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 #include <linux/export.h> 36 37 #include "mlx4.h" 38 39 struct mlx4_device_context { 40 struct list_head list; 41 struct mlx4_interface *intf; 42 void *context; 43 }; 44 45 static LIST_HEAD(intf_list); 46 static LIST_HEAD(dev_list); 47 static DEFINE_MUTEX(intf_mutex); 48 49 static void mlx4_add_device(struct mlx4_interface *intf, struct mlx4_priv *priv) 50 { 51 struct mlx4_device_context *dev_ctx; 52 53 dev_ctx = kmalloc(sizeof *dev_ctx, GFP_KERNEL); 54 if (!dev_ctx) 55 return; 56 57 dev_ctx->intf = intf; 58 dev_ctx->context = intf->add(&priv->dev); 59 60 if (dev_ctx->context) { 61 spin_lock_irq(&priv->ctx_lock); 62 list_add_tail(&dev_ctx->list, &priv->ctx_list); 63 spin_unlock_irq(&priv->ctx_lock); 64 } else 65 kfree(dev_ctx); 66 } 67 68 static void mlx4_remove_device(struct mlx4_interface *intf, struct mlx4_priv *priv) 69 { 70 struct mlx4_device_context *dev_ctx; 71 72 list_for_each_entry(dev_ctx, &priv->ctx_list, list) 73 if (dev_ctx->intf == intf) { 74 spin_lock_irq(&priv->ctx_lock); 75 list_del(&dev_ctx->list); 76 spin_unlock_irq(&priv->ctx_lock); 77 78 intf->remove(&priv->dev, dev_ctx->context); 79 kfree(dev_ctx); 80 return; 81 } 82 } 83 84 int mlx4_register_interface(struct mlx4_interface *intf) 85 { 86 struct mlx4_priv *priv; 87 88 if (!intf->add || !intf->remove) 89 return -EINVAL; 90 91 mutex_lock(&intf_mutex); 92 93 list_add_tail(&intf->list, &intf_list); 94 list_for_each_entry(priv, &dev_list, dev_list) 95 mlx4_add_device(intf, priv); 96 97 mutex_unlock(&intf_mutex); 98 99 return 0; 100 } 101 EXPORT_SYMBOL_GPL(mlx4_register_interface); 102 103 void mlx4_unregister_interface(struct mlx4_interface *intf) 104 { 105 struct mlx4_priv *priv; 106 107 mutex_lock(&intf_mutex); 108 109 list_for_each_entry(priv, &dev_list, dev_list) 110 mlx4_remove_device(intf, priv); 111 112 list_del(&intf->list); 113 114 mutex_unlock(&intf_mutex); 115 } 116 EXPORT_SYMBOL_GPL(mlx4_unregister_interface); 117 118 void mlx4_dispatch_event(struct mlx4_dev *dev, enum mlx4_dev_event type, int port) 119 { 120 struct mlx4_priv *priv = mlx4_priv(dev); 121 struct mlx4_device_context *dev_ctx; 122 unsigned long flags; 123 124 spin_lock_irqsave(&priv->ctx_lock, flags); 125 126 list_for_each_entry(dev_ctx, &priv->ctx_list, list) 127 if (dev_ctx->intf->event) 128 dev_ctx->intf->event(dev, dev_ctx->context, type, 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 mutex_lock(&intf_mutex); 139 140 list_add_tail(&priv->dev_list, &dev_list); 141 list_for_each_entry(intf, &intf_list, list) 142 mlx4_add_device(intf, priv); 143 144 mutex_unlock(&intf_mutex); 145 if (!mlx4_is_slave(dev)) 146 mlx4_start_catas_poll(dev); 147 148 return 0; 149 } 150 151 void mlx4_unregister_device(struct mlx4_dev *dev) 152 { 153 struct mlx4_priv *priv = mlx4_priv(dev); 154 struct mlx4_interface *intf; 155 156 if (!mlx4_is_slave(dev)) 157 mlx4_stop_catas_poll(dev); 158 mutex_lock(&intf_mutex); 159 160 list_for_each_entry(intf, &intf_list, list) 161 mlx4_remove_device(intf, priv); 162 163 list_del(&priv->dev_list); 164 165 mutex_unlock(&intf_mutex); 166 } 167 168 void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port) 169 { 170 struct mlx4_priv *priv = mlx4_priv(dev); 171 struct mlx4_device_context *dev_ctx; 172 unsigned long flags; 173 void *result = NULL; 174 175 spin_lock_irqsave(&priv->ctx_lock, flags); 176 177 list_for_each_entry(dev_ctx, &priv->ctx_list, list) 178 if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) { 179 result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port); 180 break; 181 } 182 183 spin_unlock_irqrestore(&priv->ctx_lock, flags); 184 185 return result; 186 } 187 EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev); 188