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.
28 #include <linux/kernel.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/acpi.h>
33 #include <linux/interrupt.h>
34 #include <linux/timer.h>
35 #include <linux/cper.h>
36 #include <linux/kdebug.h>
37 #include <linux/platform_device.h>
38 #include <linux/mutex.h>
39 #include <linux/ratelimit.h>
40 #include <linux/vmalloc.h>
41 #include <linux/irq_work.h>
42 #include <linux/llist.h>
43 #include <linux/genalloc.h>
44 #include <linux/pci.h>
45 #include <linux/aer.h>
46 #include <linux/nmi.h>
47 #include <linux/sched/clock.h>
48 #include <linux/uuid.h>
49 #include <linux/ras.h>
51 #include <acpi/actbl1.h>
52 #include <acpi/ghes.h>
53 #include <acpi/apei.h>
54 #include <asm/fixmap.h>
55 #include <asm/tlbflush.h>
56 #include <ras/ras_event.h>
58 #include "apei-internal.h"
60 #define GHES_PFX "GHES: "
62 #define GHES_ESTATUS_MAX_SIZE 65536
63 #define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
65 #define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
67 /* This is just an estimation for memory pool allocation */
68 #define GHES_ESTATUS_CACHE_AVG_SIZE 512
70 #define GHES_ESTATUS_CACHES_SIZE 4
72 #define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
73 /* Prevent too many caches are allocated because of RCU */
74 #define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
76 #define GHES_ESTATUS_CACHE_LEN(estatus_len) \
77 (sizeof(struct ghes_estatus_cache) + (estatus_len))
78 #define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
79 ((struct acpi_hest_generic_status *) \
80 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
82 #define GHES_ESTATUS_NODE_LEN(estatus_len) \
83 (sizeof(struct ghes_estatus_node) + (estatus_len))
84 #define GHES_ESTATUS_FROM_NODE(estatus_node) \
85 ((struct acpi_hest_generic_status *) \
86 ((struct ghes_estatus_node *)(estatus_node) + 1))
88 static inline bool is_hest_type_generic_v2(struct ghes
*ghes
)
90 return ghes
->generic
->header
.type
== ACPI_HEST_TYPE_GENERIC_ERROR_V2
;
94 * This driver isn't really modular, however for the time being,
95 * continuing to use module_param is the easiest way to remain
96 * compatible with existing boot arg use cases.
99 module_param_named(disable
, ghes_disable
, bool, 0);
102 * All error sources notified with HED (Hardware Error Device) share a
103 * single notifier callback, so they need to be linked and checked one
104 * by one. This holds true for NMI too.
106 * RCU is used for these lists, so ghes_list_mutex is only used for
107 * list changing, not for traversing.
109 static LIST_HEAD(ghes_hed
);
110 static DEFINE_MUTEX(ghes_list_mutex
);
113 * Because the memory area used to transfer hardware error information
114 * from BIOS to Linux can be determined only in NMI, IRQ or timer
115 * handler, but general ioremap can not be used in atomic context, so
116 * the fixmap is used instead.
120 * Two virtual pages are used, one for IRQ/PROCESS context, the other for
121 * NMI context (optionally).
123 #define GHES_IOREMAP_PAGES 2
124 #define GHES_IOREMAP_IRQ_PAGE(base) (base)
125 #define GHES_IOREMAP_NMI_PAGE(base) ((base) + PAGE_SIZE)
127 /* virtual memory area for atomic ioremap */
128 static struct vm_struct
*ghes_ioremap_area
;
130 * These 2 spinlocks are used to prevent the fixmap entries from being used
133 static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi
);
134 static DEFINE_SPINLOCK(ghes_ioremap_lock_irq
);
136 static struct gen_pool
*ghes_estatus_pool
;
137 static unsigned long ghes_estatus_pool_size_request
;
139 static struct ghes_estatus_cache
*ghes_estatus_caches
[GHES_ESTATUS_CACHES_SIZE
];
140 static atomic_t ghes_estatus_cache_alloced
;
142 static int ghes_panic_timeout __read_mostly
= 30;
144 static int ghes_ioremap_init(void)
146 ghes_ioremap_area
= __get_vm_area(PAGE_SIZE
* GHES_IOREMAP_PAGES
,
147 VM_IOREMAP
, VMALLOC_START
, VMALLOC_END
);
148 if (!ghes_ioremap_area
) {
149 pr_err(GHES_PFX
