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1fb82ee8 BA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (c) 2017, Linaro Ltd. | |
4 | */ | |
5 | #include <linux/firmware.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/notifier.h> | |
8 | #include <linux/slab.h> | |
027045a6 | 9 | #include <linux/interrupt.h> |
1fb82ee8 | 10 | #include <linux/io.h> |
027045a6 | 11 | #include <linux/of_irq.h> |
1fb82ee8 BA |
12 | #include <linux/of_platform.h> |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/remoteproc/qcom_rproc.h> | |
15 | #include <linux/rpmsg.h> | |
16 | ||
17 | #include "qcom_common.h" | |
18 | ||
19 | static BLOCKING_NOTIFIER_HEAD(sysmon_notifiers); | |
20 | ||
21 | struct qcom_sysmon { | |
22 | struct rproc_subdev subdev; | |
23 | struct rproc *rproc; | |
24 | ||
138a6428 BA |
25 | int state; |
26 | struct mutex state_lock; | |
27 | ||
1fb82ee8 BA |
28 | struct list_head node; |
29 | ||
30 | const char *name; | |
31 | ||
027045a6 | 32 | int shutdown_irq; |
1fb82ee8 BA |
33 | int ssctl_version; |
34 | int ssctl_instance; | |
35 | ||
36 | struct notifier_block nb; | |
37 | ||
38 | struct device *dev; | |
39 | ||
40 | struct rpmsg_endpoint *ept; | |
41 | struct completion comp; | |
74f27202 | 42 | struct completion ind_comp; |
027045a6 | 43 | struct completion shutdown_comp; |
1fb82ee8 BA |
44 | struct mutex lock; |
45 | ||
46 | bool ssr_ack; | |
5c212aaf | 47 | bool shutdown_acked; |
1fb82ee8 BA |
48 | |
49 | struct qmi_handle qmi; | |
50 | struct sockaddr_qrtr ssctl; | |
51 | }; | |
52 | ||
66a4347e SG |
53 | enum { |
54 | SSCTL_SSR_EVENT_BEFORE_POWERUP, | |
55 | SSCTL_SSR_EVENT_AFTER_POWERUP, | |
56 | SSCTL_SSR_EVENT_BEFORE_SHUTDOWN, | |
57 | SSCTL_SSR_EVENT_AFTER_SHUTDOWN, | |
58 | }; | |
59 | ||
60 | static const char * const sysmon_state_string[] = { | |
61 | [SSCTL_SSR_EVENT_BEFORE_POWERUP] = "before_powerup", | |
62 | [SSCTL_SSR_EVENT_AFTER_POWERUP] = "after_powerup", | |
63 | [SSCTL_SSR_EVENT_BEFORE_SHUTDOWN] = "before_shutdown", | |
64 | [SSCTL_SSR_EVENT_AFTER_SHUTDOWN] = "after_shutdown", | |
65 | }; | |
66 | ||
67 | struct sysmon_event { | |
68 | const char *subsys_name; | |
69 | u32 ssr_event; | |
70 | }; | |
71 | ||
1fb82ee8 BA |
72 | static DEFINE_MUTEX(sysmon_lock); |
73 | static LIST_HEAD(sysmon_list); | |
74 | ||
75 | /** | |
76 | * sysmon_send_event() - send notification of other remote's SSR event | |
77 | * @sysmon: sysmon context | |
5b435ca3 | 78 | * @event: sysmon event context |
1fb82ee8 | 79 | */ |
66a4347e SG |
80 | static void sysmon_send_event(struct qcom_sysmon *sysmon, |
81 | const struct sysmon_event *event) | |
1fb82ee8 BA |
82 | { |
83 | char req[50]; | |
84 | int len; | |
85 | int ret; | |
86 | ||
66a4347e SG |
87 | len = snprintf(req, sizeof(req), "ssr:%s:%s", event->subsys_name, |
88 | sysmon_state_string[event->ssr_event]); | |
1fb82ee8 BA |
89 | if (len >= sizeof(req)) |
90 | return; | |
91 | ||
92 | mutex_lock(&sysmon->lock); | |
93 | reinit_completion(&sysmon->comp); | |
94 | sysmon->ssr_ack = false; | |
95 | ||
96 | ret = rpmsg_send(sysmon->ept, req, len); | |
97 | if (ret < 0) { | |
98 | dev_err(sysmon->dev, "failed to send sysmon event\n"); | |
99 | goto out_unlock; | |
100 | } | |
101 | ||
102 | ret = wait_for_completion_timeout(&sysmon->comp, | |
103 | msecs_to_jiffies(5000)); | |
104 | if (!ret) { | |
105 | dev_err(sysmon->dev, "timeout waiting for sysmon ack\n"); | |
106 | goto out_unlock; | |
107 | } | |
108 | ||
109 | if (!sysmon->ssr_ack) | |
110 | dev_err(sysmon->dev, "unexpected response to sysmon event\n"); | |
111 | ||
112 | out_unlock: | |
113 | mutex_unlock(&sysmon->lock); | |
114 | } | |
115 | ||
116 | /** | |
117 | * sysmon_request_shutdown() - request graceful shutdown of remote | |
118 | * @sysmon: sysmon context | |
5c212aaf BA |
119 | * |
120 | * Return: boolean indicator of the remote processor acking the request | |
1fb82ee8 | 121 | */ |
5c212aaf | 122 | static bool sysmon_request_shutdown(struct qcom_sysmon *sysmon) |
1fb82ee8 BA |
123 | { |
124 | char *req = "ssr:shutdown"; | |
5c212aaf | 125 | bool acked = false; |
1fb82ee8 BA |
126 | int ret; |
127 | ||
128 | mutex_lock(&sysmon->lock); | |
129 | reinit_completion(&sysmon->comp); | |
130 | sysmon->ssr_ack = false; | |
131 | ||
132 | ret = rpmsg_send(sysmon->ept, req, strlen(req) + 1); | |
133 | if (ret < 0) { | |
134 | dev_err(sysmon->dev, "send sysmon shutdown request failed\n"); | |
135 | goto out_unlock; | |
136 | } | |
137 | ||
138 | ret = wait_for_completion_timeout(&sysmon->comp, | |
139 | msecs_to_jiffies(5000)); | |
140 | if (!ret) { | |
141 | dev_err(sysmon->dev, "timeout waiting for sysmon ack\n"); | |
142 | goto out_unlock; | |
143 | } | |
144 | ||
145 | if (!sysmon->ssr_ack) | |
146 | dev_err(sysmon->dev, | |
147 | "unexpected response to sysmon shutdown request\n"); | |
5c212aaf BA |
148 | else |
149 | acked = true; | |
1fb82ee8 BA |
150 | |
151 | out_unlock: | |
152 | mutex_unlock(&sysmon->lock); | |
5c212aaf BA |
153 | |
154 | return acked; | |
1fb82ee8 BA |
155 | } |
156 | ||
157 | static int sysmon_callback(struct rpmsg_device *rpdev, void *data, int count, | |
158 | void *priv, u32 addr) | |
159 | { | |
160 | struct qcom_sysmon *sysmon = priv; | |
161 | const char *ssr_ack = "ssr:ack"; | |
162 | const int ssr_ack_len = strlen(ssr_ack) + 1; | |
163 | ||
164 | if (!sysmon) | |
165 | return -EINVAL; | |
166 | ||
167 | if (count >= ssr_ack_len && !memcmp(data, ssr_ack, ssr_ack_len)) | |
168 | sysmon->ssr_ack = true; | |
169 | ||
170 | complete(&sysmon->comp); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | #define SSCTL_SHUTDOWN_REQ 0x21 | |
74f27202 | 176 | #define SSCTL_SHUTDOWN_READY_IND 0x21 |
1fb82ee8 BA |
177 | #define SSCTL_SUBSYS_EVENT_REQ 0x23 |
178 | ||
179 | #define SSCTL_MAX_MSG_LEN 7 | |
180 | ||
181 | #define SSCTL_SUBSYS_NAME_LENGTH 15 | |
182 | ||
1fb82ee8 BA |
183 | enum { |
184 | SSCTL_SSR_EVENT_FORCED, | |
185 | SSCTL_SSR_EVENT_GRACEFUL, | |
186 | }; | |
187 | ||
188 | struct ssctl_shutdown_resp { | |
189 | struct qmi_response_type_v01 resp; | |
190 | }; | |
191 | ||
192 | static struct qmi_elem_info ssctl_shutdown_resp_ei[] = { | |
193 | { | |
194 | .data_type = QMI_STRUCT, | |
195 | .elem_len = 1, | |
196 | .elem_size = sizeof(struct qmi_response_type_v01), | |
197 | .array_type = NO_ARRAY, | |
198 | .tlv_type = 0x02, | |
199 | .offset = offsetof(struct ssctl_shutdown_resp, resp), | |
200 | .ei_array = qmi_response_type_v01_ei, | |
201 | }, | |
202 | {} | |
203 | }; | |
204 | ||
205 | struct ssctl_subsys_event_req { | |
206 | u8 subsys_name_len; | |
207 | char subsys_name[SSCTL_SUBSYS_NAME_LENGTH]; | |
208 | u32 event; | |
209 | u8 evt_driven_valid; | |
210 | u32 evt_driven; | |
211 | }; | |
212 | ||
213 | static struct qmi_elem_info ssctl_subsys_event_req_ei[] = { | |
214 | { | |
215 | .data_type = QMI_DATA_LEN, | |
216 | .elem_len = 1, | |
217 | .elem_size = sizeof(uint8_t), | |
218 | .array_type = NO_ARRAY, | |
219 | .tlv_type = 0x01, | |
220 | .offset = offsetof(struct ssctl_subsys_event_req, | |
221 | subsys_name_len), | |
222 | .ei_array = NULL, | |
223 | }, | |
224 | { | |
225 | .data_type = QMI_UNSIGNED_1_BYTE, | |
226 | .elem_len = SSCTL_SUBSYS_NAME_LENGTH, | |
227 | .elem_size = sizeof(char), | |
228 | .array_type = VAR_LEN_ARRAY, | |
229 | .tlv_type = 0x01, | |
230 | .offset = offsetof(struct ssctl_subsys_event_req, | |
231 | subsys_name), | |
232 | .ei_array = NULL, | |
233 | }, | |
234 | { | |
235 | .data_type = QMI_SIGNED_4_BYTE_ENUM, | |
236 | .elem_len = 1, | |
237 | .elem_size = sizeof(uint32_t), | |
238 | .array_type = NO_ARRAY, | |
239 | .tlv_type = 0x02, | |
240 | .offset = offsetof(struct ssctl_subsys_event_req, | |
241 | event), | |
242 | .ei_array = NULL, | |
243 | }, | |
244 | { | |
245 | .data_type = QMI_OPT_FLAG, | |
246 | .elem_len = 1, | |
247 | .elem_size = sizeof(uint8_t), | |
248 | .array_type = NO_ARRAY, | |
249 | .tlv_type = 0x10, | |
250 | .offset = offsetof(struct ssctl_subsys_event_req, | |
251 | evt_driven_valid), | |
252 | .ei_array = NULL, | |
253 | }, | |
254 | { | |
255 | .data_type = QMI_SIGNED_4_BYTE_ENUM, | |
256 | .elem_len = 1, | |
257 | .elem_size = sizeof(uint32_t), | |
258 | .array_type = NO_ARRAY, | |
259 | .tlv_type = 0x10, | |
260 | .offset = offsetof(struct ssctl_subsys_event_req, | |
261 | evt_driven), | |
262 | .ei_array = NULL, | |
263 | }, | |
264 | {} | |
265 | }; | |
266 | ||
267 | struct ssctl_subsys_event_resp { | |
268 | struct qmi_response_type_v01 resp; | |
269 | }; | |
270 | ||
271 | static struct qmi_elem_info ssctl_subsys_event_resp_ei[] = { | |
272 | { | |
273 | .data_type = QMI_STRUCT, | |
274 | .elem_len = 1, | |
275 | .elem_size = sizeof(struct qmi_response_type_v01), | |
276 | .array_type = NO_ARRAY, | |
277 | .tlv_type = 0x02, | |
278 | .offset = offsetof(struct ssctl_subsys_event_resp, | |
279 | resp), | |
280 | .ei_array = qmi_response_type_v01_ei, | |
281 | }, | |
282 | {} | |
283 | }; | |
284 | ||
74f27202 SS |
285 | static struct qmi_elem_info ssctl_shutdown_ind_ei[] = { |
286 | {} | |
287 | }; | |
288 | ||
289 | static void sysmon_ind_cb(struct qmi_handle *qmi, struct sockaddr_qrtr *sq, | |
290 | struct qmi_txn *txn, const void *data) | |
291 | { | |
292 | struct qcom_sysmon *sysmon = container_of(qmi, struct qcom_sysmon, qmi); | |
293 | ||
294 | complete(&sysmon->ind_comp); | |
295 | } | |
296 | ||
dd8f5266 | 297 | static const struct qmi_msg_handler qmi_indication_handler[] = { |
74f27202 SS |
298 | { |
299 | .type = QMI_INDICATION, | |
300 | .msg_id = SSCTL_SHUTDOWN_READY_IND, | |
301 | .ei = ssctl_shutdown_ind_ei, | |
302 | .decoded_size = 0, | |
303 | .fn = sysmon_ind_cb | |
304 | }, | |
305 | {} | |
306 | }; | |
307 | ||
5c212aaf BA |
308 | static bool ssctl_request_shutdown_wait(struct qcom_sysmon *sysmon) |
309 | { | |
310 | int ret; | |
311 | ||
312 | ret = wait_for_completion_timeout(&sysmon->shutdown_comp, 10 * HZ); | |
313 | if (ret) | |
314 | return true; | |
315 | ||
316 | ret = try_wait_for_completion(&sysmon->ind_comp); | |
317 | if (ret) | |
318 | return true; | |
319 | ||
320 | dev_err(sysmon->dev, "timeout waiting for shutdown ack\n"); | |
321 | return false; | |
322 | } | |
323 | ||
1fb82ee8 BA |
324 | /** |
325 | * ssctl_request_shutdown() - request shutdown via SSCTL QMI service | |
326 | * @sysmon: sysmon context | |
5c212aaf BA |
327 | * |
328 | * Return: boolean indicator of the remote processor acking the request | |
1fb82ee8 | 329 | */ |
