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1/*
2 *
3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2012, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 */
16
17#include <linux/export.h>
18#include <linux/sched.h>
19#include <linux/wait.h>
20#include <linux/delay.h>
21
22#include <linux/mei.h>
23
24#include "mei_dev.h"
25#include "hbm.h"
26#include "client.h"
27
28const char *mei_dev_state_str(int state)
29{
30#define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
31 switch (state) {
32 MEI_DEV_STATE(INITIALIZING);
33 MEI_DEV_STATE(INIT_CLIENTS);
34 MEI_DEV_STATE(ENABLED);
35 MEI_DEV_STATE(RESETTING);
36 MEI_DEV_STATE(DISABLED);
37 MEI_DEV_STATE(POWER_DOWN);
38 MEI_DEV_STATE(POWER_UP);
39 default:
40 return "unknown";
41 }
42#undef MEI_DEV_STATE
43}
44
45const char *mei_pg_state_str(enum mei_pg_state state)
46{
47#define MEI_PG_STATE(state) case MEI_PG_##state: return #state
48 switch (state) {
49 MEI_PG_STATE(OFF);
50 MEI_PG_STATE(ON);
51 default:
52 return "unknown";
53 }
54#undef MEI_PG_STATE
55}
56
57/**
58 * mei_fw_status2str - convert fw status registers to printable string
59 *
60 * @fw_status: firmware status
61 * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
62 * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
63 *
64 * Return: number of bytes written or -EINVAL if buffer is to small
65 */
66ssize_t mei_fw_status2str(struct mei_fw_status *fw_status,
67 char *buf, size_t len)
68{
69 ssize_t cnt = 0;
70 int i;
71
72 buf[0] = '\0';
73
74 if (len < MEI_FW_STATUS_STR_SZ)
75 return -EINVAL;
76
77 for (i = 0; i < fw_status->count; i++)
78 cnt += scnprintf(buf + cnt, len - cnt, "%08X ",
79 fw_status->status[i]);
80
81 /* drop last space */
82 buf[cnt] = '\0';
83 return cnt;
84}
85EXPORT_SYMBOL_GPL(mei_fw_status2str);
86
87/**
88 * mei_cancel_work - Cancel mei background jobs
89 *
90 * @dev: the device structure
91 */
92void mei_cancel_work(struct mei_device *dev)
93{
94 cancel_work_sync(&dev->reset_work);
95 cancel_work_sync(&dev->bus_rescan_work);
96
97 cancel_delayed_work(&dev->timer_work);
98}
99EXPORT_SYMBOL_GPL(mei_cancel_work);
100
101/**
102 * mei_reset - resets host and fw.
103 *
104 * @dev: the device structure
105 *
106 * Return: 0 on success or < 0 if the reset hasn't succeeded
107 */
108int mei_reset(struct mei_device *dev)
109{
110 enum mei_dev_state state = dev->dev_state;
111 bool interrupts_enabled;
112 int ret;
113
114 if (state != MEI_DEV_INITIALIZING &&
115 state != MEI_DEV_DISABLED &&
116 state != MEI_DEV_POWER_DOWN &&
117 state != MEI_DEV_POWER_UP) {
118 char fw_sts_str[MEI_FW_STATUS_STR_SZ];
119
120 mei_fw_status_str(dev, fw_sts_str, MEI_FW_STATUS_STR_SZ);
121 dev_warn(dev->dev, "unexpected reset: dev_state = %s fw status = %s\n",
122 mei_dev_state_str(state), fw_sts_str);
123 }
124
125 /* we're already in reset, cancel the init timer
126 * if the reset was called due the hbm protocol error
127 * we need to call it before hw start
128 * so the hbm watchdog won't kick in
129 */
130 mei_hbm_idle(dev);
131
132 /* enter reset flow */
133 interrupts_enabled = state != MEI_DEV_POWER_DOWN;
134 dev->dev_state = MEI_DEV_RESETTING;
