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 struct mlx5_delayed_event {
  49         struct list_head        list;
  50         struct mlx5_core_dev    *dev;
  51         enum mlx5_dev_event     event;
  52         unsigned long           param;
  53 };
  54
  55 enum {
  56         MLX5_INTERFACE_ADDED,
  57         MLX5_INTERFACE_ATTACHED,
  58 };
  59
  60 static void add_delayed_event(struct mlx5_priv *priv,
  61                               struct mlx5_core_dev *dev,
  62                               enum mlx5_dev_event event,
  63                               unsigned long param)
  64 {
  65         struct mlx5_delayed_event *delayed_event;
  66
  67         delayed_event = kzalloc(sizeof(*delayed_event), GFP_ATOMIC);
  68         if (!delayed_event) {
  69                 mlx5_core_err(dev, "event %d is missed\n", event);
  70                 return;
  71         }
  72
  73         mlx5_core_dbg(dev, "Accumulating event %d\n", event);
  74         delayed_event->dev = dev;
  75         delayed_event->event = event;
  76         delayed_event->param = param;
  77         list_add_tail(&delayed_event->list, &priv->waiting_events_list);
  78 }
  79
  80 static void delayed_event_release(struct mlx5_device_context *dev_ctx,
  81                                   struct mlx5_priv *priv)
  82 {
  83         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
  84         struct mlx5_delayed_event *de;
  85         struct mlx5_delayed_event *n;
  86         struct list_head temp;
  87
  88         INIT_LIST_HEAD(&temp);
  89
  90         spin_lock_irq(&priv->ctx_lock);
  91
  92         priv->is_accum_events = false;
  93         list_splice_init(&priv->waiting_events_list, &temp);
  94         if (!dev_ctx->context)
  95                 goto out;
  96         list_for_each_entry_safe(de, n, &temp, list)
  97                 dev_ctx->intf->event(dev, dev_ctx->context, de->event, de->param);
  98
  99 out:
 100         spin_unlock_irq(&priv->ctx_lock);
 101
 102         list_for_each_entry_safe(de, n, &temp, list) {
 103                 list_del(&de->list);
 104                 kfree(de);
 105         }
 106 }
 107
 108 /* accumulating events that can come after mlx5_ib calls to
 109  * ib_register_device, till adding that interface to the events list.
 110  */
 111 static void delayed_event_start(struct mlx5_priv *priv)
 112 {
 113         spin_lock_irq(&priv->ctx_lock);
 114         priv->is_accum_events = true;
 115         spin_unlock_irq(&priv->ctx_lock);
 116 }
 117
 118 void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
 119 {
 120         struct mlx5_device_context *dev_ctx;
 121         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 122
 123         if (!mlx5_lag_intf_add(intf, priv))
 124                 return;
 125
 126         dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
 127         if (!dev_ctx)
 128                 return;
 129
 130         dev_ctx->intf = intf;
 131
 132         delayed_event_start(priv);
 133
 134         dev_ctx->context = intf->add(dev);
 135         set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 136         if (intf->attach)
 137                 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 138
 139         if (dev_ctx->context) {
 140                 spin_lock_irq(&priv->ctx_lock);
 141                 list_add_tail(&dev_ctx->list, &priv->ctx_list);
 142
 143 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 144                 if (dev_ctx->intf->pfault) {
 145                         if (priv->pfault) {
 146                                 mlx5_core_err(dev, "multiple page fault handlers not supported");
 147                         } else {
 148                                 priv->pfault_ctx = dev_ctx->context;
 149                                 priv->pfault = dev_ctx->intf->pfault;
 150                         }
 151                 }
 152 #endif
 153                 spin_unlock_irq(&priv->ctx_lock);
 154         }
 155
 156         delayed_event_release(dev_ctx, priv);
 157
 158         if (!dev_ctx->context)
 159                 kfree(dev_ctx);
 160 }
 161
 162 static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
 163                                                    struct mlx5_priv *priv)
 164 {
 165         struct mlx5_device_context *dev_ctx;
 166
 167         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 168                 if (dev_ctx->intf == intf)
 169                         return dev_ctx;
 170         return NULL;
 171 }
 172
 173 void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
 174 {
 175         struct mlx5_device_context *dev_ctx;
 176         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 177
 178         dev_ctx = mlx5_get_device(intf, priv);
 179         if (!dev_ctx)
 180                 return;
 181
 182 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 183         spin_lock_irq(&priv->ctx_lock);
