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ad6eb31e JM |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2017 Arm Ltd. | |
3 | #define pr_fmt(fmt) "sdei: " fmt | |
4 | ||
f96935d3 | 5 | #include <acpi/ghes.h> |
ad6eb31e JM |
6 | #include <linux/acpi.h> |
7 | #include <linux/arm_sdei.h> | |
8 | #include <linux/arm-smccc.h> | |
f92b5462 | 9 | #include <linux/atomic.h> |
ad6eb31e JM |
10 | #include <linux/bitops.h> |
11 | #include <linux/compiler.h> | |
da351827 | 12 | #include <linux/cpuhotplug.h> |
f92b5462 | 13 | #include <linux/cpu.h> |
da351827 | 14 | #include <linux/cpu_pm.h> |
ad6eb31e JM |
15 | #include <linux/errno.h> |
16 | #include <linux/hardirq.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/kprobes.h> | |
19 | #include <linux/kvm_host.h> | |
20 | #include <linux/list.h> | |
21 | #include <linux/mutex.h> | |
da351827 | 22 | #include <linux/notifier.h> |
ad6eb31e JM |
23 | #include <linux/of.h> |
24 | #include <linux/of_platform.h> | |
25 | #include <linux/percpu.h> | |
26 | #include <linux/platform_device.h> | |
da351827 | 27 | #include <linux/pm.h> |
ad6eb31e JM |
28 | #include <linux/ptrace.h> |
29 | #include <linux/preempt.h> | |
da351827 | 30 | #include <linux/reboot.h> |
ad6eb31e JM |
31 | #include <linux/slab.h> |
32 | #include <linux/smp.h> | |
33 | #include <linux/spinlock.h> | |
ad6eb31e JM |
34 | |
35 | /* | |
36 | * The call to use to reach the firmware. | |
37 | */ | |
38 | static asmlinkage void (*sdei_firmware_call)(unsigned long function_id, | |
39 | unsigned long arg0, unsigned long arg1, | |
40 | unsigned long arg2, unsigned long arg3, | |
41 | unsigned long arg4, struct arm_smccc_res *res); | |
42 | ||
43 | /* entry point from firmware to arch asm code */ | |
44 | static unsigned long sdei_entry_point; | |
45 | ||
d2c48b23 PG |
46 | static int sdei_hp_state; |
47 | ||
ad6eb31e | 48 | struct sdei_event { |
da351827 | 49 | /* These three are protected by the sdei_list_lock */ |
ad6eb31e | 50 | struct list_head list; |
da351827 JM |
51 | bool reregister; |
52 | bool reenable; | |
53 | ||
ad6eb31e JM |
54 | u32 event_num; |
55 | u8 type; | |
56 | u8 priority; | |
57 | ||
58 | /* This pointer is handed to firmware as the event argument. */ | |
f92b5462 JM |
59 | union { |
60 | /* Shared events */ | |
61 | struct sdei_registered_event *registered; | |
62 | ||
63 | /* CPU private events */ | |
64 | struct sdei_registered_event __percpu *private_registered; | |
65 | }; | |
ad6eb31e JM |
66 | }; |
67 | ||
68 | /* Take the mutex for any API call or modification. Take the mutex first. */ | |
69 | static DEFINE_MUTEX(sdei_events_lock); | |
70 | ||
71 | /* and then hold this when modifying the list */ | |
72 | static DEFINE_SPINLOCK(sdei_list_lock); | |
73 | static LIST_HEAD(sdei_list); | |
74 | ||
f92b5462 JM |
75 | /* Private events are registered/enabled via IPI passing one of these */ |
76 | struct sdei_crosscall_args { | |
77 | struct sdei_event *event; | |
78 | atomic_t errors; | |
79 | int first_error; | |
80 | }; | |
81 | ||
a27c04e1 GS |
82 | #define CROSSCALL_INIT(arg, event) \ |
83 | do { \ | |
84 | arg.event = event; \ | |
85 | arg.first_error = 0; \ | |
86 | atomic_set(&arg.errors, 0); \ | |
87 | } while (0) | |
f92b5462 | 88 | |
f4673625 GS |
89 | static inline int sdei_do_local_call(smp_call_func_t fn, |
90 | struct sdei_event *event) | |
91 | { | |
92 | struct sdei_crosscall_args arg; | |
93 | ||
94 | CROSSCALL_INIT(arg, event); | |
95 | fn(&arg); | |
96 | ||
97 | return arg.first_error; | |
98 | } | |
99 | ||
a27c04e1 GS |
100 | static inline int sdei_do_cross_call(smp_call_func_t fn, |
101 | struct sdei_event *event) | |
f92b5462 JM |
102 | { |
103 | struct sdei_crosscall_args arg; | |
104 | ||
105 | CROSSCALL_INIT(arg, event); | |
106 | on_each_cpu(fn, &arg, true); | |
107 | ||
108 | return arg.first_error; | |
109 | } | |
110 | ||
111 | static inline void | |
112 | sdei_cross_call_return(struct sdei_crosscall_args *arg, int err) | |
113 | { | |
114 | if (err && (atomic_inc_return(&arg->errors) == 1)) | |
115 | arg->first_error = err; | |
116 | } | |
117 | ||
ad6eb31e JM |
118 | static int sdei_to_linux_errno(unsigned long sdei_err) |
119 | { | |
120 | switch (sdei_err) { | |
121 | case SDEI_NOT_SUPPORTED: | |
122 | return -EOPNOTSUPP; | |
123 | case SDEI_INVALID_PARAMETERS: | |
124 | return -EINVAL; | |
125 | case SDEI_DENIED: | |
126 | return -EPERM; | |
127 | case SDEI_PENDING: | |
128 | return -EINPROGRESS; | |
129 | case SDEI_OUT_OF_RESOURCE: | |
130 | return -ENOMEM; | |
131 | } | |
132 | ||
