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mthca_catas.c

/*
 * 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.
 *
 * $Id$
 */

#include <linux/jiffies.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) {
            ret = __mthca_restart_one(dev->pdev);
            if (ret)
                  mthca_err(dev, "Reset failed (%d)\n", ret);
            else
                  mthca_dbg(dev, "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;

      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(unsigned long dev_ptr)
{
      struct mthca_dev *dev = (struct mthca_dev *) dev_ptr;
      unsigned long flags;
      int i;

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

      spin_lock_irqsave(&catas_lock, flags);
      if (!dev->catas_err.stop)
            mod_timer(&dev->catas_err.timer,
                    jiffies + MTHCA_CATAS_POLL_INTERVAL);
      spin_unlock_irqrestore(&catas_lock, flags);

      return;
}

void mthca_start_catas_poll(struct mthca_dev *dev)
{
      unsigned long addr;

      init_timer(&dev->catas_err.timer);
      dev->catas_err.stop = 0;
      dev->catas_err.map  = NULL;

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

      if (!request_mem_region(addr, dev->catas_err.size * 4,
                        DRV_NAME)) {
            mthca_warn(dev, "couldn't request catastrophic error region "
                     "at 0x%lx/0x%x\n", addr, dev->catas_err.size * 4);
            return;
      }

      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%lx/0x%x\n", addr, dev->catas_err.size * 4);
            release_mem_region(addr, dev->catas_err.size * 4);
            return;
      }

      dev->catas_err.timer.data     = (unsigned long) dev;
      dev->catas_err.timer.function = poll_catas;
      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)
{
      spin_lock_irq(&catas_lock);
      dev->catas_err.stop = 1;
      spin_unlock_irq(&catas_lock);

      del_timer_sync(&dev->catas_err.timer);

      if (dev->catas_err.map) {
            iounmap(dev->catas_err.map);
            release_mem_region(pci_resource_start(dev->pdev, 0) +
                           ((pci_resource_len(dev->pdev, 0) - 1) &
                            dev->catas_err.addr),
                           dev->catas_err.size * 4);
      }

      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 = create_singlethread_workqueue("mthca_catas");
      if (!catas_wq)
            return -ENOMEM;

      return 0;
}

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

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