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         dev->active = false;
  92
  93         ib_dispatch_event(&event);
  94
  95         switch (swab32(readl(dev->catas_err.map)) >> 24) {
  96         case MTHCA_CATAS_TYPE_INTERNAL:
  97                 type = "internal error";
  98                 break;
  99         case MTHCA_CATAS_TYPE_UPLINK:
 100                 type = "uplink bus error";
 101                 break;
 102         case MTHCA_CATAS_TYPE_DDR:
 103                 type = "DDR data error";
 104                 break;
 105         case MTHCA_CATAS_TYPE_PARITY:
 106                 type = "internal parity error";
 107                 break;
 108         default:
 109                 type = "unknown error";
 110                 break;
 111         }
 112
 113         mthca_err(dev, "Catastrophic error detected: %s\n", type);
 114         for (i = 0; i < dev->catas_err.size; ++i)
 115                 mthca_err(dev, "  buf[%02x]: %08x\n",
 116                           i, swab32(readl(dev->catas_err.map + i)));
 117
 118         if (catas_reset_disable)
 119                 return;
 120
 121         spin_lock_irqsave(&catas_lock, flags);
 122         list_add(&dev->catas_err.list, &catas_list);
 123         queue_work(catas_wq, &catas_work);
 124         spin_unlock_irqrestore(&catas_lock, flags);
 125 }
 126
 127 static void poll_catas(unsigned long dev_ptr)
 128 {
 129         struct mthca_dev *dev = (struct mthca_dev *) dev_ptr;
 130         int i;
 131
 132         for (i = 0; i < dev->catas_err.size; ++i)
 133                 if (readl(dev->catas_err.map + i)) {
 134                         handle_catas(dev);
 135                         return;
 136                 }
 137
 138         mod_timer(&dev->catas_err.timer,
 139                   round_jiffies(jiffies + MTHCA_CATAS_POLL_INTERVAL));
 140 }
 141
 142 void mthca_start_catas_poll(struct mthca_dev *dev)
 143 {
 144         unsigned long addr;
 145
 146         init_timer(&dev->catas_err.timer);
 147         dev->catas_err.map  = NULL;
 148
 149         addr = pci_resource_start(dev->pdev, 0) +
 150                 ((pci_resource_len(dev->pdev, 0) - 1) &
 151                  dev->catas_err.addr);
 152
 153         dev->catas_err.map = ioremap(addr, dev->catas_err.size * 4);
 154         if (!dev->catas_err.map) {
 155                 mthca_warn(dev, "couldn't map catastrophic error region "
 156                            "at 0x%lx/0x%x\n", addr, dev->catas_err.size * 4);
 157                 return;
 158         }
 159
 160         dev->catas_err.timer.data     = (unsigned long) dev;
 161         dev->catas_err.timer.function = poll_catas;
 162         dev->catas_err.timer.expires  = jiffies + MTHCA_CATAS_POLL_INTERVAL;
 163         INIT_LIST_HEAD(&dev->catas_err.list);
 164         add_timer(&dev->catas_err.timer);
 165 }
 166
 167 void mthca_stop_catas_poll(struct mthca_dev *dev)
 168 {
 169         del_timer_sync(&dev->catas_err.timer);
 170
 171         if (dev->catas_err.map)
 172                 iounmap(dev->catas_err.map);
 173
 174         spin_lock_irq(&catas_lock);
 175         list_del(&dev->catas_err.list);
 176         spin_unlock_irq(&catas_lock);
 177 }
 178
 179 int __init mthca_catas_init(void)
 180 {
 181         INIT_WORK(&catas_work, catas_reset);
 182
 183         catas_wq = create_singlethread_workqueue("mthca_catas");
 184         if (!catas_wq)
 185                 return -ENOMEM;
 186
 187         return 0;
 188 }
 189
 190 void mthca_catas_cleanup(void)
 191 {
 192         destroy_workqueue(catas_wq);
 193 }