drivers/net/ethernet/mellanox/mlx5/core/health.c

   1 /*
   2  * Copyright (c) 2013-2015, Mellanox Technologies. 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/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/random.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/hardirq.h>
  38 #include <linux/mlx5/driver.h>
  39 #include <linux/mlx5/cmd.h>
  40 #include "mlx5_core.h"
  41
  42 enum {
  43         MLX5_HEALTH_POLL_INTERVAL       = 2 * HZ,
  44         MAX_MISSES                      = 3,
  45 };
  46
  47 enum {
  48         MLX5_HEALTH_SYNDR_FW_ERR                = 0x1,
  49         MLX5_HEALTH_SYNDR_IRISC_ERR             = 0x7,
  50         MLX5_HEALTH_SYNDR_HW_UNRECOVERABLE_ERR  = 0x8,
  51         MLX5_HEALTH_SYNDR_CRC_ERR               = 0x9,
  52         MLX5_HEALTH_SYNDR_FETCH_PCI_ERR         = 0xa,
  53         MLX5_HEALTH_SYNDR_HW_FTL_ERR            = 0xb,
  54         MLX5_HEALTH_SYNDR_ASYNC_EQ_OVERRUN_ERR  = 0xc,
  55         MLX5_HEALTH_SYNDR_EQ_ERR                = 0xd,
  56         MLX5_HEALTH_SYNDR_EQ_INV                = 0xe,
  57         MLX5_HEALTH_SYNDR_FFSER_ERR             = 0xf,
  58         MLX5_HEALTH_SYNDR_HIGH_TEMP             = 0x10
  59 };
  60
  61 enum {
  62         MLX5_NIC_IFC_FULL               = 0,
  63         MLX5_NIC_IFC_DISABLED           = 1,
  64         MLX5_NIC_IFC_NO_DRAM_NIC        = 2,
  65         MLX5_NIC_IFC_INVALID            = 3
  66 };
  67
  68 enum {
  69         MLX5_DROP_NEW_HEALTH_WORK,
  70         MLX5_DROP_NEW_RECOVERY_WORK,
  71 };
  72
  73 static u8 get_nic_state(struct mlx5_core_dev *dev)
  74 {
  75         return (ioread32be(&dev->iseg->cmdq_addr_l_sz) >> 8) & 3;
  76 }
  77
  78 static void trigger_cmd_completions(struct mlx5_core_dev *dev)
  79 {
  80         unsigned long flags;
  81         u64 vector;
  82
  83         /* wait for pending handlers to complete */
  84         synchronize_irq(pci_irq_vector(dev->pdev, MLX5_EQ_VEC_CMD));
  85         spin_lock_irqsave(&dev->cmd.alloc_lock, flags);
  86         vector = ~dev->cmd.bitmask & ((1ul << (1 << dev->cmd.log_sz)) - 1);
  87         if (!vector)
  88                 goto no_trig;
  89
  90         vector |= MLX5_TRIGGERED_CMD_COMP;
  91         spin_unlock_irqrestore(&dev->cmd.alloc_lock, flags);
  92
  93         mlx5_core_dbg(dev, "vector 0x%llx\n", vector);
  94         mlx5_cmd_comp_handler(dev, vector, true);
  95         return;
  96
  97 no_trig:
  98         spin_unlock_irqrestore(&dev->cmd.alloc_lock, flags);
  99 }
 100
 101 static int in_fatal(struct mlx5_core_dev *dev)
 102 {
 103         struct mlx5_core_health *health = &dev->priv.health;
 104         struct health_buffer __iomem *h = health->health;
 105
 106         if (get_nic_state(dev) == MLX5_NIC_IFC_DISABLED)
 107                 return 1;
 108
 109         if (ioread32be(&h->fw_ver) == 0xffffffff)
 110                 return 1;
 111
 112         return 0;
 113 }
 114
 115 void mlx5_enter_error_state(struct mlx5_core_dev *dev, bool force)
 116 {
 117         mutex_lock(&dev->intf_state_mutex);
 118         if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
 119                 goto unlock;
 120
 121         mlx5_core_err(dev, "start\n");
 122         if (pci_channel_offline(dev->pdev) || in_fatal(dev) || force) {
 123                 dev->state = MLX5_DEVICE_STATE_INTERNAL_ERROR;
 124                 trigger_cmd_completions(dev);
 125         }
 126
 127         mlx5_core_event(dev, MLX5_DEV_EVENT_SYS_ERROR, 1);
 128         mlx5_core_err(dev, "end\n");