5c212aaf | 330 | static bool ssctl_request_shutdown(struct qcom_sysmon *sysmon) |
1fb82ee8 BA |
331 | { |
332 | struct ssctl_shutdown_resp resp; | |
333 | struct qmi_txn txn; | |
5c212aaf | 334 | bool acked = false; |
1fb82ee8 BA |
335 | int ret; |
336 | ||
74f27202 SS |
337 | reinit_completion(&sysmon->ind_comp); |
338 | reinit_completion(&sysmon->shutdown_comp); | |
1fb82ee8 BA |
339 | ret = qmi_txn_init(&sysmon->qmi, &txn, ssctl_shutdown_resp_ei, &resp); |
340 | if (ret < 0) { | |
341 | dev_err(sysmon->dev, "failed to allocate QMI txn\n"); | |
5c212aaf | 342 | return false; |
1fb82ee8 BA |
343 | } |
344 | ||
345 | ret = qmi_send_request(&sysmon->qmi, &sysmon->ssctl, &txn, | |
346 | SSCTL_SHUTDOWN_REQ, 0, NULL, NULL); | |
347 | if (ret < 0) { | |
348 | dev_err(sysmon->dev, "failed to send shutdown request\n"); | |
349 | qmi_txn_cancel(&txn); | |
5c212aaf | 350 | return false; |
1fb82ee8 BA |
351 | } |
352 | ||
353 | ret = qmi_txn_wait(&txn, 5 * HZ); | |
5c212aaf | 354 | if (ret < 0) { |
0ac72f90 | 355 | dev_err(sysmon->dev, "timeout waiting for shutdown response\n"); |
5c212aaf | 356 | } else if (resp.resp.result) { |
0ac72f90 | 357 | dev_err(sysmon->dev, "shutdown request rejected\n"); |
5c212aaf | 358 | } else { |
1fb82ee8 | 359 | dev_dbg(sysmon->dev, "shutdown request completed\n"); |
5c212aaf | 360 | acked = true; |
74f27202 | 361 | } |
5c212aaf BA |
362 | |
363 | if (sysmon->shutdown_irq > 0) | |
364 | return ssctl_request_shutdown_wait(sysmon); | |
365 | ||
366 | return acked; | |
1fb82ee8 BA |
367 | } |
368 | ||
369 | /** | |
370 | * ssctl_send_event() - send notification of other remote's SSR event | |
371 | * @sysmon: sysmon context | |
5b435ca3 | 372 | * @event: sysmon event context |
1fb82ee8 | 373 | */ |
66a4347e SG |
374 | static void ssctl_send_event(struct qcom_sysmon *sysmon, |
375 | const struct sysmon_event *event) | |
1fb82ee8 BA |
376 | { |
377 | struct ssctl_subsys_event_resp resp; | |
378 | struct ssctl_subsys_event_req req; | |
379 | struct qmi_txn txn; | |
380 | int ret; | |
381 | ||
382 | memset(&resp, 0, sizeof(resp)); | |
383 | ret = qmi_txn_init(&sysmon->qmi, &txn, ssctl_subsys_event_resp_ei, &resp); | |
384 | if (ret < 0) { | |
385 | dev_err(sysmon->dev, "failed to allocate QMI txn\n"); | |
386 | return; | |
387 | } | |
388 | ||
389 | memset(&req, 0, sizeof(req)); | |
66a4347e | 390 | strlcpy(req.subsys_name, event->subsys_name, sizeof(req.subsys_name)); |
1fb82ee8 | 391 | req.subsys_name_len = strlen(req.subsys_name); |
66a4347e | 392 | req.event = event->ssr_event; |
1fb82ee8 BA |
393 | req.evt_driven_valid = true; |
394 | req.evt_driven = SSCTL_SSR_EVENT_FORCED; | |
395 | ||
396 | ret = qmi_send_request(&sysmon->qmi, &sysmon->ssctl, &txn, | |
397 | SSCTL_SUBSYS_EVENT_REQ, 40, | |
398 | ssctl_subsys_event_req_ei, &req); | |
399 | if (ret < 0) { | |
0ac72f90 | 400 | dev_err(sysmon->dev, "failed to send subsystem event\n"); |
1fb82ee8 BA |
401 | qmi_txn_cancel(&txn); |
402 | return; | |
403 | } | |
404 | ||
405 | ret = qmi_txn_wait(&txn, 5 * HZ); | |
406 | if (ret < 0) | |
0ac72f90 | 407 | dev_err(sysmon->dev, "timeout waiting for subsystem event response\n"); |
1fb82ee8 | 408 | else if (resp.resp.result) |
0ac72f90 | 409 | dev_err(sysmon->dev, "subsystem event rejected\n"); |
1fb82ee8 | 410 | else |
0ac72f90 | 411 | dev_dbg(sysmon->dev, "subsystem event accepted\n"); |
1fb82ee8 BA |
412 | } |
413 | ||
414 | /** | |
415 | * ssctl_new_server() - QMI callback indicating a new service | |
416 | * @qmi: QMI handle | |
