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 <acpi/apei.h>
49#include <acpi/atomicio.h>
50#include <acpi/hed.h>
51#include <asm/mce.h>
52#include <asm/tlbflush.h>
53
54#include "apei-internal.h"
55
56#define GHES_PFX "GHES: "
57
58#define GHES_ESTATUS_MAX_SIZE 65536
59#define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
60
61#define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
62
63/* This is just an estimation for memory pool allocation */
64#define GHES_ESTATUS_CACHE_AVG_SIZE 512
65
66#define GHES_ESTATUS_CACHES_SIZE 4
67
68#define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
69/* Prevent too many caches are allocated because of RCU */
70#define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
71
72#define GHES_ESTATUS_CACHE_LEN(estatus_len) \
73 (sizeof(struct ghes_estatus_cache) + (estatus_len))
74#define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
75 ((struct acpi_hest_generic_status *) \
76 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
77
78#define GHES_ESTATUS_NODE_LEN(estatus_len) \
79 (sizeof(struct ghes_estatus_node) + (estatus_len))
80#define GHES_ESTATUS_FROM_NODE(estatus_node) \
81 ((struct acpi_hest_generic_status *) \
82 ((struct ghes_estatus_node *)(estatus_node) + 1))
83
84/*
85 * One struct ghes is created for each generic hardware error source.
86 * It provides the context for APEI hardware error timer/IRQ/SCI/NMI
87 * handler.
88 *
89 * estatus: memory buffer for error status block, allocated during
90 * HEST parsing.
91 */
92#define GHES_TO_CLEAR 0x0001
93#define GHES_EXITING 0x0002
94
95struct ghes {
96 struct acpi_hest_generic *generic;
97 struct acpi_hest_generic_status *estatus;
98 u64 buffer_paddr;
99 unsigned long flags;
100 union {
101 struct list_head list;
102 struct timer_list timer;
103 unsigned int irq;
104 };
105};
106
107struct ghes_estatus_node {
108 struct llist_node llnode;
109 struct acpi_hest_generic *generic;
110};
111
112struct ghes_estatus_cache {
113 u32 estatus_len;
114 atomic_t count;
115 struct acpi_hest_generic *generic;
116 unsigned long long time_in;
117 struct rcu_head rcu;
118};
119
120int ghes_disable;
121module_param_named(disable, ghes_disable, bool, 0);
122
123static int ghes_panic_timeout __read_mostly = 30;
124
125/*
126 * All error sources notified with SCI shares one notifier function,
127 * so they need to be linked and checked one by one. This is applied
128 * to NMI too.
129 *
130 * RCU is used for these lists, so ghes_list_mutex is only used for
131 * list changing, not for traversing.
132 */
133static LIST_HEAD(ghes_sci);
134static LIST_HEAD(ghes_nmi);
135static DEFINE_MUTEX(ghes_list_mutex);
136
137/*
138 * NMI may be triggered on any CPU, so ghes_nmi_lock is used for
139 * mutual exclusion.
140 */
141static DEFINE_RAW_SPINLOCK(ghes_nmi_lock);
142
143/*
144 * Because the memory area used to transfer hardware error information
145 * from BIOS to Linux can be determined only in NMI, IRQ or timer
146 * handler, but general ioremap can not be used in atomic context, so
147 * a special version of atomic ioremap is implemented for that.
148 */
149
150/*
151 * Two virtual pages are used, one for NMI context, the other for
152 * IRQ/PROCESS context
153 */
154#define GHES_IOREMAP_PAGES 2
155#define GHES_IOREMAP_NMI_PAGE(base) (base)
156#define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE)
157
158/* virtual memory area for atomic ioremap */
159static struct vm_struct *ghes_ioremap_area;
160/*
161 * These 2 spinlock is used to prevent atomic ioremap virtual memory
162 * area from being mapped simultaneously.
163 */
164static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
165static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
166
167/*
168 * printk is not safe in NMI context. So in NMI handler, we allocate
169 * required memory from lock-less memory allocator
170 * (ghes_estatus_pool), save estatus into it, put them into lock-less
171 * list (ghes_estatus_llist), then delay printk into IRQ context via
172 * irq_work (ghes_proc_irq_work). ghes_estatus_size_request record
173 * required pool size by all NMI error source.
