drivers/net/ethernet/mellanox/mlx4/catas.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/workqueue.h>
  35 #include <linux/module.h>
  36
  37 #include "mlx4.h"
  38
  39 enum {
  40         MLX4_CATAS_POLL_INTERVAL        = 5 * HZ,
  41 };
  42
  43
  44
  45 int mlx4_internal_err_reset = 1;
  46 module_param_named(internal_err_reset, mlx4_internal_err_reset,  int, 0644);
  47 MODULE_PARM_DESC(internal_err_reset,
  48                  "Reset device on internal errors if non-zero (default 1)");
  49
  50 static int read_vendor_id(struct mlx4_dev *dev)
  51 {
  52         u16 vendor_id = 0;
  53         int ret;
  54
  55         ret = pci_read_config_word(dev->persist->pdev, 0, &vendor_id);
  56         if (ret) {
  57                 mlx4_err(dev, "Failed to read vendor ID, ret=%d\n", ret);
  58                 return ret;
  59         }
  60
  61         if (vendor_id == 0xffff) {
  62                 mlx4_err(dev, "PCI can't be accessed to read vendor id\n");
  63                 return -EINVAL;
  64         }
  65
  66         return 0;
  67 }
  68
  69 static int mlx4_reset_master(struct mlx4_dev *dev)
  70 {
  71         int err = 0;
  72
  73         if (mlx4_is_master(dev))
  74                 mlx4_report_internal_err_comm_event(dev);
  75
  76         if (!pci_channel_offline(dev->persist->pdev)) {
  77                 err = read_vendor_id(dev);
  78                 /* If PCI can't be accessed to read vendor ID we assume that its
  79                  * link was disabled and chip was already reset.
  80                  */
  81                 if (err)
  82                         return 0;
  83
  84                 err = mlx4_reset(dev);
  85                 if (err)
  86                         mlx4_err(dev, "Fail to reset HCA\n");
  87         }
  88
  89         return err;
  90 }
  91
  92 static int mlx4_reset_slave(struct mlx4_dev *dev)
  93 {
  94 #define COM_CHAN_RST_REQ_OFFSET 0x10
  95 #define COM_CHAN_RST_ACK_OFFSET 0x08
  96
  97         u32 comm_flags;
  98         u32 rst_req;
  99         u32 rst_ack;
 100         unsigned long end;
 101         struct mlx4_priv *priv = mlx4_priv(dev);
 102
 103         if (pci_channel_offline(dev->persist->pdev))
 104                 return 0;
 105
 106         comm_flags = swab32(readl((__iomem char *)priv->mfunc.comm +
 107                                   MLX4_COMM_CHAN_FLAGS));
 108         if (comm_flags == 0xffffffff) {
 109                 mlx4_err(dev, "VF reset is not needed\n");
 110                 return 0;
 111         }
 112
 113         if (!(dev->caps.vf_caps & MLX4_VF_CAP_FLAG_RESET)) {
 114                 mlx4_err(dev, "VF reset is not supported\n");
 115                 return -EOPNOTSUPP;
 116         }
 117
 118         rst_req = (comm_flags & (u32)(1 << COM_CHAN_RST_REQ_OFFSET)) >>
 119                 COM_CHAN_RST_REQ_OFFSET;
 120         rst_ack = (comm_flags & (u32)(1 << COM_CHAN_RST_ACK_OFFSET)) >>
 121                 COM_CHAN_RST_ACK_OFFSET;
 122         if (rst_req != rst_ack) {
 123                 mlx4_err(dev, "Communication channel isn't sync, fail to send reset\n");
 124                 return -EIO;
 125         }
 126
 127         rst_req ^= 1;
 128         mlx4_warn(dev, "VF is sending reset request to Firmware\n");
 129         comm_flags = rst_req << COM_CHAN_RST_REQ_OFFSET;
 130         __raw_writel((__force u32)cpu_to_be32(comm_flags),
 131                      (__iomem char *)priv->mfunc.comm + MLX4_COMM_CHAN_FLAGS);
 132         /* Make sure that our comm channel write doesn't
 133          * get mixed in with writes from another CPU.