135
136 dev->reset_count++;
137 if (dev->reset_count > MEI_MAX_CONSEC_RESET) {
138 dev_err(dev->dev, "reset: reached maximal consecutive resets: disabling the device\n");
139 dev->dev_state = MEI_DEV_DISABLED;
140 return -ENODEV;
141 }
142
143 ret = mei_hw_reset(dev, interrupts_enabled);
144 /* fall through and remove the sw state even if hw reset has failed */
145
146 /* no need to clean up software state in case of power up */
147 if (state != MEI_DEV_INITIALIZING &&
148 state != MEI_DEV_POWER_UP) {
149
150 /* remove all waiting requests */
151 mei_cl_all_disconnect(dev);
152
153 /* remove entry if already in list */
154 dev_dbg(dev->dev, "remove iamthif from the file list.\n");
155 mei_cl_unlink(&dev->iamthif_cl);
156 mei_amthif_reset_params(dev);
157 }
158
159 mei_hbm_reset(dev);
160
161 dev->rd_msg_hdr = 0;
162
163 if (ret) {
164 dev_err(dev->dev, "hw_reset failed ret = %d\n", ret);
165 return ret;
166 }
167
168 if (state == MEI_DEV_POWER_DOWN) {
169 dev_dbg(dev->dev, "powering down: end of reset\n");
170 dev->dev_state = MEI_DEV_DISABLED;
171 return 0;
172 }
173
174 ret = mei_hw_start(dev);
175 if (ret) {
176 dev_err(dev->dev, "hw_start failed ret = %d\n", ret);
177 return ret;
178 }
179
180 dev_dbg(dev->dev, "link is established start sending messages.\n");
181
182 dev->dev_state = MEI_DEV_INIT_CLIENTS;
183 ret = mei_hbm_start_req(dev);
184 if (ret) {
185 dev_err(dev->dev, "hbm_start failed ret = %d\n", ret);
186 dev->dev_state = MEI_DEV_RESETTING;
187 return ret;
188 }
189
190 return 0;
191}
192EXPORT_SYMBOL_GPL(mei_reset);
193
194/**
195 * mei_start - initializes host and fw to start work.
196 *
197 * @dev: the device structure
198 *
199 * Return: 0 on success, <0 on failure.
200 */
201int mei_start(struct mei_device *dev)
202{
203 int ret;
204
205 mutex_lock(&dev->device_lock);
206
207 /* acknowledge interrupt and stop interrupts */
208 mei_clear_interrupts(dev);
209
210 mei_hw_config(dev);
211
212 dev_dbg(dev->dev, "reset in start the mei device.\n");
213
214 dev->reset_count = 0;
215 do {
216 dev->dev_state = MEI_DEV_INITIALIZING;
217 ret = mei_reset(dev);
218
219 if (ret == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
220 dev_err(dev->dev, "reset failed ret = %d", ret);
221 goto err;
222 }
223 } while (ret);
224
225 /* we cannot start the device w/o hbm start message completed */
226 if (dev->dev_state == MEI_DEV_DISABLED) {
227 dev_err(dev->dev, "reset failed");
228 goto err;
229 }
230
231 if (mei_hbm_start_wait(dev)) {
232 dev_err(dev->dev, "HBM haven't started");
233 goto err;
234 }
235
236 if (!mei_host_is_ready(dev)) {
237 dev_err(dev->dev, "host is not ready.\n");
238 goto err;
239 }
240
241 if (!mei_hw_is_ready(dev)) {
242 dev_err(dev->dev, "ME is not ready.\n");
243 goto err;
244 }
245
246 if (!mei_hbm_version_is_supported(dev)) {
247 dev_dbg(dev->dev, "MEI start failed.\n");
248 goto err;
249 }
250
251 dev_dbg(dev->dev, "link layer has been established.\n");
252
253 mutex_unlock(&dev->device_lock);
254 return 0;
255err:
256 dev_err(dev->dev, "link layer initialization failed.\n");
257 dev->dev_state = MEI_DEV_DISABLED;
258 mutex_unlock(&dev->device_lock);
