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1/*
2 * APEI Generic Hardware Error Source support
3 *
4 * Generic Hardware Error Source provides a way to report platform
5 * hardware errors (such as that from chipset). It works in so called
6 * "Firmware First" mode, that is, hardware errors are reported to
7 * firmware firstly, then reported to Linux by firmware. This way,
8 * some non-standard hardware error registers or non-standard hardware
9 * link can be checked by firmware to produce more hardware error
10 * information for Linux.
11 *
12 * For more information about Generic Hardware Error Source, please
13 * refer to ACPI Specification version 4.0, section 17.3.2.6
14 *
15 * Copyright 2010,2011 Intel Corp.
16 * Author: Huang Ying <ying.huang@intel.com>
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License version
20 * 2 as published by the Free Software Foundation;
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 */
31
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#include <acpi/apei.h>
52#include <acpi/hed.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/* This is just an estimation for memory pool allocation */
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/* Prevent too many caches are allocated because of RCU */
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
87/*
88 * One struct ghes is created for each generic hardware error source.
89 * It provides the context for APEI hardware error timer/IRQ/SCI/NMI
90 * handler.
91 *
92 * estatus: memory buffer for error status block, allocated during
93 * HEST parsing.
94 */
95#define GHES_TO_CLEAR 0x0001
96#define GHES_EXITING 0x0002
97
98struct ghes {
99 struct acpi_hest_generic *generic;
100 struct acpi_hest_generic_status *estatus;
101 u64 buffer_paddr;
102 unsigned long flags;
103 union {
104 struct list_head list;
105 struct timer_list timer;
106 unsigned int irq;
107 };
108};
109
110struct ghes_estatus_node {
111 struct llist_node llnode;
112 struct acpi_hest_generic *generic;
113};
114
115struct ghes_estatus_cache {
116 u32 estatus_len;
117 atomic_t count;
118 struct acpi_hest_generic *generic;
119 unsigned long long time_in;
120 struct rcu_head rcu;
121};
122
123bool ghes_disable;
124module_param_named(disable, ghes_disable, bool, 0);
125
126static int ghes_panic_timeout __read_mostly = 30;
127
128/*
129 * All error sources notified with SCI shares one notifier function,
130 * so they need to be linked and checked one by one. This is applied
131 * to NMI too.
132 *
133 * RCU is used for these lists, so ghes_list_mutex is only used for
134 * list changing, not for traversing.
135 */
136static LIST_HEAD(ghes_sci);
137static LIST_HEAD(ghes_nmi);
138static DEFINE_MUTEX(ghes_list_mutex);
139
140/*
141 * NMI may be triggered on any CPU, so ghes_nmi_lock is used for
142 * mutual exclusion.
143 */
144static DEFINE_RAW_SPINLOCK(ghes_nmi_lock);
145
146/*
147 * Because the memory area used to transfer hardware error information
148 * from BIOS to Linux can be determined only in NMI, IRQ or timer
149 * handler, but general ioremap can not be used in atomic context, so
150 * a special version of atomic ioremap is implemented for that.
151 */
152
153/*
154 * Two virtual pages are used, one for NMI context, the other for
155 * IRQ/PROCESS context
156 */
157#define GHES_IOREMAP_PAGES 2
158#define GHES_IOREMAP_NMI_PAGE(base) (base)
159#define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE)
160
161/* virtual memory area for atomic ioremap */
162static struct vm_struct *ghes_ioremap_area;
163/*
164 * These 2 spinlock is used to prevent atomic ioremap virtual memory
165 * area from being mapped simultaneously.
166 */
167static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
168static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
169
170/*
171 * printk is not safe in NMI context. So in NMI handler, we allocate
172 * required memory from lock-less memory allocator
173 * (ghes_estatus_pool), save estatus into it, put them into lock-less
174 * list (ghes_estatus_llist), then delay printk into IRQ context via
175 * irq_work (ghes_proc_irq_work). ghes_estatus_size_request record
176 * required pool size by all NMI error source.
177 */
178static struct gen_pool *ghes_estatus_pool;
179static unsigned long ghes_estatus_pool_size_request;
180static struct llist_head ghes_estatus_llist;
181static struct irq_work ghes_proc_irq_work;
182
183struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
184static atomic_t ghes_estatus_cache_alloced;
185
186static int ghes_ioremap_init(void)
187{
188 ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
189 VM_IOREMAP, VMALLOC_START, VMALLOC_END);
190 if (!ghes_ioremap_area) {
191 pr_err(GHES_PFX "Failed to allocate virtual memory area for atomic ioremap.\n");
192 return -ENOMEM;
193 }
194
195 return 0;
196}
197
198static void ghes_ioremap_exit(void)
199{
200 free_vm_area(ghes_ioremap_area);
201}
202
203static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
204{
205 unsigned long vaddr;
206
207 vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
208 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
209 pfn << PAGE_SHIFT, PAGE_KERNEL);
210
211 return (void __iomem *)vaddr;
212}
213
214static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
215{
216 unsigned long vaddr;
217
218 vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr);
219 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
220 pfn << PAGE_SHIFT, PAGE_KERNEL);
221
222 return (void __iomem *)vaddr;
223}
224
225static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)
226{
227 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
228 void *base = ghes_ioremap_area->addr;
229
230 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
231 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
232 __flush_tlb_one(vaddr);
233}
234
235static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
236{
237 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
238 void *base = ghes_ioremap_area->addr;
239
240 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
241 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
242 __flush_tlb_one(vaddr);
243}
244
245static int ghes_estatus_pool_init(void)
246{
247 ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
248 if (!ghes_estatus_pool)
249 return -ENOMEM;
250 return 0;
251}
252
253static void ghes_estatus_pool_free_chunk_page(struct gen_pool *pool,
254 struct gen_pool_chunk *chunk,
255 void *data)
256{
257 free_page(chunk->start_addr);
258}
259
260static void ghes_estatus_pool_exit(void)
261{
262 gen_pool_for_each_chunk(ghes_estatus_pool,
263 ghes_estatus_pool_free_chunk_page, NULL);
264 gen_pool_destroy(ghes_estatus_pool);
265}
266
267static int ghes_estatus_pool_expand(unsigned long len)
268{
269 unsigned long i, pages, size, addr;
270 int ret;
271
272 ghes_estatus_pool_size_request += PAGE_ALIGN(len);
273 size = gen_pool_size(ghes_estatus_pool);
274 if (size >= ghes_estatus_pool_size_request)
275 return 0;
276 pages = (ghes_estatus_pool_size_request - size) / PAGE_SIZE;
277 for (i = 0; i < pages; i++) {
278 addr = __get_free_page(GFP_KERNEL);
279 if (!addr)
280 return -ENOMEM;
281 ret = gen_pool_add(ghes_estatus_pool, addr, PAGE_SIZE, -1);
282 if (ret)
283 return ret;
284 }
285
286 return 0;
287}
288
289static void ghes_estatus_pool_shrink(unsigned long len)
290{
291 ghes_estatus_pool_size_request -= PAGE_ALIGN(len);
292}
293
294static struct ghes *ghes_new(struct acpi_hest_generic *generic)
295{
296 struct ghes *ghes;
297 unsigned int error_block_length;
298 int rc;
299
300 ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
301 if (!ghes)
302 return ERR_PTR(-ENOMEM);
303 ghes->generic = generic;
304 rc = apei_map_generic_address(&generic->error_status_address);
305 if (rc)
306 goto err_free;
307 error_block_length = generic->error_block_length;
308 if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
309 pr_warning(FW_WARN GHES_PFX
310 "Error status block length is too long: %u for "
311 "generic hardware error source: %d.\n",
312 error_block_length, generic->header.source_id);
313 error_block_length = GHES_ESTATUS_MAX_SIZE;
314 }
315 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
316 if (!ghes->estatus) {
317 rc = -ENOMEM;
318 goto err_unmap;
319 }
320
321 return ghes;
322
323err_unmap:
324 apei_unmap_generic_address(&generic->error_status_address);
325err_free:
326 kfree(ghes);
327 return ERR_PTR(rc);
328}
329
330static void ghes_fini(struct ghes *ghes)
331{
332 kfree(ghes->estatus);
333 apei_unmap_generic_address(&ghes->generic->error_status_address);
334}
335
336enum {
337 GHES_SEV_NO = 0x0,
338 GHES_SEV_CORRECTED = 0x1,
339 GHES_SEV_RECOVERABLE = 0x2,
340 GHES_SEV_PANIC = 0x3,
341};
342
343static inline int ghes_severity(int severity)
344{
345 switch (severity) {
346 case CPER_SEV_INFORMATIONAL:
347 return GHES_SEV_NO;
348 case CPER_SEV_CORRECTED:
349 return GHES_SEV_CORRECTED;
350 case CPER_SEV_RECOVERABLE:
351 return GHES_SEV_RECOVERABLE;
352 case CPER_SEV_FATAL:
353 return GHES_SEV_PANIC;
354 default:
355 /* Unknown, go panic */
356 return GHES_SEV_PANIC;
357 }
358}
359
360static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
361 int from_phys)
362{
363 void __iomem *vaddr;
364 unsigned long flags = 0;
365 int in_nmi = in_nmi();
366 u64 offset;
367 u32 trunk;
368
369 while (len > 0) {
370 offset = paddr - (paddr & PAGE_MASK);
371 if (in_nmi) {
372 raw_spin_lock(&ghes_ioremap_lock_nmi);
373 vaddr = ghes_ioremap_pfn_nmi(paddr >> PAGE_SHIFT);
374 } else {
375 spin_lock_irqsave(&ghes_ioremap_lock_irq, flags);
376 vaddr = ghes_ioremap_pfn_irq(paddr >> PAGE_SHIFT);
377 }
378 trunk = PAGE_SIZE - offset;
379 trunk = min(trunk, len);
380 if (from_phys)
381 memcpy_fromio(buffer, vaddr + offset, trunk);
382 else
383 memcpy_toio(vaddr + offset, buffer, trunk);
384 len -= trunk;
385 paddr += trunk;
386 buffer += trunk;
387 if (in_nmi) {
388 ghes_iounmap_nmi(vaddr);
389 raw_spin_unlock(&ghes_ioremap_lock_nmi);
390 } else {
391 ghes_iounmap_irq(vaddr);
392 spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags);
393 }
394 }
395}
396
397static int ghes_read_estatus(struct ghes *ghes, int silent)
398{
399 struct acpi_hest_generic *g = ghes->generic;
400 u64 buf_paddr;
401 u32 len;
402 int rc;
403
404 rc = apei_read(&buf_paddr, &g->error_status_address);
