drivers/net/ethernet/mellanox/mlx5/core/dev.c - linux - Git at Google

 /*
  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - Redistributions in binary form must reproduce the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer in the documentation and/or other materials
  *        provided with the distribution.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */

 #include <linux/mlx5/driver.h>
 #include "mlx5_core.h"

 static LIST_HEAD(intf_list);
 static LIST_HEAD(mlx5_dev_list);
 /* intf dev list mutex */
 static DEFINE_MUTEX(mlx5_intf_mutex);

 struct mlx5_device_context {
 	struct list_head	list;
 	struct mlx5_interface  *intf;
 	void		       *context;
 	unsigned long		state;
 };

 struct mlx5_delayed_event {
 	struct list_head	list;
 	struct mlx5_core_dev	*dev;
 	enum mlx5_dev_event	event;
 	unsigned long		param;
 };

 enum {
 	MLX5_INTERFACE_ADDED,
 	MLX5_INTERFACE_ATTACHED,
 };

 static void add_delayed_event(struct mlx5_priv *priv,
 			      struct mlx5_core_dev *dev,
 			      enum mlx5_dev_event event,
 			      unsigned long param)
 {
 	struct mlx5_delayed_event *delayed_event;

 	delayed_event = kzalloc(sizeof(*delayed_event), GFP_ATOMIC);
 	if (!delayed_event) {
 		mlx5_core_err(dev, "event %d is missed\n", event);
 		return;
 	}

 	mlx5_core_dbg(dev, "Accumulating event %d\n", event);
 	delayed_event->dev = dev;
 	delayed_event->event = event;
 	delayed_event->param = param;
 	list_add_tail(&delayed_event->list, &priv->waiting_events_list);
 }

 static void delayed_event_release(struct mlx5_device_context *dev_ctx,
 				  struct mlx5_priv *priv)
 {
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
 	struct mlx5_delayed_event *de;
 	struct mlx5_delayed_event *n;
 	struct list_head temp;

 	INIT_LIST_HEAD(&temp);

 	spin_lock_irq(&priv->ctx_lock);

 	priv->is_accum_events = false;
 	list_splice_init(&priv->waiting_events_list, &temp);
 	if (!dev_ctx->context)
 		goto out;
 	list_for_each_entry_safe(de, n, &temp, list)
 		dev_ctx->intf->event(dev, dev_ctx->context, de->event, de->param);

 out:
 	spin_unlock_irq(&priv->ctx_lock);

 	list_for_each_entry_safe(de, n, &temp, list) {
 		list_del(&de->list);
 		kfree(de);
 	}
 }

 /* accumulating events that can come after mlx5_ib calls to
  * ib_register_device, till adding that interface to the events list.
  */
 static void delayed_event_start(struct mlx5_priv *priv)
 {
 	spin_lock_irq(&priv->ctx_lock);
 	priv->is_accum_events = true;
 	spin_unlock_irq(&priv->ctx_lock);
 }

 void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	if (!mlx5_lag_intf_add(intf, priv))
 		return;

 	dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
 	if (!dev_ctx)
 		return;

 	dev_ctx->intf = intf;

 	delayed_event_start(priv);

 	dev_ctx->context = intf->add(dev);
 	set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 	if (intf->attach)
 		set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);

 	if (dev_ctx->context) {
 		spin_lock_irq(&priv->ctx_lock);
 		list_add_tail(&dev_ctx->list, &priv->ctx_list);

 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 		if (dev_ctx->intf->pfault) {
 			if (priv->pfault) {
 				mlx5_core_err(dev, "multiple page fault handlers not supported");
 			} else {
 				priv->pfault_ctx = dev_ctx->context;
 				priv->pfault = dev_ctx->intf->pfault;
 			}
 		}
 #endif
 		spin_unlock_irq(&priv->ctx_lock);
 	}

 	delayed_event_release(dev_ctx, priv);

 	if (!dev_ctx->context)
 		kfree(dev_ctx);
 }

 static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
 						   struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;

 	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 		if (dev_ctx->intf == intf)
 			return dev_ctx;
 	return NULL;
 }

 void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	dev_ctx = mlx5_get_device(intf, priv);
 	if (!dev_ctx)
 		return;

