Loading...
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/*
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/io.h>
37#include <linux/interrupt.h>
38#include <linux/timer.h>
39#include <linux/cper.h>
40#include <linux/kdebug.h>
41#include <linux/platform_device.h>
42#include <linux/mutex.h>
43#include <linux/ratelimit.h>
44#include <linux/vmalloc.h>
45#include <linux/irq_work.h>
46#include <linux/llist.h>
47#include <linux/genalloc.h>
48#include <linux/pci.h>
49#include <linux/aer.h>
50
51#include <acpi/ghes.h>
52#include <asm/mce.h>
53#include <asm/tlbflush.h>
54#include <asm/nmi.h>
55
56#include "apei-internal.h"
57
58#define GHES_PFX "GHES: "
59
60#define GHES_ESTATUS_MAX_SIZE 65536
61#define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
62
63#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
64
65/* This is just an estimation for memory pool allocation */
66#define GHES_ESTATUS_CACHE_AVG_SIZE 512
67
68#define GHES_ESTATUS_CACHES_SIZE 4
69
70#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
71/* Prevent too many caches are allocated because of RCU */
72#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
73
74#define GHES_ESTATUS_CACHE_LEN(estatus_len) \
75 (sizeof(struct ghes_estatus_cache) + (estatus_len))
76#define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
77 ((struct acpi_generic_status *) \
78 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
79
80#define GHES_ESTATUS_NODE_LEN(estatus_len) \
81 (sizeof(struct ghes_estatus_node) + (estatus_len))
82#define GHES_ESTATUS_FROM_NODE(estatus_node) \
83 ((struct acpi_generic_status *) \
84 ((struct ghes_estatus_node *)(estatus_node) + 1))
85
86bool ghes_disable;
87module_param_named(disable, ghes_disable, bool, 0);
88
89static int ghes_panic_timeout __read_mostly = 30;
90
91/*
92 * All error sources notified with SCI shares one notifier function,
93 * so they need to be linked and checked one by one. This is applied
94 * to NMI too.
95 *
96 * RCU is used for these lists, so ghes_list_mutex is only used for
97 * list changing, not for traversing.
98 */
99static LIST_HEAD(ghes_sci);
100static LIST_HEAD(ghes_nmi);
101static DEFINE_MUTEX(ghes_list_mutex);
102
103/*
104 * NMI may be triggered on any CPU, so ghes_nmi_lock is used for
105 * mutual exclusion.
106 */
107static DEFINE_RAW_SPINLOCK(ghes_nmi_lock);
108
109/*
110 * Because the memory area used to transfer hardware error information
111 * from BIOS to Linux can be determined only in NMI, IRQ or timer
112 * handler, but general ioremap can not be used in atomic context, so
113 * a special version of atomic ioremap is implemented for that.
114 */
115
116/*
117 * Two virtual pages are used, one for NMI context, the other for
118 * IRQ/PROCESS context
119 */
120#define GHES_IOREMAP_PAGES 2
121#define GHES_IOREMAP_NMI_PAGE(base) (base)
122#define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE)
123
124/* virtual memory area for atomic ioremap */
125static struct vm_struct *ghes_ioremap_area;
126/*
127 * These 2 spinlock is used to prevent atomic ioremap virtual memory
128 * area from being mapped simultaneously.
129 */
130static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
131static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
132
133/*
134 * printk is not safe in NMI context. So in NMI handler, we allocate
135 * required memory from lock-less memory allocator
136 * (ghes_estatus_pool), save estatus into it, put them into lock-less
137 * list (ghes_estatus_llist), then delay printk into IRQ context via
138 * irq_work (ghes_proc_irq_work). ghes_estatus_size_request record
139 * required pool size by all NMI error source.