405 if (rc) {
406 if (!silent && printk_ratelimit())
407 pr_warning(FW_WARN GHES_PFX
408"Failed to read error status block address for hardware error source: %d.\n",
409 g->header.source_id);
410 return -EIO;
411 }
412 if (!buf_paddr)
413 return -ENOENT;
414
415 ghes_copy_tofrom_phys(ghes->estatus, buf_paddr,
416 sizeof(*ghes->estatus), 1);
417 if (!ghes->estatus->block_status)
418 return -ENOENT;
419
420 ghes->buffer_paddr = buf_paddr;
421 ghes->flags |= GHES_TO_CLEAR;
422
423 rc = -EIO;
424 len = apei_estatus_len(ghes->estatus);
425 if (len < sizeof(*ghes->estatus))
426 goto err_read_block;
427 if (len > ghes->generic->error_block_length)
428 goto err_read_block;
429 if (apei_estatus_check_header(ghes->estatus))
430 goto err_read_block;
431 ghes_copy_tofrom_phys(ghes->estatus + 1,
432 buf_paddr + sizeof(*ghes->estatus),
433 len - sizeof(*ghes->estatus), 1);
434 if (apei_estatus_check(ghes->estatus))
435 goto err_read_block;
436 rc = 0;
437
438err_read_block:
439 if (rc && !silent && printk_ratelimit())
440 pr_warning(FW_WARN GHES_PFX
441 "Failed to read error status block!\n");
442 return rc;
443}
444
445static void ghes_clear_estatus(struct ghes *ghes)
446{
447 ghes->estatus->block_status = 0;
448 if (!(ghes->flags & GHES_TO_CLEAR))
449 return;
450 ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr,
451 sizeof(ghes->estatus->block_status), 0);
452 ghes->flags &= ~GHES_TO_CLEAR;
453}
454
455static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
456{
457 int sev, sec_sev;
458 struct acpi_hest_generic_data *gdata;
459
460 sev = ghes_severity(estatus->error_severity);
461 apei_estatus_for_each_section(estatus, gdata) {
462 sec_sev = ghes_severity(gdata->error_severity);
463 if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
464 CPER_SEC_PLATFORM_MEM)) {
465 struct cper_sec_mem_err *mem_err;
466 mem_err = (struct cper_sec_mem_err *)(gdata+1);
467#ifdef CONFIG_X86_MCE
468 apei_mce_report_mem_error(sev == GHES_SEV_CORRECTED,
469 mem_err);
470#endif
471#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
472 if (sev == GHES_SEV_RECOVERABLE &&
473 sec_sev == GHES_SEV_RECOVERABLE &&
474 mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS) {
475 unsigned long pfn;
476 pfn = mem_err->physical_addr >> PAGE_SHIFT;
477 memory_failure_queue(pfn, 0, 0);
478 }
479#endif
480 }
481#ifdef CONFIG_ACPI_APEI_PCIEAER
482 else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
483 CPER_SEC_PCIE)) {
484 struct cper_sec_pcie *pcie_err;
485 pcie_err = (struct cper_sec_pcie *)(gdata+1);
486 if (sev == GHES_SEV_RECOVERABLE &&
487 sec_sev == GHES_SEV_RECOVERABLE &&
488 pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
489 pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
490 unsigned int devfn;
491 int aer_severity;
492 devfn = PCI_DEVFN(pcie_err->device_id.device,
493 pcie_err->device_id.function);
494 aer_severity = cper_severity_to_aer(sev);
495 aer_recover_queue(pcie_err->device_id.segment,
496 pcie_err->device_id.bus,
497 devfn, aer_severity);
498 }
499
500 }
501#endif
502 }
503}
504
505static void __ghes_print_estatus(const char *pfx,
506 const struct acpi_hest_generic *generic,
507 const struct acpi_hest_generic_status *estatus)
508{
509 static atomic_t seqno;
510 unsigned int curr_seqno;
511 char pfx_seq[64];
512
513 if (pfx == NULL) {
514 if (ghes_severity(estatus->error_severity) <=
515 GHES_SEV_CORRECTED)
516 pfx = KERN_WARNING;
517 else
518 pfx = KERN_ERR;
519 }
520 curr_seqno = atomic_inc_return(&seqno);
521 snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
522 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
523 pfx_seq, generic->header.source_id);
524 apei_estatus_print(pfx_seq, estatus);
525}
526
527static int ghes_print_estatus(const char *pfx,
528 const struct acpi_hest_generic *generic,
529 const struct acpi_hest_generic_status *estatus)
530{
531 /* Not more than 2 messages every 5 seconds */
532 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
533 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
534 struct ratelimit_state *ratelimit;
535
536 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
537 ratelimit = &ratelimit_corrected;
538 else
539 ratelimit = &ratelimit_uncorrected;
540 if (__ratelimit(ratelimit)) {
541 __ghes_print_estatus(pfx, generic, estatus);
542 return 1;
543 }
544 return 0;
545}
546
547/*
548 * GHES error status reporting throttle, to report more kinds of
549 * errors, instead of just most frequently occurred errors.
550 */
551static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
552{
553 u32 len;
554 int i, cached = 0;
555 unsigned long long now;
556 struct ghes_estatus_cache *cache;
557 struct acpi_hest_generic_status *cache_estatus;
558
559 len = apei_estatus_len(estatus);
560 rcu_read_lock();
561 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
562 cache = rcu_dereference(ghes_estatus_caches[i]);
563 if (cache == NULL)
564 continue;
565 if (len != cache->estatus_len)
566 continue;
567 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
568 if (memcmp(estatus, cache_estatus, len))
569 continue;
570 atomic_inc(&cache->count);
571 now = sched_clock();
572 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
573 cached = 1;
574 break;
575 }
576 rcu_read_unlock();
577 return cached;
578}
579
580static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
581 struct acpi_hest_generic *generic,
582 struct acpi_hest_generic_status *estatus)
583{
584 int alloced;
585 u32 len, cache_len;
586 struct ghes_estatus_cache *cache;
587 struct acpi_hest_generic_status *cache_estatus;
588
589 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
590 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
591 atomic_dec(&ghes_estatus_cache_alloced);
592 return NULL;
593 }
594 len = apei_estatus_len(estatus);
595 cache_len = GHES_ESTATUS_CACHE_LEN(len);
596 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
597 if (!cache) {
598 atomic_dec(&ghes_estatus_cache_alloced);
599 return NULL;
600 }
601 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
602 memcpy(cache_estatus, estatus, len);
603 cache->estatus_len = len;
604 atomic_set(&cache->count, 0);
605 cache->generic = generic;
606 cache->time_in = sched_clock();
607 return cache;
608}
609
610static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
611{
612 u32 len;
613
614 len = apei_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
615 len = GHES_ESTATUS_CACHE_LEN(len);
616 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
617 atomic_dec(&ghes_estatus_cache_alloced);
618}
619
620static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
621{
622 struct ghes_estatus_cache *cache;
623
624 cache = container_of(head, struct ghes_estatus_cache, rcu);
625 ghes_estatus_cache_free(cache);
626}
627
628static void ghes_estatus_cache_add(
629 struct acpi_hest_generic *generic,
630 struct acpi_hest_generic_status *estatus)
631{
632 int i, slot = -1, count;
633 unsigned long long now, duration, period, max_period = 0;
634 struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
635
636 new_cache = ghes_estatus_cache_alloc(generic, estatus);
637 if (new_cache == NULL)
638 return;
639 rcu_read_lock();
640 now = sched_clock();
641 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
642 cache = rcu_dereference(ghes_estatus_caches[i]);
643 if (cache == NULL) {
644 slot = i;
645 slot_cache = NULL;
646 break;
647 }
648 duration = now - cache->time_in;
649 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
650 slot = i;
651 slot_cache = cache;
652 break;
653 }
654 count = atomic_read(&cache->count);
655 period = duration;
656 do_div(period, (count + 1));
657 if (period > max_period) {
658 max_period = period;
659 slot = i;
660 slot_cache = cache;
661 }
662 }
663 /* new_cache must be put into array after its contents are written */
664 smp_wmb();
665 if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
666 slot_cache, new_cache) == slot_cache) {
667 if (slot_cache)
668 call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
669 } else
670 ghes_estatus_cache_free(new_cache);
671 rcu_read_unlock();
672}
673
674static int ghes_proc(struct ghes *ghes)
675{
676 int rc;
677
678 rc = ghes_read_estatus(ghes, 0);
679 if (rc)
680 goto out;
681 if (!ghes_estatus_cached(ghes->estatus)) {
682 if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
683 ghes_estatus_cache_add(ghes->generic, ghes->estatus);
684 }
685 ghes_do_proc(ghes->estatus);
686out:
687 ghes_clear_estatus(ghes);
688 return 0;
689}
690
691static void ghes_add_timer(struct ghes *ghes)
692{
693 struct acpi_hest_generic *g = ghes->generic;
694 unsigned long expire;
695
696 if (!g->notify.poll_interval) {
697 pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
698 g->header.source_id);
699 return;
700 }
701 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
702 ghes->timer.expires = round_jiffies_relative(expire);
703 add_timer(&ghes->timer);
704}
705
706static void ghes_poll_func(unsigned long data)
707{
708 struct ghes *ghes = (void *)data;
709
710 ghes_proc(ghes);
711 if (!(ghes->flags & GHES_EXITING))
712 ghes_add_timer(ghes);
713}
714
715static irqreturn_t ghes_irq_func(int irq, void *data)
716{
717 struct ghes *ghes = data;
718 int rc;
719
720 rc = ghes_proc(ghes);
721 if (rc)
722 return IRQ_NONE;
723
724 return IRQ_HANDLED;
725}
726
727static int ghes_notify_sci(struct notifier_block *this,
728 unsigned long event, void *data)
729{
730 struct ghes *ghes;
731 int ret = NOTIFY_DONE;
732
733 rcu_read_lock();
734 list_for_each_entry_rcu(ghes, &ghes_sci, list) {
735 if (!ghes_proc(ghes))
736 ret = NOTIFY_OK;
737 }
738 rcu_read_unlock();
739
740 return ret;
741}
742
743static struct llist_node *llist_nodes_reverse(struct llist_node *llnode)
744{
745 struct llist_node *next, *tail = NULL;
746
747 while (llnode) {
748 next = llnode->next;
749 llnode->next = tail;
750 tail = llnode;
751 llnode = next;
752 }
753
754 return tail;
755}
756
757static void ghes_proc_in_irq(struct irq_work *irq_work)
758{
759 struct llist_node *llnode, *next;
760 struct ghes_estatus_node *estatus_node;
761 struct acpi_hest_generic *generic;
762 struct acpi_hest_generic_status *estatus;
763 u32 len, node_len;
764
765 llnode = llist_del_all(&ghes_estatus_llist);
766 /*
767 * Because the time order of estatus in list is reversed,
768 * revert it back to proper order.