5735f515 | 133 | return 0; |
ad6eb31e JM |
134 | } |
135 | ||
136 | static int invoke_sdei_fn(unsigned long function_id, unsigned long arg0, | |
137 | unsigned long arg1, unsigned long arg2, | |
138 | unsigned long arg3, unsigned long arg4, | |
139 | u64 *result) | |
140 | { | |
5735f515 | 141 | int err; |
ad6eb31e JM |
142 | struct arm_smccc_res res; |
143 | ||
144 | if (sdei_firmware_call) { | |
145 | sdei_firmware_call(function_id, arg0, arg1, arg2, arg3, arg4, | |
146 | &res); | |
5735f515 | 147 | err = sdei_to_linux_errno(res.a0); |
ad6eb31e JM |
148 | } else { |
149 | /* | |
150 | * !sdei_firmware_call means we failed to probe or called | |
151 | * sdei_mark_interface_broken(). -EIO is not an error returned | |
152 | * by sdei_to_linux_errno() and is used to suppress messages | |
153 | * from this driver. | |
154 | */ | |
155 | err = -EIO; | |
156 | res.a0 = SDEI_NOT_SUPPORTED; | |
157 | } | |
158 | ||
159 | if (result) | |
160 | *result = res.a0; | |
161 | ||
162 | return err; | |
163 | } | |
2f1d4e24 | 164 | NOKPROBE_SYMBOL(invoke_sdei_fn); |
ad6eb31e JM |
165 | |
166 | static struct sdei_event *sdei_event_find(u32 event_num) | |
167 | { | |
168 | struct sdei_event *e, *found = NULL; | |
169 | ||
170 | lockdep_assert_held(&sdei_events_lock); | |
171 | ||
172 | spin_lock(&sdei_list_lock); | |
173 | list_for_each_entry(e, &sdei_list, list) { | |
174 | if (e->event_num == event_num) { | |
175 | found = e; | |
176 | break; | |
177 | } | |
178 | } | |
179 | spin_unlock(&sdei_list_lock); | |
180 | ||
181 | return found; | |
182 | } | |
183 | ||
184 | int sdei_api_event_context(u32 query, u64 *result) | |
185 | { | |
186 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_CONTEXT, query, 0, 0, 0, 0, | |
187 | result); | |
188 | } | |
189 | NOKPROBE_SYMBOL(sdei_api_event_context); | |
190 | ||
191 | static int sdei_api_event_get_info(u32 event, u32 info, u64 *result) | |
192 | { | |
193 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_GET_INFO, event, info, 0, | |
194 | 0, 0, result); | |
195 | } | |
196 | ||
197 | static struct sdei_event *sdei_event_create(u32 event_num, | |
198 | sdei_event_callback *cb, | |
199 | void *cb_arg) | |
200 | { | |
201 | int err; | |
202 | u64 result; | |
203 | struct sdei_event *event; | |
204 | struct sdei_registered_event *reg; | |
205 | ||
206 | lockdep_assert_held(&sdei_events_lock); | |
207 | ||
208 | event = kzalloc(sizeof(*event), GFP_KERNEL); | |
11988424 GS |
209 | if (!event) { |
210 | err = -ENOMEM; | |
211 | goto fail; | |
212 | } | |
ad6eb31e JM |
213 | |
214 | INIT_LIST_HEAD(&event->list); | |
215 | event->event_num = event_num; | |
216 | ||
217 | err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY, | |
218 | &result); | |
11988424 GS |
219 | if (err) |
220 | goto fail; | |
ad6eb31e JM |
221 | event->priority = result; |
222 | ||
223 | err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_TYPE, | |
224 | &result); | |
11988424 GS |
225 | if (err) |
226 | goto fail; | |
ad6eb31e JM |
227 | event->type = result; |
228 | ||
229 | if (event->type == SDEI_EVENT_TYPE_SHARED) { | |
230 | reg = kzalloc(sizeof(*reg), GFP_KERNEL); | |
231 | if (!reg) { | |
11988424 GS |
232 | err = -ENOMEM; |
233 | goto fail; | |
ad6eb31e JM |
234 | } |
235 | ||
663c0e89 | 236 | reg->event_num = event->event_num; |
ad6eb31e JM |
237 | reg->priority = event->priority; |
238 | ||
239 | reg->callback = cb; | |
240 | reg->callback_arg = cb_arg; | |
241 | event->registered = reg; | |
f92b5462 JM |
242 | } else { |
243 | int cpu; | |
244 | struct sdei_registered_event __percpu *regs; | |
245 | ||
246 | regs = alloc_percpu(struct sdei_registered_event); | |
247 | if (!regs) { | |
11988424 GS |
248 | err = -ENOMEM; |
249 | goto fail; | |
f92b5462 JM |
250 | } |
251 | ||
252 | for_each_possible_cpu(cpu) { | |
253 | reg = per_cpu_ptr(regs, cpu); | |
254 | ||
255 | reg->event_num = event->event_num; | |
256 | reg->priority = event->priority; | |
257 | reg->callback = cb; | |
258 | reg->callback_arg = cb_arg; | |
259 | } | |
260 | ||
261 | event->private_registered = regs; | |
ad6eb31e JM |
262 | } |
263 | ||
f7d5ef0c LZ |
264 | spin_lock(&sdei_list_lock); |
265 | list_add(&event->list, &sdei_list); | |
266 | spin_unlock(&sdei_list_lock); | |
ad6eb31e JM |
267 | |
268 | return event; | |
11988424 GS |
269 | |
270 | fail: | |
271 | kfree(event); | |
272 | return ERR_PTR(err); | |
ad6eb31e JM |
273 | } |
274 | ||
c66d52b1 | 275 | static void sdei_event_destroy_llocked(struct sdei_event *event) |
ad6eb31e JM |
276 | { |