"Failed to allocate virtual memory area for atomic ioremap.\n");
156 static void ghes_ioremap_exit(void)
158 free_vm_area(ghes_ioremap_area
);
161 static void __iomem
*ghes_ioremap_pfn_nmi(u64 pfn
)
166 paddr
= pfn
<< PAGE_SHIFT
;
167 prot
= arch_apei_get_mem_attribute(paddr
);
168 __set_fixmap(FIX_APEI_GHES_NMI
, paddr
, prot
);
170 return (void __iomem
*) fix_to_virt(FIX_APEI_GHES_NMI
);
173 static void __iomem
*ghes_ioremap_pfn_irq(u64 pfn
)
178 paddr
= pfn
<< PAGE_SHIFT
;
179 prot
= arch_apei_get_mem_attribute(paddr
);
180 __set_fixmap(FIX_APEI_GHES_IRQ
, paddr
, prot
);
182 return (void __iomem
*) fix_to_virt(FIX_APEI_GHES_IRQ
);
185 static void ghes_iounmap_nmi(void)
187 clear_fixmap(FIX_APEI_GHES_NMI
);
190 static void ghes_iounmap_irq(void)
192 clear_fixmap(FIX_APEI_GHES_IRQ
);
195 static int ghes_estatus_pool_init(void)
197 ghes_estatus_pool
= gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER
, -1);
198 if (!ghes_estatus_pool
)
203 static void ghes_estatus_pool_free_chunk_page(struct gen_pool
*pool
,
204 struct gen_pool_chunk
*chunk
,
207 free_page(chunk
->start_addr
);
210 static void ghes_estatus_pool_exit(void)
212 gen_pool_for_each_chunk(ghes_estatus_pool
,
213 ghes_estatus_pool_free_chunk_page
, NULL
);
214 gen_pool_destroy(ghes_estatus_pool
);
217 static int ghes_estatus_pool_expand(unsigned long len
)
219 unsigned long i
, pages
, size
, addr
;
222 ghes_estatus_pool_size_request
+= PAGE_ALIGN(len
);
223 size
= gen_pool_size(ghes_estatus_pool
);
224 if (size
>= ghes_estatus_pool_size_request
)
226 pages
= (ghes_estatus_pool_size_request
- size
) / PAGE_SIZE
;
227 for (i
= 0; i
< pages
; i
++) {
228 addr
= __get_free_page(GFP_KERNEL
);
231 ret
= gen_pool_add(ghes_estatus_pool
, addr
, PAGE_SIZE
, -1);
239 static int map_gen_v2(struct ghes
*ghes
)
241 return apei_map_generic_address(&ghes
->generic_v2
->read_ack_register
);
244 static void unmap_gen_v2(struct ghes
*ghes
)
246 apei_unmap_generic_address(&ghes
->generic_v2
->read_ack_register
);
249 static struct ghes
*ghes_new(struct acpi_hest_generic
*generic
)
252 unsigned int error_block_length
;
255 ghes
= kzalloc(sizeof(*ghes
), GFP_KERNEL
);
257 return ERR_PTR(-ENOMEM
);
259 ghes
->generic
= generic
;
260 if (is_hest_type_generic_v2(ghes
)) {
261 rc
= map_gen_v2(ghes
);
266 rc
= apei_map_generic_address(&generic
->error_status_address
);
268 goto err_unmap_read_ack_addr
;
269 error_block_length
= generic
->error_block_length
;
270 if (error_block_length
> GHES_ESTATUS_MAX_SIZE
) {
271 pr_warning(FW_WARN GHES_PFX
272 "Error status block length is too long: %u for "
273 "generic hardware error source: %d.\n",
274 error_block_length
, generic
->header
.source_id
);
275 error_block_length
= GHES_ESTATUS_MAX_SIZE
;
277 ghes
->estatus
= kmalloc(error_block_length
, GFP_KERNEL
);
278 if (!ghes
->estatus
) {
280 goto err_unmap_status_addr
;
285 err_unmap_status_addr
:
286 apei_unmap_generic_address(&generic
->error_status_address
);
287 err_unmap_read_ack_addr
:
288 if (is_hest_type_generic_v2(ghes
))
295 static void ghes_fini(struct ghes
*ghes
)
297 kfree(ghes
->estatus
);
298 apei_unmap_generic_address(&ghes
->generic
->error_status_address
);
299 if (is_hest_type_generic_v2(ghes
))
303 static inline int ghes_severity(int severity
)
306 case CPER_SEV_INFORMATIONAL
:
308 case CPER_SEV_CORRECTED
:
309 return GHES_SEV_CORRECTED
;
310 case CPER_SEV_RECOVERABLE
:
311 return GHES_SEV_RECOVERABLE
;
313 return GHES_SEV_PANIC
;
315 /* Unknown, go panic */
316 return GHES_SEV_PANIC
;
320 static void ghes_copy_tofrom_phys(void *buffer
, u64 paddr
, u32 len
,
324 unsigned long flags
= 0;
325 int in_nmi
= in_nmi();
330 offset
= paddr
- (paddr
& PAGE_MASK
);
332 raw_spin_lock(&ghes_ioremap_lock_nmi
);
333 vaddr
= ghes_ioremap_pfn_nmi(paddr
>> PAGE_SHIFT
);
335 spin_lock_irqsave(&ghes_ioremap_lock_irq
, flags
);
336 vaddr
= ghes_ioremap_pfn_irq(paddr
>> PAGE_SHIFT
);
338 trunk
= PAGE_SIZE
- offset
;
339 trunk
