272 lines
8.4 KiB
C
272 lines
8.4 KiB
C
/*
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This file is provided under a dual BSD/GPLv2 license. When using or
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redistributing this file, you may do so under either license.
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GPL LICENSE SUMMARY
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Copyright(c) 2014 Intel Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Contact Information:
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qat-linux@intel.com
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BSD LICENSE
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Copyright(c) 2014 Intel Corporation.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/aer.h>
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#include <linux/completion.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include "adf_accel_devices.h"
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#include "adf_common_drv.h"
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static struct workqueue_struct *device_reset_wq;
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static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
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pci_channel_state_t state)
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{
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struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
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dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
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if (!accel_dev) {
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dev_err(&pdev->dev, "Can't find acceleration device\n");
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return PCI_ERS_RESULT_DISCONNECT;
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}
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if (state == pci_channel_io_perm_failure) {
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dev_err(&pdev->dev, "Can't recover from device error\n");
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return PCI_ERS_RESULT_DISCONNECT;
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}
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return PCI_ERS_RESULT_NEED_RESET;
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}
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/* reset dev data */
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struct adf_reset_dev_data {
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int mode;
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struct adf_accel_dev *accel_dev;
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struct completion compl;
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struct work_struct reset_work;
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};
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void adf_reset_sbr(struct adf_accel_dev *accel_dev)
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{
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struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
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struct pci_dev *parent = pdev->bus->self;
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uint16_t bridge_ctl = 0;
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if (!parent)
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parent = pdev;
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if (!pci_wait_for_pending_transaction(pdev))
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dev_info(&GET_DEV(accel_dev),
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"Transaction still in progress. Proceeding\n");
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dev_info(&GET_DEV(accel_dev), "Secondary bus reset\n");
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pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
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bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
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pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
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msleep(100);
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bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
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pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
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msleep(100);
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}
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EXPORT_SYMBOL_GPL(adf_reset_sbr);
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void adf_reset_flr(struct adf_accel_dev *accel_dev)
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{
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pcie_flr(accel_to_pci_dev(accel_dev));
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}
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EXPORT_SYMBOL_GPL(adf_reset_flr);
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void adf_dev_restore(struct adf_accel_dev *accel_dev)
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{
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struct adf_hw_device_data *hw_device = accel_dev->hw_device;
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struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
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if (hw_device->reset_device) {
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dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
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accel_dev->accel_id);
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hw_device->reset_device(accel_dev);
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pci_restore_state(pdev);
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pci_save_state(pdev);
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}
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}
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static void adf_device_reset_worker(struct work_struct *work)
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{
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struct adf_reset_dev_data *reset_data =
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container_of(work, struct adf_reset_dev_data, reset_work);
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struct adf_accel_dev *accel_dev = reset_data->accel_dev;
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adf_dev_restarting_notify(accel_dev);
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adf_dev_stop(accel_dev);
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adf_dev_shutdown(accel_dev);
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if (adf_dev_init(accel_dev) || adf_dev_start(accel_dev)) {
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/* The device hanged and we can't restart it so stop here */
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dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
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kfree(reset_data);
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WARN(1, "QAT: device restart failed. Device is unusable\n");
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return;
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}
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adf_dev_restarted_notify(accel_dev);
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clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
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/* The dev is back alive. Notify the caller if in sync mode */
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if (reset_data->mode == ADF_DEV_RESET_SYNC)
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complete(&reset_data->compl);
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else
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kfree(reset_data);
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}
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static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
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enum adf_dev_reset_mode mode)
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{
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struct adf_reset_dev_data *reset_data;
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if (!adf_dev_started(accel_dev) ||
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test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
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return 0;
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set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
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reset_data = kzalloc(sizeof(*reset_data), GFP_ATOMIC);
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if (!reset_data)
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return -ENOMEM;
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reset_data->accel_dev = accel_dev;
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init_completion(&reset_data->compl);
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reset_data->mode = mode;
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INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
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queue_work(device_reset_wq, &reset_data->reset_work);
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/* If in sync mode wait for the result */
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if (mode == ADF_DEV_RESET_SYNC) {
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int ret = 0;
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/* Maximum device reset time is 10 seconds */
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unsigned long wait_jiffies = msecs_to_jiffies(10000);
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unsigned long timeout = wait_for_completion_timeout(
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&reset_data->compl, wait_jiffies);
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if (!timeout) {
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dev_err(&GET_DEV(accel_dev),
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"Reset device timeout expired\n");
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ret = -EFAULT;
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}
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kfree(reset_data);
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return ret;
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}
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return 0;
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}
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static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
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{
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struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
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if (!accel_dev) {
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pr_err("QAT: Can't find acceleration device\n");
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return PCI_ERS_RESULT_DISCONNECT;
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}
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pci_cleanup_aer_uncorrect_error_status(pdev);
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if (adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_SYNC))
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return PCI_ERS_RESULT_DISCONNECT;
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return PCI_ERS_RESULT_RECOVERED;
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}
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static void adf_resume(struct pci_dev *pdev)
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{
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dev_info(&pdev->dev, "Acceleration driver reset completed\n");
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dev_info(&pdev->dev, "Device is up and running\n");
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}
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static const struct pci_error_handlers adf_err_handler = {
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.error_detected = adf_error_detected,
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.slot_reset = adf_slot_reset,
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.resume = adf_resume,
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};
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/**
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* adf_enable_aer() - Enable Advance Error Reporting for acceleration device
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* @accel_dev: Pointer to acceleration device.
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* @adf: PCI device driver owning the given acceleration device.
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*
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* Function enables PCI Advance Error Reporting for the
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* QAT acceleration device accel_dev.
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* To be used by QAT device specific drivers.
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*
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* Return: 0 on success, error code otherwise.
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*/
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int adf_enable_aer(struct adf_accel_dev *accel_dev, struct pci_driver *adf)
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{
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struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
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adf->err_handler = &adf_err_handler;
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pci_enable_pcie_error_reporting(pdev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(adf_enable_aer);
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/**
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* adf_disable_aer() - Enable Advance Error Reporting for acceleration device
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* @accel_dev: Pointer to acceleration device.
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*
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* Function disables PCI Advance Error Reporting for the
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* QAT acceleration device accel_dev.
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* To be used by QAT device specific drivers.
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*
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* Return: void
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*/
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void adf_disable_aer(struct adf_accel_dev *accel_dev)
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{
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struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
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pci_disable_pcie_error_reporting(pdev);
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}
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EXPORT_SYMBOL_GPL(adf_disable_aer);
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int adf_init_aer(void)
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{
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device_reset_wq = alloc_workqueue("qat_device_reset_wq",
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WQ_MEM_RECLAIM, 0);
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return !device_reset_wq ? -EFAULT : 0;
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}
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void adf_exit_aer(void)
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{
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if (device_reset_wq)
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destroy_workqueue(device_reset_wq);
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device_reset_wq = NULL;
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}
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