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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 | ||
46 | struct sdei_event { | |
da351827 | 47 | /* These three are protected by the sdei_list_lock */ |
ad6eb31e | 48 | struct list_head list; |
da351827 JM |
49 | bool reregister; |
50 | bool reenable; | |
51 | ||
ad6eb31e JM |
52 | u32 event_num; |
53 | u8 type; | |
54 | u8 priority; | |
55 | ||
56 | /* This pointer is handed to firmware as the event argument. */ | |
f92b5462 JM |
57 | union { |
58 | /* Shared events */ | |
59 | struct sdei_registered_event *registered; | |
60 | ||
61 | /* CPU private events */ | |
62 | struct sdei_registered_event __percpu *private_registered; | |
63 | }; | |
ad6eb31e JM |
64 | }; |
65 | ||
66 | /* Take the mutex for any API call or modification. Take the mutex first. */ | |
67 | static DEFINE_MUTEX(sdei_events_lock); | |
68 | ||
69 | /* and then hold this when modifying the list */ | |
70 | static DEFINE_SPINLOCK(sdei_list_lock); | |
71 | static LIST_HEAD(sdei_list); | |
72 | ||
f92b5462 JM |
73 | /* Private events are registered/enabled via IPI passing one of these */ |
74 | struct sdei_crosscall_args { | |
75 | struct sdei_event *event; | |
76 | atomic_t errors; | |
77 | int first_error; | |
78 | }; | |
79 | ||
a27c04e1 GS |
80 | #define CROSSCALL_INIT(arg, event) \ |
81 | do { \ | |
82 | arg.event = event; \ | |
83 | arg.first_error = 0; \ | |
84 | atomic_set(&arg.errors, 0); \ | |
85 | } while (0) | |
f92b5462 | 86 | |
f4673625 GS |
87 | static inline int sdei_do_local_call(smp_call_func_t fn, |
88 | struct sdei_event *event) | |
89 | { | |
90 | struct sdei_crosscall_args arg; | |
91 | ||
92 | CROSSCALL_INIT(arg, event); | |
93 | fn(&arg); | |
94 | ||
95 | return arg.first_error; | |
96 | } | |
97 | ||
a27c04e1 GS |
98 | static inline int sdei_do_cross_call(smp_call_func_t fn, |
99 | struct sdei_event *event) | |
f92b5462 JM |
100 | { |
101 | struct sdei_crosscall_args arg; | |
102 | ||
103 | CROSSCALL_INIT(arg, event); | |
104 | on_each_cpu(fn, &arg, true); | |
105 | ||
106 | return arg.first_error; | |
107 | } | |
108 | ||
109 | static inline void | |
110 | sdei_cross_call_return(struct sdei_crosscall_args *arg, int err) | |
111 | { | |
112 | if (err && (atomic_inc_return(&arg->errors) == 1)) | |
113 | arg->first_error = err; | |
114 | } | |
115 | ||
ad6eb31e JM |
116 | static int sdei_to_linux_errno(unsigned long sdei_err) |
117 | { | |
118 | switch (sdei_err) { | |
119 | case SDEI_NOT_SUPPORTED: | |
120 | return -EOPNOTSUPP; | |
121 | case SDEI_INVALID_PARAMETERS: | |
122 | return -EINVAL; | |
123 | case SDEI_DENIED: | |
124 | return -EPERM; | |
125 | case SDEI_PENDING: | |
126 | return -EINPROGRESS; | |
127 | case SDEI_OUT_OF_RESOURCE: | |
128 | return -ENOMEM; | |
129 | } | |
130 | ||
5735f515 | 131 | return 0; |
ad6eb31e JM |
132 | } |
133 | ||
134 | static int invoke_sdei_fn(unsigned long function_id, unsigned long arg0, | |
135 | unsigned long arg1, unsigned long arg2, | |
136 | unsigned long arg3, unsigned long arg4, | |
137 | u64 *result) | |
138 | { | |
5735f515 | 139 | int err; |
ad6eb31e JM |
140 | struct arm_smccc_res res; |
141 | ||
142 | if (sdei_firmware_call) { | |
143 | sdei_firmware_call(function_id, arg0, arg1, arg2, arg3, arg4, | |
144 | &res); | |
5735f515 | 145 | err = sdei_to_linux_errno(res.a0); |
ad6eb31e JM |
146 | } else { |
147 | /* | |
148 | * !sdei_firmware_call means we failed to probe or called | |
149 | * sdei_mark_interface_broken(). -EIO is not an error returned | |
150 | * by sdei_to_linux_errno() and is used to suppress messages | |
151 | * from this driver. | |
152 | */ | |
153 | err = -EIO; | |
154 | res.a0 = SDEI_NOT_SUPPORTED; | |
155 | } | |
156 | ||
157 | if (result) | |
158 | *result = res.a0; | |
159 | ||
160 | return err; | |
161 | } | |
2f1d4e24 | 162 | NOKPROBE_SYMBOL(invoke_sdei_fn); |