= min(trunk
, len
);
341 memcpy_fromio(buffer
, vaddr
+ offset
, trunk
);
343 memcpy_toio(vaddr
+ offset
, buffer
, trunk
);
349 raw_spin_unlock(&ghes_ioremap_lock_nmi
);
352 spin_unlock_irqrestore(&ghes_ioremap_lock_irq
, flags
);
357 static int ghes_read_estatus(struct ghes
*ghes
, int silent
)
359 struct acpi_hest_generic
*g
= ghes
->generic
;
364 rc
= apei_read(&buf_paddr
, &g
->error_status_address
);
366 if (!silent
&& printk_ratelimit())
367 pr_warning(FW_WARN GHES_PFX
368 "Failed to read error status block address for hardware error source: %d.\n",
369 g
->header
.source_id
);
375 ghes_copy_tofrom_phys(ghes
->estatus
, buf_paddr
,
376 sizeof(*ghes
->estatus
), 1);
377 if (!ghes
->estatus
->block_status
)
380 ghes
->buffer_paddr
= buf_paddr
;
381 ghes
->flags
|= GHES_TO_CLEAR
;
384 len
= cper_estatus_len(ghes
->estatus
);
385 if (len
< sizeof(*ghes
->estatus
))
387 if (len
> ghes
->generic
->error_block_length
)
389 if (cper_estatus_check_header(ghes
->estatus
))
391 ghes_copy_tofrom_phys(ghes
->estatus
+ 1,
392 buf_paddr
+ sizeof(*ghes
->estatus
),
393 len
- sizeof(*ghes
->estatus
), 1);
394 if (cper_estatus_check(ghes
->estatus
))
399 if (rc
&& !silent
&& printk_ratelimit())
400 pr_warning(FW_WARN GHES_PFX
401 "Failed to read error status block!\n");
405 static void ghes_clear_estatus(struct ghes
*ghes
)
407 ghes
->estatus
->block_status
= 0;
408 if (!(ghes
->flags
& GHES_TO_CLEAR
))
410 ghes_copy_tofrom_phys(ghes
->estatus
, ghes
->buffer_paddr
,
411 sizeof(ghes
->estatus
->block_status
), 0);
412 ghes
->flags
&= ~GHES_TO_CLEAR
;
415 static void ghes_handle_memory_failure(struct acpi_hest_generic_data
*gdata
, int sev
)
417 #ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
420 int sec_sev
= ghes_severity(gdata
->error_severity
);
421 struct cper_sec_mem_err
*mem_err
= acpi_hest_get_payload(gdata
);
423 if (!(mem_err
->validation_bits
& CPER_MEM_VALID_PA
))
426 pfn
= mem_err
->physical_addr
>> PAGE_SHIFT
;
427 if (!pfn_valid(pfn
)) {
428 pr_warn_ratelimited(FW_WARN GHES_PFX
429 "Invalid address in generic error data: %#llx\n",
430 mem_err
->physical_addr
);
434 /* iff following two events can be handled properly by now */
435 if (sec_sev
== GHES_SEV_CORRECTED
&&
436 (gdata
->flags
& CPER_SEC_ERROR_THRESHOLD_EXCEEDED
))
437 flags
= MF_SOFT_OFFLINE
;
438 if (sev
== GHES_SEV_RECOVERABLE
&& sec_sev
== GHES_SEV_RECOVERABLE
)
442 memory_failure_queue(pfn
, 0, flags
);
446 static void ghes_do_proc(struct ghes
*ghes
,
447 const struct acpi_hest_generic_status
*estatus
)
450 struct acpi_hest_generic_data
*gdata
;
452 guid_t
*fru_id
= &NULL_UUID_LE
;
455 sev
= ghes_severity(estatus
->error_severity
);
456 apei_estatus_for_each_section(estatus
, gdata
) {
457 sec_type
= (guid_t
*)gdata
->section_type
;
458 sec_sev
= ghes_severity(gdata
->error_severity
);
459 if (gdata
->validation_bits
& CPER_SEC_VALID_FRU_ID
)
460 fru_id
= (guid_t
*)gdata
->fru_id
;
462 if (gdata
->validation_bits
& CPER_SEC_VALID_FRU_TEXT
)
463 fru_text
= gdata
->fru_text
;
465 if (guid_equal(sec_type
, &CPER_SEC_PLATFORM_MEM
)) {
466 struct cper_sec_mem_err
*mem_err
= acpi_hest_get_payload(gdata
);
468 ghes_edac_report_mem_error(ghes
, sev
, mem_err
);
470 arch_apei_report_mem_error(sev
, mem_err
);
471 ghes_handle_memory_failure(gdata
, sev
);
473 #ifdef CONFIG_ACPI_APEI_PCIEAER
474 else if (guid_equal(sec_type
, &CPER_SEC_PCIE
)) {
475 struct cper_sec_pcie
*pcie_err
= acpi_hest_get_payload(gdata
);
477 if (sev
== GHES_SEV_RECOVERABLE
&&
478 sec_sev
== GHES_SEV_RECOVERABLE
&&
479 pcie_err
->validation_bits
& CPER_PCIE_VALID_DEVICE_ID
&&
480 pcie_err
->validation_bits
& CPER_PCIE_VALID_AER_INFO
) {
484 devfn
= PCI_DEVFN(pcie_err
->device_id
.device
,
485 pcie_err
->device_id
.function
);
486 aer_severity
= cper_severity_to_aer(gdata
->error_severity
);
489 * If firmware reset the component to contain
490 * the error, we must reinitialize it before
491 * use, so treat it as a fatal AER error.
