1 /*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
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 #include <linux/slab.h>
35
36 #include "mlx4.h"
37
38 struct mlx4_device_context {
39 struct list_head list;
40 struct mlx4_interface *intf;
41 void *context;
42 };
43
44 static LIST_HEAD(intf_list);
45 static LIST_HEAD(dev_list);
46 static DEFINE_MUTEX(intf_mutex);
47
mlx4_add_device(struct mlx4_interface * intf,struct mlx4_priv * priv)48 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
49 {
50 struct mlx4_device_context *dev_ctx;
51
52 dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
53 if (!dev_ctx)
54 return;
55
56 dev_ctx->intf = intf;
57 dev_ctx->context = intf->add(&priv->dev);
58
59 if (dev_ctx->context) {
60 spin_lock_irq(&priv->ctx_lock);
61 list_add_tail(&dev_ctx->list, &priv->ctx_list);
62 spin_unlock_irq(&priv->ctx_lock);
63 } else
64 kfree(dev_ctx);
65 }
66
mlx4_remove_device(struct mlx4_interface * intf,struct mlx4_priv * priv)67 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
68 {
69 struct mlx4_device_context *dev_ctx;
70
71 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
72 if (dev_ctx->intf == intf) {
73 spin_lock_irq(&priv->ctx_lock);
74 list_del(&dev_ctx->list);
75 spin_unlock_irq(&priv->ctx_lock);
76
77 intf->remove(&priv->dev, dev_ctx->context);
78 kfree(dev_ctx);
79 return;
80 }
81 }
82
mlx4_register_interface(struct mlx4_interface * intf)83 int mlx4_register_interface(struct mlx4_interface *intf)
84 {
85 struct mlx4_priv *priv;
86
87 if (!intf->add || !intf->remove)
88 return -EINVAL;
89
90 mutex_lock(&intf_mutex);
91
92 list_add_tail(&intf->list, &intf_list);
93 list_for_each_entry(priv, &dev_list, dev_list)
94 mlx4_add_device(intf, priv);
95
96 mutex_unlock(&intf_mutex);
97
98 return 0;
99 }
100 EXPORT_SYMBOL_GPL(mlx4_register_interface);
101
mlx4_unregister_interface(struct mlx4_interface * intf)102 void mlx4_unregister_interface(struct mlx4_interface *intf)
103 {
104 struct mlx4_priv *priv;
105
106 mutex_lock(&intf_mutex);
107
108 list_for_each_entry(priv, &dev_list, dev_list)
109 mlx4_remove_device(intf, priv);
110
111 list_del(&intf->list);
112
113 mutex_unlock(&intf_mutex);
114 }
115 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
116
mlx4_dispatch_event(struct mlx4_dev * dev,enum mlx4_dev_event type,int port)117 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type, 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, port);
128
129 spin_unlock_irqrestore(&priv->ctx_lock, flags);
130 }
131
mlx4_register_device(struct mlx4_dev * dev)132 int mlx4_register_device(struct mlx4_dev *dev)
133 {
134 struct mlx4_priv *priv = mlx4_priv(dev);
135 struct mlx4_interface *intf;
136
137 mutex_lock(&intf_mutex);
138
139 list_add_tail(&priv->dev_list, &dev_list);
140 list_for_each_entry(intf, &intf_list, list)
141 mlx4_add_device(intf, priv);
142
143 mutex_unlock(&intf_mutex);
144 mlx4_start_catas_poll(dev);
145
146 return 0;
147 }
148
mlx4_unregister_device(struct mlx4_dev * dev)149 void mlx4_unregister_device(struct mlx4_dev *dev)
150 {
151 struct mlx4_priv *priv = mlx4_priv(dev);
152 struct mlx4_interface *intf;
153
154 mlx4_stop_catas_poll(dev);
155 mutex_lock(&intf_mutex);
156
157 list_for_each_entry(intf, &intf_list, list)
158 mlx4_remove_device(intf, priv);
159
160 list_del(&priv->dev_list);
161
162 mutex_unlock(&intf_mutex);
163 }
164
mlx4_get_protocol_dev(struct mlx4_dev * dev,enum mlx4_protocol proto,int port)165 void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port)
166 {
167 struct mlx4_priv *priv = mlx4_priv(dev);
168 struct mlx4_device_context *dev_ctx;
169 unsigned long flags;
170 void *result = NULL;
171
172 spin_lock_irqsave(&priv->ctx_lock, flags);
173
174 list_for_each_entry(dev_ctx, &priv->ctx_list, list)
175 if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) {
176 result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port);
177 break;
178 }
179
180 spin_unlock_irqrestore(&priv->ctx_lock, flags);
181
182 return result;
183 }
184 EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);
185