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> |
9 | #include <linux/interrupt.h> |
10 | #include <linux/io.h> |
11 | #include <linux/of_irq.h> |
12 | #include <linux/platform_device.h> |
13 | #include <linux/remoteproc/qcom_rproc.h> |
14 | #include <linux/rpmsg.h> |
15 | |
16 | #include "qcom_common.h" |
17 | |
18 | static BLOCKING_NOTIFIER_HEAD(sysmon_notifiers); |
19 | |
20 | struct qcom_sysmon { |
21 | struct rproc_subdev subdev; |
22 | struct rproc *rproc; |
23 | |
24 | int state; |
25 | struct mutex state_lock; |
26 | |
27 | struct list_head node; |
28 | |
29 | const char *name; |
30 | |
31 | int shutdown_irq; |
32 | int ssctl_version; |
33 | int ssctl_instance; |
34 | |
35 | struct notifier_block nb; |
36 | |
37 | struct device *dev; |
38 | |
39 | struct rpmsg_endpoint *ept; |
40 | struct completion comp; |
41 | struct completion ind_comp; |
42 | struct completion shutdown_comp; |
43 | struct completion ssctl_comp; |
44 | struct mutex lock; |
45 | |
46 | bool ssr_ack; |
47 | bool shutdown_acked; |
48 | |
49 | struct qmi_handle qmi; |
50 | struct sockaddr_qrtr ssctl; |
51 | }; |
52 | |
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 | |
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 |
78 | * @event: sysmon event context |
79 | */ |
80 | static void sysmon_send_event(struct qcom_sysmon *sysmon, |
81 | const struct sysmon_event *event) |
82 | { |
83 | char req[50]; |
84 | int len; |
85 | int ret; |
86 | |
87 | len = snprintf(buf: req, size: sizeof(req), fmt: "ssr:%s:%s" , event->subsys_name, |
88 | sysmon_state_string[event->ssr_event]); |
89 | if (len >= sizeof(req)) |
90 | return; |
91 | |
92 | mutex_lock(&sysmon->lock); |
93 | reinit_completion(x: &sysmon->comp); |
94 | sysmon->ssr_ack = false; |
95 | |
96 | ret = rpmsg_send(ept: sysmon->ept, data: 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(x: &sysmon->comp, |
103 | timeout: msecs_to_jiffies(m: 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(lock: &sysmon->lock); |
114 | } |
115 | |
116 | /** |
117 | * sysmon_request_shutdown() - request graceful shutdown of remote |
118 | * @sysmon: sysmon context |
119 | * |
120 | * Return: boolean indicator of the remote processor acking the request |
121 | */ |
122 | static bool sysmon_request_shutdown(struct qcom_sysmon *sysmon) |
123 | { |
124 | char *req = "ssr:shutdown" ; |
125 | bool acked = false; |
126 | int ret; |
127 | |
128 | mutex_lock(&sysmon->lock); |
129 | reinit_completion(x: &sysmon->comp); |
130 | sysmon->ssr_ack = false; |
131 | |
132 | ret = rpmsg_send(ept: sysmon->ept, data: 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(x: &sysmon->comp, |
139 | timeout: msecs_to_jiffies(m: 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" ); |
148 | else |
149 | acked = true; |
150 | |
151 | out_unlock: |
152 | mutex_unlock(lock: &sysmon->lock); |
153 | |
154 | return acked; |
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(p: data, q: ssr_ack, size: 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 |
176 | #define SSCTL_SHUTDOWN_READY_IND 0x21 |
177 | #define SSCTL_SUBSYS_EVENT_REQ 0x23 |
178 | |
179 | #define SSCTL_MAX_MSG_LEN 7 |
180 | |
181 | #define SSCTL_SUBSYS_NAME_LENGTH 15 |
182 | |
