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 void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
  54 {
  55         struct mlx5_device_context *dev_ctx;
  56         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
  57
  58         if (!mlx5_lag_intf_add(intf, priv))
  59                 return;
  60
  61         dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
  62         if (!dev_ctx)
  63                 return;
  64
  65         dev_ctx->intf = intf;
  66         dev_ctx->context = intf->add(dev);
  67         set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
  68         if (intf->attach)
  69                 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
  70
  71         if (dev_ctx->context) {
  72                 spin_lock_irq(&priv->ctx_lock);
  73                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
  74                 spin_unlock_irq(&priv->ctx_lock);
  75         } else {
  76                 kfree(dev_ctx);
  77         }
  78 }
  79
  80 static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
  81                                                    struct mlx5_priv *priv)
  82 {
  83         struct mlx5_device_context *dev_ctx;
  84
  85         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
  86                 if (dev_ctx->intf == intf)
  87                         return dev_ctx;
  88         return NULL;
  89 }
  90
  91 void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
  92 {
  93         struct mlx5_device_context *dev_ctx;
  94         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
  95
  96         dev_ctx = mlx5_get_device(intf, priv);
  97         if (!dev_ctx)
  98                 return;
  99
 100         spin_lock_irq(&priv->ctx_lock);
 101         list_del(&dev_ctx->list);
 102         spin_unlock_irq(&priv->ctx_lock);
 103
 104         if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 105                 intf->remove(dev, dev_ctx->context);
 106
 107         kfree(dev_ctx);
 108 }
 109
 110 static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 111 {
 112         struct mlx5_device_context *dev_ctx;
 113         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 114
 115         dev_ctx = mlx5_get_device(intf, priv);
 116         if (!dev_ctx)
 117                 return;
 118
 119         if (intf->attach) {
 120                 if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 121                         return;
 122                 intf->attach(dev, dev_ctx->context);
 123                 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 124         } else {
 125                 if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 126                         return;
 127                 dev_ctx->context = intf->add(dev);
 128                 set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 129         }
 130 }
 131
 132 void mlx5_attach_device(struct mlx5_core_dev *dev)
 133 {
 134         struct mlx5_priv *priv = &dev->priv;
 135         struct mlx5_interface *intf;
 136
 137         mutex_lock(&mlx5_intf_mutex);
 138         list_for_each_entry(intf, &intf_list, list)
 139                 mlx5_attach_interface(intf, priv);
 140         mutex_unlock(&mlx5_intf_mutex);
 141 }
 142
 143 static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 144 {
 145         struct mlx5_device_context *dev_ctx;
 146         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 147
 148         dev_ctx = mlx5_get_device(intf, priv);
 149         if (!dev_ctx)
 150                 return;
 151
 152         if (intf->detach) {
 153                 if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 154                         return;
 155                 intf->detach(dev, dev_ctx->context);
 156                 clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 157         } else {
 158                 if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 159                         return;
 160                 intf->remove(dev, dev_ctx->context);
 161                 clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 162         }
 163 }
 164
 165 void mlx5_detach_device(struct mlx5_core_dev *dev)
 166 {
 167         struct mlx5_priv *priv = &dev->priv;
 168         struct mlx5_interface *intf;
 169
 170         mutex_lock(&mlx5_intf_mutex);
 171         list_for_each_entry(intf, &intf_list, list)
 172                 mlx5_detach_interface(intf, priv);
 173         mutex_unlock(&mlx5_intf_mutex);
 174 }
 175
 176 bool mlx5_device_registered(struct mlx5_core_dev *dev)
 177 {
 178         struct mlx5_priv *priv;
 179         bool found = false;
 180
 181         mutex_lock(&mlx5_intf_mutex);
 182         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 183                 if (priv == &dev->priv)
 184                         found = true;
 185         mutex_unlock(&mlx5_intf_mutex);
 186
 187         return found;
 188 }
 189
 190 int mlx5_register_device(struct mlx5_core_dev *dev)
 191 {
 192         struct mlx5_priv *priv = &dev->priv;