259 return -ENODEV;
260}
261EXPORT_SYMBOL_GPL(mei_start);
262
263/**
264 * mei_restart - restart device after suspend
265 *
266 * @dev: the device structure
267 *
268 * Return: 0 on success or -ENODEV if the restart hasn't succeeded
269 */
270int mei_restart(struct mei_device *dev)
271{
272 int err;
273
274 mutex_lock(&dev->device_lock);
275
276 mei_clear_interrupts(dev);
277
278 dev->dev_state = MEI_DEV_POWER_UP;
279 dev->reset_count = 0;
280
281 err = mei_reset(dev);
282
283 mutex_unlock(&dev->device_lock);
284
285 if (err == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
286 dev_err(dev->dev, "device disabled = %d\n", err);
287 return -ENODEV;
288 }
289
290 /* try to start again */
291 if (err)
292 schedule_work(&dev->reset_work);
293
294
295 return 0;
296}
297EXPORT_SYMBOL_GPL(mei_restart);
298
299static void mei_reset_work(struct work_struct *work)
300{
301 struct mei_device *dev =
302 container_of(work, struct mei_device, reset_work);
303 int ret;
304
305 mutex_lock(&dev->device_lock);
306
307 ret = mei_reset(dev);
308
309 mutex_unlock(&dev->device_lock);
310
311 if (dev->dev_state == MEI_DEV_DISABLED) {
312 dev_err(dev->dev, "device disabled = %d\n", ret);
313 return;
314 }
315
316 /* retry reset in case of failure */
317 if (ret)
318 schedule_work(&dev->reset_work);
319}
320
321void mei_stop(struct mei_device *dev)
322{
323 dev_dbg(dev->dev, "stopping the device.\n");
324
325 mei_cl_bus_remove_devices(dev);
326
327 mei_cancel_work(dev);
328
329 mutex_lock(&dev->device_lock);
330
331 dev->dev_state = MEI_DEV_POWER_DOWN;
332 mei_reset(dev);
333 /* move device to disabled state unconditionally */
334 dev->dev_state = MEI_DEV_DISABLED;
335
336 mutex_unlock(&dev->device_lock);
337}
338EXPORT_SYMBOL_GPL(mei_stop);
339
340/**
341 * mei_write_is_idle - check if the write queues are idle
342 *
343 * @dev: the device structure
344 *
345 * Return: true of there is no pending write
346 */
347bool mei_write_is_idle(struct mei_device *dev)
348{
349 bool idle = (dev->dev_state == MEI_DEV_ENABLED &&
350 list_empty(&dev->ctrl_wr_list.list) &&
351 list_empty(&dev->write_list.list) &&
352 list_empty(&dev->write_waiting_list.list));
353
354 dev_dbg(dev->dev, "write pg: is idle[%d] state=%s ctrl=%01d write=%01d wwait=%01d\n",
355 idle,
356 mei_dev_state_str(dev->dev_state),
357 list_empty(&dev->ctrl_wr_list.list),
358 list_empty(&dev->write_list.list),
359 list_empty(&dev->write_waiting_list.list));
360
361 return idle;
362}
363EXPORT_SYMBOL_GPL(mei_write_is_idle);
364
365/**
366 * mei_device_init -- initialize mei_device structure
367 *
368 * @dev: the mei device
369 * @device: the device structure
370 * @hw_ops: hw operations
371 */
372void mei_device_init(struct mei_device *dev,
373 struct device *device,
374 const struct mei_hw_ops *hw_ops)
375{
376 /* setup our list array */
377 INIT_LIST_HEAD(&dev->file_list);
378 INIT_LIST_HEAD(&dev->device_list);
379 INIT_LIST_HEAD(&dev->me_clients);
380 mutex_init(&dev->device_lock);
381 init_rwsem(&dev->me_clients_rwsem);
382 mutex_init(&dev->cl_bus_lock);
383 init_waitqueue_head(&dev->wait_hw_ready);
384 init_waitqueue_head(&dev->wait_pg);
