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         dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
  92                  accel_dev->accel_id);
  93
  94         if (!pci_wait_for_pending_transaction(pdev))
  95                 dev_info(&GET_DEV(accel_dev),
  96                          "Transaction still in progress. Proceeding\n");
  97
  98         pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
  99         bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
 100         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
 101         msleep(100);
 102         bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 103         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
 104         msleep(100);
 105         pci_restore_state(pdev);
 106         pci_save_state(pdev);
 107 }
 108
 109 static void adf_device_reset_worker(struct work_struct *work)
 110 {
 111         struct adf_reset_dev_data *reset_data =
 112                   container_of(work, struct adf_reset_dev_data, reset_work);
 113         struct adf_accel_dev *accel_dev = reset_data->accel_dev;
 114
 115         adf_dev_restarting_notify(accel_dev);
 116         adf_dev_stop(accel_dev);
 117         adf_dev_shutdown(accel_dev);
 118         adf_dev_restore(accel_dev);
 119         if (adf_dev_init(accel_dev) || adf_dev_start(accel_dev)) {
 120                 /* The device hanged and we can't restart it so stop here */
 121                 dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
 122                 kfree(reset_data);
 123                 WARN(1, "QAT: device restart failed. Device is unusable\n");
 124                 return;
 125         }
 126         adf_dev_restarted_notify(accel_dev);
 127         clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 128
 129         /* The dev is back alive. Notify the caller if in sync mode */
 130         if (reset_data->mode == ADF_DEV_RESET_SYNC)
 131                 complete(&reset_data->compl);
 132         else
 133                 kfree(reset_data);
 134 }
 135
 136 static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
 137                                       enum adf_dev_reset_mode mode)
 138 {
 139         struct adf_reset_dev_data *reset_data;
 140
 141         if (!adf_dev_started(accel_dev) ||
 142             test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
 143                 return 0;
 144
 145         set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 146         reset_data = kzalloc(sizeof(*reset_data), GFP_ATOMIC);
 147         if (!reset_data)
 148                 return -ENOMEM;
 149         reset_data->accel_dev = accel_dev;
 150         init_completion(&reset_data->compl);
 151         reset_data->mode = mode;
 152         INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
 153         queue_work(device_reset_wq, &reset_data->reset_work);
 154
 155         /* If in sync mode wait for the result */
 156         if (mode == ADF_DEV_RESET_SYNC) {
 157                 int ret = 0;
 158                 /* Maximum device reset time is 10 seconds */
 159                 unsigned long wait_jiffies = msecs_to_jiffies(10000);
 160                 unsigned long timeout = wait_for_completion_timeout(
 161                                    &reset_data->compl, wait_jiffies);
 162                 if (!timeout) {
 163                         dev_err(&GET_DEV(accel_dev),
 164                                 "Reset device timeout expired\n");
 165                         ret = -EFAULT;
 166                 }
 167                 kfree(reset_data);
 168                 return ret;
 169         }
 170         return 0;
 171 }
 172
 173 static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
 174 {
 175         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
 176
 177         if (!accel_dev) {
 178                 pr_err("QAT: Can't find acceleration device\n");
 179                 return PCI_ERS_RESULT_DISCONNECT;
 180         }
 181         pci_cleanup_aer_uncorrect_error_status(pdev);
 182         if (adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_SYNC))
 183                 return PCI_ERS_RESULT_DISCONNECT;
 184
 185         return PCI_ERS_RESULT_RECOVERED;
 186 }
 187
 188 static void adf_resume(struct pci_dev *pdev)
 189 {
 190         dev_info(&pdev->dev, "Acceleration driver reset completed\n");
 191         dev_info(&pdev->dev, "Device is up and runnig\n");
 192 }
 193
 194 static struct pci_error_handlers adf_err_handler = {
 195         .error_detected = adf_error_detected,
 196         .slot_reset = adf_slot_reset,
 197         .resume = adf_resume,
 198 };
 199
 200 /**
 201  * adf_enable_aer() - Enable Advance Error Reporting for acceleration device
 202  * @accel_dev:  Pointer to acceleration device.
 203  * @adf:        PCI device driver owning the given acceleration device.
 204  *
 205  * Function enables PCI Advance Error Reporting for the
 206  * QAT acceleration device accel_dev.
 207  * To be used by QAT device specific drivers.
 208  *
 209  * Return: 0 on success, error code othewise.
 210  */
 211 int adf_enable_aer(struct adf_accel_dev *accel_dev, struct pci_driver *adf)
 212 {
 213         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 214
 215         adf->err_handler = &adf_err_handler;
 216         pci_enable_pcie_error_reporting(pdev);
 217         return 0;
 218 }
 219 EXPORT_SYMBOL_GPL(adf_enable_aer);
 220
 221 /**
 222  * adf_disable_aer() - Enable Advance Error Reporting for acceleration device
 223  * @accel_dev:  Pointer to acceleration device.
 224  *
 225  * Function disables PCI Advance Error Reporting for the
 226  * QAT acceleration device accel_dev.
 227  * To be used by QAT device specific drivers.
 228  *
 229  * Return: void
 230  */
 231 void adf_disable_aer(struct adf_accel_dev *accel_dev)
 232 {
 233         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 234
 235         pci_disable_pcie_error_reporting(pdev);
 236 }
 237 EXPORT_SYMBOL_GPL(adf_disable_aer);
 238
 239 int adf_init_aer(void)
 240 {
 241         device_reset_wq = create_workqueue("qat_device_reset_wq");
 242         return !device_reset_wq ? -EFAULT : 0;
 243 }
 244
 245 void adf_exit_aer(void)
 246 {
 247         if (device_reset_wq)
 248                 destroy_workqueue(device_reset_wq);
 249         device_reset_wq = NULL;
 250 }