drivers/firmware/dmi_scan.c: fetch dmi version from SMBIOS if it exists
[linux/fpc-iii.git] / drivers / acpi / apei / ghes.c
blob7ae2750bb4571b593f6a92104beb6c2300f85095
1 /*
2 * APEI Generic Hardware Error Source support
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.
12 * For more information about Generic Hardware Error Source, please
13 * refer to ACPI Specification version 4.0, section 17.3.2.6
15 * Copyright 2010,2011 Intel Corp.
16 * Author: Huang Ying <ying.huang@intel.com>
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;
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.
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
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>
57 #include "apei-internal.h"
59 #define GHES_PFX "GHES: "
61 #define GHES_ESTATUS_MAX_SIZE 65536
62 #define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
64 #define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
66 /* This is just an estimation for memory pool allocation */
67 #define GHES_ESTATUS_CACHE_AVG_SIZE 512
69 #define GHES_ESTATUS_CACHES_SIZE 4
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)
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))
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))
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.
92 * estatus: memory buffer for error status block, allocated during
93 * HEST parsing.
95 #define GHES_TO_CLEAR 0x0001
96 #define GHES_EXITING 0x0002
98 struct 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;
110 struct ghes_estatus_node {
111 struct llist_node llnode;
112 struct acpi_hest_generic *generic;
115 struct 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;
123 bool ghes_disable;
124 module_param_named(disable, ghes_disable, bool, 0);
126 static int ghes_panic_timeout __read_mostly = 30;
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.
133 * RCU is used for these lists, so ghes_list_mutex is only used for
134 * list changing, not for traversing.
136 static LIST_HEAD(ghes_sci);
137 static LIST_HEAD(ghes_nmi);
138 static DEFINE_MUTEX(ghes_list_mutex);
141 * NMI may be triggered on any CPU, so ghes_nmi_lock is used for
142 * mutual exclusion.
144 static DEFINE_RAW_SPINLOCK(ghes_nmi_lock);
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.
154 * Two virtual pages are used, one for NMI context, the other for
155 * IRQ/PROCESS context
157 #define GHES_IOREMAP_PAGES 2
158 #define GHES_IOREMAP_NMI_PAGE(base) (base)
159 #define GHES_IOREMAP_IRQ_PAGE(base) ((base) + PAGE_SIZE)
161 /* virtual memory area for atomic ioremap */
162 static struct vm_struct *ghes_ioremap_area;
164 * These 2 spinlock is used to prevent atomic ioremap virtual memory
165 * area from being mapped simultaneously.
167 static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
168 static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
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.
178 static struct gen_pool *ghes_estatus_pool;
179 static unsigned long ghes_estatus_pool_size_request;
180 static struct llist_head ghes_estatus_llist;
181 static struct irq_work ghes_proc_irq_work;
183 struct ghes_estatus_cache *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
184 static atomic_t ghes_estatus_cache_alloced;
186 static int ghes_ioremap_init(void)
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;
195 return 0;
198 static void ghes_ioremap_exit(void)
200 free_vm_area(ghes_ioremap_area);
203 static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
205 unsigned long vaddr;
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);
211 return (void __iomem *)vaddr;
214 static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
216 unsigned long vaddr;
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);
222 return (void __iomem *)vaddr;
225 static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)
227 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
228 void *base = ghes_ioremap_area->addr;
230 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
231 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
232 __flush_tlb_one(vaddr);
235 static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
237 unsigned long vaddr = (unsigned long __force)vaddr_ptr;
238 void *base = ghes_ioremap_area->addr;
240 BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
241 unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
242 __flush_tlb_one(vaddr);
245 static int ghes_estatus_pool_init(void)
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;
253 static void ghes_estatus_pool_free_chunk_page(struct gen_pool *pool,
254 struct gen_pool_chunk *chunk,
255 void *data)
257 free_page(chunk->start_addr);
260 static void ghes_estatus_pool_exit(void)
262 gen_pool_for_each_chunk(ghes_estatus_pool,
263 ghes_estatus_pool_free_chunk_page, NULL);
264 gen_pool_destroy(ghes_estatus_pool);
267 static int ghes_estatus_pool_expand(unsigned long len)
269 unsigned long i, pages, size, addr;
270 int ret;
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;
286 return 0;
289 static void ghes_estatus_pool_shrink(unsigned long len)
291 ghes_estatus_pool_size_request -= PAGE_ALIGN(len);
294 static struct ghes *ghes_new(struct acpi_hest_generic *generic)
296 struct ghes *ghes;
297 unsigned int error_block_length;
298 int rc;
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;
315 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
316 if (!ghes->estatus) {
317 rc = -ENOMEM;
318 goto err_unmap;
321 return ghes;
323 err_unmap:
324 apei_unmap_generic_address(&generic->error_status_address);
325 err_free:
326 kfree(ghes);