769 */
770 llnode = llist_nodes_reverse(llnode);
771 while (llnode) {
772 next = llnode->next;
773 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
774 llnode);
775 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
776 len = apei_estatus_len(estatus);
777 node_len = GHES_ESTATUS_NODE_LEN(len);
778 ghes_do_proc(estatus);
779 if (!ghes_estatus_cached(estatus)) {
780 generic = estatus_node->generic;
781 if (ghes_print_estatus(NULL, generic, estatus))
782 ghes_estatus_cache_add(generic, estatus);
783 }
784 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
785 node_len);
786 llnode = next;
787 }
788}
789
790static void ghes_print_queued_estatus(void)
791{
792 struct llist_node *llnode;
793 struct ghes_estatus_node *estatus_node;
794 struct acpi_hest_generic *generic;
795 struct acpi_hest_generic_status *estatus;
796 u32 len, node_len;
797
798 llnode = llist_del_all(&ghes_estatus_llist);
799 /*
800 * Because the time order of estatus in list is reversed,
801 * revert it back to proper order.
802 */
803 llnode = llist_nodes_reverse(llnode);
804 while (llnode) {
805 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
806 llnode);
807 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
808 len = apei_estatus_len(estatus);
809 node_len = GHES_ESTATUS_NODE_LEN(len);
810 generic = estatus_node->generic;
811 ghes_print_estatus(NULL, generic, estatus);
812 llnode = llnode->next;
813 }
814}
815
816static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
817{
818 struct ghes *ghes, *ghes_global = NULL;
819 int sev, sev_global = -1;
820 int ret = NMI_DONE;
821
822 raw_spin_lock(&ghes_nmi_lock);
823 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
824 if (ghes_read_estatus(ghes, 1)) {
825 ghes_clear_estatus(ghes);
826 continue;
827 }
828 sev = ghes_severity(ghes->estatus->error_severity);
829 if (sev > sev_global) {
830 sev_global = sev;
831 ghes_global = ghes;
832 }
833 ret = NMI_HANDLED;
834 }
835
836 if (ret == NMI_DONE)
837 goto out;
838
839 if (sev_global >= GHES_SEV_PANIC) {
840 oops_begin();
841 ghes_print_queued_estatus();
842 __ghes_print_estatus(KERN_EMERG, ghes_global->generic,
843 ghes_global->estatus);
844 /* reboot to log the error! */
845 if (panic_timeout == 0)
846 panic_timeout = ghes_panic_timeout;
847 panic("Fatal hardware error!");
848 }
849
850 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
851#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
852 u32 len, node_len;
853 struct ghes_estatus_node *estatus_node;
854 struct acpi_hest_generic_status *estatus;
855#endif
856 if (!(ghes->flags & GHES_TO_CLEAR))
857 continue;
858#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
859 if (ghes_estatus_cached(ghes->estatus))
860 goto next;
861 /* Save estatus for further processing in IRQ context */
862 len = apei_estatus_len(ghes->estatus);
863 node_len = GHES_ESTATUS_NODE_LEN(len);
864 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
865 node_len);
866 if (estatus_node) {
867 estatus_node->generic = ghes->generic;
868 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
869 memcpy(estatus, ghes->estatus, len);
870 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
871 }
872next:
873#endif
874 ghes_clear_estatus(ghes);
875 }
876#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
877 irq_work_queue(&ghes_proc_irq_work);
878#endif
879
880out:
881 raw_spin_unlock(&ghes_nmi_lock);
882 return ret;
883}
884
885static struct notifier_block ghes_notifier_sci = {
886 .notifier_call = ghes_notify_sci,
887};
888
889static unsigned long ghes_esource_prealloc_size(
890 const struct acpi_hest_generic *generic)
891{
892 unsigned long block_length, prealloc_records, prealloc_size;
893
894 block_length = min_t(unsigned long, generic->error_block_length,
895 GHES_ESTATUS_MAX_SIZE);
896 prealloc_records = max_t(unsigned long,
897 generic->records_to_preallocate, 1);
898 prealloc_size = min_t(unsigned long, block_length * prealloc_records,
899 GHES_ESOURCE_PREALLOC_MAX_SIZE);
900
901 return prealloc_size;
902}
903
904static int __devinit ghes_probe(struct platform_device *ghes_dev)
905{
906 struct acpi_hest_generic *generic;
907 struct ghes *ghes = NULL;
908 unsigned long len;
909 int rc = -EINVAL;
910
911 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
912 if (!generic->enabled)
913 return -ENODEV;
914
915 switch (generic->notify.type) {
916 case ACPI_HEST_NOTIFY_POLLED:
917 case ACPI_HEST_NOTIFY_EXTERNAL:
918 case ACPI_HEST_NOTIFY_SCI:
919 case ACPI_HEST_NOTIFY_NMI:
920 break;
921 case ACPI_HEST_NOTIFY_LOCAL:
922 pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
923 generic->header.source_id);
924 goto err;
925 default:
926 pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
927 generic->notify.type, generic->header.source_id);
928 goto err;
929 }
930
931 rc = -EIO;
932 if (generic->error_block_length <
933 sizeof(struct acpi_hest_generic_status)) {
934 pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
935 generic->error_block_length,
936 generic->header.source_id);
937 goto err;
938 }
939 ghes = ghes_new(generic);
940 if (IS_ERR(ghes)) {
941 rc = PTR_ERR(ghes);
942 ghes = NULL;
943 goto err;
944 }
945 switch (generic->notify.type) {
946 case ACPI_HEST_NOTIFY_POLLED:
947 ghes->timer.function = ghes_poll_func;
948 ghes->timer.data = (unsigned long)ghes;
949 init_timer_deferrable(&ghes->timer);
950 ghes_add_timer(ghes);
951 break;
952 case ACPI_HEST_NOTIFY_EXTERNAL:
953 /* External interrupt vector is GSI */
954 if (acpi_gsi_to_irq(generic->notify.vector, &ghes->irq)) {
955 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
956 generic->header.source_id);
957 goto err;
958 }
959 if (request_irq(ghes->irq, ghes_irq_func,
960 0, "GHES IRQ", ghes)) {
961 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
962 generic->header.source_id);
963 goto err;
964 }
965 break;
966 case ACPI_HEST_NOTIFY_SCI:
967 mutex_lock(&ghes_list_mutex);
968 if (list_empty(&ghes_sci))
969 register_acpi_hed_notifier(&ghes_notifier_sci);
970 list_add_rcu(&ghes->list, &ghes_sci);
971 mutex_unlock(&ghes_list_mutex);
972 break;
973 case ACPI_HEST_NOTIFY_NMI:
974 len = ghes_esource_prealloc_size(generic);
975 ghes_estatus_pool_expand(len);
976 mutex_lock(&ghes_list_mutex);
977 if (list_empty(&ghes_nmi))
978 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0,
979 "ghes");
980 list_add_rcu(&ghes->list, &ghes_nmi);
981 mutex_unlock(&ghes_list_mutex);
982 break;
983 default:
984 BUG();
985 }
986 platform_set_drvdata(ghes_dev, ghes);
987
988 return 0;
989err:
990 if (ghes) {
991 ghes_fini(ghes);
992 kfree(ghes);
993 }
994 return rc;
995}
996
997static int __devexit ghes_remove(struct platform_device *ghes_dev)
998{
999 struct ghes *ghes;
1000 struct acpi_hest_generic *generic;
1001 unsigned long len;
1002
1003 ghes = platform_get_drvdata(ghes_dev);
1004 generic = ghes->generic;
1005
1006 ghes->flags |= GHES_EXITING;
1007 switch (generic->notify.type) {
1008 case ACPI_HEST_NOTIFY_POLLED:
1009 del_timer_sync(&ghes->timer);
1010 break;
1011 case ACPI_HEST_NOTIFY_EXTERNAL:
1012 free_irq(ghes->irq, ghes);
1013 break;
1014 case ACPI_HEST_NOTIFY_SCI:
1015 mutex_lock(&ghes_list_mutex);
1016 list_del_rcu(&ghes->list);
1017 if (list_empty(&ghes_sci))
1018 unregister_acpi_hed_notifier(&ghes_notifier_sci);
1019 mutex_unlock(&ghes_list_mutex);
1020 break;
1021 case ACPI_HEST_NOTIFY_NMI:
1022 mutex_lock(&ghes_list_mutex);
1023 list_del_rcu(&ghes->list);
1024 if (list_empty(&ghes_nmi))
1025 unregister_nmi_handler(NMI_LOCAL, "ghes");
1026 mutex_unlock(&ghes_list_mutex);
1027 /*
1028 * To synchronize with NMI handler, ghes can only be
1029 * freed after NMI handler finishes.
1030 */
1031 synchronize_rcu();
1032 len = ghes_esource_prealloc_size(generic);
1033 ghes_estatus_pool_shrink(len);
1034 break;
1035 default:
1036 BUG();
1037 break;
1038 }
1039
1040 ghes_fini(ghes);
1041 kfree(ghes);
1042
1043 platform_set_drvdata(ghes_dev, NULL);
1044
1045 return 0;
1046}
1047
1048static struct platform_driver ghes_platform_driver = {
1049 .driver = {
1050 .name = "GHES",
1051 .owner = THIS_MODULE,
1052 },
1053 .probe = ghes_probe,
1054 .remove = ghes_remove,
1055};
1056
1057static int __init ghes_init(void)
1058{
1059 int rc;
1060
1061 if (acpi_disabled)
1062 return -ENODEV;
1063
1064 if (hest_disable) {
1065 pr_info(GHES_PFX "HEST is not enabled!\n");
1066 return -EINVAL;
1067 }
1068
1069 if (ghes_disable) {
1070 pr_info(GHES_PFX "GHES is not enabled!\n");
1071 return -EINVAL;
1072 }
1073
1074 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1075
1076 rc = ghes_ioremap_init();
1077 if (rc)
1078 goto err;
1079
1080 rc = ghes_estatus_pool_init();
1081 if (rc)
1082 goto err_ioremap_exit;
1083
1084 rc = ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
1085 GHES_ESTATUS_CACHE_ALLOCED_MAX);
1086 if (rc)
1087 goto err_pool_exit;
1088
1089 rc = platform_driver_register(&ghes_platform_driver);
1090 if (rc)
1091 goto err_pool_exit;
1092
1093 rc = apei_osc_setup();
1094 if (rc == 0 && osc_sb_apei_support_acked)
1095 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1096 else if (rc == 0 && !osc_sb_apei_support_acked)
1097 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1098 else if (rc && osc_sb_apei_support_acked)
1099 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1100 else
1101 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1102
1103 return 0;
1104err_pool_exit:
1105 ghes_estatus_pool_exit();
1106err_ioremap_exit:
1107 ghes_ioremap_exit();
1108err:
1109 return rc;
1110}
1111
1112static void __exit ghes_exit(void)
1113{
1114 platform_driver_unregister(&ghes_platform_driver);
1115 ghes_estatus_pool_exit();
1116 ghes_ioremap_exit();
1117}
1118
1119module_init(ghes_init);
1120module_exit(ghes_exit);
1121
1122MODULE_AUTHOR("Huang Ying");
1123MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1124MODULE_LICENSE("GPL");
1125MODULE_ALIAS("platform:GHES");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * APEI Generic Hardware Error Source support
4 *
5 * Generic Hardware Error Source provides a way to report platform
6 * hardware errors (such as that from chipset). It works in so called
7 * "Firmware First" mode, that is, hardware errors are reported to
8 * firmware firstly, then reported to Linux by firmware. This way,
9 * some non-standard hardware error registers or non-standard hardware
10 * link can be checked by firmware to produce more hardware error
11 * information for Linux.
