summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/amso1100/c2_mq.c
blob: b88a755921026bbf8a01c7d1f887b3e0cc4983e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
 * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include "c2.h"
#include "c2_mq.h"

void *c2_mq_alloc(struct c2_mq *q)
{
	BUG_ON(q->magic != C2_MQ_MAGIC);
	BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);

	if (c2_mq_full(q)) {
		return NULL;
	} else {
#ifdef DEBUG
		struct c2wr_hdr *m =
		    (struct c2wr_hdr *) (q->msg_pool.host + q->priv * q->msg_size);
#ifdef CCMSGMAGIC
		BUG_ON(m->magic != be32_to_cpu(~CCWR_MAGIC));
		m->magic = cpu_to_be32(CCWR_MAGIC);
#endif
		return m;
#else
		return q->msg_pool.host + q->priv * q->msg_size;
#endif
	}
}

void c2_mq_produce(struct c2_mq *q)
{
	BUG_ON(q->magic != C2_MQ_MAGIC);
	BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);

	if (!c2_mq_full(q)) {
		q->priv = (q->priv + 1) % q->q_size;
		q->hint_count++;
		/* Update peer's offset. */
		__raw_writew(cpu_to_be16(q->priv), &q->peer->shared);
	}
}

void *c2_mq_consume(struct c2_mq *q)
{
	BUG_ON(q->magic != C2_MQ_MAGIC);
	BUG_ON(q->type != C2_MQ_HOST_TARGET);

	if (c2_mq_empty(q)) {
		return NULL;
	} else {
#ifdef DEBUG
		struct c2wr_hdr *m = (struct c2wr_hdr *)
		    (q->msg_pool.host + q->priv * q->msg_size);
#ifdef CCMSGMAGIC
		BUG_ON(m->magic != be32_to_cpu(CCWR_MAGIC));
#endif
		return m;
#else
		return q->msg_pool.host + q->priv * q->msg_size;
#endif
	}
}

void c2_mq_free(struct c2_mq *q)
{
	BUG_ON(q->magic != C2_MQ_MAGIC);
	BUG_ON(q->type != C2_MQ_HOST_TARGET);

	if (!c2_mq_empty(q)) {

#ifdef CCMSGMAGIC
		{
			struct c2wr_hdr __iomem *m = (struct c2wr_hdr __iomem *)
			    (q->msg_pool.adapter + q->priv * q->msg_size);
			__raw_writel(cpu_to_be32(~CCWR_MAGIC), &m->magic);
		}
#endif
		q->priv = (q->priv + 1) % q->q_size;
		/* Update peer's offset. */
		__raw_writew(cpu_to_be16(q->priv), &q->peer->shared);
	}
}


void c2_mq_lconsume(struct c2_mq *q, u32 wqe_count)
{
	BUG_ON(q->magic != C2_MQ_MAGIC);
	BUG_ON(q->type != C2_MQ_ADAPTER_TARGET);

	while (wqe_count--) {
		BUG_ON(c2_mq_empty(q));
		*q->shared = cpu_to_be16((be16_to_cpu(*q->shared)+1) % q->q_size);
	}
}

#if 0
u32 c2_mq_count(struct c2_mq *q)
{
	s32 count;

	if (q->type == C2_MQ_HOST_TARGET)
		count = be16_to_cpu(*q->shared) - q->priv;
	else
		count = q->priv - be16_to_cpu(*q->shared);

	if (count < 0)
		count += q->q_size;

	return (u32) count;
}
#endif  /*  0  */

void c2_mq_req_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
		    u8 __iomem *pool_start, u16 __iomem *peer, u32 type)
{
	BUG_ON(!q->shared);

	/* This code assumes the byte swapping has already been done! */
	q->index = index;
	q->q_size = q_size;
	q->msg_size = msg_size;
	q->msg_pool.adapter = pool_start;
	q->peer = (struct c2_mq_shared __iomem *) peer;
	q->magic = C2_MQ_MAGIC;
	q->type = type;
	q->priv = 0;
	q->hint_count = 0;
	return;
}
void c2_mq_rep_init(struct c2_mq *q, u32 index, u32 q_size, u32 msg_size,
		    u8 *pool_start, u16 __iomem *peer, u32 type)
{
	BUG_ON(!q->shared);

	/* This code assumes the byte swapping has already been done! */
	q->index = index;
	q->q_size = q_size;
	q->msg_size = msg_size;
	q->msg_pool.host = pool_start;
	q->peer = (struct c2_mq_shared __iomem *) peer;
	q->magic = C2_MQ_MAGIC;
	q->type = type;
	q->priv = 0;
	q->hint_count = 0;
	return;
}
OpenPOWER on IntegriCloud