174 */
175static struct gen_pool *ghes_estatus_pool;
176static unsigned long ghes_estatus_pool_size_request;
177static struct llist_head ghes_estatus_llist;
178static struct irq_work ghes_proc_irq_work;
179
180struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
181static atomic_t ghes_estatus_cache_alloced;
182
183static int ghes_ioremap_init(void)
184{
185 ghes_ioremap_area = __get_vm_area(PAGE_SIZE * GHES_IOREMAP_PAGES,
186 VM_IOREMAP, VMALLOC_START, VMALLOC_END);
187 if (!ghes_ioremap_area) {
188 pr_err(GHES_PFX "Failed to allocate virtual memory area for atomic ioremap.\n");
189 return -ENOMEM;
190 }
191
192 return 0;
193}
194
195static void ghes_ioremap_exit(void)
196{
197 free_vm_area(ghes_ioremap_area);
198}
199
200static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
201{
202 unsigned long vaddr;
203
204 vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
205 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
206 pfn << PAGE_SHIFT, PAGE_KERNEL);
207
208 return (void __iomem *)vaddr;
209}
210
211static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
212{
213 unsigned long vaddr;
214
215 vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr);
216 ioremap_page_range(vaddr, vaddr + PAGE_SIZE,
217 pfn << PAGE_SHIFT, PAGE_KERNEL);
218
219 return (void __iomem *)vaddr;
220}
221
222static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)
223{
224 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
225 void *base = ghes_ioremap_area->addr;
226
227 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
228 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
229 __flush_tlb_one(vaddr);
230}
231
232static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
233{
234 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
235 void *base = ghes_ioremap_area->addr;
236
237 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
238 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
239 __flush_tlb_one(vaddr);
240}
241
242static int ghes_estatus_pool_init(void)
243{
244 ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
245 if (!ghes_estatus_pool)
246 return -ENOMEM;
247 return 0;
248}
249
250static void ghes_estatus_pool_free_chunk_page(struct gen_pool *pool,
251 struct gen_pool_chunk *chunk,
252 void *data)
253{
254 free_page(chunk->start_addr);
255}
256
257static void ghes_estatus_pool_exit(void)
258{
259 gen_pool_for_each_chunk(ghes_estatus_pool,
260 ghes_estatus_pool_free_chunk_page, NULL);
261 gen_pool_destroy(ghes_estatus_pool);
262}
263
264static int ghes_estatus_pool_expand(unsigned long len)
265{
266 unsigned long i, pages, size, addr;
267 int ret;
268
269 ghes_estatus_pool_size_request += PAGE_ALIGN(len);
270 size = gen_pool_size(ghes_estatus_pool);
271 if (size >= ghes_estatus_pool_size_request)
272 return 0;
273 pages = (ghes_estatus_pool_size_request - size) / PAGE_SIZE;
274 for (i = 0; i < pages; i++) {
275 addr = __get_free_page(GFP_KERNEL);
276 if (!addr)
277 return -ENOMEM;
278 ret = gen_pool_add(ghes_estatus_pool, addr, PAGE_SIZE, -1);
279 if (ret)
280 return ret;
281 }
282
283 return 0;
284}
285
286static void ghes_estatus_pool_shrink(unsigned long len)
287{
288 ghes_estatus_pool_size_request -= PAGE_ALIGN(len);
289}
290