12 *
13 * For more information about Generic Hardware Error Source, please
14 * refer to ACPI Specification version 4.0, section 17.3.2.6
15 *
16 * Copyright 2010,2011 Intel Corp.
17 * Author: Huang Ying <ying.huang@intel.com>
18 */
19
20#include <linux/arm_sdei.h>
21#include <linux/kernel.h>
22#include <linux/moduleparam.h>
23#include <linux/init.h>
24#include <linux/acpi.h>
25#include <linux/io.h>
26#include <linux/interrupt.h>
27#include <linux/timer.h>
28#include <linux/cper.h>
29#include <linux/platform_device.h>
30#include <linux/mutex.h>
31#include <linux/ratelimit.h>
32#include <linux/vmalloc.h>
33#include <linux/irq_work.h>
34#include <linux/llist.h>
35#include <linux/genalloc.h>
36#include <linux/pci.h>
37#include <linux/pfn.h>
38#include <linux/aer.h>
39#include <linux/nmi.h>
40#include <linux/sched/clock.h>
41#include <linux/uuid.h>
42#include <linux/ras.h>
43#include <linux/task_work.h>
44
45#include <acpi/actbl1.h>
46#include <acpi/ghes.h>
47#include <acpi/apei.h>
48#include <asm/fixmap.h>
49#include <asm/tlbflush.h>
50#include <ras/ras_event.h>
51
52#include "apei-internal.h"
53
54#define GHES_PFX "GHES: "
55
56#define GHES_ESTATUS_MAX_SIZE 65536
57#define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
58
59#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
60
61/* This is just an estimation for memory pool allocation */
62#define GHES_ESTATUS_CACHE_AVG_SIZE 512
63
64#define GHES_ESTATUS_CACHES_SIZE 4
65
66#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
67/* Prevent too many caches are allocated because of RCU */
68#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
69
70#define GHES_ESTATUS_CACHE_LEN(estatus_len) \
71 (sizeof(struct ghes_estatus_cache) + (estatus_len))
72#define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
73 ((struct acpi_hest_generic_status *) \
74 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
75
76#define GHES_ESTATUS_NODE_LEN(estatus_len) \
77 (sizeof(struct ghes_estatus_node) + (estatus_len))
78#define GHES_ESTATUS_FROM_NODE(estatus_node) \
79 ((struct acpi_hest_generic_status *) \
80 ((struct ghes_estatus_node *)(estatus_node) + 1))
81
82#define GHES_VENDOR_ENTRY_LEN(gdata_len) \
83 (sizeof(struct ghes_vendor_record_entry) + (gdata_len))
84#define GHES_GDATA_FROM_VENDOR_ENTRY(vendor_entry) \
85 ((struct acpi_hest_generic_data *) \
86 ((struct ghes_vendor_record_entry *)(vendor_entry) + 1))
87
88/*
89 * NMI-like notifications vary by architecture, before the compiler can prune
90 * unused static functions it needs a value for these enums.
91 */
92#ifndef CONFIG_ARM_SDE_INTERFACE
93#define FIX_APEI_GHES_SDEI_NORMAL __end_of_fixed_addresses
94#define FIX_APEI_GHES_SDEI_CRITICAL __end_of_fixed_addresses
95#endif
96
97static ATOMIC_NOTIFIER_HEAD(ghes_report_chain);
98
99static inline bool is_hest_type_generic_v2(struct ghes *ghes)
100{
101 return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
102}
103
104/*
105 * A platform may describe one error source for the handling of synchronous
106 * errors (e.g. MCE or SEA), or for handling asynchronous errors (e.g. SCI
107 * or External Interrupt). On x86, the HEST notifications are always
108 * asynchronous, so only SEA on ARM is delivered as a synchronous
109 * notification.
110 */
111static inline bool is_hest_sync_notify(struct ghes *ghes)
112{
113 u8 notify_type = ghes->generic->notify.type;
114
115 return notify_type == ACPI_HEST_NOTIFY_SEA;
116}
117
118/*
119 * This driver isn't really modular, however for the time being,
120 * continuing to use module_param is the easiest way to remain
121 * compatible with existing boot arg use cases.
122 */
123bool ghes_disable;
124module_param_named(disable, ghes_disable, bool, 0);
125
126/*
127 * "ghes.edac_force_enable" forcibly enables ghes_edac and skips the platform
128 * check.
129 */
130static bool ghes_edac_force_enable;
131module_param_named(edac_force_enable, ghes_edac_force_enable, bool, 0);
132
133/*
134 * All error sources notified with HED (Hardware Error Device) share a
135 * single notifier callback, so they need to be linked and checked one
136 * by one. This holds true for NMI too.
137 *
138 * RCU is used for these lists, so ghes_list_mutex is only used for
139 * list changing, not for traversing.
140 */
141static LIST_HEAD(ghes_hed);
142static DEFINE_MUTEX(ghes_list_mutex);
143
144/*
145 * A list of GHES devices which are given to the corresponding EDAC driver
146 * ghes_edac for further use.
147 */
148static LIST_HEAD(ghes_devs);
149static DEFINE_MUTEX(ghes_devs_mutex);
150
151/*
152 * Because the memory area used to transfer hardware error information
153 * from BIOS to Linux can be determined only in NMI, IRQ or timer
154 * handler, but general ioremap can not be used in atomic context, so
155 * the fixmap is used instead.
156 *
157 * This spinlock is used to prevent the fixmap entry from being used
158 * simultaneously.
159 */
160static DEFINE_SPINLOCK(ghes_notify_lock_irq);
161
162struct ghes_vendor_record_entry {
163 struct work_struct work;
164 int error_severity;
165 char vendor_record[];
166};
167
168static struct gen_pool *ghes_estatus_pool;
169
170static struct ghes_estatus_cache __rcu *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
171static atomic_t ghes_estatus_cache_alloced;
172
173static int ghes_panic_timeout __read_mostly = 30;
174
175static void __iomem *ghes_map(u64 pfn, enum fixed_addresses fixmap_idx)
176{
177 phys_addr_t paddr;
178 pgprot_t prot;
179
180 paddr = PFN_PHYS(pfn);
181 prot = arch_apei_get_mem_attribute(paddr);
182 __set_fixmap(fixmap_idx, paddr, prot);
183
184 return (void __iomem *) __fix_to_virt(fixmap_idx);
185}
186
187static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
188{
189 int _idx = virt_to_fix((unsigned long)vaddr);
190
191 WARN_ON_ONCE(fixmap_idx != _idx);
192 clear_fixmap(fixmap_idx);
193}
194
195int ghes_estatus_pool_init(unsigned int num_ghes)
196{
197 unsigned long addr, len;
198 int rc;
199
200 ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
201 if (!ghes_estatus_pool)
202 return -ENOMEM;
203
204 len = GHES_ESTATUS_CACHE_AVG_SIZE * GHES_ESTATUS_CACHE_ALLOCED_MAX;
205 len += (num_ghes * GHES_ESOURCE_PREALLOC_MAX_SIZE);
206
207 addr = (unsigned long)vmalloc(PAGE_ALIGN(len));
208 if (!addr)
209 goto err_pool_alloc;
210
211 rc = gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
212 if (rc)
213 goto err_pool_add;
214
215 return 0;
216
217err_pool_add:
218 vfree((void *)addr);
219
220err_pool_alloc:
221 gen_pool_destroy(ghes_estatus_pool);
222
223 return -ENOMEM;
224}
225
226/**
227 * ghes_estatus_pool_region_free - free previously allocated memory
228 * from the ghes_estatus_pool.
229 * @addr: address of memory to free.
230 * @size: size of memory to free.
231 *
232 * Returns none.
