1 /*
2  * Copyright (c) 2016 Hisilicon Limited.
3  * Copyright (c) 2007, 2008 Mellanox Technologies. 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 _HNS_ROCE_HEM_H
35 #define _HNS_ROCE_HEM_H
36 
37 #define HEM_HOP_STEP_DIRECT 0xff
38 
39 enum {
40 	/* MAP HEM(Hardware Entry Memory) */
41 	HEM_TYPE_QPC = 0,
42 	HEM_TYPE_MTPT,
43 	HEM_TYPE_CQC,
44 	HEM_TYPE_SRQC,
45 	HEM_TYPE_SCCC,
46 	HEM_TYPE_QPC_TIMER,
47 	HEM_TYPE_CQC_TIMER,
48 	HEM_TYPE_GMV,
49 
50 	 /* UNMAP HEM */
51 	HEM_TYPE_MTT,
52 	HEM_TYPE_CQE,
53 	HEM_TYPE_SRQWQE,
54 	HEM_TYPE_IDX,
55 	HEM_TYPE_IRRL,
56 	HEM_TYPE_TRRL,
57 };
58 
59 #define HNS_ROCE_HEM_CHUNK_LEN	\
60 	 ((256 - sizeof(struct list_head) - 2 * sizeof(int)) /	 \
61 	 (sizeof(struct scatterlist) + sizeof(void *)))
62 
63 #define check_whether_bt_num_3(type, hop_num) \
64 	(type < HEM_TYPE_MTT && hop_num == 2)
65 
66 #define check_whether_bt_num_2(type, hop_num) \
67 	((type < HEM_TYPE_MTT && hop_num == 1) || \
68 	(type >= HEM_TYPE_MTT && hop_num == 2))
69 
70 #define check_whether_bt_num_1(type, hop_num) \
71 	((type < HEM_TYPE_MTT && hop_num == HNS_ROCE_HOP_NUM_0) || \
72 	(type >= HEM_TYPE_MTT && hop_num == 1) || \
73 	(type >= HEM_TYPE_MTT && hop_num == HNS_ROCE_HOP_NUM_0))
74 
75 struct hns_roce_hem_chunk {
76 	struct list_head	 list;
77 	int			 npages;
78 	int			 nsg;
79 	struct scatterlist	 mem[HNS_ROCE_HEM_CHUNK_LEN];
80 	void			 *buf[HNS_ROCE_HEM_CHUNK_LEN];
81 };
82 
83 struct hns_roce_hem {
84 	struct list_head chunk_list;
85 	refcount_t refcount;
86 };
87 
88 struct hns_roce_hem_iter {
89 	struct hns_roce_hem		 *hem;
90 	struct hns_roce_hem_chunk	 *chunk;
91 	int				 page_idx;
92 };
93 
94 struct hns_roce_hem_mhop {
95 	u32	hop_num;
96 	u32	buf_chunk_size;
97 	u32	bt_chunk_size;
98 	u32	ba_l0_num;
99 	u32	l0_idx; /* level 0 base address table index */
100 	u32	l1_idx; /* level 1 base address table index */
101 	u32	l2_idx; /* level 2 base address table index */
102 };
103 
104 void hns_roce_free_hem(struct hns_roce_dev *hr_dev, struct hns_roce_hem *hem);
105 int hns_roce_table_get(struct hns_roce_dev *hr_dev,
106 		       struct hns_roce_hem_table *table, unsigned long obj);
107 void hns_roce_table_put(struct hns_roce_dev *hr_dev,
108 			struct hns_roce_hem_table *table, unsigned long obj);
109 void *hns_roce_table_find(struct hns_roce_dev *hr_dev,
110 			  struct hns_roce_hem_table *table, unsigned long obj,
111 			  dma_addr_t *dma_handle);
112 int hns_roce_init_hem_table(struct hns_roce_dev *hr_dev,
113 			    struct hns_roce_hem_table *table, u32 type,
114 			    unsigned long obj_size, unsigned long nobj,
115 			    int use_lowmem);
116 void hns_roce_cleanup_hem_table(struct hns_roce_dev *hr_dev,
117 				struct hns_roce_hem_table *table);
118 void hns_roce_cleanup_hem(struct hns_roce_dev *hr_dev);
119 int hns_roce_calc_hem_mhop(struct hns_roce_dev *hr_dev,
120 			   struct hns_roce_hem_table *table, unsigned long *obj,
121 			   struct hns_roce_hem_mhop *mhop);
122 bool hns_roce_check_whether_mhop(struct hns_roce_dev *hr_dev, u32 type);
123 
124 void hns_roce_hem_list_init(struct hns_roce_hem_list *hem_list);
125 int hns_roce_hem_list_calc_root_ba(const struct hns_roce_buf_region *regions,
126 				   int region_cnt, int unit);
127 int hns_roce_hem_list_request(struct hns_roce_dev *hr_dev,
128 			      struct hns_roce_hem_list *hem_list,
129 			      const struct hns_roce_buf_region *regions,
130 			      int region_cnt, unsigned int bt_pg_shift);
131 void hns_roce_hem_list_release(struct hns_roce_dev *hr_dev,
132 			       struct hns_roce_hem_list *hem_list);
133 void *hns_roce_hem_list_find_mtt(struct hns_roce_dev *hr_dev,
134 				 struct hns_roce_hem_list *hem_list,
135 				 int offset, int *mtt_cnt, u64 *phy_addr);
136 
137 static inline void hns_roce_hem_first(struct hns_roce_hem *hem,
138 				      struct hns_roce_hem_iter *iter)
139 {
140 	iter->hem = hem;
141 	iter->chunk = list_empty(&hem->chunk_list) ? NULL :
142 				 list_entry(hem->chunk_list.next,
143 					    struct hns_roce_hem_chunk, list);
144 	iter->page_idx = 0;
145 }
146 
147 static inline int hns_roce_hem_last(struct hns_roce_hem_iter *iter)
148 {
149 	return !iter->chunk;
150 }
151 
152 static inline void hns_roce_hem_next(struct hns_roce_hem_iter *iter)
153 {
154 	if (++iter->page_idx >= iter->chunk->nsg) {
155 		if (iter->chunk->list.next == &iter->hem->chunk_list) {
156 			iter->chunk = NULL;
157 			return;
158 		}
159 
160 		iter->chunk = list_entry(iter->chunk->list.next,
161 					 struct hns_roce_hem_chunk, list);
162 		iter->page_idx = 0;
163 	}
164 }
165 
166 static inline dma_addr_t hns_roce_hem_addr(struct hns_roce_hem_iter *iter)
167 {
168 	return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
169 }
170 
171 #endif /* _HNS_ROCE_HEM_H */
172