385 init_waitqueue_head(&dev->wait_hbm_start);
386 dev->dev_state = MEI_DEV_INITIALIZING;
387 dev->reset_count = 0;
388
389 mei_io_list_init(&dev->write_list);
390 mei_io_list_init(&dev->write_waiting_list);
391 mei_io_list_init(&dev->ctrl_wr_list);
392 mei_io_list_init(&dev->ctrl_rd_list);
393
394 INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
395 INIT_WORK(&dev->reset_work, mei_reset_work);
396 INIT_WORK(&dev->bus_rescan_work, mei_cl_bus_rescan_work);
397
398 INIT_LIST_HEAD(&dev->iamthif_cl.link);
399 mei_io_list_init(&dev->amthif_cmd_list);
400
401 bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
402 dev->open_handle_count = 0;
403
404 /*
405 * Reserving the first client ID
406 * 0: Reserved for MEI Bus Message communications
407 */
408 bitmap_set(dev->host_clients_map, 0, 1);
409
410 dev->pg_event = MEI_PG_EVENT_IDLE;
411 dev->ops = hw_ops;
412 dev->dev = device;
413}
414EXPORT_SYMBOL_GPL(mei_device_init);
415
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2012-2022, Intel Corporation. All rights reserved.
4 * Intel Management Engine Interface (Intel MEI) Linux driver
5 */
6
7#include <linux/export.h>
8#include <linux/sched.h>
9#include <linux/wait.h>
10#include <linux/delay.h>
11
12#include <linux/mei.h>
13
14#include "mei_dev.h"
15#include "hbm.h"
16#include "client.h"
17
18const char *mei_dev_state_str(int state)
19{
20#define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
21 switch (state) {
22 MEI_DEV_STATE(INITIALIZING);
23 MEI_DEV_STATE(INIT_CLIENTS);
24 MEI_DEV_STATE(ENABLED);
25 MEI_DEV_STATE(RESETTING);
26 MEI_DEV_STATE(DISABLED);
27 MEI_DEV_STATE(POWERING_DOWN);
28 MEI_DEV_STATE(POWER_DOWN);
29 MEI_DEV_STATE(POWER_UP);
30 default:
31 return "unknown";
32 }
33#undef MEI_DEV_STATE
34}
35
36const char *mei_pg_state_str(enum mei_pg_state state)
37{
38#define MEI_PG_STATE(state) case MEI_PG_##state: return #state
39 switch (state) {
40 MEI_PG_STATE(OFF);
41 MEI_PG_STATE(ON);
42 default:
43 return "unknown";
44 }
45#undef MEI_PG_STATE
46}
47
48/**
49 * mei_fw_status2str - convert fw status registers to printable string
50 *
51 * @fw_status: firmware status
52 * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
53 * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
54 *
55 * Return: number of bytes written or -EINVAL if buffer is to small
56 */
57ssize_t mei_fw_status2str(struct mei_fw_status *fw_status,
58 char *buf, size_t len)
59{
60 ssize_t cnt = 0;
61 int i;
62
63 buf[0] = '\0';
64
65 if (len < MEI_FW_STATUS_STR_SZ)
66 return -EINVAL;
67
68 for (i = 0; i < fw_status->count; i++)
69 cnt += scnprintf(buf + cnt, len - cnt, "%08X ",
70 fw_status->status[i]);
71
72 /* drop last space */
73 buf[cnt] = '\0';
74 return cnt;
75}
76EXPORT_SYMBOL_GPL(mei_fw_status2str);
77
78/**
79 * mei_cancel_work - Cancel mei background jobs
80 *
81 * @dev: the device structure
82 */
83void mei_cancel_work(struct mei_device *dev)
84{
85 cancel_work_sync(&dev->reset_work);
86 cancel_work_sync(&dev->bus_rescan_work);
87
88 cancel_delayed_work_sync(&dev->timer_work);
89}
90EXPORT_SYMBOL_GPL(mei_cancel_work);
91
92/**
93 * mei_reset - resets host and fw.
