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 <linux/slab.h>
  35
  36 #include "mlx4.h"
  37
  38 struct mlx4_device_context {
  39         struct list_head        list;
  40         struct mlx4_interface  *intf;
  41         void                   *context;
  42 };
  43
  44 static LIST_HEAD(intf_list);
  45 static LIST_HEAD(dev_list);
  46 static DEFINE_MUTEX(intf_mutex);
  47
  48 static 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
  67 static 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
  83 int 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 }
 100 EXPORT_SYMBOL_GPL(mlx4_register_interface);
 101
 102 void 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 }
 115 EXPORT_SYMBOL_GPL(mlx4_unregister_interface);
 116
 117 void 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
 132 int 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
 149 void 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
 165 void *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 }
 184 EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev);