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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_do_proc(struct ghes *ghes,
413 const struct acpi_hest_generic_status *estatus)
414{
415 int sev, sec_sev;
416 struct acpi_hest_generic_data *gdata;
417
418 sev = ghes_severity(estatus->error_severity);
419 apei_estatus_for_each_section(estatus, gdata) {
420 sec_sev = ghes_severity(gdata->error_severity);
421 if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
422 CPER_SEC_PLATFORM_MEM)) {
423 struct cper_sec_mem_err *mem_err;
424 mem_err = (struct cper_sec_mem_err *)(gdata+1);
425 ghes_edac_report_mem_error(ghes, sev, mem_err);
426
427#ifdef CONFIG_X86_MCE
428 apei_mce_report_mem_error(sev == GHES_SEV_CORRECTED,
429 mem_err);
430#endif
431#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
432 if (sev == GHES_SEV_RECOVERABLE &&
433 sec_sev == GHES_SEV_RECOVERABLE &&
434 mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS) {
435 unsigned long pfn;
436 pfn = mem_err->physical_addr >> PAGE_SHIFT;
437 memory_failure_queue(pfn, 0, 0);
438 }
439#endif
440 }
441#ifdef CONFIG_ACPI_APEI_PCIEAER
442 else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
443 CPER_SEC_PCIE)) {
444 struct cper_sec_pcie *pcie_err;
445 pcie_err = (struct cper_sec_pcie *)(gdata+1);
446 if (sev == GHES_SEV_RECOVERABLE &&
447 sec_sev == GHES_SEV_RECOVERABLE &&
448 pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
449 pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
450 unsigned int devfn;
451 int aer_severity;
452
453 devfn = PCI_DEVFN(pcie_err->device_id.device,
454 pcie_err->device_id.function);
455 aer_severity = cper_severity_to_aer(sev);
456
457
458
459
460
461
462 if (gdata->flags & CPER_SEC_RESET)
463 aer_severity = AER_FATAL;
464
465 aer_recover_queue(pcie_err->device_id.segment,
466 pcie_err->device_id.bus,
467 devfn, aer_severity,
468 (struct aer_capability_regs *)
469 pcie_err->aer_info);
470 }
471
472 }
473#endif
474 }
475}
476
477static void __ghes_print_estatus(const char *pfx,
478 const struct acpi_hest_generic *generic,
479 const struct acpi_hest_generic_status *estatus)
480{
481 static atomic_t seqno;
482 unsigned int curr_seqno;
483 char pfx_seq[64];
484
485 if (pfx == NULL) {
486 if (ghes_severity(estatus->error_severity) <=
487 GHES_SEV_CORRECTED)
488 pfx = KERN_WARNING;
489 else
490 pfx = KERN_ERR;
491 }
492 curr_seqno = atomic_inc_return(&seqno);
493 snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
494 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
495 pfx_seq, generic->header.source_id);
496 apei_estatus_print(pfx_seq, estatus);
497}
498
499static int ghes_print_estatus(const char *pfx,
500 const struct acpi_hest_generic *generic,
501 const struct acpi_hest_generic_status *estatus)
502{
503
504 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
505 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
506 struct ratelimit_state *ratelimit;
507
508 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
509 ratelimit = &ratelimit_corrected;
510 else
511 ratelimit = &ratelimit_uncorrected;
512 if (__ratelimit(ratelimit)) {
513 __ghes_print_estatus(pfx, generic, estatus);
514 return 1;
515 }
516 return 0;
517}
518
519
520
521
522
523static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
524{
525 u32 len;
526 int i, cached = 0;
527 unsigned long long now;
528 struct ghes_estatus_cache *cache;
529 struct acpi_hest_generic_status *cache_estatus;
530
531 len = apei_estatus_len(estatus);
532 rcu_read_lock();
533 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
534 cache = rcu_dereference(ghes_estatus_caches[i]);
535 if (cache == NULL)
536 continue;
537 if (len != cache->estatus_len)
538 continue;
539 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
