1 /*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/mlx4/driver.h>
34
35 #include "mlx4.h"
36
37 struct mlx4_device_context {
38 struct list_head list;
39 struct mlx4_interface *intf;
40 void *context;
41 };
42
43 static LIST_HEAD(intf_list);
44 static LIST_HEAD(dev_list);
45 static DEFINE_MUTEX(intf_mutex);
46
47 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
48 {
49 struct mlx4_device_context *dev_ctx;
50
51 dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
52 if (!dev_ctx)
53 return;
54
55 dev_ctx->intf = intf;
56 dev_ctx->context = intf->add(&priv->dev);
57
58 if (dev_ctx->context) {
59 spin_lock_irq(&priv->ctx_lock);
60 list_add_tail(&dev_ctx->list, &priv->ctx_list);
61 spin_unlock_irq(&priv->ctx_lock);
62 } else
63 kfree(dev_ctx);
64 }
65
66 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
67 {
68 struct mlx4_device_context *dev_ctx;
69
70 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
71 if (dev_ctx->intf == intf) {
72 spin_lock_irq(&priv->ctx_lock);
73 list_del(&dev_ctx->list);
74 spin_unlock_irq(&priv->ctx_lock);
75
76 intf->remove(&priv->dev, dev_ctx->context);
77 kfree(dev_ctx);
78 return;
79 }
80 }
81
82 int mlx4_register_interface(struct mlx4_interface *intf)
83 {
84 struct mlx4_priv *priv;
85
86 if (!intf->add || !intf->remove)
87 return -EINVAL;
88
89 mutex_lock(&intf_mutex);
90
91 list_add_tail(&intf->list, &intf_list);
92 list_for_each_entry(priv, &dev_list, dev_list)
93 mlx4_add_device(intf, priv);
94
95 mutex_unlock(&intf_mutex);
96
97 return 0;
98 }
99 EXPORT_SYMBOL_GPL(mlx4_register_interface);
100
101 void mlx4_unregister_interface(struct mlx4_interface *intf)
102 {
103 struct mlx4_priv *priv;
104
105 mutex_lock(&intf_mutex);
106
107 list_for_each_entry(priv, &dev_list, dev_list)
108 mlx4_remove_device(intf, priv);
109
110 list_del(&intf->list);
111
112 mutex_unlock(&intf_mutex);
113 }
114 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
115
116 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_event type,
117 int subtype, int port)
118 {
119 struct mlx4_priv *priv = mlx4_priv(dev);
120 struct mlx4_device_context *dev_ctx;
121 unsigned long flags;
122
123 spin_lock_irqsave(&priv->ctx_lock, flags);
124
125 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
126 if (dev_ctx->intf->event)
127 dev_ctx->intf->event(dev, dev_ctx->context, type,
128 subtype, port);
129
130 spin_unlock_irqrestore(&priv->ctx_lock, flags);
131 }
132
133 int mlx4_register_device(struct mlx4_dev *dev)
134 {
135 struct mlx4_priv *priv = mlx4_priv(dev);
136 struct mlx4_interface *intf;
137
138 mutex_lock(&intf_mutex);
139
140 list_add_tail(&priv->dev_list, &dev_list);
141 list_for_each_entry(intf, &intf_list, list)
142 mlx4_add_device(intf, priv);
143
144 mutex_unlock(&intf_mutex);
145 mlx4_start_catas_poll(dev);
146
147 return 0;
148 }
149
150 void mlx4_unregister_device(struct mlx4_dev *dev)
151 {
152 struct mlx4_priv *priv = mlx4_priv(dev);
153 struct mlx4_interface *intf;
154
155 mlx4_stop_catas_poll(dev);
156 mutex_lock(&intf_mutex);
157
158 list_for_each_entry(intf, &intf_list, list)
159 mlx4_remove_device(intf, priv);
160
161 list_del(&priv->dev_list);
162
163 mutex_unlock(&intf_mutex);
164 }
165
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