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32#include <linux/kernel.h>
33#include <linux/module.h>
34#include <linux/init.h>
35#include <linux/acpi.h>
36#include <linux/acpi_io.h>
37#include <linux/io.h>
38#include <linux/interrupt.h>
39#include <linux/timer.h>
40#include <linux/cper.h>
41#include <linux/kdebug.h>
42#include <linux/platform_device.h>
43#include <linux/mutex.h>
44#include <linux/ratelimit.h>
45#include <linux/vmalloc.h>
46#include <linux/irq_work.h>
47#include <linux/llist.h>
48#include <linux/genalloc.h>
49#include <linux/pci.h>
50#include <linux/aer.h>
51
52#include <acpi/ghes.h>
53#include <asm/mce.h>
54#include <asm/tlbflush.h>
55#include <asm/nmi.h>
56
57#include "apei-internal.h"
58
59#define GHES_PFX "GHES: "
60
61#define GHES_ESTATUS_MAX_SIZE 65536
62#define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
63
64#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
65
66
67#define GHES_ESTATUS_CACHE_AVG_SIZE 512
68
69#define GHES_ESTATUS_CACHES_SIZE 4
70
71#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
72
73#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
74
75#define GHES_ESTATUS_CACHE_LEN(estatus_len) \
76 (sizeof(struct ghes_estatus_cache) + (estatus_len))
77#define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
78 ((struct acpi_hest_generic_status *) \
79 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
80
81#define GHES_ESTATUS_NODE_LEN(estatus_len) \
82 (sizeof(struct ghes_estatus_node) + (estatus_len))
83#define GHES_ESTATUS_FROM_NODE(estatus_node) \
84 ((struct acpi_hest_generic_status *) \
85 ((struct ghes_estatus_node *)(estatus_node) + 1))
86
87bool ghes_disable;
88module_param_named(disable, ghes_disable, bool, 0);
89
90static int ghes_panic_timeout __read_mostly = 30;
91
92
93
94
95
96
97
98
99
100static LIST_HEAD(ghes_sci);
101static LIST_HEAD(ghes_nmi);
102static DEFINE_MUTEX(ghes_list_mutex);
103
104
105
106
107
108static DEFINE_RAW_SPINLOCK(ghes_nmi_lock);
109
110
111
112
113
114
115
116
117
118
119
120
121#define GHES_IOREMAP_PAGES 2
122#define GHES_IOREMAP_NMI_PAGE(base) (base)
123#define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE)
124
125
126static struct vm_struct *ghes_ioremap_area;
127
128
129
130
131static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
132static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
133
134
135
136
137
138
139
140
141
142static struct gen_pool *ghes_estatus_pool;
143static unsigned long ghes_estatus_pool_size_request;
144static struct llist_head ghes_estatus_llist;
145static struct irq_work ghes_proc_irq_work;
146
147struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
148static atomic_t ghes_estatus_cache_alloced;
149
150static int ghes_ioremap_init(void)
151{
152 ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
153 VM_IOREMAP, VMALLOC_START, VMALLOC_END);
154 if (!ghes_ioremap_area) {
155 pr_err(GHES_PFX "Failed to allocate virtual memory area for atomic ioremap.\n");
156 return -ENOMEM;
157 }
158
159 return 0;
160}
161
162static void ghes_ioremap_exit(void)
163{
164 free_vm_area(ghes_ioremap_area);
165}
166
167static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
168{
169 unsigned long vaddr;
170
171 vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
172 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
173 pfn << PAGE_SHIFT, PAGE_KERNEL);
174
175 return (void __iomem *)vaddr;
176}
177
178static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
179{
180 unsigned long vaddr;
181
182 vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr);
183 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
