drivers/net/mlx4/intf.c

   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 "mlx4.h"
  35
  36 struct mlx4_device_context {
  37         struct list_head        list;
  38         struct mlx4_interface  *intf;
  39         void                   *context;
  40 };
  41
  42 static LIST_HEAD(intf_list);
  43 static LIST_HEAD(dev_list);
  44 static DEFINE_MUTEX(intf_mutex);
  45
  46 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  47 {
  48         struct mlx4_device_context *dev_ctx;
  49
  50         dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
  51         if (!dev_ctx)
  52                 return;
  53
  54         dev_ctx->intf    = intf;
  55         dev_ctx->context = intf->add(&priv->dev);
  56
  57         if (dev_ctx->context) {
  58                 spin_lock_irq(&priv->ctx_lock);
  59                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
  60                 spin_unlock_irq(&priv->ctx_lock);
  61         } else
  62                 kfree(dev_ctx);
  63 }
  64
  65 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  66 {
  67         struct mlx4_device_context *dev_ctx;
  68
  69         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
  70                 if (dev_ctx->intf == intf) {
  71                         spin_lock_irq(&priv->ctx_lock);
  72                         list_del(&dev_ctx->list);
  73                         spin_unlock_irq(&priv->ctx_lock);
  74
  75                         intf->remove(&priv->dev, dev_ctx->context);
  76                         kfree(dev_ctx);
  77                         return;
  78                 }
  79 }
  80
  81 int mlx4_register_interface(struct mlx4_interface *intf)
  82 {
  83         struct mlx4_priv *priv;
  84
  85         if (!intf->add || !intf->remove)
  86                 return -EINVAL;
  87
  88         mutex_lock(&intf_mutex);
  89
  90         list_add_tail(&intf->list, &intf_list);
  91         list_for_each_entry(priv, &dev_list, dev_list)
  92                 mlx4_add_device(intf, priv);
  93
  94         mutex_unlock(&intf_mutex);
  95
  96         return 0;
  97 }
  98 EXPORT_SYMBOL_GPL(mlx4_register_interface);
  99
 100 void mlx4_unregister_interface(struct mlx4_interface *intf)
 101 {
 102         struct mlx4_priv *priv;
 103
 104         mutex_lock(&intf_mutex);
 105
 106         list_for_each_entry(priv, &dev_list, dev_list)
 107                 mlx4_remove_device(intf, priv);
 108
 109         list_del(&intf->list);
 110
 111         mutex_unlock(&intf_mutex);
 112 }
 113 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
 114
 115 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type, int port)
 116 {
 117         struct mlx4_priv *priv = mlx4_priv(dev);
 118         struct mlx4_device_context *dev_ctx;
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&priv->ctx_lock, flags);
 122
 123         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 124                 if (dev_ctx->intf->event)
 125                         dev_ctx->intf->event(dev, dev_ctx->context, type, port);
 126
 127         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 128 }
 129
 130 int mlx4_register_device(struct mlx4_dev *dev)
 131 {
 132         struct mlx4_priv *priv = mlx4_priv(dev);
 133         struct mlx4_interface *intf;
 134
 135         mutex_lock(&intf_mutex);
 136
 137         list_add_tail(&priv->dev_list, &dev_list);
 138         list_for_each_entry(intf, &intf_list, list)
 139                 mlx4_add_device(intf, priv);
 140
 141         mutex_unlock(&intf_mutex);
 142         mlx4_start_catas_poll(dev);
 143
 144         return 0;
 145 }
 146
 147 void mlx4_unregister_device(struct mlx4_dev *dev)
 148 {
 149         struct mlx4_priv *priv = mlx4_priv(dev);
 150         struct mlx4_interface *intf;
 151
 152         mlx4_stop_catas_poll(dev);
 153         mutex_lock(&intf_mutex);
 154
 155         list_for_each_entry(intf, &intf_list, list)
 156                 mlx4_remove_device(intf, priv);
 157
 158         list_del(&priv->dev_list);
 159
 160         mutex_unlock(&intf_mutex);
 161 }