 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 	spin_lock_irq(&priv->ctx_lock);
 	if (priv->pfault == dev_ctx->intf->pfault)
 		priv->pfault = NULL;
 	spin_unlock_irq(&priv->ctx_lock);

 	synchronize_srcu(&priv->pfault_srcu);
 #endif

 	spin_lock_irq(&priv->ctx_lock);
 	list_del(&dev_ctx->list);
 	spin_unlock_irq(&priv->ctx_lock);

 	if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 		intf->remove(dev, dev_ctx->context);

 	kfree(dev_ctx);
 }

 static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	dev_ctx = mlx5_get_device(intf, priv);
 	if (!dev_ctx)
 		return;

 	delayed_event_start(priv);
 	if (intf->attach) {
 		if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 			goto out;
 		intf->attach(dev, dev_ctx->context);
 		set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 	} else {
 		if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 			goto out;
 		dev_ctx->context = intf->add(dev);
 		set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 	}

 out:
 	delayed_event_release(dev_ctx, priv);
 }

 void mlx5_attach_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_attach_interface(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);
 }

 static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
 {
 	struct mlx5_device_context *dev_ctx;
 	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

 	dev_ctx = mlx5_get_device(intf, priv);
 	if (!dev_ctx)
 		return;

 	if (intf->detach) {
 		if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
 			return;
 		intf->detach(dev, dev_ctx->context);
 		clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
 	} else {
 		if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
 			return;
 		intf->remove(dev, dev_ctx->context);
 		clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
 	}
 }

 void mlx5_detach_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_detach_interface(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);
 }

 bool mlx5_device_registered(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv;
 	bool found = false;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		if (priv == &dev->priv)
 			found = true;
 	mutex_unlock(&mlx5_intf_mutex);

 	return found;
 }

 int mlx5_register_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_add_tail(&priv->dev_list, &mlx5_dev_list);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_add_device(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);

 	return 0;
 }

 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_remove_device(intf, priv);
 	list_del(&priv->dev_list);
 	mutex_unlock(&mlx5_intf_mutex);
 }

 int mlx5_register_interface(struct mlx5_interface *intf)
 {
 	struct mlx5_priv *priv;

 	if (!intf->add || !intf->remove)
 		return -EINVAL;

 	mutex_lock(&mlx5_intf_mutex);
 	list_add_tail(&intf->list, &intf_list);
 	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		mlx5_add_device(intf, priv);
 	mutex_unlock(&mlx5_intf_mutex);

 	return 0;
 }
 EXPORT_SYMBOL(mlx5_register_interface);

 void mlx5_unregister_interface(struct mlx5_interface *intf)
 {
 	struct mlx5_priv *priv;

 	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		mlx5_remove_device(intf, priv);
 	list_del(&intf->list);
 	mutex_unlock(&mlx5_intf_mutex);
 }
 EXPORT_SYMBOL(mlx5_unregister_interface);

 void *mlx5_get_protocol_dev(struct mlx5_core_dev *mdev, int protocol)
 {
 	struct mlx5_priv *priv = &mdev->priv;
 	struct mlx5_device_context *dev_ctx;
 	unsigned long flags;
 	void *result = NULL;

 	spin_lock_irqsave(&priv->ctx_lock, flags);

 	list_for_each_entry(dev_ctx, &mdev->priv.ctx_list, list)
 		if ((dev_ctx->intf->protocol == protocol) &&
 		    dev_ctx->intf->get_dev) {
 			result = dev_ctx->intf->get_dev(dev_ctx->context);
 			break;
 		}

 	spin_unlock_irqrestore(&priv->ctx_lock, flags);

 	return result;
 }
 EXPORT_SYMBOL(mlx5_get_protocol_dev);

 /* Must be called with intf_mutex held */
 void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 {
 	struct mlx5_interface *intf;

 	list_for_each_entry(intf, &intf_list, list)
 		if (intf->protocol == protocol) {
 			mlx5_add_device(intf, &dev->priv);
 			break;
 		}
 }

 /* Must be called with intf_mutex held */
 void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
 {
 	struct mlx5_interface *intf;

 	list_for_each_entry(intf, &intf_list, list)
 		if (intf->protocol == protocol) {
 			mlx5_remove_device(intf, &dev->priv);
 			break;
 		}
 }

 static u16 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
 {
 	return (u16)((dev->pdev->bus->number << 8) |
 		     PCI_SLOT(dev->pdev->devfn));
 }