ad6eb31e JM |
163 | |
164 | static struct sdei_event *sdei_event_find(u32 event_num) | |
165 | { | |
166 | struct sdei_event *e, *found = NULL; | |
167 | ||
168 | lockdep_assert_held(&sdei_events_lock); | |
169 | ||
170 | spin_lock(&sdei_list_lock); | |
171 | list_for_each_entry(e, &sdei_list, list) { | |
172 | if (e->event_num == event_num) { | |
173 | found = e; | |
174 | break; | |
175 | } | |
176 | } | |
177 | spin_unlock(&sdei_list_lock); | |
178 | ||
179 | return found; | |
180 | } | |
181 | ||
182 | int sdei_api_event_context(u32 query, u64 *result) | |
183 | { | |
184 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_CONTEXT, query, 0, 0, 0, 0, | |
185 | result); | |
186 | } | |
187 | NOKPROBE_SYMBOL(sdei_api_event_context); | |
188 | ||
189 | static int sdei_api_event_get_info(u32 event, u32 info, u64 *result) | |
190 | { | |
191 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_GET_INFO, event, info, 0, | |
192 | 0, 0, result); | |
193 | } | |
194 | ||
195 | static struct sdei_event *sdei_event_create(u32 event_num, | |
196 | sdei_event_callback *cb, | |
197 | void *cb_arg) | |
198 | { | |
199 | int err; | |
200 | u64 result; | |
201 | struct sdei_event *event; | |
202 | struct sdei_registered_event *reg; | |
203 | ||
204 | lockdep_assert_held(&sdei_events_lock); | |
205 | ||
206 | event = kzalloc(sizeof(*event), GFP_KERNEL); | |
11988424 GS |
207 | if (!event) { |
208 | err = -ENOMEM; | |
209 | goto fail; | |
210 | } | |
ad6eb31e JM |
211 | |
212 | INIT_LIST_HEAD(&event->list); | |
213 | event->event_num = event_num; | |
214 | ||
215 | err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY, | |
216 | &result); | |
11988424 GS |
217 | if (err) |
218 | goto fail; | |
ad6eb31e JM |
219 | event->priority = result; |
220 | ||
221 | err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_TYPE, | |
222 | &result); | |
11988424 GS |
223 | if (err) |
224 | goto fail; | |
ad6eb31e JM |
225 | event->type = result; |
226 | ||
227 | if (event->type == SDEI_EVENT_TYPE_SHARED) { | |
228 | reg = kzalloc(sizeof(*reg), GFP_KERNEL); | |
229 | if (!reg) { | |
11988424 GS |
230 | err = -ENOMEM; |
231 | goto fail; | |
ad6eb31e JM |
232 | } |
233 | ||
663c0e89 | 234 | reg->event_num = event->event_num; |
ad6eb31e JM |
235 | reg->priority = event->priority; |
236 | ||
237 | reg->callback = cb; | |
238 | reg->callback_arg = cb_arg; | |
239 | event->registered = reg; | |
f92b5462 JM |
240 | } else { |
241 | int cpu; | |
242 | struct sdei_registered_event __percpu *regs; | |
243 | ||
244 | regs = alloc_percpu(struct sdei_registered_event); | |
245 | if (!regs) { | |
11988424 GS |
246 | err = -ENOMEM; |
247 | goto fail; | |
f92b5462 JM |
248 | } |
249 | ||
250 | for_each_possible_cpu(cpu) { | |
251 | reg = per_cpu_ptr(regs, cpu); | |
252 | ||
253 | reg->event_num = event->event_num; | |
254 | reg->priority = event->priority; | |
255 | reg->callback = cb; | |
256 | reg->callback_arg = cb_arg; | |
257 | } | |
258 | ||
259 | event->private_registered = regs; | |
ad6eb31e JM |
260 | } |
261 | ||
f7d5ef0c LZ |
262 | spin_lock(&sdei_list_lock); |
263 | list_add(&event->list, &sdei_list); | |
264 | spin_unlock(&sdei_list_lock); | |
ad6eb31e JM |
265 | |
266 | return event; | |
11988424 GS |
267 | |
268 | fail: | |
269 | kfree(event); | |
270 | return ERR_PTR(err); | |
ad6eb31e JM |
271 | } |
272 | ||
c66d52b1 | 273 | static void sdei_event_destroy_llocked(struct sdei_event *event) |
ad6eb31e JM |
274 | { |
275 | lockdep_assert_held(&sdei_events_lock); | |
c66d52b1 | 276 | lockdep_assert_held(&sdei_list_lock); |
ad6eb31e | 277 | |
ad6eb31e | 278 | list_del(&event->list); |
ad6eb31e JM |
279 | |
280 | if (event->type == SDEI_EVENT_TYPE_SHARED) | |
281 | kfree(event->registered); | |
f92b5462 JM |
282 | else |
283 | free_percpu(event->private_registered); | |