277 | lockdep_assert_held(&sdei_events_lock); | |
c66d52b1 | 278 | lockdep_assert_held(&sdei_list_lock); |
ad6eb31e | 279 | |
ad6eb31e | 280 | list_del(&event->list); |
ad6eb31e JM |
281 | |
282 | if (event->type == SDEI_EVENT_TYPE_SHARED) | |
283 | kfree(event->registered); | |
f92b5462 JM |
284 | else |
285 | free_percpu(event->private_registered); | |
ad6eb31e JM |
286 | |
287 | kfree(event); | |
288 | } | |
289 | ||
c66d52b1 LZ |
290 | static void sdei_event_destroy(struct sdei_event *event) |
291 | { | |
292 | spin_lock(&sdei_list_lock); | |
293 | sdei_event_destroy_llocked(event); | |
294 | spin_unlock(&sdei_list_lock); | |
295 | } | |
296 | ||
ad6eb31e JM |
297 | static int sdei_api_get_version(u64 *version) |
298 | { | |
299 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_VERSION, 0, 0, 0, 0, 0, version); | |
300 | } | |
301 | ||
302 | int sdei_mask_local_cpu(void) | |
303 | { | |
304 | int err; | |
305 | ||
ad6eb31e JM |
306 | err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_MASK, 0, 0, 0, 0, 0, NULL); |
307 | if (err && err != -EIO) { | |
308 | pr_warn_once("failed to mask CPU[%u]: %d\n", | |
309 | smp_processor_id(), err); | |
310 | return err; | |
311 | } | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static void _ipi_mask_cpu(void *ignored) | |
317 | { | |
d2c48b23 | 318 | WARN_ON_ONCE(preemptible()); |
ad6eb31e JM |
319 | sdei_mask_local_cpu(); |
320 | } | |
321 | ||
322 | int sdei_unmask_local_cpu(void) | |
323 | { | |
324 | int err; | |
325 | ||
ad6eb31e JM |
326 | err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_UNMASK, 0, 0, 0, 0, 0, NULL); |
327 | if (err && err != -EIO) { | |
328 | pr_warn_once("failed to unmask CPU[%u]: %d\n", | |
329 | smp_processor_id(), err); | |
330 | return err; | |
331 | } | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static void _ipi_unmask_cpu(void *ignored) | |
337 | { | |
d2c48b23 | 338 | WARN_ON_ONCE(preemptible()); |
ad6eb31e JM |
339 | sdei_unmask_local_cpu(); |
340 | } | |
341 | ||
342 | static void _ipi_private_reset(void *ignored) | |
343 | { | |
344 | int err; | |
345 | ||
d2c48b23 PG |
346 | WARN_ON_ONCE(preemptible()); |
347 | ||
ad6eb31e JM |
348 | err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PRIVATE_RESET, 0, 0, 0, 0, 0, |
349 | NULL); | |
350 | if (err && err != -EIO) | |
351 | pr_warn_once("failed to reset CPU[%u]: %d\n", | |
352 | smp_processor_id(), err); | |
353 | } | |
354 | ||
355 | static int sdei_api_shared_reset(void) | |
356 | { | |
357 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_SHARED_RESET, 0, 0, 0, 0, 0, | |
358 | NULL); | |
359 | } | |
360 | ||
361 | static void sdei_mark_interface_broken(void) | |
362 | { | |
363 | pr_err("disabling SDEI firmware interface\n"); | |
364 | on_each_cpu(&_ipi_mask_cpu, NULL, true); | |
365 | sdei_firmware_call = NULL; | |
366 | } | |
367 | ||
368 | static int sdei_platform_reset(void) | |
369 | { | |
370 | int err; | |
371 | ||
372 | on_each_cpu(&_ipi_private_reset, NULL, true); | |
373 | err = sdei_api_shared_reset(); | |
374 | if (err) { | |
375 | pr_err("Failed to reset platform: %d\n", err); | |
376 | sdei_mark_interface_broken(); | |
377 | } | |
378 | ||
379 | return err; | |
380 | } | |
381 | ||
382 | static int sdei_api_event_enable(u32 event_num) | |
383 | { | |
384 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_ENABLE, event_num, 0, 0, 0, | |
385 | 0, NULL); | |
386 | } | |
387 | ||
f92b5462 JM |
388 | /* Called directly by the hotplug callbacks */ |
389 | static void _local_event_enable(void *data) | |
390 | { | |
391 | int err; | |
392 | struct sdei_crosscall_args *arg = data; | |
393 | ||
f92b5462 JM |
394 | err = sdei_api_event_enable(arg->event->event_num); |
395 | ||
396 | sdei_cross_call_return(arg, err); | |
397 | } | |
398 | ||
ad6eb31e JM |
399 | int sdei_event_enable(u32 event_num) |
400 | { | |
401 | int err = -EINVAL; | |
402 | struct sdei_event *event; | |
403 | ||
404 | mutex_lock(&sdei_events_lock); | |
405 | event = sdei_event_find(event_num); | |
406 | if (!event) { | |
407 | mutex_unlock(&sdei_events_lock); | |
408 | return -ENOENT; | |
409 | } | |
410 | ||
da351827 | 411 | |
54f529a6 | 412 | cpus_read_lock(); |
ad6eb31e JM |
413 | if (event->type == SDEI_EVENT_TYPE_SHARED) |
414 | err = sdei_api_event_enable(event->event_num); | |
f92b5462 JM |
415 | else |
416 | err = sdei_do_cross_call(_local_event_enable, event); | |
54f529a6 JM |
417 | |
418 | if (!err) { | |
419 | spin_lock(&sdei_list_lock); | |
420 | event->reenable = true; | |
