drivers/infiniband/hw/mthca/mthca_catas.c

   1 /*
   2  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/jiffies.h>
  34 #include <linux/timer.h>
  35 #include <linux/workqueue.h>
  36
  37 #include "mthca_dev.h"
  38
  39 enum {
  40         MTHCA_CATAS_POLL_INTERVAL       = 5 * HZ,
  41
  42         MTHCA_CATAS_TYPE_INTERNAL       = 0,
  43         MTHCA_CATAS_TYPE_UPLINK         = 3,
  44         MTHCA_CATAS_TYPE_DDR            = 4,
  45         MTHCA_CATAS_TYPE_PARITY         = 5,
  46 };
  47
  48 static DEFINE_SPINLOCK(catas_lock);
  49
  50 static LIST_HEAD(catas_list);
  51 static struct workqueue_struct *catas_wq;
  52 static struct work_struct catas_work;
  53
  54 static int catas_reset_disable;
  55 module_param_named(catas_reset_disable, catas_reset_disable, int, 0644);
  56 MODULE_PARM_DESC(catas_reset_disable, "disable reset on catastrophic event if nonzero");
  57
  58 static void catas_reset(struct work_struct *work)
  59 {
  60         struct mthca_dev *dev, *tmpdev;
  61         LIST_HEAD(tlist);
  62         int ret;
  63
  64         mutex_lock(&mthca_device_mutex);
  65
  66         spin_lock_irq(&catas_lock);
  67         list_splice_init(&catas_list, &tlist);
  68         spin_unlock_irq(&catas_lock);
  69
  70         list_for_each_entry_safe(dev, tmpdev, &tlist, catas_err.list) {
  71                 ret = __mthca_restart_one(dev->pdev);
  72                 if (ret)
  73                         mthca_err(dev, "Reset failed (%d)\n", ret);
  74                 else
  75                         mthca_dbg(dev, "Reset succeeded\n");
  76         }
  77
  78         mutex_unlock(&mthca_device_mutex);
  79 }
  80
  81 static void handle_catas(struct mthca_dev *dev)
  82 {
  83         struct ib_event event;
  84         unsigned long flags;
  85         const char *type;
  86         int i;
  87
  88         event.device = &dev->ib_dev;
  89         event.event  = IB_EVENT_DEVICE_FATAL;
  90         event.element.port_num = 0;
  91
  92         ib_dispatch_event(&event);
  93
  94         switch (swab32(readl(dev->catas_err.map)) >> 24) {
  95         case MTHCA_CATAS_TYPE_INTERNAL:
  96                 type = "internal error";
  97                 break;
  98         case MTHCA_CATAS_TYPE_UPLINK:
  99                 type = "uplink bus error";
 100                 break;
 101         case MTHCA_CATAS_TYPE_DDR:
 102                 type = "DDR data error";
 103                 break;
 104         case MTHCA_CATAS_TYPE_PARITY:
 105                 type = "internal parity error";
 106                 break;
 107         default:
 108                 type = "unknown error";
 109                 break;
 110         }
 111
 112         mthca_err(dev, "Catastrophic error detected: %s\n", type);
 113         for (i = 0; i < dev->catas_err.size; ++i)
 114                 mthca_err(dev, "  buf[%02x]: %08x\n",
 115                           i, swab32(readl(dev->catas_err.map + i)));
 116
 117         if (catas_reset_disable)
 118                 return;
 119
 120         spin_lock_irqsave(&catas_lock, flags);
 121         list_add(&dev->catas_err.list, &catas_list);
 122         queue_work(catas_wq, &catas_work);
 123         spin_unlock_irqrestore(&catas_lock, flags);
 124 }
 125
 126 static void poll_catas(unsigned long dev_ptr)
 127 {
 128         struct mthca_dev *dev = (struct mthca_dev *) dev_ptr;
 129         int i;
 130
 131         for (i = 0; i < dev->catas_err.size; ++i)
 132                 if (readl(dev->catas_err.map + i)) {
 133                         handle_catas(dev);
 134                         return;
 135                 }
 136
 137         mod_timer(&dev->catas_err.timer,
 138                   round_jiffies(jiffies + MTHCA_CATAS_POLL_INTERVAL));
 139 }
 140
 141 void mthca_start_catas_poll(struct mthca_dev *dev)
 142 {
 143         unsigned long addr;
 144
 145         init_timer(&dev->catas_err.timer);
 146         dev->catas_err.map  = NULL;
 147
 148         addr = pci_resource_start(dev->pdev, 0) +
 149                 ((pci_resource_len(dev->pdev, 0) - 1) &
 150                  dev->catas_err.addr);
 151
 152         dev->catas_err.map = ioremap(addr, dev->catas_err.size * 4);
 153         if (!dev->catas_err.map) {
 154                 mthca_warn(dev, "couldn't map catastrophic error region "
 155                            "at 0x%lx/0x%x\n", addr, dev->catas_err.size * 4);
 156                 return;
 157         }
 158
 159         dev->catas_err.timer.data     = (unsigned long) dev;
 160         dev->catas_err.timer.function = poll_catas;
 161         dev->catas_err.timer.expires  = jiffies + MTHCA_CATAS_POLL_INTERVAL;
 162         INIT_LIST_HEAD(&dev->catas_err.list);
 163         add_timer(&dev->catas_err.timer);
 164 }
 165
 166 void mthca_stop_catas_poll(struct mthca_dev *dev)
 167 {
 168         del_timer_sync(&dev->catas_err.timer);
 169
 170         if (dev->catas_err.map)
 171                 iounmap(dev->catas_err.map);
 172
 173         spin_lock_irq(&catas_lock);
 174         list_del(&dev->catas_err.list);
 175         spin_unlock_irq(&catas_lock);
 176 }
 177
 178 int __init mthca_catas_init(void)
 179 {
 180         INIT_WORK(&catas_work, catas_reset);
 181
 182         catas_wq = create_singlethread_workqueue("mthca_catas");
 183         if (!catas_wq)
 184                 return -ENOMEM;
 185
 186         return 0;
 187 }
 188
 189 void mthca_catas_cleanup(void)
 190 {
 191         destroy_workqueue(catas_wq);
 192 }