184 pfn << PAGE_SHIFT, PAGE_KERNEL);
185
186 return (void __iomem *)vaddr;
187}
188
189static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)
190{
191 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
192 void *base = ghes_ioremap_area->addr;
193
194 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
195 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
196 __flush_tlb_one(vaddr);
197}
198
199static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
200{
201 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
202 void *base = ghes_ioremap_area->addr;
203
204 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
205 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
206 __flush_tlb_one(vaddr);
207}
208
209static int ghes_estatus_pool_init(void)
210{
211 ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
212 if (!ghes_estatus_pool)
213 return -ENOMEM;
214 return 0;
215}
216
217static void ghes_estatus_pool_free_chunk_page(struct gen_pool *pool,
218 struct gen_pool_chunk *chunk,
219 void *data)
220{
221 free_page(chunk->start_addr);
222}
223
224static void ghes_estatus_pool_exit(void)
225{
226 gen_pool_for_each_chunk(ghes_estatus_pool,
227 ghes_estatus_pool_free_chunk_page, NULL);
228 gen_pool_destroy(ghes_estatus_pool);
229}
230
231static int ghes_estatus_pool_expand(unsigned long len)
232{
233 unsigned long i, pages, size, addr;
234 int ret;
235
236 ghes_estatus_pool_size_request += PAGE_ALIGN(len);
237 size = gen_pool_size(ghes_estatus_pool);
238 if (size >= ghes_estatus_pool_size_request)
239 return 0;
240 pages = (ghes_estatus_pool_size_request - size) / PAGE_SIZE;
241 for (i = 0; i < pages; i++) {
242 addr = __get_free_page(GFP_KERNEL);
243 if (!addr)
244 return -ENOMEM;
245 ret = gen_pool_add(ghes_estatus_pool, addr, PAGE_SIZE, -1);
246 if (ret)
247 return ret;
248 }
249
250 return 0;
251}
252
253static void ghes_estatus_pool_shrink(unsigned long len)
254{
255 ghes_estatus_pool_size_request -= PAGE_ALIGN(len);
256}
257
258static struct ghes *ghes_new(struct acpi_hest_generic *generic)
259{
260 struct ghes *ghes;
261 unsigned int error_block_length;
262 int rc;
263
264 ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
265 if (!ghes)
266 return ERR_PTR(-ENOMEM);
267 ghes->generic = generic;
268 rc = apei_map_generic_address(&generic->error_status_address);
269 if (rc)
270 goto err_free;
271 error_block_length = generic->error_block_length;
272 if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
273 pr_warning(FW_WARN GHES_PFX
274 "Error status block length is too long: %u for "
275 "generic hardware error source: %d.\n",
276 error_block_length, generic->header.source_id);
277 error_block_length = GHES_ESTATUS_MAX_SIZE;
278 }
279 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
280 if (!ghes->estatus) {
281 rc = -ENOMEM;
282 goto err_unmap;
283 }
284
285 return ghes;
286
287err_unmap:
288 apei_unmap_generic_address(&generic->error_status_address);
289err_free:
290 kfree(ghes);
291 return ERR_PTR(rc);
292}
293
294static void ghes_fini(struct ghes *ghes)
295{
296 kfree(ghes->estatus);
297 apei_unmap_generic_address(&ghes->generic->error_status_address);
298}
299
300static inline int ghes_severity(int severity)
301{
302 switch (severity) {
303 case CPER_SEV_INFORMATIONAL:
304 return GHES_SEV_NO;
305 case CPER_SEV_CORRECTED:
306 return GHES_SEV_CORRECTED;
307 case CPER_SEV_RECOVERABLE:
308 return GHES_SEV_RECOVERABLE;
309 case CPER_SEV_FATAL:
310 return GHES_SEV_PANIC;
311 default:
312
313 return GHES_SEV_PANIC;
314 }
315}
316
317static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
318 int from_phys)
319{
320 void __iomem *vaddr;