ad6eb31e JM |
284 | |
285 | kfree(event); | |
286 | } | |
287 | ||
c66d52b1 LZ |
288 | static void sdei_event_destroy(struct sdei_event *event) |
289 | { | |
290 | spin_lock(&sdei_list_lock); | |
291 | sdei_event_destroy_llocked(event); | |
292 | spin_unlock(&sdei_list_lock); | |
293 | } | |
294 | ||
ad6eb31e JM |
295 | static int sdei_api_get_version(u64 *version) |
296 | { | |
297 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_VERSION, 0, 0, 0, 0, 0, version); | |
298 | } | |
299 | ||
300 | int sdei_mask_local_cpu(void) | |
301 | { | |
302 | int err; | |
303 | ||
304 | WARN_ON_ONCE(preemptible()); | |
305 | ||
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 | { | |
318 | sdei_mask_local_cpu(); | |
319 | } | |
320 | ||
321 | int sdei_unmask_local_cpu(void) | |
322 | { | |
323 | int err; | |
324 | ||
325 | WARN_ON_ONCE(preemptible()); | |
326 | ||
327 | err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_UNMASK, 0, 0, 0, 0, 0, NULL); | |
328 | if (err && err != -EIO) { | |
329 | pr_warn_once("failed to unmask CPU[%u]: %d\n", | |
330 | smp_processor_id(), err); | |
331 | return err; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static void _ipi_unmask_cpu(void *ignored) | |
338 | { | |
339 | sdei_unmask_local_cpu(); | |
340 | } | |
341 | ||
342 | static void _ipi_private_reset(void *ignored) | |
343 | { | |
344 | int err; | |
345 | ||
346 | err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PRIVATE_RESET, 0, 0, 0, 0, 0, | |
347 | NULL); | |
348 | if (err && err != -EIO) | |
349 | pr_warn_once("failed to reset CPU[%u]: %d\n", | |
350 | smp_processor_id(), err); | |
351 | } | |
352 | ||
353 | static int sdei_api_shared_reset(void) | |
354 | { | |
355 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_SHARED_RESET, 0, 0, 0, 0, 0, | |
356 | NULL); | |
357 | } | |
358 | ||
359 | static void sdei_mark_interface_broken(void) | |
360 | { | |
361 | pr_err("disabling SDEI firmware interface\n"); | |
362 | on_each_cpu(&_ipi_mask_cpu, NULL, true); | |
363 | sdei_firmware_call = NULL; | |
364 | } | |
365 | ||
366 | static int sdei_platform_reset(void) | |
367 | { | |
368 | int err; | |
369 | ||
370 | on_each_cpu(&_ipi_private_reset, NULL, true); | |
371 | err = sdei_api_shared_reset(); | |
372 | if (err) { | |
373 | pr_err("Failed to reset platform: %d\n", err); | |
374 | sdei_mark_interface_broken(); | |
375 | } | |
376 | ||
377 | return err; | |
378 | } | |
379 | ||
380 | static int sdei_api_event_enable(u32 event_num) | |
381 | { | |
382 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_ENABLE, event_num, 0, 0, 0, | |
383 | 0, NULL); | |
384 | } | |
385 | ||
f92b5462 JM |
386 | /* Called directly by the hotplug callbacks */ |
387 | static void _local_event_enable(void *data) | |
388 | { | |
389 | int err; | |
390 | struct sdei_crosscall_args *arg = data; | |
391 | ||
392 | WARN_ON_ONCE(preemptible()); | |
393 | ||
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 | ||
482 | WARN_ON_ONCE(preemptible()); | |
483 | ||
484 | err = sdei_api_event_unregister(arg->event->event_num); | |
485 | ||
486 | sdei_cross_call_return(arg, err); | |
487 | } | |
488 | ||
ad6eb31e JM |
489 | int sdei_event_unregister(u32 event_num) |
490 | { | |
491 | int err; | |
492 | struct sdei_event *event; | |
493 | ||
494 | WARN_ON(in_nmi()); | |
495 | ||
496 | mutex_lock(&sdei_events_lock); | |
497 | event = sdei_event_find(event_num); | |
b06146b6 GS |
498 | if (!event) { |
499 | pr_warn("Event %u not registered\n", event_num); | |
500 | err = -ENOENT; | |
501 | goto unlock; | |
502 | } | |
ad6eb31e | 503 | |
b06146b6 GS |
504 | spin_lock(&sdei_list_lock); |
505 | event->reregister = false; | |
506 | event->reenable = false; | |
507 | spin_unlock(&sdei_list_lock); | |
6ded0b61 | 508 | |
4b2b76cb GS |
509 | if (event->type == SDEI_EVENT_TYPE_SHARED) |