291static struct ghes *ghes_new(struct acpi_hest_generic *generic)
292{
293 struct ghes *ghes;
294 unsigned int error_block_length;
295 int rc;
296
297 ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
298 if (!ghes)
299 return ERR_PTR(-ENOMEM);
300 ghes->generic = generic;
301 rc = acpi_pre_map_gar(&generic->error_status_address);
302 if (rc)
303 goto err_free;
304 error_block_length = generic->error_block_length;
305 if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
306 pr_warning(FW_WARN GHES_PFX
307 "Error status block length is too long: %u for "
308 "generic hardware error source: %d.\n",
309 error_block_length, generic->header.source_id);
310 error_block_length = GHES_ESTATUS_MAX_SIZE;
311 }
312 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
313 if (!ghes->estatus) {
314 rc = -ENOMEM;
315 goto err_unmap;
316 }
317
318 return ghes;
319
320err_unmap:
321 acpi_post_unmap_gar(&generic->error_status_address);
322err_free:
323 kfree(ghes);
324 return ERR_PTR(rc);
325}
326
327static void ghes_fini(struct ghes *ghes)
328{
329 kfree(ghes->estatus);
330 acpi_post_unmap_gar(&ghes->generic->error_status_address);
331}
332
333enum {
334 GHES_SEV_NO = 0x0,
335 GHES_SEV_CORRECTED = 0x1,
336 GHES_SEV_RECOVERABLE = 0x2,
337 GHES_SEV_PANIC = 0x3,
338};
339
340static inline int ghes_severity(int severity)
341{
342 switch (severity) {
343 case CPER_SEV_INFORMATIONAL:
344 return GHES_SEV_NO;
345 case CPER_SEV_CORRECTED:
346 return GHES_SEV_CORRECTED;
347 case CPER_SEV_RECOVERABLE:
348 return GHES_SEV_RECOVERABLE;
349 case CPER_SEV_FATAL:
350 return GHES_SEV_PANIC;
351 default:
352 /* Unknown, go panic */
353 return GHES_SEV_PANIC;
354 }
355}
356
357static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
358 int from_phys)
359{
360 void __iomem *vaddr;
361 unsigned long flags = 0;
362 int in_nmi = in_nmi();
363 u64 offset;
364 u32 trunk;
365
366 while (len > 0) {
367 offset = paddr - (paddr & PAGE_MASK);
368 if (in_nmi) {
369 raw_spin_lock(&ghes_ioremap_lock_nmi);
370 vaddr = ghes_ioremap_pfn_nmi(paddr >> PAGE_SHIFT);
371 } else {
372 spin_lock_irqsave(&ghes_ioremap_lock_irq, flags);
373 vaddr = ghes_ioremap_pfn_irq(paddr >> PAGE_SHIFT);
374 }
375 trunk = PAGE_SIZE - offset;
376 trunk = min(trunk, len);
377 if (from_phys)
378 memcpy_fromio(buffer, vaddr + offset, trunk);
379 else
380 memcpy_toio(vaddr + offset, buffer, trunk);
381 len -= trunk;
382 paddr += trunk;
383 buffer += trunk;
384 if (in_nmi) {
385 ghes_iounmap_nmi(vaddr);
386 raw_spin_unlock(&ghes_ioremap_lock_nmi);
387 } else {
388 ghes_iounmap_irq(vaddr);
389 spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags);
390 }
391 }
392}
393
394static int ghes_read_estatus(struct ghes *ghes, int silent)
395{
396 struct acpi_hest_generic *g = ghes->generic;
397 u64 buf_paddr;
398 u32 len;
399 int rc;
400
401 rc = acpi_atomic_read(&buf_paddr, &g->error_status_address);
402 if (rc) {
403 if (!silent && printk_ratelimit())
404 pr_warning(FW_WARN GHES_PFX
405"Failed to read error status block address for hardware error source: %d.\n",
406 g->header.source_id);
407 return -EIO;
408 }
409 if (!buf_paddr)
410 return -ENOENT;
411
412 ghes_copy_tofrom_phys(ghes->estatus, buf_paddr,
413 sizeof(*ghes->estatus), 1);