321 unsigned long flags = 0;
322 int in_nmi = in_nmi();
323 u64 offset;
324 u32 trunk;
325
326 while (len > 0) {
327 offset = paddr - (paddr & PAGE_MASK);
328 if (in_nmi) {
329 raw_spin_lock(&ghes_ioremap_lock_nmi);
330 vaddr = ghes_ioremap_pfn_nmi(paddr >> PAGE_SHIFT);
331 } else {
332 spin_lock_irqsave(&ghes_ioremap_lock_irq, flags);
333 vaddr = ghes_ioremap_pfn_irq(paddr >> PAGE_SHIFT);
334 }
335 trunk = PAGE_SIZE - offset;
336 trunk = min(trunk, len);
337 if (from_phys)
338 memcpy_fromio(buffer, vaddr + offset, trunk);
339 else
340 memcpy_toio(vaddr + offset, buffer, trunk);
341 len -= trunk;
342 paddr += trunk;
343 buffer += trunk;
344 if (in_nmi) {
345 ghes_iounmap_nmi(vaddr);
346 raw_spin_unlock(&ghes_ioremap_lock_nmi);
347 } else {
348 ghes_iounmap_irq(vaddr);
349 spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags);
350 }
351 }
352}
353
354static int ghes_read_estatus(struct ghes *ghes, int silent)
355{
356 struct acpi_hest_generic *g = ghes->generic;
357 u64 buf_paddr;
358 u32 len;
359 int rc;
360
361 rc = apei_read(&buf_paddr, &g->error_status_address);
362 if (rc) {
363 if (!silent && printk_ratelimit())
364 pr_warning(FW_WARN GHES_PFX
365"Failed to read error status block address for hardware error source: %d.\n",
366 g->header.source_id);
367 return -EIO;
368 }
369 if (!buf_paddr)
370 return -ENOENT;
371
372 ghes_copy_tofrom_phys(ghes->estatus, buf_paddr,
373 sizeof(*ghes->estatus), 1);
374 if (!ghes->estatus->block_status)
375 return -ENOENT;
376
377 ghes->buffer_paddr = buf_paddr;
378 ghes->flags |= GHES_TO_CLEAR;
379
380 rc = -EIO;
381 len = apei_estatus_len(ghes->estatus);
382 if (len < sizeof(*ghes->estatus))
383 goto err_read_block;
384 if (len > ghes->generic->error_block_length)
385 goto err_read_block;
386 if (apei_estatus_check_header(ghes->estatus))
387 goto err_read_block;
388 ghes_copy_tofrom_phys(ghes->estatus + 1,
389 buf_paddr + sizeof(*ghes->estatus),
390 len - sizeof(*ghes->estatus), 1);
391 if (apei_estatus_check(ghes->estatus))
392 goto err_read_block;
393 rc = 0;
394
395err_read_block:
396 if (rc && !silent && printk_ratelimit())
397 pr_warning(FW_WARN GHES_PFX
398 "Failed to read error status block!\n");
399 return rc;
400}
401
402static void ghes_clear_estatus(struct ghes *ghes)
403{
404 ghes->estatus->block_status = 0;
405 if (!(ghes->flags & GHES_TO_CLEAR))
406 return;
407 ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr,
408 sizeof(ghes->estatus->block_status), 0);
409 ghes->flags &= ~GHES_TO_CLEAR;
410}
411
412static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int sev)
413{
414#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
415 unsigned long pfn;
416 int sec_sev = ghes_severity(gdata->error_severity);
417 struct cper_sec_mem_err *mem_err;
418 mem_err = (struct cper_sec_mem_err *)(gdata + 1);
419
420 if (sec_sev == GHES_SEV_CORRECTED &&
421 (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED) &&
422 (mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS)) {
423 pfn = mem_err->physical_addr >> PAGE_SHIFT;
424 if (pfn_valid(pfn))
425 memory_failure_queue(pfn, 0, MF_SOFT_OFFLINE);
426 else if (printk_ratelimit())
427 pr_warn(FW_WARN GHES_PFX
428 "Invalid address in generic error data: %#llx\n",
429 mem_err->physical_addr);
430 }
431 if (sev == GHES_SEV_RECOVERABLE &&
432 sec_sev == GHES_SEV_RECOVERABLE &&
433 mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS) {
434 pfn = mem_err->physical_addr >> PAGE_SHIFT;
435 memory_failure_queue(pfn, 0, 0);
436 }
437#endif
438}
439
440static void ghes_do_proc(struct ghes *ghes,
441 const struct acpi_hest_generic_status *estatus)
442{
443 int sev, sec_sev;