540 if (memcmp(estatus, cache_estatus, len))
541 continue;
542 atomic_inc(&cache->count);
543 now = sched_clock();
544 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
545 cached = 1;
546 break;
547 }
548 rcu_read_unlock();
549 return cached;
550}
551
552static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
553 struct acpi_hest_generic *generic,
554 struct acpi_hest_generic_status *estatus)
555{
556 int alloced;
557 u32 len, cache_len;
558 struct ghes_estatus_cache *cache;
559 struct acpi_hest_generic_status *cache_estatus;
560
561 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
562 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
563 atomic_dec(&ghes_estatus_cache_alloced);
564 return NULL;
565 }
566 len = apei_estatus_len(estatus);
567 cache_len = GHES_ESTATUS_CACHE_LEN(len);
568 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
569 if (!cache) {
570 atomic_dec(&ghes_estatus_cache_alloced);
571 return NULL;
572 }
573 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
574 memcpy(cache_estatus, estatus, len);
575 cache->estatus_len = len;
576 atomic_set(&cache->count, 0);
577 cache->generic = generic;
578 cache->time_in = sched_clock();
579 return cache;
580}
581
582static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
583{
584 u32 len;
585
586 len = apei_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
587 len = GHES_ESTATUS_CACHE_LEN(len);
588 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
589 atomic_dec(&ghes_estatus_cache_alloced);
590}
591
592static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
593{
594 struct ghes_estatus_cache *cache;
595
596 cache = container_of(head, struct ghes_estatus_cache, rcu);
597 ghes_estatus_cache_free(cache);
598}
599
600static void ghes_estatus_cache_add(
601 struct acpi_hest_generic *generic,
602 struct acpi_hest_generic_status *estatus)
603{
604 int i, slot = -1, count;
605 unsigned long long now, duration, period, max_period = 0;
606 struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
607
608 new_cache = ghes_estatus_cache_alloc(generic, estatus);
609 if (new_cache == NULL)
610 return;
611 rcu_read_lock();
612 now = sched_clock();
613 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
614 cache = rcu_dereference(ghes_estatus_caches[i]);
615 if (cache == NULL) {
616 slot = i;
617 slot_cache = NULL;
618 break;
619 }
620 duration = now - cache->time_in;
621 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
622 slot = i;
623 slot_cache = cache;
624 break;
625 }
626 count = atomic_read(&cache->count);
627 period = duration;
628 do_div(period, (count + 1));
629 if (period > max_period) {
630 max_period = period;
631 slot = i;
632 slot_cache = cache;
633 }
634 }
635
636 smp_wmb();
637 if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
638 slot_cache, new_cache) == slot_cache) {
639 if (slot_cache)
640 call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
641 } else
642 ghes_estatus_cache_free(new_cache);
643 rcu_read_unlock();
644}
645
646static int ghes_proc(struct ghes *ghes)
647{
648 int rc;
649
650 rc = ghes_read_estatus(ghes, 0);
651 if (rc)
652 goto out;
653 if (!ghes_estatus_cached(ghes->estatus)) {
654 if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
655 ghes_estatus_cache_add(ghes->generic, ghes->estatus);
656 }
657 ghes_do_proc(ghes, ghes->estatus);
658out:
659 ghes_clear_estatus(ghes);
660 return 0;
661}
662
663static void ghes_add_timer(struct ghes *ghes)
664{
665 struct acpi_hest_generic *g = ghes->generic;
666 unsigned long expire;
667
668 if (!g->notify.poll_interval) {
669 pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
670 g->header.source_id);
671 return;
672 }
673 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