414 if (!ghes->estatus->block_status)
415 return -ENOENT;
416
417 ghes->buffer_paddr = buf_paddr;
418 ghes->flags |= GHES_TO_CLEAR;
419
420 rc = -EIO;
421 len = apei_estatus_len(ghes->estatus);
422 if (len < sizeof(*ghes->estatus))
423 goto err_read_block;
424 if (len > ghes->generic->error_block_length)
425 goto err_read_block;
426 if (apei_estatus_check_header(ghes->estatus))
427 goto err_read_block;
428 ghes_copy_tofrom_phys(ghes->estatus + 1,
429 buf_paddr + sizeof(*ghes->estatus),
430 len - sizeof(*ghes->estatus), 1);
431 if (apei_estatus_check(ghes->estatus))
432 goto err_read_block;
433 rc = 0;
434
435err_read_block:
436 if (rc && !silent && printk_ratelimit())
437 pr_warning(FW_WARN GHES_PFX
438 "Failed to read error status block!\n");
439 return rc;
440}
441
442static void ghes_clear_estatus(struct ghes *ghes)
443{
444 ghes->estatus->block_status = 0;
445 if (!(ghes->flags & GHES_TO_CLEAR))
446 return;
447 ghes_copy_tofrom_phys(ghes->estatus, ghes->buffer_paddr,
448 sizeof(ghes->estatus->block_status), 0);
449 ghes->flags &= ~GHES_TO_CLEAR;
450}
451
452static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
453{
454 int sev, sec_sev;
455 struct acpi_hest_generic_data *gdata;
456
457 sev = ghes_severity(estatus->error_severity);
458 apei_estatus_for_each_section(estatus, gdata) {
459 sec_sev = ghes_severity(gdata->error_severity);
460 if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
461 CPER_SEC_PLATFORM_MEM)) {
462 struct cper_sec_mem_err *mem_err;
463 mem_err = (struct cper_sec_mem_err *)(gdata+1);
464#ifdef CONFIG_X86_MCE
465 apei_mce_report_mem_error(sev == GHES_SEV_CORRECTED,
466 mem_err);
467#endif
468#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
469 if (sev == GHES_SEV_RECOVERABLE &&
470 sec_sev == GHES_SEV_RECOVERABLE &&
471 mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS) {
472 unsigned long pfn;
473 pfn = mem_err->physical_addr >> PAGE_SHIFT;
474 memory_failure_queue(pfn, 0, 0);
475 }
476#endif
477 }
478 }
479}
480
481static void __ghes_print_estatus(const char *pfx,
482 const struct acpi_hest_generic *generic,
483 const struct acpi_hest_generic_status *estatus)
484{
485 if (pfx == NULL) {
486 if (ghes_severity(estatus->error_severity) <=
487 GHES_SEV_CORRECTED)
488 pfx = KERN_WARNING HW_ERR;
489 else
490 pfx = KERN_ERR HW_ERR;
491 }
492 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
493 pfx, generic->header.source_id);
494 apei_estatus_print(pfx, estatus);
495}
496
497static int ghes_print_estatus(const char *pfx,
498 const struct acpi_hest_generic *generic,
499 const struct acpi_hest_generic_status *estatus)
500{
501 /* Not more than 2 messages every 5 seconds */
502 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
503 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
504 struct ratelimit_state *ratelimit;
505
506 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
507 ratelimit = &ratelimit_corrected;
508 else
509 ratelimit = &ratelimit_uncorrected;
510 if (__ratelimit(ratelimit)) {
511 __ghes_print_estatus(pfx, generic, estatus);
512 return 1;
513 }
514 return 0;
515}
516
517/*
518 * GHES error status reporting throttle, to report more kinds of
519 * errors, instead of just most frequently occurred errors.
