1/*
2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/workqueue.h>
35#include <linux/module.h>
36
37#include "mlx4.h"
38
39enum {
40 MLX4_CATAS_POLL_INTERVAL = 5 * HZ,
41};
42
43
44
45int mlx4_internal_err_reset = 1;
46module_param_named(internal_err_reset, mlx4_internal_err_reset, int, 0644);
47MODULE_PARM_DESC(internal_err_reset,
48 "Reset device on internal errors if non-zero (default 1)");
49
50static int read_vendor_id(struct mlx4_dev *dev)
51{
52 u16 vendor_id = 0;
53 int ret;
54
55 ret = pci_read_config_word(dev: dev->persist->pdev, where: 0, val: &vendor_id);
56 if (ret) {
57 mlx4_err(dev, "Failed to read vendor ID, ret=%d\n", ret);
58 return ret;
59 }
60
61 if (vendor_id == 0xffff) {
62 mlx4_err(dev, "PCI can't be accessed to read vendor id\n");
63 return -EINVAL;
64 }
65
66 return 0;
67}
68
69static int mlx4_reset_master(struct mlx4_dev *dev)
70{
71 int err = 0;
72
73 if (mlx4_is_master(dev))
74 mlx4_report_internal_err_comm_event(dev);
75
76 if (!pci_channel_offline(pdev: dev->persist->pdev)) {
77 err = read_vendor_id(dev);
78 /* If PCI can't be accessed to read vendor ID we assume that its
79 * link was disabled and chip was already reset.
80 */
81 if (err)
82 return 0;
83
84 err = mlx4_reset(dev);
85 if (err)
86 mlx4_err(dev, "Fail to reset HCA\n");
87 }
88
89 return err;
90}
91
92static int mlx4_reset_slave(struct mlx4_dev *dev)
93{
94#define COM_CHAN_RST_REQ_OFFSET 0x10
95#define COM_CHAN_RST_ACK_OFFSET 0x08
96
97 u32 comm_flags;
98 u32 rst_req;
99 u32 rst_ack;
100 unsigned long end;
101 struct mlx4_priv *priv = mlx4_priv(dev);
102
103 if (pci_channel_offline(pdev: dev->persist->pdev))
104 return 0;
105
106 comm_flags = swab32(readl((__iomem char *)priv->mfunc.comm +
107 MLX4_COMM_CHAN_FLAGS));
108 if (comm_flags == 0xffffffff) {
109 mlx4_err(dev, "VF reset is not needed\n");
110 return 0;
111 }
112
113 if (!(dev->caps.vf_caps & MLX4_VF_CAP_FLAG_RESET)) {
114 mlx4_err(dev, "VF reset is not supported\n");
115 return -EOPNOTSUPP;
116 }
117
118 rst_req = (comm_flags & (u32)(1 << COM_CHAN_RST_REQ_OFFSET)) >>
119 COM_CHAN_RST_REQ_OFFSET;
120 rst_ack = (comm_flags & (u32)(1 << COM_CHAN_RST_ACK_OFFSET)) >>
121 COM_CHAN_RST_ACK_OFFSET;
122 if (rst_req != rst_ack) {
123 mlx4_err(dev, "Communication channel isn't sync, fail to send reset\n");
124 return -EIO;
125 }
126
127 rst_req ^= 1;
128 mlx4_warn(dev, "VF is sending reset request to Firmware\n");
129 comm_flags = rst_req << COM_CHAN_RST_REQ_OFFSET;
130 __raw_writel(val: (__force u32)cpu_to_be32(comm_flags),
131 addr: (__iomem char *)priv->mfunc.comm + MLX4_COMM_CHAN_FLAGS);
132
133 end = msecs_to_jiffies(MLX4_COMM_TIME) + jiffies;
134 while (time_before(jiffies, end)) {
135 comm_flags = swab32(readl((__iomem char *)priv->mfunc.comm +
136 MLX4_COMM_CHAN_FLAGS));
137 rst_ack = (comm_flags & (u32)(1 << COM_CHAN_RST_ACK_OFFSET)) >>
138 COM_CHAN_RST_ACK_OFFSET;
139
140 /* Reading rst_req again since the communication channel can
141 * be reset at any time by the PF and all its bits will be
142 * set to zero.
143 */
144 rst_req = (comm_flags & (u32)(1 << COM_CHAN_RST_REQ_OFFSET)) >>
145 COM_CHAN_RST_REQ_OFFSET;
146
147 if (rst_ack == rst_req) {
148 mlx4_warn(dev, "VF Reset succeed\n");
149 return 0;
150 }
151 cond_resched();
152 }
153 mlx4_err(dev, "Fail to send reset over the communication channel\n");
154 return -ETIMEDOUT;
155}
156
157int mlx4_comm_internal_err(u32 slave_read)
158{
159 return (u32)COMM_CHAN_EVENT_INTERNAL_ERR ==
160 (slave_read & (u32)COMM_CHAN_EVENT_INTERNAL_ERR) ? 1 : 0;
161}
162
163void mlx4_enter_error_state(struct mlx4_dev_persistent *persist)
164{
165 int err;
166 struct mlx4_dev *dev;
167
168 if (!mlx4_internal_err_reset)
169 return;
170
171 mutex_lock(&persist->device_state_mutex);
172 if (persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR)
173 goto out;
174
175 dev = persist->dev;
176 mlx4_err(dev, "device is going to be reset\n");
177 if (mlx4_is_slave(dev)) {
178 err = mlx4_reset_slave(dev);
179 } else {
180 mlx4_crdump_collect(dev);
181 err = mlx4_reset_master(dev);
182 }
183
184 if (!err) {
185 mlx4_err(dev, "device was reset successfully\n");
186 } else {
187 /* EEH could have disabled the PCI channel during reset. That's
188 * recoverable and the PCI error flow will handle it.
