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 
45 enum {
46 	MLX4_ICM_PAGE_SHIFT	= 12,
47 	MLX4_ICM_PAGE_SIZE	= 1 << MLX4_ICM_PAGE_SHIFT,
48 };
49 
50 struct mlx4_icm_chunk {
51 	struct list_head	list;
52 	int			npages;
53 	int			nsg;
54 	struct scatterlist	mem[MLX4_ICM_CHUNK_LEN];
55 };
56 
57 struct mlx4_icm {
58 	struct list_head	chunk_list;
59 	int			refcount;
60 };
61 
62 struct mlx4_icm_iter {
63 	struct mlx4_icm	       *icm;
64 	struct mlx4_icm_chunk  *chunk;
65 	int			page_idx;
66 };
67 
68 struct mlx4_dev;
69 
70 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
71 				gfp_t gfp_mask, int coherent);
72 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);
73 
74 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
75 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
76 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
77 			 u32 start, u32 end);
78 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
79 			  u32 start, u32 end);
80 int 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);
83 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);
84 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);
85 
86 static 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 
96 static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)
97 {
98 	return !iter->chunk;
99 }
100 
101 static 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 
115 static 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 
120 static 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 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm);
126 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev);
127 
128 #endif /* MLX4_ICM_H */
129