674 ghes->timer.expires = round_jiffies_relative(expire);
675 add_timer(&ghes->timer);
676}
677
678static void ghes_poll_func(unsigned long data)
679{
680 struct ghes *ghes = (void *)data;
681
682 ghes_proc(ghes);
683 if (!(ghes->flags & GHES_EXITING))
684 ghes_add_timer(ghes);
685}
686
687static irqreturn_t ghes_irq_func(int irq, void *data)
688{
689 struct ghes *ghes = data;
690 int rc;
691
692 rc = ghes_proc(ghes);
693 if (rc)
694 return IRQ_NONE;
695
696 return IRQ_HANDLED;
697}
698
699static int ghes_notify_sci(struct notifier_block *this,
700 unsigned long event, void *data)
701{
702 struct ghes *ghes;
703 int ret = NOTIFY_DONE;
704
705 rcu_read_lock();
706 list_for_each_entry_rcu(ghes, &ghes_sci, list) {
707 if (!ghes_proc(ghes))
708 ret = NOTIFY_OK;
709 }
710 rcu_read_unlock();
711
712 return ret;
713}
714
715static struct llist_node *llist_nodes_reverse(struct llist_node *llnode)
716{
717 struct llist_node *next, *tail = NULL;
718
719 while (llnode) {
720 next = llnode->next;
721 llnode->next = tail;
722 tail = llnode;
723 llnode = next;
724 }
725
726 return tail;
727}
728
729static void ghes_proc_in_irq(struct irq_work *irq_work)
730{
731 struct llist_node *llnode, *next;
732 struct ghes_estatus_node *estatus_node;
733 struct acpi_hest_generic *generic;
734 struct acpi_hest_generic_status *estatus;
735 u32 len, node_len;
736
737 llnode = llist_del_all(&ghes_estatus_llist);
738
739
740
741
742 llnode = llist_nodes_reverse(llnode);
743 while (llnode) {
744 next = llnode->next;
745 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
746 llnode);
747 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
748 len = apei_estatus_len(estatus);
749 node_len = GHES_ESTATUS_NODE_LEN(len);
750 ghes_do_proc(estatus_node->ghes, estatus);
751 if (!ghes_estatus_cached(estatus)) {
752 generic = estatus_node->generic;
753 if (ghes_print_estatus(NULL, generic, estatus))
754 ghes_estatus_cache_add(generic, estatus);
755 }
756 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
757 node_len);
758 llnode = next;
759 }
760}
761
762static void ghes_print_queued_estatus(void)
763{
764 struct llist_node *llnode;
765 struct ghes_estatus_node *estatus_node;
766 struct acpi_hest_generic *generic;
767 struct acpi_hest_generic_status *estatus;
768 u32 len, node_len;
769
770 llnode = llist_del_all(&ghes_estatus_llist);
771
772
773
774
775 llnode = llist_nodes_reverse(llnode);
776 while (llnode) {
777 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
778 llnode);
779 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
780 len = apei_estatus_len(estatus);
781 node_len = GHES_ESTATUS_NODE_LEN(len);
782 generic = estatus_node->generic;
783 ghes_print_estatus(NULL, generic, estatus);
784 llnode = llnode->next;
785 }
786}
787
788static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
789{
790 struct ghes *ghes, *ghes_global = NULL;
791 int sev, sev_global = -1;
792 int ret = NMI_DONE;
793
794 raw_spin_lock(&ghes_nmi_lock);
795 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
796 if (ghes_read_estatus(ghes, 1)) {
797 ghes_clear_estatus(ghes);
798 continue;
799 }
800 sev = ghes_severity(ghes->estatus->error_severity);
801 if (sev > sev_global) {
802 sev_global = sev;
803 ghes_global = ghes;
804 }
805 ret = NMI_HANDLED;
806 }
807
808 if (ret == NMI_DONE)
809 goto out;
810
811 if (sev_global >= GHES_SEV_PANIC) {
812 oops_begin();
813 ghes_print_queued_estatus();
814 __ghes_print_estatus(KERN_EMERG, ghes_global->generic,
815 ghes_global->estatus);
816
817 if (panic_timeout == 0)
818 panic_timeout = ghes_panic_timeout;
819 panic("Fatal hardware error!");
820 }
821
822 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
823#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