140 */
141static struct gen_pool *ghes_estatus_pool;
142static unsigned long ghes_estatus_pool_size_request;
143static struct llist_head ghes_estatus_llist;
144static struct irq_work ghes_proc_irq_work;
145
146struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
147static atomic_t ghes_estatus_cache_alloced;
148
149static int ghes_ioremap_init(void)
150{
151 ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
152 VM_IOREMAP, VMALLOC_START, VMALLOC_END);
153 if (!ghes_ioremap_area) {
154 pr_err(GHES_PFX "Failed to allocate virtual memory area for atomic ioremap.\n");
155 return -ENOMEM;
156 }
157
158 return 0;
159}
160
161static void ghes_ioremap_exit(void)
162{
163 free_vm_area(ghes_ioremap_area);
164}
165
166static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
167{
168 unsigned long vaddr;
169
170 vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
171 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
172 pfn << PAGE_SHIFT, PAGE_KERNEL);
173
174 return (void __iomem *)vaddr;
175}
176
177static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
178{
179 unsigned long vaddr;
180
181 vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr);
182 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
183 pfn << PAGE_SHIFT, PAGE_KERNEL);
184
185 return (void __iomem *)vaddr;
186}
187
188static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)
189{
190 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
191 void *base = ghes_ioremap_area->addr;
192
193 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
194 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
195 __flush_tlb_one(vaddr);
196}
197
198static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
199{
200 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
201 void *base = ghes_ioremap_area->addr;
202
203 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
204 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
205 __flush_tlb_one(vaddr);
206}
207
208static int ghes_estatus_pool_init(void)
209{
210 ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
211 if (!ghes_estatus_pool)
212 return -ENOMEM;
213 return 0;
214}
215
216static void ghes_estatus_pool_free_chunk_page(struct gen_pool *pool,
217 struct gen_pool_chunk *chunk,
218 void *data)
219{
220 free_page(chunk->start_addr);
221}
222
223static void ghes_estatus_pool_exit(void)
224{
225 gen_pool_for_each_chunk(ghes_estatus_pool,
226 ghes_estatus_pool_free_chunk_page, NULL);
227 gen_pool_destroy(ghes_estatus_pool);
228}
229
230static int ghes_estatus_pool_expand(unsigned long len)
231{
232 unsigned long i, pages, size, addr;
233 int ret;
234
235 ghes_estatus_pool_size_request += PAGE_ALIGN(len);
236 size = gen_pool_size(ghes_estatus_pool);
237 if (size >= ghes_estatus_pool_size_request)
238 return 0;
239 pages = (ghes_estatus_pool_size_request - size) / PAGE_SIZE;
240 for (i = 0; i < pages; i++) {
241 addr = __get_free_page(GFP_KERNEL);
242 if (!addr)
243 return -ENOMEM;
244 ret = gen_pool_add(ghes_estatus_pool, addr, PAGE_SIZE, -1);
245 if (ret)
246 return ret;
247 }
248
249 return 0;
250}
251
252static void ghes_estatus_pool_shrink(unsigned long len)
253{
254 ghes_estatus_pool_size_request -= PAGE_ALIGN(len);
255}
256
257static struct ghes *ghes_new(struct acpi_hest_generic *generic)
258{
259 struct ghes *ghes;
260 unsigned int error_block_length;
261 int rc;
262
263 ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
264 if (!ghes)
265 return ERR_PTR(-ENOMEM);
266 ghes->generic = generic;
267 rc = apei_map_generic_address(&generic->error_status_address);
268 if (rc)
269 goto err_free;
270 error_block_length = generic->error_block_length;
271 if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
272 pr_warning(FW_WARN GHES_PFX
273 "Error status block length is too long: %u for "
274 "generic hardware error source: %d.\n",