520 */
521static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
522{
523 u32 len;
524 int i, cached = 0;
525 unsigned long long now;
526 struct ghes_estatus_cache *cache;
527 struct acpi_hest_generic_status *cache_estatus;
528
529 len = apei_estatus_len(estatus);
530 rcu_read_lock();
531 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
532 cache = rcu_dereference(ghes_estatus_caches[i]);
533 if (cache == NULL)
534 continue;
535 if (len != cache->estatus_len)
536 continue;
537 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
538 if (memcmp(estatus, cache_estatus, len))
539 continue;
540 atomic_inc(&cache->count);
541 now = sched_clock();
542 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
543 cached = 1;
544 break;
545 }
546 rcu_read_unlock();
547 return cached;
548}
549
550static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
551 struct acpi_hest_generic *generic,
552 struct acpi_hest_generic_status *estatus)
553{
554 int alloced;
555 u32 len, cache_len;
556 struct ghes_estatus_cache *cache;
557 struct acpi_hest_generic_status *cache_estatus;
558
559 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
560 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
561 atomic_dec(&ghes_estatus_cache_alloced);
562 return NULL;
563 }
564 len = apei_estatus_len(estatus);
565 cache_len = GHES_ESTATUS_CACHE_LEN(len);
566 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
567 if (!cache) {
568 atomic_dec(&ghes_estatus_cache_alloced);
569 return NULL;
570 }
571 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
572 memcpy(cache_estatus, estatus, len);
573 cache->estatus_len = len;
574 atomic_set(&cache->count, 0);
575 cache->generic = generic;
576 cache->time_in = sched_clock();
577 return cache;
578}
579
580static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
581{
582 u32 len;
583
584 len = apei_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
585 len = GHES_ESTATUS_CACHE_LEN(len);
586 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
587 atomic_dec(&ghes_estatus_cache_alloced);
588}
589
590static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
591{
592 struct ghes_estatus_cache *cache;
593
594 cache = container_of(head, struct ghes_estatus_cache, rcu);
595 ghes_estatus_cache_free(cache);
596}
597
598static void ghes_estatus_cache_add(
599 struct acpi_hest_generic *generic,
600 struct acpi_hest_generic_status *estatus)
601{
602 int i, slot = -1, count;
603 unsigned long long now, duration, period, max_period = 0;
604 struct ghes_estatus_cache *cache, *slot_cache = NULL, *new_cache;
605
606 new_cache = ghes_estatus_cache_alloc(generic, estatus);
607 if (new_cache == NULL)
608 return;
609 rcu_read_lock();
610 now = sched_clock();
611 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
612 cache = rcu_dereference(ghes_estatus_caches[i]);
613 if (cache == NULL) {
614 slot = i;
615 slot_cache = NULL;
616 break;
617 }
618 duration = now - cache->time_in;
619 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
620 slot = i;
621 slot_cache = cache;
622 break;
623 }
624 count = atomic_read(&cache->count);
625 period = duration;
626 do_div(period, (count + 1));
627 if (period > max_period) {
628 max_period = period;
629 slot = i;
630 slot_cache = cache;
631 }
632 }
633 /* new_cache must be put into array after its contents are written */
634 smp_wmb();
635 if (slot != -1 && cmpxchg(ghes_estatus_caches + slot,
636 slot_cache, new_cache) == slot_cache) {
637 if (slot_cache)
638 call_rcu(&slot_cache->rcu, ghes_estatus_cache_rcu_free);
639 } else
640 ghes_estatus_cache_free(new_cache);
641 rcu_read_unlock();
642}
643
644static int ghes_proc(struct ghes *ghes)
645{
646 int rc;
647
648 rc = ghes_read_estatus(ghes, 0);
649 if (rc)
650 goto out;
651 if (!ghes_estatus_cached(ghes->estatus)) {
652 if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
653 ghes_estatus_cache_add(ghes->generic, ghes->estatus);
654 }
655 ghes_do_proc(ghes->estatus);
656out:
657 ghes_clear_estatus(ghes);
658 return 0;
659}
660
661static void ghes_add_timer(struct ghes *ghes)
662{
663 struct acpi_hest_generic *g = ghes->generic;
664 unsigned long expire;
665
666 if (!g->notify.poll_interval) {
667 pr_warning(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
668 g->header.source_id);
669 return;
670 }
671 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
672 ghes->timer.expires = round_jiffies_relative(expire);
673 add_timer(&ghes->timer);
674}
675
676static void ghes_poll_func(unsigned long data)
677{
678 struct ghes *ghes = (void *)data;
679
680 ghes_proc(ghes);
681 if (!(ghes->flags & GHES_EXITING))
682 ghes_add_timer(ghes);
683}
684
685static irqreturn_t ghes_irq_func(int irq, void *data)
686{
687 struct ghes *ghes = data;
688 int rc;
689
690 rc = ghes_proc(ghes);
691 if (rc)
692 return IRQ_NONE;
693
694 return IRQ_HANDLED;
695}
696
697static int ghes_notify_sci(struct notifier_block *this,
698 unsigned long event, void *data)
699{
700 struct ghes *ghes;
701 int ret = NOTIFY_DONE;
702
703 rcu_read_lock();
704 list_for_each_entry_rcu(ghes, &ghes_sci, list) {
705 if (!ghes_proc(ghes))
706 ret = NOTIFY_OK;
707 }
708 rcu_read_unlock();
709
710 return ret;
711}
712
713static void ghes_proc_in_irq(struct irq_work *irq_work)
714{
715 struct llist_node *llnode, *next, *tail = NULL;
716 struct ghes_estatus_node *estatus_node;
717 struct acpi_hest_generic *generic;
718 struct acpi_hest_generic_status *estatus;
719 u32 len, node_len;
720
721 /*
722 * Because the time order of estatus in list is reversed,
723 * revert it back to proper order.
