drivers/net/ethernet/mellanox/mlx5/core/dev.c

   1 /*
   2  * Copyright (c) 2013-2015, Mellanox Technologies. 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/mlx5/driver.h>
  34 #include "mlx5_core.h"
  35
  36 static LIST_HEAD(intf_list);
  37 static LIST_HEAD(mlx5_dev_list);
  38 /* intf dev list mutex */
  39 static DEFINE_MUTEX(mlx5_intf_mutex);
  40
  41 struct mlx5_device_context {
  42         struct list_head        list;
  43         struct mlx5_interface  *intf;
  44         void                   *context;
  45         unsigned long           state;
  46 };
  47
  48 enum {
  49         MLX5_INTERFACE_ADDED,
  50         MLX5_INTERFACE_ATTACHED,
  51 };
  52
  53
  54 void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
  55 {
  56         struct mlx5_device_context *dev_ctx;
  57         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
  58
  59         if (!mlx5_lag_intf_add(intf, priv))
  60                 return;
  61
  62         dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
  63         if (!dev_ctx)
  64                 return;
  65
  66         dev_ctx->intf = intf;
  67
  68         dev_ctx->context = intf->add(dev);
  69         if (dev_ctx->context) {
  70                 set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
  71                 if (intf->attach)
  72                         set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
  73
  74                 spin_lock_irq(&priv->ctx_lock);
  75                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
  76                 spin_unlock_irq(&priv->ctx_lock);
  77         }
  78
  79         if (!dev_ctx->context)
  80                 kfree(dev_ctx);
  81 }
  82
  83 static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
  84                                                    struct mlx5_priv *priv)
  85 {
  86         struct mlx5_device_context *dev_ctx;
  87
  88         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
  89                 if (dev_ctx->intf == intf)
  90                         return dev_ctx;
  91         return NULL;
  92 }
  93
  94 void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
  95 {
  96         struct mlx5_device_context *dev_ctx;
  97         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
  98
  99         dev_ctx = mlx5_get_device(intf, priv);
 100         if (!dev_ctx)
 101                 return;
 102
 103         spin_lock_irq(&priv->ctx_lock);
 104         list_del(&dev_ctx->list);
 105         spin_unlock_irq(&priv->ctx_lock);
 106
 107         if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 108                 intf->remove(dev, dev_ctx->context);
 109
 110         kfree(dev_ctx);
 111 }
 112
 113 static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 114 {
 115         struct mlx5_device_context *dev_ctx;
 116         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 117
 118         dev_ctx = mlx5_get_device(intf, priv);
 119         if (!dev_ctx)
 120                 return;
 121
 122         if (intf->attach) {
 123                 if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 124                         return;
 125                 if (intf->attach(dev, dev_ctx->context))
 126                         return;
 127                 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 128         } else {
 129                 if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 130                         return;
 131                 dev_ctx->context = intf->add(dev);
 132                 if (!dev_ctx->context)
 133                         return;
 134                 set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 135         }
 136 }
 137
 138 void mlx5_attach_device(struct mlx5_core_dev *dev)
 139 {
 140         struct mlx5_priv *priv = &dev->priv;
 141         struct mlx5_interface *intf;
 142
 143         mutex_lock(&mlx5_intf_mutex);
 144         list_for_each_entry(intf, &intf_list, list)
 145                 mlx5_attach_interface(intf, priv);
 146         mutex_unlock(&mlx5_intf_mutex);
 147 }
 148
 149 static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 150 {
 151         struct mlx5_device_context *dev_ctx;
 152         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 153
 154         dev_ctx = mlx5_get_device(intf, priv);
 155         if (!dev_ctx)
 156                 return;
 157
 158         if (intf->detach) {
 159                 if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 160                         return;
 161                 intf->detach(dev, dev_ctx->context);
 162                 clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 163         } else {
 164                 if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 165                         return;
 166                 intf->remove(dev, dev_ctx->context);
 167                 clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 168         }
 169 }
 170