 129
 130 unlock:
 131         mutex_unlock(&dev->intf_state_mutex);
 132 }
 133
 134 static void mlx5_handle_bad_state(struct mlx5_core_dev *dev)
 135 {
 136         u8 nic_interface = get_nic_state(dev);
 137
 138         switch (nic_interface) {
 139         case MLX5_NIC_IFC_FULL:
 140                 mlx5_core_warn(dev, "Expected to see disabled NIC but it is full driver\n");
 141                 break;
 142
 143         case MLX5_NIC_IFC_DISABLED:
 144                 mlx5_core_warn(dev, "starting teardown\n");
 145                 break;
 146
 147         case MLX5_NIC_IFC_NO_DRAM_NIC:
 148                 mlx5_core_warn(dev, "Expected to see disabled NIC but it is no dram nic\n");
 149                 break;
 150         default:
 151                 mlx5_core_warn(dev, "Expected to see disabled NIC but it is has invalid value %d\n",
 152                                nic_interface);
 153         }
 154
 155         mlx5_disable_device(dev);
 156 }
 157
 158 static void health_recover(struct work_struct *work)
 159 {
 160         struct mlx5_core_health *health;
 161         struct delayed_work *dwork;
 162         struct mlx5_core_dev *dev;
 163         struct mlx5_priv *priv;
 164         u8 nic_state;
 165
 166         dwork = container_of(work, struct delayed_work, work);
 167         health = container_of(dwork, struct mlx5_core_health, recover_work);
 168         priv = container_of(health, struct mlx5_priv, health);
 169         dev = container_of(priv, struct mlx5_core_dev, priv);
 170
 171         nic_state = get_nic_state(dev);
 172         if (nic_state == MLX5_NIC_IFC_INVALID) {
 173                 dev_err(&dev->pdev->dev, "health recovery flow aborted since the nic state is invalid\n");
 174                 return;
 175         }
 176
 177         dev_err(&dev->pdev->dev, "starting health recovery flow\n");
 178         mlx5_recover_device(dev);
 179 }
 180
 181 /* How much time to wait until health resetting the driver (in msecs) */
 182 #define MLX5_RECOVERY_DELAY_MSECS 60000
 183 static void health_care(struct work_struct *work)
 184 {
 185         unsigned long recover_delay = msecs_to_jiffies(MLX5_RECOVERY_DELAY_MSECS);
 186         struct mlx5_core_health *health;
 187         struct mlx5_core_dev *dev;
 188         struct mlx5_priv *priv;
 189         unsigned long flags;
 190
 191         health = container_of(work, struct mlx5_core_health, work);
 192         priv = container_of(health, struct mlx5_priv, health);
 193         dev = container_of(priv, struct mlx5_core_dev, priv);
 194         mlx5_core_warn(dev, "handling bad device here\n");
 195         mlx5_handle_bad_state(dev);
 196
 197         spin_lock_irqsave(&health->wq_lock, flags);
 198         if (!test_bit(MLX5_DROP_NEW_RECOVERY_WORK, &health->flags))
 199                 schedule_delayed_work(&health->recover_work, recover_delay);
 200         else
 201                 dev_err(&dev->pdev->dev,
 202                         "new health works are not permitted at this stage\n");
 203         spin_unlock_irqrestore(&health->wq_lock, flags);
 204 }
 205
 206 static const char *hsynd_str(u8 synd)
 207 {
 208         switch (synd) {
 209         case MLX5_HEALTH_SYNDR_FW_ERR:
 210                 return "firmware internal error";
 211         case MLX5_HEALTH_SYNDR_IRISC_ERR:
 212                 return "irisc not responding";
 213         case MLX5_HEALTH_SYNDR_HW_UNRECOVERABLE_ERR:
 214                 return "unrecoverable hardware error";
