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