417 | * @svc: service information | |
418 | * | |
419 | * Return: 0 if we're interested in this service, -EINVAL otherwise. | |
420 | */ | |
421 | static int ssctl_new_server(struct qmi_handle *qmi, struct qmi_service *svc) | |
422 | { | |
423 | struct qcom_sysmon *sysmon = container_of(qmi, struct qcom_sysmon, qmi); | |
424 | ||
425 | switch (svc->version) { | |
426 | case 1: | |
427 | if (svc->instance != 0) | |
428 | return -EINVAL; | |
429 | if (strcmp(sysmon->name, "modem")) | |
430 | return -EINVAL; | |
431 | break; | |
432 | case 2: | |
433 | if (svc->instance != sysmon->ssctl_instance) | |
434 | return -EINVAL; | |
435 | break; | |
436 | default: | |
437 | return -EINVAL; | |
40f6a663 | 438 | } |
1fb82ee8 BA |
439 | |
440 | sysmon->ssctl_version = svc->version; | |
441 | ||
442 | sysmon->ssctl.sq_family = AF_QIPCRTR; | |
443 | sysmon->ssctl.sq_node = svc->node; | |
444 | sysmon->ssctl.sq_port = svc->port; | |
445 | ||
446 | svc->priv = sysmon; | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | /** | |
452 | * ssctl_del_server() - QMI callback indicating that @svc is removed | |
453 | * @qmi: QMI handle | |
454 | * @svc: service information | |
455 | */ | |
456 | static void ssctl_del_server(struct qmi_handle *qmi, struct qmi_service *svc) | |
457 | { | |
458 | struct qcom_sysmon *sysmon = svc->priv; | |
459 | ||
460 | sysmon->ssctl_version = 0; | |
461 | } | |
462 | ||
463 | static const struct qmi_ops ssctl_ops = { | |
464 | .new_server = ssctl_new_server, | |
465 | .del_server = ssctl_del_server, | |
466 | }; | |
467 | ||
1877f54f SG |
468 | static int sysmon_prepare(struct rproc_subdev *subdev) |
469 | { | |
470 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, | |
471 | subdev); | |
472 | struct sysmon_event event = { | |
473 | .subsys_name = sysmon->name, | |
474 | .ssr_event = SSCTL_SSR_EVENT_BEFORE_POWERUP | |
475 | }; | |
476 | ||
138a6428 BA |
477 | mutex_lock(&sysmon->state_lock); |
478 | sysmon->state = SSCTL_SSR_EVENT_BEFORE_POWERUP; | |
1877f54f | 479 | blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)&event); |
138a6428 | 480 | mutex_unlock(&sysmon->state_lock); |
1877f54f SG |
481 | |
482 | return 0; | |
483 | } | |
484 | ||
1f36ab3f SG |
485 | /** |
486 | * sysmon_start() - start callback for the sysmon remoteproc subdevice | |
487 | * @subdev: instance of the sysmon subdevice | |
488 | * | |
489 | * Inform all the listners of sysmon notifications that the rproc associated | |
490 | * to @subdev has booted up. The rproc that booted up also needs to know | |
491 | * which rprocs are already up and running, so send start notifications | |
492 | * on behalf of all the online rprocs. | |
493 | */ | |
1fb82ee8 BA |
494 | static int sysmon_start(struct rproc_subdev *subdev) |
495 | { | |
1877f54f SG |
496 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, |
497 | subdev); | |
1f36ab3f | 498 | struct qcom_sysmon *target; |
1877f54f SG |
499 | struct sysmon_event event = { |
500 | .subsys_name = sysmon->name, | |
501 | .ssr_event = SSCTL_SSR_EVENT_AFTER_POWERUP | |
502 | }; | |
503 | ||
138a6428 BA |
504 | mutex_lock(&sysmon->state_lock); |
505 | sysmon->state = SSCTL_SSR_EVENT_AFTER_POWERUP; | |
1877f54f | 506 | blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)&event); |
138a6428 | 507 | mutex_unlock(&sysmon->state_lock); |
1877f54f | 508 | |
1f36ab3f SG |
509 | mutex_lock(&sysmon_lock); |
510 | list_for_each_entry(target, &sysmon_list, node) { | |
138a6428 | 511 | if (target == sysmon) |