189 */
190 if (!pci_channel_offline(pdev: dev->persist->pdev))
191 BUG_ON(1);
192 }
193 dev->persist->state |= MLX4_DEVICE_STATE_INTERNAL_ERROR;
194 mutex_unlock(lock: &persist->device_state_mutex);
195
196 /* At that step HW was already reset, now notify clients */
197 mlx4_dispatch_event(dev, type: MLX4_DEV_EVENT_CATASTROPHIC_ERROR, NULL);
198 mlx4_cmd_wake_completions(dev);
199 return;
200
201out:
202 mutex_unlock(lock: &persist->device_state_mutex);
203}
204
205static void mlx4_handle_error_state(struct mlx4_dev_persistent *persist)
206{
207 struct mlx4_dev *dev = persist->dev;
208 struct devlink *devlink;
209 int err = 0;
210
211 mlx4_enter_error_state(persist);
212 devlink = priv_to_devlink(priv: mlx4_priv(dev));
213 devl_lock(devlink);
214 mutex_lock(&persist->interface_state_mutex);
215 if (persist->interface_state & MLX4_INTERFACE_STATE_UP &&
216 !(persist->interface_state & MLX4_INTERFACE_STATE_DELETION)) {
217 err = mlx4_restart_one(pdev: persist->pdev);
218 mlx4_info(persist->dev, "mlx4_restart_one was ended, ret=%d\n",
219 err);
220 }
221 mutex_unlock(lock: &persist->interface_state_mutex);
222 devl_unlock(devlink);
223}
224
225static void dump_err_buf(struct mlx4_dev *dev)
226{
227 struct mlx4_priv *priv = mlx4_priv(dev);
228
229 int i;
230
231 mlx4_err(dev, "Internal error detected:\n");
232 for (i = 0; i < priv->fw.catas_size; ++i)
233 mlx4_err(dev, " buf[%02x]: %08x\n",
234 i, swab32(readl(priv->catas_err.map + i)));
235}
236
237static void poll_catas(struct timer_list *t)
238{
239 struct mlx4_priv *priv = from_timer(priv, t, catas_err.timer);
240 struct mlx4_dev *dev = &priv->dev;
241 u32 slave_read;
242
243 if (mlx4_is_slave(dev)) {
244 slave_read = swab32(readl(&priv->mfunc.comm->slave_read));
245 if (mlx4_comm_internal_err(slave_read)) {
246 mlx4_warn(dev, "Internal error detected on the communication channel\n");
247 goto internal_err;
248 }
249 } else if (readl(addr: priv->catas_err.map)) {
250 dump_err_buf(dev);
251 goto internal_err;
252 }
253
254 if (dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
255 mlx4_warn(dev, "Internal error mark was detected on device\n");
256 goto internal_err;
257 }
258
259 mod_timer(timer: &priv->catas_err.timer,
260 expires: round_jiffies(j: jiffies + MLX4_CATAS_POLL_INTERVAL));
261 return;
262
263internal_err:
264 if (mlx4_internal_err_reset)
265 queue_work(wq: dev->persist->catas_wq, work: &dev->persist->catas_work);
266}
267
268static void catas_reset(struct work_struct *work)
269{
270 struct mlx4_dev_persistent *persist =
271 container_of(work, struct mlx4_dev_persistent,
272 catas_work);
273
274 mlx4_handle_error_state(persist);
275}
276
277void mlx4_start_catas_poll(struct mlx4_dev *dev)
278{
279 struct mlx4_priv *priv = mlx4_priv(dev);
280 phys_addr_t addr;
281
282 INIT_LIST_HEAD(list: &priv->catas_err.list);
283 timer_setup(&priv->catas_err.timer, poll_catas, 0);
284 priv->catas_err.map = NULL;
285
286 if (!mlx4_is_slave(dev)) {
287 addr = pci_resource_start(dev->persist->pdev,
288 priv->fw.catas_bar) +
289 priv->fw.catas_offset;
290
291 priv->catas_err.map = ioremap(offset: addr, size: priv->fw.catas_size * 4);
292 if (!priv->catas_err.map) {
293 mlx4_warn(dev, "Failed to map internal error buffer at 0x%llx\n",
294 (unsigned long long)addr);
295 return;
296 }
297 }
298
299 priv->catas_err.timer.expires =
300 round_jiffies(j: jiffies + MLX4_CATAS_POLL_INTERVAL);
301 add_timer(timer: &priv->catas_err.timer);
302}
303
304void mlx4_stop_catas_poll(struct mlx4_dev *dev)
305{
306 struct mlx4_priv *priv = mlx4_priv(dev);
307
308 del_timer_sync(timer: &priv->catas_err.timer);
309
310 if (priv->catas_err.map) {
311 iounmap(addr: priv->catas_err.map);
312 priv->catas_err.map = NULL;
313 }
314
315 if (dev->persist->interface_state & MLX4_INTERFACE_STATE_DELETION)
316 flush_workqueue(dev->persist->catas_wq);
317}
318
319int mlx4_catas_init(struct mlx4_dev *dev)
320{
321 INIT_WORK(&dev->persist->catas_work, catas_reset);
322 dev->persist->catas_wq = create_singlethread_workqueue("mlx4_health");
323 if (!dev->persist->catas_wq)
324 return -ENOMEM;
325
326 return 0;
327}
328
329void mlx4_catas_end(struct mlx4_dev *dev)
330{
331 if (dev->persist->catas_wq) {
332 destroy_workqueue(wq: dev->persist->catas_wq);
333 dev->persist->catas_wq = NULL;
334 }
335}
336

source code of linux/drivers/net/ethernet/mellanox/mlx4/catas.c