 193         struct mlx5_interface *intf;
 194
 195         mutex_lock(&mlx5_intf_mutex);
 196         list_add_tail(&priv->dev_list, &mlx5_dev_list);
 197         list_for_each_entry(intf, &intf_list, list)
 198                 mlx5_add_device(intf, priv);
 199         mutex_unlock(&mlx5_intf_mutex);
 200
 201         return 0;
 202 }
 203
 204 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 205 {
 206         struct mlx5_priv *priv = &dev->priv;
 207         struct mlx5_interface *intf;
 208
 209         mutex_lock(&mlx5_intf_mutex);
 210         list_for_each_entry(intf, &intf_list, list)
 211                 mlx5_remove_device(intf, priv);
 212         list_del(&priv->dev_list);
 213         mutex_unlock(&mlx5_intf_mutex);
 214 }
 215
 216 int mlx5_register_interface(struct mlx5_interface *intf)
 217 {
 218         struct mlx5_priv *priv;
 219
 220         if (!intf->add || !intf->remove)
 221                 return -EINVAL;
 222
 223         mutex_lock(&mlx5_intf_mutex);
 224         list_add_tail(&intf->list, &intf_list);
 225         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 226                 mlx5_add_device(intf, priv);
 227         mutex_unlock(&mlx5_intf_mutex);
 228
 229         return 0;
 230 }
 231 EXPORT_SYMBOL(mlx5_register_interface);
 232
 233 void mlx5_unregister_interface(struct mlx5_interface *intf)
 234 {
 235         struct mlx5_priv *priv;
 236
 237         mutex_lock(&mlx5_intf_mutex);
 238         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 239                 mlx5_remove_device(intf, priv);
 240         list_del(&intf->list);
 241         mutex_unlock(&mlx5_intf_mutex);
 242 }
 243 EXPORT_SYMBOL(mlx5_unregister_interface);
 244
 245 void *mlx5_get_protocol_dev(struct mlx5_core_dev *mdev, int protocol)
 246 {
 247         struct mlx5_priv *priv = &mdev->priv;
 248         struct mlx5_device_context *dev_ctx;
 249         unsigned long flags;
 250         void *result = NULL;
 251
 252         spin_lock_irqsave(&priv->ctx_lock, flags);
 253
 254         list_for_each_entry(dev_ctx, &mdev->priv.ctx_list, list)
 255                 if ((dev_ctx->intf->protocol == protocol) &&
 256                     dev_ctx->intf->get_dev) {
 257                         result = dev_ctx->intf->get_dev(dev_ctx->context);
 258                         break;
 259                 }
 260
 261         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 262
 263         return result;
 264 }
 265 EXPORT_SYMBOL(mlx5_get_protocol_dev);
 266
 267 /* Must be called with intf_mutex held */
 268 void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 269 {
 270         struct mlx5_interface *intf;
 271
 272         list_for_each_entry(intf, &intf_list, list)
 273                 if (intf->protocol == protocol) {
 274                         mlx5_add_device(intf, &dev->priv);
 275                         break;
 276                 }
 277 }
 278
 279 /* Must be called with intf_mutex held */
 280 void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 281 {
 282         struct mlx5_interface *intf;
 283
 284         list_for_each_entry(intf, &intf_list, list)
 285                 if (intf->protocol == protocol) {
 286                         mlx5_remove_device(intf, &dev->priv);
 287                         break;
 288                 }
 289 }
 290
 291 static u16 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
 292 {
 293         return (u16)((dev->pdev->bus->number << 8) |
 294                      PCI_SLOT(dev->pdev->devfn));
 295 }
 296
 297 /* Must be called with intf_mutex held */
 298 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 299 {
 300         u16 pci_id = mlx5_gen_pci_id(dev);
 301         struct mlx5_core_dev *res = NULL;
 302         struct mlx5_core_dev *tmp_dev;
 303         struct mlx5_priv *priv;
 304
 305         list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
 306                 tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
 307                 if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
 308                         res = tmp_dev;
 309                         break;
 310                 }
 311         }
 312
 313         return res;
 314 }
 315
 316 void mlx5_core_event(struct mlx5_core_dev *dev, enum mlx5_dev_event event,
 317                      unsigned long param)
 318 {
 319         struct mlx5_priv *priv = &dev->priv;
 320         struct mlx5_device_context *dev_ctx;
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&priv->ctx_lock, flags);
 324
 325         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 326                 if (dev_ctx->intf->event)
 327                         dev_ctx->intf->event(dev, dev_ctx->context, event, param);
 328
 329         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 330 }
 331
 332 void mlx5_dev_list_lock(void)
 333 {
 334         mutex_lock(&mlx5_intf_mutex);
 335 }
 336
 337 void mlx5_dev_list_unlock(void)
 338 {
 339         mutex_unlock(&mlx5_intf_mutex);
 340 }
 341
 342 int mlx5_dev_list_trylock(void)
 343 {
 344         return mutex_trylock(&mlx5_intf_mutex);
 345 }