 134          */
 135         mmiowb();
 136
 137         end = msecs_to_jiffies(MLX4_COMM_TIME) + jiffies;
 138         while (time_before(jiffies, end)) {
 139                 comm_flags = swab32(readl((__iomem char *)priv->mfunc.comm +
 140                                           MLX4_COMM_CHAN_FLAGS));
 141                 rst_ack = (comm_flags & (u32)(1 << COM_CHAN_RST_ACK_OFFSET)) >>
 142                         COM_CHAN_RST_ACK_OFFSET;
 143
 144                 /* Reading rst_req again since the communication channel can
 145                  * be reset at any time by the PF and all its bits will be
 146                  * set to zero.
 147                  */
 148                 rst_req = (comm_flags & (u32)(1 << COM_CHAN_RST_REQ_OFFSET)) >>
 149                         COM_CHAN_RST_REQ_OFFSET;
 150
 151                 if (rst_ack == rst_req) {
 152                         mlx4_warn(dev, "VF Reset succeed\n");
 153                         return 0;
 154                 }
 155                 cond_resched();
 156         }
 157         mlx4_err(dev, "Fail to send reset over the communication channel\n");
 158         return -ETIMEDOUT;
 159 }
 160
 161 int mlx4_comm_internal_err(u32 slave_read)
 162 {
 163         return (u32)COMM_CHAN_EVENT_INTERNAL_ERR ==
 164                 (slave_read & (u32)COMM_CHAN_EVENT_INTERNAL_ERR) ? 1 : 0;
 165 }
 166
 167 void mlx4_enter_error_state(struct mlx4_dev_persistent *persist)
 168 {
 169         int err;
 170         struct mlx4_dev *dev;
 171
 172         if (!mlx4_internal_err_reset)
 173                 return;
 174
 175         mutex_lock(&persist->device_state_mutex);
 176         if (persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR)
 177                 goto out;
 178
 179         dev = persist->dev;
 180         mlx4_err(dev, "device is going to be reset\n");
 181         if (mlx4_is_slave(dev))
 182                 err = mlx4_reset_slave(dev);
 183         else
 184                 err = mlx4_reset_master(dev);
 185
 186         if (!err) {
 187                 mlx4_err(dev, "device was reset successfully\n");
 188         } else {
 189                 /* EEH could have disabled the PCI channel during reset. That's
 190                  * recoverable and the PCI error flow will handle it.
 191                  */
 192                 if (!pci_channel_offline(dev->persist->pdev))
 193                         BUG_ON(1);
 194         }
 195         dev->persist->state |= MLX4_DEVICE_STATE_INTERNAL_ERROR;
 196         mutex_unlock(&persist->device_state_mutex);
 197
 198         /* At that step HW was already reset, now notify clients */
 199         mlx4_dispatch_event(dev, MLX4_DEV_EVENT_CATASTROPHIC_ERROR, 0);
 200         mlx4_cmd_wake_completions(dev);
 201         return;
 202
 203 out:
 204         mutex_unlock(&persist->device_state_mutex);
 205 }
 206
 207 static void mlx4_handle_error_state(struct mlx4_dev_persistent *persist)
 208 {
 209         int err = 0;
 210
 211         mlx4_enter_error_state(persist);
 212         mutex_lock(&persist->interface_state_mutex);
 213         if (persist->interface_state & MLX4_INTERFACE_STATE_UP &&
 214             !(persist->interface_state & MLX4_INTERFACE_STATE_DELETION)) {
 215                 err = mlx4_restart_one(persist->pdev);
 216                 mlx4_info(persist->dev, "mlx4_restart_one was ended, ret=%d\n",
 217                           err);
 218         }
 219         mutex_unlock(&persist->interface_state_mutex);
 220 }
 221
 222 static void dump_err_buf(struct mlx4_dev *dev)
 223 {
 224         struct mlx4_priv *priv = mlx4_priv(dev);
 225
 226         int i;
 227
 228         mlx4_err(dev, "Internal error detected:\n");
 229         for (i = 0; i < priv->fw.catas_size; ++i)
 230                 mlx4_err(dev, "  buf[%02x]: %08x\n",