 /* Must be called with intf_mutex held */
 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 {
 	u16 pci_id = mlx5_gen_pci_id(dev);
 	struct mlx5_core_dev *res = NULL;
 	struct mlx5_core_dev *tmp_dev;
 	struct mlx5_priv *priv;

 	list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
 		tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
 		if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
 			res = tmp_dev;
 			break;
 		}
 	}

 	return res;
 }

 void mlx5_core_event(struct mlx5_core_dev *dev, enum mlx5_dev_event event,
 		     unsigned long param)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_device_context *dev_ctx;
 	unsigned long flags;

 	spin_lock_irqsave(&priv->ctx_lock, flags);

 	if (priv->is_accum_events)
 		add_delayed_event(priv, dev, event, param);

 	/* After mlx5_detach_device, the dev_ctx->intf is still set and dev_ctx is
 	 * still in priv->ctx_list. In this case, only notify the dev_ctx if its
 	 * ADDED or ATTACHED bit are set.
 	 */
 	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
 		if (dev_ctx->intf->event &&
 		    (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state) ||
 		     test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state)))
 			dev_ctx->intf->event(dev, dev_ctx->context, event, param);

 	spin_unlock_irqrestore(&priv->ctx_lock, flags);
 }

 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 void mlx5_core_page_fault(struct mlx5_core_dev *dev,
 			  struct mlx5_pagefault *pfault)
 {
 	struct mlx5_priv *priv = &dev->priv;
 	int srcu_idx;

 	srcu_idx = srcu_read_lock(&priv->pfault_srcu);
 	if (priv->pfault)
 		priv->pfault(dev, priv->pfault_ctx, pfault);
 	srcu_read_unlock(&priv->pfault_srcu, srcu_idx);
 }
 #endif

 void mlx5_dev_list_lock(void)
 {
 	mutex_lock(&mlx5_intf_mutex);
 }

 void mlx5_dev_list_unlock(void)
 {
 	mutex_unlock(&mlx5_intf_mutex);
 }

 int mlx5_dev_list_trylock(void)
 {
 	return mutex_trylock(&mlx5_intf_mutex);
 }
	/*
	* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials
	* provided with the distribution.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*/

	#include <linux/mlx5/driver.h>
	#include "mlx5_core.h"

	static LIST_HEAD(intf_list);
	static LIST_HEAD(mlx5_dev_list);
	/* intf dev list mutex */
	static DEFINE_MUTEX(mlx5_intf_mutex);

	struct mlx5_device_context {
	struct list_head list;
	struct mlx5_interface *intf;
	void *context;
	unsigned long state;
	};

	struct mlx5_delayed_event {
	struct list_head list;
	struct mlx5_core_dev *dev;
	enum mlx5_dev_event event;
	unsigned long param;
	};

	enum {
	MLX5_INTERFACE_ADDED,
	MLX5_INTERFACE_ATTACHED,
	};

	static void add_delayed_event(struct mlx5_priv *priv,
	struct mlx5_core_dev *dev,
	enum mlx5_dev_event event,
	unsigned long param)
	{
	struct mlx5_delayed_event *delayed_event;

	delayed_event = kzalloc(sizeof(*delayed_event), GFP_ATOMIC);
	if (!delayed_event) {
	mlx5_core_err(dev, "event %d is missed\n", event);
	return;
	}

	mlx5_core_dbg(dev, "Accumulating event %d\n", event);
	delayed_event->dev = dev;
	delayed_event->event = event;
	delayed_event->param = param;
	list_add_tail(&delayed_event->list, &priv->waiting_events_list);
	}

	static void delayed_event_release(struct mlx5_device_context *dev_ctx,
	struct mlx5_priv *priv)
	{
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
	struct mlx5_delayed_event *de;
	struct mlx5_delayed_event *n;
	struct list_head temp;

	INIT_LIST_HEAD(&temp);

	spin_lock_irq(&priv->ctx_lock);

	priv->is_accum_events = false;
	list_splice_init(&priv->waiting_events_list, &temp);
	if (!dev_ctx->context)
	goto out;
	list_for_each_entry_safe(de, n, &temp, list)
	dev_ctx->intf->event(dev, dev_ctx->context, de->event, de->param);

	out:
	spin_unlock_irq(&priv->ctx_lock);

	list_for_each_entry_safe(de, n, &temp, list) {
	list_del(&de->list);
	kfree(de);
	}
	}

