1 /*
2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34 
35 #ifndef MTHCA_MEMFREE_H
36 #define MTHCA_MEMFREE_H
37 
38 #include <linux/list.h>
39 #include <linux/mutex.h>
40 
41 #define MTHCA_ICM_CHUNK_LEN \
42 	((256 - sizeof (struct list_head) - 2 * sizeof (int)) /		\
43 	 (sizeof (struct scatterlist)))
44 
45 enum {
46 	MTHCA_ICM_PAGE_SHIFT	= 12,
47 	MTHCA_ICM_PAGE_SIZE	= 1 << MTHCA_ICM_PAGE_SHIFT,
48 	MTHCA_DB_REC_PER_PAGE	= MTHCA_ICM_PAGE_SIZE / 8
49 };
50 
51 struct mthca_icm_chunk {
52 	struct list_head   list;
53 	int                npages;
54 	int                nsg;
55 	struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
56 };
57 
58 struct mthca_icm {
59 	struct list_head chunk_list;
60 	int              refcount;
61 };
62 
63 struct mthca_icm_table {
64 	u64               virt;
65 	int               num_icm;
66 	int               num_obj;
67 	int               obj_size;
68 	int               lowmem;
69 	int               coherent;
70 	struct mutex      mutex;
71 	struct mthca_icm *icm[0];
72 };
73 
74 struct mthca_icm_iter {
75 	struct mthca_icm       *icm;
76 	struct mthca_icm_chunk *chunk;
77 	int                     page_idx;
78 };
79 
80 struct mthca_dev;
81 
82 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
83 				  gfp_t gfp_mask, int coherent);
84 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm, int coherent);
85 
86 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
87 					      u64 virt, int obj_size,
88 					      int nobj, int reserved,
89 					      int use_lowmem, int use_coherent);
90 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
91 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
92 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
93 void *mthca_table_find(struct mthca_icm_table *table, int obj, dma_addr_t *dma_handle);
94 int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
95 			  int start, int end);
96 void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
97 			   int start, int end);
98 
99 static inline void mthca_icm_first(struct mthca_icm *icm,
100 				   struct mthca_icm_iter *iter)
101 {
102 	iter->icm      = icm;
103 	iter->chunk    = list_empty(&icm->chunk_list) ?
104 		NULL : list_entry(icm->chunk_list.next,
105 				  struct mthca_icm_chunk, list);
106 	iter->page_idx = 0;
107 }
108 
109 static inline int mthca_icm_last(struct mthca_icm_iter *iter)
110 {
111 	return !iter->chunk;
112 }
113 
114 static inline void mthca_icm_next(struct mthca_icm_iter *iter)
115 {
116 	if (++iter->page_idx >= iter->chunk->nsg) {
117 		if (iter->chunk->list.next == &iter->icm->chunk_list) {
118 			iter->chunk = NULL;
119 			return;
120 		}
121 
122 		iter->chunk = list_entry(iter->chunk->list.next,
123 					 struct mthca_icm_chunk, list);
124 		iter->page_idx = 0;
125 	}
126 }
127 
128 static inline dma_addr_t mthca_icm_addr(struct mthca_icm_iter *iter)
129 {
130 	return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
131 }
132 
133 static inline unsigned long mthca_icm_size(struct mthca_icm_iter *iter)
134 {
135 	return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
136 }
137 
138 struct mthca_db_page {
139 	DECLARE_BITMAP(used, MTHCA_DB_REC_PER_PAGE);
140 	__be64    *db_rec;
141 	dma_addr_t mapping;
142 };
143 
144 struct mthca_db_table {
145 	int 	       	      npages;
146 	int 	       	      max_group1;
147 	int 	       	      min_group2;
148 	struct mthca_db_page *page;
149 	struct mutex          mutex;
150 };
151 
152 enum mthca_db_type {
153 	MTHCA_DB_TYPE_INVALID   = 0x0,
154 	MTHCA_DB_TYPE_CQ_SET_CI = 0x1,
155 	MTHCA_DB_TYPE_CQ_ARM    = 0x2,
156 	MTHCA_DB_TYPE_SQ        = 0x3,
157 	MTHCA_DB_TYPE_RQ        = 0x4,
158 	MTHCA_DB_TYPE_SRQ       = 0x5,
159 	MTHCA_DB_TYPE_GROUP_SEP = 0x7
160 };
161 
162 struct mthca_user_db_table;
163 struct mthca_uar;
164 
165 int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
166 		      struct mthca_user_db_table *db_tab, int index, u64 uaddr);
167 void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
168 			 struct mthca_user_db_table *db_tab, int index);
169 struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev);
170 void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
171 			       struct mthca_user_db_table *db_tab);
172 
173 int mthca_init_db_tab(struct mthca_dev *dev);
174 void mthca_cleanup_db_tab(struct mthca_dev *dev);
175 int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
176 		   u32 qn, __be32 **db);
177 void mthca_free_db(struct mthca_dev *dev, int type, int db_index);
178 
179 #endif /* MTHCA_MEMFREE_H */
180