 231                          i, swab32(readl(priv->catas_err.map + i)));
 232 }
 233
 234 static void poll_catas(unsigned long dev_ptr)
 235 {
 236         struct mlx4_dev *dev = (struct mlx4_dev *) dev_ptr;
 237         struct mlx4_priv *priv = mlx4_priv(dev);
 238         u32 slave_read;
 239
 240         if (mlx4_is_slave(dev)) {
 241                 slave_read = swab32(readl(&priv->mfunc.comm->slave_read));
 242                 if (mlx4_comm_internal_err(slave_read)) {
 243                         mlx4_warn(dev, "Internal error detected on the communication channel\n");
 244                         goto internal_err;
 245                 }
 246         } else if (readl(priv->catas_err.map)) {
 247                 dump_err_buf(dev);
 248                 goto internal_err;
 249         }
 250
 251         if (dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
 252                 mlx4_warn(dev, "Internal error mark was detected on device\n");
 253                 goto internal_err;
 254         }
 255
 256         mod_timer(&priv->catas_err.timer,
 257                   round_jiffies(jiffies + MLX4_CATAS_POLL_INTERVAL));
 258         return;
 259
 260 internal_err:
 261         if (mlx4_internal_err_reset)
 262                 queue_work(dev->persist->catas_wq, &dev->persist->catas_work);
 263 }
 264
 265 static void catas_reset(struct work_struct *work)
 266 {
 267         struct mlx4_dev_persistent *persist =
 268                 container_of(work, struct mlx4_dev_persistent,
 269                              catas_work);
 270
 271         mlx4_handle_error_state(persist);
 272 }
 273
 274 void mlx4_start_catas_poll(struct mlx4_dev *dev)
 275 {
 276         struct mlx4_priv *priv = mlx4_priv(dev);
 277         phys_addr_t addr;
 278
 279         INIT_LIST_HEAD(&priv->catas_err.list);
 280         init_timer(&priv->catas_err.timer);
 281         priv->catas_err.map = NULL;
 282
 283         if (!mlx4_is_slave(dev)) {
 284                 addr = pci_resource_start(dev->persist->pdev,
 285                                           priv->fw.catas_bar) +
 286                                           priv->fw.catas_offset;
 287
 288                 priv->catas_err.map = ioremap(addr, priv->fw.catas_size * 4);
 289                 if (!priv->catas_err.map) {
 290                         mlx4_warn(dev, "Failed to map internal error buffer at 0x%llx\n",
 291                                   (unsigned long long)addr);
 292                         return;
 293                 }
 294         }
 295
 296         priv->catas_err.timer.data     = (unsigned long) dev;
 297         priv->catas_err.timer.function = poll_catas;
 298         priv->catas_err.timer.expires  =
 299                 round_jiffies(jiffies + MLX4_CATAS_POLL_INTERVAL);
 300         add_timer(&priv->catas_err.timer);
 301 }
 302
 303 void mlx4_stop_catas_poll(struct mlx4_dev *dev)
 304 {
 305         struct mlx4_priv *priv = mlx4_priv(dev);
 306
 307         del_timer_sync(&priv->catas_err.timer);
 308
 309         if (priv->catas_err.map) {
 310                 iounmap(priv->catas_err.map);
 311                 priv->catas_err.map = NULL;
 312         }
 313
 314         if (dev->persist->interface_state & MLX4_INTERFACE_STATE_DELETION)
 315                 flush_workqueue(dev->persist->catas_wq);
 316 }
 317
 318 int  mlx4_catas_init(struct mlx4_dev *dev)
 319 {
 320         INIT_WORK(&dev->persist->catas_work, catas_reset);
 321         dev->persist->catas_wq = create_singlethread_workqueue("mlx4_health");
 322         if (!dev->persist->catas_wq)
 323                 return -ENOMEM;
 324
 325         return 0;
 326 }
 327
 328 void mlx4_catas_end(struct mlx4_dev *dev)
 329 {
 330         if (dev->persist->catas_wq) {
 331                 destroy_workqueue(dev->persist->catas_wq);
 332                 dev->persist->catas_wq = NULL;
 333         }
 334 }