94 *
95 * @dev: the device structure
96 *
97 * Return: 0 on success or < 0 if the reset hasn't succeeded
98 */
99int mei_reset(struct mei_device *dev)
100{
101 enum mei_dev_state state = dev->dev_state;
102 bool interrupts_enabled;
103 int ret;
104
105 if (state != MEI_DEV_INITIALIZING &&
106 state != MEI_DEV_DISABLED &&
107 state != MEI_DEV_POWER_DOWN &&
108 state != MEI_DEV_POWER_UP) {
109 char fw_sts_str[MEI_FW_STATUS_STR_SZ];
110
111 mei_fw_status_str(dev, fw_sts_str, MEI_FW_STATUS_STR_SZ);
112 dev_warn(dev->dev, "unexpected reset: dev_state = %s fw status = %s\n",
113 mei_dev_state_str(state), fw_sts_str);
114 }
115
116 mei_clear_interrupts(dev);
117
118 /* we're already in reset, cancel the init timer
119 * if the reset was called due the hbm protocol error
120 * we need to call it before hw start
121 * so the hbm watchdog won't kick in
122 */
123 mei_hbm_idle(dev);
124
125 /* enter reset flow */
126 interrupts_enabled = state != MEI_DEV_POWER_DOWN;
127 mei_set_devstate(dev, MEI_DEV_RESETTING);
128
129 dev->reset_count++;
130 if (dev->reset_count > MEI_MAX_CONSEC_RESET) {
131 dev_err(dev->dev, "reset: reached maximal consecutive resets: disabling the device\n");
132 mei_set_devstate(dev, MEI_DEV_DISABLED);
133 return -ENODEV;
134 }
135
136 ret = mei_hw_reset(dev, interrupts_enabled);
137 /* fall through and remove the sw state even if hw reset has failed */
138
139 /* no need to clean up software state in case of power up */
140 if (state != MEI_DEV_INITIALIZING && state != MEI_DEV_POWER_UP)
141 mei_cl_all_disconnect(dev);
142
143 mei_hbm_reset(dev);
144
145 memset(dev->rd_msg_hdr, 0, sizeof(dev->rd_msg_hdr));
146
147 if (ret) {
148 dev_err(dev->dev, "hw_reset failed ret = %d\n", ret);
149 return ret;
150 }
151
152 if (state == MEI_DEV_POWER_DOWN) {
153 dev_dbg(dev->dev, "powering down: end of reset\n");
154 mei_set_devstate(dev, MEI_DEV_DISABLED);
155 return 0;
156 }
157
158 ret = mei_hw_start(dev);
159 if (ret) {
160 dev_err(dev->dev, "hw_start failed ret = %d\n", ret);
161 return ret;
162 }
163
164 if (dev->dev_state != MEI_DEV_RESETTING) {
165 dev_dbg(dev->dev, "wrong state = %d on link start\n", dev->dev_state);
166 return 0;
167 }
168
169 dev_dbg(dev->dev, "link is established start sending messages.\n");
170
171 mei_set_devstate(dev, MEI_DEV_INIT_CLIENTS);
172 ret = mei_hbm_start_req(dev);
173 if (ret) {
174 dev_err(dev->dev, "hbm_start failed ret = %d\n", ret);
175 mei_set_devstate(dev, MEI_DEV_RESETTING);
176 return ret;
177 }
178
179 return 0;
180}
181EXPORT_SYMBOL_GPL(mei_reset);
182
183/**
184 * mei_start - initializes host and fw to start work.
185 *
186 * @dev: the device structure
187 *
188 * Return: 0 on success, <0 on failure.