493 if (gdata
->flags
& CPER_SEC_RESET
)
494 aer_severity
= AER_FATAL
;
496 aer_recover_queue(pcie_err
->device_id
.segment
,
497 pcie_err
->device_id
.bus
,
499 (struct aer_capability_regs
*)
505 else if (guid_equal(sec_type
, &CPER_SEC_PROC_ARM
)) {
506 struct cper_sec_proc_arm
*err
= acpi_hest_get_payload(gdata
);
508 log_arm_hw_error(err
);
510 void *err
= acpi_hest_get_payload(gdata
);
512 log_non_standard_event(sec_type
, fru_id
, fru_text
,
514 gdata
->error_data_length
);
519 static void __ghes_print_estatus(const char *pfx
,
520 const struct acpi_hest_generic
*generic
,
521 const struct acpi_hest_generic_status
*estatus
)
523 static atomic_t seqno
;
524 unsigned int curr_seqno
;
528 if (ghes_severity(estatus
->error_severity
) <=
534 curr_seqno
= atomic_inc_return(&seqno
);
535 snprintf(pfx_seq
, sizeof(pfx_seq
), "%s{%u}" HW_ERR
, pfx
, curr_seqno
);
536 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
537 pfx_seq
, generic
->header
.source_id
);
538 cper_estatus_print(pfx_seq
, estatus
);
541 static int ghes_print_estatus(const char *pfx
,
542 const struct acpi_hest_generic
*generic
,
543 const struct acpi_hest_generic_status
*estatus
)
545 /* Not more than 2 messages every 5 seconds */
546 static DEFINE_RATELIMIT_STATE(ratelimit_corrected
, 5*HZ
, 2);
547 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected
, 5*HZ
, 2);
548 struct ratelimit_state
*ratelimit
;
550 if (ghes_severity(estatus
->error_severity
) <= GHES_SEV_CORRECTED
)
551 ratelimit
= &ratelimit_corrected
;
553 ratelimit
= &ratelimit_uncorrected
;
554 if (__ratelimit(ratelimit
)) {
555 __ghes_print_estatus(pfx
, generic
, estatus
);
562 * GHES error status reporting throttle, to report more kinds of
563 * errors, instead of just most frequently occurred errors.
565 static int ghes_estatus_cached(struct acpi_hest_generic_status
*estatus
)
569 unsigned long long now
;
570 struct ghes_estatus_cache
*cache
;
571 struct acpi_hest_generic_status
*cache_estatus
;
573 len
= cper_estatus_len(estatus
);
575 for (i
= 0; i
< GHES_ESTATUS_CACHES_SIZE
; i
++) {
576 cache
= rcu_dereference(ghes_estatus_caches
[i
]);
579 if (len
!= cache
->estatus_len
)
581 cache_estatus
= GHES_ESTATUS_FROM_CACHE(cache
);
582 if (memcmp(estatus
, cache_estatus
, len
))
584 atomic_inc(&cache
->count
);
586 if (now
- cache
->time_in
< GHES_ESTATUS_IN_CACHE_MAX_NSEC
)
594 static struct ghes_estatus_cache
*ghes_estatus_cache_alloc(
595 struct acpi_hest_generic
*generic
,
596 struct acpi_hest_generic_status
*estatus
)
600 struct ghes_estatus_cache
*cache
;
601 struct acpi_hest_generic_status
*cache_estatus
;
603 alloced
= atomic_add_return(1, &ghes_estatus_cache_alloced
);
604 if (alloced
> GHES_ESTATUS_CACHE_ALLOCED_MAX
) {
605 atomic_dec(&ghes_estatus_cache_alloced
);
608 len
= cper_estatus_len(estatus
);
609 cache_len
= GHES_ESTATUS_CACHE_LEN(len
);
610 cache
= (void *)gen_pool_alloc(ghes_estatus_pool
, cache_len
);
612 atomic_dec(&ghes_estatus_cache_alloced
);
615 cache_estatus
= GHES_ESTATUS_FROM_CACHE(cache
);
616 memcpy(cache_estatus
, estatus
, len
);
617 cache
->estatus_len
= len
;
618 atomic_set(&cache
->count
, 0);
619 cache
->generic
= generic
;
620 cache
->time_in
= sched_clock();
624 static void ghes_estatus_cache_free(struct ghes_estatus_cache
*cache
)
628 len
= cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache
));
629 len
= GHES_ESTATUS_CACHE_LEN(len
);
630 gen_pool_free(ghes_estatus_pool
, (unsigned long)cache
, len
);
631 atomic_dec(&ghes_estatus_cache_alloced
);
634 static void ghes_estatus_cache_rcu_free(struct rcu_head