510 | err = sdei_api_event_unregister(event->event_num); | |
511 | else | |
512 | err = sdei_do_cross_call(_local_event_unregister, event); | |
513 | ||
b06146b6 GS |
514 | if (err) |
515 | goto unlock; | |
ad6eb31e | 516 | |
b06146b6 GS |
517 | sdei_event_destroy(event); |
518 | unlock: | |
ad6eb31e JM |
519 | mutex_unlock(&sdei_events_lock); |
520 | ||
521 | return err; | |
522 | } | |
ad6eb31e | 523 | |
da351827 JM |
524 | /* |
525 | * unregister events, but don't destroy them as they are re-registered by | |
526 | * sdei_reregister_shared(). | |
527 | */ | |
528 | static int sdei_unregister_shared(void) | |
529 | { | |
530 | int err = 0; | |
531 | struct sdei_event *event; | |
532 | ||
533 | mutex_lock(&sdei_events_lock); | |
534 | spin_lock(&sdei_list_lock); | |
535 | list_for_each_entry(event, &sdei_list, list) { | |
536 | if (event->type != SDEI_EVENT_TYPE_SHARED) | |
537 | continue; | |
538 | ||
4b2b76cb | 539 | err = sdei_api_event_unregister(event->event_num); |
da351827 JM |
540 | if (err) |
541 | break; | |
542 | } | |
543 | spin_unlock(&sdei_list_lock); | |
544 | mutex_unlock(&sdei_events_lock); | |
545 | ||
546 | return err; | |
547 | } | |
548 | ||
ad6eb31e JM |
549 | static int sdei_api_event_register(u32 event_num, unsigned long entry_point, |
550 | void *arg, u64 flags, u64 affinity) | |
551 | { | |
552 | return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_REGISTER, event_num, | |
553 | (unsigned long)entry_point, (unsigned long)arg, | |
554 | flags, affinity, NULL); | |
555 | } | |
556 | ||
f92b5462 JM |
557 | /* Called directly by the hotplug callbacks */ |
558 | static void _local_event_register(void *data) | |
559 | { | |
560 | int err; | |
561 | struct sdei_registered_event *reg; | |
562 | struct sdei_crosscall_args *arg = data; | |
563 | ||
564 | WARN_ON(preemptible()); | |
565 | ||
566 | reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id()); | |
567 | err = sdei_api_event_register(arg->event->event_num, sdei_entry_point, | |
568 | reg, 0, 0); | |
569 | ||
570 | sdei_cross_call_return(arg, err); | |
571 | } | |
572 | ||
ad6eb31e JM |
573 | int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg) |
574 | { | |
575 | int err; | |
576 | struct sdei_event *event; | |
577 | ||
578 | WARN_ON(in_nmi()); | |
579 | ||
580 | mutex_lock(&sdei_events_lock); | |
1bbc7551 GS |
581 | if (sdei_event_find(event_num)) { |
582 | pr_warn("Event %u already registered\n", event_num); | |
583 | err = -EBUSY; | |
584 | goto unlock; | |
585 | } | |
ad6eb31e | 586 | |
1bbc7551 GS |
587 | event = sdei_event_create(event_num, cb, arg); |
588 | if (IS_ERR(event)) { | |
589 | err = PTR_ERR(event); | |
590 | pr_warn("Failed to create event %u: %d\n", event_num, err); | |
591 | goto unlock; | |
592 | } | |
ad6eb31e | 593 | |
1bbc7551 | 594 | cpus_read_lock(); |
d2fc580d GS |
595 | if (event->type == SDEI_EVENT_TYPE_SHARED) { |
596 | err = sdei_api_event_register(event->event_num, | |
597 | sdei_entry_point, | |
598 | event->registered, | |
599 | SDEI_EVENT_REGISTER_RM_ANY, 0); | |
600 | } else { | |
601 | err = sdei_do_cross_call(_local_event_register, event); | |
602 | if (err) | |
603 | sdei_do_cross_call(_local_event_unregister, event); | |
604 | } | |
605 | ||
1bbc7551 GS |
606 | if (err) { |
607 | sdei_event_destroy(event); | |
608 | pr_warn("Failed to register event %u: %d\n", event_num, err); | |
609 | goto cpu_unlock; | |
610 | } | |
ad6eb31e | 611 | |
1bbc7551 GS |
612 | spin_lock(&sdei_list_lock); |
613 | event->reregister = true; | |
614 | spin_unlock(&sdei_list_lock); | |
615 | cpu_unlock: | |
616 | cpus_read_unlock(); | |
617 | unlock: | |
618 | mutex_unlock(&sdei_events_lock); | |
ad6eb31e JM |
619 | return err; |
620 | } | |
ad6eb31e | 621 | |
da351827 JM |
622 | static int sdei_reregister_shared(void) |
623 | { | |
624 | int err = 0; | |