 215         case MLX5_HEALTH_SYNDR_CRC_ERR:
 216                 return "firmware CRC error";
 217         case MLX5_HEALTH_SYNDR_FETCH_PCI_ERR:
 218                 return "ICM fetch PCI error";
 219         case MLX5_HEALTH_SYNDR_HW_FTL_ERR:
 220                 return "HW fatal error\n";
 221         case MLX5_HEALTH_SYNDR_ASYNC_EQ_OVERRUN_ERR:
 222                 return "async EQ buffer overrun";
 223         case MLX5_HEALTH_SYNDR_EQ_ERR:
 224                 return "EQ error";
 225         case MLX5_HEALTH_SYNDR_EQ_INV:
 226                 return "Invalid EQ referenced";
 227         case MLX5_HEALTH_SYNDR_FFSER_ERR:
 228                 return "FFSER error";
 229         case MLX5_HEALTH_SYNDR_HIGH_TEMP:
 230                 return "High temperature";
 231         default:
 232                 return "unrecognized error";
 233         }
 234 }
 235
 236 static void print_health_info(struct mlx5_core_dev *dev)
 237 {
 238         struct mlx5_core_health *health = &dev->priv.health;
 239         struct health_buffer __iomem *h = health->health;
 240         char fw_str[18];
 241         u32 fw;
 242         int i;
 243
 244         /* If the syndrome is 0, the device is OK and no need to print buffer */
 245         if (!ioread8(&h->synd))
 246                 return;
 247
 248         for (i = 0; i < ARRAY_SIZE(h->assert_var); i++)
 249                 dev_err(&dev->pdev->dev, "assert_var[%d] 0x%08x\n", i, ioread32be(h->assert_var + i));
 250
 251         dev_err(&dev->pdev->dev, "assert_exit_ptr 0x%08x\n", ioread32be(&h->assert_exit_ptr));
 252         dev_err(&dev->pdev->dev, "assert_callra 0x%08x\n", ioread32be(&h->assert_callra));
 253         sprintf(fw_str, "%d.%d.%d", fw_rev_maj(dev), fw_rev_min(dev), fw_rev_sub(dev));
 254         dev_err(&dev->pdev->dev, "fw_ver %s\n", fw_str);
 255         dev_err(&dev->pdev->dev, "hw_id 0x%08x\n", ioread32be(&h->hw_id));
 256         dev_err(&dev->pdev->dev, "irisc_index %d\n", ioread8(&h->irisc_index));
 257         dev_err(&dev->pdev->dev, "synd 0x%x: %s\n", ioread8(&h->synd), hsynd_str(ioread8(&h->synd)));
 258         dev_err(&dev->pdev->dev, "ext_synd 0x%04x\n", ioread16be(&h->ext_synd));
 259         fw = ioread32be(&h->fw_ver);
 260         dev_err(&dev->pdev->dev, "raw fw_ver 0x%08x\n", fw);
 261 }
 262
 263 static unsigned long get_next_poll_jiffies(void)
 264 {
 265         unsigned long next;
 266
 267         get_random_bytes(&next, sizeof(next));
 268         next %= HZ;
 269         next += jiffies + MLX5_HEALTH_POLL_INTERVAL;
 270
 271         return next;
 272 }
 273
 274 void mlx5_trigger_health_work(struct mlx5_core_dev *dev)
 275 {
 276         struct mlx5_core_health *health = &dev->priv.health;
 277         unsigned long flags;
 278
 279         spin_lock_irqsave(&health->wq_lock, flags);
 280         if (!test_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags))
 281                 queue_work(health->wq, &health->work);
 282         else
 283                 dev_err(&dev->pdev->dev,
 284                         "new health works are not permitted at this stage\n");
 285         spin_unlock_irqrestore(&health->wq_lock, flags);
 286 }
 287
 288 static void poll_health(struct timer_list *t)
 289 {
 290         struct mlx5_core_dev *dev = from_timer(dev, t, priv.health.timer);
 291         struct mlx5_core_health *health = &dev->priv.health;
 292         u32 count;
 293
 294         if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
 295                 goto out;
 296