444 struct acpi_hest_generic_data *gdata;
445
446 sev = ghes_severity(estatus->error_severity);
447 apei_estatus_for_each_section(estatus, gdata) {
448 sec_sev = ghes_severity(gdata->error_severity);
449 if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
450 CPER_SEC_PLATFORM_MEM)) {
451 struct cper_sec_mem_err *mem_err;
452 mem_err = (struct cper_sec_mem_err *)(gdata+1);
453 ghes_edac_report_mem_error(ghes, sev, mem_err);
454
455#ifdef CONFIG_X86_MCE
456 apei_mce_report_mem_error(sev == GHES_SEV_CORRECTED,
457 mem_err);
458#endif
459 ghes_handle_memory_failure(gdata, sev);
460 }
461#ifdef CONFIG_ACPI_APEI_PCIEAER
462 else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
463 CPER_SEC_PCIE)) {
464 struct cper_sec_pcie *pcie_err;
465 pcie_err = (struct cper_sec_pcie *)(gdata+1);
466 if (sev == GHES_SEV_RECOVERABLE &&
467 sec_sev == GHES_SEV_RECOVERABLE &&
468 pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
469 pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
470 unsigned int devfn;
471 int aer_severity;
472
473 devfn = PCI_DEVFN(pcie_err->device_id.device,
474 pcie_err->device_id.function);
475 aer_severity = cper_severity_to_aer(sev);
476
477
478
479
480
481
482 if (gdata->flags & CPER_SEC_RESET)
483 aer_severity = AER_FATAL;
484
485 aer_recover_queue(pcie_err->device_id.segment,
486 pcie_err->device_id.bus,
487 devfn, aer_severity,
488 (struct aer_capability_regs *)
489 pcie_err->aer_info);
490 }
491
492 }
493#endif
494 }
495}
496
497static void __ghes_print_estatus(const char *pfx,
498 const struct acpi_hest_generic *generic,
499 const struct acpi_hest_generic_status *estatus)
500{
501 static atomic_t seqno;
502 unsigned int curr_seqno;
503 char pfx_seq[64];
504
505 if (pfx == NULL) {
506 if (ghes_severity(estatus->error_severity) <=
507 GHES_SEV_CORRECTED)
508 pfx = KERN_WARNING;
509 else
510 pfx = KERN_ERR;
511 }
512 curr_seqno = atomic_inc_return(&seqno);
513 snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
514 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
515 pfx_seq, generic->header.source_id);
516 apei_estatus_print(pfx_seq, estatus);
517}
518
519static int ghes_print_estatus(const char *pfx,
520 const struct acpi_hest_generic *generic,
521 const struct acpi_hest_generic_status *estatus)
522{
523
524 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
525 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
526 struct ratelimit_state *ratelimit;
527
528 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
529 ratelimit = &ratelimit_corrected;
530 else
531 ratelimit = &ratelimit_uncorrected;
532 if (__ratelimit(ratelimit)) {
533 __ghes_print_estatus(pfx, generic, estatus);
534 return 1;
535 }
536 return 0;
537}
538
539
540
541
542
543static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
544{
545 u32 len;
546 int i, cached = 0;
547 unsigned long long now;
548 struct ghes_estatus_cache *cache;
549 struct acpi_hest_generic_status *cache_estatus;
550
551 len = apei_estatus_len(estatus);
552 rcu_read_lock();
553 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
554 cache = rcu_dereference(ghes_estatus_caches[i]);
555 if (cache == NULL)
556 continue;
557 if (len != cache->estatus_len)
558 continue;
559 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
560 if (memcmp(estatus, cache_estatus, len))
561 continue;
562 atomic_inc(&cache->count);
563 now = sched_clock();
564 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
565 cached = 1;
566 break;
567 }
568 rcu_read_unlock();
569 return cached;
570}
571
572static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
573 struct acpi_hest_generic *generic,