625 | struct sdei_event *event; | |
626 | ||
627 | mutex_lock(&sdei_events_lock); | |
628 | spin_lock(&sdei_list_lock); | |
629 | list_for_each_entry(event, &sdei_list, list) { | |
630 | if (event->type != SDEI_EVENT_TYPE_SHARED) | |
631 | continue; | |
632 | ||
633 | if (event->reregister) { | |
d2fc580d GS |
634 | err = sdei_api_event_register(event->event_num, |
635 | sdei_entry_point, event->registered, | |
636 | SDEI_EVENT_REGISTER_RM_ANY, 0); | |
637 | if (err) { | |
638 | pr_err("Failed to re-register event %u\n", | |
639 | event->event_num); | |
640 | sdei_event_destroy_llocked(event); | |
641 | break; | |
642 | } | |
643 | } | |
644 | ||
645 | if (event->reenable) { | |
646 | err = sdei_api_event_enable(event->event_num); | |
647 | if (err) { | |
648 | pr_err("Failed to re-enable event %u\n", | |
649 | event->event_num); | |
da351827 | 650 | break; |
d2fc580d | 651 | } |
da351827 JM |
652 | } |
653 | } | |
654 | spin_unlock(&sdei_list_lock); | |
655 | mutex_unlock(&sdei_events_lock); | |
656 | ||
657 | return err; | |
658 | } | |
659 | ||
f92b5462 JM |
660 | static int sdei_cpuhp_down(unsigned int cpu) |
661 | { | |
662 | struct sdei_event *event; | |
f4673625 | 663 | int err; |
f92b5462 JM |
664 | |
665 | /* un-register private events */ | |
666 | spin_lock(&sdei_list_lock); | |
667 | list_for_each_entry(event, &sdei_list, list) { | |
668 | if (event->type == SDEI_EVENT_TYPE_SHARED) | |
669 | continue; | |
670 | ||
f4673625 GS |
671 | err = sdei_do_local_call(_local_event_unregister, event); |
672 | if (err) { | |
f92b5462 | 673 | pr_err("Failed to unregister event %u: %d\n", |
f4673625 GS |
674 | event->event_num, err); |
675 | } | |
f92b5462 JM |
676 | } |
677 | spin_unlock(&sdei_list_lock); | |
678 | ||
679 | return sdei_mask_local_cpu(); | |
680 | } | |
681 | ||
682 | static int sdei_cpuhp_up(unsigned int cpu) | |
683 | { | |
684 | struct sdei_event *event; | |
f4673625 | 685 | int err; |
f92b5462 JM |
686 | |
687 | /* re-register/enable private events */ | |
688 | spin_lock(&sdei_list_lock); | |
689 | list_for_each_entry(event, &sdei_list, list) { | |
690 | if (event->type == SDEI_EVENT_TYPE_SHARED) | |
691 | continue; | |
692 | ||
693 | if (event->reregister) { | |
f4673625 GS |
694 | err = sdei_do_local_call(_local_event_register, event); |
695 | if (err) { | |
f92b5462 | 696 | pr_err("Failed to re-register event %u: %d\n", |
f4673625 GS |
697 | event->event_num, err); |
698 | } | |
f92b5462 JM |
699 | } |
700 | ||
701 | if (event->reenable) { | |
f4673625 GS |
702 | err = sdei_do_local_call(_local_event_enable, event); |
703 | if (err) { | |
f92b5462 | 704 | pr_err("Failed to re-enable event %u: %d\n", |
f4673625 GS |
705 | event->event_num, err); |
706 | } | |
f92b5462 JM |
707 | } |
708 | } | |
709 | spin_unlock(&sdei_list_lock); | |
710 | ||
711 | return sdei_unmask_local_cpu(); | |
712 | } | |
713 | ||
da351827 JM |
714 | /* When entering idle, mask/unmask events for this cpu */ |
715 | static int sdei_pm_notifier(struct notifier_block *nb, unsigned long action, | |
716 | void *data) | |
717 | { | |
718 | int rv; | |
719 | ||
720 | switch (action) { | |
721 | case CPU_PM_ENTER: | |
722 | rv = sdei_mask_local_cpu(); | |
723 | break; | |
724 | case CPU_PM_EXIT: | |
725 | case CPU_PM_ENTER_FAILED: | |
726 | rv = sdei_unmask_local_cpu(); | |
727 | break; | |
728 | default: | |
729 | return NOTIFY_DONE; | |
730 | } | |
731 | ||
732 | if (rv) | |
733 | return notifier_from_errno(rv); | |
734 | ||
735 | return NOTIFY_OK; | |
736 | } | |
737 | ||
738 | static struct notifier_block sdei_pm_nb = { | |
739 | .notifier_call = sdei_pm_notifier, | |
740 | }; | |
741 | ||
742 | static int sdei_device_suspend(struct device *dev) | |
743 | { | |
744 | on_each_cpu(_ipi_mask_cpu, NULL, true); | |
745 | ||
746 | return 0; | |
747 | } | |
748 | ||
