xref: /linux/drivers/crypto/intel/qat/qat_common/adf_aer.c (revision 3fd6c59042dbba50391e30862beac979491145fe)
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 #include "adf_pfvf_pf_msg.h"
11 
12 struct adf_fatal_error_data {
13 	struct adf_accel_dev *accel_dev;
14 	struct work_struct work;
15 };
16 
17 static struct workqueue_struct *device_reset_wq;
18 static struct workqueue_struct *device_sriov_wq;
19 
adf_error_detected(struct pci_dev * pdev,pci_channel_state_t state)20 static pci_ers_result_t adf_error_detected(struct pci_dev *pdev,
21 					   pci_channel_state_t state)
22 {
23 	struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
24 
25 	dev_info(&pdev->dev, "Acceleration driver hardware error detected.\n");
26 	if (!accel_dev) {
27 		dev_err(&pdev->dev, "Can't find acceleration device\n");
28 		return PCI_ERS_RESULT_DISCONNECT;
29 	}
30 
31 	if (state == pci_channel_io_perm_failure) {
32 		dev_err(&pdev->dev, "Can't recover from device error\n");
33 		return PCI_ERS_RESULT_DISCONNECT;
34 	}
35 
36 	set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
37 	if (accel_dev->hw_device->exit_arb) {
38 		dev_dbg(&pdev->dev, "Disabling arbitration\n");
39 		accel_dev->hw_device->exit_arb(accel_dev);
40 	}
41 	adf_error_notifier(accel_dev);
42 	adf_pf2vf_notify_fatal_error(accel_dev);
43 	adf_dev_restarting_notify(accel_dev);
44 	adf_pf2vf_notify_restarting(accel_dev);
45 	adf_pf2vf_wait_for_restarting_complete(accel_dev);
46 	pci_clear_master(pdev);
47 	adf_dev_down(accel_dev);
48 
49 	return PCI_ERS_RESULT_NEED_RESET;
50 }
51 
52 /* reset dev data */
53 struct adf_reset_dev_data {
54 	int mode;
55 	struct adf_accel_dev *accel_dev;
56 	struct completion compl;
57 	struct work_struct reset_work;
58 };
59 
60 /* sriov dev data */
61 struct adf_sriov_dev_data {
62 	struct adf_accel_dev *accel_dev;
63 	struct completion compl;
64 	struct work_struct sriov_work;
65 };
66 
adf_reset_sbr(struct adf_accel_dev * accel_dev)67 void adf_reset_sbr(struct adf_accel_dev *accel_dev)
68 {
69 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
70 	struct pci_dev *parent = pdev->bus->self;
71 	u16 bridge_ctl = 0;
72 
73 	if (!parent)
74 		parent = pdev;
75 
76 	if (!pci_wait_for_pending_transaction(pdev))
77 		dev_info(&GET_DEV(accel_dev),
78 			 "Transaction still in progress. Proceeding\n");
79 
80 	dev_info(&GET_DEV(accel_dev), "Secondary bus reset\n");
81 
82 	pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);
83 	bridge_ctl |= PCI_BRIDGE_CTL_BUS_RESET;
84 	pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
85 	msleep(100);
86 	bridge_ctl &= ~PCI_BRIDGE_CTL_BUS_RESET;
87 	pci_write_config_word(parent, PCI_BRIDGE_CONTROL, bridge_ctl);
88 	msleep(100);
89 }
90 EXPORT_SYMBOL_GPL(adf_reset_sbr);
91 
adf_reset_flr(struct adf_accel_dev * accel_dev)92 void adf_reset_flr(struct adf_accel_dev *accel_dev)
93 {
94 	pcie_flr(accel_to_pci_dev(accel_dev));
95 }
96 EXPORT_SYMBOL_GPL(adf_reset_flr);
97 
adf_dev_restore(struct adf_accel_dev * accel_dev)98 void adf_dev_restore(struct adf_accel_dev *accel_dev)
99 {
100 	struct adf_hw_device_data *hw_device = accel_dev->hw_device;
101 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
102 
103 	if (hw_device->reset_device) {
104 		dev_info(&GET_DEV(accel_dev), "Resetting device qat_dev%d\n",
105 			 accel_dev->accel_id);