*head
)
636 struct ghes_estatus_cache
*cache
;
638 cache
= container_of(head
, struct ghes_estatus_cache
, rcu
);
639 ghes_estatus_cache_free(cache
);
642 static void ghes_estatus_cache_add(
643 struct acpi_hest_generic
*generic
,
644 struct acpi_hest_generic_status
*estatus
)
646 int i
, slot
= -1, count
;
647 unsigned long long now
, duration
, period
, max_period
= 0;
648 struct ghes_estatus_cache
*cache
, *slot_cache
= NULL
, *new_cache
;
650 new_cache
= ghes_estatus_cache_alloc(generic
, estatus
);
651 if (new_cache
== NULL
)
655 for (i
= 0; i
< GHES_ESTATUS_CACHES_SIZE
; i
++) {
656 cache
= rcu_dereference(ghes_estatus_caches
[i
]);
662 duration
= now
- cache
->time_in
;
663 if (duration
>= GHES_ESTATUS_IN_CACHE_MAX_NSEC
) {
668 count
= atomic_read(&cache
->count
);
670 do_div(period
, (count
+ 1));
671 if (period
> max_period
) {
677 /* new_cache must be put into array after its contents are written */
679 if (slot
!= -1 && cmpxchg(ghes_estatus_caches
+ slot
,
680 slot_cache
, new_cache
) == slot_cache
) {
682 call_rcu(&slot_cache
->rcu
, ghes_estatus_cache_rcu_free
);
684 ghes_estatus_cache_free(new_cache
);
688 static int ghes_ack_error(struct acpi_hest_generic_v2
*gv2
)
693 rc
= apei_read(&val
, &gv2
->read_ack_register
);
697 val
&= gv2
->read_ack_preserve
<< gv2
->read_ack_register
.bit_offset
;
698 val
|= gv2
->read_ack_write
<< gv2
->read_ack_register
.bit_offset
;
700 return apei_write(val
, &gv2
->read_ack_register
);
703 static void __ghes_panic(struct ghes
*ghes
)
705 __ghes_print_estatus(KERN_EMERG
, ghes
->generic
, ghes
->estatus
);
707 /* reboot to log the error! */
709 panic_timeout
= ghes_panic_timeout
;
710 panic("Fatal hardware error!");
713 static int ghes_proc(struct ghes
*ghes
)
717 rc
= ghes_read_estatus(ghes
, 0);
721 if (ghes_severity(ghes
->estatus
->error_severity
) >= GHES_SEV_PANIC
) {
725 if (!ghes_estatus_cached(ghes
->estatus
)) {
726 if (ghes_print_estatus(NULL
, ghes
->generic
, ghes
->estatus
))
727 ghes_estatus_cache_add(ghes
->generic
, ghes
->estatus
);
729 ghes_do_proc(ghes
, ghes
->estatus
);
732 ghes_clear_estatus(ghes
);
738 * GHESv2 type HEST entries introduce support for error acknowledgment,
739 * so only acknowledge the error if this support is present.
741 if (is_hest_type_generic_v2(ghes
))
742 return ghes_ack_error(ghes
->generic_v2
);
747 static void ghes_add_timer(struct ghes
*ghes
)
749 struct acpi_hest_generic
*g
= ghes
->generic
;
750 unsigned long expire
;
752 if (!g
->notify
.poll_interval
) {
753 pr_warning(FW_WARN GHES_PFX
"Poll interval is 0 for generic hardware error source: %d, disabled.\n",
754 g
->header
.source_id
);
757 expire
= jiffies
+ msecs_to_jiffies(g
->notify
.poll_interval
);
758 ghes
->timer
.expires
= round_jiffies_relative(expire
);
759 add_timer(&ghes
->timer
);
762 static void ghes_poll_func(unsigned long data
)
764 struct ghes
*ghes
= (void *)data
;
767 if (!(ghes
->flags
& GHES_EXITING
))
768 ghes_add_timer(ghes
);
771 static irqreturn_t
ghes_irq_func(int irq
, void *data
)
773 struct ghes
*ghes
= data
;
776 rc
= ghes_proc(ghes
);
783 static int ghes_notify_hed(struct notifier_block
*this, unsigned long event
,
787 int ret
= NOTIFY_DONE
;
790 list_for_each_entry_rcu(ghes
, &ghes_hed
, list
) {
791 if (!ghes_proc(ghes
))
799 static struct notifier_block ghes_notifier_hed
= {
800 .notifier_call
= ghes_notify_hed
,
803 #ifdef CONFIG_ACPI_APEI_SEA
804 static LIST_HEAD(ghes_sea
);
807 * Return 0 only if one of the SEA error sources successfully reported an error
808 * record sent from the firmware.