749 | static int sdei_device_resume(struct device *dev) | |
750 | { | |
751 | on_each_cpu(_ipi_unmask_cpu, NULL, true); | |
752 | ||
753 | return 0; | |
754 | } | |
755 | ||
756 | /* | |
757 | * We need all events to be reregistered when we resume from hibernate. | |
758 | * | |
759 | * The sequence is freeze->thaw. Reboot. freeze->restore. We unregister | |
760 | * events during freeze, then re-register and re-enable them during thaw | |
761 | * and restore. | |
762 | */ | |
763 | static int sdei_device_freeze(struct device *dev) | |
764 | { | |
765 | int err; | |
766 | ||
f92b5462 | 767 | /* unregister private events */ |
da351827 JM |
768 | cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING); |
769 | ||
770 | err = sdei_unregister_shared(); | |
771 | if (err) | |
772 | return err; | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | static int sdei_device_thaw(struct device *dev) | |
778 | { | |
779 | int err; | |
780 | ||
781 | /* re-register shared events */ | |
782 | err = sdei_reregister_shared(); | |
783 | if (err) { | |
784 | pr_warn("Failed to re-register shared events...\n"); | |
785 | sdei_mark_interface_broken(); | |
786 | return err; | |
787 | } | |
788 | ||
789 | err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI", | |
790 | &sdei_cpuhp_up, &sdei_cpuhp_down); | |
791 | if (err) | |
792 | pr_warn("Failed to re-register CPU hotplug notifier...\n"); | |
793 | ||
794 | return err; | |
795 | } | |
796 | ||
797 | static int sdei_device_restore(struct device *dev) | |
798 | { | |
799 | int err; | |
800 | ||
801 | err = sdei_platform_reset(); | |
802 | if (err) | |
803 | return err; | |
804 | ||
805 | return sdei_device_thaw(dev); | |
806 | } | |
807 | ||
808 | static const struct dev_pm_ops sdei_pm_ops = { | |
809 | .suspend = sdei_device_suspend, | |
810 | .resume = sdei_device_resume, | |
811 | .freeze = sdei_device_freeze, | |
812 | .thaw = sdei_device_thaw, | |
813 | .restore = sdei_device_restore, | |
814 | }; | |
815 | ||
816 | /* | |
817 | * Mask all CPUs and unregister all events on panic, reboot or kexec. | |
818 | */ | |
819 | static int sdei_reboot_notifier(struct notifier_block *nb, unsigned long action, | |
820 | void *data) | |
821 | { | |
822 | /* | |
823 | * We are going to reset the interface, after this there is no point | |
824 | * doing work when we take CPUs offline. | |
825 | */ | |
826 | cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING); | |
827 | ||
828 | sdei_platform_reset(); | |
829 | ||
830 | return NOTIFY_OK; | |
831 | } | |
832 | ||
833 | static struct notifier_block sdei_reboot_nb = { | |
834 | .notifier_call = sdei_reboot_notifier, | |
835 | }; | |
836 | ||
ad6eb31e JM |
837 | static void sdei_smccc_smc(unsigned long function_id, |
838 | unsigned long arg0, unsigned long arg1, | |
839 | unsigned long arg2, unsigned long arg3, | |
840 | unsigned long arg4, struct arm_smccc_res *res) | |
841 | { | |
842 | arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res); | |
843 | } | |
2f1d4e24 | 844 | NOKPROBE_SYMBOL(sdei_smccc_smc); |
ad6eb31e JM |
845 | |
846 | static void sdei_smccc_hvc(unsigned long function_id, | |
847 | unsigned long arg0, unsigned long arg1, | |
848 | unsigned long arg2, unsigned long arg3, | |
849 | unsigned long arg4, struct arm_smccc_res *res) | |
850 | { | |
851 | arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res); | |
852 | } | |
2f1d4e24 | 853 | NOKPROBE_SYMBOL(sdei_smccc_hvc); |
ad6eb31e | 854 | |
f96935d3 JM |
855 | int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb, |
856 | sdei_event_callback *critical_cb) | |
857 | { | |
858 | int err; | |
859 | u64 result; | |
860 | u32 event_num; | |
861 | sdei_event_callback *cb; | |
862 | ||
863 | if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES)) | |
864 | return -EOPNOTSUPP; | |
865 | ||
