drivers/crypto/qat/qat_common/adf_aer.c

   1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
   2 /* Copyright(c) 2014 - 2020 Intel Corporation */
   3 #include <linux/kernel.h>
   4 #include <linux/pci.h>
   5 #include <linux/aer.h>
   6 #include <linux/completion.h>
   7 #include <linux/workqueue.h>
   8 #include <linux/delay.h>
   9 #include "adf_accel_devices.h"
  10 #include "adf_common_drv.h"
  11
  12 static struct workqueue_struct *device_reset_wq;
  13
  14 static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
  15                                            pci_channel_state_t state)
  16 {
  17         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
  18
  19         dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
  20         if (!accel_dev) {
  21                 dev_err(&pdev->dev, "Can't find acceleration device\n");
  22                 return PCI_ERS_RESULT_DISCONNECT;
  23         }
  24
  25         if (state == pci_channel_io_perm_failure) {
  26                 dev_err(&pdev->dev, "Can't recover from device error\n");
  27                 return PCI_ERS_RESULT_DISCONNECT;
  28         }
  29
  30         return PCI_ERS_RESULT_NEED_RESET;
  31 }
  32
  33 /* reset dev data */
  34 struct adf_reset_dev_data {
  35         int mode;
  36         struct adf_accel_dev *accel_dev;
  37         struct completion compl;
  38         struct work_struct reset_work;
  39 };
  40
  41 void adf_reset_sbr(struct adf_accel_dev *accel_dev)
  42 {
  43         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  44         struct pci_dev *parent = pdev->bus->self;
  45         u16 bridge_ctl = 0;
  46
  47         if (!parent)
  48                 parent = pdev;
  49
  50         if (!pci_wait_for_pending_transaction(pdev))
  51                 dev_info(&GET_DEV(accel_dev),
  52                          "Transaction still in progress. Proceeding\n");
  53
  54         dev_info(&GET_DEV(accel_dev), "Secondary bus reset\n");
  55
  56         pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
  57         bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
  58         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
  59         msleep(100);
  60         bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
  61         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
  62         msleep(100);
  63 }
  64 EXPORT_SYMBOL_GPL(adf_reset_sbr);
  65
  66 void adf_reset_flr(struct adf_accel_dev *accel_dev)
  67 {
  68         pcie_flr(accel_to_pci_dev(accel_dev));
  69 }
  70 EXPORT_SYMBOL_GPL(adf_reset_flr);
  71
  72 void adf_dev_restore(struct adf_accel_dev *accel_dev)
  73 {
  74         struct adf_hw_device_data *hw_device = accel_dev->hw_device;
  75         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  76
  77         if (hw_device->reset_device) {
  78                 dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
  79                          accel_dev->accel_id);
  80                 hw_device->reset_device(accel_dev);
  81                 pci_restore_state(pdev);
  82                 pci_save_state(pdev);
  83         }
  84 }
  85
  86 static void adf_device_reset_worker(struct work_struct *work)
  87 {
  88         struct adf_reset_dev_data *reset_data =
  89                   container_of(work, struct adf_reset_dev_data, reset_work);
  90         struct adf_accel_dev *accel_dev = reset_data->accel_dev;
  91
  92         adf_dev_restarting_notify(accel_dev);
  93         adf_dev_stop(accel_dev);
  94         adf_dev_shutdown(accel_dev);
  95         if (adf_dev_init(accel_dev) || adf_dev_start(accel_dev)) {
  96                 /* The device hanged and we can't restart it so stop here */
  97                 dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
  98                 kfree(reset_data);
  99                 WARN(1, "QAT: device restart failed. Device is unusable\n");
 100                 return;
 101         }
 102         adf_dev_restarted_notify(accel_dev);
 103         clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 104
 105         /* The dev is back alive. Notify the caller if in sync mode */
 106         if (reset_data->mode == ADF_DEV_RESET_SYNC)
 107                 complete(&reset_data->compl);
 108         else
 109                 kfree(reset_data);