810 int ghes_notify_sea(void)
816 list_for_each_entry_rcu(ghes
, &ghes_sea
, list
) {
817 if (!ghes_proc(ghes
))
824 static void ghes_sea_add(struct ghes
*ghes
)
826 mutex_lock(&ghes_list_mutex
);
827 list_add_rcu(&ghes
->list
, &ghes_sea
);
828 mutex_unlock(&ghes_list_mutex
);
831 static void ghes_sea_remove(struct ghes
*ghes
)
833 mutex_lock(&ghes_list_mutex
);
834 list_del_rcu(&ghes
->list
);
835 mutex_unlock(&ghes_list_mutex
);
838 #else /* CONFIG_ACPI_APEI_SEA */
839 static inline void ghes_sea_add(struct ghes
*ghes
) { }
840 static inline void ghes_sea_remove(struct ghes
*ghes
) { }
841 #endif /* CONFIG_ACPI_APEI_SEA */
843 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
845 * printk is not safe in NMI context. So in NMI handler, we allocate
846 * required memory from lock-less memory allocator
847 * (ghes_estatus_pool), save estatus into it, put them into lock-less
848 * list (ghes_estatus_llist), then delay printk into IRQ context via
849 * irq_work (ghes_proc_irq_work). ghes_estatus_size_request record
850 * required pool size by all NMI error source.
852 static struct llist_head ghes_estatus_llist
;
853 static struct irq_work ghes_proc_irq_work
;
856 * NMI may be triggered on any CPU, so ghes_in_nmi is used for
857 * having only one concurrent reader.
859 static atomic_t ghes_in_nmi
= ATOMIC_INIT(0);
861 static LIST_HEAD(ghes_nmi
);
863 static void ghes_proc_in_irq(struct irq_work
*irq_work
)
865 struct llist_node
*llnode
, *next
;
866 struct ghes_estatus_node
*estatus_node
;
867 struct acpi_hest_generic
*generic
;
868 struct acpi_hest_generic_status
*estatus
;
871 llnode
= llist_del_all(&ghes_estatus_llist
);
873 * Because the time order of estatus in list is reversed,
874 * revert it back to proper order.
876 llnode
= llist_reverse_order(llnode
);
879 estatus_node
= llist_entry(llnode
, struct ghes_estatus_node
,
881 estatus
= GHES_ESTATUS_FROM_NODE(estatus_node
);
882 len
= cper_estatus_len(estatus
);
883 node_len
= GHES_ESTATUS_NODE_LEN(len
);
884 ghes_do_proc(estatus_node
->ghes
, estatus
);
885 if (!ghes_estatus_cached(estatus
)) {
886 generic
= estatus_node
->generic
;
887 if (ghes_print_estatus(NULL
, generic
, estatus
))
888 ghes_estatus_cache_add(generic
, estatus
);
890 gen_pool_free(ghes_estatus_pool
, (unsigned long)estatus_node
,
896 static void ghes_print_queued_estatus(void)
898 struct llist_node
*llnode
;
899 struct ghes_estatus_node
*estatus_node
;
900 struct acpi_hest_generic
*generic
;
901 struct acpi_hest_generic_status
*estatus
;
904 llnode
= llist_del_all(&ghes_estatus_llist
);
906 * Because the time order of estatus in list is reversed,
907 * revert it back to proper order.
909 llnode
= llist_reverse_order(llnode
);
911 estatus_node
= llist_entry(llnode
, struct ghes_estatus_node
,
913 estatus
= GHES_ESTATUS_FROM_NODE(estatus_node
);
914 len
= cper_estatus_len(estatus
);
915 node_len
= GHES_ESTATUS_NODE_LEN(len
);
916 generic
= estatus_node
->generic
;
917 ghes_print_estatus(NULL
, generic
, estatus
);
918 llnode
= llnode
->next
;
922 /* Save estatus for further processing in IRQ context */
923 static void __process_error(struct ghes
*ghes
)
925 #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
927 struct ghes_estatus_node
*estatus_node
;
928 struct acpi_hest_generic_status
*estatus
;
930 if (ghes_estatus_cached(ghes
->estatus
))
933 len
= cper_estatus_len(ghes
->estatus
);
934 node_len
= GHES_ESTATUS_NODE_LEN(len
);
936 estatus_node
= (void *)gen_pool_alloc(ghes_estatus_pool
, node_len
);
940 estatus_node
->ghes
= ghes
;
941 estatus_node
->generic
= ghes
->generic
;
942 estatus
= GHES_ESTATUS_FROM_NODE(estatus_node
);
943 memcpy(estatus
, ghes
->estatus
, len