233 */
234void ghes_estatus_pool_region_free(unsigned long addr, u32 size)
235{
236 gen_pool_free(ghes_estatus_pool, addr, size);
237}
238EXPORT_SYMBOL_GPL(ghes_estatus_pool_region_free);
239
240static int map_gen_v2(struct ghes *ghes)
241{
242 return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
243}
244
245static void unmap_gen_v2(struct ghes *ghes)
246{
247 apei_unmap_generic_address(&ghes->generic_v2->read_ack_register);
248}
249
250static void ghes_ack_error(struct acpi_hest_generic_v2 *gv2)
251{
252 int rc;
253 u64 val = 0;
254
255 rc = apei_read(&val, &gv2->read_ack_register);
256 if (rc)
257 return;
258
259 val &= gv2->read_ack_preserve << gv2->read_ack_register.bit_offset;
260 val |= gv2->read_ack_write << gv2->read_ack_register.bit_offset;
261
262 apei_write(val, &gv2->read_ack_register);
263}
264
265static struct ghes *ghes_new(struct acpi_hest_generic *generic)
266{
267 struct ghes *ghes;
268 unsigned int error_block_length;
269 int rc;
270
271 ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
272 if (!ghes)
273 return ERR_PTR(-ENOMEM);
274
275 ghes->generic = generic;
276 if (is_hest_type_generic_v2(ghes)) {
277 rc = map_gen_v2(ghes);
278 if (rc)
279 goto err_free;
280 }
281
282 rc = apei_map_generic_address(&generic->error_status_address);
283 if (rc)
284 goto err_unmap_read_ack_addr;
285 error_block_length = generic->error_block_length;
286 if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
287 pr_warn(FW_WARN GHES_PFX
288 "Error status block length is too long: %u for "
289 "generic hardware error source: %d.\n",
290 error_block_length, generic->header.source_id);
291 error_block_length = GHES_ESTATUS_MAX_SIZE;
292 }
293 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
294 if (!ghes->estatus) {
295 rc = -ENOMEM;
296 goto err_unmap_status_addr;
297 }
298
299 return ghes;
300
301err_unmap_status_addr:
302 apei_unmap_generic_address(&generic->error_status_address);
303err_unmap_read_ack_addr:
304 if (is_hest_type_generic_v2(ghes))
305 unmap_gen_v2(ghes);
306err_free:
307 kfree(ghes);
308 return ERR_PTR(rc);
309}
310
311static void ghes_fini(struct ghes *ghes)
312{
313 kfree(ghes->estatus);
314 apei_unmap_generic_address(&ghes->generic->error_status_address);
315 if (is_hest_type_generic_v2(ghes))
316 unmap_gen_v2(ghes);
317}
318
319static inline int ghes_severity(int severity)
320{
321 switch (severity) {
322 case CPER_SEV_INFORMATIONAL:
323 return GHES_SEV_NO;
324 case CPER_SEV_CORRECTED:
325 return GHES_SEV_CORRECTED;
326 case CPER_SEV_RECOVERABLE:
327 return GHES_SEV_RECOVERABLE;
328 case CPER_SEV_FATAL:
329 return GHES_SEV_PANIC;
330 default:
331 /* Unknown, go panic */
332 return GHES_SEV_PANIC;
333 }
334}
335
336static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
337 int from_phys,
338 enum fixed_addresses fixmap_idx)
339{
340 void __iomem *vaddr;
341 u64 offset;
342 u32 trunk;
343
344 while (len > 0) {
345 offset = paddr - (paddr & PAGE_MASK);
346 vaddr = ghes_map(PHYS_PFN(paddr), fixmap_idx);
347 trunk = PAGE_SIZE - offset;
348 trunk = min(trunk, len);
349 if (from_phys)
350 memcpy_fromio(buffer, vaddr + offset, trunk);
351 else
352 memcpy_toio(vaddr + offset, buffer, trunk);
353 len -= trunk;
354 paddr += trunk;
355 buffer += trunk;
356 ghes_unmap(vaddr, fixmap_idx);
357 }
358}
359
360/* Check the top-level record header has an appropriate size. */
361static int __ghes_check_estatus(struct ghes *ghes,
362 struct acpi_hest_generic_status *estatus)
363{
364 u32 len = cper_estatus_len(estatus);
365
366 if (len < sizeof(*estatus)) {
367 pr_warn_ratelimited(FW_WARN GHES_PFX "Truncated error status block!\n");
368 return -EIO;
369 }
370
371 if (len > ghes->generic->error_block_length) {
372 pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid error status block length!\n");
373 return -EIO;
374 }
375
376 if (cper_estatus_check_header(estatus)) {
377 pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid CPER header!\n");
378 return -EIO;
379 }
380
381 return 0;
382}
383
384/* Read the CPER block, returning its address, and header in estatus. */
385static int __ghes_peek_estatus(struct ghes *ghes,
386 struct acpi_hest_generic_status *estatus,
387 u64 *buf_paddr, enum fixed_addresses fixmap_idx)
388{
389 struct acpi_hest_generic *g = ghes->generic;
390 int rc;
391
392 rc = apei_read(buf_paddr, &g->error_status_address);
393 if (rc) {
394 *buf_paddr = 0;
395 pr_warn_ratelimited(FW_WARN GHES_PFX
396"Failed to read error status block address for hardware error source: %d.\n",
397 g->header.source_id);
398 return -EIO;
399 }
400 if (!*buf_paddr)
401 return -ENOENT;
402
403 ghes_copy_tofrom_phys(estatus, *buf_paddr, sizeof(*estatus), 1,
404 fixmap_idx);
405 if (!estatus->block_status) {
406 *buf_paddr = 0;
407 return -ENOENT;
408 }
409
410 return 0;
411}
412
413static int __ghes_read_estatus(struct acpi_hest_generic_status *estatus,
414 u64 buf_paddr, enum fixed_addresses fixmap_idx,
415 size_t buf_len)
416{
417 ghes_copy_tofrom_phys(estatus, buf_paddr, buf_len, 1, fixmap_idx);
418 if (cper_estatus_check(estatus)) {
419 pr_warn_ratelimited(FW_WARN GHES_PFX
420 "Failed to read error status block!\n");
421 return -EIO;
422 }
423
424 return 0;
425}
426
427static int ghes_read_estatus(struct ghes *ghes,
428 struct acpi_hest_generic_status *estatus,
429 u64 *buf_paddr, enum fixed_addresses fixmap_idx)
430{
431 int rc;
432
433 rc = __ghes_peek_estatus(ghes, estatus, buf_paddr, fixmap_idx);
434 if (rc)
435 return rc;
436
437 rc = __ghes_check_estatus(ghes, estatus);
438 if (rc)
439 return rc;
440
441 return __ghes_read_estatus(estatus, *buf_paddr, fixmap_idx,
442 cper_estatus_len(estatus));
443}
444
445static void ghes_clear_estatus(struct ghes *ghes,
446 struct acpi_hest_generic_status *estatus,
447 u64 buf_paddr, enum fixed_addresses fixmap_idx)
448{
449 estatus->block_status = 0;
450
451 if (!buf_paddr)
452 return;
453
454 ghes_copy_tofrom_phys(estatus, buf_paddr,
455 sizeof(estatus->block_status), 0,
456 fixmap_idx);
457
458 /*
459 * GHESv2 type HEST entries introduce support for error acknowledgment,
460 * so only acknowledge the error if this support is present.
461 */
462 if (is_hest_type_generic_v2(ghes))
463 ghes_ack_error(ghes->generic_v2);
464}
465
466/*
467 * Called as task_work before returning to user-space.
468 * Ensure any queued work has been done before we return to the context that
469 * triggered the notification.
470 */
471static void ghes_kick_task_work(struct callback_head *head)
472{
473 struct acpi_hest_generic_status *estatus;
474 struct ghes_estatus_node *estatus_node;
475 u32 node_len;
476
477 estatus_node = container_of(head, struct ghes_estatus_node, task_work);
478 if (IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
479 memory_failure_queue_kick(estatus_node->task_work_cpu);
480
481 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
482 node_len = GHES_ESTATUS_NODE_LEN(cper_estatus_len(estatus));
483 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, node_len);
484}
485
486static bool ghes_do_memory_failure(u64 physical_addr, int flags)
487{
488 unsigned long pfn;
489
490 if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
491 return false;
492
493 pfn = PHYS_PFN(physical_addr);
494 if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) {
495 pr_warn_ratelimited(FW_WARN GHES_PFX
496 "Invalid address in generic error data: %#llx\n",
497 physical_addr);
498 return false;
499 }
500
501 memory_failure_queue(pfn, flags);
502 return true;
503}
504
505static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata,
506 int sev, bool sync)
507{
508 int flags = -1;
509 int sec_sev = ghes_severity(gdata->error_severity);
510 struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
511
512 if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
513 return false;
514
515 /* iff following two events can be handled properly by now */
516 if (sec_sev == GHES_SEV_CORRECTED &&
517 (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
518 flags = MF_SOFT_OFFLINE;
519 if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
520 flags = sync ? MF_ACTION_REQUIRED : 0;
521
522 if (flags != -1)
523 return ghes_do_memory_failure(mem_err->physical_addr, flags);
524
525 return false;
526}
527
528static bool ghes_handle_arm_hw_error(struct acpi_hest_generic_data *gdata,
529 int sev, bool sync)
530{
531 struct cper_sec_proc_arm *err = acpi_hest_get_payload(gdata);
532 int flags = sync ? MF_ACTION_REQUIRED : 0;
533 bool queued = false;
534 int sec_sev, i;
535 char *p;
536
537 log_arm_hw_error(err);
538
539 sec_sev = ghes_severity(gdata->error_severity);
540 if (sev != GHES_SEV_RECOVERABLE || sec_sev != GHES_SEV_RECOVERABLE)
541 return false;
542
543 p = (char *)(err + 1);
544 for (i = 0; i < err->err_info_num; i++) {
545 struct cper_arm_err_info *err_info = (struct cper_arm_err_info *)p;
546 bool is_cache = (err_info->type == CPER_ARM_CACHE_ERROR);
547 bool has_pa = (err_info->validation_bits & CPER_ARM_INFO_VALID_PHYSICAL_ADDR);
548 const char *error_type = "unknown error";
549
550 /*
551 * The field (err_info->error_info & BIT(26)) is fixed to set to
552 * 1 in some old firmware of HiSilicon Kunpeng920. We assume that
553 * firmware won't mix corrected errors in an uncorrected section,
554 * and don't filter out 'corrected' error here.
555 */
556 if (is_cache && has_pa) {
557 queued = ghes_do_memory_failure(err_info->physical_fault_addr, flags);
558 p += err_info->length;
559 continue;
560 }
561
562 if (err_info->type < ARRAY_SIZE(cper_proc_error_type_strs))
563 error_type = cper_proc_error_type_strs[err_info->type];
564
565 pr_warn_ratelimited(FW_WARN GHES_PFX
566 "Unhandled processor error type: %s\n",
567 error_type);
568 p += err_info->length;
569 }
570
571 return queued;
572}
573
574/*
575 * PCIe AER errors need to be sent to the AER driver for reporting and
576 * recovery. The GHES severities map to the following AER severities and
577 * require the following handling:
578 *
579 * GHES_SEV_CORRECTABLE -> AER_CORRECTABLE
580 * These need to be reported by the AER driver but no recovery is
581 * necessary.
582 * GHES_SEV_RECOVERABLE -> AER_NONFATAL
583 * GHES_SEV_RECOVERABLE && CPER_SEC_RESET -> AER_FATAL
584 * These both need to be reported and recovered from by the AER driver.
585 * GHES_SEV_PANIC does not make it to this handling since the kernel must
586 * panic.
587 */
588static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
589{
590#ifdef CONFIG_ACPI_APEI_PCIEAER
591 struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
592
593 if (pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
594 pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
595 unsigned int devfn;
596 int aer_severity;
597 u8 *aer_info;
598
599 devfn = PCI_DEVFN(pcie_err->device_id.device,
600 pcie_err->device_id.function);
601 aer_severity = cper_severity_to_aer(gdata->error_severity);
602
603 /*
604 * If firmware reset the component to contain
605 * the error, we must reinitialize it before
606 * use, so treat it as a fatal AER error.
