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
 38struct mlx4_device_context {
 39	struct list_head	list;
 40	struct mlx4_interface  *intf;
 41	void		       *context;
 42};
 43
 44static LIST_HEAD(intf_list);
 45static LIST_HEAD(dev_list);
 46static DEFINE_MUTEX(intf_mutex);
 47
 48static 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
 67static 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
 83int 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}
100EXPORT_SYMBOL_GPL(mlx4_register_interface);
101
102void 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}
115EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
116
117void 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
132int 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
149void 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
165void *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}
184EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);