275 error_block_length, generic->header.source_id);
276 error_block_length = GHES_ESTATUS_MAX_SIZE;
277 }
278 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
279 if (!ghes->estatus) {
280 rc = -ENOMEM;
281 goto err_unmap;
282 }
283
284 return ghes;
285
286err_unmap:
287 apei_unmap_generic_address(&generic->error_status_address);
288err_free:
289 kfree(ghes);
290 return ERR_PTR(rc);
291}
292
293static void ghes_fini(struct ghes *ghes)
294{
295 kfree(ghes->estatus);
296 apei_unmap_generic_address(&ghes->generic->error_status_address);
297}
298
299static inline int ghes_severity(int severity)
300{
301 switch (severity) {
302 case CPER_SEV_INFORMATIONAL:
303 return GHES_SEV_NO;
304 case CPER_SEV_CORRECTED:
305 return GHES_SEV_CORRECTED;
306 case CPER_SEV_RECOVERABLE:
307 return GHES_SEV_RECOVERABLE;
308 case CPER_SEV_FATAL:
309 return GHES_SEV_PANIC;
310 default:
311 /* Unknown, go panic */
312 return GHES_SEV_PANIC;
313 }
314}
315
316static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
317 int from_phys)
318{
319 void __iomem *vaddr;
320 unsigned long flags = 0;
321 int in_nmi = in_nmi();
322 u64 offset;
323 u32 trunk;
324
325 while (len > 0) {
326 offset = paddr - (paddr & PAGE_MASK);
327 if (in_nmi) {
328 raw_spin_lock(&ghes_ioremap_lock_nmi);
329 vaddr = ghes_ioremap_pfn_nmi(paddr >> PAGE_SHIFT);
330 } else {
331 spin_lock_irqsave(&ghes_ioremap_lock_irq, flags);
332 vaddr = ghes_ioremap_pfn_irq(paddr >> PAGE_SHIFT);
333 }
334 trunk = PAGE_SIZE - offset;
335 trunk = min(trunk, len);
336 if (from_phys)
337 memcpy_fromio(buffer, vaddr + offset, trunk);
338 else
339 memcpy_toio(vaddr + offset, buffer, trunk);
340 len -= trunk;
341 paddr += trunk;
342 buffer += trunk;
343 if (in_nmi) {
344 ghes_iounmap_nmi(vaddr);
345 raw_spin_unlock(&ghes_ioremap_lock_nmi);
346 } else {
347 ghes_iounmap_irq(vaddr);
348 spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags);
349 }
350 }
351}
352
353static int ghes_read_estatus(struct ghes *ghes, int silent)
354{
355 struct acpi_hest_generic *g = ghes->generic;
356 u64 buf_paddr;
357 u32 len;
358 int rc;
359
360 rc = apei_read(&buf_paddr, &g->error_status_address);
361 if (rc) {
362 if (!silent && printk_ratelimit())
363 pr_warning(FW_WARN GHES_PFX
364"Failed to read error status block address for hardware error source: %d.\n",
365 g->header.source_id);
366 return -EIO;
367 }
368 if (!buf_paddr)
369 return -ENOENT;
370
371 ghes_copy_tofrom_phys(ghes->estatus, buf_paddr,
372 sizeof(*ghes->estatus), 1);
373 if (!ghes->estatus->block_status)
374 return -ENOENT;
375
376 ghes->buffer_paddr = buf_paddr;
377 ghes->flags |= GHES_TO_CLEAR;
378
379 rc = -EIO;
380 len = cper_estatus_len(ghes->estatus);
381 if (len < sizeof(*ghes->estatus))
382 goto err_read_block;
383 if (len > ghes->generic->error_block_length)
384 goto err_read_block;
385 if (cper_estatus_check_header(ghes->estatus))
386 goto err_read_block;
387 ghes_copy_tofrom_phys(ghes->estatus + 1,
388 buf_paddr + sizeof(*ghes->estatus),
389 len - sizeof(*ghes->estatus), 1);
390 if (cper_estatus_check(ghes->estatus))
391 goto err_read_block;
392 rc = 0;
393
394err_read_block:
395 if (rc && !silent && printk_ratelimit())
396 pr_warning(FW_WARN GHES_PFX
397 "Failed to read error status block!\n");
398 return rc;
399}
400
401static void ghes_clear_estatus(struct ghes *ghes)
402{
403 ghes->estatus->block_status = 0;
404 if (!(ghes->flags & GHES_TO_CLEAR))
405 return;
406 ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr,
407 sizeof(ghes->estatus->block_status), 0);
408 ghes->flags &= ~GHES_TO_CLEAR;
409}
410
411static void ghes_handle_memory_failure(struct acpi_generic_data *gdata, int sev)
412{
413#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
414 unsigned long pfn;
415 int flags = -1;
416 int sec_sev = ghes_severity(gdata->error_severity);
417 struct cper_sec_mem_err *mem_err;