574 struct acpi_hest_generic_status *estatus)
575{
576 int alloced;
577 u32 len, cache_len;
578 struct ghes_estatus_cache *cache;
579 struct acpi_hest_generic_status *cache_estatus;
580
581 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
582 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
583 atomic_dec(&ghes_estatus_cache_alloced);
584 return NULL;
585 }
586 len = apei_estatus_len(estatus);
587 cache_len = GHES_ESTATUS_CACHE_LEN(len);
588 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
589 if (!cache) {
590 atomic_dec(&ghes_estatus_cache_alloced);
591 return NULL;
592 }
593 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
594 memcpy(cache_estatus, estatus, len);
595 cache->estatus_len = len;
596 atomic_set(&cache->count, 0);
597 cache->generic = generic;
598 cache->time_in = sched_clock();
599 return cache;
600}
601
602static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
603{
604 u32 len;
605
606 len = apei_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
607 len = GHES_ESTATUS_CACHE_LEN(len);
608 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
609 atomic_dec(&ghes_estatus_cache_alloced);
610}
611
612static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
613{
614 struct ghes_estatus_cache *cache;
615
616 cache = container_of(head, struct ghes_estatus_cache, rcu);
617 ghes_estatus_cache_free(cache);
618}
619
620static void ghes_estatus_cache_add(
621 struct acpi_hest_generic *generic,
622 struct acpi_hest_generic_status *estatus)
623{
624 int i, slot = -1, count;
625 unsigned long long now, duration, period, max_period = 0;
626 struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
627
628 new_cache = ghes_estatus_cache_alloc(generic, estatus);
629 if (new_cache == NULL)
630 return;
631 rcu_read_lock();
632 now = sched_clock();
633 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
634 cache = rcu_dereference(ghes_estatus_caches[i]);
635 if (cache == NULL) {
636 slot = i;
637 slot_cache = NULL;
638 break;
639 }
640 duration = now - cache->time_in;
641 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
642 slot = i;
643 slot_cache = cache;
644 break;
645 }
646 count = atomic_read(&cache->count);
647 period = duration;
648 do_div(period, (count + 1));
649 if (period > max_period) {
650 max_period = period;
651 slot = i;
652 slot_cache = cache;
653 }
654 }
655
656 smp_wmb();
657 if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
658 slot_cache, new_cache) == slot_cache) {
659 if (slot_cache)
660 call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
661 } else
662 ghes_estatus_cache_free(new_cache);
663 rcu_read_unlock();
664}
665
666static int ghes_proc(struct ghes *ghes)
667{
668 int rc;
669
670 rc = ghes_read_estatus(ghes, 0);
671 if (rc)
672 goto out;
673 if (!ghes_estatus_cached(ghes->estatus)) {
674 if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
675 ghes_estatus_cache_add(ghes->generic, ghes->estatus);
676 }
677 ghes_do_proc(ghes, ghes->estatus);
678out:
679 ghes_clear_estatus(ghes);
680 return 0;
681}
682
683static void ghes_add_timer(struct ghes *ghes)
684{
685 struct acpi_hest_generic *g = ghes->generic;
686 unsigned long expire;
687
688 if (!g->notify.poll_interval) {
689 pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
690 g->header.source_id);
691 return;
692 }
693 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
694 ghes->timer.expires = round_jiffies_relative(expire);
695 add_timer(&ghes->timer);
696}
697
698static void ghes_poll_func(unsigned long data)
699{
700 struct ghes *ghes = (void *)data;
701
702 ghes_proc(ghes);
703 if (!(ghes->flags & GHES_EXITING))
704 ghes_add_timer(ghes);
705}
706
