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