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