drivers/crypto/qat/qat_common/adf_aer.c

   1 /*
   2   This file is provided under a dual BSD/GPLv2 license.  When using or
   3   redistributing this file, you may do so under either license.
   4
   5   GPL LICENSE SUMMARY
   6   Copyright(c) 2014 Intel Corporation.
   7   This program is free software; you can redistribute it and/or modify
   8   it under the terms of version 2 of the GNU General Public License as
   9   published by the Free Software Foundation.
  10
  11   This program is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14   General Public License for more details.
  15
  16   Contact Information:
  17   qat-linux@intel.com
  18
  19   BSD LICENSE
  20   Copyright(c) 2014 Intel Corporation.
  21   Redistribution and use in source and binary forms, with or without
  22   modification, are permitted provided that the following conditions
  23   are met:
  24
  25     * Redistributions of source code must retain the above copyright
  26       notice, this list of conditions and the following disclaimer.
  27     * Redistributions in binary form must reproduce the above copyright
  28       notice, this list of conditions and the following disclaimer in
  29       the documentation and/or other materials provided with the
  30       distribution.
  31     * Neither the name of Intel Corporation nor the names of its
  32       contributors may be used to endorse or promote products derived
  33       from this software without specific prior written permission.
  34
  35   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  36   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  37   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  38   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  39   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  41   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  42   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  43   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  44   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  45   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  46 */
  47 #include <linux/kernel.h>
  48 #include <linux/pci.h>
  49 #include <linux/aer.h>
  50 #include <linux/completion.h>
  51 #include <linux/workqueue.h>
  52 #include <linux/delay.h>
  53 #include "adf_accel_devices.h"
  54 #include "adf_common_drv.h"
  55
  56 static struct workqueue_struct *device_reset_wq;
  57
  58 static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
  59                                            pci_channel_state_t state)
  60 {
  61         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
  62
  63         dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
  64         if (!accel_dev) {
  65                 dev_err(&pdev->dev, "Can't find acceleration device\n");
  66                 return PCI_ERS_RESULT_DISCONNECT;
  67         }
  68
  69         if (state == pci_channel_io_perm_failure) {
  70                 dev_err(&pdev->dev, "Can't recover from device error\n");
  71                 return PCI_ERS_RESULT_DISCONNECT;
  72         }
  73
  74         return PCI_ERS_RESULT_NEED_RESET;
  75 }
  76
  77 /* reset dev data */
  78 struct adf_reset_dev_data {
  79         int mode;
  80         struct adf_accel_dev *accel_dev;
  81         struct completion compl;
  82         struct work_struct reset_work;
  83 };
  84
  85 static void adf_dev_restore(struct adf_accel_dev *accel_dev)
  86 {
  87         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  88         struct pci_dev *parent = pdev->bus->self;
  89         uint16_t bridge_ctl = 0;
  90
  91         if (accel_dev->is_vf)
  92                 return;
  93
  94         dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
  95                  accel_dev->accel_id);
  96
  97         if (!parent)
  98                 parent = pdev;
  99
 100         if (!pci_wait_for_pending_transaction(pdev))
 101                 dev_info(&GET_DEV(accel_dev),
 102                          "Transaction still in progress. Proceeding\n");
 103
 104         pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
 105         bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
 106         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
 107         msleep(100);
 108         bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 109         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
 110         msleep(100);
 111         pci_restore_state(pdev);
 112         pci_save_state(pdev);
 113 }
 114
 115 static void adf_device_reset_worker(struct work_struct *work)
 116 {
 117         struct adf_reset_dev_data *reset_data =
 118                   container_of(work, struct adf_reset_dev_data, reset_work);
 119         struct adf_accel_dev *accel_dev = reset_data->accel_dev;
 120
 121         adf_dev_restarting_notify(accel_dev);
 122         adf_dev_stop(accel_dev);
 123         adf_dev_shutdown(accel_dev);
 124         adf_dev_restore(accel_dev);
 125         if (adf_dev_init(accel_dev) || adf_dev_start(accel_dev)) {