724 */
725 llnode = llist_del_all(&ghes_estatus_llist);
726 while (llnode) {
727 next = llnode->next;
728 llnode->next = tail;
729 tail = llnode;
730 llnode = next;
731 }
732 llnode = tail;
733 while (llnode) {
734 next = llnode->next;
735 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
736 llnode);
737 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
738 len = apei_estatus_len(estatus);
739 node_len = GHES_ESTATUS_NODE_LEN(len);
740 ghes_do_proc(estatus);
741 if (!ghes_estatus_cached(estatus)) {
742 generic = estatus_node->generic;
743 if (ghes_print_estatus(NULL, generic, estatus))
744 ghes_estatus_cache_add(generic, estatus);
745 }
746 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
747 node_len);
748 llnode = next;
749 }
750}
751
752static int ghes_notify_nmi(struct notifier_block *this,
753 unsigned long cmd, void *data)
754{
755 struct ghes *ghes, *ghes_global = NULL;
756 int sev, sev_global = -1;
757 int ret = NOTIFY_DONE;
758
759 if (cmd != DIE_NMI)
760 return ret;
761
762 raw_spin_lock(&ghes_nmi_lock);
763 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
764 if (ghes_read_estatus(ghes, 1)) {
765 ghes_clear_estatus(ghes);
766 continue;
767 }
768 sev = ghes_severity(ghes->estatus->error_severity);
769 if (sev > sev_global) {
770 sev_global = sev;
771 ghes_global = ghes;
772 }
773 ret = NOTIFY_STOP;
774 }
775
776 if (ret == NOTIFY_DONE)
777 goto out;
778
779 if (sev_global >= GHES_SEV_PANIC) {
780 oops_begin();
781 __ghes_print_estatus(KERN_EMERG HW_ERR, ghes_global->generic,
782 ghes_global->estatus);
783 /* reboot to log the error! */
784 if (panic_timeout == 0)
785 panic_timeout = ghes_panic_timeout;
786 panic("Fatal hardware error!");
787 }
788
789 list_for_each_entry_rcu(ghes, &ghes_nmi, list) {
790#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
791 u32 len, node_len;
792 struct ghes_estatus_node *estatus_node;
793 struct acpi_hest_generic_status *estatus;
794#endif
795 if (!(ghes->flags & GHES_TO_CLEAR))
796 continue;
797#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
798 if (ghes_estatus_cached(ghes->estatus))
799 goto next;
800 /* Save estatus for further processing in IRQ context */
801 len = apei_estatus_len(ghes->estatus);
802 node_len = GHES_ESTATUS_NODE_LEN(len);
803 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
804 node_len);
805 if (estatus_node) {
806 estatus_node->generic = ghes->generic;
807 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
808 memcpy(estatus, ghes->estatus, len);
809 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
810 }
811next:
812#endif
813 ghes_clear_estatus(ghes);
814 }
815#ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
816 irq_work_queue(&ghes_proc_irq_work);
817#endif
818
819out:
820 raw_spin_unlock(&ghes_nmi_lock);
821 return ret;
822}
823
824static struct notifier_block ghes_notifier_sci = {
825 .notifier_call = ghes_notify_sci,
826};
827
828static struct notifier_block ghes_notifier_nmi = {
829 .notifier_call = ghes_notify_nmi,
830};
831
832static unsigned long ghes_esource_prealloc_size(
833 const struct acpi_hest_generic *generic)