 297         count = ioread32be(health->health_counter);
 298         if (count == health->prev)
 299                 ++health->miss_counter;
 300         else
 301                 health->miss_counter = 0;
 302
 303         health->prev = count;
 304         if (health->miss_counter == MAX_MISSES) {
 305                 dev_err(&dev->pdev->dev, "device's health compromised - reached miss count\n");
 306                 print_health_info(dev);
 307         }
 308
 309         if (in_fatal(dev) && !health->sick) {
 310                 health->sick = true;
 311                 print_health_info(dev);
 312                 mlx5_trigger_health_work(dev);
 313         }
 314
 315 out:
 316         mod_timer(&health->timer, get_next_poll_jiffies());
 317 }
 318
 319 void mlx5_start_health_poll(struct mlx5_core_dev *dev)
 320 {
 321         struct mlx5_core_health *health = &dev->priv.health;
 322
 323         timer_setup(&health->timer, poll_health, 0);
 324         health->sick = 0;
 325         clear_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags);
 326         clear_bit(MLX5_DROP_NEW_RECOVERY_WORK, &health->flags);
 327         health->health = &dev->iseg->health;
 328         health->health_counter = &dev->iseg->health_counter;
 329
 330         health->timer.expires = round_jiffies(jiffies + MLX5_HEALTH_POLL_INTERVAL);
 331         add_timer(&health->timer);
 332 }
 333
 334 void mlx5_stop_health_poll(struct mlx5_core_dev *dev)
 335 {
 336         struct mlx5_core_health *health = &dev->priv.health;
 337
 338         del_timer_sync(&health->timer);
 339 }
 340
 341 void mlx5_drain_health_wq(struct mlx5_core_dev *dev)
 342 {
 343         struct mlx5_core_health *health = &dev->priv.health;
 344         unsigned long flags;
 345
 346         spin_lock_irqsave(&health->wq_lock, flags);
 347         set_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags);
 348         set_bit(MLX5_DROP_NEW_RECOVERY_WORK, &health->flags);
 349         spin_unlock_irqrestore(&health->wq_lock, flags);
 350         cancel_delayed_work_sync(&health->recover_work);
 351         cancel_work_sync(&health->work);
 352 }
 353
 354 void mlx5_drain_health_recovery(struct mlx5_core_dev *dev)
 355 {
 356         struct mlx5_core_health *health = &dev->priv.health;
 357         unsigned long flags;
 358
 359         spin_lock_irqsave(&health->wq_lock, flags);
 360         set_bit(MLX5_DROP_NEW_RECOVERY_WORK, &health->flags);
 361         spin_unlock_irqrestore(&health->wq_lock, flags);
 362         cancel_delayed_work_sync(&dev->priv.health.recover_work);
 363 }
 364
 365 void mlx5_health_cleanup(struct mlx5_core_dev *dev)
 366 {
 367         struct mlx5_core_health *health = &dev->priv.health;
 368
 369         destroy_workqueue(health->wq);
 370 }
 371
 372 int mlx5_health_init(struct mlx5_core_dev *dev)
 373 {
 374         struct mlx5_core_health *health;
 375         char *name;
 376
 377         health = &dev->priv.health;
 378         name = kmalloc(64, GFP_KERNEL);
 379         if (!name)
 380                 return -ENOMEM;
 381
 382         strcpy(name, "mlx5_health");
 383         strcat(name, dev_name(&dev->pdev->dev));
 384         health->wq = create_singlethread_workqueue(name);
 385         kfree(name);
 386         if (!health->wq)
 387                 return -ENOMEM;
 388         spin_lock_init(&health->wq_lock);
 389         INIT_WORK(&health->work, health_care);
 390         INIT_DELAYED_WORK(&health->recover_work, health_recover);
 391
 392         return 0;
 393 }