418 mem_err = (struct cper_sec_mem_err *)(gdata + 1);
419
420 if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
421 return;
422
423 pfn = mem_err->physical_addr >> PAGE_SHIFT;
424 if (!pfn_valid(pfn)) {
425 pr_warn_ratelimited(FW_WARN GHES_PFX
426 "Invalid address in generic error data: %#llx\n",
427 mem_err->physical_addr);
428 return;
429 }
430
431 /* iff following two events can be handled properly by now */
432 if (sec_sev == GHES_SEV_CORRECTED &&
433 (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
434 flags = MF_SOFT_OFFLINE;
435 if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
436 flags = 0;
437
438 if (flags != -1)
439 memory_failure_queue(pfn, 0, flags);
440#endif
441}
442
443static void ghes_do_proc(struct ghes *ghes,
444 const struct acpi_generic_status *estatus)
445{
446 int sev, sec_sev;
447 struct acpi_generic_data *gdata;
448
449 sev = ghes_severity(estatus->error_severity);
450 apei_estatus_for_each_section(estatus, gdata) {
451 sec_sev = ghes_severity(gdata->error_severity);
452 if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
453 CPER_SEC_PLATFORM_MEM)) {
454 struct cper_sec_mem_err *mem_err;
455 mem_err = (struct cper_sec_mem_err *)(gdata+1);
456 ghes_edac_report_mem_error(ghes, sev, mem_err);
457
458#ifdef CONFIG_X86_MCE
459 apei_mce_report_mem_error(sev, mem_err);
460#endif
461 ghes_handle_memory_failure(gdata, sev);
462 }
463#ifdef CONFIG_ACPI_APEI_PCIEAER
464 else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
465 CPER_SEC_PCIE)) {
466 struct cper_sec_pcie *pcie_err;
467 pcie_err = (struct cper_sec_pcie *)(gdata+1);
468 if (sev == GHES_SEV_RECOVERABLE &&
469 sec_sev == GHES_SEV_RECOVERABLE &&
470 pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
471 pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
472 unsigned int devfn;
473 int aer_severity;
474
475 devfn = PCI_DEVFN(pcie_err->device_id.device,
476 pcie_err->device_id.function);
477 aer_severity = cper_severity_to_aer(sev);
478
479 /*
480 * If firmware reset the component to contain
481 * the error, we must reinitialize it before
482 * use, so treat it as a fatal AER error.
483 */
484 if (gdata->flags & CPER_SEC_RESET)
485 aer_severity = AER_FATAL;
486
487 aer_recover_queue(pcie_err->device_id.segment,
488 pcie_err->device_id.bus,
489 devfn, aer_severity,
490 (struct aer_capability_regs *)
491 pcie_err->aer_info);
492 }
493
494 }
495#endif
496 }
497}
498
499static void __ghes_print_estatus(const char *pfx,
500 const struct acpi_hest_generic *generic,
501 const struct acpi_generic_status *estatus)
502{
503 static atomic_t seqno;
504 unsigned int curr_seqno;
505 char pfx_seq[64];
506
507 if (pfx == NULL) {
508 if (ghes_severity(estatus->error_severity) <=
509 GHES_SEV_CORRECTED)
510 pfx = KERN_WARNING;
511 else
512 pfx = KERN_ERR;
513 }
514 curr_seqno = atomic_inc_return(&seqno);
515 snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
516 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
517 pfx_seq, generic->header.source_id);
518 cper_estatus_print(pfx_seq, estatus);
519}
520
521static int ghes_print_estatus(const char *pfx,
522 const struct acpi_hest_generic *generic,
523 const struct acpi_generic_status *estatus)
524{
525 /* Not more than 2 messages every 5 seconds */
526 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
527 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
528 struct ratelimit_state *ratelimit;
529
530 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
531 ratelimit = &ratelimit_corrected;
532 else
533 ratelimit = &ratelimit_uncorrected;
534 if (__ratelimit(ratelimit)) {
535 __ghes_print_estatus(pfx, generic, estatus);
536 return 1;
537 }
538 return 0;
539}
540
541/*
542 * GHES error status reporting throttle, to report more kinds of
543 * errors, instead of just most frequently occurred errors.