834{
835 unsigned long block_length, prealloc_records, prealloc_size;
836
837 block_length = min_t(unsigned long, generic->error_block_length,
838 GHES_ESTATUS_MAX_SIZE);
839 prealloc_records = max_t(unsigned long,
840 generic->records_to_preallocate, 1);
841 prealloc_size = min_t(unsigned long, block_length * prealloc_records,
842 GHES_ESOURCE_PREALLOC_MAX_SIZE);
843
844 return prealloc_size;
845}
846
847static int __devinit ghes_probe(struct platform_device *ghes_dev)
848{
849 struct acpi_hest_generic *generic;
850 struct ghes *ghes = NULL;
851 unsigned long len;
852 int rc = -EINVAL;
853
854 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
855 if (!generic->enabled)
856 return -ENODEV;
857
858 switch (generic->notify.type) {
859 case ACPI_HEST_NOTIFY_POLLED:
860 case ACPI_HEST_NOTIFY_EXTERNAL:
861 case ACPI_HEST_NOTIFY_SCI:
862 case ACPI_HEST_NOTIFY_NMI:
863 break;
864 case ACPI_HEST_NOTIFY_LOCAL:
865 pr_warning(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
866 generic->header.source_id);
867 goto err;
868 default:
869 pr_warning(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
870 generic->notify.type, generic->header.source_id);
871 goto err;
872 }
873
874 rc = -EIO;
875 if (generic->error_block_length <
876 sizeof(struct acpi_hest_generic_status)) {
877 pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
878 generic->error_block_length,
879 generic->header.source_id);
880 goto err;
881 }
882 ghes = ghes_new(generic);
883 if (IS_ERR(ghes)) {
884 rc = PTR_ERR(ghes);
885 ghes = NULL;
886 goto err;
887 }
888 switch (generic->notify.type) {
889 case ACPI_HEST_NOTIFY_POLLED:
890 ghes->timer.function = ghes_poll_func;
891 ghes->timer.data = (unsigned long)ghes;
892 init_timer_deferrable(&ghes->timer);
893 ghes_add_timer(ghes);
894 break;
895 case ACPI_HEST_NOTIFY_EXTERNAL:
896 /* External interrupt vector is GSI */
897 if (acpi_gsi_to_irq(generic->notify.vector, &ghes->irq)) {
898 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
899 generic->header.source_id);
900 goto err;
901 }
902 if (request_irq(ghes->irq, ghes_irq_func,
903 0, "GHES IRQ", ghes)) {
904 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
905 generic->header.source_id);
906 goto err;
907 }
908 break;
909 case ACPI_HEST_NOTIFY_SCI:
910 mutex_lock(&ghes_list_mutex);
911 if (list_empty(&ghes_sci))
912 register_acpi_hed_notifier(&ghes_notifier_sci);
913 list_add_rcu(&ghes->list, &ghes_sci);
914 mutex_unlock(&ghes_list_mutex);
915 break;
916 case ACPI_HEST_NOTIFY_NMI:
917 len = ghes_esource_prealloc_size(generic);
918 ghes_estatus_pool_expand(len);
919 mutex_lock(&ghes_list_mutex);
920 if (list_empty(&ghes_nmi))
921 register_die_notifier(&ghes_notifier_nmi);
922 list_add_rcu(&ghes->list, &ghes_nmi);
923 mutex_unlock(&ghes_list_mutex);
924 break;
925 default:
926 BUG();
927 }
928 platform_set_drvdata(ghes_dev, ghes);
929
930 return 0;
931err:
932 if (ghes) {
933 ghes_fini(ghes);
934 kfree(ghes);
935 }
936 return rc;
937}
938
939static int __devexit ghes_remove(struct platform_device *ghes_dev)
940{
941 struct ghes *ghes;
942 struct acpi_hest_generic *generic;