 110 }
 111
 112 static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
 113                                       enum adf_dev_reset_mode mode)
 114 {
 115         struct adf_reset_dev_data *reset_data;
 116
 117         if (!adf_dev_started(accel_dev) ||
 118             test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
 119                 return 0;
 120
 121         set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 122         reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
 123         if (!reset_data)
 124                 return -ENOMEM;
 125         reset_data->accel_dev = accel_dev;
 126         init_completion(&reset_data->compl);
 127         reset_data->mode = mode;
 128         INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
 129         queue_work(device_reset_wq, &reset_data->reset_work);
 130
 131         /* If in sync mode wait for the result */
 132         if (mode == ADF_DEV_RESET_SYNC) {
 133                 int ret = 0;
 134                 /* Maximum device reset time is 10 seconds */
 135                 unsigned long wait_jiffies = msecs_to_jiffies(10000);
 136                 unsigned long timeout = wait_for_completion_timeout(
 137                                    &reset_data->compl, wait_jiffies);
 138                 if (!timeout) {
 139                         dev_err(&GET_DEV(accel_dev),
 140                                 "Reset device timeout expired\n");
 141                         ret = -EFAULT;
 142                 }
 143                 kfree(reset_data);
 144                 return ret;
 145         }
 146         return 0;
 147 }
 148
 149 static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
 150 {
 151         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
 152
 153         if (!accel_dev) {
 154                 pr_err("QAT: Can't find acceleration device\n");
 155                 return PCI_ERS_RESULT_DISCONNECT;
 156         }
 157         if (adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_SYNC))
 158                 return PCI_ERS_RESULT_DISCONNECT;
 159
 160         return PCI_ERS_RESULT_RECOVERED;
 161 }
 162
 163 static void adf_resume(struct pci_dev *pdev)
 164 {
 165         dev_info(&pdev->dev, "Acceleration driver reset completed\n");
 166         dev_info(&pdev->dev, "Device is up and running\n");
 167 }
 168
 169 static const struct pci_error_handlers adf_err_handler = {
 170         .error_detected = adf_error_detected,
 171         .slot_reset = adf_slot_reset,
 172         .resume = adf_resume,
 173 };
 174
 175 /**
 176  * adf_enable_aer() - Enable Advance Error Reporting for acceleration device
 177  * @accel_dev:  Pointer to acceleration device.
 178  *
 179  * Function enables PCI Advance Error Reporting for the
 180  * QAT acceleration device accel_dev.
 181  * To be used by QAT device specific drivers.
 182  *
 183  * Return: 0 on success, error code otherwise.
 184  */
 185 int adf_enable_aer(struct adf_accel_dev *accel_dev)
 186 {
 187         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 188         struct pci_driver *pdrv = pdev->driver;
 189
 190         pdrv->err_handler = &adf_err_handler;
 191         pci_enable_pcie_error_reporting(pdev);
 192         return 0;
 193 }
 194 EXPORT_SYMBOL_GPL(adf_enable_aer);
 195
 196 /**
 197  * adf_disable_aer() - Disable Advance Error Reporting for acceleration device
 198  * @accel_dev:  Pointer to acceleration device.
 199  *
 200  * Function disables PCI Advance Error Reporting for the
 201  * QAT acceleration device accel_dev.
 202  * To be used by QAT device specific drivers.
 203  *
 204  * Return: void
 205  */
 206 void adf_disable_aer(struct adf_accel_dev *accel_dev)
 207 {
 208         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 209
 210         pci_disable_pcie_error_reporting(pdev);
 211 }
 212 EXPORT_SYMBOL_GPL(adf_disable_aer);
 213
 214 int adf_init_aer(void)
 215 {
 216         device_reset_wq = alloc_workqueue("qat_device_reset_wq",
 217                                           WQ_MEM_RECLAIM, 0);
 218         return !device_reset_wq ? -EFAULT : 0;
 219 }
 220
 221 void adf_exit_aer(void)
 222 {
 223         if (device_reset_wq)
 224                 destroy_workqueue(device_reset_wq);
 225         device_reset_wq = NULL;
 226 }