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 const 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 const 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 const 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 | |
285 | static const 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 | |
297 | static const struct qmi_msg_handler qmi_indication_handler[] = { |
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 | |
308 | static bool ssctl_request_shutdown_wait(struct qcom_sysmon *sysmon) |
309 | { |
310 | int ret; |
311 | |
312 | ret = wait_for_completion_timeout(x: &sysmon->shutdown_comp, timeout: 10 * HZ); |
313 | if (ret) |
314 | return true; |
315 | |
316 | ret = try_wait_for_completion(x: &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 | |
324 | /** |
325 | * ssctl_request_shutdown() - request shutdown via SSCTL QMI service |
326 | * @sysmon: sysmon context |
327 | * |
328 | * Return: boolean indicator of the remote processor acking the request |
329 | */ |
330 | static bool ssctl_request_shutdown(struct qcom_sysmon *sysmon) |
331 | { |
332 | struct ssctl_shutdown_resp resp; |
333 | struct qmi_txn txn; |
334 | bool acked = false; |
335 | int ret; |
336 | |
337 | reinit_completion(x: &sysmon->ind_comp); |
338 | reinit_completion(x: &sysmon->shutdown_comp); |
339 | ret = qmi_txn_init(qmi: &sysmon->qmi, txn: &txn, ei: ssctl_shutdown_resp_ei, c_struct: &resp); |
340 | if (ret < 0) { |
341 | dev_err(sysmon->dev, "failed to allocate QMI txn\n" ); |
342 | return false; |
343 | } |
344 | |
345 | ret = qmi_send_request(qmi: &sysmon->qmi, sq: &sysmon->ssctl, txn: &txn, |
346 | SSCTL_SHUTDOWN_REQ, len: 0, NULL, NULL); |
347 | if (ret < 0) { |
348 | dev_err(sysmon->dev, "failed to send shutdown request\n" ); |
349 | qmi_txn_cancel(txn: &txn); |
350 | return false; |
351 | } |
352 | |
353 | ret = qmi_txn_wait(txn: &txn, timeout: 5 * HZ); |
354 | if (ret < 0) { |
355 | dev_err(sysmon->dev, "timeout waiting for shutdown response\n" ); |
356 | } else if (resp.resp.result) { |
357 | dev_err(sysmon->dev, "shutdown request rejected\n" ); |
358 | } else { |
359 | dev_dbg(sysmon->dev, "shutdown request completed\n" ); |
360 | acked = true; |
361 | } |
362 | |
363 | if (sysmon->shutdown_irq > 0) |
364 | return ssctl_request_shutdown_wait(sysmon); |
365 | |
366 | return acked; |
367 | } |
368 | |
369 | /** |
370 | * ssctl_send_event() - send notification of other remote's SSR event |
371 | * @sysmon: sysmon context |
372 | * @event: sysmon event context |
373 | */ |
374 | static void ssctl_send_event(struct qcom_sysmon *sysmon, |
375 | const struct sysmon_event *event) |
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(qmi: &sysmon->qmi, txn: &txn, ei: ssctl_subsys_event_resp_ei, c_struct: &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)); |
390 | strscpy(p: req.subsys_name, q: event->subsys_name, size: sizeof(req.subsys_name)); |
391 | req.subsys_name_len = strlen(req.subsys_name); |
392 | req.event = event->ssr_event; |
393 | req.evt_driven_valid = true; |
394 | req.evt_driven = SSCTL_SSR_EVENT_FORCED; |
395 | |
396 | ret = qmi_send_request(qmi: &sysmon->qmi, sq: &sysmon->ssctl, txn: &txn, |
397 | SSCTL_SUBSYS_EVENT_REQ, len: 40, |
398 | ei: ssctl_subsys_event_req_ei, c_struct: &req); |
399 | if (ret < 0) { |