707static irqreturn_t ghes_irq_func(int irq, void *data)
708{
709 struct ghes *ghes = data;
710 int rc;
711
712 rc = ghes_proc(ghes);
713 if (rc)
714 return IRQ_NONE;
715
716 return IRQ_HANDLED;
717}
718
719static int ghes_notify_sci(struct notifier_block *this,
720 unsigned long event, void *data)
721{
722 struct ghes *ghes;
723 int ret = NOTIFY_DONE;
724
725 rcu_read_lock();
726 list_for_each_entry_rcu(ghes, &ghes_sci, list) {
727 if (!ghes_proc(ghes))
728 ret = NOTIFY_OK;
729 }
730 rcu_read_unlock();
731
732 return ret;
733}
734
735static struct llist_node *llist_nodes_reverse(struct llist_node *llnode)
736{
737 struct llist_node *next, *tail = NULL;
738
739 while (llnode) {
740 next = llnode->next;
741 llnode->next = tail;
742 tail = llnode;
743 llnode = next;
744 }
745
746 return tail;
747}
748
749static void ghes_proc_in_irq(struct irq_work *irq_work)
750{
751 struct llist_node *llnode, *next;
752 struct ghes_estatus_node *estatus_node;
753 struct acpi_hest_generic *generic;
754 struct acpi_hest_generic_status *estatus;
755 u32 len, node_len;
756
757 llnode = llist_del_all(&ghes_estatus_llist);
758
759
760
761
762 llnode = llist_nodes_reverse(llnode);
763 while (llnode) {
764 next = llnode->next;
765 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
766 llnode);
767 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
768 len = apei_estatus_len(estatus);
769 node_len = GHES_ESTATUS_NODE_LEN(len);
770 ghes_do_proc(estatus_node->ghes, estatus);
771 if (!ghes_estatus_cached(estatus)) {
772 generic = estatus_node->generic;
773 if (ghes_print_estatus(NULL, generic, estatus))
774 ghes_estatus_cache_add(generic, estatus);
775 }
776 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
777 node_len);
778 llnode = next;
779 }
780}
781
782static void ghes_print_queued_estatus(void)
783{
784 struct llist_node *llnode;
785 struct ghes_estatus_node *estatus_node;
786 struct acpi_hest_generic *generic;
787 struct acpi_hest_generic_status *estatus;
788 u32 len, node_len;
789
790 llnode = llist_del_all(&ghes_estatus_llist);
791
792
793
794
795 llnode = llist_nodes_reverse(llnode);
796 while (llnode) {
797 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
798 llnode);
799 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
800 len = apei_estatus_len(estatus);
801 node_len = GHES_ESTATUS_NODE_LEN(len);
802 generic = estatus_node->generic;
803 ghes_print_estatus(NULL, generic, estatus);
804 llnode = llnode->next;
805 }
806}
807
808static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
809{
810 struct ghes *ghes, *ghes_global = NULL;
811 int sev, sev_global = -1;
812 int ret = NMI_DONE;
813
814 raw_spin_lock(&ghes_nmi_lock);
815 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
816 if (ghes_read_estatus(ghes, 1)) {
817 ghes_clear_estatus(ghes);
818 continue;
819 }
820 sev = ghes_severity(ghes->estatus->error_severity);
821 if (sev > sev_global) {
822 sev_global = sev;
823 ghes_global = ghes;
824 }
825 ret = NMI_HANDLED;
826 }
827
828 if (ret == NMI_DONE)
829 goto out;
830
831 if (sev_global >= GHES_SEV_PANIC) {
832 oops_begin();
833 ghes_print_queued_estatus();
834 __ghes_print_estatus(KERN_EMERG, ghes_global->generic,
835 ghes_global->estatus);
836
837 if (panic_timeout == 0)
838 panic_timeout = ghes_panic_timeout;
839 panic("Fatal hardware error!");
840 }
841
842 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
843#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
844 u32 len, node_len;
845 struct ghes_estatus_node *estatus_node;
846 struct acpi_hest_generic_status *estatus;
847#endif
848 if (!(ghes->flags & GHES_TO_CLEAR))
849 continue;
