drivers/net/mlx4/intf.c

   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         INIT_LIST_HEAD(&priv->ctx_list);
 139         spin_lock_init(&priv->ctx_lock);
 140
 141         mutex_lock(&intf_mutex);
 142
 143         list_add_tail(&priv->dev_list, &dev_list);
 144         list_for_each_entry(intf, &intf_list, list)
 145                 mlx4_add_device(intf, priv);
 146
 147         mutex_unlock(&intf_mutex);
 148
 149         return 0;
 150 }
 151
 152 void mlx4_unregister_device(struct mlx4_dev *dev)
 153 {
 154         struct mlx4_priv *priv = mlx4_priv(dev);
 155         struct mlx4_interface *intf;
 156
 157         mutex_lock(&intf_mutex);
 158
 159         list_for_each_entry(intf, &intf_list, list)
 160                 mlx4_remove_device(intf, priv);
 161
 162         list_del(&priv->dev_list);
 163
 164         mutex_unlock(&intf_mutex);
 165 }