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/*
* 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;
};
enum {
MLX5_INTERFACE_ADDED,
MLX5_INTERFACE_ATTACHED,
};
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;
dev_ctx->context = intf->add(dev);
if (dev_ctx->context) {
set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
if (intf->attach)
set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
spin_lock_irq(&priv->ctx_lock);
list_add_tail(&dev_ctx->list, &priv->ctx_list);
spin_unlock_irq(&priv->ctx_lock);
}
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;
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;
if (intf->attach) {
if (test_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state))
return;
if (intf->attach(dev, dev_ctx->context))
return;
set_bit(MLX5_INTERFACE_ATTACHED, &dev_ctx->state);
} else {
if (test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
return;
dev_ctx->context = intf->add(dev);
if (!dev_ctx->context)
return;
set_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state);
}
}
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_reverse(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);
/* Must be called with intf_mutex held */
static bool mlx5_has_added_dev_by_protocol(struct mlx5_core_dev *mdev, int protocol)
{
struct mlx5_device_context *dev_ctx;
struct mlx5_interface *intf;
bool found = false;
list_for_each_entry(intf, &intf_list, list) {
if (intf->protocol == protocol) {
dev_ctx = mlx5_get_device(intf, &mdev->priv);
if (dev_ctx && test_bit(MLX5_INTERFACE_ADDED, &dev_ctx->state))
found = true;
break;
}
}
return found;
}
void mlx5_reload_interface(struct mlx5_core_dev *mdev, int protocol)
{
mutex_lock(&mlx5_intf_mutex);
if (mlx5_has_added_dev_by_protocol(mdev, protocol)) {
mlx5_remove_dev_by_protocol(mdev, protocol);
mlx5_add_dev_by_protocol(mdev, protocol);
}
mutex_unlock(&mlx5_intf_mutex);
}
/* 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 u32 mlx5_gen_pci_id(struct mlx5_core_dev *dev)
{
return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
(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)
{
struct mlx5_core_dev *res = NULL;
struct mlx5_core_dev *tmp_dev;
struct mlx5_priv *priv;
u32 pci_id;
if (!mlx5_core_is_pf(dev))
return NULL;
pci_id = mlx5_gen_pci_id(dev);
list_for_each_entry(priv, &mlx5_dev_list, dev_list) {
tmp_dev = container_of(priv, struct mlx5_core_dev, priv);
if (!mlx5_core_is_pf(tmp_dev))
continue;
if ((dev != tmp_dev) && (mlx5_gen_pci_id(tmp_dev) == pci_id)) {
res = tmp_dev;
break;
}
}
return res;
}
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);
}