421 | spin_unlock(&sdei_list_lock); | |
422 | } | |
423 | cpus_read_unlock(); | |
ad6eb31e JM |
424 | mutex_unlock(&sdei_events_lock); |
425 | ||
426 | return err; | |
427 | } | |
ad6eb31e JM |
428 | |
429 | static int sdei_api_event_disable(u32 event_num) | |
430 | { | |
431 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_DISABLE, event_num, 0, 0, | |
432 | 0, 0, NULL); | |
433 | } | |
434 | ||
f92b5462 JM |
435 | static void _ipi_event_disable(void *data) |
436 | { | |
437 | int err; | |
438 | struct sdei_crosscall_args *arg = data; | |
439 | ||
440 | err = sdei_api_event_disable(arg->event->event_num); | |
441 | ||
442 | sdei_cross_call_return(arg, err); | |
443 | } | |
444 | ||
ad6eb31e JM |
445 | int sdei_event_disable(u32 event_num) |
446 | { | |
447 | int err = -EINVAL; | |
448 | struct sdei_event *event; | |
449 | ||
450 | mutex_lock(&sdei_events_lock); | |
451 | event = sdei_event_find(event_num); | |
452 | if (!event) { | |
453 | mutex_unlock(&sdei_events_lock); | |
454 | return -ENOENT; | |
455 | } | |
456 | ||
da351827 JM |
457 | spin_lock(&sdei_list_lock); |
458 | event->reenable = false; | |
459 | spin_unlock(&sdei_list_lock); | |
460 | ||
ad6eb31e JM |
461 | if (event->type == SDEI_EVENT_TYPE_SHARED) |
462 | err = sdei_api_event_disable(event->event_num); | |
f92b5462 JM |
463 | else |
464 | err = sdei_do_cross_call(_ipi_event_disable, event); | |
ad6eb31e JM |
465 | mutex_unlock(&sdei_events_lock); |
466 | ||
467 | return err; | |
468 | } | |
ad6eb31e JM |
469 | |
470 | static int sdei_api_event_unregister(u32 event_num) | |
471 | { | |
472 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_UNREGISTER, event_num, 0, | |
473 | 0, 0, 0, NULL); | |
474 | } | |
475 | ||
f92b5462 JM |
476 | /* Called directly by the hotplug callbacks */ |
477 | static void _local_event_unregister(void *data) | |
478 | { | |
479 | int err; | |
480 | struct sdei_crosscall_args *arg = data; | |
481 | ||
f92b5462 JM |
482 | err = sdei_api_event_unregister(arg->event->event_num); |
483 | ||
484 | sdei_cross_call_return(arg, err); | |
485 | } | |
486 | ||
ad6eb31e JM |
487 | int sdei_event_unregister(u32 event_num) |
488 | { | |
489 | int err; | |
490 | struct sdei_event *event; | |
491 | ||
492 | WARN_ON(in_nmi()); | |
493 | ||
494 | mutex_lock(&sdei_events_lock); | |
495 | event = sdei_event_find(event_num); | |
b06146b6 GS |
496 | if (!event) { |
497 | pr_warn("Event %u not registered\n", event_num); | |
498 | err = -ENOENT; | |
499 | goto unlock; | |
500 | } | |
ad6eb31e | 501 | |
b06146b6 GS |
502 | spin_lock(&sdei_list_lock); |
503 | event->reregister = false; | |
504 | event->reenable = false; | |
505 | spin_unlock(&sdei_list_lock); | |
6ded0b61 | 506 | |
4b2b76cb GS |
507 | if (event->type == SDEI_EVENT_TYPE_SHARED) |
508 | err = sdei_api_event_unregister(event->event_num); | |
509 | else | |
510 | err = sdei_do_cross_call(_local_event_unregister, event); | |
511 | ||
b06146b6 GS |
512 | if (err) |
513 | goto unlock; | |
ad6eb31e | 514 | |
b06146b6 GS |
515 | sdei_event_destroy(event); |
516 | unlock: | |
ad6eb31e JM |
517 | mutex_unlock(&sdei_events_lock); |
518 | ||
519 | return err; | |
520 | } | |
ad6eb31e | 521 | |
da351827 JM |
522 | /* |
523 | * unregister events, but don't destroy them as they are re-registered by | |
524 | * sdei_reregister_shared(). | |
525 | */ | |
526 | static int sdei_unregister_shared(void) | |
527 | { | |
528 | int err = 0; | |
529 | struct sdei_event *event; | |
530 | ||
531 | mutex_lock(&sdei_events_lock); | |
532 | spin_lock(&sdei_list_lock); | |
533 | list_for_each_entry(event, &sdei_list, list) { | |
534 | if (event->type != SDEI_EVENT_TYPE_SHARED) | |
535 | continue; | |
536 | ||
4b2b76cb | 537 | err = sdei_api_event_unregister(event->event_num); |
da351827 JM |
538 | if (err) |
539 | break; | |
540 | } | |
541 | spin_unlock(&sdei_list_lock); | |
542 | mutex_unlock(&sdei_events_lock); | |
543 | ||
544 | return err; | |
545 | } | |
546 | ||
ad6eb31e JM |
547 | static int sdei_api_event_register(u32 event_num, unsigned long entry_point, |
548 | void *arg, u64 flags, u64 affinity) | |
549 | { | |
550 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_REGISTER, event_num, | |
551 | (unsigned long)entry_point, (unsigned long)arg, | |
552 | flags, affinity, NULL); | |
553 | } | |
554 | ||
f92b5462 JM |
555 | /* Called directly by the hotplug callbacks */ |
556 | static void _local_event_register(void *data) | |
557 | { | |
558 | int err; | |
559 | struct sdei_registered_event *reg; | |
560 | struct sdei_crosscall_args *arg = data; | |