850#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
851 if (ghes_estatus_cached(ghes->estatus))
852 goto next;
853
854 len = apei_estatus_len(ghes->estatus);
855 node_len = GHES_ESTATUS_NODE_LEN(len);
856 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
857 node_len);
858 if (estatus_node) {
859 estatus_node->ghes = ghes;
860 estatus_node->generic = ghes->generic;
861 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
862 memcpy(estatus, ghes->estatus, len);
863 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
864 }
865next:
866#endif
867 ghes_clear_estatus(ghes);
868 }
869#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
870 irq_work_queue(&ghes_proc_irq_work);
871#endif
872
873out:
874 raw_spin_unlock(&ghes_nmi_lock);
875 return ret;
876}
877
878static struct notifier_block ghes_notifier_sci = {
879 .notifier_call = ghes_notify_sci,
880};
881
882static unsigned long ghes_esource_prealloc_size(
883 const struct acpi_hest_generic *generic)
884{
885 unsigned long block_length, prealloc_records, prealloc_size;
886
887 block_length = min_t(unsigned long, generic->error_block_length,
888 GHES_ESTATUS_MAX_SIZE);
889 prealloc_records = max_t(unsigned long,
890 generic->records_to_preallocate, 1);
891 prealloc_size = min_t(unsigned long, block_length * prealloc_records,
892 GHES_ESOURCE_PREALLOC_MAX_SIZE);
893
894 return prealloc_size;
895}
896
897static int ghes_probe(struct platform_device *ghes_dev)
898{
899 struct acpi_hest_generic *generic;
900 struct ghes *ghes = NULL;
901 unsigned long len;
902 int rc = -EINVAL;
903
904 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
905 if (!generic->enabled)
906 return -ENODEV;
907
908 switch (generic->notify.type) {
909 case ACPI_HEST_NOTIFY_POLLED:
910 case ACPI_HEST_NOTIFY_EXTERNAL:
911 case ACPI_HEST_NOTIFY_SCI:
912 case ACPI_HEST_NOTIFY_NMI:
913 break;
914 case ACPI_HEST_NOTIFY_LOCAL:
915 pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
916 generic->header.source_id);
917 goto err;
918 default:
919 pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
920 generic->notify.type, generic->header.source_id);
921 goto err;
922 }
923
924 rc = -EIO;
925 if (generic->error_block_length <
926 sizeof(struct acpi_hest_generic_status)) {
927 pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
928 generic->error_block_length,
929 generic->header.source_id);
930 goto err;
931 }
932 ghes = ghes_new(generic);
933 if (IS_ERR(ghes)) {
934 rc = PTR_ERR(ghes);
935 ghes = NULL;
936 goto err;
937 }
938
939 rc = ghes_edac_register(ghes, &ghes_dev->dev);
940 if (rc < 0)
941 goto err;
942
943 switch (generic->notify.type) {
944 case ACPI_HEST_NOTIFY_POLLED:
945 ghes->timer.function = ghes_poll_func;
946 ghes->timer.data = (unsigned long)ghes;
947 init_timer_deferrable(&ghes->timer);
948 ghes_add_timer(ghes);
949 break;
950 case ACPI_HEST_NOTIFY_EXTERNAL:
951
952 rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
953 if (rc) {
954 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
955 generic->header.source_id);
956 goto err_edac_unreg;
957 }
958 rc = request_irq(ghes->irq, ghes_irq_func, 0, "GHES IRQ", ghes);
959 if (rc) {
960 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
961 generic->header.source_id);
962 goto err_edac_unreg;
963 }
964 break;
965 case ACPI_HEST_NOTIFY_SCI:
966 mutex_lock(&ghes_list_mutex);
967 if (list_empty(&ghes_sci))
968 register_acpi_hed_notifier(&ghes_notifier_sci);
969 list_add_rcu(&ghes->list, &ghes_sci);
970 mutex_unlock(&ghes_list_mutex);
971 break;
972 case ACPI_HEST_NOTIFY_NMI:
973 len = ghes_esource_prealloc_size(generic);
974 ghes_estatus_pool_expand(len);
975 mutex_lock(&ghes_list_mutex);
