drivers/crypto/intel/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/completion.h>
   6 #include <linux/workqueue.h>
   7 #include <linux/delay.h>
   8 #include "adf_accel_devices.h"
   9 #include "adf_common_drv.h"
  10 #include "adf_pfvf_pf_msg.h"
  11
  12 struct adf_fatal_error_data {
  13         struct adf_accel_dev *accel_dev;
  14         struct work_struct work;
  15 };
  16
  17 static struct workqueue_struct *device_reset_wq;
  18 static struct workqueue_struct *device_sriov_wq;
  19
  20 static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
  21                                            pci_channel_state_t state)
  22 {
  23         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
  24
  25         dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
  26         if (!accel_dev) {
  27                 dev_err(&pdev->dev, "Can't find acceleration device\n");
  28                 return PCI_ERS_RESULT_DISCONNECT;
  29         }
  30
  31         if (state == pci_channel_io_perm_failure) {
  32                 dev_err(&pdev->dev, "Can't recover from device error\n");
  33                 return PCI_ERS_RESULT_DISCONNECT;
  34         }
  35
  36         set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
  37         if (accel_dev->hw_device->exit_arb) {
  38                 dev_dbg(&pdev->dev, "Disabling arbitration\n");
  39                 accel_dev->hw_device->exit_arb(accel_dev);
  40         }
  41         adf_error_notifier(accel_dev);
  42         adf_pf2vf_notify_fatal_error(accel_dev);
  43         adf_dev_restarting_notify(accel_dev);
  44         adf_pf2vf_notify_restarting(accel_dev);
  45         adf_pf2vf_wait_for_restarting_complete(accel_dev);
  46         pci_clear_master(pdev);
  47         adf_dev_down(accel_dev, false);
  48
  49         return PCI_ERS_RESULT_NEED_RESET;
  50 }
  51
  52 /* reset dev data */
  53 struct adf_reset_dev_data {
  54         int mode;
  55         struct adf_accel_dev *accel_dev;
  56         struct completion compl;
  57         struct work_struct reset_work;
  58 };
  59
  60 /* sriov dev data */
  61 struct adf_sriov_dev_data {
  62         struct adf_accel_dev *accel_dev;
  63         struct completion compl;
  64         struct work_struct sriov_work;
  65 };
  66
  67 void adf_reset_sbr(struct adf_accel_dev *accel_dev)
  68 {
  69         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
  70         struct pci_dev *parent = pdev->bus->self;
  71         u16 bridge_ctl = 0;
  72
  73         if (!parent)
  74                 parent = pdev;
  75
  76         if (!pci_wait_for_pending_transaction(pdev))
  77                 dev_info(&GET_DEV(accel_dev),
  78                          "Transaction still in progress. Proceeding\n");
  79
  80         dev_info(&GET_DEV(accel_dev), "Secondary bus reset\n");
  81
  82         pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
  83         bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
  84         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
  85         msleep(100);
  86         bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
  87         pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
  88         msleep(100);
  89 }
  90 EXPORT_SYMBOL_GPL(adf_reset_sbr);
  91
  92 void adf_reset_flr(struct adf_accel_dev *accel_dev)
  93 {
  94         pcie_flr(accel_to_pci_dev(accel_dev));
  95 }
  96 EXPORT_SYMBOL_GPL(adf_reset_flr);
  97
  98 void adf_dev_restore(struct adf_accel_dev *accel_dev)
  99 {
 100         struct adf_hw_device_data *hw_device = accel_dev->hw_device;
 101         struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 102
 103         if (hw_device->reset_device) {
 104                 dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
 105                          accel_dev->accel_id);
 106                 hw_device->reset_device(accel_dev);
 107                 pci_restore_state(pdev);
 108                 pci_save_state(pdev);
 109         }
 110 }
 111
 112 static void adf_device_sriov_worker(struct work_struct *work)
 113 {
 114         struct adf_sriov_dev_data *sriov_data =
 115                 container_of(work, struct adf_sriov_dev_data, sriov_work);
 116
 117         adf_reenable_sriov(sriov_data->accel_dev);
 118         complete(&sriov_data->compl);
 119 }
 120
 121 static void adf_device_reset_worker(struct work_struct *work)
 122 {
 123         struct adf_reset_dev_data *reset_data =
 124                   container_of(work, struct adf_reset_dev_data, reset_work);
 125         struct adf_accel_dev *accel_dev = reset_data->accel_dev;
 126         unsigned long wait_jiffies = msecs_to_jiffies(10000);
 127         struct adf_sriov_dev_data sriov_data;
 128
 129         adf_dev_restarting_notify(accel_dev);
 130         if (adf_dev_restart(accel_dev)) {
 131                 /* The device hanged and we can't restart it so stop here */
 132                 dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
 133                 if (reset_data->mode == ADF_DEV_RESET_ASYNC ||
 134                     completion_done(&reset_data->compl))
 135                         kfree(reset_data);
 136                 WARN(1, "QAT: device restart failed. Device is unusable\n");
 137                 return;
 138         }
 139
 140         sriov_data.accel_dev = accel_dev;
 141         init_completion(&sriov_data.compl);
 142         INIT_WORK(&sriov_data.sriov_work, adf_device_sriov_worker);
 143         queue_work(device_sriov_wq, &sriov_data.sriov_work);
 144         if (wait_for_completion_timeout(&sriov_data.compl, wait_jiffies))
 145                 adf_pf2vf_notify_restarted(accel_dev);
 146
 147         adf_dev_restarted_notify(accel_dev);
 148         clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 149
 150         /*
 151          * The dev is back alive. Notify the caller if in sync mode
 152          *
 153          * If device restart will take a more time than expected,
 154          * the schedule_reset() function can timeout and exit. This can be
 155          * detected by calling the completion_done() function. In this case
 156          * the reset_data structure needs to be freed here.