189 */
190int mei_start(struct mei_device *dev)
191{
192 int ret;
193
194 mutex_lock(&dev->device_lock);
195
196 /* acknowledge interrupt and stop interrupts */
197 mei_clear_interrupts(dev);
198
199 ret = mei_hw_config(dev);
200 if (ret)
201 goto err;
202
203 dev_dbg(dev->dev, "reset in start the mei device.\n");
204
205 dev->reset_count = 0;
206 do {
207 mei_set_devstate(dev, MEI_DEV_INITIALIZING);
208 ret = mei_reset(dev);
209
210 if (ret == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
211 dev_err(dev->dev, "reset failed ret = %d", ret);
212 goto err;
213 }
214 } while (ret);
215
216 if (mei_hbm_start_wait(dev)) {
217 dev_err(dev->dev, "HBM haven't started");
218 goto err;
219 }
220
221 if (!mei_hbm_version_is_supported(dev)) {
222 dev_dbg(dev->dev, "MEI start failed.\n");
223 goto err;
224 }
225
226 dev_dbg(dev->dev, "link layer has been established.\n");
227
228 mutex_unlock(&dev->device_lock);
229 return 0;
230err:
231 dev_err(dev->dev, "link layer initialization failed.\n");
232 mei_set_devstate(dev, MEI_DEV_DISABLED);
233 mutex_unlock(&dev->device_lock);
234 return -ENODEV;
235}
236EXPORT_SYMBOL_GPL(mei_start);
237
238/**
239 * mei_restart - restart device after suspend
240 *
241 * @dev: the device structure
242 *
243 * Return: 0 on success or -ENODEV if the restart hasn't succeeded
244 */
245int mei_restart(struct mei_device *dev)
246{
247 int err;
248
249 mutex_lock(&dev->device_lock);
250
251 mei_set_devstate(dev, MEI_DEV_POWER_UP);
252 dev->reset_count = 0;
253
254 err = mei_reset(dev);
255
256 mutex_unlock(&dev->device_lock);
257
258 if (err == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
259 dev_err(dev->dev, "device disabled = %d\n", err);
260 return -ENODEV;
261 }
262
263 /* try to start again */
264 if (err)
265 schedule_work(&dev->reset_work);
266
267
268 return 0;
269}
270EXPORT_SYMBOL_GPL(mei_restart);
271
272static void mei_reset_work(struct work_struct *work)
273{
274 struct mei_device *dev =
275 container_of(work, struct mei_device, reset_work);
276 int ret;
277
278 mei_clear_interrupts(dev);
279 mei_synchronize_irq(dev);
280
281 mutex_lock(&dev->device_lock);
282
283 ret = mei_reset(dev);
284
285 mutex_unlock(&dev->device_lock);
286
287 if (dev->dev_state == MEI_DEV_DISABLED) {
288 dev_err(dev->dev, "device disabled = %d\n", ret);
289 return;
290 }
291
292 /* retry reset in case of failure */
293 if (ret)
294 schedule_work(&dev->reset_work);
295}
296
297void mei_stop(struct mei_device *dev)
298{
299 dev_dbg(dev->dev, "stopping the device.\n");
300
301 mutex_lock(&dev->device_lock);
302 mei_set_devstate(dev, MEI_DEV_POWERING_DOWN);
303 mutex_unlock(&dev->device_lock);
304 mei_cl_bus_remove_devices(dev);
305 mutex_lock(&dev->device_lock);
306 mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
307 mutex_unlock(&dev->device_lock);
308
309 mei_cancel_work(dev);
310
311 mei_clear_interrupts(dev);
312 mei_synchronize_irq(dev);
313 /* to catch HW-initiated reset */
314 mei_cancel_work(dev);
315
316 mutex_lock(&dev->device_lock);
317
318 mei_reset(dev);
319 /* move device to disabled state unconditionally */
320 mei_set_devstate(dev, MEI_DEV_DISABLED);
321
322 mutex_unlock(&dev->device_lock);
323}