544 */
545static int ghes_estatus_cached(struct acpi_generic_status *estatus)
546{
547 u32 len;
548 int i, cached = 0;
549 unsigned long long now;
550 struct ghes_estatus_cache *cache;
551 struct acpi_generic_status *cache_estatus;
552
553 len = cper_estatus_len(estatus);
554 rcu_read_lock();
555 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
556 cache = rcu_dereference(ghes_estatus_caches[i]);
557 if (cache == NULL)
558 continue;
559 if (len != cache->estatus_len)
560 continue;
561 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
562 if (memcmp(estatus, cache_estatus, len))
563 continue;
564 atomic_inc(&cache->count);
565 now = sched_clock();
566 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
567 cached = 1;
568 break;
569 }
570 rcu_read_unlock();
571 return cached;
572}
573
574static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
575 struct acpi_hest_generic *generic,
576 struct acpi_generic_status *estatus)
577{
578 int alloced;
579 u32 len, cache_len;
580 struct ghes_estatus_cache *cache;
581 struct acpi_generic_status *cache_estatus;
582
583 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
584 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
585 atomic_dec(&ghes_estatus_cache_alloced);
586 return NULL;
587 }
588 len = cper_estatus_len(estatus);
589 cache_len = GHES_ESTATUS_CACHE_LEN(len);
590 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
591 if (!cache) {
592 atomic_dec(&ghes_estatus_cache_alloced);
593 return NULL;
594 }
595 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
596 memcpy(cache_estatus, estatus, len);
597 cache->estatus_len = len;
598 atomic_set(&cache->count, 0);
599 cache->generic = generic;
600 cache->time_in = sched_clock();
601 return cache;
602}
603
604static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
605{
606 u32 len;
607
608 len = cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
609 len = GHES_ESTATUS_CACHE_LEN(len);
610 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
611 atomic_dec(&ghes_estatus_cache_alloced);
612}
613
614static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
615{
616 struct ghes_estatus_cache *cache;
617
618 cache = container_of(head, struct ghes_estatus_cache, rcu);
619 ghes_estatus_cache_free(cache);
620}
621
622static void ghes_estatus_cache_add(
623 struct acpi_hest_generic *generic,
624 struct acpi_generic_status *estatus)
625{
626 int i, slot = -1, count;
627 unsigned long long now, duration, period, max_period = 0;
628 struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
629
630 new_cache = ghes_estatus_cache_alloc(generic, estatus);
631 if (new_cache == NULL)
632 return;
633 rcu_read_lock();
634 now = sched_clock();
635 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
636 cache = rcu_dereference(ghes_estatus_caches[i]);
637 if (cache == NULL) {
638 slot = i;
639 slot_cache = NULL;
640 break;
641 }
642 duration = now - cache->time_in;
643 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
644 slot = i;
645 slot_cache = cache;
646 break;
647 }
648 count = atomic_read(&cache->count);
649 period = duration;
650 do_div(period, (count + 1));
651 if (period > max_period) {
652 max_period = period;
653 slot = i;
654 slot_cache = cache;
655 }
656 }
657 /* new_cache must be put into array after its contents are written */
658 smp_wmb();
659 if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
660 slot_cache, new_cache) == slot_cache) {
661 if (slot_cache)
662 call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
663 } else
664 ghes_estatus_cache_free(new_cache);
665 rcu_read_unlock();
666}
667
668static int ghes_proc(struct ghes *ghes)
669{
670 int rc;
671
672 rc = ghes_read_estatus(ghes, 0);
673 if (rc)
674 goto out;
675 if (!ghes_estatus_cached(ghes->estatus)) {
676 if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
677 ghes_estatus_cache_add(ghes->generic, ghes->estatus);
678 }