	/* accumulating events that can come after mlx5_ib calls to
	* ib_register_device, till adding that interface to the events list.
	*/
	static void delayed_event_start(struct mlx5_priv *priv)
	{
	spin_lock_irq(&priv->ctx_lock);
	priv->is_accum_events = true;
	spin_unlock_irq(&priv->ctx_lock);
	}

	void mlx5_add_device(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	if (!mlx5_lag_intf_add(intf, priv))
	return;

	dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
	if (!dev_ctx)
	return;

	dev_ctx->intf = intf;

	delayed_event_start(priv);

	dev_ctx->context = intf->add(dev);
	set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
	if (intf->attach)
	set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);

	if (dev_ctx->context) {
	spin_lock_irq(&priv->ctx_lock);
	list_add_tail(&dev_ctx->list, &priv->ctx_list);

	#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
	if (dev_ctx->intf->pfault) {
	if (priv->pfault) {
	mlx5_core_err(dev, "multiple page fault handlers not supported");
	} else {
	priv->pfault_ctx = dev_ctx->context;
	priv->pfault = dev_ctx->intf->pfault;
	}
	}
	#endif
	spin_unlock_irq(&priv->ctx_lock);
	}

	delayed_event_release(dev_ctx, priv);

	if (!dev_ctx->context)
	kfree(dev_ctx);
	}

	static struct mlx5_device_context mlx5_get_device(struct mlx5_interface intf,
	struct mlx5_priv *priv)
	{
	struct mlx5_device_context *dev_ctx;

	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
	if (dev_ctx->intf == intf)
	return dev_ctx;
	return NULL;
	}

	void mlx5_remove_device(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	dev_ctx = mlx5_get_device(intf, priv);
	if (!dev_ctx)
	return;

	#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
	spin_lock_irq(&priv->ctx_lock);
	if (priv->pfault == dev_ctx->intf->pfault)
	priv->pfault = NULL;
	spin_unlock_irq(&priv->ctx_lock);

	synchronize_srcu(&priv->pfault_srcu);
	#endif

	spin_lock_irq(&priv->ctx_lock);
	list_del(&dev_ctx->list);
	spin_unlock_irq(&priv->ctx_lock);

	if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
	intf->remove(dev, dev_ctx->context);

	kfree(dev_ctx);
	}

	static void mlx5_attach_interface(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	dev_ctx = mlx5_get_device(intf, priv);
	if (!dev_ctx)
	return;

	delayed_event_start(priv);
	if (intf->attach) {
	if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
	goto out;
	intf->attach(dev, dev_ctx->context);
	set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
	} else {
	if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
	goto out;
	dev_ctx->context = intf->add(dev);
	set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
	}

	out:
	delayed_event_release(dev_ctx, priv);
	}

	void mlx5_attach_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(intf, &intf_list, list)
	mlx5_attach_interface(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);
	}

	static void mlx5_detach_interface(struct mlx5_interface intf, struct mlx5_priv priv)
	{
	struct mlx5_device_context *dev_ctx;
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);

	dev_ctx = mlx5_get_device(intf, priv);
	if (!dev_ctx)
	return;

	if (intf->detach) {
	if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
	return;
	intf->detach(dev, dev_ctx->context);
	clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
	} else {
	if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
	return;
	intf->remove(dev, dev_ctx->context);
	clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
	}
	}

	void mlx5_detach_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(intf, &intf_list, list)
	mlx5_detach_interface(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);
	}

	bool mlx5_device_registered(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv;
	bool found = false;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
	if (priv == &dev->priv)
	found = true;
	mutex_unlock(&mlx5_intf_mutex);

	return found;
	}

	int mlx5_register_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_add_tail(&priv->dev_list, &mlx5_dev_list);
	list_for_each_entry(intf, &intf_list, list)
	mlx5_add_device(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);

	return 0;
	}

	void mlx5_unregister_device(struct mlx5_core_dev *dev)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_interface *intf;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(intf, &intf_list, list)
	mlx5_remove_device(intf, priv);
	list_del(&priv->dev_list);
	mutex_unlock(&mlx5_intf_mutex);
	}

	int mlx5_register_interface(struct mlx5_interface *intf)
	{
	struct mlx5_priv *priv;

	if (!intf->add \|\| !intf->remove)
	return -EINVAL;

