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 "mlx4.h"
  34
  35 struct mlx4_device_context {
  36         struct list_head        list;
  37         struct mlx4_interface  *intf;
  38         void                   *context;
  39 };
  40
  41 static LIST_HEAD(intf_list);
  42 static LIST_HEAD(dev_list);
  43 static DEFINE_MUTEX(intf_mutex);
  44
  45 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  46 {
  47         struct mlx4_device_context *dev_ctx;
  48
  49         dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL);
  50         if (!dev_ctx)
  51                 return;
  52
  53         dev_ctx->intf    = intf;
  54         dev_ctx->context = intf->add(&priv->dev);
  55
  56         if (dev_ctx->context) {
  57                 spin_lock_irq(&priv->ctx_lock);
  58                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
  59                 spin_unlock_irq(&priv->ctx_lock);
  60         } else
  61                 kfree(dev_ctx);
  62 }
  63
  64 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv)
  65 {
  66         struct mlx4_device_context *dev_ctx;
  67
  68         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
  69                 if (dev_ctx->intf == intf) {
  70                         spin_lock_irq(&priv->ctx_lock);
  71                         list_del(&dev_ctx->list);
  72                         spin_unlock_irq(&priv->ctx_lock);
  73
  74                         intf->remove(&priv->dev, dev_ctx->context);
  75                         kfree(dev_ctx);
  76                         return;
  77                 }
  78 }
  79
  80 int mlx4_register_interface(struct mlx4_interface *intf)
  81 {
  82         struct mlx4_priv *priv;
  83
  84         if (!intf->add || !intf->remove)
  85                 return -EINVAL;
  86
  87         mutex_lock(&intf_mutex);
  88
  89         list_add_tail(&intf->list, &intf_list);
  90         list_for_each_entry(priv, &dev_list, dev_list)
  91                 mlx4_add_device(intf, priv);
  92
  93         mutex_unlock(&intf_mutex);
  94
  95         return 0;
  96 }
  97 EXPORT_SYMBOL_GPL(mlx4_register_interface);
  98
  99 void mlx4_unregister_interface(struct mlx4_interface *intf)
 100 {
 101         struct mlx4_priv *priv;
 102
 103         mutex_lock(&intf_mutex);
 104
 105         list_for_each_entry(priv, &dev_list, dev_list)
 106                 mlx4_remove_device(intf, priv);
 107
 108         list_del(&intf->list);
 109
 110         mutex_unlock(&intf_mutex);
 111 }
 112 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
 113
 114 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type, int port)
 115 {
 116         struct mlx4_priv *priv = mlx4_priv(dev);
 117         struct mlx4_device_context *dev_ctx;
 118         unsigned long flags;
 119
 120         spin_lock_irqsave(&priv->ctx_lock, flags);
 121
 122         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 123                 if (dev_ctx->intf->event)
 124                         dev_ctx->intf->event(dev, dev_ctx->context, type, port);
 125
 126         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 127 }
 128
 129 int mlx4_register_device(struct mlx4_dev *dev)
 130 {
 131         struct mlx4_priv *priv = mlx4_priv(dev);
 132         struct mlx4_interface *intf;
 133
 134         mutex_lock(&intf_mutex);
 135
 136         list_add_tail(&priv->dev_list, &dev_list);
 137         list_for_each_entry(intf, &intf_list, list)
 138                 mlx4_add_device(intf, priv);
 139
 140         mutex_unlock(&intf_mutex);
 141         mlx4_start_catas_poll(dev);
 142
 143         return 0;
 144 }
 145
 146 void mlx4_unregister_device(struct mlx4_dev *dev)
 147 {
 148         struct mlx4_priv *priv = mlx4_priv(dev);
 149         struct mlx4_interface *intf;
 150
 151         mlx4_stop_catas_poll(dev);
 152         mutex_lock(&intf_mutex);
 153
 154         list_for_each_entry(intf, &intf_list, list)
 155                 mlx4_remove_device(intf, priv);
 156
 157         list_del(&priv->dev_list);
 158
 159         mutex_unlock(&intf_mutex);
 160 }