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
37struct mlx4_device_context {
38	struct list_head	list;
39	struct mlx4_interface  *intf;
40	void		       *context;
41};
42
43static LIST_HEAD(intf_list);
44static LIST_HEAD(dev_list);
45static DEFINE_MUTEX(intf_mutex);
46
47static 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
66static 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
82int 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}
99EXPORT_SYMBOL_GPL(mlx4_register_interface);
100
101void 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}
114EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
115
116void 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
133int 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
146	return 0;
147}
148
149void mlx4_unregister_device(struct mlx4_dev *dev)
150{
151	struct mlx4_priv *priv = mlx4_priv(dev);
152	struct mlx4_interface *intf;
153
154	mutex_lock(&intf_mutex);
155
156	list_for_each_entry(intf, &intf_list, list)
157		mlx4_remove_device(intf, priv);
158
159	list_del(&priv->dev_list);
160
161	mutex_unlock(&intf_mutex);
162}
163