824 u32 len, node_len;
825 struct ghes_estatus_node *estatus_node;
826 struct acpi_hest_generic_status *estatus;
827#endif
828 if (!(ghes->flags & GHES_TO_CLEAR))
829 continue;
830#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
831 if (ghes_estatus_cached(ghes->estatus))
832 goto next;
833
834 len = apei_estatus_len(ghes->estatus);
835 node_len = GHES_ESTATUS_NODE_LEN(len);
836 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
837 node_len);
838 if (estatus_node) {
839 estatus_node->ghes = ghes;
840 estatus_node->generic = ghes->generic;
841 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
842 memcpy(estatus, ghes->estatus, len);
843 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
844 }
845next:
846#endif
847 ghes_clear_estatus(ghes);
848 }
849#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
850 irq_work_queue(&ghes_proc_irq_work);
851#endif
852
853out:
854 raw_spin_unlock(&ghes_nmi_lock);
855 return ret;
856}
857
858static struct notifier_block ghes_notifier_sci = {
859 .notifier_call = ghes_notify_sci,
860};
861
862static unsigned long ghes_esource_prealloc_size(
863 const struct acpi_hest_generic *generic)
864{
865 unsigned long block_length, prealloc_records, prealloc_size;
866
867 block_length = min_t(unsigned long, generic->error_block_length,
868 GHES_ESTATUS_MAX_SIZE);
869 prealloc_records = max_t(unsigned long,
870 generic->records_to_preallocate, 1);
871 prealloc_size = min_t(unsigned long, block_length * prealloc_records,
872 GHES_ESOURCE_PREALLOC_MAX_SIZE);
873
874 return prealloc_size;
875}
876
877static int ghes_probe(struct platform_device *ghes_dev)
878{
879 struct acpi_hest_generic *generic;
880 struct ghes *ghes = NULL;
881 unsigned long len;
882 int rc = -EINVAL;
883
884 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
885 if (!generic->enabled)
886 return -ENODEV;
887
888 switch (generic->notify.type) {
889 case ACPI_HEST_NOTIFY_POLLED:
890 case ACPI_HEST_NOTIFY_EXTERNAL:
891 case ACPI_HEST_NOTIFY_SCI:
892 case ACPI_HEST_NOTIFY_NMI:
893 break;
894 case ACPI_HEST_NOTIFY_LOCAL:
895 pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
896 generic->header.source_id);
897 goto err;
898 default:
899 pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
900 generic->notify.type, generic->header.source_id);
901 goto err;
902 }
903
904 rc = -EIO;
905 if (generic->error_block_length <
906 sizeof(struct acpi_hest_generic_status)) {
907 pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
908 generic->error_block_length,
909 generic->header.source_id);
910 goto err;
911 }
912 ghes = ghes_new(generic);
913 if (IS_ERR(ghes)) {
914 rc = PTR_ERR(ghes);
915 ghes = NULL;
916 goto err;
917 }
918
919 rc = ghes_edac_register(ghes, &ghes_dev->dev);
920 if (rc < 0)
921 goto err;
922
923 switch (generic->notify.type) {
924 case ACPI_HEST_NOTIFY_POLLED:
925 ghes->timer.function = ghes_poll_func;
926 ghes->timer.data = (unsigned long)ghes;
927 init_timer_deferrable(&ghes->timer);
928 ghes_add_timer(ghes);
929 break;
930 case ACPI_HEST_NOTIFY_EXTERNAL:
931
932 rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
933 if (rc) {
934 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
935 generic->header.source_id);
936 goto err_edac_unreg;
937 }
938 rc = request_irq(ghes->irq, ghes_irq_func, 0, "GHES IRQ", ghes);
939 if (rc) {
940 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
941 generic->header.source_id);
942 goto err_edac_unreg;
943 }
944 break;
945 case ACPI_HEST_NOTIFY_SCI:
946 mutex_lock(&ghes_list_mutex);
947 if (list_empty(&ghes_sci))
948 register_acpi_hed_notifier(&ghes_notifier_sci);
949 list_add_rcu(&ghes->list, &ghes_sci);
950 mutex_unlock(&ghes_list_mutex);
951 break;
952 case ACPI_HEST_NOTIFY_NMI:
953 len = ghes_esource_prealloc_size(generic);
954 ghes_estatus_pool_expand(len);
955 mutex_lock(&ghes_list_mutex);
956 if (list_empty(&ghes_nmi))
957 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0,
958 "ghes");
959 list_add_rcu(&ghes->list, &ghes_nmi);
960 mutex_unlock(&ghes_list_mutex);
961 break;
962 default:
963 BUG();
964 }
965 platform_set_drvdata(ghes_dev, ghes);
966
967 return 0;
968err_edac_unreg:
969 ghes_edac_unregister(ghes);
970err:
971 if (ghes) {
972 ghes_fini(ghes);
973 kfree(ghes);
974 }
975 return rc;
976}
977
978static int ghes_remove(struct platform_device *ghes_dev)
979{
980 struct ghes *ghes;
981 struct acpi_hest_generic *generic;
982 unsigned long len;
983
984 ghes = platform_get_drvdata(ghes_dev);
985 generic = ghes->generic;
986
987 ghes->flags |= GHES_EXITING;
988 switch (generic->notify.type) {
989 case ACPI_HEST_NOTIFY_POLLED:
990 del_timer_sync(&ghes->timer);
991 break;
992 case ACPI_HEST_NOTIFY_EXTERNAL:
993 free_irq(ghes->irq, ghes);
994 break;
995 case ACPI_HEST_NOTIFY_SCI:
996 mutex_lock(&ghes_list_mutex);
997 list_del_rcu(&ghes->list);
998 if (list_empty(&ghes_sci))
999 unregister_acpi_hed_notifier(&ghes_notifier_sci);
1000 mutex_unlock(&ghes_list_mutex);
1001 break;
1002 case ACPI_HEST_NOTIFY_NMI:
1003 mutex_lock(&ghes_list_mutex);
1004 list_del_rcu(&ghes->list);
1005 if (list_empty(&ghes_nmi))
1006 unregister_nmi_handler(NMI_LOCAL, "ghes");
1007 mutex_unlock(&ghes_list_mutex);
1008
1009
1010
1011
1012 synchronize_rcu();
1013 len = ghes_esource_prealloc_size(generic);
1014 ghes_estatus_pool_shrink(len);
1015 break;
1016 default:
1017 BUG();
1018 break;
1019 }
1020
1021 ghes_fini(ghes);
1022
1023 ghes_edac_unregister(ghes);
1024
1025 kfree(ghes);
1026
1027 platform_set_drvdata(ghes_dev, NULL);
1028
1029 return 0;
1030}
1031
1032static struct platform_driver ghes_platform_driver = {
1033 .driver = {
1034 .name = "GHES",
1035 .owner = THIS_MODULE,
1036 },
1037 .probe = ghes_probe,
1038 .remove = ghes_remove,
1039};
1040
1041static int __init ghes_init(void)
1042{
1043 int rc;
1044
1045 if (acpi_disabled)
1046 return -ENODEV;
1047
1048 if (hest_disable) {
1049 pr_info(GHES_PFX "HEST is not enabled!\n");
1050 return -EINVAL;
1051 }
1052
1053 if (ghes_disable) {
1054 pr_info(GHES_PFX "GHES is not enabled!\n");
1055 return -EINVAL;
1056 }
1057
1058 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1059
1060 rc = ghes_ioremap_init();
1061 if (rc)
1062 goto err;
1063
1064 rc = ghes_estatus_pool_init();
1065 if (rc)
1066 goto err_ioremap_exit;
1067
1068 rc = ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
1069 GHES_ESTATUS_CACHE_ALLOCED_MAX);
1070 if (rc)
1071 goto err_pool_exit;
1072
1073 rc = platform_driver_register(&ghes_platform_driver);
1074 if (rc)
1075 goto err_pool_exit;
1076
1077 rc = apei_osc_setup();
1078 if (rc == 0 && osc_sb_apei_support_acked)
1079 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1080 else if (rc == 0 && !osc_sb_apei_support_acked)
1081 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1082 else if (rc && osc_sb_apei_support_acked)
1083 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1084 else
1085 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1086
1087 return 0;
1088err_pool_exit:
1089 ghes_estatus_pool_exit();
1090err_ioremap_exit:
1091 ghes_ioremap_exit();
1092err:
1093 return rc;
1094}
1095
1096static void __exit ghes_exit(void)
1097{
1098 platform_driver_unregister(&ghes_platform_driver);
1099 ghes_estatus_pool_exit();
1100 ghes_ioremap_exit();
1101}
1102
1103module_init(ghes_init);
1104module_exit(ghes_exit);
1105
1106MODULE_AUTHOR("Huang Ying");
1107MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1108MODULE_LICENSE("GPL");
1109MODULE_ALIAS("platform:GHES");
1110