679 ghes_do_proc(ghes, ghes->estatus);
680out:
681 ghes_clear_estatus(ghes);
682 return 0;
683}
684
685static void ghes_add_timer(struct ghes *ghes)
686{
687 struct acpi_hest_generic *g = ghes->generic;
688 unsigned long expire;
689
690 if (!g->notify.poll_interval) {
691 pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
692 g->header.source_id);
693 return;
694 }
695 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
696 ghes->timer.expires = round_jiffies_relative(expire);
697 add_timer(&ghes->timer);
698}
699
700static void ghes_poll_func(unsigned long data)
701{
702 struct ghes *ghes = (void *)data;
703
704 ghes_proc(ghes);
705 if (!(ghes->flags & GHES_EXITING))
706 ghes_add_timer(ghes);
707}
708
709static irqreturn_t ghes_irq_func(int irq, void *data)
710{
711 struct ghes *ghes = data;
712 int rc;
713
714 rc = ghes_proc(ghes);
715 if (rc)
716 return IRQ_NONE;
717
718 return IRQ_HANDLED;
719}
720
721static int ghes_notify_sci(struct notifier_block *this,
722 unsigned long event, void *data)
723{
724 struct ghes *ghes;
725 int ret = NOTIFY_DONE;
726
727 rcu_read_lock();
728 list_for_each_entry_rcu(ghes, &ghes_sci, list) {
729 if (!ghes_proc(ghes))
730 ret = NOTIFY_OK;
731 }
732 rcu_read_unlock();
733
734 return ret;
735}
736
737static struct llist_node *llist_nodes_reverse(struct llist_node *llnode)
738{
739 struct llist_node *next, *tail = NULL;
740
741 while (llnode) {
742 next = llnode->next;
743 llnode->next = tail;
744 tail = llnode;
745 llnode = next;
746 }
747
748 return tail;
749}
750
751static void ghes_proc_in_irq(struct irq_work *irq_work)
752{
753 struct llist_node *llnode, *next;
754 struct ghes_estatus_node *estatus_node;
755 struct acpi_hest_generic *generic;
756 struct acpi_generic_status *estatus;
757 u32 len, node_len;
758
759 llnode = llist_del_all(&ghes_estatus_llist);
760 /*
761 * Because the time order of estatus in list is reversed,
762 * revert it back to proper order.
763 */
764 llnode = llist_nodes_reverse(llnode);
765 while (llnode) {
766 next = llnode->next;
767 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
768 llnode);
769 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
770 len = cper_estatus_len(estatus);
771 node_len = GHES_ESTATUS_NODE_LEN(len);
772 ghes_do_proc(estatus_node->ghes, estatus);
773 if (!ghes_estatus_cached(estatus)) {
774 generic = estatus_node->generic;
775 if (ghes_print_estatus(NULL, generic, estatus))
776 ghes_estatus_cache_add(generic, estatus);
777 }
778 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
779 node_len);
780 llnode = next;
781 }
782}
783
784static void ghes_print_queued_estatus(void)
785{
786 struct llist_node *llnode;
787 struct ghes_estatus_node *estatus_node;
788 struct acpi_hest_generic *generic;
789 struct acpi_generic_status *estatus;
790 u32 len, node_len;
791
792 llnode = llist_del_all(&ghes_estatus_llist);
793 /*
794 * Because the time order of estatus in list is reversed,
795 * revert it back to proper order.
796 */
797 llnode = llist_nodes_reverse(llnode);
798 while (llnode) {
799 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
800 llnode);
801 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
802 len = cper_estatus_len(estatus);
803 node_len = GHES_ESTATUS_NODE_LEN(len);
804 generic = estatus_node->generic;
805 ghes_print_estatus(NULL, generic, estatus);
806 llnode = llnode->next;
807 }
808}
809
810static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
811{
812 struct ghes *ghes, *ghes_global = NULL;
813 int sev, sev_global = -1;
814 int ret = NMI_DONE;
815
816 raw_spin_lock(&ghes_nmi_lock);
817 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
818 if (ghes_read_estatus(ghes, 1)) {
819 ghes_clear_estatus(ghes);
820 continue;
821 }
822 sev = ghes_severity(ghes->estatus->error_severity);
823 if (sev > sev_global) {
824 sev_global = sev;
825 ghes_global = ghes;
826 }
827 ret = NMI_HANDLED;
828 }
829
830 if (ret == NMI_DONE)
831 goto out;