400 | dev_err(sysmon->dev, "failed to send subsystem event\n" ); |
401 | qmi_txn_cancel(txn: &txn); |
402 | return; |
403 | } |
404 | |
405 | ret = qmi_txn_wait(txn: &txn, timeout: 5 * HZ); |
406 | if (ret < 0) |
407 | dev_err(sysmon->dev, "timeout waiting for subsystem event response\n" ); |
408 | else if (resp.resp.result) |
409 | dev_err(sysmon->dev, "subsystem event rejected\n" ); |
410 | else |
411 | dev_dbg(sysmon->dev, "subsystem event accepted\n" ); |
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; |
438 | } |
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 | complete(&sysmon->ssctl_comp); |
449 | |
450 | return 0; |
451 | } |
452 | |
453 | /** |
454 | * ssctl_del_server() - QMI callback indicating that @svc is removed |
455 | * @qmi: QMI handle |
456 | * @svc: service information |
457 | */ |
458 | static void ssctl_del_server(struct qmi_handle *qmi, struct qmi_service *svc) |
459 | { |
460 | struct qcom_sysmon *sysmon = svc->priv; |
461 | |
462 | sysmon->ssctl_version = 0; |
463 | } |
464 | |
465 | static const struct qmi_ops ssctl_ops = { |
466 | .new_server = ssctl_new_server, |
467 | .del_server = ssctl_del_server, |
468 | }; |
469 | |
470 | static int sysmon_prepare(struct rproc_subdev *subdev) |
471 | { |
472 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, |
473 | subdev); |
474 | struct sysmon_event event = { |
475 | .subsys_name = sysmon->name, |
476 | .ssr_event = SSCTL_SSR_EVENT_BEFORE_POWERUP |
477 | }; |
478 | |
479 | mutex_lock(&sysmon->state_lock); |
480 | sysmon->state = SSCTL_SSR_EVENT_BEFORE_POWERUP; |
481 | blocking_notifier_call_chain(nh: &sysmon_notifiers, val: 0, v: (void *)&event); |
482 | mutex_unlock(lock: &sysmon->state_lock); |
483 | |
484 | return 0; |
485 | } |
486 | |
487 | /** |
488 | * sysmon_start() - start callback for the sysmon remoteproc subdevice |
489 | * @subdev: instance of the sysmon subdevice |
490 | * |
491 | * Inform all the listners of sysmon notifications that the rproc associated |
492 | * to @subdev has booted up. The rproc that booted up also needs to know |
493 | * which rprocs are already up and running, so send start notifications |
494 | * on behalf of all the online rprocs. |
495 | */ |
496 | static int sysmon_start(struct rproc_subdev *subdev) |
497 | { |
498 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, |
499 | subdev); |
500 | struct qcom_sysmon *target; |
501 | struct sysmon_event event = { |
502 | .subsys_name = sysmon->name, |
503 | .ssr_event = SSCTL_SSR_EVENT_AFTER_POWERUP |
504 | }; |
505 | |
506 | reinit_completion(x: &sysmon->ssctl_comp); |
507 | mutex_lock(&sysmon->state_lock); |
508 | sysmon->state = SSCTL_SSR_EVENT_AFTER_POWERUP; |
509 | blocking_notifier_call_chain(nh: &sysmon_notifiers, val: 0, v: (void *)&event); |
510 | mutex_unlock(lock: &sysmon->state_lock); |
511 | |
512 | mutex_lock(&sysmon_lock); |
513 | list_for_each_entry(target, &sysmon_list, node) { |
514 | mutex_lock(&target->state_lock); |
515 | if (target == sysmon || target->state != SSCTL_SSR_EVENT_AFTER_POWERUP) { |
516 | mutex_unlock(lock: &target->state_lock); |
517 | continue; |
518 | } |
519 | |
520 | event.subsys_name = target->name; |
521 | event.ssr_event = target->state; |
522 | |
523 | if (sysmon->ssctl_version == 2) |
