1 /*
2 * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
3 * Copyright (c) 2005 Open Grid Computing, 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 #include "c2.h"
34 #include "c2_mq.h"
35
36 void *c2_mq_alloc(struct c2_mq *q)
37 {
38 BUG_ON(q->magic != C2_MQ_MAGIC);
39 BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);
40
41 if (c2_mq_full(q)) {
42 return NULL;
43 } else {
44 #ifdef DEBUG
45 struct c2wr_hdr *m =
46 (struct c2wr_hdr *) (q->msg_pool.host + q->priv * q->msg_size);
47 #ifdef CCMSGMAGIC
48 BUG_ON(m->magic != be32_to_cpu(~CCWR_MAGIC));
49 m->magic = cpu_to_be32(CCWR_MAGIC);
50 #endif
51 return m;
52 #else
53 return q->msg_pool.host + q->priv * q->msg_size;
54 #endif
55 }
56 }
57
58 void c2_mq_produce(struct c2_mq *q)
59 {
60 BUG_ON(q->magic != C2_MQ_MAGIC);
61 BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);
62
63 if (!c2_mq_full(q)) {
64 q->priv = (q->priv + 1) % q->q_size;
65 q->hint_count++;
66 /* Update peer's offset. */
67 __raw_writew((__force u16) cpu_to_be16(q->priv), &q->peer->shared);
68 }
69 }
70
71 void *c2_mq_consume(struct c2_mq *q)
72 {
73 BUG_ON(q->magic != C2_MQ_MAGIC);
74 BUG_ON(q->type != C2_MQ_HOST_TARGET);
75
76 if (c2_mq_empty(q)) {
77 return NULL;
78 } else {
79 #ifdef DEBUG
80 struct c2wr_hdr *m = (struct c2wr_hdr *)
81 (q->msg_pool.host + q->priv * q->msg_size);
82 #ifdef CCMSGMAGIC
83 BUG_ON(m->magic != be32_to_cpu(CCWR_MAGIC));
84 #endif
85 return m;
86 #else
87 return q->msg_pool.host + q->priv * q->msg_size;
88 #endif
89 }
90 }
91
92 void c2_mq_free(struct c2_mq *q)
93 {
94 BUG_ON(q->magic != C2_MQ_MAGIC);
95 BUG_ON(q->type != C2_MQ_HOST_TARGET);
96
97 if (!c2_mq_empty(q)) {
98
99 #ifdef CCMSGMAGIC
100 {
101 struct c2wr_hdr __iomem *m = (struct c2wr_hdr __iomem *)
102 (q->msg_pool.adapter + q->priv * q->msg_size);
103 __raw_writel(cpu_to_be32(~CCWR_MAGIC), &m->magic);
104 }
105 #endif
106 q->priv = (q->priv + 1) % q->q_size;
107 /* Update peer's offset. */
108 __raw_writew((__force u16) cpu_to_be16(q->priv), &q->peer->shared);
109 }
110 }
111
112
113 void c2_mq_lconsume(struct c2_mq *q, u32 wqe_count)
114 {
115 BUG_ON(q->magic != C2_MQ_MAGIC);
116 BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);
117
118 while (wqe_count--) {
119 BUG_ON(c2_mq_empty(q));
120 *q->shared = cpu_to_be16((be16_to_cpu(*q->shared)+1) % q->q_size);
121 }
122 }
123
124 #if 0
125 u32 c2_mq_count(struct c2_mq *q)
126 {
127 s32 count;
128
129 if (q->type == C2_MQ_HOST_TARGET)
130 count = be16_to_cpu(*q->shared) - q->priv;
131 else
132 count = q->priv - be16_to_cpu(*q->shared);
133
134 if (count < 0)
135 count += q->q_size;
136
137 return (u32) count;
138 }
139 #endif /* 0 */
140
141 void c2_mq_req_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
142 u8 __iomem *pool_start, u16 __iomem *peer, u32 type)
143 {
144 BUG_ON(!q->shared);
145
146 /* This code assumes the byte swapping has already been done! */
147 q->index = index;
148 q->q_size = q_size;
149 q->msg_size = msg_size;
150 q->msg_pool.adapter = pool_start;
151 q->peer = (struct c2_mq_shared __iomem *) peer;
152 q->magic = C2_MQ_MAGIC;
153 q->type = type;
154 q->priv = 0;
155 q->hint_count = 0;
156 return;
157 }
158 void c2_mq_rep_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
159 u8 *pool_start, u16 __iomem *peer, u32 type)
160 {
161 BUG_ON(!q->shared);
162
163 /* This code assumes the byte swapping has already been done! */
164 q->index = index;
165 q->q_size = q_size;
166 q->msg_size = msg_size;
167 q->msg_pool.host = pool_start;
168 q->peer = (struct c2_mq_shared __iomem *) peer;
169 q->magic = C2_MQ_MAGIC;
170 q->type = type;
171 q->priv = 0;
172 q->hint_count = 0;
173 return;
174 }
175
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