832
833 if (sev_global >= GHES_SEV_PANIC) {
834 oops_begin();
835 ghes_print_queued_estatus();
836 __ghes_print_estatus(KERN_EMERG, ghes_global->generic,
837 ghes_global->estatus);
838 /* reboot to log the error! */
839 if (panic_timeout == 0)
840 panic_timeout = ghes_panic_timeout;
841 panic("Fatal hardware error!");
842 }
843
844 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
845#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
846 u32 len, node_len;
847 struct ghes_estatus_node *estatus_node;
848 struct acpi_generic_status *estatus;
849#endif
850 if (!(ghes->flags & GHES_TO_CLEAR))
851 continue;
852#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
853 if (ghes_estatus_cached(ghes->estatus))
854 goto next;
855 /* Save estatus for further processing in IRQ context */
856 len = cper_estatus_len(ghes->estatus);
857 node_len = GHES_ESTATUS_NODE_LEN(len);
858 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
859 node_len);
860 if (estatus_node) {
861 estatus_node->ghes = ghes;
862 estatus_node->generic = ghes->generic;
863 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
864 memcpy(estatus, ghes->estatus, len);
865 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
866 }
867next:
868#endif
869 ghes_clear_estatus(ghes);
870 }
871#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
872 irq_work_queue(&ghes_proc_irq_work);
873#endif
874
875out:
876 raw_spin_unlock(&ghes_nmi_lock);
877 return ret;
878}
879
880static struct notifier_block ghes_notifier_sci = {
881 .notifier_call = ghes_notify_sci,
882};
883
884static unsigned long ghes_esource_prealloc_size(
885 const struct acpi_hest_generic *generic)
886{
887 unsigned long block_length, prealloc_records, prealloc_size;
888
889 block_length = min_t(unsigned long, generic->error_block_length,
890 GHES_ESTATUS_MAX_SIZE);
891 prealloc_records = max_t(unsigned long,
892 generic->records_to_preallocate, 1);
893 prealloc_size = min_t(unsigned long, block_length * prealloc_records,
894 GHES_ESOURCE_PREALLOC_MAX_SIZE);
895
896 return prealloc_size;
897}
898
899static int ghes_probe(struct platform_device *ghes_dev)
900{
901 struct acpi_hest_generic *generic;
902 struct ghes *ghes = NULL;
903 unsigned long len;
904 int rc = -EINVAL;
905
906 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
907 if (!generic->enabled)
908 return -ENODEV;
909
910 switch (generic->notify.type) {
911 case ACPI_HEST_NOTIFY_POLLED:
912 case ACPI_HEST_NOTIFY_EXTERNAL:
913 case ACPI_HEST_NOTIFY_SCI:
914 case ACPI_HEST_NOTIFY_NMI:
915 break;
916 case ACPI_HEST_NOTIFY_LOCAL:
917 pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
918 generic->header.source_id);
919 goto err;
920 default:
921 pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
922 generic->notify.type, generic->header.source_id);
923 goto err;
924 }
925
926 rc = -EIO;
927 if (generic->error_block_length <
928 sizeof(struct acpi_generic_status)) {
929 pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
930 generic->error_block_length,
931 generic->header.source_id);
932 goto err;
933 }
934 ghes = ghes_new(generic);
935 if (IS_ERR(ghes)) {
936 rc = PTR_ERR(ghes);
937 ghes = NULL;
938 goto err;
939 }
940
941 rc = ghes_edac_register(ghes, &ghes_dev->dev);
942 if (rc < 0)
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 rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
955 if (rc) {
956 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
957 generic->header.source_id);
958 goto err_edac_unreg;
959 }
960 rc = request_irq(ghes->irq, ghes_irq_func, 0, "GHES IRQ", ghes);
961 if (rc) {
962 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
963 generic->header.source_id);
964 goto err_edac_unreg;
965 }
966 break;
967 case ACPI_HEST_NOTIFY_SCI:
968 mutex_lock(&ghes_list_mutex);
969 if (list_empty(&ghes_sci))
970 register_acpi_hed_notifier(&ghes_notifier_sci);
971 list_add_rcu(&ghes->list, &ghes_sci);
