/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2007, 2008 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/workqueue.h>
#include <linux/module.h>

#include "mlx4.h"

enum {
        MLX4_CATAS_POLL_INTERVAL        = 5 * HZ,
};

static DEFINE_SPINLOCK(catas_lock);

static LIST_HEAD(catas_list);
static struct work_struct catas_work;

static int internal_err_reset = 1;
module_param(internal_err_reset, int, 0644);
MODULE_PARM_DESC(internal_err_reset,
                 "Reset device on internal errors if non-zero"
                 " (default 1, in SRIOV mode default is 0)");

static void dump_err_buf(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);

        int i;

        mlx4_err(dev, "Internal error detected:\n");
        for (i = 0; i < priv->fw.catas_size; ++i)
                mlx4_err(dev, "  buf[%02x]: %08x\n",
                         i, swab32(readl(priv->catas_err.map + i)));
}

static void poll_catas(unsigned long dev_ptr)
{
        struct mlx4_dev *dev = (struct mlx4_dev *) dev_ptr;
        struct mlx4_priv *priv = mlx4_priv(dev);

        if (readl(priv->catas_err.map)) {
                /* If the device is off-line, we cannot try to recover it */
                if (pci_channel_offline(dev->pdev))
                        mod_timer(&priv->catas_err.timer,
                                  round_jiffies(jiffies + MLX4_CATAS_POLL_INTERVAL));
                else {
                        dump_err_buf(dev);
                        mlx4_dispatch_event(dev, MLX4_DEV_EVENT_CATASTROPHIC_ERROR, 0);

                        if (internal_err_reset) {
                                spin_lock(&catas_lock);
                                list_add(&priv->catas_err.list, &catas_list);
                                spin_unlock(&catas_lock);

                                queue_work(mlx4_wq, &catas_work);
                        }
                }
        } else
                mod_timer(&priv->catas_err.timer,
                          round_jiffies(jiffies + MLX4_CATAS_POLL_INTERVAL));
}

static void catas_reset(struct work_struct *work)
{
        struct mlx4_priv *priv, *tmppriv;
        struct mlx4_dev *dev;

        LIST_HEAD(tlist);
        int ret;

        spin_lock_irq(&catas_lock);
        list_splice_init(&catas_list, &tlist);
        spin_unlock_irq(&catas_lock);

        list_for_each_entry_safe(priv, tmppriv, &tlist, catas_err.list) {
                struct pci_dev *pdev = priv->dev.pdev;

                /* If the device is off-line, we cannot reset it */
                if (pci_channel_offline(pdev))
                        continue;

                ret = mlx4_restart_one(priv->dev.pdev);
                /* 'priv' now is not valid */
                if (ret)
                        pr_err("mlx4 %s: Reset failed (%d)\n",
                               pci_name(pdev), ret);
                else {
                        dev  = pci_get_drvdata(pdev);
                        mlx4_dbg(dev, "Reset succeeded\n");
                }
        }
}

void mlx4_start_catas_poll(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);
        phys_addr_t addr;

        /*If we are in SRIOV the default of the module param must be 0*/
        if (mlx4_is_mfunc(dev))
                internal_err_reset = 0;

        INIT_LIST_HEAD(&priv->catas_err.list);
        init_timer(&priv->catas_err.timer);
        priv->catas_err.map = NULL;

        addr = pci_resource_start(dev->pdev, priv->fw.catas_bar) +
                priv->fw.catas_offset;

        priv->catas_err.map = ioremap(addr, priv->fw.catas_size * 4);
        if (!priv->catas_err.map) {
                mlx4_warn(dev, "Failed to map internal error buffer at 0x%llx\n",
                          (unsigned long long) addr);
                return;
        }

        priv->catas_err.timer.data     = (unsigned long) dev;
        priv->catas_err.timer.function = poll_catas;
        priv->catas_err.timer.expires  =
                round_jiffies(jiffies + MLX4_CATAS_POLL_INTERVAL);
        add_timer(&priv->catas_err.timer);
}

void mlx4_stop_catas_poll(struct mlx4_dev *dev)
{
        struct mlx4_priv *priv = mlx4_priv(dev);

        del_timer_sync(&priv->catas_err.timer);

        if (priv->catas_err.map)
                iounmap(priv->catas_err.map);

        spin_lock_irq(&catas_lock);
        list_del(&priv->catas_err.list);
        spin_unlock_irq(&catas_lock);
}

void  __init mlx4_catas_init(void)
{
        INIT_WORK(&catas_work, catas_reset);
}