 157          */
 158         if (reset_data->mode == ADF_DEV_RESET_ASYNC ||
 159             completion_done(&reset_data->compl))
 160                 kfree(reset_data);
 161         else
 162                 complete(&reset_data->compl);
 163 }
 164
 165 static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
 166                                       enum adf_dev_reset_mode mode)
 167 {
 168         struct adf_reset_dev_data *reset_data;
 169
 170         if (!adf_dev_started(accel_dev) ||
 171             test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
 172                 return 0;
 173
 174         set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 175         reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
 176         if (!reset_data)
 177                 return -ENOMEM;
 178         reset_data->accel_dev = accel_dev;
 179         init_completion(&reset_data->compl);
 180         reset_data->mode = mode;
 181         INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
 182         queue_work(device_reset_wq, &reset_data->reset_work);
 183
 184         /* If in sync mode wait for the result */
 185         if (mode == ADF_DEV_RESET_SYNC) {
 186                 int ret = 0;
 187                 /* Maximum device reset time is 10 seconds */
 188                 unsigned long wait_jiffies = msecs_to_jiffies(10000);
 189                 unsigned long timeout = wait_for_completion_timeout(
 190                                    &reset_data->compl, wait_jiffies);
 191                 if (!timeout) {
 192                         dev_err(&GET_DEV(accel_dev),
 193                                 "Reset device timeout expired\n");
 194                         ret = -EFAULT;
 195                 } else {
 196                         kfree(reset_data);
 197                 }
 198                 return ret;
 199         }
 200         return 0;
 201 }
 202
 203 static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
 204 {
 205         struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
 206         int res = 0;
 207
 208         if (!accel_dev) {
 209                 pr_err("QAT: Can't find acceleration device\n");
 210                 return PCI_ERS_RESULT_DISCONNECT;
 211         }
 212
 213         if (!pdev->is_busmaster)
 214                 pci_set_master(pdev);
 215         pci_restore_state(pdev);
 216         pci_save_state(pdev);
 217         res = adf_dev_up(accel_dev, false);
 218         if (res && res != -EALREADY)
 219                 return PCI_ERS_RESULT_DISCONNECT;
 220
 221         adf_reenable_sriov(accel_dev);
 222         adf_pf2vf_notify_restarted(accel_dev);
 223         adf_dev_restarted_notify(accel_dev);
 224         clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 225         return PCI_ERS_RESULT_RECOVERED;
 226 }
 227
 228 static void adf_resume(struct pci_dev *pdev)
 229 {
 230         dev_info(&pdev->dev, "Acceleration driver reset completed\n");
 231         dev_info(&pdev->dev, "Device is up and running\n");
 232 }
 233
 234 const struct pci_error_handlers adf_err_handler = {
 235         .error_detected = adf_error_detected,
 236         .slot_reset = adf_slot_reset,
 237         .resume = adf_resume,
 238 };
 239 EXPORT_SYMBOL_GPL(adf_err_handler);
 240
 241 int adf_dev_autoreset(struct adf_accel_dev *accel_dev)
 242 {
 243         if (accel_dev->autoreset_on_error)
 244                 return adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_ASYNC);
 245
 246         return 0;
 247 }
 248
 249 static void adf_notify_fatal_error_worker(struct work_struct *work)
 250 {
 251         struct adf_fatal_error_data *wq_data =
 252                         container_of(work, struct adf_fatal_error_data, work);
 253         struct adf_accel_dev *accel_dev = wq_data->accel_dev;
 254         struct adf_hw_device_data *hw_device = accel_dev->hw_device;
 255
 256         adf_error_notifier(accel_dev);
 257
 258         if (!accel_dev->is_vf) {
 259                 /* Disable arbitration to stop processing of new requests */
 260                 if (accel_dev->autoreset_on_error && hw_device->exit_arb)
 261                         hw_device->exit_arb(accel_dev);
 262                 if (accel_dev->pf.vf_info)
 263                         adf_pf2vf_notify_fatal_error(accel_dev);
 264                 adf_dev_autoreset(accel_dev);
 265         }
 266
 267         kfree(wq_data);
 268 }
 269
 270 int adf_notify_fatal_error(struct adf_accel_dev *accel_dev)
 271 {
 272         struct adf_fatal_error_data *wq_data;
 273
 274         wq_data = kzalloc(sizeof(*wq_data), GFP_ATOMIC);
 275         if (!wq_data)
 276                 return -ENOMEM;
 277
 278         wq_data->accel_dev = accel_dev;
 279         INIT_WORK(&wq_data->work, adf_notify_fatal_error_worker);
 280         adf_misc_wq_queue_work(&wq_data->work);
 281
 282         return 0;
 283 }
 284
 285 int adf_init_aer(void)
 286 {
 287         device_reset_wq = alloc_workqueue("qat_device_reset_wq",
 288                                           WQ_MEM_RECLAIM, 0);
 289         if (!device_reset_wq)
 290                 return -EFAULT;
 291
 292         device_sriov_wq = alloc_workqueue("qat_device_sriov_wq", 0, 0);
 293         if (!device_sriov_wq)
 294                 return -EFAULT;
 295
 296         return 0;
 297 }
 298
 299 void adf_exit_aer(void)
 300 {
 301         if (device_reset_wq)
 302                 destroy_workqueue(device_reset_wq);
 303         device_reset_wq = NULL;
 304
 305         if (device_sriov_wq)
 306                 destroy_workqueue(device_sriov_wq);
 307         device_sriov_wq = NULL;
 308 }