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
 11static struct workqueue_struct *device_reset_wq;
 12
 13static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
 14					   pci_channel_state_t state)
 15{
 16	struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
 17
 18	dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
 19	if (!accel_dev) {
 20		dev_err(&pdev->dev, "Can't find acceleration device\n");
 21		return PCI_ERS_RESULT_DISCONNECT;
 22	}
 23
 24	if (state == pci_channel_io_perm_failure) {
 25		dev_err(&pdev->dev, "Can't recover from device error\n");
 26		return PCI_ERS_RESULT_DISCONNECT;
 27	}
 28
 29	return PCI_ERS_RESULT_NEED_RESET;
 30}
 31
 32/* reset dev data */
 33struct adf_reset_dev_data {
 34	int mode;
 35	struct adf_accel_dev *accel_dev;
 36	struct completion compl;
 37	struct work_struct reset_work;
 38};
 39
 40void adf_reset_sbr(struct adf_accel_dev *accel_dev)
 41{
 42	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 43	struct pci_dev *parent = pdev->bus->self;
 44	u16 bridge_ctl = 0;
 45
 46	if (!parent)
 47		parent = pdev;
 48
 49	if (!pci_wait_for_pending_transaction(pdev))
 50		dev_info(&GET_DEV(accel_dev),
 51			 "Transaction still in progress. Proceeding\n");
 52
 53	dev_info(&GET_DEV(accel_dev), "Secondary bus reset\n");
 54
 55	pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
 56	bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
 57	pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
 58	msleep(100);
 59	bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
 60	pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
 61	msleep(100);
 62}
 63EXPORT_SYMBOL_GPL(adf_reset_sbr);
 64
 65void adf_reset_flr(struct adf_accel_dev *accel_dev)
 66{
 67	pcie_flr(accel_to_pci_dev(accel_dev));
 68}
 69EXPORT_SYMBOL_GPL(adf_reset_flr);
 70
 71void adf_dev_restore(struct adf_accel_dev *accel_dev)
 72{
 73	struct adf_hw_device_data *hw_device = accel_dev->hw_device;
 74	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 75
 76	if (hw_device->reset_device) {
 77		dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
 78			 accel_dev->accel_id);
 79		hw_device->reset_device(accel_dev);
 80		pci_restore_state(pdev);
 81		pci_save_state(pdev);
 82	}
 83}
 84
 85static void adf_device_reset_worker(struct work_struct *work)
 86{
 87	struct adf_reset_dev_data *reset_data =
 88		  container_of(work, struct adf_reset_dev_data, reset_work);
 89	struct adf_accel_dev *accel_dev = reset_data->accel_dev;
 90
 91	adf_dev_restarting_notify(accel_dev);
 92	if (adf_dev_restart(accel_dev)) {
 93		/* The device hanged and we can't restart it so stop here */
 94		dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
 95		if (reset_data->mode == ADF_DEV_RESET_ASYNC)
 96			kfree(reset_data);
 97		WARN(1, "QAT: device restart failed. Device is unusable\n");
 98		return;
 99	}
100	adf_dev_restarted_notify(accel_dev);
101	clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
102
103	/* The dev is back alive. Notify the caller if in sync mode */
104	if (reset_data->mode == ADF_DEV_RESET_SYNC)
105		complete(&reset_data->compl);
106	else
107		kfree(reset_data);
108}
109
110static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
111				      enum adf_dev_reset_mode mode)
112{
113	struct adf_reset_dev_data *reset_data;
114
115	if (!adf_dev_started(accel_dev) ||
116	    test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
117		return 0;
118
119	set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
120	reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
121	if (!reset_data)
122		return -ENOMEM;
123	reset_data->accel_dev = accel_dev;
124	init_completion(&reset_data->compl);
125	reset_data->mode = mode;
126	INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
127	queue_work(device_reset_wq, &reset_data->reset_work);
128
129	/* If in sync mode wait for the result */
130	if (mode == ADF_DEV_RESET_SYNC) {
131		int ret = 0;
132		/* Maximum device reset time is 10 seconds */
133		unsigned long wait_jiffies = msecs_to_jiffies(10000);
134		unsigned long timeout = wait_for_completion_timeout(
135				   &reset_data->compl, wait_jiffies);
136		if (!timeout) {
137			dev_err(&GET_DEV(accel_dev),
138				"Reset device timeout expired\n");
139			ret = -EFAULT;
140		}
141		kfree(reset_data);
142		return ret;
143	}
144	return 0;
145}
146
147static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
148{
149	struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
150
151	if (!accel_dev) {
152		pr_err("QAT: Can't find acceleration device\n");
153		return PCI_ERS_RESULT_DISCONNECT;
154	}
155	if (adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_SYNC))
156		return PCI_ERS_RESULT_DISCONNECT;
157
158	return PCI_ERS_RESULT_RECOVERED;
159}
160
161static void adf_resume(struct pci_dev *pdev)
162{
163	dev_info(&pdev->dev, "Acceleration driver reset completed\n");
164	dev_info(&pdev->dev, "Device is up and running\n");
165}
166
167const struct pci_error_handlers adf_err_handler = {
168	.error_detected = adf_error_detected,
169	.slot_reset = adf_slot_reset,
170	.resume = adf_resume,
171};
172EXPORT_SYMBOL_GPL(adf_err_handler);
173
174int adf_init_aer(void)
175{
176	device_reset_wq = alloc_workqueue("qat_device_reset_wq",
177					  WQ_MEM_RECLAIM, 0);
178	return !device_reset_wq ? -EFAULT : 0;
179}
180
181void adf_exit_aer(void)
182{
183	if (device_reset_wq)
184		destroy_workqueue(device_reset_wq);
185	device_reset_wq = NULL;
186}