524 | ssctl_send_event(sysmon, event: &event); |
525 | else if (sysmon->ept) |
526 | sysmon_send_event(sysmon, event: &event); |
527 | mutex_unlock(lock: &target->state_lock); |
528 | } |
529 | mutex_unlock(lock: &sysmon_lock); |
530 | |
531 | return 0; |
532 | } |
533 | |
534 | static void sysmon_stop(struct rproc_subdev *subdev, bool crashed) |
535 | { |
536 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, subdev); |
537 | struct sysmon_event event = { |
538 | .subsys_name = sysmon->name, |
539 | .ssr_event = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN |
540 | }; |
541 | |
542 | sysmon->shutdown_acked = false; |
543 | |
544 | mutex_lock(&sysmon->state_lock); |
545 | sysmon->state = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN; |
546 | blocking_notifier_call_chain(nh: &sysmon_notifiers, val: 0, v: (void *)&event); |
547 | mutex_unlock(lock: &sysmon->state_lock); |
548 | |
549 | /* Don't request graceful shutdown if we've crashed */ |
550 | if (crashed) |
551 | return; |
552 | |
553 | if (sysmon->ssctl_instance) { |
554 | if (!wait_for_completion_timeout(x: &sysmon->ssctl_comp, HZ / 2)) |
555 | dev_err(sysmon->dev, "timeout waiting for ssctl service\n" ); |
556 | } |
557 | |
558 | if (sysmon->ssctl_version) |
559 | sysmon->shutdown_acked = ssctl_request_shutdown(sysmon); |
560 | else if (sysmon->ept) |
561 | sysmon->shutdown_acked = sysmon_request_shutdown(sysmon); |
562 | } |
563 | |
564 | static void sysmon_unprepare(struct rproc_subdev *subdev) |
565 | { |
566 | struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, |
567 | subdev); |
568 | struct sysmon_event event = { |
569 | .subsys_name = sysmon->name, |
570 | .ssr_event = SSCTL_SSR_EVENT_AFTER_SHUTDOWN |
571 | }; |
572 | |
573 | mutex_lock(&sysmon->state_lock); |
574 | sysmon->state = SSCTL_SSR_EVENT_AFTER_SHUTDOWN; |
575 | blocking_notifier_call_chain(nh: &sysmon_notifiers, val: 0, v: (void *)&event); |
576 | mutex_unlock(lock: &sysmon->state_lock); |
577 | } |
578 | |
579 | /** |
580 | * sysmon_notify() - notify sysmon target of another's SSR |
581 | * @nb: notifier_block associated with sysmon instance |
582 | * @event: unused |
583 | * @data: SSR identifier of the remote that is going down |
584 | */ |
585 | static int sysmon_notify(struct notifier_block *nb, unsigned long event, |
586 | void *data) |
587 | { |
588 | struct qcom_sysmon *sysmon = container_of(nb, struct qcom_sysmon, nb); |
589 | struct sysmon_event *sysmon_event = data; |
590 | |
591 | /* Skip non-running rprocs and the originating instance */ |
592 | if (sysmon->state != SSCTL_SSR_EVENT_AFTER_POWERUP || |
593 | !strcmp(sysmon_event->subsys_name, sysmon->name)) { |
594 | dev_dbg(sysmon->dev, "not notifying %s\n" , sysmon->name); |
595 | return NOTIFY_DONE; |
596 | } |
597 | |
598 | /* Only SSCTL version 2 supports SSR events */ |
599 | if (sysmon->ssctl_version == 2) |
600 | ssctl_send_event(sysmon, event: sysmon_event); |
601 | else if (sysmon->ept) |
602 | sysmon_send_event(sysmon, event: sysmon_event); |
603 | |
604 | return NOTIFY_DONE; |
605 | } |
606 | |
607 | static irqreturn_t sysmon_shutdown_interrupt(int irq, void *data) |
608 | { |
609 | struct qcom_sysmon *sysmon = data; |
610 | |
611 | complete(&sysmon->shutdown_comp); |
612 | |
613 | return IRQ_HANDLED; |