1f36ab3f SG |
512 | continue; |
513 | ||
138a6428 | 514 | mutex_lock(&target->state_lock); |
1f36ab3f | 515 | event.subsys_name = target->name; |
138a6428 | 516 | event.ssr_event = target->state; |
1f36ab3f SG |
517 | |
518 | if (sysmon->ssctl_version == 2) | |
519 | ssctl_send_event(sysmon, &event); | |
520 | else if (sysmon->ept) | |
521 | sysmon_send_event(sysmon, &event); | |
138a6428 | 522 | mutex_unlock(&target->state_lock); |
1f36ab3f SG |
523 | } |
524 | mutex_unlock(&sysmon_lock); | |
525 | ||
1fb82ee8 BA |
526 | return 0; |
527 | } | |
528 | ||
529 | static void sysmon_stop(struct rproc_subdev *subdev, bool crashed) | |
530 | { | |
531 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, subdev); | |
66a4347e SG |
532 | struct sysmon_event event = { |
533 | .subsys_name = sysmon->name, | |
534 | .ssr_event = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN | |
535 | }; | |
5c212aaf BA |
536 | |
537 | sysmon->shutdown_acked = false; | |
1fb82ee8 | 538 | |
138a6428 BA |
539 | mutex_lock(&sysmon->state_lock); |
540 | sysmon->state = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN; | |
66a4347e | 541 | blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)&event); |
138a6428 | 542 | mutex_unlock(&sysmon->state_lock); |
1fb82ee8 BA |
543 | |
544 | /* Don't request graceful shutdown if we've crashed */ | |
545 | if (crashed) | |
546 | return; | |
547 | ||
548 | if (sysmon->ssctl_version) | |
9d7b4a40 | 549 | sysmon->shutdown_acked = ssctl_request_shutdown(sysmon); |
1fb82ee8 | 550 | else if (sysmon->ept) |
9d7b4a40 | 551 | sysmon->shutdown_acked = sysmon_request_shutdown(sysmon); |
1fb82ee8 BA |
552 | } |
553 | ||
1877f54f SG |
554 | static void sysmon_unprepare(struct rproc_subdev *subdev) |
555 | { | |
556 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, | |
557 | subdev); | |
558 | struct sysmon_event event = { | |
559 | .subsys_name = sysmon->name, | |
560 | .ssr_event = SSCTL_SSR_EVENT_AFTER_SHUTDOWN | |
561 | }; | |
562 | ||
138a6428 BA |
563 | mutex_lock(&sysmon->state_lock); |
564 | sysmon->state = SSCTL_SSR_EVENT_AFTER_SHUTDOWN; | |
1877f54f | 565 | blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)&event); |
138a6428 | 566 | mutex_unlock(&sysmon->state_lock); |
1877f54f SG |
567 | } |
568 | ||
1fb82ee8 BA |
569 | /** |
570 | * sysmon_notify() - notify sysmon target of another's SSR | |
571 | * @nb: notifier_block associated with sysmon instance | |
572 | * @event: unused | |
573 | * @data: SSR identifier of the remote that is going down | |
574 | */ | |
575 | static int sysmon_notify(struct notifier_block *nb, unsigned long event, | |
576 | void *data) | |
577 | { | |
578 | struct qcom_sysmon *sysmon = container_of(nb, struct qcom_sysmon, nb); | |
66a4347e | 579 | struct sysmon_event *sysmon_event = data; |
1fb82ee8 BA |
580 | |
581 | /* Skip non-running rprocs and the originating instance */ | |
138a6428 | 582 | if (sysmon->state != SSCTL_SSR_EVENT_AFTER_POWERUP || |
66a4347e | 583 | !strcmp(sysmon_event->subsys_name, sysmon->name)) { |
1fb82ee8 BA |
584 | dev_dbg(sysmon->dev, "not notifying %s\n", sysmon->name); |
585 | return NOTIFY_DONE; | |
586 | } | |
587 | ||
588 | /* Only SSCTL version 2 supports SSR events */ | |
589 | if (sysmon->ssctl_version == 2) | |
66a4347e | 590 | ssctl_send_event(sysmon, sysmon_event); |
1fb82ee8 | 591 | else if (sysmon->ept) |
66a4347e | 592 | sysmon_send_event(sysmon, sysmon_event); |
1fb82ee8 BA |
593 | |
594 | return NOTIFY_DONE; | |
595 | } | |