607 */
608 if (gdata->flags & CPER_SEC_RESET)
609 aer_severity = AER_FATAL;
610
611 aer_info = (void *)gen_pool_alloc(ghes_estatus_pool,
612 sizeof(struct aer_capability_regs));
613 if (!aer_info)
614 return;
615 memcpy(aer_info, pcie_err->aer_info, sizeof(struct aer_capability_regs));
616
617 aer_recover_queue(pcie_err->device_id.segment,
618 pcie_err->device_id.bus,
619 devfn, aer_severity,
620 (struct aer_capability_regs *)
621 aer_info);
622 }
623#endif
624}
625
626static BLOCKING_NOTIFIER_HEAD(vendor_record_notify_list);
627
628int ghes_register_vendor_record_notifier(struct notifier_block *nb)
629{
630 return blocking_notifier_chain_register(&vendor_record_notify_list, nb);
631}
632EXPORT_SYMBOL_GPL(ghes_register_vendor_record_notifier);
633
634void ghes_unregister_vendor_record_notifier(struct notifier_block *nb)
635{
636 blocking_notifier_chain_unregister(&vendor_record_notify_list, nb);
637}
638EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier);
639
640static void ghes_vendor_record_work_func(struct work_struct *work)
641{
642 struct ghes_vendor_record_entry *entry;
643 struct acpi_hest_generic_data *gdata;
644 u32 len;
645
646 entry = container_of(work, struct ghes_vendor_record_entry, work);
647 gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
648
649 blocking_notifier_call_chain(&vendor_record_notify_list,
650 entry->error_severity, gdata);
651
652 len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
653 gen_pool_free(ghes_estatus_pool, (unsigned long)entry, len);
654}
655
656static void ghes_defer_non_standard_event(struct acpi_hest_generic_data *gdata,
657 int sev)
658{
659 struct acpi_hest_generic_data *copied_gdata;
660 struct ghes_vendor_record_entry *entry;
661 u32 len;
662
663 len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
664 entry = (void *)gen_pool_alloc(ghes_estatus_pool, len);
665 if (!entry)
666 return;
667
668 copied_gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
669 memcpy(copied_gdata, gdata, acpi_hest_get_record_size(gdata));
670 entry->error_severity = sev;
671
672 INIT_WORK(&entry->work, ghes_vendor_record_work_func);
673 schedule_work(&entry->work);
674}
675
676static bool ghes_do_proc(struct ghes *ghes,
677 const struct acpi_hest_generic_status *estatus)
678{
679 int sev, sec_sev;
680 struct acpi_hest_generic_data *gdata;
681 guid_t *sec_type;
682 const guid_t *fru_id = &guid_null;
683 char *fru_text = "";
684 bool queued = false;
685 bool sync = is_hest_sync_notify(ghes);
686
687 sev = ghes_severity(estatus->error_severity);
688 apei_estatus_for_each_section(estatus, gdata) {
689 sec_type = (guid_t *)gdata->section_type;
690 sec_sev = ghes_severity(gdata->error_severity);
691 if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
692 fru_id = (guid_t *)gdata->fru_id;
693
694 if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
695 fru_text = gdata->fru_text;
696
697 if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
698 struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
699
700 atomic_notifier_call_chain(&ghes_report_chain, sev, mem_err);
701
702 arch_apei_report_mem_error(sev, mem_err);
703 queued = ghes_handle_memory_failure(gdata, sev, sync);
704 }
705 else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
706 ghes_handle_aer(gdata);
707 }
708 else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
709 queued = ghes_handle_arm_hw_error(gdata, sev, sync);
710 } else {
711 void *err = acpi_hest_get_payload(gdata);
712
713 ghes_defer_non_standard_event(gdata, sev);
714 log_non_standard_event(sec_type, fru_id, fru_text,
715 sec_sev, err,
716 gdata->error_data_length);
717 }
718 }
719
720 return queued;
721}
722
723static void __ghes_print_estatus(const char *pfx,
724 const struct acpi_hest_generic *generic,
725 const struct acpi_hest_generic_status *estatus)
726{
727 static atomic_t seqno;
728 unsigned int curr_seqno;
729 char pfx_seq[64];
730
731 if (pfx == NULL) {
732 if (ghes_severity(estatus->error_severity) <=
733 GHES_SEV_CORRECTED)
734 pfx = KERN_WARNING;
735 else
736 pfx = KERN_ERR;
737 }
738 curr_seqno = atomic_inc_return(&seqno);
739 snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
740 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
741 pfx_seq, generic->header.source_id);
742 cper_estatus_print(pfx_seq, estatus);
743}
744
745static int ghes_print_estatus(const char *pfx,
746 const struct acpi_hest_generic *generic,
747 const struct acpi_hest_generic_status *estatus)
748{
749 /* Not more than 2 messages every 5 seconds */
750 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
751 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
752 struct ratelimit_state *ratelimit;
753
754 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
755 ratelimit = &ratelimit_corrected;
756 else
757 ratelimit = &ratelimit_uncorrected;
758 if (__ratelimit(ratelimit)) {
759 __ghes_print_estatus(pfx, generic, estatus);
760 return 1;
761 }
762 return 0;
763}
764
765/*
766 * GHES error status reporting throttle, to report more kinds of
767 * errors, instead of just most frequently occurred errors.
768 */
769static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
770{
771 u32 len;
772 int i, cached = 0;
773 unsigned long long now;
774 struct ghes_estatus_cache *cache;
775 struct acpi_hest_generic_status *cache_estatus;
776
777 len = cper_estatus_len(estatus);
778 rcu_read_lock();
779 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
780 cache = rcu_dereference(ghes_estatus_caches[i]);
781 if (cache == NULL)
782 continue;
783 if (len != cache->estatus_len)
784 continue;
785 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
786 if (memcmp(estatus, cache_estatus, len))
787 continue;
788 atomic_inc(&cache->count);
789 now = sched_clock();
790 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
791 cached = 1;
792 break;
793 }
794 rcu_read_unlock();
795 return cached;
796}
797
798static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
799 struct acpi_hest_generic *generic,
800 struct acpi_hest_generic_status *estatus)
801{
802 int alloced;
803 u32 len, cache_len;
804 struct ghes_estatus_cache *cache;
805 struct acpi_hest_generic_status *cache_estatus;
806
807 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
808 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
809 atomic_dec(&ghes_estatus_cache_alloced);
810 return NULL;
811 }
812 len = cper_estatus_len(estatus);
813 cache_len = GHES_ESTATUS_CACHE_LEN(len);
814 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
815 if (!cache) {
816 atomic_dec(&ghes_estatus_cache_alloced);
817 return NULL;
818 }
819 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
820 memcpy(cache_estatus, estatus, len);
821 cache->estatus_len = len;
822 atomic_set(&cache->count, 0);
823 cache->generic = generic;
824 cache->time_in = sched_clock();
825 return cache;
826}
827
828static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
829{
830 struct ghes_estatus_cache *cache;
831 u32 len;
832
833 cache = container_of(head, struct ghes_estatus_cache, rcu);
834 len = cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
835 len = GHES_ESTATUS_CACHE_LEN(len);
836 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
837 atomic_dec(&ghes_estatus_cache_alloced);
838}
839
840static void
841ghes_estatus_cache_add(struct acpi_hest_generic *generic,
842 struct acpi_hest_generic_status *estatus)
843{
844 unsigned long long now, duration, period, max_period = 0;
845 struct ghes_estatus_cache *cache, *new_cache;
846 struct ghes_estatus_cache __rcu *victim;
847 int i, slot = -1, count;
848
849 new_cache = ghes_estatus_cache_alloc(generic, estatus);
850 if (!new_cache)
851 return;
852
853 rcu_read_lock();
854 now = sched_clock();
855 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
856 cache = rcu_dereference(ghes_estatus_caches[i]);
857 if (cache == NULL) {
858 slot = i;
859 break;
860 }
861 duration = now - cache->time_in;
862 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
863 slot = i;
864 break;
865 }
866 count = atomic_read(&cache->count);
867 period = duration;
868 do_div(period, (count + 1));
869 if (period > max_period) {
870 max_period = period;
871 slot = i;
872 }
873 }
874 rcu_read_unlock();
875
876 if (slot != -1) {
877 /*
878 * Use release semantics to ensure that ghes_estatus_cached()
879 * running on another CPU will see the updated cache fields if
880 * it can see the new value of the pointer.
881 */
882 victim = xchg_release(&ghes_estatus_caches[slot],
883 RCU_INITIALIZER(new_cache));
884
885 /*
886 * At this point, victim may point to a cached item different
887 * from the one based on which we selected the slot. Instead of
888 * going to the loop again to pick another slot, let's just
889 * drop the other item anyway: this may cause a false cache
890 * miss later on, but that won't cause any problems.
891 */
892 if (victim)
893 call_rcu(&unrcu_pointer(victim)->rcu,
894 ghes_estatus_cache_rcu_free);
895 }
896}
897
898static void __ghes_panic(struct ghes *ghes,
899 struct acpi_hest_generic_status *estatus,
900 u64 buf_paddr, enum fixed_addresses fixmap_idx)
901{
902 __ghes_print_estatus(KERN_EMERG, ghes->generic, estatus);
903
904 ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
905
906 /* reboot to log the error! */
907 if (!panic_timeout)
908 panic_timeout = ghes_panic_timeout;
909 panic("Fatal hardware error!");
910}
911
912static int ghes_proc(struct ghes *ghes)
913{
914 struct acpi_hest_generic_status *estatus = ghes->estatus;
915 u64 buf_paddr;
916 int rc;
917
918 rc = ghes_read_estatus(ghes, estatus, &buf_paddr, FIX_APEI_GHES_IRQ);
919 if (rc)
920 goto out;
921
922 if (ghes_severity(estatus->error_severity) >= GHES_SEV_PANIC)
923 __ghes_panic(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
924
925 if (!ghes_estatus_cached(estatus)) {
926 if (ghes_print_estatus(NULL, ghes->generic, estatus))
927 ghes_estatus_cache_add(ghes->generic, estatus);
928 }
929 ghes_do_proc(ghes, estatus);
930
931out:
932 ghes_clear_estatus(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
933
934 return rc;
935}
936
937static void ghes_add_timer(struct ghes *ghes)
938{
939 struct acpi_hest_generic *g = ghes->generic;
940 unsigned long expire;
941
942 if (!g->notify.poll_interval) {
943 pr_warn(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
944 g->header.source_id);
945 return;
946 }
947 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
948 ghes->timer.expires = round_jiffies_relative(expire);
949 add_timer(&ghes->timer);
950}
951
952static void ghes_poll_func(struct timer_list *t)
953{
954 struct ghes *ghes = from_timer(ghes, t, timer);
955 unsigned long flags;
956
957 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
958 ghes_proc(ghes);
959 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
960 if (!(ghes->flags & GHES_EXITING))
961 ghes_add_timer(ghes);
962}
963
964static irqreturn_t ghes_irq_func(int irq, void *data)
965{
966 struct ghes *ghes = data;
967 unsigned long flags;
968 int rc;
969
970 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
971 rc = ghes_proc(ghes);
972 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
973 if (rc)
974 return IRQ_NONE;
975
976 return IRQ_HANDLED;
977}
978
979static int ghes_notify_hed(struct notifier_block *this, unsigned long event,
980 void *data)
981{
982 struct ghes *ghes;
983 unsigned long flags;
984 int ret = NOTIFY_DONE;
985
986 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
987 rcu_read_lock();
988 list_for_each_entry_rcu(ghes, &ghes_hed, list) {
989 if (!ghes_proc(ghes))
990 ret = NOTIFY_OK;
991 }
992 rcu_read_unlock();
993 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
994
995 return ret;
996}
997
998static struct notifier_block ghes_notifier_hed = {
999 .notifier_call = ghes_notify_hed,
1000};
1001
1002/*
1003 * Handlers for CPER records may not be NMI safe. For example,
1004 * memory_failure_queue() takes spinlocks and calls schedule_work_on().
