drivers/crypto/qat/qat_common/adf_aer.c - kernel/quantenna - Git at Google

 /*
   This file is provided under a dual BSD/GPLv2 license.  When using or
   redistributing this file, you may do so under either license.

   GPL LICENSE SUMMARY
   Copyright(c) 2014 Intel Corporation.
   This program is free software; you can redistribute it and/or modify
   it under the terms of version 2 of the GNU General Public License as
   published by the Free Software Foundation.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   Contact Information:
   qat-linux@intel.com

   BSD LICENSE
   Copyright(c) 2014 Intel Corporation.
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

     * Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
     * Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in
       the documentation and/or other materials provided with the
       distribution.
     * Neither the name of Intel Corporation nor the names of its
       contributors may be used to endorse or promote products derived
       from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 #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_dev_restore(struct adf_accel_dev *accel_dev)
 {
 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 	struct pci_dev *parent = pdev->bus->self;
 	uint16_t bridge_ctl = 0;

 	if (accel_dev->is_vf)
 		return;

 	dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
 		 accel_dev->accel_id);

 	if (!parent)
 		parent = pdev;

 	if (!pci_wait_for_pending_transaction(pdev))
 		dev_info(&GET_DEV(accel_dev),
 			 "Transaction still in progress. Proceeding\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);
 	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_ATOMIC);
 	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;
 	}
 	pci_cleanup_aer_uncorrect_error_status(pdev);
 	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 runnig\n");
 }

 static const struct pci_error_handlers adf_err_handler = {
 	.error_detected = adf_error_detected,
 	.slot_reset = adf_slot_reset,
 	.resume = adf_resume,
 };

 /**
  * adf_enable_aer() - Enable Advance Error Reporting for acceleration device
  * @accel_dev:  Pointer to acceleration device.
  * @adf:        PCI device driver owning the given acceleration device.
  *
  * Function enables PCI Advance Error Reporting for the
  * QAT acceleration device accel_dev.
  * To be used by QAT device specific drivers.
  *
  * Return: 0 on success, error code otherwise.
  */
 int adf_enable_aer(struct adf_accel_dev *accel_dev, struct pci_driver *adf)
 {
 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);

 	adf->err_handler = &adf_err_handler;
 	pci_enable_pcie_error_reporting(pdev);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(adf_enable_aer);

 /**
  * adf_disable_aer() - Enable 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 = create_workqueue("qat_device_reset_wq");
 	return !device_reset_wq ? -EFAULT : 0;
 }

 void adf_exit_aer(void)
 {
 	if (device_reset_wq)
 		destroy_workqueue(device_reset_wq);
 	device_reset_wq = NULL;
 }
	/*
	This file is provided under a dual BSD/GPLv2 license. When using or
	redistributing this file, you may do so under either license.

	GPL LICENSE SUMMARY
	Copyright(c) 2014 Intel Corporation.
	This program is free software; you can redistribute it and/or modify
	it under the terms of version 2 of the GNU General Public License as
	published by the Free Software Foundation.

	This program is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	General Public License for more details.

	Contact Information:
	qat-linux@intel.com

	BSD LICENSE
	Copyright(c) 2014 Intel Corporation.
	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions
	are met:

	* Redistributions of source code must retain the above copyright
	notice, this list of conditions and the following disclaimer.
	* Redistributions in binary form must reproduce the above copyright
	notice, this list of conditions and the following disclaimer in
	the documentation and/or other materials provided with the
	distribution.
	* Neither the name of Intel Corporation nor the names of its
	contributors may be used to endorse or promote products derived
	from this software without specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	#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_dev_restore(struct adf_accel_dev *accel_dev)
	{
	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
	struct pci_dev *parent = pdev->bus->self;
	uint16_t bridge_ctl = 0;

	if (accel_dev->is_vf)
	return;

	dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
	accel_dev->accel_id);

	if (!parent)
	parent = pdev;

	if (!pci_wait_for_pending_transaction(pdev))
	dev_info(&GET_DEV(accel_dev),
	"Transaction still in progress. Proceeding\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);
	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_ATOMIC);
	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;
	}
	pci_cleanup_aer_uncorrect_error_status(pdev);
	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 runnig\n");
	}

	static const struct pci_error_handlers adf_err_handler = {
	.error_detected = adf_error_detected,
	.slot_reset = adf_slot_reset,
	.resume = adf_resume,
	};

	/**
	* adf_enable_aer() - Enable Advance Error Reporting for acceleration device
	* @accel_dev: Pointer to acceleration device.
	* @adf: PCI device driver owning the given acceleration device.
	*
	* Function enables PCI Advance Error Reporting for the
	* QAT acceleration device accel_dev.
	* To be used by QAT device specific drivers.
	*
	* Return: 0 on success, error code otherwise.
	*/
	int adf_enable_aer(struct adf_accel_dev accel_dev, struct pci_driver adf)
	{
	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);

	adf->err_handler = &adf_err_handler;
	pci_enable_pcie_error_reporting(pdev);
	return 0;
	}
	EXPORT_SYMBOL_GPL(adf_enable_aer);

	/**
	* adf_disable_aer() - Enable 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 = create_workqueue("qat_device_reset_wq");
	return !device_reset_wq ? -EFAULT : 0;
	}

	void adf_exit_aer(void)
	{
	if (device_reset_wq)
	destroy_workqueue(device_reset_wq);
	device_reset_wq = NULL;
	}