596 | ||
027045a6 SS |
597 | static irqreturn_t sysmon_shutdown_interrupt(int irq, void *data) |
598 | { | |
599 | struct qcom_sysmon *sysmon = data; | |
600 | ||
601 | complete(&sysmon->shutdown_comp); | |
602 | ||
603 | return IRQ_HANDLED; | |
604 | } | |
605 | ||
1fb82ee8 BA |
606 | /** |
607 | * qcom_add_sysmon_subdev() - create a sysmon subdev for the given remoteproc | |
608 | * @rproc: rproc context to associate the subdev with | |
609 | * @name: name of this subdev, to use in SSR | |
610 | * @ssctl_instance: instance id of the ssctl QMI service | |
611 | * | |
612 | * Return: A new qcom_sysmon object, or NULL on failure | |
613 | */ | |
614 | struct qcom_sysmon *qcom_add_sysmon_subdev(struct rproc *rproc, | |
615 | const char *name, | |
616 | int ssctl_instance) | |
617 | { | |
618 | struct qcom_sysmon *sysmon; | |
619 | int ret; | |
620 | ||
621 | sysmon = kzalloc(sizeof(*sysmon), GFP_KERNEL); | |
622 | if (!sysmon) | |
027045a6 | 623 | return ERR_PTR(-ENOMEM); |
1fb82ee8 BA |
624 | |
625 | sysmon->dev = rproc->dev.parent; | |
626 | sysmon->rproc = rproc; | |
627 | ||
628 | sysmon->name = name; | |
629 | sysmon->ssctl_instance = ssctl_instance; | |
630 | ||
631 | init_completion(&sysmon->comp); | |
74f27202 | 632 | init_completion(&sysmon->ind_comp); |
027045a6 | 633 | init_completion(&sysmon->shutdown_comp); |
1fb82ee8 | 634 | mutex_init(&sysmon->lock); |
138a6428 | 635 | mutex_init(&sysmon->state_lock); |
1fb82ee8 | 636 | |
027045a6 SS |
637 | sysmon->shutdown_irq = of_irq_get_byname(sysmon->dev->of_node, |
638 | "shutdown-ack"); | |
639 | if (sysmon->shutdown_irq < 0) { | |
640 | if (sysmon->shutdown_irq != -ENODATA) { | |
641 | dev_err(sysmon->dev, | |
642 | "failed to retrieve shutdown-ack IRQ\n"); | |
643 | return ERR_PTR(sysmon->shutdown_irq); | |
644 | } | |
645 | } else { | |
646 | ret = devm_request_threaded_irq(sysmon->dev, | |
647 | sysmon->shutdown_irq, | |
648 | NULL, sysmon_shutdown_interrupt, | |
649 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
650 | "q6v5 shutdown-ack", sysmon); | |
651 | if (ret) { | |
652 | dev_err(sysmon->dev, | |
653 | "failed to acquire shutdown-ack IRQ\n"); | |
654 | return ERR_PTR(ret); | |
655 | } | |
656 | } | |
657 | ||
74f27202 SS |
658 | ret = qmi_handle_init(&sysmon->qmi, SSCTL_MAX_MSG_LEN, &ssctl_ops, |
659 | qmi_indication_handler); | |
1fb82ee8 BA |
660 | if (ret < 0) { |
661 | dev_err(sysmon->dev, "failed to initialize qmi handle\n"); | |
662 | kfree(sysmon); | |
027045a6 | 663 | return ERR_PTR(ret); |
1fb82ee8 BA |
664 | } |
665 | ||
666 | qmi_add_lookup(&sysmon->qmi, 43, 0, 0); | |
667 | ||
1877f54f | 668 | sysmon->subdev.prepare = sysmon_prepare; |
4902676f BA |
669 | sysmon->subdev.start = sysmon_start; |
670 | sysmon->subdev.stop = sysmon_stop; | |
1877f54f | 671 | sysmon->subdev.unprepare = sysmon_unprepare; |
4902676f BA |
672 | |
673 | rproc_add_subdev(rproc, &sysmon->subdev); | |
1fb82ee8 BA |
674 | |
675 | sysmon->nb.notifier_call = sysmon_notify; | |
676 | blocking_notifier_chain_register(&sysmon_notifiers, &sysmon->nb); | |
677 | ||
678 | mutex_lock(&sysmon_lock); | |
679 | list_add(&sysmon->node, &sysmon_list); | |
680 | mutex_unlock(&sysmon_lock); | |
681 | ||
682 | return sysmon; | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(qcom_add_sysmon_subdev); | |
685 | ||
686 | /** | |
687 | * qcom_remove_sysmon_subdev() - release a qcom_sysmon | |
688 | * @sysmon: sysmon context, as retrieved by qcom_add_sysmon_subdev() | |
689 | */ | |
