/*
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* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/mlx5/driver.h>
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#include "mlx5_core.h"
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static LIST_HEAD(intf_list);
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static LIST_HEAD(mlx5_dev_list);
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/* intf dev list mutex */
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static DEFINE_MUTEX(mlx5_intf_mutex);
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struct mlx5_device_context {
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struct list_head list;
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struct mlx5_interface *intf;
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void *context;
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unsigned long state;
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};
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enum {
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MLX5_INTERFACE_ADDED,
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MLX5_INTERFACE_ATTACHED,
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};
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void mlx5_add_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
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{
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struct mlx5_device_context *dev_ctx;
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struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
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if (!mlx5_lag_intf_add(intf, priv))
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return;
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dev_ctx = kzalloc(sizeof(*dev_ctx), GFP_KERNEL);
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if (!dev_ctx)
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return;
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dev_ctx->intf = intf;
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dev_ctx->context = intf->add(dev);
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if (dev_ctx->context) {
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set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
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if (intf->attach)
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set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
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spin_lock_irq(&priv->ctx_lock);
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list_add_tail(&dev_ctx->list, &priv->ctx_list);
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spin_unlock_irq(&priv->ctx_lock);
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}
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if (!dev_ctx->context)
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kfree(dev_ctx);
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}
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static struct mlx5_device_context *mlx5_get_device(struct mlx5_interface *intf,
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struct mlx5_priv *priv)
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{
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struct mlx5_device_context *dev_ctx;
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list_for_each_entry(dev_ctx, &priv->ctx_list, list)
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if (dev_ctx->intf == intf)
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return dev_ctx;
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return NULL;
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}
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void mlx5_remove_device(struct mlx5_interface *intf, struct mlx5_priv *priv)
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{
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struct mlx5_device_context *dev_ctx;
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struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
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dev_ctx = mlx5_get_device(intf, priv);
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if (!dev_ctx)
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return;
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spin_lock_irq(&priv->ctx_lock);
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list_del(&dev_ctx->list);
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spin_unlock_irq(&priv->ctx_lock);
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if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
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intf->remove(dev, dev_ctx->context);
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kfree(dev_ctx);
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}
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static void mlx5_attach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
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{
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struct mlx5_device_context *dev_ctx;
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struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
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dev_ctx = mlx5_get_device(intf, priv);
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if (!dev_ctx)
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return;
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if (intf->attach) {
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if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
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return;
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if (intf->attach(dev, dev_ctx->context))
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return;
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set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
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} else {
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if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
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return;
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dev_ctx->context = intf->add(dev);
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if (!dev_ctx->context)
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return;
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set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
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}
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}
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void mlx5_attach_device(struct mlx5_core_dev *dev)
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{
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struct mlx5_priv *priv = &dev->priv;
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struct mlx5_interface *intf;
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mutex_lock(&mlx5_intf_mutex);
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list_for_each_entry(intf, &intf_list, list)
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mlx5_attach_interface(intf, priv);
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mutex_unlock(&mlx5_intf_mutex);
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}
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static void mlx5_detach_interface(struct mlx5_interface *intf, struct mlx5_priv *priv)
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{
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struct mlx5_device_context *dev_ctx;
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struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev, priv);
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dev_ctx = mlx5_get_device(intf, priv);
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if (!dev_ctx)
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return;
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if (intf->detach) {
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if (!test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
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return;
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intf->detach(dev, dev_ctx->context);
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clear_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
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} else {
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if (!test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
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return;
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intf->remove(dev, dev_ctx->context);
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clear_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
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}
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}
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void mlx5_detach_device(struct mlx5_core_dev *dev)
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{
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struct mlx5_priv *priv = &dev->priv;
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struct mlx5_interface *intf;
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mutex_lock(&mlx5_intf_mutex);
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list_for_each_entry(intf, &intf_list, list)
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mlx5_detach_interface(intf, priv);
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mutex_unlock(&mlx5_intf_mutex);
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}
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bool mlx5_device_registered(struct mlx5_core_dev *dev)
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{
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struct mlx5_priv *priv;
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bool found = false;
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mutex_lock(&mlx5_intf_mutex);
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list_for_each_entry(priv, &mlx5_dev_list, dev_list)
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if (priv == &dev->priv)
