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 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
  75                 if (dev_ctx->intf->pfault) {
  76                         if (priv->pfault) {
  77                                 mlx5_core_err(dev, "multiple page fault handlers not supported");
  78                         } else {
  79                                 priv->pfault_ctx = dev_ctx->context;
  80                                 priv->pfault = dev_ctx->intf->pfault;
  81                         }
  82                 }
  83 #endif
  84                 spin_unlock_irq(&priv->ctx_lock);
  85         } else {
  86                 kfree(dev_ctx);
  87         }
  88 }
  89
  90 static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
  91                                                    struct mlx5_priv *priv)
  92 {
  93         struct mlx5_device_context *dev_ctx;
  94
  95         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
  96                 if (dev_ctx->intf == intf)
  97                         return dev_ctx;
  98         return NULL;
  99 }
 100
 101 void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
 102 {
 103         struct mlx5_device_context *dev_ctx;
 104         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 105
 106         dev_ctx = mlx5_get_device(intf, priv);
 107         if (!dev_ctx)
 108                 return;
 109
 110 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 111         spin_lock_irq(&priv->ctx_lock);
 112         if (priv->pfault == dev_ctx->intf->pfault)
 113                 priv->pfault = NULL;
 114         spin_unlock_irq(&priv->ctx_lock);
 115
 116         synchronize_srcu(&priv->pfault_srcu);
 117 #endif
 118
 119         spin_lock_irq(&priv->ctx_lock);
 120         list_del(&dev_ctx->list);
 121         spin_unlock_irq(&priv->ctx_lock);
 122
 123         if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 124                 intf->remove(dev, dev_ctx->context);
 125
 126         kfree(dev_ctx);
 127 }
 128
 129 static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 130 {
 131         struct mlx5_device_context *dev_ctx;
 132         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 133
 134         dev_ctx = mlx5_get_device(intf, priv);
 135         if (!dev_ctx)
 136                 return;
 137
 138         if (intf->attach) {
 139                 if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 140                         return;
 141                 intf->attach(dev, dev_ctx->context);
 142                 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 143         } else {
 144                 if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 145                         return;
 146                 dev_ctx->context = intf->add(dev);
 147                 set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 148         }
 149 }
 150
 151 void mlx5_attach_device(struct mlx5_core_dev *dev)
 152 {
 153         struct mlx5_priv *priv = &dev->priv;
 154         struct mlx5_interface *intf;
 155
 156         mutex_lock(&mlx5_intf_mutex);
 157         list_for_each_entry(intf, &intf_list, list)
 158                 mlx5_attach_interface(intf, priv);
 159         mutex_unlock(&mlx5_intf_mutex);
 160 }
 161
 162 static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 163 {
 164         struct mlx5_device_context *dev_ctx;
 165         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 166
 167         dev_ctx = mlx5_get_device(intf, priv);
 168         if (!dev_ctx)
 169                 return;
 170
 171         if (intf->detach) {
 172                 if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 173                         return;
 174                 intf->detach(dev, dev_ctx->context);
 175                 clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 176         } else {
 177                 if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 178                         return;
 179                 intf->remove(dev, dev_ctx->context);
 180                 clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 181         }
 182 }
 183
 184 void mlx5_detach_device(struct mlx5_core_dev *dev)
 185 {
 186         struct mlx5_priv *priv = &dev->priv;
 187         struct mlx5_interface *intf;
 188
 189         mutex_lock(&mlx5_intf_mutex);
 190         list_for_each_entry(intf, &intf_list, list)
 191                 mlx5_detach_interface(intf, priv);
 192         mutex_unlock(&mlx5_intf_mutex);
 193 }
 194
 195 bool mlx5_device_registered(struct mlx5_core_dev *dev)
 196 {
 197         struct mlx5_priv *priv;
 198         bool found = false;
 199
 200         mutex_lock(&mlx5_intf_mutex);
 201         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 202                 if (priv == &dev->priv)
 203                         found = true;
 204         mutex_unlock(&mlx5_intf_mutex);
 205
 206         return found;
 207 }
 208
 209 int mlx5_register_device(struct mlx5_core_dev *dev)
 210 {
 211         struct mlx5_priv *priv = &dev->priv;
 212         struct mlx5_interface *intf;
 213
 214         mutex_lock(&mlx5_intf_mutex);
 215         list_add_tail(&priv->dev_list, &mlx5_dev_list);
 216         list_for_each_entry(intf, &intf_list, list)
 217                 mlx5_add_device(intf, priv);
