2 This file is provided under a dual BSD/GPLv2 license. When using or
3 redistributing this file, you may do so under either license.
6 Copyright(c) 2014 Intel Corporation.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of version 2 of the GNU General Public License as
9 published by the Free Software Foundation.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
20 Copyright(c) 2014 Intel Corporation.
21 Redistribution and use in source and binary forms, with or without
22 modification, are permitted provided that the following conditions
25 * Redistributions of source code must retain the above copyright
26 notice, this list of conditions and the following disclaimer.
27 * Redistributions in binary form must reproduce the above copyright
28 notice, this list of conditions and the following disclaimer in
29 the documentation and/or other materials provided with the
31 * Neither the name of Intel Corporation nor the names of its
32 contributors may be used to endorse or promote products derived
33 from this software without specific prior written permission.
35 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
47 #include <linux/kernel.h>
48 #include <linux/pci.h>
49 #include <linux/aer.h>
50 #include <linux/completion.h>
51 #include <linux/workqueue.h>
52 #include <linux/delay.h>
53 #include "adf_accel_devices.h"
54 #include "adf_common_drv.h"
56 static struct workqueue_struct *device_reset_wq;
58 static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
59 pci_channel_state_t state)
61 struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
63 dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
65 dev_err(&pdev->dev, "Can't find acceleration device\n");
66 return PCI_ERS_RESULT_DISCONNECT;
69 if (state == pci_channel_io_perm_failure) {
70 dev_err(&pdev->dev, "Can't recover from device error\n");
71 return PCI_ERS_RESULT_DISCONNECT;
74 return PCI_ERS_RESULT_NEED_RESET;
78 struct adf_reset_dev_data {
80 struct adf_accel_dev *accel_dev;
81 struct completion compl;
82 struct work_struct reset_work;
85 static void adf_dev_restore(struct adf_accel_dev *accel_dev)
87 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
88 struct pci_dev *parent = pdev->bus->self;
89 uint16_t bridge_ctl = 0;
91 dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
97 if (!pci_wait_for_pending_transaction(pdev))
98 dev_info(&GET_DEV(accel_dev),
99 "Transaction still in progress. Proceeding\n");
101 pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
102 bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
103 pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
105 bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
106 pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
108 pci_restore_state(pdev);
109 pci_save_state(pdev);
112 static void adf_device_reset_worker(struct work_struct *work)
114 struct adf_reset_dev_data *reset_data =
115 container_of(work, struct adf_reset_dev_data, reset_work);
116 struct adf_accel_dev *accel_dev = reset_data->accel_dev;
118 adf_dev_restarting_notify(accel_dev);
119 adf_dev_stop(accel_dev);
120 adf_dev_shutdown(accel_dev);
121 adf_dev_restore(accel_dev);
122 if (adf_dev_init(accel_dev) || adf_dev_start(accel_dev)) {
123 /* The device hanged and we can't restart it so stop here */
124 dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
126 WARN(1, "QAT: device restart failed. Device is unusable\n");
129 adf_dev_restarted_notify(accel_dev);
130 clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
132 /* The dev is back alive. Notify the caller if in sync mode */
133 if (reset_data->mode == ADF_DEV_RESET_SYNC)
134 complete(&reset_data->compl);
139 static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
140 enum adf_dev_reset_mode mode)
142 struct adf_reset_dev_data *reset_data;
144 if (!adf_dev_started(accel_dev) ||
145 test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
148 set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
149 reset_data = kzalloc(sizeof(*reset_data), GFP_ATOMIC);
152 reset_data->accel_dev = accel_dev;
153 init_completion(&reset_data->compl);
154 reset_data->mode = mode;
155 INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
156 queue_work(device_reset_wq, &reset_data->reset_work);
158 /* If in sync mode wait for the result */
159 if (mode == ADF_DEV_RESET_SYNC) {
161 /* Maximum device reset time is 10 seconds */
162 unsigned long wait_jiffies = msecs_to_jiffies(10000);
163 unsigned long timeout = wait_for_completion_timeout(
164 &reset_data->compl, wait_jiffies);
166 dev_err(&GET_DEV(accel_dev),
167 "Reset device timeout expired\n");
176 static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
178 struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
181 pr_err("QAT: Can't find acceleration device\n");
182 return PCI_ERS_RESULT_DISCONNECT;
184 pci_cleanup_aer_uncorrect_error_status(pdev);
185 if (adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_SYNC))
186 return PCI_ERS_RESULT_DISCONNECT;
188 return PCI_ERS_RESULT_RECOVERED;
191 static void adf_resume(struct pci_dev *pdev)
193 dev_info(&pdev->dev, "Acceleration driver reset completed\n");
194 dev_info(&pdev->dev, "Device is up and runnig\n");
197 static struct pci_error_handlers adf_err_handler = {
198 .error_detected = adf_error_detected,
199 .slot_reset = adf_slot_reset,
200 .resume = adf_resume,
204 * adf_enable_aer() - Enable Advance Error Reporting for acceleration device
205 * @accel_dev: Pointer to acceleration device.
206 * @adf: PCI device driver owning the given acceleration device.
208 * Function enables PCI Advance Error Reporting for the
209 * QAT acceleration device accel_dev.
210 * To be used by QAT device specific drivers.
212 * Return: 0 on success, error code otherwise.
214 int adf_enable_aer(struct adf_accel_dev *accel_dev, struct pci_driver *adf)
216 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
218 adf->err_handler = &adf_err_handler;
219 pci_enable_pcie_error_reporting(pdev);
222 EXPORT_SYMBOL_GPL(adf_enable_aer);
225 * adf_disable_aer() - Enable Advance Error Reporting for acceleration device
226 * @accel_dev: Pointer to acceleration device.
228 * Function disables PCI Advance Error Reporting for the
229 * QAT acceleration device accel_dev.
230 * To be used by QAT device specific drivers.
234 void adf_disable_aer(struct adf_accel_dev *accel_dev)
236 struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
238 pci_disable_pcie_error_reporting(pdev);
240 EXPORT_SYMBOL_GPL(adf_disable_aer);
242 int adf_init_aer(void)
244 device_reset_wq = create_workqueue("qat_device_reset_wq");
245 return !device_reset_wq ? -EFAULT : 0;
248 void adf_exit_aer(void)
251 destroy_workqueue(device_reset_wq);
252 device_reset_wq = NULL;