866 | event_num = ghes->generic->notify.vector; | |
867 | if (event_num == 0) { | |
868 | /* | |
869 | * Event 0 is reserved by the specification for | |
870 | * SDEI_EVENT_SIGNAL. | |
871 | */ | |
872 | return -EINVAL; | |
873 | } | |
874 | ||
875 | err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY, | |
876 | &result); | |
877 | if (err) | |
878 | return err; | |
879 | ||
880 | if (result == SDEI_EVENT_PRIORITY_CRITICAL) | |
881 | cb = critical_cb; | |
882 | else | |
883 | cb = normal_cb; | |
884 | ||
885 | err = sdei_event_register(event_num, cb, ghes); | |
886 | if (!err) | |
887 | err = sdei_event_enable(event_num); | |
888 | ||
889 | return err; | |
890 | } | |
891 | ||
892 | int sdei_unregister_ghes(struct ghes *ghes) | |
893 | { | |
894 | int i; | |
895 | int err; | |
896 | u32 event_num = ghes->generic->notify.vector; | |
897 | ||
898 | might_sleep(); | |
899 | ||
900 | if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES)) | |
901 | return -EOPNOTSUPP; | |
902 | ||
903 | /* | |
904 | * The event may be running on another CPU. Disable it | |
905 | * to stop new events, then try to unregister a few times. | |
906 | */ | |
907 | err = sdei_event_disable(event_num); | |
908 | if (err) | |
909 | return err; | |
910 | ||
911 | for (i = 0; i < 3; i++) { | |
912 | err = sdei_event_unregister(event_num); | |
913 | if (err != -EINPROGRESS) | |
914 | break; | |
915 | ||
916 | schedule(); | |
917 | } | |
918 | ||
919 | return err; | |
920 | } | |
921 | ||
ad6eb31e JM |
922 | static int sdei_get_conduit(struct platform_device *pdev) |
923 | { | |
924 | const char *method; | |
925 | struct device_node *np = pdev->dev.of_node; | |
926 | ||
927 | sdei_firmware_call = NULL; | |
928 | if (np) { | |
929 | if (of_property_read_string(np, "method", &method)) { | |
930 | pr_warn("missing \"method\" property\n"); | |
e6ea4651 | 931 | return SMCCC_CONDUIT_NONE; |
ad6eb31e JM |
932 | } |
933 | ||
934 | if (!strcmp("hvc", method)) { | |
935 | sdei_firmware_call = &sdei_smccc_hvc; | |
e6ea4651 | 936 | return SMCCC_CONDUIT_HVC; |
ad6eb31e JM |
937 | } else if (!strcmp("smc", method)) { |
938 | sdei_firmware_call = &sdei_smccc_smc; | |
e6ea4651 | 939 | return SMCCC_CONDUIT_SMC; |
ad6eb31e JM |
940 | } |
941 | ||
942 | pr_warn("invalid \"method\" property: %s\n", method); | |
bc110fd3 | 943 | } else if (!acpi_disabled) { |
677a60bd JM |
944 | if (acpi_psci_use_hvc()) { |
945 | sdei_firmware_call = &sdei_smccc_hvc; | |
e6ea4651 | 946 | return SMCCC_CONDUIT_HVC; |
677a60bd JM |
947 | } else { |
948 | sdei_firmware_call = &sdei_smccc_smc; | |
e6ea4651 | 949 | return SMCCC_CONDUIT_SMC; |
677a60bd | 950 | } |
ad6eb31e JM |
951 | } |
952 | ||
e6ea4651 | 953 | return SMCCC_CONDUIT_NONE; |
ad6eb31e JM |
954 | } |
955 | ||
956 | static int sdei_probe(struct platform_device *pdev) | |
957 | { | |
958 | int err; | |
959 | u64 ver = 0; | |
960 | int conduit; | |
961 | ||
962 | conduit = sdei_get_conduit(pdev); | |
963 | if (!sdei_firmware_call) | |
964 | return 0; | |
965 | ||
966 | err = sdei_api_get_version(&ver); | |
ad6eb31e JM |
967 | if (err) { |
968 | pr_err("Failed to get SDEI version: %d\n", err); | |
969 | sdei_mark_interface_broken(); | |
970 | return err; | |
971 | } | |
972 | ||
973 | pr_info("SDEIv%d.%d (0x%x) detected in firmware.\n", | |
974 | (int)SDEI_VERSION_MAJOR(ver), (int)SDEI_VERSION_MINOR(ver), | |
975 | (int)SDEI_VERSION_VENDOR(ver)); | |
976 | ||
977 | if (SDEI_VERSION_MAJOR(ver) != 1) { | |
978 | pr_warn("Conflicting SDEI version detected.\n"); | |
979 | sdei_mark_interface_broken(); | |
980 | return -EINVAL; | |
981 | } | |
982 | ||
983 | err = sdei_platform_reset(); | |
984 | if (err) | |
985 | return err; | |
986 | ||
987 | sdei_entry_point = sdei_arch_get_entry_point(conduit); | |
988 | if (!sdei_entry_point) { | |
989 | /* Not supported due to hardware or boot configuration */ | |
