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 HW_SYNC_TIMEOUT_MSECS		500
38 #define HW_SYNC_SLEEP_TIME_INTERVAL	20
39 #define BT_CMD_SYNC_SHIFT		31
40 
41 enum {
42 	/* MAP HEM(Hardware Entry Memory) */
43 	HEM_TYPE_QPC = 0,
44 	HEM_TYPE_MTPT,
45 	HEM_TYPE_CQC,
46 	HEM_TYPE_SRQC,
47 
48 	 /* UNMAP HEM */
49 	HEM_TYPE_MTT,
50 	HEM_TYPE_CQE,
51 	HEM_TYPE_SRQWQE,
52 	HEM_TYPE_IDX,
53 	HEM_TYPE_IRRL,
54 	HEM_TYPE_TRRL,
55 };
56 
57 #define HNS_ROCE_HEM_CHUNK_LEN	\
58 	 ((256 - sizeof(struct list_head) - 2 * sizeof(int)) /	 \
59 	 (sizeof(struct scatterlist)))
60 
61 #define check_whether_bt_num_3(type, hop_num) \
62 	(type < HEM_TYPE_MTT && hop_num == 2)
63 
64 #define check_whether_bt_num_2(type, hop_num) \
65 	((type < HEM_TYPE_MTT && hop_num == 1) || \
66 	(type >= HEM_TYPE_MTT && hop_num == 2))
67 
68 #define check_whether_bt_num_1(type, hop_num) \
69 	((type < HEM_TYPE_MTT && hop_num == HNS_ROCE_HOP_NUM_0) || \
70 	(type >= HEM_TYPE_MTT && hop_num == 1) || \
71 	(type >= HEM_TYPE_MTT && hop_num == HNS_ROCE_HOP_NUM_0))
72 
73 enum {
74 	 HNS_ROCE_HEM_PAGE_SHIFT = 12,
75 	 HNS_ROCE_HEM_PAGE_SIZE  = 1 << HNS_ROCE_HEM_PAGE_SHIFT,
76 };
77 
78 struct hns_roce_hem_chunk {
79 	struct list_head	 list;
80 	int			 npages;
81 	int			 nsg;
82 	struct scatterlist	 mem[HNS_ROCE_HEM_CHUNK_LEN];
83 	void			 *buf[HNS_ROCE_HEM_CHUNK_LEN];
84 };
85 
86 struct hns_roce_hem {
87 	struct list_head	 chunk_list;
88 	int			 refcount;
89 };
90 
91 struct hns_roce_hem_iter {
92 	struct hns_roce_hem		 *hem;
93 	struct hns_roce_hem_chunk	 *chunk;
94 	int				 page_idx;
95 };
96 
97 struct hns_roce_hem_mhop {
98 	u32	hop_num;
99 	u32	buf_chunk_size;
100 	u32	bt_chunk_size;
101 	u32	ba_l0_num;
102 	u32	l0_idx;/* level 0 base address table index */
103 	u32	l1_idx;/* level 1 base address table index */
104 	u32	l2_idx;/* level 2 base address table index */
105 };
106 
107 void hns_roce_free_hem(struct hns_roce_dev *hr_dev, struct hns_roce_hem *hem);
108 int hns_roce_table_get(struct hns_roce_dev *hr_dev,
109 		       struct hns_roce_hem_table *table, unsigned long obj);
110 void hns_roce_table_put(struct hns_roce_dev *hr_dev,
111 			struct hns_roce_hem_table *table, unsigned long obj);
112 void *hns_roce_table_find(struct hns_roce_dev *hr_dev,
113 			  struct hns_roce_hem_table *table, unsigned long obj,
114 			  dma_addr_t *dma_handle);
115 int hns_roce_table_get_range(struct hns_roce_dev *hr_dev,
116 			     struct hns_roce_hem_table *table,
117 			     unsigned long start, unsigned long end);
118 void hns_roce_table_put_range(struct hns_roce_dev *hr_dev,
119 			      struct hns_roce_hem_table *table,
120 			      unsigned long start, unsigned long end);
121 int hns_roce_init_hem_table(struct hns_roce_dev *hr_dev,
122 			    struct hns_roce_hem_table *table, u32 type,
123 			    unsigned long obj_size, unsigned long nobj,
124 			    int use_lowmem);
125 void hns_roce_cleanup_hem_table(struct hns_roce_dev *hr_dev,
126 				struct hns_roce_hem_table *table);
127 void hns_roce_cleanup_hem(struct hns_roce_dev *hr_dev);
128 int hns_roce_calc_hem_mhop(struct hns_roce_dev *hr_dev,
129 			   struct hns_roce_hem_table *table, unsigned long *obj,
130 			   struct hns_roce_hem_mhop *mhop);
131 bool hns_roce_check_whether_mhop(struct hns_roce_dev *hr_dev, u32 type);
132 
133 static inline void hns_roce_hem_first(struct hns_roce_hem *hem,
134 				      struct hns_roce_hem_iter *iter)
135 {
136 	iter->hem = hem;
137 	iter->chunk = list_empty(&hem->chunk_list) ? NULL :
138 				 list_entry(hem->chunk_list.next,
139 					    struct hns_roce_hem_chunk, list);
140 	iter->page_idx = 0;
141 }
142 
143 static inline int hns_roce_hem_last(struct hns_roce_hem_iter *iter)
144 {
145 	return !iter->chunk;
146 }
147 
148 static inline void hns_roce_hem_next(struct hns_roce_hem_iter *iter)
149 {
150 	if (++iter->page_idx >= iter->chunk->nsg) {
151 		if (iter->chunk->list.next == &iter->hem->chunk_list) {
152 			iter->chunk = NULL;
153 			return;
154 		}
155 
156 		iter->chunk = list_entry(iter->chunk->list.next,
157 					 struct hns_roce_hem_chunk, list);
158 		iter->page_idx = 0;
159 	}
160 }
161 
162 static inline dma_addr_t hns_roce_hem_addr(struct hns_roce_hem_iter *iter)
163 {
164 	return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
165 }
166 
167 #endif /*_HNS_ROCE_HEM_H*/
168