 126                 /* The device hanged and we can't restart it so stop here */
 127                 dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
 128                 kfree(reset_data);
 129                 WARN(1, "QAT: device restart failed. Device is unusable\n");
 130                 return;
 131         }
 132         adf_dev_restarted_notify(accel_dev);
 133         clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 134
 135         /* The dev is back alive. Notify the caller if in sync mode */
 136         if (reset_data->mode == ADF_DEV_RESET_SYNC)
 137                 complete(&reset_data->compl);
 138         else
 139                 kfree(reset_data);
 140 }
 141
 142 static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
 143                                       enum adf_dev_reset_mode mode)
 144 {
 145         struct adf_reset_dev_data *reset_data;
 146
 147         if (!adf_dev_started(accel_dev) ||
 148             test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
 149                 return 0;
 150
 151         set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 152         reset_data = kzalloc(sizeof(*reset_data), GFP_ATOMIC);
 153         if (!reset_data)
 154                 return -ENOMEM;
 155         reset_data->accel_dev = accel_dev;
 156         init_completion(&reset_data->compl);
 157         reset_data->mode = mode;
 158         INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
 159         queue_work(device_reset_wq, &reset_data->reset_work);
 160
 161         /* If in sync mode wait for the result */
 162         if (mode == ADF_DEV_RESET_SYNC) {
 163                 int ret = 0;
 164                 /* Maximum device reset time is 10 seconds */
 165                 unsigned long wait_jiffies = msecs_to_jiffies(10000);
 166                 unsigned long timeout = wait_for_completion_timeout(
 167                                    &reset_data->compl, wait_jiffies);
 168                 if (!timeout) {
 169                         dev_err(&GET_DEV(accel_dev),
 170                                 "Reset device timeout expired\n");
 171                         ret = -EFAULT;
 172                 }
 173                 kfree(reset_data);
 174                 return ret;
 175         }
 176         return 0;
 177 }
 178
 179 static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
 180 {
 181         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
 182
 183         if (!accel_dev) {
 184                 pr_err("QAT: Can't find acceleration device\n");
 185                 return PCI_ERS_RESULT_DISCONNECT;
 186         }
 187         pci_cleanup_aer_uncorrect_error_status(pdev);
 188         if (adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_SYNC))
 189                 return PCI_ERS_RESULT_DISCONNECT;
 190
 191         return PCI_ERS_RESULT_RECOVERED;
 192 }
 193
 194 static void adf_resume(struct pci_dev *pdev)
 195 {
 196         dev_info(&pdev->dev, "Acceleration driver reset completed\n");
 197         dev_info(&pdev->dev, "Device is up and runnig\n");
 198 }
 199
 200 static struct pci_error_handlers adf_err_handler = {
 201         .error_detected = adf_error_detected,
 202         .slot_reset = adf_slot_reset,
 203         .resume = adf_resume,
 204 };
 205
 206 /**
 207  * adf_enable_aer() - Enable Advance Error Reporting for acceleration device
 208  * @accel_dev:  Pointer to acceleration device.
 209  * @adf:        PCI device driver owning the given acceleration device.
 210  *
 211  * Function enables PCI Advance Error Reporting for the
 212  * QAT acceleration device accel_dev.
 213  * To be used by QAT device specific drivers.
 214  *
 215  * Return: 0 on success, error code otherwise.
 216  */
 217 int adf_enable_aer(struct adf_accel_dev *accel_dev, struct pci_driver *adf)
 218 {
 219         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 220
 221         adf->err_handler = &adf_err_handler;
 222         pci_enable_pcie_error_reporting(pdev);
 223         return 0;
 224 }
 225 EXPORT_SYMBOL_GPL(adf_enable_aer);
 226
 227 /**
 228  * adf_disable_aer() - Enable Advance Error Reporting for acceleration device
 229  * @accel_dev:  Pointer to acceleration device.
 230  *
 231  * Function disables PCI Advance Error Reporting for the
 232  * QAT acceleration device accel_dev.
 233  * To be used by QAT device specific drivers.
 234  *
 235  * Return: void
 236  */
 237 void adf_disable_aer(struct adf_accel_dev *accel_dev)
 238 {
 239         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 240
 241         pci_disable_pcie_error_reporting(pdev);
 242 }
 243 EXPORT_SYMBOL_GPL(adf_disable_aer);
 244
 245 int adf_init_aer(void)
 246 {
 247         device_reset_wq = create_workqueue("qat_device_reset_wq");
 248         return !device_reset_wq ? -EFAULT : 0;
 249 }
 250
 251 void adf_exit_aer(void)
 252 {
 253         if (device_reset_wq)
 254                 destroy_workqueue(device_reset_wq);
 255         device_reset_wq = NULL;
 256 }