943 unsigned long len;
944
945 ghes = platform_get_drvdata(ghes_dev);
946 generic = ghes->generic;
947
948 ghes->flags |= GHES_EXITING;
949 switch (generic->notify.type) {
950 case ACPI_HEST_NOTIFY_POLLED:
951 del_timer_sync(&ghes->timer);
952 break;
953 case ACPI_HEST_NOTIFY_EXTERNAL:
954 free_irq(ghes->irq, ghes);
955 break;
956 case ACPI_HEST_NOTIFY_SCI:
957 mutex_lock(&ghes_list_mutex);
958 list_del_rcu(&ghes->list);
959 if (list_empty(&ghes_sci))
960 unregister_acpi_hed_notifier(&ghes_notifier_sci);
961 mutex_unlock(&ghes_list_mutex);
962 break;
963 case ACPI_HEST_NOTIFY_NMI:
964 mutex_lock(&ghes_list_mutex);
965 list_del_rcu(&ghes->list);
966 if (list_empty(&ghes_nmi))
967 unregister_die_notifier(&ghes_notifier_nmi);
968 mutex_unlock(&ghes_list_mutex);
969 /*
970 * To synchronize with NMI handler, ghes can only be
971 * freed after NMI handler finishes.
972 */
973 synchronize_rcu();
974 len = ghes_esource_prealloc_size(generic);
975 ghes_estatus_pool_shrink(len);
976 break;
977 default:
978 BUG();
979 break;
980 }
981
982 ghes_fini(ghes);
983 kfree(ghes);
984
985 platform_set_drvdata(ghes_dev, NULL);
986
987 return 0;
988}
989
990static struct platform_driver ghes_platform_driver = {
991 .driver = {
992 .name = "GHES",
993 .owner = THIS_MODULE,
994 },
995 .probe = ghes_probe,
996 .remove = ghes_remove,
997};
998
999static int __init ghes_init(void)
1000{
1001 int rc;
1002
1003 if (acpi_disabled)
1004 return -ENODEV;
1005
1006 if (hest_disable) {
1007 pr_info(GHES_PFX "HEST is not enabled!\n");
1008 return -EINVAL;
1009 }
1010
1011 if (ghes_disable) {
1012 pr_info(GHES_PFX "GHES is not enabled!\n");
1013 return -EINVAL;
1014 }
1015
1016 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1017
1018 rc = ghes_ioremap_init();
1019 if (rc)
1020 goto err;
1021
1022 rc = ghes_estatus_pool_init();
1023 if (rc)
1024 goto err_ioremap_exit;
1025
1026 rc = ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE *
1027 GHES_ESTATUS_CACHE_ALLOCED_MAX);
1028 if (rc)
1029 goto err_pool_exit;
1030
1031 rc = platform_driver_register(&ghes_platform_driver);
1032 if (rc)
1033 goto err_pool_exit;
1034
1035 rc = apei_osc_setup();
1036 if (rc == 0 && osc_sb_apei_support_acked)
1037 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1038 else if (rc == 0 && !osc_sb_apei_support_acked)
1039 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1040 else if (rc && osc_sb_apei_support_acked)
1041 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1042 else
1043 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1044
1045 return 0;
1046err_pool_exit:
1047 ghes_estatus_pool_exit();
1048err_ioremap_exit:
1049 ghes_ioremap_exit();
1050err:
1051 return rc;
1052}
1053
1054static void __exit ghes_exit(void)
1055{
1056 platform_driver_unregister(&ghes_platform_driver);
1057 ghes_estatus_pool_exit();
1058 ghes_ioremap_exit();
1059}
1060
1061module_init(ghes_init);
1062module_exit(ghes_exit);
1063
1064MODULE_AUTHOR("Huang Ying");
1065MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1066MODULE_LICENSE("GPL");
1067MODULE_ALIAS("platform:GHES");