561 | ||
f92b5462 JM |
562 | reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id()); |
563 | err = sdei_api_event_register(arg->event->event_num, sdei_entry_point, | |
564 | reg, 0, 0); | |
565 | ||
566 | sdei_cross_call_return(arg, err); | |
567 | } | |
568 | ||
ad6eb31e JM |
569 | int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg) |
570 | { | |
571 | int err; | |
572 | struct sdei_event *event; | |
573 | ||
574 | WARN_ON(in_nmi()); | |
575 | ||
576 | mutex_lock(&sdei_events_lock); | |
1bbc7551 GS |
577 | if (sdei_event_find(event_num)) { |
578 | pr_warn("Event %u already registered\n", event_num); | |
579 | err = -EBUSY; | |
580 | goto unlock; | |
581 | } | |
ad6eb31e | 582 | |
1bbc7551 GS |
583 | event = sdei_event_create(event_num, cb, arg); |
584 | if (IS_ERR(event)) { | |
585 | err = PTR_ERR(event); | |
586 | pr_warn("Failed to create event %u: %d\n", event_num, err); | |
587 | goto unlock; | |
588 | } | |
ad6eb31e | 589 | |
1bbc7551 | 590 | cpus_read_lock(); |
d2fc580d GS |
591 | if (event->type == SDEI_EVENT_TYPE_SHARED) { |
592 | err = sdei_api_event_register(event->event_num, | |
593 | sdei_entry_point, | |
594 | event->registered, | |
595 | SDEI_EVENT_REGISTER_RM_ANY, 0); | |
596 | } else { | |
597 | err = sdei_do_cross_call(_local_event_register, event); | |
598 | if (err) | |
599 | sdei_do_cross_call(_local_event_unregister, event); | |
600 | } | |
601 | ||
1bbc7551 GS |
602 | if (err) { |
603 | sdei_event_destroy(event); | |
604 | pr_warn("Failed to register event %u: %d\n", event_num, err); | |
605 | goto cpu_unlock; | |
606 | } | |
ad6eb31e | 607 | |
1bbc7551 GS |
608 | spin_lock(&sdei_list_lock); |
609 | event->reregister = true; | |
610 | spin_unlock(&sdei_list_lock); | |
611 | cpu_unlock: | |
612 | cpus_read_unlock(); | |
613 | unlock: | |
614 | mutex_unlock(&sdei_events_lock); | |
ad6eb31e JM |
615 | return err; |
616 | } | |
ad6eb31e | 617 | |
da351827 JM |
618 | static int sdei_reregister_shared(void) |
619 | { | |
620 | int err = 0; | |
621 | struct sdei_event *event; | |
622 | ||
623 | mutex_lock(&sdei_events_lock); | |
624 | spin_lock(&sdei_list_lock); | |
625 | list_for_each_entry(event, &sdei_list, list) { | |
626 | if (event->type != SDEI_EVENT_TYPE_SHARED) | |
627 | continue; | |
628 | ||
629 | if (event->reregister) { | |
d2fc580d GS |
630 | err = sdei_api_event_register(event->event_num, |
631 | sdei_entry_point, event->registered, | |
632 | SDEI_EVENT_REGISTER_RM_ANY, 0); | |
633 | if (err) { | |
634 | pr_err("Failed to re-register event %u\n", | |
635 | event->event_num); | |
636 | sdei_event_destroy_llocked(event); | |
637 | break; | |
638 | } | |
639 | } | |
640 | ||
641 | if (event->reenable) { | |
642 | err = sdei_api_event_enable(event->event_num); | |
643 | if (err) { | |
644 | pr_err("Failed to re-enable event %u\n", | |
645 | event->event_num); | |
da351827 | 646 | break; |
d2fc580d | 647 | } |
da351827 JM |
648 | } |
649 | } | |
650 | spin_unlock(&sdei_list_lock); | |
651 | mutex_unlock(&sdei_events_lock); | |
652 | ||
653 | return err; | |
654 | } | |
655 | ||
f92b5462 JM |
656 | static int sdei_cpuhp_down(unsigned int cpu) |
657 | { | |
658 | struct sdei_event *event; | |
f4673625 | 659 | int err; |
f92b5462 JM |
660 | |
661 | /* un-register private events */ | |
662 | spin_lock(&sdei_list_lock); | |
663 | list_for_each_entry(event, &sdei_list, list) { | |
664 | if (event->type == SDEI_EVENT_TYPE_SHARED) | |
665 | continue; | |
666 | ||
f4673625 GS |
667 | err = sdei_do_local_call(_local_event_unregister, event); |
668 | if (err) { | |
f92b5462 | 669 | pr_err("Failed to unregister event %u: %d\n", |
f4673625 GS |
670 | event->event_num, err); |
671 | } | |
f92b5462 JM |
672 | } |
673 | spin_unlock(&sdei_list_lock); | |
674 | ||
675 | return sdei_mask_local_cpu(); | |
676 | } | |
677 | ||
678 | static int sdei_cpuhp_up(unsigned int cpu) | |
679 | { | |
680 | struct sdei_event *event; | |
f4673625 | 681 | int err; |
f92b5462 JM |
682 | |
683 | /* re-register/enable private events */ | |
684 | spin_lock(&sdei_list_lock); | |
685 | list_for_each_entry(event, &sdei_list, list) { | |
686 | if (event->type == SDEI_EVENT_TYPE_SHARED) | |
687 | continue; | |
688 | ||
689 | if (event->reregister) { | |
f4673625 GS |
690 | err = sdei_do_local_call(_local_event_register, event); |
691 | if (err) { | |
f92b5462 | 692 | pr_err("Failed to re-register event %u: %d\n", |
f4673625 GS |
693 | event->event_num, err); |
694 | } | |
f92b5462 JM |
695 | } |
696 | ||
697 | if (event->reenable) { | |