106 		hw_device->reset_device(accel_dev);
107 		pci_restore_state(pdev);
108 		pci_save_state(pdev);
109 	}
110 }
111 
adf_device_sriov_worker(struct work_struct * work)112 static void adf_device_sriov_worker(struct work_struct *work)
113 {
114 	struct adf_sriov_dev_data *sriov_data =
115 		container_of(work, struct adf_sriov_dev_data, sriov_work);
116 
117 	adf_reenable_sriov(sriov_data->accel_dev);
118 	complete(&sriov_data->compl);
119 }
120 
adf_device_reset_worker(struct work_struct * work)121 static void adf_device_reset_worker(struct work_struct *work)
122 {
123 	struct adf_reset_dev_data *reset_data =
124 		  container_of(work, struct adf_reset_dev_data, reset_work);
125 	struct adf_accel_dev *accel_dev = reset_data->accel_dev;
126 	unsigned long wait_jiffies = msecs_to_jiffies(10000);
127 	struct adf_sriov_dev_data sriov_data;
128 
129 	adf_dev_restarting_notify(accel_dev);
130 	if (adf_dev_restart(accel_dev)) {
131 		/* The device hanged and we can't restart it so stop here */
132 		dev_err(&GET_DEV(accel_dev), "Restart device failed\n");
133 		if (reset_data->mode == ADF_DEV_RESET_ASYNC)
134 			kfree(reset_data);
135 		WARN(1, "QAT: device restart failed. Device is unusable\n");
136 		return;
137 	}
138 
139 	sriov_data.accel_dev = accel_dev;
140 	init_completion(&sriov_data.compl);
141 	INIT_WORK(&sriov_data.sriov_work, adf_device_sriov_worker);
142 	queue_work(device_sriov_wq, &sriov_data.sriov_work);
143 	if (wait_for_completion_timeout(&sriov_data.compl, wait_jiffies))
144 		adf_pf2vf_notify_restarted(accel_dev);
145 
146 	adf_dev_restarted_notify(accel_dev);
147 	clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
148 
149 	/* The dev is back alive. Notify the caller if in sync mode */
150 	if (reset_data->mode == ADF_DEV_RESET_ASYNC)
151 		kfree(reset_data);
152 	else
153 		complete(&reset_data->compl);
154 }
155 
adf_dev_aer_schedule_reset(struct adf_accel_dev * accel_dev,enum adf_dev_reset_mode mode)156 static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
157 				      enum adf_dev_reset_mode mode)
158 {
159 	struct adf_reset_dev_data *reset_data;
160 
161 	if (!adf_dev_started(accel_dev) ||
162 	    test_bit(ADF_STATUS_RESTARTING, &accel_dev->status))
163 		return 0;
164 
165 	set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
166 	reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
167 	if (!reset_data)
168 		return -ENOMEM;
169 	reset_data->accel_dev = accel_dev;
170 	init_completion(&reset_data->compl);
171 	reset_data->mode = mode;
172 	INIT_WORK(&reset_data->reset_work, adf_device_reset_worker);
173 	queue_work(device_reset_wq, &reset_data->reset_work);
174 
175 	/* If in sync mode wait for the result */
176 	if (mode == ADF_DEV_RESET_SYNC) {
177 		int ret = 0;
178 		/* Maximum device reset time is 10 seconds */
179 		unsigned long wait_jiffies = msecs_to_jiffies(10000);
180 		unsigned long timeout = wait_for_completion_timeout(
181 				   &reset_data->compl, wait_jiffies);
182 		if (!timeout) {
183 			dev_err(&GET_DEV(accel_dev),
184 				"Reset device timeout expired\n");
185 			cancel_work_sync(&reset_data->reset_work);
186 			ret = -EFAULT;
187 		}
188 		kfree(reset_data);
189 		return ret;
190 	}
191 	return 0;
192 }
193 
adf_slot_reset(struct pci_dev * pdev)194 static pci_ers_result_t adf_slot_reset(struct pci_dev *pdev)