990 | sdei_mark_interface_broken(); | |
991 | return 0; | |
992 | } | |
993 | ||
da351827 JM |
994 | err = cpu_pm_register_notifier(&sdei_pm_nb); |
995 | if (err) { | |
996 | pr_warn("Failed to register CPU PM notifier...\n"); | |
997 | goto error; | |
998 | } | |
999 | ||
1000 | err = register_reboot_notifier(&sdei_reboot_nb); | |
1001 | if (err) { | |
1002 | pr_warn("Failed to register reboot notifier...\n"); | |
1003 | goto remove_cpupm; | |
1004 | } | |
1005 | ||
1006 | err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI", | |
1007 | &sdei_cpuhp_up, &sdei_cpuhp_down); | |
1008 | if (err) { | |
1009 | pr_warn("Failed to register CPU hotplug notifier...\n"); | |
1010 | goto remove_reboot; | |
1011 | } | |
ad6eb31e JM |
1012 | |
1013 | return 0; | |
da351827 JM |
1014 | |
1015 | remove_reboot: | |
1016 | unregister_reboot_notifier(&sdei_reboot_nb); | |
1017 | ||
1018 | remove_cpupm: | |
1019 | cpu_pm_unregister_notifier(&sdei_pm_nb); | |
1020 | ||
1021 | error: | |
1022 | sdei_mark_interface_broken(); | |
1023 | return err; | |
ad6eb31e JM |
1024 | } |
1025 | ||
1026 | static const struct of_device_id sdei_of_match[] = { | |
1027 | { .compatible = "arm,sdei-1.0" }, | |
1028 | {} | |
1029 | }; | |
1030 | ||
1031 | static struct platform_driver sdei_driver = { | |
1032 | .driver = { | |
1033 | .name = "sdei", | |
da351827 | 1034 | .pm = &sdei_pm_ops, |
ad6eb31e JM |
1035 | .of_match_table = sdei_of_match, |
1036 | }, | |
1037 | .probe = sdei_probe, | |
1038 | }; | |
1039 | ||
677a60bd JM |
1040 | static bool __init sdei_present_acpi(void) |
1041 | { | |
1042 | acpi_status status; | |
677a60bd JM |
1043 | struct acpi_table_header *sdei_table_header; |
1044 | ||
1045 | if (acpi_disabled) | |
1046 | return false; | |
1047 | ||
1048 | status = acpi_get_table(ACPI_SIG_SDEI, 0, &sdei_table_header); | |
1049 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
1050 | const char *msg = acpi_format_exception(status); | |
1051 | ||
1052 | pr_info("Failed to get ACPI:SDEI table, %s\n", msg); | |
1053 | } | |
1054 | if (ACPI_FAILURE(status)) | |
1055 | return false; | |
1056 | ||
70e6352a HG |
1057 | acpi_put_table(sdei_table_header); |
1058 | ||
677a60bd JM |
1059 | return true; |
1060 | } | |
1061 | ||
ad6eb31e JM |
1062 | static int __init sdei_init(void) |
1063 | { | |
10fd7c42 GS |
1064 | struct platform_device *pdev; |
1065 | int ret; | |
1066 | ||
1067 | ret = platform_driver_register(&sdei_driver); | |
1068 | if (ret || !sdei_present_acpi()) | |
1069 | return ret; | |
1070 | ||
1071 | pdev = platform_device_register_simple(sdei_driver.driver.name, | |
1072 | 0, NULL, 0); | |
63627cae GS |
1073 | if (IS_ERR(pdev)) { |
1074 | ret = PTR_ERR(pdev); | |
1075 | platform_driver_unregister(&sdei_driver); | |
1076 | pr_info("Failed to register ACPI:SDEI platform device %d\n", | |
1077 | ret); | |
1078 | } | |
caf2cd61 SH |
1079 | |
1080 | return ret; | |
ad6eb31e JM |
1081 | } |
1082 | ||
677a60bd JM |
1083 | /* |
1084 | * On an ACPI system SDEI needs to be ready before HEST:GHES tries to register | |
1085 | * its events. ACPI is initialised from a subsys_initcall(), GHES is initialised | |
1086 | * by device_initcall(). We want to be called in the middle. | |
1087 | */ | |
ad6eb31e JM |
1088 | subsys_initcall_sync(sdei_init); |
1089 | ||
1090 | int sdei_event_handler(struct pt_regs *regs, | |
1091 | struct sdei_registered_event *arg) | |
1092 | { | |
1093 | int err; | |
ad6eb31e JM |
1094 | u32 event_num = arg->event_num; |
1095 | ||
ad6eb31e JM |
1096 | err = arg->callback(event_num, regs, arg->callback_arg); |
1097 | if (err) | |
1098 | pr_err_ratelimited("event %u on CPU %u failed with error: %d\n", | |
1099 | event_num, smp_processor_id(), err); | |
1100 | ||
ad6eb31e JM |
1101 | return err; |
1102 | } | |
1103 | NOKPROBE_SYMBOL(sdei_event_handler); |