diff options
Diffstat (limited to 'drivers/crypto/qat/qat_common/adf_aer.c')
| -rw-r--r-- | drivers/crypto/qat/qat_common/adf_aer.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/drivers/crypto/qat/qat_common/adf_aer.c b/drivers/crypto/qat/qat_common/adf_aer.c new file mode 100644 index 000000000..fe9bb2f35 --- /dev/null +++ b/drivers/crypto/qat/qat_common/adf_aer.c @@ -0,0 +1,222 @@ +// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only) +/* Copyright(c) 2014 - 2020 Intel Corporation */ +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/aer.h> +#include <linux/completion.h> +#include <linux/workqueue.h> +#include <linux/delay.h> +#include "adf_accel_devices.h" +#include "adf_common_drv.h" + +static struct workqueue_struct *device_reset_wq; + +static pci_ers_result_t adf_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev); + + dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n"); + if (!accel_dev) { + dev_err(&pdev->dev, "Can't find acceleration device\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + + if (state == pci_channel_io_perm_failure) { + dev_err(&pdev->dev, "Can't recover from device error\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + + return PCI_ERS_RESULT_NEED_RESET; +} + +/* reset dev data */ +struct adf_reset_dev_data { + int mode; + struct adf_accel_dev *accel_dev; + struct completion compl; + struct work_struct reset_work; +}; + +void adf_reset_sbr(struct adf_accel_dev *accel_dev) +{ + struct pci_dev *pdev = accel_to_pci_dev(accel_dev); + struct pci_dev *parent = pdev->bus->self; + u16 bridge_ctl = 0; + + if (!parent) + parent = pdev; + + if (!pci_wait_for_pending_transaction(pdev)) + dev_info(&GET_DEV(accel_dev), + "Transaction still in progress. Proceeding\n"); + + dev_info(&GET_DEV(accel_dev), "Secondary bus reset\n"); + + pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl); + bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET; + pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl); + msleep(100); + bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET; + pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl); + msleep(100); +} +EXPORT_SYMBOL_GPL(adf_reset_sbr); + +void adf_reset_flr(struct adf_accel_dev *accel_dev) +{ + pcie_flr(accel_to_pci_dev(accel_dev)); +} +EXPORT_SYMBOL_GPL(adf_reset_flr); + +void adf_dev_restore(struct adf_accel_dev *accel_dev) +{ + struct adf_hw_device_data *hw_device = accel_dev->hw_device; + struct pci_dev *pdev = accel_to_pci_dev(accel_dev); + + if (hw_device->reset_device) { + dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n", + accel_dev->accel_id); + hw_device->reset_device(accel_dev); + pci_restore_state(pdev); + pci_save_state(pdev); + } +} + +static void adf_device_reset_worker(struct work_struct *work) +{ + struct adf_reset_dev_data *reset_data = + container_of(work, struct adf_reset_dev_data, reset_work); + struct adf_accel_dev *accel_dev = reset_data->accel_dev; + + adf_dev_restarting_notify(accel_dev); + adf_dev_stop(accel_dev); + adf_dev_shutdown(accel_dev); + if (adf_dev_init(accel_dev) || adf_dev_start(accel_dev)) { + /* The device hanged and we can't restart it so stop here */ + dev_err(&GET_DEV(accel_dev), "Restart device failed\n"); + kfree(reset_data); + WARN(1, "QAT: device restart failed. Device is unusable\n"); + return; + } + adf_dev_restarted_notify(accel_dev); + clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status); + + /* The dev is back alive. Notify the caller if in sync mode */ + if (reset_data->mode == ADF_DEV_RESET_SYNC) + complete(&reset_data->compl); + else + kfree(reset_data); +} + +static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev, + enum adf_dev_reset_mode mode) +{ + struct adf_reset_dev_data *reset_data; + + if (!adf_dev_started(accel_dev) || + test_bit(ADF_STATUS_RESTARTING, &accel_dev->status)) + return 0; + + set_bit(ADF_STATUS_RESTARTING, &accel_dev->status); + reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL); + if (!reset_data) + return -ENOMEM; + reset_data->accel_dev = accel_dev; + init_completion(&reset_data->compl); + reset_data->mode = mode; + INIT_WORK(&reset_data->reset_work, adf_device_reset_worker); + queue_work(device_reset_wq, &reset_data->reset_work); + + /* If in sync mode wait for the result */ + if (mode == ADF_DEV_RESET_SYNC) { + int ret = 0; + /* Maximum device reset time is 10 seconds */ + unsigned long wait_jiffies = msecs_to_jiffies(10000); + unsigned long timeout = wait_for_completion_timeout( + &reset_data->compl, wait_jiffies); + if (!timeout) { + dev_err(&GET_DEV(accel_dev), + "Reset device timeout expired\n"); + ret = -EFAULT; + } + kfree(reset_data); + return ret; + } + return 0; +} + +static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev) +{ + struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev); + + if (!accel_dev) { + pr_err("QAT: Can't find acceleration device\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + if (adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_SYNC)) + return PCI_ERS_RESULT_DISCONNECT; + + return PCI_ERS_RESULT_RECOVERED; +} + +static void adf_resume(struct pci_dev *pdev) +{ + dev_info(&pdev->dev, "Acceleration driver reset completed\n"); + dev_info(&pdev->dev, "Device is up and running\n"); +} + +const struct pci_error_handlers adf_err_handler = { + .error_detected = adf_error_detected, + .slot_reset = adf_slot_reset, + .resume = adf_resume, +}; +EXPORT_SYMBOL_GPL(adf_err_handler); + +/** + * adf_enable_aer() - Enable Advance Error Reporting for acceleration device + * @accel_dev: Pointer to acceleration device. + * + * Function enables PCI Advance Error Reporting for the + * QAT acceleration device accel_dev. + * To be used by QAT device specific drivers. + */ +void adf_enable_aer(struct adf_accel_dev *accel_dev) +{ + struct pci_dev *pdev = accel_to_pci_dev(accel_dev); + + pci_enable_pcie_error_reporting(pdev); +} +EXPORT_SYMBOL_GPL(adf_enable_aer); + +/** + * adf_disable_aer() - Disable Advance Error Reporting for acceleration device + * @accel_dev: Pointer to acceleration device. + * + * Function disables PCI Advance Error Reporting for the + * QAT acceleration device accel_dev. + * To be used by QAT device specific drivers. + * + * Return: void + */ +void adf_disable_aer(struct adf_accel_dev *accel_dev) +{ + struct pci_dev *pdev = accel_to_pci_dev(accel_dev); + + pci_disable_pcie_error_reporting(pdev); +} +EXPORT_SYMBOL_GPL(adf_disable_aer); + +int adf_init_aer(void) +{ + device_reset_wq = alloc_workqueue("qat_device_reset_wq", + WQ_MEM_RECLAIM, 0); + return !device_reset_wq ? -EFAULT : 0; +} + +void adf_exit_aer(void) +{ + if (device_reset_wq) + destroy_workqueue(device_reset_wq); + device_reset_wq = NULL; +} |