324EXPORT_SYMBOL_GPL(mei_stop);
325
326/**
327 * mei_write_is_idle - check if the write queues are idle
328 *
329 * @dev: the device structure
330 *
331 * Return: true of there is no pending write
332 */
333bool mei_write_is_idle(struct mei_device *dev)
334{
335 bool idle = (dev->dev_state == MEI_DEV_ENABLED &&
336 list_empty(&dev->ctrl_wr_list) &&
337 list_empty(&dev->write_list) &&
338 list_empty(&dev->write_waiting_list));
339
340 dev_dbg(dev->dev, "write pg: is idle[%d] state=%s ctrl=%01d write=%01d wwait=%01d\n",
341 idle,
342 mei_dev_state_str(dev->dev_state),
343 list_empty(&dev->ctrl_wr_list),
344 list_empty(&dev->write_list),
345 list_empty(&dev->write_waiting_list));
346
347 return idle;
348}
349EXPORT_SYMBOL_GPL(mei_write_is_idle);
350
351/**
352 * mei_device_init - initialize mei_device structure
353 *
354 * @dev: the mei device
355 * @device: the device structure
356 * @slow_fw: configure longer timeouts as FW is slow
357 * @hw_ops: hw operations
358 */
359void mei_device_init(struct mei_device *dev,
360 struct device *device,
361 bool slow_fw,
362 const struct mei_hw_ops *hw_ops)
363{
364 /* setup our list array */
365 INIT_LIST_HEAD(&dev->file_list);
366 INIT_LIST_HEAD(&dev->device_list);
367 INIT_LIST_HEAD(&dev->me_clients);
368 mutex_init(&dev->device_lock);
369 init_rwsem(&dev->me_clients_rwsem);
370 mutex_init(&dev->cl_bus_lock);
371 init_waitqueue_head(&dev->wait_hw_ready);
372 init_waitqueue_head(&dev->wait_pg);
373 init_waitqueue_head(&dev->wait_hbm_start);
374 dev->dev_state = MEI_DEV_INITIALIZING;
375 dev->reset_count = 0;
376
377 INIT_LIST_HEAD(&dev->write_list);
378 INIT_LIST_HEAD(&dev->write_waiting_list);
379 INIT_LIST_HEAD(&dev->ctrl_wr_list);
380 INIT_LIST_HEAD(&dev->ctrl_rd_list);
381 dev->tx_queue_limit = MEI_TX_QUEUE_LIMIT_DEFAULT;
382
383 INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
384 INIT_WORK(&dev->reset_work, mei_reset_work);
385 INIT_WORK(&dev->bus_rescan_work, mei_cl_bus_rescan_work);
386
387 bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
388 dev->open_handle_count = 0;
389
390 dev->pxp_mode = MEI_DEV_PXP_DEFAULT;
391
392 /*
393 * Reserving the first client ID
394 * 0: Reserved for MEI Bus Message communications
395 */
396 bitmap_set(dev->host_clients_map, 0, 1);
397
398 dev->pg_event = MEI_PG_EVENT_IDLE;
399 dev->ops = hw_ops;
400 dev->dev = device;
401
402 dev->timeouts.hw_ready = mei_secs_to_jiffies(MEI_HW_READY_TIMEOUT);
403 dev->timeouts.connect = MEI_CONNECT_TIMEOUT;
404 dev->timeouts.client_init = MEI_CLIENTS_INIT_TIMEOUT;
405 dev->timeouts.pgi = mei_secs_to_jiffies(MEI_PGI_TIMEOUT);
406 dev->timeouts.d0i3 = mei_secs_to_jiffies(MEI_D0I3_TIMEOUT);
407 if (slow_fw) {
408 dev->timeouts.cl_connect = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT_SLOW);
409 dev->timeouts.hbm = mei_secs_to_jiffies(MEI_HBM_TIMEOUT_SLOW);
410 dev->timeouts.mkhi_recv = msecs_to_jiffies(MKHI_RCV_TIMEOUT_SLOW);
411 } else {
412 dev->timeouts.cl_connect = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
413 dev->timeouts.hbm = mei_secs_to_jiffies(MEI_HBM_TIMEOUT);
414 dev->timeouts.mkhi_recv = msecs_to_jiffies(MKHI_RCV_TIMEOUT);
415 }
416}
417EXPORT_SYMBOL_GPL(mei_device_init);
418