);
944 llist_add(&estatus_node
->llnode
, &ghes_estatus_llist
);
948 static int ghes_notify_nmi(unsigned int cmd
, struct pt_regs
*regs
)
951 int sev
, ret
= NMI_DONE
;
953 if (!atomic_add_unless(&ghes_in_nmi
, 1, 1))
956 list_for_each_entry_rcu(ghes
, &ghes_nmi
, list
) {
957 if (ghes_read_estatus(ghes
, 1)) {
958 ghes_clear_estatus(ghes
);
964 sev
= ghes_severity(ghes
->estatus
->error_severity
);
965 if (sev
>= GHES_SEV_PANIC
) {
967 ghes_print_queued_estatus();
971 if (!(ghes
->flags
& GHES_TO_CLEAR
))
974 __process_error(ghes
);
975 ghes_clear_estatus(ghes
);
978 #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
979 if (ret
== NMI_HANDLED
)
980 irq_work_queue(&ghes_proc_irq_work
);
982 atomic_dec(&ghes_in_nmi
);
986 static unsigned long ghes_esource_prealloc_size(
987 const struct acpi_hest_generic
*generic
)
989 unsigned long block_length
, prealloc_records
, prealloc_size
;
991 block_length
= min_t(unsigned long, generic
->error_block_length
,
992 GHES_ESTATUS_MAX_SIZE
);
993 prealloc_records
= max_t(unsigned long,
994 generic
->records_to_preallocate
, 1);
995 prealloc_size
= min_t(unsigned long, block_length
* prealloc_records
,
996 GHES_ESOURCE_PREALLOC_MAX_SIZE
);
998 return prealloc_size
;
1001 static void ghes_estatus_pool_shrink(unsigned long len
)
1003 ghes_estatus_pool_size_request
-= PAGE_ALIGN(len
);
1006 static void ghes_nmi_add(struct ghes
*ghes
)
1010 len
= ghes_esource_prealloc_size(ghes
->generic
);
1011 ghes_estatus_pool_expand(len
);
1012 mutex_lock(&ghes_list_mutex
);
1013 if (list_empty(&ghes_nmi
))
1014 register_nmi_handler(NMI_LOCAL
, ghes_notify_nmi
, 0, "ghes");
1015 list_add_rcu(&ghes
->list
, &ghes_nmi
);
1016 mutex_unlock(&ghes_list_mutex
);
1019 static void ghes_nmi_remove(struct ghes
*ghes
)
1023 mutex_lock(&ghes_list_mutex
);
1024 list_del_rcu(&ghes
->list
);
1025 if (list_empty(&ghes_nmi
))
1026 unregister_nmi_handler(NMI_LOCAL
, "ghes");
1027 mutex_unlock(&ghes_list_mutex
);
1029 * To synchronize with NMI handler, ghes can only be
1030 * freed after NMI handler finishes.
1033 len
= ghes_esource_prealloc_size(ghes
->generic
);
1034 ghes_estatus_pool_shrink(len
);
1037 static void ghes_nmi_init_cxt(void)
1039 init_irq_work(&ghes_proc_irq_work
, ghes_proc_in_irq
);
1041 #else /* CONFIG_HAVE_ACPI_APEI_NMI */
1042 static inline void ghes_nmi_add(struct ghes
*ghes
) { }
1043 static inline void ghes_nmi_remove(struct ghes
*ghes
) { }
1044 static inline void ghes_nmi_init_cxt(void) { }
1045 #endif /* CONFIG_HAVE_ACPI_APEI_NMI */
1047 static int ghes_probe(struct platform_device
*ghes_dev
)
1049 struct acpi_hest_generic
*generic
;
1050 struct ghes
*ghes
= NULL
;
1054 generic
= *(struct acpi_hest_generic
**)ghes_dev
->dev
.platform_data
;
1055 if (!generic
->enabled
)
1058 switch (generic
->notify
.type
) {
1059 case ACPI_HEST_NOTIFY_POLLED
:
1060 case ACPI_HEST_NOTIFY_EXTERNAL
:
1061 case ACPI_HEST_NOTIFY_SCI
:
1062 case ACPI_HEST_NOTIFY_GSIV
:
1063 case ACPI_HEST_NOTIFY_GPIO
:
1066 case ACPI_HEST_NOTIFY_SEA
:
1067 if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA
)) {
1068 pr_warn(GHES_PFX
"Generic hardware error source: %d notified via SEA is not supported\n",
1069 generic
->header
.source_id
);
1074 case ACPI_HEST_NOTIFY_NMI
:
1075 if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI
)) {
1076 pr_warn(GHES_PFX
"Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
1077 generic
->header
.source_id
);
1081 case ACPI_HEST_NOTIFY_LOCAL
:
1082 pr_warning(GHES_PFX
"Generic hardware error source: %d notified via local interrupt is not supported!\n",
1083 generic
->header
.source_id
);
1086 pr_warning(FW_WARN GHES_PFX
"Unknown notification type: %u for generic hardware error source: %d\n",