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found = true;
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mutex_unlock(&mlx5_intf_mutex);
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return found;
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}
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void mlx5_register_device(struct mlx5_core_dev *dev)
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{
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struct mlx5_priv *priv = &dev->priv;
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struct mlx5_interface *intf;
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mutex_lock(&mlx5_intf_mutex);
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list_add_tail(&priv->dev_list, &mlx5_dev_list);
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list_for_each_entry(intf, &intf_list, list)
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mlx5_add_device(intf, priv);
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mutex_unlock(&mlx5_intf_mutex);
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}
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void mlx5_unregister_device(struct mlx5_core_dev *dev)
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{
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struct mlx5_priv *priv = &dev->priv;
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struct mlx5_interface *intf;
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mutex_lock(&mlx5_intf_mutex);
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list_for_each_entry_reverse(intf, &intf_list, list)
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mlx5_remove_device(intf, priv);
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list_del(&priv->dev_list);
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mutex_unlock(&mlx5_intf_mutex);
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}
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int mlx5_register_interface(struct mlx5_interface *intf)
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{
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struct mlx5_priv *priv;
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if (!intf->add || !intf->remove)
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return -EINVAL;
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mutex_lock(&mlx5_intf_mutex);
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list_add_tail(&intf->list, &intf_list);
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list_for_each_entry(priv, &mlx5_dev_list, dev_list)
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mlx5_add_device(intf, priv);
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mutex_unlock(&mlx5_intf_mutex);
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return 0;
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}
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EXPORT_SYMBOL(mlx5_register_interface);
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void mlx5_unregister_interface(struct mlx5_interface *intf)
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{
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struct mlx5_priv *priv;
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mutex_lock(&mlx5_intf_mutex);
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list_for_each_entry(priv, &mlx5_dev_list, dev_list)
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mlx5_remove_device(intf, priv);
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list_del(&intf->list);
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mutex_unlock(&mlx5_intf_mutex);
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}
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EXPORT_SYMBOL(mlx5_unregister_interface);
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/* Must be called with intf_mutex held */
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static bool mlx5_has_added_dev_by_protocol(struct mlx5_core_dev *mdev, int protocol)
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{
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struct mlx5_device_context *dev_ctx;
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struct mlx5_interface *intf;
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bool found = false;
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list_for_each_entry(intf, &intf_list, list) {
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if (intf->protocol == protocol) {
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dev_ctx = mlx5_get_device(intf, &mdev->priv);
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if (dev_ctx && test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
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found = true;
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break;
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}
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}
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return found;
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}
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void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol)
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{
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mutex_lock(&mlx5_intf_mutex);
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if (mlx5_has_added_dev_by_protocol(mdev, protocol)) {
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mlx5_remove_dev_by_protocol(mdev, protocol);
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mlx5_add_dev_by_protocol(mdev, protocol);
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}
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mutex_unlock(&mlx5_intf_mutex);
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}
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/* Must be called with intf_mutex held */
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void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
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{
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struct mlx5_interface *intf;
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list_for_each_entry(intf, &intf_list, list)
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if (intf->protocol == protocol) {
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mlx5_add_device(intf, &dev->priv);
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break;
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}
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}
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/* Must be called with intf_mutex held */
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void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
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{
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struct mlx5_interface *intf;
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list_for_each_entry(intf, &intf_list, list)
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if (intf->protocol == protocol) {
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mlx5_remove_device(intf, &dev->priv);
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break;
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}
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}
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static u32 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
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{
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return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
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(dev->pdev->bus->number << 8) |
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PCI_SLOT(dev->pdev->devfn));
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}
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/* Must be called with intf_mutex held */
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struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
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{
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struct mlx5_core_dev *res = NULL;
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struct mlx5_core_dev *tmp_dev;
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struct mlx5_priv *priv;
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u32 pci_id;
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if (!mlx5_core_is_pf(dev))
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return NULL;
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pci_id = mlx5_gen_pci_id(dev);
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list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
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tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
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if (!mlx5_core_is_pf(tmp_dev))
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continue;
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if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
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res = tmp_dev;
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break;
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}
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}
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return res;
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}
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void mlx5_dev_list_lock(void)
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{
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mutex_lock(&mlx5_intf_mutex);
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}
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void mlx5_dev_list_unlock(void)
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{
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mutex_unlock(&mlx5_intf_mutex);
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}
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int mlx5_dev_list_trylock(void)
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{
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return mutex_trylock(&mlx5_intf_mutex);
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}
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