f4673625 GS |
698 | err = sdei_do_local_call(_local_event_enable, event); |
699 | if (err) { | |
f92b5462 | 700 | pr_err("Failed to re-enable event %u: %d\n", |
f4673625 GS |
701 | event->event_num, err); |
702 | } | |
f92b5462 JM |
703 | } |
704 | } | |
705 | spin_unlock(&sdei_list_lock); | |
706 | ||
707 | return sdei_unmask_local_cpu(); | |
708 | } | |
709 | ||
da351827 JM |
710 | /* When entering idle, mask/unmask events for this cpu */ |
711 | static int sdei_pm_notifier(struct notifier_block *nb, unsigned long action, | |
712 | void *data) | |
713 | { | |
714 | int rv; | |
715 | ||
d2c48b23 PG |
716 | WARN_ON_ONCE(preemptible()); |
717 | ||
da351827 JM |
718 | switch (action) { |
719 | case CPU_PM_ENTER: | |
720 | rv = sdei_mask_local_cpu(); | |
721 | break; | |
722 | case CPU_PM_EXIT: | |
723 | case CPU_PM_ENTER_FAILED: | |
724 | rv = sdei_unmask_local_cpu(); | |
725 | break; | |
726 | default: | |
727 | return NOTIFY_DONE; | |
728 | } | |
729 | ||
730 | if (rv) | |
731 | return notifier_from_errno(rv); | |
732 | ||
733 | return NOTIFY_OK; | |
734 | } | |
735 | ||
736 | static struct notifier_block sdei_pm_nb = { | |
737 | .notifier_call = sdei_pm_notifier, | |
738 | }; | |
739 | ||
740 | static int sdei_device_suspend(struct device *dev) | |
741 | { | |
742 | on_each_cpu(_ipi_mask_cpu, NULL, true); | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | static int sdei_device_resume(struct device *dev) | |
748 | { | |
749 | on_each_cpu(_ipi_unmask_cpu, NULL, true); | |
750 | ||
751 | return 0; | |
752 | } | |
753 | ||
754 | /* | |
755 | * We need all events to be reregistered when we resume from hibernate. | |
756 | * | |
757 | * The sequence is freeze->thaw. Reboot. freeze->restore. We unregister | |
758 | * events during freeze, then re-register and re-enable them during thaw | |
759 | * and restore. | |
760 | */ | |
761 | static int sdei_device_freeze(struct device *dev) | |
762 | { | |
763 | int err; | |
764 | ||
f92b5462 | 765 | /* unregister private events */ |
d2c48b23 | 766 | cpuhp_remove_state(sdei_entry_point); |
da351827 JM |
767 | |
768 | err = sdei_unregister_shared(); | |
769 | if (err) | |
770 | return err; | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
775 | static int sdei_device_thaw(struct device *dev) | |
776 | { | |
777 | int err; | |
778 | ||
779 | /* re-register shared events */ | |
780 | err = sdei_reregister_shared(); | |
781 | if (err) { | |
782 | pr_warn("Failed to re-register shared events...\n"); | |
783 | sdei_mark_interface_broken(); | |
784 | return err; | |
785 | } | |
786 | ||
d2c48b23 | 787 | err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "SDEI", |
da351827 | 788 | &sdei_cpuhp_up, &sdei_cpuhp_down); |
d2c48b23 | 789 | if (err < 0) { |
da351827 | 790 | pr_warn("Failed to re-register CPU hotplug notifier...\n"); |
d2c48b23 PG |
791 | return err; |
792 | } | |
da351827 | 793 | |
d2c48b23 PG |
794 | sdei_hp_state = err; |
795 | return 0; | |
da351827 JM |
796 | } |
797 | ||
798 | static int sdei_device_restore(struct device *dev) | |
799 | { | |
800 | int err; | |
801 | ||
802 | err = sdei_platform_reset(); | |
803 | if (err) | |
804 | return err; | |
805 | ||
806 | return sdei_device_thaw(dev); | |
807 | } | |
808 | ||
809 | static const struct dev_pm_ops sdei_pm_ops = { | |
810 | .suspend = sdei_device_suspend, | |
811 | .resume = sdei_device_resume, | |
812 | .freeze = sdei_device_freeze, | |
813 | .thaw = sdei_device_thaw, | |
814 | .restore = sdei_device_restore, | |
815 | }; | |
816 | ||
817 | /* | |
818 | * Mask all CPUs and unregister all events on panic, reboot or kexec. | |
819 | */ | |
820 | static int sdei_reboot_notifier(struct notifier_block *nb, unsigned long action, | |
821 | void *data) | |
822 | { | |
823 | /* | |
824 | * We are going to reset the interface, after this there is no point | |
825 | * doing work when we take CPUs offline. | |
826 | */ | |
d2c48b23 | 827 | cpuhp_remove_state(sdei_hp_state); |
da351827 JM |
828 | |
829 | sdei_platform_reset(); | |
830 | ||
831 | return NOTIFY_OK; | |
832 | } | |
833 | ||
834 | static struct notifier_block sdei_reboot_nb = { | |
835 | .notifier_call = sdei_reboot_notifier, | |
836 | }; | |
837 | ||
ad6eb31e JM |
838 | static void sdei_smccc_smc(unsigned long function_id, |
839 | unsigned long arg0, unsigned long arg1, | |
840 | unsigned long arg2, unsigned long arg3, | |
841 | unsigned long arg4, struct arm_smccc_res *res) | |
842 | { | |
843 | arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res); | |
844 | } | |