972 mutex_unlock(&ghes_list_mutex);
973 break;
974 case ACPI_HEST_NOTIFY_NMI:
975 len = ghes_esource_prealloc_size(generic);
976 ghes_estatus_pool_expand(len);
977 mutex_lock(&ghes_list_mutex);
978 if (list_empty(&ghes_nmi))
979 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0,
980 "ghes");
981 list_add_rcu(&ghes->list, &ghes_nmi);
982 mutex_unlock(&ghes_list_mutex);
983 break;
984 default:
985 BUG();
986 }
987 platform_set_drvdata(ghes_dev, ghes);
988
989 return 0;
990err_edac_unreg:
991 ghes_edac_unregister(ghes);
992err:
993 if (ghes) {
994 ghes_fini(ghes);
995 kfree(ghes);
996 }
997 return rc;
998}
999
1000static int ghes_remove(struct platform_device *ghes_dev)
1001{
1002 struct ghes *ghes;
1003 struct acpi_hest_generic *generic;
1004 unsigned long len;
1005
1006 ghes = platform_get_drvdata(ghes_dev);
1007 generic = ghes->generic;
1008
1009 ghes->flags |= GHES_EXITING;
1010 switch (generic->notify.type) {
1011 case ACPI_HEST_NOTIFY_POLLED:
1012 del_timer_sync(&ghes->timer);
1013 break;
1014 case ACPI_HEST_NOTIFY_EXTERNAL:
1015 free_irq(ghes->irq, ghes);
1016 break;
1017 case ACPI_HEST_NOTIFY_SCI:
1018 mutex_lock(&ghes_list_mutex);
1019 list_del_rcu(&ghes->list);
1020 if (list_empty(&ghes_sci))
1021 unregister_acpi_hed_notifier(&ghes_notifier_sci);
1022 mutex_unlock(&ghes_list_mutex);
1023 break;
1024 case ACPI_HEST_NOTIFY_NMI:
1025 mutex_lock(&ghes_list_mutex);
1026 list_del_rcu(&ghes->list);
1027 if (list_empty(&ghes_nmi))
1028 unregister_nmi_handler(NMI_LOCAL, "ghes");
1029 mutex_unlock(&ghes_list_mutex);
1030 /*
1031 * To synchronize with NMI handler, ghes can only be
1032 * freed after NMI handler finishes.
1033 */
1034 synchronize_rcu();
1035 len = ghes_esource_prealloc_size(generic);
1036 ghes_estatus_pool_shrink(len);
1037 break;
1038 default:
1039 BUG();
1040 break;
1041 }
1042
1043 ghes_fini(ghes);
1044
1045 ghes_edac_unregister(ghes);
1046
1047 kfree(ghes);
1048
1049 platform_set_drvdata(ghes_dev, NULL);
1050
1051 return 0;
1052}
1053
1054static struct platform_driver ghes_platform_driver = {
1055 .driver = {
1056 .name = "GHES",
1057 .owner = THIS_MODULE,
1058 },
1059 .probe = ghes_probe,
1060 .remove = ghes_remove,
1061};
1062
1063static int __init ghes_init(void)
1064{
1065 int rc;
1066
1067 if (acpi_disabled)
1068 return -ENODEV;
1069
1070 if (hest_disable) {
1071 pr_info(GHES_PFX "HEST is not enabled!\n");
1072 return -EINVAL;
1073 }
1074
1075 if (ghes_disable) {
1076 pr_info(GHES_PFX "GHES is not enabled!\n");
1077 return -EINVAL;
1078 }
1079
1080 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1081
1082 rc = ghes_ioremap_init();
1083 if (rc)
1084 goto err;
1085
1086 rc = ghes_estatus_pool_init();
1087 if (rc)
1088 goto err_ioremap_exit;
1089
1090 rc = ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
1091 GHES_ESTATUS_CACHE_ALLOCED_MAX);
1092 if (rc)
1093 goto err_pool_exit;
1094
1095 rc = platform_driver_register(&ghes_platform_driver);
1096 if (rc)
1097 goto err_pool_exit;
1098
1099 rc = apei_osc_setup();
1100 if (rc == 0 && osc_sb_apei_support_acked)
1101 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1102 else if (rc == 0 && !osc_sb_apei_support_acked)
1103 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1104 else if (rc && osc_sb_apei_support_acked)
1105 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1106 else
1107 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1108
1109 return 0;
1110err_pool_exit:
1111 ghes_estatus_pool_exit();
1112err_ioremap_exit:
1113 ghes_ioremap_exit();
1114err:
1115 return rc;
1116}
1117
1118static void __exit ghes_exit(void)
1119{
1120 platform_driver_unregister(&ghes_platform_driver);
1121 ghes_estatus_pool_exit();
1122 ghes_ioremap_exit();
1123}
1124
1125module_init(ghes_init);
1126module_exit(ghes_exit);
1127
1128MODULE_AUTHOR("Huang Ying");
1129MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1130MODULE_LICENSE("GPL");
1131MODULE_ALIAS("platform:GHES");