intf.c revision 272407 
1/*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008, 2014 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#include <linux/module.h>
36
37#include "mlx4.h"
38
39struct mlx4_device_context {
40	struct list_head	list;
41	struct mlx4_interface  *intf;
42	void		       *context;
43};
44
45static LIST_HEAD(intf_list);
46static LIST_HEAD(dev_list);
47static DEFINE_MUTEX(intf_mutex);
48
49static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
50{
51	struct mlx4_device_context *dev_ctx;
52
53	dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
54	if (!dev_ctx)
55		return;
56
57	dev_ctx->intf    = intf;
58	dev_ctx->context = intf->add(&priv->dev);
59
60	if (dev_ctx->context) {
61		spin_lock_irq(&priv->ctx_lock);
62		list_add_tail(&dev_ctx->list, &priv->ctx_list);
63		spin_unlock_irq(&priv->ctx_lock);
64	} else
65		kfree(dev_ctx);
66}
67
68static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
69{
70	struct mlx4_device_context *dev_ctx;
71
72	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
73		if (dev_ctx->intf == intf) {
74			spin_lock_irq(&priv->ctx_lock);
75			list_del(&dev_ctx->list);
76			spin_unlock_irq(&priv->ctx_lock);
77
78			intf->remove(&priv->dev, dev_ctx->context);
79			kfree(dev_ctx);
80			return;
81		}
82}
83
84int mlx4_register_interface(struct mlx4_interface *intf)
85{
86	struct mlx4_priv *priv;
87
88	if (!intf->add || !intf->remove)
89		return -EINVAL;
90
91	mutex_lock(&intf_mutex);
92
93	list_add_tail(&intf->list, &intf_list);
94	list_for_each_entry(priv, &dev_list, dev_list)
95		mlx4_add_device(intf, priv);
96
97	mutex_unlock(&intf_mutex);
98
99	return 0;
100}
101EXPORT_SYMBOL_GPL(mlx4_register_interface);
102
103void mlx4_unregister_interface(struct mlx4_interface *intf)
104{
105	struct mlx4_priv *priv;
106
107	mutex_lock(&intf_mutex);
108
109	list_for_each_entry(priv, &dev_list, dev_list)
110		mlx4_remove_device(intf, priv);
111
112	list_del(&intf->list);
113
114	mutex_unlock(&intf_mutex);
115}
116EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
117
118void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type,
119			 unsigned long param)
120{
121	struct mlx4_priv *priv = mlx4_priv(dev);
122	struct mlx4_device_context *dev_ctx;
123	unsigned long flags;
124
125	spin_lock_irqsave(&priv->ctx_lock, flags);
126
127	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
128		if (dev_ctx->intf->event)
129			dev_ctx->intf->event(dev, dev_ctx->context, type, param);
130
131	spin_unlock_irqrestore(&priv->ctx_lock, flags);
132}
133
134int mlx4_register_device(struct mlx4_dev *dev)
135{
136	struct mlx4_priv *priv = mlx4_priv(dev);
137	struct mlx4_interface *intf;
138
139	mutex_lock(&intf_mutex);
140
141	list_add_tail(&priv->dev_list, &dev_list);
142	list_for_each_entry(intf, &intf_list, list)
143		mlx4_add_device(intf, priv);
144
145	mutex_unlock(&intf_mutex);
146	if (!mlx4_is_slave(dev))
147		mlx4_start_catas_poll(dev);
148
149	return 0;
150}
151
152void mlx4_unregister_device(struct mlx4_dev *dev)
153{
154	struct mlx4_priv *priv = mlx4_priv(dev);
155	struct mlx4_interface *intf;
156
157	if (!mlx4_is_slave(dev))
158		mlx4_stop_catas_poll(dev);
159	mutex_lock(&intf_mutex);
160
161	list_for_each_entry(intf, &intf_list, list)
162		mlx4_remove_device(intf, priv);
163
164	list_del_init(&priv->dev_list);
165
166	mutex_unlock(&intf_mutex);
167}
168
169void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port)
170{
171	struct mlx4_priv *priv = mlx4_priv(dev);
172	struct mlx4_device_context *dev_ctx;
173	unsigned long flags;
174	void *result = NULL;
175
176	spin_lock_irqsave(&priv->ctx_lock, flags);
177
178	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
179		if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) {
180			result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port);
181			break;
182		}
183
184	spin_unlock_irqrestore(&priv->ctx_lock, flags);
185
186	return result;
187}
188EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);
189