 218         mutex_unlock(&mlx5_intf_mutex);
 219
 220         return 0;
 221 }
 222
 223 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 224 {
 225         struct mlx5_priv *priv = &dev->priv;
 226         struct mlx5_interface *intf;
 227
 228         mutex_lock(&mlx5_intf_mutex);
 229         list_for_each_entry(intf, &intf_list, list)
 230                 mlx5_remove_device(intf, priv);
 231         list_del(&priv->dev_list);
 232         mutex_unlock(&mlx5_intf_mutex);
 233 }
 234
 235 int mlx5_register_interface(struct mlx5_interface *intf)
 236 {
 237         struct mlx5_priv *priv;
 238
 239         if (!intf->add || !intf->remove)
 240                 return -EINVAL;
 241
 242         mutex_lock(&mlx5_intf_mutex);
 243         list_add_tail(&intf->list, &intf_list);
 244         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 245                 mlx5_add_device(intf, priv);
 246         mutex_unlock(&mlx5_intf_mutex);
 247
 248         return 0;
 249 }
 250 EXPORT_SYMBOL(mlx5_register_interface);
 251
 252 void mlx5_unregister_interface(struct mlx5_interface *intf)
 253 {
 254         struct mlx5_priv *priv;
 255
 256         mutex_lock(&mlx5_intf_mutex);
 257         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 258                 mlx5_remove_device(intf, priv);
 259         list_del(&intf->list);
 260         mutex_unlock(&mlx5_intf_mutex);
 261 }
 262 EXPORT_SYMBOL(mlx5_unregister_interface);
 263
 264 void *mlx5_get_protocol_dev(struct mlx5_core_dev *mdev, int protocol)
 265 {
 266         struct mlx5_priv *priv = &mdev->priv;
 267         struct mlx5_device_context *dev_ctx;
 268         unsigned long flags;
 269         void *result = NULL;
 270
 271         spin_lock_irqsave(&priv->ctx_lock, flags);
 272
 273         list_for_each_entry(dev_ctx, &mdev->priv.ctx_list, list)
 274                 if ((dev_ctx->intf->protocol == protocol) &&
 275                     dev_ctx->intf->get_dev) {
 276                         result = dev_ctx->intf->get_dev(dev_ctx->context);
 277                         break;
 278                 }
 279
 280         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 281
 282         return result;
 283 }
 284 EXPORT_SYMBOL(mlx5_get_protocol_dev);
 285
 286 /* Must be called with intf_mutex held */
 287 void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 288 {
 289         struct mlx5_interface *intf;
 290
 291         list_for_each_entry(intf, &intf_list, list)
 292                 if (intf->protocol == protocol) {
 293                         mlx5_add_device(intf, &dev->priv);
 294                         break;
 295                 }
 296 }
 297
 298 /* Must be called with intf_mutex held */
 299 void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 300 {
 301         struct mlx5_interface *intf;
 302
 303         list_for_each_entry(intf, &intf_list, list)
 304                 if (intf->protocol == protocol) {
 305                         mlx5_remove_device(intf, &dev->priv);
 306                         break;
 307                 }
 308 }
 309
 310 static u16 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
 311 {
 312         return (u16)((dev->pdev->bus->number << 8) |
 313                      PCI_SLOT(dev->pdev->devfn));
 314 }
 315
 316 /* Must be called with intf_mutex held */
 317 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 318 {
 319         u16 pci_id = mlx5_gen_pci_id(dev);
 320         struct mlx5_core_dev *res = NULL;
 321         struct mlx5_core_dev *tmp_dev;
 322         struct mlx5_priv *priv;
 323
 324         list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
 325                 tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
 326                 if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
 327                         res = tmp_dev;
 328                         break;
 329                 }
 330         }
 331
 332         return res;
 333 }
 334
 335 void mlx5_core_event(struct mlx5_core_dev *dev, enum mlx5_dev_event event,
 336                      unsigned long param)
 337 {
 338         struct mlx5_priv *priv = &dev->priv;
 339         struct mlx5_device_context *dev_ctx;
 340         unsigned long flags;
 341
 342         spin_lock_irqsave(&priv->ctx_lock, flags);
 343
 344         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 345                 if (dev_ctx->intf->event)
 346                         dev_ctx->intf->event(dev, dev_ctx->context, event, param);
 347
 348         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 349 }
 350
 351 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 352 void mlx5_core_page_fault(struct mlx5_core_dev *dev,
 353                           struct mlx5_pagefault *pfault)
 354 {
 355         struct mlx5_priv *priv = &dev->priv;
 356         int srcu_idx;
 357
 358         srcu_idx = srcu_read_lock(&priv->pfault_srcu);
 359         if (priv->pfault)
 360                 priv->pfault(dev, priv->pfault_ctx, pfault);
 361         srcu_read_unlock(&priv->pfault_srcu, srcu_idx);
 362 }
 363 #endif
 364
 365 void mlx5_dev_list_lock(void)
 366 {
 367         mutex_lock(&mlx5_intf_mutex);
 368 }
 369
 370 void mlx5_dev_list_unlock(void)
 371 {
 372         mutex_unlock(&mlx5_intf_mutex);
 373 }
 374
 375 int mlx5_dev_list_trylock(void)
 376 {
 377         return mutex_trylock(&mlx5_intf_mutex);
 378 }