1005 * In any NMI-like handler, memory from ghes_estatus_pool is used to save
1006 * estatus, and added to the ghes_estatus_llist. irq_work_queue() causes
1007 * ghes_proc_in_irq() to run in IRQ context where each estatus in
1008 * ghes_estatus_llist is processed.
1009 *
1010 * Memory from the ghes_estatus_pool is also used with the ghes_estatus_cache
1011 * to suppress frequent messages.
1012 */
1013static struct llist_head ghes_estatus_llist;
1014static struct irq_work ghes_proc_irq_work;
1015
1016static void ghes_proc_in_irq(struct irq_work *irq_work)
1017{
1018 struct llist_node *llnode, *next;
1019 struct ghes_estatus_node *estatus_node;
1020 struct acpi_hest_generic *generic;
1021 struct acpi_hest_generic_status *estatus;
1022 bool task_work_pending;
1023 u32 len, node_len;
1024 int ret;
1025
1026 llnode = llist_del_all(&ghes_estatus_llist);
1027 /*
1028 * Because the time order of estatus in list is reversed,
1029 * revert it back to proper order.
1030 */
1031 llnode = llist_reverse_order(llnode);
1032 while (llnode) {
1033 next = llnode->next;
1034 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
1035 llnode);
1036 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
1037 len = cper_estatus_len(estatus);
1038 node_len = GHES_ESTATUS_NODE_LEN(len);
1039 task_work_pending = ghes_do_proc(estatus_node->ghes, estatus);
1040 if (!ghes_estatus_cached(estatus)) {
1041 generic = estatus_node->generic;
1042 if (ghes_print_estatus(NULL, generic, estatus))
1043 ghes_estatus_cache_add(generic, estatus);
1044 }
1045
1046 if (task_work_pending && current->mm) {
1047 estatus_node->task_work.func = ghes_kick_task_work;
1048 estatus_node->task_work_cpu = smp_processor_id();
1049 ret = task_work_add(current, &estatus_node->task_work,
1050 TWA_RESUME);
1051 if (ret)
1052 estatus_node->task_work.func = NULL;
1053 }
1054
1055 if (!estatus_node->task_work.func)
1056 gen_pool_free(ghes_estatus_pool,
1057 (unsigned long)estatus_node, node_len);
1058
1059 llnode = next;
1060 }
1061}
1062
1063static void ghes_print_queued_estatus(void)
1064{
1065 struct llist_node *llnode;
1066 struct ghes_estatus_node *estatus_node;
1067 struct acpi_hest_generic *generic;
1068 struct acpi_hest_generic_status *estatus;
1069
1070 llnode = llist_del_all(&ghes_estatus_llist);
1071 /*
1072 * Because the time order of estatus in list is reversed,
1073 * revert it back to proper order.
1074 */
1075 llnode = llist_reverse_order(llnode);
1076 while (llnode) {
1077 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
1078 llnode);
1079 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
1080 generic = estatus_node->generic;
1081 ghes_print_estatus(NULL, generic, estatus);
1082 llnode = llnode->next;
1083 }
1084}
1085
1086static int ghes_in_nmi_queue_one_entry(struct ghes *ghes,
1087 enum fixed_addresses fixmap_idx)
1088{
1089 struct acpi_hest_generic_status *estatus, tmp_header;
1090 struct ghes_estatus_node *estatus_node;
1091 u32 len, node_len;
1092 u64 buf_paddr;
1093 int sev, rc;
1094
1095 if (!IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG))
1096 return -EOPNOTSUPP;
1097
1098 rc = __ghes_peek_estatus(ghes, &tmp_header, &buf_paddr, fixmap_idx);
1099 if (rc) {
1100 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1101 return rc;
1102 }
1103
1104 rc = __ghes_check_estatus(ghes, &tmp_header);
1105 if (rc) {
1106 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1107 return rc;
1108 }
1109
1110 len = cper_estatus_len(&tmp_header);
1111 node_len = GHES_ESTATUS_NODE_LEN(len);
1112 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool, node_len);
1113 if (!estatus_node)
1114 return -ENOMEM;
1115
1116 estatus_node->ghes = ghes;
1117 estatus_node->generic = ghes->generic;
1118 estatus_node->task_work.func = NULL;
1119 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
1120
1121 if (__ghes_read_estatus(estatus, buf_paddr, fixmap_idx, len)) {
1122 ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
1123 rc = -ENOENT;
1124 goto no_work;
1125 }
1126
1127 sev = ghes_severity(estatus->error_severity);
1128 if (sev >= GHES_SEV_PANIC) {
1129 ghes_print_queued_estatus();
1130 __ghes_panic(ghes, estatus, buf_paddr, fixmap_idx);
1131 }
1132
1133 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1134
1135 /* This error has been reported before, don't process it again. */
1136 if (ghes_estatus_cached(estatus))
1137 goto no_work;
1138
1139 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
1140
1141 return rc;
1142
1143no_work:
1144 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
1145 node_len);
1146
1147 return rc;
1148}
1149
1150static int ghes_in_nmi_spool_from_list(struct list_head *rcu_list,
1151 enum fixed_addresses fixmap_idx)
1152{
1153 int ret = -ENOENT;
1154 struct ghes *ghes;
1155
1156 rcu_read_lock();
1157 list_for_each_entry_rcu(ghes, rcu_list, list) {
1158 if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx))
1159 ret = 0;
1160 }
1161 rcu_read_unlock();
1162
1163 if (IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG) && !ret)
1164 irq_work_queue(&ghes_proc_irq_work);
1165
1166 return ret;
1167}
1168
1169#ifdef CONFIG_ACPI_APEI_SEA
1170static LIST_HEAD(ghes_sea);
1171
1172/*
1173 * Return 0 only if one of the SEA error sources successfully reported an error
1174 * record sent from the firmware.
1175 */
1176int ghes_notify_sea(void)
1177{
1178 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sea);
1179 int rv;
1180
1181 raw_spin_lock(&ghes_notify_lock_sea);
1182 rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_SEA);
1183 raw_spin_unlock(&ghes_notify_lock_sea);
1184
1185 return rv;
1186}
1187
1188static void ghes_sea_add(struct ghes *ghes)
1189{
1190 mutex_lock(&ghes_list_mutex);
1191 list_add_rcu(&ghes->list, &ghes_sea);
1192 mutex_unlock(&ghes_list_mutex);
1193}
1194
1195static void ghes_sea_remove(struct ghes *ghes)
1196{
1197 mutex_lock(&ghes_list_mutex);
1198 list_del_rcu(&ghes->list);
1199 mutex_unlock(&ghes_list_mutex);
1200 synchronize_rcu();
1201}
1202#else /* CONFIG_ACPI_APEI_SEA */
1203static inline void ghes_sea_add(struct ghes *ghes) { }
1204static inline void ghes_sea_remove(struct ghes *ghes) { }
1205#endif /* CONFIG_ACPI_APEI_SEA */
1206
1207#ifdef CONFIG_HAVE_ACPI_APEI_NMI
1208/*
1209 * NMI may be triggered on any CPU, so ghes_in_nmi is used for
1210 * having only one concurrent reader.
1211 */
1212static atomic_t ghes_in_nmi = ATOMIC_INIT(0);
1213
1214static LIST_HEAD(ghes_nmi);
1215
1216static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
1217{
1218 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_nmi);
1219 int ret = NMI_DONE;
1220
1221 if (!atomic_add_unless(&ghes_in_nmi, 1, 1))
1222 return ret;
1223
1224 raw_spin_lock(&ghes_notify_lock_nmi);
1225 if (!ghes_in_nmi_spool_from_list(&ghes_nmi, FIX_APEI_GHES_NMI))
1226 ret = NMI_HANDLED;
1227 raw_spin_unlock(&ghes_notify_lock_nmi);
1228
1229 atomic_dec(&ghes_in_nmi);
1230 return ret;
1231}
1232
1233static void ghes_nmi_add(struct ghes *ghes)
1234{
1235 mutex_lock(&ghes_list_mutex);
1236 if (list_empty(&ghes_nmi))
1237 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
1238 list_add_rcu(&ghes->list, &ghes_nmi);
1239 mutex_unlock(&ghes_list_mutex);
1240}
1241
1242static void ghes_nmi_remove(struct ghes *ghes)
1243{
1244 mutex_lock(&ghes_list_mutex);
1245 list_del_rcu(&ghes->list);
1246 if (list_empty(&ghes_nmi))
1247 unregister_nmi_handler(NMI_LOCAL, "ghes");
1248 mutex_unlock(&ghes_list_mutex);
1249 /*
1250 * To synchronize with NMI handler, ghes can only be
1251 * freed after NMI handler finishes.
