunk->list.next,
120 struct mlx4_icm_chunk, list);
121 iter->page_idx = 0;
122 }
123}
124
125static inline dma_addr_t mlx4_icm_addr(struct mlx4_icm_iter *iter)
126{
127 if (iter->chunk->coherent)
128 return iter->chunk->buf[iter->page_idx].dma_addr;
129 else
130 return sg_dma_address(&iter->chunk->sg[iter->page_idx]);
131}
132
133static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter)
134{
135 if (iter->chunk->coherent)
136 return iter->chunk->buf[iter->page_idx].size;
137 else
138 return sg_dma_len(&iter->chunk->sg[iter->page_idx]);
139}
140
141int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm);
142int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev);
143
144#endif /* MLX4_ICM_H */