2f1d4e24 | 845 | NOKPROBE_SYMBOL(sdei_smccc_smc); |
ad6eb31e JM |
846 | |
847 | static void sdei_smccc_hvc(unsigned long function_id, | |
848 | unsigned long arg0, unsigned long arg1, | |
849 | unsigned long arg2, unsigned long arg3, | |
850 | unsigned long arg4, struct arm_smccc_res *res) | |
851 | { | |
852 | arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res); | |
853 | } | |
2f1d4e24 | 854 | NOKPROBE_SYMBOL(sdei_smccc_hvc); |
ad6eb31e | 855 | |
f96935d3 JM |
856 | int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb, |
857 | sdei_event_callback *critical_cb) | |
858 | { | |
859 | int err; | |
860 | u64 result; | |
861 | u32 event_num; | |
862 | sdei_event_callback *cb; | |
863 | ||
864 | if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES)) | |
865 | return -EOPNOTSUPP; | |
866 | ||
867 | event_num = ghes->generic->notify.vector; | |
868 | if (event_num == 0) { | |
869 | /* | |
870 | * Event 0 is reserved by the specification for | |
871 | * SDEI_EVENT_SIGNAL. | |
872 | */ | |
873 | return -EINVAL; | |
874 | } | |
875 | ||
876 | err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY, | |
877 | &result); | |
878 | if (err) | |
879 | return err; | |
880 | ||
881 | if (result == SDEI_EVENT_PRIORITY_CRITICAL) | |
882 | cb = critical_cb; | |
883 | else | |
884 | cb = normal_cb; | |
885 | ||
886 | err = sdei_event_register(event_num, cb, ghes); | |
887 | if (!err) | |
888 | err = sdei_event_enable(event_num); | |
889 | ||
890 | return err; | |
891 | } | |
892 | ||
893 | int sdei_unregister_ghes(struct ghes *ghes) | |
894 | { | |
895 | int i; | |
896 | int err; | |
897 | u32 event_num = ghes->generic->notify.vector; | |
898 | ||
899 | might_sleep(); | |
900 | ||
901 | if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES)) | |
902 | return -EOPNOTSUPP; | |
903 | ||
904 | /* | |
905 | * The event may be running on another CPU. Disable it | |
906 | * to stop new events, then try to unregister a few times. | |
907 | */ | |
908 | err = sdei_event_disable(event_num); | |
909 | if (err) | |
910 | return err; | |
911 | ||
912 | for (i = 0; i < 3; i++) { | |
913 | err = sdei_event_unregister(event_num); | |
914 | if (err != -EINPROGRESS) | |
915 | break; | |
916 | ||
917 | schedule(); | |
918 | } | |
919 | ||
920 | return err; | |
921 | } | |
922 | ||
ad6eb31e JM |
923 | static int sdei_get_conduit(struct platform_device *pdev) |
924 | { | |
925 | const char *method; | |
926 | struct device_node *np = pdev->dev.of_node; | |
927 | ||
928 | sdei_firmware_call = NULL; | |
929 | if (np) { | |
930 | if (of_property_read_string(np, "method", &method)) { | |
931 | pr_warn("missing \"method\" property\n"); | |
e6ea4651 | 932 | return SMCCC_CONDUIT_NONE; |
ad6eb31e JM |
933 | } |
934 | ||
935 | if (!strcmp("hvc", method)) { | |
936 | sdei_firmware_call = &sdei_smccc_hvc; | |
e6ea4651 | 937 | return SMCCC_CONDUIT_HVC; |
ad6eb31e JM |
938 | } else if (!strcmp("smc", method)) { |
939 | sdei_firmware_call = &sdei_smccc_smc; | |
e6ea4651 | 940 | return SMCCC_CONDUIT_SMC; |
ad6eb31e JM |
941 | } |
942 | ||
943 | pr_warn("invalid \"method\" property: %s\n", method); | |
bc110fd3 | 944 | } else if (!acpi_disabled) { |
677a60bd JM |
945 | if (acpi_psci_use_hvc()) { |
946 | sdei_firmware_call = &sdei_smccc_hvc; | |
e6ea4651 | 947 | return SMCCC_CONDUIT_HVC; |
677a60bd JM |
948 | } else { |
949 | sdei_firmware_call = &sdei_smccc_smc; | |
e6ea4651 | 950 | return SMCCC_CONDUIT_SMC; |
677a60bd | 951 | } |
ad6eb31e JM |
952 | } |
953 | ||
e6ea4651 | 954 | return SMCCC_CONDUIT_NONE; |
ad6eb31e JM |
955 | } |
956 | ||
957 | static int sdei_probe(struct platform_device *pdev) | |
958 | { | |
959 | int err; | |
960 | u64 ver = 0; | |
961 | int conduit; | |
962 | ||
963 | conduit = sdei_get_conduit(pdev); | |
964 | if (!sdei_firmware_call) | |
965 | return 0; | |
966 | ||
967 | err = sdei_api_get_version(&ver); | |
ad6eb31e JM |
968 | if (err) { |
969 | pr_err("Failed to get SDEI version: %d\n", err); | |
970 | sdei_mark_interface_broken(); | |
971 | return err; | |
972 | } | |
973 | ||
974 | pr_info("SDEIv%d.%d (0x%x) detected in firmware.\n", | |
975 | (int)SDEI_VERSION_MAJOR(ver), (int)SDEI_VERSION_MINOR(ver), | |
976 | (int)SDEI_VERSION_VENDOR(ver)); | |
977 | ||
978 | if (SDEI_VERSION_MAJOR(ver) != 1) { | |
979 | pr_warn("Conflicting SDEI version detected.\n"); | |
980 | sdei_mark_interface_broken(); | |
981 | return -EINVAL; | |
982 | } | |
983 | ||
984 | err = sdei_platform_reset(); | |
985 | if (err) | |
986 | return err; | |
987 | ||
988 | sdei_entry_point = sdei_arch_get_entry_point(conduit); | |