 184         if (priv->pfault == dev_ctx->intf->pfault)
 185                 priv->pfault = NULL;
 186         spin_unlock_irq(&priv->ctx_lock);
 187
 188         synchronize_srcu(&priv->pfault_srcu);
 189 #endif
 190
 191         spin_lock_irq(&priv->ctx_lock);
 192         list_del(&dev_ctx->list);
 193         spin_unlock_irq(&priv->ctx_lock);
 194
 195         if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 196                 intf->remove(dev, dev_ctx->context);
 197
 198         kfree(dev_ctx);
 199 }
 200
 201 static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 202 {
 203         struct mlx5_device_context *dev_ctx;
 204         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 205
 206         dev_ctx = mlx5_get_device(intf, priv);
 207         if (!dev_ctx)
 208                 return;
 209
 210         delayed_event_start(priv);
 211         if (intf->attach) {
 212                 if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 213                         goto out;
 214                 intf->attach(dev, dev_ctx->context);
 215                 set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 216         } else {
 217                 if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 218                         goto out;
 219                 dev_ctx->context = intf->add(dev);
 220                 set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 221         }
 222
 223 out:
 224         delayed_event_release(dev_ctx, priv);
 225 }
 226
 227 void mlx5_attach_device(struct mlx5_core_dev *dev)
 228 {
 229         struct mlx5_priv *priv = &dev->priv;
 230         struct mlx5_interface *intf;
 231
 232         mutex_lock(&mlx5_intf_mutex);
 233         list_for_each_entry(intf, &intf_list, list)
 234                 mlx5_attach_interface(intf, priv);
 235         mutex_unlock(&mlx5_intf_mutex);
 236 }
 237
 238 static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 239 {
 240         struct mlx5_device_context *dev_ctx;
 241         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 242
 243         dev_ctx = mlx5_get_device(intf, priv);
 244         if (!dev_ctx)
 245                 return;
 246
 247         if (intf->detach) {
 248                 if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 249                         return;
 250                 intf->detach(dev, dev_ctx->context);
 251                 clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 252         } else {
 253                 if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 254                         return;
 255                 intf->remove(dev, dev_ctx->context);
 256                 clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 257         }
 258 }
 259
 260 void mlx5_detach_device(struct mlx5_core_dev *dev)
 261 {
 262         struct mlx5_priv *priv = &dev->priv;
 263         struct mlx5_interface *intf;
 264
 265         mutex_lock(&mlx5_intf_mutex);
 266         list_for_each_entry(intf, &intf_list, list)
 267                 mlx5_detach_interface(intf, priv);
 268         mutex_unlock(&mlx5_intf_mutex);
 269 }
 270
 271 bool mlx5_device_registered(struct mlx5_core_dev *dev)
 272 {
 273         struct mlx5_priv *priv;
 274         bool found = false;
 275
 276         mutex_lock(&mlx5_intf_mutex);
 277         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 278                 if (priv == &dev->priv)
 279                         found = true;
 280         mutex_unlock(&mlx5_intf_mutex);
 281
 282         return found;
 283 }
 284
 285 int mlx5_register_device(struct mlx5_core_dev *dev)
 286 {
 287         struct mlx5_priv *priv = &dev->priv;
 288         struct mlx5_interface *intf;
 289
 290         mutex_lock(&mlx5_intf_mutex);
 291         list_add_tail(&priv->dev_list, &mlx5_dev_list);
 292         list_for_each_entry(intf, &intf_list, list)
 293                 mlx5_add_device(intf, priv);
 294         mutex_unlock(&mlx5_intf_mutex);
 295
 296         return 0;
 297 }
 298
 299 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 300 {
 301         struct mlx5_priv *priv = &dev->priv;
 302         struct mlx5_interface *intf;
 303
 304         mutex_lock(&mlx5_intf_mutex);
 305         list_for_each_entry(intf, &intf_list, list)
 306                 mlx5_remove_device(intf, priv);
 307         list_del(&priv->dev_list);
 308         mutex_unlock(&mlx5_intf_mutex);
 309 }
 310
 311 int mlx5_register_interface(struct mlx5_interface *intf)
 312 {
 313         struct mlx5_priv *priv;
 314
 315         if (!intf->add || !intf->remove)
 316                 return -EINVAL;
 317
 318         mutex_lock(&mlx5_intf_mutex);
 319         list_add_tail(&intf->list, &intf_list);
 320         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 321                 mlx5_add_device(intf, priv);
 322         mutex_unlock(&mlx5_intf_mutex);
 323
 324         return 0;
