/*
 * Copyright (c) 2005 Cisco Systems.  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/jiffies.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/workqueue.h>

#include "mthca_dev.h"

enum {
        MTHCA_CATAS_POLL_INTERVAL       = 5 * HZ,

        MTHCA_CATAS_TYPE_INTERNAL       = 0,
        MTHCA_CATAS_TYPE_UPLINK         = 3,
        MTHCA_CATAS_TYPE_DDR            = 4,
        MTHCA_CATAS_TYPE_PARITY         = 5,
};

static DEFINE_SPINLOCK(catas_lock);

static LIST_HEAD(catas_list);
static struct workqueue_struct *catas_wq;
static struct work_struct catas_work;

static int catas_reset_disable;
module_param_named(catas_reset_disable, catas_reset_disable, int, 0644);
MODULE_PARM_DESC(catas_reset_disable, "disable reset on catastrophic event if nonzero");

static void catas_reset(struct work_struct *work)
{
        struct mthca_dev *dev, *tmpdev;
        LIST_HEAD(tlist);
        int ret;

        mutex_lock(&mthca_device_mutex);

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

        list_for_each_entry_safe(dev, tmpdev, &tlist, catas_err.list) {
                struct pci_dev *pdev = dev->pdev;
                ret = __mthca_restart_one(dev->pdev);
                /* 'dev' now is not valid */
                if (ret)
                        printk(KERN_ERR "mthca %s: Reset failed (%d)\n",
                               pci_name(pdev), ret);
                else {
                        struct mthca_dev *d = pci_get_drvdata(pdev);
                        mthca_dbg(d, "Reset succeeded\n");
                }
        }

        mutex_unlock(&mthca_device_mutex);
}

static void handle_catas(struct mthca_dev *dev)
{
        struct ib_event event;
        unsigned long flags;
        const char *type;
        int i;

        event.device = &dev->ib_dev;
        event.event  = IB_EVENT_DEVICE_FATAL;
        event.element.port_num = 0;
        dev->active = false;

        ib_dispatch_event(&event);

        switch (swab32(readl(dev->catas_err.map)) >> 24) {
        case MTHCA_CATAS_TYPE_INTERNAL:
                type = "internal error";
                break;
        case MTHCA_CATAS_TYPE_UPLINK:
                type = "uplink bus error";
                break;
        case MTHCA_CATAS_TYPE_DDR:
                type = "DDR data error";
                break;
        case MTHCA_CATAS_TYPE_PARITY:
                type = "internal parity error";
                break;
        default:
                type = "unknown error";
                break;
        }

        mthca_err(dev, "Catastrophic error detected: %s\n", type);
        for (i = 0; i < dev->catas_err.size; ++i)
                mthca_err(dev, "  buf[%02x]: %08x\n",
                          i, swab32(readl(dev->catas_err.map + i)));

        if (catas_reset_disable)
                return;

        spin_lock_irqsave(&catas_lock, flags);
        list_add(&dev->catas_err.list, &catas_list);
        queue_work(catas_wq, &catas_work);
        spin_unlock_irqrestore(&catas_lock, flags);
}

static void poll_catas(struct timer_list *t)
{
        struct mthca_dev *dev = from_timer(dev, t, catas_err.timer);
        int i;

        for (i = 0; i < dev->catas_err.size; ++i)
                if (readl(dev->catas_err.map + i)) {
                        handle_catas(dev);
                        return;
                }

        mod_timer(&dev->catas_err.timer,
                  round_jiffies(jiffies + MTHCA_CATAS_POLL_INTERVAL));
}

void mthca_start_catas_poll(struct mthca_dev *dev)
{
        phys_addr_t addr;

        timer_setup(&dev->catas_err.timer, poll_catas, 0);
        dev->catas_err.map  = NULL;

        addr = pci_resource_start(dev->pdev, 0) +
                ((pci_resource_len(dev->pdev, 0) - 1) &
                 dev->catas_err.addr);

        dev->catas_err.map = ioremap(addr, dev->catas_err.size * 4);
        if (!dev->catas_err.map) {
                mthca_warn(dev, "couldn't map catastrophic error region "
                           "at 0x%llx/0x%x\n", (unsigned long long) addr,
                           dev->catas_err.size * 4);
                return;
        }

        dev->catas_err.timer.expires  = jiffies + MTHCA_CATAS_POLL_INTERVAL;
        INIT_LIST_HEAD(&dev->catas_err.list);
        add_timer(&dev->catas_err.timer);
}

void mthca_stop_catas_poll(struct mthca_dev *dev)
{
        del_timer_sync(&dev->catas_err.timer);

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

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

int __init mthca_catas_init(void)
{
        INIT_WORK(&catas_work, catas_reset);

        catas_wq = alloc_ordered_workqueue("mthca_catas", WQ_MEM_RECLAIM);
        if (!catas_wq)
                return -ENOMEM;

        return 0;
}

void mthca_catas_cleanup(void)
{
        destroy_workqueue(catas_wq);
}