 171 void mlx5_detach_device(struct mlx5_core_dev *dev)
 172 {
 173         struct mlx5_priv *priv = &dev->priv;
 174         struct mlx5_interface *intf;
 175
 176         mutex_lock(&mlx5_intf_mutex);
 177         list_for_each_entry(intf, &intf_list, list)
 178                 mlx5_detach_interface(intf, priv);
 179         mutex_unlock(&mlx5_intf_mutex);
 180 }
 181
 182 bool mlx5_device_registered(struct mlx5_core_dev *dev)
 183 {
 184         struct mlx5_priv *priv;
 185         bool found = false;
 186
 187         mutex_lock(&mlx5_intf_mutex);
 188         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 189                 if (priv == &dev->priv)
 190                         found = true;
 191         mutex_unlock(&mlx5_intf_mutex);
 192
 193         return found;
 194 }
 195
 196 int mlx5_register_device(struct mlx5_core_dev *dev)
 197 {
 198         struct mlx5_priv *priv = &dev->priv;
 199         struct mlx5_interface *intf;
 200
 201         mutex_lock(&mlx5_intf_mutex);
 202         list_add_tail(&priv->dev_list, &mlx5_dev_list);
 203         list_for_each_entry(intf, &intf_list, list)
 204                 mlx5_add_device(intf, priv);
 205         mutex_unlock(&mlx5_intf_mutex);
 206
 207         return 0;
 208 }
 209
 210 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 211 {
 212         struct mlx5_priv *priv = &dev->priv;
 213         struct mlx5_interface *intf;
 214
 215         mutex_lock(&mlx5_intf_mutex);
 216         list_for_each_entry(intf, &intf_list, list)
 217                 mlx5_remove_device(intf, priv);
 218         list_del(&priv->dev_list);
 219         mutex_unlock(&mlx5_intf_mutex);
 220 }
 221
 222 int mlx5_register_interface(struct mlx5_interface *intf)
 223 {
 224         struct mlx5_priv *priv;
 225
 226         if (!intf->add || !intf->remove)
 227                 return -EINVAL;
 228
 229         mutex_lock(&mlx5_intf_mutex);
 230         list_add_tail(&intf->list, &intf_list);
 231         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 232                 mlx5_add_device(intf, priv);
 233         mutex_unlock(&mlx5_intf_mutex);
 234
 235         return 0;
 236 }
 237 EXPORT_SYMBOL(mlx5_register_interface);
 238
 239 void mlx5_unregister_interface(struct mlx5_interface *intf)
 240 {
 241         struct mlx5_priv *priv;
 242
 243         mutex_lock(&mlx5_intf_mutex);
 244         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 245                 mlx5_remove_device(intf, priv);
 246         list_del(&intf->list);
 247         mutex_unlock(&mlx5_intf_mutex);
 248 }
 249 EXPORT_SYMBOL(mlx5_unregister_interface);
 250
 251 void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol)
 252 {
 253         mutex_lock(&mlx5_intf_mutex);
 254         mlx5_remove_dev_by_protocol(mdev, protocol);
 255         mlx5_add_dev_by_protocol(mdev, protocol);
 256         mutex_unlock(&mlx5_intf_mutex);
 257 }
 258
 259 /* Must be called with intf_mutex held */
 260 void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 261 {
 262         struct mlx5_interface *intf;
 263
 264         list_for_each_entry(intf, &intf_list, list)
 265                 if (intf->protocol == protocol) {
 266                         mlx5_add_device(intf, &dev->priv);
 267                         break;
 268                 }
 269 }
 270
 271 /* Must be called with intf_mutex held */
 272 void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 273 {
 274         struct mlx5_interface *intf;
 275
 276         list_for_each_entry(intf, &intf_list, list)
 277                 if (intf->protocol == protocol) {
 278                         mlx5_remove_device(intf, &dev->priv);
 279                         break;
 280                 }
 281 }
 282
 283 static u32 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
 284 {
 285         return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
 286                      (dev->pdev->bus->number << 8) |
 287                      PCI_SLOT(dev->pdev->devfn));
 288 }
 289
 290 /* Must be called with intf_mutex held */
 291 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 292 {
 293         u32 pci_id = mlx5_gen_pci_id(dev);
 294         struct mlx5_core_dev *res = NULL;
 295         struct mlx5_core_dev *tmp_dev;
 296         struct mlx5_priv *priv;
 297
 298         list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
 299                 tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
 300                 if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
 301                         res = tmp_dev;
 302                         break;
 303                 }
 304         }
 305
 306         return res;
 307 }
 308
 309
 310 void mlx5_dev_list_lock(void)
 311 {
 312         mutex_lock(&mlx5_intf_mutex);
 313 }
 314
 315 void mlx5_dev_list_unlock(void)
 316 {
 317         mutex_unlock(&mlx5_intf_mutex);
 318 }
 319
 320 int mlx5_dev_list_trylock(void)
 321 {
 322         return mutex_trylock(&mlx5_intf_mutex);
 323 }