 325 }
 326 EXPORT_SYMBOL(mlx5_register_interface);
 327
 328 void mlx5_unregister_interface(struct mlx5_interface *intf)
 329 {
 330         struct mlx5_priv *priv;
 331
 332         mutex_lock(&mlx5_intf_mutex);
 333         list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 334                 mlx5_remove_device(intf, priv);
 335         list_del(&intf->list);
 336         mutex_unlock(&mlx5_intf_mutex);
 337 }
 338 EXPORT_SYMBOL(mlx5_unregister_interface);
 339
 340 void *mlx5_get_protocol_dev(struct mlx5_core_dev *mdev, int protocol)
 341 {
 342         struct mlx5_priv *priv = &mdev->priv;
 343         struct mlx5_device_context *dev_ctx;
 344         unsigned long flags;
 345         void *result = NULL;
 346
 347         spin_lock_irqsave(&priv->ctx_lock, flags);
 348
 349         list_for_each_entry(dev_ctx, &mdev->priv.ctx_list, list)
 350                 if ((dev_ctx->intf->protocol == protocol) &&
 351                     dev_ctx->intf->get_dev) {
 352                         result = dev_ctx->intf->get_dev(dev_ctx->context);
 353                         break;
 354                 }
 355
 356         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 357
 358         return result;
 359 }
 360 EXPORT_SYMBOL(mlx5_get_protocol_dev);
 361
 362 /* Must be called with intf_mutex held */
 363 void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 364 {
 365         struct mlx5_interface *intf;
 366
 367         list_for_each_entry(intf, &intf_list, list)
 368                 if (intf->protocol == protocol) {
 369                         mlx5_add_device(intf, &dev->priv);
 370                         break;
 371                 }
 372 }
 373
 374 /* Must be called with intf_mutex held */
 375 void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 376 {
 377         struct mlx5_interface *intf;
 378
 379         list_for_each_entry(intf, &intf_list, list)
 380                 if (intf->protocol == protocol) {
 381                         mlx5_remove_device(intf, &dev->priv);
 382                         break;
 383                 }
 384 }
 385
 386 static u16 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
 387 {
 388         return (u16)((dev->pdev->bus->number << 8) |
 389                      PCI_SLOT(dev->pdev->devfn));
 390 }
 391
 392 /* Must be called with intf_mutex held */
 393 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 394 {
 395         u16 pci_id = mlx5_gen_pci_id(dev);
 396         struct mlx5_core_dev *res = NULL;
 397         struct mlx5_core_dev *tmp_dev;
 398         struct mlx5_priv *priv;
 399
 400         list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
 401                 tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
 402                 if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
 403                         res = tmp_dev;
 404                         break;
 405                 }
 406         }
 407
 408         return res;
 409 }
 410
 411 void mlx5_core_event(struct mlx5_core_dev *dev, enum mlx5_dev_event event,
 412                      unsigned long param)
 413 {
 414         struct mlx5_priv *priv = &dev->priv;
 415         struct mlx5_device_context *dev_ctx;
 416         unsigned long flags;
 417
 418         spin_lock_irqsave(&priv->ctx_lock, flags);
 419
 420         if (priv->is_accum_events)
 421                 add_delayed_event(priv, dev, event, param);
 422
 423         /* After mlx5_detach_device, the dev_ctx->intf is still set and dev_ctx is
 424          * still in priv->ctx_list. In this case, only notify the dev_ctx if its
 425          * ADDED or ATTACHED bit are set.
 426          */
 427         list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 428                 if (dev_ctx->intf->event &&
 429                     (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state) ||
 430                      test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state)))
 431                         dev_ctx->intf->event(dev, dev_ctx->context, event, param);
 432
 433         spin_unlock_irqrestore(&priv->ctx_lock, flags);
 434 }
 435
 436 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 437 void mlx5_core_page_fault(struct mlx5_core_dev *dev,
 438                           struct mlx5_pagefault *pfault)
 439 {
 440         struct mlx5_priv *priv = &dev->priv;
 441         int srcu_idx;
 442
 443         srcu_idx = srcu_read_lock(&priv->pfault_srcu);
 444         if (priv->pfault)
 445                 priv->pfault(dev, priv->pfault_ctx, pfault);
 446         srcu_read_unlock(&priv->pfault_srcu, srcu_idx);
 447 }
 448 #endif
 449
 450 void mlx5_dev_list_lock(void)
 451 {
 452         mutex_lock(&mlx5_intf_mutex);
 453 }
 454
 455 void mlx5_dev_list_unlock(void)
 456 {
 457         mutex_unlock(&mlx5_intf_mutex);
 458 }
 459
 460 int mlx5_dev_list_trylock(void)
 461 {
 462         return mutex_trylock(&mlx5_intf_mutex);
 463 }