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