976 if (list_empty(&ghes_nmi))
977 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0,
978 "ghes");
979 list_add_rcu(&ghes->list, &ghes_nmi);
980 mutex_unlock(&ghes_list_mutex);
981 break;
982 default:
983 BUG();
984 }
985 platform_set_drvdata(ghes_dev, ghes);
986
987 return 0;
988err_edac_unreg:
989 ghes_edac_unregister(ghes);
990err:
991 if (ghes) {
992 ghes_fini(ghes);
993 kfree(ghes);
994 }
995 return rc;
996}
997
998static int ghes_remove(struct platform_device *ghes_dev)
999{
1000 struct ghes *ghes;
1001 struct acpi_hest_generic *generic;
1002 unsigned long len;
1003
1004 ghes = platform_get_drvdata(ghes_dev);
1005 generic = ghes->generic;
1006
1007 ghes->flags |= GHES_EXITING;
1008 switch (generic->notify.type) {
1009 case ACPI_HEST_NOTIFY_POLLED:
1010 del_timer_sync(&ghes->timer);
1011 break;
1012 case ACPI_HEST_NOTIFY_EXTERNAL:
1013 free_irq(ghes->irq, ghes);
1014 break;
1015 case ACPI_HEST_NOTIFY_SCI:
1016 mutex_lock(&ghes_list_mutex);
1017 list_del_rcu(&ghes->list);
1018 if (list_empty(&ghes_sci))
1019 unregister_acpi_hed_notifier(&ghes_notifier_sci);
1020 mutex_unlock(&ghes_list_mutex);
1021 break;
1022 case ACPI_HEST_NOTIFY_NMI:
1023 mutex_lock(&ghes_list_mutex);
1024 list_del_rcu(&ghes->list);
1025 if (list_empty(&ghes_nmi))
1026 unregister_nmi_handler(NMI_LOCAL, "ghes");
1027 mutex_unlock(&ghes_list_mutex);
1028
1029
1030
1031
1032 synchronize_rcu();
1033 len = ghes_esource_prealloc_size(generic);
1034 ghes_estatus_pool_shrink(len);
1035 break;
1036 default:
1037 BUG();
1038 break;
1039 }
1040
1041 ghes_fini(ghes);
1042
1043 ghes_edac_unregister(ghes);
1044
1045 kfree(ghes);
1046
1047 platform_set_drvdata(ghes_dev, NULL);
1048
1049 return 0;
1050}
1051
1052static struct platform_driver ghes_platform_driver = {
1053 .driver = {
1054 .name = "GHES",
1055 .owner = THIS_MODULE,
1056 },
1057 .probe = ghes_probe,
1058 .remove = ghes_remove,
1059};
1060
1061static int __init ghes_init(void)
1062{
1063 int rc;
1064
1065 if (acpi_disabled)
1066 return -ENODEV;
1067
1068 if (hest_disable) {
1069 pr_info(GHES_PFX "HEST is not enabled!\n");
1070 return -EINVAL;
1071 }
1072
1073 if (ghes_disable) {
1074 pr_info(GHES_PFX "GHES is not enabled!\n");
1075 return -EINVAL;
1076 }
1077
1078 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1079
1080 rc = ghes_ioremap_init();
1081 if (rc)
1082 goto err;
1083
1084 rc = ghes_estatus_pool_init();
1085 if (rc)
1086 goto err_ioremap_exit;
1087
1088 rc = ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
1089 GHES_ESTATUS_CACHE_ALLOCED_MAX);
1090 if (rc)
1091 goto err_pool_exit;
1092
1093 rc = platform_driver_register(&ghes_platform_driver);
1094 if (rc)
1095 goto err_pool_exit;
1096
1097 rc = apei_osc_setup();
1098 if (rc == 0 && osc_sb_apei_support_acked)
1099 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1100 else if (rc == 0 && !osc_sb_apei_support_acked)
1101 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1102 else if (rc && osc_sb_apei_support_acked)
1103 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1104 else
1105 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1106
1107 return 0;
1108err_pool_exit:
1109 ghes_estatus_pool_exit();
1110err_ioremap_exit:
1111 ghes_ioremap_exit();
1112err:
1113 return rc;
1114}
1115
1116static void __exit ghes_exit(void)
1117{
1118 platform_driver_unregister(&ghes_platform_driver);
1119 ghes_estatus_pool_exit();
1120 ghes_ioremap_exit();
1121}
1122
1123module_init(ghes_init);
1124module_exit(ghes_exit);
1125
1126MODULE_AUTHOR("Huang Ying");
1127MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1128MODULE_LICENSE("GPL");
1129MODULE_ALIAS("platform:GHES");
1130