327 return ERR_PTR(rc);
330 static void ghes_fini(struct ghes *ghes)
332 kfree(ghes->estatus);
333 apei_unmap_generic_address(&ghes->generic->error_status_address);
336 enum {
337 GHES_SEV_NO = 0x0,
338 GHES_SEV_CORRECTED = 0x1,
339 GHES_SEV_RECOVERABLE = 0x2,
340 GHES_SEV_PANIC = 0x3,
343 static inline int ghes_severity(int severity)
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;
360 static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
361 int from_phys)
363 void __iomem *vaddr;
364 unsigned long flags = 0;
365 int in_nmi = in_nmi();
366 u64 offset;
367 u32 trunk;
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);
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);
397 static int ghes_read_estatus(struct ghes *ghes, int silent)
399 struct acpi_hest_generic *g = ghes->generic;
400 u64 buf_paddr;
401 u32 len;
402 int rc;
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;
412 if (!buf_paddr)
413 return -ENOENT;
415 ghes_copy_tofrom_phys(ghes->estatus, buf_paddr,
416 sizeof(*ghes->estatus), 1);
417 if (!ghes->estatus->block_status)
418 return -ENOENT;
420 ghes->buffer_paddr = buf_paddr;
421 ghes->flags |= GHES_TO_CLEAR;
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;
438 err_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;
445 static void ghes_clear_estatus(struct ghes *ghes)
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;
455 static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
457 int sev, sec_sev;
458 struct acpi_hest_generic_data *gdata;
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);
479 #endif
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);
501 #endif
505 static void __ghes_print_estatus(const char *pfx,
506 const struct acpi_hest_generic *generic,
507 const struct acpi_hest_generic_status *estatus)
509 static atomic_t seqno;
510 unsigned int curr_seqno;
511 char pfx_seq[64];
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;
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);
527 static int ghes_print_estatus(const char *pfx,
528 const struct acpi_hest_generic *generic,
529 const struct acpi_hest_generic_status *estatus)
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;
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;
544 return 0;
548 * GHES error status reporting throttle, to report more kinds of
549 * errors, instead of just most frequently occurred errors.
551 static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
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;
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;
576 rcu_read_unlock();
577 return cached;
580 static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
581 struct acpi_hest_generic *generic,
582 struct acpi_hest_generic_status *estatus)
584 int alloced;
585 u32 len, cache_len;
586 struct ghes_estatus_cache *cache;
587 struct acpi_hest_generic_status *cache_estatus;
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;
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;
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;
610 static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
612 u32 len;
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);
620 static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
622 struct ghes_estatus_cache *cache;
624 cache = container_of(head, struct ghes_estatus_cache, rcu);
625 ghes_estatus_cache_free(cache);
628 static void ghes_estatus_cache_add(
629 struct acpi_hest_generic *generic,
630 struct acpi_hest_generic_status *estatus)
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;
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;
648 duration = now - cache->time_in;
649 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
650 slot = i;
651 slot_cache = cache;
652 break;
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;
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();
674 static int ghes_proc(struct ghes *ghes)
676 int rc;
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);
685 ghes_do_proc(ghes->estatus);
686 out:
687 ghes_clear_estatus(ghes);
688 return 0;
691 static void ghes_add_timer(struct ghes *ghes)
693 struct acpi_hest_generic *g = ghes->generic;
694 unsigned long expire;
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;
701 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
702 ghes->timer.expires = round_jiffies_relative(expire);
703 add_timer(&ghes->timer);
706 static void ghes_poll_func(unsigned long data)
708 struct ghes *ghes = (void *)data;
710 ghes_proc(ghes);
711 if (!(ghes->flags & GHES_EXITING))
712 ghes_add_timer(ghes);
715 static irqreturn_t ghes_irq_func(int irq, void *data)
717 struct ghes *ghes = data;
718 int rc;
720 rc = ghes_proc(ghes);
721 if (rc)
722 return IRQ_NONE;
724 return IRQ_HANDLED;
727 static int ghes_notify_sci(struct notifier_block *this,
728 unsigned long event, void *data)
730 struct ghes *ghes;
731 int ret = NOTIFY_DONE;
733 rcu_read_lock();
734 list_for_each_entry_rcu(ghes, &ghes_sci, list) {
735 if (!ghes_proc(ghes))
736 ret = NOTIFY_OK;
738 rcu_read_unlock();
740 return ret;
743 static struct llist_node *llist_nodes_reverse(struct llist_node *llnode)
745 struct llist_node *next, *tail = NULL;
747 while (llnode) {
748 next = llnode->next;
749 llnode->next = tail;
750 tail = llnode;
751 llnode = next;
754 return tail;
757 static void ghes_proc_in_irq(struct irq_work *irq_work)
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;
765 llnode = llist_del_all(&ghes_estatus_llist);
767 * Because the time order of estatus in list is reversed,
768 * revert it back to proper order.