614 | } |
615 | |
616 | /** |
617 | * qcom_add_sysmon_subdev() - create a sysmon subdev for the given remoteproc |
618 | * @rproc: rproc context to associate the subdev with |
619 | * @name: name of this subdev, to use in SSR |
620 | * @ssctl_instance: instance id of the ssctl QMI service |
621 | * |
622 | * Return: A new qcom_sysmon object, or NULL on failure |
623 | */ |
624 | struct qcom_sysmon *qcom_add_sysmon_subdev(struct rproc *rproc, |
625 | const char *name, |
626 | int ssctl_instance) |
627 | { |
628 | struct qcom_sysmon *sysmon; |
629 | int ret; |
630 | |
631 | sysmon = kzalloc(size: sizeof(*sysmon), GFP_KERNEL); |
632 | if (!sysmon) |
633 | return ERR_PTR(error: -ENOMEM); |
634 | |
635 | sysmon->dev = rproc->dev.parent; |
636 | sysmon->rproc = rproc; |
637 | |
638 | sysmon->name = name; |
639 | sysmon->ssctl_instance = ssctl_instance; |
640 | |
641 | init_completion(x: &sysmon->comp); |
642 | init_completion(x: &sysmon->ind_comp); |
643 | init_completion(x: &sysmon->shutdown_comp); |
644 | init_completion(x: &sysmon->ssctl_comp); |
645 | mutex_init(&sysmon->lock); |
646 | mutex_init(&sysmon->state_lock); |
647 | |
648 | sysmon->shutdown_irq = of_irq_get_byname(dev: sysmon->dev->of_node, |
649 | name: "shutdown-ack" ); |
650 | if (sysmon->shutdown_irq < 0) { |
651 | if (sysmon->shutdown_irq != -ENODATA) { |
652 | dev_err(sysmon->dev, |
653 | "failed to retrieve shutdown-ack IRQ\n" ); |
654 | ret = sysmon->shutdown_irq; |
655 | kfree(objp: sysmon); |
656 | return ERR_PTR(error: ret); |
657 | } |
658 | } else { |
659 | ret = devm_request_threaded_irq(dev: sysmon->dev, |
660 | irq: sysmon->shutdown_irq, |
661 | NULL, thread_fn: sysmon_shutdown_interrupt, |
662 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
663 | devname: "q6v5 shutdown-ack" , dev_id: sysmon); |
664 | if (ret) { |
665 | dev_err(sysmon->dev, |
666 | "failed to acquire shutdown-ack IRQ\n" ); |
667 | kfree(objp: sysmon); |
668 | return ERR_PTR(error: ret); |
669 | } |
670 | } |
671 | |
672 | ret = qmi_handle_init(qmi: &sysmon->qmi, SSCTL_MAX_MSG_LEN, ops: &ssctl_ops, |
673 | handlers: qmi_indication_handler); |
674 | if (ret < 0) { |
675 | dev_err(sysmon->dev, "failed to initialize qmi handle\n" ); |
676 | kfree(objp: sysmon); |
677 | return ERR_PTR(error: ret); |
678 | } |
679 | |
680 | qmi_add_lookup(qmi: &sysmon->qmi, service: 43, version: 0, instance: 0); |
681 | |
682 | sysmon->subdev.prepare = sysmon_prepare; |
683 | sysmon->subdev.start = sysmon_start; |
684 | sysmon->subdev.stop = sysmon_stop; |
685 | sysmon->subdev.unprepare = sysmon_unprepare; |
686 | |
687 | rproc_add_subdev(rproc, subdev: &sysmon->subdev); |
688 | |
689 | sysmon->nb.notifier_call = sysmon_notify; |
690 | blocking_notifier_chain_register(nh: &sysmon_notifiers, nb: &sysmon->nb); |
691 | |
692 | mutex_lock(&sysmon_lock); |
693 | list_add(new: &sysmon->node, head: &sysmon_list); |
694 | mutex_unlock(lock: &sysmon_lock); |
695 | |
696 | return sysmon; |
697 | } |
698 | EXPORT_SYMBOL_GPL(qcom_add_sysmon_subdev); |
699 | |
700 | /** |
701 | * qcom_remove_sysmon_subdev() - release a qcom_sysmon |
702 | * @sysmon: sysmon context, as retrieved by qcom_add_sysmon_subdev() |
703 | */ |
704 | void qcom_remove_sysmon_subdev(struct qcom_sysmon *sysmon) |