690 | void qcom_remove_sysmon_subdev(struct qcom_sysmon *sysmon) | |
691 | { | |
692 | if (!sysmon) | |
693 | return; | |
694 | ||
695 | mutex_lock(&sysmon_lock); | |
696 | list_del(&sysmon->node); | |
697 | mutex_unlock(&sysmon_lock); | |
698 | ||
699 | blocking_notifier_chain_unregister(&sysmon_notifiers, &sysmon->nb); | |
700 | ||
701 | rproc_remove_subdev(sysmon->rproc, &sysmon->subdev); | |
702 | ||
703 | qmi_handle_release(&sysmon->qmi); | |
704 | ||
705 | kfree(sysmon); | |
706 | } | |
707 | EXPORT_SYMBOL_GPL(qcom_remove_sysmon_subdev); | |
708 | ||
5c212aaf BA |
709 | /** |
710 | * qcom_sysmon_shutdown_acked() - query the success of the last shutdown | |
711 | * @sysmon: sysmon context | |
712 | * | |
713 | * When sysmon is used to request a graceful shutdown of the remote processor | |
714 | * this can be used by the remoteproc driver to query the success, in order to | |
715 | * know if it should fall back to other means of requesting a shutdown. | |
716 | * | |
717 | * Return: boolean indicator of the success of the last shutdown request | |
718 | */ | |
719 | bool qcom_sysmon_shutdown_acked(struct qcom_sysmon *sysmon) | |
720 | { | |
721 | return sysmon && sysmon->shutdown_acked; | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(qcom_sysmon_shutdown_acked); | |
724 | ||
1fb82ee8 BA |
725 | /** |
726 | * sysmon_probe() - probe sys_mon channel | |
727 | * @rpdev: rpmsg device handle | |
728 | * | |
729 | * Find the sysmon context associated with the ancestor remoteproc and assign | |
730 | * this rpmsg device with said sysmon context. | |
731 | * | |
732 | * Return: 0 on success, negative errno on failure. | |
733 | */ | |
734 | static int sysmon_probe(struct rpmsg_device *rpdev) | |
735 | { | |
736 | struct qcom_sysmon *sysmon; | |
737 | struct rproc *rproc; | |
738 | ||
739 | rproc = rproc_get_by_child(&rpdev->dev); | |
740 | if (!rproc) { | |
741 | dev_err(&rpdev->dev, "sysmon device not child of rproc\n"); | |
742 | return -EINVAL; | |
743 | } | |
744 | ||
745 | mutex_lock(&sysmon_lock); | |
746 | list_for_each_entry(sysmon, &sysmon_list, node) { | |
747 | if (sysmon->rproc == rproc) | |
748 | goto found; | |
749 | } | |
750 | mutex_unlock(&sysmon_lock); | |
751 | ||
752 | dev_err(&rpdev->dev, "no sysmon associated with parent rproc\n"); | |
753 | ||
754 | return -EINVAL; | |
755 | ||
756 | found: | |
757 | mutex_unlock(&sysmon_lock); | |
758 | ||
759 | rpdev->ept->priv = sysmon; | |
760 | sysmon->ept = rpdev->ept; | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
765 | /** | |
766 | * sysmon_remove() - sys_mon channel remove handler | |
767 | * @rpdev: rpmsg device handle | |
768 | * | |
769 | * Disassociate the rpmsg device with the sysmon instance. | |
770 | */ | |
771 | static void sysmon_remove(struct rpmsg_device *rpdev) | |
772 | { | |
773 | struct qcom_sysmon *sysmon = rpdev->ept->priv; | |
774 | ||
775 | sysmon->ept = NULL; | |
776 | } | |
777 | ||
778 | static const struct rpmsg_device_id sysmon_match[] = { | |
779 | { "sys_mon" }, | |
780 | {} | |
781 | }; | |
782 | ||
783 | static struct rpmsg_driver sysmon_driver = { | |
784 | .probe = sysmon_probe, | |
785 | .remove = sysmon_remove, | |
786 | .callback = sysmon_callback, | |
787 | .id_table = sysmon_match, | |
788 | .drv = { | |
789 | .name = "qcom_sysmon", | |
790 | }, | |
791 | }; | |
792 | ||
793 | module_rpmsg_driver(sysmon_driver); | |
794 | ||
795 | MODULE_DESCRIPTION("Qualcomm sysmon driver"); | |
796 | MODULE_LICENSE("GPL v2"); |