195 {
196 	struct adf_accel_dev *accel_dev = adf_devmgr_pci_to_accel_dev(pdev);
197 	int res = 0;
198 
199 	if (!accel_dev) {
200 		pr_err("QAT: Can't find acceleration device\n");
201 		return PCI_ERS_RESULT_DISCONNECT;
202 	}
203 
204 	if (!pdev->is_busmaster)
205 		pci_set_master(pdev);
206 	pci_restore_state(pdev);
207 	pci_save_state(pdev);
208 	res = adf_dev_up(accel_dev, false);
209 	if (res && res != -EALREADY)
210 		return PCI_ERS_RESULT_DISCONNECT;
211 
212 	adf_reenable_sriov(accel_dev);
213 	adf_pf2vf_notify_restarted(accel_dev);
214 	adf_dev_restarted_notify(accel_dev);
215 	clear_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
216 	return PCI_ERS_RESULT_RECOVERED;
217 }
218 
adf_resume(struct pci_dev * pdev)219 static void adf_resume(struct pci_dev *pdev)
220 {
221 	dev_info(&pdev->dev, "Acceleration driver reset completed\n");
222 	dev_info(&pdev->dev, "Device is up and running\n");
223 }
224 
225 const struct pci_error_handlers adf_err_handler = {
226 	.error_detected = adf_error_detected,
227 	.slot_reset = adf_slot_reset,
228 	.resume = adf_resume,
229 };
230 EXPORT_SYMBOL_GPL(adf_err_handler);
231 
adf_dev_autoreset(struct adf_accel_dev * accel_dev)232 int adf_dev_autoreset(struct adf_accel_dev *accel_dev)
233 {
234 	if (accel_dev->autoreset_on_error)
235 		return adf_dev_aer_schedule_reset(accel_dev, ADF_DEV_RESET_ASYNC);
236 
237 	return 0;
238 }
239 
adf_notify_fatal_error_worker(struct work_struct * work)240 static void adf_notify_fatal_error_worker(struct work_struct *work)
241 {
242 	struct adf_fatal_error_data *wq_data =
243 			container_of(work, struct adf_fatal_error_data, work);
244 	struct adf_accel_dev *accel_dev = wq_data->accel_dev;
245 	struct adf_hw_device_data *hw_device = accel_dev->hw_device;
246 
247 	adf_error_notifier(accel_dev);
248 
249 	if (!accel_dev->is_vf) {
250 		/* Disable arbitration to stop processing of new requests */
251 		if (accel_dev->autoreset_on_error && hw_device->exit_arb)
252 			hw_device->exit_arb(accel_dev);
253 		if (accel_dev->pf.vf_info)
254 			adf_pf2vf_notify_fatal_error(accel_dev);
255 		adf_dev_autoreset(accel_dev);
256 	}
257 
258 	kfree(wq_data);
259 }
260 
adf_notify_fatal_error(struct adf_accel_dev * accel_dev)261 int adf_notify_fatal_error(struct adf_accel_dev *accel_dev)
262 {
263 	struct adf_fatal_error_data *wq_data;
264 
265 	wq_data = kzalloc(sizeof(*wq_data), GFP_ATOMIC);
266 	if (!wq_data)
267 		return -ENOMEM;
268 
269 	wq_data->accel_dev = accel_dev;
270 	INIT_WORK(&wq_data->work, adf_notify_fatal_error_worker);
271 	adf_misc_wq_queue_work(&wq_data->work);
272 
273 	return 0;
274 }
275 
adf_init_aer(void)276 int adf_init_aer(void)
277 {
278 	device_reset_wq = alloc_workqueue("qat_device_reset_wq",
279 					  WQ_MEM_RECLAIM, 0);
280 	if (!device_reset_wq)
281 		return -EFAULT;
282 
283 	device_sriov_wq = alloc_workqueue("qat_device_sriov_wq", 0, 0);
284 	if (!device_sriov_wq) {
285 		destroy_workqueue(device_reset_wq);
286 		device_reset_wq = NULL;
287 		return -EFAULT;
288 	}
289 
290 	return 0;
291 }
292 
adf_exit_aer(void)293 void adf_exit_aer(void)
294 {
295 	if (device_reset_wq)
296 		destroy_workqueue(device_reset_wq);
297 	device_reset_wq = NULL;
298 
299 	if (device_sriov_wq)
300 		destroy_workqueue(device_sriov_wq);
301 	device_sriov_wq = NULL;
302 }
303