1252 */
1253 synchronize_rcu();
1254}
1255#else /* CONFIG_HAVE_ACPI_APEI_NMI */
1256static inline void ghes_nmi_add(struct ghes *ghes) { }
1257static inline void ghes_nmi_remove(struct ghes *ghes) { }
1258#endif /* CONFIG_HAVE_ACPI_APEI_NMI */
1259
1260static void ghes_nmi_init_cxt(void)
1261{
1262 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1263}
1264
1265static int __ghes_sdei_callback(struct ghes *ghes,
1266 enum fixed_addresses fixmap_idx)
1267{
1268 if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx)) {
1269 irq_work_queue(&ghes_proc_irq_work);
1270
1271 return 0;
1272 }
1273
1274 return -ENOENT;
1275}
1276
1277static int ghes_sdei_normal_callback(u32 event_num, struct pt_regs *regs,
1278 void *arg)
1279{
1280 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_normal);
1281 struct ghes *ghes = arg;
1282 int err;
1283
1284 raw_spin_lock(&ghes_notify_lock_sdei_normal);
1285 err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_NORMAL);
1286 raw_spin_unlock(&ghes_notify_lock_sdei_normal);
1287
1288 return err;
1289}
1290
1291static int ghes_sdei_critical_callback(u32 event_num, struct pt_regs *regs,
1292 void *arg)
1293{
1294 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_critical);
1295 struct ghes *ghes = arg;
1296 int err;
1297
1298 raw_spin_lock(&ghes_notify_lock_sdei_critical);
1299 err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_CRITICAL);
1300 raw_spin_unlock(&ghes_notify_lock_sdei_critical);
1301
1302 return err;
1303}
1304
1305static int apei_sdei_register_ghes(struct ghes *ghes)
1306{
1307 if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
1308 return -EOPNOTSUPP;
1309
1310 return sdei_register_ghes(ghes, ghes_sdei_normal_callback,
1311 ghes_sdei_critical_callback);
1312}
1313
1314static int apei_sdei_unregister_ghes(struct ghes *ghes)
1315{
1316 if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
1317 return -EOPNOTSUPP;
1318
1319 return sdei_unregister_ghes(ghes);
1320}
1321
1322static int ghes_probe(struct platform_device *ghes_dev)
1323{
1324 struct acpi_hest_generic *generic;
1325 struct ghes *ghes = NULL;
1326 unsigned long flags;
1327
1328 int rc = -EINVAL;
1329
1330 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
1331 if (!generic->enabled)
1332 return -ENODEV;
1333
1334 switch (generic->notify.type) {
1335 case ACPI_HEST_NOTIFY_POLLED:
1336 case ACPI_HEST_NOTIFY_EXTERNAL:
1337 case ACPI_HEST_NOTIFY_SCI:
1338 case ACPI_HEST_NOTIFY_GSIV:
1339 case ACPI_HEST_NOTIFY_GPIO:
1340 break;
1341
1342 case ACPI_HEST_NOTIFY_SEA:
1343 if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
1344 pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
1345 generic->header.source_id);
1346 rc = -ENOTSUPP;
1347 goto err;
1348 }
1349 break;
1350 case ACPI_HEST_NOTIFY_NMI:
1351 if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
1352 pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
1353 generic->header.source_id);
1354 goto err;
1355 }
1356 break;
1357 case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1358 if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE)) {
1359 pr_warn(GHES_PFX "Generic hardware error source: %d notified via SDE Interface is not supported!\n",
1360 generic->header.source_id);
1361 goto err;
1362 }
1363 break;
1364 case ACPI_HEST_NOTIFY_LOCAL:
1365 pr_warn(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
1366 generic->header.source_id);
1367 goto err;
1368 default:
1369 pr_warn(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
1370 generic->notify.type, generic->header.source_id);
1371 goto err;
1372 }
1373
1374 rc = -EIO;
1375 if (generic->error_block_length <
1376 sizeof(struct acpi_hest_generic_status)) {
1377 pr_warn(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
1378 generic->error_block_length, generic->header.source_id);
1379 goto err;
1380 }
1381 ghes = ghes_new(generic);
1382 if (IS_ERR(ghes)) {
1383 rc = PTR_ERR(ghes);
1384 ghes = NULL;
1385 goto err;
1386 }
1387
1388 switch (generic->notify.type) {
1389 case ACPI_HEST_NOTIFY_POLLED:
1390 timer_setup(&ghes->timer, ghes_poll_func, 0);
1391 ghes_add_timer(ghes);
1392 break;
1393 case ACPI_HEST_NOTIFY_EXTERNAL:
1394 /* External interrupt vector is GSI */
1395 rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
1396 if (rc) {
1397 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
1398 generic->header.source_id);
1399 goto err;
1400 }
1401 rc = request_irq(ghes->irq, ghes_irq_func, IRQF_SHARED,
1402 "GHES IRQ", ghes);
1403 if (rc) {
1404 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
1405 generic->header.source_id);
1406 goto err;
1407 }
1408 break;
1409
1410 case ACPI_HEST_NOTIFY_SCI:
1411 case ACPI_HEST_NOTIFY_GSIV:
1412 case ACPI_HEST_NOTIFY_GPIO:
1413 mutex_lock(&ghes_list_mutex);
1414 if (list_empty(&ghes_hed))
1415 register_acpi_hed_notifier(&ghes_notifier_hed);
1416 list_add_rcu(&ghes->list, &ghes_hed);
1417 mutex_unlock(&ghes_list_mutex);
1418 break;
1419
1420 case ACPI_HEST_NOTIFY_SEA:
1421 ghes_sea_add(ghes);
1422 break;
1423 case ACPI_HEST_NOTIFY_NMI:
1424 ghes_nmi_add(ghes);
1425 break;
1426 case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1427 rc = apei_sdei_register_ghes(ghes);
1428 if (rc)
1429 goto err;
1430 break;
1431 default:
1432 BUG();
1433 }
1434
1435 platform_set_drvdata(ghes_dev, ghes);
1436
1437 ghes->dev = &ghes_dev->dev;
1438
1439 mutex_lock(&ghes_devs_mutex);
1440 list_add_tail(&ghes->elist, &ghes_devs);
1441 mutex_unlock(&ghes_devs_mutex);
1442
1443 /* Handle any pending errors right away */
1444 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
1445 ghes_proc(ghes);
1446 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
1447
1448 return 0;
1449
1450err:
1451 if (ghes) {
1452 ghes_fini(ghes);
1453 kfree(ghes);
1454 }
1455 return rc;
1456}
1457
1458static void ghes_remove(struct platform_device *ghes_dev)
1459{
1460 int rc;
1461 struct ghes *ghes;
1462 struct acpi_hest_generic *generic;
1463
1464 ghes = platform_get_drvdata(ghes_dev);
1465 generic = ghes->generic;
1466
1467 ghes->flags |= GHES_EXITING;
1468 switch (generic->notify.type) {
1469 case ACPI_HEST_NOTIFY_POLLED:
1470 timer_shutdown_sync(&ghes->timer);
1471 break;
1472 case ACPI_HEST_NOTIFY_EXTERNAL:
1473 free_irq(ghes->irq, ghes);
1474 break;
1475
1476 case ACPI_HEST_NOTIFY_SCI:
1477 case ACPI_HEST_NOTIFY_GSIV:
1478 case ACPI_HEST_NOTIFY_GPIO:
1479 mutex_lock(&ghes_list_mutex);
1480 list_del_rcu(&ghes->list);
1481 if (list_empty(&ghes_hed))
1482 unregister_acpi_hed_notifier(&ghes_notifier_hed);
1483 mutex_unlock(&ghes_list_mutex);
1484 synchronize_rcu();
1485 break;
1486
1487 case ACPI_HEST_NOTIFY_SEA:
1488 ghes_sea_remove(ghes);
1489 break;
1490 case ACPI_HEST_NOTIFY_NMI:
1491 ghes_nmi_remove(ghes);
1492 break;
1493 case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1494 rc = apei_sdei_unregister_ghes(ghes);
1495 if (rc) {
1496 /*
1497 * Returning early results in a resource leak, but we're
1498 * only here if stopping the hardware failed.
1499 */
1500 dev_err(&ghes_dev->dev, "Failed to unregister ghes (%pe)\n",
1501 ERR_PTR(rc));
1502 return;
1503 }
1504 break;
1505 default:
1506 BUG();
1507 break;
1508 }
1509
1510 ghes_fini(ghes);
1511
1512 mutex_lock(&ghes_devs_mutex);
1513 list_del(&ghes->elist);
1514 mutex_unlock(&ghes_devs_mutex);
1515
1516 kfree(ghes);
1517}
1518
1519static struct platform_driver ghes_platform_driver = {
1520 .driver = {
1521 .name = "GHES",
1522 },
1523 .probe = ghes_probe,
1524 .remove_new = ghes_remove,
1525};
1526
1527void __init acpi_ghes_init(void)
1528{
1529 int rc;
1530
1531 sdei_init();
1532
1533 if (acpi_disabled)
1534 return;
1535
1536 switch (hest_disable) {
1537 case HEST_NOT_FOUND:
1538 return;
1539 case HEST_DISABLED:
1540 pr_info(GHES_PFX "HEST is not enabled!\n");
1541 return;
1542 default:
1543 break;
1544 }
1545
1546 if (ghes_disable) {
1547 pr_info(GHES_PFX "GHES is not enabled!\n");
1548 return;
1549 }
1550
1551 ghes_nmi_init_cxt();
1552
1553 rc = platform_driver_register(&ghes_platform_driver);
1554 if (rc)
1555 return;
1556
1557 rc = apei_osc_setup();
1558 if (rc == 0 && osc_sb_apei_support_acked)
1559 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1560 else if (rc == 0 && !osc_sb_apei_support_acked)
1561 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1562 else if (rc && osc_sb_apei_support_acked)
1563 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1564 else
1565 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1566}
1567
1568/*
1569 * Known x86 systems that prefer GHES error reporting:
1570 */
1571static struct acpi_platform_list plat_list[] = {
1572 {"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
1573 { } /* End */
1574};
1575
1576struct list_head *ghes_get_devices(void)
1577{
1578 int idx = -1;
1579
1580 if (IS_ENABLED(CONFIG_X86)) {
1581 idx = acpi_match_platform_list(plat_list);
1582 if (idx < 0) {
1583 if (!ghes_edac_force_enable)
1584 return NULL;
1585
1586 pr_warn_once("Force-loading ghes_edac on an unsupported platform. You're on your own!\n");
1587 }
1588 } else if (list_empty(&ghes_devs)) {
1589 return NULL;
1590 }
1591
1592 return &ghes_devs;
1593}
1594EXPORT_SYMBOL_GPL(ghes_get_devices);
1595
1596void ghes_register_report_chain(struct notifier_block *nb)
1597{
1598 atomic_notifier_chain_register(&ghes_report_chain, nb);
1599}
1600EXPORT_SYMBOL_GPL(ghes_register_report_chain);
1601
1602void ghes_unregister_report_chain(struct notifier_block *nb)
1603{
1604 atomic_notifier_chain_unregister(&ghes_report_chain, nb);
1605}
1606EXPORT_SYMBOL_GPL(ghes_unregister_report_chain);