989 | if (!sdei_entry_point) { | |
990 | /* Not supported due to hardware or boot configuration */ | |
991 | sdei_mark_interface_broken(); | |
992 | return 0; | |
993 | } | |
994 | ||
da351827 JM |
995 | err = cpu_pm_register_notifier(&sdei_pm_nb); |
996 | if (err) { | |
997 | pr_warn("Failed to register CPU PM notifier...\n"); | |
998 | goto error; | |
999 | } | |
1000 | ||
1001 | err = register_reboot_notifier(&sdei_reboot_nb); | |
1002 | if (err) { | |
1003 | pr_warn("Failed to register reboot notifier...\n"); | |
1004 | goto remove_cpupm; | |
1005 | } | |
1006 | ||
d2c48b23 | 1007 | err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "SDEI", |
da351827 | 1008 | &sdei_cpuhp_up, &sdei_cpuhp_down); |
d2c48b23 | 1009 | if (err < 0) { |
da351827 JM |
1010 | pr_warn("Failed to register CPU hotplug notifier...\n"); |
1011 | goto remove_reboot; | |
1012 | } | |
ad6eb31e | 1013 | |
d2c48b23 PG |
1014 | sdei_hp_state = err; |
1015 | ||
ad6eb31e | 1016 | return 0; |
da351827 JM |
1017 | |
1018 | remove_reboot: | |
1019 | unregister_reboot_notifier(&sdei_reboot_nb); | |
1020 | ||
1021 | remove_cpupm: | |
1022 | cpu_pm_unregister_notifier(&sdei_pm_nb); | |
1023 | ||
1024 | error: | |
1025 | sdei_mark_interface_broken(); | |
1026 | return err; | |
ad6eb31e JM |
1027 | } |
1028 | ||
1029 | static const struct of_device_id sdei_of_match[] = { | |
1030 | { .compatible = "arm,sdei-1.0" }, | |
1031 | {} | |
1032 | }; | |
1033 | ||
1034 | static struct platform_driver sdei_driver = { | |
1035 | .driver = { | |
1036 | .name = "sdei", | |
da351827 | 1037 | .pm = &sdei_pm_ops, |
ad6eb31e JM |
1038 | .of_match_table = sdei_of_match, |
1039 | }, | |
1040 | .probe = sdei_probe, | |
1041 | }; | |
1042 | ||
677a60bd JM |
1043 | static bool __init sdei_present_acpi(void) |
1044 | { | |
1045 | acpi_status status; | |
677a60bd JM |
1046 | struct acpi_table_header *sdei_table_header; |
1047 | ||
1048 | if (acpi_disabled) | |
1049 | return false; | |
1050 | ||
1051 | status = acpi_get_table(ACPI_SIG_SDEI, 0, &sdei_table_header); | |
1052 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
1053 | const char *msg = acpi_format_exception(status); | |
1054 | ||
1055 | pr_info("Failed to get ACPI:SDEI table, %s\n", msg); | |
1056 | } | |
1057 | if (ACPI_FAILURE(status)) | |
1058 | return false; | |
1059 | ||
70e6352a HG |
1060 | acpi_put_table(sdei_table_header); |
1061 | ||
677a60bd JM |
1062 | return true; |
1063 | } | |
1064 | ||
dc4e8c07 | 1065 | void __init sdei_init(void) |
ad6eb31e | 1066 | { |
10fd7c42 GS |
1067 | struct platform_device *pdev; |
1068 | int ret; | |
1069 | ||
1070 | ret = platform_driver_register(&sdei_driver); | |
1071 | if (ret || !sdei_present_acpi()) | |
dc4e8c07 | 1072 | return; |
10fd7c42 GS |
1073 | |
1074 | pdev = platform_device_register_simple(sdei_driver.driver.name, | |
1075 | 0, NULL, 0); | |
63627cae GS |
1076 | if (IS_ERR(pdev)) { |
1077 | ret = PTR_ERR(pdev); | |
1078 | platform_driver_unregister(&sdei_driver); | |
1079 | pr_info("Failed to register ACPI:SDEI platform device %d\n", | |
1080 | ret); | |
1081 | } | |
ad6eb31e JM |
1082 | } |
1083 | ||
ad6eb31e JM |
1084 | int sdei_event_handler(struct pt_regs *regs, |
1085 | struct sdei_registered_event *arg) | |
1086 | { | |
1087 | int err; | |
ad6eb31e JM |
1088 | u32 event_num = arg->event_num; |
1089 | ||
ad6eb31e JM |
1090 | err = arg->callback(event_num, regs, arg->callback_arg); |
1091 | if (err) | |
1092 | pr_err_ratelimited("event %u on CPU %u failed with error: %d\n", | |
1093 | event_num, smp_processor_id(), err); | |
1094 | ||
ad6eb31e JM |
1095 | return err; |
1096 | } | |
1097 | NOKPROBE_SYMBOL(sdei_event_handler); | |
5cd474e5 SP |
1098 | |
1099 | void sdei_handler_abort(void) | |
1100 | { | |
1101 | /* | |
1102 | * If the crash happened in an SDEI event handler then we need to | |
1103 | * finish the handler with the firmware so that we can have working | |
1104 | * interrupts in the crash kernel. | |
1105 | */ | |
1106 | if (__this_cpu_read(sdei_active_critical_event)) { | |
1107 | pr_warn("still in SDEI critical event context, attempting to finish handler.\n"); | |
1108 | __sdei_handler_abort(); | |
1109 | __this_cpu_write(sdei_active_critical_event, NULL); | |
1110 | } | |
1111 | if (__this_cpu_read(sdei_active_normal_event)) { | |
1112 | pr_warn("still in SDEI normal event context, attempting to finish handler.\n"); | |
1113 | __sdei_handler_abort(); | |
1114 | __this_cpu_write(sdei_active_normal_event, NULL); | |
1115 | } | |
1116 | } |