1087 generic
->notify
.type
, generic
->header
.source_id
);
1092 if (generic
->error_block_length
<
1093 sizeof(struct acpi_hest_generic_status
)) {
1094 pr_warning(FW_BUG GHES_PFX
"Invalid error block length: %u for generic hardware error source: %d\n",
1095 generic
->error_block_length
,
1096 generic
->header
.source_id
);
1099 ghes
= ghes_new(generic
);
1106 rc
= ghes_edac_register(ghes
, &ghes_dev
->dev
);
1110 switch (generic
->notify
.type
) {
1111 case ACPI_HEST_NOTIFY_POLLED
:
1112 setup_deferrable_timer(&ghes
->timer
, ghes_poll_func
,
1113 (unsigned long)ghes
);
1114 ghes_add_timer(ghes
);
1116 case ACPI_HEST_NOTIFY_EXTERNAL
:
1117 /* External interrupt vector is GSI */
1118 rc
= acpi_gsi_to_irq(generic
->notify
.vector
, &ghes
->irq
);
1120 pr_err(GHES_PFX
"Failed to map GSI to IRQ for generic hardware error source: %d\n",
1121 generic
->header
.source_id
);
1122 goto err_edac_unreg
;
1124 rc
= request_irq(ghes
->irq
, ghes_irq_func
, 0, "GHES IRQ", ghes
);
1126 pr_err(GHES_PFX
"Failed to register IRQ for generic hardware error source: %d\n",
1127 generic
->header
.source_id
);
1128 goto err_edac_unreg
;
1132 case ACPI_HEST_NOTIFY_SCI
:
1133 case ACPI_HEST_NOTIFY_GSIV
:
1134 case ACPI_HEST_NOTIFY_GPIO
:
1135 mutex_lock(&ghes_list_mutex
);
1136 if (list_empty(&ghes_hed
))
1137 register_acpi_hed_notifier(&ghes_notifier_hed
);
1138 list_add_rcu(&ghes
->list
, &ghes_hed
);
1139 mutex_unlock(&ghes_list_mutex
);
1142 case ACPI_HEST_NOTIFY_SEA
:
1145 case ACPI_HEST_NOTIFY_NMI
:
1151 platform_set_drvdata(ghes_dev
, ghes
);
1153 /* Handle any pending errors right away */
1158 ghes_edac_unregister(ghes
);
1167 static int ghes_remove(struct platform_device
*ghes_dev
)
1170 struct acpi_hest_generic
*generic
;
1172 ghes
= platform_get_drvdata(ghes_dev
);
1173 generic
= ghes
->generic
;
1175 ghes
->flags
|= GHES_EXITING
;
1176 switch (generic
->notify
.type
) {
1177 case ACPI_HEST_NOTIFY_POLLED
:
1178 del_timer_sync(&ghes
->timer
);
1180 case ACPI_HEST_NOTIFY_EXTERNAL
:
1181 free_irq(ghes
->irq
, ghes
);
1184 case ACPI_HEST_NOTIFY_SCI
:
1185 case ACPI_HEST_NOTIFY_GSIV
:
1186 case ACPI_HEST_NOTIFY_GPIO
:
1187 mutex_lock(&ghes_list_mutex
);
1188 list_del_rcu(&ghes
->list
);
1189 if (list_empty(&ghes_hed
))
1190 unregister_acpi_hed_notifier(&ghes_notifier_hed
);
1191 mutex_unlock(&ghes_list_mutex
);
1195 case ACPI_HEST_NOTIFY_SEA
:
1196 ghes_sea_remove(ghes
);
1198 case ACPI_HEST_NOTIFY_NMI
:
1199 ghes_nmi_remove(ghes
);
1208 ghes_edac_unregister(ghes
);
1212 platform_set_drvdata(ghes_dev
, NULL
);
1217 static struct platform_driver ghes_platform_driver
= {
1221 .probe
= ghes_probe
,
1222 .remove
= ghes_remove
,
1225 static int __init
ghes_init(void)
1233 pr_info(GHES_PFX
"HEST is not enabled!\n");
1238 pr_info(GHES_PFX
"GHES is not enabled!\n");
1242 ghes_nmi_init_cxt();
1244 rc
= ghes_ioremap_init();
1248 rc
= ghes_estatus_pool_init();
1250 goto err_ioremap_exit
;
1252 rc
= ghes_estatus_pool_expand(GHES_ESTATUS_CACHE_AVG_SIZE
*
1253 GHES_ESTATUS_CACHE_ALLOCED_MAX
);
1257 rc
= platform_driver_register(&ghes_platform_driver
);
1261 rc
= apei_osc_setup();
1262 if (rc
== 0 && osc_sb_apei_support_acked
)
1263 pr_info(GHES_PFX
"APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1264 else if (rc
== 0 && !osc_sb_apei_support_acked
)
1265 pr_info(GHES_PFX
"APEI firmware first mode is enabled by WHEA _OSC.\n");
1266 else if (rc
&& osc_sb_apei_support_acked
)
1267 pr_info(GHES_PFX
"APEI firmware first mode is enabled by APEI bit.\n");
1269 pr_info(GHES_PFX
"Failed to enable APEI firmware first mode.\n");
1273 ghes_estatus_pool_exit();
1275 ghes_ioremap_exit();
1279 device_initcall(ghes_init
);