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);
784 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
785 node_len);
786 llnode = next;
790 static void ghes_print_queued_estatus(void)
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;
798 llnode = llist_del_all(&ghes_estatus_llist);
800 * Because the time order of estatus in list is reversed,
801 * revert it back to proper order.
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;
816 static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
818 struct ghes *ghes, *ghes_global = NULL;
819 int sev, sev_global = -1;
820 int ret = NMI_DONE;
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;
828 sev = ghes_severity(ghes->estatus->error_severity);
829 if (sev > sev_global) {
830 sev_global = sev;
831 ghes_global = ghes;
833 ret = NMI_HANDLED;
836 if (ret == NMI_DONE)
837 goto out;
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!");
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);
872 next:
873 #endif
874 ghes_clear_estatus(ghes);
876 #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
877 irq_work_queue(&ghes_proc_irq_work);
878 #endif
880 out:
881 raw_spin_unlock(&ghes_nmi_lock);
882 return ret;
885 static struct notifier_block ghes_notifier_sci = {
886 .notifier_call = ghes_notify_sci,
889 static unsigned long ghes_esource_prealloc_size(
890 const struct acpi_hest_generic *generic)
892 unsigned long block_length, prealloc_records, prealloc_size;
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);
901 return prealloc_size;
904 static int ghes_probe(struct platform_device *ghes_dev)
906 struct acpi_hest_generic *generic;
907 struct ghes *ghes = NULL;
908 unsigned long len;
909 int rc = -EINVAL;
911 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
912 if (!generic->enabled)
913 return -ENODEV;
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;
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;
939 ghes = ghes_new(generic);
940 if (IS_ERR(ghes)) {
941 rc = PTR_ERR(ghes);
942 ghes = NULL;
943 goto err;
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;
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;
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();
986 platform_set_drvdata(ghes_dev, ghes);
988 return 0;
989 err:
990 if (ghes) {
991 ghes_fini(ghes);
992 kfree(ghes);
994 return rc;
997 static int ghes_remove(struct platform_device *ghes_dev)
999 struct ghes *ghes;
1000 struct acpi_hest_generic *generic;
1001 unsigned long len;
1003 ghes = platform_get_drvdata(ghes_dev);
1004 generic = ghes->generic;
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);
1028 * To synchronize with NMI handler, ghes can only be
1029 * freed after NMI handler finishes.
1031 synchronize_rcu();
1032 len = ghes_esource_prealloc_size(generic);
1033 ghes_estatus_pool_shrink(len);
1034 break;
1035 default:
1036 BUG();
1037 break;
1040 ghes_fini(ghes);
1041 kfree(ghes);
1043 platform_set_drvdata(ghes_dev, NULL);
1045 return 0;
1048 static struct platform_driver ghes_platform_driver = {
1049 .driver = {
1050 .name = "GHES",
1051 .owner = THIS_MODULE,
1053 .probe = ghes_probe,
1054 .remove = ghes_remove,
1057 static int __init ghes_init(void)
1059 int rc;
1061 if (acpi_disabled)
1062 return -ENODEV;
1064 if (hest_disable) {
1065 pr_info(GHES_PFX "HEST is not enabled!\n");
1066 return -EINVAL;
1069 if (ghes_disable) {
1070 pr_info(GHES_PFX "GHES is not enabled!\n");
1071 return -EINVAL;
1074 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1076 rc = ghes_ioremap_init();
1077 if (rc)
1078 goto err;
1080 rc = ghes_estatus_pool_init();
1081 if (rc)
1082 goto err_ioremap_exit;
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;
1089 rc = platform_driver_register(&ghes_platform_driver);
1090 if (rc)
1091 goto err_pool_exit;
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");
1103 return 0;
1104 err_pool_exit:
1105 ghes_estatus_pool_exit();
1106 err_ioremap_exit:
1107 ghes_ioremap_exit();
1108 err:
1109 return rc;
1112 static void __exit ghes_exit(void)
1114 platform_driver_unregister(&ghes_platform_driver);
1115 ghes_estatus_pool_exit();
1116 ghes_ioremap_exit();
1119 module_init(ghes_init);
1120 module_exit(ghes_exit);
1122 MODULE_AUTHOR("Huang Ying");
1123 MODULE_DESCRIPTION("APEI Generic Hardware Error Source support");
1124 MODULE_LICENSE("GPL");
1125 MODULE_ALIAS("platform:GHES");