	mutex_lock(&mlx5_intf_mutex);
	list_add_tail(&intf->list, &intf_list);
	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
	mlx5_add_device(intf, priv);
	mutex_unlock(&mlx5_intf_mutex);

	return 0;
	}
	EXPORT_SYMBOL(mlx5_register_interface);

	void mlx5_unregister_interface(struct mlx5_interface *intf)
	{
	struct mlx5_priv *priv;

	mutex_lock(&mlx5_intf_mutex);
	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
	mlx5_remove_device(intf, priv);
	list_del(&intf->list);
	mutex_unlock(&mlx5_intf_mutex);
	}
	EXPORT_SYMBOL(mlx5_unregister_interface);

	void mlx5_get_protocol_dev(struct mlx5_core_dev mdev, int protocol)
	{
	struct mlx5_priv *priv = &mdev->priv;
	struct mlx5_device_context *dev_ctx;
	unsigned long flags;
	void *result = NULL;

	spin_lock_irqsave(&priv->ctx_lock, flags);

	list_for_each_entry(dev_ctx, &mdev->priv.ctx_list, list)
	if ((dev_ctx->intf->protocol == protocol) &&
	dev_ctx->intf->get_dev) {
	result = dev_ctx->intf->get_dev(dev_ctx->context);
	break;
	}

	spin_unlock_irqrestore(&priv->ctx_lock, flags);

	return result;
	}
	EXPORT_SYMBOL(mlx5_get_protocol_dev);

	/* Must be called with intf_mutex held */
	void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
	{
	struct mlx5_interface *intf;

	list_for_each_entry(intf, &intf_list, list)
	if (intf->protocol == protocol) {
	mlx5_add_device(intf, &dev->priv);
	break;
	}
	}

	/* Must be called with intf_mutex held */
	void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
	{
	struct mlx5_interface *intf;

	list_for_each_entry(intf, &intf_list, list)
	if (intf->protocol == protocol) {
	mlx5_remove_device(intf, &dev->priv);
	break;
	}
	}

	static u16 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
	{
	return (u16)((dev->pdev->bus->number << 8) \|
	PCI_SLOT(dev->pdev->devfn));
	}

	/* Must be called with intf_mutex held */
	struct mlx5_core_dev mlx5_get_next_phys_dev(struct mlx5_core_dev dev)
	{
	u16 pci_id = mlx5_gen_pci_id(dev);
	struct mlx5_core_dev *res = NULL;
	struct mlx5_core_dev *tmp_dev;
	struct mlx5_priv *priv;

	list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
	tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
	if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
	res = tmp_dev;
	break;
	}
	}

	return res;
	}

	void mlx5_core_event(struct mlx5_core_dev *dev, enum mlx5_dev_event event,
	unsigned long param)
	{
	struct mlx5_priv *priv = &dev->priv;
	struct mlx5_device_context *dev_ctx;
	unsigned long flags;

	spin_lock_irqsave(&priv->ctx_lock, flags);

	if (priv->is_accum_events)
	add_delayed_event(priv, dev, event, param);

	/* After mlx5_detach_device, the dev_ctx->intf is still set and dev_ctx is
	* still in priv->ctx_list. In this case, only notify the dev_ctx if its
	* ADDED or ATTACHED bit are set.
	*/
	list_for_each_entry(dev_ctx, &priv->ctx_list, list)
	if (dev_ctx->intf->event &&
	(test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state) \|\|
	test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state)))
	dev_ctx->intf->event(dev, dev_ctx->context, event, param);

	spin_unlock_irqrestore(&priv->ctx_lock, flags);
	}

	#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
	void mlx5_core_page_fault(struct mlx5_core_dev *dev,
	struct mlx5_pagefault *pfault)
	{
	struct mlx5_priv *priv = &dev->priv;
	int srcu_idx;

	srcu_idx = srcu_read_lock(&priv->pfault_srcu);
	if (priv->pfault)
	priv->pfault(dev, priv->pfault_ctx, pfault);
	srcu_read_unlock(&priv->pfault_srcu, srcu_idx);
	}
	#endif

	void mlx5_dev_list_lock(void)
	{
	mutex_lock(&mlx5_intf_mutex);
	}

	void mlx5_dev_list_unlock(void)
	{
	mutex_unlock(&mlx5_intf_mutex);
	}

	int mlx5_dev_list_trylock(void)
	{
	return mutex_trylock(&mlx5_intf_mutex);
	}