705 | { |
706 | if (!sysmon) |
707 | return; |
708 | |
709 | mutex_lock(&sysmon_lock); |
710 | list_del(entry: &sysmon->node); |
711 | mutex_unlock(lock: &sysmon_lock); |
712 | |
713 | blocking_notifier_chain_unregister(nh: &sysmon_notifiers, nb: &sysmon->nb); |
714 | |
715 | rproc_remove_subdev(rproc: sysmon->rproc, subdev: &sysmon->subdev); |
716 | |
717 | qmi_handle_release(qmi: &sysmon->qmi); |
718 | |
719 | kfree(objp: sysmon); |
720 | } |
721 | EXPORT_SYMBOL_GPL(qcom_remove_sysmon_subdev); |
722 | |
723 | /** |
724 | * qcom_sysmon_shutdown_acked() - query the success of the last shutdown |
725 | * @sysmon: sysmon context |
726 | * |
727 | * When sysmon is used to request a graceful shutdown of the remote processor |
728 | * this can be used by the remoteproc driver to query the success, in order to |
729 | * know if it should fall back to other means of requesting a shutdown. |
730 | * |
731 | * Return: boolean indicator of the success of the last shutdown request |
732 | */ |
733 | bool qcom_sysmon_shutdown_acked(struct qcom_sysmon *sysmon) |
734 | { |
735 | return sysmon && sysmon->shutdown_acked; |
736 | } |
737 | EXPORT_SYMBOL_GPL(qcom_sysmon_shutdown_acked); |
738 | |
739 | /** |
740 | * sysmon_probe() - probe sys_mon channel |
741 | * @rpdev: rpmsg device handle |
742 | * |
743 | * Find the sysmon context associated with the ancestor remoteproc and assign |
744 | * this rpmsg device with said sysmon context. |
745 | * |
746 | * Return: 0 on success, negative errno on failure. |
747 | */ |
748 | static int sysmon_probe(struct rpmsg_device *rpdev) |
749 | { |
750 | struct qcom_sysmon *sysmon; |
751 | struct rproc *rproc; |
752 | |
753 | rproc = rproc_get_by_child(dev: &rpdev->dev); |
754 | if (!rproc) { |
755 | dev_err(&rpdev->dev, "sysmon device not child of rproc\n" ); |
756 | return -EINVAL; |
757 | } |
758 | |
759 | mutex_lock(&sysmon_lock); |
760 | list_for_each_entry(sysmon, &sysmon_list, node) { |
761 | if (sysmon->rproc == rproc) |
762 | goto found; |
763 | } |
764 | mutex_unlock(lock: &sysmon_lock); |
765 | |
766 | dev_err(&rpdev->dev, "no sysmon associated with parent rproc\n" ); |
767 | |
768 | return -EINVAL; |
769 | |
770 | found: |
771 | mutex_unlock(lock: &sysmon_lock); |
772 | |
773 | rpdev->ept->priv = sysmon; |
774 | sysmon->ept = rpdev->ept; |
775 | |
776 | return 0; |
777 | } |
778 | |
779 | /** |
780 | * sysmon_remove() - sys_mon channel remove handler |
781 | * @rpdev: rpmsg device handle |
782 | * |
783 | * Disassociate the rpmsg device with the sysmon instance. |
784 | */ |
785 | static void sysmon_remove(struct rpmsg_device *rpdev) |
786 | { |
787 | struct qcom_sysmon *sysmon = rpdev->ept->priv; |
788 | |
789 | sysmon->ept = NULL; |
790 | } |
791 | |
792 | static const struct rpmsg_device_id sysmon_match[] = { |
793 | { "sys_mon" }, |
794 | {} |
795 | }; |
796 | |
797 | static struct rpmsg_driver sysmon_driver = { |
798 | .probe = sysmon_probe, |
799 | .remove = sysmon_remove, |
800 | .callback = sysmon_callback, |
801 | .id_table = sysmon_match, |
802 | .drv = { |
803 | .name = "qcom_sysmon" , |
804 | }, |
805 | }; |
806 | |
807 | module_rpmsg_driver(sysmon_driver); |
808 | |
809 | MODULE_DESCRIPTION("Qualcomm sysmon driver" ); |
810 | MODULE_LICENSE("GPL v2" ); |
811 | |